Judgment and treatment of capacitor failure of bathtub pump motor

Capacitors are electrical components,It is a wear part in capacitor-run motors,Failures caused by capacitor problems are more. This article describes the fault judgment and treatment caused by capacitor problems, hope to give you some help.

1. capacitor motor(Most bathtub pumps have this form of motor)priming processThe

All single-phase motors are not self-starting, i.e. they have no starting torque. To make a single-phase motor spin up automatically, weA starter winding can be added to the stator, which is spatially separated from the main winding by 90 degrees, the starting winding should be connected in series with a suitable

(used form a nominal expression)capacitors, so that the current with the main winding is approximately in phase with the main winding 90 degrees, known as the split-phase principle. In this way two phases that are in timediffer from 90 The electric current flowing through two spatially different 90 degree windings, will spatially produce a(both sides)Rotating magnetic field, under the action of this rotating magnetic field, the rotor can be automatically started.

When the rotor is at rest, these two rotating magnetic fields produce two equal-sized torques in the rotor in opposite directions, making the synthesized torqueis zero, so the motor cannot rotate. When we rotate the motor in a certain direction with an external force (clockwise rotation)This时转子与顺时针旋转方向的旋转磁场间的切割磁力线运动变小；转子与逆时针旋转方向的旋转磁场The motion of the cutting magnetic lines of force between them becomes greater. Thus the equilibrium is broken, and the total electromagnetic torque produced by the rotor will no longer be zero, and the rotor will spin up in the direction of propulsion.

1. Troubleshooting for problems with capacitors.

1) If the motor is energized and can't rotate with electromagnetic sound, and the rotor is not jammed, this can be judged as a capacitor or starter winding problem.

        (1) The motor is energized (energized electromagnetic sound in the motor) and will not start.

        (2) After power failure, use a screwdriver to turn the shaft at the air blade end of the motor, and it turns smoothly.

     2) If the motor rotor is stationary and the motor cannot be started, and the motor is rotated by an external force (or the motor has inertia and does not stop), the motor can be started.Initiation. At this time, the motor is running in a single winding (main winding), the steering of the motor is random, and the electromagnetic sound of the motor rotation is large.The performance of the motor is reduced. It can also be determined that the problem is with the capacitor or the starter winding..

pass (a bill or inspection etc) The phenomenon of step 1) or 2) can be judged as a capacitor or starter winding problem.

2. Handling of malfunctioning capacitorsThe

1) Pump cut off the power supply, observe the motor nameplate, note down the model number of the electric pump(MODEL)Voltage(V)frequency((Hz),capacitors(CAP)

 (used form a nominal expression)quantitative (science)(xx uF)pressure resistance(xx V).

2) Remove the motor's wire box cover(If necessary, due to the limited space in the bathtub, the electric pump can be removed to affect the operation), observe the capacitance of theexterior, whether deformed, burnt, etc., if the surface of the capacitor damage capacitor must be damaged. Remove the capacitor (pay attention to the terminals)

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