Lubricant for wire used for forming the stator windings of an electrical refrigerating compressor
AssigneeDanfoss A/S
InventorsJürgen Bachmann, Lars L. Finsen, Poul Erik Hansen
Life of this patent
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Abstract
A lubricant for a wire which is first insulated by means, of a lacquer coating, the wire being used for forming the stator windings of an electrical refrigerating compressor. The lubricant consists of one or more compounds of the formula CH3—Xn—R, wherein X is a linear or branched hydrocarbon group with n carbon atoms, wherein n is up to 22, and R may be hydrogen or a plurality of different radicals, either in a pure form or dissolved in a solvent. The lubricant is applied to the wire to reduce its coefficient of friction, and it is remarkable for its compatibility with the environmentally unharmful refrigerants, such as R134a (1,1,1,2-tetrafluoroethane).
Claims9
A coated wire which is used for forming the stator windings of an electrical refrigerating compressor using a refrigerant, said wire being first coated with an electrically insulating layer comprising a lacquer compatible with and resistant to said refrigerant and then a lubricant also compatible with said refrigerant, said lubricant consisting of at least one compound of the general formula
- CH3—Xn—R
- wherein X is a linear or branched hydrocarbon group with n carbon atoms and optionally containing one or more double bonds, and R is selected from a group consisting of
- (a) —COOR1, wherein R1 is C1-C4 alkyl, in which case n is 14-19;
- (b) —OOC—R2—COOR3, wherein R2 is C7-C10 alkyl and R3 is C1-C4 alkyl, in which case n is 0-3;
- (c)
- wherein R4 and R5 are separately hydrogen or C1-C2 alkyl, in which case n is 12-18;
- (d)
- wherein R6 and R7 are separately hydrogen or C4-C8 alkyl, in which case n is 0-3;
- (e) a group of the formula
- in which case n is 8-14;
- (f) a group of the formula
- in which case n is 8-14;
- (g) a group of the formula
- wherein R8 is hydrogen or C1-C2 alkyl, in which case n is 6-11 or
- (h) a group of the formula
- wherein R9 is hydrogen or C1-C2 alkyl, in which case n is 1-5.
Dependencies are inferred from the claim text.