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Three Phase to Single Phase Electric Motor Conversions

We specialise in converting 3 phase motors to single phase on applications such as Bradbury Car Lifts, Startrite Circular Saws, Myford/Boxford Lathes & Compressors

Bradbury Car Lift Motor Conversions

Bradbury Car Lift Motor Conversions

Need to convert a 3-phase car lift to run from a 230V single-phase supply?

We have supplied replacement single-phase motors for 2 post & 4 post hydraulic and screw, pulley/belt-driven car lifts, including Bradbury, Tecalemit and other leading car lift brands.

Myford/Boxford Lathe Motor Conversions

Myford/Boxford Lathe Motor Conversions

Looking to convert a Myford, Boxford or Colchester lathe from three phase to single phase?

We have supplied replacement motors for Myford ML7, Super 7 and other Myford models, plus Boxford and Colchester lathes.

Startrite Bandsaw/Circular Saw Motor Conversions

Startrite Bandsaw/Circular Saw Motor Conversions

Need to convert a 3-phase circular saw or table saw to single phase?

We help workshop, school and joinery customers select a suitable high-starting-torque motor for Startrite, Wadkin, Sedgwick and other woodworking machines.

Three Phase to Single Phase Electric Motor Conversions

Converting equipment from 3-phase to single-phase power? You're in the right place.

MM Engineering Services specialises in converting three-phase motors to single-phase replacements—and we've successfully done this for thousands of industrial machines, car lifts, lathes, pillar drills, table saws, and workshop equipment.

Unlike generic online forums or mass-market retailers, we understand the specific requirements of each machine type. A conversion solution for a car lift is completely different from a lathe—and we solve both correctly the first time.

When Conversion Makes Sense:

✅You have single-phase power only (230V) at your premises
✅Your equipment is three-phase (400V)
✅You want to avoid the cost of three-phase installation (£2,000-5,000 from your energy supplier)
✅The equipment is worth keeping (car lifts, high-quality lathes, industrial drills)

When Conversion Doesn't Make Sense

❌If equipment is already single-phase – no conversion needed
❌If you're discarding the equipment – not worth the investment
❌If you have three-phase power available – use it as-is (more efficient)
❌If multiple three-phase motors need converting – consider three-phase installation instead

Two Conversion Methods Compared

Choosing the right type of single phase motor depends on your starting torque requirements and application.

Single Phase Motor Replacement **Most Common**

What it is: Replace the three-phase motor with a direct equivalent single-phase motor.

  • ✅ Most cost-effective
  • ✅ Simplest installation
  • ✅ Best long-term reliability (no external converters needed)
  • ✅ No ongoing maintenance (motor is all you need)
  • ✅ Faster speed availability (most sizes in stock, same-day delivery available)
  • ✅ Excellent support (we've installed thousands of these)
  • ❌ Limited power range (single-phase motors max out at ~3.7kW / 5HP in UK)
  • ❌ Higher starting current (domestic circuit breaker needs replacing to Type C)
  • ❌ No speed control

Phase Converter ** Best for Speed Control

What it is: An electronic device that converts single-phase 230V power into three-phase 400V power electronically.

  • ✅ No motor replacement needed (keep original equipment - must be 230/400V)
  • ✅ Variable speed control (run motor at any speed from 0-100%)
  • ✅ Soft starting (gradual acceleration reduces shock)
  • ✅ Protection features (thermal overload, phase failure protection)
  • ✅ Compact
  • ❌ ALOT Higher cost than single phase motor replacement
  • ❌ More complex installation
  • ❌ Loss of torque and power
  • ❌ Not ideal for all equipment (some equipment designed for fixed speed)

2 Post & 4 Post Hydraulic & Screw Type Car Lift Motor Conversion - A Complete Guide

MM Engineering Services has supplied replacement single-phase motors for a wide range of car lifts originally fitted with three-phase motors. Our experience includes 2 Post & 4 Post Bradbury hydraulic car lifts and Tecalemit screw- and pulley-driven lifts and many other car lift brands.

If you only have a single-phase electricity supply, contact us with your lift details and photographs of the existing motor. We can help identify a suitable replacement, subject to checking the motor specification, mounting arrangement and application.

Bradbury Hydraulic Car Lift Motor Replacements
If your Bradbury car lift has an older Newman 2hp, approximately 2800rpm three-phase motor with a 5/8-inch shaft, we stock a single-phase replacement option. This replacement is intended to fit the original motor position and connect to the existing hydraulic pump, subject to confirming the shaft, mounting dimensions and pump coupling.

ASEA and ABB motors (e.g. Bradbury 40 Series)
We also stock single-phase replacement options for selected Bradbury lifts fitted with 1.5kW, approximately 2800rpm ASEA or ABB three-phase motors carrying these references:

MT80B19F165-2
MT90B24F165

We always use our 2.22-90-IE2-B5-CC to replace the Asea/ABB Three phase motors, and then get our workshop to modify the shaft from 24mm to 19mm if needed.

Tecalemit and Other Screw- or Pulley-Driven Car Lift Conversions
We always recommend using a 3.7kW 1500rpm High Start/Running Torque motor such as our 3.74-112-IE2-B3-CC to cover the starting torque losses when moving from 3phase to 1phase as the lift is completely reliant on the electric motor for its torque.

Why We Use Capacitor-Start/Capacitor-Run Motors
We always use the capacitor start/capacitor run single phase motors (also called CSCR or dual-capacitor motors) which are designed with two capacitors and allow them to deliver the highest starting torque of any single phase motor type – typically 1.8-2.5 times the rated torque. This makes them essential for applications with high inertia loads or where the motor must start under load e.g. Car Lift, Compressors or Conveyor.

Need Help Identifying Your 2 Post/4 Post Car Lift Motor?
To help us assess a three-phase-to-single-phase car lift conversion, please send:

- A clear photograph of the existing motor nameplate and the complete motor to allow us to see the mounting arrangement.

Call 01274 288777, email sales@mmengservices.co.uk or WhatsApp us with your photographs.

Our most popular Car Lift Motors - 2.2kW (3hp) - Hydraulic Driven Car Lifts & 3.7kW (5hp) - Screw/Pulley-Belt Driven Car Lifts
IE2 Efficiency
Motor Monofásico Amtecs 2.2kW (3CV) 2 Polos (3000 rpm) Carcaça 90
Esgotado
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Motor Monofásico Amtecs 2.2kW (3CV) 2 Polos (3000 rpm) Carcaça 90

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Motor Monofásico Amtecs 2.2kW (3CV) 2 Polos (3000 rpm) Carcaça 90
£237.72Inc VAT £198.10 Ex VAT
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IE2 Efficiency
Motor Monofásico Amtecs 3,7kW (5HP) 4 Polos (1500 rpm) Carcaça 112
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Motor Monofásico Amtecs 3,7kW (5HP) 4 Polos (1500 rpm) Carcaça 112

amtecs
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Motor Monofásico Amtecs 3,7kW (5HP) 4 Polos (1500 rpm) Carcaça 112
£398.44Inc VAT £332.04 Ex VAT
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Myford and Boxford Lathe Motor Conversions: Three Phase to Single Phase

MM Engineering Services has supplied replacement single-phase motors for a wide range of metalworking lathes fitted with three-phase motors. Our experience includes the Myford & Boxford lathe
ranges including the Myford ML7, Super 7, ML7R or ML10, or a Boxford AUD, BUD
or CUD, and many other lathe brands.

If your workshop only has a 240V single-phase electricity supply, we can help identify a suitable replacement lathe motor. Send us your lathe model and photographs of the existing motor, nameplate and mounting arrangement so we can check the options before you order.

Replacement Motors for Older Myford and Boxford Lathes
Older lathes may be fitted with motors carrying Brook Crompton or Crompton Parkinson branding, or Gryphon and Cub range names.

Examples we have encountered include imperial-frame motors
with:

- 5/8-inch shaft diameter, approximately 15.9mm.
- Shaft length of approximately 2 inches, or 50.8mm.
- Running speed around 1425rpm.
- Power ratings from approximately 1/4hp (0.18kW) to 3/4hp (0.55kW).

These details vary between machines, and some lathes have had their original motors replaced. We therefore check the motor nameplate and physical dimensions rather than selecting a replacement from the lathe model alone.

B56 Imperial-Frame Single-Phase Lathe Motors
For suitable applications, we supply B56 imperial-frame single-phase replacement motors designed to match the original motor’s mounting and shaft arrangement.

Our replacement options include drip-proof motors with a nominal 5/8-inch shaft and approximately 2-inch shaft extension. Before recommending a motor, we confirm the shaft height, shaft diameter and length, mounting dimensions, power and speed.

The B56 Imperial motor we most often use is a 550W 1425rpm CapStart Foot or Resilient Base Mounted 230V  with a 5/8" Dia Shaft x 90mm Length (Our Part number 604550MRBCS) - £ 214.84 + Shipping + VAT. We have other variations which include , no capacitor, resilient ring mount, 1/2" diameter shaft, B56 Flange plate as well as the ability to make a special mounting plate in our workshop to your original specification.

Matching these details can help retain the existing pulley and drive arrangement, subject to checking compatibility with the individual lathe.

Selecting a Motor for Your Lathe’s Operating Requirements
A suitable replacement must match how the lathe is used as well as its physical dimensions.

We assess the starting load, expected start/stop frequency, reversing requirements and existing controls before recommending a motor. The motor’s starting arrangement and rated duty must be appropriate for the application.

Need Help Identifying Your Lathe Motor?
To help us assess a three-phase-to-single-phase lathe conversion, please send:

- A clear photograph of the existing motor nameplate and the complete motor to allow us to see the mounting arrangement.

Call 01274 288777, email sales@mmengservices.co.uk or WhatsApp us with your photographs.

Single Phase Motor Speed (RPM) Ratings

Our single phase motors are available in various speeds, ranging from 1000RPM to 3000RPM, covering virtually all domestic, commercial and light industrial applications.

Speed Options

Single phase motors are available in three standard speeds:

  • 2-Pole (3000 RPM) – Higher speed, suitable for direct-drive applications like circular saws, pumps, and machinery requiring high rotational speed but have lower torque than a 1500rpm.
  • 4-Pole (1500 RPM) – Lower speed with higher torque, ideal for car lifts, gearbox-driven equipment, conveyors, and applications requiring more turning force.
  • 6-Pole (1000RPM) – Some applications also use 6-pole (1000 RPM) motors for very high torque requirements.
Our 2 Pole (3000RPM) Motors Our 4 Pole (1500RPM) Motors

Single Phase Motor Power Ratings (kW)

Our single phase motors are available in various powers, ranging from 0.09kW (0.12hp) to 3.7kW (5hp), covering virtually all domestic, commercial and light industrial applications.

  • Power (kW) Power (HP) Typical Applications
  • 0.09 - 0.18 0.12 - 0.25 Small fans, pumps, polishing machine.
  • 0.25 - 0.55 0.33 - 0.75 Ventilation fans/blowers, pillar drills, lathes with clutch systems.
  • 0.75 - 1.5 1.0 - 2.0 Pumps, circular saws, small machinery.
  • 2.2 - 3.7 3.0 - 5.0 150ltr+ Air compressors, car lifts, log splitters, heavy machinery, industrial equipment.

Single Phase Motor Frame Sizes Explained

Electric motors come in various frame sizes which determines the physical dimensions of the motor, including the mounting hole positions, shaft height, shaft diameter, length and keyway details. It is essential to match the frame size when replacing an existing motor.

Common Frame Sizes

  • Frame Shaft Height Typical kW Range
  • 56 56 mm 0.09kW (0.12hp) - 0.12kW (0.16hp)
  • 63 63 mm 0.12kW (0.16hp) - 0.18kW (0.25hp)
  • 71 71 mm 0.25kW (0.33hp) - 0.55kW (0.75hp)
  • 80 80 mm 0.55kW (0.75hp) - 1.1kW (1.5hp)
  • 90 90 mm 1.1kW (1.5hp) - 2.2kW (3hp)
  • 100 100 mm 2.2kW (3hp) - 3.0kW (4.0hp)
  • 112 112 mm 3.7kW (5hp) - 4.0kW (5hp)

Single Phase Motor Mounting Options

All our single phase motors feature multi-mount design with removable feet, allowing flexible installation. Standard mounting options include:

Blue electric motor on a white background

B3 (Foot mounted)

The most common configuration, where the feet are bolted to a base/mounting plate.

B5 (D Flange mounted)

Large flange for mounting direct to equipment. No feet required.

B14 or B14S (Small C Face mounted)

Smaller face flange for compact installation with drilled and tapped holes.

B14L (Large C Face mounted)

Larger face flange for compact installation with drilled and tapped holes.

B34S (Foot & Small C Face mounted)

A combination of a foot mount and a small face mount for a secure fit with maximum flexibility.

B34L (Foot & Large C Face mounted)

A combination of a foot mount and a large face mount for a secure fit with maximum flexibility.

B35 (Foot & D Flange mounted)

Combination mounting with large flange providing both stability on the ground and a direct flange coupling to the driven equipment.

V1 (Vertical Flange mounted with Rain canopy)

Large flange for direct mounting in a vertical position to equipment. No feet required with added protective rain canopy that shields the top of the motor from water ingress, dirt, and debris.

How to wire a Single Phase Motor

Single phase motors have a terminal box with clearly marked connections. Typically: L (Live), N (Neutral), and E (Earth). The capacitor(s) are usually internally wired. Below is our typical wiring diagrams for a Capacitor Start/Capacitor Run and Permanent Capacitor motor and shows the how to wire the motor for clockwise and anti-clockwise rotation.

Single Phase Motor Applications

Single phase motors power equipment across numerous industries and applications:

Agriculture & Farming

  • Grain augers and conveyors • Feed mixers • Barn ventilation fans
  • Water pumps • Milking pumps

Woodworking & Workshops

• Table saws and band saws • Planers and thicknessers

• Dust extraction • Pillar drills • Lathes

HVAC & Ventilation

HVAC & Ventilation • Extractor fans • Air handling units

Pumps & Water Systems

• Borehole pumps • Pressure boosters • Swimming pool pumps

• Pond pumps • Heating circulation pumps

How to Select the Right Three Phase Motor

Selecting the right three phase motor for your application requires matching several key specifications:

  • Specification Description
  • Power Rating Match or slightly exceed the power (W/kW/hp) requirement of your application. Check the existing motor nameplate or equipment manual.
  • Speed (Poles) 2-pole (3000 RPM) for high-speed applications. 4-pole (1500 RPM) for higher torque applications, 6-pole (1000 RPM) for slow and high torque or 8-pole (750 RPM) for maximum torque.
  • Frame Size Measure the existing motor frame size to ensure correct mounting dimensions and shaft height.
  • Motor Type Aluminium, Cast Iron, Brake Motor, Hazardous Area
  • Voltage 230/400V or 400/690V
  • Mounting Type B3 foot, B5 flange, B14 face, or combination mounting (B34 foot & face or B35 foot & flange)

Single Phase vs. Three Phase Electric Motors: Quick Comparison

Electric motors come in various frame sizes which determines the physical dimensions of the motor, including the mounting hole positions, shaft height, shaft diameter, length and keyway details. It is essential to match the frame size when replacing an existing motor.

  • Feature Single Phase Motor 230V Three Phase Motor 400V
  • Voltage (UK) 230V/240V 400V
  • Wiring Connections Live + Neutral (+ Earth) L1 + L2 + L3 (+ Earth)
  • Starting Method Capacitors + Centrifugal Switch Self-starting
  • Max Power Limit 3.7KW (5HP) Almost Unlimited (up to High Voltage)
  • Efficiency Standard - IE1 & IE2 High Efficiency (IE3/IE4/IE5)
  • Starting Torque Medium High
  • Full Load Torque Medium High
  • Variable Speed Control Not suitable for speed control Suitable for Speed control
  • Cost Higher Lower
  • Typical Use Home, Domestic, Small workshops Factories, Large Industrial/Manufacturing sites

Single Phase vs. Three Phase Electric Motors: Real World Example (2.2kW)

See below the actual difference between a 2.2kW single phase motor vs a 2.2kW three phase motor

  • Frame Shaft Height Typical kW Range
  • Voltage (UK) 230V/240V 400V
  • Power 2.2kW (3hp) 2.2kW (3hp)
  • Speed (RPM) Approx. 2800rpm Approx. 2800rpm
  • Frame Size 90L (90mm shaft height) 90L (90mm shaft height)
  • Wiring Connections Live + Neutral (+ Earth) L1 + L2 + L3 (+ Earth)
  • Efficiency IE2 – 83.2% IE3 – 85.9%
  • Starting Method 2 x Capacitors + Centrifugal Switch DOL Starting
  • Max number of start/stops 4-6 per hour 10 per hour
  • Efficiency IE2 – 83.2% IE3 – 85.9%
  • Starting Torque 16.79Nm 18.74Nm
  • Full Load Torque 7.3Nm 7.21Nm
  • Full Load Current 11.7A 4.35A
  • Cost £198.10 + VAT £160.56 + VAT
  • Availability In stock - FREE delivery to UK In stock - FREE delivery to UK

Three Phase to Single Phase Conversion FAQ
I want to convert 3 phase to single phase. Where do I start?

Start with sending us photographs of the machine and existing electric motor nameplate either by Email or WhatsApp.This gives our team the information needed to discuss a replacement.
Can I run a three phase motor on single phase power?

Yes, using a correctly specified converter, VFD, or motor replacement designed for single phase input.
What’s the best way to convert three phase to single phase?

We usually recommend replacing the motor with an equivalent single phase motor matched to load/torque and duty.
Will I lose power when converting three phase to single phase?

Choosing the right kW rating minimises torque and efficiency losses.
Is a new single phase motor better than using a phase converter?

For smaller loads (under 3kW) and long‑term reliability, a purpose‑built single phase motor is often the cleaner, lower‑maintenance option.
What information do you need to specify a conversion?

Motor kW or hp, voltage, speed (rpm/poles), frame size, application, and duty cycle are usually enough.
Can you convert industrial three phase machinery for use in a workshop?

Yes, many pumps, fans, compressors, car lifts and machine tools can be converted with suitable motors and control gear.
Can you help me find a single phase car lift motor?

Yes. Contact us with the car lift make and model, motor nameplate and mounting photographs. We have supplied replacement motors for hydraulic and screw or belt-driven lift applications, including Bradbury and Tecalemit car lifts.
How long does a three phase to single phase conversion take?

Simple motor swaps can be done in hours; full system upgrades with controls typically take a day or two.
Do you offer advice and supply for three phase to single phase conversions?

Yes, we specify, supply and support motors and drives for three phase to single phase conversions across many industries.