DC brushless motor controller apparatus and method
US6222333A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 10, 1999 |
| Grant date | Apr 24, 2001 |
| Priority date | — |
| Expiry date | Dec 10, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A low cost, microprocessor (U1) based motor controller (10) for driving a half-wave, multiple speed, reversible, DC brushless motor (30) directly from standard AC 50/60 Hz power. A large number of different speed and rotation direction combinations may be chosen before or after the motor is installed using configuration resistors (R.sub.col1, R.sub.row1). SIDACs (TS2, TS3) each serially connected to a diode (D6, D5) are connected across respective coils (COIL.sub.-- 1, COIL.sub.-- 2) to clamp the flyback energy in the windings to a few volts when triggered and allow Vemf to float when not triggered. The control adjusts the relative phase timing of commutation during start-up and during running to enhance efficiency. Locked rotor protection is provided by limiting start-up time to a selected period which is followed by a selected cool-off time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.