Linear current source amplifier for brushless DC motor
US5194786A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1991 |
| Grant date | Mar 16, 1993 |
| Priority date | — |
| Expiry date | Feb 27, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/34
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
There is provided a linear current source amplifier for brushless DC motors with linear characteristic and low noise at high currents. A servo current loop for comparing a desired current with the actual winding current is provided to produce a global error signal. A plurality of linear current followers or power stages are configured such that each one of them is capable of providing a current to motor winding proportional to error signal. The power stages are arranged so that a local feedback signal proportional to the current supplied by the power stage is fed back and compared with a signal proportional to the global error signal to drive the current sources. The multiple power stage current sources in one embodiment are configured in a current loop fashion to energize the motor windings.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.