초록 ▼

To control the operation of an actuator motor (48) an input signal is compared with a feedback signal at a summing junction (22) with the resultant error signal used to bias off the output of a sawtooth generator (30) by pulse width modulation in a modulator (28). The pulse width modulated signal an

To control the operation of an actuator motor (48) an input signal is compared with a feedback signal at a summing junction (22) with the resultant error signal used to bias off the output of a sawtooth generator (30) by pulse width modulation in a modulator (28). The pulse width modulated signal and three commutation signals from an optical detector (34) are input to a commutation circuit (32) that decodes the input by means of a programmed read only memory into a six state drive voltage that is applied to optical isolators (36), (40) and (44). Two of the six states from the commutation circuit (32) are input to each optical isolator that provides an output for driving a power stage. The optical isolator (36) drives a power stage (38), the optical isolator (40) drives a power stage (42) and the optical isolator (44) drives a power stage (46). Each of the power stages has an output connected to one motor lead for the delta wound motor (48) that includes velocity limit protectors (76) through (78). Commutation signals to the commutation circuit (32) are provided by the optical detector (34) that responds to the rotation of a commutation disc (102). Rotation of the rotor (54) of the motor (48) is gear coupled to a feedback potentiometer (62) having an output coupled through a compensating lead/lag network (64) to be compared with the input signal.

대표청구항 ▼

An automatic control system for a motor having at least one stator winding and a rotor comprising: input circuit means including means for selecting one of a plurality of stator windings and responsive to an input rotor position control signal, a rotor position signal, and a commutating signal that

An automatic control system for a motor having at least one stator winding and a rotor comprising: input circuit means including means for selecting one of a plurality of stator windings and responsive to an input rotor position control signal, a rotor position signal, and a commutating signal that varies with rotation of the motor; said input circuit means including means responsive to the difference between the input rotor position control signal and the rotor position signal and further responsive to the commutating signal for generating a time varying voltage for each winding of the motor; each time varying voltage having a time displacement with respect to the voltage of each of the other stator windings of the motor; a power stage for each winding of the motor responsive to the one of the time varying voltages from said input circuit means, each power stage generating a motor winding voltage for energizing one winding of said motor; each power stage including a first amplifier channel connecting one winding of said motor to a power supply, and a second amplifier channel for connecting said one winding of said motor to ground, and means for interconnecting each amplifier channel to alternatively prevent one or the other of said amplifier channels from operating in a conduction mode; said means for interconnecting including means connected from a last stage of said first amplifier channel to a first stage of said second amplifier channel for blocking the operation of said second amplifier channel during the operation of said first amplifier channel; said means for interconnecting also including means connected from a last stage of said second amplifier channel to a first stage of said first amplifier channel for blocking the operation of said first amplifier channel during the operation of said second amplifier channel; means responsive to the current through said power stage for generating a current limit signal; and limit means responsive to the current limit signal and coupled to said input circuit means to inhibit the generation of the time varying voltages.