Motor Torque, Starting Torque, Stall Torque, Load Torque

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Discussion Overview

The discussion revolves around understanding the concepts of motor torque, specifically the differences between starting torque, stall torque, and load torque in the context of electric motors. Participants explore the implications of these torque values on motor performance and load movement.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant inquires about the differences between starting torque and stall torque, and the implications of motor torque equating to load torque.
  • Another participant explains that starting torque is the torque required to overcome initial resistance and accelerate the load, while running torque is less than starting torque and maintains steady speed.
  • Stall torque is described as the torque that can stop the motor and load, with a caution about the risks of excessive current draw if protection devices are not in place.
  • A separate participant asks about the specific torque produced by a 7.5 hp electric DC motor at 1000 rpm, indicating a practical application of the discussed concepts.

Areas of Agreement / Disagreement

There appears to be a lack of consensus on the definitions and implications of the different types of torque, as well as the conditions under which motor torque equals load torque. Some participants provide explanations while others raise questions, indicating ongoing exploration of the topic.

Contextual Notes

Participants have not fully resolved the definitions and relationships between starting torque, stall torque, and load torque, nor the conditions affecting motor operation.

Who May Find This Useful

Individuals interested in electric motor operation, including engineers, students in mechanical or electrical fields, and hobbyists working with motors.

coolrox86
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Hi, I am new here.

I have some problems with the engine motor. What is the difference between starting torque (or locked up torque) and stall torque?

What happen if motor torque = load torque? Will the mass move up with constant speed or stay stanionary? motor torque = stall torque = load torque?

Thanks for any help and suggestion! :smile:

Regards
coolrox
 
Engineering news on Phys.org
I hope this works
 

Attachments

Assuming you are asking about an electric motor...

Starting torque = torque reqd to overcome friction, load inertia, stiction, etc., and accelerate the load inertia. This is meant to be a transient value.

Running torque or load torque = less than starting torque, keeps the previously accelerated inertia + load at steady state speed.

Stall torque = torque value that will slow down and stop your motor + load. Hopefully you have properly wired your motor protection devices and they will kick in. Otherwise the motor will draw a lot of current, heat up, catch fire, burn your building down.
 
i have a 7.5 hp electric dc motor
what is the torque produced at 1000rpm
 

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