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The figure below describes this type of design. Motor start capacitors are used during the motor startup phase and are disconnected from the circuit once the rotor reaches a predetermined speed, which is usually about 75% of the maximum speed for that motor type. These capacitors usually have capacitance values of over 70 µF.
With each type having its own specific application that it's used for. A start capacitor attached to an AC motor sends a jolt to the motor to start it. Then a run capacitor attached to an AC motor sends a regular series of jolts that keep the motor running. Meanwhile a dual run capacitor is responsible for powering up two separate motors.
Start capacitors are responsible for increasing the starting torque of a AC motor, which in return cycles the AC motor on and off rapidly. Start capacitors stay in the circuit long enough for the motor to reach a determined speed (typically 75% of full power), and then it’s taken out of the circuit by a centrifugal switch.
start capacitor and a run capacitor are used simultaneously. start capacitor will only stay in the circuit for enough time that the motor comes to 3/4 of full speed. At this speed a centrifugal switch is released which takes the start capacitor out of the circuit. After that, a run capacitor runs the motor with greater efficacy.
Startup capacitors have values greater than 70 μF with four major voltage classifications: 125 V, 165 V, 250 V, and 330 V. Examples of motor capacitors are: a capacitor of 35 μF to 370 V or a 88 -108 μF at 250 volt start capacitor.
start capacitor will only stay in the circuit for enough time that the motor comes to 3/4 of full speed. At this speed a centrifugal switch is released which takes the start capacitor out of the circuit. After that, a run capacitor runs the motor with greater efficacy. Two electric motors are supported by a dual run capacitor.
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