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Presumably, you are describing the spring-charging mechanism on high-voltage circuit breakers? If so, then the reason is because, in the event of an electrical fault in which the substations loses its a.c. supply, the circuit breakers can be recharged from the standby d.c. batteries.
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Are DVD DC motors and DC motors same?
actually dc motors are of several types in which one of them are 1).brushed 2).brushless ...so the motor present in DVD are the brushless dc motors ...
Are the fan motors on fanuc ac spindle motors ac or dc?
usually ac 110v even on the dc motors
What is the Need of dc motor?
DC motors are not common in industry. However traction motors are one such main DC motor application. There are many tools, toys, drones, which use DC motors run by batteries.
Does DC motor run at a varying speed?
only shunt dc motors have varaible speed control. compound dc motors do however NT as much, plus they are just a mixture of series and shunt dc motors.
Where do you find dc motors?
Examples of DC electric motors are the starter in your car and the motor in a DC controlled elevator, to name just two.
What is the best type of DC motor for use with DC?
Basically anything that works with batteries usually works with DC motors, i.g. your hard drive, your cellphone vibrator, toys, etc. Also, even for large motors, the DC motor has the advantage of being easily controlled by input voltage. Induction motors, on the other hand, can use controlled input voltage but they will have to deal wth low torque when the voltage is low. DC motors are used for those little fans in your computer. Also, CD players also use DC motors to spin the discs. DC motors are important where absolute speed control and feedback are necessary. For your household appliances, including fan motors, those are AC motors, cheaper for the industrial strength and more efficient.
Why DC motors and DC generators are commonly known as DC machines?
because the dc motor will act as dc generator as same as dc generator acts as a dc motor .so it is called as dc machines.AnswerBecause generators and motors are machines, and operate on d.c.'A.C. machines' are generators, transformers, and motors which operate on a.c.
What type of DC motor used by fan?
DC motors are commonly used in cars and normally run on 12 v. DC motors can be broadly classified as series-wound and parallel-wound and for fans the parallel-wound version is used with the field winding placed in parallel with the armature (for domestic use AC fans using induction motors are normally used).
who is more efficient dc motor or ac motor and why?
DC motors are generally more efficient than AC motors. DC motors have a lower amount of inertial associated with them, making them more efficient to run.
Why dc series motors cannot be used in home?
DC series motors run on DC power. Homes have AC power, not DC power. You could use DC motors in homes if you have a power supply or use a battery, but it is usually more cost effective to use an AC motor.
What are the two types of dc motors?
permanent magnet motors and series motor
Why does modern hybrids use ac synchronous motor instead of dc series motors?
Toyota uses AC motors, Honda uses DC motors. It varies with design goals.
