Electricity: motive power systems – Induction motor systems – Primary circuit control
Reexamination Certificate
2007-06-05
2007-06-05
Leykin, Rita (Department: 2837)
Electricity: motive power systems
Induction motor systems
Primary circuit control
C318S807000, C318S806000, C318S805000, C363S034000, C363S035000, C363S051000
Reexamination Certificate
active
11352719
ABSTRACT:
A circuit for protecting against controller failure wherein the controller provides control signals for controlling a DC to AC inverter fed by a DC bus and driving a permanent magnet motor, the circuit comprising a first circuit for monitoring the DC bus voltage and, in the event the DC bus voltage exceeds a first threshold due to a counter EMF generated by the motor, for producing a signal to the controller to provide a switch state to the inverter whereby the counter EMF is dissipated substantially in a motor circuit resistance of the permanent magnet motor as a result of a short circuit condition provided by the switch state of the inverter, thereby preventing the DC bus voltage of the inverter from exceeding the first threshold and causing the permanent magnet motor speed to be reduced.
REFERENCES:
patent: 4511835 (1985-04-01), Studtmann
patent: 4686436 (1987-08-01), Archer
patent: 5838127 (1998-11-01), Young et al.
patent: 6005359 (1999-12-01), Brambilla et al.
patent: 6078156 (2000-06-01), Spurr
patent: 2005/0162108 (2005-07-01), Pant et al.
Galli Giovanni
Takahashi Toshio
International Rectifier Corporation
Leykin Rita
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