Schematic Diagram Of Single Phase Capacitor Start Motor

5 min read Jun 26, 2024
Schematic Diagram Of Single Phase Capacitor Start Motor

Schematic Diagram of Single Phase Capacitor Start Motor

Introduction

A single phase capacitor start motor is a type of induction motor that uses a capacitor to improve its starting torque. It is widely used in applications such as refrigeration compressors, air conditioners, and washing machines. In this article, we will discuss the schematic diagram of a single phase capacitor start motor and its working principle.

Schematic Diagram

The schematic diagram of a single phase capacitor start motor is shown below:

      +---------------+
      |            |
      |  Capacitor  |
      |  (Start)    |
      +---------------+
                  |
                  |
                  v
      +---------------+
      |            |
      |  Switch    |
      |  (Start/Run) |
      +---------------+
                  |
                  |
                  v
      +---------------+
      |            |
      |  Motor    |
      |  (Main)    |
      +---------------+
                  |
                  |
                  v
      +---------------+
      |            |
      |  Capacitor  |
      |  (Run)     |
      +---------------+

Components

The schematic diagram of a single phase capacitor start motor consists of the following components:

Motor (Main)

The main motor is a single phase induction motor that uses a squirrel cage rotor and a stator with a single phase winding.

Capacitor (Start)

The start capacitor is a temporary capacitor that is connected in series with the motor during the starting period. It provides a high starting torque to the motor.

Switch (Start/Run)

The start/run switch is a automatic switch that disconnects the start capacitor from the motor circuit once the motor reaches a certain speed.

Capacitor (Run)

The run capacitor is a smaller capacitor that is connected in series with the motor after the start capacitor is disconnected. It provides a reactive component to the motor circuit to improve its efficiency.

Working Principle

The working principle of a single phase capacitor start motor is as follows:

  1. Starting: When the motor is switched on, the start capacitor is connected in series with the motor. The start capacitor provides a high starting torque to the motor, allowing it to quickly reach its operating speed.
  2. Running: Once the motor reaches a certain speed, the start/run switch disconnects the start capacitor from the motor circuit and connects the run capacitor instead. The run capacitor provides a reactive component to the motor circuit, improving its efficiency and reducing the current drawn from the supply.

Advantages

The advantages of a single phase capacitor start motor include:

  • High starting torque: The start capacitor provides a high starting torque to the motor, allowing it to quickly reach its operating speed.
  • Improved efficiency: The run capacitor provides a reactive component to the motor circuit, improving its efficiency and reducing the current drawn from the supply.
  • Simple and reliable: The single phase capacitor start motor is a simple and reliable design that is widely used in many applications.

Conclusion

In conclusion, the schematic diagram of a single phase capacitor start motor is a simple and reliable design that is widely used in many applications. The motor uses a temporary start capacitor to provide a high starting torque and a smaller run capacitor to improve its efficiency. Its advantages include high starting torque, improved efficiency, and simplicity.