The sample machine has been fabricated with 110N-m ....
When a Permanent Magnet machines is to be designed, its Torque is increased by reducing leakage flux with proper design of of its slots.Cogging is the main problem for Permanent Magnet machines which is to be minimized by minimizing airgap permeance.
Thank you Professor Rao for your support, the minimization can be possible.... any possibility to increase the torque
The maximum torque is inversely proportional to the D-axis synchronous inductance. If you are able to make the air gap longer or reduce the number of turns you can decrease the D-axis synchronous inductance value. Reducing the stator leakage helps also a bit. Another alternative is to drive the machine with increased voltage (if there is room for extra flux in the magnetic circuit and efficient enough cooling).
Thanks Prof. Janne Nerg for your feedback, we have opted for higher torque machine with next capacity ..... reason being some constraints ....
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