Electric Motors

Condition Monitoring for Cost Effective Maintenance

Extract of tests and services:

insulation resistance test
insulation test
partial discharge (PD)
baker test
tan-delta test
polarization index (pi-test)
frequency analysis
vibration test
noise testing
laser alignment
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Our Standard Scope of Overhaul Includes the Following Services

record of performance data
control of overall machine condition
checks of all machine parts and auxiliaries (such as external fans, speed detectors, brakes, sensors, etc.)
dismantling of machine
visual checks and dimensional measurement of all machine parts, such as bearings seats, fits, centering fits, bearing shells, shaft ends, keyways, etc.
run out check
bearing check

Assembling and Preparation of Machines

cleaning of all machine parts and windings by special cleaning treatment incl. drying procedure by vacuum-oven procedure
control of cleaning results and electrical measurements after cleaning
impregnation of existing winding
dynamic balancing of rotors
check of sleeve bearings (white metal, bearing clearance, appearance of bearing surface after bedding in) incl. auxiliaries such as oilrings, sealings etc.
change of antifriction bearings
change and replacement of all screws
test-run incl. bearing check and vibration check
electrical test acc. to latest standards en, iec, vde
repainting the machine

Control of Electrical Parts

check of windings and winding support elements
check of press fit of cores and slot wedges
check of banding insulation, terminal boxes, terminal bolts, insulators and winding leads
check of rotor cage in order for cracks in rotor bars and short-circuit-rings
check and overhaul of brush-arrangements
overhaul slip-ring surfaces by turning procedure
check of pole fastening of salient pole rotors
adjust salient pole fixing
adjust commutator fixing
check connection between windings and commutator
overhaul commutator by turning procedure
adjust commutator by segment cutting procedure
sawing out mica and adjust shape of edges of segments
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Organizational Sequence of Maintenance and Repair Tasks

You supply the machine specifications, such as manufacturer, type, capacity, voltage, rotational speed, model, type of bearing, etc., as well as the potential damage. We prepare an offer comprising the respective scope of repair work. If you place your order, we draw up an inspection report after dismantling and testing the windings and mechanical parts.

Additional Scope of Work

In case other originally unknown damages on the machine are found during this inspection, which we think should be repaired, we draw up an additional offer. The decision regarding the execution of this additional repair work is made after consulting you.