Finding a Suitable Rotary Actuator for Wheelchair Ramp

In summary: I'm glad to hear that these actuators still work well. In summary, a rotary actuator can be used to lower a lift ramp or to drive a linear actuator.
  • #1
recreated
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Can someone please help in finding a suitable rotary actuator?

I need it to lower the rear wheelchair ramp of a car. So the motor would attach directly to a shaft. When it causes the shaft to rotate it would lower the ramp which is welded onto the shaft. I'm finding it hard to find a rotary actuator that produces the 166N m of torque which is required. Any ideas? Or prehaps different mechanisms?
Thank you
 
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  • #2
Gear systems will help you with the torque problem. Although you might not have a heavy-duty motor, consider using a small gear to drive a large one. Based on the equations of mechanical advantage, a small motor with a high velocity and low torque can cause a large gear to produce high torque and slow rotations, which is most likely what you want.

Without knowing any specifics on how you want to design the system, consider using a worm gear system if you're trying to convert a shaft motion to another type of rotational motion.
 
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  • #3
Thank you, will uncover abit about worm gears and other gearing systems.
 
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  • #5
Rotary Actuator:

recreated said:
Can someone please help in finding a suitable rotary actuator?
I have modified these for various non-winching applications... or, could your lift ramp be modified to use a winch, similar to an elevator?

They are fairly inexpensive and powerful.

http://www.superwinch.com/p/lt2000-2-000-lbs-12v?pp=12
http://en.wikipedia.org/wiki/Elevator#Capacity

http://en.wikipedia.org/wiki/Worm_drive

http://en.wikipedia.org/wiki/Rack_and_pinion

http://vanconinc.com/equipment/wheelchair-lifts/OCR
 
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  • #6
That could be great,, I did think of using a motor attached to steel cable but didn't consider a wrench because i got rid of the idea but will start again. Could def be a great idea
Thank you
 
  • #7
Thank you Pantaz. I don't think it will be a suitable place for me. i have looked and book marked the site, could be very useful anyway
 
  • #8
Rotary Actuator:

recreated said:
I did think of using a motor attached to steel cable but didn't consider a wrench

OCR said:
I have modified these for various non-winching applications...

Actually recreated, what I did as a "modification" was to just remove the cable and fit a

sprocket and chain to the drum.

The chain drove a rack and pinion, which opened and closed the gates of a grain trailer.


I basically used the winch as a rotary actuator to drive a linear actuator.



OCR
 
  • #10
Hi Samuel Denson. http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif

The last responses to this thread are from over two years ago. If there is still a need for a rotary actuator then I'm sure your recommendation will be much appreciated.

Thanks for posting.
 
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1. What is a rotary actuator and how does it work?

A rotary actuator is a type of motor that converts rotational motion into linear motion. It typically consists of a motor, a control system, and a mechanism to convert the rotary motion of the motor into linear motion. The control system receives signals and commands from a user or a computer and uses them to control the motor, which then moves the mechanism in a specific direction.

2. Why do wheelchair ramps need rotary actuators?

Wheelchair ramps require rotary actuators to raise and lower the ramp to allow individuals using wheelchairs to access buildings or vehicles. The actuators provide the necessary power and precision to move the ramp smoothly and safely, making it easier for wheelchair users to enter and exit a space.

3. What factors should be considered when choosing a suitable rotary actuator for a wheelchair ramp?

Some important factors to consider when selecting a suitable rotary actuator for a wheelchair ramp include the weight and size of the ramp, the desired speed and range of motion, the available power source, and the control system. It is also crucial to consider the durability and reliability of the actuator, as well as any specific requirements for the wheelchair ramp.

4. Are there different types of rotary actuators available for wheelchair ramps?

Yes, there are various types of rotary actuators that can be used for wheelchair ramps, including electric, hydraulic, and pneumatic actuators. Each type has its own advantages and limitations, so it is essential to carefully evaluate the specific needs and requirements of the wheelchair ramp to determine the most suitable type of actuator.

5. How can one ensure the safety and reliability of a rotary actuator for a wheelchair ramp?

To ensure the safety and reliability of a rotary actuator for a wheelchair ramp, it is crucial to choose a high-quality actuator from a reputable manufacturer. Regular maintenance and inspections should also be conducted to identify any potential issues and address them promptly. Additionally, following the manufacturer's instructions for installation and usage can help to ensure the actuator operates safely and efficiently.

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