I have an induction motor running hot and slow in the direction it's supposed to but when I change the lead wires so it runs in the opposite direction it runs as it should. Is there any reason as to why? Could it be a problem with the capacitor? It's a single-phase 200V.
Induction Motor Problem
capacitorinduction motormotorwiring
Related Solutions
Now, how can i further simplify the equivalent circuit of the three phase motor
Try this one: -
Taken from here
For a single phase motor to be reversible, it generally must have two windings and you must have access to connections that will allow you to reverse the connection of one winding with respect to the other winding. Switching the capacitor connection has no effect. A two pole double throw switch or relay is required. If the capacitor is switched out of the circuit when the motor is at full speed, the motor must be allowed to coast to a stop or at least to a low enough speed for the switch to reconnect the capacitor before reversing. The diagram below shows the basic connections. If there is more than one capacitor, more than one voltage connection or more than one speed, reversing is more complicated.
Re last diagram in the question:
This reversing scheme will work if the auxiliary winding is identical to the main winding. The switch will put the main winding in series with the capacitor and connect the auxiliary winding directly across the power source. Some motors may be specifically designed for this reversing scheme, but it is not the typical design for this type of motor. See diagram below.
Best Answer
If the motor runs properly in one direction, you should check to make sure you are using the proper connections for forward operation. You should also consider what the load is when the motor is running in each direction. A load such as a fan or centrifugal pump may require less torque when running in reverse. If the motor is running properly when it is lightly loaded, but hot and slow when it is normally loaded, the capacitor or the starting winding may be defective.