Drive system for a brushless DC motor
US4344023A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1980 |
| Grant date | Aug 10, 1982 |
| Priority date | — |
| Expiry date | Nov 19, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/28
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A drive system for a brushless dc motor to control the magnitude of the torque of a motor which has permanent magnet rotor and Hall generators. Multipliers determine the magnitude of current to each phase armature winding so as to determine the current sharing rate among the armature windings according to the rotation angle of the rotor, whereby degrading of torque uniformity due to variation of Hall generator characteristics is avoided. Each multiplier multiplies 2 signals, one being the output of the Hall generator, the other being the difference between the torque control input and the fed back signal of total armature current. Also a torque direction input is supplied to each multiplier to determine the direction of the rotational torque.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.