Invention Grant
- Patent Title: Linear motor and linear motor cogging reduction method
- Patent Title (中): 线性电机和线性电机齿槽减速法
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Application No.: US12675577Application Date: 2008-09-11
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Publication No.: US08030804B2Publication Date: 2011-10-04
- Inventor: Toshiyuki Aso , Hiroshi Kaneshige , Akie Tanaami
- Applicant: Toshiyuki Aso , Hiroshi Kaneshige , Akie Tanaami
- Applicant Address: JP Tokyo
- Assignee: THK Co., Ltd.
- Current Assignee: THK Co., Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Westerman, Hattori, Daniels & Adrian, LLP
- Priority: JP2007-240143 20070914
- International Application: PCT/JP2008/066453 WO 20080911
- International Announcement: WO2009/035050 WO 20090319
- Main IPC: H02K41/03
- IPC: H02K41/03

Abstract:
Provided is a linear motor capable of reducing cogging. The linear motor has a field magnet part 5 having a plurality of permanent magnets 21 arranged to form N and S poles alternately; a core 14 having a plurality of salient poles 14a, 14b and 14c arranged facing the field magnet part 5; and a three-phase coil 16 wound around the salient poles 14a, 14b and 14c of the core 14. At respective sides in the moving direction of an armature having the three-phase coil 16 and the core 14, auxiliary cores 18 made of a magnetic material are provided to sandwich the armature 10. The distance P1 between a center of each auxiliary core and a center of a center salient pole 14b is set to be substantially ¼×(2N+1)×a magnetic pole pitch between N poles of the field magnet part 5 (N: an integer equal to or greater than 1).
Public/Granted literature
- US20100207464A1 LINEAR MOTOR AND LINEAR MOTOR COGGING REDUCTION METHOD Public/Granted day:2010-08-19
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