JP5742560B2 - Rotating electrical machine assembly method - Google Patents

Description

  The present invention relates to a rotating electrical machine assembling method, and more particularly, to an assembling method of a rotating electrical machine in which a magnet reaction force is generated between a stator and a rotor.

  A rotating electrical machine is configured to include a stator that is a stator and a rotor that is a rotor, but may have a magnet in one of them. For example, when the rotor has a permanent magnet, the rotor and the stator are attracted by the permanent magnet when the rotor is assembled to the stator. Therefore, assembly is performed with care so that the rotor and the stator do not contact each other.

  For example, in Patent Document 1, as a rotor assembling apparatus, a slide guide that guides a rotor holder so as to be movable in an axial direction with respect to a base so that the rotor does not contact the stator, and a rotor that moves the rotor holder A configuration having a holder moving means is described. Here, for positioning the device case including the stator and the base, a knock pin insertion hole provided in the device case is used.

  Further, in Patent Document 2, as an assembly device for a brushed DC motor using a permanent magnet as a stator, when a stator and a rotor are assembled after magnetizing the permanent magnet, the rotor is attracted by the permanent magnet of the stator, and the armature coil And point out the possibility of damaging the commutator. Here, a jig that holds one end of the rotor, a rotor holder that holds the other end of the rotor, and a stator case that holds the stator case outside the rotor holder can be relatively moved in the direction of the central axis of the rotor. A configuration including a stator holder is disclosed.

JP 2009-148035 A JP 2001-251817 A

  In Patent Documents 1 and 2, a large assembling device is used so that the rotor and the stator do not contact each other. Although it is important for the performance of the rotating electrical machine to align the shaft core between the rotor output shaft and the center position and the bearing center position of the stator, in Patent Documents 1 and 2, the positioning accuracy of the assembly device is The axial center position is determined. Actually, there are variations in the arrangement position of the magnet, the arrangement position of the stator core, etc. Even if the static axial center position is matched, if there is a variation in the magnet reaction force, the rotating electrical machine will operate eccentrically. Become.

  An object of the present invention is to provide a rotating electrical machine assembling method capable of accurately aligning the axis of the central axis of the rotor and the axis of the central axis of the stator when there is a magnet reaction force.

A rotating electrical machine assembling method according to the present invention is a rotating electrical machine assembling method for assembling a case cover integral with a rotor to a case in which the stator is stored for a rotating electrical machine in which a magnet reaction force is generated between the rotor and the stator. A temporary positioning step in which the rotor is temporarily arranged in the rotor arrangement space in the center of the case in which the stator is stored, and the case cover is temporarily positioned with respect to the case; An adjustment step of adjusting the position of the case cover with respect to the case so that the magnet reaction force received is equal, and a fastening step of fastening the case cover to the case at a position where the magnet reaction force in one rotation period is equalized; only including, adjustment step, magnetic by using the flange portion provided concentrically with respect to the central axis of the case cover, measured across the magnet reaction force on the entire circumference of the flange portion was measured As the reaction force is equalized over the entire circumference of the flange portion, and adjusting the position of the case cover with respect to the case.

Further, in the rotary electric machine assembling method according to the present invention, the adjustment step, contacting the probe tip of the displacement meter flange portion, is rotated 360 degrees rotation angle case cover with respect to the case in provisional positioning state, the flange It is preferable that the eccentricity of the case cover with respect to the case is measured over the entire circumference of the portion, and the magnitude of the measured eccentricity indicates the magnitude of the magnet reaction force .

In the rotating electrical machine assembling method according to the present invention, it is preferable that the adjusting step adjusts the magnet reaction force to be uniform over one rotation period by rotating the shaft of the rotor with respect to the case.

  In the rotating electrical machine assembling method according to the present invention, it is preferable that the adjusting step lubricates a rotor shaft support bearing provided in the case cover.

With the above configuration, the rotating electrical machine assembling method allows the rotor cover to be temporarily placed in the rotor placement space in the center of the case in which the stator is stored and positioned temporarily, and in that state, the magnet reaction force received by the case cover from the stator is equal. The position of the case cover with respect to the case is adjusted so that the magnet reaction force in one rotation period becomes equal, and the case cover is fastened to the case. Here, in the adjustment step, the magnet reaction force is measured over the entire circumference of the collar using the collar provided concentrically with the central axis of the case cover, and the measured magnet reaction force is measured by the collar. The position of the case cover with respect to the case is adjusted so as to be uniform over the entire circumference. Therefore, it is possible to accurately adjust the dynamic axis position of the magnetic action between the rotor and the stator in one rotation cycle, instead of matching the static axis position.

Further, in the method with the rotary electric machine assembly, contacting the probe tip of the displacement meter flange portion, it is rotated 360 degrees rotation angle case cover with respect to the case in provisional positioning state, over the entire circumference of the flange portion case Since the degree of eccentricity of the case cover with respect to is measured and the magnitude of the measured degree of eccentricity indicates the magnitude of the magnet reaction force, the axial center position between the rotor and the stator can be accurately matched.

Also, in the rotating electrical machine assembly method, the rotor shaft is rotated with respect to the case, and the adjustment is performed so that the magnet reaction force is uniform over one rotation period. The axial center position can be adjusted with high accuracy.

  Further, in the rotating electrical machine assembly method, the rotor shaft support bearing provided in the case cover is lubricated, so that the assembly can be performed while adjusting efficiently.

It is a flowchart which shows the assembly | attachment procedure in embodiment which concerns on this invention. It is a figure explaining the procedure of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, a configuration in which the rotor has a permanent magnet is described as a rotating electrical machine that generates a magnet reaction force between the rotor and the stator, but this is an example for explanation, and the magnet is provided on the stator side. There may be. Moreover, although the structure which embedded the permanent magnet in the rotor core which laminated | stacked the electromagnetic steel plate is demonstrated as a rotor of a rotary electric machine, this is an illustration and the rotor of a structure of other than this may be sufficient. For example, the structure which attached the permanent magnet to the rotor outer periphery, and the structure where a rotor core has a salient pole may be sufficient. Similarly, although the structure which has a stator core which laminated | stacked the electromagnetic steel plate is demonstrated as a stator, the structure other than this, for example, the structure using the stator core shape | molded using the sintered magnetic powder, etc. may be sufficient. Moreover, about the rotor, although the structure which supports a center axis | shaft and a rotor core with a flange body is demonstrated, support structures other than this may be sufficient. For example, a configuration in which the central shaft is directly attached to the rotor core may be used.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a flowchart showing a procedure of a rotating electrical machine assembly method. FIG. 2 is a diagram for explaining the contents of each procedure. Here, assembling the rotating electrical machine refers to assembling a case cover integrated with a rotor having a magnet into a case in which the stator is stored. Therefore, first, a case in which the stator is stored is prepared in a separate process (S10), and a case cover integrated with the rotor is prepared (S12).

  FIG. 2A is a cross-sectional view showing the case with stator 10 prepared in S10. The case with stator 10 includes a case body 12 having a substantially cylindrical shape, a stator core 14 attached to the inner peripheral surface of the case body 12, and a coil winding wound around the stator core 14.

  The case body 12 is a housing member that accommodates the rotor, and can be obtained by processing an aluminum alloy casting. The case body 12 is provided with a bearing hole 20 that supports the shaft 32 of the rotor of the case cover 30 with rotor described below along the central axis. Moreover, case side attaching parts 22 and 24 for attaching the cover body 42 of the case cover 30 with the rotor are provided. The case side mounting portions 22 and 24 are internally threaded corresponding to the screw portions of the fastening members 50 and 52 used in the fastening process described later. Bolts are used as the fastening members 50 and 52. In addition, it is good also as a structure fastened with a volt | bolt and a nut instead of fastening with a volt | bolt and a female screw.

  Here, the stator is constituted by the stator core 14 and the coil winding. The stator core 14 is a component made of an annular magnetic body having a central hole in which a rotor is disposed at the center. A predetermined number of protrusions called teeth for winding the coil winding are arranged on the stator core 14 along the circumferential direction on the inner peripheral side. Specifically, a laminate of a plurality of electromagnetic steel sheets formed in a predetermined annular shape including teeth is used as the stator core 14. The coil winding is a conductive wire with insulation coating, and is wound around each tooth with a predetermined number of turns. As a result, the tips of the teeth become the stator magnetic poles. 2A shows coil ends 16 and 18 protruding from both ends of the stator core 14 in the axial direction as part of the coil winding.

  FIG. 2B is a cross-sectional view of the rotor case cover 30 prepared in S12. The case cover 30 with a rotor includes a cover body 42, a shaft 32 integrally attached to the cover body 42 via a flange body 34, a rotor core 36, and a permanent magnet 38 embedded in the rotor core 36.

  The rotor includes a shaft 32, a flange body 34, a rotor core 36, and a permanent magnet 38. The shaft 32 is an output shaft extending along the central axis of the rotor. The flange body 34 is an annular member having a center hole for supporting the shaft 32 at the center, a holding portion for holding the rotor core 36 on the outer peripheral side, and connecting between them by a flange. The flange body 34 is provided with a bearing portion 40 as a rotor shaft support bearing that rotatably supports the shaft 32. As the bearing portion 40, a ball bearing can be used. Of course, an appropriate bearing material other than the ball bearing may be used.

  The rotor core 36 is a member made of an annular magnetic body, and is held by the flange body 34 on the inner peripheral side thereof. In the rotor core 36, magnet insertion holes for arranging a predetermined number of permanent magnets 38 in a predetermined arrangement relationship are formed along the axial direction. As the rotor core 36, a laminate in which a plurality of electromagnetic steel plates including a magnet insertion hole and formed into a predetermined annular shape are stacked is used.

The permanent magnet 38 is a magnet that is embedded in a magnet insertion hole provided near the outer peripheral side of the rotor core 36 to form a rotor magnetic pole. When the case cover with rotor 30 is assembled to the case with stator 10, the outer peripheral side of the rotor core 36 faces the inner peripheral side of the stator core 14, and the rotor magnetic pole and the stator magnetic pole face each other in a predetermined arrangement relationship.
The cover body 42 is a substantially circular member and is integrally coupled to the flange body 34 so that the central axis of the shaft 32 comes to the center position. Cover side mounting portions 46 and 48 are provided on the outer peripheral side of the cover body 42 corresponding to the case side mounting portions 22 and 24 in the case body 12 of the case 10 with the stator. The cover-side attachment portions 46 and 48 are provided with attachment holes that are smaller than the heads of the fastening members 50 and 52 and larger than the screw portions.

  A flange portion 44 is provided on the inner peripheral side of the cover body 42. When the case cover 30 with the rotor is combined with the case 10 with the stator, the flange portion 44 is a magnet generated in the cover body 42 corresponding to the attractive force between the permanent magnet 38 of the rotor and the stator core 14 that is a magnetic body. Used to measure reaction force. The flange portion 44 is disposed concentrically with respect to the center position of the cover body 42. A plurality of the flange portions 44 may be arranged concentrically, but may be concentric annular protrusions. By doing so, it becomes easy to measure the magnet reaction force in a circumferential shape.

  Returning to FIG. 1 again, when the case 10 with the stator and the case cover 30 with the rotor are prepared, next, temporary positioning is performed (S14). That is, the rotor having the permanent magnet 38 is temporarily arranged in the rotor arrangement space at the center of the case 10 with stator, and the case cover 30 with rotor is temporarily positioned with respect to the case 10 with stator. As temporary positioning, the case side attachment portions 22 and 24 of the case body 12 and the cover side attachment portions 46 and 48 of the cover body 42 are loosened by using bolts that are fastening members 50 and 52. Stopping loosely means holding the cover body 42 to the case body 12 to such an extent that the cover body 42 can be moved for adjustment.

  FIG. 2C shows a state where provisional positioning has been performed. That is, on the paper surface of FIG. 2, the shaft 32 side of the case cover 30 with the rotor is inserted into the lower side from the opening on the upper side of the case 10 with the stator, and the tip portion of the shaft 32 is attached to the stator. Fit into the bearing hole 20 of the case 10. In this state, the central axis direction of the shaft 32 and the central axis direction of the case body 12 are almost coaxial. Almost coaxial means that the outer shape accuracy of the stator core 14, the outer shape accuracy of the rotor core 36, the accuracy of the arrangement relationship between the stator core 14 and the bearing hole 20, the arrangement accuracy of the rotor core 36 and the shaft 32, and the arrangement of the permanent magnet 38 and the shaft 32. This is because there are variations in accuracy and the like. In particular, an attractive force is generated between the permanent magnet 38 and the stator core 14. However, since the attractive force is not uniform in the circumferential direction, the central axis direction of the shaft 32 and the central axis direction of the case body 12 are different. As a result, it does not become a constant coaxial for one rotation period.

  When the tip of the shaft 32 is fitted into the bearing hole 20, the upper surface of the case with stator 10 and the lower surface of the case cover 30 with rotor face each other, and the lower surface of the cover body 42 is supported by the upper surface of the case body 12. In this state, the cover body 42 is appropriately rotated with respect to the case body 12, and the positions of the attachment holes that are the cover side attachment portions 46 and 48 of the cover body 42 are determined by the case side attachment portions 22 and 24 of the case body 12. Align with a female screw. Then, the fastening members 50 and 52 are used to stop loosely. This state is a temporary positioning state. In addition, illustration of the fastening members 50 and 52 used for temporary positioning is abbreviate | omitted in FIG.2 (c).

  In this temporary positioning state, as shown in FIG. 1, the bearing portion 40 of the case cover 30 with the rotor is lubricated (S16). Specifically, an appropriate amount of lubricating oil is supplied to the bearing portion 40 via a lubricating oil circulation path (not shown). Then, the rotor is rotated (S18). In the rotor rotation, as shown by a rotation arrow in FIG. At this time, since the bearing portion 40 is lubricated, the frictional force is small even when the shaft 32 is rotated, and the positional relationship between the cover body 42 and the case body 12 hardly changes.

  And the magnet reaction force over one rotation period is measured using the collar part 44 (S20). When the flange 44 is disposed concentrically with respect to the central axis of the case cover 30 with the rotor, the magnet reaction force may be measured over the entire circumference of the flange 44. For the magnet reaction force, an appropriate displacement meter can be used. For example, the probe tip of the dial gauge is brought into contact with the flange portion 44, and the shaft 32 is rotated 360 degrees with respect to the case body 12 at a rotation angle in the temporarily positioned state. When the shaft 32 rotates, the rotor core 36 also rotates. Therefore, the eccentricity of the rotor core 36 with respect to the stator core 14 can be determined from the measured value of the dial gauge at that time. This eccentricity indicates the magnitude of the magnet reaction force received by the rotor corresponding to the attractive force between the permanent magnet 38 and the stator core 14 in the temporary positioning state.

  Therefore, the position of the cover body 42 with respect to the case body 12 is adjusted so that the magnitude of the measured magnet reaction force is uniform over the entire circumference of the flange portion 44. In the above example, the position of the cover body 42 is shifted so that the measured value of the dial gauge becomes a constant value while rotating the shaft 32. In this way, adjustment is performed so that the magnet reaction force becomes uniform over one rotation period of the shaft 32 (S22).

  As a result of the adjustment, when it is confirmed that the magnet reaction force is uniform over one rotation period of the shaft 32, the positional relationship between the cover body 42 and the case body 12 at that time is fixed. Specifically, the cover member 42 and the case body 12 are securely fastened by the fastening members 50 and 52 so that the positional relationship is not shifted (S24). To illustrate this, the fastening members 50 and 52 are shown in FIG.

  In this way, a jig as a positioning reference can be used without measuring the axial center position of the case with stator 10 and measuring the axial center position of the case cover with rotor 30 in advance or in place of these measurements. Without using it, the axial center between the central axis of the rotor and the central axis of the stator can be accurately aligned. In addition, since the dynamic axial center can be aligned so that the magnet reaction force when the rotor rotates is equal for one rotation period, instead of aligning the static axis, the magnet in one rotation period The reaction force bias can be zero. As a result, the operation of the rotating electrical machine can be stabilized, the eccentricity during operation can be suppressed, and the generation of noise due to the eccentricity can be reduced. Further, since the influence of variations in the shape of the permanent magnet, the stator core, and the rotor core can be eliminated, the assemblability is improved.

  Further, in the structure in which the refrigerant is passed through the center of the shaft 32, it is necessary to match the axis of the shaft 32 with the axis of the refrigerant circulation path provided in the case body 12, but according to the above configuration, the shaft 32 rotates. In this case, there is no risk of eccentricity caused by the magnet reaction force, and the refrigerant can be circulated effectively.

  The method of assembling a rotating electrical machine according to the present invention can be used for a rotating electrical machine in which a rotor having a permanent magnet is assembled to a stator.

  10 Case with stator, 12 Case body, 14 Stator core, 16, 18 Coil end, 20 Bearing hole, 22, 24 Case side mounting part, 30 Case cover with rotor, 32 Shaft, 34 Flange body, 36 Rotor core, 38 Permanent magnet, 40 bearing part, 42 cover body, 44 collar part, 46, 48 cover side attaching part, 50, 52 fastening member.

Claims (4)

For a rotating electrical machine in which a magnet reaction force is generated between a rotor and a stator, a rotating electrical machine assembly method in which a case cover integrated with the rotor is assembled to a case in which the stator is stored,
A temporary positioning step in which a rotor is temporarily arranged in a rotor arrangement space in a central portion of a case in which a stator is stored, and a case cover is temporarily positioned with respect to the case;
An adjustment step of adjusting the position of the case cover relative to the case so that the magnet reaction force received by the case cover from the stator is equal in the temporarily positioned state;
A fastening process for fastening the case cover to the case at a position where the magnet reaction force in one rotation period becomes equal;
Only including,
The adjustment process
Using the collar part concentrically provided with respect to the center axis of the case cover, the magnet reaction force is measured over the entire circumference of the collar part, and the measured magnet reaction force is evenly distributed over the entire circumference of the collar part. The rotating electrical machine assembling method characterized by adjusting the position of the case cover with respect to the case . In the rotating electrical machine assembly method according to claim 1,
The adjustment process
The tip of the probe of the displacement meter is brought into contact with the buttocks, the case cover is rotated 360 degrees with respect to the case in a temporary positioning state, and the eccentricity of the case cover with respect to the case is measured over the entire circumference of the buttocks. The rotating electrical machine assembly method, wherein the measured degree of eccentricity indicates the magnitude of the magnet reaction force . In the rotating electrical machine assembly method according to claim 1 or 2,
The adjustment process
A rotating electrical machine assembling method characterized in that adjustment is performed by rotating a shaft of a rotor with respect to a case so that a magnet reaction force is uniform over one rotation period. In the rotating electrical machine assembly method according to any one of claims 1 to 3 ,
The adjustment process
A method of assembling a rotating electrical machine, comprising lubricating a rotor shaft support bearing provided on a case cover.

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