JP2008312414A - Rotary electric machine and manufacturing method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of the need for a new water-proof structure for tight sealing of a through-hole afterwards, or the need for a centering auxiliary means for another machine, when a rotor and a stator are assembled in a conventional case, in which both ends thereof are supported by a jig for preventing attraction of the rotor to the stator and wherein the through-hole is required for passing through one of the jigs. <P>SOLUTION: The rotary electric machine comprises a bracket for supporting one end of a rotor axis via a primary bearing, which is prepared in a through hole at a center portion; a casing main body, having a cylindrical portion, to which a stator is attached on its inner peripheral face, and a bottom portion, in which a concave portion is formed at its center, for supporting the other end of the rotor axis via the second bearing prepared at the concave portion of the bottom; and a coupling member for combining the casing body and the bracket. The bracket has two or more perforated members, to which two or more guide ribs for guiding the stator are passed through, when the rotor and the stator are assembled in the rotary electric machine. Its manufacturing method is also provided. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine having a plurality of through holes for allowing guide ribs to be inserted into brackets, and a method for manufacturing the same.

As a conventional rotating electric machine for an electric power steering apparatus and a method for manufacturing the rotating electric machine, one in which both ends of a rotor are supported by jigs is shown (for example, see Patent Document 1).
Also, a method of assembling an electric motor that uses at least three centering tongues to achieve a uniform gap width between the rotor and the stator has been proposed (see, for example, Patent Document 2).

JP 2005-168098 A JP 2000-116081 A

  In the method of manufacturing a rotating electrical machine disclosed in Patent Document 1, when assembling a rotor and a stator, both ends are supported by jigs in order to prevent the rotor from adsorbing to the stator. For this reason, a through hole for passing one jig is required, and a new waterproof structure for sealing the through hole later is required. Further, in the method for manufacturing a rotating electrical machine disclosed in Patent Document 2, a centering auxiliary means is required.

In the rotating electrical machine according to the present invention, the rotor having the stator core and the stator winding, the rotor rotating integrally with the rotor shaft, and the first bearing provided in the through hole in the central portion, A bracket for supporting one end of the shaft, a cylindrical portion 20b having the stator attached to the inner peripheral surface thereof, and a bottom portion having a recess formed in the center, and the rotation through the second bearing provided in the recess of the bottom portion A casing main body for supporting the other end of the slave shaft, and a coupler for coupling the casing main body and the bracket;
The bracket is provided with a plurality of through holes through which a plurality of guide ribs for guiding the stator are inserted when the rotor and the stator are assembled.

In the method of manufacturing the rotating electrical machine according to the present invention, the bracket, the first bearing, and the connecting member are attached to the bracket side shaft end portion of the rotor shaft, and the other end portion of the rotor shaft is attached to the second end portion. Assembling process of rotor with two bearings,
A rotor holding step of inserting the guide rib into the through hole of the bracket and bringing the guide rib into contact with the circumferential surface of the rotor and holding the rotor on the holding table by the support;
A step of fitting the stator, which is guided by the guide ribs and lowers the stator to be fitted into the rotor with a predetermined gap;
A stator and rotor assembling step for assembling the stator and the rotor by fitting the second bearing in the concave portion of the bottom of the casing body by the step of fitting the stator;
A casing coupling step for coupling the casing body and the bracket in a state where a predetermined gap is provided between the stator and the rotor;
After the assembly of the stator and the rotor is completed, the assembly is separated by a process of pulling the assembly away from the holding table.

According to the rotating electrical machine of the present invention, at the time of assembling the stator and the rotor, it is possible to prevent the rotor and the stator from being attracted, and improve the reliability of waterproofing by eliminating the through hole at the end of the motor frame. In addition, the equipment can be simplified by eliminating the mechanism for supporting both ends of the rotor.
In addition, the assembly work of the rotor and the stator becomes easy, which is suitable for mass production.

Embodiments of the present invention will be described below with reference to the drawings.
In the drawings, the same reference numerals indicate the same or corresponding parts.

Embodiment 1 FIG.
1 is a side sectional view showing a state before assembling a rotor and a stator of a rotating electrical machine according to Embodiment 1 of the present invention, FIG. 2 (a) is a sectional view taken along the line A-A in FIG. 1 is a cross-sectional view taken along line BB of FIG. 1, FIG. 3 is a side cross-sectional view showing a state where the rotor and the stator of the rotating electric machine according to Embodiment 1 of the present invention are assembled, and FIG. It is a sectional side view which shows the state which the assembly of the rotor and stator of the rotary electric machine in form 1 was finished.

  Next, a rotating electrical machine for an electric power steering apparatus and a main part of the assembling apparatus according to Embodiment 1 will be described with reference to FIGS.

The rotary electric machine includes a stator 2 having a stator core and a stator winding, and a rotor 1 having a magnet 3 and rotating integrally with a rotor shaft 1a, as in a conventional rotary electric machine.
The rotating electrical machine casing portion includes a bracket 6 that supports one end of the rotor shaft 1a via a first bearing 5a provided in the central through hole 6a, and a rotor shaft via a second bearing 5b provided in the recess 20a at the bottom. It is comprised by the bottomed cylindrical casing main body 20 which supports the other end of 1a.
Further, the bottomed cylindrical casing body 20 has an opening on the opposite side to the bottom portion of the cylindrical portion 20b having the stator 2 attached to the inner peripheral surface, the bottom portion having the second bearing 5b attached to the concave portion 20a formed in the center portion. It has a portion 20c.
The bracket 6 is formed by aluminum die casting, and a plurality of through holes 6b (corresponding to the number of guide ribs) through which a plurality of guide ribs 8 to be described later are inserted are provided around a through hole 6a in the center. . Although not shown, the through-hole 6b is cut off from the outside when the rotating electrical machine is attached and has a waterproof structure, so that the through-hole 6b does not require waterproofing.
The bracket 6 and the bottomed cylindrical casing body 20 are integrated by a bracket (not shown) such as a bolt or a nut that closes the opening 20c of the bottomed cylindrical casing body with the bracket 6 and is attached to the coupling hole 6c. Combined with
Reference numeral 7 denotes a holding table 7 which is a main part of the rotating electrical machine assembling apparatus. The holding table 7 holds the rotor 1 in a cantilever state as will be described later when the rotor 1 and the stator 2 are assembled.
A support column 9 is erected at the central portion of the holding table 7, and a guide rib 8 is installed on the same circumference around the support column 9 to guide between the rotor 1 and the stator 2. ing. The guide rib 8 is inserted into the through hole 6 b when assembling the rotor 1 and the stator 2, and ensures a gap between the two so that the stator 2 is not attracted to the rotor 1. Further, the guide rib 8 has elasticity, and a plate-like or rod-like one made of at least three pieces is used.

Further, the bracket-side shaft end surface of the rotor shaft 1b is provided with a centering and center hole 1b for engaging the tip of the support 9 and positioning the rotor 1 when the rotor 1 and the stator 2 are assembled. ing.
Furthermore, a connecting member (boss) 4 having a function of transmitting the rotational torque of the rotor 1 to a driven shaft (not shown) is provided at the bracket side shaft end of the rotor shaft 1a.

Next, the manufacturing method of the said rotary electric machine is demonstrated based on FIGS. 1-4.
(1) First, the rotor 1 is mounted in advance with the bracket 6, the first bearing 5a, and the connecting member 4 on the bracket side shaft end of the rotor shaft 1a, and on the other end of the rotor shaft 1a. Assembling is carried out by mounting the two bearings 5b (rotor assembling step). Although not described, the stator 2 is also separately assembled in advance.
(2) Next, the rotor 1 is placed on the holding table 7 and held in a cantilever state. That is, the guide rib 8 is inserted into the through-hole 6b of the bracket 6, and the connecting member 4 is fitted to the support column 9 while the inserted guide rib 8 is brought into contact with the peripheral surface of the rotor 1, so that the center of the rotor shaft 1a is fitted. The rotor 1 is held on the holding table 7 by engaging the hole 1b with the tip of the support column 9 (refer to FIG. 1).
(3) After the holding of the rotor 1 on the holding base 7 is completed, the stator 2 suspended by a suspension device (not shown) is lowered while being guided by the guide rib 8 from directly above the rotor 1. Then, it is fitted into the rotor 1 with a predetermined gap (stator fitting step).
(4) During the fitting process of the stator 2, the second bearing 5b is fitted into the recess 20a at the bottom of the casing body, and the stator 2 and the rotor 1 are assembled together (an assembly process of the stator and the rotor, (See FIG. 3).
(5) After the assembly of the stator 2 and the rotor 1 is completed, the casing body 20 and the bracket 6 are coupled by a coupling tool (not shown) such as a bolt or a nut (casing coupling step).
(6) Finally, the assembled rotating electrical machine is pulled away from the holding base 7 to complete the assembly of the rotating electrical machine (see the assembly pulling process, see FIG. 4).
As described above, according to this manufacturing method, it is possible to easily assemble a rotating electric machine with a holding base having a simple structure.

It is a sectional side view which shows the state before assembling the rotor and stator of the rotary electric machine in Embodiment 1 of this invention. (A) is sectional drawing of the FIG. 1A-A line, (b) is sectional drawing of the BB line of FIG. It is a sectional side view which shows the state which assembled | attached the rotor and stator of the rotary electric machine in Embodiment 1 by this invention. It is a sectional side view which shows the state which the assembly of the rotor and stator of the rotary electric machine in Embodiment 1 by this invention was completed.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rotor 1a Rotor shaft 1b Center hole of rotor shaft 2 Stator 3 Magnet 4 Connecting member (boss)
5a 1st bearing 5b 2nd bearing 6 Bracket 6a Through-hole 6b through-hole 6b Through-hole 6c Joint hole 7 Holding stand 8 Guide rib (sleeve) 8a Tip end of guide rib 9 Post 20 Casing body 20a Recessed portion of second bearing .

Claims (3)

A stator having a stator core and a stator winding,
A rotor that rotates integrally with the rotor shaft,
A bracket for supporting one end of the rotor shaft via a first bearing provided in a through hole in the central portion;
A casing having a cylindrical part with the stator attached to the inner peripheral surface and a bottom part with a recess formed in the center, and supporting the other end of the rotor shaft via a second bearing provided in the recess of the bottom part Body,
And a coupler for coupling the casing body and the bracket,
The rotating electric machine according to claim 1, wherein the bracket is provided with a plurality of through holes through which a plurality of guide ribs for guiding the stator are inserted when the rotor and the stator are assembled.   The bracket side shaft end surface of the rotor shaft engages with the tip of a support column standing at the center of the holding base for holding the rotor when the rotor and the stator are assembled, and the rotor is 2. The rotating electrical machine according to claim 1, further comprising a centering and center hole for positioning. A method of manufacturing a rotating electrical machine according to claim 1,
An assembly step of a rotor, wherein the bracket, the first bearing, and the connecting member are mounted on a bracket side shaft end of the rotor shaft, and a second bearing is mounted on the other end of the rotor shaft;
A rotor holding step of inserting the guide rib into the through hole of the bracket and bringing the guide rib into contact with the circumferential surface of the rotor and holding the rotor on the holding table by the support;
A step of fitting the stator, which is guided by the guide ribs and lowers the stator to be fitted into the rotor with a predetermined gap;
A stator and rotor assembling step for assembling the stator and the rotor by fitting the second bearing in the recess of the bottom of the casing body by the step of fitting the stator;
A casing coupling step for coupling the casing body and the bracket in a state where a predetermined gap is provided between the stator and the rotor;
After the assembly of the stator and the rotor is completed, the assembly assembly pulling step for separating the assembly assembly from the holding table,
The manufacturing method of the rotary electric machine comprised by the above process.

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