JP3263613B2 - motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor having a structure in which a spacer is arranged between a motor substrate and a stator core, and the spacer defines a height position of the stator core with respect to the motor substrate.

[0002]

2. Description of the Related Art As a brushless motor, a cylindrical bearing holder is mounted and fixed on a motor substrate, and a stator core is arranged so as to surround the bearing holder, and a bearing supported on an inner peripheral surface of the bearing holder. A configuration in which a rotor shaft is rotatably supported is known. For example, Japanese Patent Application Laid-Open No. 6-54505 discloses a brushless motor of this type.

In this type of motor, an annular spacer is arranged between the stator core and the motor substrate in order to define the mounting position of the stator core in the axial direction of the motor. With the spacer interposed, a state can be formed in which the end faces of the stator core face each other at a predetermined distance from the motor substrate. Since the gap is formed between the two, the coil winding wound around the salient poles of the stator core does not hit the surface of the motor substrate. In general, the thickness of the motor (the length in the axial direction of the motor) is defined by a motor installation space formed in various devices on which the motor is mounted. Therefore, by adjusting the thickness of the spacer (the length in the motor axis direction), it is possible to realize a motor dimension suitable for the installation space.

[0004]

Here, the stator core must be positioned with respect to the motor board in the direction of the motor axis and also about the motor axis. For example, in a brushless motor, a plurality of Hall elements are attached to detect a magnetic pole position of a rotor and generate a motor drive signal. In this case, it is necessary to attach the stator core to the outer periphery of the bearing holder so that the salient pole position of the stator core has an appropriate arrangement relationship with the Hall element arranged on the motor substrate.

However, a simple mechanism for positioning the stator core at an appropriate position around the motor axis has not been proposed. For this reason, there is a problem to be solved that the mounting work of the stator core is complicated.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a configuration in which the positioning of the stator core with respect to the motor substrate can be easily performed not only in the motor axis direction but also around the motor axis by using an annular spacer. The present invention is to propose a motor provided with such a motor.

[0007]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a motor board and a board-side housing of the motor board.
A cylindrical bearing holder fixed in the through hole,
A core-side holder insertion hole through which the bearing holder is inserted is formed.
As well as surrounding the bearing holder
And the inner surface of the bearing holder
A rotor rotatably supported by a bearing
Is configured as follows.

That is, the motor according to the present invention includes
Put the data core in the motor axis direction with respect to the motor board.
It has a spacer to hold at a position separated by a predetermined interval,
First, the motor board and the stator
Arranged between the cores so as to surround the bearing holder
A torso body, and both annular end faces of the torso body are
The core side with respect to the stator core and the motor substrate
The edge of the holder insertion hole and the board side holder insertion hole
The stays at the edges
Tab core in the motor axis direction with respect to the motor board
Characterized in that the
You. Here, the spacer has a thin plate shape in the radial direction.
The annular body of the spacer has the motor substrate side
To protrude in the motor axis direction with respect to the annular end face of
While one protrusion is formed on the motor substrate,
From the inner peripheral edge of the board side holder insertion hole in the radial direction.
Cut out toward the side and insert the first projection
A first groove is formed. This allows the space
Do not rotate the motor around the motor axis with respect to the motor board.
The first engaging portion is configured so as to be engaged in such a manner. Sa
In addition, the annular body of the spacer includes the stator core.
So that it protrudes in the motor axis direction from the annular end face
A second projection is formed on the stator core;
At a radius from the inner peripheral edge of the core side holder insertion hole.
Cut out toward the outside in the direction, and the second protrusion is inserted.
A second groove to be inserted is formed. This allows
Put the stator core around the motor axis with respect to the spacer.
A second engaging portion for engaging so as not to rotate is configured
I have.

In the present invention, the first projection and the first projection
The protrusion 2 is, for example, a motor shaft in the annular body.
They are formed at positions overlapping in the line direction. Also before
The first protrusion and the second protrusion may be, for example, the circle
A plurality is formed for the annular body.

In the motor of the present invention, the positioning of the stator core around the motor axis with respect to the motor substrate is performed via the spacer. Therefore, the work of mounting the stator core can be easily performed.

In the case where the first and second engaging portions for positioning around the motor axis are constituted by projections and grooves into which the projections can be inserted, these engaging portions are: These mechanical engagements also serve as a detent for the stator core. For this reason, even if an external force acts on the stator core in the direction in which it is rotated, the stator core can be securely fixed so as not to rotate.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a motor to which the present invention is applied will be described with reference to the drawings.

FIG. 1 shows a sectional structure of a motor to which the present invention is applied. The motor 1 includes a motor board 2,
A cylindrical bearing holder 3 is inserted and fixed in the circular opening 2 a opened in the motor board 2. A stator core 4 having a configuration in which a large number of core plates are stacked is arranged so as to surround the bearing holder 3. A plurality of salient poles 41 are formed at equal angular intervals on the outer peripheral portion of the stator core 4, and a coil winding 42 is wound around and fixed to each salient pole 41.

On the inner circumferential surface of the bearing holder 3, two annular metal bearings 5a and 5b are supported at intervals in the direction of the motor axis L, and the rotor shaft 6 is rotated by these bearings. It is freely supported. A cup-shaped rotor case 7 is fixed to a portion of the rotor shaft 6 protruding from the metal bearing 5 a in a state of being opened to the motor board 2 side. An annular rotor magnet 8 is fixed to the circular inner peripheral surface of the rotor case 7 so as to face the outer peripheral surface of the stator core 4.

A plurality of, for example, three Hall elements 9 as magnetic pole sensors are mounted on the surface of the motor substrate 2 at a position facing the annular end face 8a of the rotor magnet 8 (only one in FIG. 1). Shown).

Here, a spacer 10 is arranged between the motor board 2 and the stator core 4. This spacer 1
With 0, the stator core 4 can be positioned with respect to the motor substrate 2 in the direction of the motor axis L, and can also be positioned around the motor axis L.

FIG. 2 shows the spacer 10 taken out, and the structure of the spacer 10 will be described with reference to FIG. The spacer 10 has an annular body 11 arranged so as to surround the bearing holder 3. An annular end surface 11a on the motor board side of the body 11 has two protrusions 12a and 12b of the same shape protruding in the direction of the motor axis L.
Are formed. Similarly, two protrusions 13a and 13b of the same shape protruding in the direction of the motor axis L are also formed on the annular end face 11b of the body 11 on the stator core side. In this example, as can be seen from FIG.
12b is formed at a point symmetrical position on the annular end face 11a, and the projection 13a is formed with the projection 12a in the motor axial direction.
They are formed at overlapping positions. Similarly, the protrusion 13b
Formed in a position that overlaps the protrusion 12b in the motor axis direction.
Have been. Here, the spacer 10 is a thin plate in the radial direction.
Annular end face 11b of the annular body 11, an annular end face
11a is medium with respect to stator core 4 and motor board 2.
Edge portion of circular hole 4a (core-side holder insertion hole) and circular opening
2a (board side holder insertion hole)
As a result, the stator core 4 is
Can be held at a predetermined distance in the motor axis direction
It is.

On the other hand, as shown in FIG. 3, on the motor substrate 2 side, grooves 21a and 21b into which two projections 12a and 12b on the spacer 10 side can be inserted in the direction of the motor axis L are provided. Are formed at positions corresponding to these projections. These grooves 21a and 21b are formed by cutting out the inner peripheral edge of the circular opening 2a to which the bearing holder 3 is attached.

Further, as shown in FIG.
The two projections 13 on the side of the spacer 10
a, 13b into which the motor 3 can be inserted in the direction of the motor axis L
1a and 31b are formed at positions corresponding to these projections. These grooves 31a and 31b are also formed by cutting out the inner peripheral edge of the center hole 4a in the end face of the stator core 4 on the spacer side.

In the motor 1 of the present embodiment thus configured, after the bearing holder 3 is fixed to the motor substrate 2,
The spacer 10 is fitted on the outer periphery of the bearing holder 3. At this time, by rotating the spacer 10 around the motor axis L, the two protrusions 12a, 12b
Are aligned with the corresponding grooves 21a and 21b on the motor substrate side, and inserted into these grooves. As a result, the spacer 10 is engaged with the motor substrate 2 by the first engagement portion constituted by the projections and the grooves without rotating around the motor axis L.

Next, the stator core 4 is mounted on the outer periphery of the bearing holder 3. In this case, 2 on the side of the spacer 10
Protrusions 13a and 13b are formed in two grooves 3 of the stator core 4.
The stator core 4 is rotated around the motor axis L to adjust the rotation angle position so as to match 1a, 31b, and the protrusion is inserted into the groove in a state where they match. As a result, the stator core 4 is engaged with the spacer 10 by the second engagement portion constituted by the projections and the grooves without rotating around the motor axis L.

In this way, the stator core 4 is attached to the motor board 2 via the spacer 10 at an appropriate rotation angle position. Further, the stator core 4 is held at a position at a fixed interval with respect to the motor board 2 by the annular body 11 of the spacer 10. Therefore,
The positioning of the stator core 4 in the direction of the motor axis L and the positioning of the stator core 4 around the motor axis L are simultaneously performed by the spacers 10. Therefore, the positioning of the stator core 4 can be performed extremely easily.

Further, since the stator core 4 is fixed to the motor substrate 2 via the spacers 10 by mechanical engagement of the projections and grooves, such mechanical engagement prevents the stator core 4 from rotating. Function as

The spacer 10 may be made of resin.
Or metal.

The number of protrusions formed on the spacer 10
Is not limited to two as described above, but one
Or three or more. Corresponding
Grooves may be formed in a number corresponding to the number of protrusions.

[0026]

As described above, in the motor according to the present invention, the spacer arranged between the motor substrate and the stator core has a positioning function in the motor axis direction of the stator core as well as a positioning function around the motor axis. is there. Therefore, the positioning of the stator core can be performed by a very simple operation of assembling the spacer and the stator core in this order on the motor substrate side. In addition, as a positioning mechanism around the motor axis, a configuration including protrusions and grooves that mechanically engage is adopted,
This engaging portion also has the advantage of functioning as a detent for the stator core.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a motor to which the present invention is applied.

FIG. 2 is a perspective view of a spacer of the motor of FIG. 1;

FIG. 3 is a plan view of a motor board of the motor of FIG. 1;

FIG. 4 is an end view of a stator core of the motor of FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor 2 Motor board 2a Circular opening for bearing holder formed in motor board 21a, 21b Groove formed in motor board 3 Bearing holder 4 Stator core 31a, 31b Groove formed in stator core 5a, 5b Metal bearing 6 Rotor shaft 9 Hall element DESCRIPTION OF SYMBOLS 10 Spacer 11 Toroidal body part 12a, 12b Projection of spacer on motor substrate side 13a, 13b Projection of spacer on stator core side L Motor axis

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 29/00 H02K 5/00 H02K 21/00

Claims (3)

(57) [Claims] A motor board, and a board-side housing of the motor board.
A cylindrical bearing holder fixed to holder insertion hole, the
A core-side holder insertion hole through which the bearing holder is inserted is formed.
As well as surrounding the bearing holder
And a rotor rotatably supported by a bearing held on the inner peripheral surface of the bearing holder, wherein the bearing housing is provided between the motor substrate and the stator core.
An annular body arranged to surround the rudder,
Both annular end faces of the annular body are the stator core and the
The edge of the core-side holder insertion hole and the motor board
And the edge of the board side holder insertion hole.
The stator core to the motor substrate
At a predetermined distance in the motor axis direction.
Holding a radially thin plate-shaped spacer, with respect to an annular end face of the annular body on the motor board side.
A first projection formed to project in the motor axis direction;
And inserting the board-side holder into the motor board.
Notched radially outward from the inner periphery of the through hole
By the first groove into which the first protrusion is inserted,
Turn the spacer around the motor axis with respect to the motor board.
A first engaging portion configured to engage so as not to rotate;
And a ring on the stator core side of the annular body portion
Formed so as to protrude in the motor axis direction with respect to the
The second protrusion, and the stator core
From the inner peripheral edge of the core-side holder insertion hole toward the outside in the radial direction
A second groove into which the second protrusion is cut and inserted
As a result, the stator core is
Second engagement for preventing rotation around the motor axis
A motor characterized by comprising a part. 2. The method according to claim 1, wherein the first projection and the front projection are provided.
The second projection is provided on the torso body in the direction of the motor axis.
Characterized by being formed in overlapping positions in the directions
Motor. 3. The method according to claim 1, wherein the first
The projection and the second projection are arranged with respect to the annular body.
A plurality of motors.