DC Shunt Motors: Differences from Simple DC Motors and Relation to Generators

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Discussion Overview

The discussion centers on the differences between DC shunt motors and simple DC motors, as well as their relationship to generators. Participants explore the characteristics of these motors, particularly in terms of torque and speed, and raise questions about the underlying principles governing their performance.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants inquire about the differences between DC shunt motors and simple DC motors, specifically regarding their operational characteristics.
  • One participant shares a URL with torque vs RPM curves for various types of DC brush motors, noting that the shunt wound motor has the flattest torque curve.
  • Another participant questions why the speed-torque curve of the shunt wound DC motor differs from that of a permanent magnet motor, expressing surprise at the apparent differences despite both having constant applied flux.
  • There is a shared sense of puzzlement among participants regarding the observed differences in performance characteristics between the motor types.

Areas of Agreement / Disagreement

Participants express curiosity and raise questions, but there is no consensus on the reasons behind the differences in motor characteristics or the relationship to generators. The discussion remains unresolved.

Contextual Notes

Participants have not provided specific contexts for their questions, such as applications or operational conditions, which may influence the discussion. There are also unresolved assumptions regarding the definitions of motor types and their operational principles.

gurpreet_leh
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how dc shunt motors are different from the simple dc motors and is there any relation between between generators
 
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gurpreet_leh said:
how dc shunt motors are different from the simple dc motors and is there any relation between between generators

Welcome to the PF. What is the context of your question? What are you going to use this motor for?
 
The attached URL has torque vs RPM curves for four different types of dc brush motors, the most common of which are the shunt wound, the series wound, and the permanent magnet. The shunt wound dc brush motor has the flattest torque curve. See
http://www.reliance.com/mtr/mtrthrmn.htm
Bob S
 
Bob S said:
The attached URL has torque vs RPM curves for four different types of dc brush motors, the most common of which are the shunt wound, the series wound, and the permanent magnet. The shunt wound dc brush motor has the flattest torque curve. See
http://www.reliance.com/mtr/mtrthrmn.htm
Bob S

I took a quick glance at the link. Why is the shunt wound DC motor speed-torque curve different than a permanent magnet motor. I find this suprizing. Both would seem to have a constant applied flux. Do you happen to know?
 
Phrak said:
I took a quick glance at the link. Why is the shunt wound DC motor speed-torque curve different than a permanent magnet motor. I find this suprizing. Both would seem to have a constant applied flux. Do you happen to know?
I saw that, and was also puzzled.
Bob S
 

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