A fuse component configured to provide overcurrent protection for an electric motor comprises a spiral fuse portion and a magnetic core. The spiral fuse portion encloses at least a part of the magnetic core, so that the fuse component is also configured to function as a choke of the electric motor.

The invention relates to a current sensor device for monitoring the current flowing through a brush, comprising: —a brush holder (12) extending in a longitudinal direction and defining a through-housing intended to accommodate a brush such that one end of tie brush which is intended to brush against a rotating movable surface protrudes from the brush holder, a Hall effect sensor (14) arranged to detect a magnetic field: —a concentrator (16) for concentrating the magnetic fields in a concentrated magnetic field zone and for protecting the zone from external magnetic fields, in which: —the concentrator (16) is mounted on the brush holder (12) so as to surround at least part of the housing of the brush holder: —the Hall effect sensor is mounted on the brush holder (12) at a position located inside the concenrated magnetic field zone.

A fuse component (36) configured to provide overcurrent protection for an electric motor (20) comprises a spiral (41) of a plurality of coaxial wire loops (44) and an outer insulating sleeve (39) surrounding at least a portion of the spiral (41). The overcurrent threshold of the fuse component (36) may be adjusted by changing the number of loops in the spiral (41) or the cross-section area of the wire in the spiral (41). The fuse component (41) may also function as an inductor (35) and/or connected to a speed adjustable resistor.

A motor includes a rotor, a back cover, a housing, and a brush card assembly. The rotor includes a core fixed to a shaft, a coil that magnetizes a core, and a commutator connected to the coil. The back cover includes a back cover bottom surface portion, and a back cover cylindrical portion on an outer periphery of the back cover bottom surface portion to have a cylindrical shape. The brush card assembly includes a brush card bottom surface portion spaced apart from the back cover bottom surface portion in an axial direction through a first gap. The brush card bottom surface holds brushes and includes a nip portion nipped by the back cover and the housing, an outer peripheral wall spaced apart from the back cover cylindrical portion in a radial direction through a second gap, and contact portions contacting the back cover cylindrical portion.

A brush holder apparatus includes a stationary support member having at least one groove and a fork electrical connector. A brush retainment member is configured to be releasably affixed to the stationary support member. The brush retainment member has at least one rail configured to slide along the at least one groove. The brush retainment member has a knife electrical connector configured to mate with the fork electrical connector. The stationary support member is configured for electrical connection to a collector mount and the brush retainment member is configured to retain at least one brush.

A brush holder system includes a stationary support member having at least one groove, and a fork electrical connector. A brush retainment member is configured to be releasably affixed to the stationary support member. The brush retainment member has at least one rail configured to slide along the at least one groove. The brush retainment member has a knife electrical connector configured to mate with the fork electrical connector. A radio frequency identification device (RFID) tag is mounted on the brush retainment member, and the RFID tag is configured to monitor brush wear and communicate brush wear status to a monitoring system. The stationary support member is configured for electrical connection to a collector mount and the brush retainment member is configured to retain at least one brush.

A brush assembly includes a brush holder, a brush, an elastic element, and a conductive terminal. The brush slidably is accommodated in the brush holder. The elastic element is resisted between the brush and the brush holder. And the conductive terminal is formed by bending from the brush holder.

A brush assembly includes a circuit board, at least two brushes, power connecting terminals for connecting with an external power supply, and a power supply branch circuit connected in series between a corresponding one of the power connecting terminals and a corresponding one of the brushes. The brush assembly further comprises an EMI suppressor connected between the power supply branch circuit and ground. The EMI suppressor is an axial capacitor formed by a conductor core, a cover, and a filling medium. The cover is attached around the conductor core, and the filling medium is filled between the conductor core and the cover. A motor utilizing the brush assembly is also provided.

A motor includes a motor body including a bottom part and a motor terminal 26 provided at the bottom part, and a terminal unit 200 mounted at the bottom part of the motor body. The terminal unit 200 includes a holder 210, a PTC thermistor 180 and a terminal part 330b fixed to the holder 210, and a wiring part electrically connecting the motor terminal 26 and the terminal part 330b. The PTC thermistor 180 is provided at the wiring part. In the radial direction, the terminal part 330b and the PTC thermistor 180 are arranged and facing each other.

A motor includes a frame in the shape of a bottomed cylinder, a stator housed in the frame, a rotor, an end plate for closing an opening of the frame, and bearings rotatably supporting a rotary shaft of the rotor. The frame has, on its bottom, a bearing holder at the center and ribs extending like rays from the bearing holder radially outward and protruding to the inside of the frame. Each rib has a radially outer end reaching a circumferential wall of the frame.