Motor does not start, are startup capacitor

Single-phase asynchronous motor start capacitor is used to start the ac electrolytic capacitor or polypropylene, polyester capacitor. Then start the capacitance is broken what performance? Capacitance is broken motor will turn? How to change and maintenance, should pay attention to what?

how do you decide to start the method of capacitance is broken

1, see: see capacitance presence of bulge, the bulge;

2, listening: connected to motor to presence of buzzing sound, with his hand upon the rotor speed is slow and weak;

3, smell: some capacitance due to the excessive current burn surface has a burning smell ( Plastic shell class capacitance limits;

4, with multimeter capacitance measurement.

single-phase electric current flows through the motor does not produce a rotating magnetic field, need to take the capacitor is used to split phase, the purpose is to make two winding currents in nearly 90 ゜ phase difference, in order to produce a rotating magnetic field.

two winding capacitance induction motor, the startup winding and winding operation. Two windings by 90 degrees on the space. String on the startup winding capacity of a large capacitor, when running and start the windings by single phase alternating current (ac), because of capacitor in the startup winding current on time than the running winding current advance Angle of 90 degrees, to reach the maximum value. In time and space form two of the same pulse magnetic field, in the air gap between the stator and the rotor creates a rotating magnetic field, under the effect of rotating magnetic field, the induced current in the motor rotor, current and rotating magnetic field interact to produce electromagnetic torque, motor rotation.

to make the function of single phase electric automatic rotation, we can add a starter in the stator winding, starting with the main windings in space by 90 degrees, starting winding to concatenate a suitable capacitance, makes differ with on the phase of the primary winding current approximate 90 degrees, the so-called split-phase principle. These two on the time difference between 90 degrees of electricity flow into the two differ 90 degrees of winding on the space, will be produced in the space ( Two phase) A rotating magnetic field. Under the effect of the rotating magnetic field, the rotor can be automatic starting, after starting, to speed up certain, with the aid of an installed on the rotor of the centrifugal switch or other automatic control device will start winding disconnect, the only main winding work in normal working conditions. Therefore, starting winding can make short work. But there are a lot of time, starting winding is not broken, we call this kind of motor capacitor, single-phase motor to change this kind of motor, can be achieved by changing the position of the capacitor is concatenated.

to start a common cause of damage of capacitor is:

1, the voltage is too low;

2, overload; Low speed repeatedly start or start time.

3, peripheral environment influence; Such as the installation near the heat source heat dissipation is not good or damp environment, etc.

4, poor contact, capacitance connection is bad also easy cause burn out;

5, the centrifugal switch adhesion ( A single motor with centrifugal switch)

startup capacitor maintenance notice:

1, find out the cause of the problem;

2, can buy the same capacity, the same capacitance change;

3, can't find the same type of capacitance, find the capacitance parameter, use the same parameters in can find capacitance change.

capacitance is broken motor will turn it

start capacitance will cause the bad motor can't start, short time electricity will only buzzing sound, cause the current surge, long electrified winding serious overheating, burning motor. So it should be replaced immediately.

start capacitance change notice:

1, the processing should be fault capacitor or replacement after disconnect the power of the capacitor, disconnect switch or pull the plug, and the capacitor after discharge.

2, capacitor discharge, there will be a part of the remaining charge place, should be an artificial discharge again.

3, discharge when the grounding line termination first, reoccupy grounding rods of capacitor discharge for many times, until no spark discharge and the discharge of sound, and then to fasten on ground.

4, due to the fault capacitor may be poor contact, the internal lead wire break or blown fuse, etc. , so it is possible that a portion of the charge has not put, so maintenance personnel before contact fault capacitor, still should wear insulating gloves, with short line fault capacitor poles short answer first, and then began to remove and replace.

5, to use more than one capacitor in series, should also be separately for discharge.

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