No rare earth motors, the real "black technology"!

2019-05-11 16:54:46

Rare earth is known as "industrial gold". It can be used as a new type of material with different compositions and properties, and can greatly improve the quality and performance of other products.

With the decrease of the proportion of rare earth reserves in China to the world total reserves, rare earth has become the national strategic reserve resources. Rare earth in the process of mining and deep processing will bring about environmental damage.

When this "national" topic is put in front of the society, most enterprises are still "on the sidelines", and Gree chose to use "black technology" to shoulder the "heavy responsibility".

A Spark of Fire to Open the Electrical Age

In 1822, Faraday proved that electricity can be transformed into rotational motion.

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

Siemens used it to drive cars and then build world trams.

Edison also experimented on the motor, which greatly released the horsepower of the tram...

Nowadays, motor has become one of the indispensable components of mechanical equipment. However, the traditional motor manufacturing "can not do without rare earth". In the motor manufacturing industry, energy saving and emission reduction is urgent.

With the change of environment, we begin to realize that the responsibility of enterprises is not only to master the core technology, but also to integrate products, environment and human survival needs, so that the products are truly valuable. —— Dong Mingzhu

Therefore, the Glickbang synchronous reluctance motor, which does not need permanent magnets, does not rely on rare earth elements, saves manufacturing costs, avoids environmental pollution caused by rare earth mineral exploitation, and fundamentally responds to the call of national energy conservation and emission reduction, emerges as the times require.

"Outstanding" Synchronous Reluctance Motor

Synchronous reluctance motor has the characteristics of reluctance. It follows the principle that flux always closes along the minimum path of reluctance. Torque is formed by the magnetic pull force caused by the change of reluctance at different positions of the rotor. With the advantages of high performance, low cost and energy saving, synchronous reluctance motor stands out among many kinds of motors.

Synchronous reluctance motor VS traditional DC motor: no brush and ring, simple and reliable, easy to maintain;

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

VS switched reluctance motor of synchronous reluctance motor: the smooth surface of rotor and the continuous change of reluctance avoid the problem of large torque ripple and noise when switched reluctance motor is running; at the same time, the stator is sinusoidal magnetic field, which has simple control and mature hardware platform, thus reducing the cost of driving control system;

VS industrial beloved of synchronous reluctance motor - permanent magnet synchronous motor: no permanent magnet on the rotor, lower cost, solve the problem of no weak magnetic field and loss of excitation, long-term use, more stable efficiency, in the case of no strict requirements for volume and weight can completely replace permanent magnet synchronous motor.

Take Social Responsibility with "Black Science and Technology"

Through independent research and development, Gree took the lead in mastering the core technology of synchronous reluctance motor in China, and used special materials, multiple optimization of motor control strategy, core manufacturing, motor assembly and other manufacturing processes, finally excavated more possibilities.

1. Energy saving and environmental protection

Synchronous reluctance motor cancels permanent magnet and has no high temperature loss of excitation. It can operate steadily at high temperature. Because it does not need to use permanent magnet, it does not rely on rare earth elements, saves manufacturing costs, avoids environmental pollution caused by rare earth mineral exploitation, and fundamentally responds to the call of national energy saving and emission reduction. In addition, the synchronous reluctance motor rotor does not need to cast aluminium, which greatly reduces the energy consumption in the manufacturing process.

2. Efficient operation

Compared with asynchronous motor, synchronous reluctance motor is more efficient and can achieve energy efficiency above IE4. It belongs to high efficiency area from 25% to 120% of the load range. Replacing asynchronous motor or YVF motor with the same power can greatly improve the energy efficiency of the system, and the comprehensive power saving effect is as high as 30%.

3. Rapid response

Because there are no squirrel cage guide bars and magnets on the rotor, and the large area of magnetic barrier slots in the rotor punch, the rotor of synchronous reluctance motor has a smaller moment of inertia. Under the same specifications, the rotational inertia of synchronous reluctance motor is only about 30% of that of asynchronous motor. For the occasions with high requirements for acceleration response, such as extruder, the overload multiple requirement of motor can be significantly reduced, the specifications of current module of frequency converter can be reduced, the cost of users can be saved, and the production efficiency can be accelerated.

4. Good versatility

Synchronous reluctance motor uses IEC standard housing (casting aluminum or cast iron casing can be used according to user's needs), and the installation size refers to IEC standard housing. For high power density synchronous reluctance motors, the seat number is 1-2 smaller than that of standard three-phase asynchronous motors, and the volume is reduced by more than 1/3. It is easy to directly replace the original motor according to customized requirements (multiple installation methods, external equipment interface design).

5. low temperature rise

Because the synchronous reluctance motor still maintains a small rotor loss while operating at rated power, the margin of temperature rise is large. Constant torque operation can be maintained in the range of 10%-100% rated speed, 1.2 times overload operation can be allowed, and it is also applicable in self-fan cooling structure.

6. High reliability and easy maintenance

The rotor has no demagnetization risk, low loss and low bearing temperature, which ensures the long-term stability of the bearing replacement system and increases the life of the insulation system. At the same time, the rotor is light in weight, easy to disassemble and assemble, safer in maintenance, and no special protective treatment is needed after disassembly. It can easily cope with harsh environment and extreme working temperature.

In addition, in the application fields of pumps, fans and other applications requiring partial rated load operation, synchronous reluctance motors are extremely in line with users'requirements for energy saving and emission reduction.

At present, Kaibang has applied for more than 20 patents on synchronous reluctance motor body, control technology and other patents, and has achieved a large number of products, technical indicators beyond international competition.

Some experts have put forward that "there is no problem of rare earth safety in China. Should we use synchronous reluctance motor to go"de-rare earth technology"in line with international standards? Or make full use of the advantages of rare earth to improve the performance-price ratio of products?

Gree gave the answer - "Make the sky bluer, the earth greener." Kai Bong in the synchronous reluctance motor technology continues to cultivate, the pursuit of excellence, because energy conservation and emission reduction is not only a national problem, it is more related to every life on the planet. This is the responsibility of a big country, but also of an enterprise.