Torque on a shaft connecting to a wheel

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Discussion Overview

The discussion revolves around the torque experienced by a shaft connected to a wheel driven by a motor. Participants explore the relationship between the torque applied at the wheel and the torque on the shaft, considering various scenarios including drag forces and steady-state conditions.

Discussion Character

  • Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant states that if the wheel and shaft axes are collinear, the torque on both is the same.
  • Another participant questions the context of the 20Nm torque, asking whether it is applied by the motor, at the wheel, or if it is a net torque.
  • A participant with an electrical background describes a scenario involving drag force and asks if the torque produced by the motor would equal the torque at the wheels under steady-state conditions.
  • One participant suggests that if the motor shaft is directly coupled to the wheel, they experience the same torque, providing a specific example with different radii and drag forces to illustrate their point.

Areas of Agreement / Disagreement

Participants generally agree that if the motor and wheel are directly coupled, they see the same torque. However, there are competing views regarding the interpretation of the initial torque value and its application context, indicating that the discussion remains unresolved.

Contextual Notes

There are ambiguities regarding the application of torque, including whether it is net torque or applied by the motor or at the wheel. The discussion also involves varying assumptions about the system's configuration and conditions.

Who May Find This Useful

Individuals interested in mechanical systems, particularly those involving torque transmission in motor-driven applications, may find this discussion relevant.

zuq
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hi guys

Lets say I have a wheel that is driven by a shaft connected straight to a motor.

Wheel raidus is 0.0762m while shaft raidus is 8mm.

If I know the torque acting on the wheel, say 20Nm , what would be the torque on the shaft?

Thanks
 
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Exactly the same.
 
It's an abiguously worded question.
Is the 20Nm applied by the motor? Or applied at the wheel (as a brake), or is it a net torque?

A torque acts about an axis.
If the axis of the wheel and the shaft axis are colinear, they are the same.
 
Thanks Pkurse and xxChrisxx

@xxChrisxx

My background is in electrical, so bare with me please.
This is for a kart where say 50Newtons of drag force is opposing the karts movement. In terms of torque at wheels, for a radius of 0.5m say it becomes 25Nm.

Now if the motor is directly coupled to the wheel, with shaft radius of say 0.25m (overly exaggerating) will the torque produced by motor be 25Nm in steady state conditions?..i.e. not accelerating and keeping at a constant velocity.

And offcourse the motor and wheel will have same RPM.
 
If motor shaft is directly coupled to the wheel, then they see the same torque. Assuming one wheel drive, r at .25, drag at 50, then torque is 12.5.
 

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