Its a squirrel cage motor from a microwave fan. It has five wires; white, yellow, orange, red, and blue. Inside, it has 16 electromagnets on the stator. How is this motor used?
This may be a multi speed (3) motor and they are using one speed of it. The mfg uses one motor in many different appliances. Does this uW have an exhaust fan which runs on differet speeds? The colors mean nothing in general. I assume that Yel Org are common and Red, Yel, Blu are (3) speeds. Powering it up one way is CW and the other way is CCW. Examining the cage will tell you which way to turn it.
It is probably a stepper motor. It will be driven from a digital logic circuit. It has the advantage that it's speed is completely variable. One of the wires is probably a common and the windings are arranged in a star formation. The remaining four wires yield 16 permutations. There may be some digital logic inside the motor.
This looks like it might be a stove-hood fan motor for the type of microwave that is combined with a stove hood. If that is true, there are probably three speeds. Small fan motors are often shaded-pole motors. A shaded pole motor has only enough starting torque to start the fan it is designed for - not much torque. It could also be a permanent-split-capacitor (PSC) motor. That design has a little more starting torque, but still not MORE THAN would be needed for something like a fan or centrifugal pump. If it is that type and you don't have the capacitor, you would have virtually zero starting torque and the motor would run in whichever you give it a push to get is started. [corrected my error later] When you salvage a motor from an appliance, it is always good to look carefully to see how the wires are connected and salvage the switch and any capacitors or other external items connected to the motor. The speed is changed in this type of motor by connecting at several points on the winding to use only part or all of the stator winding. That is equivalent to running the motor on lower voltages. Operating on lower voltages weakens the motor so that the load slows the motor down. It takes less torque to run a fan at a slower speed, so the motor slows down until it find the speed at which the torque that the motor can produce matches the torque required to operate the fan.
