What is the difference between a single-phase and a three-phase motor?

When you don't often encounter electric motor use or aren't regularly faced with electric motor repair, it can sometimes be difficult for you to make this distinction. Many customers ask us: what is the difference between a single-phase and three-phase motor? Dymatec Industries offers this article to answer this recurring question.

Single-phase motor, also called 220v electric motor: in what cases?

First of all, a single-phase motor, also known as a220v electric motor, operates with single-phase voltage. This is the most common voltage for individuals. It consists of only one phase and a neutral.

A 220v electric motor is perfectly suited for domestic applications powered by single-phase 220/230V. These are mainly applications with low power. For example, it can power:

• Compressors
• Car garage lifts
• Mechanical reducers for sectional doors
• Pumps
• Fans
• Log splitters
• Drill presses
• Concrete mixers
• Conveyors

A single-phase motor is always accompanied by one or two capacitors:

Either a permanent capacitor: this is a capacitor that remains throughout the operation of the single-phase electric motor. It is ideal for applications requiring low resistive torque at start-up.

Or a dual capacitor: a permanent capacitor and a starting capacitor. The latter is only used when starting your 220v electric motor. As soon as it starts, the starting capacitor cuts off.

It is ideally suited for applications requiring greater resistive torque for starting, meaning they need more energy or force to get going. They are generally used for compressors and car garage lifts.

To put it simply, to know what the difference is between a single-phase and three-phase motor, you can check if your motor has a capacitor or not.

Find our range of 220v electric motors here.

Three-phase motor: when to use it?

Regarding a three-phase motor, it operates with three-phase voltage, which is the most commonly used in industry. It consists of 3 phases.

A three-phase motor is ideal for applications requiring 3 phases. These are frequently applications with more power, unlike a single-phase motor.

It can power all types of industrial and agricultural applications such as:

• Machine tools
• Gear motors
• Grinders
• Fans
• Hydraulic pumps
• Centrifugal pumps
• Industrial machinery
• Agricultural machinery

Dymatec Industries supplies Gamak three-phase motors. Find our range here.

Throughout this reading, you have found the answer to the question of what the difference is between a single-phase and three-phase motor. Thus, everything depends on your application, the power supply voltage, and the power required by that application.