# Capacitor Size To Run 3 Phase Motor On Single

By | June 22, 2015

# Capacitor Size To Run 3 Phase Motor On Single

Starting a three phase motor on single phase requires the use of an auxiliary device, usually a capacitor. This capacitor assists in the distribution of electrical power between the three phases and creates an initial current in the rotor of the motor, so that it can start up and run efficiently. The size of the capacitor is dependent upon the characteristics of the motor, as well as the efficiency of the motor. In this article, we will discuss the capacitor size to run a three phase motor on single and the factors influencing it.

## What is the Capacitor Rating?

The capacitor rating is determined by the motor characteristics. It is important to note that the rating of the capacitor should always be greater than the full load current rating of the motor. A higher rated capacitor will ensure that the motor starts with ease, and that it runs efficiently without overheating or other damage. In order to calculate the motor’s full load current, the following formula can be used:

Full Load Current = [KW x 1000] / [Voltage x Efficiency x Power Factor]

## Factors Influencing the Capacitor Size to Run 3 Phase Motor on Single

There are several factors that influence the size of the capacitor needed to run a three phase motor on single phase. These include the voltage and the efficiency of the motor, the full load current rating of the motor, and the type and size of the capacitor.

### Voltage and Efficiency

The voltage and efficiency of the motor will have a direct effect on the capacitor size needed to run a three phase motor on single. A higher voltage, such as 220 volts, will require a larger capacitor than a lower voltage, such as 120 volts. Similarly, a higher efficiency motor will require a larger capacitor than a lower efficiency motor.

The Full Load Current rating of the motor determines the maximum amount of current that is required to maintain the motor's efficiency. The full load current rating must be greater than the capacitor’s rating for it to function properly. If the full load current rating is too low, the motor may not start, or it may run inefficiently and overheat.

### Type and Size of the Capacitor

The type and size of the capacitor also affect the size of the capacitor needed to run a three phase motor on single. There are two main types of capacitors available: fixed and adjustable. Fixed capacitors are typically larger and more expensive than adjustable capacitors, but they provide a more consistent performance. Adjustable capacitors are smaller and less expensive, but they are also less reliable and require frequent adjustments.

In conclusion, the size of the capacitor needed to run a three phase motor on single depends on the characteristics of the motor and the type and size of the capacitor. It is important to choose the correct size capacitor to ensure that the motor runs efficiently and consistently without overheating or other damage.

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