Induction motor are also called AC electric motor and the rotating torque in the rotor is obtained due to electromagnetic induction in the rotating magnetic field of the stator winding. As they operate at speed less than synchronous speed these motor are also referred as asynchronous motor

1. COMPARATIVE STUDY OF
MULTIPHASE AND THREE PHASE
INDUCTION MOTOR
Paper presented by
Ramesh Singh, Somu Gupta , Yash Bindal, Shivangi Mishra
Electrical and Electronics Engineering
KIET Group of Institutions, Ghaziabad

2. Content
■ INTRODUCTION
■ EQUIVALENT CURCUITS
■ MOTOR SOLVE MODEL
■ MACHINE DIMENSIONS AND RATINGS
■ MOTOR WINDING AND VIEW
■ ROTATING MAGNETIC FIELD
■ TORQUE SPEED CGARACTERSTICS
■ THERMAL ANALYSIS
■ RESULT
■ CONCLUSION

3. Introduction
 Induction motor are also called AC electric motor and the rotating torque in the
rotor is obtained due to electromagnetic induction in the rotating magnetic field of
the stator winding. As they operate at speed less than synchronous speed these
motor are also referred as asynchronous motor
■ THREE PHASE INDUCTION MOTOR:-
■ It consists of a stator with stator windings and a rotor. The stator carries a 3-
phase winding while the rotor carries a short circuited rotor winding. When the
three-phase voltages are applied to the stator windings, a rotating magnetic field
is established. As the magnetic field rotates, currents are induced in the
conductors of the squirrel cage rotor. The interaction of the induced currents and
the magnetic field produces forces that cause the rotor to rotate.
■ MULTIPHASE INDUCTION MOTOR:-
■ Stator carries more than 3 phase-stator winding, working principle will be same as
that of three-phase induction machine but phases will be divided into number of
groups.

4. ■ Induction motor are being widely used in industrial applications
due to its ruggedness and simplicity.
■ In the proposed paper there is detailed comparative study of
multiphase and three phase induction motor using Motor Solve an
electrical machine design software with the help of Finite
Element Method.
■ This paper presents the torque speed and thermal analysis for
both kind of motor

5. EQUIVALENT CIRCUIT FOR
MULTIPHASE AND THREE PHASE
MACHINE
Per phase equivalent circuit for six phase
induction motor
Per phase equivalent circuit for six phase
induction motor

6. MotorSolve Model
■ MotorSolve is the complete design and analysis software for
induction, synchronous, electronically and brush-commutated
machines.

7. Machine Dimensions and
Ratings
Six phase Three phase
Voltage: 415V
Phase: 6
Frequency: 50Hz
No. of Poles: 6
Rotor slip: 5
Synchronous speed: 1000rpm
Power Rating: 4.92 HP
No. of Phase Group: 2
Air gap thickness: 0.5
Motor aspect ratio: 0.9
R1: 0.782
R2: 3.95
L1: 11.4 H
L2: 19.5 H
Voltage: 415V
Phase: 3
Frequency: 50Hz
No. of Poles: 6
Rotor slip: 5
Synchronous speed: 1000rpm
Power Rating: 4.92 HP
No. of Phase Group: 1
Air gap thickness: 0.5
Motor aspect ratio: 0.9
R1: 0.605
R2: 2.28
L1: 20.2 H
L2: 13.7 H

8. MotorSolve Stator Winding
and Motor View
Stator winding

9. Rotating Magnetic Field

10. TORQUE SPEED
CHARACTERSTICS
Max. starting Torque= 5.3 N-m
Max. Torque= 8.48 N-m
6 Phase Induction Motor 3 Phase Induction Motor

11. THERMAL ANALYSIS
■ Thermal analysis is performed here, it is observed how the
temperature varies with time and thermal losses generated in
motor.
Thermal chart for 6 phase motor Thermal chart for 3 phase motor

12. THERMAL LOSSES
Type of
losses
Loss in KW
Total 0.317
Winding 0.0822
Rotor cage 0.193
Iron 0.0411
Stator back
iron
0.0185
Stator
teeth
0.0222
Rotor back
iron
0.000249
Rotor 0.000154
1.Thermal loss for 6 phase motor
Table 2 thermal losses for 6 phase motor
Type of losses Loss in KW
Total 0.246
Winding 0.0621
Rotor cage 0.148
Iron 0.0352
Stator back
iron
0.0154
Stator teeth 0.0195
Rotor back
iron
0.000196
Rotor teeth 0.000119
thermal losses for 6 phase
motor
thermal losses for 6 phase
motor

13. RESULT
Machine Starting
torque
Maximum
torque
Thermal
losses
Efficiency
Multi-
phase
machine
High High High High
Three-
phase
machine
Low Low Low Low

14. CONCLUSION
■ Through this analysis it is obtained that six phase induction
motor with parallel tooth stator and round bar rotor type has
high efficiency along with high starting torque and large value
of maximum torque in comparative to 3 phase induction motor
which makes six phase machine best suited for traction system,
electric propulsion system in electric and hybrid vehicles,
traction system.
■ Reduction in high thermal losses in case of 6 phase can be
made by providing sufficient cooling system.

15. THANK YOU