Скачать с ютуб Induction motor, single phase, no capacitor to start needed. в хорошем качестве

Induction motor, single phase, no capacitor to start needed.

PLEASE READ DESCRIPTION This is a 2 pole, single phase, permanent capacitor, induction motor, 2 poles on the main winding 2 poles on the auxiliary, 127V, 3450rpm nominal. In this clip I show that the capacitor gives the initial torque to the motor to start, and in the case of permanent capacitor, to give extra torque while functioning. You can see that one side of the capacitor is conected to the auxiliary winding end and the other to the main winding end; this is obviously to create the phase shift btween the auxiliary and main windings, and get a phase shift of aprox 90 electrical degrees. By closing the circuit at different poles of the capacitor you change the rotating magnetic field direction and therefore the direction of the rotor. The main winding and the auxiliary one are circuits conected in parallel. The common conections on single phase splitted motors is this: The main winding is a RL circuit. The auxiliary winding is a RCL circuit. On the clip, I remove the capacitor making the auxiliary also an RL circuit reducing the phase shift, two things still happen: the auxiliary winding has still strong enough torque to start the motor, and even run it, but, since this motor does not have a centrifugal switch the auxiliary winding maintains the speed low because of the magnetic field proximity (electrical proximity in degrees) to the main one. And since the inductive reactance of the windings is different and fixed, the motor always starts in the same direction. It is not shown here that if I remove the capacitor and leave only one of the two windings I can start the motor by cranking it (I show that on another clip though), and it will turn in any direction at the same speed either using only the main or auxiliary winding but not both (it will have a different speed for each winding).