0
Variable frequency drives use a rectifier to "chop off" the top part of the ac wave, then use capacitors to "fill in" the gaps in the voltage, making a "near dc" power. They use IGBTs, a fancy term for a high speed, high current transistor, or electronic switch, to pulse the "near dc" power out to the motor, in a pattern that appears like ac to the motor.
Wiki User
∙ 11y ago
Add your answer:
Earn +20 pts
What is the Opposition to current flow in a inductive ac circuit?
Back EMF.
Are diodes only used in a dc circuit?
There are lots of diodes - a "diode" is simply a device that has two electrical connections.If you refer specifically to the rectifying diode, it is used to convert AC current to DC current - so, it is used in a circuit that has BOTH AC and DC.
What is a voltage rectifier?
A rectifier is a device that is used to "change" (rectify) some kind of alternating current (AC) into direct current (DC). There is more to the story, but basically the rectifier is a "one-way" device that will permit current to flow though it in only one direction. That way one or more of these devices can be used in different curcuit configurations to change an AC input into a DC output.
Why UPS is not charging on Inverter?
UPS (UNINTERUPTED POWER SUPPLY ) Its charg only AC current (Alternating current). and inverter provide current DC TO AC ( Direct current to Alternating current)
What instruments do AC to dc current use?
I would assume that you mean what devices do you use to convert ac current to dc current?The answer is Diodes.seediode-bridge
What is ac and DC current?
AC stands for alternating current and means that the current changes directions, flipping repeatedly from positive to negative and back again.DC means direct current, the current only flows in one direction and does not change polarity.
What can change AC current into DC current?
Rectifier
Did capacitor allow change in current?
capacitors allow ac current to flow.
What can change an ac current to a DC current?
rectifierac motor - dc generator set
Electric current in which electrons repeatedly change direction?
AC
In an ac circuit?
current flows back and forth APEX
The change from negative to positive and from positive to negative in an alternating current?
Is called AC voltage or current.
How did nikola teslas accomplishments change the world?
One of the most important things he did was create AC current or alternating current. AC current is used in the light bulbs we use today.
How do you change DC to ac current?
Dc current can be changed to Ac current by using an undulator.Wrong!The devices that change DC to AC are:an electronic power invertera mechanical motor-generator set (only used in very high power stationary applications)an electromechanical vibrator (now obsolete)
What is the Opposition to current flow in a inductive ac circuit?
Back EMF.
What is the difference altarnet current and direct current?
Direct current= flows in one direction ... AC flows in back and forward ..
What is an electrical device that converts ac to dc?
if its already an ac y u need to convert!......Yes it need to change because in ac supply we need to change the frequency of current so ac to ac converter needed.The name of AC to AC converter is Regulator
