Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors
Capacitor Start-capacitor Run Induction Motor
Construction, Working Principle, Circuit Diagram, Characteristics, Applications
Construction, Working Principle, Circuit Diagram, Characteristics, Applications of Capacitor Start-capacitor Run Induction Motor
CAPACITOR
START‒CAPACITOR RUN INDUCTION MOTOR
This motor is identical
to a capacitor‒start motor except the fact that the starting winding is not
opened after starting so that both the windings remain connected to the supply
when running as well as at starting. Two designs are generally used.
(i) In one design, a
single capacitor C is used for both starting and running as shown in Fig. 5.30 (i).
The design eliminates the need of a centrifugal switch and at the same time
improve the power factor and efficiency of the motor.
(ii) In the other
design, two capacitors C1 and C2 are used in the starting
winding as shown in Fig. 5.30. (ii). The smaller capacitor C1
required for optimum running conditions is permanently connected in series with
the starting winding. The much larger capacitor C2 is connected in
parallel with C1 for optimum starting and remains in the circuit
during starting. The starting capacitor C2 is disconnected when the
motor approaches about 75% of synchronous speed. The motor then runs as a
single‒phase induction motor.
Characteristics of capacitor‒start capacitor run motors are,
1. The starting winding
and the capacitor can be designed for perfect 2‒phase operation at any load.
The motor then produces a constant torque and not a pulsating torque as in
other single‒phase motors.
2. Because of constant
torque, the motor is vibration free
Applications of Start Capacitor Run Induction motor
1. Hospitals
2. Studios and
3. Other places where
silence is important
Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors : Tag: Basic Engineering : Construction, Working Principle, Circuit Diagram, Characteristics, Applications - Capacitor Start-capacitor Run Induction Motor
Basic Electronics and Electrical Engineering: Chapter 5: Induction Motors
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Basic Electronics and Electrical Engineering
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