The difference between power frequency screw machine and permanent magnet frequency conversion

The difference between the power frequency screw machine and the permanent magnet frequency conversion screw machine is mainly reflected in the following aspects:

Detailed analysis:

1. Driver method:
   • The industrial frequency screw machine adopts a fixed speed mechanical structure and directly drives the motor through the industrial frequency alternating current. This method is simple and reliable, but lacks flexibility.
   • The permanent magnet frequency conversion screw machine adopts frequency conversion technology to control the speed and power of the permanent magnet synchronous motor through the inverter. This method can accurately adjust the motor speed and power according to actual needs, making it more flexible and efficient.
2. Speed ​​and Power Adjustment:
   • The speed and power of the power frequency screw machine are basically fixed and cannot be adjusted according to actual needs. This results in less energy efficiency when partial loads are running.
   • Permanent magnet frequency converter screw machine can accurately adjust the motor speed and power according to actual needs to achieve efficient operation. Especially when partial loads are running, the energy efficiency advantages are significant.
3. Energy Usage Efficiency:
   • Energy frequency screw machines are relatively low in energy use efficiency, especially when partial loads are running, and have low energy efficiency.
   • Permanent magnet frequency converter screw machine has higher energy utilization, especially when operating in part of the load, the energy efficiency advantages are significant. This helps reduce long-term operating costs.
4. Starting method:
   • Power frequency screw machines usually use direct start or star triangle start, which has a great impact on the power grid during startup.
   • The permanent magnet frequency converter screw machine adopts frequency conversion soft start, which has little impact on the power grid during startup, which is conducive to protecting the motor and the power grid.
5. Operation stability:
   • The power frequency screw machine has stable performance and low noise, but limited adjustment range.
   • Permanent magnet frequency converter screw machine not only has high stability, but also has a wide range of adjustments, which can cope with complex and variable gas needs.
6. Maintenance:
   • Maintenance and maintenance of the power frequency screw machine is relatively simple, but the motor and transmission parts are worn more severely.
   • Permanent magnet frequency converter screw machine has less wear due to precise control of motor speed and power. But maintenance requires certain professional knowledge and skills.
7. Applicable scenarios:
   • The power frequency screw machine is suitable for situations where the gas volume is stable and the air pressure is not high.
   • Permanent magnet frequency converter screw machine is suitable for occasions where gas volume changes greatly and high air pressure requirements, such as semiconductor manufacturing, precision processing and other fields.
8. Cost:
   • The initial investment of the power frequency screw machine is low, but the long-term operation cost is high.
   • The initial investment of permanent magnet frequency converter screw machines is high, but due to the high energy efficiency, the long-term operating cost is low. In the case of a long service life of the equipment, the overall cost of the permanent magnet frequency converter may be more advantageous.

Summary:

There are advantages and disadvantages of the power frequency screw machine and the permanent magnet frequency converter. When choosing, comprehensive consideration should be made based on factors such as actual gas use needs, energy use efficiency, operating stability, maintenance costs and long-term operating costs. For occasions where the gas volume varies greatly and the air pressure requirements are high, permanent magnet frequency conversion screw machines may have more advantages.