JPH06105497A - Rotary electric machine - Google Patents

Abstract

PURPOSE:To provide a rotary electric machine having high reliability and long life by rigidly fixing a coil into a slot of a core, and preventing the wear of a main insulator of the coil based on an electromagnetic vibration. CONSTITUTION:A coil 1 provided with a main insulator 9 through a semiconductive filler 10 which is expanded at a temperature higher than the ambient temperature, cured without shrinkage after the expansion and has a high compression strength is contained in an axial slot 3 formed at a core 2, a wedge 8 is inserted into the opening of the slot 3, and the coil 1 is fixed in the slot 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary electric machine, and more particularly to improvement of coil fixing technology.

[0002]

2. Description of the Related Art For example, in a stator of a rotary electric machine such as a water turbine generator, as shown in FIG. 3, a coil 1 and an inter-coil spacer 4 and a slot bottom spacer are provided in a slot 3 provided in an iron core 2. A method in which the spacer 5, the side spacer 6, and the spacer 7 under the wedge are stored and fixed by the wedge 8 is widely adopted.

By the way, the slot 3 is usually larger than the dimensions when the slot bottom spacer 5, the coil 1, and the inter-coil spacer 4 are inserted so that the coil 1 can be easily inserted. Therefore, a clearance is formed between the slot 3 and the coil 1, and the coil 1 can move in this clearance, so that the side spacer 6 and the wedge spacer which match the clearance at the time of assembly. The coil 1 is fixed by inserting 7 (JP-A-59-10146, JP-A-59-10147, etc.).

[0004]

In the above structure, the iron core 2 causes electromagnetic vibration when a magnetic field acts. Due to this vibration, the main insulation 9 wound around the outer peripheral portion of the coil 1 is rubbed against the iron core 2 and the side spacers 6 and is worn. When the wear progresses, dielectric breakdown is finally caused. The degree of progress of wear varies depending on the amount of insertion of the side spacer 6, and naturally becomes lower as the clearance between the coil 1 and the slot 3 is sufficiently reduced. This is largely due to the skill of the operator when inserting the side spacer 6, which is not preferable from the viewpoint of product reliability and long life.

Therefore, the present invention aims to prevent abrasion of the main insulation due to electromagnetic vibration by firmly fixing the coil and the iron core in consideration of the assemblability, thereby contributing to reliability and a long service life. To do.

[0006]

In order to achieve the above object, according to the present invention, an axial slot for coil storage provided in an iron core is expanded together with a coil at a temperature higher than room temperature and hardened without contraction, and A wedge is inserted into the slot opening with a semiconductive filler having high compressive strength interposed.

[0007]

The present invention is constituted as described above, and the core portion is made of a semiconductive filler which expands in the slot portion at a temperature higher than room temperature, hardens without expansion and contraction, and has high compressive strength. Expands and hardens enough to fill the gap between the coil and the coil, so the expansion-hardened filler presses the core and coil firmly to secure the coil and core, and wear of the main insulation due to electromagnetic vibration. Can be prevented.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In this embodiment, as shown in FIG. 1, a semiconducting material which expands in a slot 3 provided in an iron core 2 at a temperature higher than room temperature and hardens without expansion and contraction after expansion and has high compressive strength. Filler 10 (eg POROMAT from isovolta)
ME0747 A coil 1 having a main insulation 9 is housed via a material (a glass base material of a porous expanded epoxy laminated plate is made semi-conductive), and a wedge 8 is inserted into an opening portion of a slot 3.

With the above-described structure, heat is applied to the iron core slot portion after assembly until the filling material 10 reaches a temperature at which the filling material 10 expands and hardens enough to fill the gap between the iron core 2 and the coil 1. This heat may be Julh heat generated by energizing the coil 1, or the entire core 2 may be heated from the outside.
The expanded and hardened filler 10 presses the iron core 2 and the coil 1 to firmly fix the coil 1 and the iron core 2.

Due to the above action, the residual stress at the time of expansion of the filler 10 presses the coil 1 and the iron core 2 to suppress electromagnetic vibration of the iron core 2, and the main insulation 9 wound around the outer peripheral portion of the coil 1 is suppressed.
Are prevented from rubbing against the iron core 2, and the main insulation 9 is not worn. Therefore, according to the present embodiment, it is possible to improve the reliability and extend the life of the rotating electric machine without causing the main insulation 9 to wear and cause dielectric breakdown.

As another embodiment, as shown in FIG. 2, inter-coil spacer 4, slot bottom spacer 5 and side spacer shown in FIG. 3 are provided in slots 3 provided in iron core 2. 6 and a semiconductive filler 10 which expands at a temperature higher than room temperature and expands and hardens without contraction after expansion, and which has a high compressive strength, is interposed around the coil 1, and the wedge 8 is provided at the opening of the slot 3. The same effect as that of the above-described embodiment can be obtained even if the structure is inserted.

[0013]

As described above, according to the present invention, a semiconductive filler which expands at a temperature higher than room temperature, hardens without expansion and contraction after expansion, and has high compressive strength is provided around the coil. By interposing it, the coil and the iron core are firmly fixed, electromagnetic vibration of the iron core is suppressed, rubbing of the main insulation of the coil outer peripheral part is prevented, and dielectric breakdown due to wear of the main insulation is not caused. It is possible to improve reliability and prolong life.

[Brief description of drawings]

FIG. 1 is a sectional view of a coil inserted in an iron core according to an embodiment of a rotating electric machine of the present invention.

FIG. 2 is a sectional view of a coil showing another embodiment.

FIG. 3 is a sectional view of a coil inserted in an iron core of a conventional rotating electric machine.

[Description of symbols] 1 ... Coil 2 ... Iron core 3 ... Slot 4 ... Coil spacer 5 ... Slot bottom spacer 6 ... Side spacer 7 ... Wedge spacer 8 ... Wedge 9 ... Main Insulation 10… Filling material

Claims (1)

[Claims] 1. A rotary electric machine in which a coil is housed in an axial slot for coil housing provided in an iron core, and a wedge is inserted into an opening of the slot to fix the coil, and the coil is expanded in the slot at a temperature higher than room temperature. In addition, a rotating electric machine is characterized in that a semiconductive filler having a high compressive strength and being hardened without being contracted is interposed.