Flat linear motor
US5723917A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 30, 1994 |
| Grant date | Mar 3, 1998 |
| Priority date | — |
| Expiry date | Nov 30, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K9/00
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A flat linear motor has a single row of permanent magnets mounted upon backplate and an armature having non-overlapping flat coils encapsulated in a block of epoxy resin mounted upon an armature backplate comprised of a magnetic material and having anchoring recesses or protrusions. The armature backplate serves to provide magnetic circuits of low magnetic resistance in the flat linear motor thereby increasing a force generated by the linear motor. A length of the armature backplate is a non-integral number of a pitch length of the permanent magnets so as to reduce cogging. The three non-overlapping flat coils are comprised of square wire windings which provide increased thermal conduction. An embodiment of the invention employs software commutation wherein a position sensing device is used by a controller to determine a position of the armature from which a field polarity is found by means of a formula or a look-up table. Further embodiments of the invention have a cooling manifold, magnetic flux focusing armature backplates, and a modified Halbach magnet array.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.