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US 8,525,382 B2Granted
Electric motor having primary and auxiliary poles and brush gear
AssigneeJohnson Electric S.A.
InventorsYue Li, Bao Ting Liu, Ji Dong Chai
Life of this patent
Estimating the term…
Abstract
A motor has a stator having a stator core and field windings. The brush gear includes a plurality of brushes, a rotor including a shaft, a rotor core fixed to the shaft, a commutator fixed to the shaft adjacent the rotor core and rotor windings wound about teeth of the rotor core and connected to the commutator. The stator core has a yoke, 2P primary poles about which the field windings are wound, and 2P auxiliary poles. A control device controls the electrical connection of the field windings and the brushes so that 2P or 4P magnetic poles are selectively formed on the stator core when the field windings are electrified. P is an integer equal to or greater than 1.
Claims16
An electric motor comprising:
- a stator having a stator core and 2P field windings;
- wherein the stator core comprises a yoke, 2P primary poles on which the 2P field windings are wound, and 2P auxiliary poles, and wherein the 2P primary poles and 2P auxiliary poles extending inwardly from the yoke, are alternately arranged in the circumferential direction of the yoke;
- a rotor having a shaft, a rotor core fixed to the shaft, a commutator fixed to the shaft, and rotor windings wound about teeth of the rotor and connected to the commutator;
- brush gear having a plurality of brushes arranged to make sliding electrical contact with the commutator;
- a control device for controlling the electrical connecting state of the 2P field windings and the brushes to selectively form on the stator with 2P magnetic poles via the 2P primary poles, respectively, in one state and 4P magnetic poles via the 2P primary poles and 2P auxiliary poles, respectively, in another state when the 2P field windings are electrified, the connecting state of the 2P field windings and the brushes being changeable by the control device to allow the stator to form different magnetic poles in different states when the 2P field windings are electrified, and
- P is an integer equal to or greater than 1.
3 more elements
An electric motor comprising:
- a stator having a stator core and 2P field windings;
- wherein the stator core comprises a yoke, 2P primary poles on which the 2P field windings are wound, and 2P auxiliary poles, and wherein the 2P primary poles and2P auxiliary poles extending inwardly from the yoke, are alternately arranged in the circumferential direction of the yoke,
- a rotor having a shaft, a rotor core fixed to the shaft, a commutator fixed to the shaft, and rotor windings wound about teeth of the rotor and connected to the commutator;
- brush gear having 4P brushes arranged to make sliding electrical contact with the commutator;
- a control device for controlling the electrical connecting state of the 2P field windings and the brushes so that 2P or4P magnetic poles are selectively formed on the stator when the 2P field windings are electrified, and
- P is an integer equal to or greater than 1,
- wherein when only 2P of said 4P brushes are connected with the field windings, 2P magnetic poles are formed at the 2P primary poles when the field windings are electrified wherein the magnetic poles formed at adjacent primary poles have opposite polarity and the number of the magnetic poles is equal to the number of the brushes connected with the field windings.
4 more elements
An electric motor comprising:
- a stator having a stator core and 2P field windings;
- wherein the stator core comprises a yoke, 2P primary poles on which the 2P field windings are wound, and 2P auxiliary poles, and wherein the 2P primary poles and 2P auxiliary poles extending inwardly from the yoke, are alternately arranged in the circumferential direction of the yoke;
- a rotor having a shaft, a rotor core fixed to the shaft, a commutator fixed to the shaft, and rotor windings wound about teeth of the rotor and connected to the commutator;
- brush gear having a plurality of brushes arranged to make sliding electrical contact with the commutator;
- a control device for controlling the electrical connecting state of the 2P field windings and the brushes to selectively form the stator with 2P magnetic poles via the primary poles, respectively, in one state and 4P magnetic poles via the primary poles and auxiliary poles, respectively, in another state when the 2P field windings are electrified, and
- P is an integer equal to or greater than 1.
3 more elements
Dependencies are inferred from the claim text.