JP2010273411A - Rotary electric machine and method of manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of accurately adjusting misalignment by a simple configuration without an increase in the number of parts when a bearing is fixed in a motor case. <P>SOLUTION: The rotary electric machine includes a bottomed cylindrical frame 3, a stator 1 fixed in the frame 3, a bottomed cylindrical bracket 4 whose opening is placed over the stator 1 and which is coupled with the frame 3, and a rotor 2 that is placed with a gap against the inner circumferential part of the stator 1, fixed on a rotating shaft 26 rotatably supported in the center of the bottom of the frame 3 and the center of the bottom of the bracket 4, and rotated coaxially with the central axis of the stator 1. Part of the stator 1 is protruded from the opening in the frame 3. Between the outer circumferential part of the stator 1 protruded from the opening in the frame 3 and the inner circumferential part of the bracket 4, there is provided a gap 9 for moving the bracket 4 in the radial direction to correct misalignment of the rotating shaft 26. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a small rotating electrical machine that requires quietness during operation, such as a fan motor.

  In a conventional rotating electrical machine, an armature in which a rotating shaft is disposed, a motor case in which the armature is accommodated, a bearing that supports the rotating shaft, and a bearing holding portion that is disposed in the motor case and holds the bearing In order to correct the misalignment between the shaft center of the rotating shaft and the shaft center of the bearing, the bearing holding portion is disposed at a position eccentric from the center of the bearing cover. The bearing cover is adjusted to a predetermined rotation angle with the central axis of the motor case as a reference axis, and the bearing cover is caulked and fixed to the motor case (see, for example, Patent Document 1).

JP 2003-189531 (pages 3 to 4, FIGS. 1 to 6)

  In the rotating electrical machine as described in Patent Document 1, since the motor case and the bearing cover are separated, there is a problem in that the number of parts is increased and the manufacturing cost is increased.

  In addition, there is a problem that a new center misalignment occurs due to rotation of the bearing cover or deformation of the motor case by a large force applied when the bearing cover is caulked and fixed to the motor case.

  The present invention has been made to solve the above-described problems, and adjusts the misalignment at the time of fixing the bearing to the motor case with a simple configuration without increasing the number of parts. The purpose is to obtain a rotating electrical machine that can be used.

A method of manufacturing a rotating electrical machine according to the present invention includes a stator fixed in a cylindrical frame having a bottom portion, and a cylindrical shape having a bottom portion. An opening covers the stator, and the stator is fixed to the frame. The bracket is disposed through a gap between the bracket and the inner periphery of the stator, and is fixed to a rotating shaft that is rotatably supported via a bearing at the center of the bottom of the frame and the center of the bottom of the bracket. In a method for manufacturing a rotating electrical machine having a rotor core between the bearings and a rotor that rotates coaxially with the center axis of the stator,
The stator is fixed to the frame, the rotor is disposed in the stator, and the bracket is placed on the stator.
Measure the amount of misalignment of the rotating shaft,
The bracket is moved in the radial direction by a value obtained by multiplying the measured amount of misalignment by the leverage shown in the following formula (1) to fix the misalignment and fix the frame and the bracket. is there.
Leverage ratio = (distance between frame side bearing and bracket side axial end face of rotor core) / (distance between frame side bearing and bracket side bearing) ... Formula (1)

A rotating electrical machine according to the present invention is a cylindrical frame having a bottom portion, a stator fixed in the frame, and a cylindrical shape having a bottom portion. The stator covers an opening and is fixed to the frame. A bracket, and an inner peripheral portion of the stator, and a clearance, and is fixed to a rotating shaft that is rotatably supported at the center of the bottom of the frame and the center of the bottom of the bracket. In a rotating electrical machine having a rotor that rotates coaxially with a central axis,
A part of the stator protrudes from the opening of the frame;
A gap is provided between the outer peripheral portion of the stator protruding from the opening of the frame and the inner peripheral portion of the bracket so as to correct the misalignment of the rotating shaft by moving the bracket in the radial direction. .

According to the method for manufacturing a rotating electrical machine according to the present invention, a stator fixed in a cylindrical frame having a bottom, and a cylinder having a bottom, the opening covers the stator, and the stator is fixed to the frame. Fixed to a rotating shaft that is supported via a bearing at the center of the bottom of the frame and the center of the bottom of the bracket. In the method of manufacturing a rotating electrical machine having a rotor core between the bearings and a rotor that rotates coaxially with the center axis of the stator,
The stator is fixed to the frame, the rotor is disposed in the stator, and the bracket is placed on the stator.
Measure the amount of misalignment of the rotating shaft,
The bracket is moved in the radial direction by a value obtained by multiplying the measured amount of misalignment by the leverage shown in the following formula (1) to fix the misalignment and fix the frame and the bracket. Therefore, it is possible to correct the misalignment of the rotor by moving the bracket in an appropriate amount in the radial direction without adding new parts, and the manufacturing cost of the rotating electrical machine can be reduced.
Leverage ratio = (distance between frame side bearing and bracket side axial end face of rotor core) / (distance between frame side bearing and bracket side bearing) ... Formula (1)

According to the rotating electrical machine of the present invention, a cylindrical frame having a bottom portion, a stator fixed in the frame, and a cylindrical shape having a bottom portion, the opening covers the stator, and the frame is attached to the frame. The fixed bracket and the inner peripheral portion of the stator are disposed through a gap, and are fixed to a rotating shaft that is rotatably supported at the center of the bottom of the frame and the center of the bottom of the bracket. In a rotating electrical machine having a rotor that rotates coaxially with the center axis of the child,
A part of the stator protrudes from the opening of the frame;
A gap is provided between the outer peripheral portion of the stator protruding from the opening of the frame and the inner peripheral portion of the bracket so as to correct the misalignment of the rotating shaft by moving the bracket in the radial direction. Therefore, it is possible to correct the misalignment of the rotor by moving the bracket in an appropriate amount in the radial direction without adding new parts, and the manufacturing cost of the rotating electrical machine can be reduced.

It is sectional drawing which shows Embodiment 1 of the rotary electric machine which concerns on this invention. It is a perspective view which shows Embodiment 1 of the rotary electric machine which concerns on this invention. It is a perspective view which shows the state which removed the bracket in FIG. It is a perspective view which shows Embodiment 2 of the rotary electric machine which concerns on this invention.

Embodiment 1 FIG.
FIG. 1 is a cross-sectional view showing a first embodiment of the rotating electrical machine according to the present invention, FIG. 2 is a perspective view showing the first embodiment of the rotating electrical machine according to the present invention, and FIG. It is a perspective view which shows the state which carried out. Here, a small induction machine will be described as an example based on FIG. 1, FIG. 2 and FIG.

  The rotating electrical machine according to the first embodiment has a cylindrical frame 3 having a bottom portion, a stator 1 fixed in the frame 3, a cylindrical shape having a bottom portion, and an opening portion covers the stator 1, The bracket 4 is coupled to the bracket 3 to form a space, and the rotation is supported by the center of the bottom of the frame 3 and the center of the bottom of the bracket 4 through a gap between the inner periphery of the stator 1 and the gap. A rotating electrical machine that is fixed to a shaft 26 and includes a rotor 2 that rotates coaxially with the central axis of the stator 1, and a part of the stator 1 protrudes from an opening of the frame 3. A gap 9 having a predetermined dimension is provided between the outer peripheral portion of the stator 1 projecting from the inner peripheral portion of the bracket 4.

  The stator 1 includes a stator core 11, a stator winding 15 wound around the stator core 11, and an insulator 14 that insulates the stator core 11 from the stator winding 15. The stator core 11 includes an annular stator core yoke portion 12 and stator core teeth 13 that protrude in the radial direction from the stator core yoke portion 12 and are disposed at predetermined intervals in the circumferential direction. The winding 15 is wound around the stator core tooth portion 13 via an insulator 14. The stator 1 is pressed into a part of the opening of a substantially cylindrical frame 3 having an opening and a bottom so as to protrude from the opening and is fixed to the frame 3.

  The rotor 2 includes a rotor core 21, a conductor 25, a rotating shaft 26, and bearings 27a and 27b. The rotor core 21 is composed of an annular rotor core yoke portion 22 and a rotor core tooth portion 23 that protrudes in the radial direction from the rotor core yoke portion 22 and is disposed at predetermined intervals in the circumferential direction. The conductor 25 to be formed is cast into a groove portion between the rotor core teeth 12 by an aluminum die casting method. A rotating shaft 26 is fixed through the center of the rotor core 21, and a pair of bearings 27 a and 27 b sandwich the rotor core 21 at a position approximately the same distance from the end surface of the rotor core 21 on the rotating shaft 26. So that it is fixed. The outer periphery of the bearing 27 a is fitted into a concave first housing 5 a provided at the center of the bottom of the frame 3.

  The bracket 4 has a substantially cylindrical shape having an opening and a bottom similarly to the frame 3, and the opening of the bracket 4 is fitted through the outer periphery of the stator 1 protruding from the opening of the frame 3 and the gap 9, The opening of the frame 3 and the opening of the bracket 4 are joined together to form a space. The outer periphery of the bearing 27 b is fitted in a concave second housing 5 b provided at the center of the bottom of the bracket 4. The bearings 27a and 27b are rotatably fitted in the first housing 5a and the second housing 5b, respectively, and the rotor 2 rotates coaxially with the central axis of the stator 1.

  The amount of the gap 9 is set to be approximately equal to the amount obtained by multiplying the amount of the gap between the outer periphery of the rotor 2 and the inner periphery of the stator 1 by the [leverage ratio]. However, [leverage ratio] = (distance between the bearing 27a on the frame 3 side and the end surface on the bracket 4 side of the rotor core 11) ÷ (distance between the bearing 27a on the frame 3 side and the bearing 27b on the bracket 4 side). .

  Disc-shaped flange portions 6a and 6b are provided on the opening side end surfaces of the frame 3 and the bracket 4, and three ear portions 7 projecting radially from the outer periphery of the flange portions 6a and 6b are provided at substantially equal intervals. In addition, a screw hole 7a for attaching the rotating electrical machine to a housing or the like is formed in the ear portion 7. After the completion of the adjustment work, which will be described later, the flange portions 6a and 6b are fixed to each other by laser welding the end surfaces of the butted surfaces with a welded portion 8 near the base of the ear portion 7.

Hereinafter, a method for assembling the rotating shaft of the rotating electrical machine having such a configuration will be described.
First, the rotating electrical machine is temporarily assembled. First, the stator 1 in which the winding of the stator winding 15 has been completed is partly projected into the frame 3 and press-fitted. Next, the rotor 2 is inserted into the stator 1, and the bearing 27 a on the frame 3 side of the rotor 2 is fitted into the first housing 5 a of the frame 3. Further, the bracket 4 is placed on the stator 1, and the bearing 27 b on the bracket 4 side of the rotor 2 is fitted into the second housing 5 b of the bracket 4.

  Subsequently, the misalignment is corrected. First, the stator winding 15 is energized with the frame 3 and the bracket 4 fixed, and the rotor 2 is rotated. Next, the misalignment amount of the rotating shaft 26 is measured using misalignment detection means. As the misalignment detection means, for example, the misalignment amount is obtained by measuring vibration / noise generated by the rotating electrical machine, harmonic distortion of the winding current, unbalance of the winding voltage, and the like. Further, the frame 3 and the bracket 4 are moved relative to each other so as to correct the measured misalignment amount. At this time, the misalignment is corrected by moving the bearing 27b on the bracket 4 side in the radial direction by the amount of the misalignment multiplied by the [leverage ratio] with the bearing 27a on the frame 3 side as a fulcrum. By setting the amount of the gap 9 between the outer periphery of the stator 1 and the inner periphery of the bracket 4 as described above, the amount of movement of the bracket 4 when correcting the misalignment by moving the bracket 4 in the radial direction. However, the outer periphery of the stator is limited so that the rotor 2 does not interfere with the stator 1.

  Finally, the frame 3 and the bracket 4 are fixed to each other. First, the frame 3 and the bracket 4 are held in a state where the misalignment correction is completed. Next, the frame 3 and the bracket 4 are welded by sequentially irradiating the welded portion 8 with a YAG laser, with the welded portion 8 being the end surface of the attachment surface of the flange portions 6a and 6b and the vicinity of the base of the ear portion 7. To do. If the irradiation position and output of the YAG laser are appropriately adjusted, distortion caused by welding can be reduced to a negligible level.

  Here, the reason why the vicinity of the root of the ear portion 7 is the welded portion 8 is as follows. When the frame 3 and the bracket 4 are molded by deep drawing, the ear portion 7 often warps in a direction perpendicular to the mating surfaces of the flange portions 6a and 6b. Therefore, when the frame 3 and the bracket 4 are brought into contact with each other, a gap may be formed between the ear portions 7. In this case, when the rotating electrical machine is screwed to the housing or the like, the bracket 4 is deformed and the misalignment occurs as the gap between the ears 7 is closed. In order to suppress this, it is effective to constrain the portion close to the screw hole 7 a, and therefore the root of the ear portion 7 is appropriate as the welded portion 8.

  According to the configuration of the first embodiment as described above, a part of the stator 1 protrudes from the opening of the frame 3, and the outer periphery of the stator protruding from the opening of the frame 3 and the inside of the bracket Since a gap 9 of a predetermined dimension is provided between the peripheral portion and the center portion of the rotor 2 can be corrected by moving the bracket 4 by an appropriate amount in the radial direction without adding new parts, The manufacturing cost of the rotating electrical machine can be reduced.

  Further, by using laser welding to fix the frame 3 and the bracket 4, distortion caused by welding can be reduced to a negligible level, so that misalignment during fixing by welding can be suppressed, and highly accurate misalignment correction becomes possible. The quality of the rotating electrical machine can be improved.

  In addition, although the example of the induction machine was shown here, the application range of this invention is not restricted to an induction machine, It can apply to a general rotary electric machine.

Embodiment 2. FIG.
FIG. 4 is a perspective view showing Embodiment 2 of the rotating electrical machine according to the present invention.
In the second embodiment, a sealing agent for preventing moisture ingress is applied to the abutting surface between the flange portion 6b of the frame 3 and the flange portion 6a of the bracket 4, and the tips of the ear portions 7 of the flange portions 6a and 6b are welded. Eight. By not applying the sealing agent to the ear portion 7, it is possible to prevent the laser welding from becoming unstable due to the sealing agent protruding from the flange portions 6a and 6b. In this case, a step of eliminating the gap by pressing the ear portions 7 together may be added before laser welding.

  According to the configuration of the second embodiment, the sealant applied to the butt surfaces of the flange portions 6a and 6b is resistant to moisture and reduces misalignment when the rotating electrical machine is screwed to the housing or the like. be able to.

1 stator, 2 rotor, 3 frame, 4 bracket, 5a first housing,
5b 2nd housing, 6a, 6b flange part, 7 ear | edge part, 8 laser welding location,
12 stator core yoke, 13 stator core teeth, 14 insulator,
15 stator winding, 21 rotor core, 22 rotor core yoke,
23 Rotor core tooth part, 25 conductor, 26 rotating shaft, 27a, 27b Bearing.

Claims (6)

A stator fixed in a cylindrical frame having a bottom, a cylinder having a bottom, an opening covering the stator, a bracket fixed to the frame, and an inner periphery of the stator; It is disposed through a gap, and is fixed to a rotary shaft that is rotatably supported via a bearing at the center of the bottom of the frame and the center of the bottom of the bracket, and has a rotor core between the bearings. In the manufacturing method of the rotating electrical machine comprising a rotor that rotates coaxially with the central axis of the stator,
The stator is fixed to the frame, the rotor is disposed in the stator, and the bracket is placed on the stator.
Measure the amount of misalignment of the rotating shaft,
The bracket is moved in the radial direction by a value obtained by multiplying the measured amount of misalignment by the leverage shown in the following formula (1) to correct the misalignment and fix the frame and the bracket. A method of manufacturing a rotating electrical machine.
Leverage ratio = (distance between frame side bearing and bracket side axial end face of rotor core) / (distance between frame side bearing and bracket side bearing) ... Formula (1) When the stator is protruded by a certain amount from the frame, and the bracket is put on the stator, the inner peripheral portion of the stator is between the outer peripheral portion of the protruding stator and the inner peripheral portion of the bracket. 2. The method of manufacturing a rotating electrical machine according to claim 1, wherein a gap having a value obtained by multiplying the amount of the gap with the outer peripheral portion of the rotor by the lever ratio is formed. A cylindrical frame having a bottom, a stator fixed in the frame, a cylinder having a bottom, an opening covering the stator, a bracket fixed to the frame, and a stator Rotation that is arranged through an inner peripheral portion and a gap, is fixed to a rotation shaft that is rotatably supported at the center of the bottom of the frame and the center of the bottom of the bracket, and rotates coaxially with the center axis of the stator In a rotating electrical machine with a child,
A part of the stator protrudes from the opening of the frame;
A gap is provided between the outer periphery of the stator protruding from the opening of the frame and the inner periphery of the bracket to move the bracket in the radial direction to correct the misalignment of the rotating shaft. Rotating electric machine. The rotating electric machine according to claim 3, wherein the frame and the bracket are fixed by laser welding. The opening of the frame and the opening of the bracket are provided with a flange portion and an ear portion projecting radially from the flange portion, and a screw hole is provided in the center of the ear portion, and the flange of the frame and the bracket is provided. 5. The rotating electrical machine according to claim 4, wherein the portions and the ears are butted together, and a welding spot by the laser welding is in the vicinity of a root of the ear. The opening of the frame and the opening of the bracket are provided with a flange portion and an ear portion projecting radially from the flange portion, and a screw hole is provided in the center of the ear portion, and the flange of the frame and the bracket is provided. The parts and the ears are butted together, a sealant is provided on the face of the frame and the flanges of the bracket, and the welding spot by the laser welding is near the tip of the ear. The rotating electrical machine according to claim 4.

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