What are the advantages of high-voltage inverters compared with hydraulic couplings?

With the rapid development of modern power electronics technology and microelectronic technology, high-voltage and high-power variable frequency speed control devices have been continuously matured, and high-voltage problems that have been difficult to solve in recent years have been well solved by device series or unit series in recent years; The fluid coupling is a mechanical device that transmits the rotational speed by using a liquid medium. The active input shaft end is coupled with the original transmission, and the driven output shaft end is coupled with the load shaft end. The output shaft is adjusted by adjusting the pressure of the liquid medium. The speed is changed. Although both the high-voltage inverter and the fluid coupling are deployed around the pressure, in the course of use, we can find that the high-voltage inverter is obviously superior to the fluid coupling. Then the next small series is for everyone to introduce the comparison with the hydraulic coupling, the advantages of the high-voltage inverter is reflected in which aspects.

1. The speed range of the high-voltage inverter is 0-100. If the mechanical strength of the motor and the load is allowed, the motor can not flow too much, the inverter can also make the machine overspeed; the speed range of the fluid coupling is generally 40-95. That is, the high speed section causes about 5 speed loss, which affects the output of the unit; while the hydraulic coupling can only reach the rated speed of 40 at the lowest level. In some cases, the speed regulation needs cannot be met, and sometimes the energy saving benefit is further exerted.

2. The high-voltage frequency converter has high efficiency (greater than 96) in the whole speed regulation range; while the lower the speed regulation of the hydraulic coupling, the lower the efficiency, which brings about no small loss and the energy saving effect of the speed regulation. Great discount.

3. The high-voltage inverter realizes the real soft start to the motor and the load machine, completely solves the startup impact problem. If the process requires, the motor can be repeatedly started in a short time; and the fluid coupling can not solve the motor starting problem, the motor Still starting directly, the device needs to be activated, the starting shock is also large, and it cannot be started frequently.

4. When using the high-voltage inverter to adjust the speed of the motor, simply disconnect the original switch and the motor's connecting cable, and add the inverter. The connection between the motor and the machine is not changed, and no basis is changed. Site limitation problem; while the hydraulic coupling is used for speed regulation, the fluid coupling must be inserted into the connecting shaft of the motor and the machine. It is necessary to move and re-cast the equipment foundation, and some local space may not be allowed.

5. Use high-voltage inverter to adjust the speed of the motor. Once the inverter is faulty, the motor can also be directly connected to the power grid to run without causing loss of production. The fluid coupling is the connection between the motor and the machine. If the coupling fails, the load machine will not operate, and only the hydraulic coupling can be shut down for maintenance, resulting in loss of production.

The high-voltage inverter is a high-tech equipment with high reliability and basically maintenance-free. The hydraulic coupling is a mechanical device, which itself includes multiple systems such as oil passages and waterways. The failure rate is high and the maintenance workload is large, resulting in effective production time. shorten.

6. The high-voltage inverter will not increase the cost due to the high speed of the motor. However, the low-speed and large-capacity motor uses the hydraulic coupling to adjust the speed, and the cost of the fluid coupling will increase greatly, and sometimes it cannot be realized.

7. For the general motor to adjust the speed, the initial investment of using the high-voltage inverter is larger than that of the hydraulic coupling, but in the future, the inverter requires almost no running cost. The fluid coupling needs frequent maintenance, including raising a special maintenance team, often paying for water and changing oil, etc., and the operating cost is high.

8. High-voltage frequency converter has a high level of intelligence, high speed regulation precision, and can also directly operate in closed loop, improve the automation level of the factory, reduce the staff, improve the working environment and reduce the workload; and the hydraulic coupling precision is better. Poor, can not talk about automatic control, but also no way to interface with the computer, but also leaking water and oil leakage, the site is often dirty, resulting in extremely poor environment.

In short, if the user needs equipment to adjust the speed, from our point of view, if the funds are not particularly scarce, it is recommended not to use a fluid coupling.