Electric Motors

An electric motor converts electrical energy into rotating mechanical output, driving the pumps, fans, compressors, conveyors and workshop machinery that keep an industrial site running. Getting the right motor onto the right job comes down to four things: supply (single-phase or three-phase), output power (kW), enclosure rating for the environment, and frame size for a bolt-in fit. AIMS Industrial stocks TechTop electric motors covering 240V single-phase and 415V three-phase supply, from 0.06kW up to 5.5kW, in aluminium and cast iron frame construction, including foot-mount and brake motor variants — with the couplings, pulleys, belts and bearings needed to install them. Our Electric Motor Selection Guide walks through the key differences if you're comparing options.

Electric Motor Range at AIMS — Quick Reference

This is the range genuinely held in stock. If you need something outside it — a larger kW, a different frame size, or a specific mounting configuration — get in touch and we'll help source it or point you to the closest fit.

How to Choose an Electric Motor

Single-phase or three-phase?

Single-phase motors run from a standard 240V supply, so they'll work anywhere there's a normal power outlet. They're the right call for smaller loads — workshop pumps, fans and light machinery — but get physically larger and less efficient as output climbs, and rely on a starting capacitor to get going. Three-phase motors run from a 415V three-phase supply and are the industrial default: simpler construction, no starting capacitor to fail, better starting torque, and available in the smaller fractional-kW sizes too, not just the big end. If three-phase power is on site, it's almost always the better long-term choice once you're above light-duty single-phase territory.

Sizing kW to the driven load

Undersizing a motor causes it to run hot and trip out or fail early under load; oversizing wastes money up front and runs less efficiently at partial load. Size to the actual duty of the driven equipment — a pump or fan manufacturer will specify the absorbed power at the duty point, and that's the number to match, not a round-up "to be safe". Where you're replacing an existing motor, the simplest approach is to match the kW, frame and mounting already on the nameplate.

Enclosure rating for the environment

A motor's IP (Ingress Protection) rating tells you how well it's sealed against dust and water. As a rough guide: IP44 covers general indoor workshop use with light splash; IP55 is dust-protected and rated against water jets, suiting washdown areas and sheltered outdoor installs; IP56 and IP66 step up further for heavy water jets, marine environments and high-pressure washdown. Check the nameplate or product spec on the motor you're looking at rather than assuming — enclosure rating varies by model.

Frame size and mounting

IEC (metric) frame numbers — 56, 63, 71, 80, 90, 100 and up — define the shaft height, shaft diameter and mounting hole pattern. Match the frame size when replacing a motor and the new one bolts straight in without adapter plates or re-drilling. Mounting configuration matters just as much: B3 is foot-mount, sitting on four feet bolted to a base or skid, and is the standard for general industrial drives; B5 is flange-mount, with a machined face and bolt pattern for direct coupling to a pump or gearbox with no baseplate; B35 combines both foot and flange on the one motor. Always confirm frame size and mounting together — a correct frame with the wrong mounting still won't fit the job.

Common Applications

• Pumps — water transfer, irrigation and process pumps, direct-coupled (B5) or belt-driven (B3)
• Fans and blowers — ventilation, extraction and cooling applications
• Compressors — workshop and small industrial air compressors
• Conveyors — belt and roller conveyor drives, often specified with a brake motor for controlled stopping
• Workshop machinery — general-purpose drive motors for fixed plant and equipment

Installation Basics

Before ordering, confirm the electrical supply matches the motor — 240V single-phase or 415V three-phase — and that the switchboard has capacity for the starting current, which briefly runs several times the motor's rated full-load current. Have a licensed electrician handle the connection and any starter or overload protection.

On the mechanical side, a foot-mounted (B3) motor driving through a belt needs a pulley keyed or taper-locked to the motor shaft, matched to a V-belt or belt sized to the centre distance and speed ratio required. A flange-mounted (B5) motor driving directly into a pump or gearbox instead needs a flexible coupling to absorb minor misalignment between the two shafts. Either way, check bearing condition on the driven equipment at the same time — a motor swap is the easiest time to replace worn bearings before they take out the new motor's alignment with them.

Brands Stocked at AIMS

AIMS Industrial stocks TechTop electric motors across the single-phase and three-phase range listed above. Standardising on one motor brand keeps replacement stock and specifications consistent, and means our team can talk you through the right model quickly rather than juggling multiple manufacturers' catalogues.

Companion Ranges

• Three-phase electric motors — the 415V range on its own
• Single-phase electric motors — the 240V range on its own
• Pulleys and V-pulleys — for belt-driven output
• Industrial V-belts and belts — power transmission to driven equipment
• Couplings & shaft collars — for direct-coupled drives to pumps and gearboxes
• Bearings and bearings & power transmission — replacement bearings and drive components
• Electrical & electronic — terminals, connectors and related electrical supplies
• Lubrication — greases for bearing maintenance

Frequently Asked Questions

What's the difference between a single-phase and a three-phase electric motor?

Single-phase motors run from a standard 240V supply and suit smaller loads such as workshop pumps, fans and light machinery. Three-phase motors run from a 415V three-phase supply, are simpler in construction with no starting capacitor, and are the preferred choice for general industrial machinery wherever three-phase power is available.

What size motor do I need for my pump, fan or compressor?

Match the motor's kW rating to the absorbed power the driven equipment's manufacturer specifies at its duty point, not a rough estimate. If you're replacing an existing motor, matching the kW, frame size and mounting already on the old nameplate is the simplest and most reliable approach.

What kW range does AIMS stock electric motors in?

The current range runs from 0.06kW up to 5.5kW, across both 240V single-phase and 415V three-phase supply, in aluminium and cast iron frame construction. For requirements outside this range, contact our team for sourcing options.

What does the IP rating on a motor mean?

IP (Ingress Protection) rating describes how well the enclosure resists dust and water. IP44 suits general indoor workshop use, IP55 is dust-protected and rated for water jets, and IP56/IP66 step up further for heavy washdown, marine and high-pressure environments. Check the specific model's rating rather than assuming, as it varies by motor.

What is IEC frame size and why does it matter for motor replacement?

IEC frame size sets the shaft height, shaft diameter and mounting hole pattern of the motor. Matching the frame size on a replacement motor means it bolts straight into the existing mounting without adapter plates or re-drilling holes.

What's the difference between B3 and B5 mounting?

B3 is foot mounting — the motor sits on four feet bolted to a base or skid, and is the standard arrangement for general industrial drives. B5 is flange mounting — a machined face with a precision bolt pattern that bolts directly to a pump or gearbox for direct coupling without a baseplate. B35 combines both foot and flange mounting on the one motor.

Does AIMS stock brake motors?

Yes — the TechTop BHR series covers 415V three-phase brake motors from 1.1kW to 5.5kW, foot mounted. These incorporate a spring-applied brake that engages automatically when power is removed, suiting conveyors, hoists and gates where the load needs to be held on stop rather than left to coast.

Can I run a three-phase motor on a single-phase supply?

Not directly — a three-phase motor needs a genuine three-phase supply, or a phase converter or variable frequency drive designed to generate three-phase output from single-phase input. Where only single-phase power is available and no converter is in the budget, a single-phase motor sized within its practical output range is the straightforward option.

What brand of electric motor does AIMS stock?

AIMS stocks TechTop electric motors across the current single-phase and three-phase range, in aluminium and cast iron construction with foot-mount and brake motor options.

What else do I need to install an electric motor?

For a belt-driven (B3) installation: a pulley on the motor shaft and a matching V-belt or belt to the driven equipment. For a direct-coupled (B5) installation: a flexible coupling between the motor and pump or gearbox shaft. Either way, check the bearings on the driven equipment while you're in there — a motor swap is the easiest time to catch worn bearings before they misalign the new motor.