Introduction to Split Phase Motor:
The motor is a two-pole motor with run and start windings in the stator.
Start winding is added out of phase to provide proper rotation direction and get the motor turning.
Operation at Startup:
Power is applied to both the run and start windings, initiating rotor movement.
Troubleshooting:
Measure resistance with an ohmmeter.
Run winding resistance (R and C terminals) should be measurable, e.g., 2 ohms.
Start winding resistance (S and C terminals) is typically higher, e.g., 8 ohms.
Winding Characteristics:
Run Winding: Located on the outer edge, connected to power.
Start Winding: Smaller wire, more turns, and connected in parallel to the run winding.
Circuit and Phase Shift:
Both windings are in the circuit at startup.
Centrifugal Switch:
Used to remove the start winding from the circuit once the motor reaches ~80% of its rated speed.
Not suitable for compressor motors due to potential damage from refrigerating oil.
Centrifugal Switch Operation:
Switch is placed in series with the start winding.
As the motor speeds up, centrifugal force opens the switch, de-energizing the start winding.
Motor continues running on the run winding alone.
Motor Type:
This split phase motor is referred to as a "repulsion start induction run motor."
Typically used for low starting torque applications.
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