Split Phase Motor Wiring

How does a split phase motor work.

Split phase motor wiring. In construction these two windings are placed 90 apart in space. At 75 full speed the centrifugal switch opens disconnecting the start winding. Due to their low cost split phase induction motors are the most popular single phase motors in the market.

Since the start winding is disconnected from the circuit the motor is operating through the run winding. Since the starting winding is made of fine wire the current density is high and the winding heats up quickly. The main winding has very low resistance and a high inductive reactance whereas the starting winding has high resistance and low.

The main winding has characteristics of low resistance but high reactance. If the starting period exceeds 5 seconds the winding may burn out unless the motor is protected by built in thermal relay. The split phase machine has two windings from a single phase arranged in the stator.

The main winding which is highly inductive is connected across the line in the usual manner. Both the windings are displaced 90 degrees in space. A split phase induction motor is a single phase motor consists of a stator and a single cage rotor.

But a capacitor start has a different sort of winding from a split phase since the cap does the shifting. Just to be sure you have things right you might try connecting to the run terminals giving the motor a good spin and turning it on right away. The auxiliary or starting winding has a greater resistance and lesser reactance as compared to main winding.

The stator has two windings i e. Hello i spent some time looking at various posts on the forums for info on wiring a split phase resistance start motor for forward and reverse but haven t had much luck. A split phase relies on the start winding resistance to shift phase.