Rotating electric machine

Abstract

The present invention provides a rotary electric machine capable of expanding a wetted area to a coil end portion, uniformly cooling the coil end portion, and suppressing an increase in friction. Therotating electric machine includes a stator (3) having a cylindrical stator core (31) and a coil (12) assembled on the stator core (31); and a rotor (4), which is configured to be able to rotate in adiameter relative to the stator (3). Rotating inward; and a refrigerant flow path (6), which is provided in the rotor (4) and allows the refrigerant to circulate as the rotor (4) rotates. The refrigerant flow path (6) has a rotor internal flow path (61) formed inside the rotor (4) and a direction communicating with the rotor internal flow path (61) and extending in a direction facing the central axis (C) of the rotor (4). The nozzle section (62) opened on the end face of the nozzle has a cross-sectional area smaller than that of the internal flow path (61) of the rotor in a cross section perpendicular to the flow direction of the refrigerant.

Description

technical field [0001] This invention relates to rotating electric machines. Background technique [0002] Conventionally, a rotating electric machine has been used as a power source of a hybrid vehicle or an electric vehicle. In a rotating electrical machine, a magnetic field is formed in a stator core by supplying a current to a coil, and magnetic attraction and repulsion are generated between the permanent magnets of the rotor and the stator core. Thus, the rotor rotates relative to the stator. [0003] In addition, especially during high-load operation, when current flows through the coils of the stator, the coils generate heat due to copper loss. The heat generated by the coil is a factor that degrades the performance of the rotating electric machine. Therefore, various techniques for cooling the coils of the stator have been proposed. [0004] For example, in Patent Document 1 (Japanese Unexamined Patent Publication No. 9-182374), it is described that an axial oil ...

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Problems solved by technology

[0007] However, in the technique described in the above-mentioned Patent Document 1, if the flow velocity of the oil released from the oil hole cannot be ensured, there is a possibility that the root portion of the coil end portion located near the stator core may be partially pumped from the inner side in the radial direction. ground supply of refrigerant

In this case, uneven cooling of the coil may occur

Therefore, in the prior art, there is a problem in providing a rotating electric machine that expands the wetting area to the coil end portion and cools the coil end portion uniformly.

[0008] In addition, in conventional rotating electric machines, when the amount of oil supplied to the root of the coil end is too large, the oil tends to enter the air gap formed between the rotor and the stator core, which becomes a factor that increases friction.

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