Control circuit for a brushless DC motor
US4455514A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 20, 1982 |
| Grant date | Jun 19, 1984 |
| Priority date | — |
| Expiry date | Apr 20, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Disclosed is a control circuit for a brushless DC motor including a rotor having a series of alternating magnetic fields and a stator having a plurality of armature windings. The control circuit comprises at least one pair of Hall generators fixedly mounted with respect to the rotor for sensing the angular position of the rotor to generate a switching signal. An input torque command signal is applied sequentially to the armature windings in response to the switching signal to rotate the rotor. The strength of magnetic field linked with the windings and the magnitude of current generated therein are detected and multiplied to generate a torque representing signal which is subtractively combined with the input torque command signal prior to application to the windings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.