[SOLVED] soft starter for single phase induction motor

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hoss3inf

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I was thinking how can i make a soft starter (and not speed controller) for a single phase induction motor, like in refrigerator compressors. does anybody know where should i start?
 

Refrigerators use a NTC resistor, its high in value when cold , so the current is limited until it gets hot. Problem with thermal devices is that if the mains in interrupted for a second or so, because the device is hot, there is no current limiting when the fridge restarts.
Frank
 


i didnt know about this resistor, but my problem is the shock when the compressor starts, i want it to start in low speed and increase it to reach the peak speed, what is the solution?
 

make a drive...

by varying frequency you can control the speed

u can use pwm ic like SG2535 IC or microcntroller and use igbt or mosfet for h bridge inverter.

also try with triac..

ceiling fan speed is controlled by Triac
 

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