What's the capacitor on the power tools?
Start the motor. Hand to turn and start, then you can judge the capacitance is not enough or invalid.
Have an even single-phase motor is an elliptical magnetic field, because it is not a rotating magnetic field, so does not start to. At this time, the rotor must be pulled by hand by half circle, or by the starting winding plus capacitance, so that the rotor rotates half circle, began cutting the magnetic field lines, resulting in rotor current to begin normal rotation. There is also a capacitor motor. When the motor is started, the capacitor is kept open, and he and the starting winding are involved in the operation, which means increasing the power of a small motor.
The capacitor on the power tool is the starting function of the single-phase motor.
