# What is emf equation of DC motor?

## What is emf equation of DC motor?

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 induced emf of a dc motor?

1. φ = Flux per pole in Weber.
2. Z = Total number of armature conductors.
3. N = Armature rotation in revolution per minute (rpm).
4. P = Number of poles.
5. A = Number of parallel paths in armature.
6. E = EMF induced in any parallel path or generated emf.

## What is dc generator PDF?

A dc generator is an electrical machine which converts mechanical energy into direct current electricity. This energy conversion is based on the principle of production of dynamically induced emf.

## 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.

## What’s the full form of emf?

Electromotive force (EMF) is equal to the terminal potential difference when no current flows. EMF (ϵ) is the amount of energy (E) provided by the battery to each coulomb of charge (Q) passing through.

## What is back emf and its equation?

The power from each device is calculated from one of the power formulas based on the given information. The back emf is ϵi=ϵS−I(Rf+REa)=120V−(10A)(2.0Ω)=100V. Since the potential across the armature is 100 V when the current through it is 10 A, the power output of the motor is Pm=ϵiI=(100V)(10A)=1.0×103W.

## What is the back emf in DC motors?

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).

## What are the basic principle of DC generator?

A DC generator operates on the principle of Faraday’s laws of electromagnetic induction. According to Faraday’s law, whenever a conductor is placed in a fluctuating magnetic field (or when a conductor is moved in a magnetic field) an EMF is induced in the conductor.

## What are different types of DC generator?

A Clear Classification of DC Generators

• Types of DC Generators. Permanent Magnet DC Generators.
• Separately Excited DC Generators.
• Self-Excited DC Generators. Shunt Wound DC Generators. Series wound generators. Compound Wound DC Generators. Long Shunt Compound DC Generators.

## What is back EMF formula?

The back emf is calculated based on the difference between the supplied voltage and the loss from the current through the resistance. The power from each device is calculated from one of the power formulas based on the given information. The back emf is ϵi=ϵS−I(Rf+REa)=120V−(10A)(2.0Ω)=100V.