Motor control device

Details Motor control device Motor control device

2006-03-28

2006-03-28

Leykin, Rita (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S767000, C318S798000

Reexamination Certificate

active

07019486

ABSTRACT:
A control device of a motor used in, for example, electric power steering control of a vehicle has to monitor the operation thereof to execute such a processing as stopping the control without delay upon detection of error. However, conventional monitoring devices have a disadvantage of taking a long time period the detection or not being able to detect an error of no output. A three-phase inverter circuit52having a substantially constant operation period is employed. The inverter52outputs an output waveform also at the moment of not driving the motor2. An inverter period monitoring circuit555is provided to monitor a period of the output waveform. When the period comes to be too large or too small as compared with a carrier period of the inverter, an alarm is outputted, and control of the inverter is stopped.

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