Rotating electrical machine

Abstract

A motor generator includes three types of cooling through-holes. The cooling through-holes are three types of holes passing through the coil end portions in the radial direction and having different flow capacities that allow different amounts of liquid refrigerant to flow. Holes with larger flow capacities allow larger amounts of liquid refrigerant to flow therethrough. In the motor generator, the three types of cooling through-holes are arranged as appropriate according to the temperature increase characteristics of the coil end portions. Consequently, in the motor generator, an appropriate amount of liquid refrigerant can be delivered to each part of the coil end portions according to the difference in temperature increase rate.

Dependencies are inferred from the claim text.