Calculating Torque for Car with Hub Motor - Yanikomer

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Discussion Overview

The discussion revolves around calculating the required torque for a hub motor in a car design. Participants explore the necessary equations and concepts related to acceleration, friction, and inertia to achieve a target speed of 40 km/h within one minute.

Discussion Character

  • Technical explanation
  • Mathematical reasoning
  • Homework-related

Main Points Raised

  • One participant, yanikomer, seeks equations to calculate the required torque for a hub motor based on the car's mass and desired speed.
  • Another participant suggests calculating the required acceleration first and notes that the torque requirement includes both frictional torque and inertia torque.
  • A further inquiry is made about sources for finding the relevant equations.
  • Another participant proposes using the formula a = dv/dt to determine acceleration, indicating that the required force consists of inertial force and friction.

Areas of Agreement / Disagreement

There is no consensus on the specific equations or methods to calculate the required torque, and multiple approaches are suggested without resolution.

Contextual Notes

Participants have not fully defined the assumptions regarding friction coefficients or the specific system dynamics, which may affect the calculations.

yanikomer
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i am making a car and i will use hub motor on it.

car+driver=150kg
i want the car to reach 40 km/h in 1 min.
so i need to calculate the required torque for the hub motor to move the car and make the car to reach required speed.

what are the equations to calculate this?

thank you for your help

yanikomer
 
Engineering news on Phys.org
calculate the acceleration required. Torque requirement is the frictional torque(at bearings, wheels etc) plus the inertia torque of the system.
 
is there any source that i can find the equations about it ?

thank you for your help.
 
use a = dv/dt to calculate the acceleration. Required force is the inertial force m*a plus the friction
 

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