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Linear motor

A technology of linear motor and reciprocating linear motion, which is applied in the manufacture of motor generators, electrical components, electromechanical devices, etc., can solve the problems of curved surface deformation, increased eddy current loss, difficulty in reducing cogging stress arc shape, etc., to prevent Effects of deformation, reduction of eddy current loss, reduction of mass deviation

Inactive Publication Date: 2005-03-09
SANYO DENKI CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, this linear motor has a problem that it is difficult to form an arc shape optimal for reducing cogging stress because the metal plate is processed to form an arc-shaped curved surface.
In addition, there is a problem of increased eddy current loss due to the use of metal processing plates
In addition, there is a problem that the curved surface is easily deformed by external force
Therefore, it is easy to cause the problem of unstable quality

Method used

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Embodiment Construction

[0022] Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. figure 1 It is a schematic diagram for explaining the structure of the linear motor which implements one Example of this invention. figure 1 A part of the stator 1 and a part of the mover 3 are represented in . Such as figure 1 As shown, the linear motor of this embodiment has a stator 1 and a mover 3 . The stator 1 has a structure in which a magnetic pole row 7 is provided on a base plate 5 . The magnetic pole row 7 is formed by alternately arranging a plurality of N-pole permanent magnets 7A and a plurality of S-pole permanent magnets 7B.

[0023] The mover 3 is movably supported on the stator 1 by a support mechanism not shown. Such as figure 2 As shown in the perspective view of , the mover 3 includes an armature composed of a magnetic core 9 and multi-phase field coils 11 . . . The magnetic core 9 is formed by laminating a plurality of ...

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Abstract

There is provided 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 surfaces 19a of pole teeth 15A located at both ends of a plurality of pole teeth 15 is constituted by an arc-shaped curved surface so curved that a gap from a stator 1 increases with increasing distance from other adjacent pole tooth 15B. Through holes 23A and 23B that extend in the laminating direction of electromagnetic steel plates 10 are formed in the vicinity of the magnetic pole surfaces 19a of the pole teeth 15A. Inside the through holes 23A and 23B, magnetic pieces shorter than the thickness of the electromagnetic steel plates in their laminating direction are so arranged as to leave spaces at both ends of the through holes 23A and 23B.

Description

technical field [0001] The present invention relates to linear motors. Background technique [0002] Some linear motors in which a mover reciprocates linearly with respect to a stator include one or more magnetic pole rows in which a plurality of permanent magnets are arranged in a row, and an armature. This armature has a magnetic core in which a plurality of steel sheets are laminated, and a plurality of field coils. The magnetic core has a plurality of pole teeth. The plurality of pole teeth have a yoke extending linearly in a direction perpendicular to the lamination direction of the steel sheets at the end, and a magnetic pole surface protruding from the yoke toward the magnetic pole row side and facing the magnetic pole row. . A plurality of excitation coils excites a plurality of pole teeth. However, this type of linear motor has a problem of increasing cogging stress. In contrast, as shown in FIG. 7 of US Pat. No. 4,638,192, a linear motor in which a metal proces...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K41/03H02K41/02
CPCH02K41/031H02K15/03H02K33/18
Inventor 杉田聪三泽康司
Owner SANYO DENKI CO LTD
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