Motor driving system

Details Motor driving system Motor driving system

2007-04-03

2007-04-03

Donovan, Lincoln (Department: 2837)

Electricity: motive power systems

Battery-fed motor systems

C318S599000, C318S254100, C318S434000, C318S434000, C180S443000

Reexamination Certificate

active

10972444

ABSTRACT:
A motor driving system for an electric motor includes a pulse width modulating circuit which provides driving pulse signals whose pulse width is modulated to have a prescribed duty ratio, an inverter having PWM-controlled switch elements, a voltage calculating circuit which calculates levels of voltage to be respectively applied between the power source and the phase windings, a current calculating circuit which calculates reference values of current of the inverter from levels of the voltage applied between the power source and the phase windings of the electric motor and resistances disposed between the power source and the phase windings, a current detecting circuit which detects actual values of current of the inverter, and a processor which judges abnormality if one of the actual value of current of the inverter is a preset value different from corresponding one of the reference values.

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patent: A-2001-8488 (2001-01-01), None
patent: A-2003-164159 (2003-06-01), None

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