Showing papers by "ebm-papst published in 2003"

Internal rotor motor

Abstract: A low-ripple multi-phase internal rotor motor has a slotted stator ( 28 ) separated by an air gap ( 39 ) from a central rotor ( 36 ). The rotor has a plurality of permanent magnets ( 214 ), preferably neodymium-boron, arranged in pockets ( 204 ) formed in a lamination stack ( 37 ), thereby defining a plurality of poles ( 206 ) separated by respective gaps ( 210 ). In a preferred embodiment, the motor is three-phase, with four rotor poles and six stator poles. As a result, when the first and third rotor poles are so aligned, with respect to their opposing stator poles, as to generate a reluctance torque, the second and fourth rotor poles are aligned to generate oppositely phased reluctance torques, so that these torques cancel each other, and essentially no net reluctance torque is exerted on the rotor. In order to magnetically separate the rotor magnets from each other, a hollow space ( 224, 238 ) is formed at the interpolar-gap-adjacent end face ( 216, 218 ) of each rotor magnet. A control circuit ( 147 ) provides electronic commutation and current control, based on rotor position signals generated with the aid of a control magnet ( 110 ) on the rotor shaft ( 40 ).

Arrangement and method for removing heat from a component which is to be cooled

Abstract: An arrangement, for heat dissipation from a component that is to be cooled, features: a pump for pumping a coolant, which pump comprises a pump rotor; a fan that comprises a fan rotor associated with which is an electric motor to drive it, the pump rotor and the fan rotor being separated from one another in fluid-tight fashion and drivingly connected to one another via a magnetic coupling. It also relates to a method for heat dissipation from a component that is to be cooled, using a fan that comprises a fan rotor and a drive motor, using a pump that comprises a pump rotor, using a coolant that is pumpable by means of the pump, comprising the following steps: A) the fan rotor has a rotational motion imparted to it by means of the drive motor; B) the pump rotor has a rotational motion imparted to it, via the magnetic coupling, by means of the rotational motion of the fan rotor; C) the coolant is caused to flow by the rotational motion of the pump.

Apparatus for sensing the absolute-value angle of a shaft

Abstract: An apparatus serves to sense the absolute value of the rotational position of a shaft ( 14 ). The apparatus has a first single-turn rotary encoder ( 30 ) that is arranged at one end ( 20 ) of the shaft ( 14 ) and is arranged to sense the latter's rotational position within a single shaft revolution. Also provided are: a multi-turn rotary encoder unit which senses the number of revolutions of the shaft ( 14 ) and which comprises a reduction gear linkage ( 18 ); a rotary element ( 42 ), driven by the output of the linkage, that is oriented as an imaginary continuation of the shaft ( 14 ) and coaxially therewith; and a second single-turn rotary encoder ( 48 ) which is arranged to sense the rotational position of the rotary element ( 42 ) within a single revolution. The reduction gear linkage ( 18 ) surrounds the shaft ( 14 ), and its output element ( 38 ) is connected, via a connecting member ( 40 ), to said rotary element ( 42 ) around the first single-turn rotary encoder ( 30 ). An unusually compact combination motor/encoder unit can thereby be achieved, suitable for installation in small spaces, e.g. a few centimeters wide.

Electronically commutated dc motor comprising a bridge circuit

Abstract: Disclosed is an electronically commutated DC motor comprising a stator which is provided with at least one stator winding (22, 24, 26), a rotor (28) which electromagnetically interacts therewith, a positive and a negative DC line (76, 78) supplying the motor (20) with current, particularly from a battery (77), a full-bridge circuit (74) which controls the current in the at least one stator winding (22, 24, 26) and is provided with a plurality of bridge branches, each of which comprises an upper bridge transistor (66, 80, 86) controlling the current from the positive DC line (76) to a connection (68; 82; 88) that is assigned to said stator winding (22, 24, 26) and a lower bridge transistor (70, 84, 90) controlling the current from the respective connection of the stator winding to the negative DC line (78). The inventive motor also comprises an arrangement generating a plurality of rotor position signals and an arrangement controlling a given bridge transistor by interlinking rotor position signals that are assigned thereto, said rotor position signals being interlinked by a control transistor (60). A first rotor position signal (H1) can be fed to the base of said control transistor (60) while a second rotor position signal (H2) can be fed to the emitter thereof. The collector signal thereof controls the given bridge transistor (66). Also disclosed is a circuit comprising a half-bridge.

Rotor-position sensor assembly and method for detecting a rotor position

Abstract: The invention relates to a method for operating an electric motor comprising a stator, an external rotor (40), the latter (40) having a sensor magnet (54) with a plurality of sensor poles (55), at least one rotor-position sensor (42, 44) that is connected to the stator and a rotor-position evaluation device. The method comprises the following steps: The rotor-position sensor(s) is/are used to generate at least one rotor-position signal that is dependent on the rotational position of the sensor magnet (54). The rotor-position signal or signals is/are fed to the rotor-position evaluation device, where it is or they are converted into at least one digital value with a resolution of at least 2 bits, whereby said signal or signals can also be converted into different digital values dependent on rotational positions inside the sector of the sensor pole. The invention also relates to an electric motor comprising a stator and an external rotor (40), the latter (40) having a sensor magnet (54) with a plurality SP of sensor poles (55), at least one rotor-position sensor (42, 44) for generating a rotor-position signal, a rotor-position evaluation device for generating an absolute value for the rotor position, said device comprising an A-D converter (144) with a resolution of at least 2 bits, the rotor-position sensor or sensors (42, 44) being connected to the A-D converter.

Fan having an integrated ip protection

Abstract: A fan has a fan housing (2), which is provided with a pot-like recess (4), and it has an external-rotor drive motor (103) that comprises an internal stator (22) and an external rotor (34) separated therefrom by an air gap (52). The internal stator (22) is mounted on a bearing supporting tube (24), which is joined to a base part (46), and the assembly consisting of the bearing supporting tube (24) and of the base part (46) form, together with the pot-like recess (4) of the fan housing (2), an annular space (54) that surrounds the internal stator (24, 26) in an essentially fluid-tight manner. A wall (56) of this annular space (54) extends like a slotted tube through the air gap (52) that is situated between the internal stator (22) and the external rotor (34).

Device comprising a plain bearing

Abstract: The invention relates to a device comprising a plain bearing (36), which contains ferromagnetic material and which is provided for radially supporting a shaft (34) that is made of ferromagnetic material. The shaft (34) is mounted in said plain bearing (36) in a manner that enables it to rotate and be axially displaced and has a free end (35). A footstep bearing is provided on the latter, comprises a step rounding (66),which is provided on said free end (35), and comprises a contact element (68, 69) that interacts with the step rounding. This contact element (68, 69) consists, at least in part, of a ferromagnetic material. In addition, at least one permanent magnet (72) is provided, which is placed in the area around the free shaft end (35) between the axial end of the plain bearing (36) at that location and the contact element (68) in order to form a magnetic circuit (82) starting from one pole (74) of the at least one permanent magnet (72) to the other pole (76) of the at least one permanent magnet (72) while passing via the plain bearing (36), the free shaft end (35), the step rounding (66) and the contact element (68). This results in inducing a defined magnetic attractive force between the step rounding (66) and the contact element (68).

Stator for electric motors having a winding interconnection assembly

Abstract: The invention relates to a stator (1) for an electric motor, particularly for a high-performance low voltage motor of the external rotor type. Said stator comprises a stator core assembly (2) with a number of stator slots (6) and stator teeth (4) for accommodating stator windings (8), and an interconnection assembly (20) for interconnecting winding wires (18) of the stator windings (8). The stator windings (8), which are wound around the stator teeth (4) though the stator slots (6) project, on both faces (10, 12), above the stator core assembly (2) with a winding head (16). The interconnection assembly (20) is comprised of winding contact elements (22, 22a, 52) and of interconnection contact elements (24, 54), whereby at least the interconnection contact elements (24, 54) are arranged, on one face (10) of the stator core assembly (2), essentially inside a space, which is limited by the stator windings (8) and by a plane (26) defined by the winding head (16). The winding contact elements (22, 22a, 52) are assigned to the stator teeth (4) or to the stator slots (6) as winding supporting points that are fixed on the stator whereby enabling the stator windings (8) to be wound in a continuous winding process onto the stator teeth (4) and each time with the winding wires (18) via the winding contact elements (22, 22a, 52). Each interconnection element (24, 54) electrically connects a stipulated group (I, II,III; M) of the winding contact elements (22, 22a, 52) to one another.

Electric motor with a high ip-protective system

Abstract: The invention relates to an electric motor (1) comprising a motor housing (2) with a high IP-protective system, also comprising a stator (4) and a pot-type external rotor (6) which encircles the stator (4) on one side as part of the motor housing (2). The electric motor also comprises an electronics housing (16) containing a control electronics system (18) which is embodied as an additional part of the motor housing (2) on an adjacent side which is axially opposite to the external rotor (6). Means are provided for the internal cooling thereof which occurs by means of an internal circulation of air in the region of the stator (4) and/or the control electronics system (18) and, preferably, further means are provided for guiding the internal heat to the outside.

External rotor motor and method for assembling such a motor

Abstract: A method of rapidly assembling the rotor ( 22 ) of an external-rotor motor ( 20 ) onto a bearing support tube ( 70 ) and in a predetermined axial position relative to the latter, which rotor ( 22 ) comprises a rotor cup ( 24 ) and a rotor shaft ( 28 ), includes the following steps: a) beginning at the rotor cup ( 24 ), pre-mounting, onto the rotor shaft ( 28 ), a compression spring ( 48 ), a retaining washer ( 50 ), and a bearing arrangement having a plurality of rolling bearings ( 52, 60 ), the inner rings ( 56, 64 ) of the rolling bearings being slidingly displaceable on the rotor shaft ( 28 ) within a predetermined region; b) pressing the rotor ( 24 ), with the elements mounted thereon, into the bearing support tube ( 70 ) by means of a pressing-in force (K), the compression spring ( 48 ) being compressed so that the rotor cup presses the retaining washer ( 50 ) into the bearing support tube ( 70 ); and c) removing the pressing-in force (K) so that the rotor shaft ( 28 ) is displaced by means of the compression spring ( 48 ) within the inner rings ( 56, 64 ) of the bearings ( 52, 60 ) in such a way that the rotor ( 24 ) assumes the predetermined axial position relative to the bearing support tube ( 70 ). The method is advantageous because the steps are simple enough to be automated, and the structure is advantageous because the closed bearing tube prevents dirt and contaminants from getting into the bearings, thereby extending service life.

Elektromotor mit hoher ip-schutzart

Abstract: Die Erfindung betrifft einen Elektromotor (1) mit einem Motorgehause (2) hoher IP-Schutzart, bestehend aus einem Stator (4) und einem den Stator (4) von einer Seite her als Teil des Motorgehauses (2) topfartig umschliesenden Ausenlaufer (6) sowie einem sich als weiterer Teil des Motorgehauses (2) auf der dem Ausenlaufer (6) axial gegenuberliegenden Seite anschliesenden, eine Steuerelektronik (18) enthaltenden Elektronikgehause (16). Der Ausenlaufer (6) ist uber eine Lauferwelle (12) in einem in dem Stator (4) sitzenden Lagertragrohr (10) drehbar gelagert. Das Lagertragrohr (10) ist einstuckig aus einem gut warmeleitenden Material, bestehend aus einem auf der der Steuerelektronik (18) zugewandten Seite radial nach ausen gefuhrten Ringflansch (22), verbunden. Dieser Ringflansch (22) ist auserhalb des Motorgehauses (2) mit Kuhlrippen (24) versehen, wobei vorzugsweise der Ausenlaufer (6) in seinem dem Ringflansch (22) zugewandten Bereich ein Luftrad (28) mit den Kuhlrippen (24) axial gegenuberliegenden Lufterrippen (30) tragt.

Outer rotor motor with fixed spindle

Abstract: The motor (12) has an inner stator (52) arranged on a stationary carrier part (18) and an outer rotor (49) associated with and rotatable relative to the inner stator and with a casing part (14) on whose inner side a permanent magnet arrangement (50) is mounted that interacts with the inner stator. The carrier part is essentially cylindrical with at least one attached closure element (76,78) with at least one element (90) sealing it against the inner stator.

Control method for brushless electric motor, especially fan motor, in which motor is operated as brushless DC motor during acceleration phase and as synchronous motor during constant speed phase

Abstract: Control method for a brushless electric motor (1), especially a fan motor with a permanent magnetic rotor, a wound stator and a and control circuit for generating a varying stator field. In an acceleration phase the motor is operated as a brushless DC motor with sensor-free rotor position determination and in a stationary phase the motor is operated with a constant speed as a synchronous motor in a network power frequency independent manner with an electronically produced voltage without measurement or consideration of the rotor position. The invention also relates to a corresponding control system for a brushless electric motor.

Heat transfer system for cooling electronic circuit module for a microprocessor, incorporates pump for cooling fluid and fluid to air heat exchanger with ventilation fan remote from circuit module

Abstract: The heat transfer and fluid cooling system (10) has a heat exchanger (20) extracting heat from a circuit module (12). Cool fluid flows through a pipe (32) to a junction (40) and heated fluid flows through a junction (42) to a pipe (23) leading to a fluid-air heat exchanger (28). Air is pushed through the fluid-air heat exchanger by a fan (30) driven by an electric motor which also drives a fluid pump (24). Fluid-tight seals separate the fluid pump from the fan.

Electronically commutated internal rotor motor

Abstract: An electronically commutated internal rotor motor (20) has an outer stator (28) and a permanent magnet rotor (36) arranged rotatably therein by means of a shaft (40) supported at its drive end (42) by a rotary bearing (54) located in the A-side bell (26) and supported at its other end (44) by a rotary bearing (72) located in the B-side bell (66). The rotary bearing (54) in the A-side bell is preferably so configured that it permits a small radial movement (56) of the drive end (42) relative to this bell (26). The rotary bearing (72) in the B-side bell (66) has its outer race (72) tensioned against a shoulder (90, 94). Its inner race (74) is tensioned between a shoulder (78) of the shaft (40) and a shaped part of non-ferromagnetic material. This shaped part is pressed by a countersunk screw (82), screwed into a threaded bore (84) of the other shaft end (44), against the inner race.

Gebläse mit Laminar-Element vor der Ansaugöffnung

Abstract: Es wird ein Radialgeblase (1) mit einem Gehause (2) und einem darin angeordneten Geblaserad (3), einem Lufteinlass (4) und einem Luftauslass (5) angegeben, wobei zwischen letzteren ein Druckraum (6) ausgebildet und vor dem Lufteinlass (4) ein Stromungsgleichrichter angeordnet ist, der in einem darin ausgeformten Bypass (8) einen Sensor (9) zur Erfassung mindestens eines Parameters des durch den Lufteinlass (4) stromenden Mediums umfasst.

Electric fan with strain relief connection

Abstract: A fan has a hub and a fan housing connected to the hub. The fan housing delimits an air passage of the fan outwardly. A fan wheel is connected to the hub and rotatably arranged in the air passage. A motor is arranged on the hub for driving the fan wheel. An electrical connection with at least one flexible line is connected to the motor and extends from the motor to the fan housing. A recess is provided within the fan housing and the flexible line extends from the motor to the recess. A holding member locks in place in the recess and deflects the flexible line at least at one deflection location about a predetermined minimum angle to thereby effect strain relief on the portion of the flexible line extending from the deflection location to the motor.

Fan, in particular for a device

Abstract: The invention relates to a fan which comprises a hub (44) and a housing (22) connected thereto The housing of the fan limits an air passage opening (41) towards the exterior and comprises a radial extension (64) at least at one peripherial point A fan wheel (38) is rotationally mounted in said air passage opening (41) A motor (36) for actuating said fan wheel is arranged on said hub (44) An electric connection extends from the motor (36) to the fan housing (22) and comprises at least one electrical wire (52) A cavity (66) is arranged in the extension (64) of the fan housing (22) and is tangentially extended to the profile of the fan housing (22) The electrical wire (52) leads to said cavity A supporting element (80) is inserted into the cavity (66) and engaged therein In the engaged position said element diverts the electrical wire (52) to at least one point (106, 108) at a predefined minimum angle and reduces the tension of the electrical wire (52) on the side thereof leading to the motor (36) Said supporting element is easily and low costly mountable in such a way that there is no need for passing the electrical wire through the narrow holes

Electronically commutated motor operable directly from AC power network

Abstract: An electronically commutated motor (10) is adapted to be powered directly by an AC voltage (UAC) source, and comprises a permanent-magnet rotor (18), a stator having at least one winding phase (L1, L2, , Ln), a rectifier (38) which generates, from the AC voltage (UAC), a pulsating DC voltage (UB) between a positive lead (30) and a negative lead (32) of a DC link (15) Also present is a bridge circuit (28A, 28B, 28C), connected to that DC link (15) and provided to supply current to the at least one winding phase (L1, L2, , Ln), which comprises a switching element (50) controllable with a control voltage (UST) that is lower than the pulsating DC voltage (UB) to be switched An auxiliary circuit (34, 34′) generates, from the pulsating DC voltage (UB) at the DC link and from the AC voltage (UAC), a control voltage (UST) for driving the switching element (50) that is lower than the pulsating DC voltage by an amount equal to a predetermined value (UΔ) A preferred filter (140) for connection to an AC power grid is described A preferred embodiment of the circuit includes a bridge circuit having a p-channel MOSFET (50) at the positive lead (30) and an n-channel MOSFET (52) at the negative lead (32) of the DC link (15)

Method to reduce the braking time of a motor

Abstract: During operation, three winding branches (WB) for an electric motor (EM) (1) are triggered via three winding connections (U-W) for commutating electronics (CE) (6) so as to generate a magnetic rotary field (MRF). The EM has a stator (2) with the three WB and a permanent-magnetic rotor (4) as well as the CE to trigger WB to generate an MRF so as to drive the rotor. An independent claim is also included for an electric motor with a stator with three winding branches and a permanent-magnetic rotor as well as commutating electronics to trigger the winding branches to generate a magnetic rotary field so as to drive a rotor.

Temperature compensation of a sensor arrangement (gmr) with double-sided potential changes

Abstract: The invention relates to the temperature compensation for a GMR (Giant MagnetoResistive) crossed half-bridge sensor arrangement (39). On a temperature change the potential at the first connector (44) is altered in a first sense, the potential at the second connector (46) undergoes the opposite. The first connector (44) is controlled by means of a PTC (74, 76) and the second connector by means of a constant voltage (P98), from which the PTC voltage is drawn. The sensor arrangement can itself serve as temperature sensor. The direction of a magnetic field from a rotating two-poled magnetic disc (20) is to be recorded. The invention has the advantage of obtaining a range of from 0.3 to 3.5 volts with a constant zero line at 1.9 v for an A/D converter.

Polyphase brushless dc motor

Abstract: Disclosed is a polyphase brushless DC motor (20) comprising a permanent-magnet rotor (28), a polyphase stator (22, 24, 26), and a polyphase full-bridge circuit that is assigned to the polyphase stator (22, 24, 26) and is provided with a plurality of bridge branches, each of which is provided with an upper field-effect power transistor (90, 108, 120) that is connected to a positive line (22) and a lower field-effect power transistor (96, 112, 124) that is connected to a negative line (100). Said motor (20) also comprises a rotor position sensor arrangement (30, 32, 34) which generates a plurality of mutually phase-shifted sensor signals (H1, H2, H3) when the motor (20) is in an operating state, the analogous value of said sensor signals (H1, H2, H3) depending on a rotor position-dependent physical variable that acts upon the rotor position sensor arrangement. Signals (54, 56, 58) that are derived from the rotor position sensor arrangement (30, 32, 34) are compared with a periodic sawtooth signal (u70) so as to obtain a plurality of comparative PWM signals (PWM1, PWM2, PWM3), the pulse duty factor of which is a function of the momentary value of the associated sensor signal (H1, H2, H3). The information contained in a comparative PWM signal is supplied to the two power field effect transistors (90, 96; 108, 112; 120, 124) of an associated bridge branch via one respective driver (86, 104, 116) in the form of signals that are in phase opposition in order to trigger said field effect transistors in a hard chopping mode and allow multiquadrant operation of the motor (20).

Circuit arrangement for electrically isolated signal transmission

Abstract: The invention relates to a circuit arrangement for the electrically isolated transmission of an analog input quantity by means of a signal transmission part, comprising a voltage input and a voltage output and, in particular, for also matching the voltage between the voltage input and the voltage output of the circuit arrangement. The signal transmission part is designed as an inductive signal transmission part (6), and the circuit arrangement is provided with a charging and discharging arrangement having a switching element (S1) so that by actuating the switching element (S1), a charging or discharging current (i1, i2) occurs, which is proportional to an input voltage (U1) and which flows through the signal transmission part (6), and an output voltage (U3) ensues at the voltage output.

External rotor, especially electronically commutated, motor with standing bearing axle, has cylindrical carrier with closure elements with elements sealing it relative to inner stator

Abstract: The motor (12) has an inner stator (52) arranged on a stationary carrier part (18) and an outer rotor (49) associated with and rotatable relative to the inner stator and with a casing part (14) on whose inner side a permanent magnet arrangement (50) is mounted that interacts with the inner stator. The carrier part is essentially cylindrical with at least one attached closure element (76,78) with at least one element (90) sealing it against the inner stator.

Device for measuring the absolute angle of a shaft

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.

Electronically commutated electric motor

Abstract: The motor is supplied from an alternating voltage source and has a stator with at least one winding phase (L1), a rotor that interacts magnetically with the stator, a rectifier that produces a direct voltage between positive (30) and negative (32) lines of an intermediate rectifier circuit from the alternating source voltage, a bridge circuit with a switching element switchable by a control voltage lower than the voltage to be switched and generated by an auxiliary stage (34) from the pulsed DC voltage (UB) and the AC voltage.

Anordnung mit einem gleitlager

Abstract: Es handelt sich um eine Anordnung mit einem Gleitlager (36), welches ferromagnetisches Material enthalt und zur radialen Lagerung einer Welle (34) aus ferromagnetischem Material dient. Die Welle (34) ist in diesem Gleitlager (36) drehbar und axial verschiebbar angeordnet und hat ein freies Ende (35). An letzterem ist ein Spurlager vorgesehen, welches eine an diesem freien Ende (35) vorgesehene Spurkuppe (66) und ein mit letzterer zusammenwirkendes Anlageglied (68, 69) aufweist, welches zumindest teilweise aus ferromagnetischem Material besteht. Ferner ist mindestens ein Dauermagnet (72) vorgesehen, der im Bereich um das freie Wellenende (35) zwischen dem dortigen axialen Ende des Gleitlagers (36) und dem Anlageglied (68) angeordnet ist, um einen magnetischen Kreis (82) vom einen Pol (74) des mindestens einen Dauermagneten (72) uber das Gleitlager (36), das freie Wellenende (35), die Spurkuppe (66) und das Anlageglied (68) zum anderen Pol (76) des mindestens einen Dauermagneten (72) zu bilden und dadurch eine definierte magnetische Anziehungskraft zwischen der Spurkuppe (66) und dem Anlageglied (68) zu bewirken.

Method for commutating an electronically commutated motor and motor for carrying out said method

Abstract: Disclosed is a method for commutating an electronically commutated motor (20) having a positive (34) and a negative connection line (36), a stator comprising at least one phase winding (22), a permanent-magnetic rotor (26), a rotor position sensor (28) for the production of a rotor position signal (u1, u2), a full bridge circuit (78) which is associated with the winding phase (22) and which has upper transistors (70, 72) embodied in the form of MOSFETs controlling the connection of the at least one phase winding (22) to the positive connection line (34) and which has lower transistors (74,76) embodied in the form of MOSFETs which are complementary to the upper transistors, controlling the connection of the phase winding (22) to the negative connection line (36). Two complementary MOSFET transistors are series connected in each branch of the bridge and a comparator (90, 92, 90', 92') is associated with each MOSFET transistor of the bridge circuit (78) for the control thereof. The MOSFET transistor of a branch of the bridge, which is to be disconnected after a predefined modification of the rotor position signal (u1, u2) in a manner controlled by said signal modification, is disconnected by means of the comparator associated therewith.During disconnection, the gate potential of the MOSFET transistor which is to be disconnected is monitored by the comparator associated with said MOSFET transistor to be disconnected. Once the monitored gate signal reaches a value which is characteristic for disconnection of the transistor which is to be disconnected, said MOSFET transistor to be disconnected is disconnected by the capacitor associated therewith.

Vorrichtung zum Erfassen des Absolutwinkels einer Welle

Abstract: Eine Vorrichtung dient zum Erfassen des Absolutwerts der Drehstellung einer Welle (14). Die Vorrichtung hat einen ersten Singleturn-Drehgeber 30, der an einem Wellenende (20) der Welle (14) angeordnet und dazu ausgebildet ist, deren Drehstellung innerhalb einer einzigen Wellenumdrehung zu erfassen. Ferner ist eine Multiturn-Drehgebereinheit vorgesehen, welche die Zahl der Umdrehungen der Welle (14) erfasst und welche ein Untersetzungsgetriebe (18), ein von dessen Abtrieb angetriebenes Drehelement (42), das in einer gedachten Verlangerung der Welle (14) und koaxial zu dieser angeordnet ist, und einen zweiten Singleturn-Drehgeber (48) aufweist, der dazu ausgebildet ist, die Drehstellung des Drehelements (42) innerhalb einer einzigen Umdrehung zu erfassen. Das Untersetzungsgetriebe (18) umschliest die Welle (14). Sein Abtrieb (38) ist uber ein Verbindungsglied (40) um den ersten Singleturn-Drehgeber (30) herum mit dem genannten Drehelement (42) verbunden.

Connector for the electrical connection of the stator windings of a motor with outer rotor

Abstract: of EP1126580An electric motor, especially an outside rotor motor, has a rotor (1), a stator (2) and an apparatus unit (4) contacting electrical connections of windings (3) of the stator via plug connections. This can be fastened to a front side of the electric motor via catch connections which are formed from catch elements (12) corresponding to one another. The apparatus unit is designed in two-part fashion. It consists of a flange part (5) that can be locked in catch fashion onto the stator and a switch disc (6) contacting the electrical connections of the windings of the stator via the plug connections.