2. In a three phase brushless DC (BLDC) motor drive system k, (back-EMI F consta

Question

2. In a three phase brushless DC (BLDC) motor drive system k, (back-EMI F constant)-k, Ti (load torque) -3 (Nm) = 1, J(total inertia)= 0.1 Calculate the required motor torque, T, (constant torque from 0 to 2 second) to accelerate the motor speed (o,) from 0 to 300 (rad/sec) during 1 second (at t1 sec, speed is 300 rad/sec). lignore friction (B-0) Also, from the obtained motor torque, calculate the required each phase current magnitude (positive portion magnitude). -assume the square current waveforms as below , #2

Explanation / Answer

Given data:-

J=0.1

Tl=3Nm

Motor speed Wr=300 rad/sec

t=1 sec

Required motor torque=Tl + J(dWm/dt)

dWm/dt=300/1=300

Required torque=3 + 0.1(300)=33N

Te=33N

Phase current I=Te/K

=33/1=33A

I=33A

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