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Compared with the power frequency motor, the permanent magnet synchronous motor is easy to control, the speed is determined by the power frequency, the operation is stable and reliable, and it does not change with the fluctuation of the load and voltage. In view of the strict synchronization of the speed of the permanent magnet synchronous motor, determines the advantage of the motor’s good dynamic response performance, which is more suitable for variable frequency control.
A permanent magnet motor is a type of motor that uses permanent magnets to generate the motor’s magnetic field without the need for an excitation coil or an excitation current. Its magnetic field is provided by high-performance permanent magnet materials (e.g., rare-earth samarium-cobalt, neodymium-iron-boron, etc.), which have high magnetic moments and permeability and are capable of generating powerful magnetic fields. When current passes through the coils in the motor, according to Ampere’s law, the current generates a magnetic field, and this field interacts with the magnetic field of the permanent magnets to produce a torque, which turns the motor. But not all working conditions and occasions are required or suitable to use permanent magnet synchronous motor, which is very worthy of discussion.
Theoretically, the permanent magnet synchronous motor is more suitable for loads with frequent load changes, and the motor often runs in no-load or light-load state, such as lathes, punches, chemical fiber, textile, wire drawing equipment, and its final energy-saving effect is more obvious, the average power saving rate can reach more than 10%.
In many occasions, especially when the cage motor is selected, in order to make the equipment start smoothly, in most cases, the motor will be selected according to the maximum load of the equipment, which will inevitably lead to a relatively low load rate and a poor motor capacity during normal operation of the motor. In the case of serious excess, when the motor is running, the efficiency is related to the size of the load. Generally, when the motor is running without load, the efficiency is close to zero, and when the load increases, the efficiency also increases. Efficiency is highest when the load reaches 70% of the rated load; therefore, the motor is most efficient, energy efficient, and economical when it is operated close to the rated load. If the matching asynchronous motor is replaced with a high starting torque permanent magnet synchronous motor, the result of configuring the energy input on demand will play a great role in saving energy. The advantage of the permanent magnet synchronous motor lies in its two lows and two highs, namely low loss and temperature rise, high power factor, and high efficiency, which is also the pursuit of motor performance by people, which determines the market application status of permanent magnet motors.
The following is the application of permanent magnet motors in different area:
In the industrial sector, the high efficiency and energy-saving properties of permanent magnet motors enable them to meet the needs of industries with high energy efficiency requirements. Whether for CNC machine tools, plastics machines or compressors, PM motors can significantly reduce energy consumption in industrial production. In addition, PM motors play an important role in industrial automation and are widely used in robots, CNC tooling machines, packaging equipment and conveyor systems, where their high efficiency, responsiveness and precise control characteristics make them ideal for high-precision machining and production.
In the automotive industry, permanent magnet synchronous motors are widely used in electric and hybrid vehicles. High power density and high efficiency enable electric vehicles to have better range and energy saving. PM motors can not only improve the driving efficiency of the car, but also realize energy recovery to further improve the range of the car.
In addition, in the field of new energy, permanent magnet motors also play an irreplaceable role. Permanent magnet generators are widely used in wind power and hydroelectric power generation, etc., utilizing wind or water energy to be converted into electricity. At the same time, permanent magnet motors are also used in solar photovoltaic tracking systems, ocean energy generation and other new energy devices to promote the development of renewable energy.
Permanent magnet motors are widely and deeply used in various industries, and their characteristics of high efficiency, energy saving and reliability make them play an important role in various fields. With the continuous progress of science and technology and the continuous expansion of application fields, the application prospect of permanent magnet motors will be more broad.
Enneng is a China leading permanent magnet motor supplier. Enneng’s permanent magnet motors are widely used in China famous companies of different fields including gold mines, coal mines, tire factories, oil wells, and water treatment plants. Enneng’s machines have benefited customers for energy saving as well as for environmental protection. The three-phrase synchronous generators, studied out by Enneng, are widely applied in power systems of marine stations, offshore drilling platforms, land power stations, etc. Enneng can make perfect customization for different customers according to different demands. Whatever you need, our experienced engineers shall provide the effective solution as you required. Your demand is always what we pursue!
