KR0150343B1 - A single-phase brushless motor - Google Patents

Abstract

Even in the case of a single-phase brushless motor, it is possible to rotate magnetically simply by improving a part of the components of the motor even without the installation of expensive magnetic processing means. A part of the stator yoke is cut out in an angular range, a cut piece is formed, and reluctance for generating dead spot escape torque is obtained so that the field magnet is not restrained at the dead spot position by the cut piece.

Description

Single phase brushless motor

1 is an exploded perspective view of a disc-shaped single-phase (DC) brushless fan motor showing an embodiment of the present invention.

2 is a longitudinal cross-sectional view of the X-Y line of the fan motor shown in FIG.

3 is a layout view of a magnetoelectric conversion element.

4 is a plan view of a single-phase coreless stator armature.

5 is a connection diagram between the terminal of the armature coil and the driving circuit (drive circuit integrated circuit) on the lower surface of the printed board.

6 is an exploded view of a field magnet and an armature coil of a single phase arrangement.

7 is a plan view of a single-phase coreless stator armature showing one embodiment of the present invention.

8 is a diagram showing the electromagnetic and synthetic torque curves of a brushless motor.

9 is a structural diagram of a conventional Corees single-phase brushless motor.

* Explanation of symbols for main parts of the drawings

1: Electronic Torque Curve 2: Synthetic Torque Curve

3-1, 3-2: Dead point 4: Reluctance torque curve

5: Field magnet 6, 6-1, 6 ': Stator yoke

7, 7-1, 7 ': single-phase coreless stator armature

8: Axial-gap single phase (DC) brushless fan motor

8 ': single phase brushless motor 9-1, 9-2: armature coil

9a, 9b: Effective conductor part contributing to generated torque

9c, 9d: conductor part not contributing to generated torque

10: Venturi case 11: Rotating fan

12: stay 13: motor storage

14: impeller (rotary wing) 15: wind through hole

16: bearing house 17: ball bearing

18: sleeve bearing 19: rotating shaft

20: stator armature support holder

21, 21-1, 21 ': printed board

22 terminal 23 nonmagnetic screw

24: printed wiring pattern 25: hole

26: notch 27: hole

28: screw hole 29: cutout

30: rotation conversion element

31: drive circuit (power control circuit) IC

32: rotor yoke 33, 33-1: cut pieces

34: double-sided adhesive tape 35: rotating conversion element storage hole

36: axial void 37, 38: wire circumference

38, 40: notch 41: lead

43: PNP transistor 44: NPN transistor

45: PNP transistor 46: NPN transistor

47: + power supply terminal 48:-power supply terminal

49-1, 49-2: Output terminal 50: Virtual center point

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-phase brushless motor capable of self-moving with a simple configuration, and in particular, a DC (direct current) brushless for cooling purposes such as a computer and a switching power supply. Axial fan motor.

BACKGROUND ART In general, brushless motors are widely used in recent years, ranging from DC motors to high speeds, such as large torque and good controllability.

By the way, the two-phase and three-phase are mainly used for the brushless motor, but since the constant of the motor is large, only the number of the constants is used to convert the magnetism into the expensive drive circuit and the position detection element. An element is necessary. Therefore, in the DC axial fan motor for cooling purposes, i.e., for blowing air, it is preferable to use a cheap single-phase DC brushless motor in which both the driving circuit and the rotating converter element are finished in one kind.

However, this single-phase brushless motor has a part where the torque becomes zero (dead spot part), so that the rotor sometimes stops at a dead point position, and thus cannot be operated automatically. When the rotor stops at the dead point position, even if the armature coil is energized, torque cannot be generated by the armature coil, and the magnetoelectric conversion elements used as the position detecting element also have the N pole and S of the magnet of the field magnet. Since the boundary line of the pole is detected, the output signal does not come out of the magnetoelectric conversion element, so that the armature coil cannot be energized by the drive circuit. The above is explained below. Moreover, when referring to the constant of the motor, it cannot simply be determined from the arrangement of the armature coils, but refers to the energization state to the armature coils.

In the single-phase brushless motor, the electromagnetic torque curve 1 obtained by the armature coils when energizing the armature coils is shown as shown in FIG. In FIG. 8, the rotation angle is set on the horizontal side, and the magnitude | size of the torque of a vertical axis | shaft is measured.

Since two-phase brushless motors have two-phase armature coils whose phases are only π / 2 (π is 180 degrees in electrical angle), the two-phase armature coils are energized. The synthesized torque curve at the time of combining the two electromagnetic torque curves obtained by this does not have a dead point position where the torque becomes zero. Therefore, if the two-phase brushless motor is energized, the torque is non-zero at any position during rotation, and thus rotates automatically.

In three-phase brushless motors, since there are three-phase armature coils that are out of phase with each other by π / 3 angles, the torque curve is smoother than that of the two-phase brushless motors. If the brushless motor is energized, it will rotate automatically at any position during rotation.

However, in this single-phase brushless motor, the torque becomes zero at the energization switching point of the armature coil. There is a so-called 'dead spot'. Referring to FIG. 8, in the case of a single-phase brushless motor, the armature coil is in a single phase arrangement, so that the electromagnetic torque curve 1 obtained when the armature coil is energized is at the energization switching point at an angle of 2π. There are two parts of dead points 3-1 and 3-2 with zero torque.

When the field magnet stops at the dead point (3-1, 3-2), the rotating element stops at the position facing the dead point (3-1, 3-2), and the output does not come out of the rotating element. Therefore, since the armature coil is not energized by the drive circuit, even when the single-phase brushless motor is energized, the rotation torque cannot be obtained and the motor is not magnetically operated, which is not suitable for practical use. In addition, when the field magnet is stopped at the dead point position, the rotating converter also faces the dead point (3-1, 3-2) of the field magnet and the position (the boundary between the N pole and the S pole of the field magnet). In this case, the output signal is not output from the magnetoelectric conversion element, and the armature coil is generally configured as if it is not energized. Also, even if the armature coil is energized, it is in a position where torque cannot be generated.

Therefore, the single-phase brushless motor is stopped by adding an electromagnetic torque obtained according to the armature coil and the field magnet, and adding a cogging torque (reluctance torque) to stop the corresponding motor in the dead point portion. It solves the present condition and makes it possible to be self-driving.

An example of this is U.S. Patent 3,873,897. The patent has a radial air gap type iron core cylindrical structure, a stator armature iron core winding a armature coil facing each other by dividing a cylindrical magnet and a radial air gap and facing each other. The voids were machined into a shape in which the inclination was made in the gap length with the iron core pole face of the core, and the structure was complicated. In addition, since the iron core void-type iron core coil wound around the armature coil is complicated, the structure is complicated, expensive, and has a heavy weight defect. In addition, the above structure is a small size suitable for use in a small size such as a pop top computer, which is recently required, and it is difficult to form a thinner and lighter axial fan motor in terms of structure.

Moreover, in order to obtain an ideal torque-rotation angle curve in a magnetically movable single phase brushless motor, it is necessary to obtain a torque curve 2 as shown in FIG.

4 is a reluctance curve for obtaining escape torque at the dead point (3-1, 3-2) positions.

As is apparent from the reluctance torque curve 4 such as the electromagnetic torque curve 1, the reluctance torque is preferably made to be one-half the size of the electromagnetic torque. In this way, a synthetic torque curve 2 is obtained that passes through the entire rotation angle and is made of almost the same rotation torque.

Therefore, in the case of the single-phase brushless motor in which the synthesized torque curve 2 is obtained, even if it is a single phase, there is no dead point where the torque becomes zero when the armature coil is energized, i.e., at start-up, the rotating conversion element is the N pole or S of the field magnet. When the magnetic pole of any of the poles is detected and the armature coil is energized based on the output signal from the magnetoelectric conversion element, a rotational torque in a predetermined direction can be obtained, and the magnetron rotates in a predetermined direction.

The single-phase brushless motor has a coreless structure in addition to the iron core structure described above. As an example, since there is a coreless single-phase brushless motor 8 'having an axial pore-shaped structure shown in FIG. 9, the motor will be described. The pole has a field magnet 5 provided as a rotor for an integer of 1 or more and P = 2 in FIG. 9, which is a 4 pole), and the air gap between the field magnet 5 and the axial direction is divided. N (n is an integer greater than or equal to 1, n = 2 in Fig. 9) armature coils 9-1, 9-2 on the surface of the stator yoke 6 ', which is a single-phase [armature coil 9 -1) and (9-2 are in in-phase position with each other], and the single-phase coreless stator armature 7 'formed and arranged is detected, and the magnetic field of the field magnet 5 is detected and based on the detection signal. Therefore, the structure is provided with one magnetoelectric conversion element for determining the energization direction of the armature coils 9-1 and 9-2. In addition, in Fig. 9, the magnetoelectric conversion element is not drawn as a position detecting element such as magnetic moving processing means for the purpose of causing the single-phase brushless motor 8 'to be magnetically driven due to the drawing. The field magnet 5 described above is a field magnet 5 having four poles, that is, p = 2. Therefore, the field magnet 5 has an annular shape (tele-shaped) of four pole flats, each of which has a 90-degree magnetism axis with the constituent angles of the poles of the N pole and the S pole alternately in the shape of the adjacent poles being different poles. And a rotor yoke provided in the main body portion to which the field magnet 5 of the rotating fan, which is not shown in Fig. 9, made of resin is mounted.

In the case of the related single-phase brushless motor 8 ', where the outer diameter is not increased and the single-phase brushless motor 8' is applied to the axial air gap single-phase (DC) brushless fan motor, Since the outer diameter of the motor excretion portion is limited, the terminals 22 of the armature coils 9-1 and 9-2 are placed along the outer circumference of the printed board 21 'such as the stator yoke 6' and the printed board ( 21 ') is connected to the printed wiring pattern 24 formed on the lower surface of the lower surface by soldering, and can be electrically connected to the electronic components for the driving circuit (drive circuit integrated circuit (IC 31)). There is no drawback.

As described above, the terminal 22 of the armature coils 9-1 and 9-2 is cut off by contacting the motor case and the rotating fan, or the terminal 22 is cut off by the stator yoke 6 '. Etc., there is no space margin around the outer periphery of the printed board 21 '.

In order to eliminate the above drawbacks, an axial air gap type single phase brushless fan motor using the single phase brushless motor 8 'of FIG. 9 is generally provided at the outer periphery of each printed board 21' such as the stator yoke 6 '. Cutouts 26 and 29 are formed, and the terminals 22 of the armature coils 9-1 and 9-2 are disposed on the lower surface of the printed board 21 'with the cutouts 26 and 29 interposed therebetween. Hand solder is applied to the solder 41 by drawing it on the lower printed wiring pattern 24, thereby electrically coupling the terminal 22 and the driving circuit (drive circuit IC 31).

By the said single phase brushless motor 8 ', the said fault can be eliminated. However, the cutout portion 26 formed in the stator yoke 6 'generates positive cogging that performs relative rotation with the field magnet 5. As described above, the single-phase brushless motor is capable of generating magnetic dead center escape reluctance by magnetic transfer processing means (not shown in the drawing) to magnetically rotate. However, the stator yoke 6 ' According to the formation position of the notch 26 formed, the synthetic torque curve which the positive cogging which does not generate | occur | produce by the notch 26 deny the said dead spot escape reluctance torque, and cannot become self-driving. On the contrary, the dead-point escape torque is increased to form a composite torque curve which cannot smoothly rotate, and a single-phase brushless motor 8 'having poor current and vibration characteristics.

The present invention is to improve the stator yoke originally used in a single-phase brushless motor, to generate a magnetic motor (dead spot escape) reluctance torque that can be magnetized sufficiently and appropriately to a suitable position, and the armature thereon. The terminals 22 of the coils 9-1 and 9-2 are guided to the side of the driving circuit (drive circuit IC 31) disposed on the printed board, and the above-described terminals are not formed in the stator yoke without forming the cutouts 26. A good single-phase brushless motor with a motor characteristic that can obtain a magnetic material close to the ideal synthetic torque curve (2) and can be reliably self-dried is thin (in the case of an axial air gap type, in the case of a radial air gap cylindrical shape). It is an object of the present invention to provide a small radius in the radial direction), light weight, excellent mass productivity, and low cost mass production.

In order to achieve the object of the present invention, a stator yoke surface having a magnetic field magnet provided as a rotor having a magnetic pole of the N pole and the S pole with respect to the P pole (P is an integer of 1 or more), and faces the magnet and the gap therebetween. 1 is provided with a single-phase stator armature formed by arranging n (n is an integer of 1 or more) armature coils, and detects a magnetic field of the field magnet and determines the energization direction of the armature coils based on the detected signal. In a single-phase brushless motor having two rotating converters, a part of the stator yoke is cut and formed at an angle range of one-two poles of the field magnet at a dead point, and a piece of cut-off is formed. Dead spot escape torque for preventing the field magnet from being confined at the dead spot One to get the Luck reluctance torque to provide a single-phase brushless motor.

An object of the present invention can be achieved by forming the cut piece at a position about one quarter of the magnetic field magnet from the dead point position.

An object of the present invention can be achieved by forming m (m is an integer of 1 or more) at the stator yoke position at which the cut pieces are in in-phase position.

The object of the present invention can be achieved by forming the cut pieces at a 180 degree symmetrical position.

An object of the present invention can be achieved by forming the cut pieces are stretched in the radial direction about the axis of rotation.

The object of the present invention can be achieved by spreading the cut pieces in a radial direction not centered on the rotation axis.

An object of the present invention is to guide the armature coil of the stator yoke to an unexposed side through a cutout formed by forming the cut-out portion of the terminal of the armature coil, and to form a driving circuit provided on the side. This can be achieved by electrical contact with the component side.

In the non-energized state, the field magnet 5 stops at the position which can magnetically attract, meet, and move magnetically with the cut piece 33. Accordingly, since the magnetoelectric conversion element 30 always detects the N pole or the S pole of the field magnet 5 when energizing, for example, the armature coils 9-1 and 9-2 are assumed to be detecting the N pole. Since the current flows in the predetermined direction, the field magnet 5 is rotated in the predetermined direction. When the field magnet 5 rotates in a predetermined direction, the armature coils 9-1 and 9-2 generate maximum starting torque and rotate in the same direction. When the field magnet 5 rotates and the magneto-electric conversion element 30 detects the S-pole magnetic pole of the field magnet 5, currents in the reverse direction are generated in the armature coils 9-1 and 9-2 and rotated in a predetermined direction. Torque is obtained to further rotate the field magnet 5.

By repeating the above operation, the single phase brushless fan motor 8 continuously rotates. In addition, since the slit-shaped cutouts 39 can be formed in the stator yoke 6 by the cut pieces 33 formed in the stator yoke 6, the cutouts 39 and the like are formed. The terminal 22 of the armature coils 9-1 and 9-2 is sandwiched between the cutout portions 40 formed on the outer circumference of the printed circuit board 21 facing the cutout portion 39. By handing the solder 41 to the printed wiring pattern 24 on the lower surface, the electrical connection between the terminal 22 and the driving circuit (drive circuit IC 31) is facilitated.

1 is an exploded perspective view of an axial air gap type (disc) single phase (DC) brushless fan motor 8 showing the first embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the XY line of the fan motor 8; 3 is a layout view of the excretion position of the magnetoelectric conversion element 30, FIG. 4 is a plan view of the single-phase coreless stator armature, and FIG. 5 is a view showing the terminals 22 of the armature coils 9-1 and 9-2 together with FIG. Connection diagram for guiding the lower surface of the printed board 21 to the driving circuit (IC 31 for the driving circuit), FIG. 6 shows the field magnet 5 and the armature coils 9-1 and 9-2 in a single phase arrangement. It is a figure which shows the developed view of wah. Hereinafter, an axial air gap type single phase brushless motor 8 showing a first embodiment of the present invention will be described with reference to the drawings.

The axial air gap type single-phase brushless fan motor 8, which has a thin axial thickness, has a venturi case 10, which is a stator, and a rotor, which is a rotor. A coreless axial pore type single phase DC brushless axial fan motor having a fan 11 is provided. In the above embodiment, the fan motor 8 has an extremely thin, compact and lightweight flat structure in which the size of the plane is 40 mm x 40 mm in length X side and 10 mm in axial direction. It is.

The fan motor 8 has a convex part therein and a motor accommodating part 13 connected to a stay 12 formed by spreading radially inward on the inner circumference of the venturi case 10. ) Is formed integrally with a resin at the center of the impeller (rotary wing) of the rotating fan 11 on the outer circumference of the motor housing 13 at the bottom of the venturi case 10. A wind through hole 15 is formed to allow the wind blown by the air 14 to pass downward in the axial direction, and 32 denotes a rotor yoke. A shaft connection house (16) is formed integrally in the axial direction, and the bead shaft connection (17) at the upper end of the shaft connection house (16) to the lower end by installing a slip shaft connection (18) to rotate The rotating shaft 19 fixed to the fan 11 is rotated by itself to support the shaft in the shape of operating and rotating As it can rotate the fan 11 and the rotating fan 11 is removed by the field magnet (5), rotating shaft 19, such as the rotor yoke 32 is integrally formed by resin.

The rotating fan 11 is installed in a shape in which the center thereof is located above the shaft connection house 16. Therefore, by installing the bead shaft connection 17 on the upper portion of the shaft connection house 16 to support the connection with the bead shaft connection 17 in the center of the rotating fan 11, the lower end position of the shaft connection house 16 By providing the slip shaft connection 18, the rotating shaft 19 by the said slip shaft connection 18 falls down more than a predetermined angle in the radial direction.

The motor housing portion 13 is integrally formed with resin by a stator armature support post 20 extending in the axial direction at an symmetrical position of 180 degrees. The single-phase coreless stator armature 7 is excreted and fixed on the support 20 in a manner described later. The coreless stator armature 7 in this embodiment is a thin, circular, circular-shaped stator yoke in which an armature coil wiring board is formed (in this embodiment, the stator yoke 6 is an armature coil excrement substrate). The two coreless armature coils 9-1 and 9-2 are disposed in a single phase arrangement in which the two coreless armature coils 9-1 and 9-2 are in phase (as can be in phase conduction).

Perforations 25 formed on the bottom surface of the circular-shaped stator yoke 6 which finishes the path of the field magnet 5 and the perforations formed on the circular-shaped printed [wiring] substrate 21 are formed. ), The printed circuit board 21 is adhesively fixed by using a double-sided adhesive tape to form a single-phase coreless stator armature 7.

Since the coreless armature coils 9-1 and 9-2 form a highly efficient axial void single-phase DC brushless axial fan motor 8, the effective conductor portion 9a which contributes to the generated torque increased in the radial direction. And 9b) have an open axis formed in the same open axis as that of the magnetic pole of the field magnet 5, π (π is 180 degrees in electrical angle), and a single-phase coreless stator. Since the armature 7 is formed, it is attached to the stator yoke 6 surfaces symmetric with each other by 180 degrees.

The coreless armature coil is intended for the purpose of winding the armature coils 9-1 and 9-2, that is, having no core (magnetic material) for winding the conductor. The coreless armature coil can be made of a nonmagnetic material even if the core for winding the conductor is wound. That is, in this case, the magnetic core, such as iron core, is a simple magnetic body that does not have the above-mentioned function because the magnetic core has the function of acting as the north pole or the south pole when the magnetic core is energized to the electric magnetic coils 9-1 and 9-2. Although the armature coils 9-1 and 9-2 are in the armature coils 9-1 and 9-2, they belong to the coreless armature coil.

In addition, the stator yoke 6 has an effective conductor portion that extends in the radial direction of the armature coil 9-1 at a position apart from the perforation 25 in the main direction by a 45 ° angle from the perforation 27 ( A magnetoelectric conversion element accommodation hole 35 for accommodating a magnetoelectric conversion element 30 such as a hall element and a hall IC which functions as a position detection element shown in FIG. 3 at the position of the stator yoke 6 facing 9b). ), And the magnetoelectric conversion element 30 disposed on the upper surface of the printed circuit board 21 is housed in the magnetoelectric conversion element accommodation hole 35 described above. The two positions of the magnetoelectric conversion element accommodation hole 30 at the 180 ° symmetrical stator yoke 6 positions are positive cogging which is not an obstacle caused by the magnetoelectric conversion element accommodation hole 35. This is to offset the generation of the cogging torque and to improve the balance of rotation. Therefore, the magnetoelectric conversion element 30 was not accommodated in one of the magnetoelectric conversion element accommodation holes 35.

The lower surface of the printed circuit board 21 is provided with two ICs 31 for driving circuits (conduction control circuits), and a conductive wiring pattern and lead which are not shown in the drawing formed on the printed circuit board 21 are attached to each other. Is connected and fixed. In addition, in the above embodiment, only one driving circuit IC 31 may be formed. However, two divided circuits are used in such a manner as to be dedicated to other motors.

One magnetoelectric conversion element 30 is disposed on the upper surface, and the printed circuit board 21 having the IC 31 for the energization control circuit is disposed on the upper surface, and two armature coils 9-1 and 9-2 are disposed on the upper surface. The coreless stator armature 7 is formed by fixing an adhesive to the lower surface of the stator yoke 6 to be removed, and the coreless stator armature 7 extends in the radial direction in the axial direction 36. The magnetic field magnets are face-to-face as if they are rotated relative to the field magnets 5 of a 4-pole flat with alternating magnets of the N and S poles alternately fixed to the rotating fan 11. In the magnetic field of 5), the coreless stator armature 7 of the single phase arrangement such as the magnetoelectric conversion element 30 is arranged.

Wedge-shaped stator yoke 6 which ends the magnetic path of the magnet 5 with a screw 23 which can be made of non-magnetic material such as column, aluminum, resin material, etc. [In this embodiment, the stator yoke ( 6) is made of an armature coil excrement board], such as the perforation 25 formed in the armature coil excrement substrate, the screw of the top of the strut 20 between the perforations 27 formed in the circular-shaped printed [wiring] substrate 21 therebetween. A screw is inserted into the hole 28 and the stator armature 7 is disposed on and fixed on the support 20 to fix the coreless armature 7 in the single phase arrangement in the magnetic field of the field magnet 5.

The perforations 25 formed in the stator yoke 6 do not cancel dead point escape reluctance torque obtained by the magnetic copper processing means described later, and generate torque of the electric magnets 9-1 and 9-2. In the effective conductor part 9a which contributes to the direction, it forms in the position twisted in the main direction by the angle of 45 degree toward anti-arrow direction A. As shown to FIG. The formation of the perforations 25 in such a position does not generate static cogging torque which becomes an obstacle generated by the related lead holes 25.

It is possible to use magnetic screws such as iron screws in place of the non-magnetic screws 23.

In the single-phase brushless motor, if the magnetic copper processing means is not provided, the single-phase brushless motor sometimes stops at the dead points 3-1 and 3-2. At this time, the magnetoelectric conversion element 30 is the field magnet 5. Since the non-stimulation portion is detected between the N pole magnetic poles and the S pole magnetic poles, the output signal does not come out of the magnetoelectric conversion element 30. In addition, since the rotating torque cannot be generated even when the electric coils 9-1 and 9-2 are energized themselves, the single-phase brushless motor does not operate even when the electric coils 9-1 and 9-2 are energized. Does not have the drawbacks.

As a result of the above drawback, in the single-phase brushless motor, the magnetic field magnet 5 is surely magnetic if the electric field coils 9-1 and 9-2 are energized regardless of the stop position of the field magnet 5 (rotary fan 11). It must be as if it is rotating. That is, in FIG. 8, which is the energization switching point of the armature coils 9-1 and 9-2, the so-called dead points 3-1 and 3-2 in which the torque becomes zero in the electromagnetic torque curve 1 are shown. ), The dead spot escape torque must be obtained so that the field magnet 5 is not restrained at the dead spots 3-1 and 3-2.

Therefore, since the single-phase brushless fan motor 8 has a single-phase energizing structure, since it can be formed at low cost, it is necessary to make a magnetic copper processing means for the purpose of obtaining a pre-escape torque. Throw it away.

Therefore, in the single-phase brushless fan motor 8 of the above embodiment, the stator yoke 6 that originally constitutes the stator armature 7 as a means for obtaining dead spot escape torque is improved to serve as a magnetic copper processing means for the stator yoke 6. I have a form to have.

That is, in the present invention, a part of the stator yoke 6 is positioned at a position within a range of an angle (45 degrees) that is 1/2 the magnetic pole of the field magnet 5 from the dead point 3-1, 3-2 position. Since the field magnets 5 formed by the cut-out pieces 33 as the corresponding magnetic copper processing means are not restrained at the dead points 3-1 and 3-2. It is supposed to obtain the reluctance torque of the deadline escape torque.

In the single-phase brushless fan motor of the above embodiment, the direction of rotation of the field magnet 5 and that of the field magnet 5 at the position of the conductor portion 9a contributing to the generated torque of the armature coils 9-1 and 9-2, and Cuts a part of the stator yoke 6 at the position of a quarter pole of the field magnet 5 (22.5 degrees) toward the inverse anti-arrow A direction and cuts off the cut piece 33 Formed and shaped to obtain reluctance torque for dead-spot escape torque for the purpose of making the field magnet 5 unconstrained at dead spots (3-1, 3-2) by means of the cut pieces (33). I am doing it.

When the cut pieces 33 formed at the above positions are formed, as shown in FIG. 6, the magnetic field magnets 5 shown in dotted lines and the armature coils 9-1 and 9-2 are shown in a correspondence relationship. The display field magnet 5 stops at the position where the cut pieces 33 are magnetically balanced with the magnetic pole center portion of the north pole or the south pole of the field magnet 5.

Since the armature coils 9-1 and 9-2 are disposed at positions twisted in the circumferential direction by a quarter magnetic pole angle in the cut pieces 33, the magneto-electric conversion element 30 is surely a magnetic field magnet. The N pole or the S pole stimulation of (5) can be detected, i.e., since the magnetoelectric conversion element 30 does not face dead centers 3-1 and 3-2, the armature coils 9-1 and 9 -2) also exists at a position where torque can be generated, an output signal is obtained from the magnetoelectric conversion element 30, and the signal can be energized to armature coils 9-1 and 9-2, and the armature By the coils 9-1 and 9-2, the rotational torque in the display A direction can be obtained, and the field magnet 5 can be rotated in the display A direction.

The two pieces of the sculpture 33 are placed at 180 degrees symmetrical in symmetrical position, which reduces the mechanical rotational vibration and makes the rotation fan 11 smooth and quiet, and also obtains a large reluctance torque for dead spot escape. It is the purpose to make the shape to be able to rotate, but it is good just to make one place.

Furthermore, the conductor portions 9c and 9d in the main direction in the armature coils 9-1 and 9-2 are conductor portions which do not contribute to the generated torque, and the conductor portions which contribute to the generation of torque are the conductors that extend in the radial direction. Since it is 9a, 9b, the said cut-up piece in the position separated in the main direction toward the anti-arrow A direction by the said angle (22.5 degree from a machine angle) with respect to the said conductor part 9a. (33), but the cut pieces 33 and the in-phase position differ from the cut pieces 33 and 38 in the related positions 37 and 38 because the dotted line circumferences 37 and 38 are shown in FIG. 33) may be formed, but one or more locations at the frostbite position may be selected and cut to form a sculpture 33.

However, the dotted line 37, 38 positions are at the inner positions of the armature coils 9-1, 9-2, and these positions are cut off because they obtain a magnetically operated reluctance torque of such a size that can be reliably magnetized. Since the upright piece 33 cannot be formed by extending it in the radial direction, in the above embodiment, the upset piece 33 is formed at the stator yoke 6 position described above.

Since the cut pieces 33 are shaped to be able to move magnetically and at the same time to obtain a reluctance torque for self-magnification of sufficient size, the boundary between the N-pole and the S-pole magnetic pole of the field magnet 5 and It is formed in the shape of passing relatively in parallel.

That is, in the said embodiment, the cut piece 33 is extended and formed in the radial direction centering on the rotating shaft 19, and is formed. The length in the radial direction and the height in the axial direction of the cut pieces 33, that is, the number to be formed are appropriately selected in accordance with the specifications of the single-phase brushless fan motor 8.

The position where the cut pieces 33 are formed is the angle of the quarter stimulus axis (22.5 degrees from the machine angle) at the position where the maximum torque of the electromagnetic torque curve 2 of the shape apparent in Figs. 1, 2, and 4 is obtained. The reluctance torque for dead-spot escape by the piece 33 cut | disconnected at the position which fell in the main direction toward the anti-arrow A direction by this generate | occur | produces, and arrange | positions it in the position where the reluctance torque curve 4 is obtained. Most preferably, in the above embodiment, the pieces 33 cut and formed at positions corresponding to such conditions are formed.

Moreover, the convex center part of the electromagnetic torque curve 1 obtained by energizing the electric coils 9-1 and 9-2 is the position where the largest electromagnetic torque is obtained, and this part is the electric coil ( The positions of the effective conductor portions 9a or 9b contributing to the generated torque of 9-1 and 9-2. Although the dead point escape reluctance occurs in the portions 9a or 9b, it may cause such an illusion to obtain the reluctance torque curve 4.

However, the position includes an effective conductor portion 9a or 9b which is based on the generated torque of the armature coils 9-1 and 9-2, and the cut pieces 33 cannot be formed. The part concerned may be at a position extremely close to the dead point (3-1, 3-2) position, and the single-phase disc-shaped brushless fan motor 8 may not be able to move automatically. ).

Moreover, the cut pieces 33 are the energizing switching points of the armature coils 9-1 and 9-2, and 0 θ π / 2 (π is 180 degrees at an electric angle at positions of dead centers 3-1 and 3-2). In the case of using the magnetic field magnet 5 having a four degree angle and four poles, a cut piece 33 for the purpose of obtaining dead spot escape torque is formed at the position θ of the machine angle of 80 degrees = π). The magnet 5 may obtain an escape torque that is not restrained at the dead points 3-1 and 3-2.

In the single-phase coreless stator, the slit-shaped cutout portion is formed in the stator yoke 6 by the cut pieces 33 formed in the stator yoke 6 as shown in FIG. Since the cutouts 39 can be formed, the cutouts 39 and the like can be formed by various kinds of spaces that do not conform to the outer periphery of the printed board 21 facing the cutouts 39. The conventional defects that occur are eliminated, and since they pass through the terminal 22, it is possible to prevent the generation of static cogging torques by preventing the cutouts that could not be achieved unless they are formed in the stator yoke 6. Blocking.

6 is an exploded view of the field magnet 5 and the armature coils 9-1 and 9-2 in a single phase arrangement, and the armature coils 9-1 and 9-2 are formed of an effective conductor portion 9a contributing to the generated torque. 9b), the angular width of the field magnet 5 is formed at the angular width of the field magnet 5 at the angular width of the field magnet 5 (90 degrees as the mechanical angle and 180 degrees as the electrical angle). Therefore, it becomes clear that it is arrange | positioned at equal interval arrangement of 180 degree pitch.

The terminal 22 of the effective conductor portion 9a, which contributes to the generated torque of the armature coil 9-1, is constituted by two driving circuit ICs 31. The semiconductor rectifier (drive circuit current) And the collector circuit of the PNP transistor 43 of the PNP type transistor 42 and the collector circuit of the NPN transistor 44 are electrically connected to each other. The terminal 22 of the effective conductor portion 9b, which contributes to the generation torque in the other direction of the armature coil 9-2, is the collector circuit of the PNP transistor 45 in the semiconductor stop 42 and the NPN transistor 46. Is connected to the collector circuit.

The terminal of the effective conductor portion 9b contributing to the generating torque in the other direction of the armature coil 9-1 and the terminal of the conductor portion 9a contributing to the normal generating torque of the armature coil 9-2 are electrically connected. You are connected to The emitter circuits of the transistors 37 and 45 are electrically connected, and are electrically connected to the + power supply terminal 47 side.

The emitter circuits of the transistors 44 and 46 are electrically connected, and are electrically connected to the negative side power supply terminal 48 side. The base circuits of the transistors 43 and 46 are electrically connected and electrically connected to the ordinary output terminal 49-1 side of the magnetoelectric conversion element (in this case, a four-terminal Hall element). It connects and electrically connects the same thing as the base circuit of the transistors 44 and 45, and is electrically connected to the output terminal 49-2 side of the magnetoelectric conversion element 30 in the other direction.

In Fig. 6, the field magnet 5 shown by the dotted line shows the state in which the field magnet 5 is stopped when the piece 33 and the field magnet 5 are electrically attracted to each other and stably meet. Although the position of the field magnet 5 is obvious in the development view of FIG. 6, the brushless fan is certainly because the magneto-electric conversion element 30 is in a state of detecting the magnetic pole of the N pole or the S pole of the field magnet 5 necessarily. The motor 8 can be moved by itself.

Therefore, referring to FIG. 6, since the magneto-electric conversion element 30 detects the magnetic pole of the N pole of the field magnet 5 shown by the dotted line, the transistor 43 and the output terminal 49-1 are usually interposed therebetween. Since the electric power of 46 is supplied to the armature coils 9-1 and 9-2, and the rotating torque in the direction of the arrow is obtained, the field magnet 5 (rotating fan 11) is arrowed. It can rotate in A direction.

If the magnetic field magnet 5 (rotating fan 11) rotates in the direction of arrow A, about one quarter of the magnetic poles, the electric magnetic coils 9-1 and 9-2 are the magnetic field magnets 5 shown in solid lines in FIG. To generate maximum starting torque. If the initial starting torque is generated at first, the loss at the start is actually deteriorated. However, if the field magnet 5 improves by the quarter stimulus angle, the maximum starting torque is generated. There is no loss of time, and the single-phase brushless fan motor 8 with high efficiency can be obtained.

After the maximum starting torque is obtained, the field magnet 5 further rotates, and the magneto-electric conversion element 30 detects the S-pole magnetic pole of the field magnet 5, with the output terminal 49-2 in the other direction interposed therebetween. By energizing (44) and (45) and passing a reverse current through the armature coils 9-1 and 9-2, the rotation torque in the direction of the arrow A is obtained. (11)] further rotates in the direction of the arrow (A). By repeating the above operation, the single phase brushless fan motor 8 continuously rotates.

7 shows a plan view of the single-phase coreless stator armature 7-1 used in the disc type brushless fan motor 8 of the second embodiment of the present invention.

In the single-phase coreless stator armature 7-1, the pieces 33-1 cut out as the magnetic copper processing means formed on the stator yoke 21-1 are the pieces of cut pieces 33 in the first embodiment. It is not formed along the virtual center line 18 having the rotation axis 19 as the center point in the shape, and is not formed as a straight point along the virtual center line 18 from which the rotation axis 19 serving as the center point is removed. The arbitrary points of the virtual center line 50 from which () were removed were made to extend in the radial direction as a reference center point. That is, the cut pieces 33-1 are formed to be inclined by an angle facing the cut pieces 33. As shown in FIG.

As seen from the cut piece 33-1, the cut piece 33-1 is formed unfolded at a position not through the rotation shaft 19, that is, the cut piece 33-1 has a field magnet ( 5) Reluctance torque for dead-spot escape occurs smoothly because it is relatively inclined, facing and passing through the stimulus boundary part between N pole stimulus and S pole stimulus of 5). The single-phase brushless fan motor 8 of the die can be configured.

In particular, it is preferable to use such cut pieces 33-1 such as the single-phase brushless fan motor 8 having a small 40-square size.

Although the example which used two armature coils in the said Example is shown, if the single phase coreless stator armature can be formed, the number may be one, or three or more. For example, in the case where the four-pole magnetic field magnet 5 is used, up to four armature coils 9 overlap each other and can be designed in the in-phase position. In this case, the armature coil 9 is preferably formed in a shape in which the open angle of the outer circumferential portion between the effective conductor portions 9a and 9b is set within the magnetic pole width of the field magnet 5.

In addition, although the field magnet uses four poles, two poles may be used. However, in the case of a small single-phase brushless fan motor, when a two-pole field magnet is used, the armature coil cannot be formed in an optimal shape, and only a small number can be disposed, and when a six-pole or more field magnet is used, It is certainly possible to install a large number of armature coils. However, if the diameter of the motor is small, it is cumbersome to manufacture an armature coil. Therefore, as in the above embodiment, it is preferable to use four-pole magnets. In the case of a small brushless fan motor, since the rotating fan is also small, sufficient torque can be obtained by using two armature coils.

Moreover, although demonstrated centering on the single-phase brushless motor of an axial pore-type structure, it goes without saying that the technical idea of this invention may be extended to the single-phase brushless motor of a cylindrical radial pore-type structure. In this case, the cut pieces are formed so as to protrude in the radial direction such as the inner diameter direction.

The present invention is solved by a slight improvement, such as improving a part of the stator yoke portion material originally used for a single-phase brush motor, and it is possible to obtain a magnetic material close to an ideal synthetic torque curve, and to be able to magnetically reliably. Therefore, it is extremely easy to obtain a single-phase brushless motor that can be mass-produced with excellent mass production and at low cost.

In addition, since the cut pieces formed on the stator yoke can be formed into cutouts formed in the stator yoke 6, the cutouts and the cutouts formed on the outer periphery of the printed circuit board facing the cutouts are formed. By connecting the terminals of the armature coil to the printed wiring pattern on the lower surface of the printed board with the cutouts in between, the electrical wiring between the terminals and the driving circuit can be easily performed. It is also possible to increase the size and to solve the problem without cutting the terminal of the armature coil.

Claims (7)

N (n is 1 or more on the corresponding stator surface with the gap between the field magnet and the pores provided as a rotor with field magnets provided with magnetic poles of N and S poles corresponding to P poles (P pole is an integer of 1 or more). And a single-phase stator armature formed by arranging the armature coils in a single phase, and having a single magnetoelectric conversion element for detecting the magnetic field of the field magnet and determining the energization direction of the armature coil based on the detection signal. In a single-phase brushless motor, a part of the stator yoke is cut and raised at a position within an angle range of one-two poles of the field magnet from a dead point position to form a cut piece, and the cut piece Magnetism for dead-point escape torque generation (reluct) because the field magnet is not constrained at the dead-point position by engraving. ance) Single phase brushless motor characterized by obtaining a torque. The single-phase brushless motor according to claim 1, wherein the cut pieces are formed at positions of one-fourth of the field magnets away from the dead-point position. The single-phase brushless motor according to claim 1, wherein m (m is an integer of 1 or more) pieces are formed at the stator yoke position in the in-phase position. The single-phase brushless motor according to claim 1, wherein the cut pieces are formed at symmetrical positions of 180 degrees. The single-phase brushless motor according to claim 1, wherein the cut pieces are formed by extending in a radial direction about a rotation axis. The single-phase brushless motor according to claim 1, wherein the cut pieces are formed in a radial direction not centered on a rotation axis. 2. The drive circuit according to claim 1, wherein the terminal of the armature coil is connected to a surface side on which the armature coil of the stator yoke is not disposed through a cutout portion formed by forming the cut pieces. A single phase brushless motor comprising electrical connection with an electronic component side constituting a furnace.