Safety and reliability are the first and most critical factors for measuring DC contactors of electric vehicles, which are mainly reflected in arc extinguishing capability and insulation voltage. Some paragraphs of the article content are taken from the Internet and are for learning and communication only. If there is any infringement, please contact us! We will delete it in time. BSB Electrical Appliances. Difference between DC contactor and AC contactor The function of the contactor is functionally used to isolate and cut off or pull in the electrical circuit.
AC contactor has the following characteristics: The core and armature are made of silicon steel sheets; AC voltage pull-in coil has large impedance; Short-circuit rings are embedded in both the dynamic and static armature; It has main contacts that are turned on or off and auxiliary contacts of varying numbers.
In principle, the dc contactor should have no ac contactor. However, the core in the coil of the dc contactor will not generate eddy current and there is no heating problem in the dc core. Therefore, the core can be made of whole cast steel or cast iron. The coil of dc circuit has no inductive reactance, so the number of turns of the coil is more, the resistance is big, the copper loss is big, so the coil itself is hot, in order to make the coil heat dissipation is good, the coil is usually made into a long and thin cylinder.
The coil of ac contactor has fewer turns and small resistance, but the iron core is hot. The coil is generally made into a thick and short cylindrical shape, and there is a certain gap between the coil and the iron core, so as to facilitate heat dissipation and avoid the coil from being burned. In order to eliminate the vibration and noise generated by the electromagnet, the ac contactor has a short circuit ring embedded in the end face of the static core, while the dc contactor does not need a short circuit ring.
Previous: Ac contactor installation debugging and daily inspection matters. Next: Circuit wiring diagram of contactor interlock reversing control. Back Diaphragm Coupling Rigid Coupling. Back Air Blower Regenerative Blower. Back Data Acquisition. Back Data Transfer Unit. Back Air Compressors. Back Industrial Camera Lenses. Back Laser Marker. Shopping Categories. Main differences between AC contactor and DC contactor : Iron core of AC contactor would generate eddy current and hysteresis loss, while the DC contactor has no core loss.
Therefore, iron core of AC contactor is made of laminated silicon steel sheets, which is generally in E shape, while the iron core of DC contactor is made of complete soft steel, which is generally in U shape. As single-phase alternating current passes through AC contactor, a short circuit ring is embedded on the end of the static core to eliminate vibration and noise generated by electromagnet. However, the DC contactor doesn't need the short circuit ring. AC contactor adopts a grid arc extinguishing device while the DC contactor adopts a magnetic quenching arc extinguishing device.
AC contactor has a large starting current, its maximum operation frequency is about times an hour, while that of DC contactor can be times an hour. Tags: difference between , ac contactor , dc contactor. How to Repair AC Contactors? Basic Structure of AC Contactor. Leave your comment. Blog search.
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