An electromagnetic braking device includes a brake disk, a fixed disk, an armature, a biasing member for biasing the armature, and a stator for attracting the armature. In a stator magnetic circuit member, a first yoke, a permanent magnet, and a second yoke are arranged in this order from one end to the other end of a U shape. In a rotatable state or a rotation braking state, even when the coil energization is OFF, the rotatable state or the rotation braking state is maintained. When a current of a predetermined magnitude flows through the coil in a first direction in the rotatable state, the state shifts to the rotation braking state, and when a current of a predetermined magnitude flows through the coil in a second direction in the rotation braking state, the state shifts to the rotatable state.

One aspect of the present disclosure provides a battery-powered wheelbarrow including a battery housing, a motor, a wheel, a drive circuit, and a control circuit. The control circuit activates, during a drive requirement of the motor not being satisfied, dynamic braking. The control circuit decreases the dynamic braking through the drive circuit in accordance with a lapse of time in response to a first transition having occurred or occurring.

The present invention relates to an electronic braked-integrated in-wheel motor driving device. According to one embodiment of the present invention, an apparently complicated driving device structure, which is formed due to the installation of a brake, can be avoided, and a product appearance of a wheel-chair, to which the in-wheel motor driving device is applied, can be simplified, whereby the driving device improves the visual appearance as well as the brake function and can thus enhance production competitiveness.

An electric motor assembly includes an outer rotor motor, a sensor, and a brake assembly. The outer rotor motor includes a stator and a rotor. The rotor at least partly circumscribes the stator and is rotatable relative to the stator about an axis. The rotor includes a rotor core extending radially outwardly to present axially opposite first and second sides, and a plurality of magnets supported relative to the rotor core. The sensor is operable to sense a condition associated with the electric motor assembly. The brake assembly is operably coupled to the rotor core to selectively reduce the rotational speed of the rotor. The brake assembly is positioned at least partly axially outward from the first side of the rotor core, and the sensor is positioned at least partly axially outward from the second side of the rotor core.

Easily suppress the adherence of metal powder to a motor shaft while suppressing costs. A motor with an electromagnetic brake 1 having: a motor 10; a motor shaft 20 rotated by the motor 10; a bearing 31 that supports the motor shaft 20 to be able to rotate; an electromagnetic brake 40 that brakes the rotation of the motor 10; and an encoder 50 that measures the rotation angle of the motor 10, wherein the bearing 31 is arranged farther to the motor 10 side than the electromagnetic brake 40 in the axial direction of the motor shaft 20, and when the maximum value of the magnetic flux density in the magnetic flux flowing in the electromagnetic brake 40 is A teslas, the electromagnetic brake 40 and the motor shaft 20 are arranged separated by A × 0.3 mm or greater.

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.

A braking mechanism for an electric motor includes an electromagnet configured to be selectively energized in response to a control signal. The braking mechanism also includes a first braking member coupled for co-rotation with an output shaft of the electric motor. The first braking member is configured to movable relative to the output shaft between a first position and a second position. The braking mechanism also includes a second braking member rotationally fixed relative to the first braking member. When the electromagnet is energized, the electromagnet causes the first braking member to move from the first position to the second position. The first braking member engages the second braking member to brake the electric motor in one of the first position or the second position.

A control device controls non-excitation-actuated electromagnetic brake operation. The control device includes an electronic component having a characteristic that when an inter-terminal voltage of two electrodes is equal to or higher than a predetermined voltage, a resistance value is lower than when the voltage is lower than the voltage and a diode disposed such that a cathode is on a side having a higher potential than an anode. The coil in the non-excitation-actuated electromagnetic brake and the electronic component are connected in series to form a first series circuit, the first series circuit and the diode are connected in parallel, and the electronic component is connected in series with the coil provided in the non-excitation-actuated electromagnetic brake so as not to be conducted when the inter-terminal voltage is lower than the predetermined voltage, but to be conducted when the inter-terminal voltage becomes equal to or higher than the predetermined voltage.

A motor brake device includes an armature base, an armature plate, a fixing plate and at least one brake lining. The armature plate is disposed on the armature base. The armature plate is vertically movable relative to the armature base. The fixing plate is fixed on the armature base. The fixing plate and the armature base are located at two opposite sides of the armature plate. The braking assembly is arranged between the armature plate and the fixing plate, and includes a two-winged rotor hub plate, a brake friction plate and at least two elastic elements. The at least one brake lining is arranged between the armature plate and the braking assembly and/or between the fixing plate and the braking assembly.

A brake assembly for an electric motor includes: a magnetic body, a winding, a bolt, a housing part with a brake surface, an armature disk, a brake pad plate, a shaft, a spring part, and a first bushing. The housing part is connected to the magnetic body by the bolt, with a positive fit in at least the circumferential direction. The first bushing is accommodated in a second bushing. The spring part supported on the housing part presses the first bushing and/or the second bushing toward the magnetic body. The radial clearance range covered by the armature disk includes the radial clearance range covered by the second bushing, and the axial region covered by the armature disk includes the axial region covered by the second bushing.