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commutator segment mica
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IMG_3550.JPG
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Mica clips for electric motors
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high dielectric mica plate, 36" x 36"
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Molded Arcs from Shellac Molding Plate
Typical Industry Uses:
- Oil & Gas Production and Support Machinery
- Automotive
- Electrical/Hybrid Vehicles
- Industrial Motors
- Farm and Heavy Machinery
- Rail
- Power Generation and Distribution
- Metal Casting
- Aviation/Aerospace/Defense
- Mining
- Petrochemical
- Transformers
Segment Plate Mica
We specialize in the manufacture of simple and complex Mica parts, and have a design and engineering team capable of supporting product development, change and fulfillment. Our production capabilities are further elevated by proprietary and internally developed equipment that push fabrication options beyond the scope of other fabricated mica parts manufacturers. Building our Mica Splitting products in-house at our Virginia Facility gives us a significant advantage in controlling the quality of the product, review process with the clients and then allows very low lead times.
Fully cured material commonly used to punch or fabricate commutator segment mica for DC motors as insulation to separate copper segments in the comm. It also can be used to fabricate washers and spacers. Produced to NEMA 3 standards. Sheet sizes up to 36” x 36” for Shellac and 29.5" x 41.3" for AV. Shellac segment plate has a compression rating of 10,000 PSI. AV segment heater plate mica has a compression rating of 20,000 PSI. Average thickness tolerance is +/- .001" and Individual tolerance of +/- .002". Thickness range of .010” to .060” for Shellac and .020” to .060” for AV.
Other thickness available special order.
Built-Up Mica Splittings Segment Plate Inventory
Please reference the table below for the part number, NEMA Grade, Temperature Class, and other technical specifications for each of our available built-up mica splittings segment plate products.
| Product # | NEMA grade | Temp Class Fahrenheit | Temp Class Celcius | Binder Type |
Binder Content (% of weight) |
Thickness Range | Standard Thickness Tolerances | Short Interval Dielectric Strength (Volts/mil avg. | Standard Sheet Size |
|---|---|---|---|---|---|---|---|---|---|
| 262 | 3 | 265 | 130 | Shellac | 4-7% | Milled mica from .015" to .0625 | .002 avg. | 650 to .032" 550 from .033 - .0625 | 36"x36" |
| 266 | 1 | 265-310 | 130-155 | Alkyd-Vinyl | 4-7% | Milled Mica from .015" to .0625 | .002 avg. | 650 to .032" 550 from .033 - .0625 | 36"x36" |
| 270 | 1 | 310 | 155 | Epoxy | 4-7% | Milled Mica from .015" to .0625 | .002 avg. | 650 to .032" 550 from .033 - .0625 | 36"x36" |
| 300 | 4 | 265 | 130 | Shellac | 4-7% | Milled Mica from .015" to .0625 | .002 avg. | 650 to .032" 550 from .033 - .0625 | 36"x36" |
Mica Spec Sheets
| Type | Description | Bond | Temp Class | Available |
| NEMA 3 | Rigid Segment Plate | Shellac | Class C 130° C | Sheets up to 36" x 36". Thickness .015" to .060" |
| NEMA 3 | Alkyd-Vinyl | Class F 155° C | Sheets 29.5" x 41.3". Thickness .020" to .060" |
Other Related Mica Products
Hot Molded Mica Splitting Plate
Mica plate can be molded with heat for applications including V-rings for DC motors applications, angle channels, coil forms, and commutators.
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Cold Flexible Splittings Plate
Our production capabilities are elevated by proprietary equipment that push fabrication options beyond the scope of other mica manufacturers.
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Mica Plate Composites
Mica splitting with varnished glass adds toughness and strength to the plate. Excellent for applications such as slot lining or coils wraps.
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Sahney Repair Kits
Asheville Mica Company is an authorized reseller of Sahney India for traction motor rebuild kits for EMD D-78 traction motors and many other models.
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