Linear motor
US6476524B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 21, 2000 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Sep 21, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K11/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A moving-coil linear motor free of cogging. The motor has a rotor (3) including separated block cores (31, 32 and 33), each of which has a length equivalent to eight times the magnet pitch (Pm) and includes nine teeth (4) along the length. The block cores are arranged in line and separated by gaps equivalent to ⅔ of the magnet pitch. The first block (31) is divided into three groups of teeth (4) with armature coils (5) to form U-, V- and W-phases. Similarly, the second block (32) is grouped to form V-, W- and U-phases, and the third block (33) is grouped to form W-, U- and V-phases. The armature coils (5) are formed to differ in phase by 120 degrees from one another in order to zero the sum of the cogging caused by the blocks.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.