7. MOTOR SIZING AND BATTERY SIZING - B-Division-2022-2023-Odd/Repo-10 GitHub Wiki

MOTOR SIZING AND BATTERY SIZING

# ## Motor Size Principles

  • Speed: The number of revolution per minute of the motor. Usually denoted "N" and measured in rpm (revolutions per minute)

  • Torque: The force with which a motor turns is called Torque. measured in Newton-meter(N-m)

  • Mechanical Power: The mechanical output of the motor (P) measured in Watts. P=(23.142N*T)/60

Torque****calculation

                   T=F*r=F*(D/2)

T= Torque in N-M.

r=Distance between the center of rotation and force point in m.

F=Force in N.

Horizontal Force

F=umg

where

m=mass of the object

u=Coefficient of friction between two surfaces

g=Gravitational Acceleration

Dimensions

  1. Flip board

thickens=0.005m

width=0.2m

height=0.58m

v1=(twh)

=0.005*0.2*0.58

=0.00058m^3

Mass=v*density

  =0.00058*48
  
  =0.028Kg/m^3

F=m*g

 =0.028*9.8

 =0.27N

 F=u*m*g

  =0.6*0.27
  
  =0.2N

r=20cm

T=F*r

 =0.2*20

 =4Ncm

Tmax=T*1.5

   =4*1.5

   =6Ncm

T=6/9.8

=0.6Kgcm

Motor Size: 60 RPM 12V Noise DC motor with Metal gears-Grade A Battery Size:12V

  1. Flip board

thickens=0.005m

width=0.16m

height=0.29m

V=twh

=0.0050.160.29

=0.000232m^3

Mass=V*density

 =0.000232*48

 =0.011136Kg/m^3

F=M*g

=0.011136*9.8

=0.11N

F=uMg

=0.6*0.11

=0.07

r=16cm

T=F*r

=0.07*16

=1.12Kg-cm

Tmax=T*1.5

  =1.12*1.5

  =1.68Kg-cm

T=1.68/9.8

=0.17=0.2Kg-cm

Motor Size: Tower Pro MG996R

Battery Size:5V