Circuit producing actual value of electronic motor speed - is used to control variable speed motor

摘要

There is an electronic commutator which is controlled by a selector circuit connected to magnetic field sensitive components and delivering pulse signals. Magnetic field sensitive components are placed in the middle between the axes of the two stator windings. A digital-analogue converter is connected to the speed controller input. Digital pulses are applied to it through an evaluation circuit which is derived from positive and/or negative edges of pulses generated by voltage comparators from voltages induced in the stator windings and from pulse-like output signals of the selector circuit.