JP2007135330A - Stator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a stator in which difference in magnetic characteristics between a flanged tooth and a flangeless tooth can be reduced. <P>SOLUTION: A flanged split core 5A and a flangeless split core 5B are arranged alternately, and the width Wa of the flanged split core 5A along the circumferential direction B of the motor is set smaller than the width Wb of the flangeless split core 5B along the circumferential direction B of the motor. Overhang dimension D1 of the flange 13 of the flanged split core 5A is set in the range of approximately 1.8-2.4 mm and increase/decrease in width Wa, Wb of the split core 5A, 5B from a reference width Wr is set in a range of approximately 4.4-5.5%. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a stator.

  A flange portion may be formed at the tip of each tooth portion of the stator core in order to improve the use efficiency of magnetism and improve the stability of the rotational operation of the rotor.

  However, the brim portion may interfere with the installation of the coil, etc., and an attempt to omit the brim portion may be made. However, there is a mixture of the tooth portion with the brim portion and the tooth portion without the brim portion. When arranged, various problems occur due to a difference in magnetic characteristics of the tooth portion depending on the presence or absence of the brim portion. For example, when a motor driven by a three-phase alternating current is connected in parallel to a coil that is supplied with the same phase current, between a coil sheathed on a toothed portion with a brim and a coil sheathed on a toothed portion without a brim There is a problem in that an induced voltage difference is generated, which causes a braking current between the coils and reduces the torque.

  Therefore, the problem to be solved by the present invention is to provide a stator that can reduce the magnetic characteristic difference between the bristle teeth portion and the bristle teeth portion.

  In order to solve the above-described problem, the invention of claim 1 includes a stator core in which a bristle tooth portion and a bristleless tooth portion are arranged in a mixed manner, and the width of the bristle tooth portion along the circumferential direction of the motor. The width of the teeth portion without brim is set smaller than the width along the motor circumferential direction.

  According to a second aspect of the present invention, in the stator according to the first aspect of the present invention, the width of the bristle tooth portion is about 4.4% or more than the reference width with respect to a predetermined reference width. The width of the bristleless teeth portion is set to be smaller than 5.5%, and the width of the bristleless teeth portion is about 4.4% or more and about 5.5% or less than the reference width based on the reference width. It is set large.

  According to a third aspect of the present invention, in the stator according to the first or second aspect of the present invention, the overhang dimension that the brim portion of the bristle tooth portion projects from the outer circumferential surface of the tooth in the circumferential direction of the motor is about 1.8 mm or more. , About 2.4 mm or less.

  According to a fourth aspect of the present invention, in the stator according to any one of the first to third aspects of the present invention, the stator core has a substantially cylindrical shaft portion extending along the motor radial direction and the shaft portion. A split core with a flange having a flange formed at an inner end in the radial direction of the motor, a substantially cylindrical shaft extending along the radial direction of the motor, and an outer side of the motor in the radial direction of the shaft A flange-less divided core having a yoke forming portion extending along the motor circumferential direction from the side end portion, and the flange-attached teeth portion is configured by the shaft portion and the flange portion of the flanged divided core. The shaft portion of the split core without the flange forms the teeth portion without the flange, the split core with the flange and the split core without the flange, and the yoke forming portion of the split core without the flange is the split core with the flange. Before As connected to the magnetic circuit to said motor radially outward end of the shaft portion are arranged alternately in an annular shape.

  According to the first aspect of the present invention, the width along the motor circumferential direction of the bristle tooth portion is set to be smaller than the width along the motor circumferential direction of the bristleless tooth portion. Can reduce the difference in magnetic characteristics between the coil portion and the tooth portion without brim, and as a result, for example, reduce the induced voltage difference between the coil sheathed on the tooth portion with brim and the coil sheathed on the tooth portion without brim. Even if these coils are connected in parallel, torque loss or the like can be prevented.

  According to the second aspect of the present invention, the width of the teeth portion with brim and the width of the teeth portion without brim are within a range of about 4.5% or more and about 5.9% or less based on a predetermined reference width. By increasing or decreasing the magnetic characteristic difference between the bristle teeth portion and the bristle teeth portion can be suppressed within a predetermined allowable reference range. Thereby, for example, the induced voltage difference between the coil sheathed on the bristle tooth portion and the coil sheathed on the bristle teeth portion can be suppressed to about 1% or less. In the stator, there are some variations in inductance, resistance and the like between the coils due to various factors such as coil line length error, and an induced voltage difference of about 1% does not matter.

  According to the third aspect of the present invention, the overhang dimension in which the brim portion of the bristle tooth portion projects from the tooth outer circumferential surface in the circumferential direction of the motor is set in a range of about 1.8 mm or more and about 2.4 mm or less. Therefore, the magnetic characteristic difference between the tooth portion with brim and the tooth portion without brim can be suppressed within a predetermined allowable reference range. Thereby, for example, the induced voltage difference between the coil sheathed on the bristle tooth portion and the coil sheathed on the bristle teeth portion can be suppressed to about 1% or less.

  According to the fourth aspect of the present invention, since the split core with the flange has no overhanging portion on the outer side in the motor radial direction (yoke side) of the shaft portion, the shaft portion is coiled from the outer side in the motor radial direction. The coil can be mounted by inserting it into the shaft, and the split core without flange has no overhanging portion (head portion) on the inner side in the motor radial direction of the shaft portion. The coil can be mounted by inserting it into the coil from the side, and the coil can be easily mounted on the split core.

  In addition, the split core with the flange and the split core without the flange are formed in an annular shape so that the yoke forming portion of the split core without the flange is connected in a magnetic circuit manner to the end portion on the outer side in the motor radial direction of the shaft portion of the split core with the flange. Since they are arranged alternately, it is possible to provide a stator that can be easily assembled while maintaining the magnetic performance of the stator core.

  1 is a perspective view of a stator according to an embodiment of the present invention, FIG. 2 is a sectional view showing a partial configuration of the stator of FIG. 1, and FIG. 3 is an exploded perspective view of the stator of FIG. 4 is a cross-sectional view of a split core with a brim and FIG. 5 is a cross-sectional view of a split core without a brim.

  As shown in FIGS. 1 to 3, the stator 1 includes a plurality of two types of divided stators 3A and 3B arranged in an annular shape on the outer periphery of the rotor, and the divided stators 3A and 3B are alternately arranged in nine pieces. Arranged and configured. The split stator 3A is configured to include a split core 5A with a brim and a coil 7A. The split stator 3B includes a brimless split core 5B and a coil 7B. The nine divided cores 5 </ b> A and 5 </ b> B arranged in a ring form a stator core 9.

  As shown in FIG. 4, the flanged split core 5 </ b> A includes a shaft portion (tooth portion) 11 having a substantially rectangular cross section extending along the motor radial direction A, and a motor radial direction A of the shaft portion 11. And a flange portion 13 formed on the inner side end portion, and no overhanging portion is provided on the outer side (yoke side) in the motor radial direction A of the shaft portion 11.

  As shown in FIG. 5, the flange-free split core 5 </ b> B includes a shaft portion (tooth portion) 15 having a substantially rectangular cross section extending along the motor radial direction A, and a motor radial direction A of the shaft portion 15. A yoke forming portion 17 extending along the motor circumferential direction B from the outer side end portion, and a projecting portion such as a flange portion on the inner side end portion of the shaft portion 15 in the motor radial direction A Is not provided.

  The yoke forming portion 17 of the split core 5B without collar forms the yoke of the adjacent split core 5B without flange via the core 5A with flange when the split cores 5A and 5B are alternately arranged in an annular shape. The part 17 and its end parts are in contact with each other to form an annular yoke part. And this yoke part is magnetically connected to the motor radial direction A outer side edge part of the shaft parts 11 and 15 of each divided core 5A and 5B which forms a teeth part. Further, at the end in the motor circumferential direction B of the yoke forming portion 17, a notch portion 17 a is provided that is fitted around the outer end in the motor radial direction A of the shaft portion 11 of the cored split core 5 </ b> A. The form of the contact part between the yoke forming parts 17 between the notch part 17a and the adjacent split cores 5B is not limited to the form shown in FIG. 3, and various forms can be adopted.

  Such split cores 5A and 5B are integrally formed of a metal magnetic powder or a powder magnetic body obtained by bonding a metal magnetic powder covered with a predetermined insulating film with a resin, and the powder magnetic material is molded into a predetermined shape. It is formed by filling a mold for use and pressurizing and compressing it, followed by heat treatment. As a modification, part or all of the split cores 5A and 5B may be formed of a steel plate magnetic body formed by laminating silicon steel plates.

  As shown in FIG. 6, the coils 7 </ b> A and 7 </ b> B are attached to the split cores 5 </ b> A and 5 </ b> B in a state where the wire is wound around the coil. Specifically, the coil 7A is mounted by inserting the shaft portion 11 of the split core 5A into the coil 7A from the outer side in the motor radial direction A. The coil 7B is mounted by inserting the shaft portion 15 of the split core 5B into the coil 7B from the inner side in the motor radial direction A.

  When the divided stators 3A and 3B are formed in this way, as shown in FIG. 3, two types of divided stators 3A and 3B are alternately arranged in an annular shape and externally fitted with a bake ring ring (not shown). 1 is formed.

  By the way, this stator 1 has a configuration in which the split cores 5A with flanges and the split cores 5B without flanges are alternately arranged. Therefore, simply by combining the split cores 5A and 5B, the split cores 5A with flanges and no flanges are provided. A difference in magnetic characteristics from the split core 5B occurs.

  Accordingly, as a result of the test, the inventor of the present application sets the width Wa along the motor circumferential direction B of the split core 5A with a flange at a predetermined ratio smaller than the width Wb along the motor circumferential direction B of the split core 5B with collar. By doing so, it was found that the magnetic characteristic difference between the split cores 5A and 5B can be substantially eliminated.

  More specifically, in the test, the reduction ratio of the width Wa of the split core 5A with flange and the increase ratio of the width Wb of the split core 5B without flange with respect to the predetermined reference width Wr, and the teeth of the flange portion 13 of the split core 5A with flange. The characteristics were measured by numerical simulation while changing the overhang dimension D1 (see FIG. 4) protruding from the outer peripheral surface in the motor circumferential direction B in various combinations. Specifically, for example, an induced voltage difference between the coil 7A of the split stator 5A and the coil 7B of the split stator 5B to which current of the same phase is supplied when a motor using the stator 1 is driven by three-phase AC is used. Measured. In each simulation test described below, the outer diameter of the core portion of the stator is set to 260 mm, and the inner / outer diameter difference D2 (see FIG. 2) of the core portion is set to 42.4 mm.

  A curve L1 in FIG. 7 shows a relationship (test result) between the increase / decrease width of the widths Wa and Wb of the split cores 5A and 5B and the induced voltage difference between the in-phase coils 7A and 7B. In the test of FIG. 7, the induced voltage difference was measured while changing the widths Wa and Wb of the divided cores 5A and 5B with respect to the reference width Wr = 21 mm. In addition, the overhang | projection dimension D1 of the collar part 13 is set to 2.0 mm, and the thickness T (refer FIG. 4) of the collar part 13 is set to 2.31 mm.

  From the test results of FIG. 7, when the increase / decrease width of the widths Wa and Wb with respect to the reference width Wr = 21 mm slightly exceeds about 1 mm (4.8%), the induced voltage difference becomes a minimum value, and the increase / decrease width is about 0. It can be seen that when the voltage is in the range of .92 mm to about 1.15 mm, that is, in the range of about 4.4% or more and about 5.5% or less, the induced voltage difference is almost within 1%.

  Further, a curve L2 in FIG. 8 (and FIG. 9 showing an enlarged part thereof) shows the relationship between the overhanging dimension D1 of the flange 13 of the flanged split core 5A and the induced voltage difference between the in-phase coils 7A and 7B. (Test results) are shown. In the test of FIG. 8, the induced voltage difference was measured by changing the overhanging dimension D1 of the flange 13. The increase / decrease width of the widths Wa and Wb with respect to the reference width Wr = 21 mm is set to 1.0 mm (4.8%), and the thickness T (see FIG. 4) of the brim portion 13 is set to 2.31 mm.

  From the test results of FIG. 8, the induced voltage difference becomes a minimum value when the overhang dimension D1 of the flange portion 13 is about 2.2 mm, and the overhang dimension D1 is within the range of about 1.8 mm to about 2.4 mm. It can be seen that the induced voltage difference is approximately 1% or less at a certain time. In addition, the curve L2 has a gradual change in the overhang dimension D1 in the range of about 1.8 mm to about 2.4 mm and in the vicinity thereof, and when the overhang dimension D1 is within this range, the curve L2 corresponds to the change in the overhang dimension D1. It can be seen that the change in the induced voltage difference is small.

  For this reason, if the overhanging dimension D1 of the brim portion 13 is in the range of about 1.8 mm to about 2.4 mm, the increase / decrease width of the widths Wa and Wb with respect to the reference width Wr is about 4.4% or more, about 5 If it is set within the range of 5% or less, it can be estimated that the induced voltage difference between the in-phase coils 5A and 5B can be suppressed to about 1%.

  Therefore, in the present embodiment, the overhang dimension D1 of the brim portion 13 is set within a range of about 1.8 mm to about 2.4 mm (for example, 2.0 mm), and the width of the divided cores 5A and 5B with respect to the reference width Wr. The increase / decrease width of Wa and Wb was set within the range of about 4.4% or more and about 5.5% or less (for example, 5.0%).

  Here, the curve L3 in FIG. 10 shows the relationship (test result) between the thickness T of the flange portion 13 of the flanged split core 5A and the induced voltage difference between the in-phase coils 7A and 7B. In the test of FIG. 10, the induced voltage difference was measured by changing the thickness T of the flange 13. The thickness T indicates the thickness along the motor radial direction A of the thickest portion of the base of the flange portion 13, and the increase / decrease width of the widths Wa and Wb with respect to the reference width Wr = 21 mm is 1.0 mm (4.8%). ) And the overhanging dimension D1 of the brim portion 13 is set to 2.0 mm. From the test results of FIG. 10, it can be seen that if the thickness T of the flange portion 13 is about 1.5 mm or more, the induced voltage difference is almost within 1%. However, the thickness of the flange portion 13 provided on the split core 5A of the stator 1 is usually 1 mm or more, and the thickness T of the flange portion 13 is actually a problem in relation to the induced voltage difference or the like. Absent.

  As described above, according to the present embodiment, the width Wa along the motor circumferential direction B of the flanged split core 5A is set smaller than the width Wb along the motor circumferential direction B of the collarless split core 5B. Therefore, it is possible to reduce the magnetic characteristic difference between the split core 5A with brim and the split core 5B without brim. As a result, for example, the coil 7A and the split core 5B without brim are mounted on the split core 5B with brim. The induced voltage difference between the coil 7B and the coil 7B can be reduced, and torque loss or the like can be prevented even if the coils 7A and 7B supplied with the same phase current are connected in parallel. .

  Further, the overhanging dimension D1 of the brim portion 13 of the split core 5A with the brim is set within a range of about 1.8 mm to about 2.4 mm (for example, 2.0 mm), and the split cores 5A and 5B with respect to the reference width Wr. Since the increase / decrease width of the widths Wa and Wb is set within a range of about 4.4% or more and about 5.5% or less (for example, 5.0%), the magnetic characteristic difference between the divided cores 5A and 5B is reduced. It can be suppressed within a predetermined allowable reference range. Thereby, for example, the induced voltage difference between the coils 7A and 7B can be suppressed to about 1% or less. In the stator 1, there are some variations in inductance, resistance, etc. between the coils 7A and 7B due to various factors such as line length errors of the coils 7A and 7B, and an induced voltage difference of about 1% is a problem. Not.

  Further, since the flanged split core 5A has no overhanging portion on the outer side (yoke side) of the shaft portion 11 in the motor radial direction A, the shaft portion 11 is inserted into the coil 7A from the outer side of the motor radial direction A. Thus, the coil 7A can be mounted, and for the split core 5B without brim, there is no overhanging part (head part) on the inner side of the shaft part 15 in the motor radial direction A. The coil 7B can be mounted by inserting it into the coil 7B from the inner side in the direction A, and the coils 7A and 7B can be easily mounted on the split cores 5A and 5B.

  In addition, the split core with flange 5A and the split core without brim 5B are magnetically connected to the outer end of the shaft portion 11 of the split core with flange 5A in the motor radial direction A. Since they are arranged alternately in an annular shape so as to be continuous, it is possible to provide the stator 1 that can be easily assembled while maintaining the magnetic performance of the stator core composed of the split cores 5A and 5B.

It is a perspective view of a stator concerning one embodiment of the present invention. It is sectional drawing which shows the partial structure of the stator of FIG. It is a disassembled perspective view of the stator of FIG. It is sectional drawing of a split core with a collar. It is sectional drawing of a split core without a brim. It is a figure which shows the assembly process of the stator of FIG. It is a graph which shows the relationship between the fluctuation width of a teeth width | variety, and the induced voltage difference of the coil by the presence or absence of a collar. It is a graph which shows the relationship between the flange overhang | projection dimension and the induced voltage difference of the coil by the presence or absence of a flange. It is a graph which expands and shows a part of graph of FIG. It is a graph which shows the relationship between a collar thickness and the induced voltage difference of the coil by the presence or absence of a collar.

Explanation of symbols

1 Stator 3A, 3B Split stator 5A Divided core with flange 5B Divided core without flange 7A, 7B Coil 9 Stator core 11 Shaft portion 13 Flange portion 15 Shaft portion 17 Yoke forming portion A Motor radial direction B Motor circumferential direction D1 Overhang dimension of flange portion T Thickness of brim portion Wa, Wb Width of split core

Claims (4)

It has a stator core in which the teeth with flanges and the teeth without flanges are mixed,
A stator in which a width along the motor circumferential direction of the bristle tooth portion is set smaller than a width along the motor circumferential direction of the bristleless tooth portion. The stator according to claim 1,
The width of the bristle tooth portion is set to be smaller than the reference width by about 4.4% or more and about 5.5% or less with reference to a predetermined reference width,
The width of the bristleless teeth portion is set to be larger than the reference width in a range of about 4.4% or more and about 5.5% or less with respect to the reference width. Stator. The stator according to claim 1 or 2,
The stator is characterized in that an overhang dimension in which the brim portion of the bristle tooth portion projects from the outer peripheral surface of the tooth in the circumferential direction of the motor is set in a range of about 1.8 mm or more and about 2.4 mm or less. The stator according to any one of claims 1 to 3,
The stator core is
A split core with a flange having a substantially cylindrical shaft portion extending along the motor radial direction and a flange portion formed on the inner end portion in the motor radial direction of the shaft portion;
No flange having a substantially cylindrical shaft portion extending along the motor radial direction and a yoke forming portion extending along the motor circumferential direction from the motor radial direction outer side end portion of the shaft portion Split core,
With
The flanged teeth portion is constituted by the shaft portion and the flange portion of the flanged split core,
The bristleless teeth part is constituted by the shaft part of the brimless core.
The flanged split core and the flangeless split core are configured such that the yoke forming portion of the flangeless split core is connected in a magnetic circuit manner to the end portion on the outer side in the motor radial direction of the shaft portion of the flanged split core. Further, the stator is alternately arranged in an annular shape.

Images