three phase converter

E-mail three phase converter enquiries

Single phase to three phase conversion
(3 phase converters, three phase power)

Single to 3 phase converters (misnamed 3 phase transformers) provide three phase power from a single phase supply. Ampair achieves the 3 phase power conversion using an internal motor-generator with 600% overload capability and no electromechanical contacts.

For three phase converters: E-mail by clicking including delivery location so we can use an appropriate currency and estimate transport costs, power required in kW or HP and state if you need to derive single phase from one of the 3 phases and neutral, e.g. for an electronic controller on a CNC machine.

For price list with dimensions and ratings or to purchase on-line, click on Boost-Energy.

Phase converters are ideal for farms, workshops, garages, large buildings, etc. Ampair primarily supplies the UK (Great Britain and Northern Ireland), the Republic of Ireland, Spain, Canary Islands, Ballearic Islands, Hungary, Turkey, Iran and other countries in Europe, Africa and the Middle East. See Business partners for UK, Australia, Canada, USA, Mexico, New Zealand and Pacific Rim. See also 3 phase conversion understanding and selection.


Photograph of phase converters

The Booster™ range is shown in the photograph below. The smallest example covers Boosters™ from 1.5 to 3 kW. The larger enclosure with internal motor covers Boosters™ from 4kW to 8kW. The example with external motor covers Boosters™ of 12kW and 16kW rating.

Three phase converters

General Features of Booster™ single to 3 phase converters

Booster™ A three phase converters will supply a number and variety of loads at full performance. Unlike 'static' phase converters, they are not limited to driving a single motor, nor do they limit the motor's torque or have a lower limit to output power. The Booster™ range of 3 phase converters has the unique feature of electronically switching up to 600 % of rated power for up to 10 seconds for 'hard starting' or momentary overload. Solid state switching takes place as the power waveform crosses zero, minimising electromagnetic interference. There are no electromechanical contacts to wear out or open at full voltage (emitting interference). The Booster™ D range has improved voltage balance between phases and incorporates power factor correction. For an explanation of the principles of 3 phase supplies and a guide to 3 phase converter selection, go to the 3 phase converter understanding and selection page

Booster™ range of single to three phase converters

Economic justification for using a three phase converter

Many properties are, for economic reasons, only connected to one of the three phases of utility power available at the nearest distribution transformer. A single phase supply line was the cheaper option when the premises were built. Similarly, large buildings with 3 phase supplied might still have locations where it is uneconomic or inconvenient to run 3 phase wiring.

If three-phase equipment is to be used, a simple comparison can be made: compare the cost for providing three-phase supply (e.g. distribution transformer, power lines, monthly line charges) with the price of a single to three-phase converter.

Example applications for a 3 phase converter

3 phase converters in woodworking workshops:

3 phase converters in metalworking workshops:

Lathe, Drill, Milling machine, Grinder, Saw, Polisher, Shaper, Guillotines, Press, Welder.

3 phase converters in vehicle servicing:

Post lift, Hoist, Welder, Wheel balancer.

3 phase converters in farming:

Pumps, Compressors, Irrigation systems, Air conditioning, Refrigeration unit, Conveyor, Crane, Hoist, Wine press, Olive oil processor, Grain mill.

3 phase converters in large buildings

Computer installations, print rooms, etc.

Three phase conversion suitability

Booster™ A 3 phase converters are suitable for all the applications listed above. They can run one or many motors. They can be compared with other single to three-phase converters available worldwide, except they electronically switch 600 % rated power for up to 10 seconds and need no maintenance because they have no electromechanical contacts.

Booster™ phase converters are capable of starting many motors simultaneously, even under load. Each motor will reach full speed in the shortest possible time. Motors also maintain their speed when momentarily overloaded.

This unique converter copes well with the most difficult applications: Metal lathes without clutches, hydraulic systems, refrigeration units, wheel balancers, older types of compressors. A Booster™ A will cope with start-stop operation, with forward-reverse and with electric brakes.

The Booster™ A can be used with Variable Speed Drives.

Three phase converter installation

Install a single-phase industrial wall switch-socket combination. Connect your new converter. Now you have three-phase power for all your electric motor and machine tool requirements.

Motor speeds are constant as with a three-phase supply. Starting motors draw high currents. A Booster™ A will produce these currents in order to maintain output voltages. This will draw high input currents for a short time. On the single phase supply side it pays to install heavy cables. This will minimise voltage drop.

Installation instructions and service schematics are provided with each converter. A simple block diagram is shown below.

3 Phase converter block diagram

Booster™ phase converter hard starts and momentary overloads

When an electric motor starts under load, or when a heavy load is applied to a motor, a Booster™ will output up to 600% of its continuous maximum current for up to 10 seconds.

Booster™ A converters cope well with motors starting under load, with motors accelerating large inertia and with pumps and compressors starting against pressure.

A Booster™ A will operate chillers, cranes, conveyors, hoists and vehicle lifts/ramps starting under load. Due to the higher input currents during Boost mode, single phase supply cables to a Booster™ should be oversized. The resistance per unit length of the cable should be multiplied by the length and by the maximum current to provide the voltage drop. As a rough guide, this should not exceed 10V at peak current.

Booster™ three phase converter efficiency

Efficiency is highest (max. 90%) at a load between 20% and 90% of the rated power. Above and below this range, efficiency is slightly lower. Running idle, a Booster™ will consume about 5% of its rated power.

Booster™ 3 phase converter reliability

Boosters™ are totally maintenance-free. Internal motor-generators are brushless and bearings are greased for life.

Boosters™ do not have any life-limiting components such as contacts, contactors or electrolytic capacitors. Internal logic is CMOS, which stays cool even under heavy loads.

Boosters™ are robust and immune from incoming line disturbances, over- or undervoltage conditions and short circuits.

The life of a unit is at least 10000 hours before any component needs to be replaced. The warranty period on Boosters™ is three years free parts replacement.

Maximum continuous ambient temperature is 50 degrees C.

Booster™ three phase conversion with welders

Boosters™ are designed to run induction motors most efficiently. Welders can also be operated but the converter size should be chosen to be larger than the welder input power by 50%. If no power rating is shown then multiply the welding current by 50 for A series converters or by 30 for D series converters. The result will be the converter power rating in Watts for 100 % duty factor, often misnamed duty cycle.

EMC and Safety with Booster™ 3 phase converters

Radio frequency interference and electromagnetic interference are well below legal limits everywhere. Boosters™ are tested for EMC compliance and comply with applicable emission and radiation standards. Boosters™ comply with Wiring and Safety Regulations.

Booster™ phase converter robustness

Boosters™ are robust and immune from incoming line disturbances, over- or undervoltage conditions and frequent short circuits. They resist the "dirty" supply from rural power lines. Brown-outs, black-outs, unstable power lines, over and under voltage will not harm a Booster™.

Booster™ phase converter options

The standard input voltage is 220-240V single-phase and the standard output voltage is 380-415V 3phase. The output frequency is always as the input frequency: 47-63 Hz. Boosters™ are also available for other single phase, two phase or split phase input voltages such as 110-127V, 208V, 400V, 460V or 480V.

Business partners around the world

Customers in the UK, Europe and the Middle East should contact our business partner Ampair Energy Ltd
Tel: +44 (0)1258 837 266    Fax: +44 (0)1258 837 496

For customers in Asia, New Zealand, Pacific Islands, etc. we suggest you approach our business partner Eurotech Ltd
Tel: +64-7-8237 234     Fax: +64-7-8237 346

For customers in Australia, we suggest you approach our business partner Peter Martin Sales PTY LTD
Tel: (07)-1879 7844

For customers in the USA or Canada, we suggest you approach our business partner Martin's Electrical Services
Tel: (570) 668-4540

For customers in Mexico, we suggest you approach our business partner Blantek SA DE CV
Tel: 0112 01-1491

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3 phase convertor page (mis-spelling of converter)

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