I am designing a three phase induction motor(IM) for a required Max. Torque - Speed characteristics (with field weakening upto 18000 rpm). The Knee point from the characteristics is 60 Nm and 4500 rpm which gives a max power of 28 kW . The outer dimensions of the motor is fixed to 140 mm. How is it possible to achieve such a high max. torque with this outer dimension? Also i have read from articles that by decreasing the stray factor of IM, BD torque can be increased to very high values. How can i achieve a low stray factor by changing the geometries of stator and rotor?
If we decrease the stator and rotor leakage reactances, the max. torque will increase. How to decrease, the leakage reactance? This may be achieved by increasing the slot opening (width) and decreasing the slot depth. Also, decreasing the airgap length will decrease the leakage reactance.
Thank you both. I could increase the Break down torque to some extent with your suggestions but restricted by the tooth flux density. I am using Maxwell software for motor design. But what i observed is increasing the length of the machine has an adverse effect on the Max. torque. Is it because of increased Stator resistance?
I think that increasing the motor length will increase the stator leakage reactance, the rotor leakage reactance and the magnetizing reactance. This in addition to the increase of the stator resistance will result in decrease of the max. torque.
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