Knowledge Base
All technical articles in one place. Written by our sales engineers for buyers, superintendents and electrical technicians.
Motor Failure Knowledge Base
The complete reference on electric motor failures: causes, diagnostics, root cause analysis, rewinding, marine and bow thruster motors, DC and variable frequency drives, plus repair versus replacement.
Open the knowledge baseIE3, IE4, IE5 or IE6? Which efficiency class, with TCO calculation
Concrete numbers for a 22 kW motor: when does an upgrade pay back, and when is IE3 genuinely enough?
SynRM vs PMSM: synchronous reluctance and permanent magnet motors
The two technologies behind IE5/IE6. The difference, why a drive is needed, and when to choose which.
Replacing a bow thruster motor: the superintendent checklist
Collecting documentation, comparing three delivery scenarios, and what to do when a vessel is stranded. Complete checklist.
Marine class certifications explained: BV, LR, DNV, ABS, RINA, ClassNK
Which society for which flag, essential vs non-essential, which documents you get, and the 5 most common mistakes.
ATEX zones for electric motors: when Ex db, Ex ec or Ex tb?
Zone 1, 2, 21, 22 explained, plus protection methods, gas groups, temperature classes and cost implications.
Motor rewind or replace? The actual cost comparison
Hard numbers for a 55 kW motor: when is a rewind smarter, when is new? Includes CO₂ footprint for ESG reporting.
Mounting B3, B5, B14 and combinations, which do you choose?
Guide to IEC mounting arrangements, dimension guidance and conversion options. For the most common replacement and OEM situations.
Brake motors: operation, AC/DC brake and IP67 protection
Fail-safe operation, AC versus DC brake, brake torque calculation and which IP class to choose. IP67 ex stock.
Multi-pole and pole-changing motors: 2-speed, 3-speed and Dahlander
Pole pairs and speeds, Dahlander winding, ATEX variants and marine applications. Practical selection guide.
Variable frequency drives: operation, selection and EMC classes
From PWM control and EMC classes to cable lengths, du/dt filters and the right sizing for PMSM motors.
Electric motor glossary
Brief definitions of 40+ terms: IE classes, ATEX zones, IP protection, class society, mounting types and more.
Dormot Pro vs ABB M3BP
Specs, price, lead time and warranty compared. Honest analysis by Van Bodegraven as supplier of both brands.
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