Archive: I need an electronic circuit design to control a 240volt AC fan motor

Budget 39$ per month
Posted: 5 years ago
Closed
Description
I have a 220watt centrifugal fan motor that is controlled by a PWM (Pulse WIdth Modulator). When the motor is connected directly to a 240volt AC power supply it runs at full speed. However when I connect it to a PWM the motor speed is greatly reduced even when the power controller is tuned full on. Added to this is the fact that the motor achieves this maximum when the controller potentiometer is only half-on, when I continue to 'turn-up' the power the motor speed does not increase any further.
I think I need a 'bias' resistor of some sort to overcome this problem, with maybe a diode to stop any input from the power source feeding back into the output of the PWM. If someone could help me with a solution I would greatly appreciate it.
Many thanks, Gary
Skills:
circuit design,electronics
Category

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