Linear actuator
US9653964B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 2013 |
| Grant date | May 16, 2017 |
| Priority date | — |
| Expiry date | Jan 27, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02K23/38
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
[Problem] To reduce the size of a linear actuator motor without increasing the operating noise thereof, and to thereby achieve a quieter, more compact linear actuator. [Solution] A linear actuator including: a shaft that is rotated in the forward and reverse directions by a motor via a double start worm and a worm wheel; a screw nut that is screwed and mounted to the shaft; and a piston tube that is fixed to the screw nut and that advances or retreats in accordance with the rotation of the shaft. The motor includes: a four-pole magnet; an armature formed by lap winding an armature coil; a commutator; brushes that are vertically arranged at positions offset by approximately 90°; and an equalizer for connecting coils in the armature coil that are to undergo potential equalization.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.