Polyphase ac electric motor

Abstract

[Problem] To provide a polyphase AC electric motor with which it is possible to suppress partial discharge. [Solution] The present invention is characterized in that: the winding for each phase has afirst partial conductor that is an input-side partial conductor, an n-th partial conductor connected to a neutral point, and second through (n-1)th partial conductors; and a partial conductor that isdisposed adjacent in the stator to the first partial conductor for each phase, or a partial conductor having a coil end part disposed adjacent to a coil end part where the first partial conductor extends from a slot to the outside, is (1) an a-th partial conductor (where a is a natural number equal to 2 or greater) of the same phase or a different phase in which the voltage assumes an extreme value when the alternating-current voltage from an inverter is applied, (2) any of (a-3)th through (a-1)th partial conductors of the same phase or different phases, or any of (a+1)th through (a+3)th partial conductors of the same phase or different phases, connected to an intermediate partial conductor for which the extreme value is adopted, or (3) any of (n-3)th through n-th partial conductors of thesame phase or different phases.

Description

technical field [0001] This invention relates to polyphase AC motors. Background technique [0002] For example, in an electric motor used in automobiles, windings are accommodated in slots provided in an annular stator core (stator), and this motor has a shape in which a part of the windings protrudes from the stator toward the axially outer coil end. . [0003] In recent years, in response to the need to mount an electric motor without changing the volume of the engine room of the vehicle, the electric motor including coil ends has been required to be smaller in size and higher in output. In order to meet such a demand, if the length of the coil end is shortened and the distance between adjacent conductors is reduced as much as possible, there is a problem that a very high voltage difference occurs between the conductors and insulation performance due to partial discharge occurs. deteriorating. [0004] Regarding the deterioration of insulation performance caused by par...

AI Technical Summary

Problems solved by technology

In order to meet such a demand, if the length of the coil end is shortened and the distance between adjacent conductors is reduced as much as possible, there is a problem that a very high voltage difference occurs between the conductors and insulation performance due to partial discharge occurs. deterioration

However, according to such a method, there is a possibility that the manufacturing cost of the stator increases

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