HomeElectricalElectric Motor - Types, Structure, Back EMF, Efficiency, Starter, RPM

Electric Motor – Types, Structure, Back EMF, Efficiency, Starter, RPM

Electric motor is one kind of electro-mechanical machine which converts electrical energy to mechanical energy.

In this article (electric motor ), we are going to discuss the following things:

  1. Types of motors
  2. Motor structure
  3. Motor torque
  4. Motor opposite voltage or Back EMF
  5. Motor Winding
  6. Shunt Winding
  7. Series winding
  8. Motor RPM
  9. Motor Efficiency and Loses
  10. Motor Starter

Electric motor

What is the motor?

Actually, the motor is a machine that transforms electrical energy into mechanical energy. We know that the electrical power as input and the mechanical energy we get output by Motor. Motor and generator structure is the same. But in the opposite of one another in the workplace.

Types of Motors

The motor is mainly divided into two parts.

  1. AC motor
  2. DC motors

AC Motor:

Water pumps, fans, etc drives by AC motors. AC motor is an electric motor which is operated by an alternating current.

DC Motor:

There are many types of DC motors. There are many types of DC motors available in the market. Some of them are found to be less or more of the torque, and some of RPM is too much or less.

Following DC motor can be found in the market:

  • Gearless motors
  • Gear motors
  • Stepper motor
  • Servo motor

Motor structure

There is no difference between DC Motor and DC Generator structural aspects. But they are the opposite kind of work.

DC motors are mainly of two parts:

  1. Stator
  2. Rotor


Generally, it is a steady supply of electricity and accepts electricity.


It is a rotating part that creates mechanical rotation.

Besides, there are many parts made of motor

  • Yoke or frame
  • DC motor poll
  • Field winding
  • Armature Winding
  • Commutator
  • Brush

All parts are made up of DC motors.

Motor Torque

If the value of the energy produced from the opposite side is multiplied by their internal angle then the value can be seen as a torque. That is the power of the distance.

In formally,
When the current generates current forces flowing through the conductor and the conductive clock tries to turn the wise, then the friction propagation is called torque. The quality of the torque is equal to the length of the ball and the distance from the center of the rotation.

T = F * r
T = Torque,
F = Force
r = Length distance from the spinning center

Motor Winding

Motor winding refers to the cable patch or the coil is meant. Motor winding will remain in each motor and generator.

Motor Shunt and Series Winding:

The kind of cables that are clothed in the cables is called shunt-winding. This type of coil is very patch and its resistance is much more.

The series is completely opposite of winding. The patch here is low and the current can flow very smoothly.

Motor RPM

The RPM is the RPM, which is the revolutions per minute, how many times a rotator can complete the rotation in one minute. Motors, they are mentioned in the vehicle specification. The greater the rotation capacity of the RPM, the higher the rotation capacity.

Motor Efficiency and Loss

Efficiency is the ratio of output and input power of the motor. It’s never possible to get 100 percent of the efficiencies of Motor. The reason behind this is some losses or losses. It is the loss of the copper loses of the motors, the loss of the iron of the motors, the mechanical damage of the motor, the strength of friction, the back EMF, etc.

Motor Starter

There is a part called Starter inside DC Motors, whose work is to start a motor with a specific voltage. It has a type of auto variable resistor that does not allow the starter to turn on the motor until it is reached in a specific voltage.

Read Working principle of DC  motor

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Md. Nazmul Islam
Md. Nazmul Islam
Greetings, I have completed my graduation from EEE background, currently working as an Android Apps Developer. Here is my specialty and I am engaged with it. 1. Android Developer 2. Search Engine Optimization 3. Content Creator If you have any queries or want to say hi, don't hesitate to message me.

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