Types of DC Motor

There are 4 major types of DC motor. They are:

  • Series DC Motor
  • Shunt/Parallel DC Motor
  • Compound DC Motors
  • Permanent Magnet DC Motor

In the case of Permanent magnet DC motor, permanent magnets are used to create field flux. Rest three types are classified based on the electrical connections between stator and rotor. Each of them has unique torque/speed.

Types of DC Motor

We know that there are two types of motor, namely AC and DC. The AC motor uses AC current to transform electrical energy into mechanical energy. There are many types of AC motor. The DC motor uses DC current to transform electrical energy into mechanical energy. The main advantage of using this is that we can control the speed and it occupies less space.

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Classification Of DC Motor

Based on the type of construction and electrical connection, DC motor can be categorised into four major types. The brief chart (based on the type of construction and electrical connection) is given below:

Types of DC Motor

Types of DC motor when listed sequentially:

  • Permanent Magnet DC Motor
  • Shunt Motor
  • Series Motor
  • Compound Motor is again classified into
  • Short Shunt Motor
  • Long Shunt Motor
  • Differentially Compound
  • Cumulative Compound

Permanent Magnet DC Motor

In these types of DC motor, the permanent magnet is used to create a magnetic field. In this, not input current is consumed for excitation. These are used in automobile starters, wipers, air conditioners, etc

Shunt DC Motor

Here, the field is connected with the armature windings in parallel or also known as a shunt. The shunt field can be separately excited from the armature windings and that is the reason it can be used for greater speed regulation and can also offer very simplified reverse control.

Series DC Motor

Here, a large wire carrying the full armature current winds the field with few turns. This kind of motor generates a large amount of starting torque but the speed cannot be regulated here. If they are run with no load then it might face damage. These are not the ideal option for variable speed applications.

Compound DC Motor

These have a shunt field which is separately excited. They have a good starting torque but might face problems in variable speed application.

Short Shunt DC Motor

In here, the shunt field winding is only connected with the armature winding and that too in parallel. The field coil, which is in series is entirely exposed to current before being split up into the armature.

Long Shunt DC Motor

In here, the shunt field winding is connected in parallel with both series field coil and armature which are again connected with each other in series.

Differentially Compound DC Motor

In this type of compound wound DC motor, the flux produced due to the shunt field windings reduces the effect of the main series windings.

Cumulative Compound DC Motor

Here, the flux produced by the shunt field windings enhances the effect of the main field flux which is produced by series winding.

Interesting Questions on DC Motor (FAQs)

Q1: What is the function of permanent magnets in Permanent magnet DC motor
Ans: Permanent magnet DC motor uses permanent magnets to create field flux.

Q2: What is a series motor?

Ans: A large wire carrying the full armature current winds the field with few turns. This kind of motor generates a large amount of starting torque but the speed cannot be regulated here.

Q3: What is the compound motor?

Ans: These have a shunt field which is separately excited. They have a good starting torque but might face problems in variable speed application.

Q4: What are the types of compound excited DC motor?

Ans: The types of compound excited DC motor are Short Shunt Motor, Long Shunt Motor, Differentially Compound, Cumulative Compound.

Q5: What are the types of self-excited DC motor?

Ans: The types of self-excited DC motors are Shunt excited, compound excited and series excited DC motor.

Hope you have got a brief knowledge of types of DC motor, along with a chart of classification. Stay tuned with BYJU’S for more such interesting articles. Also, download BYJU’S – The Learning App for loads of interactive & engaging videos and unlimited academic assist.

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