Permanent magnet synchronous motors have the following advantages over AC asynchronous motors: 1. High efficiency, which can be explained from the following aspects: 1. Since the magnetic field of the permanent magnet synchronous motor is generated by permanent magnets, the excitation loss caused by the magnetic field generated by the excitation current is avoided. 2. Compared with the asynchronous motor, the external characteristic efficiency curve of the permanent magnet synchronous motor has a much higher efficiency value at light load. This is the biggest advantage of the permanent magnet synchronous motor compared to the asynchronous motor in terms of energy saving. Because usually when a motor drives a load, it rarely runs at full power. This is because: on the one hand, when selecting a motor, users generally determine the motor power based on the extreme working conditions of the load, and the chance of extreme working conditions occurring is Very rarely, at the same time, in order to prevent the motor from burning out during asynchronous operation, the user will also leave a margin for the power of the motor; on the other hand, when designing the motor, in order to ensure the reliability of the motor, the designer usually sets the power required by the user. On this basis, a certain power margin is further left, which results in more than 90% of the actual operating motors operating at less than 70% of the rated power, especially when driving fans or pumps. This results in the motor usually operating in the light load area. For induction motors, their efficiency is very low at light loads, while permanent magnet synchronous motors can still maintain high efficiency at light loads. 3. Since the permanent magnet synchronous motor has a higher power factor, its current is smaller than that of an asynchronous motor. Correspondingly, the stator copper loss of the motor is smaller and the efficiency is higher. 4. The system efficiency is high. The parameters of the permanent magnet motor, especially the power factor, are not affected by the number of poles of the motor. Therefore, it is easy to design a multi-pole motor. In this way, the load motor that traditionally needs to be driven through a reduction gearbox can be made using permanent magnet synchronous motors. The motor-driven direct drive system eliminates the need for a reduction gearbox and improves transmission efficiency. 2. High power factor: Since the power factor of the permanent magnet synchronous motor can be adjusted during design, it can even be designed to be 1, and it has nothing to do with the number of poles of the motor. However, due to the characteristics of its own excitation, the asynchronous motor will increase as the number of poles increases. This will inevitably lead to lower and lower power factors. For example, in an 8-pole motor, the power factor is usually around 0.85. A high motor power factor has the following benefits: 1. The power factor is high, the motor current is small, the motor stator copper loss is reduced, and it is more energy-saving. 2. The power factor is high, and the power supply capacity of the motor can be lower. At the same time, other auxiliary facilities such as switches and cables can be smaller, and the corresponding cost is lower. 3. The power factor of the permanent magnet synchronous motor is not affected by the number of poles of the motor. If the motor supporting system allows, the number of poles of the motor can be designed to be higher, the corresponding motor volume will be smaller, and the direct material cost of the motor will be lower. 3. Simple and flexible structure: Since the parameters of the permanent magnet synchronous motor are not affected by the number of motor poles, it is easy for the motor to directly drive the load, eliminating the need for a noisy and high failure rate gearbox.  

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