Capacitors in Electric Motors: Usage & Benefits

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Discussion Overview

The discussion revolves around the role and functionality of capacitors in electric motors, particularly in fans and cooler motors. Participants explore various questions related to charging capacitors with DC, their behavior with AC and DC currents, and the specific applications of capacitors in motor operation.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • Some participants inquire about the specific uses of capacitors in electric motors, suggesting they assist in starting the motors and may also serve as running capacitors.
  • Questions are raised about the ability to charge a capacitor using DC, with some participants indicating that it can be done by connecting a DC voltage across the capacitor's terminals.
  • There is a discussion on why capacitors allow AC to flow but not DC, with one participant noting that DC current flows until the capacitor is charged to the applied voltage, at which point the current stops.
  • Participants express curiosity about the practical explanation of why the frequency of DC is zero and its implications for capacitor behavior.

Areas of Agreement / Disagreement

Participants generally agree on the basic functionality of capacitors in electric motors and their charging behavior with DC. However, there are varying levels of understanding regarding the implications of these behaviors, particularly in relation to AC and DC currents, indicating that some aspects of the discussion remain unresolved.

Contextual Notes

Some limitations include potential missing assumptions about the conditions under which capacitors operate, as well as the need for clearer definitions of terms like "charging" in the context of DC and AC currents.

Who May Find This Useful

This discussion may be useful for individuals interested in electrical engineering, motor design, or those seeking to understand the practical applications of capacitors in electric circuits.

mkbh_10
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What is the use of having capacitors in fans, cooler motors or other electric motors ?
 
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2 more questions :Can we charge a capacitor by DC , if yes then how ? Why does capacitor allow ac to flow through but not dc . For 3rd part i know frequency of dc is zero but in practical terms how will it be explained ?
 
mkbh_10 said:
What is the use of having capacitors in fans, cooler motors or other electric motors ?
They are used to help start the motors. There are also running capacitors.
 
mkbh_10 said:
2 more questions :


Can we charge a capacitor by DC , if yes then how ? Why does capacitor allow ac to flow through but not dc . For 3rd part i know frequency of dc is zero but in practical terms how will it be explained ?

you can.. you connect the DC voltage across the terminals of the capacitor. but the current doesn't flow through it, at least at the steady state.
 
DC current flows but stops when the C is charged.. When the voltage across the C = appiled voltage.
 

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