Electric Motors
RJW Motors and Inverters supplies an extensive range of electric motors for industrial or domestic equipment. Available in different mounting options, including Foot mounted, Flange mounted and Face mounted, our robust and durable motors will suit every requirement and budget without compromising quality. Please note the current electric motor efficiency regulations state the following rules for induction motors: The electric motors included are single phase, three phase 50hz continuous duty electric motors. These electric motors must meet IE3 values or IE2 values when controlled by an inverter. Sizes include 0.75kW to 375 kW 2,4,6 Pole. Motors supplied by RJW comply with regulations and are IE3 efficient. If you aren’t sure on anything you can get in touch with our specialist team and we’ll be able to help.
Frequently Asked Questions
What types of electric motors are available?
RJW Motors and Inverters supply single-phase units running 0.12kW to 3kW on a standard 230V supply and three-phase motors that extend to 7.5kW, with TEC starting at 0.18kW and Brook Crompton covering the full range.
B56 imperial frames suit machine tools with rolled steel casings in drip-proof or totally enclosed options. Mounting styles include foot (B3), C face (B14), and D flange (B5) configurations.
How do I specify the correct motor for my application?
Electric motors have kW ratings you can match to your load demands, with single-phase limited to 3kW whilst three-phase extends to higher power outputs.
Environmental factors matter, too, with food processing needing washdown protection, dusty locations requiring totally enclosed fan cooling, and space constraints influencing mounting choices between foot, face or flange configurations.
Single-phase vs three-phase motors?
230V domestic supply restricts single-phase motors to 3kW maximum output. 400V industrial connections let three-phase units deliver consistent torque above 0.75kW with superior efficiency.
Capacitors complicate single-phase starting, especially on larger motors. Three-phase designs start directly, maintain cooler temperatures, and handle continuous duty without additional components.
What is the life expectancy of an electric motor?
It's normal for an electric motor to last 15-20 years when it is appropriately specified for your application.
Aggressive environments significantly reduce lifespan - chemical vapours attack windings, dust blocks cooling vents. Choosing the correct enclosure type from the start protects your investment better than any maintenance routine.
How do I select the appropriate motor speed?
Your driven equipment determines pole selection - fans typically need 2800-3000rpm two-pole motors, pumps suit 1400-1500rpm four-pole units, and conveyors often use 950-1000rpm six-pole designs. Direct coupling requires exact speed matching.
Variable speed drives offer flexibility when fixed speeds won't suffice. Belt reduction from faster motors sometimes provides better control than direct-drive arrangements.
Where can I find more information or assistance?
RJW Motors and Inverters provide technical support on 0800 999 0200. Our facility stocks the electric motors covered above, plus compatible drives and accessories.
Access wiring diagrams and dimensions online or email sales@rjweng.com for quotations.