JPS62293952A - Coil end insulation for rotary electric machine in direct liquid cooling system - Google Patents

Abstract

PURPOSE:To simplify a structure and cool a coil end efficiently, by taping the coil end with the insulating tape of the nonwoven fabric or the like having the great permeability of cooling liquid. CONSTITUTION:The full surface on the external side of an insulation 8 enclosing a conductor 7 at coil ends 4 projected from both the end surface of a stator core 3 is taped with the insulating tape 12 of the nonwoven fabric or the like having great permeability of the cooling liquid 6 such as Freon, oil, or the like. The liquid 6 is dropped from an injection port or an injection nozzle set near the coil ends 4 on a clyindrical frame 11, and is splashed or sprayed from injection nozzle, as shown by arrow heads, to the coil ends 4. The liquid 6 immediately percolates through the insulating tape 12, and a section remote from the injection port or the like also gets wet, and so the whole coil ends 4 can be cooled uniformly and directly and can be prevented from being locally heated.

Description

Detailed Description of the Invention 8. Detailed Description of the Invention [Technical Field to Which the Invention Pertains] This invention is directed to a direct liquid-cooled rotating electric machine, in which coil ends protruding from the end face of a cylindrical stator core are efficiently heated with cooling liquid. This relates to coil end insulation that allows for good cooling.

[Prior art and its problems]

A conventional example of a direct liquid cooling rotating electrical machine will be explained based on FIG. In this figure, a cylindrical stator core 3 surrounding the outer periphery of a rotor 2 is fitted onto the inner periphery of a cylindrical frame 1, and coil ends 4 protrude from both end faces thereof. The fill end 4 is entirely surrounded by an annular case 5 provided inside the frame 1, and a liquid 6 such as freon or oil is passed through the case 5 for direct cooling. The cooling liquid 6 is injected into the case 5 from the bottom of the frame 1 and discharged from the top.

Such a structure has the disadvantage that not only does the sealing structure become complicated in order to prevent the liquid 6 from leaking from the case, but also that the assembly process requires a lot of effort.

In order to eliminate such defects, an injection port for the cooling liquid 6 is provided near the coil end 4 of the frame 1, and if the liquid 6 is sprayed from the injection port toward the coil end 4 for direct cooling, the coil It is difficult to uniformly cool the entire coil end 4 because the liquid 6 is not sprayed onto the surface of the part of the end 4 that is far away from the injection port, and the liquid 6 sprayed onto the coil end 4 is also As shown in FIG. 2, the coil end 4 cannot be efficiently cooled because it is difficult to adhere to the insulator 8 surrounding the conductor 7.

[Purpose of the invention]

In order to eliminate the above-mentioned drawbacks, the present invention provides coil end insulation for a direct liquid-cooled rotating electric machine, which has a simple structure and can uniformly and efficiently cool the coil ends with a cooling liquid. With the goal.

[Key points of the invention]

In order to achieve the above object, the present invention is such that the coil ends are taped with an insulating tape made of nonwoven fabric or the like that is highly permeable to cooling liquid.

[Embodiments of the invention]

FIG. 1 and FIG. 2 show an embodiment of this invention.
Components designated by the same reference numerals as in FIGS. 3 and 4 are the same parts. In these figures, the coil ends 4 protruding from both end faces of the stator core 3 are further coated on the outside of the insulator 8 surrounding the conductor 7 with an insulating tape 12 made of non-woven fabric or the like that is highly permeable to the cooling liquid 6 such as Freon or oil. The liquid 6 is dripped from an inlet (not shown) provided near the fill end 4 at the top of the tube frame 11 and sprinkled onto the coil end 4 as shown by the arrow, or sprayed from an injection port. It looks like this.

According to the embodiment, the liquid 6 is sprinkled or sprayed onto the coil end 4 near the inlet or the injection port, but the liquid 6 immediately forms an insulator and prevents local heating.

〔Effect of the invention〕

According to the present invention, in the coil end insulation of a direct liquid cooling rotary wheel machine, the coil end protruding from the end face of the stator core is taped with an insulating tape made of non-woven fabric or the like that is highly permeable to the cooling liquid, and the liquid is partially absorbed. Since the entire coil end can be directly cooled uniformly even by sprinkling or spraying, the effect of efficiently cooling the coil end with a simple structure can be obtained.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of the main part of an embodiment of the present invention, FIG. 2 is a longitudinal sectional view along line T1 in FIG. FIG. 4 is a vertical cross-sectional view taken along the line ■-■ in FIG. 3; 8... Stator core, 4... Coil end, 6...
Liquid, 12...Insulating tape. jNR person; i no lk J-t mouth 2 Figure 2

Claims (1)

[Claims] 1) In a rotating electric machine in which a coil end protruding from the end face of a cylindrical stator core is directly cooled with a cooling liquid, the coil end is taped with an insulating tape made of non-woven fabric or the like that is highly permeable to the cooling liquid. Coil end insulation for direct liquid-cooled rotating electric machines featuring: