JP2010226902A - Motor stator and divided stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively cool a motor stator, concerning the motor stator, which is made by arranging a plurality of divided stators circumferentially, and the divided stators. <P>SOLUTION: A plurality of divided stators 20 are arranged circumferentially so as to constitute a motor stator. Each divided stator 20 includes a peripheral split core 3a on its peripheral side, a teeth part 3b which extends toward its center from the peripheral split core, and a coils 2 wound on the teeth part. When the inner perimetrical length, the width on the inner perimetrical side of the coil 2, is Lin, the peripheral length, the peripheral length of the peripheral split core, is Lout, the inner perimetrical radius, the radius on the inner perimetrical side of the coil, is Rin, and the peripheral radius, the radius of the peripheral split core, is Rout, Lin/Rin<Lout/Rout is met. When a plurality of divided stators are arranged circumferentially, a wedge-shaped space, which widens from inside to outside, is provided between the divided stators, and a heat conductive fin 5 constituted of a metallic material is arranged in this space. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a motor stator and a divided stator formed by arranging a plurality of divided stators circumferentially.

  Conventionally, various types of motors have been widely used. However, particularly in a high-power motor, an increase in coil temperature due to heat generated by copper loss accompanying an increase in current amount becomes a problem in a high load and low rotation range. For example, the upper limit of the operating temperature exists in the motor due to the heat resistant temperature of the enamel used as the insulating coating material of the coil, and the operating temperature must be lower than that. Therefore, the drive control range of the motor is limited so that the operating temperature is equal to or lower than the upper limit temperature, or the motor is enlarged to suppress the increase in operating temperature. However, with such a technique, it is difficult to obtain a small and high output motor.

  For this reason, a means for suppressing the temperature rise by providing a cooling mechanism is also employed. Patent Document 1 has a stator support member that holds both axial end portions of a split stator. The stator support member is made of a good heat conductive material to promote heat dissipation, and a cooling flow is generated in the stator support member. It is shown that a path is provided.

  Patent Document 2 discloses a configuration in which a flow path through which oil flows is provided inside the stator to cool the stator.

  Patent Document 3 discloses a configuration in which a cooling passage is formed in a slot in which a stator coil is disposed.

JP 2001-359256 A JP 2004-320974 A JP 2002-186205 A

  However, in Patent Document 1, it is difficult to cool the central portion of the core and the coil of that portion. Also in Patent Document 2, it is difficult to effectively cool the entire stator, and it is difficult to effectively cool the entire coil. Moreover, in patent document 3, there existed a problem that it was difficult to circulate the oil which is a refrigerant | coolant uniformly, and it was difficult to cool effectively as a whole.

  The present invention is a motor stator formed by arranging a plurality of divided stators in a circumferential shape, and each divided stator includes a peripheral divided core portion on the outer peripheral side, and a teeth portion extending in the center direction from the peripheral divided core portion. , Including a coil wound around the tooth portion, and an inner peripheral length Lin that is a width on the inner peripheral side of the coil, an outer peripheral length Lout that is an outer peripheral length of the peripheral divided core portion, and a radius on the inner peripheral side of the coil When a certain inner peripheral radius Rin and an outer peripheral radius Rout that is a radius of the peripheral divided core portion are satisfied, Lin / Rin <Lout / Rout is satisfied, and when a plurality of divided stators are arranged in a circumferential shape, A wedge-shaped space extending from the inside toward the outside is provided in the space, and heat conduction fins made of a metal material are disposed in this space.

  Further, it is preferable that the heat conducting fin is formed by extending a part of a peripheral divided core portion of the divided stator.

  Further, it is preferable that the coil is wound with a plate-shaped flat conductive wire so that the inner side thereof is in contact with the teeth portion, and the outer side portion of the flat conductive wire is in contact with the heat conductive fin.

  In addition, it is preferable to arrange a plurality of divided stators including the heat conductive fins in a circumferential shape and to shrink them with a fastening ring from the outer peripheral side.

  In addition, it is preferable that a case is disposed outside the fastening ring, and a cooling path for circulating a cooling medium is provided between the case and the shrink fitting ring.

  Further, a split stator for forming a motor stator by arranging a plurality of circumferences, a peripheral split core part, a tooth part extending in the center direction from the peripheral split core part, and wound around the tooth part An inner peripheral length Lin that is an inner peripheral side width of the coil, an outer peripheral length Lout that is an outer peripheral length of a peripheral divided core portion, an inner peripheral radius Rin that is an inner peripheral side radius of the coil, It is preferable that Lin / Rin <Lout / Rout is satisfied when the outer peripheral radius Rout, which is the radius of the divided core portion, is used.

  Further, a wedge-shaped heat transfer fin portion extending in the center direction is provided on one end side or both end sides in the circumferential direction, and when the length of the heat transfer fin portion is added to the inner peripheral length Lin and the outer peripheral length Lout, Lin / It is preferable that Rin = Lout / Rout.

  According to the present invention, the heat transfer fin formed from the heat good conductor is brought into contact with the coil, whereby the coil can effectively dissipate heat through the heat transfer fin.

It is a figure which shows the structure of the division | segmentation core part 3 and the heat-transfer fin part 5. FIG. It is a figure which shows the structure of the division | segmentation stator 20 which wound the coil 2 around the division | segmentation core part 3. FIG. It is a figure which shows the top view of the insulator 4. FIG. It is a figure showing the state where a plurality of division stators 20 are arranged. It is a figure which shows the other structure of the division | segmentation core 3 and the heat-transfer fin part 5. FIG. It is a figure which shows the further another structure of the division | segmentation core 3 and the heat-transfer fin part 5. FIG. FIG. 2 is a diagram illustrating a configuration of a fastening ring 1. It is a figure which shows the state which carried out the shrink fit of the some division | segmentation stator 20 in the fastening ring 1. FIG. FIG. 2 is a view showing a state in which a coolant channel 12 is formed between a fastening ring 1 and a case 10. It is a figure which shows the state which sealed the refrigerant flow path 12 with O ring.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view of the split core portion 3 and the heat transfer fin portion 5 of the split stator as viewed from the axial direction. The divided core portion 3 includes a peripheral divided core portion 3a disposed on the outer circumference and a tooth portion 3b extending inward from the central portion of the peripheral divided core portion 3a. A wedge-shaped heat transfer fin portion 5 extending inward is formed at both end portions of the peripheral divided core portion 3a.

  In the present embodiment, the peripherally divided core portion 3a is a portion having a constant thickness in the radial direction, and does not include the wedge-shaped heat transfer fin portion 5 positioned on the side portion. That is, the peripheral divided core portion 3a is connected to the adjacent peripheral divided core portion 3a via the heat transfer fin portion 5, and a donut-shaped stator core is formed by arranging a predetermined number of divided core portions 3 in a circumferential shape. Is done. In this example, since the heat transfer fin portions 5 are provided on both sides of the peripheral divided core portion 3a, the heat transfer fin portions 5 of two adjacent divided stators are combined to function as one heat transfer fin portion 5. It will be. In addition, the division | segmentation core part 3 is formed by laminating | stacking an electromagnetic steel plate as a whole.

  As shown in FIG. 2, the coil 2 is wound around the teeth portion 3 b of the split core portion 3 via the insulator 4 shown in FIG. 3, thereby forming the split stator 20. In FIG. 2, the insulator 4 is omitted. The coil 2 is a thin plate-like copper flat conductive wire, and is a coil extending in the radial direction formed by winding it around the teeth portion 3b a plurality of times. In this example, the end surface (inner peripheral side end surface) on the center side in the radial direction of the coil 2 forms substantially the same surface as the end surface (inner peripheral side end surface) on the center side of the tooth portion 3b. The tooth portion 3b has a trapezoidal shape in which the cross-sectional area decreases toward the inside, and the tooth portion 3b has a prismatic shape from the periphery of the stator toward the center, and the coil 2 is interposed around the teeth portion 3b via an insulator 4. Is wound.

  Since the coil 2 is a single winding of a flat conductive wire and its width itself is constant, the outer end of the coil 2 gradually tapers toward the center side as in the outer periphery of the tooth portion 3b. In this example, the end surface on the stator center side of the coil 2 and the end surface of the tooth portion 3b are substantially the same surface, but it is not always necessary to form the same surface. However, in order to accommodate the coil 2 as efficiently as possible, it is preferable that the surface on the center side of the coil 2 and the surface on the center side of the tooth portion 3b are substantially the same surface.

  The heat transfer fin portion 5 extends to the inner peripheral side surface of the coil 2 and may have a certain size on the inner peripheral side. However, the heat transfer fin portion 5 accommodates as much of the coil 2 as possible and generates unnecessary magnetic flux leakage. In order to prevent this, it is better that the outer circumference in the circumferential direction of the coil 2 is in direct contact with the adjacent coil 2 in a certain portion on the inner side in the radial direction.

  In the split stator 20 of the present embodiment, the inner peripheral length, which is the width on the inner peripheral side (center side) of the coil 2 is Lin, and the outer periphery is the width on the outer peripheral side of the peripheral split core portion 3a excluding the heat transfer fin portion 5. When the length is Lout, the inner peripheral radius that is the radius on the inner peripheral side of the coil 2 is Rin, and the outer peripheral radius that is the radius of the peripheral divided core portion 3a is Rout, Lin / Rin <Lout / Rout is satisfied. On the other hand, when the outer peripheral length of the peripheral divided core portion 3a including the heat transfer fin portion 5 is the outer peripheral length Lout, Lin / Rin = Lout / Rout. Therefore, a donut-shaped motor stator can be obtained by arranging the divided stators including the heat transfer fin portions 5 in a circumferential shape.

  Here, as described above, the synthetic resin insulator 4 is disposed between the periphery of the tooth portion 3 b and the inner peripheral side of the coil 2. FIG. 3 shows a plan view of the insulator 4, and FIG. 4 also shows a part of the insulator 4 as viewed from the inside. The insulator 4 includes a portion 4a that covers the side surface of the tooth portion 3b, portions 4c and 4d that are disposed on part of the upper and lower portions of the tooth portion 3b, and a portion 4b that is along the inner peripheral surface of the peripheral divided core portion 3a. Thus, the coil 2 is isolated from the tooth portion 3b and the peripheral divided core portion 3a. Furthermore, a part of the insulator 4 is arranged on the upper part of the coil 2, and this constitutes a part 4 e that supports a connection wiring with a peripheral circuit of the coil 2. Further, the tip end portion of the tooth-side portion 4 a of the insulator 4 has a brim that slightly expands in the circumferential direction, and holds the inner peripheral side end face of the coil 2.

  FIG. 4 shows a state in which three divided stators 20 are arranged circumferentially. One divided stator 20 describes the divided core portion 3, the coil 2, and the insulator 4, and one divided stator 20 is a divided core. The part 3 and the insulator 4 are described, and the other split stator describes only the split core part 3.

  FIG. 5 shows another configuration example of the divided stator 20. In this example, the heat transfer fin portion 5 is disposed only on one end side of the peripheral divided core portion 3a. Even if such a split stator 20 is used, it can be arranged circumferentially in the same manner as described above to form a motor stator. Note that the configuration of FIG. 5 has an advantage that it is easier to manufacture than the configuration of FIG. However, the condition at the interface can be relaxed in that the magnetic path in the split core 3 becomes a thermally symmetric boundary with respect to the tooth portion 3b, and the configuration of FIG. 1 is preferable.

  In the example of FIG. 6, the heat transfer fin portion 5 is formed of a separate member from the split stator. In this case, it is preferable that the heat transfer fin portion 5 be formed of a magnetic material such as aluminum or copper, thereby preventing magnetic flux from leaking to the heat transfer fin portion 5. In addition, you may arrange | position the heat-transfer fin part 5 on both sides of the division | segmentation core part 3 like FIG.

  When forming a motor stator, first, the insulator 4 is arranged on the divided core portion 3 of the divided stator 20. Next, the coil 2 is fitted into the insulator 4. Then, the divided stators 20 formed in this way are arranged on the circumference and are shrink-fitted in the fastening ring. That is, the circumferentially arranged divided stators are accommodated in the heated fastening ring 1 and tightened at a reduced temperature. FIG. 7 shows a configuration example of the fastening ring 1, and FIG. 8 shows a state in which a plurality of divided stators are shrink-fitted.

  9 and 10 show a configuration in which the refrigerant flow path 12 is directly formed outside the fastening ring 1. That is, the motor stator housed in the fastening ring 1 is housed in the case 10. A coolant channel 12 is formed between the case 10 and the fastening ring 1. The refrigerant flow path 12 can be a spiral flow path or a plurality of parallel flow paths by means of ridges or partition ridges provided on the surface of the case 10 or the fastening ring 1. In this example, the upper and lower sides of the refrigerant flow path 12 are sealed by the O-ring 14. Such a seal by the O-ring 14 can easily seal the refrigerant flow path 12. The case 10 may be provided with an inflow pipe and an outflow pipe for the refrigerant so that the refrigerant flows through the refrigerant flow path 12. In addition, various liquids can be used as the refrigerant, but oil such as water and ATF is preferable.

  Thus, in the motor stator according to the present embodiment, the outer periphery of the coil 2 in one divided stator 20 is in direct contact with the heat transfer fin 5. For this reason, the heat generated in the coil 2 is easily transmitted to the heat transfer fins. The heat transfer fins 5 are also present between the split core portions 3 and have a wedge shape extending to the fastening ring 1. Therefore, the heat generated in the coil 2 is easily transmitted to the fastening ring 1 through the heat transfer fins 5. And since the refrigerant | coolant has distribute | circulated the outer side of the fastening ring 1, heat can be effectively dissipated to the refrigerant | coolant. Therefore, even if the amount of heat generated by the coil 2 is large, the temperature rise can be suppressed and a high output motor can be obtained. In addition, the heat transfer fin 5 has a wedge shape, and the volume of the portion that transfers more heat of the coil 2 is larger, so that effective heat transfer is achieved.

  DESCRIPTION OF SYMBOLS 1 Fastening ring, 2 coils, 3 division | segmentation core part, 3a peripheral division | segmentation core part, 3b teeth part, 4 insulator, 5 heat-transfer fin part, 10 case, 12 refrigerant | coolant flow path, 14 O ring, 20 division | segmentation stator.

Claims (7)

A motor stator formed by arranging a plurality of divided stators circumferentially,
Each split stator
Including a peripheral divided core portion on the outer peripheral side, a teeth portion extending in the center direction from the peripheral divided core portion, and a coil wound around the teeth portion;
The inner peripheral length Lin that is the width of the inner peripheral side of the coil, the outer peripheral length Lout that is the outer peripheral length of the peripheral divided core portion, the inner peripheral radius Rin that is the inner peripheral side radius of the coil, and the radius of the peripheral split core portion When the outer peripheral radius is Rout, the wedge-shaped space that satisfies Lin / Rin <Lout / Rout and that has a plurality of divided stators arranged in a circumferential shape extends from the inside toward the outside between the divided stators. Provided,
A motor stator characterized in that heat conductive fins made of a metal material are arranged in this space. The motor stator according to claim 1,
The heat conductive fin is formed by extending a part of a peripheral divided core portion of the divided stator. The motor stator according to claim 1 or 2,
The coil is formed by winding a plate-shaped flat conductive wire so that the inside thereof is in contact with the teeth portion, and the outer side portion of the flat conductive wire is in contact with the heat conductive fin.   The motor stator according to claim 1, wherein a plurality of divided stators are arranged in a circumferential shape including heat conducting fins, and these are fitted by a fastening ring from the outer peripheral side. Stator.   5. The motor stator according to claim 4, wherein a case is disposed outside the fastening ring, and a cooling path for circulating a cooling medium is provided between the case and the shrink-fitting ring. Stator. A split stator for forming a motor stator by arranging a plurality of circumferences,
Including a peripheral split core part, a teeth part extending in the center direction from the peripheral split core part, and a coil wound around the tooth part;
The inner peripheral length Lin that is the width of the inner peripheral side of the coil, the outer peripheral length Lout that is the outer peripheral length of the peripheral divided core portion, the inner peripheral radius Rin that is the inner peripheral side radius of the coil, and the radius of the peripheral split core portion A split stator characterized by satisfying Lin / Rin <Lout / Rout when the outer peripheral radius is Rout. The split stator according to claim 6,
When a wedge-shaped heat transfer fin portion extending in the center direction is provided at one end side or both end sides in the circumferential direction, and the length of the heat transfer fin portion is added to the inner peripheral length Lin and the outer peripheral length Lout, Lin / Rin = A split stator having Lout / Rout.

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