AN IR SENSOR BASED UNIVERSAL MOTOR SPEED CONTROL DEVICE

摘要

The present invention provides a speed control device for a single phase motor used in home appliances comprising an IR source to produce an infra red rays; a motor provided with means for periodically directing infra red rays to generate a sensor output; an IR sensor provided along the path of infra red rays to sense the IR rays, periodically transmitted by said source and provide a pulsed output to the electronic control board; an electronic control board for receiving the signal from the sensor, conditioning and providing signal to motor for controlling the speed; a user interface electrically connected with the motor to select the required speed of the universal motor; a power supply unit to supply power to said speed control device; a motor driver circuit to drive the said motor; and a computing means to compare the pulsed output with required speed, to calculate the firing angle of the motor driver circuit and supply the required power pulse to motor driver circuit.[IN-DEL-2005-03148A]