Parameter determination permanent split capacitor motor

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SUMMARY

The discussion focuses on the influence of magnetic saturation on parameter behavior during load tests of permanent split capacitor (PSC) motors. Participants inquire about integrating saturation effects into equivalent circuit calculations using classical tests such as DC-test, blocked rotor test, and no-load test. The conversation highlights the asymmetrical nature of the motor's windings and the importance of adjusting capacitor values for specific operational frequencies like 50 Hz and 60 Hz. The need for temperature correction in DC resistance measurements is also emphasized.

PREREQUISITES
  • Understanding of permanent split capacitor (PSC) motor design and operation
  • Familiarity with classical motor testing methods: DC-test, blocked rotor test, no-load test
  • Knowledge of magnetic saturation effects in electrical circuits
  • Basic principles of impedance and circuit analysis
NEXT STEPS
  • Research methods for integrating magnetic saturation into equivalent circuit models
  • Explore the impact of temperature on DC resistance measurements in PSC motors
  • Learn about capacitor selection for different operational frequencies in single-phase motors
  • Investigate advanced testing techniques for analyzing motor performance under load
USEFUL FOR

Electrical engineers, motor design specialists, and technicians involved in the testing and optimization of permanent split capacitor motors.

gilver
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Magnetic saturation seems to have a lot of influence on parameter behavior during load test on permanent split capacitor motors. Is there a method to integrate saturation in the equivalent circuit calculations . Is this possible when one uses the classical tests DC-test, Blocked rotor test, no load test, and determination of naux/nmain to estimate the circuit parameters. Thanks for any info or links Gilver
 
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Is this a symmetric reversible 3-terminal permanent split capacitor motor, with the same gauge wire and # of turns on both legs? By "DC" to you mean "static" load? Does the capacitor have different values for specific applications, or for 50 Hz/60 Hz?
 
Hey Bob S
Thanks for the reply

The single phase motor isn't a symmetrical one, the main and the aux have different impedance. There are four connections. The capacitor is adjusted for a specific working point;

DC-test put a dc -sopurce to the main (aux) and measure the curent. Then you can calculate the DC resistance. afterwards you have to correct it for the working temperature

My question concerns how can I put saturation effect in my equivalent circuit if the motor is connected as an permanent split capacitor motor, or an capacitor run motor
 

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