Just casually talk about several development trends of industrial drive motors, welcome to correct me!

The most widely used is the cage-type asynchronous motor, and its technological progress highlights the application of thin-gauge silicon steel sheets. Low-voltage direct grid-connected operation motors gradually promote and optimize IE5 energy-efficient products, and high-voltage motors further reduce iron consumption, improve ventilation and cooling, and increase power density. Like replacing heat with cold, the mass adoption of thin-gauge silicon steel sheets will reduce their prices and replace the original 0.5mm silicon steel sheets with higher losses.

The most exciting thing is the rapid development of variable speed motors. The combination of permanent magnet motor and synchronous reluctance design technology and new materials makes the more economical grade 1 and super IE5 variable speed motors a reality. The thin specification and low-loss silicon steel sheet greatly reduces the iron consumption, and the multi-pole high-frequency design reduces the cost of the motor body. The ferrite-assisted reluctance permanent magnet motor further reduces the cost of the motor and breaks away from the price control of rare earths. A large number of industrial drive motors do not pursue small size and light weight, but high efficiency. Therefore, ferrite-assisted reluctance permanent magnet motors will be widely used, and it is likely to exceed the output of rare earth permanent magnet motors. The mass application of ferrite-assisted reluctance permanent magnet motors must first have corresponding drive frequency converters to achieve efficient and reliable control of such motors. This is not a complicated scientific and engineering problem, and it can be solved only by investing in some research and development by inverter manufacturers. The ferrite reluctance permanent magnet motor can not only reach IE5 in the general speed and power range, but also can further exceed IE5, meet the requirements of GB 30253 level 1, and reduce the loss by more than 20% on the basis of IE5.

Rare earth permanent magnet synchronous motors will also be used in occasions that require high power density, small installation space, and small equipment volume requirements, such as high-performance servo motors, low-speed direct drive motors, electric drive motors for vehicles, aviation electric drive motors, ship electric drives, etc. Applications such as drive motors. Similarly, the rare earth permanent magnet synchronous motor can not only reach IE5 in the general speed and power range, but also can further exceed IE5, meet the requirements of GB 30253 level 1, and reduce the loss by more than 20% on the basis of IE5.

The improvement in energy efficiency mentioned above will inevitably increase the cost. But with the added cost of the motor body, heavy-duty equipment can exceed the financial break-even point of replacing inefficient motors in a relatively short period of time. It can be seen that it was first applied to some compressors and water pumps that require variable speed drives.

Ferrite reluctance permanent magnet motors will drive the development of ferrite materials and increase the amount of metal cobalt, which is used to improve the performance of ferrite.

Another important development trend is the development of low-speed direct drive motors to higher power and lower speed. The low-speed direct drive motor replaces the gear, or reduces the reduction ratio to form a full direct drive and semi direct drive drive system, making the entire drive equipment more economical and more reliable. The low-speed direct drive motor can output a torque of up to 100,000 Nm to 500,000 Nm to drive large wire drawing machines, belt conveyors, mixers, elevators, ball mills, fracturing The development of this type of motor requires relatively economical high remanence rare earth permanent magnet materials.

There are other developments such as cooling technology, forming winding technology, and high-speed bearing technology, which can further increase the power density of the motor.

Before there is a breakthrough in technologies such as superconducting materials, the development of motor body efficiency and power density will tend to be saturated, and the greater development lies in the intelligent optimal control of the motor by the drive system.

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Post time: Apr-23-2023