1. Low loss and low-temperature rise
Since the magnetic field of the permanent magnet synchronous motor is generated by the permanent magnet, the driving loss caused by the magnetic field generated by the driving current, that is, the copper loss is avoided; the rotor works without current, which significantly reduces the temperature rise of the motor and the temperature rise is less than 20K under the same load.
2. High power factor
A permanent magnet synchronous motor has a high power factor, independent of the number of poles of the motor. When the motor is fully loaded, the power factor of the motor is close to 1. Compared with the asynchronous motor, the motor current is lower, the copper loss of the motor stator is correspondingly lower, and the efficiency is higher. As the number of motor poles increases, the power factor of an asynchronous motor is getting lower and lower. In addition, due to the high power factor of the permanent magnet synchronous motor, the capacity of the power supply (transformer) matched with the motor can theoretically be reduced, and the specifications of the supporting switch cabinet and cables can be reduced at the same time.
3. High efficiency
Compared with asynchronous motors, permanent magnet synchronous motors have a much higher efficiency value at light load and have a wide range of high-efficiency operations. The efficiency is greater than 90% in the range of 25% to 120%. The rated efficiency of the permanent magnet synchronous motor can reach 1 time the current national standard energy efficiency level, which is its biggest advantage in energy saving compared with the asynchronous motor. In actual operation, the motor rarely runs at full power when driving a load. The reason is: On the one hand, when the designer selects the motor, the motor power is generally determined according to the extreme working conditions of the load, and the possibility of extreme working conditions is very small. At the same time, in order to avoid burns under abnormal working conditions To ensure reliability of the motor, the motor manufacturer will generally leave a certain power margin on the basis of the power required by the user to ensure the reliability of the motor. This leads to the actual operation of the motor, most of the work is below 70% of rated power, especially to drive fans or pump loads, the motor generally works in the light load area. For asynchronous motor, its light load efficiency is very low, while permanent magnet synchronous motor can still keep high efficiency in the light load area.
4. Other advantages
The permanent magnet synchronous motor also has the advantages of high starting torque, short starting time, and high overload capacity. It can reduce the installed capacity of the equipment drive motor according to the actual shaft power, save energy and reduce investment in fixed assets. The permanent magnet synchronous motor is easy to control, has a constant speed, does not change with load fluctuations or voltage fluctuations, only depends on frequency, and runs smoothly and reliably. Because the speed is strictly synchronized, the dynamic response performance is good, and it is suitable for frequency conversion control. The installation dimensions of the permanent magnet synchronous motor meet the IEC standard, which can directly replace the three-phase asynchronous motor, and the protection level can reach IP54 and IP55.
ENNENG is committed to research, development, and manufacturing of a variety of special high-low voltage low-speed direct drive large torque permanent magnet motors, constant speed permanent magnet motors, and special permanent magnet motors. By absorbing foreign advanced permanent magnet motor design and manufacturing process, and by cooperating with domestic top motor supply chain supporting enterprises, the company has developed dozens of types of special industry permanent magnet motors, covering the full range of high and low voltage permanent magnet motor products, with patent technology of independent intellectual property rights.