Differences between the hydraulic motor drive and motor drive
Hydraulic system has been more widely used in various industrial sectors and in many sectors agriculture, forestry, animal husbandry and fishery, and the more advanced equipment, some of which use the hydraulic system on the more.
In paper, textiles, plastics, rubber and other light industry, the paper machines, textile machines, injection molding machines, rubber briquetting machines and other equipment have an extensive use of the hydraulic system. In mining, petroleum, metallurgy, pressure processing and other heavy industry, the hydraulic system is more widely used because it can deliver a lot of energy and weight of the device is smaller than others. For example, the hydraulic system on the device holder mine, oil drilling platforms, blast furnace top equipment, billet caster, strip mill reduction systems, presses and quick forging machines, all of them are used the system. In other industries such as electric power, construction, water conservancy, transportation, shipbuilding, aerospace, automotive and so on, the hydraulic system is also an important component. As for the extensive use of advanced technology sectors such as aerospace, military and others, hydraulic system is widely used. The machine tool industry was one of the first to use hydraulic technology. At present, the motor drive technology development in exchange for leaving the motor drive inverter technology to recapture a lot of hydraulic drive range of applications, but in the power drive and reciprocating motion of the occasion, the hydraulic system are still widely used.
Advantages and disadvantages of hydraulic transmission system
The widely used transmission mode are mechanical transmission, electric drive, hydraulic drive and pneumatic drive. Each have their own advantages and disadvantages. Mechanical transmission is carried out by transmission gear, rack, worm, worm gear, belt, chain, levers and other mechanical parts, it is the development of the earliest and most common form of transmission. It has a transmission is accurate and reliable, simple, intuitive and easy to grasp mechanism, the load change has less impact on the drive ratio and the environmental impact is small. But for the automatic control, simply by mechanical transmission to complete the structure becomes complicated and cumbersome, meanwhile it has some disadvantages, for example, being difficult to operate long-distance, large operating force, the freedom of mounting position change is so small, so gradually in many cases other transmission manner replace it.
Electric drive is carried out by electric drive and control, using AC motors to drive, simple and cheap, therefore it is the most widely used and also the various transmission components. But AC motors are generally difficult to perform continuously variable transmission, which can be achieve by a DC motor, but more expensive. Currently thyristor AC motor technology enables a continuously variable transmission is greatly simplified, but the application in high-power and low speed high torque and other occasions has yet to be further improved. Electrical control, in particular computer control, with signal transfer and change convenient, easy remote manipulation and other unique advantages, so in situations that require high degree of automation is essential.