| DC Motor Characteristics | Using MATLAB |

1.

Where,

T = Torque of the motor (N-m)

V = Total Voltage (v)

k = Motor Constant (volt*Sec./rad.)

R = Resistance (ohms)

w = Omega (rad./sec.)

MATLAB Script :

clear all
close all
clc

v = input('Enter voltage value(volts)= ');%volts
r = input('Enter resistance value (ohms)=');% ohms
k = input('Enter the value of Motor Constant = ');%volt sec./rad.
 
w_max = v/k   %at T = 0 , w in rad./sec.
T_max = (v*k)/r  %at w = 0 , t in N-m
operating_T = linspace(0,T_max,2000);

for i = 1:length(operating_T)
    w(i) = (v/k)-(operating_T(i)*r)/k^2;
    w_rpm(i) = (w(i)*60)/(2*pi);
end 
plot(operating_T,w_rpm);
xlabel('Torque(N-m)')
ylabel('Angular Speed(rpm)')

Taking,

Inputs as:

Output :

2.

3.

The High voltage of the battery is considered when our Battery pack is fully charged or our voltage is at max. Whereas, low voltage of the battery is considered when the battery is been depleted after using the motor and other accessories.

NOTE: This voltage drop is generally seen in Lead-acid batteries.