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Scorpius Wireless virtual dyno. RPM, torque and power
#1

Hi Gentlemen,
    This is for any motor and has nothing to do with it being digital or analogue.
Back EMF detection (it’s just the leftover voltage retuning to the source) along with some calculations can give us a tool that can show us:
RPM
Torque
Power
Just like a 1:1 dyno test 
As Back EMF is now included in telemetry you can work out the torque if you know the armature resistance. 
This video explains it very clearly.

Now we have not just a real time wireless tacho we also have the same for torque.

Power. Once you know the RPM and torque etc you can work out the power.

And like all telemetry this can be shown on the OLED screen.

https://youtu.be/ndseqKIlR9c?si=Z1yoyoUPoH0lvK_G

Once you have the hardware anything can be a achieved.

www.scorpiuswireless.com
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#2

Remember the old Tamiya speed checkers? Once cheap now not so cheap but inspiration for a Scorpius MPD powered version with telemetry.
What about two modern day versions. One for Scorpius cars, another for analogue cars.
Both set ups need a Scorpius controller, dongle, and either a Scorpius MPD installed in the car (Scorpius mode) or one installed in the speed checker (for analogue cars).
All the Tamiya electronics are bypassed. We are only using it or similar products to act as the roller chassis.
To wire the MPD into the speed checker is 2 simple power wires and 2 wires to the braid contacts on the checker. Identical to chipping a car.

Now use the controller to run the analogue or Scorpius car on your new speed checker. Rev it. Test it.

Now go to your laptop, insert dongle and run free Car Data program.
Watch the data flow in 100 times a second. Not all the data is relevant ti analogue cars but the updated telemetry message will contain the following. And dual radio Comms will allow us to do whatever we want on Channel 25, telemetry. I believe F1 cars have over 100 telemetry streams. We’re up to 17 Tease
1. Car ID*
2. Car PIN
3. Motor drive PWM*
4. Brake drive PWM*
5. Sector 
6. Lane 
7. Lane change request status.
8. Version Number 
9. Tacho RPM•
10.Back EMF• 
11.Current detection•
12.Torque in N-m• 
13.Power in watts•
14.Fuel level in litres 
15.Tyre level %
16.Brake pad level %
17.Damage level %

*These data points would interest ppl analysing analogue cars.

Use the tools to compare and test motors. Use current detection to detect motors on the way out.
Use the tacho to detect freak motors and dog motors.
Use torque detection to find the quickest accelerating motor.

This tool would be handy for those setting up a car for an upcoming competition. 

So by adding on a few circuits and a fair amount of firmware we can achieve a full digital analyse of 3 most important bits of motor information.

Picture of a typical speed checking device. 

   
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#3

This is very cool information. Thank you very kindly.  Thumbup
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#4

[video=youtube]http://https://youtu.be/hgW1fH08cVc?si=gAze-bWeEUzGxXzd[/video]
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#5

The video lin k isn't working, get rid of the leading 'http://' in the link then it'll play  Thumbup

Life is like a box of Slot cars... Cool Drinkingcheers
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#6

"Just like a 1:1 dyno test"

..but not exactly the same ?
Don't these measurements and calculations refer to the power the motor is consuming?
IE Not the power the motor is producing?

AlanW
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#7

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#8

(28th-Dec-23, 09:09 AM)INonfractal Wrote:  "Just like a 1:1 dyno test"

..but not exactly the same ?
Don't these measurements and calculations refer to the power the motor is consuming?
IE Not the power the motor is producing?

AlanW

Exactly the same but using different data and algorithms to achieve the same end result. RPM, HP (in this case watts) and torque. 
I’ve fixed up the video link. The first few minutes explains it.


Power in watts is simply current x voltage. We can determine current and we know the voltage.
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