1. Design of Permanent Magnet Electrically
Submersible Motor with Higher Fault
Tolerance Capacity
Ashraf AlShemary and Kaisar R. Khan
McNeese State University
Lake Charles, LA 70605

2. AcknowledgementAcknowledgement
• Julio Pimentel, Kylowave Inc, Ottawa., Canada
• Dr. Mohammed Youssef, University of Ontario Institute of
Technology, Canada
• Dr. M. Aghili, McNeese State University, Lake Charles, LA

3. Outline
• Introduction
• Mathematical Model for Permanent Magnet Motors
• Simulation of Three Phase BLDC Motor
• Multiphase Permanent Magnet Motor Analysis
• Proposed Testing Setup for Driving Submersible Pump
• Conclusion

4. Submersible Permanent Magnet MotorSubmersible Permanent Magnet Motor
• The electrical submersible pump, typically called an ESP, is an
efficient and reliable artificial-lift method for lifting moderate to
high volumes of fluids such as water, oil, injection fluid etc.
from well. Submersible pumps push fluid to the surface as
opposed to jet pumps having to pull fluids.
• Motor driving the pump requires high reliability and smooth
maintenance free operation.
• Multiphase permanent magnet motors are good candidate for
these purpose.
• Typical application in ranges from irrigation to oil and gas
industries.

5. Motivation of the WorkMotivation of the Work
• Because of the ESP’s unique application requirement such as
they placed deep and having relatively small-bore casings,
designer are required to maximize the lift of the pump and the
power output of the motor. Costly pulling operations and lost
production occur when correcting downhole failures, especially
in an offshore environment. Long life of ESP equipment is
required to keep production economical. A motor with high fault
tolerance capacity is desirable for this application.

6. Proposed Motor DesignProposed Motor Design
• A fractional slot permanent magnet (PM) machine with modular
structure is proposed and implemented.
• The prototype PM machine drive system achieves fault
tolerant features under single or multiple phase winding open
with decent machine power density and efficiency even during
fault operation modes.
• A novel PM machine drive system based on modular design
principles is proposed with the features of fault tolerant
capability and reasonable power density.
• The standard drive topology and control will be applied for the
system operation under healthy and fault modes.

7. Outline
• Introduction
• Mathematical Model for Permanent Magnet Motors
• Simulation of Three Phase BLDC Motor
• Multiphase Permanent Magnet Motor Analysis
• Proposed Testing Setup for Driving Submersible Pump
• Conclusion

8. Salient Pole Motor ModelSalient Pole Motor Model
For the salient-pole rotor machine, usually
two such additional windings are used, one
on the d-axis (kd) and the other on the q-axis
(kq). Damper windings in the equivalent
machine can be used to represent the
damping effects of eddy currents in the solid
iron portion of the rotor poles.
•With the reference-frame transformation,
the mathematical modeling of PMM can be
shown as:
dt
d
ir
dt
d
ir
dt
d
irv
dt
d
dt
d
irv
dt
d
dt
d
irv
kq
kqkq
kd
kdkd
s
r
d
q
qsq
r
q
d
dsd
λ
λ
λ
θλ
λ
θλλ
′
+′′=
′
+′′=
+=
++=
−+=
0
0
0
00

9. Equivalent q-d-0 circuits of a PMM
ededqqqsq
qeqdddsd
iLi
dt
d
Lirv
iLi
dt
d
Lirv
λωω
ω
+++=
−+=
( )( ) )(
2
3
2
3
2
3
)(
2
3
22
dqqde
d
d
q
qdqs
ddqqin
ii
dt
d
i
dt
d
iiir
ivivP
λλω
λλ
−+





+++=
+=
[ ]qdqdqm
dqqd
r
em
em
iiLLip
iip
P
T
)(
2
3
)(
2
3
−+=
−==
λ
λλ
ω

10. Outline
• Introduction
• Mathematical Model for Permanent Magnet Motors
• Simulation of Three Phase BLDC Motor
• Multiphase Permanent Magnet Motor Analysis
• Proposed Testing Setup for Driving Submersible Pump
• Conclusion

11. Geometric Design for Three Phase BLDC:Geometric Design for Three Phase BLDC:
Magnetic flux density, MeshMagnetic flux density, Mesh
Youssef, M.Z,” Design and Performance of a Cost-Effective BLDC Drive for Water Pump
Application

12. Geometric Design for Three Phase BLDCGeometric Design for Three Phase BLDC

13. Graphical Result for Three Phase BLDC:Graphical Result for Three Phase BLDC:
Phase Voltage and Flux Vs PositionPhase Voltage and Flux Vs Position

14. Outline
• Introduction
• Mathematical Model for Permanent Magnet Motors
• Simulation of Three Phase BLDC Motor
• Multiphase Permanent Magnet Motor Analysis
• Proposed Testing Setup for Driving Submersible Pump
• Conclusion

15. Geometric Design of Multiphase PM:Geometric Design of Multiphase PM:
Mesh and Potential MagneticMesh and Potential Magnetic

16. Geometric Design of Multiphase PM:Geometric Design of Multiphase PM:
Magnetic flux density and Current densityMagnetic flux density and Current density

17. Mesh Vs Current DensityMesh Vs Current Density

18. Potential Magnetic Field Vs Current DensityPotential Magnetic Field Vs Current Density

19. Potential Magnetic Field Vs Current DensityPotential Magnetic Field Vs Current Density

20. Magnetic Flux Density Vs Current DensityMagnetic Flux Density Vs Current Density

21. Result for Multiphase PM:Result for Multiphase PM:
Phase Current and Voltage Vs PositionPhase Current and Voltage Vs Position

22. Outline
• Introduction
• Mathematical Model for Permanent Magnet Motors
• Simulation of Three Phase BLDC Motor
• Multiphase Permanent Magnet Motor Analysis
• Proposed Testing Setup for Driving Submersible Pump
• Conclusion

23. Proposed Testing Method for EfficiencyProposed Testing Method for Efficiency
Evaluation of Motors Driving ESPEvaluation of Motors Driving ESP
• First driving regular pumps and ESP using off the shelf
component with our custom made driver (collaborating with
keylowave Inc.)
• Find the maximum efficiency point to determine the design
parameters such as Torque, Optimum speed etc. of the
permanent magnet motor for ESP driver.
• Similar testing methodology will be used in the future to test
the fabricated motor.

24. Pump and Drive SetupPump and Drive Setup

25. No Load Torque-Speed CharacteristicsNo Load Torque-Speed Characteristics
Supplied by the ManufacturerSupplied by the Manufacturer
Source:www.anaheimautomation.com/manuals/brushless/L010350%20%20BLY34%20S

26. Controller to Drive MotorController to Drive Motor
Data Acquisition System

27. Outline
• Introduction
• Mathematical Model for Permanent Magnet Motors
• Simulation of Three Phase BLDC Motor
• Multiphase Permanent Magnet Motor Analysis
• Proposed Testing Setup for Driving Submersible Pump
• Conclusion

28. ConclusionsConclusions
• We have modeled the permanent magnet motor with multiple
phase motor
• We compare simulation results for multi phase with standard
three phase motors
• Set up has been made to measure and test motor efficiency
while driving submersible pump
• Simulation results will be matched with measurement to find
out the optimum parameters of the motor which will be
fabricate in the near future.