What is the stalled rotor current of the motor Is the situation the same for single phase and three

1. The rotor coil of the induction motor (including three-phase and single-phase) induction motor is a squirrel cage with a cast aluminum structure, which is in a closed state. During normal operation, the synchronous magnetic field generated by the stator coil cuts the squirrel cage coil and causes the squirrel cage coil to produce induced current, and the magnetic field generated by the induced current interacts with the synchronous magnetic field of the stator and rotates.

2. When the induction motor is stalled (and at the moment of starting), the speed of the synchronous magnetic field cutting the squirrel cage coil is the largest, and the induced current generated is also the largest, because the rotor magnetic field is opposite to the stator magnetic field, so it will cause the current of the stator winding to become larger.

3. The stator winding of the induction motor can be regarded as the primary winding of the transformer, and the rotor squirrel cage is the secondary winding, so the induction motor is also called it.

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When the secondary current increases, the primary current will also increase.

I don't know if your range hood is a single capacitor (the capacitor is similar to the battery length) If the capacitance is done, you see if the capacitor is broken, the capacitor can be measured with a capacitance meter, and the motor repair department can generally have it, if the capacitor is broken, it will be OK to change one, if there is no capacitor, it is estimated that it is a shaded pole motor (the probability of the hood will be greater) that is basically the oil upstairs is too much, then you can find a cleaning range hood to wash it If you don't wash the hood and wash it yourself, but it's very dirty, first grab the oil and wash it with caustic soda Caustic soda should be washed with hot water before washing with that water!

Be sure to bring heat-insulating gloves when washing with caustic soda, if you have a range hood, let them wash themselves, that will be a big deal! That's all there is to ask La! ～

The motor is marked with rated power and rated current, if the actual current exceeds the rated current, it is overload, the most serious overload is the stalled rotor, the exhaust fan motor power is small, the internal winding resistance is large, and the current is also small. I advise you to find someone to clean it, so as not to make you more expensive.

The three-phase current of the pro-motor is larger than the other, which may be caused by one of the following reasons: 1: The power supply voltage is unbalanced:

In three-phase electricity, if the voltage of the three-phase power supply is unbalanced, it will cause the three-phase current of the motor to be unbalanced, so that the one-phase current is larger than the current of other phases. In this case, it is necessary to check whether the voltage of the three-phase power supply is balanced, and if the voltage is unbalanced, the circuit needs to be adjusted to make it balanced. 2:

Internal fault of the motor: The winding inside the motor is damaged or the rotor is unbalanced, which will lead to the unbalance of the three-phase current of the motor, making the one-phase current larger than the current of other phases. In this case, you need to check whether there is a fault inside the motor, and if there is a fault, it needs to be repaired or replaced.

3: Motor load unbalance: The load driven by the motor is unbalanced, which will lead to the three-phase current imbalance of the motor, making the one-phase current larger than the current of other phases.

In this case, it is necessary to check whether the load driven by the motor is balanced, and if the load is unbalanced, the load needs to be adjusted to make it balanced. 4: The power supply voltage is high:

If the supply voltage is higher than the rated voltage, the three-phase current of the motor will be unbalanced, so that the one-phase current is larger than the current of the other phases. In this case, it is necessary to check whether the power supply voltage meets the requirements, and if the voltage is too high, the circuit needs to be adjusted to ensure the safe operation of the motor. In short, the three-phase current imbalance of the motor may cause damage to the motor, so it is necessary to troubleshoot in time to ensure the safe operation of the motor.

It is recommended to have a professional electrician for inspection and treatment.

The reason why the current increases when the motor is stalled is:

When the motor rotates, the rotating magnetic field formed by the stator winding drags the rotor to rotate, and the magnetic field generated by the induced current in the rotor also induces a back electromotive force in the stator winding, which is the main part of the voltage consumption.

The back EMF is zero when the motor is stalled, the motor only has its own resistance and inductance, and all voltages are loaded on the windings. The natural current will increase considerably. According to the size of the motor capacity and different processing technology, the motor stall current is generally 50-12 times of the rated current of the motor.

When the one-phase current in a three-phase motor is large, the following problems may exist:1Unbalanced voltage:

When the three-phase voltage is unbalanced, one of the phases voltage is high or low, which will lead to an increase in the corresponding phase current. This can be caused by a grid issue or a faulty voltage regulator that requires a repair or replacement of the grid. 2.

Power unbalance: When the three-phase load is unevenly distributed, the load in one phase is heavier, and the current in that phase will be larger. This can be caused by uneven load distribution or load failures, which require adjustment of load distribution or troubleshooting of faulty loads.

3.Poor phase contact: The contactor, circuit breaker and other components of the three-phase motor may have poor contact, resulting in a large current in one of the phases.

This can be caused by aging contactors, worn contact points, or loose wiring that requires maintenance, replacement, or tightening of wiring. 4.Phase Short Circuit:

When one phase in a three-phase motor is short-circuited, the phase current will be larger. This can be caused by aging winding insulation, short circuits in the windings, or internal faults in the motor. In this case, insulation testing, troubleshooting, or replacement of the motor are required.

In conclusion, when the one-phase current in a three-phase motor is large, aspects such as grid voltage, load distribution, contact points, and internal windings should be checked to determine the specific cause of the problem and take corresponding maintenance measures.

Summary. If the one-phase current is significantly greater than the other two-phase current in the three-phase motor, it is likely to be caused by the following problems: 1

The three-phase power supply is unbalanced. The difference in the three-phase voltage will directly lead to the three-phase current imbalance. It is necessary to check the power supply and distribution system, and adjust the three-phase voltage to be close to equal.

2.Motor winding failure. If one phase in a three-phase winding is faulty, the current in that phase will increase.

It is necessary to check whether the motor windings are in good condition.

Hello Dear I am the little assistant Anqi, and I am happy to answer the question for you, "What is the problem of a three-phase motor with a large phase current".

If the one-phase current is significantly greater than the other two-phase current in the three-phase motor, it is likely to be caused by the following problems: 1The three-phase power supply is unbalanced.

The difference in the three-phase voltage will directly lead to the three-phase current imbalance. It is necessary to check the power supply and distribution system, and adjust the three-phase voltage to make it nearly equal. 2.

Motor winding failure mountain knowledge balance. If it is a phase fault in the three-phase winding overmatch, the current of this phase will increase. It is necessary to check whether the motor windings are in good condition.

3.Rotor failure. The motor sells cracks, and the rotor jam or broken strip may also lead to an increase in the one-phase current.

It needs to be turned to check whether the rotor is stuck. 4.Poor contact.

Poor internal contact of the motor, such as insufficient brush spring pressure, will increase the source of the current distribution in one phase. Internal contact needs to be checked.

5.The phase order is wrong, and the wisdom is wrong. Reversing the motor will also cause the current to be unbalanced.

It should be wired correctly to ensure that the motor rotates forward. 6.The motor load is unbalanced.

Current imbalances can also occur due to changes in current in different phases. The load balance of the machine in front of the machine should be ensured.

It is necessary to carry out detection and analysis in all aspects to find out the specific cause of the current imbalance, and then carry out targeted repairs and adjustments to repair the normal working condition of the three-phase seepage motor. Spring tremors.

Summary. The large one-phase current of a three-phase motor may be caused by the insulation damage of the motor or the decrease in insulation resistance, or it may be caused by a short circuit or poor contact in the windings of the motor. In addition, incorrect wiring of the motor can also lead to excessive one-phase current.

First of all, the insulation condition of the motor should be checked, and if the insulation is found to be damaged, the insulation material should be replaced in time to prevent the insulation resistance of the motor from becoming smaller, resulting in excessive one-phase current. Secondly, the winding of the motor should be checked for short circuit or poor contact, and if it is found that there is a short circuit or poor contact, it should be repaired in time to prevent excessive one-phase current. Finally, the wiring of the motor should be checked to see if it is correct, and if the wiring error is found, it should be corrected in time to prevent the one-phase current from being too large.

In short, the one-phase current of the three-phase motor is likely to be caused by the insulation damage of the motor, short circuit or poor contact of the winding, wrong wiring, etc., which should be checked and repaired in time to prevent the one-phase current from being too large.

The large one-phase current of the three-phase motor may be caused by the insulation damage of the motor or the reduction of the insulation resistance, or it may be caused by the winding short-circuit or poor contact of the motor. In addition, incorrect wiring of the motor can also lead to excessive one-phase current. First of all, the insulation condition of the motor should be checked, and if the insulation is found to be damaged, the insulation material should be replaced in time to prevent the insulation resistance of the motor from becoming smaller, resulting in excessive one-phase current.

Secondly, the winding of the motor should be checked for short circuit or poor contact, and if it is found that there is a short circuit or poor contact, it should be repaired in time to prevent excessive one-phase current. Finally, the wiring of the motor should be checked to see if it is correct, and if the wiring error is found, it should be corrected in time to prevent the one-phase current from being too large. In short, the one-phase current of the three-phase motor may be caused by the insulation damage of the motor, the short circuit of the winding, the poor contact, the wrong wiring, etc., which should be checked and repaired in time to prevent the one-phase current from being too large.

I'm sorry I don't understand, but can you elaborate on that?

The large one-phase current of the three-phase motor is caused by the improper connection of the winding of the motor or the damage of the winding of the motor. Reasons:1

Improper winding wiring of the motor: Improper wiring of the winding of the motor will lead to excessive one-phase current of the motor, which will affect the power of the motor, thereby affecting the normal operation of the motor. 2.

Damage to the windings of the motor: The winding damage of the motor will cause the one-phase current of the motor to be too large, which will affect the power of the motor, which will affect the normal operation of the motor. Workaround:

1.Check the winding wiring of the motor: Check whether the winding wiring of the motor is correct, if not, it should be modified in time to ensure the normal operation of the motor.

2.Replace the winding of the motor: If the winding of the bending motor is damaged, the new winding should be replaced in time to ensure the normal operation of the motor.

Personal Tips:1When installing the motor, attention should be paid to check whether the winding wiring of the motor is correct to ensure the normal operation of the motor.

The one-phase current of the three-phase motor refers to the current of one of the three phases of the three-phase motor, which is an important indicator of the operating state of the three-phase motor and can reflect the power and efficiency of the motor.

Hello pro-Qiaoqiao, I am happy to answer for you If the one-phase current in the three-phase motor is large, there may be the following problems:1The power supply voltage is not positive letter balanced:

Three-phase motors require a stable power supply, and if the voltage in the three-phase power supply is unbalanced, i.e., the voltage of one phase is higher or lower, it will lead to a larger current in one phase. 2.Phase-to-phase short circuit:

The three phases of the three-phase motor should be independent of each other, if there is a short circuit between two of the phases, it will cause the current to be concentrated at the short circuit, resulting in a large phase current. 3.Poor interphase insulation:

There should be good insulation between each phase of the three-phase motor, if there is poor insulation, it may cause the current to be concentrated at the short circuit between the phases, resulting in a large one-phase current. 4.Internal failure of the motor:

The internal components of the motor, such as windings or insulation, can be faulty, such as a short circuit in the windings of a certain phase or a damaged insulation, resulting in a large current in one phase.

Summary. Is it okay to add a large amount of current to a three-phase motor? This question needs to be more specific to give an answer.

Here are two possible scenarios:1This is not true if it is required that the three-phase motor current can be added together plus the single-phase current.

Because the operation of the three-phase motor needs to be powered by the three-phase power supply, the voltage and current of the three-phase power supply are expected to be balanced, and the change between the currents of each phase should not be too large, otherwise it may cause the motor to fail to work normally or even be damaged. Therefore, the current of a three-phase motor should not be directly added to the single-phase current. 2.

In the case of summing the currents of three three-phase motors, the total current can be calculated by adding the vectors. Since the difference in the angle between the three-phase currents is 120 degrees, it is necessary to decompose the three three-phase currents separately, and then add their components to obtain the sum of the three three-phase currents. However, this situation needs to consider the rated capacity, load, line safety and other factors of the equipment, otherwise it may lead to overload or even danger of electrical equipment.

In short, the problem of increasing the current of a three-phase motor by one requires a case-by-case analysis. If you have specific needs or questions, it is recommended that you consult a professional electrical engineer or technical staff of the power company.

Fellow, I really didn't understand, I can be more specific.

Is it okay to add a large amount of current to a three-phase motor? This question needs to be more specific to give an answer. Here are two possible conditions of pure source of affection:

1.This is not true if it is required that the three-phase motor current can be added together plus the single-phase current. Because the operation of the three-phase motor needs to be powered by the three-phase power supply, the voltage and current of the three-phase power supply are expected to be balanced, and the change between the currents of each phase should not be too large, otherwise it may cause the motor to fail to work normally or even be damaged.

Therefore, the current of a three-phase motor should not be directly added to the single-phase current. 2.In the case of summing the currents of three three-phase motors, the total current can be calculated by adding the vectors.

Since the difference in the angle between the three-phase currents is 120 degrees, it is necessary to decompose the three three-phase currents separately, and then add their components to obtain the sum of the three three-phase currents. However, this situation needs to consider the rated capacity, load, line safety and other factors of the equipment, otherwise it may lead to overload or even danger of electrical equipment. In short, the problem of increasing the current of a three-phase motor by one requires a case-by-case analysis.

If you have specific volt needs or concerns, it is recommended that you consult a professional electrical engineer or technical staff at the power company.