Motor Resisting Variable Downward Force

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SUMMARY

The discussion centers on the need for a motor system capable of resisting a downward force of 100-200 lb with a programmable resistance of 5-30 lb, controlled by an Arduino. Electric motors can function in reverse to create a braking effect, but they must handle sustained stall currents, necessitating a more robust motor than typically used. The concept of regenerative braking is highlighted as a relevant technique, allowing for energy recovery during the braking process. Researching "torque motor" is also suggested as a potential solution for this application.

PREREQUISITES
  • Understanding of Arduino programming
  • Knowledge of electric motor types and specifications
  • Familiarity with regenerative braking concepts
  • Basic principles of torque and load management
NEXT STEPS
  • Research "regenerative braking" techniques and applications
  • Explore "torque motor" specifications and use cases
  • Learn about "sustained stall current" in electric motors
  • Investigate motor control methods using Arduino
USEFUL FOR

This discussion is beneficial for engineers, hobbyists, and developers working on motor control systems, particularly those interested in load management and energy-efficient designs.

omalleyt
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I have a system where a cable is pulled down with a load of 100-200 lb. I need a motor that resists this load with a force that can be programmed to be anywhere from 5-30 pounds. I don't want the motor to stop the downward motion, just to offset the magnitude of the force pulling down on the cable. I will be using an Arduino to control the level of resistance provided by the motor. Is this possible and if so what type of motor/system could I use? Thanks!
 
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Any electric motor can work 'in reverse' to produce a braking effect. The only problem would be that it would have to cope with what really is a sustained stall current - or worse - so you could need a beefier motor than you would use conventionally. Just by shorting the supply leads to an unpowered motor, you can produce braking (you've got a generator, in effect, which takes energy). I recommend googling regenerative braking and see what you get. This is quite a hot topic at the moment so you should be quite lucky there.
 
try a google on "torque motor"

it might do what you want I'm not sure
 
Most likely this can only be answered by an "old timer". I am making measurements on an uA709 op amp (metal can). I would like to calculate the frequency rolloff curves (I can measure them). I assume the compensation is via the miller effect. To do the calculations I would need to know the gain of the transistors and the effective resistance seen at the compensation terminals, not including the values I put there. Anyone know those values?

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