# What is the emf equation of DC motor?

## What is the 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.

What determines DC motor speed?

DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and 1000-5000 rpm for DC fractional hp motors.

What is emf full form?

Electromotive force (EMF) is equal to the terminal potential difference when no current flows. EMF and terminal potential difference (V) are both measured in volts, however they are not the same thing. EMF (ϵ) is the amount of energy (E) provided by the battery to each coulomb of charge (Q) passing through.

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

If the machine DC Machine is working as a Motor, the induced emf is given by the equation shown below. In a motor, the induced emf is called Back Emf (Eb) because it acts opposite to the supply voltage.

What is the EMF equation of a DC motor?

EMF Equation of a DC Motor The basic DC motor’s E.M.F equation is given below. Eb = PΦNZ / 60A

How does an electric motor convert mechanical energy?

An electric motor is an electrical machine that converts electrical energy into mechanical energy. The reverse of this would be the conversion of mechanical energy into electrical energy and is done by an electric generator.

#### What does back EMF stand for in robotics?

In motor control and robotics, back-EMF often refers most specifically to actually using the voltage generated by a spinning motor to infer the speed of the motor’s rotation for use in better controlling the motor in specific ways.