Motor and adapter sizing - R-division-2021-2022-odd/Repo-05 GitHub Wiki

1.) MOTOR SIZING :-

REQUIRED FORMULAE :-

T = M x A x D /2

where;

T= Torque

M= Mass

A= Acceleration

D= Diameter

REQUIRED INFORMATION :-

RATED RPM AT 12 V	RATED TORQUE IN Kg - Cm AT 12 V
1000	0.12
500	0.25
300	0.35
200	0.5
150	0.8
100	1.2
60	2
30	4
15	8
10	12
3.5	30

CALCULATIONS :-

F = mg Mass of the rotating plate = 50gm=0.05Kg

Diameter of the disc = 100mm=0.1m

force = 0.05x9.81=0.491N

Torque= FD/2= 0.491x0.1= 0.0491Nm

Safety factor= 1.5

Final Torque = 1.5 x 0.0491 = 0.07365Nm

as we know ; 1 Nm = 10.1971kg - cm

Therefore,

Torque in Kg-cm= 10.1971 x 0.07365 = 0.751 Kg-cm

Now, by looking at the table we'll need a 4.2 kg-cm nema stepper motor

2). Adapter sizing

Sl No.	Components	Quantity	Operating voltage	Current consumed
1	Stepper Motor	3	12V	3x400=1200mA
2	Barcode Scanner	1	5V	150mA
3	Arduino Mega2560	1	5-12V	100mA
4	IR Sensor	3	5V	3x40=120mA
5	2 Channel Relay	3	5V	3x80=240mA

12V	5V
1200mA	610mA

Applying factor of safety :-

Safety factor = 1.2

12V	5V
1440mA	732mA

We can use a 12V adapter with the current rating of 2A and a 5V adapter with the current rating of 1A .