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Why Back EMF occur in only dc motor?
It doesn't. It exists in all electrical machines, d.c. or a.c., motor, generator, or transformer.
What is the difference between a DC motor and a generator in terms of EMF?
During the operation of a DC motor, EMF is created across its terminals using an external source. Whereas, in a DC generator EMF is created across its terminal based on principle of dynamically induced EMF. So talking in terms of EMF, in DC motor EMF is consumed by the motor coil and utilized to rotate the axle. On the other hand, in DC generator EMF developed across coil is transfered to a load or a battery and consumed by them.
The back emf indcuced in the armature is AC or DC?
only in dc motor...
What is Back emf of DC motor?
In dc motor, the armature conductors are revolving in the magnetic field and emf is induced in the armature conductors. The direction of the induced emf is in opposite direction to the applied voltage as per Flemings left hand rule. So, the induced emf in motor is called as back emf or counter emf. Vydehi
Derive emf equation of a DC machine?
equation of ac machine
Why back emf effect is vanished in case of inductor if dc input is given?
The fluctuation of the AC which sets up an magnetic field and causes a reverse emf is lost with DC because there is no variation in the field.
What does an increase in field strength in a dc generator causes a?
increased Back emf
What is mechanical loss in dc machines?
Friction and windage causes mechanical loss in DC machines.
Why transformer not produce DC current?
because transformer in made inductorAlternative AnswerTransformers are AC machines, and do not work with DC. This is because they require an alternating current to set up an alternating magnetic flux which then induces an alternating voltage into its secondary. Remember, there has to be a changing magnetic flux and a conductor for an emf. to be induced into that conductor.
Why a dc generator you unable to generate emf even its armature is rotating?
bad connection
How much emf is needed for running a dc motor?
It depends entirely on the design of the motor.
What is the difference between Counter-electromotive force and back emf?
They are Same for dc motor
