Motor drive device and electric power steering device
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United States of America Patent
Stats
-
Mar 19, 2019
Grant Date -
Dec 7, 2017
app pub date -
Nov 4, 2015
filing date -
Nov 5, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A motor drive device includes a plurality of control systems that individually supply drive currents to a plurality of coil groups included in a motor. The motor drive device independently sets the current command values for the respective control systems. Based on the set current command values, drive instructions are supplied to drive circuits of inverters with respect to the respective control systems, thereby supplying drive currents from the inverters to the coil groups. The motor drive device detects a failure in any of the inverters and the coil groups with respect to each control system, and stops only the failed control system or causes only the failed control system to fall back. The motor drive device further includes a main computing device, and an auxiliary computing device. Consequently, if the auxiliary computing device is normal even in case the main computing device fails, driving of the motor can be continued using one or some of the control systems.
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