Method and system for detecting the disconnection of an...

Details Method and system for detecting the disconnection of an... Method and system for detecting the disconnection of an...

2006-08-29

2006-08-29

Masih, Karen (Department: 2837)

Electricity: motive power systems

Induction motor systems

C318S782000, C318S798000, C318S802000, C318S805000, C318S812000

Reexamination Certificate

active

07098624

ABSTRACT:
To a neutral point of a motor is connected a positive electrode of an auxiliary battery and an auxiliary load. Voltage on a power supply line to the auxiliary load, a neutral point voltage, is detected, and disconnection of the auxiliary battery is determined when an increase of ripples in the neutral point voltage is detected. When a voltmeter cannot be used, control of the neutral point voltage is continued by measuring current of the auxiliary battery and performing control such that the current value becomes 0. A resolver is further provided on the motor for detecting the rotor angle with high accuracy. A control circuit generates, in accordance with an output of the resolver, a voltage control signal for each phase current having the same amplitude as the carrier amplitude during startup, and compares the voltage control signal to carrier to obtain a gate signal having the same frequency as the carrier frequency. In switching of the inverter, due to this gate signal, periods in which all phases are on or off are reduced, thereby preventing a large neutral point current.

REFERENCES:
patent: 6476571 (2002-11-01), Sasaki
patent: 2002/0105300 (2002-08-01), Moriya et al.
patent: 2003/0146726 (2003-08-01), Ishikawa et al.
patent: 1 034 968 (2000-09-01), None
patent: 11-178114 (1999-07-01), None
patent: 2000-324857 (2000-11-01), None
patent: 2002-027779 (2002-01-01), None
patent: 2002-315313 (2002-10-01), None

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