JP2005312241A - Assembling method of motor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an assembling method of a motor by which a stator core and a rotor (shaft) can be assembled with high accuracy to a housing having an opening at only one side with respect to a rotating shaft of the motor. <P>SOLUTION: The assembling method of the motor is characterized in that: an insertion auxiliary jig having an inner periphery that is almost the same with the inner periphery of the housing is arranged outside the opening side of the housing so as to be coaxial with respect to the central axis of the housing at the time of the insertion of the stator core, while holding both ends of the rotor after inserting the rotor having a permanent magnet into the housing; and the stator core is inserted into the housing with the insertion jig as a guide. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

 The present invention relates to a method for assembling an electric motor used for a prime mover such as a vehicle.

 Conventionally, a method of manufacturing an electric motor (motor) by inserting a rotor and a stator core into a housing having openings at both ends has been developed. In such a method, when assembling an electric motor including a permanent magnet, the permanent magnet generates an attractive force. Therefore, when the rotor or the stator core is inserted, both of them come into contact with each other and the electric motor cannot be assembled with high accuracy. there were.

An electric motor disclosed in Japanese Patent Laid-Open No. 6-284647 is an electric motor in which a rotating hub assembly (housing) includes a permanent magnet and the housing functions as a rotor. In this electric motor assembling method, the permanent magnet and the stator coil (center shaft) are attracted by magnetic force and the housing and the center axis of the stator coil (center shaft) are assembled eccentrically (bonded). The purpose is to prevent. While holding both ends of the stator coil (center shaft) with the lower jig on the equipment and the alignment piston, the rotating hub assembly (housing) gripped with the upper jig on the equipment is inserted into the stator coil, so that the rotating hub The assembly accuracy of the assembly and the stator coil is improved.
JP-A-6-284647

 In recent years, an electric motor used in a hybrid vehicle or an electric vehicle is often disposed adjacent to a transmission, and the housing of the electric motor is often formed integrally with the housing of the transmission. In such a case, the housing of the electric motor and the housing of the transmission are integrally formed by casting to ensure the rigidity of the bearing and reduce the cost. On the other hand, the both ends are not open. That is, both ends of the rotor or motor shaft cannot be inserted into the stator core while being held by a jig or the like. Further, in the case where it is arranged adjacent to the transmission, there are some which have a gear at the tip of the rotor or the shaft of the rotor, and it is necessary to assemble the electric motor with higher accuracy. Therefore, it is a technical object of the present invention to provide a method for assembling an electric motor in which a stator core and a rotor (shaft) can be accurately assembled with respect to a housing having an opening only on one side with respect to the rotating shaft of the electric motor. .

 In order to solve the above-mentioned problem, the technical means taken in claim 1 is that, after inserting a rotor having a permanent magnet into a housing, the housing is held at the time of inserting the stator core while holding both ends of the rotor. An insertion auxiliary jig having substantially the same inner circumference as the inner circumference of the housing is disposed coaxially with the central axis of the housing and outside the opening side of the housing, and the stator core is inserted into the housing using the insertion jig as a guide. This is a feature of assembling the electric motor.

 In order to solve the above-mentioned problem, the technical means taken in claim 2 in addition to the technical means of claim 1 is that an inner diameter larger than an outer diameter of the rotor and an inner diameter of the stator core are inserted before the stator core is inserted. After inserting a cylindrical non-magnetic spacer having a small outer diameter, the stator core is inserted, and the motor is assembled by removing the spacer.

 In order to solve the above-mentioned problem, the technical means taken in claim 3 is to insert the stator core into the housing, then fix the rotor coaxially with respect to the central axis of the housing, and insert the rotor into the housing. This is an electric motor assembling method.

 In order to solve the above-mentioned problem, the technical means taken in claim 4 is to assemble an electric motor characterized by inserting a rotor and a stator core into a housing and then inserting a permanent magnet into a slit provided in the rotor. It is a method.

 According to the technical means of claim 1, after inserting the rotor having the permanent magnet into the housing, the stator core is inserted while holding one end of the bearing at the both ends of the rotor and the other end by the jig. Therefore, a holding force that opposes the magnetic force acting between the rotor and the stator core can be obtained, and an electric motor assembling method that realizes the coaxiality of the rotor and the stator core with high accuracy can be provided. Further, since the stator core can be inserted into the housing using the insertion assisting jig as a guide, positioning at the time of inserting the stator is facilitated.

 According to the technical means of the second aspect, in addition to the effect of the first aspect, the spacer is inserted even after the rotor is inserted, so that even if the magnetic force acts between the rotor and the stator core and the rotor is attracted, the spacer As a result, the center misalignment is suppressed, so that the center of the core can be easily aligned, and a motor assembling method that realizes the coaxiality of the rotor and the stator core with high accuracy can be provided.

 According to the technical means of claim 3, after inserting the stator core into the housing, the rotor can be securely held on one side by bolt holes and bolts provided at the ends and inserted into the center of the stator core. It is possible to provide an electric motor assembling method that realizes the coaxiality of the stator core with high accuracy.

 According to the technical means described in claim 4, the rotor and the stator core that do not generate magnetic force are inserted into the housing while maintaining a highly accurate coaxiality, and then the permanent magnet is inserted into the slit of the rotor. It is possible to provide a method for assembling an electric motor that achieves a high degree of accuracy.

 Hereinafter, embodiments embodying the present invention will be described with reference to FIGS.

FIG. 1 is a cross-sectional view showing an embodiment of the first embodiment of the present invention.

 In this embodiment, before inserting the stator core 4 into the housing 7, the rotor 1 is assembled in advance by inserting only the insertion side end of the rotor 1 into the motor body. Since the housing 7 is separated from the rotor 1 and the material thereof is usually made of aluminum, which is a nonmagnetic material, the rotor 1 can be assembled without any trouble due to the magnetic attractive force. Thereafter, the end opposite to the insertion side of the rotor 1 is held by a holding device 2b prepared in advance so as not to move by magnetic attraction.

Next, the stator core 4 is inserted into the housing 7. The stator core 4 is previously passed through the rotor end holding device 2b in the center hole. Since the outer periphery of the stator core 4 is constrained by the housing 7, the stator core 4 does not move in any direction due to the attractive force of the magnet.

Furthermore, an insertion auxiliary jig 7a having substantially the same dimensions as the inner periphery of the housing 7 (the portion in contact with the outer periphery of the stator core) is prepared and arranged on the upper portion of the housing 7, and the stator can be inserted more smoothly by assisting the introduction of the stator core 4. This jig does not have to be on the entire circumference, and it is sufficient if the outer circumference of about half of the entire circumference is covered in a divided configuration.

FIG. 2 is an explanatory diagram of what has the function of assisting the first embodiment. Assuming that adsorption between the rotor 1 and the stator core 4 cannot be prevented, a nonmagnetic material (an inner diameter larger than the outer diameter of the rotor core 1b and the stator core 4 having a thickness slightly smaller than the gap distance from the stator core 4a on the outer periphery of the rotor core 1b) If the spacer 8 made of a cylindrical spacer having an outer diameter smaller than the inner diameter of the rotor is disposed and the spacer 8 can be extracted after the rotor 1 is inserted, the rotor core 1b is adsorbed to the stator core 4a. However, there is an advantage that the correction can be performed relatively easily. Examples of the nonmagnetic material constituting the spacer 8 include metals and resins such as copper and aluminum. Further, according to this method, since the rotor inclination angle due to the magnet attractive force after the rotor insertion / removal of the rotor end holding device can be suppressed, the distance between the case end and the rotor bearing end for adjusting the clearance in the axial direction can be reduced. There is also an advantage that dimension measurement can be performed more accurately.

FIG. 3 is a cross-sectional view showing an embodiment of the second embodiment of the present invention.

In FIG. 3, the end portion opposite to the insertion side end of the rotor 1 is first fixed by the fixing device 9. This fixing requires a certain fixing method so that the rotor does not run out. For example, a method of making a bolt hole in the rotor shaft 1a and fixing the bolt, or providing a part having a high outer diameter dimension on a part of the shaft. A method of sandwiching the portion is used. The fixing device 9 is configured so that it can be loosened and removed after inserting the rotor. After being fixed by the fixing means, the rotor 1 is moved until it is inserted into the housing 7. After completion of rotor insertion, remove the fixing.

In this case, when the rotor tip is inserted while fitting the gear 11 or when the bearing attached to the rotor is inserted into the housing 7, the rotor 1 is rotated by rotating the fixing device. It is desirable to be able to do so.

In addition, if a spacer made of a nonmagnetic material is disposed between the rotor core 1b and the stator core 4a as in the case of the first embodiment, the same effect as in the first embodiment can be obtained.

FIG. 4 is a cross-sectional view showing an embodiment 3 of the present invention.

Normally, a medium to large motor or a motor that rotates at a high speed requires a rotor balance correction process before the rotor is mounted. In this embodiment, a small motor or a low-speed motor that does not require such balance correction. Is applicable.

In the present embodiment, the adsorption between the stator core 4 and the rotor 1 is caused by the permanent magnet 3 disposed in the rotor 1, and the permanent magnet 3 is inserted later.

First, rotor components other than magnets, for example, the rotor core 1b and the end plate 10 are attached to the rotor shaft 1a, and then the rotor 1 is inserted and attached to the motor body in this state. Since the permanent magnet 3 is not attached to the rotor 1, the rotor 1 can be attached to the motor without any attractive force acting between the stator core 4a.

Next, the permanent magnet 3 is inserted from the rotor 1 end. At that time, when the rotor inclination is prevented by the attractive force between the rotor 1 and the stator core 4, the rotor end is held by the holding device 2 b as in the first embodiment. Finally, a member that acts as a lid is attached to the magnet insertion hole (slit) 11 of the end plate 10 as necessary. When the rotor inclination is prevented by the attractive force between the rotor 1 and the stator core 4, the rotor end is held by the holding device 2b as in the first embodiment. Finally, a member that acts as a lid is attached to the magnet insertion hole 11 of the end plate 10 as necessary.

Sectional drawing which shows the aspect of Example 1 of this invention. Sectional drawing of the principal part enlarged view of Example 1 of this invention. Sectional drawing which shows the aspect of Example 2 of this invention. Sectional drawing which shows the aspect of Example 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor 1a Rotor shaft 1b Rotor core 2a Holding device 2b Holding device 3 Permanent magnet 7 Housing 7a Insertion auxiliary jig 8 Spacer 9 Fixing device 11 Magnet insertion hole (slit)

Claims (4)

After inserting a rotor having a permanent magnet into the housing, an insertion auxiliary jig having an inner periphery substantially the same as the inner periphery of the housing is inserted into the center of the housing while the stator core is inserted while holding both ends of the rotor. A method for assembling an electric motor, wherein the motor is disposed coaxially with an axis and outside the opening side of the housing, and the stator core is inserted into the housing using the insertion jig as a guide. Before inserting the stator core, after inserting a cylindrical non-magnetic spacer having an inner diameter larger than the outer diameter of the rotor and smaller than the inner diameter of the stator core, the stator core is inserted and the spacer is removed. The method of assembling an electric motor according to claim 1. A method for assembling an electric motor, comprising: inserting a stator core into a housing; fixing a rotor coaxially with a central axis of the housing; and inserting the rotor into the housing. A method for assembling an electric motor, comprising: inserting a rotor and a stator core into a housing; and inserting a permanent magnet into a slit provided in the rotor.

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