How much power motor I need to rotate big ferris wheel

In summary: Ferris wheel with a given speed. You can do this by using the formula t = mv2, where t is torque, m is the mass of the object being accelerated, and v is the speed of the object. The mass will be distributed evenly around the circumference of the wheel, but the speed will be greater at the top of the wheel than the bottom. Additionally, wind speed will have to be taken into account.
  • #1
shaks
26
0
Hi Guys,

I am pleased to join this forum to learn something from experienced guys and thanks in advance for helping me to understand physics.

I am trying to design a Ferris wheel with maximum SPEED and maximum PASSENGER capacity. I want to know formula to calculate MOTOR POWER IN KW to rotate that Ferris wheel. Here are general specs of the wheel.

Diameter: 106 Meter
Radius: 53

Wheel total weight: 1000 Ton
Exclude Wheel standing structure: 30%
Rotating Wheel weight: 700 ton (Everything including spindle, hub, bearing, spoke cables, rim, cabin, riders weight, etc)
Minutes Per Round: 10 (1 round completed in 10 minutes)
Round Per Minute: 0.10
Wheel Speed: .55 meter per second

For this calculation if only rim, spoke cables, cabin/rider weight is required then you can make rough estimate what might be the weight of spindle, hub, bearing, etc. which are creating force. You can make an assumption and then calculate on that assumption. I will fix formula in Excel as per given here and then adjust weight.

I want to know
1. What is total torque generated by wheel (Newton Meters / Joules)
2. What power motor in HP or KW I needed to rotate this wheel

Once I get formula then I can set that formula in Excel and try to change speed to find good results.

Please help me.

Thanks

Shaks
 
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  • #2
Why are you doing this calculation? Is it a schoolwork project, or do you have a real application?

Will the riders be distributed evenly around the wheel or might they all be on one side?
How will you allow for wind speed being greater at the top of the wheel than the bottom?
 
  • #3
Thank you for helping me.

This is the calculation of real project.

Yes, rider cabin will be distributed evenly. I don' have idea of wind speed. You can assume that wind is normal. First I need to complete calculation if every thing is normal.

Thank you
 
  • #4
The answers from this thread apply to your question. But there is probably some more tedious details to look at for your project that require a high level of expertise (after all, you are basically making a building that can move!)

A quick number might be obtained from this project as the weight and sizes are very similar to your project. Although I have no clue how they got their numbers.
 
  • #5
The weight of the wheel does not alone tell you how much torque you need to accelerate it at a given rate. It also depends on how the mass is distributed inside its circumference. If most mass is located close to its circumference, you need more torque to start the wheel turning than if most of the mass is located closer to the hub. Because the acceleration closer to the circumference is greater than closer to the hub.
Also have in mind that some people tend to change their mind and do not join the ride, and there will probably be some uneven distribution of people.
In a worst case scenario, there is people only on one side of the wheel. If it between close to the top and close to the bottom is as much as 100 people with average weight of 75kg each, you will at 53 meter radius have to fight a torque of 2.7 million Nm - if my calculations are correct.

Vidar
 
Last edited:

Related to How much power motor I need to rotate big ferris wheel

1. How is the power of a motor determined for a big ferris wheel?

The power of a motor for a big ferris wheel is determined by several factors, including the weight of the ferris wheel, the number of people it can hold, and the speed at which it rotates. These factors are used to calculate the torque required to rotate the ferris wheel, which in turn determines the power of the motor needed.

2. What is the formula for calculating the power of a motor for a big ferris wheel?

The formula for calculating the power of a motor for a big ferris wheel is P = (2πN)/60, where P is the power in watts, N is the torque in newton-meters, and 60 is the conversion factor from minutes to seconds. This formula takes into account the rotational speed of the ferris wheel and the torque needed to rotate it.

3. How does the height of a ferris wheel affect the power of the motor needed?

The height of a ferris wheel does not directly affect the power of the motor needed. However, a taller ferris wheel may require a larger motor to overcome the increased weight and resistance of the structure. Additionally, higher ferris wheels may require more powerful motors to maintain a consistent rotational speed.

4. Can a single motor power a big ferris wheel?

It is possible for a single motor to power a big ferris wheel, but it would depend on the size and weight of the ferris wheel. In most cases, multiple motors are used to distribute the load and ensure proper rotation of the ferris wheel.

5. How can the power of the motor be adjusted for different loads on the ferris wheel?

The power of the motor can be adjusted for different loads on the ferris wheel by using a variable frequency drive (VFD). This allows for the motor to adjust its speed and torque based on the weight and number of people on the ferris wheel, ensuring optimal performance and safety.

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