Hello everyone thanks for reading my question!For a project for school I have to describe the inner working of an ac motor of a turntable. Over the input and output of the ac motor there is a resistor (220 ohm). I would like to know what it does and why it has that value. I don't know the input voltage for sure but it's quite low. (lower then 20V)Thanks in advanceAlex.
Draw down the whole circuit here before anyone could give you help.
The resistor is there in parallel to slow down the speed of the motor. The type of circuit that turns AC into DC would be a rectifier. After the transformer the voltage is likely AC, you would send it through a bridge rectifier consisting of diodes to limit the later half of the sine wave or negative potential. The rectifier will also smooth out the voltage signal and turn it into a full on DC voltage. The resistor is in parallel to the DC motor as a load. It limits the current to the motor since it is in parallel, thus limiting the speed. Since it is a DC motor it may be limiting the back EMF that the DC motor is producing as well.
