CIM motor question

[BBray_T1296]

MiniCIMs were designed as a drop-in replacement for the CIM. They certainly work in parallel with each other.

The MiniCIM is widely regarded as 2/3's of a CIM, as it has roughly that much available power ratio.

This being said, the MiniCIM and CIM are very similar early on in the power curve, with all but the more strenuous situations being handled just as easily by the Mini as its larger counterpart. This leads many teams to prefer the Mini in systems, as they find the torque advantage of the larger not worth its additional weight.

[cbale2000]

Originally Posted by BBray_T1296

This being said, the MiniCIM and CIM are very similar early on in the power curve, with all but the more strenuous situations being handled just as easily by the Mini as its larger counterpart. This leads many teams to prefer the Mini in systems, as they find the torque advantage of the larger not worth its additional weight.

Do you have a link to those power curves? I've seen the one for the CIMs but haven't been able to find anything on the MiniCIMs.

[BBray_T1296]

Originally Posted by cbale2000

Do you have a link to those power curves? I've seen the one for the CIMs but haven't been able to find anything on the MiniCIMs.

A while back I tried to generate a theoretical curve using at stall and free speed data, and it was the conclusion I reached. Not sure if I have access to my spreadsheets anymore.

I have heard some dynamometer data but I realize that is a terrible source.

Sorry I can't really answer your question, perhaps someone who has actually put one on a dyno could help.

[theCADguy]

Here is a spreadsheet that I made about a year ago to generate power curves based on motor specs such as free speed, stall current, etc. Basically, you can make curves for pretty much any motor out there if you have the specifications available. Here's the Excel file:

motorCalc.zip

To use it, put the specs into input box on sheet 1, and it will then run a macro to calculate the speed, current, power, and efficiency at different torque intervals.

After the macro runs (might take a few minutes if you want a high resolution graph), go to the Chart1 sheet. Then use the select data tool to get the correct data ranges for the curve. (The ranges vary based on your motor/graph accuracy) Apologies if its not the most user friendly sheet, since I was a beginner at Excel/Visual Basic when I made it.

I tested its output against the existing CIM motor curve, and it seems to be accurate.

[GeeTwo]

I found this link to a 2014 motor curve spreadsheet which includes mini-CIM on this post. The front sheet lists the stall and free numbers and does some theoretical stats. Go the the tab named after each motor (e.g. MiniCIM) to find a power curve.

Edit: Ninja'd!