Patent ID: 6181091
Filing Date: 2001-01-30
Classification: G11B,H02P

Abstract:
A system for controlling a brushless dc motor, said system comprising:a motor driver for outputting a drive current to said motor;a power supply connected to said motor driver for providing a supply voltage thereto;feedback circuits for providing feedback signals regarding a speed of rotation of said motor, and at least one of: said supply voltage level and a level of said drive current;a processor for analyzing said feedback signals and for determining if a required change in drive current to said motor will result in a saturation or near saturation condition, and, if yes, determining if a change in commutation angle of said drive current to said motor will avoid said saturation or near saturation condition and, if yes, outputting a control signal to said motor driver to change said commutation angle of said drive signal; andif said processor determines that a change in commutation of said drive current will not avoid said saturation or near saturation condition, said processor disables a waveshaping action applied by said motor driver to said drive current.