Motor driving device and method for measuring phase current in motor driving device
US10840842B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2016 |
| Grant date | Nov 17, 2020 |
| Priority date | — |
| Expiry date | Aug 24, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a motor driving device and a method for measuring a phase current in a motor driving device, and specifically relates to a technique of measuring three phase currents of a three-phase brushless motor using a current sensor for measuring the DC bus current in the inverter. The control unit according to the present invention shifts a pulse phase of a PWM pulse such that pulse phases of the three phase PWM pulses in a first PWM cycle of the PWM control differ from those in a second PWM cycle of the PWM control, and measures the three phase currents from the output of the current sensor in these two first and second PWM cycles. The control unit calculates an offset error of the current sensor from these three phase current measurements and learns a correction value used for performing offset correction on the electric-current measurement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.