Does ignition on the motor switch have an effect on the motor?

There should be no impact.

Does the on-turn ignition of the high-voltage motor have an effect on the motor? What is the effect on the motor.

Direct start of the high-voltage motor is to start the motor directly under full voltage conditions. If grid conditions permit, direct start can be employed. However, in the actual production process, direct start-up is rarely used due to the limited capacity of the power grid.

Due to the use of direct start, the starting current is large, so that the voltage drop is larger, and there is a greater impact on the power supply system, if the voltage drop exceeds a certain value, it may cause the upper substation to trip. Therefore, this direct start method is rarely used in actual operation.

The high-voltage motor starts directly.

The purpose of using a high-voltage soft start cabinet is to reduce the starting current, so that the motor can start smoothly and smoothly when starting, without affecting the motor, load, and power grid, so why do you need to reduce the starting current, this is from the characteristics of the three-phase squirrel cage asynchronous motor, now let's analyze the characteristics of the three-phase asynchronous motor:

1. The structure is simple, strong and durable, easy to maintain, and cheaper than other motors, so there are more users;

2. The load driven is high, and there must be a power grid of equal specifications, but the power grid is not designed according to the motor, so the power grid is very difficult;

3. The wear and maintenance cost of the equipment is high;

4. The mechanical system of the motor bears a large load;

This is the reason why users must use high-voltage soft start cabinets when choosing three-phase AC asynchronous motors, because they can not only start smoothly, but also effectively extend the life of the motor and load, reduce the cost of later repair and maintenance, and will not bring any pressure to the power grid, which can save the overall cost of the enterprise;

The above content ** network.

The side that evolves from the stator is called the primary, and the side that evolves from the rotor is called the secondary. In practice, the primary and secondary stages are manufactured to different lengths to ensure that the coupling between the primary and secondary remains constant within the desired travel range. Linear motors can be either short primary long secondary or long primary short secondary.

Considering the manufacturing cost and operating expenses, take the linear induction motor as an example: when the primary winding is connected to the AC power supply, the traveling wave magnetic field will be generated in the air gap, and the secondary will induce an electromotive force and generate an electric current under the cutting of the traveling wave magnetic field, which will interact with the magnetic field in the air gap to produce electromagnetic thrust.

If it is an electromagnetic brake, the electromagnetic coil is wired in the motor junction box:

The control brake wiring may be in the junction box, but not necessarily.

The motor with the hug brake is a YEJ type junction box with a wiring diagram inside.

The contactor is connected to the circuit of the motor is not short-circuited, it must be a short circuit of the motor winding, when the insulation aging of the motor winding is measured with a multimeter, the resistance voltage of the multimeter is also up to 9V, the motor connecting piece must be disassembled with a 1 gigaohm meter to shake the insulation resistance of each winding, if it is less than 1 megaohm, it proves that the motor is damaged.

The motor is short-circuited, change the motor.

The root of the wire is ignited, and the wiring is loose and needs to be tightened hard.

The knife gate is ignition, the gate deformation does not match the blade, and the gate can be tightened by using needle-nose pliers to straighten the gate.

Hello: 1, the starting current of the motor is larger, which is [Current ratingof5 7 times

2. The upper mouth of the main switch appears [IgnitionThe phenomenon is [Poor contact] caused by the spark of the starting current impulse.

3. Please find yourself in [Power outage] state, re-tighten the (ignited) wire.

There is a short circuit between turns!

It is the insulation of the two adjacent windings that destroy the short circuit, you can test the three-phase winding with a micro-ohmmeter and find that the three-phase resistance is unbalanced, sometimes the high-power motor may not be able to measure it, because the resistance is too small! But remove the stator and look at the coil carefully, you may be able to see traces of short circuits between turns!

The shake table can only measure whether the coil is grounded, whether the insulation between the coils is intact, if these two are okay, then it may be the place where the enameled wire inside the coil has shorts, resulting in the motor load imbalance and overcurrent.

This is a short-circuit fault between the lines of a winding, which can not be detected with a shake meter, and it is necessary to figure out that the fault winding that changes color can be seen when the end cover is opened, and the winding can only be changed in this case.

If there is no problem with the wiring, it is an empty trip, and it is immediately tripped, then the motor may have burned, and you can use a multimeter to test whether the wiring and the motor shell are on.

In addition, you can smell whether the motor has the smell of burnt paint, and whether the rotor of the motor is flexible, if it does not trip immediately, but after a while, then the motor may not be a big problem, but the motor does not rotate is wrong, the single-phase motor should check the starting capacitance and whether the motor is swept Tang, that is, the bearing is too frame rotor to the stator.

There is no impact, now the popular power generation welding machine with gasoline or diesel as fuel, electric welding work can be with small lighting, Daze power generation welding machine auxiliary power supply at least 5kw 10-20kw needs to be customized without electric welding can also be used as a generator.

As long as the capacity of the generator is sufficient, the generator drives the welding machine welding operation, which has no effect on the generator welding machine.

When the input capacity is insufficient, the no-load voltage meets the input requirements of the welding machine, and the welding machine welding belt load instantly decreases, and the input current is insufficient, which will damage the welding machine generator.

In the winding fault of the motor, there is a fault called "inter-turn short circuit", that is: in the coil wound into several turns, there is a insulation damage between several coils, so that the damaged coils are in contact with each other and energized, which is equivalent to reducing the number of turns of the coil, which will produce many fault phenomena such as large electromagnetic noise, current unbalance, and reduced output--- When this happens, the life of the motor is drastically shortened.

It will increase the running current of the motor sharply, the power will decrease, the winding will heat up rapidly, and the insulation protection will be affected.

1. First of all, check whether the insulation of the motor is normal, and check the winding of the motor with a 500V shake meter (megohmmeter), and the megaohm and above are qualified;

2. There is no problem with the motor, less than the megaohm is greater than the megaohm, the insulation is unqualified, but it is not leakage; Less than a megaohm is not zero, the motor has been short-circuited or leakage, and it is necessary to continue to check to find the cause; A zero insulation indicates that the motor has been grounded or short-circuited, and it needs to be checked to find the cause.

3. If there is no shake meter, connect a live wire into the motor coil, measure the shell with a pen, and the live wire is as bright as the live wire, indicating that the motor has been grounded or short-circuited, and you need to continue to check to find the reason;

4. Measure the shell with a pen, although there is no live wire brightness, but there is obvious brightness, indicating that the motor has leakage and the insulation is unqualified, and it is necessary to continue to check to find the reason; Measure the shell with a pen, and it is not bright or only faintly bright, indicating that there is no problem with the insulation of the motor.

5. If the motor insulation is qualified, it may be that the power supply has a phase loss, the power supply voltage is unbalanced (the difference is too large), the motor or the motor line is broken, the contact is poor, etc., which need to be investigated and solved one by one.

Check whether the motor is leaking, in the case of no instrument, the simplest is to insulate the motor from the earth, and then connect the winding to a live wire, and use a digital voltage tester to test whether the chassis has voltage, yes, leakage.

If the motor trips during operation, it is often not a problem with the equipment or a problem with the power supply, and it does not rule out the protection and personnel misoperation, and the following treatment should be carried out:

1.Immediately start the standby equipment and put it into operation, and the important motor without the standby equipment can be forced to send it once. Minimize the loss and impact of motor tripping on production.

2.Measure the insulation resistance of the motor and its circuit.

3.Check whether the motor protection is working, and for low-voltage motors, you should also check whether the circuit breaker, fuse, and thermal relay are normal.

4.Inspect the motor and its circuits for signs of fire, short circuit and damage.

5.Check whether the power supply is normal.

6.Check whether the mechanical part is normal, and whether the motor bearing is damaged and holds the large shaft.

7.Whether someone mistakenly touched the protection or accident button.

Motor tripping is when the motor or line is faulty, the current changes abruptly, which causes the protection switch to automatically disconnect. The causes of motor tripping are mainly divided into several categories, such as line short circuit, load overload, and excessive motor current caused by mechanical failure.

1. Look at whether there is any abnormality in the process of observation, which is mainly manifested in the following situations. When the stator windings are short-circuited, you may see smoke coming from the motor. When the motor is severely overloaded or out of phase, the speed will slow down and be heavier"Buzz"Sound.

The motor is operating normally, but when it stops suddenly, you will see sparks coming from the loose wiring; Phenomena such as a blown fuse or a stuck component. If the motor vibrates violently, it may be that the transmission device is stuck, the motor is poorly fixed, the foot bolts are loose, etc. If there are discoloration, burn marks and smoke marks at the contact points and connections in the motor, it means that there may be local overheating, poor contact at the conductor connection, or burned windings.

Second, the listening motor should be uniform and light during normal operation"Buzz"sound, no noise and no special sounds. If the noise is too large, including electromagnetic noise, bearing noise, ventilation noise, mechanical friction sound, etc., it may be a precursor or fault phenomenon. In the case of electromagnetic noise, if the motor makes a high and low and heavy sound, there are several possible causes.

1) The air gap between the stator and the rotor is uneven, and the sound is high and low and the interval between the high and low tones remains unchanged, which is the bearing grinding.

Damage is caused by the misalignment of the stator and the rotor.

2) Three-phase current unbalanced. This is the reason that the three-phase winding has misgrounding, short circuit or poor contact, etc., if the sound is very dull, it means that the motor is seriously overloaded or out of phase operation. (3 lines) The core fixing bolt is loose due to vibration, causing the core to loosen and make noise.

2.For bearing noise, it should be monitored frequently during the operation of the motor. The listening method is as follows:

Hold one end of the screwdriver against the bearing mounting area and the other end close to your ear to hear the bearing running. If the bearing is operating properly, the sound is continuous and small"Rustle"sound, there will be no high and low changes and metal friction sound. The following sounds are abnormal.

1. The capacity of the protection switch is too small.

2. The motor is short-circuited.

3. The motor is overloaded or stuck.

Tripping is the safe operation of the traction power supply system that supplies power to the electric locomotive and 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".

Reasons why the motor trips as soon as it is loaded:

1. The air switch of the vibrating motor and the overcurrent protector do not match or are aged.

2. The outlet cable of the vibrating motor is broken.

3. The performance of the magnetic circuit of the vibrating motor decreases, resulting in excessive current.

4.The bearing is damaged or lacks oil and jams, resulting in load.

5. There is a problem with the power supply of the vibrating motor, or the circuit breaker is aging.

An electric motor is a device that converts electrical energy into mechanical energy. It uses an energized coil (that is, the stator winding) to generate a rotating magnetic field and acts on the rotor (such as a squirrel cage closed aluminum frame) to form a magnetoelectric dynamic rotational torque. The motor is divided into DC motor and AC motor according to the different power sources, and most of the motors in the power system are AC motors, which can be synchronous motors or asynchronous motors (the magnetic field speed of the stator of the motor is not synchronized with the rotation speed of the rotor).

1. Whether the motor is burned out can be checked with a shake meter. If necessary, measure the DC resistance of the three-phase winding and check the balance.

2. Whether the cable is damaged or not, the shake table is also used.

3. Whether the protection settings are appropriate.

4. The load is too large to start, such as the fan load is not closed tightly, the pump is started with load, etc.

5. The system voltage is too low.

6. Circuit breaker failure.

7. Check the leakage of the motor, since it is said that it is used for watering, it is easy to leak.

First, the motor itself has poor coil insulation, leakage or inter-turn short circuit, and the multimeter can roughly judge whether there is a problem; Second, the contactor trips due to the failure of the thermal relay itself or the small current setting; Third, the aging of the cable is caused by the phenomenon of leakage and short circuit.

If the no-load jog switch does not trip, it means that the fault is not on the motor. And what about in **? The attention is not on the motor, it should be on the contactor, focusing on the detection of the contactor coil circuit, of course, some contactors have only one coil inside.

There are also contactors with special circuits to see if the coil is short-circuited, whether it is grounded, and whether the screw is loose. These are all causes of tripping. If it also trips, replace the contactor of the same type first.

If you trip again, you will change to a switch that can withstand the current. The normally open and normally closed point next to the contactor can also sometimes cause short circuits.