Sensorless universal motor speed controller
US5986417A · kind A · utility
28Cited by
7References
34Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 25, 1996 |
| Grant date | Nov 16, 1999 |
| Priority date | — |
| Expiry date | Apr 25, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P25/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit and method for controlling the speed of a universal motor driven by an AC source is disclosed. The method includes the steps of measuring a value of a temporal property of a current through the motor and determining a speed of rotation of the universal motor using the temporal property. The method for controlling the speed of the universal motor further includes comparing the determined speed of rotation with a desired speed of rotation and adjusting the current through the motor so that the speed of the motor approaches the desired speed of rotation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.