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US 8,796,900 B2Granted
Electric motor
AssigneeJohnson Electric S.A.
InventorsJi Dong Chai, Yan Nian Liu, Liang Guan, Bao Ting Liu
Life of this patent
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Abstract
An electric motor has a stator, a rotor and brush gear. The rotor includes a shaft, a rotor core fixed to the shaft, a commutator fixed to the shaft, and rotor windings wound on the rotor core and electrically connected to the commutator. The brush gear includes at least two arcuate brushes for making sliding contact with the commutator. The commutator and brush gear are disposed within a space formed in the rotor core to minimize the axial length of the motor.
Claims18
An electric motor comprising:
- a stator having a number of permanent magnet stator poles;
- brush gear with at least two brushes;
- and
- a rotor comprising a shaft, a rotor bracket fixed to the shaft, a ring shaped rotor core fixed to the rotor bracket, a commutator fixed to the shaft and arranged inside the rotor core, and rotor windings wound on the rotor core and electrically connected to the commutator, the commutator comprising an electrically insulating body, a plurality of segments spaced on the body, and a plurality of terminals respectively electrically connected to the segments, each terminal having a connecting portion for engaging a lead wire of the rotor windings,
- wherein a radially outer surface of the rotor bracket is press-fitted to a radially inner surface of the rotor core.
2 more elements
Dependencies are inferred from the claim text.