Electromotor having revolution speed control - has electromagnetic coil pick-up with amplified feed back to motor power leads

摘要

The electromotor is especially for the driving of household equipment, has an electronic circuit to control the motor speed to render it independent of applied load. Opposite the end of the driving spindle (32) is a six pole conductor plate on the side of which is attached on coil (50) and two permanent magnets. The coil has leads connecting it to a rectifier (17) and a condenser (18) which are capacitor connected with a potentiometer (19). The output of this is responsive to the rotation speed of the motor and controls the voltage level applied through a transistor (23) and a rectifier bridge to the electromotor supply leads.