Electric motor drive control device, electrically driven power steering device, electrically driven brake device, and electrically driven pump device
US9831814B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 21, 2015 |
| Grant date | Nov 28, 2017 |
| Priority date | — |
| Expiry date | Jun 6, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P6/187
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
An electric motor drive control device includes: an inverter circuit that converts DC power inputted via a DC bus to multiphase AC power and outputs the multiphase AC power to an electric motor; a current detector that detects a DC current flowing in the DC bus; a PWM generator that generates PWM signals and outputs the PWM signals to the inverter circuit; a current calculator that calculates a current value for each of phases to be flowed to the electric motor based upon a value of the DC current and the PWM signals; and a current controller that generates a command signal based upon the current value, and outputs the command signal to the PWM generator, wherein: if one of the phases of the AC power has become missing, the current calculator determines which phase is one that has become missing and calculates current values for other phases.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.