D.C motor speed controlImportant

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SUMMARY

The discussion centers on D.C. motor speed control, specifically the "novice method" and its alternatives. Participants clarify that the novice method likely refers to simply reducing the drive voltage, which is less effective than using Pulse Width Modulation (PWM). PWM is recommended for accurate speed control, and the importance of frequency in PWM signals is emphasized, noting that higher frequencies can lead to overheating. A PDF document detailing PWM and H-bridge control was also mentioned as a resource.

PREREQUISITES
  • Understanding of D.C. motor operation
  • Knowledge of Pulse Width Modulation (PWM)
  • Familiarity with H-bridge circuits
  • Basic electronics principles, including voltage and resistance
NEXT STEPS
  • Research the implementation of PWM for D.C. motor speed control
  • Study H-bridge circuit design and its applications
  • Explore the effects of PWM frequency on motor performance
  • Examine alternative D.C. motor control methods, such as variable resistors
USEFUL FOR

Electronics enthusiasts, hobbyists working on D.C. motor projects, and engineers seeking efficient motor control techniques.

KAS90
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Hello everyone

I have a small question concerning D.C motors speed control. I would like to ask about the "novice method"? I can't seem to find enough information about it, so can anyone just give me a brief explanantion of it? and what is the circuit used for it? otherwise can you give me any other explanation and circuit of any other D.C motor speed control?

Thanks a lot.

I really appreciate it.
 
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KAS90 said:
Hello everyone

I have a small question concerning D.C motors speed control. I would like to ask about the "novice method"? I can't seem to find enough information about it, so can anyone just give me a brief explanantion of it? and what is the circuit used for it? otherwise can you give me any other explanation and circuit of any other D.C motor speed control?

Thanks a lot.

I really appreciate it.

I believe you would usually use PWM of the DC input voltage to control the speed. Maybe the "novice method" is just reducing the drive voltage? That doesn't work very well, so maybe that's why they call it that?
 
berkeman said:
I believe you would usually use PWM of the DC input voltage to control the speed. Maybe the "novice method" is just reducing the drive voltage? That doesn't work very well, so maybe that's why they call it that?

By novice I think he just meant the easy way, in which case just decrease the voltage. If you need accuracy though use PWM.
 
I have never heard of the 'novice method' though like the other posts I feel that it indicates a simplified method of control. With a static input DC voltage, this can be done with a variable series resistance. I have included a PDF document attachment, which explains PWM and H-bridge control of DC motors, though the H-bridge is not the most simple of SCR DC motor control it is the most versatile. Its not great but I hope it is of some use.
 

Attachments

One other point. The higher the frequency of the PWM signal, the more eddy currents will be produced and the hotter the motor will become. In other words, don't use a 40 kHz PWM signal if a 60 Hz PWM signal will suffice.
 
Thanks a lot everyone, I really appreciate it, the information was very helpful..
I think then I will end up using PWM method for my project..
:)
 

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