Which statement correctly describes a capacitor-run (permanent split capacitor) motor?

Which statement correctly describes a capacitor-run (permanent split capacitor) motor?

• A. It has no start winding; the capacitor is connected across the supply.
• B. It has a capacitor permanently connected in series with the start winding; no centrifugal switch is used.
• C. It uses a centrifugal switch to disconnect the capacitor.
• D. It is never used in fans.

Answer: (B)

Capacitor-run motors use a run capacitor permanently in series with the start winding, so the current in the start winding is always phase-shifted relative to the run winding. That constant phase shift helps create both starting and running torque and improves running efficiency and power factor. Because the capacitor stays in the circuit, there’s no centrifugal switch to disconnect it after starting, which is the hallmark difference from capacitor-start motors. These motors are common in fans and other appliances where smooth operation is desirable.

Capacitor-run motors use a run capacitor permanently in series with the start winding, so the current in the start winding is always phase-shifted relative to the run winding. That constant phase shift helps create both starting and running torque and improves running efficiency and power factor. Because the capacitor stays in the circuit, there’s no centrifugal switch to disconnect it after starting, which is the hallmark difference from capacitor-start motors. These motors are common in fans and other appliances where smooth operation is desirable.