Pulsewidth modulated speed control of brushless DC motors
Askinas, Andrew A.
Gerba, Alex, Jr.
Thaler, George J.
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Until Eecently, few alternatives existed for the use of hydraulic and pneumatic actuators in primary flight control a jpiication-,. t;ith the advent of the samarium-c)balt permanent magnet brushless dc motor, consideration must now b" given to the utilization of an electromechanical actuator in missiles which require significant ma;ieuvering capability and hence, greater torgues. Tiis taesis investigates tL _ theory and techniques of Eulse width modulated speed control of brushless ic motors. After describing basic pulse wiith modulation (P?;ll) concepts, two constant velo:ity cortrol schemes are presented: current feedback and a limit cycle scheme. By calculating the motor form factor (a figure of merit for power losses in the switching transistors waicI, comprise the P2WM network), the relative worth of each scheme is then evaluated. An in depth study is conducted of the limit cycle approach, with an emphasis on the power loss reductions obtained through the reduction of "he velocity limit settings.
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