single-phase synchronous motor
Quick Summary
A single-phase synchronous motor produces a revolving magnetic field from a single-phase power source. This is typically achieved by using an auxiliary winding in conjunction with a capacitor or a higher-resistance winding. For very small motors, like those in clocks, a shaded-pole construction is common, often paired with a hysteresis rotor. These motors are characterized by very low efficiency, usually under 2 percent, but also by their low cost.1
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