JP4940955B2 - Axial gap type motor and compressor - Google Patents

Description

  The present invention relates to an axial gap type motor and a compressor.

  Conventionally, an axial gap type motor includes a rotor and a stator that is opposed to the rotor in the axial direction via an air gap (for example, Japanese Patent Laid-Open No. 2001-136721 (Patent Document 1)). JP 2005-295757 A (Patent Document 2), JP 2005-143276 A (Patent Document 3)).

  The above-mentioned conventional axial gap type motor is desirable in that it can be made thinner and the torque density can be improved by increasing the magnetic pole area.

  In the axial gap type motor, a thrust force is generated in the rotor. For example, two rotors are provided on the opposite sides of one stator, or two stators are provided on the opposite sides of the one rotor. For example, it is possible to counteract the thrust force generated in the axial gap motor.

  In particular, it is desirable to provide two stators for one rotor. This is because the number of rotors is one, so that windage loss can be reduced and it is easy to hold the rotor with respect to the rotating shaft.

  In Patent Document 1, the rotor has a plurality of magnets having two magnetic pole faces having different polarities, one of the magnetic pole faces is opposed to one of the stators, and the other of the magnetic pole faces is opposed to the other of the stators. is doing. Moreover, in Patent Document 2, the rotor is provided with magnets on each of an end surface facing one side of the stator and an end surface facing the other side of the stator. In addition, Patent Document 3 discloses a technique related to the present invention.

  In any of the axial gap type motors of Patent Document 1 and Patent Document 2 described above, the magnet facing the stator is exposed in the gap between the stator and the rotor. For this reason, these magnets are easily affected by a demagnetizing field, and the magnets may be demagnetized.

  Therefore, the present inventor uses both sides of a single layer of magnet as the magnetic poles in the axial direction and links the magnetic flux to the stator windings on both sides, and is magnetically separated for each magnetic pole on both sides of the magnet. An axial gap type motor provided with an iron core has been proposed (Japanese Patent Application No. 2006-193909). This axial gap type motor is described for easy understanding of the present invention, and is not a known technique and is not a conventional technique.

  However, in the above axial gap type motor, since the first magnetic pole surface and the second magnetic pole surface exhibit opposite magnetic poles, the first stator and the second stator are axially opposed to each other via the rotor. When viewed from the side, it must be wound in reverse.

  In that case, the winding direction of the winding machine is reversed between the first stator and the second stator, or the coil is wound around a vertically symmetrical winding frame in advance and then the first stator and the second stator. Each reel must be inserted into the teeth with its coils turned upside down.

However, any of the above methods has a problem that the process is complicated and defects due to an error in the winding direction are likely to occur.
JP 2001-136721 A JP 2005-295757 A JP 2005-143276 A

  Accordingly, an object of the present invention is to provide an axial gap type motor and a compressor using the same that can reduce defects such as a coil winding direction error and a coil end connection error by a simple production process.

In order to solve the above problems, the axial gap type motor of the present invention is
An axial gap type motor comprising: a rotor fixed to a rotating shaft; and a first stator and a second stator facing each other via air gaps on both sides in the axial direction of the rotor,
The first and second stators include a back yoke, teeth provided on the rotor side of the back yoke in the axial direction, and a coil wound around the teeth,
The coil of the first stator and the coil of the second stator are concentrated windings and wound in the same direction as viewed from the rotor side,
In the coil of the first stator, the winding start portion of the coil that is most drawn out from the tooth side is the neutral point side, and in the coil of the second stator, from the side farthest from the teeth. The coil end portion of the coil that has been drawn out is on the neutral point side.

  According to the axial gap type motor having the above-described configuration, the coil of the first stator and the coil of the second stator are concentrated windings, and are wound in the same direction as viewed from the rotor side. By setting the beginning as the neutral point side and the winding end of the second stator coil as the neutral point side, the winding direction of the winding machine can be made the same. Accordingly, the winding direction of the winding machine is reversed between the first stator and the second stator, or the coils are wound around a vertically symmetric winding frame in advance and the first stator and the second stator are turned upside down. There is no need to insert a coil with a coil into the teeth. Therefore, the production process is simple, and defects such as a coil winding direction error and a coil end connection error can be reduced.

In the axial gap type motor of one embodiment,
The rotor is provided with only one layer of one pole magnetized in the axial direction.
Both surfaces of the one magnet facing in the axial direction of the same pole are a first magnetic pole surface and a second magnetic pole surface exhibiting different polarities.

  According to the above-described embodiment, a single magnetic pole magnet is provided in a single layer in the axial direction, and both surfaces of the single magnet facing in the axial direction of the same pole have different polarities from each other. By using the surface and the second magnetic pole surface, the amount of magnets can be reduced, productivity can be further improved, and substantially the same amount of magnetic flux can be linked to the two stators.

In the axial gap type motor of one embodiment,
The rotor is provided with only one layer of a plurality of magnets arranged in the circumferential direction in the axial direction,
Both surfaces of the magnets facing in the axial direction are a first magnetic pole surface and a second magnetic pole surface having different polarities.

  According to the above-described embodiment, a plurality of magnets arranged in the circumferential direction are provided in a single layer in the axial direction, and the first magnetic pole surface and the second magnetic pole that have different polarities on both surfaces facing the axial direction of each magnet. By using the surface, the amount of magnets can be reduced, productivity can be further improved, and substantially the same amount of magnetic flux can be linked to the two stators. Further, by reducing the size of the magnet, it is possible to prevent the magnet from being damaged in the production process.

  In the axial gap type motor of one embodiment, magnetic iron cores magnetically separated for each magnetic pole are provided on both surfaces of the magnet.

  According to the embodiment described above, by providing the magnetic cores magnetically separated for each magnetic pole on both surfaces of the magnet, demagnetization of the magnet can be prevented more efficiently.

Further, the axial gap motor of one embodiment, the neutral point side connection terminal and the power source side connection pin of the coil and the back yoke and the deposited terminal provided in the insulating material of the insulating member, said first The neutral stator side connection terminal of the first stator as viewed from the rotor side , disposed in the circumferential direction on the side of the first stator facing the rotor, and circumferentially disposed on the rotor of the second stator. The arrangement order in the circumferential direction of the power supply side connection terminals is opposite to the arrangement order in the circumferential direction of the neutral point connection terminals and the power supply connection terminals of the second stator as viewed from the rotor side .

  According to the embodiment, the positions of the neutral point side connection terminal and the power supply side connection terminal of the terminal depositing member provided in the insulator that insulates the coil and the back yoke are set to the first stator and the second stator. In this case, the winding work can be performed in the same manner between the first stator and the second stator, and a connection error can be easily prevented.

  In the axial gap motor according to an embodiment, the first stator and the second stator have substantially the same shape except for the connection.

  According to the above embodiment, the first stator and the second stator have substantially the same shape except for the connection, so that the magnetic resistances of the two stators can be made substantially the same, and the two stators have substantially the same amount. Magnetic flux can be linked.

  Moreover, in the axial gap type motor of one embodiment, the neutral point side connection and the power source side connection of the coil are performed radially outward with respect to the teeth.

  According to the embodiment, the connection between the two stators is facilitated by performing the connection on the neutral point side of the coil and the connection on the power source side on the radially outer side with respect to the teeth.

In the axial gap type motor of one embodiment,
The connection on the neutral point side of the coil and the connection on the power source side are performed radially inward with respect to the teeth,
The lead-out to the power source side and the connection between the first stator and the second stator are made after passing through the back yoke and extending to the side opposite to the rotor with respect to the first and second stators. Connected.

  According to the embodiment, the neutral point side connection and the power source side connection of the coil are performed radially inward with respect to the teeth, and are drawn out to the power source side and between the first stator and the second stator. By connecting the wires once passing through the back yoke and coming out to the opposite side of the rotor with respect to the first and second stators, the length of the cross wire is shortened and the space can be used effectively.

  In the compressor according to the present invention, any one of the above axial gap motors is mounted.

  According to the compressor having the above configuration, the production process is simple, and by installing an axial gap type motor that can reduce defects such as a coil winding direction error and a coil end connection error, productivity can be improved and low A compressor capable of reducing costs can be realized.

  As apparent from the above, according to the axial gap type motor of the present invention, it is possible to realize an axial gap type motor capable of reducing defects such as a coil winding direction error and a coil end connection error in a simple production process. .

  Further, according to the axial gap type motor of one embodiment, one multi-pole magnetized magnet is provided in one layer in the axial direction, and both surfaces of the one magnet facing the same pole in the axial direction are mutually connected. By using the first magnetic pole surface and the second magnetic pole surface exhibiting different polarities, the amount of magnets can be reduced, productivity can be further improved, and substantially the same amount of magnetic flux can be linked to the two stators. it can.

  Further, according to the axial gap type motor of one embodiment, in a rotor in which a plurality of magnets arranged in the circumferential direction are provided in only one layer in the axial direction, both surfaces facing each other in the axial direction of the magnets have different polarities. By using the first magnetic pole surface and the second magnetic pole surface exhibiting the above, the amount of magnets can be reduced, productivity can be further improved, and substantially the same amount of magnetic flux can be linked to the two stators.

  In addition, according to the axial gap type motor of one embodiment, it is possible to more efficiently prevent demagnetization of the magnet by providing magnetic cores magnetically separated for each magnetic pole on both sides of the magnet of the rotor. Can do.

  Further, according to the axial gap type motor of one embodiment, the position of the neutral point side connection terminal and the power supply side connection terminal among the terminal deposit members provided in the insulator that insulates the coil and the back yoke, By providing the first stator and the second stator oppositely when viewed from the rotor side, the winding work can be performed in the same manner in the first stator and the second stator, and a mistake in connection can be easily prevented.

  Further, according to the axial gap type motor of one embodiment, substantially the same amount of magnetic flux can be linked to the two stators by making the first stator and the second stator substantially the same shape except for the connection. .

  Further, according to the axial gap type motor of one embodiment, the connection between the two stators can be easily performed by performing the connection on the neutral point side and the power supply side of the coil on the radially outer side with respect to the teeth. Can be done.

  Further, according to the axial gap type motor of one embodiment, the neutral point side connection and the power source side connection of the coil are performed radially inward with respect to the teeth, and are drawn out to the power source side and the first stator. By connecting the wire between the second stator and the first and second stators after passing through the back yoke and connecting them to the opposite side of the rotor, the length of the cross wire is shortened. Effective use of space.

  In addition, according to the compressor of the present invention, productivity can be improved by installing an axial gap type motor that can reduce defects such as a coil winding direction error and a coil end connection error in a simple production process. A compressor capable of reducing the cost can be realized.

  The axial gap type motor and compressor of the present invention will be described in detail below with reference to the illustrated embodiments.

[First Embodiment]
FIG. 1 shows a plan view of the first and second stators of the axial gap type motor according to the first embodiment of the present invention as viewed from the rotor side. The axial gap type motor according to the first embodiment includes a rotor 30 (shown in FIG. 2) fixed to a rotating shaft (not shown) and first and second axially opposite sides of the rotor 30 via air gaps. 1 stator 10 and 2nd stator 20 are provided. As shown in FIG. 1, the first stator 10 includes a disk-shaped back yoke 11, a tooth 12 erected on the rotor side of the back yoke 11, and a coil 13 wound around the tooth 12. Have. The second stator 20 includes a disk-shaped back yoke 21, teeth 22 standing on the rotor side of the back yoke 21, and a coil 23 wound around the teeth 22. FIG. 1 is a diagram in which the first stator 10 and the second stator 20 are developed with reference to a fold line (dashed line) between the first stator 10 and the second stator 20. In FIG. 1, the teeth T1 (U phase) of the first stator 10 and the teeth T2 (U phase) of the second stator 20 face each other, and the V phase is clockwise from T1 (U phase) of the first stator 10. , W phase,..., Teeth of each phase are opposed counterclockwise from T2 (U phase) of the second stator 20.

  The coil 13 of the first stator 10 and the coil 23 of the second stator 20 are concentrated windings from the side of the rotor 30 (shown in FIG. 2) sandwiched between the first and second stators 10 and 20 from both sides in the axial direction. The coil 13 of the first stator 10 is wound at the neutral point side (shown by 15 in FIG. 1), and the coil 23 of the second stator 20 is wound at the neutral point. Side (shown at 25 in FIG. 1).

  FIG. 2 is an exploded perspective view of the rotor 30 of the axial gap motor. The rotor 30 includes a field part 31 and a connecting part 35, and is rotatable about a rotation axis (not shown). In FIG. 2, the field part 31 and the connecting part 35 are shown shifted along the rotation axis. Actually, the rotor 30 is disposed in a state of being sandwiched between the first stator 10 and the second stator 20 shown in FIG.

  The field part 31 includes a magnet 32 and magnetic plates 33 and 34 as an example of a magnetic iron core. The magnet 32 has a first magnetic pole surface and a second magnetic pole surface that have different polarities on both sides in the axial direction. For example, the first magnetic pole surface exhibits an N pole, and the second magnetic pole surface exhibits an S pole.

  The magnet 32 is desirably a sintered rare earth magnet in order to increase the magnetic flux density. In this case, rare earth magnets, particularly sintered magnets, have high conductivity and are liable to cause eddy current loss. However, by using a magnetic material having lower conductivity than rare earth magnets for the magnetic plates 33 and 34 described later. The occurrence of eddy current loss can be suppressed.

  The magnetic plates 33 and 34 are provided on the first magnetic pole surface and the second magnetic pole surface of the magnet 32, respectively. At this time, the magnetic plates 33 and 34 are fixed to the magnet 32 using an adhesive or the like.

  By reducing the axial thickness of the magnetic plates 33 and 34 by an amount corresponding to the adhesive, an increase in the axial thickness of the field portion 31 can be avoided. However, since there is a risk that the magnetic properties may be reduced by the reduction in the thickness of the magnetic plates 33 and 34, it is desirable to employ an adhesive made of a magnetic material. By using an adhesive made of a magnetic material, it is possible to compensate for a decrease in magnetic properties due to a decrease in the thickness of the magnetic plates 33 and 34.

  By adopting magnetically isotropic powder magnetic cores for the magnetic plates 33 and 34, in particular, by adopting a dust core, eddy current loss can be less likely to occur in the magnetic plates 33 and 34.

  The field part 31 is annularly arranged along the circumferential direction around the rotation axis, and is separated from each other along the circumferential direction. At this time, with respect to the magnet 32, the magnet 32 is also arranged in a ring shape along the circumferential direction around the rotation axis.

  The magnets 32 adjacent to each other in the circumferential direction exhibit different polarities on both sides in the axial direction. That is, when one adjacent magnet 32 has the first magnetic pole surface facing one side in the axial direction, the other adjacent magnet 32 has the second magnetic pole surface facing one side in the same axial direction. . The same applies to the other side in the axial direction. However, the present invention is not limited to this.

  The connecting portion 35 is made of a non-magnetic material and connects the field portions 31 to each other. The nonmagnetic material of the connecting portion 35 may be a nonmetal such as a resin, or a metal such as aluminum or stainless steel. If a non-metal is used for the connecting portion 35, eddy current loss does not occur in the connecting portion 35. On the other hand, if a metal is employed for the connecting portion 35, the strength of the connecting portion 35 is increased.

  In the rotor, the magnetic poles appearing on both sides in the axial direction may be reversed. For this purpose, the minimum configuration is one magnet layer in the axial direction. The reason why the cores (magnetic plates) exist on both sides of the magnet is to reduce the eddy current inside the magnet. In particular, eddy current loss due to a change in magnetic flux of a carrier component in PWM control can be reduced.

  FIG. 3A shows a plan view of another rotor 130 that can be used in the axial gap type motor, and FIG. 3B shows a sectional view taken along line IIIB-IIIB in FIG. 3A.

  As shown in FIGS. 3A and 3B, the rotor 130 includes a core 131 that is provided radially outward from a cylindrical connecting portion 135 and a magnet 132 that is disposed in the circumferential direction between the cores 131. Have. In addition, the core 131 is also disposed at both ends of the magnet 132 in the axial direction. The core 131 is separated from a portion in contact with the magnet and a portion radially provided between the magnets by a slit 131a in order to prevent leakage of magnetic flux. By providing the core 131 between the magnets 132, the q-axis inductance is increased, and the reluctance torque generated in proportion to the difference between the q-axis inductance and the d-axis inductance is increased by advancing the current phase by a predetermined angle from the q-axis. Can be used.

  FIG. 4 is a perspective view of another rotor 230 that can be used in the axial gap motor.

  As shown in FIG. 4, the rotor 230 has a single magnet 232, and the magnet 232 is used by being multipolarly magnetized in the circumferential direction. In this case, the inner diameter of the magnet may be reduced and fitted directly to the rotating shaft (not shown), or may be fitted to the rotating shaft via a non-magnetic magnet holder (not shown).

  FIG. 5 is a perspective view of another rotor 330 that can be used in the axial gap motor.

  As shown in FIG. 5, the rotor 330 includes a back yoke 331 and a plurality of magnets 332 arranged in the circumferential direction on both axial sides of the back yoke 331. Although the magnets 332 are provided in two layers in the axial direction, the arrangement of magnetic poles is the same as that of the rotor 30 in FIG. By doing so, the thickness of the back yoke 331 can be reduced. The back yoke 331 is used for holding the magnet 332 and fitting a rotation shaft (not shown) in a circular hole 331a provided on the inner periphery. For example, the magnetic flux does not flow to the magnetic poles adjacent in the circumferential direction, but flows to the magnets facing in the axial direction.

  The first stator 10 faces one side of the rotor 30 (130, 230, 330) in the axial direction with a slight air gap (air gap) therebetween, and the axial direction of the rotor 30 (130, 230, 330). The second stator 20 faces the other side with a slight gap (air gap) therebetween.

  The first and second stators of the axial gap type motor according to the present invention are provided with a plurality of teeth made of a magnetic material arranged along the circumferential direction and spaced apart from each other from the disk-shaped back yoke around the rotation axis. It is a concentrated winding in which a coil is wound independently on each tooth.

  The relationship between the number of poles of the rotor of this axial gap motor and the number of teeth of the first and second stators is arbitrary as long as the rotor rotates by generating a rotating magnetic field, but three-phase winding is applied. 2n / 3n, 8n / 9n, 10n / 12n (n is a natural number), etc. are conceivable. In this first embodiment, the relationship between the number of poles of the rotor and the number of teeth of the first and second stators is 8 / 12.

  In this case, the teeth are wound in the order of U phase, V phase, W phase, U phase, V phase, W phase, U phase, V phase, W phase, U phase, V phase, and W phase. Each phase is normally star-connected or, in some cases, delta-connected, and its terminal is connected to an inverter output terminal that functions as a three-phase power source.

  In addition, the coil of the same phase in the same rotor may be connected in series, and may be connected in parallel.

  As shown in FIG. 6, when coils of the same phase are connected in parallel, one of the coils is directly connected to the power supply side and the other is connected to the neutral point side. That is, in FIG. 6, one end of the coils U1, U2, U3, U4 is connected to the power supply side, one end of the coils V1, V2, V3, V4 is connected to the power supply side, and one end of the coils W1, W2, W3, W4. Is connected to the power supply side, while the other ends of coils U1, U2, U3, U4, the other ends of coils V1, V2, V3, V4 and the other ends of coils W1, W2, W3, W4 are on the neutral point side. It is connected.

  On the other hand, as shown in FIG. 7, when coils of the same phase are connected in series, the start of winding of one coil is connected to the end of winding of another coil. That is, in FIG. 7, one end of the coils U1, U2, U3, U4 connected in series is connected to the power supply side, and one end of the coils V1, V2, V3, V4 connected in series is connected to the power supply side. One end of the connected coils W1, W2, W3, W4 is connected to the power supply side, while the other ends of the series connected coils U1, U2, U3, U4 are connected in series with the coils V1, V2, V3, V4. The other ends of the coils W1, W2, W3, W4 connected in series with the other end are connected on the neutral point side.

  In this description, the expressions “power supply side” and “neutral point side” are used depending on whether they are closer to the power supply side or the neutral point side.

  In connection with the first stator and the second stator of the axial gap type motor of the present invention, the same phase coils may be connected in series, or the same phase coils may be connected in parallel. In the case of parallel, the first stator and the second stator can be neutrally connected independently.

  Of the teeth of the first stator and the second stator, coils wound around teeth (for example, T1 and T2 in FIG. 1) facing the axial direction through the rotor are in the same direction as viewed from the rotor side. Each is the same phase wound. Since the magnetic poles of the rotors facing the respective coils are opposite to each other, it is necessary to flow currents in different directions with respect to the facing coils as viewed from the rotor side. In addition, both teeth may shift | deviate a little, for example, in order to reduce a cogging torque. Usually, the deviation angle is at most about half or less of the teeth pitch.

  At this time, the winding direction is not reversed with respect to the teeth, but the winding direction is the same as viewed from the rotor side, and in the connection, one stator is connected to the power supply side at the beginning of coil winding, In the stator, the winding end of the coil is connected to the power supply side.

  The “winding start” of the coil is literally the side where the winding is started, but in a state where the coil is completed, it is the portion that is most drawn from the teeth (winding core) side of the coil.

  Thereby, in the process before connection, ie, the state where the coil is mounted on the teeth, the two stators are in the same shape. Therefore, it may be manufactured without being conscious of which stator it is. Also, when winding directly on the teeth (for example, nozzle winding), the swirl direction of the nozzle is always the same, and when winding while rotating the teeth (for example, spindle winding), the teeth are always from the same direction. A bobbin or a coil wound tooth may be fitted into the yoke.

  As shown in FIG. 8, at the time of connection, the winding start and the winding end of the coil are deposited in a terminal deposit box or a connection terminal. In this step, the deposit positions in the two stators are different. For example, in FIG. 1, connection is provided on the inner peripheral side of the tooth 12, but FIG. 8 illustrates a case where connection is made on the outer peripheral side of the tooth 12. For example, it is a case where the connection terminal is erected on the connection board on which the pattern for short-circuiting the neutral point is deposited. That is, on the connection board, the power supply side connection terminal P1 and the neutral point side connection terminal P2 are provided in the same manner, but the coil end for depositing it is different in whether the winding starts or ends.

  In FIG. 1, the wires are connected on the inner peripheral side of the teeth 12. However, when the terminal is not pulled out to the outside, the neutral point is short when the teeth are closed on the inner peripheral side of the teeth. There is an advantage that the resistance value is also reduced. The terminal to be drawn out extends through the back yoke and is connected to the stator by being drawn out on the side opposite to the rotor.

  When connecting the coil ends of the two first and second stators, they must pass through at least the outer periphery of the rotor. Therefore, it is more suitable to connect on the outer peripheral side of the teeth, but since the peripheral length becomes longer toward the outer peripheral side of the teeth, it is desirable to arrange the teeth on the outer peripheral portion as much as possible. From this point of view, it is desirable to bring the connection to the inner circumference.

  FIG. 9 shows an iron core shape of a stator 110 that can be replaced with the stator. The stator core shape shown in FIG. 9 includes a back yoke 111, teeth 112 erected on the back yoke 111, and a wide core 113 disposed at the tip of the teeth 112.

  FIG. 10 is a plan view of the wide core 113 shown in FIG. As shown in FIG. 10, by providing the wide core 113, the air gap area increases, and more magnetic flux of the rotor can be linked to the stator. The wide core 113 needs to be separated so that adjacent wide cores 113 are not short-circuited. For example, the interval between adjacent wide cores is desirably more than twice the gap length between the rotor and the wide core.

  Moreover, FIG. 11 has shown another form of the wide core in FIG. As shown in FIG. 11, the wide core 213 can be handled as a single body by being connected by a thin portion 213 a on the outer periphery and the inner periphery. In this case, the accuracy of the air gap surface between the rotor and the wide core is also good.

  FIG. 12 is a developed cross-sectional view of a portion of the rotor 30 shown in FIG. 2 and the first and second stators 10 and 20 shown in FIG. 1 cut by a cylindrical surface including a magnet.

  As shown in FIG. 12, the magnetic circuit passes through a magnetic path that passes from the first stator 10 through the rotor 30 to the second stator 20. The first stator 10 and the second stator 20 have the same shape, the same number of turns and the same current, and the gap lengths of the two faces are substantially the same, so that substantially the same torque acts on the gaps of the two faces, and the thrust Power works. Since the thrust force generated by the magnetic force of the first stator 10 and the second stator 20 is opposite in the axial direction, they cancel each other and cancel each other.

  FIG. 13 is a cross-sectional view in which a portion of the rotor 130 shown in FIG. 3 and the first and second stators 10 and 20 shown in FIG. 1 cut by a cylindrical surface including a magnet is developed.

  FIG. 14 is a cross-sectional view in which a portion of the rotor 230 shown in FIG. 4 and the first and second stators 10 and 20 shown in FIG. 1 are cut by a cylindrical surface including a magnet.

  FIG. 15 is a developed cross-sectional view of the rotor 330 shown in FIG. 5 and the first and second stators 10 and 20 shown in FIG.

  According to the axial gap type motor of the first embodiment, it is possible to realize an axial gap type motor that can reduce defects such as a coil winding direction error and a coil end connection error in a simple production process.

  In addition, as shown in FIG. 4, one multi-pole magnetized magnet 232 is provided in only one layer in the axial direction, and both surfaces of the one magnet 232 facing the same pole in the axial direction have different polarities. By using the first magnetic pole surface and the second magnetic pole surface to be presented, the amount of magnets can be reduced, productivity can be further improved, and substantially the same amount of magnetic flux can be linked to the two stators.

  As shown in FIGS. 2, 3A, and 3B, in the rotor 30, 130 in which only one layer of the plurality of magnets 32, 132 arranged in the circumferential direction is provided in the axial direction, the axis of each magnet 32, 132 is By using both the first and second magnetic pole surfaces having different polarities as the two surfaces facing in the direction, the amount of magnets can be reduced, the productivity can be further improved, and the two stators have substantially the same amount. The magnetic flux can be interlinked.

  In addition, as shown in FIG. 2, by providing magnetic plates 33 and 34, which are magnetic cores magnetically separated for each magnetic pole, on both surfaces of the magnet 32 of the rotor 30, demagnetization of the magnet 32 is further improved. It can prevent efficiently.

  Further, the positions of the neutral point side connection terminals and the power supply side connection terminals among the terminal deposit members provided on the insulator that insulates the coil and the back yoke are viewed from the rotor side in the first stator and the second stator. By providing them in reverse, the winding work can be performed in the same manner in the first stator and the second stator, and a connection mistake can be easily prevented.

  Further, by making the first stator 10 and the second stator 20 have substantially the same shape except for the connection, substantially the same amount of magnetic flux can be linked to the two stators.

[Second Embodiment]
FIG. 16A is a longitudinal sectional view of a rotary compressor equipped with an axial gap type motor according to a second embodiment of the present invention. This rotary compressor is a high-pressure dome type. In addition, the axial gap type motor of 1st Embodiment is used for the rotary compressor of this 2nd Embodiment.

  As shown in FIG. 16A, the rotary compressor according to the second embodiment includes a sealed container 401, a compression mechanism unit 402 arranged in the sealed container 401, and the upper side of the compression mechanism unit 402 in the sealed container 401. And an axial gap type motor 403 that drives the compression mechanism unit 402 via the rotation shaft 404. A suction pipe 441 is connected to the lower side of the sealed container 401, while a discharge pipe 442 is connected to the upper side of the sealed container 401. The refrigerant gas supplied from the suction pipe 441 is guided to the suction side of the compression mechanism unit 402.

  The axial gap type motor 403 includes two upper first stators 410, a lower second stator 420, a part of the outer peripheral side of which is fixed inside the sealed container 401, and a rotating shaft 404 penetrating through the center. A rotor 430 is disposed between the first stator 410 and the second stator 420 in the axial direction, and is fitted and fixed to the rotary shaft 404. The lower end side of the rotating shaft 404 to which the rotor 430 is fixed is connected to the compression mechanism unit 2.

  The compression mechanism 402 includes a cylinder-shaped main body 440 and an upper end plate 408 and a lower end plate 409 attached to upper and lower open ends of the main body 440, respectively. The rotating shaft 404 passes through the upper end plate 408 and the lower end plate 409 and is inserted into the main body 440. The rotating shaft 404 is rotatably supported by a bearing 451 provided on the upper end plate 408 of the compression mechanism unit 402 and a bearing 452 provided on the lower end plate 409 of the compression mechanism unit 402. A crankpin 405 is provided on the rotary shaft 404 in the main body 440, and compression is performed by a compression chamber 407 formed between a piston 406 fitted and driven by the crankpin 405 and a corresponding cylinder. The piston 406 rotates in an eccentric state or revolves to change the volume of the compression chamber 407.

  In the rotary compressor configured as described above, when the compression mechanism unit 402 is driven by rotating the axial gap type motor 403, refrigerant gas is supplied from the suction pipe 441 to the compression mechanism unit 402, and the compression mechanism unit 402 compresses the refrigerant gas. To do. Thus, the high-pressure refrigerant gas compressed by the compression mechanism unit 402 is discharged into the sealed container 401 from the discharge port 423 of the compression mechanism unit 402, and a groove (not shown) provided around the rotation shaft 404, A hole (not shown) penetrating the inside of the first stator 410, the second stator 420 and the rotor 430 in the axial direction, between the outer periphery of the first stator 410, the second stator 420 and the rotor 430 and the inner surface of the sealed container 401 , And the like, and is discharged to the outside of the sealed container 401 through the discharge pipe 442.

  FIG. 16B is a schematic view for explaining a rotor structure using a holder of an axial gap type motor of the rotary compressor. In FIG. 16B, the right side is the rotating shaft side, and the left side is the rotor outer peripheral side. In the structure of the rotor 430 shown in FIG. 16B, a magnet 432 sandwiched between cores 431 and 431 as examples of magnetic cores is embedded in a holder 433 made of a non-magnetic material from both sides in the axial direction.

  FIG. 16C is a schematic view for explaining a rotor structure using a resin mold of an axial gap type motor of the rotary compressor. In FIG. 16C, the right side is the rotating shaft side, and the left side is the rotor outer peripheral side. In the structure of the rotor 440 shown in FIG. 16C, magnets 442 sandwiched between cores 441 and 441 as examples of magnetic cores from both sides in the axial direction are molded with a resin 443.

  In the rotary compressor of the second embodiment, the first stator 410 and the second stator 420 of the axial gap motor 403 may be provided with positioning means for alignment.

  For example, as shown in FIG. 17, notches 511a and 521a as examples of positioning means are provided on the back yokes 511 and 521 of the first and second stators, respectively, and the notches 511a and 521a are assembled so as to be aligned. It is. In FIG. 17, teeth and coils are omitted, and only the back yoke is shown. The notches 511a and 521a of the stator back yokes 511 and 521 are also used as passages for returning the refrigeration oil when mounted on the compressor. In FIG. 17, reference numerals 512 and 522 denote connection plates, which are actually provided with holes through which the teeth penetrate and vapor-deposited wiring patterns, but are omitted in the figure and only show the relationship with the back yoke. It has a notch at the same position as the back yoke and performs alignment.

  In addition, when changing the insulator of a coil and a core with two stators, a mark is required so as not to make a mistake.

  For example, as shown in FIG. 18, the back yokes 611 and 621 of the first and second stators have outer notches 611a and 621a and holes 611b and 621b near the outer periphery, and the notches 611a and 621a and the holes 611b and 611b, If an insulator corresponding to 621b is provided, there is no mistake. The notches 611a and 621a and the holes 611b and 621b are positioning means.

  According to the rotary compressor of the second embodiment, the productivity is improved by mounting the axial gap type motor 403 that can reduce defects such as a coil winding direction error and a coil end connection error in a simple production process. A compressor that can be improved and can be reduced in cost can be realized.

  In addition, the coils 413, 423 of the first stator 410 and the second stator 420 are connected to the neutral point side and the power source side radially inward with respect to the teeth 412, 422. In the connection between the first stator 410 and the second stator 420, the wirings L1 and L2 connected to the power sources of the coils 413 and 423 of the first stator 410 and the second stator 420 are temporarily connected to the back yokes 411 and 421. By passing through and connecting to the first and second stators 410 and 420 on the opposite side of the rotor 430, the length of the crossover line is shortened and the space can be used effectively.

  Although the rotary compressor has been described in the second embodiment, the present invention may be applied to a compressor having another configuration such as a scroll compressor.

[Third Embodiment]
FIG. 19 shows a plan view of the first and second stators of the axial gap motor according to the third embodiment of the present invention, as viewed from the rotor side. The axial gap type motor according to the third embodiment includes a rotor (shown in FIG. 2) fixed to a rotating shaft (not shown), and a first stator that faces both axial sides of the rotor via an air gap. 710 and a second stator 720. As shown in FIG. 19, the first stator 710 includes a disk-shaped back yoke 711, a tooth 712 standing on the rotor side of the back yoke 711, and a coil 713 wound around the tooth 712. Have. In FIG. 19, the coil 713 is shown with its thickness omitted, and matches the outline of the tooth 712. The second stator 720 includes a disk-shaped back yoke 721, a tooth 722 standing on the rotor side of the back yoke 721, and a coil 723 wound around the tooth 722.

  The first and second stators 710 and 720 of the axial gap type motor according to the third embodiment have power supply side connection patterns 714 and 724 and neutral point connection patterns 715 and 725 on the outer peripheral side of the teeth 712 and 722. Power source side terminals U, V, W and neutral point side terminals N are erected on the deposited connection plates 716, 726. The power supply side terminals U, V, and W are led to a three-phase power supply by combining the first stator and the second stator. Further, the neutral point side terminal N is connected between the first stator and the second stator, and extracts a neutral point signal as necessary. Thereby, the coils of the same phase are connected in series inside each of the first stator and the second stator, and the first stator and the second stator have a parallel coil configuration. Note that the connection between the first stator and the second stator of the neutral point terminal N is not essential.

  The coil 713 of the first stator 710 and the coil 723 of the second stator 720 are concentrated windings, as viewed from the rotor (not shown) side sandwiched between the first and second stators 710 and 720 from both sides in the axial direction. The first stator 710 coil is wound in the same direction, the winding start of the coil of the first stator 710 is the neutral point side (shown by 715 in FIG. 19), and the winding end of the coil 723 of the second stator 720 is the neutral point side (see FIG. 19 725).

  The axial gap type motor of the third embodiment has the same effect as the axial gap type motor of the first embodiment.

  In addition, by connecting the coils 713 and 723 on the neutral point side and the power source side on the radially outer side with respect to the teeth 712 and 722, the connection between the two stators can be easily performed.

  Although specific embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the present invention.

FIG. 1 is a plan view of the first and second stators of the axial gap motor according to the first embodiment of the present invention as viewed from the rotor side. FIG. 2 is an exploded perspective view of the rotor of the axial gap motor. FIG. 3A shows a plan view of another rotor of the axial gap type motor. 3B is a cross-sectional view taken along line IIIB-IIIB in FIG. 3A. FIG. 4 shows a perspective view of another rotor of the axial gap type motor. FIG. 5 shows a perspective view of another rotor of the axial gap type motor. FIG. 6 is a diagram in which coils of the same phase are connected in parallel. FIG. 7 is a diagram in which coils of the same phase are connected in series. FIG. 8 is a diagram for explaining the start and end of winding of the coil at the time of connection. FIG. 9 is a view showing the iron core shape of a stator that can be replaced with the stator. FIG. 10 is a plan view of the wide core shown in FIG. FIG. 11 is a diagram showing another embodiment of the wide core shown in FIG. FIG. 12 is a developed cross-sectional view of a portion obtained by cutting the rotor and stator shown in FIG. 2 with a cylindrical surface including a magnet. FIG. 13 is a developed cross-sectional view of a portion of the rotor and stator shown in FIG. 3 cut by a cylindrical surface including a magnet. FIG. 14 is a developed cross-sectional view of a portion of the rotor and stator shown in FIG. 4 cut by a cylindrical surface including a magnet. FIG. 15 is a developed cross-sectional view of a portion of the rotor and stator shown in FIG. 5 cut by a cylindrical surface including a magnet. FIG. 16A is a longitudinal sectional view of a rotary compressor equipped with the axial gap type motor. FIG. 16B is a schematic view for explaining a rotor structure using a holder of an axial gap type motor of the rotary compressor. FIG. 16C is a schematic diagram for explaining a rotor structure using a resin mold of an axial gap type motor of the rotary compressor. FIG. 17 is a perspective view for explaining the alignment by the notch of the rotor of the axial gap type motor. FIG. 18 is a perspective view for explaining the alignment of the notch and the hole of the rotor of the axial gap motor. FIG. 19 is a plan view of the first and second stators of the axial gap motor according to the third embodiment of the present invention as viewed from the rotor side.

DESCRIPTION OF SYMBOLS 10,710 ... 1st stator 11,711 ... Back yoke 12,712 ... Teeth 13,713 ... Coil 20,720 ... 2nd stator 21,721 ... Back yoke 22,722 ... Teeth 23,723 ... Coil 30 ... Rotor 31 ... Field part 35 ... Connecting part 32 ... Magnet 33,34 ... Magnetic plate 110 ... Stator 111 ... Back yoke 112 ... Teeth 113 ... Wide core 130 ... Rotor 131 ... Core 132 ... Magnet 135 ... Connecting part 230 ... Rotor 231 ... Wide core 231a ... Thin portion 232 ... Magnet 330 ... Rotor 331 ... Back yoke 332 ... Magnet 331a ... Circular hole 401 ... Sealed container 402 ... Compression mechanism 403 ... Axial gap type motor 404 ... Rotating shaft 405 ... Crank pin 406 ... Piston 407 ... compression chamber 410 ... first stator 411 ... back Yoke 412 ... Teeth 413 ... Coil 420 ... Second stator 421 ... Back yoke 422 ... Teeth 423 ... Coil 430 ... Rotor 408 ... Upper end plate 409 ... Lower end plate 440 ... Main body 441 ... Suction pipe 442 ... Discharge pipe 451, 452 ... Bearing 716, 726 ... Connection plate U1, U2, U3, U4, V1, V2, V3, V4, W1, W2, W3, W4 ... Coil L1, L2 ... Wiring

Claims (9)

A rotor (30, 130, 230, 330, 430) fixed to the rotating shaft and a first stator (opposite facing each other via air gaps on both axial sides of the rotor (30, 130, 230, 330, 430)) 10, 410, 710) and a second stator (20, 420, 720),
The first and second stators (10, 410, 710, 20, 420, 720) include a back yoke (11, 21, 711, 721) and the rotor of the back yoke (11, 21, 711, 721). The teeth (12, 22, 712, 722) provided in the axial direction on the (30, 130, 230, 330, 430) side and the coil (13, 13) wound around the teeth (12, 22, 712, 722) , 23, 713, 723),
The coils (13, 713) of the first stator (10, 410, 710) and the coils (23, 723) of the second stator (20, 420, 720) are concentrated windings, and the rotor ( 30, 130, 230, 330, 430) and wound in the same direction,
In the coil (13, 713) of the first stator (10, 410, 710), the winding start of the coil (13, 713) most drawn out from the teeth (12, 22, 712, 722) side The portion is on the neutral point side, and the coil (23,723) of the second stator (20,420,720) is pulled out from the side farthest from the teeth (12,22,712,722). An axial gap type motor characterized in that the winding end portion of the coil (23, 723) is on the neutral point side. The axial gap type motor according to claim 1,
The rotor (230) is provided with only one layer of one magnet (232) magnetized in multiple poles in the axial direction,
An axial gap type motor characterized in that both surfaces of the one magnet (232) facing in the axial direction of the same pole are a first magnetic pole surface and a second magnetic pole surface having different polarities. The axial gap type motor according to claim 1,
The rotor (30, 130) includes a plurality of magnets (32, 132) arranged in the circumferential direction in a single layer in the axial direction,
An axial gap type motor characterized in that both surfaces of the magnets (32, 132) facing in the axial direction are a first magnetic pole surface and a second magnetic pole surface having different polarities. In the axial gap type motor according to claim 2 or 3,
An axial gap type motor characterized in that magnetic cores (33, 34, 431, 441) magnetically separated for each magnetic pole are provided on both surfaces of the magnet (32, 432, 442). The axial gap type motor according to any one of claims 1 to 4,
A neutral point side connection terminal and a power source side connection among terminal deposit members provided on an insulator for insulating the coil (13, 23, 713, 723) and the back yoke (11, 21, 711, 721). pin is disposed in the side opposite to the rotor (30,130,230,330,430) of said first stator (10,410,710) in the circumferential direction, the second stator (20,420 , 720) is disposed circumferentially on the rotor (30, 130, 230, 330, 430),
The order of arrangement of the neutral point side connection terminals and the power supply side connection terminals of the first stator (10, 410, 710) in the circumferential direction as viewed from the rotor (30, 130, 230, 330, 430) side is as follows : The second stator (20, 420, 720) viewed from the rotor (30, 130, 230, 330, 430) side is opposite to the circumferential arrangement order of the neutral point side connection terminals and the power source side connection terminals of the second stator (20, 420, 720). axial gap motor, characterized in that it. The axial gap type motor according to any one of claims 1 to 5,
The axial gap type motor, wherein the first stator (10, 410, 710) and the second stator (20, 420, 720) have substantially the same shape except for connection. In the axial gap type motor according to any one of claims 1 to 6,
The neutral point side connection and the power supply side connection of the coils (13, 23, 713, 723) are performed radially outward with respect to the teeth (12, 22, 712, 722). Axial gap type motor. In the axial gap type motor according to any one of claims 1 to 6,
The neutral point side connection and the power source side connection of the coil (413, 423) are performed radially inward with respect to the teeth (412, 422),
The lead-out to the power source side and the connection between the first stator (410) and the second stator (420) pass through the back yoke once with respect to the first and second stators (410, 420). The axial gap type motor is characterized in that it is connected after being taken out on the opposite side of the rotor (430).   A compressor equipped with the axial gap motor (403) according to any one of claims 1 to 8.

Images