2005 Foreign Inverter Applications And Market Trends - Control The Motor, Inverter - Hc Net

1 Introduction Current converter industries have been rapidly developing

, converter products, increasing the scale of industrial growth. Exchange converter since the 20th century came about 60 years to 80 years of the 20th century in the major industrialized countries has been widely used, but since the 90s from the 20th century, with the strengthening of environmental protection people to save energy, inverter applications becoming increasingly popular.

2 converter applications has become increasingly popular

Frequency control can be used in most of the motor drag occasions, as it can provide accurate speed control, so you can easily control the mechanical transmission of the rise and fall and the speed run. Frequency applications can greatly improve the process efficiency (speed does not depend on mechanical parts), and can be run than the original constant speed motor is more energy. Frequency of use of the following cite 10 reasons to explain the growing popularity of transducer used in the basic knowledge of foreign countries:

(1) control of motor starting current.

When the motor started directly by frequency, it will produce 7-8 times the motor rated current. The current value will greatly increase the motor windings of electrical stress and heat, thereby reducing motor life. The frequency conversion can start at zero speed zero voltage (of course, can only increase torque increase). Once established the relationship between frequency and voltage, inverter can be in accordance with the V / F or Vector Control drive to work load. Using the frequency control can fully reduce the starting current, to improve the affordability of winding, the user is the most direct benefits of the motor maintenance costs will further reduce the motor life is increased.

(2) reduce the power line voltage fluctuations.

Start the motor frequency, current surge at the same time, the voltage will be large fluctuations in voltage drop in the rate will depend on the size and start the motor of the power distribution network capacity. Voltage drop will lead to the same power supply network voltage sensitive equipment failure or abnormal working of the trip, such as PC, sensors, proximity switches and contactors with porosity, action error. The use of frequency control, due to zero pressure at zero frequency when the phase starts, you can eliminate the maximum voltage drop.

(3) lower power is required to boot.

Motor power and voltage and current proportional to the product, then the frequency directly activated by electrical power consumption will be significantly higher than the frequency of power needed to start. In some condition of its distribution system has reached the maximum limit, the direct frequency start the motor will surge generated by the other users on the same line have serious implications, which will be run by the grid operators warn, or even a fine . If the frequency converter to motor starting, stopping, they will not have a similar problem.

(4) controlled acceleration. In zero-speed frequency control start and smooth in accordance with the user's need to accelerate, and its speed curve can also choose to (line speed, S shaped speed or automatic speed). Frequency starts through, or linked to the motor shaft or gear mechanical parts will have a severe vibration. This vibration will further increase mechanical wear and tear, reducing mechanical and electrical life. In addition, the frequency converter can also apply online in a similar filling to prevent spilled inside the bottle or damage.

(5) adjustable speed. Frequency control to optimize the use of processes and can change quickly according to the process, but also remote control through the PLC or other controller to achieve the speed of change.

(6) adjustable torque limit. Through frequency conversion, it can set appropriate limits to protect the mechanical torque will not be damaged, thus ensuring the continuity of process and product reliability. The current conversion technology allows not only the torque limit is adjustable torque control accuracy can even reach 3% ~ 5%. In the frequency condition, the motor can only detect the current value or thermal protection to control, but not the same as in the frequency control value to set precise torque action.

(7) controlled stop mode. As controllable speed, as in frequency control, the stop means can be controlled, and there are different ways you can choose to stop (slow down parking, free parking, parking + DC braking deceleration), as it can reduce the impact of mechanical parts and motors, making the system more reliable, life will increase accordingly.

(8) Energy Centrifugal fan or pump with frequency converter can significantly reduce power consumption, which in 10 years of engineering experience has been reflected. As the final energy consumption is set up with the speed of the motor side ratio, so use the faster return on investment after conversion, factory prepared to accept.

(9) reversible operation control In the inverter control, to achieve operational control reversible reversible without additional controls, only need to change the output voltage of the phase sequence can be, it can reduce maintenance costs and save installation space.

(10) to reduce mechanical transmission parts

As the current vector control inverter synchronous motor with high torque output can be achieved, thereby saving gear boxes and other mechanical drive components, the final direct conversion transmission. Which can reduce the cost and space, to improve stability.

3 inverter products in the form of colorful

2004 saw an OEM inverter and upgrade the network to further enhance the frequency converter, matrix converter forming characteristics, which make different forms, different types, different functions of the inverter in the market, colorful.

3.1 OEM upgrade of inverter

For induction motor control method, the relative cost of ordinary workers start faster and more frequency, while the cost of converter will be higher, the volume will be greater, so a lot of automation machinery and equipment, the inverter is not using rates high mechanical business is not very active to install inverter, inverter with this or that despite the benefits. General-purpose inverter After several years of development, OEM inverter and in 2004, has made a key breakthrough, and to upgrade.

SEW's OEM products Movitrac LT

by: gaga

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