Linear motor and linear motor cogging reduction method

Details Linear motor and linear motor cogging reduction method Linear motor and linear motor cogging reduction method

2008-09-11

2011-10-04

Mullins, Burton (Department: 2834)

Electrical generator or motor structure

Dynamoelectric

Linear

Reexamination Certificate

active

08030804

ABSTRACT:
Provided is a linear motor capable of reducing cogging. The linear motor has a field magnet part5having a plurality of permanent magnets21arranged to form N and S poles alternately; a core14having a plurality of salient poles14a,14band14carranged facing the field magnet part5; and a three-phase coil16wound around the salient poles14a,14band14cof the core14. At respective sides in the moving direction of an armature having the three-phase coil16and the core14, auxiliary cores18made of a magnetic material are provided to sandwich the armature10. The distance P1between a center of each auxiliary core and a center of a center salient pole14bis set to be substantially ¼×(2N+1)×a magnetic pole pitch between N poles of the field magnet part5(N: an integer equal to or greater than 1).

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International Search Report of PCT/JP2008/066453, mailing date of Dec. 9, 2008.
International Preliminary Report on Patentability (Form PCT/IB/373) of International Application No. PCT/JP2008/066453 dated Apr. 7, 2010 with form PCT/ISA/237.

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