Motor Selection

DriveCycle=readmatrix(‘FUDS.xlsx’);

t=DriveCycle(:,1);

v_mph=DriveCycle(:,2);

v_kmph=v_mph*1.609;

v_mps=v_kmph*5/18;

d_m(1)=0;

a_mpss(1)=v_mps(2)-v_mps(1);

for k=2:(length(t)-1)

d_m(k)=d_m(k-1)+v_mps(k);

a_mpss(k)=v_mps(k+1)-v_mps(k);

end

d_m(length(t))=d_m(length(t)-1)+v_mps(length(t));

d_m=(d_m)’;

a_mpss(length(t))= -v_mps(length(t));

a_mpss=(a_mpss)’;

d_km=(d_m/1000)’;

figure(1);

subplot(3,1,1);

plot(t,v_kmph);

xlabel(‘time (s)’);

ylabel(‘speed (kmph)’);

title([‘Max Velocity :’,num2str(max(v_kmph)),’ km/hr’]);

subplot(3,1,2);

plot(t,a_mpss);

xlabel(‘time (s)’);

ylabel(‘accleration (m/s^2)’);

title([‘Max Accleration :’,num2str(max(a_mpss)),’m/s^2′]);

subplot(3,1,3);

plot(t,d_km);

xlabel(‘time (s)’);

ylabel(‘distance (km)’);

title([‘Distance travelled :’,num2str(max(d_km)),’km’]);

mass=180;

Cd=1;

F_a=0.6;

Urr=0.015;

Tr=0.28;

gr=2;

m_eff=0.8;

t_eff=0.95;

roh=1.225;

g=9.821;

P_accessories = 50*ones(length(t));

P_accessories=P_accessories(:,1);

tyre_radps=v_mps/Tr;

motor_radps=tyre_radps*gr;

motor_rpm=motor_radps*60/(2*pi);

F_inertia =transpose(mass*a_mpss);

F_rr= Urr*mass*g*ones(length(t));

F_rr=F_rr(:,1);

F_aero=0.5*roh*Cd*F_a*v_mps.^2;

F_traction=F_inertia+F_rr+F_aero;

T_tyre=F_traction.*Tr;

T_motor=T_tyre/(gr*t_eff);

P_motor=motor_radps.*T_motor;

figure(2)

subplot(3,1,1);

plot(t,P_motor);

xlabel(‘time (s)’);

ylabel(‘motor power (watt)’);

title([‘Max Power :’,num2str(max(P_motor)),’ watt’]);

subplot(3,1,2);

plot(t,motor_rpm);

xlabel(‘time (s)’);

ylabel(‘motor speed (rpm)’);

title([‘Max speed :’,num2str(max(motor_rpm)),’rpm’]);

subplot(3,1,3);

plot(t,T_motor);

xlabel(‘time (s)’);

ylabel(‘motor torque (watt)’);

title([‘Max torque :’,num2str(max(T_motor)),’ N/m’]);

P_total=(P_motor/m_eff) + P_accessories;

energy(1)=0;

for k=2:length(t)

energy(k)=energy(k-1)+P_total(k);

end

energy=energy*2.778e-7;

figure(3)

plot(t,energy);

xlabel(‘time (s)’);

ylabel(‘energy (kWh)’);

title([‘Enrgy consumed :’,num2str(max(energy)),’ kWh’]);

June 21, 2022

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