JP2015065739A - Refrigerant passage structure of rotor core - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant passage structure of rotor core which allows for measurement of the position of a passage in the rotor core.SOLUTION: The refrigerant passage structure of a rotor core has a first passage 13 extending in the axial direction of the rotor, a second passage 18 extending in the radial direction of the rotor and interconnecting the first passage 13 and a second refrigerant supply passage 6 formed in the shaft 3, and a protrusion 21 located on the same rotor shaft right-angle plane as the second passage 18 and protruding inward of the first passage 13. With such an arrangement, a determination can be made easily with high accuracy whether or not the second passage 18 of the rotor core 2 is located at a proper position for the second refrigerant supply passage 6, by measuring the distance between the end face 16 of the rotor core 2 and the protrusion 21.

Description

  The present invention relates to a refrigerant flow structure of a rotor core, for example, a refrigerant flow structure of a rotor core of a permanent magnet field motor used as a motor generator of a hybrid vehicle.

  A permanent magnet field motor (PM motor) is employed in a motor generator of a hybrid vehicle, for example. An embedded magnet type permanent magnet field motor (hereinafter referred to as “IPM motor”) in which a permanent magnet is embedded in a rotor core (iron core) is particularly suitable for a motor generator of a hybrid vehicle. As is well known, in the IPM motor, the temperature of the permanent magnet rises due to the iron loss at the time of high-speed rotation of the rotor, and as a result, the load efficiency is lowered. In view of this, a rotor core refrigerant flow path structure in which a permanent magnet is cooled by forming a flow path in the rotor core and circulating the refrigerant in the flow path has been put into practical use. The rotor core of such an IPM motor is typically configured by laminating electromagnetic steel plates along the rotor axis (see, for example, “Patent Document 1”).

  By the way, in the refrigerant flow path structure described in Patent Document 1, the rotor core extends along the rotor axis and passes through the rotor core (hereinafter referred to as “first flow path”), and extends in the rotor radial direction. A flow path (hereinafter referred to as a “second flow path”) that connects the one flow path and the refrigerant supply path formed on the rotating shaft. In this refrigerant flow path structure, the refrigerant is supplied from the refrigerant supply path formed on the rotating shaft to the first flow path via the second flow path. And a 2nd flow path is comprised by forming the slit extended in a radial direction in a specific electromagnetic steel plate. Here, in the assembled rotor core, since the laminated electromagnetic steel sheets are pressed in the axial direction (stacking direction), the total length (the length along the rotor shaft) varies depending on the degree of pressurization. As a result, the connection port (opening portion) on the second flow path side and the connection port (opening portion) on the refrigerant supply path side may be displaced in a direction along the rotor axis (hereinafter referred to as “rotor axial direction”). is there.

  Therefore, it is desired to measure the position of the second flow path, that is, to measure the distance from the end surface (reference) of the rotor core to the second flow path, but the position of the second flow path of the assembled rotor core It is difficult to directly measure the flow rate. For example, the communication between the refrigerant supply path and the second flow path has been inspected by supplying the inspection fluid to the refrigerant supply path of the rotating shaft. Since this inspection method requires labor and time, the efficiency of inspection has been demanded.

JP 2009-290979 A

  Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rotor core refrigerant flow path structure capable of measuring the position of the rotor core flow path.

  In order to solve the above problems, the rotor core refrigerant flow path structure according to the present invention includes a first flow path extending along the rotor axis and having an open end, and a first flow path extending in a radial direction of the rotor. A coolant flow path structure of a rotor core having a second flow path communicating with a coolant supply path formed on a rotating shaft, wherein the first flow path is located at a position corresponding to the second flow path. It has the protrusion part which protrudes to the inner side of a 1st flow path.

  ADVANTAGE OF THE INVENTION According to this invention, the refrigerant | coolant flow path structure of the rotor core which can measure the position of the flow path of a rotor core can be provided.

It is the schematic for demonstrating the refrigerant | coolant flow path structure which concerns on this embodiment, Comprising: It is a figure which shows a part of cross section by the axial plane of a rotor especially. It is a top view of the electromagnetic steel plate in which the slit and protrusion shape are not formed in the 1st channel, and is a figure showing a permanent magnet with a section (shaded line) especially. It is a top view of the electromagnetic steel plate in which the slit and protrusion shape are formed in the 1st channel, and is a figure showing a permanent magnet with a section (shaded line) especially. It is a figure which expands and shows a part of FIG.

  An embodiment of the present invention will be described with reference to the accompanying drawings. Hereinafter, the rotor core refrigerant flow path structure (hereinafter referred to as “refrigerant flow path structure”) according to the present embodiment is used as an embedded magnet type permanent magnet field motor (hereinafter referred to as “IPM motor”) used as a motor generator of a hybrid vehicle. Will be described. The IPM motor has the same configuration as the prior art except for the refrigerant channel structure. Therefore, in order to simplify the description, the description of the same configuration as the prior art IPM motor including the stator is omitted.

  FIG. 1 is a schematic view of a rotor 1 including a refrigerant flow path structure according to the present embodiment, and in particular, a part of a cross section by an axial plane with the rotor axis C as an axis (on the upper side from the rotor axis C in FIG. 1). FIG. As shown in FIG. 1, the rotor 1 includes a rotor core 2 (iron core) and a shaft 3 (rotary axis) whose center line coincides with the rotor axis C. The shaft 3 has a flange 4 that positions the rotor core 2 in the rotor axial direction (left-right direction in FIG. 1). The shaft 3 includes a first refrigerant supply path 5 formed on the center line of the shaft 3 and extending in the rotor axial direction, and a second refrigerant supply path 6 extending in the rotor radial direction (vertical direction in FIG. 1). .

  The first refrigerant supply path 5 includes a refrigerant supply port 7 at the end of the shaft 3 on the base end side (left side in FIG. 1), and the end on the tip side (right side in FIG. 1) of the shaft 3 is blocked by a plug or the like. Is done. The second refrigerant supply path 6 has an inner opening 8 at one end opened to the first refrigerant supply path 5 and an outer opening 9 at the other end opened to the outer peripheral surface of the shaft 3. In other words, the second refrigerant supply path 6 communicates the inner peripheral surface and the outer peripheral surface of the shaft 3. In the shaft 3, four second refrigerant supply paths 6 are equally arranged around the center line (rotor axis C) at an angle phase of 90 °. Further, by making the first refrigerant supply path 5 a blind hole that opens on the base end side of the shaft 3, it is possible to omit a closing means such as a plug.

  As shown in FIG. 1, the rotor core 2 is configured by laminating circular electromagnetic steel plates 10A and 10B in the rotor axial direction. Here, FIG. 2 shows a plan view of the electromagnetic steel sheet 10A, and FIG. 3 shows a plan view of the electromagnetic steel sheet 10B. As described above, FIG. 1 is a schematic diagram for explaining the refrigerant flow path structure according to the present embodiment. Therefore, the scale between the components in FIG. 1 is the scale between the components in FIGS. 2 and 3. Is different. Further, the laminated electromagnetic steel plates 10A and 10B are pressurized in the rotor axial direction by the flange 4 of the shaft 3 and the stopper 23 fixed to the shaft 2.

  The rotor core 2 is formed in a cylindrical shape, and the outer periphery of the shaft 3 is fitted to the inner periphery of the rotor core 2. A plurality (eight in this embodiment) of permanent magnets 11 (for example, neodymium magnets) extending in the rotor axial direction are embedded in the rotor core 2. Each permanent magnet 11 is formed in a rectangular section (hereinafter referred to as “axis-perpendicular section”) having a plane perpendicular to the axis with the rotor axis C as an axis, and is positioned at 180 ° with the permanent magnet 11 positioned at 0 ° in FIG. It arrange | positions so that the permanent magnet 11 may oppose, and it arrange | positions so that the permanent magnet 11 located in 90 degrees and the permanent magnet 11 located in 270 degrees may oppose.

  A pair of permanent magnets 11 arranged symmetrically with respect to a specific axial plane are arranged on both sides in the rotor circumferential direction of each permanent magnet 11 located at 0 °, 90 °, 180 ° and 270 ° in FIG. Is done. 2 and 3 are not intended to limit the number of poles of the rotor 1 and the number and arrangement of the permanent magnets 11. 2 and FIG. 3 is a cavity extending in the rotor axial direction along the permanent magnet 11.

  As shown in FIG. 1, the rotor core 2 has a first flow path 13 that extends in the axial direction of the rotor and has end portions 14 and 15 opened to the end surfaces 16 and 17 of the rotor core 2. As shown in FIG. 2 and FIG. 3, the first flow path 13 has a square cross section perpendicular to the axis, and is equally distributed around the shaft 3 (rotor axis C) at an angle phase of 90 °. In addition, each 1st flow path 13 is arrange | positioned so as to oppose each corresponding permanent magnet 11 located in 0 degree, 90 degrees, 180 degrees, and 270 degrees in FIG.

  The rotor core 2 has a plurality (four in this embodiment) of second flow paths 18 extending in the rotor radial direction. Each second flow path 18 communicates with each corresponding first flow path 13 and each corresponding second refrigerant supply path 6. In other words, each first flow path 13 communicates with the first refrigerant supply path 5 via each corresponding second flow path 18 and each corresponding second refrigerant supply path 6. As shown in FIG. 3, each second flow path 18 is configured by forming a plurality of (four in this embodiment) slits 19 extending in the rotor radial direction in the electromagnetic steel sheet 10B. Each slit 19 extends between the corresponding first flow path 13 and the shaft hole 20.

  In FIG. 1, which is a schematic diagram, the second flow path 18 is adjacent to each other, that is, on both sides in the rotor axial direction across the slits 19 of the two electromagnetic steel plates 10B and the two electromagnetic steel plates 10B. It is formed by a pair of electromagnetic steel plates 10A to be arranged. In the refrigerant channel structure according to the present embodiment, the second channel 18 is formed by stacking two electromagnetic steel plates 10B. For example, by stacking three or more electromagnetic steel plates 10B, It can be formed, or can be formed by only one electromagnetic steel sheet 10B.

  As shown in FIG. 1, the rotor core 2 has a protruding portion 21 that protrudes inward of the first flow path 13. As shown in FIG. 4, the protruding portion 21 forms a protruding shape 22 that protrudes to the inside of the first flow path 13 (a square hole in the electromagnetic steel plate 10B alone) on the electromagnetic steel plate 10B in which the slit 19 is formed, It is formed by laminating the electromagnetic steel plates 10B and overlapping the protruding shapes 22 between the electromagnetic steel plates 10B in the rotor axial direction. That is, the protruding shape 22 constituting the protruding portion 21 and the slit 19 constituting the second flow path 18 are located on the same electromagnetic steel plate 10B. In other words, the protruding portion 21 is positioned on the same rotor axis perpendicular plane as the second flow path 18 (axis perpendicular plane with the rotor axis C as the axis).

  In the refrigerant flow path structure according to the present embodiment, the protruding shape 22 is formed in each first flow path 13 of the electromagnetic steel sheet 10B as shown in FIG. Of the first flow paths 13 may be formed in at least one first flow path 13. In other words, the protrusion 21 may be formed only in the specific first flow path 13 among the plurality of first flow paths 13.

Next, the operation of the refrigerant channel structure according to the present embodiment will be described.
The refrigerant pumped by a pump (not shown) is supplied from the refrigerant supply port 7 to the first refrigerant supply path 5, and further, each second refrigerant supply path 6, each second flow path 18, and each first flow path 13. And are discharged from the end portions 14 and 15 of each first flow path 13. As a result, the rotor core 2 and, in turn, each permanent magnet 11 is cooled. As a result, the temperature increase of the permanent magnet 11 due to the iron loss during high-speed rotation of the rotor 1 is suppressed, and the load efficiency of the IPM motor is reduced. Decline can be prevented. In addition, the refrigerant | coolant discharged | emitted from the edge parts 14 and 15 of each 1st flow path 13 is collect | recovered by the refrigerant | coolant collection part of the motor casing which abbreviate | omits illustration.

  On the other hand, in the refrigerant flow path structure according to the present embodiment, in the manufacturing process (inspection process), the end surface 16 of the rotor core 2 of the assembled rotor 1 and the measurement surface 21A of the protrusion 21 in the first flow path 13 Is measured (L in FIG. 1), and the measured value is compared with the distance (design value) from the reference surface 4A of the flange 4 to the second refrigerant supply path 6 to determine the second of the rotor core 2. Whether or not the flow path 18 is in an appropriate position with respect to the second refrigerant supply path 6 of the shaft 3, that is, whether or not the position of the second flow path 18 is within a predetermined tolerance and It is possible to determine with high accuracy. The means for measuring the distance between the end face 16 of the rotor core 2 and the measurement surface 21A of the protruding portion 21 in the first flow path 13 is appropriately selected from known measurement means regardless of contact type or non-contact type. Can do.

This embodiment has the following effects.
According to this embodiment, the rotor core 2 includes a first flow path 13 extending in the rotor axial direction, and a second refrigerant supply path formed in the first flow path 13 and the shaft 3 (rotating shaft) extending in the rotor radial direction. 6, a second flow path 18 that communicates with the first flow path 6, and a protruding portion 21 that is located on the same plane perpendicular to the rotor axis as the second flow path 18 and protrudes to the inside of the first flow path 13. In other words, the refrigerant flow path structure according to the present embodiment has a protruding portion 21 that protrudes inward of the first flow path 13 at a portion of the first flow path 13 corresponding to the connection portion with the second flow path 18. Prepare.

  Thus, by measuring the distance between the end face 16 of the rotor core 2 and the protruding portion 21, is the second flow path 18 of the rotor core 2 in an appropriate position with respect to the second refrigerant supply path 6 of the shaft 3? It is possible to easily determine with high accuracy whether or not the position of the second flow path 18 is within a predetermined tolerance. As a result, it is possible to improve the efficiency of the process of inspecting the communication between the second refrigerant supply path 6 and the second flow path 18, and thus, the entire manufacturing process can be rationalized.

In addition, embodiment is not limited above, For example, it can comprise as follows.
In the present embodiment, a mode in which the rotor core 2 is configured by two types of electromagnetic steel plates 10A and 10B, that is, a mode in which the second refrigerant supply path 6 and the second flow path 18 are located only on one plane perpendicular to the rotor axis. As described above, for example, when the second refrigerant supply path 6 and the second flow path 18 are arranged at two or more positions at intervals in the rotor axial direction, the first flow path 13 corresponds to each position. Protrusions 21 having different shapes are provided at positions, and the distances between the end faces 16 of the rotor core 2 and the protrusions 21 corresponding to the respective positions are measured, whereby the second flow paths 18 of the rotor core 2 are shafts. It is easy and high whether or not each of the corresponding second refrigerant supply paths 6 is in an appropriate position, that is, whether or not the position of each second flow path 18 is within a predetermined tolerance. It is possible to determine with accuracy.

DESCRIPTION OF SYMBOLS 1 Rotor, 2 Rotor core, 3 Shaft (rotating shaft), 5 1st refrigerant | coolant supply path, 6 2nd refrigerant | coolant supply path, 13 1st flow path, 18 2nd flow path, 21 Protrusion part

Claims (1)

A first flow path extending along the rotor axis and having an end opened; a second flow path extending in the radial direction of the rotor and communicating the first flow path and the refrigerant supply path formed in the rotation shaft; A rotor core refrigerant flow path structure comprising:
The rotor core refrigerant flow path structure, wherein the first flow path has a protruding portion protruding inward of the first flow path at a position corresponding to the second flow path.

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