REVERSIBLE DC MOTOR DRIVE INCLUDING A DC/DC CONVERTER AND FOUR QUADRANT DC/DC CONTROLLER

摘要

A reversible DC motor drive (440) includes a DC/DC converter (60) having a DCinput (66,68), a first output (78) having a first pulsed DC voltage and firstDC voltage value, a second output (102) having a second pulsed DC voltage andsecond DC voltage value, and a third output (110) having a third pulsed DCvoltage and third DC voltage value. The first and second outputs (78,102) areadapted for electrical interconnection with armature terminals (138,140) of aDC motor (134,62,450), and the third output (110) is adapted for electricalinterconnection with a field terminal (146) of the motor. A microprocessorroutine (362) calculates motor speed from the motor armature voltage, fieldcurrent and armature current. An outer control loop (246) for motor speed andtwo separately controllable inner control loops (250,346) for armature andfield current control the DC/DC converter responsive to the calculated motorspeed and a speed reference (352) in order to independently control the threeDC voltage values.