How to approach this modeling

Projects General Guidance
1

Hey guys I need help with modeling something using Arduino. I want to model the function of a capstan, a capstan being a huge drum barrel on top of a concrete block. When the capstan turns on it slowly rotates with a rope wrapped around it, 1 end on the load, and 1 end freehand on the dock. The idea is there are 4 of these working uniformly.

However, I would like to start off by just modeling 1 and later adding 3 more motors,

My overall approach is the following to model the first capstan.

Motor

  • P Serires Nema 23 Bipolar 3Nm
  • Digital Stepper Driver 1.8-5.6A 20-50VDC for Nema 23, 24, 34 Stepper Motor

Board
I haven't been able to choose yet but I am leaning towards
Arduino Nano 33 IOT

Capstan
will be 3D printed
Ideally the stepper motor will be housed in a box that sits directly under the capstan.

drum

Gearbox

In terms of providing a gearbox, I found one that suits my needs, I will be using the following gearbox and adjusting for the measurements of Nema 23 instead of Nema 17

How Planetary Gears Work - 3D Printed Planetary Gearbox Design and Test (howtomechatronics.com)

My project vision is as follows

Capstan --> Plate connection ---> Housing box ( With gearbox and Arduino board ) ---> driver on the outside.

Any advice will be appreciated!

2

Why stepper motor? DC motor looks more suitable.

3

I would start out with an Uno or Nano vs. the Nano 33 IoT. Those are much, much more common and supported by (almost all) the libraries you may or may not want to use. The Nano 33 IoT is not an AVR controller.

4

Stepper motor has more torque, this capstan still has to pull some weight towards it .

5

you need not invent thing that already there. you need huge gear ratio and only DC motor with its huge RPM is here suitable.

6

If you compare a DC-Motor with a wormgear of a particular size with a stepper-motor of the same size the DC-motor will have 5 times more torque than the stepper-motor.

You will have to describe more details to see if a stepper-motor really is best suited for this application.

best regards Stefan

7

No. You can buy a DC motor and gearbox with just about any desired torque, and they are much more efficient and easier to control than steppers.

1 Like
8

You need to say what are you “modelling” * and what will the Arduino do ?

  • just making a small one or investigating it’s behaviour ?
9

As above… to do any modelling, you need to specify a LOT more parameters…

The diameter of the capstan, the weight, diameter and length of the ropes, torque and RPM of the motor, among other things.

What results are you looking to derive from the model ? power inout. Overall strength of the mounting points !

Just glue a cotton reel onto a shaft and get started with preliminary measurements. graph them out and you can extrapolate many of your answers.

10

Rubbish...use a dc motor/gearbox.

1 Like
11

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