Week-6 Challenge: EV Drivetrain

1.There are 4 typesof coverter used AC =Alternating current and DC = Direct Current

a.AC to DC Converter

b.DC to DC converter

c.AC to DC converter

d.AC to AC converter

2. 72V battery pack

Rated Armature voltage= 72 V

Rated armature current= 400 A

Ra= 0.5Ω, KΦ= 0.7 Volt second

Chopper Switching frequency= 400 Hz

duty cycle is 70%

Tv=24.7+0.0051w^2

Tm=(v*k-k^2*w)/r where v= supply voltage,w=anguler velocity in radian, r = resistence

v=70*0.7(duty cycle)= 49V;

clc;
v=70*0.7;
k=0.7;
r=0.5;
w=[0:0.01:50];
tv=24.7+0.0051.*w.*w;
tm=(v*k-k^2*w)/r;
plot(w,tv);
xlabel('speed in radien');
ylabel('Torque in Nm');
grid on;
hold on
plot(w,tm);

fig :output of code

w =37.42

convert w to kph with radius =0.3m

Speed = 3.6*0.3*37.42=40.41~ 40kph

3. w=(V/K)-(Ra*T)/K^2;

fig outout of DC motor Equation with yellow = torque T, blue = speed w

4.In the artical written by Wally Ripple, He expalin how are DC motor are differnet form each othe and how the constructed differntly . How there usability differ from each other

AC Motor DC Brusless Motor

1. he induction rotor has no magnets – just stacked steel laminations with buried peripheral conductors that form a “shorted structure	1.brushless machines, the rotor includes two or more permanent magnets that generate a DC magnetic
2 starting torque reqired	2 no stating torque reqired
3. it workin on VFD variable frequency drive	3. it works on fixed ferquency utility power
4.magnetic losses are less	4.magnetic losses are more
5.it uses coil winding which is less expensive	5.it uses permanet magnet which expensive
6.it is used where high perfoemance needed	6.it is used in low and medium performance

conclusion

DC brushless drives will likely continue to dominate in the hybrid and coming plug-in hybrid markets, and that induction drives will likely maintain dominance for the high-performance pure electrics.

DC motor has more size/weight ration which makes it less efficient

Induction motor has less size/weight ration which makes it more efficient.