Draw A Wiring Diagram Of A Capacitor- Start–capacitor-run Motor

5 min read Jun 26, 2024
Draw A Wiring Diagram Of A Capacitor- Start–capacitor-run Motor

Capacitor-Start-Capacitor-Run Motor Wiring Diagram

A capacitor-start-capacitor-run motor is a type of single-phase induction motor that uses two capacitors to improve its starting and running performance. This motor is commonly used in air conditioning compressors, refrigerators, and other appliances. In this article, we will draw a wiring diagram for a capacitor-start-capacitor-run motor.

Components Used

  • Motor: A single-phase induction motor with a main winding and an auxiliary winding.
  • Capacitor C1: A starting capacitor used to provide a high voltage to the auxiliary winding during starting.
  • Capacitor C2: A running capacitor used to improve the motor's running efficiency and power factor.
  • Switch S1: A centrifugal switch or a relay used to disconnect the starting capacitor C1 from the circuit once the motor reaches a certain speed.
  • Power source: A single-phase AC power supply.

Wiring Diagram

Here is the wiring diagram for a capacitor-start-capacitor-run motor:

Motor Windings

  • Main Winding: Connected to the power source (L1 and L2) and the running capacitor C2.
  • Auxiliary Winding: Connected to the power source (L1 and L2), the starting capacitor C1, and switch S1.

Capacitor Connections

  • Starting Capacitor C1: Connected in series with the auxiliary winding and switch S1.
  • Running Capacitor C2: Connected in parallel with the main winding.

Switch S1 Connection

  • Switch S1: Connected in series with the starting capacitor C1 and the auxiliary winding. The switch is normally closed during starting and opens once the motor reaches a certain speed.

Power Source Connection

  • Power Source (L1 and L2): Connected to the main winding and the auxiliary winding.

Here is the wiring diagram:

       +---------------+
       |  Power Source  |
       |  (L1 and L2)   |
       +---------------+
                  |
                  |
                  v
+---------------+       +---------------+
|  Main Winding  |       |  Running Capacitor  |
|  (L1 and L2)   |       |  (C2)             |
+---------------+       +---------------+
                  |                       |
                  |                       |
                  v                       v
+---------------+       +---------------+
|  Auxiliary Winding  |       |  Starting Capacitor  |
|  (L1 and L2)       |       |  (C1)               |
+---------------+       +---------------+
                  |                       |
                  |                       |
                  v                       v
+---------------+       +---------------+
|  Switch S1        |       |  (Normally Closed)  |
+---------------+       +---------------+

How it Works

During starting, the starting capacitor C1 is connected in series with the auxiliary winding and switch S1. The high voltage from C1 helps to create a rotating magnetic field, which induces a current in the main winding. As the motor reaches a certain speed, switch S1 opens, disconnecting C1 from the circuit.

Once the motor is running, the running capacitor C2 is connected in parallel with the main winding, improving the motor's power factor and efficiency. The running capacitor also helps to reduce the current in the main winding, which reduces the motor's heat and increases its lifespan.

By using two capacitors, the capacitor-start-capacitor-run motor provides a reliable and efficient way to start and run single-phase induction motors.