Motor control device and electrical equipment with motor controlled thereby
US8536812B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 26, 2011 |
| Grant date | Sep 17, 2013 |
| Priority date | — |
| Expiry date | Apr 14, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P23/04
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A motor control device includes a current detecting unit detecting current flowing into a motor winding, a speed/electrical angle estimating unit estimating a rotational speed and an electrical angle of the motor, based on the current, a load torque estimating unit estimating load torque to be developed by a load, from a torque current obtained based on the current and the electrical angle, a motor constant and inertia moment of the motor inclusive of the load, a load torque phase calculating unit calculating a phase of periodic fluctuation indicated by the load torque, a torque-compensating current determining unit determining a sinusoidal torque-compensating current, based on the load torque phase, and an amplitude/phase adjusting unit detecting speed fluctuation of the motor to adjust amplitude and phase of the torque compensating current by increasing or decreasing the amplitude and the phase so that the speed fluctuation is reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.