Abstract: Engine brake clutch device comprising a common system of the electric machine type for transformation of mechanical energy associated with a differential system (27) and with a clutch (28), the unit being placed between the engine and the transmission so as to be able to perform the clutching or the engine braking of the vehicle.

Abstract: A miniature generator includes a cup-shaped supporting shell for fixing a yoke assembly, which supporting shell includes a bearing for a rotary shaft of a permanent magnet rotor. The rotary shaft of the rotor is provided with a worm which drives a worm gear engaging with it.

Abstract: A friction braking system located entirely inside an induction motor of an appliance quickly stops rotation of the rotor in the appliance motor, for example such as a food processor, whenever the A.C. electrical power is turned off. Thus, rotation of any tool being operated in the appliance is quickly stopped, whenever the electrical power is interrupted. The rotor in the induction motor is axially slidably mounted on the motor shaft and is keyed to the shaft for permitting axial shifting displacement of the rotor relative to the stator while preventing any angular displacement of the rotor relative to the shaft. Consequently, the rotor and shaft always turn and stop as a function unit. A friction brake lining is affixed within the motor housing offset from the axis of the motor shaft as far as practicable. A disc brake mounted onto the rotor has an annular friction braking surface positioned for engagement against the brake lining.

Abstract: An electromotive variable-speed and control drive particularly for use in industrial sewing machines comprising a motor capable of continuous drive with a disk flywheel and a brake-coupling unit connected to this motor. Cooling ribs confining cooling channels are disposed at the stator frame to achieve efficient cooling. A disk flywheel in the form of a fan is in the form of an axial-radial blower the suction area of which extends to the coupling surface of the disk flywheel. Furthermore, particularly intensive cooling of the brake end shield is possible.

Abstract: An electromotive variable-speed and control drive particularly for use in industrial sewing machines and comprising a coupling coil casing radially surrounding a coupling-brake disk and a brake coil casing radially relocated towards the center. Both are positioned in the brake end shield. In order to avoid a sticking of the coupling-brake disk with high alternations and a delay of the break-down and build-up of the magnetic fields, a brake coil casing has been relocated radially so near to the center that it is situated within the brake pad in front of the armature ring. On the other hand, there is an undercut and a recess at the coupling coil casing and a recess at the disk flywheel which assures that no axial forces can occur at the radial gaps.

Abstract: A drive unit for adjusting window panes, sunroofs, and seats in a vehicle has a reversible electric motor behind which is inserted a worm gear with a worm shaft. To prevent an undesired or unauthorized adjustment of a motor vehicle part, a brake device is provided. The brake device has a mechanical, one-way brake element with which the worm shaft may be coupled by an axial displacement. In order to reduce the effect of the brake device on the worm shaft when the window pane is adjusted by the electric motor, the brake element is the rotatable part of a rotation limiting device and, in the axial direction, it is supported on a stop.

Abstract: A motor including an electromagnetically actuated friction clutch and friction brake for respectively transferring a driving torque and/or a braking torque to an output shaft. A rigid hub is rotationally fixed on an output shaft of the motor for rotation therewith. A first axially deflectable spring washer is connected to an annular shaped clutch disk, with a second axially deflectable spring washer being connected to a brake disk. The clutch disk and brake disk are axially movable by a magnetic force and are adapted to be pressed against a driving pulley and a braking block respectively. The hub is fashioned as a one piece member and a supporting ring is disposed axially between the clutch disk and the brake disk.

Abstract: A variable speed drive has an asynchronous motor whose output shaft carries a flywheel which is juxtaposed axially with a ferromagnetic disc movable on a spline of an output shaft journaled in a common housing for the flywheel, the disc and at least one electromagnetic coil surrounding the output shaft, located within the parameter of the disc and energizable to control the relative engagement of the disc with a brake ring on the housing and a clutch ring on the flywheel. Vanes on opposite sides of the flywheel induce air to flow axially into the housing through the disc and radially out of the housing for cooling.

Abstract: An electric motor having an electromagnetically operated clutch automatically engageable to lock the motor shaft against rotation in at least one direction. Embodiments are described in which interruption of the power to the motor causes engagement of the clutch and in which application of power to the motor causes disengagement of the clutch. Also disclosed is an automatic sliding door assembly operated by an electric motor having an electromagnetically operable clutch which is engaged on interruption of power to the motor to lock the motor shaft against rotation in one direction.

Abstract: A linear actuator is disclosed which includes a frame, a first lead screw mounted to the frame and adapted for rotation, and a second lead screw mounted to the frame parallel to the first lead screw and adapted for rotation. An actuator block is movably secured to the first and second lead screws and includes an actuator assembly for selectively engaging the first lead screw to move the block in the first direction and an actuator assembly for selectively engaging the second lead screw to move the block in an opposing second direction.

Abstract: An electric motor having an improved braking arrangement is disclosed. The braking arrangement includes a stop pawl armature assembly disposed coaxially upon the rotor shaft of the motor for axial movement with respect thereto in response to the magnetic field created by the stator assembly of the motor. The braking arrangement further includes a stop member disposed on the rotor shaft arranged to normally rotate therewith. The stop member functions in the nature of a slip clutch, and is adapted to cooperate with the armature assembly for effecting braking of the motor. During motor operation, the armature assembly is shifted by the magnetic field of the motor stator assembly so that a pawl portion of the armature assembly is moved out of the rotational path of a lobe portion of the stop member. When the motor is switched off, the pawl portion of the armature assembly is moved into the path of the lobe portion, and is engaged thereby.

Abstract: A stator and a rotor of a step motor are disposed in an axially staggered relationship with each other so that the rotary shaft of the rotor can be freely displaced in the axial direction with respect to the stator. Around the outer periphery of the rotary shaft are formed screw threads so as to be threadedly engaged with a nut provided on a casing in which the stator of the step motor is fixedly mounted. Thereby the rotational displacement of the rotor can be converted into an axial displacement thereof, and thus a minute amount of desired controlled displacement can be realized with the influence of a backlash between the screw threads on the rotary shaft and the nut eliminated by an electromagnetic characteristic of the step motor.

Abstract: The drive shaft of a motor can be coupled to an output shaft by an electromagnetically activated friction clutch. The output shaft can be braked by an electromagnetically activated friction brake. The motor drive shaft rotates at constant speed. The rotary speed of the output shaft is regulated by negative-feedback action to maintain a selected value, by activating the clutch and brake alternately as necessary. The activating signals for the clutch and brake are pulse-width-modulated activating signals. The output shaft can be stopped in at least one predetermined angular position when commanded to do so. The movable parts of the brake and clutch are of minimal mass, and the speed-regulating system includes a speed feedback transducer system of very high resolution.

Abstract: An electric coupling and brake motor comprises a continuously rotating main or drive shaft of the motor and an output shaft coaxially therewith, on which a cylindrical coupling member is coaxially mounted for rotation therewith and axially immovable with respect thereto. A flywheel is mounted on the drive shaft for rotation therewith and axially movable with respect thereto and facing one of the end faces of the coupling member, and a brake abutment member is mounted in the motor housing movable only in axial direction toward and away from the other end face of the coupling member. The motor includes further electromagnet means for selectively moving the flywheel or the brake abutment member in axial direction into frictional engagement with the respective end face of the coupling member to rotate the output shaft together with the drive shaft or to hold the output shaft stationarily during rotation of the drive shaft.

Abstract: The invention provides a quiet, reliable and quick acting "no-back" action for synchronous motors utilizing permanent magnet rotors which have minimum power in self-starting and are prone to be erratic in direction of starting. This fallibility arises at least in part from the expense and difficulty of working to the accuracy which would be required to make the motor less uncertain in starting.