An example electric motor includes a housing, a stator fixed relative to the housing, a rotor, a brake assembly, a first bearing, and a second bearing. The rotor has a hub portion, a cylindrical portion, and a disk portion. The hub portion of the rotor has a first end, a second end, and a through-hole therethrough. The brake assembly is fixed relative to the housing and configured to selectively couple the disk portion of the rotor to the housing. The first bearing is mounted between the first end of the hub portion of the rotor and the disk portion of the rotor. The second bearing is mounted between the second end of the hub portion of the rotor and the disk portion of the rotor.

A gear system includes a gear unit and an electromagnetically actuable brake, the brake having a coil core that is connected to a brake surface part in a torsion-resistant manner. The brake surface part is connected to a bearing flange, its bearing mount in particular delimiting a free space. The bearing flange is connected to a cover part which is connected to a housing part of the gear unit, and a shaft is supported in the housing part via at least one bearing. A driver is connected to the shaft in a torsion-resistant manner, the driver having an external tooth system that is in engagement with an internal tooth system of a brake pad carrier such that the brake pad carrier is connected to the shaft in a torsion-resistant yet axially displaceable manner. An armature disk, which is disposed in a torsion-resistant yet axially displaceable manner with respect to the coil core, is situated between the coil core and the brake pad carrier.

An electric actuator comprises a housing and an output shaft reciprocatingly received by the housing. There is a screw assembly disposed within the housing and coupled to the output shaft. The screw assembly includes a plurality of annular rollers and a central screw received by the annular rollers. The annular rollers are rotatable about the central screw. There is a motor which includes a stator and a rotor. The rotor has an inner bore which engages the annular rollers. Rotation of the rotor causes the central screw to translate axially relative to the rotor and the output shaft to reciprocate relative to the housing.

A rotating body is rotatably supported on a holding section. The holding section includes a rotation detection unit, a torque-applying unit, and a brake-applying unit. The torque-applying unit includes an A-phase torque-applying coil and a B-phase torque-applying coil, and a resistance torque and a pull-in torque applied to a rotor (magnet) are caused to vary as a result of controlling supply of current to each of the coils. In addition, a braking force can be controlled by supplying current to a brake-applying coil included in the brake-applying unit.

An electric motor, e.g., a bearing-free electric motor, includes a rotor and stator. The rotor has a rotor shaft on which a rotor packet is mounted and connected to the rotor shaft in a torsionally fixed manner. The rotor packet includes rotor segments that are stacked on top of one another in the axial direction, and a centering disk as well as a press-fit connection device, in particular a shrink-fit connection device having a shrink disk and compression rings. The stack, which includes the rotor segments, is situated between the centering disk and the press-fit connection device.

A brake assembly comprising: (a) a caliper including: (i) one or more pistons, (b) one or more rotary to linear actuators that provides an axial force to move the one or more pistons, (c) a motor gear unit in communication with the one or more rotary to linear actuators, the motor gear unit including: (i) a motor, and (ii) a motor brake that prevents movement of the motor gear unit, the pistons, or both when the motor is turned off so that the brake apply is maintained, the motor brake including: (1) a rotor that is in communication with the motor, (2) a contact pad that is movable into contact with the rotor to prevent movement of the rotor and the motor, and (3) an electromagnet that is in communication with the contact pad and creates a brake retract,

An electric actuator comprises a housing and an output shaft reciprocatingly received by the housing. There is a screw assembly disposed within the housing and coupled to the output shaft. The screw assembly includes a plurality of annular rollers and a central screw received by the annular rollers. The annular rollers are rotatable about the central screw. There is a motor which includes a stator and a rotor. The rotor has an inner bore which engages the annular rollers. Rotation of the rotor causes the central screw to translate axially relative to the rotor and the output shaft to reciprocate relative to the housing.

In an electric motor having electromagnetically actuatable brake, the brake has a coil received in a magnet body. A brake lining carrier is connected, rotation-fast but axially displaceable, to a rotor shaft of the electric motor, and an armature disk is connected, rotation-fast but axially displaceable, to the magnet body. The armature disk is arranged axially between the brake lining carrier and the magnet body. Springs supported on the magnet body press on the armature disk. A second electromagnet is arranged on the magnet body. A lever is pivotably mounted relative to and/or on the magnet body. The lever is connected to the armature disk, such that in a first rotational position of the lever, the armature disk is pressed towards the brake lining carrier, and in a second rotational position of the lever, the armature disk is kept pulled towards the magnet body.

A robot arm apparatus includes a base structure, a first arm, a first actuator, and an assisting device. The first arm is pivotable relative to the base structure about a first pivot axis. The first actuator is configured to pivotally actuate the first arm relative to the base structure. The assisting device is configured to apply an assist rotational force to the first arm to assist the first actuator.

The disclosure provides a magnetic yoke iron core and a brake including a magnetic yoke iron core, a first movable plate, a plurality of friction disks, at least one second movable plate, a coil, an armature and an elastic part; the first movable plate is located in a first mounting space and close to a first shaft end; a plurality of friction disks are sequentially arranged in the first mounting space along an axial direction of the magnetic yoke iron core and located at a side of the first movable plate close to a second shaft end; the coil is arranged in a second mounting space; the armature is connected with the first movable plate through a connector; the second movable plate is connected with the connector; and the elastic part having a pre-tightening force which enables the armature to be far away from the magnetic yoke iron core.