Control system for a permanent magnet motor
US6304052A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 27, 2000 |
| Grant date | Oct 16, 2001 |
| Priority date | — |
| Expiry date | Jun 27, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P21/22
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A control system for an interior permanent magnet motor which includes five regulators to provide efficient control of the motor. Deviation from a desired maximum torque per amp trajectory is minimized by making two of the five regulators field-weakening regulators. First and second regulators provide current control of the quadrature-axis current and direct-axis current, respectively. A limiter limits the direct-axis current from exceeding the maximum allowed stator current and any excess current is added to the quadrature-axis current. Fourth and fifth regulators are field-weakening regulators. The fourth regulator generates a first field-weakening signal that increases the direct-axis signal when the quadrature-axis voltage approaches a desired maximum voltage. The fifth regulator generates a second field-weakening signal that decreases the quadrature-axis current signal when the direct-axis voltage approaches a desired maximum voltage. An inverter circuit applies a modulated current signal to the motor in accordance with the five regulators.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.