Rotating electric machine, electric wheel, and vehicle
AssigneeHitachi, Ltd.
InventorsAkeshi Takahashi, Tetsuya Suto, Makoto Ito
Life of this patent
Estimating the term…
Abstract
The rotating electric machine includes a stator having a stator core around which a plurality of coils are wound; a rotor supported to be rotatable relative to the stator with a predetermined gap therebetween; a rotor case that holds the rotor; and a first bearing and a second bearing that rotatably support the rotor case. The rotating electric machine includes: a first flow path formation body that forms a first flow path through which a refrigerant flows to a coil end part protruding from the stator core; a first case part which forms an accommodation space of the first bearing, is connected to the first flow path of the first flow path formation body, and fills the accommodation space with the refrigerant.
Claims18
A rotating electric machine which includes a stator having a plurality of coils and a stator core around which the plurality of coils are wound, a rotor rotatably supported relative to the stator with a predetermined gap therebetween, a rotor case that holds the rotor, and a first bearing and a second bearing that rotatably support the rotor case, the rotating electric machine comprising:
- a first flow path formation body that forms a first flow path through which a refrigerant flows to a coil end part protruding from the stator core;
- a first case part that forms an accommodation space of the first bearing, that is connected to the first flow path of the first flow path formation body, and that fills the accommodation space with the refrigerant;
- a second flow path formation body that forms a second flow path through which the refrigerant flows to a coil end part arranged on a side opposite to the coil end part in an axial direction;
- and
- a second case part that forms an accommodation space of the second bearing, that is connected to the second flow path of the second flow path formation body, and that fills the accommodation space with the refrigerant,
- wherein, when viewed from a radial direction of the rotor, either or both of the first bearing and the second bearing are arranged on an outer diameter side of the coil end part and in a position overlapping the coil end part.
A vehicle comprising a rotating electric machine, wherein the rotating electric machine includes a stator having a plurality of coils and a stator core around which the plurality of coils are wound, a rotor rotatably supported relative to the stator with a predetermined gap therebetween, a rotor case that holds the rotor, and a first bearing and a second bearing that rotatably support the rotor case, the rotating electric machine comprising:
- a first flow path formation body that forms a first flow path through which a refrigerant flows to a coil end part protruding from the stator core;
- a first case part that forms an accommodation space of the first bearing, that is connected to the first flow path of the first flow path formation body, and that fills the accommodation space with the refrigerant;
- a second flow path formation body that forms a second flow path through which the refrigerant flows to a coil end part arranged on a side opposite to the coil end part in an axial direction;
- and
- a second case part that forms an accommodation space of the second bearing, that is connected to the second flow path of the second flow path formation body, and that fills the accommodation space with the refrigerant,
- the vehicle further comprising:
- a battery;
- a power converter that converts DC power of the battery into AC power and supplies the AC power to the rotating electric machine, wherein the torque of the rotating electric machine is transmitted to vehicle wheels;
- and
- a controller that controls the power converter, wherein, by controlling the power converter to supply power from the battery to the coil in a state where the rotor is stopped, the controller performs warm-up operation control to increase temperatures of the first bearing and the second bearing by heat generation of the coil.
Dependencies are inferred from the claim text.