H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/103
H02P 27/04 (2006.01) H02M 7/5387 (2006.01)
Patent
CA 2027983
A polyphase AC motor drive system comprises an electric power inverter and control means which enables operation in, and allows smooth transition between, a current controlled PWM mode and a quasi-square wave mode of operation. At low motor speeds, the system operates in PWM mode. At higher speeds, above the corner point speed of the motor, the system operates in a quasi-square wave mode. Smooth transitions between modes of operation are controlled by a microcomputer which counts the number of current chops made by a switching device in a preselected phase leg of the inverter over a time interval that varies with the desired fundamental period of the motor current. As speed increases and approaches the corner point, the number of chops decreases below a first predetermined number, and the system transitions from PWM to quasi-square wave mode. As speed decreases, the number of chops increases above a second predetermined number (larger than the first), and the system transitions back to PWM mode. A motor speed command is limited by an adjustable clamp circuit, depending upon the DC link voltage, resulting in a robust drive that is not affected by utility brownouts or line transients.
King Robert Dean
Szczesny Paul Michael
Company General Electric
Craig Wilson And Company
LandOfFree
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