Rotating electrical machines

Abstract

A dynamo-electric machine (100) comprising a distribution winding motor with each pole / each phase / 2-slot, wherein a stator core (52) has an air gap with a constant width dg1 between the tip ends of between-in-phase teeth (1, 3, 5) and the outer peripheral surface of a rotor core (41), and an air gap with a circumferential-direction non-uniform width and a maximum width value of dg2 (>dg1) between tip ends of between-hetero-phase teeth (2, 4, 6) and the outer peripheral surface of the rotor core (41). A magnetic circuit having magneto-resistance higher than that of the between-in-phase teeth (1) is formed in the between-hetero-phase teeth (2). The difference in air gap width provided so that the number of magnetic fluxes of the between-hetero-phase teeth (2) that has been reduced by an increase in magneto-resistance is almost equal to the number of magnetic fluxes of the between-in-phase teeth (1) allows electromagnetic vibration forces applied to the both in opposite directions to balance and to be offset each other, whereby vibration of the stator core (52) is limited.

Description

technical field [0001] The invention relates to a rotating electrical machine, in particular to a rotating electrical machine capable of reducing electromagnetic noise. Background technique [0002] In recent years, attention has been focused on hybrid vehicles and electric vehicles as vehicles in consideration of environmental issues. A hybrid vehicle includes, in addition to a conventional engine, a DC power supply, an inverter, and a rotary electric machine (electric motor) driven by the inverter as a power source. In addition to obtaining the power source by driving the engine, the DC voltage from the DC power supply is converted into AC voltage through the inverter, and the converted AC voltage is used to rotate the motor to obtain power. [0003] An electric vehicle includes a DC power supply, an inverter, and a motor driven by the inverter as a power source. [0004] In such a hybrid vehicle or an electric vehicle, the electric motor is driven in a relatively wide r...

AI Technical Summary

Problems solved by technology

[0008] However, the AC rotating electric machine for vehicles disclosed in Japanese Laid-Open Publication No. 2003-348781 suffers from the problem that the magnetic field generated in the stator core responds to the supply of alternating current to the wound three-phase stator coil. The pass is not uniform among the multiple stator teeth, so that the 6f electromagnetic excitation cannot be reliably reduced

Radial vibration generated at the stator core due to component imbalance in the radial direction vibrates the air in contact with the outer peripheral surface or inner peripheral surface of the stator core, resulting in the generation of large electromagnetic noise

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