PIC DC Motor Dynamometer ?
mikefrancis
Posts: 4
Hi,
I'm a newcomer, and have the BASIC Stamp Kit. Having completed the basic exercises, I'd like to develop a practical application (in this case for model airplane development)
Here's what I want to do....... develop a "Propeller Efficiency Rig" (a.k.a a Dynamometer).
Basically, I would mount a number of different·designs of model airscrew propellors on a DC motor shaft, run the motor up through a given·RPM range, and be able to measure the following :
RPM
Current In (A)
Voltage In (V)
Power·In (WI = V X A)
Power Out (WO)
Torque (Nm) (this can probably be derived from RPM and WO)
Thrust (N) (I'll probably need to mount the motor and propeller on a low friction slider, the whole assembly in turn connected to a load cell)
Air Velocity (M/S) (I would use an anomometer for this)
During each run, I would want to collect the data for each of the above parameters say on a one-second timebase, and populate an Excel speadsheet automatically.
All ideas, suggestions, previous designs I can adapt, and the hardware options I would need, data capture software·etc·will be most welcome
Thanks !!
Mike Francis
·
I'm a newcomer, and have the BASIC Stamp Kit. Having completed the basic exercises, I'd like to develop a practical application (in this case for model airplane development)
Here's what I want to do....... develop a "Propeller Efficiency Rig" (a.k.a a Dynamometer).
Basically, I would mount a number of different·designs of model airscrew propellors on a DC motor shaft, run the motor up through a given·RPM range, and be able to measure the following :
RPM
Current In (A)
Voltage In (V)
Power·In (WI = V X A)
Power Out (WO)
Torque (Nm) (this can probably be derived from RPM and WO)
Thrust (N) (I'll probably need to mount the motor and propeller on a low friction slider, the whole assembly in turn connected to a load cell)
Air Velocity (M/S) (I would use an anomometer for this)
During each run, I would want to collect the data for each of the above parameters say on a one-second timebase, and populate an Excel speadsheet automatically.
All ideas, suggestions, previous designs I can adapt, and the hardware options I would need, data capture software·etc·will be most welcome
Thanks !!
Mike Francis
·
Comments
Here is the link:
http://www.parallax.com/ProductInfo/Microcontrollers/BASICStampSoftware/tabid/441/Default.aspx
StampPlot Pro·and StampPlot Lite are two great programs.
Good Luck
Technic-R-C
Regards
Mike Francis
-Martin
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SelmaWare Solutions - StampPlot GUI for controllers, XBee and Propeller Application Boards
Southern Illinois University Carbondale, Electronic Systems Technologies
American Technical Educator's Assoc. Conference·- April, Biloxi, MS. -- PROPELLER WORKSHOP!
Mike Francis
DEBUG DEC myVal,CR
Or, more complex depending on need.
It also has a good help file.
PLX-DAQ comes with sample code that can be downloaded, and the help files are great too.
I'd recommend PLX-DAQ for your specific application, you can dump it all to the spreadsheet and plot/calculate quickly.
I wrote both, so I'm happy either way if it meets your needs!
-Martin
However, I'm not sure if I could get a stepper to run fast enough continuously (having never used one before) - I'll need to get up to several thousand RPM.
Martin - thanks for the DAQ - that tool seems to be perfect for my application - I should be able to create some very sexy performance graphs (in excel) with that !
-Martin
▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
SelmaWare Solutions - StampPlot GUI for controllers, XBee and Propeller Application Boards
Southern Illinois University Carbondale, Electronic Systems Technologies
American Technical Educator's Assoc. Conference·- April, Biloxi, MS. -- PROPELLER WORKSHOP!