Permanent magnet synchronous linear motor
US6831379B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 21, 2002 |
| Grant date | Dec 14, 2004 |
| Priority date | — |
| Expiry date | Oct 21, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K41/031
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A permanent magnet synchronous linear motor comprising a field yoke (1) having a plurality of permanent magnets (2) the polarity of which is alternated and which are arranged linearly and an armature (3) facing the array of the permanent magnets (2) through a magnetic air gap, wherein the armature (3) comprises an armature core (4) having main teeth (4b) and slots (4a), an armature winding (5) wound in the slots 4a of the armature core (4), and auxiliary teeth (6) provided at both the ends of the armature core (4). The distance &tgr;p between the centers of the auxiliary teeth (6) and the pitch &tgr;m of the field poles satisfy a relation &tgr;p=(2n−1)×&tgr;m/2 (n is a positive integer) and the length O of the auxiliary teeth (6) is in a relation of O<Hd<Ht where Hd is the length of the auxiliary teeth (6) in the direction orthogonal to the array of permanent magnets and Ht is the length of the main teeth (4b) in the direction orthogonal to the array of permanent magnets. Thus a high performance permanent magnet synchronous linear motor having reduced cogging thrust can be provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.