JP2002345221A - Permanent-magnet field motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the vibration and noise of a permanent-magnet field motor, and to prevent reduction of the operation efficiency and increase of the cost, preventing a positioning error from becoming larger. SOLUTION: The breadth L3 of mark A in the circumferential direction of a rotor 20 made a dimension correlating with the teeth 11b. As a result of this, it is possible to do away with the cutouts necessary of the conventionally teeth 11b, since the teeth 11b can be utilized as stator-side marks B as they are. Accordingly, it is possible to prevent magnetic paths by a stator 10 from being asymmetrical, reduce the vibration and noise of the motor, and prevent reduction of the operation efficiency of the motor. In addition, it is possible to prevent increase of the kinds of press dies, and prevent increase of man-hours and increase of cost for dies caused by a die change. Besides, a positioning error can be reduced down to a specified range, since direct portions of the stator 10 and the rotor 20 can be used as marks.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet field type motor having a permanent magnet on a rotor.

[0002]

2. Description of the Related Art A permanent magnet of a permanent magnet field type electric motor does not have a magnetic pole at first, and a magnetic pole is formed only by a magnetizing process performed after the production of the permanent magnet is completed. In such an electric motor, a method of magnetizing using a winding wound around a stator after assembling a rotor to the stator without using a magnetizer is often adopted.

In such a magnetization, it is necessary to perform the magnetization in a state where the rotor is aligned with the stator so that the axis of the magnetic pole of the winding coincides with the axis of the permanent magnet. If magnetization is performed with both axes shifted,
Reduction in the operating efficiency of the motor due to the decrease in the total magnetic flux amount of the permanent magnet, and vibration of the motor due to uneven distribution of the magnetic flux of the permanent magnet,
It causes noise generation.

Therefore, in a conventional permanent magnet field type electric motor,
In order to accurately position the rotor, a mark A is provided on the rotor side, and a mark B corresponding to the mark A is provided on the stator side. For example, in the electric motor described in Japanese Utility Model Publication No. 6-28945, as shown in FIG.
A notch 11e is provided at the tip of a tooth 11b provided on the stator core 11 of FIG.

[0005]

Here, although not described in the above publication, the notch 11e is oriented in the direction of the rotation axis (FIG. 8).
If it is provided over the entire length of (a) in the direction perpendicular to the plane of the drawing), the magnetic path (magnetic circuit) formed by the stator 10 becomes asymmetric.
There is a concern that the cause of the vibration and noise generation of the motor and the decrease in the operating efficiency of the motor due to a decrease in the effective magnetic flux. On the other hand, when the cutout 11e is provided only in a part of the rotation axis direction, the stator 10 is generally formed by laminating a plurality of press-formed steel sheets. It is necessary to produce two types of steel plates, one with and one without. Therefore, there are two types of press dies for the steel sheet, which leads to an increase in man-hours and an increase in die cost due to the change of the dies during press forming.

In the electric motor described in Japanese Patent Application Laid-Open No. 3-93449, as shown in FIG. 8B, a mark A is provided on the rotating shaft 25 of the rotor 20, and a mark B is provided on the housing 13 for fixing the stator 10. Is provided. In this case, the above problem does not occur. On the other hand, since the housing 13 and the rotating shaft 25 are interposed to adjust the positional relationship between the rotor 20 and the stator 10, there is a problem that a positioning error increases.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to suppress a decrease in vibration, noise, operating efficiency, and cost of a permanent magnet field type motor while preventing a positioning error from increasing.

[0008]

SUMMARY OF THE INVENTION The present invention achieves the above-mentioned object by focusing on the existence of teeth provided on any stator. A rotor comprising a stator (10) having a stator core (11) to be formed, a plurality of teeth (11b) provided on the stator core (11), and a winding wound around the teeth (11b), and forming a magnetic path. In a permanent magnet field type electric motor including a rotor (20) having an iron core (21) and a permanent magnet (23) provided on a rotor iron core (21), a stator (1) is attached to the rotor (20).
0), a mark (A) indicating a positional relationship with respect to the tooth (11b) and a fixed correlation between the width (L3, L4, L5) of the rotor (20) in the circumferential direction of the mark (A). The feature is that it was set to the dimensions in.

Thus, since the teeth (11b) can be used as they are as the mark B on the stator side, the notch portion of the teeth (11b), which was conventionally required, can be eliminated. Therefore, it is possible to suppress the magnetic path due to the stator (10) from being asymmetric, and to suppress a decrease in operation efficiency due to a decrease in vibration, noise, and total magnetic flux of the electric motor.

In addition, even if the stator (10) is formed by laminating a plurality of press-formed steel sheets, the present invention can eliminate the notch of the teeth (11b). An increase in the number of types of press dies can be prevented, and an increase in man-hours due to die change during press molding and an increase in cost due to an increase in die cost can be suppressed.

The stator (10) and the rotor (2)
Since the direct portion of 0) can be used as a mark, the positioning error can be prevented from increasing.

According to the second aspect of the present invention, the rotor core (21) is formed by laminating a large number of circular plates (210), and both ends of the rotor core (21) of the rotor (20). Are provided with a pair of end plates (22), and the end plates (22) are provided with marks (A).

Here, in the present invention, the mark (A) may be provided on the circular plate (210), but in such a case, the magnetic path by the rotor (20) becomes asymmetric, so that the motor There is considerable concern that the cause of the vibration and noise generation of the motor and the reduction in the operating efficiency of the motor due to the reduction of the effective magnetic flux.

On the other hand, when the mark (A) is provided on the end plate (22) as in the invention according to claim 2, the rotor (20) can be provided in comparison with the case where the mark (A) is provided on the circular plate (210). Can reduce the asymmetrical magnetic path, thereby suppressing the vibration and noise of the electric motor and suppressing the decrease in the operating efficiency of the electric motor due to the reduction of the effective magnetic flux.

According to a third aspect of the present invention, there is provided an end plate (2).
A cutout (22c) is formed in the outer peripheral edge of 2), and this cutout (22c) is suitable as the mark (A). In particular,
When the end plate (22) is formed by press-forming a steel plate, the notch (22c) can be formed simultaneously with the press-forming, so that the mark (A) can be easily provided.

Further, when the width (L3) of the mark (A) is made substantially the same as the width (L1) of the teeth (11b) in the circumferential direction as in the invention according to claim 4, the mark ( Among the dimensions of A), the circumferential width dimension (L3) of the rotor (20)
Can easily be made to have a size having a certain correlation with the teeth (11b), which is preferable.

Further, the width (L4) of the mark (A) may be made substantially the same as the slot opening width (L2) of the stator (10). This is preferable because the circumferential width dimension (L4) of the rotor (20) among the dimensions of the mark (A) can be easily set to a dimension having a certain correlation with the teeth (11b).

The invention according to claim 6 is the first invention.
6. The method of magnetizing a permanent magnet field type electric motor according to any one of claims 1 to 5, wherein the rotor (20) is connected to the stator (1).
0), the rotor (20) is positioned at a predetermined position on the stator (10) by aligning the mark (A) with a predetermined portion of the teeth (11b), and the winding is energized in this aligned state. The permanent magnet (2
3) is characterized by being magnetized.

As described above, by using the permanent magnet field type electric motor according to any one of claims 1 to 5, the accuracy of positioning the rotor (20) at a predetermined position of the stator (10) can be ensured. The positioning error can be kept within a predetermined range. Therefore, it is possible to suppress a decrease in the operating efficiency of the electric motor due to a decrease in the total magnetic flux amount of the permanent magnet (23), and to suppress the vibration and noise of the electric motor due to the uneven magnetic flux distribution of the permanent magnet (23).

The invention described in claim 7 is the first invention.
5. The rare inspection method for a permanent magnet field type electric motor according to any one of items 1 to 5, wherein the mark (A) is a tooth (11).
By adjusting to the predetermined part of b), the rotor (20)
Is positioned at a predetermined position of the stator (10), and the winding is energized in this aligned state to inspect the winding for rarity.

Here, the rotor (20) is connected to the stator (1).
If the rare inspection is performed in a state deviated from the predetermined position of 0), the inspection accuracy of the rare inspection becomes very poor. On the other hand, as in the invention described in claim 7, claims 1 to 5
If the permanent magnet field type electric motor described in any one of the above is used, the accuracy of positioning the rotor (20) at a predetermined position of the stator (10) can be secured, and the positioning error can be kept within a predetermined range. Therefore, the inspection accuracy by the rare inspection can be secured.

The reference numerals in parentheses of the above means are examples showing the correspondence with specific means described in the embodiments described later.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a plan view of a permanent magnet field type electric motor. 1 is a stator, and 20 is a reference numeral.
Denotes a rotor, and the stator 10 is configured by winding a winding (not shown) around a stator core 11 forming a magnetic path. Reference numeral 12 in FIG. 1 indicates a magnetic pole when the winding is energized.

FIG. 2 is a plan view showing the stator core 11. The stator core 11 includes a yoke portion 11a and a yoke portion 11a.
and a plurality of teeth 11b arranged at equal intervals in the circumferential direction on the inside of a. A slot 11c for accommodating a winding is formed between the adjacent teeth 11b. In addition, the code | symbol L1 in FIG. 2 shows the surface width (dimension of the circumferential direction) of the teeth 11b, and the code | symbol L2 has shown the circumferential dimension of the slot opening 11d which is the opening part of the slot 11c.

FIG. 3 is a plan view of the rotor 20, and FIG. 4 is a cross-sectional view taken along the line XX of FIG. 3. The rotor 20 includes a rotor core 21, an end plate 22, a permanent magnet 23, and a protection pipe 2.
4.

The rotor core 21 includes a large number of circular plates 210
Are laminated to form a magnetic path (magnetic circuit). The circular plate 210 has a rotation shaft insertion hole 210a for inserting a rotation shaft (not shown) at the center, and a yoke portion 210 around the rotation shaft insertion hole 210a.
b, and a magnet insertion portion 210c around which a plurality of (four in the present embodiment) permanent magnets 23 are inserted. The rotation shaft insertion hole 21 of the yoke portion 210b
A portion around 0a has a rivet insertion hole 210d for inserting a rivet (not shown).

The end plate 22 is for preventing the permanent magnet 23 from being scattered in the axial direction by the centrifugal force during the operation of the permanent magnet field type motor, and covers both axial ends of the rotor core 21. ing. The end plate 22 also has a rotation shaft insertion hole 22a and a rivet insertion hole 22b at positions corresponding to the rotation shaft insertion hole 210a and the rivet insertion hole 210d of the circular plate 210.

A notch 22c is formed as a mark A at the center of the two permanent magnets 23 in the outer peripheral edge of the end plate 22. The width L3 of the notch 22c in the circumferential direction of the rotor 20 is set to have a certain correlation with the teeth 11b. Specifically, the width dimension L3 of the notch 22c of the present embodiment is set to the same dimension as the surface width L1 of the tooth 11b.

The notch 22c is formed in a shape penetrating in the rotor axial direction (vertical direction in FIG. 4) as shown in FIG. And the circular plate 210 and the end plate 22
The steel plate (for example, a steel plate having a thickness of 1 mm) is formed into a predetermined shape by press forming, and the notch 22c is formed at the same time when the end plate 22 is pressed.

The permanent magnet 23 is formed by shaping magnetic powder into an arc shape, has no magnetic pole at the time of manufacture, and forms a magnetic pole for the first time by a magnetizing process to be described later after manufacture. In the present embodiment, four permanent magnets 23 having the same shape are arranged at equal intervals around the rotor core 21. The protection pipe 24 is for preventing the permanent magnet 23 from being scattered in the rotational direction by centrifugal force during the operation of the permanent magnet field type electric motor, and is formed in a cylindrical shape and has an outer periphery of the rotor core 21. Covering the surface.

Next, the procedure for assembling the rotor 20 will be briefly described. First, the circular plates 210 are stacked, and the permanent magnets 23 are inserted into the four magnet insertion portions 210c. Then, end plates 22 are arranged at both axial ends of the rotor core 21, and rivets are inserted into the four rivet insertion holes 210d and caulked to fix the whole. And protection pipe 2
4 is assembled.

Next, the procedure for magnetizing the permanent magnet 23 will be described.

First, the rotor 20 assembled according to the above procedure is assembled to the stator 10. And FIG.
As shown in the figure, the notch 22c serving as the mark A is aligned with a predetermined tooth 11b among the plurality of teeth 11b.
Here, when the rotor 20 is aligned with the stator 10 in this manner, an axis Q (in FIG. 1) passing through the center axis P of the magnetic pole 12 of the winding (dashed line in FIG. 1) and the center of the permanent magnet 23 in the circumferential direction. And one-dot chain line). Next, a magnetizing current is applied to the windings in such a state that they are aligned to conduct electricity. Due to this energization, a magnetomotive force is generated in the stator 10, and the opposing permanent magnets 23 form the S pole,
The remaining two opposing permanent magnets 23 are normally magnetized to the N pole.

Here, if the axis P of the magnetomotive force of the winding of the stator 10 and the axis P of the permanent magnet 23 are slightly displaced,
The reduction in the operating efficiency of the electric motor due to the decrease in the total magnetic flux amount of the permanent magnet 23 and the generation of vibration and noise of the electric motor due to the non-uniform magnetic flux distribution of the permanent magnet 23 are caused. On the other hand, in the present embodiment, the rotor 20 is aligned with the stator 10 by aligning the notch 22c serving as the mark A with the predetermined tooth 11b, so that a direct portion of the stator 10 and the rotor 20 is used as a mark. As a result, the positioning error can be prevented from increasing.

In the present embodiment, as described above, the width L3 in the circumferential direction of the rotor 20 out of the dimensions of the notch portion 22c.
Are set to the same dimensions as the surface width L1 of the teeth 11b, so that the teeth 11b are
Can be used as a tooth 11
The notch b can be eliminated. Therefore, it is possible to suppress the magnetic path of the stator 10 from being asymmetric, and it is possible to suppress the decrease in the operating efficiency due to the reduction in the vibration, noise, and total magnetic flux of the electric motor.

According to the present embodiment, the notch of the teeth 11b can be eliminated as described above.
It is possible to prevent an increase in the number of types of press dies for press molding, and to suppress an increase in man-hours due to mold change during press molding and an increase in cost due to an increase in mold cost.

In the present invention, the mark A may be provided on the circular plate 210. In such a case, the magnetic path of the rotor 20 is asymmetric, so that the vibration of the motor can be reduced.
There is considerable concern about the cause of noise generation and the decrease in operating efficiency of the motor due to the decrease in effective magnetic flux. On the other hand, in the present embodiment, since the mark A is provided on the end plate 22, it is possible to reduce the asymmetrical magnetic path of the rotor 20 as compared with the case where the mark A is provided on the circular plate 210, and to generate vibration and noise of the electric motor. And a reduction in the operating efficiency of the motor due to a reduction in the effective magnetic flux can be achieved.

Further, since the notch 22c of this embodiment is formed in a shape penetrating in the rotor axial direction (vertical direction in FIG. 4), the notch 22c can be formed at the same time when the end plate 22 is pressed. The notch 22c can be easily formed.

(Second Embodiment) In the first embodiment, the notch 22c formed as the mark A is
When set to b, the central axis P of the magnetic pole 12 and the axis Q passing through the circumferential center of the permanent magnet 23 overlap. On the other hand, in the present embodiment, as shown in FIG.
When 2d is adjusted to a predetermined slot opening 11d, the central axis P of the magnetic pole 12 and the axis Q passing through the circumferential center of the permanent magnet 23 overlap.

Therefore, in the first embodiment, the notch 22c
The width dimension L3, which is the outer circumferential projection width of the rotor in the circumferential direction, is set to the same dimension as the surface width L1 of the teeth 11b. Width L4 which is the rotor width projected width in the direction width
(See FIG. 6) is set to the same dimension as the circumferential dimension L2 of the slot opening 11d.

(Third Embodiment) The notch 22c formed as the mark A of the present invention has a width in the circumferential direction of the rotor 20 (L3 in the first embodiment, L2 in the second embodiment, of the size of the notch 22c). In this case, L4) may be a dimension having a certain correlation with the teeth 11b, and is not limited to the dimensions L3 and L4 of the first and second embodiments. For example, as in the present embodiment shown in FIG. 7, the width L5 in the circumferential direction of the rotor 20 in the size of the notch 22c is connected to the corners of the teeth 11b located on both sides of the predetermined tooth 11b. It is set to the same size as the length L5.

As shown in FIG. 7, the width of the notch portion 22c in the circumferential direction of the rotor 20 is set to the length L connecting the approximate centers of the adjacent slot openings 11d.
6 may be set to the same size.

(Other Embodiments) In the first to third embodiments, the electric motor of the present invention is applied to the positioning of the rotor 20 and the stator 10 when the permanent magnet 23 is magnetized. The permanent magnet field type electric motor can ensure the accuracy of positioning the rotor 20 at a predetermined position of the stator 10, and is not limited to the application of positioning when performing magnetization. For example, when performing a rare inspection, the rotor 2
You may make it apply to the positioning of 0 and the stator 10.

In the first to third embodiments, the notch 22c formed as the mark A is inserted into the end plate 22 of the rotor 20.
However, the present invention is not limited to the arrangement in which the mark A is provided on the end plate 22, and may be provided on, for example, a circular plate 210 constituting the core 21. Further, the protection pipe 24 may be provided.

In the first to third embodiments, the notch 22
c is the mark A, but the mark A of the present invention is the notch 22
For example, the mark A may be painted on the rotor 20 without being limited to c. Further, the end plate 22 may be provided with a protruding portion that protrudes in the rotor axial direction (vertical direction in FIG. 4), and this protruding portion may be used as the mark A. Alternatively, the notch 22c may be cut without penetrating in the rotor axis direction (the vertical direction in FIG. 4).

The permanent magnet rotating machine of the present invention is suitable for use in, for example, a permanent magnet field type electric motor of an electric compressor.

[Brief description of the drawings]

FIG. 1 is a plan view of a permanent magnet field type electric motor according to a first embodiment of the present invention.

FIG. 2 is a plan view of a stator core according to the first embodiment.

FIG. 3 is a plan view of the rotor according to the first embodiment.

FIG. 4 is a sectional view showing a section taken along line XX of FIG. 3;

FIG. 5 is a plan view of a permanent magnet field type electric motor according to a second embodiment.

FIG. 6 is a plan view of a rotor according to a second embodiment of the present invention.

FIG. 7 is an enlarged plan view of a permanent magnet field type electric motor according to a third embodiment.

8A is a plan view showing only a stator core of a conventional permanent magnet field type electric motor, and FIG. 8B is a plan view of a conventional permanent magnet field type electric motor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Stator, 11 ... Stator iron core, 11b ... Teeth, 20 ... Rotor, 21 ... Rotor iron core, 22 ... End plate, 2
2c: Notch (mark A), 23: permanent magnet, A: mark.

Continued on the front page F term (reference) 5H002 AA07 AB06 AB07 AE07 AE08 5H621 GA01 GA04 GA12 GA14 GA16 HH03 HH04 JK02 5H622 AA03 CA02 CA07 CA13 CB04 CB06 PP03 PP14 PP16 PP18

Claims (7)

[Claims] A stator (10) having a stator core (11) forming a magnetic path, a plurality of teeth (11b) provided on the stator core (11), and a winding wound around the teeth (11b). ), A rotor core (21) forming a magnetic path, and the rotor core (2).
1) A permanent magnet field type electric motor including a rotor (20) having a permanent magnet (23) provided in (1), wherein the rotor (20) has a mark (A) indicating a positional relationship with respect to the stator (10). The width dimension (L3, L4, L5) of the rotor (20) in the circumferential direction among the dimensions of the mark (A) is set to the tooth (1).
1b) A permanent magnet field type electric motor characterized in that the dimensions are in a certain correlation with that of 1b). 2. The rotor core (21) is formed by laminating a large number of circular plates (210), and a pair of end plates (2) at both ends of the rotor core (21) of the rotor (20). 22. The permanent magnet field type electric motor according to claim 1, further comprising: (22); and the mark (A) provided on the end plate (22). 3. A notch (2) is formed at an outer peripheral edge of said end plate (22).
2. The permanent magnet field type electric motor according to claim 2, wherein the notch (22 c) is formed as the mark (A). 4. The width dimension (L3) of the mark (A)
To the circumferential width dimension (L1) of the teeth (11b).
The permanent magnet field type electric motor according to any one of claims 1 to 3, wherein the electric motor is substantially the same as: 5. The width dimension (L4) of the mark (A)
The permanent magnet field type electric motor according to any one of claims 1 to 3, wherein a width of the opening (L2) of the stator (10) is substantially the same as that of the stator (10). 6. The method for magnetizing a permanent magnet field type electric motor according to claim 1, wherein the rotor (20) is assembled to the stator (10), and the mark (A) is provided. ) Is aligned with a predetermined portion of the teeth (11b) to align the rotor (20) with a predetermined position of the stator (10). A method of magnetizing a permanent magnet field type electric motor, comprising magnetizing a permanent magnet (23). 7. The rare inspection method for a permanent magnet field type electric motor according to claim 1, wherein the mark (A) is aligned with a predetermined portion of the teeth (11b). And positioning the rotor (20) at a predetermined position of the stator (10), and applying a current to the winding in the aligned state to inspect the winding for rarity. Rare inspection method for magnetic motors.