JPH02214455A - Core type single phase brushless motor - Google Patents

Abstract

PURPOSE:To stop at a position except the position of a dead point and to self- start by electrification for rotation by disposing reluctance torque generating member elements of a reluctance torque generating member at suitable positions between winding salient poles. CONSTITUTION:In order to self-start by generating reluctance torque, reluctance torque generating member elements 28a of a reluctance torque generating mem ber 28 made of a magnetic material formed by suitable means such as punching of an iron plate are inserted and disposed between winding salient poles 44. The member 28 is integrally formed by bending and extending axially, i.e., perpendicularly to the outer surface of a ringlike member 28b. Six elements 28a are formed at equal intervals to be disposed in the same phase.

Description

[Detailed Description of the Invention] [Industrial Application Field of the Invention] The present invention relates to a self-startable iron core type single-phase brushless motor, and is particularly suitable for fan motors that require relatively large torque. It relates to something that can be produced in large numbers, does not produce counter-torque, has good efficiency, can obtain a large torque, is easy to assemble, and can be mass-produced at low cost.

[Prior art] In a brushless motor, the magnetic poles of a magnetic rotor (a rotor with permanent magnets with N and S poles, referred to as a permanent magnet rotor) having magnetic poles of N and S poles are detected by a Hall element, etc. The sensor detects the magnet, inputs the signal to the transistor, turns the stator armature on and off, and rotates the magnet rotor.

Here, in a brushless motor, a circuit (drive circuit) is used to switch and energize the armature windings by using a position detection element such as a pole element to switch the magnetic poles of the N and S poles of the magnet rotor.

Since an electronic commutation circuit (also called a semiconductor rectification circuit) is required for each phase of the motor, it has the disadvantage of being expensive.

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 position detection element and one phase drive circuit, and can be constructed at low cost.

This single-phase brushless motor has zero torque at one energization switching point. There is a so-called "dead point".

Therefore, in a single-phase brushless motor, in addition to the electromagnetic torque obtained by the armature winding (or the salient pole wound around the armature winding) and the magnet rotor, the reluctance torque generated by the reluctance torque generating member is generated. By adding this, it is possible to prevent the torque at the dead point from becoming O, eliminate the stopping phenomenon of the motor, and enable 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 single-phase brushless motors are shown below.Firstly, the most typical one is the N
f! , a two-pole magnet rotor 1 having an S magnetic pole,
The radial direction of the salient pole pieces 4 is made such that the radial gap 5 between the salient pole pieces 4 of the winding salient pole 3 around which the armature winding 7 of the stator armature 2 facing this is wound is inclined. There is an iron core type single-phase brushless motor 6 whose length is gradually shortened. Note that 12 indicates a position detection element.

As for something similar to this kind of thing, Utility Kai 60-1
No. 28483, JP-A-60-183958, JP-A-6
0-213290, USP No. 4°496.887, etc.

An iron-core single-phase brushless motor 8 shown in FIG. 10 of JP-A-62-147943 is an example of a motor in which a step is formed in the gaps without providing an inclination in the gaps 5. This is a ball shoe 9 attached to the inner surface of a part of the magnetic pole of the magnet rotor 1, which essentially creates an air gap 5.
with a step added to it. In addition, there is a recess 10 in the salient pole 3 of the first winding.
There is also known an iron core type single-phase brushless motor 11 of Japanese Patent Publication No. 39-10013 shown in FIG. 11 in which the gap 5 is stepped by forming a step.

JP-A-61-1 is similar to this type of product.
No. 12561, No. 1984-478, No. 1984-84
No. 681, JP-A-61-18340, JP-A-61-2
69656 No. 1 JP-A-61293148, JP-A-62
-18958 and many others.

In addition, as a device that can be activated automatically by devising the structure of the salient pole, there is a Japanese Patent Application Publication No. 61-5484 shown in Fig. 12.
There is a type of single-phase brushless motor 13 of iron core type No. 5 in which one of the single-winding salient poles 3 is formed to have a narrow width and is shifted toward the other wide-width salient pole 3. Something similar to this.

Some use auxiliary salient poles instead of narrow winding salient poles. Various types of auxiliary salient poles are known in this case, including those with a winding wound around them and those without two windings. 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 magnet rotor, or different widths of the armature windings of the main and auxiliary salient poles. For example, examples similar to these include JP-A No. 62-152361, JP-A-6146881, JP-A-61-46882, JP-A-61-46884, JP-A-61-92151, No. 61-202178, Japanese Utility Model Application No. 62-68476, Japanese Patent Application No. 61-81162
No., Utility Model No. 61-114976, Utility Model No. 53-154
Many such as No. 312 can be seen.

Next, a typical method for producing a self-startable iron-core single-phase brushless motor is to use an auxiliary magnet for generating detent torque that magnetically attracts the magnet rotor.

Examples of this type include 1, for example, the U shown in Figure 13.
In the magnetic field generated by the magnet rotor 1, like the iron core type single-phase brushless motor 14 of SP4, 103, 191.

That is, there is one in which a detent torque generating magnet 16 is used on the surface of the salient pole 15 that faces the magnet rotor 1 with the gap 5 interposed therebetween. Other examples that employ this type of method include JP-A-61-161943 and USP 3,433,9.
No. 87, Utility Model No. 63-143069, USP 4,72
There is one shown in No. 8,833.

Next, as another typical self-startable single-phase brushless motor with an iron core, an electromagnetic structure 17 is attached to the outer periphery of the magnet rotor 1, as shown in Japanese Patent Laid-Open No. 59-67862 in FIG.
There is an electromagnet-driven single-phase brushless motor 18 with an iron core, and many motors of this type are also available.

In addition, there are many iron core type single-phase brushless morphs 20 in which the reluctance torque generating member 19 is devised as shown in Japanese Utility Model Application No. 62-81473 shown in FIG. 15 so as to be able to start automatically.

For example, similar ones of this kind include usp4.4
No. 04,484, etc.

There are also iron-core single-phase brushless motors that can self-start by devising the magnetization of the magnet rotor.For example, USP 4,793.203 shown in Figure 16
Like the iron-core single-phase brushless motor 21 of No. 2, the width of the magnetic poles of the Ni and S poles of the magnet rotor 2 has been devised. Other examples of magnet rotors 1 with different magnetization widths include US Pat. No. 4,737,674;
Examples include JP-A No. 53-23010, JP-A No. 58-25024, and JP-A No. 58-95971.

In addition, some devices have been devised to magnetize the magnet rotor 1 so that it can start automatically by making a difference in the strength of magnetization. For example, as shown in FIG. There is a single-phase brushless motor 22 with an iron core that is more strongly magnetized than other parts. Similar examples of this type of magnetization peak and magnetization pitch include JP-A-62-147944 and JP-A-62-1.
No. 73966, Utility Model Application No. 61-41383, Japanese Patent Application Publication No. 1983
-50760, JP-A-59-67861, JP-A-5
No. 9-139852, etc.

Further, as a typical iron core type single-phase brushless motor 23 using a substantially non-magnetized part, USP4 shown in FIG.
As in No. 115,715, the magnetic rotor 1 has an N pole,
S poles and 0 poles (non-magnetized poles) are alternately formed.

Similar to this, JP-A No. 62-15236
No. 2, Special Publication No. 60-46634, Japanese Patent Publication No. 53-230
No. 08, JP-A-57-34761, JP-A-56-81
There are issues such as No. 071.

[Problems with the prior art] First, the conventional method of forming an inclination in the gap 5 shown in FIG. 9, and the iron core type single-phase brushless motor 6.8.11 in which a step is created in the gap 5 shown in FIG. However, since the length of the gap 5 in the radial direction increases, a large torque cannot be obtained and the efficiency is extremely low.

Further, as shown in the iron core type single-phase brushless motor 13 in FIG. 12, the opening angle width of the winding salient pole 3 including other auxiliary salient poles adjacent to the winding salient pole 3 is formed narrow.

The method of deflecting the winding salient pole to the one winding salient pole has the disadvantage that the width of the first winding salient pole 3 becomes narrower, so that one reaction torque is generated, resulting in poor efficiency. Further, since the winding salient pole 3 and the other winding salient pole 3 which are deviated are integrally formed in the radial direction, the winding salient pole f! The slot width for winding the armature winding 7 between 3 becomes narrower,
In particular, when the structure is designed to obtain a large torque by forming a large number of salient poles, it is difficult to produce it, and the armature winding 7 cannot be wound with a large number of turns, resulting in problems in mass production and efficiency. However, it has the disadvantage that it is inferior and cannot obtain large torque.

The iron-core single-phase brushless motor 14 shown in FIG. 13 and similar motors utilize detent torque, which is different from that which utilizes reluctance torque, and are both capable of self-starting. , because their magnetic attraction forces are different and the purpose of use is different, therefore it is generally not possible to compare the two, and therefore they are separated from the prior art which the present invention is trying to solve - as shown in Figure 14. The iron-core single-phase brushless motor 18, which can be self-started using an electromagnet, has a disadvantage that it has a complicated structure, is not suitable for mass production, and is expensive. Especially in this case.

The above-mentioned drawbacks will be further exacerbated if one is constructed that requires a relatively large torque.

The iron core type single-phase brushless motor 20 in which the reluctance torque generating member of FIG. 15 is devised is disclosed by the present applicant and is very useful. However, this brushless motor 20 utilizes leakage magnetic flux leaking to the lower end of a magnet rotor (not shown) located on the outer periphery of the salient pole pieces 4, and is not optimal for small-sized motors with relatively low torque. However, in cases where relatively large torque is required and there are many winding salient poles 3, the magnetic attractive force between the winding salient poles 3 and the magnet rotor 1 Since the magnetic attraction force between the leakage magnetic flux and the reluctance torque generating member 19 is greater than the magnetic attraction force between the reluctance torque generating member 19 and the reluctance torque generating member 19, there is a fear that it may not be sufficient to cause safe and reliable self-starting.

Other iron core type brushless motors similar to the brushless motor 20 also have the same drawbacks or have one or more drawbacks.

Next, the iron-core single-phase brushless motor 21 shown in FIG. 16, in which the N and S poles of the magnet rotor 1 have different magnetization widths, has been proposed by the applicant. It has the advantage of being able to rotate smoothly because it is not designed to start automatically. However, the problem is that the manufacturing method is complicated. Others similar to this have similar drawbacks, but depending on the structure adopted, such a magnet rotor 1
In a sense, the method of differentiating the magnetization widths of the N and S poles is as follows:
Since the principle is similar to that of the brushless motor 23 in which substantially non-magnetized poles are formed on the magnet rotor 1 of FIG. 18, there is a drawback that it becomes an inefficient iron core type single-phase brushless motor.

In addition, for the iron core type single-phase brushless motor 22 shown in FIG. 17, in which the strength of magnetization of the magnet rotor 1 is formed, it is difficult to attach the magnetization, and it is difficult to set the magnetization strength of the magnet rotor 1 in order to prevent it from being mass-produced. Depending on the attachment, there was a risk that safe and reliable self-starting would not be possible.

[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. A wire-wound salient pole with an opening angle of a salient pole piece having a width 2n-1 times the width of one magnetic pole of the permanent magnet rotor (n is an integer of 1 or more) is placed at an appropriate location in the same phase position through a gap in the direction. (m
The stator armature is formed by winding armature windings around any k (k is an integer of 1 or more, K≦m) winding salient poles of the stator armature iron core formed (k is an integer of 1 or more, K≦m). The opening angle in the circumferential direction of the reluctance torque generating member formed separately from the stator armature core is electrical angle θ (however, θ is 0<θ
〈90°) width, and at an appropriate position between the winding salient poles, the electrical angle θα from the winding salient poles to the rotational direction side of the permanent magnet rotor (where θα is 0 and θα<90' By extending and fixing the motor in the axial direction at a position offset by an angle of .

[Operation of the invention] Due to the presence of the reluctance torque generating member element of the reluctance torque generating member, a permanent magnet rotor (hereinafter referred to as a magnet rotor) is generated between the width of the first winding salient pole and the reluctance torque generating member element. When the magnetic rotor is not energized, it is placed in a position where it can self-start, avoiding the dead center position, where the magnetic attraction force of the first winding completely matches the width of the salient pole of the first winding and the width of the N or S pole of the magnet rotor. Since it is stopped, the magnetic rotor automatically starts and rotates in a predetermined direction whenever the power is turned on while waiting for startup. During rotation, the electromagnetic torque generated by energizing the converter winding, that is, the dead center position, is caused by the magnetic attraction force between the reluctance torque generating member element and the magnet rotor. Since reluctance torque is generated, rotational torque is generated at any point during one rotation, so continuous rotation can be continued.

In addition, since the reluctance torque generating member is formed separately from the stator armature core, after winding the armature winding around the first winding salient pole, the reluctance torque generating member is placed at an appropriate position 1 between the first winding salient poles. Since the reluctance torque generating member element can be inserted and arranged between the pole pieces very easily from the axial direction, it is possible to wind the armature winding with many turns without interfering with the production of two windings. can.

[Embodiments of the Invention] Fig. 1 is an exploded perspective view of the iron core type single-phase brushless motor 24 of the present invention, Fig. 2 is a sectional view along the same line, and Fig. 3 is a stator electric machine used in the single-phase brushless motor 24. A plan view of the child core 27, FIG. 4 shows the winding salient poles 4 of the stator armature core 27.
5 is an explanatory diagram of the case where the reluctance torque generating member 28 is attached between the salient pole pieces 48 of the stator armature core 27. FIG. FIG. 6 is a top perspective view of the main parts of the iron core type single-phase brushless motor 24 of the present invention.

FIG. 7 is a developed view of the magnet rotor 29 and stator armature 30, and FIG. 8 is a drive circuit diagram as an example.
An embodiment of the present invention will be described with reference to FIGS. 1 to 8.

Note that the iron core type single-phase brushless motor 2 shown in this embodiment
4 depicts a drawing considering application to a fan motor.

The fixed substrate 26 has a bearing house 25 integrally formed with the same member, for example, resin, in the center thereof. A cylindrical body 33 for supporting and fixing the stator armature formed of resin or iron powder-containing resin and having a through hole 32 through the center of which the rotary shaft 31 is rotatably passed is mounted on the upper part of the fixed base plate 26 by screws 36. Fixed. The cylindrical body 33 has a bearing house storage recess 37 formed at its bottom, and four bearing house storage parts 38 formed at its top to accommodate a bearing 39.

A bearing 40 is provided on the inner periphery of the bearing house 25.
The bearing 40 and the bearing 39 rotatably support a rotating shaft 31 fixed to a boss portion 43 of a cup-shaped rotor yoke 42 constituting a rotor 41. Note that the cylindrical body 33 has a hollow interior,
It is very convenient to house and arrange the semiconductor rectifier circuit in this cavity. A stator armature 30 formed by winding an armature winding 45 around a winding salient pole 44 of a stator armature core 27 is fixed to the outer periphery of the cylindrical body 33 by appropriate means. are disposed opposite to the cylindrical magnet rotor 29 fixed to the inner periphery of the rotor yoke 42 through a fine radial gap 34 so as to rotate relative to the cylindrical magnet rotor 29 .

The stator armature core 27 is made of laminated steel, and has six T-shaped winding projections i44 extending in the radial direction at equal intervals on the outer periphery of one cylindrical portion 46. Winding salient pole 4
4 is a winding part 47 formed at equal intervals on the outer periphery of the cylindrical part 46 and facing two magnet rotors integrally formed at the tip of the radial outer periphery with a radial gap 34 interposed therebetween. It consists of a salient pole piece 48. Winding protrusion 8i44
3 In order to form a single-phase brushless motor 24 with an iron core that can obtain large torque without introducing counter torque and has a high efficiency, the magnetic pole piece 48 must be connected to the north pole and the south pole of the magnet rotor 29.
In the iron core type single-phase brushless motor 24 of this embodiment, which is preferably formed with an opening angle width of 20-1 times the width of one magnetic pole (n is an integer of 1 or more), the inner surface of the rotor yoke 42 is A 12-pole magnetometer 29 having alternating north and south magnetic poles is used. Therefore, the width of each of the N and S poles is 30° in mechanical angle and 180° in electrical angle. Therefore, in this embodiment, in the 2n-1 formula, n-1 is selected so that as many armature windings as possible can be wound, and the opening angle width of the salient pole piece 48 is Magnet rotor 29
1 magnetic pole width, i.e. 1 mechanical angle is 30°, electrical angle is 18°
It is formed to have an opening angle width of 0°. The wire-wound salient poles 44 formed with such an opening angle width are arranged at equal intervals on the cylindrical portion 46 at the same phase position on the outer periphery, and have an angle of 30° in mechanical angle and 180° in electrical angle.
Every other six winding salient poles 44-1. ..., 44-6
is formed. Six winding salient poles 44-1.・ ・
, 44-6 each have two armature windings 45a-1 and 45b1.45a-2 and 45b-245a-3 and 45b.
-3, 45a-4 and 45b-4, 45a-5 and 45b-
5, 45a-6 and 45b-6 are bifilar-wound. As shown in FIGS. 7 and 8, armature windings 45a-1, 45a-2, 45a-3, 45a-4, 4
5a-5 and 45a-6 are connected in series and both ends are connected to the semiconductor rectifier circuit 35, and the armature winding 45b-14
5b-245b-3, 45b-4, 45b5 and 45b
-6 are connected in series, respectively, and both ends are connected to the semiconductor rectifier circuit 35. 49-1 is the positive power supply terminal, 49-2
indicates the negative power supply terminal. As shown in FIGS. 1, 4 to 6, the iron core type single-phase brushless motor 24 of the present invention
In order to generate reluctance torque and enable self-starting, the reluctance torque generating member element 28a of the reluctance torque generating member 28 made of a magnetic material formed by an appropriate method such as punching an iron plate is wound. It is inserted between the wire protrusions i44.

The reluctance torque generating member 28, which will be described in more detail below, is a reluctance torque generating member element 28a formed integrally with the outer periphery of a ring-shaped member 28b by extending and bending in the axial direction, that is, in the right angle direction. Six pieces are formed at equal intervals so that they are in the same phase position. The reluctance torque generating member element 28a is 2
The opening angle in the circumferential direction is the electrical angle θ (however, θ is O〈θ〉90
°) is formed into a wide one. That is, the reluctance torque generating member element 28a is formed to have a width in which the opening angle in one circumferential direction is less than or equal to 90” in electrical angle or less than 15° in mechanical angle. The desired circumferential opening angle width of 28a is a position deviated from one side surface of the salient pole piece 48 by a quarter of the magnetic pole width in the circumferential direction in a direction opposite to the rotational direction of the rotor 41; That is, 1 mechanical angle is 7.5 degrees, and electrical angle is 45 degrees.
One side surface of the reluctance torque generating member element 28a is located at a position shifted in the circumferential direction by an angle of Located at a position that is offset by one third of the magnetic pole width in the circumferential direction in the opposite direction to the rotation direction, that is, at a position that is offset by an angle of 10' in mechanical angle and 60° in electrical angle in the circumferential direction. An angle width of θ that satisfies the above conditions is selected so as to satisfy the above conditions.

As is clear from the above, the reluctance torque generating member 28 is the reluctance torque generating member element 2.
8a is offset from the winding salient poles 44 at appropriate positions between the winding salient poles 44 toward the rotational direction side of the magnet rotor 29 by an electrical angle of θα (where θα is 0<θα<90°). The ring-shaped member 28b is attached to the stator armature 3 so that the ring-shaped member 28b is disposed so as to extend in the axial direction at a position where the
0 is fixed to the fixed substrate 26 with screws 49. Note that the reluctance torque generating member element 28a
Even if it is located between the first winding salient poles 44, it is preferably located between the salient pole pieces 48 as described above so as not to function as an obstruction to the armature winding 45, as shown in the embodiment. The reluctance torque generating member 28 is fixed to the fixed substrate 26 with the screws 49 as described above.

By doing this, the armature winding 4 is attached to the winding protrusion 8i44 in advance.
After winding the armature winding 45, the reluctance torque generating member element 28a extending in the axial direction can be inserted and fixed in the above position without colliding with the armature winding 45.

Note that the reluctance torque generating member element 28a
are open at their axial ends, so in order to increase their strength, their upper ends should be connected and fixed to each other using appropriate members to create a solid structure with sufficient strength and reluctance torque. The generating member 28 can be configured. In addition, since the six reluctance torque generating member elements 28a are formed in the same phase position, the reluctance torque generated by forming the six reluctance torque generating member elements 28a, which is the same number as the number of two-winding salient poles 44, is In order to facilitate the arrangement of the 1-position detection element 59 without using the generation member 28, one or more reluctance torque generation member elements 28a at appropriate positions may be omitted in consideration of the specifications. As 50, a Hall element, a ball IC, a magnetoelectric transducer, or any other appropriate element may be used, and in this embodiment.

As shown in FIG. 8, a four-terminal pole element is used. The l detection element 50 is arranged and fixed on the fixed substrate 26 side by appropriate means (not shown) at an appropriate position near the lower ends of the two magnet rotors. Furthermore, since the winding salient poles 44 are also in the same phase position, the six winding salient poles 4
An appropriate number of one or more winding salient poles 44 at appropriate positions of 4-1, ..., 44-6 may be omitted;
One or more of the armature windings 45 may be omitted. Furthermore, between the first winding salient poles 44, the magnet rotor 29
A wire-wound salient pole 44 with an opening angle of the salient pole piece 48 formed to have a width 2n-1 times the width of one magnetic pole (n is an integer of 2 or more) is placed at an appropriate location in the same phase position m (m is an integer of 1 or more) They may be formed individually, and the opening angle width of the salient pole pieces 48 does not necessarily have to be the same as the width of one magnetic pole of the magnet rotor 29.

With reference to FIGS. 7 and 8, armature winding 45a-1,
45a-2, 45a-3, 45a-4, 45a-5 and 45a-6 are connected in series, one end of which is connected to the terminal 51 of the semiconductor rectifier circuit 35, the other end is connected to the terminal 52, and the armature Winding wires 45b-1, 45b-2, 45b-3,
45b4, 45b-5 and 45b-6 are connected in series, one end of which is connected to the terminal 53 of the semiconductor rectifier circuit 35, and the other end connected to the terminal 54. Terminal 52 is connected to a Darlington connected amplifier circuit consisting of transistors 55 and 56, and terminal 54 is connected to transistors 57 and 5.
The positive power supply terminal of the 0 position detection element 50 connected to the Darlington-connected amplifier circuit consisting of 8 is connected to the positive power supply side via a resistor 59.
One output terminal 68 of the zero position detection element 50 has a negative power supply terminal connected to the ground 61 via a resistor 60, and a transistor 62. Transistor 5 via resistor 63
5 and the base of transistor 62 . Ground 61 side and transistor 56.5 via resistor 64
The other output terminal 69 of the 0 position sensing element 50 connected to the emitter of the transistor 65. It is connected to the base of transistor 57 via a resistor 67, and also connected to the base of transistor 65. A resistor 66 is connected to the ground 61 side and to the emitters of transistors 56 and 58.

When the position detection element 50 detects Ni in the magnet rotor 29, the potential of the output terminal 68 of the first position detection element 50 becomes high level, and the potential of the output terminal 69 becomes low level, so that the transistor 65 becomes conductive. Conversely, when the position detection element 50 detects the S pole of the magnet rotor 29, the signal becomes 1.
The potential of the output terminal 68 of the position sensing element 50 becomes low level.

Since the potential of the six output terminals becomes high level, the transistor 62 becomes conductive. When Totanji Staro 5 conducts,
The base potential of the transistor 57 rises, the transistor 57 becomes conductive, and the transistor 58 also becomes conductive, so that the armature windings 45b-1, 45b-2, 45b-
3, 45b-4, 45b-5 and 45b-6 are energized,
Since torque in a predetermined direction is generated by these armature windings, the two-rotor 41 rotates in a predetermined direction. Further, when the transistor 2 becomes conductive, the base potential of the transistor 55 rises, the transistor 55 becomes conductive, and the transistor 56 also becomes conductive, so that the armature winding 45a is turned on in the activated region.
-1, 45a-2.

45a-3, 45a-4, 45a-5, and 45a-6 are energized in the opposite direction, and torque in a predetermined direction is generated by these armature windings. The two operations allow the single rotor 41 to continue rotating in that direction.

[Effects of the Invention] In the present invention, since the reluctance torque generating member element of the reluctance torque generating member is disposed at an appropriate position between the winding salient poles, the reluctance torque generating member element of the first winding salient pole and the reluctance torque generating member element are disposed at appropriate positions between the winding salient poles. A self-starting position where the magnetic attraction force generated by the magnet rotor completely matches the width of the two winding salient poles and the width of the N or S pole of the magnet rotor, avoiding the dead center position. Since the magnet rotor stops when it is not energized, the magnet rotor automatically starts and rotates in a predetermined direction whenever it is energized at startup. Also, during rotation, the break in the electromagnetic torque generated by energizing the armature winding, that is, the dead center position, is caused by the magnetic attraction force between the reluctance torque generating member element and the magnet rotor. Because reluctance torque is generated, rotational torque is generated at any point during one rotation.

Continuous rotation can be continued. In this way, the iron core type single-phase brushless motor of the present invention is safe even when the opening angle of the salient pole piece and the opening angle width of the magnet rotor are made to match in order to obtain high efficiency and large torque. Moreover, reliable self-starting can be performed. Also, the reluctance torque generating member.

Since it is formed separately from the stator armature core, after winding the armature winding around the salient pole of the first winding, reluctance torque is generated between the salient poles of the first winding and the appropriate position 2. Since component elements can be inserted and arranged very easily from the axial direction, they do not interfere with single winding work or interfere with the armature winding, and armature windings with multiple turns can be used.
Iron-core single-phase brushless motors, which are relatively large and require large torque, can be easily and inexpensively mass-produced.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of the iron core type single-phase brushless motor of the present invention, FIG. 2 is a sectional view of the same edge, FIG. 3 is a plan view of the stator armature core used in the same single-phase brushless motor, and FIG. The figure is an explanatory diagram when a reluctance torque generating member is installed between the salient pole pieces of the winding salient poles of the same stator armature core.
Figure 6 is a top perspective view of the same stator armature core in which a reluctance torque generating member is housed between the salient pole pieces of the winding salient poles, but a magnet rotor is arranged on the outer periphery. FIG. 7 is an exploded view of a magnet rotor and a stator armature, and FIG. 8 is an explanatory diagram of a semiconductor rectifier circuit used in the present invention as an embodiment. 9 to 18 are explanatory diagrams of the principles of various conventionally known single-phase brushless motors. [Explanation of symbols 1... Magnet rotor, 2... Stator armature,
3...Winding salient pole, 4...Salient pole piece. 5... Air gap, 6... Iron core type single phase brushless motor, 7... Armature winding, 8... Iron core type single phase brushless motor, 9... Ball shoe 10... Recessed part , 11
... Iron core type single-phase brushless motor, 12 ... Position detection element. 13.14... Iron core type single phase brushless motor, 15
... Salient pole, 16... Detent torque generation magnet,
17...Electromagnet structure. 18... Iron core type single phase brushless motor. 19... Reluctance torque generating member 20.21, 2
2, 23. 24... Iron core type single phase brushless motor,
25... Bearing house, 26... Fixed board, 2
7... Stator armature core, 28... Reluctance torque generating member, 28a... Reluctance torque generating member element, 28b... Ring-shaped member. 29...Permanent magnet rotor (magnet/rotor), 3
0... Stator armature, 31... Rotating shaft, 32...
- Through hole, 33... Cylindrical body for supporting and fixing stator armature, 34... Gap. 35...Semiconductor rectifier circuit, 36...Screw. 37.38...Bearing house storage recess. 39.40...Bearing, 41...Rotor, 42
...Rotor yoke, 43...Boss part, 44.44-
1. ..., 44-6... winding salient pole, 45.45-
1a, ..., 45a-6, 45-1b, ...
・, 45b-6... Armature winding 146... Cylindrical part, 47... Winding winding part, 48... Salient pole piece, 49
-1...Positive side power supply terminal, 49-2...Negative side power supply terminal. 50...Position detection element. 51,..., 54...terminals. 55,...,58...transistor. 59.60...Resistance, 61...Earth. 62...Transistor, 63.64...Resistor, 65
...Transistor, 66.67...Resistance, 68.6
9...Output terminal. Kabuto 2■ 24; Ari'&tQML Hayabusa Arashishi Smotor z7+Stator Electric Machine+/f&! 26 H Raggunst 1 74! ivF material 264:L
, 1-year-old Element 50 List Jun 1 with Rakutan
Chichibon l Toto 3rd Sekisho S A! FJ+ Figure 6 Figure 8 Dormitory/Figure 4

Claims (3)

[Claims] (1) Rotatably supported magnetic poles of N pole and S pole are 2P
(P is an integer of 1 or more) permanent magnet rotor having a width 2n-1 times the width of one magnetic pole of the permanent magnet rotor through a radial gap with the permanent magnet rotor (n is an integer of 1 or more) ) with the opening angle of the salient pole piece formed at m(
A stator electric machine formed by winding an armature winding around any k (k is an integer of 1 or more, K≦m) winding salient poles of a stator armature iron core (m is an integer of 1 or more). The reluctance torque generating member, which is formed separately from the stator armature core, is arranged so as to rotate relative to the stator armature core, and the opening angle in the circumferential direction is θ in electrical angle (however, θ <90°) width and θα (however, θ
α is a single-phase brushless motor with an iron core extending in the axial direction and fixed at a position offset by an angle of 0<θα<90° or at a position in phase with the position. (2) When two or more reluctance torque generating members are formed between the winding salient poles, the reluctance torque generating members are integrally formed with the same member at the ends in the axial direction. It is fixed at the fixed end in the axial direction,
An iron core type single-phase brushless motor according to claim (1). (3) The above-mentioned wire-wound salient pole is a wire-wound salient pole in which the opening angle of the salient pole pieces facing the permanent magnet rotor through a radial gap is approximately equal to the width of one magnetic pole of the permanent magnet rotor. One-half the number of magnetic poles of the permanent magnet rotor are formed at equal intervals and in the same phase position, and the reluctance torque generating member is arranged so that the reluctance torque generating member is arranged in a rotational direction of the permanent magnet rotor from the winding salient poles equal to the number of the winding salient poles. An iron core type single-phase brushless motor according to claim 1 or 2, which is arranged and fixed at a position offset by an electrical angle θα to the side.