Capacitors in Electric Motors: Usage & Benefits

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SUMMARY

Capacitors are essential components in electric motors, including fans and cooler motors, primarily used for starting and running the motors efficiently. They can be charged using direct current (DC) by connecting the DC voltage across the capacitor terminals, although current flow ceases once the capacitor is fully charged. Capacitors allow alternating current (AC) to flow due to their ability to store and release energy, while they block direct current (DC) after charging, as the frequency of DC is effectively zero. This behavior can be explained practically by understanding the charging process and the role of frequency in current flow.

PREREQUISITES
  • Understanding of electric motor operation
  • Basic knowledge of capacitors and their functions
  • Familiarity with AC and DC current characteristics
  • Knowledge of electrical circuit principles
NEXT STEPS
  • Research the role of starting and running capacitors in electric motors
  • Learn about the charging process of capacitors using DC voltage
  • Explore the differences between AC and DC current flow in capacitors
  • Investigate practical applications of capacitors in various electrical devices
USEFUL FOR

Electrical engineers, technicians working with electric motors, and students studying electronics will benefit from this discussion on capacitors and their applications in motor systems.

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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