Which type of emf is induced in the armature of DC generator?

Which type of emf is induced in the armature of DC generator?

purely AC
Hence, we can come to the conclusion that in a DC generator, the induced e.m.f in the armature is purely AC.

What is the emf equation of DC machine?

As the armature rotates, a voltage is generated in its coils. In the case of a generator, the emf of rotation is called the Generated emf or Armature emf and is denoted as Er = Eg. In the case of a motor, the emf of rotation is known as Back emf or Counter emf and represented as Er = Eb.

How can induced emf in the armature conductor of a DC generator be made unidirectional?

In a DC motor, the alternating current is produced by the rotation of the commutator. In the generator, the commutator facilitates the collection of current from the armature conductors and converts the alternating emf induced (AC) in the armature conductors to unidirectional emf (DC) in the external load circuit.

What is dc emf?

A Direct Current (DC) electromagnetic field refers to a constant or static DC electric or DC magnetic field emission which has a frequency of 0 Hz. DC magnetic fields can also be created from a DC power source of electricity such as battery power, solar power and wind power.

How do you find the induced emf of a DC generator?

Derivation for Induced EMF of One Armature Conductor P = number of poles in the DC generator. Where, N = speed of the armature conductor in rpm. Now, according to Faraday’s law of induction, the induced emf of the armature conductor is denoted by “e” which is equal to rate of cutting the flux.

What is emf in DC motor?

When the armature of the DC motor rotates under the influence of driving torque, the armature of the conductors moves through a magnetic field inducing an emf in them. The induced emf is in the opposite direction to the applied voltage and is known as the back emf.

Which rule is used to find the direction of the induced emf in a coil?

Therefore, the direction of the induced e.m.f. is determined by Fleming’s right-hand thumb rule.

What is induced emf?

Induced electromotive current is the induction of current in the loop just by changing the magnetic field. To be more accurate we can say that if the magnetic flux through a coil is changed then a voltage will be produced. This voltage is called the induced emf.

Why a back emf is induced into the armature?

When the armature of a DC motor rotates under the influence of the driving torque, the armature conductors move through the magnetic field and hence emf is induced in them as in a generator. The induced emf acts in opposite direction to the applied voltage V (Lenz’s law) and is known as Back EMF or Counter EMF (Eb).

How do you calculate induced emf of an armature conductor?

Derivation for Induced EMF of One Armature Conductor. For one revolution of the conductor, Let, Φ = Flux produced by each pole in weber (Wb) and P = number of poles in the DC generator. Now, according to Faraday’s law of induction, the induced emf of the armature conductor is denoted by “e” which is equal to rate of cutting the flux.

What is the induced emf in a DC generator?

Hence, it is called as split ring commutator. Hence, in a DC generator, the induced e.m.f. in the armature is AC. Was this answer helpful?

What is the difference between DC EMF and AC EMF?

As the number of conductors and the commutator segments increases, the DC output emf also increases and becomes more and more smoother. The emf induced in the armature is always an AC emf. Using commutator segments, the DC emf is collected and AC emf is collected using slip rings.

What is induced electromagnetic field (EMF)?

The polarity of induced emf depends upon the direction of the magnetic field and the direction of rotation. If either of the two is reversed the polarity changes, but if two are reversed the polarity remains unchanged. This induced emf is a fundamental phenomenon for all the DC Machines whether they are working as a generator or motor.