What should I do if the motor is short circuited? Is it possible that the wires burned out and conne

If the wire is burned out and short-circuited, it will have no effect on the motor itself, but will only burn out the wire or cause the air switch to trip;

If there are several situations of internal short circuit in the motor: 1. Short circuit between windings, the winding of the general AC motor is wound on the stator with a very thin copper wire with insulating paint according to a certain rule, and each copper wire is close together, if the load is too large or the use time is too long, the insulating paint will be heated or aging and fail to cause a short circuit to each other, of course, the violent vibration of the motor will also cause the insulation layer of the winding to be damaged, and this situation can generally not be used again; 2. The winding and the motor stator (shell) are short-circuited, the reason is basically the same as 1, the difference is that if there are more than 2 turns of the winding and stator short-circuit at the same time, an inter-turn short circuit is formed, if there is only one turn and the stator short circuit, it will only make the motor leakage, but the motor can still run. If the winding insulation of the motor is only a small part, it can be used after wrapping with insulating paper to continue to use, if there are more damaged parts or the entire winding has been burned and damaged, as long as the stator trunking is not damaged, it can also be rewound around the generator winding for repair, if the stator trunking has been damaged, the motor will only be scrapped.

Please refer to the 2nd floor for the test method.

The short circuit of the motor may be caused by the damage of the internal insulation of the motor, the short circuit may be caused by water ingress into the motor junction box, and the short circuit may be caused by water ingress of the cable or cable nose between the motor control cabinet and the motor.

If it is confirmed that the wires are burned out and connected together and cause a short circuit, you can deal with it as follows:

Disconnect the power supply immediately, pay attention to safety when disconnecting the power supply, and do not have an electric shock accident because of the rush to repair.

Clean the motor junction box, check whether there are burned wires in the junction box, and replace them in time if there are any.

If the internal insulation of the motor is damaged, the motor needs to be replaced.

Check whether the cable between the control cabinet and the motor is damaged or burned, and replace the cable in time if so.

After the repair is completed, a test is carried out to ensure that the motor is working properly.

First see if the motor has any traces of burning and blackening, smell whether there is a mushy smell inside, if it is a short circuit in the external wire, it will not burn the motor, it will only cause tripping.

If the accident has been a long time, and the external wires of the motor are not damaged, it is recommended to use a multimeter to measure the resistance of the motor winding, the normal resistance is basically zero, otherwise the winding itself is burned out, and then measure the resistance between the three-phase windings, the normal is infinite, otherwise the windings are burned out.

If these are normal, then check the resistance between the three-phase and the case, the normal is infinite, otherwise it is a short circuit between the phase wire and the case.

If it's okay, it's your empty opening problem.

1) The grounding caused by moisture in the winding should be dried first, and when the hunger is cooled to about 60-70, the insulating paint on the Kai section should be poured and then dried.

2) When the insulation at the end of the winding is damaged, re-insulate at the grounding place, paint it, and then dry it.

3) When the winding grounding point is in the slot, the winding should be rewound or part of the winding components should be replaced.

Finally, the megohmmeter should be used to measure and meet the technical requirements.

When the motor winding is short-circuited, due to the uneven distribution of the magnetic field of the ions, the three-phase current is unbalanced, and the vibration and noise of the motor are aggravated during operation, and the motor can not be started when it is serious, and a large short-circuit current is generated in the short-circuit coil, which causes the coil to heat up quickly and burn out.

Why does the motor coil not short circuit when connected to power, hello! When there is a current in the wire, it will produce a magnetic field around the wire, and this magnetic field will hinder the current change in the wire, but the single strand wire has a very small effect on the obstruction section in the air, so the voltage is directly added to the wire, which will produce a large current, resulting in a short circuit, and the wire is coiled around the wire, which is equal to gathering the magnetic field around the wire, the more turns, the stronger the obstruction effect, and the magnetic permeability of the iron core is much better than that of air. It is understood that the addition of the iron core can greatly improve the hindrance effect of the magnetic field on the current change, so the motor winding will not cause a short circuit when the power is turned on. But everything has a quantity problem, if the structure of the motor or the data setting is not reasonable, there will still be problems.

Hope it helps!

If the motor is short-circuited, the first thing to do is to stop the work of the motor in time to prevent more serious consequences.

Then, the cause of the short circuit needs to be found. This may involve checking whether the insulation of the motor circuit is broken, whether the motor is overloaded, whether the operation of the motor controller is normal, and whether there are any anomalies in the environment in which the motor is installed, etc.

Once you have found and resolved the cause of the short circuit, you can try restarting the motor, but make sure that all the issues have been thoroughly resolved before attempting to start to prevent the short circuit from occurring again.

1. Long-term overload operation, the heating of the motor promotes the aging and cracking of the insulation of the enameled wire, and the insulation performance decreases, resulting in breakdown and short circuit. 2. The motor is stalled for a long time, the coil heats up rapidly, and the insulation layer of the enameled wire burns out at high temperature, causing a short circuit. 3. When the motor is damp, the insulation resistance of the enameled wire decreases, resulting in the breakdown of the interphase voltage, the damage of the insulation layer, and the interphase short circuit.

4. The motor power supply is out of phase, and the motor current is too large, which burns the interphase coil and causes a short circuit. And so on and many other reasons.

The enameled wire insulation in the motor is aging and is broken down.

1. Definition of winding short circuit: due to insulation damage caused by excessive motor current, excessive power supply voltage fluctuation, single-phase operation, mechanical bruising, poor manufacturing, etc., it is divided into inter-turn short circuit and interphase short circuit of winding.

An inter-turn short circuit is when two turns of wire connected in series in a coil are short-circuited due to a rupture of the insulation;

An interphase short circuit is a short circuit caused by a short circuit due to a damaged insulation layer between adjacent coils, a short circuit between the two leads of a pole phase group, and a short circuit between the two phases of a three-phase winding due to insulation damage.

2. Definition of open winding: open circuit is called open circuit, which is due to poor welding or the use of corrosive flux, and it is not cleaned after welding, which may cause pot welding or loosening; When the coil is short-circuited, short-circuited and grounding fault can also be burned out by mechanical stress or collision, when one or several wires are short-circuited in several wires that are burned together, the temperature of the other wires rises due to the increase of current, causing the winding to heat up and break the circuit.

Generally, it is divided into a one-phase winding end disconnection, inter-turn short circuit, parallel branch circuit break, multiple wires and burn one open circuit, and rotor broken cage.

A short circuit is a short circuit when the neutral wire and the live wire touch together (the neutral wire and the live wire do not pass through a large enough resistance) When they touch each other, it is a short circuit An open circuit is an open circuit with a break point in the middle of a wire It is an open circuit If a wire is broken, there is no resistance, it is an open circuit The burning group is, there are several windings in a motor, and one of the windings is open!

The motor windings are connected together one by one, and the turns are called turns between the circles, and the short circuit is said to break down between the turns and turns, that is, they are directly connected together. An open circuit is when there is a break in the coil, but it is not communicating with the adjacent coil. It is also equivalent to two points on an ordinary switch, but the switch is in the closed position.

Friend, the short circuit of the motor winding is the inter-turn breakdown short circuit of the coil or the interphase breakdown short circuit of the coil. An open circuit means that the coil is broken, that is, the coil is disconnected and there is no connection.

In fact, it is the same as a short circuit and an open circuit of the circuit. A short circuit can be a short circuit between a coil and a coil (a short circuit between turns) or a short circuit between phases. To open the road is to break the line.

The open circuit is the coil inside the disconnected guest! A short circuit is a line shorted together! will burn the coil!

In the event of an inter-turn short circuit of the motor, there will be the following phenomena: 1) a large circulation current (often 2 -10 times of the normal current) will flow through the short-circuited coil, which will cause the coil to heat up seriously; 2) The three-phase current is unbalanced, and the motor torque is reduced; 3) Produce noise; 4) When the short circuit is serious, the motor cannot be started with load. In the beginning of an inter-turn short circuit, only two wires may be in contact due to the erosion of the insulation at the intersection.

Due to the circulation in the short circuit turn, the coil heats up rapidly, which further damages the insulation of the adjacent wires, so that the number of turns of the short circuit continues to increase and the fault expands. When the number of short circuit turns is sufficient, the fuse will burn out, and even the winding will burn and smoke. When there is an inter-turn short circuit in one phase of the three-phase winding, it is equivalent to a decrease in the number of turns of the phase winding, and the stator three-phase current is unbalanced.

The unbalanced three-phase current causes the motor to vibrate and at the same time emit an abnormal sound. The average torque of the motor decreases significantly, and it appears weak when dragging the load.

Causes of short circuit in winding:

1. The motor is overloaded for a long time, the motor temperature rises, and the magnet wire insulation aging loses its insulation effect;

2. The insulation of the magnet wire is damaged when the wire is embedded;

3. The insulation resistance of the winding decreases due to moisture, resulting in insulation breakdown;

4. The end and interlayer insulation materials are not properly padded or damaged when shaping;

5. The insulation of the end connection wire is damaged;

6. The insulation between the motor leads is damaged;

7. The overvoltage of the switch operation causes the insulation to break down;

8. The end of the rotor and stator windings rub against each other and cause insulation damage;

9. Metal foreign bodies fall into the inside of the motor;

10. The coil is too oily and the insulation is corroded.

It means that most of the time it is overload, whether the switch is hot after tripping, and it takes a few minutes to push it on, if it is, it is overload.

In the case of leakage protector, if there is a short circuit, it will automatically trip to protect the power supply.

The safe operation of the traction power supply system that supplies power to the electric locomotive should be ensured. In the event of an accident, the relay protection device installed in the traction substation (opening and closing station, partition pavilion) will be activated by the short-circuit current generated by the accident, and the circuit breaker that supplies power to the accident point will be automatically disconnected, so as to reduce the scope of the accident and ensure the safe operation of other equipment and the normal power supply to the non-accident line. This action of automatically disconnecting the circuit breaker due to an accident is customarily called "tripping".

The closing coil or closing contactor is broken.

1. If the control loop trips, it is a short circuit in the internal coil of the contactor, or an air opening quality problem (less likely).

2. If the main circuit of the motor is empty, the motor will trip as soon as it starts, there are the following possibilities:

The fixed value of the thermal relay is too small;

Winding insulation damage;

winding phase break; The cable from the lower end of the contactor to the motor is out of phase or has poor contact;

It is also possible that the load is too heavy; The motor bearing is damaged (rotate by hand to see if there is any abnormal sound and see the force);

There is also a situation where the contactor contact is not in good contact (this is generally not jumped at the moment of starting, and the three-phase voltage of the contactor is balanced with a multimeter).

Haha, the circuit is not broken?

That is, the gate knife is broken.