JPH0584151U - Stator core steel plate and stator - Google Patents

Abstract

(57) [Summary] [Object] The present invention is to provide a core steel plate of a stator capable of improving magnetic efficiency and a stator using the same. [Structure] A plurality of core steel plates 1 of the present invention are laminated in the thickness direction to form a stator core 6, and a width of a notch 5 serving as a magnet insertion groove 7 of the stator core 6 increases toward the outer side in the radial direction. Is formed. Therefore, when the magnet 9 having substantially the same shape as the notch 5 is mounted in the groove 7, the widths of the insertion side end portions 9c of the magnet 9 are appropriately determined in advance so that the magnetic pole surfaces 9a and 9b of the magnet 9 are formed in the grooves. Can be brought into close contact with the corresponding side faces 7a, 7b of 7,
Moreover, the insertion side end portion 9c of the magnet 9 is attached to the bottom surface 7c of the groove 7.
Can be located at a distance from.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a motor stator and a core steel plate that is a component thereof.

[0002]

[Prior Art]

 FIG. 5 is a diagram showing a conventional general stator used in a DC servo motor used in OA equipment and the like. In FIG. 5, one magnet is removed for the sake of explanation. The stator shown in the drawing is composed of a stator core 51 formed by stacking and joining a number of core steel plates 50 together, and a magnet 53 inserted and fixed in each magnet mounting groove 52 of the stator core 51. A rotor 54 is arranged in the portion.

The core steel plate 50 is formed by an appropriate means such as punching a thin steel plate, and includes a core main body portion 56 in which a central hole 55 for arranging the rotor 54 is formed, and the core body portion 56. It is composed of four core protrusions 57 that are integrally formed with the main body 56 and extend radially outward. Each core protrusion 57 is formed with a rectangular notch 58 extending radially inward from the outer edge of the core protrusion 57. The notch 58 is aligned by stacking core steel plates 50 to form a groove 52 for mounting a magnet. To do. Further, the radially inner end of the notch 58 is widened to form a magnetic flux bypass portion 58a. In a state where the magnet 53 is mounted in the magnet mounting groove 52 of the stator core 51, the magnetic flux of the magnet 53 bypasses the magnetic flux bypass portion 58a and acts relatively uniformly on the rotor 54.

[0004]

[Problems to be solved by the device]

 By the way, the stator is required to suppress the leakage magnetic flux as much as possible in order to increase the magnetic efficiency of the magnet 53. However, in the conventional stator as described above, as clearly shown in FIG. 6, the insertion side end of the magnet 53 is located on the bottom surface 52a of the magnet insertion groove 52 (in the radial direction inside the notch 58 of the core steel plate 50). Since a part of the magnetic flux from the magnet 53 flows in a loop shape at a portion 59 between the magnetic flux bypass portion 58a and the rotor insertion central hole 55, a leakage magnetic flux is generated. It was.

Further, since the tip portions of both magnetic pole surfaces of the N pole and the S pole of the magnet 53 do not come into contact with the core steel plate 50 due to the existence of the magnetic flux bypass portion 58a, this portion is not effectively used as a magnet. .. Therefore, this portion of the magnet 53 is substantially unnecessary, which is a negative factor in terms of cost and weight of the motor.

Further, in order to facilitate the insertion of the magnet 53 into the magnet mounting groove 52, conventionally, the width of the notch 58 of the core steel plate 50 and the width of the magnet 53 have a gap fitting relationship. Therefore, it is common that a gap 60 is formed between the magnetic pole surface of the magnet 53 and the side edge of the notch 58, as can be seen from FIG. If the gap 60 is large, the magnetic resistance increases, which causes a problem of reducing the magnetic efficiency.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a core steel plate of a stator that enables effective use of a magnet and a stator using the same.

[0008]

[Means for Solving the Problems]

 In order to achieve the above object, a device according to claim 1 is a core steel plate that constitutes a stator core of a stator in a motor by being laminated in a thickness direction, and a central hole into which a rotor is inserted and arranged. And a plurality of notches that extend radially inward from the outer edge portion and that form a groove for magnet mounting in a stacked state, in the core steel plate, the width of the notches becomes larger toward the outer side in the radial direction. It is characterized in that both side edges of the notch are formed so as to form a constant angle with respect to each other, and a magnetic flux diverting portion in which the notch is widened is provided at the radially inner end of the notch. I am trying.

The invention according to claim 2 is for mounting a magnet of a stator core formed by stacking the core steel plates in a thickness direction and a stator core formed by a notch in the core steel plate. A magnet inserted in the groove, the angle formed by both magnetic pole surfaces of the magnet is such that each magnetic pole surface of the magnet is in close contact with the corresponding side surface of the groove and the insertion side end is separated from the bottom surface of the groove. Is the same as the angle formed by both side edges of the notch of the core steel plate, and the width of the end portion on the insertion side of the magnet is set to a predetermined value or more.

[0010]

[Action]

 As described above, the notches on both sides of the core steel plate are not parallel, but the width is increased toward the outside in the radial direction. Therefore, by setting the width of the end of the magnet on the insertion side appropriately, each magnetic pole surface of the magnet is brought into close contact with the side surface of the magnet mounting groove, which is an assembly of notches, almost completely. , The insertion end of the magnet is separated from the bottom of the groove.

[0011]

【Example】

 Hereinafter, a preferred embodiment of the present invention will be described with reference to FIGS. 1 to 4 of the accompanying drawings. In the drawings, the same or corresponding parts will be described using the same reference numerals.

FIG. 1 shows a core steel plate 1 according to the present invention used for a stator of a motor such as a DC servo motor. The core steel plate 1 is formed by appropriate means such as punching a thin steel plate. The core steel plate 1 includes a core body 3 having a circular center hole 2 for inserting and arranging a rotor in the center, and four core-shaped bodies 1 which are integral with the core body 3 and which extend radially outward. It has a core protrusion 4. The core protrusions 4 are arranged at equal intervals in the circumferential direction, and each core protrusion 4 is formed with a notch 5 extending radially inward from the center of the outer edge portion thereof. The notch 5, which will be described in more detail below, constitutes a groove for mounting a magnet on the stator core, and is open on the outside so as to receive the magnet from the outside. Further, each notch 5 has its side edges 5a and 5b inclined at a constant angle with respect to each other so that the width becomes larger toward the outside in the radial direction. Further, a magnetic flux bypass portion 5c, which is formed by widening the notch 5, is provided at the radially inner end of the notch 5.

FIG. 2 shows a stator core 6 configured by laminating a large number of core steel plates 1 configured as described above in the thickness direction. Since the core steel plates 1 are stacked with their outer edges aligned, the notches 5 in each core protrusion 4 are aligned in the thickness direction to form a groove 7 for mounting a magnet. After lamination, the core steel plates 1 are joined together by suitable caulking means to form a stator core 6 as a unit. As the caulking means, there are a method of inserting the caulking sleeve 8 into the stud hole and caulking both ends thereof, and a method of forming caulking protrusions on each core steel plate 1 and caulking and coupling at the portions, though not shown.

FIG. 3 is a view showing a stator 10 configured by mounting a magnet 9 on the stator core 6 of FIG. 2, and one magnet 9 is removed for the sake of explanation. The magnet 9 used in the stator 10 has a trapezoidal shape in which the cross section perpendicular to the longitudinal axis is substantially the same as the notch 5 of the core steel plate 1. That is, as clearly shown in FIG. 4, which is an enlarged partial view of FIG. 3, both sides of the magnet 9 which are the magnetic pole surfaces 9a and 9b of the N pole and the S pole have an angle formed by both side edges 5a of the notch 5, It is the same as the angle θ formed by 5b. The width of the insertion side end portion 9c of the magnet 9 is set to be substantially the same as the length L between the side edge portions 5d and 5e of the notch 5 that intersects the radially outer edge portion of the magnetic flux bypass portion 5c. There is. Therefore, when the magnet 9 is inserted into the magnet mounting groove 7 of the stator core 6, the magnetic pole surfaces 9a and 9b of the magnet 9 are in close contact with the corresponding side surfaces 7a and 7b of the groove 7, respectively, and no further insertion is performed. It will be impossible. Further, in this state, the insertion side end portion 9c of the magnet 9 is arranged at a position separated from the bottom surface 7c of the groove 7 by a certain distance, in this case, at the position of the radially outer edge portion of the magnetic flux bypass portion 5c. .. Reference numeral 11 in the drawing is a rotor inserted in the central hole 2.

As described above, since the magnetic pole surfaces 9a and 9b of the magnet 9 are in contact with the side surfaces 7a and 7b of the magnet mounting groove 7 with no gap, both the N pole and the S pole are extremely small, and the resistance on the magnetic circuit is extremely small. Can be suppressed. Further, since the insertion side end portion 9b of the magnet 9 is separated from the bottom surface 7c of the groove 7, almost no leakage magnetic flux is generated in the portion between the magnetic flux bypass portion 5c of each core steel plate 1 and the central hole 2. Therefore, as shown in FIG. 4, the magnetic flux of the magnet 9 bypasses the magnetic flux bypass portion 5c and acts uniformly on the rotor 11. Further, in this embodiment, since the magnet 9 is arranged radially outside the magnetic flux bypass portion 5c, there is no magnetic pole surface portion that does not contact the core steel plate 1 as in the conventional case, and the magnetic pole surfaces 9a and 9b as a whole form magnetic flux. Used for.

In the above-mentioned embodiment, the notch 5 of the core steel plate 1 is symmetrical with respect to the axis A, but it is not particularly limited to this. For example, one of the side edges 5a and 5b may be parallel to the axis A and the other side edge may be inclined with respect to the axis A. In such a case, it is needless to say that the magnet 9 also needs to match the shape of the notch.

Further, the width of the insertion side end portion 9c of the magnet 9 does not need to be the width L of the notch 5 at the radially outer edge portion of the magnetic flux bypass portion 5c as described above, and can be adjusted according to a desired mounting position. The width can be set. For example, when the width L is made larger than the above, the magnet 9 is arranged radially outside of the magnetic flux bypass portion 5c, and conversely, when the width L is made smaller, the insertion side end portion 9c of the magnet 9 causes the magnetic flux bypass portion 5c. It is arranged at a position protruding into the portion 5c.

[0018]

[Effect of the device]

 As described above, according to the present invention, both magnetic pole surfaces of the magnet are in contact with the side surfaces of the magnet mounting groove of the stator core without any gap, and the end of the magnet on the insertion side is spaced from the bottom surface of the groove by a certain distance. The magnetic resistance and leakage flux can be effectively suppressed, and the magnetic flux of the magnet can be effectively applied to the rotor.

Further, in the past, the magnet was inserted until it came into contact with the bottom surface of the magnet insertion groove, and a considerable portion located inside the magnetic flux bypass portion was not useful for forming the magnetic flux and wasted. According to this, this useless portion can be made small or can be completely removed. By reducing such useless portions, it is possible to reduce the manufacturing cost and the weight of the motor.

Further, if the angle formed by both magnetic pole surfaces of the magnet and the angle formed by both side edges of the cutout of the core steel plate are made the same, even if there is some error in the width of the insertion side end of the magnet, Since the magnetic pole surface of the magnet is in close contact with the side surface of the magnet mounting groove, there is also an effect that a wide tolerance can be taken when designing the core steel plate and the magnet.

[Brief description of drawings]

FIG. 1 is a front view of a core steel plate according to an embodiment of the present invention.

FIG. 2 is an enlarged perspective view of a main part of a stator core formed by using the core steel plate of FIG.

FIG. 3 is a front view of a stator according to the present invention composed of the stator core of FIG.

FIG. 4 is an enlarged front view showing a main part of the stator of FIG. 3, showing a state of magnetic flux.

FIG. 5 is a front view showing a general structure of a conventional stator.

FIG. 6 is a partially enlarged explanatory view of a conventional stator showing a state of magnetic flux.

[Explanation of symbols]

1 ... Core steel plate, 2 ... Central hole, 5 ... Notch, 5a, 5b ...
Side edges, 5c ... Magnetic flux bypass portion, 6 ... Stator core, 7 ... Magnet mounting groove, 7a, 7b ... Side surface, 7c ... Bottom surface, 9 ...
Magnets, 9a, 9b ... Magnetic pole faces, 9c ... Insertion side end,
10 ... Stator, 11 ... Rotor.

Claims (2)

[Scope of utility model registration request] 1. A core steel plate that constitutes a stator core of a stator in a motor by being laminated in a thickness direction, wherein a central hole into which a rotor is inserted and arranged, and an outer edge portion extending radially inward and being laminated. In a core steel plate having a plurality of notches that form a groove for mounting a magnet in a state, both side edges of the notches are formed at a constant angle with respect to each other so that the width of the notches becomes larger toward the outer side in the radial direction. A core steel plate of a stator, which is formed so as to form a magnetic flux bypass portion formed by widening the notch at an end portion on the radially inner side of the notch. 2. A stator core formed by stacking the core steel plates according to claim 1 in a thickness direction, and a magnet inserted into a groove for magnet mounting of the stator core formed by a notch in the core steel plate. And an angle formed by both magnetic pole surfaces of the magnet such that each magnetic pole surface of the magnet is in close contact with a corresponding side surface of the groove and an insertion side end of the magnet is separated from a bottom surface of the groove. A stator having the same angle as the two side edges of the notch of the core steel plate and a width of the insertion side end of the magnet being a predetermined value or more.