Method of improving efficiency in a multiphase motor, and motor for implementing such a method
US8975856B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 27, 2011 |
| Grant date | Mar 10, 2015 |
| Priority date | — |
| Expiry date | May 25, 2031 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P23/26
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An electric motor (40) has a permanent-magnet rotor (46) and an apparatus for generating a three-phase sinusoidal current (i202, i204, i206) for supplying current to said motor (40), also a microprocessor (95) for executing the following steps: while the motor (40) is running at a substantially constant load, the motor is operated firstly at a predetermined operating voltage (U), and an amplitude of a current flowing to the motor is iteratively sampled, stored, and compared as applied voltage is decreased. If it is found, in this context, that the current flowing to the motor has not decreased as a result of reduction in the voltage amplitude, the motor (40) is operated at that current. If, however, it is found that the current flowing to the motor has decreased as a result of the reduction in the voltage delivered to the motor (40), the measurements and the comparison are repeated, optionally multiple times, in order to identify values for optimized efficiency.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.