With a dc source inductive load you simply put a diode pointing back to the battery which clamps the spike voltage at the diode voltage.
However this cannot be done with an ac source.
Does anyone know how to stop voltage spikes with an ac source inductive load such as a 240vac electric motor? This must be for turning on and off the motor. I blew up a zero crossing triac optocoupler which had a resistive load when I connected a 240vac electric motor to the L and N terminals and switched on the motor.
At the moment I see no other way than to use a separate power lead for the motor and the power lead to the resistive load which is controlled by the optocoupler. I hope that the spike would not travel down the power lead of the motor to the power lead of the opto.
My application requires the motor to be on at full mains power while the opto controls the resistive load.
However this cannot be done with an ac source.
Does anyone know how to stop voltage spikes with an ac source inductive load such as a 240vac electric motor? This must be for turning on and off the motor. I blew up a zero crossing triac optocoupler which had a resistive load when I connected a 240vac electric motor to the L and N terminals and switched on the motor.
At the moment I see no other way than to use a separate power lead for the motor and the power lead to the resistive load which is controlled by the optocoupler. I hope that the spike would not travel down the power lead of the motor to the power lead of the opto.
My application requires the motor to be on at full mains power while the opto controls the resistive load.