Can a three phase motor burn after a long reversal time?

This is like this, if the forward rotation will not be, the reverse rotation will not be, the forward rotation and reverse rotation of the motor are the same, then your meaning, may be related to the equipment, some equipment is not allowed to reverse, or the reverse load increases, then it is easy to burn the motor, but there should be protection against reversing!

The reversal of the three motors does not burn the motor, to be precise, the reversal of the three motors has no effect on the motor itself.

Because the three-way motor originally supports forward and reverse rotation, the forward and reverse rotation of the three-way motor is completed by adjusting the line sequence.

The three-phase motor does not distinguish between forward and reverse rotation in terms of the motor itself, so there is no phenomenon of burning out due to steering reasons.

People often say that the three-phase motor is run before the formal operation to check whether the motor steering is correct, the understanding of this matter should be: the load side of the motor generally has steering requirements, to give some simple and easy-to-understand examples, such as the motor drives the pump to run, the centrifugal pump rotates in the opposite direction, the pumping capacity is greatly reduced; Another example is the axial flow fan, if the direction of rotation of the fan is not right (opposite), the direction of air supply is also opposite, which is originally pumping, but the result is blowing.

In the case of a three-phase motor, the steering has no effect on the motor, but some equipment (circular knitting machines, sewing machines, etc.) does not allow reversal. Therefore, after the three-phase motor is connected to the power, the steering must be approved first.

1. Move the motor to the opposite direction without any circuit adjustment.

2. The connecting circuit star-delta start, self-coupling decompression start, can only play 40% of the motor

3. The quality of the motor is poor or the main line of the building is connected incorrectly.

The function of the motor is to transmit the torque, as long as it rotates, there is no forward and negative rotation, positive and negative rotation is just the difference between people rotating in different directions.

The motor itself has the function of forward and reverse rotation, which will not affect anything, the key is the load in the back belt, if the reversal is not allowed, it will damage the machinery or the motor.

No, don't worry.

Normal motor forward and reverse rotation just changes the direction of operation.

In the case of water pumps, the reversal will affect the flow rate.

There is no foundation failure of the motor, it will not.

There is no difference between the forward and reverse rotation of the three-phase motor.

The motor will not be burned when it is reversed, and the motor is burned because of long-term overload or lack of phase.

The sudden reversal of the three-phase motor during operation is a change in the direction of the magnetic field of the motor rotation.

There are three windings on the stator of the three-phase motor, when the power supply is connected to the motor according to the phase sequence of U, V and W, the current passes through the three-phase winding and forms a rotating magnetic field of positive rotation on the stator, the rotor of the motor rotates forward under its action, when the power supply arbitrarily adjusts two of the U, V and W to access the motor, the current will form a reverse rotating magnetic field in the stator through the three-phase winding, and the rotor will rotate in the opposite direction under its action to realize the reversal of the motor.

1. Treatment method for the direction of rotation of the motor in different working environments

1. When the input is a single pulse.

The DIP switch of the signal module should be dialed to the "single pulse" position, and the motor rotates when there is a pulse output. Changing the high and low level of the direction signal can change the direction of rotation of the motor.

2. When the input is double pulse.

The DIP switch of the signal module should be dialed to the double pulse position. When the positive pulse is generated, the motor rotates forward; When a negative pulse is generated, the motor reverses; However, it should be noted that positive and negative pulses cannot be given at the same time.

2. When the motor runs in the opposite direction to the requirements, two methods are recommended for this:

One way to do this is: to change the direction signal of the control system;

Another way is to change the direction by adjusting the wiring of the stepper motor.

Here's how:

1. For two-phase motors, only one of the phases of the motor line needs to be exchanged into the stepper motor driver, such as A+ and A- exchange.

2. For three-phase motors, the motor line of one of the phases should not be exchanged, but the two phases should be exchanged sequentially, such as A+ and B+ exchange, A- and B- exchange.

Cause; 1. The motor will not be at full load.

2. During operation, a phase is suddenly broken (missing a phase), and then the motor is applied a reverse force. It will be able to rotate in the opposite direction. But it doesn't reach the rated speed. (At this point, the motor is a little hotter than usual).

If the motor is stationary, if only two phases of electricity are applied to it, it will not rotate. If you artificially let it spin in advance, and then apply two-phase electricity to it, it will be able to spin. And it is artificially made to turn it in the opposite direction first, and then apply two-phase electricity, which direction it will turn.

Theoretical explanation: Although two-phase electricity cannot form a rotating magnetic field, but; After artificially applying an external force, it rotates by this inertia.

Summary. The long-term forward transmission and reversal of the three-phase asynchronous motor are the same for the motor, and there is no harm to them. But some motor loads do not allow the motor to change direction at will.

I think you want to ask: what is the harm of long-term forward and reverse operation of three-phase asynchronous motor to the motor? Here's how:

When the forward and reverse frequency of the motor is not high, the temperature of the motor is higher than that of one-way operation, and it can run normally; When the forward and reverse frequency of the motor is very high and the load is large, the temperature of the motor will be very high during long-term operation, and there is a possibility of burning the motor.

Hello, I have seen your question and am sorting out the answer, please wait for a while Does the forward and reverse rotation of the three-phase electric motor have an impact on the motor.

The long-term forward transmission and reversal of the three-phase asynchronous motor are the same for the motor, and there is no harm to them. But some motor loads do not allow the motor to change direction at will. I guess you didn't want to ask:

What are the hazards of long-term forward and reverse operation of three-phase asynchronous motors to motors? It is like this: when the forward and reverse frequency of the motor is not high, the temperature of the motor is higher than that of one-way operation, and it can run normally; When the forward and reverse frequency of the motor is very high and the load is large, the temperature of the motor will be very high during long-term operation, and there is a possibility of burning the motor.

Summary. Dear, I am glad to answer for you: the reasons for the reversal or reversal of the three-phase motor are as follows:

According to the working principle of the three-phase motor, it can be seen that when the motor rotates normally, the rotation of the motor is driven by torque, and the direction of torque is the direction of motor rotation. Changing the direction of the internal torque of the motor must be able to change the direction of rotation of the motor. However, the torque direction is closely related to the direction of the magnetic field rotation in the internal space of the motor, that is, the direction of the magnetic field rotation is the direction of torque.

If the three-phase phase sequence of the magnetic field rotation direction is determined, changing the three-phase phase sequence can change the direction of the magnetic field rotation in the internal space of the motor. It can be seen that the direct cause of the reversal of the three-phase motor is the result of the reversal of the three-phase phase sequence.

Dear, I'm glad to answer for you: the reasons for the reversal or reversal of the three-phase motor are as follows: According to the working principle of the three-phase motor, when the motor rotates normally, the rotation of the motor is driven by torque, and the direction of torque is the direction of motor rotation.

Changing the direction of the internal torque of the motor must be able to change the direction of rotation of the motor. However, the torque direction is closely related to the direction of the magnetic field rotation in the internal space of the motor, that is, the direction of the magnetic field rotation is the direction of torque. If the three-phase phase sequence of the magnetic field rotation direction is determined, changing the three-phase phase sequence can change the direction of the magnetic field rotation in the internal space of the motor.

It can be seen that the direct cause of the reversal of the three-phase motor is the result of the reversal of the three-phase phase sequence.

It is originally a three-phase power supply, and two of the wires can be adjusted to change the motor steering! But today I came across a kilowatt oil pump motor, and the two wires of the three-phase power supply were still in the original direction.

Not sure why.

Any two of the three power cords of the three-phase asynchronous motor can be reversed and the three-phase phase sequence can be changed. It's very simple, as long as the two phases are arbitrarily reversed, the purpose of reversal can be achieved. The principle is:

The three phases A, B, and C are 120 degrees apart.

Summary. Why does the three-phase motor suddenly reverse.

Hello dear, the sudden reversal of the three-phase motor in the work is a change in the direction of the magnetic field of the motor rotation. There are three windings on the stator of the three-phase motor, when the power supply is connected to the motor in the order of U, V and W phases, the current passes through the three-phase winding and forms a rotating magnetic field that rotates in the forward direction on the stator, and the rotor of the motor is positive under its action.

If my answer is helpful to you, please give a thumbs up (in the lower left corner), I look forward to your like, your efforts are very important to me, and your support is also the motivation for my progress. Finally, I wish you good health and a good mood!

Why does the three-phase motor suddenly reverse.

Why does the three-phase motor suddenly reverse, the three-phase electric Yufu dispatch machine suddenly reverses at work is the motor rotation magnetic field direction change. There are three windings on the stator of the three-phase motor, when the power supply is connected to the motor according to the sequence of U, V and W phases, the current passes through the three-phase winding and forms a rotating magnetic field on the stator that rotates in the forward direction, and the rotor of the motor is forward under its action. Hope it helps.

If my answer is helpful to you, please give a thumbs up (in the lower left corner), I look forward to your like, your efforts are very important to me, and your support is also the motivation for my progress. Finally, I wish you good health and a good mood!

Hello. Hello.

Hello dear,