JPS6253151A - Stator for canned motor - Google Patents

Abstract

PURPOSE:To fill insulating varnish without clearances by sealing a frame surrounding a stator core and both ends of a can by an end plate with injection and teeming holes and fast sticking a seal ring to the frame and one end surface of the core. CONSTITUTION:The outer circumferential surface of a stator core 1 into which a stator coil 2 is inserted is covered with a stator frame 4, a can 7 is bonded with the inside diametral surface of the frame 4, and both end sections of the can 7 and the frame 4 are sealed hermetically with end plates with injection and ejection holes 5a, 5a'. A seal ring 8 is fast stuck between one end surface of the stator core 1 and the frame 4. Insulating varnish is filled from the injection and ejection hole 5a' while the seal ring side is directed downward and the axial direction is made perpendicular and air is discharged from the injection and ejection hole 5a and a stator frame body 3 is vacuum-impregnated. Impregnation is completed, and an insulating gas is sealed into a void section 12 and the frame 4 is sealed by screws 6. Accordingly, a section between the frame 4 and the core 1 is filled with insulating varnish 11 without clearances, thus improving heat-dissipating characteristics.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a stator for a canned motor in which an insulating face is vacuum-impregnated into a stator frame that seals a stator body, and a highly thermally conductive insulating gas is filled in the stator frame. Regarding.

[Conventional technology]

A conventional stator for this type of canned motor is disclosed in Japanese Patent Laid-Open No. 59-50740.

The stator of this conventional canned motor is made by vacuum impregnating the stator frame body, which accommodates and seals the stator core and stator coils, with a fiber-resistant varnish. Measures have been taken to fill the gap with the circumference with an insulating face to improve heat dissipation characteristics and reduce temperature rise. The outer circumference of the laminated stator core inevitably has unevenness, and there is a portion where there is a slight gap from the inner circumference of the stator frame.

[Problem that the invention seeks to solve]

In the stator of the conventional canned motor as described above, if the gap between the outer circumference of the stator core and the inner circumference of the stator frame is large (approximately 0.1 mm or more), the stator frame must be stood upright. There was a problem in that when the insulating face was vacuum-impregnated inside the stator in the position, the insulating face adhering to the gap between the stator core and the stator 7 frames flowed downward and did not remain. This obstructs heat transfer between the stator core and the stator frame.

This invention was made to solve these problems, and even when the gap between the outer periphery of the stator core and the turbidity of the stator frame is relatively large, the stator core can be maintained in an upright position. Even if the insulating face is vacuum-impregnated and heated and dried, the insulating face that filled the gap will harden without flowing out, and the heat dissipation characteristics between the stator core and stator frame will be stably improved, resulting in a highly reliable can. The purpose is to obtain a stator for a motor.

[Means for solving problems]

The stator of the canned motor according to the present invention has a seal ring attached to one end surface of the stator core and the inner peripheral surface of the stator frame in close contact with each other.

[Effect]

When the insulation face is vacuum-impregnated into the stator frame which is in an upright position with the seal ring side down and dried by heating, the insulation face between the outer periphery of the stator core and the inner periphery of the stator frame is received by the seal ring. It remains buried and hardens without flowing out.

[Embodiment] FIG. 1 is a front view, partially in section, of a stator of a canned motor according to an embodiment of the present invention.

In the figure, 1 is the stator core, and on the outer periphery, a plurality of axial lines (la) are newly installed in the circumferential direction.
It is used to connect the laminated stator cores l together. 2 is a stator coil inserted into the slot of the stator core 1, and 3 is a stator frame body that accommodates the stator core 1 and the stator coil 2 and seals them watertight, which is constructed as follows. 4 is a stator frame that surrounds and supports the stator core 1; 5 is a pair of annular end plates that are welded and fixed to both ends of the stator frame 4 in a watertight manner around the outer circumference; An exit hole 5a is provided, and after use, a screw 6 is screwed in to seal it. A can 7 is fitted into the inner circumference of the stator core 1, and whose both ends are fitted into the inner circumference of each end plate 5 and welded watertightly.

A seal ring 8 is attached to one end surface of the stator core 1 and the inner circumferential surface of the stator frame 4 in close contact.
It is constructed as shown in the enlarged cross-sectional view in the figure. A reinforcing ring 9 made of a metal material is embedded and molded with a rubber-like elastic body 10 such as synthetic rubber, and an annular protrusion 10a is formed on the outer circumference, so that it tightly contacts the inner circumferential surface of the stator frame 4. That's what I do.

Reference numeral 11 is made of epoxy resin, etc., and is coated with the inner surface Kf= of the stator frame 3 by vacuum impregnation, and the stator coil 2
The insulating face layer is impregnated with heat and hardened, and the excess that is not applied after impregnation is discharged from the injection hole 5a.

An insulating face is vacuum impregnated into the stator frame 3 in an upright position with the seal ring 9 side facing down from the lower injection hole 5a.

When the insulating face filled in the stator frame 3 is brought to atmospheric pressure, the excess face adhering to each component is discharged from the lower injection hole 5a. The insulating face attached to the gap between the outer circumference of the stator core 1 and the inner circumference of the stator frame 4 is received by the lower seal ring 8 and remains filled without flowing out, and is hardened by heating and drying.

1z is a highly thermally conductive insulating gas filled into the cavity in the stator frame 3 from the injection hole 5a, such as highly insulating sulfur gas (40 to 10%) and highly thermally conductive helium. It is a mixture of gas (60 to 90%) to prevent corona generation and insulation deterioration of the stator coil 2.

〔Effect of the invention〕

As described above, 1. According to the present invention, the seal ring is attached to one end face of the stator core and the inner circumferential surface of the stator frame in close contact with each other, so that the stator frame body can be placed with the seal ring side facing down. Hold it in an upright position and vacuum-impregnate the inside with an insulating face.
When heated and dried, the insulating face attached to the gap between the outer periphery of the stator core and the inner periphery of the stator frame is hardened without flowing out, and the heat dissipation characteristics are stably improved and reliability can be increased.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional front view of a stator of a canned motor according to an embodiment of the present invention, and FIG. 2 is an enlarged sectional view of the seal ring shown in FIG. 1. 1... Stator core, 2... Stator coil, 3...
Stator frame body, 4... Stator frame, 5... End plate,
5a... Injection hole, 6... Sealing screw, 7... Can, 8... Seal ring Note that the same reference numerals in the drawings indicate the same or equivalent parts.

Claims (1)

[Claims] a stator frame that surrounds and accommodates the outer periphery of the stator core into which the stator coil is inserted; a can that is fitted into the inner circumference of the stator core and surrounds the inner diameter side; A stator frame body is composed of a pair of end plates on both ends that are watertightly connected to each other, and each end plate is provided with an injection hole and a sealing screw is screwed into the stator frame body. In a stator of a canned motor whose body is vacuum impregnated with insulating varnish and whose internal cavity is filled with highly thermally conductive insulating gas, the one end surface of the stator core and the inner circumferential surface of the stator frame A stator for a canned motor, characterized by having a seal ring attached in close contact with the stator.