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US 2012/0256507 A1Published application
Electric motor
AssigneeJohnson Electric S.A.
InventorsYue Li, Li Sheng Liu
Life of this patent
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Abstract
A brush direct current motor has a stator with a plurality of coils that correspond to N phases, a rotor with 2P magnet poles and a current converting device for converting direct current power to N phases current and carrying the N phases of alternating current for the coils of the stator. The current converting device has a plurality of first and second bars alternately arranged with transiting plates along a brush path. Resistors connect the transiting plates to one of the adjacent bars.
Claims16
A brush direct motor, comprising:
- a stator comprising a plurality of coils that correspond to N phases;
- a rotor comprising a shaft and 2P radially polarized permanent magnetic poles;
- a commutator fixed to the shaft, comprising:
- a first conductive ring;
- a second conductive ring spaced from the first conductive ring;
- a plurality of first bars extending from the first conductive ring;
- a plurality of second bars extending from the second conductive ring;
- a plurality of transiting plates;
- a body supporting the first conductive ring, second conductive ring first bars, second bars and the transiting plates;
- and a plurality of resistors, wherein the first and second bars are alternately arranged along a brush path, at least one of the transiting plates is disposed between each of the first bars and the second bars, and one of the resistors is respectively connected between each of the transiting plates and one of the adjacent first and second bars;
- two first brushes respectively arranged to make sliding electrical connected to the first and second conductive rings;
- and
- a plurality of second brushes arranged to make sliding electrical contact with the first bars, second bars and transiting plates and electrically connected to the N phases.
10 more elements
A commutator, comprising:
- a first conductive ring;
- a second conductive ring spaced from the first conductive ring;
- a plurality of first bars extending from the first conductive ring;
- a plurality of second bars extending from the second conductive ring;
- a plurality of transiting plates;
- a body adapted to be fixed to a shaft and supporting the first conductive ring, second conductive ring first bars, second bars and the transiting plates;
- and
- a plurality of resistors, wherein the first and second bars are alternately arranged along a brush path, at least one of the transiting plates is disposed between each of the first bars and the second bars, and one of the resistors is respectively connected between each of the transiting plates and one of the adjacent first and second bars.
5 more elements
A brush direct current motor, comprising:
- a stator comprising a plurality of coils that correspond to N phases;
- a rotor received in the stator and comprising 2P radially polarized magnet poles;
- a current converting device for commutating the direct current supplied from a direct current power source to N phases of alternating current and connecting the N phases currents to respective coils of the stator, the current converting device comprising a plurality of bars connected to a positive or negative power source;
- a plurality of first transiting plates respectively arranged between two adjacent bars, and
- a plurality of resistors respectively connected to the first transiting plates and one of the adjacent bars.
2 more elements
Dependencies are inferred from the claim text.