Was established in 1998, is a collection of r & dproduction, trade as one of the high-tech company, the company specializes in manufacturing various micro-motor shaft...
Was established in 1998, is a collection of r &d production, trade as one of the high-tech company, the company specializes in manufacturing various micro-motor shaft...
Our machine including large CNC lathe, CNC machining center, CNC centerless grinding machine, CNC Incisive grinding machine, CNC cylindrical grinding machine, heat treatment machine.
Discussion on Variable Frequency Speed Regulation Scheme of High Voltage Motor
With the continuous development of electric power, electronic technology and computer technology, the frequency conversion technology of AC motors has been increasingly perfected and developed rapidly. Low- and medium-capacity low-voltage frequency conversion (below 690 V) has been widely used. In addition to saving energy and reducing consumption, it has become an indispensable key equipment in the fields of machinery, pump shaft papermaking, metallurgy, petrochemicals, mining, building materials, and electricity. However, for the large-capacity, high-voltage AC motor frequency control, in addition to price factors, a reasonable reform program or design, as well as comprehensive investment and cost-effective, has also become a factor restricting its widespread application.
1, the status of high voltage motor variable frequency speed control program
The high-voltage and large-capacity frequency conversion governor is a kind of difficult and high-tech high-tech. The difficulty of its development and production is as follows: because the high-voltage inverter has high power supply voltage, but the world's power electronic components have higher withstand voltage levels. Low; high-voltage high-power inverter technology is difficult, manufacturing technology also requires high. However, it is mainly used for the energy-saving operation of fans, pumps, etc. It requires low investment and repays the investment by saving electricity.
2, the classification and characteristics of high-voltage frequency conversion program
2.1 High-Low-High Plan
This solution uses a universal low-voltage frequency converter as the core, that is, a step-down frequency converter is added to the input side of the low-voltage frequency converter to reduce the 6KV/3KV to the input voltage of the low-voltage frequency converter; turning parts the input side of the frequency converter is added. A step-up transformer allows the output voltage to match the rated voltage of the motor. High-low-high frequency control solutions are common in the domestic market and are currently the most widely used ones. The market is mainly based on Siemens products. In this scheme, the DC power supply rectifier unit can be divided into 6 ripple rectifier units and 12 ripple rectifier units. 6 The system structure of the pulsating rectifying unit is simple and the cost of the hardware configuration is low; 12 pulsating rectifying units are composed of a three-winding transformer with a difference of 30 degrees on the secondary side and two identical rectifying units, and are in the transformer. The secondary side must be connected to the line reactor, so its relative cost is high, but from the perspective of harmonic components, the effect of 12-pulse rectification is better than 6-pulse, and the 6-pulse harmonic component is 5, 7, In 11, 13, 17, 19, 23, and 25 times, the 12-pulse harmonic component was 11, 13, 23, and 25 times.
The basic concept of the pump
A water pump is a machine that delivers or pressurizes a liquid. It transfers the mechanical energy of the prime mover or other external energy to the liquid, which increases the liquid energy. It is mainly used to transport liquids including water, oil, acid and alkali liquids, emulsions, suspoemulsions, and liquid metals, as well as liquids and gas mixtures. And liquids containing suspended solids. The technical parameters for measuring the performance of the pump include flow,turning parts suction, lift, shaft power, water power, and efficiency.
Pumps can be divided into three types according to the working principle of positive displacement pump, power type pump and other types of pumps. In addition to classification by working principle, it can be classified and named by other methods.
For example, according to the driving method can be divided into electric pumps and water wheel pumps; according to the structure can be divided into single-stage pumps and multi-stage pumps; according to the use can be divided into boiler feed pumps and metering pumps; according to the nature of the liquid can be divided into Water pump, oil pump and mud pump. The water pump is an indispensable mechanical equipment in the water conservancy project. In operation, it will inevitably lead to failure and damage, so that the water can not be delivered normally. Therefore, the poor water pump must be repaired and adjusted to eliminate the trouble in time.
How the pump works
The working principle of the water pump: The water pump can send the water out because of the centrifugal force. Before the pump works, the pump body and the inlet pipe must be filled with water to form a vacuum state. When the impeller rotates, the blade causes the water to rotate quickly, stainless steel shaft and the rotating water flies from the impeller under the action of the centrifugal force. The water in the pump After being thrown out, the center part of the impeller forms a vacuum area.
The water of Suwon was pressed into the inlet pipe through the pipe network under the effect of atmospheric pressure (or water pressure). With this endless cycle, continuous pumping can be achieved. What is worth mentioning here is: Before the pump starts, it must be filled with water in the pump casing before it starts. Otherwise, it will cause the pump body to generate heat, vibration, and reduce the amount of water, causing damage to the pump (referred to as "cavitation") Equipment accident.
Enter your e-mail above to facilitate contact us, you can fill in the second space inside the product name or model, we can also do OEM.
