Title page for ETD etd-04012011-015743

Type of Document Master's Thesis
Author Wang, Zhiwei
Author's Email Address zwang22@lsu.edu
URN etd-04012011-015743
Title Performance of Twin-Rotor DC Homopolar Motor
Degree Master of Science in Electrical Engineering (M.S.E.E.)
Department Electrical & Computer Engineering
Advisory Committee
Advisor Name Title
Mendrela, A.Ernest Committee Chair
Mehraeen, Shahab Committee Member
Zhou, Kemin Committee Member
  • Twin-Rotor
  • Homopolar DC motor
  • steady-state analysis
  • dynamic analysis
  • 3D modeling in ANSOFT MAXWELL
Date of Defense 2011-03-23
Availability unrestricted
A new concept of dual-rotor motor with counter-rotating propeller increases the efficiency of the ship propulsion used in marine industry. This concept can be realized by twin-rotor permanent magnet homopolar disc motor, which is the object of this thesis.

The objectives of this thesis are to determine the motor electromechanical parameters applying a 3-D FEM modeling and to analyze the motor performance in steady-state and dynamic conditions.

The objectives of this thesis are to determinate the PM DC homopolar twin-rotor disc motor electromechanical parameters by 3-D FEM modeling. Furthermore, the PM DC Homopolar perform determination in steady-state and dynamic conditions. To reach these objectives, a 3-D model of the twin-rotor type of homopolar PM DC motor is developed using Ansoft Maxwell V12 software package. From modeling the motor magnetic flux and current flow density distribution on the aluminum disc and the electromechanical parameters were determined. Next, applying the electric equivalent circuit and mechanical equivalent system, the steady-state model and dynamic motor mode was developed in Matlab/Simulink software and the performance of the homopolar motor was analyzed.

From the analysis, the following conclusions were deduced:

- To produce the relatively high electromagnetic torque a very high currents have to be supplied to the rotor aluminum discs what is the major deficiency of the motor

- The currents are distributed non-uniformly in the disc what makes the electromagnetic torque smaller. To improve this, more brushes should be applied around the disc periphery.

- The proposed construction of the motor allows one rotor disc to rotate in direction opposite to the rotation of other rotor disc. This can be done by reversing the current flow in one of the aluminum discs.

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