Trying to calculate motor kW/reduction drive for lift of 100kg at 0.8m /sec

  • Thread starter Thread starter surfguy
  • Start date Start date
  • Tags Tags
    Calculation Motor
AI Thread Summary
To calculate the motor size needed to lift a 100kg weight at a speed of 0.8 m/s, first determine the required power, which is approximately 784 watts or 1 HP. The gear reduction ratio and drum diameter are crucial for this calculation, as they directly influence the motor RPM and cable speed. A common approach is to select a motor RPM and reasonable drum size, then adjust the gear reduction accordingly. For example, with a 1750 RPM motor and a 10:1 gear reduction, the drum diameter would need to be about 8.7 cm to achieve the desired cable velocity. Accurate calculations are essential for selecting the appropriate motor and gearbox combination.
surfguy
Messages
1
Reaction score
0
TL;DR Summary
need to calculate motor kw/reduction drive for lift of 100kg at .8mtrs /sec
Hi
need to calculate 240v/315v motor size attached to reduction gearbox (reduction unknown) to lift a weight of 100kg on cable drum .8mtr/sec.
Drum dia not determined yet.
motor size not determined yet.
any help is greatly appreciated as this seems to be out of depth of many motor drum winch suppliers and myself.
thanks
 
Engineering news on Phys.org
Welcome to PF.

What is the application? How far do you have to lift it?
 
Single or 3 phase?

Step 1: calculate the power you need, then double it.

Step 2: pick a common motor rpm and "reasonable" drum size, then calculate the reduction. Adjust as seems appropriate.
 
Ignoring acceleration.
The change in PE per second = m·g·h = 100 * 9.8 * 0.8 = 784 watt ≈ 1 HP.
 
Finally, the gear reduction ##GR##, drum diameter ##d## (in meters), and motor ##RPM## are linked in the following way:
$$v = \frac{\pi}{60} \times d \times \frac{RPM}{GR}$$
Or
$$d = \frac{19.1 \times GR \times v}{RPM}$$
Where ##v## is the cable speed in meters per second. For example, given a motor of 1750 RPM and a gear reduction of 10:1, the drum diameter would be 0.087 meters or 8.7 cm to get a cable velocity of 0.8 m/s.
 
Posted June 2024 - 15 years after starting this class. I have learned a whole lot. To get to the short course on making your stock car, late model, hobby stock E-mod handle, look at the index below. Read all posts on Roll Center, Jacking effect and Why does car drive straight to the wall when I gas it? Also read You really have two race cars. This will cover 90% of problems you have. Simply put, the car pushes going in and is loose coming out. You do not have enuff downforce on the right...
Carburetor CFM A Holley Carb rated at 500 cfm 2 barrel carb has venturi diameter of 1.3/8". There are 2 barrel carbs with 600 cfm and have 1.45 diameter venturi. Looking at the area the 1.378 bore has 5.9 sq. Inch area. The 1.45 dia. has 6.6 sq. inch. 5.9 - 6.6 = 0.70 sq. inch difference. Keeping the 500 cfm carb in place, if I can introduce 0.7 sq inch more area in the intake manifold, will I have the same potential horsepower as a 600 cfm carb provide? Assume I can change jetting to...
I'm trying to decide what size and type of galvanized steel I need for 2 cantilever extensions. The cantilever is 5 ft. The space between the two cantilever arms is a 17 ft Gap the center 7 ft of the 17 ft Gap we'll need to Bear approximately 17,000 lb spread evenly from the front of the cantilever to the back of the cantilever over 5 ft. I will put support beams across these cantilever arms to support the load evenly
Back
Top