# 5 Types of DC Motors | Series, Shunt, and Compound

- Link: https://studyelectrical.com/2014/12/types-of-dc-motors.html
- Published: 2014-12-27T13:05:00+00:00
- Author: 

Like DC generators, there are different types of DC motors characterized by the 
connections of the field winding in relation to the armature. They are

 1. **Shunt Wound DC Motor**
 2. **Series Wound DC Motor**
 3. **Compound Wound DC Motor**
 4.  a. **Short Shunt Connection**
     b. **Long Shunt Connection**
 5. **Permanent Magnet DC Motor**
 6. **Separately Excited DC Motor**

### Shunt Wound DC Motor

A shunt-wound motor is a type of dc motor in which the field winding is connected
in parallel with the armature.

[⌊DC Shunt Motor⌉⌊DC Shunt Motor⌉[

DC Shunt Motor

The current through the shunt field winding is not the same as the armature current.
Shunt field windings are designed to produce the necessary m.m.f. by means of a 
relatively large number of turns of wire having high resistance.

Therefore, the shunt field current is relatively small compared with the armature
current.

### Series Wound DC Motor

A series-wound DC motor is one type of dc motor in which the field winding is connected
in series with the armature.

[⌊DC Series motor⌉⌊DC Series motor⌉[

DC Series motor

Therefore, the series field winding carries the armature current. Since the current
passing through a series field winding is the same as the armature current, series
field windings must be designed with much fewer turns than shunt field windings 
for the same m.m.f.

Therefore, a series field winding has a relatively small number of turns of thick
wire and, therefore, will possess a low resistance.

### Compound Wound DC Motor

The compound-wound DC motor which has two field windings:

 * One winding is connected in parallel with the armature
 * The other winding is connected in series with it.

There are two types of compound motor connections (like generators).

 1. Short Shunt Connection
 2. Long Shunt Connection

#### 1. Short Shunt Compound DC Motor

[⌊Short Shunt Compound DC Motor⌉⌊Short Shunt Compound DC Motor⌉[

Short Shunt Compound DC Motor

When the shunt field winding is directly connected across the armature terminals,
it is called a short-shunt connection.

#### 2. Long Shunt Compound DC Motor

[⌊Long Shunt Compound DC Motor⌉⌊Long Shunt Compound DC Motor⌉[

Long Shunt Compound DC Motor

When the shunt winding is so connected that it shunts the series combination of 
armature and series field, it is called a long-shunt connection.

The compound machines (generators or motors) are always designed so that the flux
produced by shunt field winding is considerably larger than the flux produced by
the series field winding. Therefore, the shunt field in compound machines is the
basic dominant factor in the production of the magnetic field in the machine.

### Permanent Magnet (PMDC) motors

The stator is a permanent magnet, so the motor is smaller in size.

A disadvantage is these motors are only used for low torque applications.

### Separately Excited motor

The rotor and stator are each connected from a different power supply.

This gives another degree of freedom for controlling the motor over the shunt.

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