Types of D. C. Machines

On Dec 1, 2009 by Sunil Saharan At 9:13 AM | | 0 comments »
D. C. Machines are of four types. Every type D. C. Machines will be discussed here. Only D. C. Motor types viz. Series D. C. Motor, Shunt D. C. Motor, Compound D. C. Motor and Separately Excited D. C. Motor are discussed here.

What is a D. C. Motor ?


A D. C. Motor is an electrical arrangement or machine that take D. C. Input from the supply and produce mechanical power or torque. Technically, the input is given to machine via a commutator and machine produce torque which rotates the rotor.

Classification of D. C. Motor


There are two ways of classification of D. C. Motors.

  • Classification Based Upon Power Intake
  • Classification Based Upon Position of Magnetic Field System

Now we will discuss these classification in detail.

Classification Based Upon Power Intake


Based intake power type D. C. Machine is of two types viz. D. C. Motor and D. C. Generator.






Type Power Input Power Output
D. C. Generator Mechanical Power Electrical Power
D. C. Motor Electrical Power Mechanical Power

Classification Based Upon Position of Magnetic Field System


This is major and widely used classification system or type for both D. C. Motor and D. C. Generator. We will discuss this system only for D. C. Motor. Based on this system of classification ( According to location of field system ) , D. C. Motor are of four types :

  • Separately Excited D. C. Motor
  • Series D. C. Motor
  • Shunt D. C. Motor
  • Compound D. C. Motor

Separately Excited D. C. Motor


In separately excited D. C. Motors, the field system is located on stator and is completely separated from armature and other parts. In separately excited D. C. Motors the magnetic field is produced either by an electromagnet mounted on pole hosted on stator of the motor.

In short we can say that in separately excited D. C. Motors the excitation is electrical separated from armature. The circuit diagram is shown below
 Separately Excited D. C. Motor

Series D. C. Motor



Sometimes in D. C. Motors the magnetic field is produced by an inductor or a solenoid type electrical component connected in series with the armature coil. This arrangement is called Series D. C. Motor.
The circuit diagram is shown below
 Series D. C. Motor

Shunt D. C. Motor



Sometimes in D. C. Motors the magnetic field is produced by an inductor or a solenoid type electrical component connected in parallel with the armature coil. This arrangement is called Series D. C. Motor.
The circuit diagram is shown below
 Shunt D. C. Motor

Compound D. C. Motor



Sometimes in D. C. Motors the magnetic field is produced by an inductor or a solenoid type electrical component connected in both series and parallel with the armature coil. This arrangement is called D. C. Compound Motor.
The circuit diagram is shown below
 D. C. Compound Motor

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