System and method for transient-based motor speed estimation with transient excitation
US7227326B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 24, 2006 |
| Grant date | Jun 5, 2007 |
| Priority date | — |
| Expiry date | Apr 24, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P23/20
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
AC motor control systems and speed controllers are presented, including a transient-based speed estimation system that provides a rotor speed estimate based on a measured speed-related motor transient signal, and a transient excitation system which selectively modifies at least one switch control signal to excite the measured motor transient. The measured speed-related transient may include a phase error signal, a phase lag signal, a peak current signal, a voltage integral signal, a motor winding voltage signal, a switching device voltage, and a voltage zero crossing signal, and the switching signal modification can comprise removal of select pulse(s) from a switching control pulse stream or selective modification of spacings between pulses to re-excite the motor transient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.