Dormot is a replacement-engineering motor brand for marine, industrial and ATEX duty. Designed to fit existing installations like-for-like, to lift them to the efficiency class the original never reached — and to ship in series to OEMs against a frozen specification.
Six elements that determine whether a motor lasts the duty cycle. The Dormot specification dialogue starts with these and works outward.
Copper windings, electrical-grade laminated core, F-class insulation as standard. The winding geometry determines IE2, IE3 or IE4 efficiency.
Squirrel-cage rotor, dynamically balanced. Hardened steel shaft machined to IEC tolerance — or to legacy drawing on file.
Sealed deep-groove ball bearings, sized for the rated load. Re-lubrication paths from frame 160 upward.
TEFC (IC411) by default. Fin geometry engineered for the duty cycle. Marine variants coated against salt corrosion.
IP55 minimum, IP65, IP66 or IP67 on request. Cable gland positions configurable: top, side, or rear.
IEC frames 56 to 560. B3 foot, B5 and B14 flange, B35 combination, or custom flange machined in-house.
A working register of the duty cycles, environments, and engineering challenges that the three Dormot lines were shaped around.
High starting torque, frequent on/off cycles, class-approved housings. Vessel manoeuvring depends on motors that start under load every time.
Continuous-duty (S1) operation in engine-room and process cooling circuits. Bearing life and thermal margin decide whether the schedule holds.
Submersible and dry-pit installations. Marine sewage, municipal water, industrial grey-water circuits. IP67 / IP68 sealing and corrosion resistance.
Brake motors with integrated safety stop. SOLAS-classified for life-boat lowering and deck cranes. Stopping under load is the specification.
Polder pumping, irrigation, drinking-water transport. Long S1 cycles, IP66 enclosures, VFD-driven for variable flow.
Process pumps, transfer pumps, booster sets. Standard IEC mountings or custom flange machined in-house. Often the flange is what fails to fit.
Conveyor drives, mill motors, crusher applications. High inertia at start, S1 thermal class, F-class insulation. Long bearing life is the baseline.
Zone 1 (Ex db, Ex db eb), Zone 2 (Ex ec), Zone tb dust ignition. Full IECEx 60079 certification. Available on Dormot Pro.
Long-term partnerships with European pump manufacturers, davit builders, shipyards, and process integrators. Drawings frozen, samples approved, series shipped.
Most replacement work fails at the interface. The Dormot workshop in the Rotterdam region handles shaft, flange, and terminal box modifications in-house — the work that gets a motor to fit when the catalog motor doesn't.
Decades of motor drawings, indexed and matchable. Legacy flanges and obsolete shafts cross-referenced against current IEC frames.
Diameter, length, keyway, hardness. Custom OEM flanges machined to drawing in-house. Hardened or stainless on request.
Vibration-free vertical and horizontal test stands. Full electrical and thermal report on every motor that leaves the floor.
Strip, rewind where required, vibration-balance to grade G2.5, full-load test. The Renew line is the documented output of this process.
When the catalogue number is gone but the installation isn't, the engineering starts with the measurements on the motor in front of you. The Dormot dimension sheet lets a service engineer record the frame, shaft, flange and terminal-box geometry of any existing motor — on the bench, on the vessel, on the production floor — and send it back to our engineering desk. We confirm the right Dormot line, the right specification, and the lead time.
A two-page PDF with all the dimensions, options, and electrical data we need to size your replacement. Print it, fill it in on the installation.
Download dimension sheet (PDF, 1 MB)Frame and shaft dimensions, manufacturer and type plate where readable, mounting orientation, ATEX zone if applicable. The dimensions matter more than the original part number.
sales@vanbodegraven.nl — the same desk handles Pro, Core, Renew, and OEM enquiries. The reply confirms the right Dormot line, the spec, and the delivery time.
After mechanical preparation, every motor passes through our in-house blast cabin, where the surface is shot-blasted to a clean profile. From there it goes directly into the spray booth, where it is suspended on chains for full 360° access and coated to corrosion category C5M under ISO 12944 — the specification for coastal and marine atmospheres. The chain mount is not staging. It is the working geometry that lets the coating reach every face of the housing in a single pass.
Short technical notes on recurring questions and edge cases. Written for the people who specify, install, and maintain Dormot motors.
VFD operation introduces bearing currents through capacitive coupling between rotor and shaft. For motors above frame 280 driven by VFD, an insulated non-drive end bearing is standard. Below frame 280, the risk is application-dependent — long cable runs, high carrier frequencies, and lack of dV/dt filtering push the threshold lower.
F-class insulation (155°C) is the Dormot standard. It accommodates a 40°C ambient with normal margin. For engine-room installations regularly seeing 45–50°C ambient, the practical winding temperature can approach the F-class limit. In those cases, the motor is specified to H-class insulation (180°C) — same physical motor, different magnet wire and impregnation. The cost premium is modest; the longevity gain is substantial.
A standard IEC frame motor will fit a standard IEC mounting. The replacement work that fails at the interface is almost always on installations where the original motor had a non-standard flange — a builder-specific bolt pattern, an offset shaft, or a flange diameter that doesn't match the modern equivalent. The Dormot workshop machines custom flanges to drawing in-house. The motor itself stays standard; the flange is the part adapted.
Class society type approval is not a blanket certificate for "all Dormot motors". It covers a specific motor type, frame range, voltage band, and protection class — and the approval document references those parameters. The Dormot Core line carries valid type approvals across all six societies for the standard configurations. Outside the standard envelope (custom voltage, unusual frame, special protection class), a per-case approval is required, which is engineered into the order.
Visits are welcome on appointment. The workshop is a 35-minute drive from Rotterdam city centre and 60 minutes from Schiphol Airport. The blast cabin, the spray booth, the bench-test rigs and the drawing archive are all on this single site. The Greek Mediterranean base is at Van Bodegraven Hellas in Piraeus.
Dormot motors are sold and serviced through Van Bodegraven Elektromotoren, the parent company. For all quotations, stock enquiries, technical support, OEM partnerships, and brand or press matters, the contact below is the working address.
Quotations, stock availability, lead times, and direct sales for all three Dormot lines, including ATEX variants.
sales@vanbodegraven.nlSpecifications, drawings, ATEX classification, custom shaft and flange, replacement matching against legacy installations.
sales@vanbodegraven.nlMulti-year OEM agreements, private-label supply, integration support. Brand assets, photography, interviews, and case studies.
sales@vanbodegraven.nlThe Van Bodegraven website covers Dormot inventory, related brands, the workshop, and the full operational picture.
vanbodegraven.nl →The first: does the new motor fit the existing footprint — frame, shaft, flange, terminal box — without engineering the application around it? The second: while the motor is out, can it be replaced with one that is more efficient, VFD-ready, and built for a longer duty cycle?
Dormot was established in 2000 as a dedicated electric motor brand by Van Bodegraven Elektromotoren — a family business trading in electrical materials since 1898, started in Feijenoord, Rotterdam. The brand operates from Wattstraat 8 in the Rotterdam region, with a second base in Piraeus, Greece, serving the Mediterranean shipping market since 2011.
The brand exists around two recurring questions in the replacement market. One: does the new motor fit the existing footprint — frame, shaft, flange, terminal box — without engineering the application around it? Two: while the motor is out, can it be replaced with one that is more efficient, VFD-ready, and built for a longer duty cycle? A third context — OEM series supply against a drawing-locked specification — uses the same engineering capacity in reverse. Dormot is built to serve all three.
In practice that means an in-house workshop that machines shafts, flanges and terminal-box positions to legacy drawing, a stock of motors held against the IEC frames that fail in service, and the engineering capacity to specify the right efficiency upgrade — IE2 to IE3 under EU MEPS, IE3 to IE4 where the duty cycle and payback justify it, or a VFD-ready retrofit where flow modulation has become the bigger lever than rated efficiency.
Three product lines extend from that core: Pro for engineered specials and ATEX, Core for stock-held marine and industrial replacement, Renew for reconditioned units. Sold and serviced through Van Bodegraven Elektromotoren, the parent company.
Dormot 2000 · VBE 1898
Rotterdam region
Piraeus, GR
Pro · Core · Renew
Three motors from the Dormot Core line, fresh from the workshop in the Rotterdam region. The yellow shaft cap is the factory marker — the motor is bench-tested and ready to ship. Same engineering, same documentation, same finish across the full frame range.
Cooling water pumps, HVAC, conveyors
Small pumps, fans, OEM sub-assemblies
Control gear, OEM integration, light duty
"The yellow shaft cap means the motor has cleared bench test. It only goes in when the electrical report and vibration measurement are filed. That cap is the last thing on, just before the motor leaves the workshop."Workshop note · Dormot bench-test protocol
Each line addresses a specific application context. The same engineering team, the same workshop, and the same documentation standard apply across all three.
The premium line. Engineered for heavy industry, marine class duty, and the four ATEX zones. Available in 2/4/6/8 pole, brake variants, IP55 to IP67. Non-ATEX from stock; ATEX engineered on request.
IEC 63–355
0.12–355 kW
2 / 4 / 6 / 8
Zone 1 / 2 / tb
The replacement line. Class-certified by all six major societies. 2/4/6/8 pole, brake variants, IP55 standard. From stock in Rotterdam for marine auxiliary and industrial replacement work.
IEC 56–355
0.09–355 kW
2 / 4 / 6 / 8
6 / 6
The reconditioning line. Stripped, rewound where required, vibration-balanced, and bench-tested under load. Twelve-month warranty, full electrical report.
63–560
≤ 1500 kW
12 months
Test report
A replacement is also the rare moment when energy efficiency can be lifted without disturbing production. Dormot specifies the upgrade route case by case — usually one of these two.
For installations still running pre-2017 IE2 motors, an IE3 (Premium Efficiency) replacement is the baseline upgrade and aligns the installation with current EU MEPS requirements. Same dimensions, same mounting, lower energy draw across the duty cycle. On continuously-running auxiliaries — cooling water pumps, HVAC fans, engine-room circulation — the energy delta typically pays back the price difference inside two years of operation.
On applications where flow or speed is no longer a constant — variable cooling demand, modulating ventilation, part-load pump duty — the larger efficiency lever is not the motor curve but the drive. The replacement Dormot motor is specified as VFD-compatible by default, with the option of insulated bearings and dV/dt filtering where the drive characteristics demand it. The motor is replaced once; the energy is saved every running hour after.
Both routes are specified by VBE engineering against the actual installation, not against a brochure. Reach the desk through sales@vanbodegraven.nl.
For pump manufacturers, davit and crane builders, compressor and HVAC manufacturers, and shipyards running multi-year production programmes. Dormot becomes the embedded motor — drawing frozen with engineering, sample approved by production, every shipment identical to the certified original.
Frame, shaft, flange, terminal box position, winding configuration, IP class, and nameplate are fixed at sample approval. The OEM's purchasing department orders against one Dormot type number; the OEM's service organisation maintains against one part number. No variation between purchase orders.
Custom shaft diameter for the pump impeller. Builder-specific flange machined in-house. ATEX certification per zone. Brake motor for the davit drive. Class society type approval where the OEM's vessel programme requires it. The motor is built to the OEM's specification, not selected from a catalogue around it.
Two supply models. For higher-volume series, Dormot can hold finished motors in stock in the Rotterdam region against the OEM's rolling forecast — same-week shipment when the production line calls. For lower volumes or longer ATEX configurations, the build is scheduled against the OEM's programme. The arrangement is agreed up-front, not improvised per order.
Private label / co-branded supply is available for OEMs with their own brand recognition in their market. Discuss with VBE.