Control systems and methods for mitigating motor start-up instabilities in lightly loaded conditions near synchronous speed
US12334850B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 5, 2023 |
| Grant date | Jun 17, 2025 |
| Priority date | — |
| Expiry date | Sep 29, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P23/14
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Inventive concepts herein relate to mitigating phase current oscillations and vibrations in a spinning, lightly loaded three-phase electric motor. A motor starter can transition between various acceleration profiles defined by unique firing angles and/or firing angle rates of change. These transitions adjust the firing angle of thyristors, which directly manage each phase of a three-phase power supply to the motor. The motor start can identify when a motor has residual motion from prior operation and can modulate the firing angle and/or firing angle rate of change accordingly to reduce a duration of time that issues such as phase current oscillations or vibrations might occur.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.