Capacitor-run Motor

A capacitor-run motor, also known as a permanent split capacitor (PSC) motor, is a type of single-phase alternating current (AC) induction motor designed to operate efficiently from a single-phase power supply. It features a run capacitor permanently connected in series with an auxiliary (or start) winding, which creates a phase shift between the currents in the main and auxiliary windings. This phase difference generates a rotating magnetic field, enabling the motor to start and run without the need for a centrifugal switch or additional starting mechanisms.

Unlike capacitor-start motors, where the capacitor is disconnected after the motor reaches a certain speed, the capacitor in a run motor stays in the circuit throughout operation. This design provides several advantages, including smoother and quieter performance, higher efficiency, better power factor, and moderate starting torque (typically 30-150% of full-load torque). However, it may have lower starting torque compared to capacitor-start variants, making it less suitable for high-inertia loads.

Capacitor-run motors are widely used in household and light industrial applications, such as fans, blowers, air conditioning condenser fans, refrigerators, washing machines, and small pumps. They are valued for their reliability, low maintenance, and ability to run continuously without overheating the windings. 

Wanco Motor is specialized in manufacturing capacitor-run motor, we understand how to tweek and adjust the design to fit in your use. Contact us to get your most suitable motor