What are alternative techniques for starting a DC motor from rest?

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SUMMARY

Starting a DC motor from rest can be effectively achieved using various techniques beyond traditional rheostats. The discussion highlights the importance of managing the applied voltage to facilitate motor startup while considering the back EMF generated by the armature. Suggested methods include utilizing power electronics and exploring reduced voltage starters, which are essential for controlling the initial current flow. Resources such as simulation models and academic papers provide valuable insights into these alternative starting methods.

PREREQUISITES
  • Understanding of DC motor operation and back EMF principles
  • Familiarity with power electronics concepts
  • Knowledge of reduced voltage starters and their applications
  • Basic skills in using simulation software for motor modeling
NEXT STEPS
  • Research "DC motor reduced voltage starters" for various starting techniques
  • Explore "power electronics for motor control" to understand advanced methods
  • Investigate simulation tools for modeling DC motor startup scenarios
  • Review academic papers on "DC motor starting methods" for in-depth analysis
USEFUL FOR

Electrical engineers, motor control specialists, and anyone involved in designing or optimizing DC motor startup processes will benefit from this discussion.

PRoberts1244
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Having been asked to identify two methods of starting a DC motor from rest, I am struggling to get anything on the internet apart from Rheostats. Does anyone know of another technique that can be adopted for DC motor start-up?



no equations required



Knowing that the aramture when the DC motor is running, produces a back EMF that acts in resistance to the applied voltage and this field collapses or is not present once stationary. The problem lies with techniques that resist the applied voltage in order to allow the motor to start running and finally the armature back EMF up and running, therefore eliminating the need of the starter.

Ideally a viable technique would incorporate some form of power electronics. I am not necessarilary lloking for the answers but more of a point in the right direction.
 
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Try a google search. This note says, "There are five main types of reduced voltage starters ..." so might give you some ideas for further research.

http://www.globalspec.com/learnmore/motion_controls/motors/motor_starters_accessories/dc_motor_starters

This note examines three methods, and models them on a simulator. http://www.google.com.au/url?sa=t&rct=j&q=%22dc%20motor%22%20starting&source=web&cd=24&ved=0CFIQFjADOBQ&url=http%3A%2F%2Fwww.ijens.org%2FVol%252011%2520I%252002%2F115302-6464%2520IJECS-IJENS.pdf&ei=dq7gTpC2GeepiAeXrunIBQ&usg=AFQjCNG-ehblBAeLV-DuMSXoYnfNI2X6dw&cad=rja
 
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