Abstract: An electromechanical actuator maintains an external device to which the actuator is connected at an operating position when power is applied to the actuator, and allows the external device to return to a default position when the power is removed. Included in the actuator is a housing and an output coupling rotatably mounted thereon. The output coupling is configured to be connected to the external device and displaces the external device between the operating position and the default position. A driving device is mounted in the housing for providing a torque to the output coupling to displace the external device between the default position and the operating position when the driving device is energized. Also provided is a torque transmitting device for transmitting and changing the torque from the driving device to the output coupling. The torque transmitting device is cooperatively engaged to and is located between the driving device and the output coupling.

Abstract: An autonomous generation brake having a dynamo, following rotation of a first rotor of an annular magnet in the core area an even number of armature coil with alternating polarities inside the first stator on the outer periphery are induced to produce an alternate current potential to be rectified at a rectifier wherefrom rated direct current is delivered to stimulate respective magnetic coils on the second stator of a braking device enclosing the dynamo; the second stator clamping internally a second rotor of a metal checked heat diffusion ring so that once the second rotor turns in rotation and respective magnetic coil on the second stator are stimulated, the interrelated movement occasioned thereby will induce a vortex upon the second rotor, meantime produce a braking torque sufficient to rapid diffusion of magnetically induced heat as well as the braking heat. Magnitidue of the direct current outgoing from the rectifier maybe regulated by a pulse regulator.

Abstract: An electric motor assembly has an inner-rotor configuration including a hollow space within the rotor hub. The hollow space houses at least part of a brake for providing a braking force between a rotor and a stator of the electric motor. The brake can be configured to provide a braking force when no power is flowing to the electric motor, and can have an outer diameter less than an inner diameter of the rotor.

Abstract: The invention relates to an electric motor having a locking device and a brake actuator for an electric system which includes such an electric motor. The locking brake has a simple configuration and includes a conical ring which is mounted so as to be axially displaceable on the motor shaft of the electric motor of the brake actuator. In a first axial position, the conical ring (26) permits a rotation of the motor shaft (12) in both directions and, in a second axial position, the conical ring is in engagement with the motor shaft (12) and rotates with the latter. In the second axial position of the conical ring (26), a rotation of the motor shaft (12) in one rotational direction leads to the situation that the conical ring (26) is in engagement with the lock ring (24) of the brake actuator (2). The lock ring (24) is fixed so that it cannot rotate relative to the motor shaft (12).

Abstract: An electric motor assembly includes an output shaft with a fixed large gear, a driving shaft with a fixed small gear, a motor for rotating the driving shaft, and a gear box. The gear box includes a housing and a reduction gearing, which is disposed within the housing. The gearing includes a plurality of speed-reducing members, each of which includes a rotating shaft journalled in the housing, a large gear sleeved fixedly on the rotating shaft, and a small gear sleeved fixedly on the rotating shaft and with a tooth number and a diameter that are smaller than those of the large gear. The large gears of the output shaft and the speed-reducing members mesh respectively with the small gears of the driving shaft and the speed-reducing members. One of the large and small gears of the speed-reducing members has a side surface.

Abstract: A drive device for an electrically operated vehicle, in particular a wheelchair, having at least one rim with rim well and an axle shaft wherein a brake is integrated into an annular channel formed between the rim and the axle shaft.

Abstract: An adjustable coupler has a group of magnet rotors separated by air gaps from a group of conductor rotors. The air gaps are adjusted by axial movement of one of the groups relative to the other to vary the slip of the coupler and achieve a constant load speed at various load torques.

Abstract: A positive locking device is provided in order to prevent a motor from rotating after power has been removed. The positive locking device has a plate mounted on the motor which engages a disk or hub on the shaft of the motor. In another aspect of the invention, solid state circuitry for switching a permanent magnet motor and providing dynamic braking thereto is provided. The circuitry allows the back EMF generated by the armature coils of a permanent magnet motor to cause a current to flow through the motor when power is removed. This back EMF may be used to help produce smooth engagement of the locking device. In another aspect of the invention, a dynamic braking circuit for a dual armature permanent magnet motor is provided. By applying current to one or the other of two oppositely wound armature coils the motor is made to rotate in either direction. When power is removed from the active armature, this armature is short-circuited through a diode.

Abstract: Projecting into a brake drum is an annular guide frame defining an annular inner chamber of rectangular shape in section, having an outer wall portion formed by a thin cylindrical body of nonmagnetic material, and an inner annular wall of ferromagnetic material. An annular magnet support member is axially movable within the inner chamber of the guide frame, and supports a plurality of permanent magnets disposed closely adjacent to the cylindrical body and in circumferentially spaced apart positions of uniform pitch, the polarities of the permanent magnets alternating circumferentially.

Abstract: An electric drive for small vehicles, especially wheelchairs, includes a d.c. motor, which is arranged as a wheelhub motor in the running wheel of the small vehicle. Efficiency and manufacturing costs are improved, while ensuring simple assembly, wherein the possibility of automatically locking the running wheels is provided, along with a short and lightweight design. The d.c. motor is an external rotor motor, whose external rotor forms the wheelhub or the wheel rim of the running wheel. The stator of the d.c. motor is stationarily connected to the small vehicle via a brake housing (3). A central spring pressure brake is provided which can be released electromagnetically and manually and brakes the external rotor of the d.c. motor in the case of a power failure.

Abstract: A park brake apparatus for a vehicle electric brake comprises an electric motor having a rotational output shaft coupled to a brake mechanism. Rotational movement of the electric motor in a first direction causes application of brake force in the brake mechanism and rotational movement of the electric motor in a second direction opposite the first direction causes release of brake force in the brake mechanism. An armature for the electric motor includes a plurality of radially extending armature arms. A solenoid has a plunger movable between extended and retracted positions. In the retracted position, the plunger is free of the radially extending armature arms and the armature spins free of the plunger. In the extended position, the plunger engages the radially extending armature arms, locking the armature in place and maintaining a park brake state.

Abstract: The invention is directed to a brake actuator (2) having a transmission including an electric motor (6) as a drive element, a converting device for converting the rotational movement of the electric motor (6) into a linear movement and a hydraulic transmission (16, 18, 20) for transmitting the linear movement of the converting device to a friction lining (22) of a brake. The brake actuator of the invention does not require a mechanical transmission connected between the motor and the hydraulic transmission. This is achieved with a converting device configured as a spindle unit (12, 14) and is realized in that the spindle nut (12) is fixedly connected to the electric motor (6) and the spindle rod (14) is fixedly connected to a first hydraulic piston (16) of the hydraulic transmission (16, 18, 20). The electric motor is provided with a hollow shaft (10) for accommodating the displacement stroke of the spindle rod.

Abstract: A magnet section is constructed by installing a coil (2) on a yoke (1), and an armature (3) is placed facing the attracting surface of this magnet section. Indentations and projections are formed to confer the characteristics of both an opposing type electromagnet and a plunger type electromagnet on the magnetic path portion that faces yoke (1) and armature (3). By doing this, the attractive force characteristics will be uniform, and the operating speed and the holding position of the armature can be set as desired by adjusting the magnetization. Thus, the force of impact can be lessened by deceleration control of the armature, and the impact noise can be reduced. In a further aspect, a thin, single sheet annular, noise-damping waveform spring (6) is attached to the outer edge of the attracting surface of the magnet's yoke (1) or armature (3).

Abstract: An actuator lever 3 has one of its opposite ends fixedly mounted on an output shaft 4 which extends upward from an upper surface 2a of an actuator casing 2. The other end of the actuator lever 3 has its lower surface fixed to a stopper 8. In operation, the stopper 8 abuts against a vertical barrier 6a in a shoulder portion 6 of the actuator casing 2 to define a start position or origin of rotational motion of the actuator in its return stroke.

Abstract: A power transfer assembly has a magnet rotor with permanent magnets co-acting with a pair of electroconductive rings on a conductor rotor. The rotary axes of the two rotors are in laterally spaced parallel relation with one of the rotors being greater in diameter than the other.

Abstract: A conductor rotor presents a pair of electroconductive rings spaced apart to receive magnet carrying shoes with permanent magnets to induce eddy currents in the rings and thereby retard rotation of the conductor rotor. The shoes are moved in and out in a controlled manner to move between a retracted brake-off position and an extended brake-on position.

Abstract: A ring rotor is supported free to rotate in a housing, and a plurality of magnets are provided on the inner circumference of the ring rotor having their N and S poles oriented alternately. A stator is fixed to the housing on the inner side of the ring rotor, this stator having a plurality of coils. A switch is provided in the energizing path of the coils, and a mechanism for stopping the ring rotor at a predetermined rotation position is also provided. When one of the coils is energized via the switch, the ring rotor is caused to rotate, and is then held by the stop mechanism. Since the coils are not energized after the operation, power is economized, and burning of the coils is prevented.

Abstract: A ring rotor wherein two magnets of different polarities are disposed in an annular fashion, is supported free to rotate on a base. Two stator coils fixed on the base face these magnets inside of this rotor. Also provided are a switch fixed for selectively energizing these coils, and a mechanism for holding the ring rotor in a predetermined rotation position. Due to the use of magnets for the rotor, brushes are unnecessary, and the ring rotor can be held in a stop position by the holding mechanism.Througholes connecting the inside of the housing and the outside of the housing base are provided in a boss projecting from the base towards the inside of the housing. Grooves are formed from the opening position of the throughole in the base to the side walls of the housing. Bends are provided in these grooves. Leads running from outside into the housing are guided inside the housing via these grooves and througholes. Leads are fixed by filling the grooves and througholes with a filler.

Abstract: An electric drive with brakes, in particular for hoists, lifting devices or positioning transporting systems, having a brake disk which is movable axially on a motor shaft so as to rotate therewith via a toothing. The brake disk has brake faces at both sides and can be pressed against a stationary counter-brake disk by a spring force. An electromagnetic device is provided which, when connected to current, causes the brake to be released against the spring force. The electromagnetic device has a.c. magnets and E-shaped magnet coil yokes. The counter-pole faces associated with the coil yokes are arranged at magnet yokes which can move angularly on all sides so that the counter-pole faces can be aligned at the end faces of the E-shaped magnet coil yokes located opposite thereto when current is applied to the a.c. magnet.

Abstract: Compressed air is introduced into a cylinder chamber to displace a piston closely to a target position. Then, a ball screw shaft is rotated about its own axis by an electric motor to inch the piston to the target position. Upon arrival of the piston at the target position, the ball screw shaft is stopped by a brake mechanism to hold the piston accurately in the target position. The drive shaft of the electric motor extends parallel to the ball screw shaft, thus reducing the entire length of a servo cylinder apparatus. Solenoid-operated directional control valves, for supplying compressed air to the cylinder chamber and the brake mechanism are coupled integrally to a cylinder assembly, so that pipes are shortened for allowing the piston to be displaced and stopped quickly and accurately.

Abstract: A dynamoelectric machine of the present invention includes a stator, a rotor journaled with respect to the stator, and a rotor shaft having a longitudinal axis extending axially from said rotor. An auxiliary winding and a starting switch operable to de-energize said auxiliary winding upon the motor obtaining a predetermined speed is provided. A centrifugal actuator is mounted on the rotor shaft to actuate the starter switch to de-energize the starter windings when the rotor obtains a predetermined speed. The rotor shaft has a single wide groove formed thereon and the actuator has a sleeve which is journaled on the rotor shaft. The sleeve has an inwardly directed projection sized and shaped to fit in the shaft groove. The sleeve projection and shaft groove interact such that the actuator sleeve cannot be moved relative to the shaft and the switch without a great deal of force.

Abstract: A rotation detecting device for vehicle speedometers includes a housing, a magnetic induction device, and a magnetized rotor near the magnetic induction device. The rotor is connected through a coupling to a rotation source. A braking device forms a magnetic circuit between one end surface of the rotor and the housing, and brings the rotor into pressure contact with the housing by a magnetic attraction force generated in the magnetic circuit. Accordingly, a stable and proper braking torque can be applied against rotor vibration, to prevent a false output signal while idling. Furthermore, the amount of wear of a bearing for rotatably supporting a rotating shaft of the rotor can be reduced to improve durability of the rotation detecting device by reducing the braking torque during high-speed rotation of the rotor.

Abstract: A brake device comprises a stack of friction plates (6,7) compressible to have a braking effect between an armature (9) and a magnet structure (10,) the structure including a permanent magnet (11) urging the armature towards the magnet structure to effect braking, and an electromagnet (12) energizable to augment the effect of the permanent magnet, or to oppose it either partially or completely so as to release the braking effect.

Abstract: A universal motor comprises an armature 13, brushes 15, 17 and stator or run windings 19, 21. To provide a permanent magnet actuated dynamic brake circuit 22, permanent magnets 23, 25 are located, respectively, in opposed stator poles 27, 29. In the run mode, power is supplied to stator windings 19, 21 from a rectified ac power supply 33, 35. In the brake mode, brake circuit 22 is actuated by short circuiting armature 13. Due to back EMF, the current flows through armature 13 in a direction opposite to that produced by the rectified ac input in the run mode to provide dynamic braking. To precisely and durably mount magnets 23, 25 in stator poles 25, 27; straps 69, 71 extend around and completely entrap magnets 23, 25 in slots 65, 67.

Abstract: The rotor of a shaded-pole motor carries a braking ring with a radially projecting stop lug adapted to coact with a pivoted pawl to brake the rotor to a stop when the motor is de-energized. The pawl carries a pole piece which, upon energization of the motor, is magnetically attracted toward the stator thereof to cause the pawl to pivot to a released position clear of the stop lug. The braking mechanism requires relatively few components, and those components may be used universally either with a motor with a clockwise rotatable rotor or a motor in which the rotor rotates in a counterclockwise direction.

Abstract: The present invention includes an improvement to a conventional explosion-proof electric brake motor having a motor housing, an electrical conduit attached thereto, a brake housing secured to the motor housing and having an electrical attached to the brake housing, a flange secured to the motor housing and adapted to secure the motor to a drive mounting for driving a shaft. The improvement comprises a first housing waterproof means inserted between the motor housing and the brake housing. A first conduit waterproofing means is adapted to seal the brake electrical conduit to the brake housing. A second conduit waterproofing means is adapted to seal the motor electrical conduit to the motor housing. A flange waterproofing means is adapted to seal the flange to the motor housing. Thus, the conventional electric brake motor and the waterproofing means form a submersible, explosion-proof brake motor.

Abstract: The present invention provides an internal braking system for use with electric motors, particularly electric motors used with rotary actuators. The braking system includes a brake which has a spindle disposed at least partially between the rotor and a shaft. An annular engagement portion of the brake is integrally connected to the spindle through a conical portion. The brake is forced against a stationary friction member when the motor is de-energized. The brake is preferably made from a polymeric alloy having self-lubrication properties.

Abstract: The electrically motorized wheel assembly comprises a hollow shaft having a first opening at one end thereof and a second opening, the first opening receiving conductors from outside of the assembly; a stator coaxial with and fixedly attached to the shaft, the stator being provided with a hollow portion and coils; a rotor coaxial with the stator and mounted for rotation about the stator; and converting system for converting an input electrical current to the variable AC electrical current, the converting system including power electronics fixedly mounted within the hollow portion, input terminals for receiving the input electrical current and output terminals for delivering the variable AC electrical current; whereby, to provide the variable AC current to the coils of the stator.

Abstract: The present invention provides an internal braking system for use with electric motors, particularly electric motors used with rotary actuators. The braking system includes a brake which has a spindle disposed at least partially between the rotor and a shaft. An annular engagement portion of the brake is integrally connected to the spindle through a conical portion. The brake is forced against a stationary friction member when the motor is de-energized. The brake is preferably made from a polymeric alloy having self-lubrication properties.

Abstract: An electromagnetically operated brake with an armature plate (7) axially movable between a magnet body (2) of an electromagnet (1) and a brake disk (8) is proposed. For reducing operating noise, a metallic damping disk (9) with a plurality of elevations (10) is positioned between the armature plate (7) and the magnet body (2).

Abstract: This invention provides a rotary indexing device which applies a uniform pressing force radially on a rotational shaft without applying any force axially thereon.

Abstract: An apparatus for routing a passageway in a conduit includes an elongate cable for direction into a conduit passageway. A cable supply drum contains a supply of the cable and is rotatable about an axis, there being a length of the cable projecting to outwardly of the drum. A motor selectively imparts rotation to the drum about the axis. The cable and drum are configured such that the projecting length of cable rotates about its length as an incident of the drum being rotated about its axis. A brake is provided for stopping rotation of the drum and thereby rotation of the projecting length of cable so as to prevent torquing of the projecting length of cable as when the projecting length of cable is prevented by freely rotating by an obstruction encountered in a conduit passageway.

Abstract: The present invention provides an improved electric drum brake (10). The electric drum brake (10) utilizes vibration absorbing mount (27) for positioning an electro-magnet (24) on the tang (22) of an actuating lever (21). The vibration absorbing mount (27) prevents metal-to-metal contact between the tang (22) and the electromagnet (24) and eliminates or greatly reduces road vibrations.

Abstract: A dynamic braking means for a variable speed dynamoelectric eddy current drive consists of an ac motor (4) rotationally coupled through a shaft (6) to an inductor drum assembly (13) of an eddy current coupling (3), where an annular field coil 12 generates an electromagnetic field which couples the inductor drum assembly to a pole assembly (10) which is rotationally coupled to an output shaft (16) which drives an inertial load (20). Upon command to stop and brake, a controller (30) signals a motor switch (26) to disconnect the ac motor from the ac source and connect it to a dc source, causing a braking torque to be produced. Concurrently, the controller signals a coupling switch (28) to go to an open position momentarily until the motor decelerates to approximately zero speed, whereupon the coupling switch is again closed, coupling the inertial load to the motor, thereby providing a braking action.

Abstract: A device for increasing the magnetic axial force of the displacement type armature motor in motors is provided. The device comprises an iron ring (10) furnished with an outer chamfer (11) matching with the conical course of the rotor (6). The spring-loaded pretensioning of the iron ring (10) suffices for the attachment of the brake support casing (7) on the support ribs (8). The iron ring can be permanently and reliably attached to the rotor motor at low expenditure.

Abstract: A magnetic brake provides braking or locking capability and is remotely controlled by electric power. The magnetic brake comprises a rotatable shaft and a brake disc mounted on the shaft. A non-rotating core housing assembly located around the shaft includes a permanent magnet and a bipolar solenoid. A magnetic armature adjacent to the core housing assembly is capable of movement toward the core housing assembly and toward and into engagement with a brake disc to prevent rotation of the shaft. A spring urges the armature away from the core housing assembly and into engagement with the brake disc. The brake does not use any electric power to maintain the brake in the set mode with the rotating shaft fully locked, or in the released mode with the rotating shaft fully released. The permanent magnet is of sufficient strength to hold the armature against urging of the spring until an opposite polarity is supplied by the solenoid.

Abstract: An electric motor having a design rotational direction when electrically energized and an anti-rotation mechanism to prevent reverse rotation due to external loads when the motor is de-energized which reverse direction could otherwise continue when the motor is energized. The mechanism includes elements that are displaced from contact with one another when upon energization the rotor assumes a magnetic center relative to the stator and that interengage to prevent reverse rotation upon motor de-energization and displacement of the rotor from the magnetic center position.

Abstract: The synchronous motor includes at its rotor a thin-walled cylindrical cup member. This cup member includes at its outer side a plurality of rings which are electrically insulated against each other. A plurality of rod shpaed permanent magnets are in turn arranged at the surface of the rings and extend parallel to the rotor axis. Preferably a braking unit is located at the inside between the inner side of the cup and the rotor shaft which unit act as a standstill brake.

Abstract: A scrolling display device which includes a first roller mechanism and a second roller mechanism opposed to each other with a web display extending between the roller mechanisms. A first motor drivingly engages with the first roller mechanism to rotate the first roller mechanism and wind the web thereupon. A second motor drivingly engages with the second roller mechanism to rotate the second roller mechanism and wind the web thereupon. A first brake mechanism is provided for the first motor and a second brake mechanism is provided for the second motor.

Abstract: A series electric motor having at least one field winding on its stator and a rotor fed through a commutator and brushes, and a device for short circuiting the rotor. Between the stator and the rotor there is at least one permanent braking magnet attached to the stator. When the short circuiting device is put into operation, the permanent magnet field to drive the braking current is strictly predetermined so that a braking effect may cause no additional or harmful sparking at the brushes. The entire braking energy is then directly converted in the motor rotor and there is no necessity for an additional electronic regulating device for the braking current.

Abstract: An automatic washer is provided with a separate motor to drive the drain pump, the motor having a displaceable stator portion connected to the basket brake mechanism such that when the pump motor is energized the basket brake will be released. Such a construction obviates the need for a separate component such as a solenoid to deactivate the brake mechanism. The stator portion is displaceable perpendicularly to the rotor axis and can move either in a radial sliding manner or can be pivotally mounted so as to move through an arc relative to the rotor.

Abstract: A direct drive type rotation dividing table includes a dividing table mounted on an output shaft of a rotor which is accommodated in a housing together with a stator. A clamp mechanism for maintaining the dividing table at a stopped position includes a cylinder slidably disposed in the housing in an axial direction and having a radially extending plane portion and a friction surface adapted to contact the output shaft, an elastic member having one end connected to the housing and urging the friction surface of the cylinder to move away from the output shaft, and a piston having an elastically deformable thin plane portion opposing the plane portion of the cylinder and having one side fixed to the housing and the other free end slidable on the inner surface of the slider. The piston has a friction surface which is adapted to contact a backside of the dividing table.

Abstract: In a stopping device for a shaft, which acts in all three dimensions and is unaffected by large accelerations, a gear on the shaft of an engine is stopped by a locking pawl which engages the gear when the electromagnet is not excited. A magnetic field generated by the passage of current through a coil produces a torque which turns the rotating armature against the force of a spring in such a way that the locking pawl is moved radially outward around the gear and over a guide pin on the rotating armature which can be moved in a guide slot of the locking pawl, and thereby releases the gear and hence the shaft.

Abstract: A variable braking force electric brake for materials handling vehicles, such as fork lift trucks, utilizes two sets of springs to urge brake pads against a rotor of a disc brake. The first set of springs provide a first level of braking force, typically one-third of the total braking force. The second set of springs provide a second level of braking force, typically two-thirds of the total. A pair of electromagnetic elements act on armatures placed between the springs and a non-magnetic brake pad support plate to selectively permit either the first set of springs alone to provide braking, the second set of springs alone, or both sets together. Initially, the current to the electromagnetic elements is strong, to insure that the associated armature is pulled toward the electromagnet, and afterwards, the current is reduced to minimize heating and power requirements.

Abstract: A stationary brake member (45) which is used in an electromagnetic brake apparatus, comprises a first press-worked plate (45h) and a second press-worked plate (45m) which are laminated to each other. The second press-worked plate (45m) has plural hooks (45q), (45s) to grip the first press-worked plate (45h). The first press-worked plate (45h) has plural projections (45k) with spaces (45t) therebetween, and the projections are buried in the cast bracket (31), whereby the first press-worked plate (45h) is firmly fixed to the bracket (31).

Abstract: A braking device for a rotary motor includes a braking member movably mounted to a non-rotating member of the rotary motor. The braking device further includes a compression spring coupled to the braking member for exerting a force on the braking member to cause the braking member to contact a rotating member of the rotary motor. The braking device further includes a piezoelectric element for actuating in response to a signal applied thereto to exert a force on the braking member to counteract the force applied to the braking member by the compression spring so as to cause the braking member to separate from the rotating member of the rotary motor.

Abstract: An eddy current type brake system adapted to a vehicle comprises a drum-like rotor mounted on an output shaft of a transmission of the vehicle, a stator provided in the rotor and being able to reciprocate in an axial direction of the rotor, a plurality of permanent magnets mounted on the stator, a brake force producing device provided between the stator and the rotor for magnetically connecting the permanent magnets of the stator with the rotor to apply brake force to the rotor, and a device for magnetically cutting the permanent magnets of the stator from the rotor to release the brake force from the rotor. When the stator is moved to a position to face the brake force producing device, the permanent magnets of the stator are connected to the rotor magnetically and the eddy current is produced in the rotor so that the rotating shaft is decelerated.

Abstract: A displacement armature motor is formed such that the deformation element allows a larger axial shifting and displacement path of the displacement armature while requiring a lower construction precision. The deformation element includes two frames (17, 17a). The frame (17a) is connected via two of its corner attachment positions (17b) to an attachment plate (19). The attachment plate (19) is connected to an extension (31) of the displacement armature. The frame (17) is connected with two of its attachment positions to the carrier arms (15a) of the support ring (15). The two frames (17, 17a) are connected to each other with their respective remaining corner attachment positions (17c) via a transfer element (18).

Abstract: In a planar linear pulse motor, the relative movement between the stator and the armature is positively restricted when no electric current is supplied to the drive coils by means of a lock member provided on either the armature or the stator. This lock member is attracted to a permanent magnet by its biasing magentic flux so as to be brought into contact with whichever of the armature or stator does not have the lock member on it. As a result, the armature may be locked up without consuming any electric power. If the lock member is attached to the stator or armature by means of an elastic member, the vertical dimension of the member attaching the lock member to the stator or armature can be reduced. Furthermore, the mechanical strength and the security of the engagement of the lock member to the stator or armature can be increased. As a result, the planar linear pulse motor disclosed is compact and highly reliable.

Abstract: A servo control device comprises a motor and continuously acting friction device, which is coupled to the output shaft of the motor and arranged in a housing having an aperture through which the motor output shaft extends. The housing is mounted so as to float radially in a mounting which is provided for it in a casing. Resilient tongues are provided so as to act between the housing and the mounting. The invention is particularly applicable to the motorized servo control of a clutch.