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Power insertable polyamide-imide coated magnet wire
| Details |
Inventors: Saunders, Hollis S.; Carmer, Richard V.; Payette, Lionel J.;
Assignee: Essex Group, Inc. (Ft. Wayne, IN)
Primary Examiner: Kendell; Lorraine T.
Assistant Examiner:
Attorney, Agent or Firm: Gwinnell; Harry J.
A magnet wire having a polyamide-imide outer coating is described which is capable of power insertion into coil slots in a locking wire size range by virtue of a specific lubricant outer coating. The external lubricant comprises a mixture of paraffin wax and hydrogenated triglyceride. An internal lubricant composition comprised of esters of fatty alcohols and fatty acids can be added to the polyamide-imide coatings to provide greater ease of insertability. |
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DETAILED DESCRIPTION We claim: 1.
A lubricated magnet wire comprising an electrically conducting substrate having an electrically insulating polyamide-imide outer coating, and an external lubricant coating on the polyamide-imide outer coating comprising a mixture of paraffin wax and hydrogenated triglyceride in a ratio by weight of 1:30 to 30:1, the coated magnet wire capable of power insertion into coil slots in its locking wire size range.
2.
The wire of claim 1 having a ratio of paraffin wax to hydrogenated triglyceride of approximately 1:1.
3.
The wire of claim 1 wherein the paraffin wax has a melting point of 50.
degree.
C.
to 52.
8.
degree.
C.
, a refractive index of 1.
4270 at 80.
degree.
C.
, a specific gravity of 0.
839 at 15.
6.
degree.
C.
, and a flash point of 212.
8.
degree.
C.
4.
The wire of claim 3 wherein the hydrogenated triglyceride has a melting point of 47.
degree.
C.
to 50.
degree.
C.
, an Iodine No.
of 22 to 35, a Saponification No.
of 188 to 195, a maximum Acid No.
of 5 and approximate fatty acid component proportions of 8% C.
sub.
14, 34% C.
sub.
16, 27% C.
sub.
18, 16% C.
sub.
20 and 15% C.
sub.
22 fatty acids.
5.
The wire of claims 1, 2, 3 or 4 having an electrically insulating layer of polyester between the substrate and the polyamide-imide outer coating.
6.
The wire of claims 1, 2, 3 or 4 which additionally contains in the polyamide-imide insulation layer about 0.
05% to about 8% by weight of a internal lubricant comprising esters of fatty acids and fatty alcohols.
7.
The wire of claim 6 wherein the internal lubricant is present in about 0.
1 to about 4% by weight.
8.
The wire of claim 6 having an electrically insulating layer of polyester between the substrate and the polyamide-imide outer coating.
9.
The wire of claim 4 wherein the internal lubricant is present in about 1% by weight, has a Saponification No.
of 130-140, an Iodine No.
of 85-95 and comprises, in approximate percents, 54.
6% of C.
sub.
12 to C.
sub.
14 fatty alcohol esters of tall oil, 24.
5% tri-pentaerythritol esters of tall oil fatty acids, 9
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