What is a high voltage contactor?
A high-voltage contactor, also called a high-voltage relay without distinction in the industry, is widely used in electric vehicles (EV) and hybrid electric vehicles (HEV). It is an electromechanical switching device with a coil to generate a magnetic force that mechanically operates an electric contact.
What are DC contactors?
A DC contactor is an electrically controlled device designed to switch current on and off. DC contactors control current in DC circuits by closing and opening internal contacts. DC contactors control much lower voltages than AC circuits and offer the benefit of minimal arcing as the circuit opens and closes.
What is the working principle of contactor?
Operating Principle of a Contactor:The current passing through the contactor excites the electromagnet. The excited electromagnet produces a magnetic field, causing the contactor core to move the armature. A normally closed (NC) contact completes the circuit between the fixed contacts and the moving contacts.
What is a contactor economizer?
In order to provide contactors with the highest possible performance in the smallest package the GX14, GX16, MX14, and MX16 contactors use a coil economizer. This allows the contactor to use a high powered coil during pull-in and a lower powered coil to hold the contacts in place once they have transferred.
Where are DC contactors used?
DC contactors provide a cost-effective and reliable method to switch current in low-voltage DC circuits. Industries that use our DC contactors include (but are not limited to) agriculture & construction, lawn & garden, marine, mobile hydraulics, heavy trucks, and electric vehicles.
What is difference between AC and DC contactor?
The DC contactor has a U shape, while the AC contactor has an E shape. The DC contactor has a maximum operating frequency of 1200 times per hour. In contrast, AC contactors have a maximum operating frequency of 600 times per hour. The AC contactor is designed to work at lower resistances, so they have fewer turns.
What are the types of contactors?
There are different types of contacts in a contactor, and they are; auxiliary contact, power contact, and contact spring. The power contact has two types that are; stationary and movable contact.
What is the difference between AC contactor and DC contactor?
What are the parts of a contactor?
A contactor consists of three basic parts: the operating coil, the associated magnetic circuit and the contacts that are actuated by the coil. Figure 1 is a representation of a very old type of contactor. It clearly shows the coil, the operating part of the magnetic circuit and a single contact.
Why contactor is used?
Why are Contactors Used? Contactors are used for high power applications. They allow a lower voltage and current to switch a much higher power circuit, so they are generally larger and more heavy-duty than control relays, enabling them to switch higher power loads on and off for many thousands of cycles (Figure 1).
How many types of contactors are there?
What is the difference between AC and DC contactor?
Why is a DC contactor bigger than an AC contactor?
The number of coils of the DC contactor is greater than the number of coils of the AC contactor. If the primary loop current is too large (ie> 250A), the contactor should use two-phase winding coils in series. The coil reactance of the DC relay is huge, but the power consumption of the current is less, or even smaller.
What are the applications of a contactor?
The most common application of contactor is in the starter that used to turn ON and OFF the equipment like motor, transformer, etc. A contactor is an electrically controlled switch used for switching a power circuit, similar to a relay except with higher current ratings.
Why AC voltage is preferred over DC voltage?
Due to following reasons, AC systems are preferred over DC systems: a. It is easy to maintain and change the voltage of AC electricity for transmission and distribution. b. From power stations, AC is produced so it is better to use AC then DC instead of converting it. d.
What is the voltage required for a DC motor?
to drive motors are typically more efficient at higher voltages. Typical DC motors may operate on as few as 1.5 Volts or up to 100 Volts or more. Roboticists often use motors that operate on 6, 12, or 24 volts because most robots are battery powered, and batteries are typically available with these values.
Can high DC voltage hurt you?
It affects the ability of the heart to pump blood, resulting in brain damage and eventual cardiac arrest. Either AC or DC currents can cause fibrillation of the heart at high enough levels. This typically takes place at 30 mA of AC (rms, 60 Hz) or 300 – 500 mA of DC.
How to generate high voltage with inductor?
Generating High Voltage with an Inductor. An easy way to generate a higher voltage from a low voltage DC source is with an inductor. Depending on the number turns of wire in the coil a 6 volt battery could produce a jolting 200V plus from a simple coil of wire. Fig. 1 illustrates how this was used to fire spark plugs in older vehicles.