Basic Electronics and Electrical Engineering: Chapter 2: DC Machines
Types of DC Motors
The DC motors are classified into three types based on the field winding connection with the armature 1. DC Shunt Motor 2. DC Series Motor 3. DC Compound Motor (i) Long shunt compound motor (ii) Short shunt compound motor
TYPES
OF DC MOTORS
The DC motors are
classified into three types based on the field winding connection with the
armature
1.
DC Shunt Motor
2.
DC Series Motor
3.
DC Compound Motor
(i)
Long shunt compound motor
(ii)
Short shunt compound motor
1. DC Shunt Motor
In DC shunt motor, the
field winding is connected in parallel with the armature as shown in Fig. 2.31.
The field winding has a large number of turns and relatively smaller cross
sectional area. Therefore the shunt field winding have high resistance and
hence shunt field current is relatively small compared with armature current.
The relationship
between V, Eb and la is given below
V = Eb+ laRa
Ia = IL ‒ Ish
Ish = V / Rsh
2. DC Series Motor
In DC series motor, the
field winding is connected in series with the armature as shown in Fig. 2.32.
The series field winding carries the input current. (IL=Ia+Ise).
The series field winding has a relatively small number of turns of thick wire
and, therefore will posses a low resistance.
The relationship
between V, Eb and Ia is given below.
V = Eb + IaRa +
IaRse
V = Eb + Ia(Ra
+ Rse)
V = Supply Voltage
IL = Ia
= Armature current
Rse = Resistance
of series field
Ra =
Resistance of Armature
Eb = Back
emf induced
3. DC Compound Motor
In compound motors,
both series field and shunt field windings are connected with the armature.
1. Short Shunt Compound Motor
In short shunt compound
motor, the series field winding is connected in series with the parallel
combination of armature and shunt field winding.
The relationship
between V, Eb and Ia is given by,
V = Eb + ILRse
+ IaRa
Vsh = V ‒ ILRse
Ise = IL
IL = Ia
+ Ish
Ish = Vsh / Rsh
2. Long shunt compound motor
In long shunt compound
motor, the shunt field winding is connected in parallel with the series
combination of series field winding and armature.
The relationship
between V, Eb and Ia is given below:
V = Eb + Ia(Ra+Rse)
Ia = Ise
IL = la
+ Ish
Basic Electronics and Electrical Engineering: Chapter 2: DC Machines : Tag: : - Types of DC Motors
Basic Electronics and Electrical Engineering: Chapter 2: DC Machines
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