Traction motor for electric vehicles
AssigneeJohnson Electric S.A.
InventorsRui Feng Qin, Chang Jin Zhou, Ling Yang
Life of this patent
Estimating the term…
Abstract
A traction motor for an electric vehicle, comprises a stator and a rotor rotatably mounted to the stator. The rotor comprises a rotor core and magnets fixed to the rotor core. The rotor core has 2P rotor poles formed by the magnets, P being an integer greater than one. The stator comprises a stator core having S teeth and field windings wound on the teeth, S being equal to 3·m·P where m is the number of phases. Field windings of each phase comprises P winding units. Each the winding unit comprises a first coil and a second coil connected in series. The first coils have a larger coil pitch and a greater number of turns compared to the second coils.
Claims19
A traction motor for an electric vehicle, comprising a stator and a rotor rotatably mounted to the stator,
- wherein the rotor comprises a rotor core and magnets fixed to the rotor core, the rotor core having 2P rotor poles formed by the magnets, P being an integer larger than one,
- wherein the stator comprises a stator core having a plurality of teeth and a plurality of field windings wound on the teeth, the field windings forming m phases, m being an integer, the number of the teeth of the stator core being equal to 3·m·P,
- wherein the field windings of each phase comprises P winding units arranged in a circumferential direction of the motor in turns, each of the winding units comprising a first coil wound on a first set of teeth, and a second coil wound on a second set of teeth and connected with the first coil in series, the first set of teeth comprising all the second set of teeth and at least one another tooth, the first coil having a larger coil pitch and a greater number of turns compared with the second coil, and the first coil being wound before the second coil.
A traction motor for an electric vehicle, comprising:
- a stator comprising a stator core having a plurality of teeth and field windings wound on the teeth, the field windings forming m phases, m being an integer, the field windings of each phase comprises P winding units, P being an integer larger than one, each of the winding units comprising a first coil and a second coil connected in series, the first coil having a first circumferential span, the second coil having a second circumferential span located within the first circumferential span, the first coil having a larger coil pitch compared with the second coil, wherein each winding unit having an input end for electricity flowing into the winding unit and an output end for electricity flowing out of the winding unit, the input end is formed as a start of the first coil, and the output end is formed as an end of the second coil, the output end is continuously connected with an input end of another winding unit;
- and
- a rotor rotatably mounted to the stator and comprising a rotor core and a plurality of magnets fixed to the rotor core, the plurality of magnets forming 2P rotor poles,
- wherein the number of the teeth of the stator core is equal to 3·m·P and the number of the winding units of each phase is half of that of the rotor poles.
Dependencies are inferred from the claim text.