Speed Reduction, Torque, high Rpms's?

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Discussion Overview

The discussion revolves around the relationship between motor speed (RPM), torque, and gear reduction. Participants explore whether it is possible to increase torque while recovering lost RPMs after implementing a gear reduction, and the implications of motor power on these factors.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant questions if gear reduction can be used to gain back lost RPMs while increasing torque, suggesting a potential for both torque and RPM increase.
  • Another participant asserts that while gear reduction can increase torque, it cannot simultaneously increase the speed of the load while maintaining extra torque.
  • A third participant explains that the torque provided by a motor at a given speed is determined by the motor's construction and is independent of the load it is connected to.
  • A fourth participant clarifies that gearing down reduces RPM and increases torque, maintaining the same power, and warns against driving the motor faster, as it may lead to burnout.

Areas of Agreement / Disagreement

Participants express differing views on the possibility of recovering RPMs after gear reduction while increasing torque. There is no consensus on the feasibility of achieving both outcomes simultaneously.

Contextual Notes

Participants discuss the limitations of motor power and the implications of gear ratios, but do not resolve the mathematical relationships or assumptions involved in these dynamics.

MountainDew
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hello, i am unsure if someone will be able to help me with this?

If you have a motor running at say 3000 rpm's, and the torque "needed" is more than the motor has to offer. Can you do a gear reduction to get more torque, and gain "all or most" of the lost rpm's back after reduction is made?

or maybe get more torque and more rpm's?
 
Last edited:
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If I understand the question correctly, the answer is 'no'. You could use gear reduction to increase the torque, then use another transmission after your high-torque load to output a high-speed/low-torque rotation. You could not, however, increase the speed of your load while maintaining extra torque.
 
The motor has a certain available power at any point on it's operating curve. The torque provided by a motor at a given speed is a function of it's construction and the components used to drive the motor, not what it is connected to.
 
In other words, if you gear-down the motor, you reduce the rmp and increase the torque, keeping the power the same. If you try to drive the motor faster (with higher voltage or frequency depending on the type of motor), you risk burning it out.
 

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