Showing papers by "ebm-papst published in 2004"

Fan mounting means and method of making the same

Abstract: A fan arrangement comprises a fan ( 10 ) having a fan housing ( 30 ) within which is arranged a blower wheel ( 18 ) which, in operation, moves air from an intake side of the fan ( 10 ) to a delivery side. Arranged radially outside the fan housing ( 30 ) is a surrounding mounting frame ( 34 ) that serves to support the fan housing ( 30 ). A membrane ( 32 ), made of an elastic material, elastically connects the fan housing ( 30 ) and mounting frame ( 34 ) to one another and is formed with through holes or apertures ( 33 ) that, in the event of a closure of the output or delivery side of the fan arrangement ( 40 ), enable a return flow, from the delivery side to the intake side of the fan arrangement ( 40 ), of air moved by the blower wheel ( 18 ).

Electric motor with poles shaped to minimize cogging torque

Abstract: An electric motor has a rotor ( 36 ) and a stator ( 28 ) having a lamination stack formed with slots ( 126 ). The slots have a predetermined slot pitch (τ S ), and a multi-phase stator winding is arranged in them. The rotor ( 36 ) has salient poles having pole shoes ( 136 ) and a magnetic return path ( 130 ). Between the return path ( 130 ) and each pole shoe ( 136 ), a recess ( 138, 140 ) is formed for receiving a permanent magnet ( 38 ). On each side of such a permanent magnet ( 38 ), a region ( 146 a , 146 b ) of poor magnetic conductivity is arranged, in order to make the flux distribution in the air gap more sinusoidal. Measuring in a circumferential direction, the width (β) of a pole shoe ( 136 ) decreases with increasing distance from an interface ( 138 ) between said return path and said permanent magnet ( 38 ), and, at a place of lowest width, the pole shoe has an angular extent (β C) which has, with respect to the slot pitch (τ S ) between said stator slots ( 126 ), the following relationship: β C =n*τ S *(1−0.02) . . . n*τ S *(1−0.2), where n=1, 2, 3 . . . and β C and τ S are measured in mechanical degrees.

Polyphase electric motor

Abstract: An electric motor has a stator (28) and a rotor (36′) separated therefrom by an air gap (39). The rotor has a plurality of salient poles with pole shoes (260A) facing toward the air gap, and a yoke (200). The pole shoes serve to generate a sinusoidal counter-EMF. Located between the yoke (200) and a pole shoe (260A) is a recess (266A) in which a permanent magnet (262A) is arranged. Adjacent to this recess (266A) on each side in the circumferential direction is a low-magnetic-conductivity region (266A′, 266A″) that is bounded by a retaining segment (270′) made of ferromagnetic material. The latter serves to connect the pole shoe mechanically to the yoke (200). A magnetic shunt (274′, 274″) extends from a source segment (264A′, 264A″) to a target region (270′″) of one of the retaining segments.

Fan having a sensor

Abstract: A fan has a sensor (86; 186) for sensing at least one value of the air that flows through the fan (20; 120). The fan has a fan housing (22, 24; 122, 124); an electronically commutated external-rotor motor, arranged in that housing, having an internal stator (30; 130) and an external rotor (46; 146); a fan wheel (56; 156) coupled to the external rotor (46; 146); an air inlet opening (58; 90; 158) for the inflow of air that is to be moved by the fan wheel (56; 156); a circuit board (68; 185) having a portion (66; 188) that extends adjacent the air passage opening (58; 158); and conductors (82, 84; 182′, 182″) arranged on that portion (66; 188), to which conductors the sensor (86; 186) is connected, preferably by a Surface Mounted Device (SMD) method. Premounting the sensor on the circuit board facilitates automated manufacture and reduces cost.

Method and control system for electronic commutation of brushless DC motors

Abstract: Method for electronic switching of a brushless direct current motor (1) with a permanent magnet rotor (4) and a stator (2) with a number of angularly displaced windings (a, b, c). The winding currents (i a, i b, i c) are defined by the curves of the induced pole wheel voltages so that cause a predefined motor torque via the rotor rotation. The torque is applied via the rotor in a continuous jump-free manner. INDEPENDENT CLAIM included for 1) control system for electronic switching of a brushless direct current motor, 2) brushless direct current electric motor.

Dual blower unit

Abstract: The double fan assembly (1) has two motor powered co-axially driven radial fans (2,3), with a fan sub-assembly on each of the electric motor shaft ends, and a casing sub-assembly (16) housing the fan sub-assembly. The casing sub-assembly consists of two separate fan casings (18) to accommodate each fan impeller and a separate support element (20) for support of the fan sub-assembly in the region of the electric motor (4). The two fan casings by the support element (20) are interconnected and connected to the fan sub-assembly to form a premounted overall sub-assembly.

Method for starting up an electrical installation

Abstract: The method involves having an electric installation with spatially distributed electromechanical functional units (1) which are arranged on specific constructional positions. The functional units are controlled in an individual manner by a network address (7) which is stored in an electronic form via a signal transfer network from a central control unit (3). Each functional unit is provided with a first optical, electromagnetic and or mechanical identification code (6) which can be read from the outside and which is allocated to the device-specific internal address. Each functional unit also has a second optical, electromagnetic and or mechanical additional code (8) which contains specific information and which can also be read from the outside. Both codes (6, 8) are detected in pairs and electronically stored and are transferred to the control unit (3) for further processing using optical, electromagnetic and or mechanic reader.

Device and method for controlling a d.c. voltage

Abstract: The invention relates to a method for the provision of a D.C. voltage, in particular for a motor vehicle which is supplied by a battery when at a standstill. The method is carried out by means of a microcontroller νC (40), an auxiliary supply (231; 232; 320, 331) and a seal-in circuit (26; 26') for maintaining the auxiliary supply in an active state. The method comprises the following steps: the auxiliary supply (231, 232; 320, 331) is activated by a closing criterion, which initiates the activation of the microcontroller νC (40), the latter in turn activating the seal-in circuit (26; 26'); the microcontroller νC (40) detects the presence of a disconnection command and after said detection the seal-in circuit (26; 26') is deactivated by the microcontroller νC (40) with a delay corresponding to predetermined criteria.

Electronically commutated electric motor, and method for controlling one such motor

Abstract: The invention relates to an electronically commutated electric motor (10) comprising at least one stator winding phase (12, 14), and a method for controlling one such motor. The aim of the invention is to reduce power loss. To this end, the duration of the intervals (T-t) between the pulses of the control signals for feeding the at least one stator winding phase (12, 14) is essentially constant.

Electronically commutated motor and method for controlling the same

Abstract: The invention relates to an electronically commutated motor (10) and to a method for controlling an electronically commutated motor (10). In order to reduce commutation noises, the invention provides that a component (48) is used for influencing the operating range of the power transistors (20, 22) so that they produce, via the stator winding (12, 14), a current that is essentially constant during the respective supply of current.

Speed control method and device for a two-pulse motor operating with auxiliary torque

Abstract: The invention relates to a method for rotational speed control of a two-pulse electronically switched motor which operates with an auxiliary reluctance torque (fig. 13:MR) and comprises at least one stator winding strand (32), a rotor (38) and a control unit (76) for controlling the motor (30) at a desired rotational speed (nsoll; t s). The inventive method consists in continuously collecting the characteristic value of the rotor (38). Above a determined minimum rotational speed (+NMIN, -NMIN), the operation of the motor (30) is adjusted to an independent value (BW) of a desired rotational speed. Above said minimum rotational speed (+NMIN, -NMIN), the operation of the motor (30) is adjusted to a value (BW) which is a difference function between the desired rotational speed (nsoll; t s) and an actual rotational speed (n; T HALL). A corresponding motor is also disclosed.

Mini fan to be fixed in a recess of a wall

Abstract: Disclosed is a mini fan (126) that is embodied for mounting in a recess (124) of a wall (122) which is provided with a plurality of holding members (128, 129) at the periphery of said recess (124). The inventive fan comprises a housing (136) for conducting air, which extends into the recess (124) of the wall (122) with a section (127) that is approximately complementary to said recess in the mounted position thereof. At least one part (138) that is made of an elastomeric material is disposed at the periphery of said housing section. The fan (126) can be inserted into the holding members (128, 129) with the aid of said part (138) during mounting thereof by displacing the fan (126) along the wall (122) in order to make at least some sections of said part (138) rest in a sealing manner against the wall (122) in the mounted position.

Rotor digital position measurement method for an electric motor, in which the rotor position signal is converted into a digital value with at least 2-bit resolution

Abstract: A method for operating an electric motor with a stator and outer rotor (40) that has a multi-polar (55) sensor magnet (54) and at least one rotor position sensor (42, 44) attached to the stator. The method has the following steps: generation of a rotor position signal dependent on the rotation of the sensor and application to a position evaluation device and; conversion of a rotor position signal into a digital value with at least 2-bit resolution. An Independent claim is made for an electric motor with a sensor arrangement for output of digital position signals.

Electronically commutated motor

Abstract: not available for EP1472772Abstract of corresponding document: WO2004049545An electronically commutated motor has an inner stator (44) and an outer stator (22), extending around the same and having a shaft (34). The motor further comprises a bearing system (36) provided on the inner stator (44), for said shaft (34). Said bearing system (36) is disposed in a bearing support tube (38) which substantially consists of a plastic material with a thermal conductivity of >/= 1 W/mK that communicates with a cooling body (39) in a heat-conducting manner. The motor further has a rotor bell (24) that is linked with the shaft (34) in a heat-conducting manner and that consists of a plastic material with a thermal conductivity of >/= 1 W/mK. The invention is preferably used for small horsepower and subfractional horsepower motors.

Electric motor with space-saving low-resistance neutral ring

Abstract: A compact electric motor has a rotor, and a stator ( 10 ) having a slotted lamination stack ( 16 ) defining slots separated by teeth, the teeth having tooth heads ( 153 ). Partial windings ( 17 ) are arranged on the teeth. On at least one axial end of said lamination stack, jumper rings ( 11, 12, 13 ) and a neutral ring ( 14 ) are arranged. The neutral ring has a plurality of inwardly extending radial projections ( 141 ) having free ends ( 142 ) adapted for connection to ends ( 171 ) of the partial windings ( 17 ). Connection of partial windings ( 17 ) in parallel provides a favorable power/size ratio and substantial power output, even with low operating voltage.

Multiphase electric motor for various applications has permanent magnets with chamfered edges arranged to form square in rotor to make pole shoes

Abstract: Rotor (36') is made of a large number of laminae stacked together on a central shaft. Each lamina has four slots accommodating permanent magnets (266A-D) arranged to form a square in end view. The outer edges of the magnets are chamfered (264A'-D''). There are empty spaces (266A'-D'') at the edges of the permanent magnets. The parts of the laminae forming the pole shoes (260A-D) lie outside the magnets.

Firing equipment for gas burners has means for determining value dependent on measured temperature and means for regulating generated temperature using characteristic line representing value range corresponding to ideal temperature

Abstract: The firing equipment has means for determining a value dependent on a measured temperature produced by the equipment and also means for regulating the generated temperature by using a characteristic line representing a value range corresponding to the ideal temperature in dependence on a first parameter corresponding to the burner power. A second parameter corresponding to a ratio of air volume to quantity of burner medium in a mixture of air and burner medium to be supplied to the burner is constant in the characteristic line so that a first parameter is produced corresponding to a specific burner power. The firing equipment has a device in the region of the burner flame (13) to measure the temperature produced by the firing equipment.

Ventilating fan has an elastomer membrane linking an inner impeller housing and an outer supporting frame

Abstract: The fan(10) comprises a housing(30) enclosing an impeller(18) which conveys air from the suction side to a pressure side. A supporting frame(34) surrounds and holds the fan arrangement(40). A membrane(32) made of an elastic material forms a flexible connection between (30) and (34). The fan(10) comprises a housing(30) enclosing an impeller(18) which conveys air from the suction side to a pressure side. A supporting frame(34) surrounds and holds the fan arrangement(40). A membrane(32) made of an elastic material forms a flexible connection between the housing and the supporting frame. Openings(33) in the membrane permit air from the impeller to flow back from the pressure side to the suction side when the pressure side is closed off. The membrane(32) is connected around the whole outer circumference of the housing(30) and over the entire inner circumference of the supporting frame(34). Connection between the membrane, housing and/or supporting frame. Membrane cross-section in the radial plane can be a U-shape or a wave form. Thickness of the membrane at the connection points to the housing and supporting frame is greater than at points between the two points. The U-shaped membrane has a bulge(32''') and openings(33) are located in this region. Openings may be round, rectangular or square or may be elongated holes with rounded or sharp cornered ends. An independent claim is included for a process for manufacturing the fan arrangement(40) in which first and second moving tool parts of an injection molding tool are moved into position between the fan housing and the supporting frame and a membrane is injection molded in a plastic between the two tool parts to join the housing and frame together.

Fan assembly and its fabrication method

Abstract: The fan(10) comprises a housing(30) enclosing an impeller(18) which conveys air from the suction side to a pressure side. A supporting frame(34) surrounds and holds the fan arrangement(40). A membrane(32) made of an elastic material forms a flexible connection between (30) and (34). The fan(10) comprises a housing(30) enclosing an impeller(18) which conveys air from the suction side to a pressure side. A supporting frame(34) surrounds and holds the fan arrangement(40). A membrane(32) made of an elastic material forms a flexible connection between the housing and the supporting frame. Openings(33) in the membrane permit air from the impeller to flow back from the pressure side to the suction side when the pressure side is closed off. The membrane(32) is connected around the whole outer circumference of the housing(30) and over the entire inner circumference of the supporting frame(34). Connection between the membrane, housing and/or supporting frame. Membrane cross-section in the radial plane can be a U-shape or a wave form. Thickness of the membrane at the connection points to the housing and supporting frame is greater than at points between the two points. The U-shaped membrane has a bulge(32''') and openings(33) are located in this region. Openings may be round, rectangular or square or may be elongated holes with rounded or sharp cornered ends. An independent claim is included for a process for manufacturing the fan arrangement(40) in which first and second moving tool parts of an injection molding tool are moved into position between the fan housing and the supporting frame and a membrane is injection molded in a plastic between the two tool parts to join the housing and frame together.

Fan with laminar flow element in front of the suction hole

Abstract: A radial fan (1) with a housing (2) and a fan impeller (3) disposed therein, an air inlet (4) and an air outlet (5) is provided, a pressure space (6) being formed between the latter, and in front of the air inlet (4) a laminar element (7) being disposed which, in a bypass (8) formed therein, has a sensor (9) for recording at least one parameter of the medium flowing through the air inlet (4).

Multi-phase electric motor with rotor having embedded permanent magnets

Abstract: Rotor (36') is made of a large number of laminae stacked together on a central shaft. Each lamina has four slots accommodating permanent magnets (266A-D) arranged to form a square in end view. The outer edges of the magnets are chamfered (264A'-D''). There are empty spaces (266A'-D'') at the edges of the permanent magnets. The parts of the laminae forming the pole shoes (260A-D) lie outside the magnets.

Device for detecting absolute angle of shaft, especially of electric motor, has single turn rotation sensors for detecting positions of shaft and rotary element in multi-turn rotation sensor

Abstract: The device has a first single turn rotation sensor on an end of the shaft for detecting its angular position within one turn and a multi-turn sensor unit for detecting the number of rotations of this shaft with a reduction gear driven by the shaft, a rotary element connected to its output on an imaginary extension of and coaxial to the shaft and a second single turn sensor for detecting the position of the rotary element within a single turn. The device has a first single turn rotation sensor (30) on an end of the shaft (14) for detecting its angular position within one turn and a multi-turn sensor unit for detecting the number of rotations of this shaft with a reduction gear (18) driven by the shaft, a rotary element (42) connected to its output on an imaginary extension of and coaxial to the shaft and a second single turn sensor (48) for detecting the position of the rotary element within a single turn.

Fan and fastening element and method of assembling

Abstract: An improved structure and method for mounting a fan, particularly a miniature fan ( 3 ), in a supporting wall ( 4 ), both facilitates a mounting operation and minimizes noise conduction after the mounting operation. An elastomeric overcoat ( 1 ) at least partially surrounds the fan ( 3 ) and is preferably integrally formed with a plurality of mushroom-shaped mounting elements ( 7 ) adapted to engage in a corresponding plurality of mounting holes ( 41 ) formed in the supporting wall ( 4 ). Each mounting element has a shaft portion ( 71 ) and a head portion ( 72 ) with an internal channel ( 74 ) starting in the shaft portion ( 71 ) and ending in the head portion ( 72 ). Rapid mounting of the fan ( 3 ) to the wall ( 4 ) can be accomplished by inserting a respective tool ( 10 ) into the channel ( 74 ) of each mounting element ( 7 ), to elongate the mounting element and reduce its diameter, passing the elongated mounting element into its mounting hole ( 41 ), and withdrawing the tool, permitting elastic relaxation of the mounting element to restore its original diameter, thereby forming a secure, vibration-damping engagement with the periphery of the mounting hole.

Verfahren und Steuersystem zur elektronischen Kommutierung eines bürstenlosen Gleichstrommotors

Abstract: Die Erfindung betrifft ein Verfahren sowie ein Steuersystem zur elektronischen Kommutierung eines burstenlosen Gleichstrommotors (1) mit einem permanentmagnetischen Rotor (4) und einem Stator (2) mit mehreren elektrisch versetzten Wicklungsstrangen (a, b, c). Die Wicklungsstrange (a, b, c) werden zur Erzeugung eines magnetischen Statorfeldes zum Drehantrieb des Rotors (4) in Abhangigkeit von dessen Rotorlage mit Wicklungsstromen (i a , i b , i c ) angesteuert, wobei die Rotorlage sensorlos durch Auswertung einer an einer jeweils gerade nicht stromfuhrenden Wicklungsanschlussleitung (A, B, C) mesbaren, vom Rotor (4) in den Wicklungsstrangen (a, b, c) induzierten Polradspannung (u p ) erfasst wird. Die Wicklungsstrome (i a , i b , i c ) werden mit einem bestimmten, von dem Verlauf der in den Wicklungsstrangen (a, b, c) induzierten Polradspannung (u pa , u pb , u pc ) abhangigen Soll-Verlauf derart vorgegeben, dass sie ein uber die Rotor-Drehung hinweg vorbestimmtes Motor-Drehmoment (m Soll ) bewirken, uber die Rotor-Drehung kontinuierlich ohne abrupte, schaltbedingte Sprunge verlaufen sowie Stromlucken fur die sensorlose Rotorlage-Erfassung aufweisen.

Arrangement with an electric motor and method for manufacturing the arrangement

Abstract: The arrangement has an electric motor with at least one piece of sheet with conducting tracks for connecting the motor (11) to the second part (24) and has plastic molded on at least in regions to form insulation between the conducting tracks (52,54,56). The first part (20) has regions (102,106) between two or more adjacent conducting tracks in which both parts of the sheet piece and molded plastic are removed to electrically isolate the tracks. An independent claim is also included for the following: (a) a method of manufacturing an inventive arrangement.

Steering assisting unit for a motor vehicle is driven by an electric motor through a mechanical coupling which can be disengaged using mechanical energy from a store

Abstract: A steering assisting unit, especially for a motor vehicle, comprises an operating unit (14) to adjust at least one wheel mechanically coupled (31) to an electric motor (10). A mechanical energy store (59) gives energy to disengage the coupling when activated by an electrical unit (32) and separate the motor under a given condition.

Kommutierungsverfahren, insbesondere für einen kollektorlosen Gleichstrommotor

Abstract: Die Erfindung betrifft ein Kommutierungsverfahren fur einen Elektromotor, insbesondere einen kollektorlosen Gleichstrommotor, mittels einer Halbleiterbruckenschaltung, bestehend aus Schaltelementen (T1 bis T4) und dazu jeweils parallelen Freilaufelementen (D1 bis D4). Die Schaltelemente (T1 bis T4) werden jeweils in Kommutierungszeitpunkten abwechselnd paarweise so zum Offnen oder Schliesen angesteuert, dass sich die Richtung eines Stromes durch eine Motorwicklung (W) umkehrt. Vor jedem Kommutierungszeitpunkt wird jeweils eines der paarweise durchgeschalteten Schaltelemente (z. B. T1) derart um eine bestimmte Zeit fruher als das zugehorige andere Schaltelement (z. B. T4) geoffnet, dass der Strom (i) uber das noch eingeschaltete Schaltelement (z. B. T4) und eines der Freilaufelemente (z. B. D3) wahrend eines Abklingvorgangs innerhalb der Halbbruckenschaltung abgebaut wird.

Electronic commutator motor such as for a miniature fan in a computer, has a heat conducting bearing tube in close contact with a cooling body

Abstract: The motor has an inner stator (44) around which extends an outer rotor (22). The rotor has a shaft (34). A bearing arrangement (36) for this shaft is arranged on the inner stator. The bearing arrangement (36) is arranged in a bearing carrier tube (38). This is formed of plastic which has a heat conductivity value of at least 1 Watt per mK. This tube is in close heat transmitting contact with a cooling body (39) which is also made of a good heat conducting material. Independent claims also cover an arrangement with components to be cooled and a cooling device including such a motor.

Electronically Commutated Motor & Method for Controlling the Same

Abstract: The invention relates to an electronically commutated motor ( 10 ) and to a method of controlling an electronically commutated motor ( 10 ). In order to reduce commutation noise, it is proposed to influence the working range of the power-stage transistors ( 20, 22 ) with the aid of a component ( 48 ), in such a way that each transistors produces, during energization of each respective stator winding, a substantially constant current through the stator winding ( 12, 14 ). Preferably, each power-stage transistor operates within a pinch-off range.

Fan for equipment comprises an air-conveying channel containing a fan wheel rotating about a central axis and having a central hub with an outer periphery on which fan blades are fixed

Abstract: Fan (10) comprises an air-conveying channel (16) containing a fan wheel rotating about a central axis and having a central hub (20) with an outer periphery (27) on which fan blades (26A-26E) are fixed. The fan blades extend with their radial outer edges up to a surface (17) arranged coaxially to the central axis and externally defining the air-conveying channel. The fan blades have sickle-shaped concave front edges and are provided in the region of their radial outer edges with a flow element (winglet) (42A-42E) designed as an obstruction for a compensation flow running about this radial outer edge from the pressure side to the suction side. Independent claims are also included for alternative fans.