JP2015220875A - Stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of a rotary electric machine in which when an outer peripheral-side core and an inner peripheral side core are fitted to each other, centers of the cores can be aligned easily.SOLUTION: A stator 100 of a rotary electric machine has: an inner peripheral-side core 111 comprising teeth 109 extending radially toward an outer periphery of the rotary electric machine; a stator winding 107 arranged between the teeth 109; and an outer peripheral-side core 110. When the stator 100 is formed by press-fitting the outer peripheral-side core 110 into tip parts of the teeth 109 from a shaft direction of the rotary electric machine, on one end surface in the shaft direction of the inner peripheral-side core 111 is arranged an end plate 112 whose planar shape is identical to the planar shape of the inner peripheral-side core 111, and in the end plate 112, at a site which is a surface where the inner peripheral-side core 111 contacts the outer peripheral-side core 110 and arranged at a position overlapping in the shaft direction, provided is a second chamfer part 114.

Description

  The present invention relates to a stator of a rotating electric machine.

  As a means for improving the performance of the rotating electrical machine, it is conceivable to improve the winding space factor in the stator core slot of the stator. One of means for realizing this is a method of dividing the stator core. Since an integrated iron core requires a work space for winding, a gap remains in the slot after winding, whereas in the stator core splitting system, a previously split core is assembled after winding. This eliminates the need for a work space for winding.

  There are many types of stator core division methods, one of which is an inner / outer division core method that divides the core into two: an inner core that includes radial teeth and an outer core that has a substantially cylindrical shape. . The entire stator is configured by winding the inner peripheral side iron core alone and combining the outer peripheral side iron core after the winding. According to this method, it is possible to manufacture a stator that maximizes the coil space factor.

  In Patent Document 1, concentrated winding is applied to an inner and outer divided iron core system. The resin insulator is wound beforehand, and it is fitted into the teeth portion of the inner peripheral iron core. When the winding is directly applied to the teeth portion, a work space for winding is required between the windings of the adjacent teeth, so that a gap is always generated between the windings. On the other hand, if it is a system which inserts the insulator by which winding was carried out as shown in patent documents 1, since the gap between each winding can be minimized, space factor can be improved. .

  And after winding to an inner peripheral side iron core, a stator is comprised combining an outer peripheral side iron core. At this time, in order to prevent an increase in magnetic resistance in the stator core, it is desirable not to create a gap between the inner peripheral side iron core and the outer peripheral side iron core. Moreover, since torque and vibration act on the stator, it is necessary to hold both of them mechanically. Therefore, press fitting is generally used for assembling the inner peripheral side iron core and the outer peripheral side iron core. Patent Document 1 relates to a stator in which concentrated winding is applied to an inner and outer divided core system, but even when applied to distributed winding, the work space of the winding is similarly eliminated, so that the winding space factor in the slot is improved. Can be achieved.

JP 2001-161039 A

  As described above, in the inner and outer divided core systems, the inner peripheral core and the outer peripheral core are generally assembled by press fitting. However, when press-fitting, it is necessary to match the axes of the inner and outer iron cores with high accuracy and to adjust the angles of each other with high accuracy. If these alignments are insufficient, there is a problem that press fitting cannot be performed, or iron cores are galling during press fitting, and an excessive load acts on a part of the iron core to break the core. .

  The present invention has been made to solve the above-described problems. When the outer peripheral iron core and the inner peripheral iron core are fitted, the center of the rotating electric machine can be easily aligned. The purpose is to provide children.

  A stator of a rotating electrical machine according to the present invention includes an inner peripheral side iron core having teeth extending radially toward the outer peripheral direction of the rotary electric machine, a stator winding disposed between the teeth, and an outer peripheral side iron core. The outer peripheral side iron core is formed by press-fitting from the axial direction of the rotating electrical machine to the tip of the teeth, and the planar shape is the same as the inner peripheral side iron core at one end surface in the axial direction of the inner peripheral side iron core. In addition to arranging an end plate, a second chamfer is provided at a portion of the end plate that is in the plate thickness direction and is a contact surface between the inner peripheral side iron core and the outer peripheral side iron core, and is disposed at a position overlapping in the axial direction. A part is provided.

  In the stator of the rotating electrical machine configured as described above, in the press-fitting process between the inner peripheral side iron core and the outer peripheral side iron core, the center axis shift between the inner peripheral side iron core and the outer peripheral side iron core is caused by the second chamfered portion. Since it is eliminated, it is possible to easily position both iron cores and reduce press-fitting defects.

1 is a cross-sectional view showing a rotating electrical machine according to Embodiment 1. FIG. It is a plane fragmentary sectional view which shows a stator part. It is a fragmentary perspective view which shows an inner peripheral side iron core part. It is the front view which looked at one teeth from the X direction of FIG. It is the front view which looked at one teeth from the X direction of FIG. It is a plane fragmentary sectional view which shows a stator part. It is the top view (A) and front view (B) which show a turtle shell coil. It is sectional drawing which shows a mode that a tortoiseshell coil is integrated in an inner peripheral side iron core. It is the front view (A) which shows the shape of the turtle shell coil before an assembly, and the front view (B) which shows the shape of the turtle shell coil after an assembly. It is a front view which shows the state which inserts a turtle shell coil in an inner peripheral side iron core. It is a partial side sectional view showing a series of processes for press-fitting an inner peripheral side iron core and an outer peripheral side iron core. It is a partial side sectional view showing a series of processes for press-fitting an inner peripheral side iron core and an outer peripheral side iron core. It is a partial side sectional view showing a series of processes for press-fitting an inner peripheral side iron core and an outer peripheral side iron core.

Embodiment 1 FIG.
Hereinafter, the present embodiment will be described with reference to the drawings. 1 is a cross-sectional view showing a rotating electrical machine according to Embodiment 1. FIG. The stator 100 is configured in a substantially cylindrical shape, and the outer periphery is held by a motor case 102. The rotor 101 is disposed inside the stator 100 via a predetermined gap. In the rotor 101, a permanent magnet 101b is fixed to the outer peripheral surface of a rotor core 101a having a substantially cylindrical shape by bonding, and a shaft 101c is fixed to the center of the rotor core 101a so as to be integrated with the rotor core 101a. It has become. The shaft 101 c is supported by a bearing 104 incorporated in the motor case 102 and a bearing 105 incorporated in the bearing holder 103.

  FIG. 2 is a plan partial sectional view showing a stator portion. In FIG. 2, the stator is electrically insulated from a stator winding 107 disposed in a plurality of slots 106 formed in the stator core 100a, and between the stator core 100a and the stator winding 107. Insulator 108 is provided. The stator winding 107 is disposed between the plurality of teeth 109. In addition, although the circumference | surroundings of the conductor which comprises the stator winding | coil 107 are apply | coated with the insulation coating materials, such as a polyimide, each are electrically insulated from each other, illustration is abbreviate | omitted in FIG. The stator core 100a includes an inner peripheral side core 111 having teeth 109 extending radially toward the outer peripheral direction of the rotating electrical machine, and an outer peripheral side core 110, which are assembled and integrated by press-fitting. The press-fitting process will be described later.

  FIG. 3 is a partial perspective view showing 111 parts of the inner peripheral iron core. In the figure, the stator winding is not shown. The stator core 100a is configured by stacking thin steel plates in order to reduce loss due to eddy current, and the inner peripheral iron core 111 has a structure in which a plurality of steel plates are also stacked. An end plate 112 having a planar shape substantially the same as the inner peripheral side iron core is disposed on the end surface of the inner peripheral side iron core 111 in the rotating electric machine axial direction. The end plate 112 is caulked to the end surface of the inner peripheral iron core 111 and fixed by welding or bonding. FIG. 4 is a front view of one tooth viewed from the X direction of FIG. The end plate 112 may be provided only on one end surface of the inner peripheral iron core 111 or may be provided on both end surfaces. Examples of the material of the end plate 112 include iron, and the end plate 112 can be made of a steel plate. In this case, it is not always necessary to use the same material as that of the steel plate constituting the laminated steel plate of the iron core. For example, the laminated steel plate may be made of an electromagnetic steel plate and the end plate may be a general rolled steel plate. Other metal materials such as stainless steel, copper, and aluminum are also applicable as the end plate material. Furthermore, the end plate 112 can be formed of resin or cardboard.

  As shown in FIG. 4, a first chamfered portion 113 is applied to the tooth side surface portion of the end plate 112 at the upper surface corner portion. Note that the upper surface in this case is an end plate 112 on the side where the inner peripheral iron core 111 and the outer peripheral iron core 110 first contact each other when the inner peripheral iron core 111 and the outer peripheral iron core 110 are assembled by press fitting, as will be described later. This is the end face. The angle A of the first chamfered portion 113 is 15 degrees to 45 degrees. When the angle A of the first chamfered portion 113 is 15 degrees or less, the distance B from the corner 113a at the upper end of the first chamfered portion 113 to the end surface 112a of the end plate becomes small. When the coil is pressed against the corner 113b, the coil insulation film and the insulator are damaged, and the electrical insulation performance is lowered.

  Conversely, if the angle A exceeds 45 degrees, the insulator 113 and the coil insulating film are damaged by the corner 113b at the lower end of the chamfered portion. The plate thickness C in the axial direction of the end plate 112 is assumed to be larger than the thickness of one laminated steel plate constituting the inner peripheral iron core 111. The coil insulating film and the insulator can be protected to some extent by chamfering the end of the laminated steel sheet, but it is not sufficient. Therefore, by adding the end plate 112, a large chamfered portion that cannot be formed by the laminated steel plate is provided. Therefore, the plate thickness C of the end plate 112 needs to be larger than that of the laminated steel plate. The shape of the upper surface corner may be an arc shape as shown in FIG. 5. In this case, the end surface 112a of the end plate has a shape in which the arc and the end surface are in contact with each other. In order to provide a chamfered portion to protect the coil inserted here, the thickness of the end plate 112 is designed to be minimum. Although it is possible to provide a chamfer on one steel sheet of the laminated steel sheets constituting the iron core, the end plate 112 is disposed when this is not sufficient. Therefore, in order to chamfer larger than the steel plate, the end plate 112 needs to have a plate thickness equal to or greater than one steel plate.

  On the other hand, no end plate is disposed on the outer peripheral side iron core 110. Therefore, for the end plate 112 attached to the inner peripheral iron core 111, there is no steel plate to be abutted against the outer peripheral iron core 110. Therefore, even when the end plate 112 is made of a steel plate, the magnetic circuit of the end plate portion is incomplete, and therefore, the number of stacked stator cores 100a is not increased electromagnetically. In addition, even when the number of laminated steel cores 110 on the outer peripheral side core 110 is increased and a steel plate that is in contact with the end plate 112 is disposed, the end plate 112 is chamfered, so that it is between the outer peripheral side cores 110. The air gap exists and the magnetic resistance increases. For the above reasons, even when the end plate 112 is made of a steel plate, it contributes only slightly to the performance improvement as a part of the stator core 100a electromagnetically. On the other hand, when the end plate 112 is disposed, there are disadvantages such as an increase in product size due to an increase in the total laminated thickness of the stator core 100a, an increase in cost due to an increase in coil length, and an increase in coil resistance value. Therefore, it is desirable that the end plate 112 has a minimum thickness necessary for coil protection. Considering the protection of the coil, the length of the chamfered portion of the end plate 112 is half of the plate thickness C, and the required chamfer size is about the coil wire diameter at the maximum, so that the plate thickness C of the end plate 112 is at least What is necessary is just about twice the coil wire diameter.

  As shown in FIG. 3, a second chamfered portion 114 is further provided at the front face corner portion of the end plate 112 and at the upper corner portion. That is, when the inner peripheral side iron core 111 and the outer peripheral side iron core 110 are assembled by press-fitting, the second chamfered portion 114 is provided at the corner of the end face 112 where the outer peripheral side iron core 110 first contacts. It does not make sense to first provide the second chamfered portion 114 on the end surface other than the end surface of the end plate 112 with which the outer peripheral iron core 110 contacts. The second chamfered portion 114 has the same cross-sectional shape as the first chamfered portion 113 provided on the side surface of the tooth. In FIG. 3, the first chamfered portion 113 and the second chamfered portion 114 have the same cross-sectional shape, but are not necessarily the same. The first chamfered portion 113 is a chamfered portion for protecting the coil, and the second chamfered portion 114 is a chamfered portion for guiding the outer peripheral side iron core 110. Since the respective purposes are different, there is no problem even if the shapes are different from each other, and both may have the same cross-sectional shape as long as each purpose can be achieved.

  In the first embodiment, a distributed winding method is adopted, and the stator winding 107 is wound so as to connect a certain slot and another slot separated from the slot by a predetermined pitch. For example, as shown in FIG. 6, the conductor 115 disposed on the inner peripheral side in the slot is paired with the conductor 117 disposed on the outer peripheral side of the slot that is 6 slots counterclockwise therefrom, The conductor 116 disposed in the same slot also makes a pair with the conductor 118 separated by six slots. Similarly, the conductor 119 and the conductor 120 arranged in adjacent slots also form a pair with the conductor 121 and the conductor 122 which are separated by six slots, respectively. And these conductors which make a pair are connected in the axial direction edge part of a stator core, and the coil end is comprised by the connection part.

  As a method of configuring the stator winding as described above, there is a turtle shell coil 123 shown in FIG. FIG. 7A is a plan view showing the turtle shell coil, and FIG. 7B is a front view of the same. The tortoiseshell coil 123 has straight portions 123a and 123b arranged in the slots, and the length of the straight portions is at least equal to or higher than the axial height of the inner peripheral iron core 111. Furthermore, it comprises coil end portions 123c and 123d that connect the straight portions 123a and 123b, and coil end portions 123e and 123f that become connection portions with other turtle shell coils or terminal portions of the stator winding. The coil is formed using a copper wire coated with an insulating coating material such as polyimide, and the cross-sectional shape of the copper wire is a square or a circle.

  In order to increase the space factor in the slot, in the case of a square cross-section, the cross-sectional shape is such that a gap is not left in the slot as much as possible when the straight portion is arranged in the slot. In the case of a circular cross section, the gap with the stator core becomes large when it is placed in the slot. Therefore, the coil cross section is formed so that only the straight portions 123a and 123b arranged in the slot have a square cross section. May be. In this case, there is an effect that the space factor can be improved by making a square section only at a necessary portion while using an inexpensive round wire.

  Next, a method for incorporating the turtle shell coil 123 into the inner peripheral iron core 111 will be described. The tortoiseshell coil 123 has straight ends 123a and 123b connected at both ends with coil end portions 123c and 123d. Since the coil ends 123c and 123d interfere with the teeth 109 of the inner peripheral iron core 111, they are assembled into the slot 106 from the axial direction. I can't. Therefore, the tortoiseshell coil 123 is arranged at a location away from the inner peripheral side iron core 111 in the radial direction, and the tortoiseshell coil 123 is pushed inward from the inside in the radial direction to incorporate the tortoiseshell coil 123 at a predetermined position in the slot 106. . FIG. 8 is a cross-sectional view showing the positional relationship between the inner periphery side iron core 111 and the tortoiseshell coil 123 during assembling work.

  The tortoiseshell coil straight portions 123a and 123b after the completion of the assembly are the coil positions 124 and 125, respectively, whereas the initial positions for the assembly operation are at the coil positions 126 and 127 that are separated outward in the radial direction. The axial positions of the inner peripheral iron core 111 and the tortoiseshell coil 123 are set such that both end surfaces of the inner peripheral iron core 111 are included in the range of the straight portions 123a and 123b of the tortoiseshell coil 123. From the initial coil positions 126 and 127, the tortoise shell coil 123 is pushed in the direction of the arrow in the radial direction so that the tortoise shell coil 123 enters the bottom of the slot 106. Thereby, the tortoiseshell coil 123 is placed in a predetermined position in the slot 106, and the incorporation of the tortoiseshell coil 123 into the inner peripheral iron core 111 is completed. For the sake of clarity, only one turtle shell coil is shown in FIG. 8, but in reality, the turtle shell coils 123 are arranged in all the slots 106, and all the turtle shell coils 123 are inserted into the slots in the same manner as described above. Need to be pushed into 106.

  After performing the above assembling process, the pitch of the turtle shell coil straight portions 123a and 123b decreases from D to E. Since the coil end portions 123c and 123d are continuous with the straight portions 123a and 123b, the coil end portions 123c and 123d are also deformed when the pitch of the straight portions 123a and 123b is reduced. FIG. 9A is a front view showing the shape of the turtle shell coil 123 before assembling, and FIG. 9B is a front view showing the shape of the turtle shell coil 123 after assembling. As the pitch of the straight portions 123a and 123b changes from D to E before and after assembly, the coil end portions 123c and 123d are deformed so that the apexes of a substantially triangular shape become higher.

  As described above, since it is necessary to deform the coil end portions 123c and 123d to reduce the pitch of the straight portions 123a and 123b when incorporating the coil, a large load acts between the tortoiseshell coil 123 and the laminated iron core. Since the coil end portions 123c and 123d are deformed, the load is concentrated and acts in the vicinity of both end surfaces in the axial direction of the inner peripheral iron core 111 close to the coil end portions 123c and 123d. FIG. 10 is a front view showing a state in which the turtle shell coil is inserted into the inner peripheral iron core. When the coil is assembled, the tortoiseshell coil 123 is pressed against the inner peripheral iron core 111, but since the end plate 112 is provided on the end surface of the laminated iron core, most of the load is received by the end plate 112.

  At this time, since the end plate 112 is provided with the first chamfered portion 113, the contact range is widened, and the load acting on the unit area is reduced. That is, in the end plate 112 having substantially the same shape as the inner peripheral side iron core 111, the first chamfered portion 113 is formed at a position in the plate thickness direction and forming a part of the outer periphery of the slot 106 portion into which the turtle shell coil 123 is inserted. By providing this, damage to the insulator 108 and the coil insulating film sandwiched between the turtle shell coil 123 and the end plate 112 can be avoided. In the absence of the end plate 112, a large load acts on the corners of the laminated core end face, and therefore a large load acts locally. As a result, the insulator 108 and the coil insulation film may be damaged, and the stator winding 107 may come into direct contact with the iron core. However, in this embodiment, such a fear is eliminated.

  Next, the outer peripheral side iron core 110 is press-fitted into the tip end portion of the teeth 109 of the inner peripheral side iron core 111 incorporating the turtle shell coil 123. 11 to 13 are partial side sectional views showing a series of processes for press-fitting the inner peripheral iron core 111 and the outer peripheral iron core 110 after winding. In the drawing, the coil is omitted for easy understanding, and the cross section of the portion of the tooth 109 is shown enlarged. FIG. 11 shows the position of the iron core before press-fitting. Here, the inner peripheral iron core 111 is fixed, and the outer peripheral iron core 110 is moved downward from the upper side of the drawing to press-fit. In FIG. 11, the fitting surface 111 a at the tip of the tooth of the inner peripheral side iron core 111 and the fitting surface 110 a of the outer peripheral side iron core 110 are not on the same plane, and the center axis of the two iron cores is displaced. Yes.

  FIG. 12 shows a state where the lower surface of the outer peripheral side iron core 110 is lowered until it comes into contact with the end plate 112 disposed on the inner peripheral side iron core 111, and the lower end portion of the outer peripheral side iron core fitting surface 110 a is the teeth of the end plate 112. The second chamfered portion 114 provided at the tip of the portion is in contact. When the outer peripheral side iron core 110 contacts a part of the second chamfered portion 114 of the end plate 112, a force acts in the lateral direction on the outer peripheral side iron core 110, and the deviation of the central axis from the inner peripheral side iron core 111 is small. Move in the direction. When the outer peripheral side iron core 110 is further lowered, the chamfered portion 114 of the end plate 112 eliminates the deviation of the central axis between the inner peripheral side iron core 111 and the outer peripheral side iron core 110, and as shown in FIG. The fitting surface of the inner peripheral iron core 111 is the same surface. By further pressing down the outer peripheral iron core 110 from this state, the inner peripheral iron core 111 and the outer peripheral iron core 110 are press-fitted and fixed.

As described above, when the outer peripheral side iron core 110 and the inner peripheral side iron core 111 are fitted, the second chamfered portion 114 is provided on the end cross section of the end plate 112 so that the centers of both can be easily aligned. Can do. That is, in the end plate 112 having substantially the same shape as the inner peripheral side iron core 111, it is in the thickness direction, is a contact surface between the inner peripheral side iron core 111 and the outer peripheral side iron core 110, and is arranged at a position overlapping in the axial direction. By providing the second chamfered portion at the site, the center of both can be easily adjusted. Although the case where the second chamfered portion 114 is formed with a linear slope has been described above, the same effect can be obtained even when the second chamfered portion 114 is formed in an arc shape as shown in FIG. In this embodiment, the case where the slots separated by 6 slots are connected as the arrangement of the turtle shell coil 123 has been described. However, this slot pitch can take an integer value of 2 or more depending on the electromagnetic design of the rotating electrical machine. Even if the slot pitch is configured as described above, the same effect as described above can be obtained.
In the present invention, it is possible to freely combine the respective forms within the scope of the invention, or to appropriately modify and omit the respective forms.

100 stator, 106 slots, 107 stator winding, 109 teeth,
110 outer peripheral iron core, 111 inner peripheral iron core, 112 end plate, 113 first chamfered portion,
114 Second chamfer.

Claims (2)

An inner peripheral side iron core having teeth extending radially toward the outer peripheral direction of the rotating electrical machine, a stator winding disposed between the teeth, and an outer peripheral side iron core, the outer peripheral side iron core being the rotating electrical machine A stator of a rotating electrical machine formed by press-fitting from the axial direction to the tip of the tooth, and the planar shape is the same as the inner peripheral iron core at one end surface in the axial direction of the inner peripheral iron core A certain end plate is disposed, and the end plate has a plate thickness direction, a contact surface between the inner peripheral side iron core and the outer peripheral side iron core, and a portion disposed at a position overlapping in the axial direction. A stator for a rotating electric machine, wherein two chamfered portions are provided. 2. The end plate is provided with a first chamfered portion at a position in the plate thickness direction and forming a part of an outer periphery of a slot portion into which the stator winding is inserted. Stator of rotating electrical machine.

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