JPH048154A - Single-phase cored brushless motor - Google Patents

Abstract

PURPOSE:To facilitate variable speed control by forming one end of the salient pole piece of winding in parallel with the circumferential end of a permanent magnet rotor extending in the axial direction of pole thereby making it possible to rise the rotation with a low voltage. CONSTITUTION:Angular width T of the salient pole piece 15 of a winding salient pole 8 in a stator armature core 7 is set equal to the pole width T of N pole 2N and S pole 2S of a permanent magnet 2, and the other end 15a of the salient pole piece 15 is formed in parallel with the axial direction of the poles 2N, 2S. A skew notched part 21 is provided at the other end 15b of the salient pole piece 15, over 1/4-3/4 pole width from one end of the salient pole piece 15, such that the area facing with the poles 2N, 2S of the permanent magnet rotor 2 of the salient pole piece 15 decreases gradually toward one end of the salient pole piece 15. Consequently, rising of rotation with low voltage is realized, variable speed control is facilitated and a large torque can be obtained.

Description

[Detailed Description of the Invention] [Industrial Application Field of the Invention] The present invention provides a method for slightly changing the shape of a salient pole piece of a winding salient pole of a stator armature core without using any special self-starting processing means. Concerning single-phase brushless motors with iron cores that can be configured to self-start with some effort, they can be started up from low voltages and are extremely easy to control with variable rotation speed, as well as fan motors that require relatively large torque. Suitable for use, the number of windings per wire can be increased, there is no counter torque, the efficiency is good, large torque can be obtained, and assembly is easy.
Concerning things that can be mass-produced at low cost.

[Conventional wave WI] In a brushless motor, the magnetic poles of the permanent magnet rotor, N and S, are detected by a position detection element such as a Hall element, and the signal from the position detection element is input to a transistor, which controls the stator armature. It turns on and off to rotate a permanent magnet rotor.

Here, in a brushless motor, a circuit (drive circuit, electronic commutation circuit or The disadvantage is that it is expensive because it requires as many circuits (also called semiconductor rectifier circuits) as the number of motor phases.

Therefore, it is not cost-effective to use such an expensive brushless motor with a large number of phases in a fan motor or the like that is used for the purpose of simply blowing air and cooling.

For this reason, single-phase brushless motors are used in fan motors, which require only one two-position detection element and a drive circuit for one phase, which can be constructed at low cost.

In this single-phase brushless motor, unless some measure is taken, the torque will be zero in principle at one energization switching point in the normal case. There is a so-called dead center J.

Therefore, in a single-phase brushless motor, in addition to the electromagnetic torque obtained from the armature winding (or the winding salient poles around the armature winding) and the permanent magnet rotor, the cogging torque generated by the cogging torque generating member, etc. The addition prevents the torque at the dead center location from becoming zero, eliminates the stopping phenomenon of the motor at the dead center location, and enables self-starting.

In this way, we solved the problem of dead center and made it possible to start up automatically. In particular, typical conventional methods of iron core type single-phase brushless motors are shown below.Firstly, the most typical one, as in Japanese Patent Publication No. 61-35797, has N-pole and S-pole magnetic poles. The radial length of the salient pole surface is gradually shortened so that the radial gap between the two-pole permanent magnet rotor and the winding salient pole surface of the stator armature facing it is inclined. There is a single-phase brushless motor with an iron core.

As for something similar to this kind of thing, Utility Kai 60-1
No. 28483, JP-A-60-183958, JP-A-6
It is often found in publications such as No. 0-213290 and LISP4°496.887.

An iron-core single-phase brushless motor disclosed in Japanese Patent Application Laid-open No. 147943/1983 is an example of a motor in which a step is formed in the gap without providing an inclination to the gap. This is a pole shoe attached to the inner surface of a part of the magnetic pole of a magnet rotor, and is essentially a stepped part added to the gap. There is also known a single-phase brushless motor with an iron core, disclosed in Japanese Patent Publication No. 10013/1983, in which a gap is stepped by forming a recess in the salient pole of the first winding.

JP-A-61-1 is similar to this type of product.
No. 12561, Utility Model No. 61-478.

Utility Model Application No. 61-84681, JP 61-18340, JP 61-269656, JP 61-2931
No. 48, JP-A No. 62-18958, and many others.

In addition, as a device that can be self-starting by devising the structure of the salient pole, one of the winding salient poles is formed to have a narrow width, as in the iron-core sheep-phase brushless motor disclosed in Japanese Patent Application Laid-Open No. 61-54845. , there is one in which the winding salient pole is deviated to the other wide salient pole side. Similar to this, there is also one in which an auxiliary salient pole is used instead of one narrow winding salient pole. Various types of auxiliary salient poles are known in this case, including those with a winding wound around them and those without one winding around them.

In addition, the main winding salient pole and the auxiliary salient pole are shifted in the circumferential direction and overlapped in two stages in the axial direction, the main winding salient pole and the auxiliary salient pole, and the main winding salient pole and the main winding salient pole. There are different types of salient poles with different areas facing the permanent magnet rotor, or different widths of the armature windings of the main and auxiliary salient poles. . For example, similar to these,
Japanese Unexamined Patent Publication No. 152361/1981, Utility Model No. 46881/1983
No., Utility Model No. 61-46882, Utility Model No. 6146884
No., Japanese Unexamined Patent Publication No. 61-92151, Utility Model Application No. 61-2021
No. 78, Utility Model Publication No. 62-68476, Japanese Patent Application Publication No. 61-81
No. 162, Utility Model No. 61114976, Utility Model No. 53-1
Many such as No. 54312 can be seen.

Next, a typical method for producing a single-phase brushless motor with an iron core that can be started automatically is to use an auxiliary magnet for generating detent torque that magnetically attracts the permanent magnet rotor. For example, USP 4,103,191
A magnet for generating detent torque is used in the magnetic field generated by the permanent magnet rotor, that is, on the salient pole surface that faces the permanent magnet rotor through an air gap, as in the iron core type single-phase brushless motor of No. There is. Other examples that employ this type of method include JP-A-61-161943 and USP 3.
．． No. 43'3,987, Utility Model Publication No. 63-143069,
There is one shown in USP 4,728,833.

Another typical self-startable single-phase brushless motor with an iron core uses an electromagnetic drive system in which an electromagnetic bridge is arranged around the outer periphery of a permanent magnet rotor, as shown in Japanese Patent Laid-Open No. 59-67862. There are iron core single-phase brushless motors, and many of this type are also available.

In addition, so that it can be started automatically,
As seen in No. 473, there are many iron core type single-phase brushless motors with devised cogging torque generating members. For example, similar products of this type include USP 4,40
There are issues such as No. 4,484.

There are also iron-core single-phase brushless motors that can be started automatically by devising the magnetization of the permanent magnet rotor. For example, the width of the magnetic poles of the N and S poles of a permanent magnet rotor is devised, as in the iron core type single-phase brushless motor of US Pat. No. 4,793,203. Another example of a permanent magnet rotor with a different magnetization width is USP 4.
．． 737.674, JP-A-53-23010, JP-A-58-25024, JP-A-58. -95971 etc. can be seen.

In addition, some permanent magnet rotors have been devised so that they can be started automatically by varying the strength of the magnetization. For example, there is a single-phase brushless motor with an iron core in which a portion of the north and south poles of a permanent magnet rotor are more strongly magnetized than other portions.

This kind of magnetization pitch and magnetization pitch are similar to those described in Japanese Patent Application Laid-Open No. 62-1479.
No. 44, JP-A No. 62-173966, U.S. Pat. No. 61-4
No. 1383, Japanese Patent Application Publication No. 5950760, M Publication No. 59-6
No. 7861, JP-A-59-139852, etc.

In addition, as a typical iron core single-phase brushless motor using a substantially non-magnetized part, as in USP 4,115.715, there are NiS poles and 0 poles (non-magnetized poles) between the magnets 4 and 4.
are formed alternately. Examples similar to this include JP-A-62-152362 and JP-A-60-46.
No. 634, JP-A-53-23008, JP-A-5734
No. 761, JP-A-56-81071, etc.

[Problems with the Prior Art] First, in the conventional method of forming an inclination in the gap and in the iron core type single-phase brushless motor and similar devices in which the gap is stepped, the radial length of the gap increases. The drawback is that large torque cannot be obtained and the efficiency is very low.

In addition, a method in which the opening angle width of the winding salient pole including other auxiliary salient poles adjacent to the winding salient pole is narrowed and the winding salient pole is deflected to one winding salient pole narrows the width of the first winding salient pole. Therefore, it is difficult to wind one winding, and the nine auxiliary salient poles cause eddy current loss, resulting in poor efficiency, and the cogging torque generated by the auxiliary salient poles is large, making it difficult to rotate smoothly.

Further, in the case where the winding salient pole and the other winding salient poles are integrally formed in the radial direction, the slot width for winding the armature winding between the nine winding salient poles becomes narrow.

In particular, when the structure is designed to obtain large torque by forming a large number of salient poles, it is difficult to mass-produce it, and it is also inferior in terms of mass-production and efficiency, such as the inability to wind the armature winding with many turns. However, it has the disadvantage that large torque cannot be obtained.

Additionally, those that use cogging torque and those that can self-start using a different detent torque have different magnetic attraction forces and are used for different purposes, so it is generally difficult to compare the two. Can not. Therefore, the two problems to be solved by the present invention are different from the prior art.

Iron-core single-phase brushless motors that use electromagnets to enable self-starting have the drawbacks of complex structures, poor mass production, and high costs. Particularly in this case, if one attempts to construct something that requires a relatively large torque, the above-mentioned drawbacks will be further exacerbated.

A cogging torque generating member is disposed at the lower end of a permanent magnet rotor (not shown) located on the outer periphery of a salient pole piece, and the leakage magnetic flux of the permanent magnet rotor is utilized. is ideal for small items,
In cases where a relatively large torque is required and there are many salient poles, the magnetic attraction between the salient poles of the first winding and the permanent magnet rotor, or the leakage magnetic flux of the permanent magnet rotor. Since the magnetic attraction force between the cogging torque generating member and the cogging torque generating member is larger than that of the cogging torque generating member, there is a possibility that it is not sufficient to cause safe and reliable self-starting.

In addition, other iron-core brushless morphs that resemble heads have similar or additional drawbacks.

Next, there are iron-core single-phase brushless motors in which the N and S poles of the permanent magnet rotor have different magnetization widths.

Since it is not self-starting using cogging torque, it has the advantage of being able to rotate smoothly. However, there is a drawback that large torque cannot be obtained.

In addition, it is difficult to magnetize the iron-core type brushless motor, which has a permanent magnet rotor with varying degrees of magnetization, and is not suitable for mass production. , I had the pity of not being able to launch it safely and reliably.

[Problem to be solved by the invention] The present invention is capable of creating an elliptical structure capable of self-starting by simply devising the shape of the salient pole piece of the winding salient pole of the stator armature core without using any special self-starting processing means. Moreover, it can be started up from a particularly low voltage, making it extremely easy to control the rotational speed, and it can also generate a relatively large torque, has good efficiency, and is easy to assemble. The objective was to obtain a single-phase rotary steel motor with an iron core that could be mass-produced at low cost.

[Means for solving the problems of the invention] The present invention has been made to solve the problems of the conventional iron-core type single-phase brushless motor described above. This can be achieved by providing an iron core type single-phase brushless motor characterized by comprising the following.

Component ■, N pole, sfi! The magnetic poles of 2P (P
is an integer of 1 or more).

Component ①: Winding salient poles with salient pole pieces formed with an opening angle width of approximately one magnetic pole width of the permanent magnet rotor through a radial gap with the permanent magnet rotor are placed at appropriate locations in the same phase position. (m is an integer greater than or equal to 1) stay armature iron core formed by winding armature windings around arbitrary k (k is an integer greater than or equal to 1, and 6 m) winding salient poles. A stator armature of the structure is provided and is arranged so as to rotate relative to the permanent magnet rotor.

Component (2): The permanent magnet rotor is formed so that the opening angle of the magnetic poles of the N and S poles is formed to have an opening angle width that almost matches the opening angle width of the salient pole piece of the winding salient pole.

Component ■: The other end of the salient pole piece of the winding salient pole is an end parallel to the circumferential end extending in the axial direction of the N pole and S pole of the permanent magnet rotor. It is formed like this.

Component ①; One end of the salient pole piece of the above-mentioned wire-wound salient pole extends over an angle θ of 1/4 to 3/4 magnetic pole width from the one end, and the angle θ is gradually increased from the position of θ to the one end. The salient pole pieces are formed so that the facing area with the magnetic poles of the north and south poles of the permanent magnet rotor is reduced.

[Operation of the invention] Winding salient poles 88 (8
-1, ・ ・ , 8-6.81, ..., 8'-6)
The other end 15a, 15''a of the salient pole piece 15.1'5° is the N pole of the permanent magnet rotor 2, 2, the S pole magnet i2N, 2S, the N pole, the S pole permanent magnet 2'N, Since it is formed to be parallel to the end extending in the axial direction of 2°S, the other end 15a, 15'a of the salient pole piece 15. N-pole, S-pole magnetic pole 2N 2S, N
8ii, S [! When passing through the permanent magnets 2'N and 2°S, a large cogging torque is generated to ensure self-starting.
5b, 15'b are skew-shaped notches 21, 21' that are skewed with respect to the axial direction, so cogging torque is generated smoothly and smooth rotation is possible, making it possible to One end 15b, 15°b of the salient pole piece 15.15' has a skew-shaped notch 21°21°.
Therefore, the salient pole piece 15.15' and the magnetic poles 2N, 2S of N pole and S pole, and the permanent magnets 2'N, 2' of N pole and S pole
A larger cogging torque is generated at the opposing position where a strong magnetic attraction force with S is generated than at other parts.

For this reason, when no power is applied, the permanent magnet rotor 2.2 is always
' is stopped at a position where it can start automatically, avoiding the dead center position.

For this reason, the rotation can be started with a low voltage when energized once at startup), and the permanent magnet rotor 2.2
The rotor 16 having a rotation angle 16 is automatically started and rotates in a predetermined direction. During rotation, the break in the electromagnetic torque generated by energizing the 9 groups of armature windings, that is, the dead center, is located at the N pole of the permanent magnet rotor 2, 2゛, and the magnetic pole 2N of the S pole. .

2S, N pole, S pole permanent magnets 2°N, 2°S and salient pole piece 1
Since the cogging torque caused by the magnetic attraction force due to 5, 15 degrees occurs.

- Rotational torque is generated at any point during rotation. As a result, since rotational torque is generated at any point during rotation, continuous rotation can be continued.

In addition, cogging torque is generated by providing a dedicated cogging torque generating member.

Each magnetic pole 2N2S of the driving permanent magnet rotor 2, 2°, the salient pole piece 15 of the winding salient pole 8.8' around which the armature winding 9 facing the permanent magnet 2°N, 2"S is wound. .15' has a skew-shaped notch 21 at one end so that it can be activated automatically as described above.
, 21°, so the cogging torque for self-starting is gradually generated naturally, so no special parts are required.
Iron-core single-phase brushless motor that can be self-started at low cost 1.
1′, 1゛° can be formed.

[Embodiments of the Invention] [First Embodiment of the Invention] Fig. 1 is an exploded perspective view of a core type single-phase brushless motor 1 of the present invention, Fig. 2 is a vertical r-plane view of the same, and Fig. 3 is an exploded perspective view of the single-phase brushless motor 1 of the present invention. A correspondence diagram between the stator armature core 7 and the permanent magnet rotor 2 used in the single-phase brushless motor 1, FIG.
FIG. 5 is a developed diagram showing the relationship between the single-phase brushless motor 1 and the permanent magnet rotor 2 when no current is applied. FIG. An embodiment of the present invention will be described below with reference to FIGS. 1 to 5, which are developed views showing the relationship with the permanent magnet rotor 2. FIG.

The fixing plate 3 has a hair ring house 4 integrally formed in its center with the same member. A rotating shaft 5 is located at the center of the outer periphery of the bearing house 4 formed on the upper part of the fixed plate 3.
A stator armature core 7, which includes a slanted through hole 6 through which the stator armature can be rotated, is fixed. Hall bearings 10. ．． 11, and rotatably supports the rotary shaft 5 by the ball hair ring F0.11. Bearing house 4 above
The six winding protrusions 18 of the one-stage armature core 7 are attached to the outer periphery of the
-1. . . . , armature winding 9-1 for each of 8-6
．． ..., stator armature 1 formed by winding 9-6
2 is fixed by appropriate means.

The stator armature 12 is disposed opposite to the annular permanent magnet rotor 2 fixed to the inner periphery of an annular rotor yoke 14 through a fine radial gap 13 so as to rotate relative to the annular permanent magnet rotor 2. ing.

The stator armature core 7 is made of laminated steel, and is fixed to the outer periphery of the bearing house 4, and includes six T-shaped winding salient poles 8 extending radially at equal intervals in the radial outward direction.
is formed. The winding salient pole 8 has an N-pole magnetic pole 2N forming the permanent magnet rotor 2 at the outer peripheral tip in the radial direction.
, a salient pole piece 15 is formed that faces the S-pole magnetic pole 2S with a radial gap 13 interposed therebetween. The winding salient poles 8 are designed to form an iron core type single-phase brushless motor 1 which is highly efficient and can obtain a large torque without receiving two counter-torques.

The opening angle of the salient pole piece 15 is the N pole 2N of the permanent magnet rotor 2.
The opening angle width is approximately equal to the width (T) of one magnetic pole of the S pole 2S. In the iron-core type single-phase brushless motor 1 of this embodiment, an annular magnet member 23 is pinched at approximately 60 degrees on the inner surface of the cup-shaped rotor yoke 14 fixed to the four-rotation shaft 5 to make the T width [55 degrees]. magnetized N
One rotor 16 is formed by fixing a six-pole annular permanent magnet rotor 2 having magnetic poles 2N and S poles 2S alternately and equally spaced apart. 7 N & 2N and S of the annular permanent magnet rotor 2
A portion indicated by the symbol O between the poles 2S indicates a zero pole (non-magnetized portion or substantially non-magnetized portion) 24.

Therefore, the opening angle width of the salient pole piece 15 is 1 of the permanent magnet rotor 2.
When the magnetic pole width is T width, the opening angle width of approximately T is equal to it [
55°]. The wire-wound salient pole 8 having the salient pole piece 15 formed to have an opening angle width of approximately T width has six wire-wound salient poles 8 arranged at equal intervals so as to be in the same phase position and to have a single-phase arrangement. -1..., forming 8-6. Six winding salient poles 8-1. ..., 8-6 each has an armature winding 9
-1. ..., 9-6 is wound.

As shown in FIGS. 4 and 5, one terminal 9-1a of the armature winding 9-1 and the other terminal 9-2 of the armature winding 9-2
b. Electric advance volume! One terminal 9-3a of armature winding 9-3, the other terminal 9-4b of armature winding 9-4, one terminal 9-5a of armature winding 9-5, and the other terminal of armature winding 9-6. terminal 9 of
-6b are connected in series and connected to the semiconductor rectifier circuit 16.

The other terminal 9-1b of the armature winding 9-1, the armature winding 9
-2 one terminal 9-28. The other terminal 9-3b of the armature winding 9-3, one terminal 9-4a of the armature winding 9-4
, the other terminal 9-5b of the armature winding 9-5 and one terminal 9-6a of the armature winding 9-6 are connected in series and connected to the semiconductor rectifier circuit 17, respectively. A magnetoelectric conversion element 20 such as a Hall element or Hall IC used as a position detection element is arranged at an appropriate position on the upper surface of a circuit mounting board 19 fixed to the upper part of the fixed plate 3 using screws 18. This allows the magnetic poles of the N pole 2N and S pole 2S of the permanent magnet rotor 2 to have a product ratio. This magnetoelectric conversion element 20 needs to be disposed at a desired position, for example, below the other end (other end 15a) of the salient pole piece 15 of the single winding salient pole 8-1.

A semiconductor rectifier 17 is provided on the upper part of the circuit wiring board 19.
has been set up.

In FIGS. 4 and 5, 22-1 is a positive power supply terminal;
22-2 indicates a negative power supply terminal.

Iron core type single-phase brushless motor formed in this way
Although it is a sheep-phase brushless motor, in order to enable self-starting rotation and continuous rotation without using special self-starting processing means, the winding salient poles 8 (81, 81, ... 8-6) salient pole piece 15 (151,
..., 15-6> are formed as follows.

First, as a first condition, the opening angle width (T) of the salient pole piece 15 of the winding salient pole 8 is the N pole 2N and S pole 2S of the permanent magnet rotor 2.
The second condition is that the other end 15a of the salient pole piece 15 is an end that is parallel to the magnetic poles 2N and 2S in the axial direction. and as a third condition, one end portion 15b of the salient pole piece 15 spans an angle θ of 1/4 to 3/4 magnetic pole width from one end of the magnetic pole piece 15, and one end from the angular position of θ. The N pole 2N of the permanent magnet rotor 2 of the salient pole piece 15 gradually increases as
, having a skew-shaped notch 21 formed by cutting out diagonally so that the facing area with the magnetic pole of the S pole 2S is reduced.

Desirably, the opening angle θ of the skewed notch 21 is approximately T/2 degrees [27.5 degrees].

The skew-shaped notch 21 having the width θ is arranged such that the area facing the magnetic poles 2N and 2S becomes smaller as the one end 15b of the salient pole piece 15 reaches the upper part in the axial direction. What is formed is a magnetoelectric conversion element 20
This is so that the magnetic poles 2N and 2S can be detected.

According to the iron core type single-phase brushless motor 1 equipped with the permanent magnet rotor 2 having the salient pole piece 15 in which such a skew-shaped notch 21 is formed at one end 15b of the salient pole piece 15, when no current is applied, the magnetic pole 2N and 2S stop in the state shown in FIG.

That is, this is because the salient pole piece 15 and the portions of the magnetic poles 2N and 2S having a large magnetic area stop at magnetically stable positions. When stopped in this stable state, as is clear from the state shown in FIG.
[Or, it has detected 28 magnetic poles and is in a state where it can self-start and generate rotational torque.

Therefore, referring to FIG. 4, if power is supplied to the known semiconductor rectifier 17 through power terminals 221 and 222, a signal detecting the Ni magnetic pole 2N is output from the output terminal of the magnetoelectric conversion element 20. The transistor in the known semiconductor rectifier 17 can be started up and operated from a low voltage, and the armature winding 9-1.・ , 9-6
As shown in the figure, current flows through the group and the two winding salient poles 8-1
．． Due to the repulsion/attraction phenomenon between the magnetic poles and the permanent magnet rotor 2 occurring at 8-6, rotational torque in the direction of arrow F is generated, and the rotor 16 having the permanent magnet rotor 2 rotates in the same direction. When the rotor 16 rotates a little in the direction of arrow F, the maximum rotational torque is generated as shown in FIG.
rotates in the direction of arrow F. After this, although there is a dead center position where one rotation torque is not generated, the first rotor 16 rotates in the direction of arrow F due to inertia, and cogging torque is generated again as shown in Fig. 4, allowing it to start automatically. So 1
Rotational torque is generated and the 9 rotor 16 continues to rotate.

[Second Embodiment of the Invention] FIG. 6 is an exploded perspective view of an iron core type single-phase brushless motor 1' showing a second embodiment of the invention, in which the iron core type single-phase brushless motor 1 of the first embodiment and The only difference is that permanent magnet rotor 2 is used instead of permanent magnet rotor 2.

Therefore, in the following, only the permanent magnet rotor 2° will be explained.

This permanent magnet rotor 2' is different from an integral type permanent magnet rotor 2 in which an annular magnet member 23 is magnetized with N poles 2N and S poles 2S. are permanent magnets 2' forming N and S magnetic poles, respectively.
The permanent magnets 2''N and 2°S are alternately fixed to the inner surface of the rotor yoke 14 by adhesive or other means.

Although this permanent magnet rotor 2' has more parts than the permanent magnet rotor 2.

Since the material cost is low, as long as an automatic machine is available, it is possible to form the permanent magnet rotor 2 at a lower cost than the permanent magnet rotor 2 described above.

[Third Embodiment of the Invention No. 7 (71 is an exploded perspective view of the iron core type single-phase brushless smoke 1'' showing the third embodiment of the invention, and the iron core type single-phase brushless motor of the second embodiment) The difference from 1° is that instead of 1 winding salient pole 8 (8-1, ..., 86), winding salient pole 8 ° (
8'-1...8"-6) to form a salient pole piece of 15° (15
1,..., 15°-6).

Therefore, in the following, only the stator armature core 7° having the winding salient poles 8° forming the stator armature 12° will be described.

This stator armature core 7' is a stator armature core 7'.
Although it has a similar shape, a salient pole piece 15° (15' -L
..., 15"-6〉.

The salient pole pieces 15 (15-1, . . . , 15-6) are formed differently from each other.

That is, in the case of the above salient pole pieces 15 (15-1 15-6), they are integrally formed by laminating them using laminated steel sheets with different lengths in the circumferential direction, but this can be easily done using an automatic machine. However, if produced without using an automatic machine,
The formation of the layers becomes troublesome.

Therefore, the salient pole piece 45 (15"-1,
..., 15' to 6), one end 15'b corresponding to one end 15b of the salient pole piece 15 is not formed of one laminated steel plate, and the remaining protrusion including the other end 15'a is Pole piece 15°
A wire-wound salient pole 8' having C is integrally formed with laminated steel, and a salient pole piece 15'' made of iron powder-containing resin or magnetic material is formed on one end side surface of the remaining salient pole piece 15''C. One end 15 for
Fix ``b'' by appropriate means.

When the salient pole piece 15' is formed in this way, a skew-shaped notch 21'' similar to the skew-shaped notch 21 described above is formed at one end 15'.
It is very easy to form a wire-wound salient pole 8° having a salient pole piece 15' having one end 1a'b having the skewed notch 21°.

[Effects of the Invention] The present invention allows a large torque to be obtained by simply slightly changing the shape of the salient pole piece of the winding salient pole without providing a new and separate cogging torque generating member. It can generate cogging torque large enough to enable self-starting, and since there is a skew-shaped notch in one part, cogging torque and electromagnetic torque can be generated smoothly, allowing smooth rotation. □It is possible to easily form a single-phase brushless motor with a single iron core, which is suitable for variable speed control and can be started up and operated from a low voltage. .

Of course, unlike 1 or more, there is no increase in the number of parts.

In other words, the number of parts is small, so one assembly is easy.
It has the advantage of being able to be constructed at low cost and with high reliability.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of an iron core type single-phase brushless motor showing a first embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the same, and Fig. 3 is a stator armature core used in the same single-phase brushless motor. Fig. 4 is an exploded view showing the relationship between the single-phase brushless motor and the permanent magnet rotor when the same single-phase brushless motor is not energized, and Fig. 5 is a corresponding diagram of the same single-phase brushless motor and the permanent magnet rotor. An exploded view showing the relationship between the single-phase brushless motor and the permanent magnet rotor when the motor generates maximum starting torque, and FIG. 6 is an exploded perspective view of the iron-core single-phase brushless motor showing a second embodiment of the present invention. , and FIG. 7 is an exploded perspective view of a single-phase brushless motor with a core according to a third embodiment of the present invention. [Description of symbols: 1.1', 1"... Iron core type single phase brushless motor, 2,2°... Permanent magnet rotor. 2N... N pole magnetic pole, 2S... S pole magnetic pole 2”N・
...N pole permanent magnet, 2's...S pole permanent magnet, 3
... Fixed plate, 4... Bearing house, 5... Rotating shaft, 6... Through hole. 7.7 ...Stator armature core. 8.8-1.・・ , 8-6, 8° , 8゛1, ・
..., 8-6. - Winding salient pole 9.9-1.・ ・, 9-6 ・ Armature winding. 10.11... Ring the ball. 12.12 - Stator armature, 13 air gap, 14
...Rotor yoke 15.15~1. ..., 15-6 1515 -1.
..., 15°-6... salient pole piece. 15a, 15a...Other end 15b, 15°b...One end, 16...Rotor, 1
7... Semiconductor rectifier circuit, 18... Screw, 19...
Circuit wiring board, 20... magnetoelectric conversion element, 21.21'
...skewed notch. 22-1... Positive side power supply terminal, 22-2... Negative side power supply terminal, 23... Annular magnet member 24... 0 pole (non-magnetized part or substantially non-magnetized part). Figure 3 Figure 3

Claims (1)

[Scope of Claims] An iron core type single-phase brushless motor characterized by comprising the following components 1 to 5. 1 Equipped with a permanent magnet rotor having 2P (P is an integer greater than or equal to 1) magnetic poles of N and S poles alternately. 2. A wire-wound salient pole having a salient pole piece formed with an opening angle width of approximately one magnetic pole width of the permanent magnet rotor through a radial air gap with the permanent magnet rotor is placed at an appropriate location in the same phase position m (m is (integer greater than or equal to 1)
A stator armature with a single-phase structure is provided by winding armature windings around arbitrary k (k is an integer of 1 or more, K≦m) winding salient poles of a stator armature iron core. , the stator armature is arranged to rotate relative to the permanent magnet rotor; 3. In the permanent magnet rotor, the opening angle of one of the north and south poles is formed to have an opening angle width that substantially matches the opening angle width of the salient pole piece of the winding salient pole. 4 The salient pole pieces of the above-mentioned winding salient poles are formed such that the other end thereof is an end parallel to the circumferential end extending in the axial direction of the N pole and S pole of the permanent magnet rotor. Doing things. 5 The salient pole piece of the above-mentioned wire-wound salient pole has one end extending over an angle θ of 1/4 to 3/4 magnetic pole width from the one end, and the salient pole piece gradually extends from the θ position to the one end. The above-mentioned permanent magnet rotor is formed so that the area facing the magnetic poles of the N and S poles is reduced.