Single Phase Electric Motors

Single Phase Electric Motors – General and Definite Purpose. Manufactured by ABB/Baldor, Century, Leeson, Marathon, Lincoln, and WEG

Single Phase Alternating current (AC) induction motors are distinguished mostly by the way they are started and the torque they develop. Shaded Pole motors have low starting torque, low cost, low efficiency, and no capacitors. PSC (Permanent Split Capacitor) motors have applications similar to shaded pole, except much higher efficiency, lower current (50% - 60% less), and higher horsepower capability. PSC motors have a run capacitor in the circuit at all times. Split Phase motors have moderate to low starting torque (100% - 125% of full load), high starting current, no capacitor, and a starting switch to drop out the start winding when the motor reaches approximately 75% of its operating speed. Capacitor Start motors are designed in both moderate and high starting torque types with both having moderate starting current, high breakdown torques. Capacitor Start/Capacitor Run motors have applications and performance similar to capacitor start except for the addition of a run capacitor (which stays in circuit) for higher efficiency and reduced running amperage.