I'm experimenting with controlling the transport of an old super-8 film projector via Arduino. My current solution starts/stops the motor by simply switching the projector's pause button via relay, which gives me one-directional control and one speed.
But I want to control both the direction and speed of the motor. The projector has buttons for forward/backward and a wheel connected to an adjustable resistor for speed, but the best thing would be if I could override these (late 1960s) controls entirely and drive the motor directly from the Arduino.
So I'm asking two things.
a) Help identify the type of motor, as I have no idea (my guess would be some AC type..?)
It says 55W / 7000rpm on the motor, and it appears that it runs on mains voltage. The big transformer to the right appears to be only connected to the lamp.
Here is a picture of the motor:
Beneath the motor is its switchboard, on the rear side of which are the user-buttons. The 4 leftmost wires connect to various locations on the motor (coils?).
This is hard to see in the pictures, but the two round capacitors are both connected to the motor's outer frame, one connects to the black wire towards the motor, the other is connected to the blue wire at the right side of the switchboard.
So there's 3 wires leading to the switchboard which are not connected directly to the motor. The rightmost (black) comes from that voltage switch beneath the power inlet. The blue one also comes from the voltage switch, after passing the speed control (adjustable resistor) first. The brown wire is connected to the rightmost pin of the power inlet.
Here is a closer look at the wiring:
b) What would a control circuit look like and what parts do I need? I guess I need a special driver unit capable of handling the 240V mains voltage?