Kangyu Electrical has 18 years of experience in low-voltage electrical production
Why do air conditioners use DP contactors
In electrotechnics, because can quickly cut off the ac and dc main circuit and can frequently connected with large current control (some don't up to 800 amps) circuit of the device, so often used in motor as control object, also can be used as a control plant equipment, electric heater, machine tools and all kinds of power units and so on electric power load, contactor can not only connect and cut off the circuit, but also has a low voltage protection. Contactor has large control capacity, suitable for frequent operation and remote control. It is one of the important components in automatic control system. In industrial electrical industry, contactor has many types and the current varies from 5a-1000a, which is quite widely used.
The ac contactor USES the main contact to open and close the circuit and the auxiliary contact to conduct the control circuit. The main contact is normally open contact, and the auxiliary contact often has two pairs of normally open contact and normally closed contact, small contactor is often used as the intermediate relay with the main circuit. The contact of the ac contactor is made of silver tungsten alloy with good electrical conductivity and high temperature ablative resistance. The power of ac contactor action comes from the magnetic field generated by ac through the coil with iron core. The electromagnetic iron core is composed of two "mountain" shaped silicon steel sheets. To stabilize the magnetic force, a short circuit ring is added to the drawing surface of the core. After the ac contactor loses power, it is reset by spring. The other half is a movable core, which is constructed like a fixed core to drive the closure and disconnection of the main and auxiliary contacts. The contactor above 20 amperes is equipped with arc extinguisher, which can quickly break the arc and protect the contact by utilizing the electromagnetic force generated when the circuit is disconnected. The contact instrument can be operated at high frequency, and the highest operating frequency can be up to 1200 times per hour when the power is turned on and off. The service life of contactors is very high, the mechanical life is usually millions of times to 10 million times, the electrical life is generally hundreds of thousands of times to millions of times.
Ac contactors are made as a whole, and their shape and performance are improving, but their function remains the same. No matter how advanced the technology is, the ordinary ac contactor still has its important position. The air type electromagnetic Contactor is mainly composed of a contact system, an electromagnetic operating system, a support, auxiliary contacts and a housing (or chassis). Because ac electromagnetic contactor coil generally USES ac power supply, after the contactor excitation, usually there will be a high decibel "up" noise, which is also the characteristics of electromagnetic contactor. After the 1980s, various countries studied the silent and power-saving of ac contactors electromagnets. One of the basic feasible schemes is to reduce the voltage of ac power transformer and convert it into dc power through internal rectifier. However, this complex control mode is not common. Vacuum contactor vacuum contactor is a contactor whose contact system adopts vacuum degaussing chamber. Semiconductor contactor semiconductor contactor is a kind of contactor that completes the current operation by changing the on state and off state of the circuit circuit. Permanent magnet contactor permanent magnet ac contactor is a kind of micro-power contactor which is formed by using the principle that the same magnetic poles repel and opposite poles attract.
Wenzhou Kangyu Electric Co., Ltd.
Add:NO.136-138,XinGuang Road,XinGuang Industrial Zone, Liushi,Yueqing, Wenzhou, Zhejiang, China 325604
Postal Code：325604
Tel.:0086-0577-27870130 / 62729766
Fax: 0577-27870888
E-mail：info@kayal.cc
