Where is the capacitor connected in a capacitor start motor?

Where is the capacitor connected in a capacitor start motor?

• A. In parallel with the start winding
• B. In series with the start winding
• C. Between the motor and the power supply
• D. At the motor's ground terminal

Answer: (B)

In a capacitor start motor, the correct connection for the capacitor is in series with the start winding. This configuration is crucial because it allows the motor to generate a higher starting torque. When connected in series, the capacitor creates a phase shift in the current flowing through the start winding, which results in a rotating magnetic field. This field is necessary to initiate the motor's rotation. Once the motor reaches a certain speed, typically around 70-80% of its full speed, a centrifugal switch or an electronic relay disconnects the capacitor from the circuit, allowing the motor to run efficiently on the main winding alone. This design feature is a key characteristic of capacitor start motors, providing them with enhanced starting performance compared to motors without such a system.

In a capacitor start motor, the correct connection for the capacitor is in series with the start winding. This configuration is crucial because it allows the motor to generate a higher starting torque. When connected in series, the capacitor creates a phase shift in the current flowing through the start winding, which results in a rotating magnetic field. This field is necessary to initiate the motor's rotation.

Once the motor reaches a certain speed, typically around 70-80% of its full speed, a centrifugal switch or an electronic relay disconnects the capacitor from the circuit, allowing the motor to run efficiently on the main winding alone. This design feature is a key characteristic of capacitor start motors, providing them with enhanced starting performance compared to motors without such a system.