A Balanced All-Rounder—Capacitor-Run Motor
2026/02/12
Working principle
The stator is equipped with a main winding and an auxiliary winding, which are spatially offset from each other. 90 Degree of electrical angle. A running capacitor is connected in series within the secondary winding circuit. The capacitance causes the current flowing through the secondary winding to lead in phase relative to the primary winding, thereby creating a phase difference both spatially and temporally. This results in a nearly circular rotating magnetic field, enabling the rotor (squirrel-cage type) to start and operate efficiently.
Core features
Good starting and running performance: The starting torque is higher than that of shaded-pole motors, and the operating efficiency is greater (up to...). 60%-80% ).
Smooth operation and low noise: The resulting rotating magnetic field is more uniform, and vibration and noise levels are better controlled than in shaded-pole motors.
Moderate cost: The structure is simpler than that of a brushless motor, and the cost is significantly lower than that of a brushless motor but higher than that of a shaded-pole motor.
Speed regulation requires auxiliary circuits: Typically, an external speed controller (such as a thyristor voltage regulator) is needed to adjust the rotational speed.
Major household appliance applications
Washing machines: Almost all agitator-type washing machines and some mid-to-low-end drum-type washing machines use capacitor-run motors for their wash motors.
Electric fans: Most mid-range floor fans, ceiling fans, and ventilation fans use capacitor motors with adjustable speed settings.
Range hood: The motor that drives the fan blade.
Refrigerator: The compressor of a fixed-frequency refrigerator (which operates via capacitor-start).
Air conditioner: The indoor and outdoor fans of early or low-end fixed-speed air conditioners.
Pumps: household submersible pumps, booster pumps, and more.
Summary
Capacitor-run motors strike an excellent balance among performance, reliability, and cost. They serve as the “power backbone” of household appliances, covering a wide range of applications—from large white goods to various ventilation devices—and meeting the basic power requirements of most home environments.
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