CONTROL OF AIR FLOW RATE OF SINGLE PHASE INDUCTION MOTOR FOR BLOWER APPLICATION USING V/F METHOD

This paper describes the control scheme of air flow rate of single phase induction motor (SPIM) with blower application including variable voltage and variable frequency control, its implementation and test result. This scheme is developed using PWM (Pulse Width Modulation) control circuit, driver circuit and H-bridge inverter circuit. The PWM control circuit is implemented by using the SG3525A PWM IC, driver circuit, gate logic circuit, and also using BC547 transistor. Here, IC SG3525A is used as pulse width modulation IC for frequency control purpose. For proposed system the operating frequency range is 25 to 71 Hz at variable voltage and constant voltage for changing the speed of induction motor.In this paper, V/f scheme controlling the air flow rate of blower to change the speed of single phase induction motor blower drive. The hardware is implemented using PWM control circuit, driver circuit and H-Bridge inverter. The experimental tests are conducted on this drive which produces the alternating current to feed the SPIM. The practical result is verified using the above control scheme as presented in this paper.