H - Electricity – 02 – P
Patent
H - Electricity
02
P
H02P 7/28 (2006.01) A61B 17/32 (2006.01) H02H 7/08 (2006.01) H02H 7/085 (2006.01) H02P 6/00 (2006.01) H02P 6/08 (2006.01) A61B 19/00 (2006.01)
Patent
CA 2117817
A wholly digital control for a motor having an armature is provided herein. Such system includes a main digital signal processor for supplying a digital input command signal indicative of a desired motor operation. Such system also include a drive controller in digital communication with the main processor, for generating, for each phase of the motor, and in response to the digital input command signal, a digital commutation signal to move the armature, and a digital pulse width modulated signal having a duty cycle established by the input command signal. Such system also include switching means in digital communication with the controller, for generating, for each phase, and in response to each commutation signal and each pulse width modulated signal, a digital two-state control signal having an on-state which lasts for the duty cycle. Such system also include means in digital communication with the controller, for generating, for each phase, a digital tachometer signal indicative of armature position. The controller is further operative for processing the tachometer signal, to generate a digital output signal indicative of the actual armature speed or position, and for communicating the digital output signal to the main processor. The controller further includes a look-up table having bit patterns, each corresponding to a different armature position.
Borden Ladner Gervais Llp
Krause Kenneth W.
Smith & Nephew Inc.
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