Start Capacitor Motor Diagram: Understanding the Basics
A start capacitor motor is a type of singlephase induction motor that uses a capacitor to increase the starting torque of the motor. This type of motor is commonly used in applications such as refrigeration compressors, air conditioners, and pumps. In this article, we will explore the start capacitor motor diagram and its working principle.
How a Start Capacitor Motor Works
A start capacitor motor consists of a singlephase induction motor and a capacitor connected in series with the motor winding. The capacitor is used to create a phase shift between the voltage and current of the motor, which increases the starting torque of the motor.
Here is a stepbystep explanation of how a start capacitor motor works:
Step 1: Starting the Motor
When the motor is started, the capacitor is connected in series with the motor winding. The capacitor creates a phase shift between the voltage and current of the motor, which increases the starting torque of the motor.
Step 2: Running the Motor
Once the motor reaches a certain speed, the capacitor is disconnected from the circuit using a centrifugal switch or a relay. The motor then runs on the singlephase supply, and the capacitor is no longer needed.
Start Capacitor Motor Diagram
Here is a simplified diagram of a start capacitor motor:
++
 AC Power 
 (SinglePhase) 
++


v
++
 Capacitor 
 (Start Capacitor) 
++


v
++
 Motor Winding 
 (SinglePhase) 
++


v
++
 Centrifugal 
 Switch or Relay 
++
Components of a Start Capacitor Motor Diagram
Here are the main components of a start capacitor motor diagram:
1. AC Power
The AC power supply is the input power to the motor. It is a singlephase supply.
2. Capacitor (Start Capacitor)
The capacitor is used to create a phase shift between the voltage and current of the motor. It is connected in series with the motor winding.
3. Motor Winding (SinglePhase)
The motor winding is the main component of the motor. It is a singlephase winding.
4. Centrifugal Switch or Relay
The centrifugal switch or relay is used to disconnect the capacitor from the circuit once the motor reaches a certain speed.
Advantages of Start Capacitor Motor Diagram
Here are some advantages of a start capacitor motor diagram:
1. High Starting Torque
The start capacitor motor diagram provides high starting torque, which is essential for applications that require high starting torque.
2. Simple and CostEffective
The start capacitor motor diagram is simple and costeffective compared to other types of motors.
3. Reliable and Efficient
The start capacitor motor diagram is reliable and efficient, making it suitable for a wide range of applications.
Conclusion
In conclusion, the start capacitor motor diagram is a simple and costeffective way to increase the starting torque of a singlephase induction motor. It is widely used in applications such as refrigeration compressors, air conditioners, and pumps. By understanding the working principle and components of a start capacitor motor diagram, you can design and implement efficient and reliable motor systems.