Electric motor with poles shaped to minimize cogging torque

Details Electric motor with poles shaped to minimize cogging torque Electric motor with poles shaped to minimize cogging torque

2007-06-12

2007-06-12

Schuberg, Darren (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Rotary

C310S156560

Reexamination Certificate

active

10981170

ABSTRACT:
An electric motor has a rotor (36) and a stator (28) having a lamination stack formed with slots (126). The slots have a predetermined slot pitch (τs), and a multi-phase stator winding is arranged in them. The rotor (36) has salient poles having pole shoes (136) and a magnetic return path (130). Between the return path (130) and each pole shoe (136), a recess (138, 140) is formed for receiving a permanent magnet (38). On each side of such a permanent magnet (38), a region (146a, 146b) of poor magnetic conductivity is arranged, in order to make the flux distribution in the air gap more sinusoidal. Measuring in a circumferential direction, the width (β) of a pole shoe (136) decreases with increasing distance from an interface (138) between said return path and said permanent magnet (38), and, at a place of lowest width, the pole shoe has an angular extent (βc) which has, with respect to the slot pitch (τs) between said stator slots (126), the following relationship:in-line-formulae description="In-line Formulae" end="lead"?βc=n*τs*(1−0.02) . . .n*τs*(1−0.2),in-line-formulae description="In-line Formulae" end="tail"?where n=1, 2, 3 . . . andβc and τs are measured in mechanical degrees.

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