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Shaval Patil

The document discusses the Capacitor Start, Capacitor Run Motor, highlighting its architecture, benefits, and operational principles. It explains how this motor configuration provides high starting torque and efficient performance, making it suitable for applications like pumps and compressors. Additionally, it covers capacitor selection and the advantages of improved power factor and smoother operation.

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20 views10 pages

Shaval Patil

The document discusses the Capacitor Start, Capacitor Run Motor, highlighting its architecture, benefits, and operational principles. It explains how this motor configuration provides high starting torque and efficient performance, making it suitable for applications like pumps and compressors. Additionally, it covers capacitor selection and the advantages of improved power factor and smoother operation.

Uploaded by

shrutimalvankar.ntpl
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPTX, PDF, TXT or read online on Scribd
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NAME : SHAVAL PRASHANT PATIL

53 H
SUBJECT : B.E.E
TOPIC NAME : CAPACITOR START, CAPACITOR RUN
MOTOR
Capacitor Start,
Capacitor Run Motor
Explore the architecture and benefits of capacitor start, capacitor
run single-phase induction motors. Understand how they deliver
reliable torque and efficient operation across diverse applications.
Single-Phase Induction
Motor Basics
Construction Starting Challenge
Comprises stator winding No inherent starting torque
and squirrel cage rotor. unlike three-phase motors.

Self-Starting
Needs auxiliary methods for reliable startup.
Capacitor-Start, Capacitor-Run Configuratio
Start Capacitor (Cs) Run Capacitor (Cr)

Connected in series with auxiliary winding during startup. Remains in series with auxiliary winding throughout
operation.
Starting Operation (Capacitor-Start)
1 Large Starting Torque 2 Phase Difference 3 Torque Range
Start capacitor (Cs) supplies Creates ~90° difference Starting torque reaches 150-
strong initial push. between main and auxiliary 300% of full-load torque.
currents.
Running Operation (Capacitor-Run)
Start Capacitor Run Capacitor Role Smoother Operation
Disconnected
Improves power factor and Reduces noise and vibration for
Cs is switched off by centrifugal efficiency during continuous reliable motor performance.
switch or relay after startup. operation.
Capacitor Selection:
Start Capacitor (Cs)
Type Capacitance Range
Electrolytic capacitor, Typically 50 to 500
designed for short duty microfarads (μF).
cycles.

Voltage Rating
Rated for 250 to 400 VAC
Capacitor Selection: Run Capacitor (Cr)
Type Capacitance Range Voltage Rating

Oil-filled or film capacitor built for Ranges from 5 to 50 microfarads (μF). Typically rated between 400 to 600
continuous use. VAC.
Advantages and Applications
High Starting Torque & Performance Power Factor Correction
Excellent torque and smooth running characteristics. Operating power factor improved to around 0.8-0.9.

Typical Uses Cost Consideration


Ideal for pumps, compressors, and conveyors. Higher cost compared to simpler capacitor-start
motors.
Conclusion:
In summary, the Capacitor Start Capacitor Run Motor is a highly efficient and
reliable single-phase motor commonly used in applications requiring high
starting torque and smooth running performance. By using two capacitors —
one for starting and one for continuous operation — it overcomes the
limitations of simple split-phase or capacitor-start motors. This design not
only improves power factor and efficiency but also ensures better speed
regulation and quieter operation, making it ideal for heavy-duty applications
like compressors, pumps, and refrigeration systems. Understanding its
working principle and advantages helps in selecting the right motor for
various industrial and commercial uses.

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