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Electrical Machines and Controllers
DESIGN AND DEVEOPMENT OF SPECIAL ELECTRICAL MACHINES AND CONTROLLERS
Department of EEE houses a core machines group who work on design and development of electrical drives and controllers. Sensorless control techniques are implemented for special machines like Switched reluctance machine and Permanent magnet brushless dc machine with the help of analysis tools. Some specific projects like design and development of prototype of linear induction machine for CVRDE and design of rotor for axial flux machine for TVS-LUCAS have been undertaken. The Projects are executed with UG,PG and Ph.D students. Electrical department has the following facilities for design and development of Electrical machines.
(1) Computer aided design tools
A Computer aided design tools.Electromagnetic design is carried out with the help of the MAGNET6.23 and ANSYS9.0
MAGNET is low frequency electromagnetic simulation software. Static 2D/3D computes the static field in and around the specified DC current distribution and permanent magnets.
ANSYS is a finite element multi physics software which can used for design and analysis. 2D static magnetic analysis and 2D harmonic field analysis calculates the magnetic field in the Electric motors, Actuators and Power generators. Iron losses of the machine can be calculated.
Electric Circuit analysis determines the voltage and current distribution in Electric circuit due to applied source voltage and currents. Heat distribution of the machine is done by doing thermal analysis which calculates the temperature distribution and related quantities in a system or a component. CFD analysis helps to find the windage loss of the machine. Structural analysis is to find the displacements in the structure for the applied force. In order to design a quite machine the vibrations of the machine should be low Vibration analysis is accomplished by doing MODAL analysis.
(2) Analysis Control
A simulation model can be an easy-to-design tool for precise prediction of drive performances during transient and steady state operation. The simulation model of the complete drive is a combination of several functional and equation based modular blocks. Simulation, analysis and controller design can be carried out using the available softwares like MATLAB, LABVIEW, MAGNET, NASYS, PSIM
The type of analysis that can be carried out fir machines are Circuit analysis, Thermal analysis, Structural analysis, CFD analysis, Transient analysis, Static Magnetic analysis and Timeharmonic field analysis.
(3) Hardware facilities
Complete design and Development of controllers can be implemented with the help of DSPACE, DSP Kits, FGPS and NI ELVIS Axial Flux brushless DC motor for electric vehicles
The induction motor drives were preferred for EV propulsion due to their low cost, high reliability, high speed, established converter and manufacturing technology, low torque ripple/noise and absence of position sensors. However PMBLDC motor featured compactness, low weight, and high efficiency and therefore provided an alternative for EV propulsion. Several PM motors have been developed for EVs to fulfil the special requirements such as high power density, high efficiency, high starting torque and high arising speed. These motors can be classified as indirect driven and direct driven motors. The direct driven motors are called wheel motors or built-in-motors, are directly mounted inside the wheel, thus eliminating the transmission gears or mechanical differentials with their associated energy loss. The reduction of mechanical components in transmission chain of gears not only improves the overall efficiency but also reduces the overall weight of the vehicle.
In the class of direct driven motors the axial flux motor competes the redial flux motor with some advantages such as balanced motor stator attractive force, better heat removal configuration, no rotor back iron and adjustable air gap.