Motor speed control apparatus for keeping the speed of the motor fixed in the presence of a disturbance torque
US5467004A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1993 |
| Grant date | Nov 14, 1995 |
| Priority date | — |
| Expiry date | Nov 17, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P23/186
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor control apparatus controls a motor speed according to a detected period of a frequency signal whose frequency is in proportion to the motor speed and drives the motor so as to keep its speed fixed according to a drive signal. The motor control apparatus includes a disturbance torque observer receptive to the drive signal and the detected period which produces a estimated disturbance signal corresponding to a conversion of a disturbance torque into an electrical signal. A comparator produces a period error signal which is a difference between the detected period and a desired period. An arithmetic unit produces the control signal in accordance with the period error signM. A torque correcting unit produces the drive signal by adding the estimated disturbance signal to the control signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.