Two-value-capacitor, induction-run motors

A schematic diagram of a two-value-capacitor, induction-run motor (also called a capacitor-start, capacitor-run motor) is shown in Figure 3.7. The auxiliary winding used for starting is also used for running. An oil-filled capacitor (C_r) capable of continuous operation is placed in series with the auxiliary winding. An electrolytic capacitor (C_s) is connected in parallel with the oil-filled capacitor while starting but is disconnected by a centrifugal switch when the motor comes up to speed. The twovalue-capacitor induction-run motor is commonly available in sizes up to 7.5 kW (10 hp) and develops high starting torque. Again, the direction of rotation can be reversed by reversing the leads, A and B, to the auxiliary-coil circuit.