Best single phase to 3 phase converters

A phase converter is required to run three-phase equipment with a single-phase power source.

There are primarily two types of load distribution systems in electricity: single-phase and three-phase power systems.

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How do the two differ?

A single-phase power is an alternating current (AC) power circuit with two wires, typically one phase wire (live wire) and one neutral wire. It is a method of distributing alternating current electricity in which all supply voltages vary significantly in parallel. Through the use of a converter, a three-phase system may power a single-phase one. A single-phase power supply usually serves most residential homes and domestic households’ electrical units.

On the other hand, a three-phase system is a three-wire alternating current circuit with a third voltage line. More large power users, such as stores, buildings, establishments, apartment complexes, and industries, need the appropriate power distribution system.

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The significant difference between a single vs. a three-phase power system:

Load capacity Power generation System configuration

Load capacity

One significant difference between a single and a three-phase power system is their load capacity. Because three-phase electricity has a higher load capacity. It can support more oversized electrical loads than a single-phase system, which can only power standard lights, heating, and equipment with smaller electric motors.

Power generation

A three-phase power can deliver more consistent electricity than a single one can. Because a single-phase system produces higher voltage peaks and dips, it cannot provide a stable and consistent power rate. Furthermore, a three-phase power system could generate three times the power of a the other system. A single-phase system usually provides electricity at 220-240 volts with a maximum current of 100 amps. A three-phase power system is a poly-phase system, and it is the most popular method for powering large motors and high loads.

System configuration

In terms of configuration, both types are pretty distinct. A single-phase power supply is formed by two wires, typically the live and the neutral. Three-phase power supplies, on the other hand, are arranged in wye and delta designs. Compared to the delta, which only has three wires, the wye has a fourth neutral wire.


Converting the power necessitates using the best single options on the market.

A converter is a device that transforms one type into the other. A converter generates a third voltage line, allowing it in a single-phase unified framework. Three-phase equipment in a site with only single-phase electrical service is already possible with a converter.

A large percentage requires a three-phase converter of commercial and industrial electrical equipment. Some domestic residences and rural establishments may not have access to three-phase energy or may not want to pay the additional expenses for acquiring a three-phase service. Some local communities are still served by single-phase power. It is because their local electric suppliers are reluctant to extend different lines to such a remote area. Single-phase users prefer three-phase because it can provide a higher quality of electricity to power their types of equipment smoothly.

Just because three-phase power is more expensive, a converter is often used to create three-phase energy.

Today, there are three types on the market: rotary ones, static ones, and sine wave electrical inverters.

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About rotary converters

A rotary phase converter can operate three-phase equipment at peak load from a single-phase power supply. It is the most common and widely used form of the phase converter. Using the three-phase power from the single-phase source creates a reliable and balanced three-phase power output.

The idler generator is driven by single-phase electricity spinning a rotating mass. Then, the rotating mass creates a third power line connected to the two flows of a single-phase line to form a three-phase current. The control panel includes a start circuit to allow the idler generator to start/stop and regulate voltage levels.

Any motor load, including resistive and inductive loads, may be powered by a rotary converter.

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The three types

Standard rotary converter Static converter Sine wave electrical inverter

#1. The standard rotary converter

The standard rotary converter is a Pro-Line (PL) with a digital start circuit or digital control panel connected to an idler generator.

Next is the digital rotary converter: It also has a digital control panel with extra functions such as current boost mode (Smart-Boost) and active voltage balancing, also known as (Smart-Phase).

The rotary converter control panel is the third option, which includes a digital control panel but requires the user to supply the idler motor.

#2. Static r

The voltage-sensitive relay and capacitor/s are the two components of a static converter. Once the motor has reached full speed (RPM), the relay switches the two capacitors, and they are separated. And the engine continues to run and is still powered by a single-phase source.

It is reasonably cheap and only applicable on three-phase motor loads, commonly found in home shops and small businesses. However, it is not suitable for computer numerical control (CNC) equipment, which requires a constant and accurate power supply.

#3. Sine wave electrical inverter

An electrical inverter converts direct current (DC) to alternating current (AC), resulting in a DC to AC system. When a sine wave inverter is connected to a battery (DC), it converts the energy to a three-phase alternating current (AC). It enables you to power tools remotely or when you are not connected to a power outlet.

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Variable frequency drive (VFD)

Using the inverter component, it generates an alternating current (AC) at virtually any required frequency and simulates most of the characteristics found within a three-phase motor.

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Frequently Asked Questions (FAQ)

1. Can you convert from one to the other?

Yes, if you have larger equipment with a three-phase motor but no quick access to three-phase power, a converter is required to convert into the right power. Static, rotary, and inverter converters are readily available. These types of converters are pretty essential to have, primarily if you regularly deal with power-hungry tools and equipment.

2. Can 3-phase be converted?

There are several solutions for converting it, one of which is known as single-phasing. It entails rewinding electric motors with capacitors for a three-phase engine to run on a single-phase 220v power supply. The power enters by three symmetrical sine waves in this manner.

A VFD, or variable frequency drive converter, is another option. The use of this technology allows you to regulate a motor that runs at variable speeds. A single-phase to 3-phase VFD is necessary for a 3-phase motor running on a single-phase power source (220v, 230v, 240v). Aside from the engine operating smoothly at full speed, based on its actual rate, the capacity of a VFD is adjusted.

Another alternative is to get a frequency phase converter that converts single-phase to three-phase with modified sine wave output. It is excellent for industrial-sized equipment with big motors that require high-quality power. It is substantially more expensive, yet it is worthwhile to have a device.

3. What is a 3-phase converter?

A 3-phase converter is required if the distribution of the current load does not match the phase available. In other words, a 3-phase converter is to run equipment with a 3-phase motor in a location where only a single-phase power source is open. A three-phase supply is more consistent and dependable, making it better able to handle greater loads.

4. How big of a converter do I need?

If you want to have a 3-phase electrical supply in your property to carry out the necessary work in your present power supply in your property or shop, you will need 3-phase electricity.

A single-phase may be enough in small enterprises with modest power consumption, while a 3-phase is more continual and safe in businesses with high electrical demand.

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Keep the following in consideration while determining the proper size:

  • Determine how many pieces of equipment you need to convert and their power requirements (watts, kilowatts, or amperage), as well as the amount of power each piece of equipment requires.
  • The amount of electricity required by the phase converter should be more than the total power of all your equipment. Use a more extensive phase converter to complete all required tasks.
  • Consider the amount of space necessary for the phase converter to install. To transfer between machines, you may only need a portable-type phase converter. Or a fixed-type configuration to several power units.
  • Anticipate the start load and the run load for each piece of equipment and double the horsepower (HP). The start load is frequently double the voltage of the run load. For example, if you have a 50HP 3-phase machine, you’ll need a 100HP phase converter to power it.
  • If you are unsure about the size of a 3-phase converter you need for your operations, consulting a specialist is the best choice. Professional electricians can help you make the best decision.

5. How much does a 3 phase converter cost?

A three-phase converter is often less expensive than single-phase power and sine wave inverters. Having a 3-phase converter eliminates the need to worry about the high cost of bringing in 3-phase electric power with minor use requirements. The wire needed to produce a three-phase connection is less expensive than a typical single-phase connection. Furthermore, fewer components are required to provide electricity. The standard price of a 1ph-3ph converter on the market is from $135 to $285, depending on the manufacturer. Some brands may cost up to $400 or more. And the standard cost of converting single-phase power lines to three-phase services is now $7 to $10 per linear foot. After all, the amount of power you require is entirely dependent on how much money you are willing to pay.

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Best converters

#1. DPS converter

The digital phase shifter drives a 3-phase motor with a 1-phase 220v power supply.

A standard 1-phase motor used at home has difficulties with centrifugal force switch connections wearing out during startup. Sparks cause a fire, and production costs rise as compared to a three-phase motor. The good news is that a DPS device is the best solution for eliminating such issues. Its small size allows easy installation and a wide range of applications in machines that require high startup motor torque.

This machine is compatible with nearly all items powered by a three-phase motor, including:

  • Industrial and domestic equipment and tools
  • Hoists
  • Compressors
  • Conveyor motors
  • Food processing machines
  • Agitators
  • Paper shredders
  • Hydraulic motors
  • Agricultural, woodworking machines
  • Meat slicers
  • Plumbing machines
  • Portable AC
  • Fan motors and blowers
  • Ceramic machines
  • Cutters
  • Packaging machines, etc.

DPS converters have a reduced failure rate, a smaller size, more efficiency, and are less expensive than their counterparts, and can be used at home or in the workshop. It is non-thermal and completely sealed to withstand dust, moisture, and heat.

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#2. American Rotary (AR series)

By creating quality products, American Rotary aspires to provide innovation and great power solutions to enable their consumers’ goal of reliable power realized.

For over 20 years, American Rotary has been producing high-quality rotary converters. In terms of innovation and design, they have been at the forefront of the industry. To guarantee that its goods fulfill the needs of its customers, the firm employed high-quality components. They have demonstrated technologically advanced features for improved dependability and precise voltage balancing of unmatched conversion.

The American Rotary product works well and is quiet, quick, and simple to install. The AR series delivers utility-grade power capable of supporting nearly any equipment.

The AR rotary converter provides utility-grade power and is designed for light/medium duty general purpose loads such as drill press, table saw, etc.

The product features:

  1. Magnetic starter – is ideal for remote access of the phase converter from different locations or in combination with automated types of equipment.
  2. Quality technology – This device is engineered with cutting-edge technology to deliver outstanding performance and ease of use.
  3. Versatile lock design – Because some equipment is not hard-wired, the product’s expandable design allows for installing a twist-lock 3-phase receptacle or 3-phase flush mount breaker.
  4. Easy installation – Because of its detachable sides, the device takes up as little room as possible while allowing easy access to the large terminal blocks.

The American Rotary phase converter is a reliable option for powering your three-phase equipment. The electricity generated by the AR rotary phase converter is cleaner and more steady. Apart from being manufactured in the United States, it is adorable and quiet, operates well, and takes minimal space.

#3. Phase-A-Matic

Phase-A-Matic, Inc. began making phase converters in 1968, and as sales quickly increased by the early 1970s, the business continued to develop its products. Until now, they have been able to deliver high-quality products at reasonable rates because of innovative manufacturing techniques.

The Phase-A-Matic rated static converter delivers low-cost three-phase electricity for the home, workshop, and industrial applications. It has a rugged casing and a big connector box for ease of installation. It drives 3-phase motors at varying HP rates. It has been created, tested, and well-accepted for years to prove extraordinarily high performance and extended life. The product is well-known for being a workhorse for a variety of commercial and home shop machines.

#4. CN Weiken

The CN Weiken company, based in China, has been focused on the research and development of inverter drive control technology and is dedicated to providing clients with innovative industrial automation products and solutions.

The device uses third-generation vector technology for high performance, sophisticated features, and extensive setup. It is suitable for various applications, including spindle motors, drilling machines, pumps, conveyors, HVAC systems, and many more.

Advantages of a converter

  1. The circuit’s output provides balanced 3-phase electricity to a 3-phase motor from single-phase lines.
  2. The starting power required is significantly less than that needed for a single-phase motor in a balanced three-phase line.
  3. Throughout the operating range, the power factor is enhanced.
  4. The starting torques are comparable to those of a single-phase motor, which is a plus.
  5. Start-up kilovolt-amper (Kva) per foot-pound is much lower than a single- or three-phase motor of the same horsepower rating.
  6. A 3-phase motor converter cost less than a single-phase motor.
  7. In addition, the simplicity of a 3-phase converter lowers the amount of maintenance required.
  8. Phase converters may one into the other, allowing 3-phase motors to be utilized straight from a single-phase line at 82 percent efficiency.
  9. Converter units with stated horsepower ratings can be used with motors with lower horsepower ratings.

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If you made it through, congratulations. We appreciate your interest in reading our post about the best single-phase to 3 phase converters. You might be interested in checking the best watt generators as well.

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