Linear motor with reduced cogging force

Details Linear motor with reduced cogging force Linear motor with reduced cogging force

2005-09-27

2005-09-27

Nguyen, Tran (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Linear

Reexamination Certificate

active

06949846

ABSTRACT:
A linear motor in which the shape of magnetic pole surfaces of pole teeth located at both ends of a plurality of pole teeth can be easily formed to be suitable for reducing cogging force. Each of magnetic pole surfaces19aof pole teeth15A located at both ends of a plurality of pole teeth15is constituted by an arc-shaped curved surface that is curved so that a gap from a stator1increases with increasing distance from other adjacent pole tooth15B. Through holes23A and23B that extend in the laminating direction of electromagnetic steel plates10are formed in the vicinity of the magnetic pole surfaces19aof the pole teeth15A. Inside the through holes23A and23B, magnetic pieces, which are shorter than the thickness of the electromagnetic steel plates in their laminating direction, are arranged so as to leave spaces at both ends of the through holes23A and23B.

REFERENCES:
patent: 4638192 (1987-01-01), von der Heide
patent: 5907200 (1999-05-01), Chitayat
patent: 5909066 (1999-06-01), Nanba et al.
patent: 6713899 (2004-03-01), Greubel et al.

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