Maintenance, repair and rewinding of electric motors and drive components up to 1000 kW with 24-hour service
Krull Elektromotoren GmbH
HannoverNew on Amplifa
About Krull Elektromotoren
Krull Elektromotoren GmbH is a medium-sized company based in Hannover, founded in 1937 and currently employing 15 staff. The company repairs and maintains AC and DC motors of all makes up to 1000 kW as well as brake motors, gear motors, servo motors, compressors, pumps, fans and crane systems. In its own winding shop, rewinds are manufactured according to the original winding, including dip varnishing, removal of defective windings in the pyrolysis oven and final testing by surge voltage/surge impulse measurement. Further value-adding services include mechanical machining (turning up to 350 mm centre height, milling, welding), thermal flame spraying, computer-controlled precision balancing and a test field with load testing. In addition, the company offers servo technology, lifting and conveying technology including UVV inspections, laser-precise machine alignment, a spare parts warehouse and the sale of motors and drive components. A nationwide 24-hour on-site service is available around the clock. Customers include companies from the automotive, food, logistics and building materials sectors as well as many other industrial businesses.
- Site
- Hannover
- Processes
- Repair and maintenance of AC and DC motors of all makes, Repair and maintenance of electric motors (AC, brake, gear and servo motors, compressors,, Rewinds for AC and DC motors according to the original winding (dip varnishing,, Rewinding of servo motors, load magnets and magnetic brakes, Mechanical machining of all kinds (turning with max. centre height 350 mm, milling and, Thermal flame spraying of shafts and bearing seats, Precision balancing on computer-controlled balancing machine, Gearbox repair
- Materials
- Rewinding according to original winding, Thermal flame spraying, Mechanical machining, Precision balancing
- Certificates
- Test field (mechanical/electrical, load testing), Surge voltage/surge impulse testing of windings, UVV inspections of lifting and conveying equipment, Laser-precise machine alignment, ISO 9001
- Founded
- 1937
- Employees
- 15
- Industries
- Industry (general), Food, Automotive, Railway/Logistics, Trade fairs, Postal/parcel services
- 01
Enquiry and fault analysis (workshop or on-site)
- 02
Disassembly and removal of defective windings in the pyrolysis oven
- 03
Rewinding and dip varnishing
- 04
Mechanical machining, flame spraying, balancing
- 05
Assembly and gearbox repair
- 06
Test field inspection mechanical/electrical with load testing
- 07
Delivery or on-site installation and service
Processes and Equipment
Rewinding according to original winding
Rewinds for AC and DC motors, servo motors, load magnets and magnetic brakes, dip-varnished.
Thermal flame spraying
Coating of shafts and bearing seats for restoration.
Mechanical machining
Turning up to 350 mm centre height, milling and welding work on drive components.
Precision balancing
Computer-controlled balancing machine for rotors and drive components.
Locations
Hannover
DEHeadquarters, workshop, winding shop
- Hydraulic press (280 kN)
- Lathe (max. centre height 350 mm)
- Computer-controlled balancing machine
- Pyrolysis oven
- Test field with load testing
- Surge voltage/surge impulse measuring device
- Laser-precise metrology
Inside the production
Industries
Processes & technical limits
| Processes | Tolerance | Max. part | Weight | Lot size | Materials |
|---|---|---|---|---|---|
| Repair and maintenance of AC and DC motors of all makesAssembly | – | – | Power up to 1000 kW | – | – |
| Repair and maintenance of electric motors (AC, brake, gear and servo motors, compressors,Assembly | – | – | – | – | – |
| Rewinds for AC and DC motors according to the original winding (dip varnishing,Assembly | – | – | – | – | – |
| Rewinding of servo motors, load magnets and magnetic brakesAssembly | – | – | – | – | – |
| Mechanical machining of all kinds (turning with max. centre height 350 mm, milling andMachining | – | Centre height 350 mm | – | – | – |
| Thermal flame spraying of shafts and bearing seatsSurface | – | – | – | – | – |
| Precision balancing on computer-controlled balancing machineTesting | – | – | – | – | – |
| Gearbox repairAssembly | – | – | – | – | – |
| Test field inspections of motors (mechanical, electrical, load testing for all types of drives)Testing | – | – | – | – | – |
| Laser-precise metrology / most precise machine alignmentTesting | – | – | – | – | – |
| Servo technology service (DC/AC servos, spindle drives, low-backlash gearboxes,Assembly | – | – | – | – | – |
| Lifting and conveying technology: repair, maintenance, UVV inspections and sale (rope hoists, ropeAssembly | – | – | – | – | – |
| 24-hour on-site service for breakdowns and repairs (nationwide in Germany, express service)Assembly | – | – | – | – | – |
| Sale of electric motors, drive components and spare parts (extensive spare parts warehouse)Assembly | – | – | – | – | – |
| Maintenance, repair and new installation of systemsAssembly | – | – | – | – | – |
7 Anlagen & Maschinen
| Machine | Manufacturer / model | Quantity | Working area | Year built | Site |
|---|---|---|---|---|---|
| Hydraulic press | – | 1 | maximum pressure 280 kN | – | Workshop Hannover |
| Lathe | – | 1 | max. centre height 350 mm | – | Workshop Hannover |
| Computer-controlled balancing machine | – | 1 | – | – | Workshop Hannover |
| Pyrolysis oven (pyrolysis process) | – | 1 | – | – | Winding shop Hannover |
| Test field (mechanical and electrical motor testing, load testing) | – | 1 | – | – | Workshop Hannover |
| Surge voltage/surge impulse measuring device (final inspection of windings) | – | – | – | – | Winding shop Hannover |
| Laser-precise metrology (machine alignment) | – | – | – | – | Hannover |
Additional services
Reference customers
Quality and Testing
Motors are tested mechanically and electrically in the company's own test field; load testing is possible for all types of drives. Windings are checked by high-frequency surge voltage or surge impulse measurement before leaving the winding shop.
| Evidence | Hannover |
|---|---|
| Test field (mechanical/electrical, load testing) | |
| Surge voltage/surge impulse testing of windings | |
| UVV inspections of lifting and conveying equipment | |
| Laser-precise machine alignment | |
| ISO 9001 |
History
- 1937
Foundation of the company