Analysis of advantages of high voltage frequency converter
1. The range of high voltage inverter is 0～100. If the mechanical strength of the motor and load is allowed, the motor can also run overspeed if the motor is not overcurrent. The speed range of the fluid coupling is generally 40～95. That is, the high-speed section causes a speed loss of about 5, which affects the output of the unit; and the hydraulic coupling, at the lowest level, can only reach a rated speed of 40. In some cases, it cannot meet the demand for speed control, and in some cases affects the further development of energy-saving benefits.
2. The high-voltage frequency converter has a high efficiency (>96) in the whole speed range; and the lower the speed is, the lower the efficiency of the fluid coupling is, and the smaller the loss, the energy saving effect of speed regulation. Great discount.
3. The high-voltage frequency converter realizes a true soft start of the motor and the load machine and completely solves the start-up shock problem. If the process requires, the motor can be repeatedly started in a short time; and the fluid coupling cannot solve the motor start-up problem. Still in order to start directly, the device needs to be started, the starting shock is also large, and it cannot be started frequently.
4. When using a high-voltage inverter to speed-regulate the motor, simply disconnect the original switch and the connecting cable of the motor, add the inverter, and do not change the connection relationship between the motor and the machine, and do not change any foundation, nor exist. Site constraints; while using turbo couplings for speed control, the fluid couplings must be connected in series with the shafts of the motor and the machine. The equipment foundation must be moved and refilled. Space may not be allowed in some places.
5, using high-voltage inverter to speed the transformation of the motor, once the inverter fails, the motor can also be directly linked to the frequency grid operation, will not result in production losses; and fluid couplings for the motor and mechanical connection, once the hydraulic Coupling failure, the load machine will not be able to run, only to stop the maintenance of fluid couplings, resulting in stop production losses.
High-voltage frequency converter is a high-tech equipment, high reliability, basic maintenance-free; and fluid coupling is a mechanical equipment, which itself includes oil, waterway and other sets of systems, high failure rate, maintenance workload, resulting in effective production time shorten.
6, high-voltage inverter will not increase the cost of motor speed, and low-speed large-capacity motor with a fluid coupling speed, the cost of fluid coupling will greatly increase, and sometimes even can not be achieved.
7, for the general motor speed control, the use of high-voltage inverter than the initial investment in fluid couplings to be larger, but in the future almost no need to run the inverter operating costs. The fluid couplings need frequent maintenance, including the maintenance of a special maintenance team, often spend money to change the oil, and so on, the operating costs are higher.
8, high-voltage inverter has a high level of intelligence, speed control accuracy, can also directly close the loop to improve the automation level of the factory, reduce staff, improve the working environment, reduce the workload; and hydraulic coupling speed accuracy Poor, not to mention automatic control, but no way to interface with computers, leaking oil, and the site is often dirty, resulting in a very poor environment.
In short, if the user needs to adjust the speed of the equipment, from our point of view, if the funds are not particularly critical, it is recommended not to use a fluid coupling.
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