H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/112
H02P 7/29 (2006.01) H02P 6/14 (2006.01)
Patent
CA 1290392
PWM SYSTEM FOR ECM MOTOR ABSTRACT OF THE DISCLOSURE A pulse width modulation control system for an electronically commutated motor (ECM) adapted to be energized from a DC power source includes a power switching system coupled in circuit with each winding stage terminal of the ECM for selectively coupling each terminal to the DC power source for applying a DC voltage to selected ones of the winding stages of the ECM in a preselected sequence to effect energization of the ECM. m e control system includes signal processing circuitry for generating switching signals for identifying selected power switching devices for energization in order to connect each terminal of the ECM to the power source in the preselected sequence. A Pulse width modulation (PWM) circuit generates PWM enable signals for energizing the selected power switching devices and includes a clock for generating periodic clock signals defining sequential clock intervals of predetermined duration. A logic circuit is coupled to the PWM circuit for limiting the cycling of the PWM enable signal to once per clock interval. In the disclosed method, a pulse width modulation enable signal is summed with control signals to each of the power switching devices for energizing the ECM winding states in the preselected sequence. The PWM enable signal is terminated when current in the winding stages reaches a predetermined value and the PWM enable signal is then inhibited for at least a time duration of a one of the clock signals if the termination has occurred within a predetermined time interval of a one of the clock signals. If current in a winding stage has not reached the predetermined value at the time that a clock signal is generated, the PWM enable signal is terminated for at least a predetermined minimum time period. Additionally, the PWM enable signal may be inhibited for another predetermined minimum time period during each PWM cycle.
579528
Company General Electric
Craig Wilson And Company
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