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Stator Range:
Outside Diameter: 1.5 inch (38mm) to 5 inch (127mm) Inside Diameter: 0.75 inch (19mm) to 3 inch (76mm)
Size of Lamm Stack: 0.75 inch (19mm) to 4 inch (102mm) Size of Magnet Wire: 20 to 38 AWG
Slot Fill: Up to 60%, for max efficiency and low temp rise Length/ID ration: up to 6
Industries Served:
Motor manufacturers Pump manufacturers Commercial
Generator manufacturers Machine manufacturers Aerospace
Contact us if you have any special or unique configuration. We can make almost any work.
The following information describes our basic manufacturing steps and processes to produce stators.   
These processes can be customized as necessary to meet Customer requirements.
1). Lamm Stamping
Lamm steel from quality steel
manufacturers such as Nippon 
Steel (Japan), Posco Steel (Korea),
and/or Bao Steel (China). Core loss
and stacking factor are stable.
Typical grades include 50A290 (M19) and 50A600 (M45).
2). Lamm Stacking 
All  lamms are cleaned, aligned,
and TIG welded to stack assemblies.
Custom-made tools and fixtures
provide alignment per design
3). Insulating and Curing
Insulation is provided in multiple
forms. Epoxy coatings, including
3M™ Scotchcast™ Powder Epoxy
Coatings 260 or 5555 10G, typically  
ranging from 0.012 inches thickness, 
are applied with a fluidized bed process and heat cured.
4). Coil Winding
Magnet wire of the specified
type and size is wound on
custom precision chucks to
produce coils of the correct 
diameter. When possible, coils are wound in series to eliminate 
interconnections. In some special applications magnet wire is 
wound in-place over the insulated lamination stack.
5). Coil Inserting
Wound coils are inserted into the insulated slots of the stack. Specialized techniques are 
used to minimize coil size and thereby attain lower resistance values, and shorter end turns. 
When specified insulation is also placed between coil phases within the slots and/or within
the coil end-turns.
6). End-Turn Forming
End-turns are usually laced to form a neat package without loose strands of magnet 
wire coils. Using a press and a specially made forming  fixture, the magnet wire coils  
are formed (compressed) into their required dimensions.
7). Lead Wire Soldering (Optional)
Lead wires of the specified type, size, and length are connected to the magnet wire coils 
using high temperature solder. Brazing is also an available method. Lead connections are
then laced into the top end-turns (lead end) to hold them securely in place.
8). Lacing
Windings are tightly formed and laced to act as a single thermal mass to reduce hot spots. 
Tightly packing the windings also reduces wire vibration that cause acoustical noise and 
insulation failure. 
9). Varnishing and Baking
Varnish operation utilizes customer specified materials and processes. Facilities, such as 
Vacuum Pressure Impregnation (VPI), submersion, trickle down, and heat curing techniques,
are available. Varnishes on the stator ID can be cleaned. As an addition or alternative to
varnishing, stator assemblies can be encapsulated with Customer specified potting materials.
10). CNC Machining
Precise machining of stack surfaces is available. Stacks can be ground (outside diameter),
honed (inside diameter), turned, and milled to meet to meet the needed dimensions and
features. Tolerances of ± 0.001 inches (or closer if required) can be maintained.
11). Physical Inspection
  Inspection on stack coating thickness using a coating thickness gauge.
  Verification on stack coating adhesion using an impact test apparatus.
  Dimensional check on a finished stator using a caliper, a micro meter, and an indicator.
  Visual inspection using a magnifier, or a projector when it is necessary.
12). Electrical Testing/Label Printing
Every unit undergoes a Quality Assurance review. High potential voltage, surge, resistance,
Back EMF and other electrical tests are performed as necessary to assure conformance to
Customer specifications. Test results are electronically recorded and stored for future analysis.
If requested, test results may accompany each product shipments.

Test Fixture

Test Records


Inter-Turn Surge Tester Lamm Steel Core Loss Tester
Model No.: AN9692 Model No.: ATS-100M
DC/AC Voltage Withstand Tester DC/AC Voltage Withstand Tester
Model No.: AN9636H Model No.: CJ2671S
DC Low Resistance Tester DC Low Resistance Tester
Model No.: AN2512C Model No.: TH2511
Stator Test System
Model No.: AN8311