What should I do if the gap between the stator and the rotor of the three phase motor is large?

Friend, the gap between the stator and the rotor of the motor has been finalized in the production process of the motor, unless the gap becomes larger due to various reasons of the rotor sweeping during use, but it is generally impossible. The motor current is large, and there are many reasons - reason 1: the deviation of the positioning magnet, the treatment method:

Rebonding Reason 2: The gap between the carbon brushes is uneven, and the treatment method: Correct the gap between the carbon brushes Reason 3:

There is a short circuit between the positive and negative poles of the battery, treatment method: eliminate short circuit Reason 4: short circuit between turns, treatment method:

Re-changeover Reason 5: The commutator piece is short-circuited, and the treatment method: clean and polish the commutator piece Reason 6:

The fit between the shaft and the bearing is too tight, treatment method: grinding shaft Reason 7: electric vehicle zero start, treatment method:

Try to avoid Reason 8: large load or large driving resistance of the vehicle, treatment method: human assistance.

Reason 1: Positioning the deviation of the magnet, treatment: re-bonding.

Reason 2: The gap between the carbon brushes is uneven, and the treatment method: correct the gap between the carbon brushes.

Reason 3: There is a short circuit between the positive and negative poles of the battery, and the solution: exclude the short circuit.

Cause 4: Short circuit between turns, solution: re-change the line.

Reason 5: The commutator piece is short-circuited, and the treatment method is to clean and polish the commutator piece.

Reason 6: The fit between the shaft and the bearing is too tight, and the treatment method: grinding the shaft.

Three-phase motor san ABCDian refers to when the three-phase stator winding of the motor (each difference of 120 degrees of electric angle), after the three-phase alternating current is introduced, a rotating magnetic field will be generated, which will cut the rotor winding, thereby generating induced current in the rotor winding**The sub-winding is a closed path), the current-carrying rotor conductor will generate electromagnetic force under the action of the stator rotating magnetic field, thereby forming an electromagnetic torque on the motor shaft and driving the motor to rotate, And the direction of rotation of the motor is the same as the direction of the rotating magnetic field.

If the gap is too large, the magnetoresistance will increase, the excitation loss will increase, the excitation current will increase, and the power factor of the motor will also decrease, so that the performance of the motor will deteriorate.

Generally, the air gap of small asynchronous motors is about between, and the air gaps of medium-sized asynchronous motors are about between.

The air gap is to ensure that the rotor can rotate freely in the stator cavity, and the size of the air gap has a great impact on the performance and operation reliability of the asynchronous motor. In order to reduce the excitation current and power factor, the air gap should be minimized. However, if the air gap is too small, it will go to the opposite side, which will increase the harmonic field of the air gap, increase the stray loss and noise of the motor, and reduce the maximum torque and starting torque.

At the same time, the air gap is too small, and it is easy to make the rotor of the running towel rub against the stator, and the phenomenon of "sweeping" occurs, which brings difficulties to starting, thereby reducing the reliability of operation. In addition, it also caused difficulties in assembly.

In general, the size of the gap between the rotor and stator of the motor should be optimal. If the gap is too small, friction and heat problems may occur when working;If the gap is too large, it may lead to problems such as decreased motor efficiency and increased energy loss. The gap between the rotor and stator of a motor is very important for several reasons:

1.Avoid mechanical friction: When the motor is working, due to the movement between the rotor and stator, friction may cause problems such as energy loss, noise, mechanical wear, etc.

Proper clearance can reduce mechanical friction and protect the motor. 2.Guaranteed air circulation:

In the process of high-speed rotation, due to the action of centrifugal force, there is a strong air flow inside the motor, and the appropriate gap can be wide to ensure that the air flow is free to pass between the rotor and the stator, so as to effectively cool the motor and prolong the service life. 3.Avoid thermal expansion:

When the motor is working, due to the increase of heat, the thermal expansion of metal parts will occur, and the existence of clearance can effectively alleviate the problems that the motor may encounter in the process of thermal expansion and cold contraction. In general, the appropriate clearance size can ensure the stable operation of the motor, work efficiently and prolong the service life of the motor.

When installing single-phase motors, stators and rotors, the best clearance is the outer circle of the rotor, and what are the disadvantages of too large or too little clearance.

Hello, the gap of the general small asynchronous motor is about between, and the medium-sized asynchronous motor is about 075 between 2mm. The gap between the stator and the rotor of the motor has been finalized in the production process of the motor, unless the gap becomes larger due to various reasons of the rotor sweeping during use.

The size of the gap has a great influence on the performance and operation reliability of the asynchronous electric delay machine. The gap is too large - the reluctance will increase greatly, so that the excitation loss will increase, the excitation current will also increase, and the power factor of the motor will also decrease, so that the performance of the motor will deteriorate. In order to reduce the excitation current and improve the power factor, the gap should be reduced as much as possible.

However, if the gap is too small, the harmonic magnetic field of the air gap will increase, and the stray loss and noise of the motor will increase, so that the maximum switching moment and starting torque will be reduced.

Dear , I'm glad to answer for you. The size of the gap between the motor rotor and the stator The gap between the motor rotor and the stator should be in between, and this range is more appropriate. If the gap is too small, it is easy to cause excessive heat of the motor, and at the same time, it will cause the contact between the rotor and the stator, thereby damaging the motor; If the gap is too large, it will cause the motor to shake too much when it rotates, which will affect the normal operation of the motor.

Therefore, in practical applications, the gap between the rotor and the stator should be determined according to the speed, power and load of the motor.

A certain length of air gap should be maintained between the outer surface of the rotor and the inner surface of the stator of the motor, so as to ensure that the rotor can rotate freely in the stator cavity. Although there is no direct electrical connection relationship between the rotor and the stator, when the stator winding is energized, there is an electromagnetic connection between the stator and rotor through the air gap, similar to the transformer principle, the stator magnetic field and the rotor magnetic field are coupled with each other, so as to realize the energy conversion function between electrical energy and mechanical energy.

The size of the air gap length has a great impact on the performance and operation reliability of the asynchronous motor. If the air gap is too large, the magnetic resistance will increase greatly, and the excitation current required to achieve the same magnetic field strength will increase significantly, and the excitation loss will also increase significantly, and the power factor of the motor will decrease significantly, so that the performance of the electric machine will deteriorate. In order to reduce the excitation current and improve the power factor, the air gap should be reduced as much as possible.

However, if the air gap is too small, the harmonic magnetic field of the air gap will increase, the stray loss and noise of the motor will increase, and the maximum torque and starting torque will be reduced. On the other hand, the air gap is too small and it is easy to make the rotor and stator in operation rub against each other, and the cleaning failure occurs, and even the rotor is stuck and does not rotate, which reduces the reliability of operation and also brings difficulties to assembly. Generally, the air gap of small and medium-sized asynchronous motors is about between the empty bright, and the large and medium-sized asynchronous bucket width motors are about between.

In order to ensure that the rotor can rotate freely in the stator cavity, the size of the air gap section has a great impact on the performance and operation reliability of the asynchronous motor.