A motor, a rotor and a sleeve are provided. The motor includes a stator and a rotor which includes a shaft, a rotor core, a sleeve, a commutator, and a rotor winding wound on the rotor core. The sleeve is arranged between the rotor core and the commutator. The sleeve includes a first end portion close to the commutator, a second end portion close to the rotor core, and a middle portion therebetween. An outer diameter of the first end portion is smaller than an outer diameter of the middle portion, and the outer diameter of the middle portion is smaller than an outer diameter of the second end portion. An end of the commutator close to the sleeve has a groove, and the first end portion of the sleeve is placed in the groove. The rotor has a good seismic performance.

A motor, a rotor and a sleeve are provided. The motor includes a stator and a rotor which includes a shaft, a rotor core, a sleeve, a commutator, and a rotor winding wound on the rotor core. The sleeve is arranged between the rotor core and the commutator. The sleeve includes a first end portion close to the commutator, a second end portion close to the rotor core, and a middle portion therebetween. An outer diameter of the first end portion is smaller than an outer diameter of the middle portion, and the outer diameter of the middle portion is smaller than an outer diameter of the second end portion. An end of the commutator close to the sleeve has a groove, and the first end portion of the sleeve is placed in the groove. The rotor has a good seismic performance.

This disclosure describes a DC motor system that is capable of extracting electrical power to do useful work while the DC motor is in operation. The present invention relates to a DC motor configured to have a plurality of brushes which enables two of the plurality of brushes to serve as input power brushes and at least one of the plurality of brushes to serve as power extraction brush to extract electrical power from the DC motor. The extraction of electrical power is achieved by using a power extraction circuit which switches the extracted power between two different energy storage devices. The energy storage device includes and not limited to capacitors and batteries.

When teeth (12) are allocated in a circumferential direction in sequence of a U phase, a V phase and a W phase, a forward wound coil wound on each of the phases is provided as a coil of the U phase, the V phase and the W phase, and a reverse wound coil wound on each of the phases is provided as the coil of a U phase, a V phase and a W phase, the coils are electrically connected between the neighboring segments in an order of the U phase, the W phase, the W phase, the V phase, the U phase, the U phase, the W phase, the V phase and the V phase, and the wire (14) drawn between the armature core (8) and the commutator (10) is drawn around the rotation shaft in the same direction.

When teeth (12) are allocated in a circumferential direction in sequence of a U phase, a V phase and a W phase, a forward wound coil wound on each of the phases is provided as a coil of the U phase, the V phase and the W phase, and a reverse wound coil wound on each of the phases is provided as the coil of a U phase, a V phase and a W phase, the coils are electrically connected between the neighboring segments in an order of the U phase, the W phase, the W phase, the V phase, the U phase, the U phase, the W phase, the V phase and the V phase, and the wire (14) drawn between the armature core (8) and the commutator (10) is drawn around the rotation shaft in the same direction.

According to the present invention, a coil is continuously wound in a single pass around each of a series of teeth, and connected to each segment.

An electric motor includes a stator operable to produce a magnetic field and defining an opening, and a rotor at least partially disposed within the opening. The rotor includes a shaft extending along a rotational axis, a first rotor magnetic core portion including a plurality of laminations stacked contiguously on the shaft, and a second rotor magnetic core portion coupled to the plurality of laminations. The first rotor magnetic core portion and the second rotor magnetic core portion cooperate to define the rotor magnetic core. A plurality of windings is coupled to the rotor magnetic core and an air flow path is formed as part of the second rotor magnetic core portion. The air flow path includes an axial portion that passes through the shaft axially along the rotational axis and a radial portion that extends radially outward through the second rotor magnetic core portion.

An electric motor includes a stator operable to produce a magnetic field and defining an opening, and a rotor at least partially disposed within the opening. The rotor includes a shaft extending along a rotational axis, a first rotor magnetic core portion including a plurality of laminations stacked contiguously on the shaft, and a second rotor magnetic core portion coupled to the plurality of laminations. The first rotor magnetic core portion and the second rotor magnetic core portion cooperate to define the rotor magnetic core. A plurality of windings is coupled to the rotor magnetic core and an air flow path is formed as part of the second rotor magnetic core portion. The air flow path includes an axial portion that passes through the shaft axially along the rotational axis and a radial portion that extends radially outward through the second rotor magnetic core portion.

A rotor includes coils that are formed by winding wires around bobbins of a core, terminals which are arranged on the bobbins and to which end portions of the wires are hooked, and a commutator arranged at an end portion of the core on a side where the terminals are arranged. The terminals and commutator segments of the commutator are electrically connected via metal pieces extending from the commutator segments and via a wiring board.

A rotor includes coils that are formed by winding wires around bobbins of a core, terminals which are arranged on the bobbins and to which end portions of the wires are hooked, and a commutator arranged at an end portion of the core on a side where the terminals are arranged. The terminals and commutator segments of the commutator are electrically connected via metal pieces extending from the commutator segments and via a wiring board.