JP4311047B2 - Motor stator - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a coil wound directly around the tooth portions of the rotary electric motive stator core such as an induction motor rotating electric motor stator.
[0002]
[Prior art]
2. Description of the Related Art In recent years, a rotary motor such as an induction motor is often used as a direct-winding motor including a brushless DC motor in order to improve the size and performance. A plurality of teeth are provided at equal intervals around the inner surface or the outer surface of the electric motor stator, and a coil is directly wound around these teeth portions.
[0003]
A direct-winding motor stator such as a general brushless DC motor has a plurality of teeth in which a stator iron core protrudes from a back yoke, and is covered with an insulator as an insulating member, and a coil is connected to the teeth via the insulator. It is wound directly and a gap 8 is formed between adjacent coils. The insulating member arrange | positioned in the clearance gap between the adjacent coils wound by the direct winding type motor stator is shown. A welded portion is formed at both ends of the insulating sheet, and the welded portions at both ends are bonded together by heat welding to form an annular shape. (For example, see Patent Literature)
[0004]
[Patent Literature]
JP 2002-233092 A JP 08-149730 A
[Problems to be solved by the invention]
In the stator of the conventional direct-winding motor as described above, only one coil wound around the teeth can be mounted on one insulating sheet, and in order to insulate all the coils, the quantity of teeth Only need quantity of insulation sheet. In addition, since the minimum number of insulation sheets installed at one interval between teeth requires half the number of insulation sheets, there is a problem that the number of parts increases and workability deteriorates.
[0006]
In addition, a resin-molded product is attached to the tip of the tooth because of the assembly method of attaching it from the tip of the stator core teeth (open groove on the rotor side) after bonding both ends of the insulating sheet in advance to form an annular shape. When the wall of the insulator is mounted and the wall position of the insulator is higher than the coil end height, there is a problem that it is difficult to mount the insulating sheet.
[0007]
In addition, when the wall position of the insulator is higher than the coil end, it can be mounted if the insulating sheet is formed in an annular shape larger than the wall shape, but in this case, the insulating sheet cannot be brought into close contact with the coil end. There is a possibility that the insulating sheet may be displaced from the coil end when fixed with a thread, and there is a problem that the insulating sheet protrudes to the rotor side and the insulating effect is reduced.
[0008]
Further, since the insulating sheet is formed in an annular shape, there is a problem of heat dissipation that covers the entire periphery of the coil end and hardly transfers the heat generated by the coil to the stator core.
[0009]
The present invention has been made to solve the above-described problems.As a result, the assembly between the adjacent coils is improved with as few parts as possible to improve the assemblability, and a highly reliable motor stator can be obtained. It is intended to provide.
[0010]
[Means for solving problems]
An electric motor stator according to the present invention includes a stator iron core having a stator back yoke portion in which a rotor is installed on an inner diameter side or an outer diameter side of the stator, and a plurality of teeth portions protruding from the back yoke portion. A plurality of coils wound directly around the plurality of teeth portions via an insulator, and alternately viewed from the inner peripheral side of the stator core, the coil ends of the coils adjacent to one strip-shaped insulating sheet The plurality of coils are attached so as to cover each other in a crank shape so as to cover them.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
Hereinafter, the details of the electric motor stator according to the first embodiment of the present invention will be described. 1 is a cross-sectional view of the motor stator, FIG. 2 is a cross-sectional view of the motor stator, and FIG. 3 is a vertical cross-sectional view of the motor stator. In the drawing, a stator core 2 of the stator 1 has a plurality of teeth 4 protruding from a back yoke 3 and is covered with an insulator 5 which is an insulating member. The coil 6 is wound directly around the tooth 4 via the insulator 5, and the adjacent coils 6 are insulated by a strip-shaped insulating sheet 7.
[0012]
When the diameter of the coil 6 shown in FIG. 2 is r1, the width of the strip-like insulating sheet 7 is w1, and the inner dimension from the rotor side of the teeth 4 of the insulator 5 to the back yoke 3 is w2, w2-r1 / 2 <w1 ≦ w2.
[0013]
Further, the height from the upper part of the coil 6 wound around the insulator 5 mounted on the stator core 2 shown in FIG. 3 to the end surface portion of the stator core 2 is h1, and the insulator 5 mounted on the stator core 2 When the height from the upper part of the inner wall 5b arranged on the inner diameter side to the end face of the stator core 2 is h2, h1 <h2.
[0014]
By the above w2-r1 / 2 <w1 ≦ w2 and h1 <h2, the strip-like insulating sheet 7 can be prevented from being displaced by being caught on the inner wall 5b of the insulator, and the coil 6 is insulated without protruding to the rotor side. It becomes possible to do.
[0015]
FIG. 4 is a main part schematic diagram showing an inner rotor type motor equipped with a belt-like insulating sheet 7, and the rotor 8 is arranged on the inner diameter side of the stator 1. The strip-shaped insulating sheet 7 is formed in a crank shape between the coils 6 and covers the coil ends of the adjacent coils 6 alternately up and down.
[0016]
FIG. 5 is a view showing an outer rotor type motor equipped with a belt-like insulating sheet 7, and the rotor 8 is arranged on the outer diameter side of the stator 1. The strip-shaped insulating sheet 7 is formed by alternately covering the coil ends of adjacent coils 6 in the same manner as the coil 6 of the inner rotor type electric motor shown in FIG.
[0017]
FIG. 6 is a development view of the strip-shaped insulating sheet 7 that insulates the coils. The strip-like insulating sheet 7 is, for example, a film-like strip-like sheet of PET, PEN, PPS, or aramid paper having a thickness of about 0.075 mm to 0.3 mm and having elasticity.
[0018]
FIG. 7A is a perspective view showing a configuration before the assembly of the electric motor stator. The belt-like insulating sheet 7 is inserted from the rotor-side gap 9a or the coil end-side gap 9b of the stator 1 so as to follow the coil 6. It is mounted between the coils 6 while being formed into a crank shape.
[0019]
FIG. 7B is a perspective view showing the structure after assembly, and the coil 6 wound around each tooth is insulated by one strip-shaped insulating sheet 7. Both ends of the belt-like insulating sheet 7 are fixed to the coil end with an adhesive tape or the like, or both ends are adhesively fixed with an adhesive tape or heat welding.
[0020]
FIG. 8 is a partially developed view in which a thin-walled stator iron core is developed in a straight line, and shows an electric motor stator equipped with a belt-like insulating sheet 7. As shown in the figure, the stator iron core 2 includes a back yoke 3 It is the example used for the thin connection type | mold stator core 10 which connected the outer-diameter side by thin wall.
[0021]
FIG. 9 is a partially developed view in which the rotatable connecting stator core 11 is developed in a straight line, and shows a rotatable connecting type electric motor stator equipped with a belt-like insulating sheet 7. Each of the teeth 4 is divided by a back yoke 3, and a rotatable connecting stator core 11 is formed by pressing and punching so that a convex portion is provided on the front surface of the back yoke 3 portion and a concave portion is provided on the back surface. This is an example used for the rotatable connecting stator core 11 in which a through hole is provided in the through hole and the through hole is rotatable through a pin.
[0022]
Since the electric motor stator according to the first embodiment can insulate between a plurality of adjacent coils 6 with a single strip-shaped insulating sheet 7, and the surface of the plurality of coils 6 is mounted in a crank shape, Either one of the upper and lower sides of the coil end portion of each coil 6 is in a state where the surface of the coil 6 is always released, and the heat dissipation effect is high. For this reason, it is possible to provide an electric motor stator that is inexpensive and has a small number of parts, is easy to assemble, and has a high heat dissipation effect.
[0023]
Embodiment 2. FIG.
An electric motor stator according to Embodiment 2 of the present invention shown in FIGS. 10 to 12 will be described. FIG. 10 is a perspective view showing the configuration of the motor stator. Protrusions 5 c are formed in advance on the outer wall 5 a on the outer diameter side of the insulator 3 incorporated in the stator core 2, and provided on both ends of the strip-shaped insulating sheet 7. By inserting the mounting holes 12a processed in the mounting portion 12 into the protrusions 5c of the outer wall 5a, the belt-like insulating sheet 7 can be easily fixed without using a secondary member.
[0024]
As an assembling procedure, the insertion hole 12a of the one attachment portion 12 is inserted into the protrusion 5c formed in the insulator 5, the belt-like insulating sheet 7 is wound around the coil end, and finally the attachment hole 12a of the other attachment portion 12 is wound. Is inserted into another protrusion 5c and fixed.
[0025]
The protrusion 5c formed on the insulator 5 may be disposed on one or both of the outer wall 5a and the inner wall 5b, and may be disposed on one or both of the upper side and the lower side of the insulator 5. FIG. 10 shows a mounting example of an inner rotor type electric motor in which a rotor (not shown) is arranged on the inner diameter side of the stator 1, and shows a state in which the protrusion 5c is installed on the outer wall 5a. The installation position of the protrusion 5c is preferably on the outer wall 5a (on the side opposite to the rotor) of the insulator 5 because the distance between the end of the strip-shaped insulating sheet 7 and the rotor is large.
[0026]
In the second embodiment, it is possible to insulate all the coils 6 with a single strip-shaped insulating sheet 7, but it is also possible to divide and install a plurality of coils. Depending on the size of the electric motor stator and the number of teeth, the number of divisions can be adjusted to be excellent in material yield and assembly. FIG. 10 shows an example in which the strip-shaped insulating sheet 7 is divided into a plurality of sheets and the four coils 6 are insulated by one strip-shaped insulating sheet 7. The positions of the protrusions 5c formed on the insulator 5 are arranged in one of the upper and lower directions when the number of the insulated coils 6 is an even number, and both in the upper and lower directions when the number is odd.
[0027]
FIG. 11 (a) shows a development view of the motor stator, in which the thin linked stator core 10 with the belt-like insulating sheet 7 attached is linearly developed. This is an example in which the coils 6 are insulated from each other. The shape of the protrusion 5c may be straight as shown in FIG. 11 (a), but if it is formed on the key-like protrusion 5d in FIG. 11 (b) or the mushroom-like protrusion 5e in FIG. Engagement with the mounting hole 12a of the mounting portion 12 of the insulating sheet 7 is improved and it is difficult to come off, and the fixing force of the strip-shaped insulating sheet 7 is improved.
[0028]
FIG. 12A is a development view of the strip-shaped insulating sheet 7. Mounting holes 12 a are formed in the mounting portions 12 at both ends of the strip-shaped insulating sheet 7. If the mounting hole 12a is processed with a precision mold composed of a punch and a die, a highly accurate round hole, elliptical hole, square hole or the like can be formed. On the other hand, in the case of punching and forming with a simple die that is a relatively inexpensive die, in which a blade is press-fitted into a plywood material, the workability of the mounting hole 12a is inferior when the hole diameter is a small diameter of about 5 mm.
[0029]
FIG. 12B shows a shape formed in the attachment portions 12 at both ends of the belt-like insulating sheet 7 formed as a half-moon cut 12b. Since this is not a punching process unlike hole drilling, it can be handled with a simple mold, and the assemblability is equivalent to that provided with the mounting hole 12a. Thereby, the strip | belt-shaped insulation sheet 7 which can be manufactured with an inexpensive metal mold | die can be integrated in an electric motor stator.
[0030]
Embodiment 3 FIG.
The strip-shaped insulating sheet in Embodiment 3 shown in FIGS. 13 to 18 and FIG. 19 will be described. FIG. 13 shows a longitudinal sectional view of the electric motor stator. In general, in the case of a series-winding motor stator, when the density of the wound coil 6 is increased, the arrangement position of the coil 6 tends to be uneven in the height direction, and the high portion of the coil end is the outer wall 5a of the insulator. It is often close to the side or the inner wall 5b side. FIG. 13 is an example showing that the high portion of the coil end is close to the outer wall 5a on the insulator outer diameter side.
[0031]
FIG. 14A is a development view of the first strip-shaped insulating sheet 7 and has a linear strip shape. FIG. 14B is a perspective view (the stator core and the insulator are omitted) in which the coil end shape and the first strip insulating sheet 7 are mounted. The first strip-like insulating sheet 7 has a straight simple shape, has good workability, has few members that become waste when continuously punched from a hoop-like material, and improves the yield. However, as shown in FIG. 14A, a gap may be generated between the coil 6 and the first strip-shaped insulating sheet 7.
[0032]
15 and 17 to 19 are development views of the insulating sheet for the stator of the motor, and a perspective view showing the state of the coil end on which the belt-like insulating sheet is mounted. 15 to 18, (a) is a development view of an insulating sheet that insulates between the three coils 6, and (b) is a coil in which the height of the wound coil 6 is uneven. The insulation sheet mounting perspective view (a stator iron core and an insulator are omitted) in which a strip-shaped insulating sheet is mounted in an end shape is shown.
[0033]
The second strip-shaped insulating sheet 13 shown in FIG. 15A is obtained by refracting (θ1) the inner diameter side 13a having a lower coil end and the outer diameter side 13b having a higher coil end shown in FIG. 15B. is there. By attaching this refracted portion to the coil end portion, it is possible to make it closely contact with the coil end portion having a non-uniform height, and the insulation reliability is improved.
[0034]
FIG. 16 is a main part development view showing the inner rotor type electric motor stator. In the case of a series-winding motor stator, the lead wire 6a of the coil 6 that is generally wound is often tangled to the outer wall 5a on the insulator outer diameter side. At this time, if the lead wire 6a is arranged on the upper part of the coil 6, it becomes difficult to adhere the strip-shaped insulating sheet to the coil end. However, the cut-out process 14a applied to the third strip-shaped insulating sheet 14 Because of the shape to avoid, the adhesion is not hindered.
[0035]
The third strip-shaped insulating sheet 14 in FIG. 17A is provided with a cut-out portion 14a corresponding to the portion having a high coil end shown in FIG. 15B or the lead wire 6a shown in FIG. As a result, the third belt-like insulating sheet 14 having a straight belt-like shape can be brought into close contact with the coil end portion having a non-uniform height as shown in FIG. Improves.
[0036]
The fourth strip-shaped insulating sheet 15 in FIG. 18A is provided with an end notch 15a and a center notch 15b on the coil end portion shown in FIG. The notches 15a and the center notches 15b spread in a net shape, and even the fourth strip-shaped insulating sheet 15 having a linear shape can be brought into close contact with the coil end portion having a non-uniform height shown in FIG. In addition, since a film-like sheet having elasticity is used, the portion spread in a net shape has a spring property, and the engagement between the attachment hole 12a of the attachment portion 12 and the insulator 5 is enhanced by the spring back, and the band-like insulating sheet Since the displacement can be prevented, the insulation reliability is improved.
[0037]
The above-described third embodiment is an example, and the first embodiment, the second embodiment, or the third embodiment may be combined or modified for convenience. For example, the fifth strip insulating sheet 16 of FIG. 19A has a substantially linear shape similar to the third strip insulating sheet 14 shown in FIG. 17A, and FIG. A diagonal narrow cutout portion 16a is provided at a position corresponding to the coil end portion shown. FIG. 19 (c) shows a state in which the fifth strip-shaped insulating sheet 16 is twisted half a turn in accordance with the bending center 17 connecting the vertices of the diagonal cutout process 16a. As a result, it is refracted (θ2) like the second strip-shaped insulating sheet 13 shown in FIG. 15A, and the twisted portion 16b, which is the refracted portion, is attached to the coil end portion shown in FIG. 19B. Thus, the coil end portion having a non-uniform height can be brought into close contact with the coil end portion.
[0038]
Further, the fifth strip-shaped insulating sheet 16 in FIG. 19A has a substantially linear shape with a high yield, but after forming on the fifth strip-shaped insulating sheet 16 in FIG. θ2 can form an angle smaller than the angle θ1 of the refracting portion shown in the second strip-shaped insulating sheet 13 of FIG. 15A, and the adhesion to the coil is further improved.
[0039]
Further, since the refracting portion is formed by twisting half turn at the bending center 17, the angle θ2 can be freely changed, and is closely attached to the coil end portion having a non-uniform height by a natural body. This expands versatility and can absorb variations in coil end height, such as when the amount of coil winding is changed, so insulation of multiple types of motor stators does not require a special shape. Can be used. In addition, as a process of assembling the fifth strip-shaped insulating sheet 16 to the motor stator, the fifth strip-shaped insulating sheet 16 may be mounted after being twisted by half a rotation at the bending center 17 beforehand. It is also possible to insert the half-moon-shaped cut 12b into the insulator 5 and then wind it around the coil end while being mounted between the coils 6 while being twisted half turn at the bending center 17.
[0040]
Furthermore, since the fifth strip-shaped insulating sheet 16 uses a film-like member having elasticity, the twisted portion 16a has a spring property, and the engagement between the half-moon-shaped cut 12b and the insulator is enhanced by the spring back. Further, it is possible to prevent the belt-like insulating sheet from being displaced.
[0041]
In the third embodiment, it is possible to provide an electric motor stator that is inexpensive and has a small number of parts, is easy to assemble, and has high insulation performance. In addition, since adhesive tape, which is a secondary material, is not required for fixing the belt-like insulating sheet, it is possible to prevent clogging of the refrigerant cycle due to elution of adhesives, etc., when the electric motor is mounted in an atmosphere of refrigerant, refrigeration oil, etc. It can be used in a compressor that compresses refrigerant.
[0042]
In addition, in a method for controlling a compressor equipped with the motor stator, an inverter with a boost function may be used for the purpose of improving efficiency and extending the operating range. At this time, the voltage supplied to the motor stator increases, and the potential difference between the coils 6 may increase. However, by disposing the strip insulating sheet 7 between the coils 6, the reliability of insulation is improved, The motor stator can be used in a refrigeration cycle using an inverter with a boost function.
[0043]
【The invention's effect】
An electric motor stator according to the present invention includes a stator iron core having a stator back yoke portion in which a rotor is installed on an inner diameter side or an outer diameter side of the stator, and a plurality of teeth portions protruding from the back yoke portion. A plurality of coils wound directly around the plurality of teeth portions via an insulator, and alternately viewed from the inner peripheral side of the stator core, the coil ends of the coils adjacent to one strip-shaped insulating sheet Since the plurality of coils are attached in a crank shape so as to cover them, the assembly workability can be improved and insulation between adjacent coils can be performed with a small number of parts.
[0044]
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an electric motor stator according to Embodiment 1 of the present invention.
FIG. 2 is a cross-sectional view of a main part of an electric motor stator according to Embodiment 1 of the present invention.
FIG. 3 is a longitudinal sectional view of an electric motor stator according to Embodiment 1 of the present invention.
FIG. 4 is a schematic diagram showing an inner rotor type electric motor according to Embodiment 1 of the present invention.
FIG. 5 is a schematic diagram showing an outer rotor type electric motor according to Embodiment 1 of the present invention.
6 is a development view of a strip-shaped insulating sheet according to Embodiment 1 of the present invention. FIG. 7 is an exploded perspective view showing a configuration of an electric motor stator according to Embodiment 1 of the present invention.
FIG. 8 is an essential-part development view showing the thin-walled stator in Embodiment 1 of the present invention.
FIG. 9 is an essential-part development view showing the rotatable coupling type stator according to the first embodiment of the present invention.
FIG. 10 is a perspective view of relevant parts showing the configuration of an electric motor stator according to Embodiment 2 of the present invention.
FIG. 11 is a main part development view showing a configuration of an electric motor stator according to Embodiment 2 of the present invention.
FIG. 12 is a development view of a strip-shaped insulating sheet according to Embodiment 2 of the present invention.
FIG. 13 is a longitudinal sectional view of an electric motor stator according to Embodiment 3 of the present invention.
FIG. 14 is a development view of the first strip-shaped insulating sheet according to Embodiment 3 of the present invention and a perspective view when mounted.
FIGS. 15A and 15B are a development view and a perspective view of the second belt-like insulating sheet according to the third embodiment of the present invention when mounted. FIGS.
FIG. 16 is a main part development view showing an inner rotor type electric motor stator according to Embodiment 3 of the present invention;
FIG. 17 is a development view of a third strip-shaped insulating sheet according to Embodiment 3 of the present invention and a perspective view when mounted.
FIG. 18 is a development view of a fourth strip-shaped insulating sheet according to Embodiment 3 of the present invention and a perspective view when mounted.
FIG. 19 is a development view of a fifth strip-shaped insulating sheet according to Embodiment 3 of the present invention and a perspective view when mounted.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stator, 2 Stator iron core, 3 Back yoke, 4 Teeth, 5 Insulator, 5a Protrusion, 6 Coil, 7 1st strip | belt-shaped insulation sheet, 8 Rotor, 9a Rotor side clearance, 9b Coil end side clearance, 10 Thin connection stator core, 11 rotatable connection stator core, 12 mounting portion, 12a mounting hole, 12b half-moon cut, 13 second strip insulation sheet, 14 third strip insulation sheet, 14a cutout, 15 4th 15a end cut, 15b center cut, 16th strip insulation sheet, 16a narrow cutout, 16b twisted portion, 17 folding center.

Claims (10)

A stator iron core having a back yoke portion of a stator in which a rotor is installed on an inner diameter side or an outer diameter side of the stator, and a plurality of teeth portions protruding from the back yoke portion, and the plurality of the plurality of stator cores via an insulator. A plurality of coils wound directly on the tooth portion, and the coil ends are alternately covered as viewed from the inner peripheral side of the stator core, with the coil ends of the adjacent coils covered with one strip-shaped insulating sheet. An electric motor stator characterized by being mounted in a crank shape.   2. A strip-like insulating sheet having attachment holes wound around and attached to coil portions at both ends, and a protrusion to be inserted into the attachment hole is provided on an outer wall on the outer diameter side of the insulator. Motor stator.   A semi-moon-shaped cut process is performed on a mounting portion that is wound around and attached to a coil portion at both ends of the belt-shaped insulating sheet, and a protrusion that is inserted into the mounting portion is provided on an outer wall on the outer diameter side of the insulator. The electric motor stator according to Item 1.   The electric motor stator according to claim 1, wherein the belt-shaped insulating sheet insulates the outer peripheral portion of the coil directly wound around a single or a plurality of tooth portions.   A strip-shaped insulating sheet provided with a cut or notched portion in the middle of the sheet, and the strip-shaped insulating sheet is mounted so that the cut end or notched portion is attached to the coil end portion directly wound around the insulator. The motor stator according to claim 1.   6. The electric motor stator according to claim 5, wherein the notched portion of the belt-like insulating sheet is twisted and attached at the coil end portion.   The stator core is an integrally laminated iron core, and the thin stator core or multiple teeth that are laminated and laminated at the back yoke part of the stator core are projected on the surface by press punching. The motor stator according to any one of claims 1 to 6, wherein a concave connecting part core is provided on a back surface of the part, and a laminated rotatable connecting stator core is used.   The electric motor stator according to any one of claims 1 to 7, wherein the belt-like insulating sheet is made of any one of PET, PEN, PPS, and aramid paper.   A compressor comprising the motor stator according to claim 1, wherein refrigerant is compressed by the motor.   A refrigeration cycle, wherein a compressor equipped with the electric motor according to claim 9 is driven by an inverter having a boost function.

Images