JPH082169B2 - 3 phase iron core type flat semiconductor motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a flattened semiconductor motor having a three-layer 120-degree digital energization method with an iron core.

(Technical background and problems thereof) Conventionally, as flat semiconductor motors, various types of flat-core semiconductor motors have been known. This is because it is suitable for expensive audio equipment and the like because it is a non-iron core type, cogging does not occur, it is flat, and it can be expected to have a long life because it is brushless. By the way, the cogging point is not so problematic, and the iron core type may be used instead of the ironless core type as long as a large torque is required. However, in the case of iron-core semiconductor motors, in the past, most of them are iron-core cylindrical semiconductor motors, although they are close to flat semiconductor motors in terms of overall shape. Therefore, there is a drawback that a flatter semiconductor motor cannot be obtained. Although iron core flat motors are also known, in the conventional one, a disk-shaped laminated steel plate (= stator yoke) is formed, and a large number of slots are formed at equal intervals on the surface of the steel plate facing the magnet rotor. However, the armature coil groups have to be inserted and arranged in the slots so that the armature coil groups are superposed on each other with the phases thereof shifted.
For example, when the magnet rotor has two magnetic poles of N and S, the armature coil has to have a bow-frame shape in which the opening angle of the radial conductor portion that contributes to the generated torque is formed to be 180 degrees. Therefore, the armature coil group had to be superposed. In such an armature coil, since the conductor portion that does not contribute to the generated torque in the circumferential direction (ineffective) occupies more area and amount than the conductor portion in the radial direction, it is difficult to manufacture and it is very expensive. there were. Further, since the armature coils are overlapped several times, it is necessary to make the groove of the slot deep, and it is necessary to make the laminated steel plate forming the stator yoke thick. It was not possible to make the iron core type flat semiconductor stator very thin. Moreover, since the armature coil groups overlap each other several times, the coil end processing of the above-mentioned ineffective conductor part is troublesome, and the mass productivity is not improved. However, it is inconvenient and costly.

As a three-phase iron core type flat semiconductor motor made to solve the above drawbacks, Japanese Utility Model Application No. 58-89912 (Japanese Utility Model Publication No.
No. 9-195972) is disclosed by the person concerned with the applicant of the present application.

In this invention, a magnet rotor having 2P (P is an integer of 2 or more) poles having N and S magnetic poles alternately, and an opening angle of a conductor portion in a radial direction that contributes to generated torque is approximately equal to a magnetic pole width of the magnet rotor. A frame-shaped armature coil group formed equally,
A plurality of salient pole core groups having a shape substantially equal to the shape of the hollow portion in the frame of the armature coil, which is integrally formed with the stator yoke that faces the rotor magnet at alternating equal intervals or is fixedly formed on the fixed side, A stator armature formed by fitting an air-core type armature coil to the salient pole core by arranging the armature coil groups at equal intervals without overlapping each other, and a position detection means are provided. It is an iron core type flat semiconductor motor.

This iron core type flat semiconductor motor is certainly useful.

However, this iron core type flat semiconductor motor is of a three-phase type of a digital or linear 180-degree conduction system.

Comparing the digital 120-degree energization method and the linear 180-degree energization method, the former method has the merit that it can be formed at low cost, but the torque ripple becomes large, and not only smooth rotation but also high-speed rotation is not possible. Makes a loud rotating sound in the ears. However, although the latter method is more expensive than the former method, it has an advantage that all the drawbacks of the former method can be eliminated.

Due to such a difference in characteristics, when either method is adopted, the latter method which is expensive in terms of performance is adopted.

However, when this linear 180-degree energization method is used, the fact that it becomes expensive is always a bottleneck.

Therefore, the performance is superior to the digital 120 degree energization method,
Moreover, in many cases, it is desired to adopt the digital 120-degree conduction method as a circuit configuration that is cheaper than the linear 180-degree conduction method.

However, depending on the specifications, either the linear 180-degree conduction method or the digital 120-degree conduction method can be used.
It is desirable to be able to form a phased iron core type flat semiconductor motor.

(Problem of the present invention) The present invention provides a conventional linear 180-degree energization type three-phase iron core type flat semiconductor motor by a very easy method at a low cost and good performance. It was made as a subject that it can be changed and configured.

(Means for Achieving the Object of the Present Invention) The object of the present invention is to provide a magnet rotor having 2P (P is an integer of 2 or more) alternating magnetic poles of N and S, and to face the magnet rotor via a gap in the axial direction. The core formed on the fixed side with an opening angle width of 180 degrees or almost 180 degrees protruding in the direction of the magnet rotor is 3n (n is 1
(The above integers) are arranged in three phases so as not to overlap each other, and are formed in a stator yoke, and the core is mounted with an air-core armature coil on the outer periphery to face the magnet rotor in the radial direction of the core. Electricity is provided by arranging the position sensing element at a position separated from the extending end position toward the inside of the core in the circumferential direction by an electrical angle of approximately 30 degrees or at a position separated from that position by an electrical angle of approximately 180 degrees in the circumferential direction. This can be achieved by providing a three-phase iron core type flat semiconductor motor capable of digitally energizing 120 degrees at an angle.

(Embodiment of the Invention) First, the first embodiment of the present invention will be described with reference to FIGS. The first embodiment shows an iron core type flat semiconductor motor in which a stator armature composed of an armature coil group is arranged only on one surface facing the magnet rotor.

FIG. 1 shows the first embodiment of the present invention, where 1 is 2P
(P is an integer of 2 or more) poles, and n (n is an integer of 2 or more) coils in iron core type flat semiconductor motors. In this example, 10 poles, 6
It is a coil. Reference numeral 2 is an iron core type flat semiconductor motor body made of a non-magnetic material, 3 and 4 are bearings, 5 is a rotary shaft rotatably supported by the bearings 3 and 4, and 6 is a rotor yoke fixed to the rotary shaft 5. , 7 is an 8-pole magnet rotor fixed to the lower surface of the rotor yoke 6, 8 is an annular printed circuit board fixed to the main body 2, and 9 is disposed on the lower surface of the printed circuit board 8 by soldering or the like. An electric component for an energization control circuit, 10 is an annular stator yoke fixedly provided on the upper surface of the printed circuit board, 11 is an armature coil wound in a frame shape and arranged on the stator yoke, and 12 Is a stator armature consisting of six armature coils 11 arranged on the stator yoke 10 at equal intervals without overlapping each other, and 13 is substantially the same as the shape of the cavity portion of the armature coil 11 in the frame. Of the iron core, etc. Consisting straight (i.e., are straight protruded magnet rotor 6 side and it is the shape formed by the opening angle width of 180 degrees in electrical angle as described later)
3n (n is an integer of 1 or more) cores (salient pole core) are formed. In this embodiment, n = 2 is selected, that is, six cores 13 are formed. This core 13 has an electrical angle of 180 degrees (or almost 180 degrees), that is, a mechanical angle.
It has an open angle of 36 degrees. Reference numeral 14 is a printed circuit board arranged on the core 13, and 15 is three embedded in the through holes formed in the printed circuit board 14 so that the semiconductor motor 1 is formed as a three-phase type and the magnet rotor 7 leaks. Hall element, Hall IC selected as position detection element to detect magnetic flux
Etc. is a magnetoelectric conversion element.

FIG. 2 is a bottom view of the magnet rotor 7. The magnet rotor 7 is an annular 10-pole magnetized in the thick direction so that N and S magnetic poles are alternately arranged at equal intervals.

FIG. 3 is a plan view of the stator armature 12 fixedly mounted on the stator yoke 10. The armature coil 11 includes conductor portions 11a and 1a that contribute to the generated torque in the radial direction that contributes to the generated torque.
The opening angle with 1b is substantially equal to the magnetic pole width of the magnet rotor 7, that is, it has a fan frame shape formed at 36 degrees. The core 13 is formed by a planar fan-shaped one in which the armature coil 11 substantially corresponds to the formation of the cavity portion in the frame, and may be integrally formed with the stator yoke 10, but here, it is formed separately. The individual cores 13 are fixedly mounted on the stator yoke 10 by means such as sticking. The six armature coil groups 11 do not overlap each other at a pitch of 60 degrees,
A stator armature 12 is formed by being fixedly fitted to the outer circumference of each core 13 so as to be arranged on the stator yoke 10.

Although the printed circuit board 14 is not drawn in FIG. 3, the position where the magnetoelectric conversion element 15 should be disposed on the printed circuit board 14 will be described with reference to FIG.

The magnetoelectric conversion element 15 has an electrical angle of 30 degrees from one end 13a (which may be the other) extending in the radial direction of the core 13,
That is, the enclosure of the angular position of 6.6 degrees away from the end 13a position toward the inner side in the circumferential direction of the core 13 by a mechanical angle.
A printed circuit board 14 facing the position of the core 13 shown by 16 (in this embodiment, since the printed circuit board 14 is disposed on the upper surface of the core 13, the magnetoelectric conversion element 15 is disposed at the position on the surface of this printed circuit board 14). Position (which makes it convenient to install). Alternatively, the core 13 deviated from the position of the enclosure 16 in the circumferential direction by an electrical angle of 180 degrees, that is, a mechanical angle of 36 degrees.
The printed circuit board 14 is disposed on the surface of the core 13 opposite to the position indicated by the enclosure 17 of FIG. Or the above enclosure
When the magnetoelectric conversion element 15 is arranged at a position of the printed circuit board 14 opposite to a position where the electric angle is a.360 degrees (n is an integer greater than or equal to 1), that is, the mechanical angle is n.36 degrees in the circumferential direction from 16,17. Good. If the magnetoelectric conversion element 15 is disposed at such a position, the magnetoelectric conversion element 15 is electrically rotated when the width of one magnetic pole of the N pole or the S pole of the magnet rotor 7 is 180 degrees in electrical angle due to the relative rotation with the magnet rotor 7. Since the next magnetic pole is detected by detecting only the magnetic pole width of the N pole or the S pole of the magnet rotor 7 having a width of 120 degrees in angle, the armature coil 11 has a width of 120 degrees in electrical angle. Since it is energized only for a period of time, the core 13 and armature coil 11 can
Since the electromagnetic torque is generated by the core 13 during the period of 10 degrees, it is possible to easily change the three-phase iron-core semiconductor motor having the same structure as the conventional one to a 120-degree digital energization type motor.

FIG. 4 shows a magnet rotor 7 and six armature coils 11
FIG. 4 is a development view of a stator armature 12 including a group. As is clear from this development view, the armature coil 11 has a conventional iron core type flat plate even if the opening angle between the radial conductor portions 11a and 11b contributing to the generated torque is substantially equal to the magnetic pole width of the magnet rotor 7. It is obvious that the armature coils 11 can be arranged at equal intervals so as not to overlap each other like the semiconductor motor.

Next, with reference to FIG. 5, an iron core type flat semiconductor motor 1'as a second embodiment of the present invention which is more useful than the first embodiment of the present invention will be described. Since the flat semiconductor motor 1'has many parts in common with those of the first embodiment, only the main parts are shown in the drawing, and the description of the common parts is omitted, or the reference numeral with a dash is added. I will use it.

The iron core type flat semiconductor motor 1'of the second embodiment is characterized in that (a) it has a double-sided excitation structure and that only one magnet rotor 7 is used. ) When the magnet rotor 7 is directly connected to the rotary shaft 5, the magnet rotor 7 may be damaged and the life of the magnet rotor 7 may be shortened. (C) The magnet rotor 7 is fixed to the rotary shaft 5. By fixing the magnet rotor support plate 18 to the rotor, it is possible to achieve good dynamic balance of the rotor and to eliminate the harmful effect by directly connecting the magnet rotor 7 to the rotating shaft 5. By using a non-magnetic material such as aluminum or Duracon as the rotor support plate 18, the magnetic flux of the magnet rotor 7 is generated on both upper and lower surfaces thereof, The stator armatures are provided at positions on the upper and lower fixed sides of the bottom rotor 7, respectively, so that a high torque can be obtained with high efficiency.

The iron core type flat semiconductor motor 1'will be described in detail below with reference to FIG. The flat semiconductor motor 1'is of a double-sided type, and the portion indicated by reference numeral A corresponds to the flat semiconductor motor 1 shown in the first embodiment. However, the rotor yoke 6 is replaced by a non-magnetic material such as aluminum. The magnet rotor support plate 18 is used, and the magnet rotor 7 is fixedly mounted on the lower surface thereof. A portion indicated by a symbol B is a newly added portion, and is a printed circuit board 8 and a stator yoke 1 fixedly provided on an inner surface of an upper portion of a motor body (not shown).
By fixing the group of cores 13 'through 0'and fixing the armature coils 11' to the core 13 'in the same manner as described above, the core 13' is fixed to the fixed side facing the upper surface of the magnet rotor support plate 15. Also forms a stator armature 12 '. Since the magnet rotor support plate 15 is a non-magnetic material, the magnetic flux of the magnet rotor 7 also acts on the side of the stator armature 12 ', so that torque can also be obtained by the stator armature 12'.

As is clear from the above configuration, the iron-core flat semiconductor motor of the present invention can obtain a larger torque than that of the iron-free flat semiconductor motor, resulting in high efficiency. Similar to the iron-free core type semiconductor motor, a motor having a small axial thickness can be obtained. Since it is a semiconductor motor, it can be expected to have a long service life. Since the armature coil groups can be arranged at equal intervals without overlapping each other, (a) the configuration is simple, (b) assembly is easy and mass production is possible at low cost. You can get a small radius,
(D) An iron core type flat semiconductor motor with good rotation balance and flat motor characteristics can be obtained. In the case of double-sided type, the magnet rotor is not increased and the stator armature is simply added. Since only one set needs to be increased, a highly efficient iron core type flat semiconductor motor capable of obtaining a large torque having the above-mentioned characteristics can be obtained even though the output torque is doubled.
In addition to the three-layer iron core type semiconductor motor having the above effects (1) to (3), an inexpensive digital 120-degree energization type three-phase iron core type semiconductor motor can be made extremely inexpensive simply by changing the position of the position detection element, that is, the magnetoelectric conversion element. According to the structure of the present invention, the cost of the digital 120-degree energization method can be reduced and the accuracy can be improved without changing the position of the position detecting element, that is, without changing the structure of the main part of the motor. The effect is that the phased iron core type semiconductor motor or the linear 180 degree energization type three phased iron core type semiconductor motor can be easily designed and changed according to the specifications.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of an iron core type flat semiconductor motor according to a first embodiment of the present invention, FIG. 2 is a bottom view of a magnet rotor, and FIG. 3 is a plane of a stator armature fixedly mounted on a stator yoke. 4 and 5 are development views of a magnet rotor and a stator armature including an armature coil group, and FIG.
It is a longitudinal cross-sectional view of the main part of the iron core type flat semiconductor motor of the embodiment. (Explanation of symbols) 1,1 ′ …… Flat core type flat brushless motor with iron core, 2 …… Flat core type flat brushless motor body with iron core, 3,4 …… Bearing, 5 ……
Rotating shaft, 6 ... Stator yoke, 7 ... Magnet rotor, 8,8 '... Printed circuit board, 9 ... Electrical components for energization control circuit, 10,10' ... Stator yoke, 11,11 ... Armature Coil, 12,12 '... Stator armature, 13,13' ... Core, 14 ... Printed circuit board, 15 ... Magnetoelectric conversion element, 16, 17
…… Enclosure, 18 …… Magnet rotor support plate.

Claims (1)

[Claims] 1. A magnet rotor having 2P (P is an integer of 2 or more) alternately having N and S magnetic poles, and protruding in the magnet rotor direction to a fixed side facing the magnet rotor via an axial gap. 180 electrical angle or almost 180
3n core (n is an integer of 1 or more)
The three cores are arranged in three phases so as not to overlap each other, and are formed on a stator yoke, and the core is mounted with an air-core armature coil on the outer periphery so as to face the magnet rotor, and an end position of the core extending in the radial direction. From the position toward the inner side of the core in the circumferential direction at an electrical angle of n · (360 + 30) degrees or at a position distant from the position by an electrical angle of approximately n · (360 + 180) degrees in the circumferential direction. Electrical angle 12
A 3-phase iron core type flat semiconductor motor that can be digitally energized at 0 degrees.