Showing papers by "ebm-papst published in 2006"

Method of operating an electronically commutated motor, and method for carrying out such a method

Abstract: In this method, the value of a temperature-dependent motor parameter (k e ) of an electronically commutated motor ( 124 ) is determined during motor operation without a temperature sensor. The motor has a stator ( 201 ) having stator phases ( 202, 204, 206 ), and a permanent-magnet rotor ( 208 ) coacting with that stator, which rotor induces voltages (U IND ) in the stator phases during operation, a power stage ( 122 ) being associated with the stator phases in order to control their energization. In this method, energization of the stator phases is interrupted while the rotor ( 208 ) is rotating. A value (U IND ) characterizing an induced voltage, and a value (ω) characterizing a rotation speed of the motor, are ascertained. On the basis of those values, the value of the temperature-dependent motor parameter (k e ) is derived. The invention also concerns a motor for carrying out such a method. The method requires no temperature sensor, and can be integrated into an “embedded program” such as the program otherwise needed for electronic commutation.

Fan housing with strain relief

Abstract: An equipment fan has a housing ( 22 ) that externally defines an air passage opening ( 41 ) provided in the fan ( 20 ). The fan has a motor ( 21 ) for rotatably driving blades ( 40 ) about a rotation axis ( 23 ), as well as a carrier element ( 51 ), provided between the motor ( 21 ) and the housing ( 22 ), which extends transversely to the passage ( 41 ) and is configured as a trough ( 53 ) that serves to receive an electrical lead ( 52 ) and guides the lead along a predetermined path from the motor ( 21 ) to a location ( 64 ) on the housing ( 22 ). The fan also has a deflection device ( 50 ) which, by deflecting the lead ( 52 ) at a first deflection location ( 55 ) and at a second deflection location ( 84 ) and in at least two planes extending at a predetermined angle with respect to one another, effects strain relief for the lead ( 52 ) that proceeds to the motor ( 21 ).

Absolute encoder and method for generating an absolute value for an angle of rotation

Abstract: Disclosed is an electric motor (10) comprising a stator (12) and a rotor (14) with a shaft (87). The rotor (14) is provided with a sensor magnet (82) with a number SP of sensor poles (71, 72, 73, 74) for creating a predefined distribution of the magnetic flux density, wherein SP = 2, 4, 6, 8 etc. The motor further comprises at least two rotor position sensors (450, 455, 460, 465) for generating rotor position signals (B_S1, B_S2) which characterize the magnetic flux density. Said rotor position sensors (450, 455, 460, 465) are disposed in the region (30) of the circumference of the sensor magnet (82). The motor also comprises an evaluation device (32) that determines an absolute value (phi_el, phi_mech) for the rotational position of the rotor (14) from the rotor position signals (B_S1; B_S2). Also disclosed is a method for generating an absolute value for the rotational position of the rotor of an electric motor.

Method and arrangement for commutating an electronically commutated motor

Abstract: An electronically commutated motor has a permanent-magnet rotor ( 124 ) having: at least two rotor poles ( 183, 186, 188, 189 ); at least one phase ( 126 ); a power stage ( 122 ); and a rotor position sensor ( 140 ). Associated therewith is a control circuit implemented to carry out the following steps in order to even out the motor current ( 320 ): A) after a change of the rotor position signal ( 182 ), referred to as a first pole change, a first value (I_MEAS(HCnt−1)) of the current through the at least one phase ( 126 ) is ascertained; B) after a predetermined time span (T_Default+T_Offset(HCnt−1)), a new commutation is carried out; C) after a change of the rotor position signal ( 182 ), referred to as a second pole change, a second value for the motor current (I_MEAS(HCnt)) is ascertained; D) as a function of the difference between the first value (I_MEAS(HCnt−1)) and second value (I_MEAS(HCnt)), the value for the predetermined time span is modified.

Stator for an electric motor having a temperature monitor

Abstract: A stator for an electric motor, in particular for an external rotor motor, includes a laminated stator core which is provided with a stator winding and having a connecting arrangement, which is arranged on one end side in the region of an end winding of the stator winding, for the purpose of electrically connecting winding wire ends of the stator winding and connecting wires of a temperature monitor connected upstream of the stator winding The connecting arrangement has an insulating switching disk which covers the region of the end winding, in particular in the form of a cap The temperature monitor is held in the switching disk in an integrated manner such that, on the end-winding side, it rests between the Mater winding and the switching disk such that it is in thermally conductive bearing contact with said stator winding

Method for operation of a two-phase electronically-commuted motor and motor for carrying out said method

Abstract: The invention relates to a two-phase electronically-commuted DC-motor, comprising a permanent magnetic rotor (36), terminals (28, 30) for connecting the motor to a power supply (22) and a stator (102) with a winding arrangement. The above has a first winding phase (52), provided with a first controllable semiconductor circuit (70), for control of the current in the first winding phase (52) and a second winding phase (54), provided with a second controllable semiconductor circuit (80), for control of the current in the second winding phase (54). The first and second semiconductor circuits (70, 80) together define a partial amount of semiconductor circuits for the electronic commutation. The motor also comprises a third controllable semiconductor circuit (50), arranged in a line from one of the terminals (28, 30) to the winding (52, 54), a device (74) for prevention of a reverse current, arranged in a common line to the semiconductor circuits (70, 80) of the partial amount and an arrangement for carrying out the following steps: depending on a desired operating condition of the motor (20), the third semiconductor circuit (50) is alternately blocked and activated without switching the semiconductor circuit from the partial amount currently in a conducting state off, such that, during operation, following a blocking of the third semiconductor circuit (50), a decaying ring current (i2, i3), flows through the semiconductor circuit from the partial amount currently in a conducting state and the other semiconductor circuit from the partial amount or a recovery diode (76, 81 ), provided therein and through the first and second winding phase (52, 54), generating a torque on the motor when the energy from the power supply (22) is temporarily interrupted.

Cooling device for a radial fan driven by an electric motor with IC

Abstract: A radial fan includes an integrated circuit which is conductively connected to a printed circuit board to control a motor. The flow of air provided by a cooling impeller is conveyed directly to the integrated circuit to cool the integrated circuit during operation of the radial fan.

Stator for electric motors having a winding interconnection assembly

Abstract: Die vorliegende Erfindung betrifft einen Stator (2) eines Elektromotors, insbesondere eines Ausenlaufermotors, mit einer aus einer Anzahl von Statorspulen (a bis 1) gebildeten ein- oder mehrstrangigen Statorwicklung und einer an einer Stirnseite (14) des Stators (2) angebrachten Verschaltungsanordnung mit uber Leiterbrucken (44) verbundenen, jeweils einem Wicklungsstrang (U, V, W) zugeordneten Wicklungskontaktelementen (42), die als Wickelstutzpunkte zwischen den Statorspulen (a bis I) die Statorwicklung kontaktieren. The present invention relates to a stator (2) of an electric motor, in particular an external rotor motor, formed with one of a number of stator coils (a to 1) single or multi-strand stator winding and on one end face (14) of the stator (2) mounted interconnection with via conductor bridges (44) connected, in each case one winding phase (U, V, W) associated winding contact elements (42), the contact points between the winding as the stator coils (a to I), the stator winding. Die einander zugeordneten Wicklungskontaktelemente (42) und die Leiterbrucken bilden ein einteiliges Verschaltungselement in Form eines Ringsegments, in welcher n, n = 2, 3..., Wicklungskontaktelemente (42) durch (n-1) teilkreisformig gebogene Leiterbrucken verbunden sind und diese Verschaltungselemente axial nebeneinander auf der Stirnseite (14) des Stators (2) angeordnet sind. The associated winding contact elements (42) and the conductor bridges form a one-piece interconnection element in the form of a ring segment, in which n, n = 2, 3 ..., winding contact elements (42) are connected by (n-1) part-circular curved conductor bridges and this interconnection elements axially beside each other on the end face (14) of the stator (2) are arranged.

Automotive Electrical Actuation Technologies

Abstract: The present paper presents an overview of actual high performance electric drives for automotive applications. The field of applications spans a broad range from active steering, power steering, electromechanical brakes, clutch and shift actuators, suspension, damping and stabilization actuators, heating, ventilation, and air conditioning up to starter-generators and traction, including x-by-wire (e.g. steer-by-wire, brake-by-wire). Most of these applications require high performance motors with a high torque/volume (mass) ratio, low inertia, high dynamics, good field-weakening and high temperature standing capability. In the actual situation on the global automotive market the demands for the electric actuators become more stringent.

Control circuit for an electronically commuted motor

Abstract: The invention relates to a control circuit for an electronically commuted motor (120) with a power stage (122), comprising at least two semiconductor switches (216, 218) for control of the motor current. The semiconductor switches may be controlled by commuting signals. The control circuit comprises a current measuring body (170) for the generation of a motor current control parameter (I), dependent on the motor current, a base diode (240), arranged in series with the current measuring body and between the current measuring body and the at least two semiconductor switches and a motor current adjuster (180), which may be influenced by the commutation signal depending on the motor current control parameter.

Stator of an electric motor

Abstract: The invention relates to a stator of an electric motor, comprising a laminated stator core ( 1 ) which is provided with electrical insulation ( 8 ) composed of plastic, and a stator bushing ( 3 ) which can be pressed into a central axial opening ( 2 ) in the laminated stator core ( 1 ), forms a bearing seat for a rotor shaft ( 10 ) and is composed of metal. In order to reduce the manufacturing complexity, with the aim at the same time to reduce the amount of noise developed and to improve the electrical insulation of the bearing seat, the invention proposes that the laminated stator core ( 1 ) and the metallic stator bushing ( 3 ) which is pressed into the laminated stator core ( 1 ) are at least partially surrounded by a extrusion coating ( 8 ), which is composed of plastic and forms the insulation ( 8 ).

Electric Motor And Method Of Controllling Said Motor

Abstract: The invention relates to a sensorless electric motor and a method of controlling such an electric motor, which motor comprises a permanently magnetic rotor, a stator having at least one winding, and a power stage for influencing the current flowing through the winding. As a function of a predetermined commutation duration (T_K), a commutation period is defined, during which period the direction of the magnetic field generated by current flow through the winding is not modified, during which period a commutation completion operation (107) and a commutation initiation operation (109) take place, and which period starts at a first commutation instant (t_KN) and ends at a second commutation instant (t_KN+1); preferably, commutation timing is adjusted, based upon a value of induced voltage picked up at a currently non-energized one of the winding strands, during a plateau portion (108) of a winding voltage trace, located temporally between commutation instants.

Vibration damping support

Abstract: Die Erfindung betrifft eine schwingungsdampfende Lagerung (1) eines Motors auf einem Untergrund (2), mit einer motorseitigen Halterung (3), einer am Untergrund angeordneten Aufnahme (4) und einem elastischen Element (5), das einen Hohlraum aufweist und zwischen der Halterung (3) und der Aufnahme (4) angeordnet ist, wobei der Hohlraum des Elements (5) an seinem der Aufnahme (4) zugewandten Endabschnitt (9) geschlossen und ein Endabschnitt (9) des Elements (5) formschlussig in einem Sockel (11) des Untergrunds (2) gehalten ist. The invention relates to a vibration-damping mounting (1) of a motor on a base (2), with a motor-side bracket (3), one arranged on the substrate holder (4) and an elastic element (5) having a cavity and between the retainer (3) and the receptacle (4) is arranged, wherein the cavity of the element (5) at its said receptacle (4) facing end section (9) is closed and an end portion (9) of the element (5) in a form-fitting manner in a socket (11 ) of the substrate (2) is held.

Brushless electric motor

Abstract: An electric motor has a stator (224) with a bearing tube (238) of a magnetically transparent material, also a rotor (222) with a rotor shaft (234), which is at least partially mounted in the bearing tube (238), and a magnet ring (250), which is arranged in a rotationally fixed manner on the rotor shaft (234) within the bearing tube (238). To generate rotor position signals in accordance with the rotational position of the magnet ring (250), two magnetic field-dependent analog sensors (248', 248'') are arranged with an angular spacing (PHI) on a printed circuit board (246) outside the bearing tube (238). For processing these rotor position signals to form a signal which indicates the absolute rotational position of the rotor (222), a corresponding device (150) is provided, serving for controlling the motor.

External-rotor motor having a stationary bearing shaft

Abstract: An improved drum motor, preferably electronically commutated, features a unitary stationary central shaft ( 18 ) supporting a stationary inner stator ( 52 ), and an external rotor ( 49 ), including permanent magnets ( 54 ), secured to an inner surface of a generally cylindrical rotatable casing part ( 18 ). This permits variable speed operation while avoiding any need for an internal gear linkage. Safety is improved by making sealing plates ( 76, 78 ) at respective axial ends of the casing ( 14 ) stationary, and providing an annular peripheral seal ( 90 ) around each sealing plate. Respective rolling bearings ( 24, 44 ) near each end of the casing ( 14 ) facilitate rotation of the external rotor ( 49 ) relative to the stator ( 52 ), and a clamping arrangement ( 30 ) minimizes noise from the bearings.

Circuit arrangement for driving an electrical circuit breaker at high voltage potential

Abstract: The invention relates to an electrical circuit arrangement for driving switching power semiconductor components at high voltage potential with a control signal predetermining a switching information for the power semiconductor component and an output voltage directly controlling the power semiconductor component. A non-controllable semiconductor valve is used as component with high dielectric strength for transferring the switching energy and the switching information.

Electronically comutated motor and method for controling an electronically comutated motor

Abstract: The motor has an output stage (122) and a measuring resistor (242) detecting measuring value for the current flowing into the stage. An over-current measuring unit (152) evaluates the valve and detects the current exceeding a given threshold value. A hold unit generates and stores an over current signal in the measuring resistor and conveys a corresponding signal to the stage to counteract the over-current. An independent claim is also included for a method of controlling an electronically commutated motor.

Electric motor for e.g. driving blower, has rotor position sensors that are arranged at distance in printed circuit board for producing sinusoidal signals, and signal generator produces pulsed signal for sinusoidal signals

Abstract: The motor has a stator, and a rotor (14) that rotates about a rotation axis. Two analog rotor position sensors are produced for producing rotor position signals that characterize magnetic field density of magnetic flux acting on the sensors. The sensors are arranged at a distance in a printed circuit board (468) for producing sinusoidal signals. A signal generator produces a pulsed signal for the sinusoidal signals.

Electronically commutated motor (ecm) and method of controlling an ecm

Abstract: An electronically commutated motor comprises a rotor ( 208 ); a stator ( 201 ) electromagnetically interacting with the rotor ( 208 ), which stator is formed with a stator winding ( 202, 204, 206 ); a power stage ( 122 ) controlling the currents flowing in the stator winding ( 202, 204, 206 ) during operation; at least one current measuring element ( 242, 244 ) for sensing a measured value for the currents (I_UPPER, I_LOWER) flowing in the power stage, and an overcurrent measuring element ( 152, 162 ) for evaluating an associated measured value and for sensing a current whose absolute value exceeds a predetermined limit value (I_MAX_UPPER, I_MAX_LOWER); a holding element ( 154, 164 ) associated with the overcurrent measuring element ( 152, 162 ), configured, when an overcurrent occurs in the associated current measuring element ( 242, 244 ), to generate an overcurrent signal (OC_UPPER, OC_LOWER), to store the signal, and to deliver a signal to the power stage ( 122 ).

Electronically commuted electric motor and method for production thereof

Abstract: An electronically commuted electric motor comprises an inner stator (18) and an outer rotor (24), separated by an air gap (23). A circuit board (68) provided with recesses (58', 70', 72') is arranged on the inner stator (18). The inner stator (18) has a lamination bundle (22), provided with a winding arrangement (60; 86, 88), the connections of which are at least partly embodied as wire sections (86E, 88E, 90). The lamination bundle (22) of the inner stator (18) is at least partly covered by an insulation layer (20) made from a thermally-stable plastic. Support elements (58; 70, 72) are embodied thereon, extending from the inner stator (18) in the direction of the circuit board (68) which serve for the fixing of the wire sections (86E, 88E, 90) of the winding arrangement (86, 88). Said support elements (58, 70, 72) with the wire sections arranged thereon are each arranged in a corresponding recess (58', 70', 72') of the circuit board (68) and soldered to the same therein.

Method and device for commutating an electronic commutated motor

Abstract: The method involves determining a value of a current of an electronically commutated motor (120), after a change of rotor position signals, which are assigned to a pole change. A new commutation is executed after expiration of a preset time period after the pole change. Another value for the current is determined after a change of the signals, which take place on the new commutation. The value for the time period is changed based on the difference between the two values of the motor current to cause adjustment of the values for the motor current during an application of the changed value. An independent claim is also included for an electronically commutated motor with a permanent magnetic rotor.

Comprehensive Experimental Analysis of the IPMSM for Automotive Applications

Abstract: The present paper deals with the in-depth experimental analysis of PMSM considering the motor design solution for an electric assisted active steering system as a case study. The experimental motor and the complete laboratory set-up including the power electronic, motor control and measurement devices are presented. A comprehensive measurement procedure will be described and the measurements results will be presented and interpreted.

External rotor electrical motor has a coupled impeller that induces cool air flow around the coils of an internal stator

Abstract: The motor has an external rotor [28] that is cup shaped and a ring shaped internal stator [40]. Fixed to the rotor is an impeller [58] that is shaped so as to cause an air flow [86] that passes around the coils [44] of the stator. The induced air flow draws in cooler air through holes [74] in the rotor. The warm exits axially through a gap [88].

Excess air coefficient adjusting process for firing apparatus involves determining maximum temperature, adjusting setpoint value and measuring setpoint temperature

Abstract: The adjusting process involves determining the maximum temperature generated by the firing apparatus, and adjust in the desired setpoint value of the excess air coefficient. The associated setpoint temperature is measured. From these data, a characteristic curve for the correlation between the respective air mass flow rates and setpoint temperature is at the desired setpoint value can be determined.

Electronically commutated motor commutation method, involves changing value for preset time period based on difference between two values of motor current to cause adjustment of values for current during application of changed value

Abstract: The method involves determining a value of a current of an electronically commutated motor (120), after a change of rotor position signals, which are assigned to a pole change. A new commutation is executed after expiration of a preset time period after the pole change. Another value for the current is determined after a change of the signals, which take place on the new commutation. The value for the time period is changed based on the difference between the two values of the motor current to cause adjustment of the values for the motor current during an application of the changed value. An independent claim is also included for an electronically commutated motor with a permanent magnetic rotor.

Connecting device for an electric motor

Abstract: The invention relates to a connecting device (2) for an electric motor, particularly an external rotor motor, to connect ends of a stator winding to a connecting lead (65). Said connecting device (2) is composed of a wiring plate (4) which is arranged on a plane extending in a radial direction relative to the stator axis and within a circumferential circle defined by a stator diameter, and which is provided with terminal areas for contacting the connecting lead (65) as well as shaped strip conductor guides (14) and strip conductors (6) with terminal lugs (38) for contacting the stator winding. A plug element (10) is provided which can be pre-assembled on the connecting lead (65) and comprises insulation displacement contacts (68) that contact the connecting lead (65). The plug element (10) can be mounted on the wiring plate (4) parallel to the stator axis such that the insulation displacement contacts (68) contact the terminal areas of the strip conductors (6) embodied as contacting sections (32a, 32b).

Method for determination of motor parameters of electronically commutated motors during operation involves motor which has stator with majority of stator blocks and permanent magnetic rotor is cooperating with this stator

Abstract: The method involves a motor which has a stator with a majority of stator blocks and a permanent magnetic rotor is cooperating with this stator, during operation which induces alternating voltage into the stator blocks. A power amplifier is arranged at the stator blocks to control the current supply of the stator blocks. During the operation the energy input to the motor is interrupted whereby the rotor further rotates. Independent claims are also included for the following: (A) Electronic commutator motor; (B) Method for determination of temperature dependent motor parameters and (C) Method for operation of electronically commutated motor.

Method and assembly for balancing a fan

Abstract: Disclosed is a method for balancing a fan by means of a controllable laser which is disposed outside the fan and is configured so as to generate a laser beam (12', 12', 12''). The fan comprises a housing and a rotor (22) which is rotatably mounted therein and is embodied at least in one subarea of the rotor from a material that can be machined by the laser beam (12', 12', 12''). At least one subarea of the fan housing is configured so as to allow the subarea of the rotor to be machined by means of a laser beam (12', 12', 12'') which is emitted by the laser and extends through the subarea of the housing to the subarea of the rotor. The inventive method encompasses the following steps: A) the rotor of the fan is made to rotate (S750), and the unbalance created by the fan is measured in order to determine at least one machining point in the subarea of the rotor for reducing the unbalance (S760); B) the laser is triggered so as to generate a laser beam (12', 12', 12'') such that the same penetrates the subarea of the rotor approximately at the at least one machining point (92) in order to remove material there (S780).

Electronically commutated motor with bearing chamber defined by opposing abutment surfaces

Abstract: An easy-to-assemble electric motor ( 21 ) features an internal stator ( 50 ), an external rotor ( 22 ) having a shaft ( 34 ), which external rotor is configured as a rotor cup or bell ( 24 ) having an outer side and an inner side ( 25 ), a bearing tube ( 70 ) for receiving a bearing arrangement ( 60 ) journaling the shaft ( 34 ), which bearing tube ( 70 ) has a first end portion ( 71 ) facing toward the inner side ( 25 ) of the external rotor ( 22 ) and being formed with an inwardly protruding stop ( 73 ), the bearing tube having a second end portion ( 75 ) facing away from the first end portion ( 71 ) and being joined to a plastic part ( 80 ) that likewise forms an inwardly protruding stop ( 77 ) adjacent a second end portion ( 75 ), the bearing arrangement ( 60 ) being located in the bearing tube ( 70 ) in a chamber defined between said two inwardly protruding stops ( 73, 77 ).

Ventilation system for aircraft has number of air ducts extending between air inlet and respective air outlets, with fan installed in each air duct by which direction and intensity of air flow is controllable

Abstract: The ventilation system (1) for an aircraft has a number of air ducts (21-24) extending between an air inlet (35) and respective air outlets (31-34). A fan (3) is installed in each air duct by which direction and intensity of the air flow is controllable. A control unit (5) is provided which controls the output of the individual fans in accordance with the airflow required at the individual air outlets. At least one of the fans is constructed as an equipment fan.