A “black technology” motor that is more energy-efficient than rare earth permanent magnet motors? The “stand out” synchronous reluctance motor!

    Rare earth is known as “industrial gold”, and it can be combined with other materials to form a variety of new materials with different properties, which can greatly improve the quality and performance of other products.

       As the proportion of China’s rare earth reserves in the world’s total reserves declines, rare earth has become a national strategic reserve resource; rare earth mining and deep processing will bring environmental damage problems…

When this “national-level” topic was put in front of the society, most enterprises were still “on the sidelines”, while Gree chose to use “black technology” to take on the “important task”.

In 1822, Faraday proved that electricity can be converted into rotational motion;

Under the continuous practice of this theory, the first DC generator and motor in human history came out;

Siemens used it to drive vehicles, and then created the world’s tram;

Edison also experimented with this motor, which greatly unleashed the horsepower of the trolley…

Today, motors have become one of the indispensable components of mechanical equipment. However, traditional motor manufacturing is “inseparable from rare earths”. In the motor manufacturing industry, energy saving and emission reduction are urgent.

       ”With the changes in the environment, we began to realize that the responsibility of the enterprise is not only to master the core technology, but also to combine the products, the environment, and the needs of human survival. The products produced in this way are truly valuable.” ——Dong Mingzhu

Therefore, Gree Kaibon synchronous reluctance motor, which does not need to use permanent magnets, does not rely on rare earth elements, saves manufacturing costs, avoids environmental pollution caused by the development of rare earth deposits, and fundamentally responds to the national call for energy conservation and emission reduction, came into being.

The synchronous reluctance motor has the property of reluctance. It follows the operating principle that the magnetic flux always closes along the path of minimum reluctance. The torque is formed by the magnetic pull generated by the change of reluctance caused by the rotor at different positions. With high performance and low cost , The advantages of energy saving stand out in many motor categories.

Synchronous reluctance motor VS traditional DC motor: no brushes and rings, simple and reliable, easy maintenance;

Synchronous reluctance motor VS traditional AC asynchronous motor: There is no winding on the rotor, so there is no rotor copper loss, which improves the efficiency of the motor;

       Synchronous reluctance motor VS switched reluctance motor: The rotor surface is smooth and the reluctance change is relatively continuous, which avoids the problems of torque ripple and large noise during the operation of the switched reluctance motor; at the same time, the stator is a sine wave magnetic field, which is simple to control and a hardware platform Mature, thereby reducing the cost of the drive control system;

       Synchronous reluctance motor VS industrial darling – permanent magnet synchronous motor: there is no permanent magnet on the rotor, the cost is lower, it solves the problem of no field weakening and loss of magnetism, long-term use, the efficiency is more stable, and there are no strict requirements on volume and weight The occasion can completely replace the permanent magnet synchronous motor.

Through independent research and development, Gree took the lead in mastering the core technology of synchronous reluctance motors in China, and adopted special materials, multiple optimized motor control strategies and manufacturing processes such as iron core manufacturing and motor assembly, and finally tapped more possibilities.

1. Energy saving and environmental protection

       The synchronous reluctance motor cancels the permanent magnet, there is no problem of high temperature loss of magnetism, and it can operate stably under extreme high temperature. Since it does not need to use permanent magnets, it does not rely on rare earth elements, saves manufacturing costs, and avoids the pollution of rare earth deposits to the environment. Fundamentally respond to the national call for energy conservation and emission reduction. In addition, the rotor of the synchronous reluctance motor does not need to be cast aluminum, which greatly reduces the energy consumption in the manufacturing process.

2. Efficient operation

Compared with asynchronous motors, synchronous reluctance motors are more efficient, and can reach energy efficiency above IE4. The load range from 25% to 120% belongs to the high-efficiency area. Replacing asynchronous motors or YVF motors with the same power can greatly improve system energy efficiency and comprehensively save electricity. The effect is as high as 30% or more.

3. Quick response

       Since there are no squirrel cage bars and magnets on the rotor, and the large-area magnetic barrier slot in the rotor punching piece, the rotor of the synchronous reluctance motor has a small moment of inertia. Under the same specifications, the moment of inertia of the synchronous reluctance motor is only about 30% of that of the asynchronous motor. For occasions that require high acceleration response capabilities, such as extruders, it can significantly reduce the overload multiple requirements of the motor, reduce the current module specifications of the inverter, and save energy. User costs while speeding up production.

4. Good versatility

       The synchronous reluctance motor uses the IEC standard casing (cast aluminum or cast iron casing can be used according to user requirements), and the installation dimensions refer to the IEC standard frame. For the high power density synchronous reluctance motor, since the frame size is 1-2 smaller than the standard three-phase asynchronous motor, the volume is reduced by more than 1/3, which can be easily customized according to customer needs (various installation methods, External device interface design), directly replace the original motor.

5. Low temperature rise

       Since the synchronous reluctance motor still maintains a small rotor loss when running at rated power, the temperature rise margin is large. It can maintain constant torque operation within the range of 10%-100% rated speed, and can allow 1.2 times overload operation, which is also applicable in self-fan cooling structure.

6. High reliability and easy maintenance

The rotor has no risk of demagnetization, low loss, and low bearing temperature, ensuring long-term stability of the bearing lubrication system and increasing the life of the insulation system; at the same time, the rotor is light in weight, easy to disassemble and assemble, and safer to maintain. Easily cope with harsh environments and extreme operating temperatures.

In addition, in applications such as pumps and fans that require partial rated load operation, synchronous reluctance motors are extremely in line with users’ needs for energy conservation and emission reduction.

At present, Kaibang has applied for more than 20 patents on synchronous reluctance motor body and control technology, and has realized a large number of products, with technical indicators surpassing international competing products.

Inverter fan

Inverter water pump

air compressor

Shielding pump

Some experts once put forward: “There is no rare earth safety problem in my country. Should it be consistent with the international market and adopt the ‘removing rare earth technology’ route by applying synchronous reluctance motors? Or make full use of the advantages of rare earths to improve the cost performance of products?”

       Gree gives the answer – “make the sky bluer and the earth greener”, and continuously cultivates and pursues excellence in synchronous reluctance motor technology, because energy saving and emission reduction is not only a national issue, it is more about every life on earth. a life. This is the responsibility of a big country and also the responsibility of an enterprise.