Patent ID: 11949317
Assignee: MITSUBISHI ELECTRIC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An electric motor comprising:
a shaft supported rotatably around a rotational axis;
a rotor disposed radially outward of the shaft and configured to rotate integrally with the shaft;
a stator opposing the rotor in a radially spaced apart manner;
a frame containing the rotor and the stator and having a tubular shape with both ends closed, the frame having an inflow hole that allows an outside air to flow in and an outflow hole that allows the outside air having flowed in to flow out;
a first partition member located nearer to the inflow hole than the stator and configured to form, between the first partition member and an inner circumferential surface of the frame, a first ventilation path for a flow of the outside air having flowed in from the inflow hole; and
a second partition member located nearer to the outflow hole than the stator and configured to form, between the second partition member and the inner circumferential surface of the frame, a second ventilation path for a flow of the outside air, wherein
the stator has a third ventilation path penetrating through the stator from one end to another end of the stator in a direction of the rotational axis and configured to communicate with the first ventilation path and the second ventilation path,
the first partition member includes
a first tubular member having an outer circumferential surface opposing the inner circumferential surface of the frame in a spaced apart manner, and
a first attachment member extending in a direction from the outer circumferential surface of the first tubular member to the inner circumferential surface of the frame and fixed to the first tubular member and the frame, and

the first ventilation path is formed between the outer circumferential surface of the first tubular member and the inner circumferential surface of the frame, wherein
the second partition member has a shape of a tube, a diameter of the tube changes from one end to an opposite end.