Permanent magnet synchronous motor is also known as permanent magnet motor, rare earth permanent magnet synchronous motor, AC permanent magnet synchronous motor and so on. The environmental protection and energy-saving effect of permanent magnet motors are warmly welcomed by industrial large fan manufacturers and can be used in large and medium-sized fans.

Industrial large fans also have the advantages of small size, light weight, low noise, small loss, high efficiency, high power factor, high torque inertia force, high power density, and wide transmission range.

Naturally, the permanent magnet motor is also attrition, and the heating phenomenon will also occur, and the article will mainly introduce the wear and tear and heating causes of the permanent magnet motor.

The heat source for heating a permanent magnet motor comes from damage to the motor. Whether it is to reduce the heating of the motor or to complete the high efficiency of the characteristics of the permanent magnet synchronous motor, the way is to improve work efficiency.

High efficiency is due to reduced motor wear. What is the key loss of a permanent magnet motor?

First, the rare earth permanent magnet motor rotor winding resistance copper wear loss.

The copper loss of the motor stator winding resistance is composed of two parts: the damage measured by the resistance of the electromagnetic coil and the high frequency alternating electromagnetic field skin collection effect caused by the additional damage of the high frequency of the winding resistance. Wound resistance high frequency additional.

Finite element can be used to measure the loss related to the motor output power, the specification of the winding resistance conductor, the trough ranking part, and so on.

Second, rare earth permanent magnet motor rotor and rotor transformer core wear loss.

Damage to the rotor core of the motor refers to the damage caused by the eddy current effect of the rotor core of the motor. The iron consumption of the motor is concentrated on the stator side of the motor, accounting for about 95% of the total iron consumption.

The rotor iron consumption of the motor is mainly scroll iron consumption, and the key of wear and tear is concentrated in the permanent magnet material and the surface of the rotor. Although this part of the wear and tear is relatively small, but because of the motor rotor heat exhaust standard deviation, surface motor.

Motor rotor iron consumption processing errors are very easy to cause the motor rotor to heat up too much, resulting in demagnetization of permanent magnet materials.

Third, the industrial large fan permanent magnet motor motor rotor transformer core wear loss.

In the permanent magnet synchronous motor, the motor stator fundamental wave magnetic potential rotates with the motor rotor, so the motor rotor vortex damage is mainly affected by the motor stator slot magnetic density magnetic conductivity transformation and the motor stator around the resistive magnetic dynamic potential.

The analysis method is difficult to measure the harm of harmonic current between harmonic current and winding resistance current.

Fourth, permanent magnet motor wind friction damage and mechanical equipment.

Wind friction and mechanical equipment friction damage refers to the natural ventilation damage caused by the friction of rolling bearings, carbon brushes, fans and refrigeration substances during the rotation of the motor rotor. Wind friction damage is original.

Because the rotation is informed of the damage caused by gas friction, the higher the surface roughness of the surface layer of the motor rotor, the greater the damage, the higher the rate, and the greater the damage. The key to damage to machinery and equipment is related to the rate of high-speed motors.

Mechanical and equipment wear and tear accounts for a high proportion of total loss.

Fifth, the additional wear and tear of large industrial large fan permanent magnet motors.

The additional wear and tear of a permanent magnet synchronous motor, also known as stray loss, is composed of a fundamental frequency load spurious loss and a high frequency load spurious loss, the main components of which are the motor stator harmonic current and tooth harmonic magnetodynamic potential in the motor rotor.

High frequency damage caused by the motor rotor across the current flow and damage caused by the motor stator magnetomotive potential.