Can you increase the supply voltage to a value higher than the back EMF?

Thanks, @Ricardo Erckert.

No, if I can not increase the voltage after a point. I have applied the maximum possible.

if I increase the voltage the power will increase which is not preferred.

Thanks for your response, Dr. Mohamed N. Ibrahim

I have tried the variations in commutation angle which is effected in unaligned position but in the increasing inductance zone, the current is not reaching the desired limit at which the hysteresis is to be applied.

As of my knowledge, increasing the voltage will bring the current level to low. (Means Pin=V*I) and turn on and off (conduction angle) will control the average torque, efficiency and torque ripples.. Also, use peak current for excitation. (min of 1.5* of average current).

You can use higher phases voltage level on two conditions:

1) The turn-to-turn insulation withstands the voltage level.

2) The switching frequency of hysteresis current control doesn't exceed the limit of dv/dt of turn-to-turn insulation. Otherwise, high value of dv/dt will cause the insulation to breakdown.

In my opinion, this is the only solution. If you can't use higher phases voltage level and you still in the design process, you can use wires designed for high switching frequency.