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What is more, it provides many advantages compared with others: permanent magnet synchronous motors; thus, in the trend of saving energy and protection from globally demanded pollution, as efficient and environment-friendly motor technologies, they have become beautiful, widely applied devices in modern times. A permanent magnet also gives outstanding expectations to many areas of interest for its specific principles of work and unique features.
Working Principle of Permanent Magnet Synchronous Motor
The permanent magnet synchronous motors make use of the power of the permanent magnets to keep the magnetic field invariable. Therefore, this intersects with another magnetic field provided by the stator current, thereby giving rise to torque which will cause the rotation of the motor. Unlike the induction motors of tradition, these synchronous motors do not need any extra excitation currents and hence reduce the losses in energy conversion while increasing the efficiency of the motor.
Advantages of permanent magnet synchronous motors
High efficiency:
High energy conversion efficiency: Since there is no extra excitation current, copper and iron losses of the permanent magnet synchronous motor are reduced. Thus, the efficiency of energy conversion in such a motor can be as high as 95% or even higher. In other words, at the same input energy consumption, the permanent magnet synchronous motor can do more effective work compared to different types of motors, increasing the overall efficiency of the equipment.
High operational efficiency: Compared to other types of motors, a permanent magnet synchronous motor rotor does not include collector rings and brushes, resulting in reduced mechanical friction together with associated losses. Meanwhile, its unique magnetic field structure provides the possibility to run with high efficiency even at low speeds. It is just this fact that makes the permanent magnet synchronous motor develop a greater advantage under working conditions in cases of frequent startups, stops, or alterations in speed.
High power density:
The maximum value of power density: In a permanent magnet synchronous motor, high-performance permanent magnetic materials are used, whereby larger magnetic fields can be generated with smaller volumes to improve the torque density. In other words, greater output torque can be obtained at the same volume, while the same power means better performance for the equipment with permanent magnet synchronous motors in use.
Small in size and light in weight: Permanent magnet synchronous motors use high power density to make their size smaller and weight lighter with the same power. This can reduce the size and weight of the equipment, make the equipment more portable, and flexible, and also greatly reduce the manufacturing cost and maintenance costs of the equipment.
Good speed regulation performance:
With large ranges of speed regulation, by changing the frequency and phase of the stator current, it will be capable of providing precise control of the motor speed. Large ranges of speed will be able to satisfy more application scenarios for the motor speed.
High-precision speed governing: PM synchronous motors use advanced control algorithms and systems that can realize high precisions of speed regulation. Therefore, the motor works well in application scenarios with precise speed control in aspects such as electric automobiles, wind power generation, and so on.
Energy saving and environmental protection:
The permanent magnet synchronous motor would have low noise because of the simple, solid structure and the enclosed construction, which reduces machine friction and vibration. With this, it greatly diminishes the noise a motor would produce during an operational process, thus promoting a much better working environment in comfort.
Energy-saving: Permanent magnet synchronous motors have high efficiency and high power density; therefore, they require low energy while running. Thus, this can save energy and reduce carbon emissions, which further reduces operating costs. The factor of green environmental protection also arises in this respect.
Low maintenance cost:
The structure is simple and solid; this again makes permanent magnet synchronous motors more maintainable because it is easier and less expensive, while the completely closed structure reduces interference with and damage from the external environment.
Maintenance-free: it adopts high-performance permanent magnet materials and advanced manufacturing technology to make the permanent magnet synchronous motor have less maintenance and replacement in operation, further reducing the cost of late use and maintenance and prolonging the service life of the equipment.
Wide range of applications:
Multi-field application: The Permanent Magnet Synchronous Motors can be applied to very wide fields and industries, like industry, transportation, energy, and so on. No matter whether high precision in control or high efficiency and high power density are required by the application scenario, permanent magnet synchronous motors can bring unique advantages into play.
High adaptability: The usage scenarios and working environments the PM synchronous motor could adapt to are so different with high temperature, low temperature, humidity, etc. It means permanent magnet synchronous motors have higher flexibility and adaptability under practical applications.
Applications of permanent magnet synchronous motor
Electric Vehicle: With the advantages of high efficiency and high power density, a permanent magnet synchronous motor will have wide applications in an electric vehicle. It provides powerful power support for the electric vehicle and can implement accurate speed control at the same time, promoting further development in driving performance and range.
Wind power generation: It includes running wind turbines within bad conditions; motors must possess high reliability and stability. Permanent Magnet Synchronous Motors are also widely utilized in wind power generation owing to their simple structure, robustness, and low maintenance cost. It keeps stability in power generation efficiency to changeable wind conditions, thus improving economic and environmental benefits in wind power generation.
Industrial machinery and equipment t: Permanent magnet synchronous motors are widely used in industrial machinery and equipment due to their high-precision and high-stability speed regulation performance. It can provide precise power control for machine tools, printing presses, textile machinery, and other equipment, thereby improving the productivity and product quality of the equipment.
Conclusion
Their advantages have made the permanent magnet synchronous motors spread in many fields all over the world. There is a better prospect application chance, depending on the continuous progress and technology application request when more development is achieved in motor drive technology.
