International Journal of Electrical
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ISSN 0976 – 6545(Print),
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ISSN 0976 – 6553(Online) Volume 5, Issue 9, September (2014), pp. 39-44 © IAEME
TECHNOLOGY (IJEET)
ISSN 0976 – 6545(Print)
ISSN 0976 – 6553(Online)
Volume 5, Issue 9, September (2014), pp. 39-44
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IJEET
©IAEME
OPTIMIZED DESIGN OF SUBMERSIBLE INDUCTION MOTOR USING
MAXWELL 16.0 RMXPRT
Amruta Deshmukh1,
1,2
A. A. Bhole2
Electrical Department, Govt. College of Engineering, Aurangabad, MH, INDIA
ABSTRACT
This paper presents the design of new stator slot in order to increase the overall performance
of the submersible induction motor using Rotational Machine Expert (Rmxprt) software package.
Using the package of Rmxprt this study is the optimal design of efficiency & torque in terms of core
material, magnetic field, stator & rotor winding, etc based on two different stator slots of same
submersible induction motor.
The existing motor 3-phase, 7.5 KW, 380 V, 4-pole is compared with the two different stator
slots from results of Rotational Machine Expert (Rmxprt).This study gives the new design of stator
slots with improved efficiency and torque of the existing motor.
Keywords: Electric Machines, Magnetizing Current, Optimum Design, Rotational Machine, Stator
Slot and Submersible Induction Motor.
INTRODUCTION
The submersible induction motor is a sort of induction motor widely used in domestic and
agricultural applications. It has poor starting torque performance, because its rotating magnetic field
in air gap is oval in shape. Currently, the optimization work on the submersible induction motor
focus on the improvement of its starting performance. Three-phase submersible induction motors are
often used because of their low cost, relatively simple manufacturing and robust construction. This
paper presents the change in stator slots configuration on efficiency of a submersible induction
motor. Consequently minimize the electrical energy consumption of a 3-Phase Submersible
Induction Motor, many optimization techniques have been used and suggested in the published
literature. The corresponding objective function is generally employed for an economic
manufacturing of motors. In past efficiency and consumed electrical energy are very much
important.
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International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print),
ISSN 0976 – 6553(Online) Volume 5, Issue 9, September (2014), pp. 39-44 © IAEME
The comparison of Submersible Induction Motor with two different stator slot shapes is done
on the submersible induction motor of 3-phase, 7.5 KW, 380 V, 4 poles. A 7.5 KW Submersible
Induction Motor, having specifications shown in Table 1, has been chosen for comparison with two
different stator slot shapes. The basic specifications of these designs are similar and the same
attributes are evaluated upon the design process. ANSOFT Corporation provides the design package
software namely RMxprt, which has been used specifically to determine the optimum stator slot
shape, which consumes less magnetizing current. The performance characteristics of the submersible
induction motor with two different stator slots have been plotted for comparison. The proposed stator
slot shape is more advantageous in respect of magnetizing current, % Efficiency, Starting Current,
Power Factor, Torque and Output Power.
MATERIALS AND METHODS
Using RMxprt, a 3-phase Submersible Induction Motor of specification has been chosen with
the as shown in Table 1. All parameters like stator dimensions, rotor dimensions and winding details,
core size, type of load, etc remaining the same, the motor has been simulated with two different
stator slot shapes. One of these types is considered as existing type and the other with new stator
slots is called as the proposed type. The results evaluated from the iterations with Rotational
Machine Expert (RMxprt) software, with the objective of improve the efficiency with minimizing the
magnetizing current.
Table 1: Motor specification
Parameter
Value
Output power(Po)
7.5KW
Rated voltage(V)
Winding connection
Number of poles(P)
Rated speed
Frequency
Type of load
Operating Temperature
Inner diameter of the
stator
Outer diameter of the
stator
Length of stator core
Outer diameter of the
rotor
Inner diameter of the rotor
End ring width
End ring Length
End ring Height
No.of stator slot
No. of rotor slot
Conductors per slot
40
380V
Star
4
1444
50Hz
Constant power
750
148mm
210mm
250mm
147.3mm
48mm
10-12mm
24
44
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International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print),
ISSN 0976 – 6553(Online) Volume 5, Issue 9, September (2014), pp. 39-44 © IAEME
Stator slot configurations
Existing slot: The dimensions of the existing slots of existing motor which are of TYPE 2 shape in
Rotational Machine Expert (Rmxprt) software are as shown in Fig. 1
Table 2: Dimensions of existing slot stator slot Values (mm)
Dimension of stator slot
Values (mm)
0.8
HS0
HS1
1.05
HS2
12.9
BS0
2.8
BS1
4.9
BS2
6.7
Proposed slot: The dimensions of the new proposed stator slots are chosen of TYPE 4 shape in
Rotational Machine Expert (Rmxprt) software are as shown in Fig. 1.
Table 3: Dimensions of proposed stator slot Values (mm)
Dimension of stator slot
HS0
Values (mm)
1
HS1
-
HS2
6.3
BS0
4
BS1
5.1
BS2
6.8
Rs
1
Stator slot configurations
Existing slot: The dimensions the existing slots of TYPE 2 are shown in table 2 and the shape is
shown in Fig. 1.
Fig. 1: Shape of the existing slot
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International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print),
ISSN 0976 – 6553(Online) Volume 5, Issue 9, September (2014), pp. 39-44 © IAEME
Proposed slot: The dimensions of the proposed slots of TYPE 4 are as shown in table 3 and the
corresponding shape is shown in Fig. 2.
Fig. 2: Shape of the proposed slot
Stamping material M19_24G steel has been selected due to its low iron loss values and
higher flux density. RMxprt shows both the existing slot and the proposed slot in figure 3. Keeping
the shape and the number of rotor slots same for both the type existing and proposed motor with
change in stator stampings for both the slots; the Induction Motor assembly has been structured. The
assemblies of both the types of motors are shown in Fig. 4.
(a)
(b)
Fig. 3: (a) Stamping of the Existing Slot; (b) Stamping of the Proposed Slot
(a)
(b)
Fig. 4: (a) Motor Assembly of the Existing Slot; (b) Motor Assembly of the Proposed Slot
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International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print),
ISSN 0976 – 6553(Online) Volume 5, Issue 9, September (2014), pp. 39-44 © IAEME
RESULT
From the performance curves of the Rmxprt results of different attributes are compared as
shown in table 4. Following results have been made from Table 4:
The new design is resulted in a lower magnetizing current, higher efficiency, good operating
power factor and constant speed, with overall efficiency more than that of existing one & with good
discharge rate.
Table 4: Performance Comparison of Motor with two different slot shapes
Attributes
Motor with existing slot Motor with proposed slot
(double layer winding)
(Fractional pitch
winding)
% Efficiency
87.08%
89.13%
Starting Current
Power Factor
Torque
Output Power
46.86 Amp
104.38Amp
0.81
0.96
69.42Nm
146.21Nm
9.9
17.50
DISCUSSION
The new proposed stator slot gives less magnetizing current & magnetizing reactance as
compared to the existing one. This resulted in improvement of power factor with more discharge rate
and efficiency of pump output. The iron and copper losses in the proposed motor are reduced
considerably. The volume of the winding material and quantity of copper is also reduced.
Efficiency curve
CONCLUSION
The proposed stator slot dimension is suitable for more efficiency, less magnetizing current
and good power factor. This design modification needs no complex manufacturing process and does
not require much cost.
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International Journal of Electrical Engineering and Technology (IJEET), ISSN 0976 – 6545(Print),
ISSN 0976 – 6553(Online) Volume 5, Issue 9, September (2014), pp. 39-44 © IAEME
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