Calculating Wheel Torque for Vehicle Dynamometer Design

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SUMMARY

The discussion focuses on developing a formula for calculating wheel torque necessary for a vehicle dynamometer design using LabVIEW. Key variables include vehicle speed, weight, grade percentage, and tire diameter. The goal is to create a dynamometer that accurately simulates road conditions to select appropriate motors, specifically using two 100HP electric motors with Variable Frequency Drives to regulate torque. The user seeks to derive a formula that converts these variables into a resisting force against the motor during operation.

PREREQUISITES
  • Understanding of vehicle dynamics and torque calculations
  • Familiarity with LabVIEW programming for data acquisition
  • Knowledge of electric motor specifications and Variable Frequency Drives
  • Basic principles of dynamometer design and operation
NEXT STEPS
  • Research "LabVIEW torque calculation algorithms" for implementation details
  • Study "vehicle dynamics equations" to refine torque calculations
  • Explore "Variable Frequency Drive configuration" for optimal motor control
  • Investigate "dynamometer design principles" for accurate road condition simulation
USEFUL FOR

Engineers, automotive researchers, and hobbyists involved in vehicle testing, dynamometer design, and electric motor selection will benefit from this discussion.

TestGuy2014
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I am trying to come up with a formula to use with my labview program that will calculate wheel torque required to move a vehicle with some given variables. I have vehicle speed, vehicle weight, % grade or angle, tire diameter. I am trying to create a dynamometer that can determine proper motor selection based off these vehicle characterics. So if i put in a certain grade and speed, the motor will either accelerate through it or it will start back driving based off what torque my dynamometer is holding back the motor.

Thanks for any help!
 
Last edited by a moderator:
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UltrafasPED:
- Thanks for the website, but I am not trying to create that type of dyno. I am running 2(100HP) electric motors into my differential. I am trying to replicate road conditions to spec. out a motor. The Varaiable Frequency Drives for the Motors can regulate speed or torque. I am trying to regulate torque based off road conditions. So by having the mass of the vehicle, tire coef. of friction, wheel rad, and % grad I am trying to come up with a formula that takes those varialbes and turnes it into a force that fights my motor as i am throttling up and down.
 

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