Explore our range of heavy-duty slip ring (wound rotor) and squirrel cage 3-phase asynchronous induction motors designed for high starting torque, heavy-duty duty cycles, and continuous operation in demanding UK industrial environments.
Power Output: 15 kW (20 HP)
Voltage Range: 400V / 415V 50Hz
Duty / Enclosure: S1 / IP55 TEFC
Rotor Type: Slip Ring (Wound)
Application: Heavy Prime Movers
Protection: IP23 / IP55 Optional
Speed / Poles: 1500 RPM / 4-Pole
Efficiency: IE2 High Efficiency
Supply: 415V 50Hz UK Standard
Rating: 3200 kW (3.2 MW)
HV Voltage: 3.3kV / 6.6kV / 11kV
Cooling: IC01 / Open Drip Proof
Power Range: 5.5 kW - 3150 kW
Voltage: 380V up to 10kV / 11kV
Insulation Class: Class H (VPI Process)
Application: Cranes & Port Hoists
Voltage: 380V / 440V / 660V
Duty Cycle: S3 / S4 Intermittent
Stator/Rotor: Copper Bar Winding
Mechanical: High Shock Resistance
Compliance: BS EN / IEC Standards
Frame Size: 280 Cast Iron Frame
Power / Speed: 75 kW / 1500 RPM
UK Grid Standard: 415V / 50Hz 3-Phase
Industrial manufacturing, water utility pumping, marine propulsion, and heavy mining across the United Kingdom demand rotating equipment engineered to withstand extreme duty cycles, severe environmental conditions, and rigorous regulatory standards.
As leading heavy duty induction motors manufacturers and suppliers for the United Kingdom market, TDC Parsons Peebles delivers bespoke electric motor solutions ranging from low-voltage (400V/415V) to high-voltage (3.3kV, 6.6kV, and 11kV) three-phase asynchronous induction machines. Built upon over 128 years of Scottish and British manufacturing heritage, our electric motors integrate advanced electromagnetic modeling, Vacuum Pressure Impregnation (VPI) insulation systems, and robust cast-iron or fabricated steel enclosures.
Whether replacing legacy equipment from Brook Crompton, GEC, Newman, or Parsons Peebles, or commissioning new infrastructure for UK Net Zero 2050 initiatives, selecting the correct induction motor topology—specifically comparing Squirrel Cage Induction Motors (SCIM) against Wound Rotor / Slip Ring Induction Motors (WRIM)—is critical for operational uptime and life-cycle economics.
Engineering comparison based on UK Grid (50Hz 415V/3.3kV/6.6kV/11kV) requirements and heavy duty mechanical loads.
| Design Parameter | Squirrel Cage Induction Motor (SCIM) | Wound Rotor / Slip Ring Motor (YR / YZR) | UK Market Application Fit |
|---|---|---|---|
| Starting Torque ($T_{start}$) | 150% - 220% of Full Load Torque | Up to 250% - 300% of Full Load Torque | Wound rotor superior for high inertia loads (ball mills, crushers). |
| Starting Current ($I_{start}$) | High (5.5x to 7.5x Full Load Current DOL) | Low (1.2x to 2.5x with External Rotor Resistance) | Slip Ring avoids UK DNO grid voltage dip penalties. |
| Speed Regulation | Constant speed (Variable via VFD integration) | Adjustable via liquid resistance starter (LRS) or VFD | Slip ring ideal for severe ambient / high thermal starting. |
| Thermal Stress Management | Heat dissipated inside rotor cage bars | Heat dissipated externally via rotor resistance bank | Prevents rotor overheating in frequent start/stop cycles. |
| Ingress & Explosive Protection | IP55 / IP66; Ex d, Ex ec, Ex p certified | IP23 / IP55; Ex p, Hazardous Area certified enclosures | Essential for North Sea offshore & petrochemical sites. |
| Maintenance Profile | Ultra-low (no brushes or collector rings) | Periodic slip ring & carbon brush inspection | SCIM for continuous automated plants; WRIM for heavy duty. |
Our heavy-duty induction motors are specifically engineered to address the climate, voltage standards, and industrial environment challenges unique to UK regions.
Offshore oil platforms, gas terminals (such as St Fergus and Teesside), and offshore wind support vessels require heavy-duty induction motors built to withstand aggressive salt-spray corrosion and hazardous gas atmospheres.
Municipal water authorities across the Midlands, North West, and London operate large-scale clean water supply pumps and wastewater aeration systems continuously.
Steel mills in Port Talbot, aggregate quarries in Derbyshire, and cement plants requiring massive starting torques under high dust and ambient temperature conditions.
Thermal power stations, biomass conversion facilities (such as Drax), and grid stabilization facilities running synchronous condensers and high-capacity draft fans.
Headquartered in Rosyth Royal Dockyard, Fife, Scotland, with major service complexes in Aberdeen and Birmingham, TDC Parsons Peebles represents the pinnacle of UK electrical rotating machinery engineering. Tracing our heritage back to 1896, our company has manufactured over 12,141 specialized heavy industrial machines and installed more than 200 MVA of rotary power converters worldwide.
Our core competitive advantage lies in our Information Gain & Custom Re-Engineering Capability. When legacy electric motors reach the end of their operational lifecycle, plant engineers often face massive civil modification costs to fit standard off-the-shelf motors.
We eliminate this friction by engineering 100% Drop-In Replacement Induction Motors. Our design engineering team matches exact shaft heights, foot-hole centers, terminal box positions, and electrical characteristics of legacy brands—ensuring seamless installation without altering existing bedplates or pipework.
Every heavy-duty induction motor manufactured or remanufactured at our UK facilities undergoes exhaustive electrical, mechanical, and thermal testing before delivery.
The UK Ecodesign for Energy-Related Products Regulations mandate minimum efficiency levels for 3-phase motors from 0.75kW to 1000kW. Our heavy-duty motors comply fully with IE3 Premium and IE4 Super Premium requirements, significantly reducing total electricity spend over a 20-year lifespan.
Following Brexit, industrial equipment placed on the Great Britain market must adhere to UKCA marking standards alongside traditional CE markings for Northern Ireland and EU export. All TDC Parsons Peebles machines carry full UKCA compliance documentation and BS EN certificates.
Energy costs represent over 90% of an industrial motor's total lifecycle cost. By optimizing slot fill factors, using high-grade electrical steel laminations, and reducing harmonic losses, our custom heavy-duty induction motors deliver industry-leading payback periods.
Our manufacturing and repair workshops maintain rigorous international quality, environmental, and hazardous area certifications.
ISO 9001:2015 Quality
AEMT Member
SGS Baseefa ATEX/UKEX
Achilles UVDB Verified
Complete rewind and electrical redesign of a 3.3kV slip ring motor for a Scottish paper mill, boosting efficiency by 4.2% while maintaining original mounting footprint.
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Manufactured a bespoke 2.4MW Ex p pressurized wound rotor induction motor for crude oil transfer pumps under emergency 8-week production schedule.
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Upgraded a legacy 11kV 4.5MW induction machine with modern VPI Class H insulation and dynamic vibration monitoring for a major UK water authority.
Inquire NowClear technical answers covering UK grid integration, standard voltages, lead times, and hazardous area certifications.
