JPH11125183A - Closed motor-driven compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make common use of a press winding line when a single phase induction electric motor is manufactured by forming a stator electromagnetic steel plate of a single phase induction electric motor part housed in a sealed case in an external shape according to output, and forming a slot shape of the stator electromagnetic steel plate in a specific shape regardless of its external shape. SOLUTION: In a stator of a single phase induction electric motor part, a stator core formed by fitting and laiminating an almost rectangular stator electromagnetic steel plate 23, is provided as a main member, and a main winding and an auxiliary winding arranged in a 90 deg. position to the main winding, are wound round this. A large slot 26 in which the main winding is installed and a small slot 27 in which the auxiliary winding is installed, are formed in respective stator electromagnetic steel plates 23, but when a high output type sealed compressor is manufactured, a stator electromagnetic steel plate 32 by enlarging a shape of the stator electromagnetic steel plate 23 without changing a shape of the large slot 26 and the small slot 27 of the stator electromagnetic steel plate 23, is applied. Therefore, common use of a press winding line of the stator electromagnetic steel plate can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an electric compressor used for a refrigerator or a refrigerator.

[0002]

2. Description of the Related Art Conventionally, a hermetic electric compressor is disclosed in
No. 03349 is known.

The prior art will be described with reference to FIGS. 14, 15 and 16, taking a hermetic electric compressor as an example. 14 is a longitudinal sectional view of a conventional hermetic compressor, FIG. 15 is a transverse cross-sectional view of the hermetic compressor, and FIG. 16 is a cross-sectional view of a stator and a rotor electromagnetic steel plate taken along a line AA ′ in FIG. .

[0004] In FIGS. 14, 15 and 16, reference numeral 1 denotes a sealed case, 2 denotes a compression mechanism disposed in the sealed case 1, and 3 drives the compression mechanism 2. It is a single-phase induction motor unit located. Reference numeral 4 denotes a suction pipe for sucking the refrigerant gas in the upper portion of the sealed case 1 close to the single-phase induction motor section 3 and transmitting the refrigerant to the compression mechanism section 2 below.

[0005] Reference numeral 5 denotes a stator of the single-phase induction motor unit 3.
Reference numeral 6 denotes a stator iron core constituting the stator 5. Reference numeral 7 denotes a substantially rectangular stator electromagnetic steel plate which forms the stator core 6 by being fitted and laminated, and has a notch 8 so as to avoid contact with the suction pipe 4. Reference numeral 9 denotes a bolt hole for fixing the stator to the compression mechanism 2.

Reference numeral 10 denotes a main winding of the stator. Reference numeral 11 denotes an auxiliary winding disposed at a position 90 ° with respect to the main winding 10. Reference numeral 12 denotes a slot size of the stator electromagnetic steel plate 7 in which the main winding 10 is provided. Reference numeral 13 denotes a small slot of the stator electromagnetic steel plate 7 in which the auxiliary winding 11 is provided. 14 is the slot size 11
Reference numeral 15 denotes a yoke near the slot 13. The yokes 14, 15 have the same width. Reference numeral 16 denotes a tooth near the large slot 12, and 17 denotes a tooth near the small slot 13. The teeth 16 and 17 have the same width.

Reference numeral 18 denotes a rotor of the single-phase induction motor section 3 provided inside the stator. Reference numeral 19 denotes a rotor iron core constituting the rotor 18. Reference numeral 20 denotes a rotor electromagnetic steel plate that forms a rotor iron core by being fitted and laminated.

[0010] In the hermetic electric compressor constructed as described above, an AC voltage is applied to the single-phase induction motor section 3, and the main winding 10 and the auxiliary winding 11 advance by 90 ° with respect to the main winding 10. Current flows through the yokes 14, 15, teeth 16,
17, a rotating magnetic field is generated in a magnetic circuit composed of the rotor iron core, and the rotor 18 is rotated by an electromagnetic induction action. The refrigerant gas sucked from the suction pipe 4 by rotation is compressed by the compression mechanism 2 and discharged to the refrigerant system through a discharge pipe (not shown). The main magnetic flux from the main winding 10 is larger than the main magnetic flux from the auxiliary winding 11, and the yoke 14 and the teeth 17 near the large slot 12 have the main magnetic flux of one small slot.
The auxiliary magnetic flux passes through the yoke 15 and the teeth 19 near 3.

Conventionally, in the case of a high-output hermetic electric compressor in the same compression mechanism 2, the excitation current due to an increase in the magnetic flux density due to the limitations of the yoke widths 14 and 15 and the teeth widths 16 and 17 has been known. Single phase induction motor 5 due to increase
In order to reduce the loss of the motor, the outer shape of the stator magnetic steel plate 7 is made larger and the single-phase induction motors 5 having different slot shapes 12 and 13 corresponding to the shape of the stator magnetic steel plate 7 are applied. In No. 5, a plurality of press / winding lines were held according to each shape.

[0010] Further, at the start of the operation of the suction pipe 4, the refrigerant gas dissolved in the oil stored in the bottom of the sealed case 1, which constitutes the low pressure section of the hermetic electric compressor at the time of starting, is foamed by the decompression of the sealed case 1. In order to avoid liquid compression due to the rise of the oil level, it is arranged above the sealed case 1 through the side of the single-phase induction motor unit 3.

[0011]

As described in the prior art, in each of hermetic electric compressors corresponding to the output using the same compression mechanism, different slot shapes corresponding to different stator electromagnetic steel plate outer shapes. The company used multiple single-phase induction motors, and had multiple press and winding lines in the production of single-phase induction motors.

In the above-described conventional configuration, the main magnetic flux from the main winding 10 is larger than the auxiliary magnetic flux from the auxiliary winding 11 even though the width of the slot and the yoke are the same. Since the main magnetic flux passes near the small slot 13 of the magnetic flux, the small slot 13 of the stator core 6
Between the teeth 17 and the yoke 14 near the large slot 12
In this structure, the magnetic flux density tends to concentrate on the high-voltage side, causing an increase in current value and an increase in temperature on the high voltage side during voltage fluctuation, and also an increase in temperature of the single-phase induction motor unit 3 itself.

In the above-described conventional configuration, the stator magnetic steel plate 7 has a substantially rectangular shape provided with a notch so as to avoid contact with the suction pipe 4, and the positions of the main winding 10 and the auxiliary winding 11 are different. Since it is specified, the insertion direction of the winding is specified by the position of the notch of the stator electromagnetic steel plate 7,
It was inconvenient in workability.

Further, in the above-described conventional configuration, since the stator electromagnetic steel plates 7 are laminated and fitted, the leakage magnetic flux increases, the loss of the single-phase induction motor unit 3 itself increases, and the temperature tends to rise. Has become.

[0015]

Means for Solving the Problems In order to solve the above-mentioned problems, a first aspect of the present invention relating to a hermetic electric compressor of the present invention is to provide a hermetic electric compressor having the same compression mechanism and different outputs. In the dual use, the slot shape is constant regardless of the outer shape of the stator electromagnetic steel sheet. Thus, even if the outer shape of the stator magnetic steel sheet is changed according to the output of each of the hermetic compressors, the shape of the slot is not changed, so that the press / winding line can be shared in the production of a single-phase induction motor.

In order to solve the above-mentioned problem, a second aspect of the present invention relating to a hermetic electric compressor according to the present invention is that the yoke length of the stator electromagnetic steel plate near the small slot is equal to the yoke length near the large slot. 86% or less. This makes it difficult for the magnetic flux density to concentrate on the yoke near the large slot, thereby preventing an increase in the current value and an increase in temperature on the high voltage side during voltage fluctuation.

According to a third aspect of the present invention, there is provided a hermetic electric compressor according to the present invention, wherein the teeth width of the slots of the stator electromagnetic steel sheet is larger than the teeth width of the slots. It is. As a result, the magnetic flux density hardly concentrates on the teeth of the slot booth, and it is possible to prevent an increase in current value and a rise in temperature on the high voltage side during voltage fluctuation.

Further, in order to solve the above-mentioned problem, a fourth aspect of the present invention relates to a hermetic electric compressor of the present invention, wherein semicircular cuts are provided at two positions opposite to the outer shape of the stator electromagnetic steel plate. A notch is provided. Thereby, the insertion direction of the winding is not specified, and the winding insertion operation is facilitated.

In order to solve the above-mentioned problems, a fifth aspect of the invention relating to a hermetic electric compressor of the present invention is based on the same premise as the first, second and third aspects. The electromagnetic steel plates of the rotor are laminated and fitted, and the stator electromagnetic steel plates are not laminated and fitted. Thereby, the leakage magnetic flux is reduced, the loss of the single-phase induction motor is reduced, and the temperature rise can be prevented.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is characterized in that the slot shape of the stator magnetic steel sheet is constant regardless of the outer shape of the stator magnetic steel sheet. Even if is changed in accordance with the output of each of the hermetic compressors, the shape of the slot is not changed, so that the press / winding line can be shared in the production of a single-phase induction motor.

According to a second aspect of the present invention, the yoke length near the slot of the stator magnetic steel sheet is 86% or less of the yoke length near the small slot, and the magnetic flux density is large. It has the effect that it is difficult to concentrate on the nearby yoke.

According to the third aspect of the present invention, the teeth width of the slots of the stator electromagnetic steel plate is larger than the teeth width of the slots, and the magnetic flux density is less likely to concentrate on the teeth of the slots. Have.

According to a fourth aspect of the present invention, a semicircular notch is provided at two positions opposite to the outer shape of the stator magnetic steel sheet, so that the insertion direction of the winding is not specified. .

According to a fifth aspect of the present invention, the electromagnetic steel plates of the rotor are laminated and fitted, and the stator electromagnetic steel plates are not laminated and fitted. Reduce losses.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same parts as those in the conventional example are denoted by the same reference numerals, and detailed description will be omitted.

(Embodiment 1) FIG. 1 is a longitudinal sectional view of a hermetic compressor according to an embodiment of the present invention, FIG. 2 is a transverse sectional view of hermetic compressor, and FIG. 'A sectional view of a stator and a rotor electromagnetic steel sheet in a section.

In FIGS. 1, 2 and 3, reference numeral 20 denotes a single-phase induction motor. Reference numeral 21 denotes a stator of the single-phase induction motor unit 20. Reference numeral 22 denotes a stator iron core constituting the stator 21. Reference numeral 23 denotes a substantially rectangular stator electromagnetic steel sheet which forms the stator iron core 22 by being fitted and laminated. Reference numeral 24 denotes a main winding of the stator 21. 25 is 90 to the main winding 24
Auxiliary windings arranged at the position of °. 26 is the main winding 2
4 is a slot size of the stator electromagnetic steel plate 23 in which the inside 4 is provided.
Reference numeral 27 denotes a small slot of the stator electromagnetic steel plate 23 in which the auxiliary winding 25 is provided. Reference numeral 28 denotes a yoke near the large slot 26, and reference numeral 29 denotes a yoke near the small slot 27. 30
Is a tooth with a large slot 26, and 31 is a tooth near the small slot 27.

In the high-power type hermetic compressor, the stator electromagnetic steel plate 3 is made larger without changing the shape of the large slot 26 and the small slot 27 of the stator magnetic steel plate 23.
Apply 2.

With the above configuration, even if the outer shape of the stator magnetic steel sheet is changed in accordance with the output of each of the hermetic compressors, the shape of the large slot 26 and the small slot 27 is not changed. Press and winding lines can be shared in motor production.

(Embodiment 2) FIG. 4 is a longitudinal sectional view of a hermetic compressor according to an embodiment of the present invention, FIG. 5 is a transverse sectional view of hermetic compressor, and FIG. Sectional drawing of a stator and a rotor electromagnetic steel sheet in a CC 'section of FIG.

4, 5, and 6, reference numeral 33 denotes a single-phase induction motor unit. Reference numeral 34 denotes a stator of the single-phase induction motor 33. Reference numeral 35 denotes a stator iron core constituting the stator 34. Reference numeral 36 denotes a substantially rectangular stator electromagnetic steel plate which forms the stator iron core 35 by being fitted and laminated. 37 is a main winding of the stator 34. 38 is 90 to the main winding 37
Auxiliary winding disposed at the position of °. 39 is the main winding 3
7 is a slot size of the stator electromagnetic steel plate 36 on which the interior 7 is mounted.
Reference numeral 40 denotes a small slot of the stator electromagnetic steel plate 36 in which the auxiliary winding 38 is provided. Reference numeral 41 denotes a yoke near the large slot 39, and reference numeral 42 denotes a yoke near the small slot 40. The width of the yoke 42 is 86% or less of the width of the yoke 41. 43 is a tooth between the large slots 39 and 44 is a tooth between the small slots 40.

With the above configuration, an AC voltage is applied to the single-phase induction motor section 33, and currents advanced by 90 ° with respect to the main winding 37 flow through the main winding 37 and the catching winding 38, respectively. A rotating magnetic field is generated in a magnetic circuit composed of 41, 42, teeth 43, 44 and rotor core 19, and rotor 18 is rotated by electromagnetic induction. The refrigerant gas sucked from the suction pipe 4 by rotation is compressed by the compression mechanism 2 and discharged to the refrigerant system through a discharge pipe (not shown).

It should be noted that the main magnetic flux generated by the main winding 37 is
The yoke 41 near the large slot 39 passes the supplementary magnetic flux, and the yoke 42 near the small slot 40 passes the main magnetic flux.

With the above-described configuration, conventionally, the length of the yoke near the large and small slots is the same, and when the output of the high-output hermetic compressor is 300 W, the main magnetic flux larger than the supplementary magnetic flux has a higher magnetic flux density. The magnetic flux density of the yoke near the passing slot was 1.69G, exceeding the practicable level of 1.55G, and could not be commercialized. However, in this embodiment, since the width of the yoke 42 is 86% or less of the width of the yoke 41,
The magnetic flux density of the yoke 41, through which the main magnetic flux larger than the supplementary magnetic flux passes, is 1.30 G, and the practicable level is 1.
55G or less, which can prevent an increase in current value and an increase in temperature on the high voltage side during voltage fluctuation.

(Embodiment 3) FIG. 7 is a longitudinal sectional view of a hermetic compressor according to a third embodiment of the present invention, FIG. 8 is a transverse sectional view of hermetic compressor, and FIG. Sectional drawing of a stator and a rotor electromagnetic steel sheet in a DD 'section of FIG.

In FIGS. 7, 8 and 9, reference numeral 45 denotes a single-phase induction motor. Reference numeral 46 denotes a stator of the single-phase induction motor unit 45. 47 is a stator iron core constituting the stator 46. Reference numeral 48 denotes a substantially rectangular stator electromagnetic steel plate that forms the stator iron core 47 by being fitted and laminated. 49 is a main winding of the stator 46. 50 is 90 ° with respect to the main winding 49
Is an auxiliary winding disposed at the position of. 51 is a main winding 49
Is large in the slot of the stator electromagnetic steel sheet 48 in which 5
Reference numeral 2 denotes a small slot of the stator electromagnetic steel plate 48 in which the auxiliary winding 50 is provided. 53 is a yoke near the large slot 51 and 54 is a yoke near the small slot 52. 55 is a tooth between the large slots 51 and 56 is a tooth between the small slots 52. Teeth 56 is Teeth 5
5, the tooth width is the length of the main magnetic flux amount times the auxiliary magnetic flux amount.

In the hermetic electric compressor constructed as described above, the main magnetic flux from the main winding 49 is larger than the auxiliary magnetic flux from the auxiliary winding 50, and the auxiliary magnetic flux between the large slots 51 is small between the small slots 52. Although the magnetic flux passes through, the width of the teeth 56 between the small slots 52 of the stator electromagnetic steel sheet 48 is twice as long as the width of the teeth 55 between the large slots 51 and the main magnetic flux with respect to the supplementary magnetic flux amount. The magnetic flux density between them is less likely to saturate, and when the voltage fluctuates, an increase in the current value and an increase in the temperature on the high voltage side can be prevented.

(Embodiment 4) FIG. 10 is a vertical sectional view of a hermetic compressor according to an embodiment of the present invention, and FIG.
Is a cross-sectional view of the hermetic compressor, and FIG.
Sectional drawing of a stator and a rotor electromagnetic steel sheet in an E 'section.

In FIGS. 10, 11 and 12, reference numeral 57 denotes a single-phase induction motor. 58 is a single-phase induction motor unit 57
Is a stator. Reference numeral 59 denotes a stator iron core constituting the stator 58. Numeral 60 designates the stator iron core 5
9. Notch 61 and notch 6 at a position facing notch 61 so as to avoid contact with suction pipe 4.
2 is a substantially rectangular stator electromagnetic steel plate provided with the second stator magnetic plate 2. 63 is a main winding of the stator 58. 64 is 9 for the main winding 63
This is an auxiliary winding disposed at a position of 0 °.

With the above-described configuration, in manufacturing the single-phase induction motor section 57, even if the stator iron core 59 is rotated by 180 °, the windings 63 and 64 can be inserted. Easier to do.

(Embodiment 5) FIG. 13 is a longitudinal sectional view of a hermetic compressor according to an embodiment of the present invention as set forth in claim 5.

In FIG. 13, reference numeral 65 denotes a single-phase induction motor. 66 is a stator of the single-phase induction motor section 65.
Reference numeral 67 denotes a stator iron core constituting the stator 66. Reference numeral 68 denotes a stator electromagnetic steel plate that forms the stator iron core 67 by lamination welding.

With the above-described configuration, the stator iron core 69 is formed by laminating and welding the stator electromagnetic steel plates 68. Therefore, the single-phase induction motor does not leak magnetic flux in each of the stator electromagnetic steel plates 68. The loss of the portion 65 can be reduced and the temperature rise can be prevented.

[0044]

As will be apparent from the above embodiment, according to the first aspect of the present invention, the stator has an outer shape corresponding to the output and the slot shape of the stator electromagnetic steel sheet is constant regardless of the outer shape. The press and winding lines can be shared in the production of single-phase induction motors.

According to the second aspect of the present invention, the yoke width near the small slot of the stator magnetic steel sheet is 86% or less of the yoke width near the large slot, and the magnetic flux density is large. It is difficult to concentrate on the nearby yoke, and it is possible to prevent an increase in current value and an increase in temperature on the high voltage side during voltage fluctuation.

According to the third aspect of the present invention, the teeth width of the slots of the stator magnetic steel sheet is larger than the teeth width of the slots. As a result, the magnetic flux density hardly concentrates on the teeth of the slot booth, and it is possible to prevent an increase in current value and a rise in temperature on the high voltage side during voltage fluctuation.

According to the fourth aspect of the present invention, semicircular notches are provided at two positions facing the outer shape of the stator magnetic steel sheet. Thereby, the insertion direction of the winding is not specified, and the winding insertion operation is facilitated.

According to the fifth aspect of the present invention, the stator electromagnetic steel sheets are not laminated and fitted. This allows
The leakage magnetic flux is reduced, the loss of the single-phase induction motor is reduced, and the temperature rise can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a hermetic compressor according to a first embodiment of the present invention described in claim 1.

FIG. 2 is a cross-sectional view of the hermetic compressor according to the first embodiment of the present invention described in claim 1.

FIG. 3 is a cross-sectional view of a stator and a rotor magnetic steel sheet taken along the line BB ′ of FIG. 1 according to the first embodiment of the present invention described in claim 1;

FIG. 4 is a longitudinal sectional view of a hermetic compressor according to a second embodiment of the present invention described in claim 2;

FIG. 5 is a cross-sectional view of a hermetic compressor according to a second embodiment of the present invention described in claim 2;

FIG. 6 is a cross-sectional view of a stator and a rotor magnetic steel sheet taken along the line CC ′ of FIG. 4 according to the second embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a hermetic compressor according to a third embodiment of the present invention described in claim 3;

FIG. 8 is a cross-sectional view of a hermetic compressor according to a third embodiment of the present invention described in claim 3;

FIG. 9 is a cross-sectional view of a stator and a rotor magnetic steel sheet taken along the line DD ′ in FIG. 7 according to the third embodiment of the present invention described in claim 3;

FIG. 10 is a longitudinal sectional view of a hermetic compressor according to a fourth embodiment of the present invention described in claim 4.

FIG. 11 is a cross-sectional view of a hermetic compressor according to a fourth embodiment of the present invention described in claim 4.

FIG. 12 is a cross-sectional view of a stator and a rotor magnetic steel sheet taken along the line EE ′ of FIG. 10 according to a fourth embodiment of the present invention described in claim 4;

FIG. 13 is a longitudinal sectional view of a hermetic compressor according to a fifth embodiment of the present invention described in claim 5.

FIG. 14 is a longitudinal sectional view of a conventional hermetic compressor.

FIG. 15 is a cross-sectional view of a conventional hermetic compressor.

16 is a sectional view of a conventional electromagnetic steel plate of a stator and a rotor taken along the line AA ′ in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sealing case 2 Compression mechanism part 20, 33, 45, 57, 65 Single-phase induction motor part 23, 36, 48, 60, 68 Stator electromagnetic steel plate 26, 39, 51 Slot large 27, 40, 52 Slot small 32 High Stator magnetic steel sheet of output type 41 Yoke near large slot 42 Yoke near small slot 55 Teeth between large slots 56 Teeth between small slots 61, 62 Notch

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Sojiro Nakazawa 4-5-2-5 Takaida Hondori, Higashiosaka-shi, Osaka Inside Matsushita Refrigerating Machinery Co., Ltd. Matsushita Refrigerating Machinery Co., Ltd. (72) Inventor Manabu Motegi 4-5-2-5 Takaida Hondori, Higashiosaka-shi, Osaka

Claims (5)

[Claims] 1. A closed casing houses a compression mechanism section and a single-phase induction motor section for driving the compression mechanism section, and a stator electromagnetic steel plate of the single-phase induction motor section has an outer shape corresponding to an output. In addition, the hermetic electric compressor has a fixed slot shape of the stator magnetic steel sheet regardless of an outer shape of the stator magnetic steel sheet. 2. A housing for accommodating a compression mechanism and a single-phase induction motor for driving the compression mechanism in a closed case, wherein the yoke length of the stator electromagnetic steel plate of the single-phase induction motor near a small slot of the magnetic steel sheet is a slot. A hermetic electric compressor characterized by being 86% or less with respect to the yoke length in the vicinity of a large area. 3. A compression mechanism section and a single-phase induction motor section for driving the compression mechanism section are housed in a closed case, and the stator electromagnetic steel plate of the single-phase induction motor section has a tooth width between slots and a slot booth. A hermetic electric compressor characterized by different tooth widths. 4. A compression mechanism section and a single-phase induction motor section for driving the compression mechanism section are housed in a closed case, and the single-phase induction motor section is located at a position facing the outer shape of the stator electromagnetic steel plate.
A hermetic electric compressor characterized by having semicircular cutouts in several places. 5. A closed casing containing a compression mechanism and a single-phase induction motor for driving the compression mechanism, wherein a stator electromagnetic steel plate constituting the single-phase induction motor is not stacked and fitted. The hermetic electric compressor according to any one of claims 1, 2 and 3.