Control device and control method for motor
US8669734B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 15, 2011 |
| Grant date | Mar 11, 2014 |
| Priority date | — |
| Expiry date | Jul 8, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/24485
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A control device divides 360° corresponding to one cycle of a resolver angle into N zones, and determines whether or not a resolver angle θ in the current cycle exceeds a division border. When determined that resolver angle θ in the current cycle exceeds a division border, the control device calculates a time difference ΔT[n] between a calculation time T[n] in the immediately preceding resolver cycle and a calculation time T in the current cycle. The control device also calculates a resolver angle variation Δθ[n] with time difference ΔT[n] by adding 360° to the difference between resolver angle θ obtained in the current cycle and a resolver angle θ[n] obtained in the immediately preceding resolver cycle. The control device then calculates a rotation speed NM by multiplying, by a coefficient K, a value obtained by dividing Δθ[n] by ΔT[n].
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.