Several issues that users are more concerned about
3.1 Motor life
The CM500 series motors use rugged rotary transformers or absolute magnetic encoders as angle measuring devices to meet the high-precision control requirements of motors and have higher reliability than optical encoders. In the case of slightly lower control accuracy and no overload requirements, sensorless vector control can be used to save the cost of the angle measuring device. The life of the whole motor depends on the service life of the bearing. The motor housing is protected by IP54. In special circumstances, it can be increased to IP65, which can meet the requirements of most dust and humid environments. In the case of ensuring that the coaxiality of the motor shaft extension installation is good and the radial load of the rotating shaft is appropriate, the minimum service life of the motor bearing is more than 20,000 hours. Followed by the life of the cooling fan, the fan uses a single-phase 220V shaded pole motor, the service life is longer than the capacitor running motor. When operating in a dusty environment for a long period of time, it is necessary to periodically remove the viscous substances attached to the fan to prevent the fan from being burnt due to excessive load.
3.2 Failure and protection of permanent magnet materials
The development of permanent magnet motor is closely related to the development of permanent magnet materials. Since the beginning of the 21st century, with the continuous improvement and perfection of permanent magnet materials, high remanence density, high coercivity, high magnetic energy product and linear demagnetization curve The excellent magnetic materials are particularly suitable for the manufacture of electric motors, especially the improvement of the thermal stability and corrosion resistance of NdFeB permanent magnets and the gradual reduction of the price, so that the research and use of permanent magnet motors have achieved rapid development.
The importance of permanent magnet materials for permanent magnet motors is self-evident, and its cost accounts for nearly a quarter of the cost of the entire motor. In this regard, our company has also established enterprise standards for permanent magnet materials, including corrosion resistance, consistency, high temperature demagnetization test, and linear demagnetization curve test. The current permanent magnet material has been able to operate for a long time under the allowable temperature rise of the motor winding limit, and the demagnetization rate is within 2%. Conventional permanent magnet materials require that the surface coating be subjected to a salt spray test of more than 24 hours. For environments with severe oxidative corrosion, the user should contact the manufacturer to select a permanent magnet material with a higher protection technology.
3.3 coil burnout
The failure rate of the conventional asynchronous motor coil burnout is as high as 8% or more, which is mainly related to the thermal protection of the motor and the quality of the electrical material. Traditional asynchronous motors have almost no thermal protection components, and manufacturers that pursue output are also greatly discounted in the process of motor insulation treatment. The motor after maintenance is weaker in insulation treatment. The CM500 series permanent magnet synchronous motor coils are embedded with thermal elements. When the temperature rise of the coil reaches the F-class insulation limit temperature rise of 105K, the driver uses the temperature signal collected by the thermal element to protect the motor from overheating to ensure the safe operation of the motor. At the same time, the motor stator adopts two vacuum immersion paint processes, which greatly improves the stator qualification rate.
4 Conclusion
From the analysis of economic benefits: permanent magnet synchronous motor is especially suitable for use in restarting light operation. The promotion of permanent magnet synchronous motor has positive economic and social benefits, and is of great significance for energy saving and emission reduction. Permanent magnet synchronous motors also have valuable advantages in terms of reliability and stability. Therefore, the selection of high-efficiency permanent magnet synchronous motor is a long-term benefit of a one-time investment.
