1. Change the frequency of power supply, i.e. use frequency converter. The advantage of frequency converter is that it can provide a closed-loop control for vacuum pump, but it is easy to cause torque loss under large load.
2. Change the transmission ratio of the gearbox. It is a very economical way to change the transmission ratio of the gearbox of the vacuum pump, but it can only provide a single uncontrollable speed. Vacuum pump has different design, they have their own characteristics and advantages and disadvantages. For a long time, the use cost of vacuum pump is an important factor that affects people's choice of vacuum pump. After research and development, it has great advantages in stability and maintenance cost in the future.
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