초록 ▼

A microprocessor based control system generates optimal field and armature currents for a separately excited DC motor. The current levels for the field and armature coils are set by feedback control. Armature and field current setpoints are established in accordance with tabulated values selected fo

A microprocessor based control system generates optimal field and armature currents for a separately excited DC motor. The current levels for the field and armature coils are set by feedback control. Armature and field current setpoints are established in accordance with tabulated values selected for providing a required torque and speed in an optimal fashion. A table of corresponding values of armature voltage is also maintained. If the actual armature voltage is below the calculated value, then the field current setpoint is boosted by an amount sufficient to optimize output torque.

대표청구항 ▼

[ What is claimed is:] [1.] Apparatus for separately exciting a field coil and an armature coil of a direct current motor comprising:(a) a matrix of field current values stored in a digital memory at addresses which may be accessed by combined torque values and speed values;(b) a matrix of armature

[ What is claimed is:] [1.] Apparatus for separately exciting a field coil and an armature coil of a direct current motor comprising:(a) a matrix of field current values stored in a digital memory at addresses which may be accessed by combined torque values and speed values;(b) a matrix of armature current values stored in said digital memory at addresses which may be accessed by said torque values and said speed values, said armature current values being related to said field current values in such a way that said torque values and said speed values will access optimal combinations of field current and armature current capable of producing torques corresponding to said addresses while said motor rotates at speed associated therewith;(c) a microprocessor programmed for generating said addresses in response to speed signals and speed error signals and downloading said field current values and said armature current values;(d) a field coil driver connected for delivering field currents to said field coil at levels corresponding to said field current values, and thereby establishing a corresponding flux field;(e) an armature coil driver connected for delivering armature currents to said armature coil at levels corresponding to said armature current values, so that said armature coil generates said torques in reaction to said flux field and rotates at said speeds;(f) a speed sensor connected for sensing the speed of rotation of the armature coil and generating said speed signals in response thereto; and(g) an input circuit connected for receiving speed reference signals and generating said speed error signals in accordance with differences between said speed reference signals and said speed signals.