Variable speed control, stall detection and response system

Details Variable speed control, stall detection and response system Variable speed control, stall detection and response system

H - Electricity

02

P

H02P 7/00 (2006.01) H02H 7/093 (2006.01) H02P 7/36 (2000.01)

Patent

CA 2493741

A variable frequency drive for an AC induction motor includes a stall sensing system coupled with a voltage frequency response system. Upon sensing a rise in the current which suggests a stall, and before triggering a motor shutdown, the VFD is caused to increase the V/f ratio to the motor and thereby induce a high-torque shaking response and seek to overcome any mechanically induced stall. The motor can be cycled between a first V/f ratio and a second V/f ratio in several attempts to release the stall.

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