Engine control for electronically commutated DC motors to compensate torque notches

摘要

A digital motor control signal (CPWM) is applied to a compensating circuit (1) for integration (2) and OR-gating (3) with the output from a D flip-flop (5) which is reset by a comparator (4) of the integral with a reference voltage from a resistive divider (R4,R5). When the output (Q) of the flip-flop is high a transistor (T) connecting the integrator output to the positive rail (+Ub) is cut off. When the output is low, this transistor conducts and discharges the output capacitor (C2) of the integrator.