Brushless DC motor
US4507590A · kind A · utility
22Cited by
7References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 15, 1983 |
| Grant date | Mar 26, 1985 |
| Priority date | — |
| Expiry date | Jul 15, 2003 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/16
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A brushless DC motor utilizing only a single position detector and which provides a uniform torque output characteristic with little or no vibration. N phase drive coils are fixedly mounted on a stator yoke. A magnetic rotor assembly, which is rotated by the drive coils, is coupled to rotate a rotary encoder on which m tracks of digitally coded waveform data are recorded. A single m-channel stationary detecting element detects the waveform data produced by rotating the rotary encoder to provide an m-bit parallel signal. The m-bit parallel signal is code converted and applied through power amplifiers to drive the drive coils.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.