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#1
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2.5" CIM Motor stops when climbing
Is the CIM motor enough to lift robot? After rope winds our motor stops and robot can not go up.
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#2
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Re: 2.5" CIM Motor stops when climbing
What gear reduction (if any) do you have connected to the CIM? What drum/winch diameter?
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#3
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Re: 2.5" CIM Motor stops when climbing
Any.
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#4
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Re: 2.5" CIM Motor stops when climbing
Can you post a picture of your robot? It would help us figure out a solution.
A CIM motor is plenty powerful enough to make the robot climb. |
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#5
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Re: 2.5" CIM Motor stops when climbing
How to send photo easily? Only link?
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#6
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Re: 2.5" CIM Motor stops when climbing
The problem may be inadequate gear reduction.
But you need to provide more detail if you want more definitive help. Describe the complete drivetrain from the CIM to the winch, including gear reductions, winch diameter, and rope diameter. And post a couple of well-focused pictures. You can attach them to your CD post, or you can upload them to imgur.com and provide links. |
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#7
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Re: 2.5" CIM Motor stops when climbing
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#8
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Re: 2.5" CIM Motor stops when climbing
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#9
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Re: 2.5" CIM Motor stops when climbing
Quote:
What is the diameter of the winch? What is the diameter of your rope? |
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#10
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Re: 2.5" CIM Motor stops when climbing
That works, thanks!
It looks like you need a larger gear reduction than what you have right now. If you can put a gearbox between the CIM and the climbing shaft, then the climbing shaft will have more torque. This would probably work: http://www.andymark.com/ToughBox-p/am-toughbox.htm I am not sure how long shipping takes to your part of the world. Do you have any other gearboxes, or know teams in your area that might have old gearboxes? |
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#11
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Re: 2.5" CIM Motor stops when climbing
You will need a gear reduction of some sort. Our robot for 2016 used about a 35:1 gear reduction or so for our winch. We also used only one CIM and it worked perfectly fine for us. We usually were able to climb in about 4 to 5 seconds after the hook was put on the bar.
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#12
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Re: 2.5" CIM Motor stops when climbing
Quote:
That's why I've asked the OP to tell us their winch diameter and rope diameter. |
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#13
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Re: 2.5" CIM Motor stops when climbing
Winch diameter is 3cm and rope diameter is 1,5cm.
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#14
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Re: 2.5" CIM Motor stops when climbing
Can we find another solution but using gearbox? On the motor side small gear, on the shaft side big gear possible?
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#15
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Re: 2.5" CIM Motor stops when climbing
Maximum robot mass = 70 kg. Maximum robot weight = 70 x 9.8 = 690 N.
Effective winch radius = (winch diameter + rope diameter) / 2 = 2.25 cm. Winch torque needed to lift robot = 2.25 x 690 = 1550 N-cm = 15.5 N-m. At maximum power, CIM motor torque = 1.2 N-m. [Note: climbing is fastest at maximum power.] Climbing time = lift height x robot weight / winch power = 1 meter x 690 N / 330 W = 2.1 sec. Gear ratio required = 15.5 / 1.2 = 13:1. Andymark Toughbox with 12.75:1 ratio is in stock as I type this. All of the above calculations are simplified by neglecting fricition losses. A real robot will require more climbing time. Last edited by Richard Wallace : 05-02-2017 at 07:28. Reason: Climbing time calculation |
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