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.

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 a motor shaft of the electric motor, the first braking member being configured to selectively translate axially relative to the motor shaft between a first position and a second position. The braking mechanism also includes a second braking member located between the first braking member and the electromagnet and rotationally fixed relative to the first braking member. When the electromagnet is energized, the electromagnet causes the first braking member to translate from the first position to the second position at which the first braking member engages the second braking member to brake the electric motor.

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.

An excitation operation brake includes a braking shaft, an armature that rotates integrally with the braking shaft, and a field core including a disc portion facing the armature. The disc portion includes an outer magnetic shielding portion and an inner magnetic shielding portion, which make a magnetic flux flowing through the disc portion bypass to the armature a plurality of times. The outer magnetic shielding portion includes a bypass magnetic path having a magnetic resistance smaller than the magnetic resistance of a magnetic path that bypasses the armature.

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.

A motorized joint unit of a mechanism comprises a rotor assembly and a stator assembly operatively assembled and configured for being secured to respective links of the mechanism. The rotor assembly and the stator assembly respectively include a rotor and a stator concurrently operable to cause a rotation of a rotor of the rotor assembly relative to a stator of the stator assembly about a rotational axis, a receiving volume delimited by one of the rotor assembly and stator assembly, the rotational axis passing through the receiving volume. A brake assembly is located at least partially in the receiving volume and comprising a brake plunger having a brake surface for brakingly engaging with a corresponding surface of the rotor assembly, the brake plunger displaceable in translation in the brake assembly, and a solenoid coil actuatable to displace the brake plunger against the rotor assembly.

A brake for a motor includes a fixed-side engaging plate fixed to a motor shaft; a movable-side engaging plate coaxially opposed to the fixed-side engaging plate along the direction of a center axis; and a self-holding type solenoid that moves, in the direction of the center axis, the movable-side engaging plate to a halt cancelation position separated from the fixed-side engaging plate and a halt position where engagement with the fixed-side engaging plate occurs. When the motor is halted, the solenoid is driven to move the movable-side engaging plate from the halt cancelation position to the halt position. The movable-side engaging plate which has reached the halt position is mechanically engaged with the fixed-side engaging plate, and the motor shaft is forcibly halted.

A fan braking structure includes a fan including a frame having an upright bearing cup, and a fan impeller having a vertical rotating shaft pivotally received in the bearing cup and provided at a free end with a groove; a braking structure located at a lower part of the bearing cup and including a brake plate and an electromagnet, and the brake plate being provided at one side with a protruded brake pin and at another side with a magnetic member; and an elastic element disposed between and pressed against the brake plate and the electromagnet. When the fan is powered off, the electromagnet is energized and produces magnetic poles that magnetically repel the magnetic member, such that the brake pin is pushed by a magnetic force and the elastic element toward the rotating shaft to engage with the groove, causing the fan to brake and stop rotating inertially.

An electric lawn apparatus is provided including a frame having an upper body and a lower support body, two drive motors, a mow deck supporting multiple deck motors, and a battery. The apparatus further includes a motor control panel having one or more control modules that control the drive motors and the deck motors and a regenerative energy control module; and a regenerative energy absorbing module that is physically decoupled from the motor control panel and is activated by the regenerative energy control module when the voltage from the battery exceeds a voltage threshold.

An electric lawn apparatus is provided including a frame having an upper body and two side plates extending downwardly from sides of the upper body defining a cavity therein, an operator seat mounted on the upper body, two drive motors secured to the side plates away from the cavity, and a battery compartment formed within the cavity. The battery compartment receives battery packs therein along a rear-front axis of the electric lawn apparatus in a side-by-side orientation, where each battery pack has a maximum rated voltage of approximately 40V to 80V. A ratio of the cumulative energy output of the battery packs to a lateral distance between the drive motors is greater than or equal to approximately 0.23 kW/cm.