Anomaly detector of permanent magnet synchronous electric motor
US8791716B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Aug 27, 2010 |
| Grant date | Jul 29, 2014 |
| Priority date | — |
| Expiry date | Apr 26, 2031 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02T10/64
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
Under a condition that rotor rotation speeds ωes are equal, winding wire currents Id, Iq are equal, and winding wire inductances Ld, Lq are equal in first and second electric motors (1, 2), a magnet temperature anomaly detector (30) provided in a microcomputer (5) calculates a change ratio d(|Φml−Φmr|)/dt of a magnetic flux difference between the first and second electric motors (1, 2) based on the difference Vql*−Vqr* between a q-axis voltage command value Vql* corresponding to the first electric motor (1) and a q-axis voltage command value Vqr corresponding to the second electric motor (2), and then when the change ratio d(|Φml−Φmr|)/dt of the magnetic flux difference is more than a predetermined threshold Sh1, it is determined that a permanent magnet of at least any one of the electric motors (1, 2) has a temperature anomaly.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.