# Worm gear calculation

Dear all,
I am trying to build single axis solar tracker using worm gear, I need guide line for calculation of worm gear & stepper motor .he are some relation i taken, But i wanted whether its correct & need to explain with example

efficiency= (output Power of Worm gear/ Input Power of WormGear) = Po/Pinput

Output power =P0=(2*pi*Outputspeed*outputtorque)/60

Output power in Kw
Output speed in rev/min
output torque in Nm

Input power = Pinput=(2*pi*Input speed*Input torque)/60

Input power in Kw
Input speed in rev/min
Input torque in Nm

Net Torque= Toutput+TInput+Tholding =0

These are basic equation followed usually

In order to drive 250Kw plant ; assume 15kw per row I have 16 rows with 1 column.

Worm gear has to Drive 16 rows with coupling with single column item

each panel weighs 20Kg ; 60 panel per row-> 60*20kg=1200Kg
Each row structural weight around = 700Kg

Net weight alone = 1900Kg per Row

so load on worm gear might be 1900*16=30400

worm gear relation part:

if torque(high) gear ratio(high) speed o/p(LOW) vice versa

There are lot of parameter in case of worm gear which are given below as example:
1 st Stage Ratio of Worm Gear: 1/10
2 nd Stage Ratio of Worm Gear:1/73
Rated Output Speed: 0.078rpm
Rated Output torque: 910 Nm
output torque :1300Nm
holding torque :10.4Knmt
o/p speed : 56.9rpm

In case of motor i consider the motor as
https://www.anaheimautomation.com/products/stepper/stepper-motor-item.php?sID=24&pt=i&tID=75&cID=19

how can use these sample for calculation. can some help me out here.