# What is the emf equation of a DC generator?

## What is the emf equation of a DC generator?

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 do you calculate the torque of a DC generator?

Torque or moment or moment of force is the tendency of a force to rotate or move an object about an axis. A force is a push or pull, likewise, torque is a twist to an object. Mathematically, torque, T = F × r.

What is torque in DC generator?

The conductors lie near the surface of the rotor at a common radius from its centre. Hence, a torque is produced around the circumference of the rotor, and the rotor starts rotating. When the machine operates as a generator at a constant speed, this torque is equal and opposite to that provided by the prime mover.

### What is equation of back EMF of DC motor?

For a DC motor, magnitude of the back emf is given by the same emf equation of a dc generator i.e. Eb = PɸNZ / 60A.

### How do you calculate the emf of a generator?

We use Faraday’s law of induction to find the average emf induced over a time Δt: emf=−NΔΦΔt. We know that N=200 and Δt=15.0ms, and so we must determine the change in flux ΔΦ to find emf. Solution: Since the area of the loop and the magnetic field strength are constant, we see that ΔΦ=Δ(BAcosθ)=ABΔ(cosθ).

How do you calculate the emf?

The emf is equal to the work done on the charge per unit charge (ϵ=dWdq) when there is no current flowing. Since the unit for work is the joule and the unit for charge is the coulomb, the unit for emf is the volt (1V=1J/C).

## How do you calculate electromagnetic torque?

To find the total torque, it is necessary to sum the elementary torques appearing from the interaction of the magnetic field in the gap with the surface elements of the rotor. The torque from all electromagnetic forces along the contour of the rotor is determined by integrating the torque (3) along this contour.

## What is torque in DC motor?

The torque is defined as the turning moment of a force about an axis. It is measure by the product of the force (F) and perpendicular distance (r) of the line of action of force from the axis of rotation, i.e., Torque,𝜏=𝐹×𝑟…(

What is back EMF in DC generator?

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.

### What type of emf is induced in 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.

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