JP3747882B2 - Electric motor and compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric motor and a compressor using the electric motor, and particularly relates to measures for improving the reliability of insulating members disposed on both sides of a stator core in the electric motor.
[0002]
[Prior art]
Conventionally, as an electric motor, for example, as disclosed in JP-A-9-182388, a rotor in which a rotor is rotatably disposed inside a stator is generally well known. In this type of electric motor, the stator includes a cylindrical stator core and annular insulating members provided at both ends of the stator core in the axial direction. A plurality of teeth arranged in the circumferential direction are provided on the inner side of the main body for mounting the winding. And the coil | winding is directly wound on the tooth | gear part of a stator core in the state which accumulated the tooth | gear part of the insulating member on it. That is, for example, the tooth portion of the insulating member protrudes from the inner peripheral edge of the annular insulating member body, and the tip portion of this tooth portion is provided with a tip portion extending in the axial direction on the side away from the tooth portion of the stator core. The winding is housed in a space formed by the insulating member main body and the tooth portion.
[0003]
Then, by energizing the winding wound in this way, a rotating magnetic field is generated in the stator core, and a rotational driving force is obtained by rotating the rotor inside the stator. .
[0004]
[Problems to be solved by the invention]
By the way, in the said conventional thing, when winding a coil | winding, the front-end | tip part of the insulating member might receive the force from a coil | winding, and might incline inside. Then, the tilt of the tip portion causes a problem that the insulating member is cracked at the base portion of the tip portion, or the tip portion tilts inward to come into contact with the rotor, causing a rotation failure of the rotor.
[0005]
Therefore, the present invention has been made in view of such a point, and an object of the present invention is to improve the reliability by improving the structure of insulating members arranged on both sides of the stator core. There is.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides an outer peripheral side such that the tip portion (59) of the tooth portion (57) of the insulating member (37, 38) becomes thinner as the distance from the stator core (36) increases. The side surface (64) is formed in an inclined shape.
[0007]
Specifically, in the invention of claim 1, the insulating members (37, 38) are disposed on both axial sides of the stator core (36), and the windings (39) are interposed with the insulating members (37, 38) interposed therebetween. Assuming an electric motor that is wound around the stator core (36), the insulating member (37, 38) is fixed to the tooth body (58) from the front end side of the tooth body (58). A tooth part (57) having a tip part (59) standing upright to extend to the opposite side to the child core (36) is provided corresponding to the tooth part of the stator core (36), and the tip part ( The outer peripheral side surface (64) of 59) is inclined so that the thickness of the tip end portion (59) decreases as the distance from the stator core (36) increases.
[0008]
Further, the invention of claim 2 is the invention of claim 1, wherein the outer peripheral side surface (64) of the tip portion (59) of the tooth portion (57) is at least 10 degrees from the direction orthogonal to the tooth portion main body (58). Inclined.
[0009]
According to a third aspect of the present invention, in the second aspect of the present invention, a curved surface portion (58) is provided at a boundary portion between the outer peripheral side surface (64) and the tooth portion main body (58) at the tip portion (59) of the tooth portion (57). 65) is provided.
[0010]
According to a fourth aspect of the present invention, in the third aspect of the present invention, the curvature radius of the curved surface portion (65) is 2 mm or more.
[0011]
According to a fifth aspect of the invention, in the invention of any one of the first to fourth aspects, a tooth portion (57) is disposed on the inner peripheral surface side of the stator core (36), and an inner side of the tooth portion. A rotor (35) is disposed on the top.
[0012]
The invention of claim 6 is the invention of any one of claims 1 to 5, wherein the winding (39) is wound around each tooth portion of the stator core (36).
[0013]
The invention according to claim 7 is a compressor including the electric motor according to any one of claims 1 to 6.
[0014]
That is, in the first aspect of the invention, the winding (39) is wound from above the teeth (57) of the insulating members (37, 38) disposed on both sides of the stator core (36). A tip portion (59) is erected on the tooth portion (57) of the insulating member (37, 38) so as to extend from the tooth portion main body (58) to the opposite side of the stator core (36). The distal end portion (59) is inclined on the outer peripheral side surface (64) so that the distal end portion (59) is thinner as it is farther from the stator core (36). Therefore, the inclined shape of the outer peripheral side surface (64) reduces the stress acting on the tip (59) due to the winding of the winding (39), and the stress concentrates on the base of the tip (59) and cracks. Can be prevented.
[0015]
In the invention of claim 2, in the invention of claim 1, the outer peripheral side surface (64) of the tip portion (59) of the tooth portion (57) is at least 10 degrees from the direction orthogonal to the tooth portion main body (58). Since it is inclined, it is possible to more reliably prevent the occurrence of cracks at the base portion of the tip portion (59) of the tooth portion (57).
[0016]
In the invention of claim 3, in the invention of claim 2, a curved surface portion (65) is provided at the boundary portion between the outer peripheral side surface (64) and the tooth portion main body (58) at the tip portion (59) of the tooth portion (57). ) Is further provided, it is possible to further reduce the stress concentration on the boundary portion and more reliably prevent the insulating member (37, 38) from cracking.
[0017]
According to a fourth aspect of the present invention, in the third aspect of the present invention, the curved surface portion (65) at the boundary portion between the outer peripheral side surface (57) and the tooth portion main body (58) at the tip portion (59) of the tooth portion (57). ) Is 2 mm or more, it is possible to more reliably prevent the insulating member (37, 38) from cracking at this boundary portion.
[0018]
Further, in the invention of claim 5, in the invention of any one of claims 1 to 4, the tooth portion (57) is arranged on the inner peripheral side of the stator core (36). The insulating member (37, 38) can effectively prevent cracks from occurring at the base of the tip (59) of the tooth (57), and the rotor (35) by tilting the tip (59). And the rotor (35) can be effectively prevented from causing a rotation failure.
[0019]
Further, in the invention of claim 6, in the invention of any one of claims 1 to 5, the winding (39) is wound around each tooth portion of the stator core (36). Therefore, the tip portion (59) of the tooth portion (57) in the insulating member (37, 38) receives a larger force from the winding (39), but in this case also the insulating member (37, 38) ) Can be effectively prevented from cracking at the base of the tip (59).
[0020]
In the invention of claim 7, since the compressor is provided with the electric motor of any one of claims 1 to 6, a highly reliable compressor can be obtained.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0022]
In FIG. 1, (30) is a compressor motor which drives the compression mechanism (20) for compressing a working fluid, and this compressor motor (30) comprises the electric motor said by this invention. The compression mechanism (20) and the compressor motor (30) are accommodated in the casing (10) to constitute a hermetic compressor. For example, the compressor is connected to a refrigerant circuit (not shown) in which a refrigerant as a working fluid circulates and performs a refrigeration cycle operation, and is used as an air conditioner or a compressor of a refrigeration apparatus (not shown).
[0023]
The casing (10) is composed of an elongated pressure vessel that is elongated vertically. The compressor motor (30) is disposed at the approximate center in the casing (10), and the compression mechanism (20) is disposed below the compressor motor (30). The compression mechanism (20) and the compressor motor (30) are connected by a drive shaft (31) disposed so as to extend vertically in the casing (10).
[0024]
A suction pipe (15) connected to the compression mechanism (20) is inserted in the lower part of the casing (10), and a discharge pipe (16) is inserted in an airtight manner at the upper end. Further, a terminal (17) that is connected to an external power source (not shown) and supplies power to the compressor motor (30) is provided at the upper end of the casing (10).
[0025]
The compression mechanism (20) includes a cylinder (21) and a rotary piston (25) disposed in the cylinder (21). The cylinder (21) is disposed concentrically with the casing (10) and is welded to the inner surface of the casing (10). The cylinder (21) is formed with a shaft hole (23) penetrating the central portion in the vertical direction, and the drive shaft (31) is rotatably fitted in the shaft hole (23). The drive shaft (31) is integrally formed with an eccentric portion (32) fitted into the rotary piston (25). A compression chamber (26) is defined in the cylinder (21), and the rotary piston (25) swings and revolves in the compression chamber (26) as the drive shaft (31) rotates. As a result, the refrigerant is compressed.
[0026]
On the other hand, the compressor motor (30) includes a stator (34) as a stator and a rotor (35) as a rotor.
[0027]
The stator (34) includes a cylindrical stator core (36), and an upper insulator (37) and a lower insulator (38) as insulating members disposed at the upper and lower ends of the stator core (36). An inter-tooth insulator (not shown) disposed between the teeth of the stator core (36), and both insulators (37, 38) and the inter-tooth insulator are wound on the teeth of the stator core (36). And a three-phase winding (39) to be mounted. The stator core (36) is shrink-fitted into the casing (10). The stator (34) is configured to generate a rotating magnetic field by energizing each winding (39) through the terminal (17). Details of the stator core (36) and the insulators (37, 38) will be described later.
[0028]
The rotor (35) includes a cylindrical rotor core (41) in which a large number of electromagnetic steel sheets as magnetic materials are laminated in the axial direction, and upper and lower ends of the rotor core (41). And an end plate (42) provided. The rotor core (41) and the end plate (42) are integrated by a rivet (43) penetrating both in the axial direction.
[0029]
The upper part of the drive shaft (31) is shrink-fitted and fixed at the center of the rotor (35), and the rotor (35) is located between the stator (34) and the stator (34). An air gap (47) with a slight gap is formed and is rotatably arranged. Further, as shown in FIG. 2, a flat permanent magnet (45) is fitted in the rotor (35) so as to form square sides around the drive shaft (31). As a result, the rotor (35) rotates inside the stator (34) by a rotating magnetic field generated in the stator (34), thereby applying a rotational driving force to the compression mechanism (20), and the compression mechanism ( 20) to drive.
[0030]
Further, as shown in FIGS. 1 and 2, an oil separation plate (46) made of a disc having substantially the same diameter as the rotor (35) is disposed at the upper end of the rotor (35). The oil separation plate (46) is for causing the lubricating oil flowing together with the refrigerant flowing out from the air gap (47) between the stator (34) and the rotor (35) to flow in the radial direction. .
[0031]
An accumulator (not shown) is connected to the suction pipe (15) of the compressor so that the refrigerant separated from the liquid refrigerant flows into the compressor.
[0032]
As shown in FIG. 2, the stator core (36) includes an annular main body (51) and the main body so as to protrude radially inward from the inner end of the main body (51). (51) and a plurality of thin plates provided with teeth (not shown) as tooth portions formed integrally with each other are laminated. A plurality of (six in this embodiment) teeth of each thin plate are formed at equal intervals in the circumferential direction. In addition, at the tip of each tooth, there is provided a width expanding portion (not shown) that protrudes so as to expand the circumferential width to both sides. The inner peripheral surface of the widened portion, that is, the tip end surface of the tooth is formed as an arc surface having a slightly larger curvature radius than the outer diameter of the rotor (35).
[0033]
The upper insulator (37) and the lower insulator (38) of the stator core (36) are both made of resin having substantially the same structure. Therefore, here, the upper insulator (37) will be described in detail, and the lower insulator (38) will be denoted by the same reference numerals and the description thereof will be omitted. That is, as shown in FIGS. 2 and 3, the upper insulator (37) includes an annular part (56) as an annular main part corresponding to the main part (51) of the stator core (36). And a teeth pressing portion (57) which is a tooth portion having a shape corresponding to the teeth. The annular part (56) has an inner peripheral surface that is flush with the inner peripheral surface of the main body (51) of the stator core (36), and the outer peripheral surface is inside the outer peripheral surface of the main body (51). And is formed in a cylindrical shape extending in the up-down direction.
[0034]
As shown in FIGS. 4 to 6, the teeth pressing portion (57) protrudes inward from the lower end of the annular portion (56) and is formed in a substantially rectangular flat plate shape when viewed from above. A presser part main body (58) as a tooth part main body is provided, and the tip of the presser part main body (58) extends upward in a shape corresponding to the width-enlarging portion of the teeth in the stator core (36). An inner presser portion (59) which is the tip portion according to the present invention is provided upright. That is, the inner presser part (59) stands up from the presser part body (58) so as to extend on the opposite side of the stator core (36). Then, the upper end portion of the winding (39) is in a concave space formed by the annular portion (56) and the presser portion main body (58) and the inner presser portion (59) of the teeth presser portion (57). It is to be accommodated.
[0035]
As shown in FIG. 4, the inner pressing portion (59) is formed in a substantially semicircular shape having an arc surface on the upper side when viewed from the inner side. Moreover, as shown in FIG.4 and FIG.6, a pair of front-end | tip extension part (60) extended toward a lower side rather than the teeth press part (57) is formed in the both ends in the lower end of an inner side press part (59). Has been.
[0036]
As shown in FIG. 5, both ends in the circumferential direction on the upper surface of the teeth pressing portion (57) are formed in a curved surface shape. A pair of teeth extending portions (61) extending downward and to the lower end position of the tip extending portion (60) are formed at both ends in the circumferential direction of the teeth pressing portion (57). This teeth extension part (61) is for pinching the teeth of the stator core (36).
[0037]
The upper surface, the lower surface and the outer peripheral surface of the annular portion (56) of the upper insulator (37), the lower surface of the presser body (58), and the inner peripheral surface of the inner presser portion (59) are arranged in the radial direction and the axial direction. A concave groove (63) is formed to extend. The concave groove (63) is formed in the same manner in each of the teeth pressing portions (57), and is formed in a portion that bisects each of the teeth pressing portions (57) in the circumferential direction.
[0038]
As a feature of the present invention, the inner pressing portion (59) of the upper insulator (37) has its outer peripheral side surface (64) facing upward so that the radial thickness becomes thinner toward the upper side (tip side). It inclines so that it may go to an inner peripheral side. Further, the inclination angle θ of the outer peripheral side surface (64) from the direction orthogonal to the presser body (58) is 10 degrees or more. In other words, the winding (39) located on the inner peripheral end side receives a force such that the inner pressing portion (59) tilts inward, but by giving the outer peripheral side surface (64) an inclination, The stress generated at the boundary portion between the presser portion main body (58) and the inner presser portion (59) of the teeth presser portion (57) is relieved. The side surface on the inner peripheral side of the inner pressing portion (59) is substantially parallel to the direction orthogonal to the pressing portion main body (58) of the teeth pressing portion (57).
[0039]
Further, the boundary part between the outer peripheral side surface (64) of the inner presser part (59) and the upper surface of the presser part body (58) is located at the boundary part between the presser part body (58) of the inner presser part (59). A curved surface portion (65) is provided for relieving the generated stress. The curved surface portion (65) has a radius of curvature of 2 mm or more, and is formed over the entire width of the presser portion main body (58).
[0040]
On the other hand, the lower insulator (38) of the stator core (36), as described above, is made of resin in the same shape as the upper insulator (37), and the upper insulator (37) Is disposed upside down at the lower end of the stator core (36) (see FIG. 1). The lower insulator (38) includes, as shown in FIGS. 3 to 6, an annular part (56) having a shape corresponding to the shape of the main body part (51) of the stator core (36), and the stator. Teeth presser portion (57) having a shape corresponding to the teeth of the core (36), and an inner presser erected so as to extend downward from the tip of the presser portion main body (58) of the teeth presser portion (57). Part (59). Then, in the lower insulator (38), the inner presser portion (59) is inclined so that the outer peripheral side surface (64) is directed downward toward the inner peripheral side so that the radial thickness becomes thinner toward the lower side. Yes. In addition, a curved surface portion (65) having a radius of curvature of 2 mm or more is provided at a boundary portion between the outer peripheral side surface (64) of the inner pressing portion (59) and the lower surface of the pressing portion main body (58).
[0041]
The winding (39) is a so-called concentrated winding method in which one of the three-phase windings (39) is wound around each tooth of the stator core (36). Yes. These windings (39) are alternately wound from the proximal end to the distal end in each tooth. The same-phase windings (39) are attached to the teeth facing each other in the diameter direction of the stator core (36). By adopting the concentrated winding method in this way, the magnetic flux density can be increased and a stronger rotational driving force can be obtained.
[0042]
Then, the operation | movement operation | movement of the compressor which accommodated the compressor motor (30) which concerns on this embodiment is demonstrated. First, when power is supplied to the compressor motor (30) through the terminal (19), the winding (39) of the stator core (36) is energized to generate a rotating magnetic field in the stator (34). Due to this rotating magnetic field, the permanent magnet (45) of the rotor (35) receives a magnetic force to rotate the rotor (35). The rotation of the rotor (35) causes the drive shaft (31) to rotate, and the rotary piston (25) swings and revolves within the compression chamber (26). As a result, the low-pressure refrigerant is sucked into the compression chamber (26) through the suction pipe (15) and compressed. When the pressure in the compression chamber (26) reaches a predetermined pressure, the high-pressure refrigerant is discharged from the compression chamber (26) into the casing (10). The high-pressure refrigerant in the casing (10) is discharged from the discharge pipe (16) and circulates through a refrigerant circuit (not shown). Further, the refrigerant circulating through the refrigerant circuit is sucked into the compressor through the suction pipe (15), and this circulation is repeated.
[0043]
At that time, according to the compressor motor (30), the teeth presser portion (57) of the insulator (37, 38) in the stator (34) has an inner presser so as to extend to the opposite side of the stator core (36). Since the outer side surface (64) is inclined so that the inner pressing part (59) is further away from the stator core (36), the outer side surface (64) is inclined. The winding (39) is a concentrated winding method in which each of the teeth holding portions (57) is wound respectively, and the inner holding portion (59) of the insulator (37, 38) is moved from the winding (39). Even when receiving a greater force, the winding (39) winding reduces the stress generated in the standing part of the inner presser part (59), and cracks occur in the standing part of the inner presser part (59). Can be prevented.
[0044]
Further, the outer peripheral side surface (64) of the inner pressing portion (59) of the insulator (37, 38) is inclined by 10 degrees or more from the direction orthogonal to the pressing portion main body (58) of the teeth pressing portion (57). For this reason, it is possible to more reliably prevent the occurrence of cracks at the standing portion of the inner pressing portion (59) of the insulator (37, 38).
[0045]
Furthermore, since the curved surface portion (65) is provided at the boundary portion between the outer peripheral side surface (64) of the inner pressing portion (59) of the insulator (37, 38) and the pressing portion main body (58), It can prevent more reliably that a crack generate | occur | produces in an insulator (37,38).
[0046]
Since the curved surface portion (65) of the boundary portion has a radius of curvature of 2 mm or more, the outer side surface (64) of the inner pressing portion (59) of the insulator (37, 38) and the pressing portion main body (58) It is possible to more reliably prevent the insulator (37, 38) from cracking at the boundary portion.
[0047]
In addition, it is possible not only to effectively prevent the occurrence of cracking in the standing portion of the inner pressing portion (59) of the insulator (37, 38) in this way, but also to suppress the inward tilting of the inner pressing portion (59). It is possible to prevent the inner pressing portion (59) from contacting the rotor (35) due to the tilting, and to effectively prevent the rotor (35) from causing a rotation failure.
[0048]
Other Embodiments of the Invention
In the above embodiment, the outer side surface (64) of the inner presser part (59) is inclined at least 10 degrees from the direction orthogonal to the presser part body (58). Depending on the amount, the inclination may be close to the orthogonal direction (inclination angle θ is small). In short, it suffices that the outer side surface (64) of the inner pressing portion (59) is inclined so that the thickness decreases as the distance from the stator core (36) increases.
[0049]
Further, in the above embodiment, the curved surface portion (65) at the boundary portion between the outer peripheral side surface (64) of the inner presser portion (59) and the presser portion main body (58) of the teeth presser portion (57) may be omitted. . The radius of curvature of the curved surface portion (65) may be less than 2 mm depending on the winding amount of the winding (39). However, in order to effectively prevent the inner presser portion (59) from tilting and cracking at the base portion, it is preferable to employ the configuration of the above embodiment.
[0050]
In the above embodiment, the stator (34) is a so-called concentrated winding method in which the winding (39) is wound around each of the teeth, but the present invention is not limited to such a configuration, For example, the present invention may be applied to a so-called distributed winding method in which the windings (39) overlap each other and are wound so as to straddle a plurality of teeth.
[0051]
【The invention's effect】
As described above, according to the first aspect of the present invention, in the insulating members (37, 38) arranged on both sides in the axial direction of the stator core (36) of the electric motor, the teeth of the stator core (36) Since the outer peripheral side surface (64) of the distal end portion (59) of the tooth portion (57) corresponding to is inclined, the winding (39) is wound to be generated at the standing portion of the distal end portion (59). The stress is reduced, and cracks can be prevented from occurring at the standing portion of the tip end portion (59).
[0052]
Further, according to the invention of claim 2, the outer peripheral side surface (64) of the distal end portion (59) of the insulating member (37, 38) is inclined by 10 degrees or more from the direction orthogonal to the tooth portion main body (58). Therefore, it is possible to more reliably prevent cracks from occurring at the base portion of the tip end portion (59) of the insulating member (37, 38).
[0053]
According to the invention of claim 3, the curved surface portion (65) is provided at the boundary portion between the outer peripheral side surface (64) of the distal end portion (59) of the insulating member (37, 38) and the tooth body (58). As a result, it is possible to more reliably prevent the insulating member (37, 38) from cracking at the boundary portion.
[0054]
According to the invention of claim 4, the curvature of the curved surface portion (65) at the boundary portion between the outer peripheral side surface (64) of the distal end portion (59) of the insulating member (37, 38) and the tooth body (58). Since the radius is set to 2 mm or more, it is possible to more reliably prevent the insulating member (37, 38) from cracking at the boundary portion.
[0055]
According to the invention of claim 5, since the tooth portion is arranged on the inner peripheral surface of the stator core (36) and the rotor (35) is arranged inside thereof, the insulating member ( 37, 38) can effectively prevent cracks from occurring at the base of the tip (59), and can prevent contact with the rotor (35) due to tilting of the tip (59). It is possible to effectively prevent the rotor (35) from causing rotation failure.
[0056]
According to the invention of claim 6, since the winding (39) is wound around each tooth portion of the stator core (36), the tip of the insulating member (37, 38) is provided. The part (59) receives a greater force from the winding (39), but even with such a configuration, the insulating member (37, 38) cracks at the base of the tip part (59). Can be effectively prevented.
[0057]
According to the invention of claim 7, a highly reliable compressor can be obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a configuration of a compressor according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along the line II-II in FIG.
FIG. 3 is a plan view of an insulator.
4 is a view taken in the direction of arrows IV-IV in FIG. 3;
5 is a cross-sectional view taken along line VV in FIG. 3. FIG.
6 is a cross-sectional view taken along line VI-VI in FIG.
[Explanation of symbols]
(34) Stator
(35) Rotor
(36) Stator core
(37) Upper insulator
(38) Lower insulator
(39) Winding
(56) Torus
(57) Teeth presser
(58) Presser body
(59) Inner presser part
(64) Outer side
(65) Curved surface

Claims (7)

Insulating members (37, 38) are disposed on both axial sides of the stator core (36), and the winding (39) is wound around the stator core (36) with the insulating members (37, 38) interposed therebetween. In the electric motor
The insulating member (37, 38) includes a tooth part main body (58) and a tip part (59) standing up so as to extend from the tip side of the tooth part main body (58) to the opposite side of the stator core (36). And a tooth part (57) having a corresponding to the tooth part of the stator core (36),
The electric motor according to claim 1, wherein the outer peripheral side surface (64) of the tip end portion (59) is inclined so that the thickness of the tip end portion (59) decreases as the distance from the stator core (36) increases. In claim 1,
The electric motor characterized in that the outer peripheral side surface (64) of the distal end portion (59) of the tooth portion (57) is inclined by 10 degrees or more from a direction orthogonal to the tooth portion main body (58). In claim 2,
An electric motor characterized in that a curved surface portion (65) is provided at a boundary portion between the outer peripheral side surface (64) and the tooth portion main body (58) at the tip portion (59) of the tooth portion (57). In claim 3,
The electric motor characterized in that the curvature radius of the curved surface portion (65) is 2 mm or more. In any one of Claims 1-4,
An electric motor characterized in that a tooth portion (57) is disposed on the inner peripheral surface side of the stator core (36), and a rotor (35) is disposed inside the tooth portion. In any one of Claim 1 to 5,
An electric motor characterized in that a winding (39) is wound around each tooth portion of the stator core (36). A compressor comprising the electric motor according to any one of claims 1 to 6.

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