Showing papers on "Electromagnetic brake published in 2009"

Stormproof billboard and control method thereof

Abstract: The present invention relates to an stormproof billboard and control method thereof, which includes a column, a billboard stent, a rotating element, a motor, an electromagnetic brake, an anemoscope, a trigger switch, and an electric control assembly, wherein the control element respectively connects with the electromagnetic brake, the motor and the trigger switch, the electric control assembly controls the work of the motor and the electromagnetic brake by the wind speed signal measured by the anemoscope and the signal of the trigger switch. By using above structure, the invention can change the windward section of the stormproof billboard by the wind speed and the wind direction, such that effectively reduces the wind load, makes the stormproof billboard more secure in use. The invention is easy to control and secure to use, makes the advertisement have a good effect, it is worth to use the stormproof billboard.

Electromagnetic Brake Effects on the Funnel Shape Mold of a Thin Slab Caster Based on a New Type Magnet

Abstract: In the present work, a new type of magnet specially designed for the thin slab casting funnel shape mold is developed. The unique feature of the new type of magnet lies in the fact that, the inner surfaces of the new magnet facing the mold are irregular to fit the complex funnel shape, while the inner surfaces of the convential magnet are planar. Magnetic fields produced by both the new type and the conventional magnets are computed under the same number of ampere turns for comparison. Keeping the position of the magnet relative to the mold fixed, numerical simulations of the influence of the new and conventional type magnets on the flow field in the mold are made. The commercial software FLUENT is used to predict the behavior of electrically conducting fluid flow under the influence of static magnetic fields. For the computation of magnetic fields, the finite element method (FEM) is adopted, while for fluid flow, the finite volume method (FVM) based on structured body fitted coordinate grids is used. The results show that the new type of magnet can produce larger magnetic flux density in the mold region than the conventional one does with the same current intensity. For the funnel shape mold, the electromagnetic brake (EMBr) due to the new magnet can provide a more uniform downstream velocity profile than that due to the conventional magnet, and almost 40 pct reduction in ampere turns; this fact implies that a lot of electrical energy could be saved.

Thin type hoisting machine and driving motor for thin type hoisting machine

Abstract: PROBLEM TO BE SOLVED: To provide a thin type hoisting machine capable of being applied as one for an elevator without a machine room for braking an outer peripheral surface of a brake drum and being miniaturized by utilizing an efficient output of an electromagnetic brake device. SOLUTION: In external shape and dimension of the electromagnetic brake device 6 on an upper side of a body 1 of equipment, of the electromagnetic brake devices 6 oppositely installed at two upper and lower portions, thickness (axial direction thickness) is made smaller than that of the whole of the hoising machine, and a width Lw of a direction between two traveling parts 20a and 20b of a rope 20 to be a width direction is made smaller than a distance between the traveling parts 20a and 20b (which is substantially the same as a diameter of a sheave 2). The electromagnetic brake device 6 is capable of exerting high output efficiency, while maintaining the output level and being compactly constituted, since the electromagnetic brake device 6 has the cross-sectional shape close to a square and does not become slender. COPYRIGHT: (C)2011,JPO&INPIT

Method for operation of a fuel injection system

Abstract: The invention relates to a method for operation of a fuel injection system wherein fuel enters at least one combustion chamber of the internal combustion engine from an electromagnetically actuated injection valve (1) and wherein the movement of a valve element (3) influences said injection valve (1) at least temporarily by an electromagnetic brake impulse (16). A closing delay time of said injection valve (1) or a corresponding measurement is determined and the determined closing delay time or the corresponding measurement is used to determine at least one parameter of said brake impulse (16).

Method and apparatus for electromagnetically braking a motor

Abstract: An electromagnetic braking system and method is provided for selectively braking a motor using an electromagnetic brake having an electromagnet, a permanent magnet, a rotor assembly, and a brake pad. The brake assembly applies when the electromagnet is de-energized and releases when the electromagnet is energized. When applied the permanent magnet moves the brake pad into frictional engagement with a housing, and when released the electromagnet cancels the flux of the permanent magnet to allow a leaf spring to move the brake pad away from the housing. A controller has a DC/DC converter for converting a main bus voltage to a lower braking voltage based on certain parameters. The converter utilizes pulse-width modulation (PWM) to regulate the braking voltage. A calibrated gap is defined between the brake pad and permanent magnet when the brake assembly is released, and may be dynamically modified via the controller.

Vehicle machine controlled belt tension system and method to control belt tension

Abstract: A vehicle machine with a belt system and a belt. The belt system includes a tensioner with a tensioner moving member which is movably supported on a tensioner stationary member; a tensioner pulley which is rotatably supported on the tensioner moving member and around which at least a portion of the belt is engaged. The belt system includes a bias member, the bias member biasing the tensioner moving member with the tensioner pulley pressing the belt. The belt system includes a controllable electrical current supply and an electromagnetic brake lock, the electromagnetic brake lock including a brake lock electromagnetic coil and a brake lock magnetic target, the electromagnetic brake lock disposed between the tensioner moving member and the tensioner stationary member wherein a controlled current supplied from the controllable electrical current supply to the brake lock electromagnetic coil inhibits the tensioner moving member from moving relative to the tensioner stationary member.

Brake device of wind power generator

Abstract: The utility model relates to a brake apparatus of an aerogenerator. An electromagnetic brake mechanism is arranged between a rotating shaft of the aerogenerator and a stander of the aerogenerator or a housing. The tail end of the rotating shaft of the aerogenerator extends out of the housing; an additional suction-closing type electromagnetic brake mechanism is arranged between the extended tail end plane of the rotating shaft and the tail end plane of the housing; the suction-closing type electromagnetic brake mechanism sucks the friction between the planes for closing, thus reducing the speed of the rotating shaft and stopping the rotating shaft. A rubbing surface is arranged outside the housing, and because the mechanism is generally used under the over-strong wind, the heat produced between the rubbing surfaces can be dissipated quickly. The working time of an electromagnetic block can be controlled by the temperature inside a generator or a current inductor; when the temperature or the current is satisfied with the designed requirement, the electromagnetic block stops running and releases a brake piece, so that the aerogenerator can continue to work. The brake apparatus has the advantages of simple structure, high reliability and low cost.

Flow, Solidification, and Solute Transport in a Continuous Casting Mold with Electromagnetic Brake

Abstract: A three-dimensional mathematical model is developed to study coupled turbulent flow, heat, solute transport, and solidification in a slab continuous caster with electromagnetic brake. Based on the analogy analysis, all the governing equations can be expressed as a general differential equation and be solved by a general numerical method. Numerical results show that a small corner-vortex appears near the free surface due to the interaction between the moving solidified shell and the upward flow. Influenced by the fluid flow, the temperature and solute distribution can also be divided into the upper and lower recirculation zones but the distribution of carbon concentration is opposite to that of temperature. The three-dimensional magnetic field can effectively damp the local flow and affect heat and solute transfer in the mold.

Operational sense imparting type input device

Abstract: PROBLEM TO BE SOLVED: To provide an operational sense imparting type input device which can generate a high rotating resistance with a lower power and further can generate self-sustaining torque. SOLUTION: An operational sense imparting type input device 10 includes: an operational section 12 which is rotated and operated; photointerrupters 18, 19 which detect the rotation state of the operational section 12; an armature rotor 22 which rotates together with the operational section 12; an electromagnetic brake 24 which applies rotating resistance to the operational section 12 via the armature rotor 22; and an electric motor 30 which separately from the electromagnetic brake 24, applies self-sustained torque to the operational section 12 via a rotational axis 14. A control section 28 can drive only the electric magnetic brake 24 for applying torque so as to reduce power consumption, and can drive the electric motor 30 to cause the self-sustained rotation of the operational section 12. COPYRIGHT: (C)2010,JPO&INPIT

Pincer-shaped electromagnetic brake for elevator traction machine

Abstract: The utility model discloses a novel pincer-shaped electromagnetic brake for elevator traction machine, which comprises a brake pincer body, a brake disk, an electro-magnet component, a guiding shaft, a restoring spring, a declutch draw rod and two friction plates, wherein the upper portion of the brake pincer body and the guiding shaft have clearance fit, and the lower portion of the brake pincer body is fixedly connected with the declutch draw rod, the left end of the brake pincer body is provided with the restoring spring, and the restoring spring and the left end of the guiding shaft have clearance fit, the brake disk is arranged between the electro-magnet component and the brake pincer body, two ends of the brake disk are respectively provided with a friction plate I and a friction plate II, wherein the friction plate I is fixed with the inner end of the brake pincer body, and the friction plate II is fixedly connected with the right end of the electro-magnet component. The electro-magnet component comprises an electro-magnet base, two groups of electro-magnet coils, an armature iron and a resilient arranged in the electro-magnet base, and the two groups of electro-magnet coils are connected in series. The novel pincer-shaped electromagnetic brake for elevator traction machine has low power consumption, which greatly saves electric energy source.

Electromagnetic brake system and electromagnetic brake for controlling motion

Abstract: An electromagnetic brake system and brake for controlling motion between a first machine body (32) and a second machine body (34) is provided. The electromagnetic brake system and brake include an interior core member (36), the interior core member coupling with the first body (32). The electromagnetic brake includes an outer exterior member (38), the outer exterior member enclosing the interior core member, the outer exterior member coupling with the second body. The electromagnetic brake includes a resilient spring brake lock member (40) having a brake torque stiffness, the resilient spring brake lock member (40) between the interior core member (36) and the outer exterior member (38), the resilient spring brake lock member (40) engaging the interior core member (36) wherein the resilient spring brake lock member inhibits rotation between the outer exterior member and the interior core member, and an electromagnetic field applied by an electromagnetic unlocking member disengages the resilient spring brake lock member from engaging the interior core member and provides for rotation between the outer exterior member and the interior core member.

Robot and robot system

Abstract: PROBLEM TO BE SOLVED: To provide a robot system capable of gently stopping a manipulator when an instantaneous stop-instantaneous disconnection is generated in a system power source, that is, relaxing influence on a decelerator due to a braking action of an electromagnetic brake and avoiding fall and damage to a workpiece during conveyance SOLUTION: This robot system is provided with a first control power source connected to the system power source to supply power, a first brake control part connected to the first control power source to supply power to a first electromagnetic brake, and a robot to be driven by a motor braked by the first electromagnetic brake The robot system is provided with a second control power source connected to the system power source to supply power, a second brake control part connected to the second control power source to supply power to a second electromagnetic brake and the second electromagnetic brake to brake the motor COPYRIGHT: (C)2009,JPO&INPIT

Disk type electromagnetic brake

Abstract: The present invention provides a disc electromagnetic brake capable of ensuring normal application and release of brake force, and simultaneously reducing vibration and noise generated at a spline connection section. The invention forms weight imbalance generation sections (11-15) in thickness range of the brake disc (3). By forming the above structure, premature abrasion and damage of the brake pad may be prevented because sections of the brake disc (3) relative to a fixed brake body (5) and an armature (6) is unnecessary to be processed. In addition, by actively forming the weight imbalance, the spline teeth (3T) of the brake disc (3) may always contact with a groove wall on a side of a spline hub (2) in spline groove (2G) direction, such that vibration and noise generated at a spline connection section may be reduced. Further, because gelatinous lubricant is unnecessary, the invention may prevent gelatinous lubricant from interfering normal application and release of brake force.

Electromagnetic brake controller of robot and method of determining abnormality of electromagnetic brake of robot

Abstract: PROBLEM TO BE SOLVED: To provide an electromagnetic brake controller of a robot, determining abnormality of an electromagnetic brake for braking a motor installed on the robot while suppressing the careless operation of the robot. SOLUTION: The state of electrification of the exciting coils B1a-B4a of non-excitation operating electromagnetic brakes B1-B4 is switched by an opening/closing operation in two steps between a main contact 8a and sub contacts 9a-12a. A relay control circuit 3 first determines the abnormality of a main relay 8 when the robot is started. Only when the main relay 8 is not abnormal, a first abnormality determination control is performed to determine the abnormality of the sub relays 9-12. When the abnormality of the sub relays 9-12 is determined, the main contact 8a is closed for a time required for confirming the state of the electrification of the sub contacts 9a-12a. COPYRIGHT: (C)2009,JPO&INPIT

Automatic-separation electric connector and its plug

Abstract: The utility model discloses an automatic separation electronic connector and a plug thereof. The automatic separation electronic connector comprises a plug and a socket; one of the plug and the socket is provided with an electromagnetic brake and an automatic separation device driven by the electromagnetic brake, and the other is provided with a mortise lock part which is matched with the automatic separating device; the electromagnetic brake comprises a coil; discharge circuits are connected in parallel between the anode and the cathode of the coil of the electromagnetic brake; the discharge circuits are fixedly connected in the printing boards of the discharge circuits on the electronic connector; in the utility model, the discharge circuits are connected in parallel between the two poles of the coil of the electromagnetic brake of the electronic connector, and the discharge circuits can consume the power energy generated by a back electromotive force when the coil is powered off, thereby leading the back electromotive force to be incapable of affecting other leads or elements and apparatuses when the coil is powered off temporarily; and the discharge circuits are arranged in the printing boards of the discharge circuits fixedly connected with the electronic connector, thus having the advantages of convenient mounting as well as reliable and safe connection.

Electromagnetic brake of oil pumping machine

Abstract: An electromagnetic brake for a pumping unit, which mainly solves the problems in the prior pumping unit braking device such as complex structure and operation, and is characterized in that an input shaft (1) is connected with a gear sleeve (3) through a key; the outer teeth of the gear sleeve (3) engage with the inner teeth of two double-side friction disks; an intermediate friction plate (12) is arranged between the two double-side friction disks (5); an armature (6) and a magnetic ring (7) are sequentially sheathed on the right ends of the double-side friction disks on the gear sleeve (3); at least two blind holes are formed on the surface of the magnetic ring (7) corresponding to the armature (6); braking springs (11) are arranged in the grooves of the blind holes; an excitation coil is embedded in the radial annular groove of the magnetic ring (7) and connected with a distribution box controller through wires; the intermediate friction plate (12), the armature (6) and the magnetic ring (7) are connected with a connection bottom plate (9) through bolts (8); and the connection bottom plate (9) is fixed on a gearbox (2) The electromagnetic brake has the advantages of simple structure and simple operation

Electromagnetic brake control device of robot

Abstract: PROBLEM TO BE SOLVED: To provide an electromagnetic brake control device capable of suppressing the heat generation of electromagnetic brakes of non-excitation operation types possessed by servo motors, in the servo motors which drive arms or the like of an articulated robot.SOLUTION: The motors 21 to 26 for driving drive shafts are arranged at respective joints of the articulated robot, and a CPU 30 controls the braking of the drive shafts by the electromagnetic brakes 21b to 26b of the non-excitation operation types possessed by the respective motors 21 to 26. In a period that the braking of the drive shafts is released, the CPU 30 maintains a state that the braking of the drive shafts is released while executing on/off-control for repeatedly turning on and off the application of voltages to excitation coils 21c to 26c of the electromagnetic brakes 21b to 26b. The CPU 30 maintains the on-state of the voltage application over a prescribed period of time in an initial stage of a period that the braking of the drive shafts is released.

Conveyance electric vehicle special for book

Abstract: A special book conveying electric vehicle for conveying books is provided. A battery unit charger box and a decelerator and direct current motor electromagnetic brake box are installed under a traditional book conveying vehicle in parallel, a hand synchronous controller is arranged at an armrest or a rudder, a battery unit and a charger are installed in the battery unit charger box, and a direct current motor and a decelerator are connected in series in the decelerator and direct current motor electromagnetic brake box, the decelerator is connected with a driving wheel, and a power supply is connected with an electromagnetic brake. When using the electric vehicle, the hand synchronous controller is started, the battery unit can supply electricity for the direct current motor, and the direct current motor can drive the driving wheel to rotate through the decelerator. When needing to stop, the hand synchronous controller is closed, and the electric brake is braked.

Elevator electromagnetic brake excitation circuit

Abstract: The invention discloses an exciting circuit for an electromagnetic brake of an elevator, comprising a control circuit for controlling the electromagnetic brake of the elevator to attract and open, a sampling feedback circuit, a zero-crossing trigger circuit, a timing circuit, a reference voltage circuit and an auxiliary power circuit supplying power. The control end of the control circuit is connected with the output end of the zero-crossing trigger circuit; the output end of the control circuit is connected with the electromagnetic brake of the elevator and one input end of the sampling feedback circuit; the other input end of the sampling feedback circuit is connected with the reference voltage circuit; the output end of the sampling feedback circuit is connected with the signal end of the zero-crossing trigger circuit; and the control end of the zero-crossing trigger circuit is connected with the timing circuit. The exciting circuit has the advantages that the structure is simple, a principle that a zero-crossing trigger is started by high voltage is utilized, the working voltage of the electromagnetic brake is automatically reduced, the effects of reducing energy consumption and cooling the electromagnetic brake are provided, physical line connecting materials can be saved, a negative feedback model is adopted to reduce interference caused by power network voltage fluctuation, and the safety, reliability and stability of elevator operation can be improved.

Electric corner rounding machine

Abstract: The utility model relates to an electric corner rounding machine, which comprises a machine frame, wherein, a guide rail is vertically arranged at the front part of the machine frame, an upper mould seat component is installed on the guide rail in a fitting manner, the upper mould seat component comprises a corner rounding cutter and a compression bar, a working platform is horizontally arranged on the machine frame at the lower part of the upper mould seat component, an electromagnetic brake motor is arranged at the rear part of the machine frame, a gearbox is installed at the output part of the brake motor, and the gearbox is connected with the upper mould seat component through a connecting rod component. The design, with the electromagnetic brake motor incorporated in that, in addition to the advantages of high reliability, and safe and efficient use, can react quickly to brake engagement or disengagement, is more applicable to the electric corner rounding machine. Moreover, due to the use of the electromagnetic brake motor, the equipment can operate more stably, and meanwhile, the capacity to start and stop instantly leads the electromagnetic brake motor to perform better in electricity saving.

Crank link stacking mechanism

Abstract: The utility model relates to a crank link stacking mechanism which comprises an electrical motor (1) provided with an electromagnetic clutch brake unit (11), a stock supporting plate (2) and a crank link mechanism (3) The crank link mechanism (3) comprises a pivoted connecting rod (31) and a swing connecting rod (32), wherein, the electromagnetic clutch brake unit (11) includes an electromagnetic clutch and an electromagnetic brake; one end of the pivoted connecting rod (31) is connected with the electrical motor (1) and driven by the electrical motor (1), and the other end thereof is articulated with one end of the swing connecting rod (32); the other end of the swing connecting rod (32) is articulated with the stock supporting plate (2); and the stock supporting plate (2) only moves in a longitudinal direction (Y direction) One revolution of the electrical motor (1) is equivalent to a working circle of the connecting rod, and the highest speed of a circle can reach 02 s Therefore, the stacking speed and the stacking efficiency can be improved greatly and cannot be limited by factors of inaccurate positioning for plate-turnover and unstable air pressure, and the optimum packing effect can be achieved

Electric motor with electromagnetic brake

Abstract: PROBLEM TO BE SOLVED: To provide an electric motor with an electromagnetic brake that reliably releases the bite-in type brake by a small absorption force, that is compact and reduced in power consumption with low noise. SOLUTION: When starting the electric motor 1, a control part 4 rotates a second brake disk 16 by a prescribed amount in a direction opposite to the direction of a rotative force acting on a rotor shaft 6 while leaving brake release operation started, thus releasing the bite-in type brake. COPYRIGHT: (C)2009,JPO&INPIT

Discharging circuit of electromagnetic brake

Abstract: A discharge circuit of a magnetic brake is applied to the magnetic brake which is extensively used on various cranes, winches, windlasses and other electric devices in industrial fields. The traditional contactor discharge circuit is improved into a non-contact fast discharge circuit. The discharge circuit is characterized in that the discharge circuit adopts a high voltage diode, a discharge resistance and a voltage dependent resistor; the discharge circuit can be directly connected with the positive end and the negative end of the direct current of the magnetic brake in parallel; peak overvoltage which is generated when magnetic coil is power off can be absorbed effectively; the insulation of the magnetic coil can be protected effectively and can not be damaged; the service life of the magnetic coil is prolonged and the running reliability of the device is improved.

Apparatus for detecting malfunctions of electromagnetic brakes of robot

Abstract: An apparatus is provided for detecting a malfunction occurring in an electromagnetic brake of a robot. In the apparatus, the main relay and the sub-relay are controlled to open the main contact and the sub-contact when the robot is activated. Detecting is then made whether or not the main contact is malfunctioning, by monitoring an energized state of the main contact. Activation of the robot is stopped when the main contact is malfunctioning and the main relay is controlled to close the main contact for a given period of time when that the main contact is operating normally. Detecting is further made as to whether or not the sub-contact is malfunctioning, by monitoring an energized state of the sub-contact The activation of the robot is stopped when the sub-contact is malfunctioning and the main relay is controlled to close the main contact when the sub-contact is operating normally.

Electromagnetic brake for electric vehicle

Abstract: The utility model relates to an electromagnetic brake for an electric vehicle, in particular to a special brake component for the electric vehicle. The utility model adopts the technical scheme as follows: a brake block and an actuating plate are arranged on a bottom plate in sequence; a fixed seat is fastened with the bottom plate; a spring guide pillar is arranged on the fixed seat; a spring is sleeved on the spring guide pillar; the fixed seat is connected with the bottom plate through a clearance tube; a coil is arranged on the fixed seat; and a connector is fixed on the axis of a rotor. The utility model is characterized in that a penetration aperture is formed at the outer wall edge of the connector, a rubber strip is arranged in the aperture, the periphery of the rubber strip slightly protrudes out of the outer wall of the connector, and the connector has the same height as the rubber strip. The utility model has the following advantages: the structure is simple, compact and reasonable; and when the brake is electrified in the non-braking state, the connector drives the brake block to rotate, and meanwhile the rubber strip generates the buffer action between the connector and the brake block and absorbs the most vibrations, thereby solving the problem that abnormal sounds generated in low or high speed rotations causes rotation noises.

Electromagnetic brake device for motor and hoisting machine for elevator using the same

Abstract: PROBLEM TO BE SOLVED: To prevent quality degradation of a bearing due to increased leakage flux easily and inexpensively even with a structure having an increased number of electromagnetic brakes. SOLUTION: At least two electromagnetic brakes 4, each of which includes a brake disc 5, a stationary braking plate 6, a movable braking plate 7, a spring 8 for brake operation and an electromagnetic coil 9 for brake release, are independently disposed in parallel in the axial direction C of a motor shaft 2. The electromagnetic brake device 3 for a motor is constructed by connecting respective electromagnetic coils 9, 9 to a power supply 12 so that a direction in which a leakage flux A from one electromagnetic coil 9 flows and a direction in which a leakage flux B from the other electromagnetic coil 9 flows are opposite to each other, relative to a bearing 11 composed of a magnetic material supported on a motor shaft 2 at a proximity position of the electromagnetic brake 4, upon concurrently energizing the electromagnetic coils 9, 9 mounted independently of each other. COPYRIGHT: (C)2011,JPO&INPIT

Abnormality detecting device of electromagnetic brake in elevator

Abstract: PROBLEM TO BE SOLVED: To provide an abnormality detecting device of an elevator brake, enhanced in safety by quantitatively determining whether or not the braking force of an electromagnetic brake is appropriate. SOLUTION: This device includes: a load cell 19 detecting a restoring force of a brake spring 13, between the brake spring 13 biasing a brake arm 10 attached with a brake shoe 9 toward a brake wheel 8 side and a spring seat 17 retaining the brake spring 13 in a compression deformed state; and an abnormality detecting section 5c determining whether or not the braking force of the electromagnetic brake 4 is out of a predetermined normal range based on the output of the load cell 19. The abnormality detecting section 5c outputs abnormality detection signals to a monitoring center 23, if the braking force of the electromagnetic brake 4 is out of the normal range. COPYRIGHT: (C)2011,JPO&INPIT

Electromagnetic coil device usable for both electromagnetic stirring and electromagnetic brake

Abstract: PROBLEM TO BE SOLVED: To optimize the relation between inside windings and outside windings in a coil device usable for both an electromagnetic stirring and an electromagnetic brake. SOLUTION: Disclosed is an electromagnetic coil device for continuous casting to steel where direct current or alternating current having three or more phases is made to flow through an electromagnetic coil, and an electromagnetic brake or an electromagnetic stirring is selectively acted on molten steel. In the electromagnetic coil, two teeth parts 1aa are projectingly provided from a yoke part 1ab. Outside windings 1c are applied to the further outsides of the two teeth parts 1aa with inside windings 1b applied thereto. In the case the sufficient number of inside windings 1b can be wound, the number of the outside windings 1c is made equal to that of the inside windings 1b. In the case the number of the inside windings 1b is insufficient, the number of the outside windings 1c is made larger than that of the inside windings 1b and is also controlled to ≤2.5 times. The electromagnetic coils are arranged by n pieces (n is a natural number of ≥2) per long side 1a, and a core part 1a is arranged in the range of a slab drawing direction including the discharge hole of an immersion nozzle 4 from a meniscus position. Even in the case the required number of inside windings can not be wound, sufficient brake performance and stirring performance can be secured. COPYRIGHT: (C)2009,JPO&INPIT

Direct current short-stroke electromagnetic brake

Abstract: The utility model discloses a direct current short-stroke electromagnetic brake, which comprises a spring adjusting device, a recoil adjuster and a base, and is characterized by further comprising a drive mechanism and an electromagnetic mechanism, wherein the electromagnetic mechanism comprises two groups of electromagnetic coils which are respectively installed on a fixed iron core which is movably hinged with the base, the drive mechanism comprises two groups of brake shoes, a short brake arm, a long brake arm and a connecting bar, wherein the two groups of the brake shoes are respectively fixed with the long brake arm and the short brake arm, the lower end of the long brake arm and the middle portion of the short brake arm are respectively connected with the base, one end of the connecting bar is connected with the long brake arm, and the other end thereof is movably connected with the free end of the short brake arm. When the electromagnetic coils are electrified, a moving iron core is absorbed to deflect leftwards, a left brake shoe is separated from a brake wheel, and a right brake shoe is driven to separate from the brake wheel, thereby opening the brake, whereas, when the electromagnetic coils are cut off, the long brake arm are pushed to deflect rightward by a brake spring, thereby realizing the contracting brake. The direct current short-stroke electromagnetic brake has the characteristics of simple structure and quick movement.

Rudder propeller with electromagnetic shaftless propulsion device

Abstract: FIELD: shipping building industry. ^ SUBSTANCE: invention refers to shipping building industry and deals with building of ship propellers for spatial movement of objects on surface or inside fluid medium, and providing controllability of objects. Rudder propeller consists of a shaftless propeller-bladed propulsion device and rotary mechanism of blade rotation plane. The latter comprises two electric motors with built-in electromagnetic brakes and external gears which are engaged with a spiral cone-type wheel whereto there rigidly attached is supporting frame of electromagnetic propeller-bladed propulsion device, which at the same time serves as propeller shrouding. That electromagnetic propulsion device is three-phase and synchronous, and is excited from constant magnets located in propeller blades. The casing of electromagnetic propulsion device consists of interleaved ferromagnetic core of stator with three-phase winding. Interleaved ferromagnetic core of rotor with short-circuit starting winding is arranged along radial direction inside stator core at the distance of air gap therefrom. ^ EFFECT: invention simplifies rudder propeller design, reduces power required for its operation, and improves maneuverability of movement and economy of useful energy conversion. ^ 2 dwg