What is the main difference between a capacitor- start induction -run and a capacitor-start capacitor-run single phase induction motor
The main difference between a capacitor-start induction-run (CSIR) and a capacitor-start capacitor-run (CSCR) single-phase induction motor lies in the usage of capacitors during the operation of the motor.
1. Capacitor-start induction-run (CSIR) motor:
- This type of motor uses a capacitor, connected in series with the starting winding or auxiliary winding, only during the starting phase of the motor.
- Once the motor reaches a certain speed or percentage of its full load speed, the capacitor and the auxiliary winding are disconnected from the main power supply by a centrifugal switch.
- When the motor is running, there is only one winding (main or running winding) energized, making it less efficient in terms of torque and power factor.
2. Capacapacitor-start capacitor-run (CSCR) motor:
- This type of motor has two capacitors – the starting capacitor and the running capacitor.
- The starting capacitor is used only during the starting phase, just like in a CSIR motor. However, the running capacitor remains connected to the auxiliary winding even after the motor reaches its full speed.
- The use of a running capacitor significantly improves the motor's efficiency, torque, and power factor while it is running since both the main winding and auxiliary winding are energized throughout the motor's operation.
In summary, the main difference between a CSIR and a CSCR motor is the use of a running capacitor in the CSCR motor, leading to better performance and efficiency throughout its operation.