A run capacitor that remains connected during operation defines which motor type?

A run capacitor that remains connected during operation defines which motor type?

• A. Permanent split capacitor motor
• B. Split-phase motor
• C. Capacitor-start induction-run motor
• D. Capacitor-start capacitor-run motor

Answer: (A)

A run capacitor that stays in the circuit during operation provides a constant phase shift to the auxiliary winding, which is what powers a smooth rotating field throughout running. In a permanent split capacitor motor, the run capacitor is permanently connected to the auxiliary winding, so this phase shift exists at all speeds and the motor runs with improved torque and efficiency without needing a start switch once it’s running. This is different from a split-phase motor that relies on winding impedance without a run capacitor, and from capacitor-start designs that use a start capacitor only for starting (and may disconnect it after startup). The continuous connection of the run capacitor during operation is the defining feature of the permanent split capacitor motor.

A run capacitor that stays in the circuit during operation provides a constant phase shift to the auxiliary winding, which is what powers a smooth rotating field throughout running. In a permanent split capacitor motor, the run capacitor is permanently connected to the auxiliary winding, so this phase shift exists at all speeds and the motor runs with improved torque and efficiency without needing a start switch once it’s running. This is different from a split-phase motor that relies on winding impedance without a run capacitor, and from capacitor-start designs that use a start capacitor only for starting (and may disconnect it after startup). The continuous connection of the run capacitor during operation is the defining feature of the permanent split capacitor motor.