JPH10126992A - Random stator winding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the temperature rise of a coil end and reduce the size of a dynamo-electric machine by a method wherein the cross-section of each coil end of a random stator winding of a plurality of turns has an approximately circular shape. SOLUTION: The coil end 3 of a random stator winding is bound by forming insulating yarns 14 or tapes at several positions so as to make its cross section including a plurality of turns of magnet wires approximately circular. By this forming, the cooling area of the random stator winding is increased and the temperature rise of the random stator winding can be suppressed, so that the size of a dynamo-electric machine can be reduced. If a spacer 17 is inserted, the effect is further enhanced and interlayer insulators which are conventionally needed can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling structure for a turbulent stator winding of a rotating electric machine.

[0002]

2. Description of the Related Art A conventional open-type rotating electric machine will be described with reference to FIGS.

In FIG. 7, (1) is an open type frame,
(2) is a stator iron core laminated with silicon steel sheets, (3) is a coil end of a turbulent stator winding, (4) is a rotor shaft, and (5) is a ventilation fan fitted to the rotor shaft. , (6) is the bracket,
(7) is a bearing, (8) is a rotor core, (9) is a rotor winding, (1
0) is a ventilation duct provided in the stator core, (11) is a cooling wind arrow which is sucked into the machine by a ventilation fan to cool each part of the rotating electric machine, and in FIG. 8 (12) is an inner circumferential side of the stator core. Slots provided in the axial direction. In FIG. 9, (13) denotes interphase insulation of the coil end portion. The insulated stator windings are sequentially placed in the slots (12), and the coil ends
(3) is put out in the air.

[0004]

In the conventional rotating electric machine having the above-described structure, the cooling air (11) is sucked into the machine by the ventilation fan (5). To cool the stator windings, the cooling air (11) passes through the outer peripheral surface of the coil end (3) and the stator core (2)
The cooling air (11) passes through the ventilation duct (10) provided in the air conditioner. When molding the conventional coil end (3),
As shown in FIG. 9, the cooling areas are reduced because they adhere to each other,
There was a problem that the cooling of the coil end (3) was poor.

[0005] An object of the present invention is to provide a turbulent stator winding capable of suppressing a rise in temperature of a coil end and reducing the size of a rotating electric machine.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, a single slot is provided in an axial slot of a stator core provided through an air gap around an outer periphery of a rotor core. In a multiple-turn stator winding wound in layer winding, the cross-sectional shape of each coil end of the winding is made substantially circular.

In the invention of claim 2, the single-layer winding of the invention of claim 1 is formed into a double-layer winding.

According to a third aspect of the present invention, in addition to the second aspect of the present invention, a frame-shaped spacer made of an insulating material for forming a gap between the coil end portions of the upper and lower coils and each one pole and one phase is provided.

According to the invention of claim 4, in addition to the invention of claim 3, the spacer is provided with an insulating projection which forms a gap between the coil ends of adjacent slots.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) Hereinafter, an embodiment of the first invention (corresponding to claims 1 and 2) will be described with reference to FIGS. In these drawings, (2) is the stator core, (3)
Is the coil end of a turbulent stator winding wound multiple times in a single layer or two layers, and (14) is an insulating yarn for molding (may be tape)
It is.

The coil end (3) is formed by joining a plurality of turbulently wound electric wires with a molding insulating thread or tape so that the cross-sectional shape becomes substantially circular.

In the above manner, the stator winding having a random winding
(3) The cooling area becomes large, the temperature rise can be suppressed, and the rotating electric machine can be downsized.

(Embodiment 2) Next, an embodiment of the second invention (corresponding to claim 3) will be described with reference to FIGS. In these drawings, (15) is the upper coil,
(16) is a lower coil, (17) is a circular frame-shaped spacer provided with a projection (19) in the radial direction of an annular ring (18) made of an insulating material, and the annular (18) of this spacer (17) Is the upper coil (15) and the lower coil (16)
Make a gap between The protrusion (19) also creates a gap between different phases. The spacers (17) are provided at one or a plurality of positions according to the length of the coil end.

The rest is the same as the first embodiment.

With the above-described arrangement, a gap is formed between the upper coil and the lower coil and between different phases and different phases. Cooling is improved, and the size of the rotating electric machine can be reduced.

(Embodiment 3) Next, an embodiment of the third invention (corresponding to claim 4) will be described with reference to FIGS. In these drawings, the projections (19) of the spacer (17) are provided between the coil ends (3) of each slot.

The rest is the same as the second embodiment.

By doing as described above, the cooling action is even greater than in the second embodiment.

[0019]

As described above, according to the present invention,
By making the cross section of the coil end portion of the turbulent stator winding substantially circular, the cooling surface area becomes large, the temperature rise of the turbulent stator winding can be suppressed, and the rotating electric machine can be downsized. it can. When the spacer is inserted, the effect is further enhanced, and the conventionally required interphase insulator can be omitted.

[Brief description of the drawings]

FIG. 1 is an elevational view showing a main part of Embodiment 1 of a randomly wound stator winding of the present invention.

FIG. 2 is an enlarged sectional view taken along line II-II of FIG.

FIG. 3 is an elevation view showing a main part of the second embodiment;

4 is an enlarged cross-sectional view taken along line IV-IV in FIG.

FIG. 5 is an elevation view showing a main part of the third embodiment.

FIG. 6 is an enlarged sectional view taken along line VI-VI of FIG.

FIG. 7 is an upper half longitudinal sectional view showing a conventional rotating electric machine.

FIG. 8 is an elevation view showing a main part of a conventional wound stator winding.

FIG. 9 is an enlarged sectional view taken along line IX-IX in FIG.

[Description of Signs] 1 ... Frame 2 ... Stator core 3 ... Coil end 4 ... Rotator shaft 5 ... Ventilation fan 6 ... Bracket 7 ... Bearing 8 ... Rotator core 9 ... Rotator winding 10 ... Ventilation duct 11 ... Cooling Wind 12 Slot 13 Interphase insulator 14 Insulating thread 15 Upper coil 16 Lower coil 17 Spacer 18 Ring 19

Claims (4)

[Claims] 1. A plurality of turns of a turbulent stator winding wound in a single-layer winding in an axial slot of a stator core disposed through a gap around an outer periphery of a rotor core. A turbulent stator winding characterized in that the cross-sectional shape of the coil end portion is substantially circular. 2. A plurality of turns of a turbulently wound stator winding, which is housed in a two-layer winding in an axial slot of a stator core disposed through a gap around an outer periphery of a rotor core. A turbulent stator winding characterized in that the cross-sectional shape of the coil end portion is substantially circular. 3. The turbulent stator winding according to claim 2, wherein a frame-shaped spacer made of an insulating material is provided to form a gap between the coil end portions of the upper and lower coils and one pole and one phase. 4. The turbulent stator winding according to claim 3, wherein the spacer is provided with an insulating projection which forms a gap between coil ends of adjacent slots.