WO2007100026A1

WO2007100026A1 - Dc motor and dc vibration motor

Info

Publication number: WO2007100026A1
Application number: PCT/JP2007/053868
Authority: WO
Inventors: Tomoyuki Kugou
Original assignee: Namiki Seimitsu Houseki Kabushikikaisha
Priority date: 2006-03-03
Filing date: 2007-03-01
Publication date: 2007-09-07
Also published as: JP2007244006A; JP5204377B2

Abstract

[PROBLEMS] To provide a DC motor not requiring a complex control circuit, having a simple structure to enable the motor to be produced at low cost, having a long service life, and reduced in size and thickness. [MEANS FOR SOLVING THE PROBLEMS] A permanent magnet (M) is fitted to either a stator (2) or a rotor (3), and magnetic poles (G) constructed from electromagnets are fitted to the other. Magnetic poles (G) adjacent to each other along the circumference around the rotation axis of the rotor are excited to different polarities from each other. Each of the magnetic poles (G) has a yoke (Y) having an arc shape formed along the circumference around the rotation axis of the rotor. The cross sectional area of each yoke (Y) is gradually increased in the rotating direction of the rotor or in the direction opposite the rotating direction of the rotor so that the magnetic field has a gradient.

Description

Specification

DC motor and DC vibration motor

Technical field

The present invention relates to a DC motor suitable as a drive source for various small devices and a vibration mode using the same.

It is driven by a completely new principle that can be applied as a brushless motor.

It is related with the motor which performs.

Background art

Conventionally, as a vibration generator for silent calls built in a mobile phone, a vibration microphone

A mouth motor (vibration motor) is used. In addition to such vibration motors, micro motors are also used for medical devices (for example, the lens drive mechanism at the end of an endoscope or the device for diagnosis and treatment in the uterus).

Application as a drive source for various state-of-the-art devices such as drive mechanisms).

The field of use is expected to expand further.

[0003] Conventionally, brush motors have been mainly used as vibration motors and general-purpose micromotors.

I came. However, brushed motors have a simple drive power supply and can be manufactured at low cost.

On the other hand, the sliding contact point of the brush (mechanical wear, electric corrosion wear) is severe and the service life is short.

There is a shortcoming. In addition, flat type vibration motors that are aimed at making motors thinner are known.

However, for example, the flat vibration motor disclosed in Patent Document 1 has a peripheral force ^s of the sliding contact of the brush. Due to its large size, the sliding contact is particularly worn.

[0004] On the other hand, motors without sliding contacts such as brushless motors and stepping motors have a long service life.

Although it is a life, there is a problem especially in terms of manufacturing cost. In other words, the conventional brushless motor requires a complicated driver circuit to control the magnetic pole and rotation mode.

When considered, the manufacturing cost is very high compared with a motor with a brush. In addition, the magnets and the stator structure are complicated for the subbing motor, which is also very expensive to manufacture.

There is a problem that it is difficult to reduce the size.

[0005] To solve this problem, start with pulse drive without using a complicated driver circuit.

A brushless motor has also been proposed (for example, Patent Document 2).

Patent Document 1: JP-A-6-205565

Patent Document 2: Japanese Patent Laid-Open No. 10-174414

Disclosure of the invention

Problems to be solved by the invention

[0006] However, a brushless motor as disclosed in Patent Document 2 is a rotor having a special and complicated structure.

Because it is necessary to use a stator, the manufacturing cost is high and it is difficult to reduce the size.

There is a point.

Therefore, the object of the present invention is to solve the above-mentioned problems of the prior art, and to control complicated control circuits, etc.

Can be manufactured at low cost with a simple structure and a long life. It is an object to provide a DC motor and a DC vibration motor that can be reduced in size and thickness. Means for solving the problem

The inventors of the present invention have developed a brushless motor structure that can smoothly drive a rotor with a simple control circuit without using a complicated structure as in Patent Document 2.

As a result, the stator was placed at intervals to surround the magnet rotor.

For a plurality of magnetic poles, the cross-sectional area of the yoke constituting them is

By gradually increasing in the direction, the magnetic rotor is unidirectionally applied to the magnet rotor by providing a gradient in the magnetic field strength.

I got the idea of giving a tonolek to. Then, based on these ideas, we proceeded with the study.

As a result, it surrounds the magnet rotor and has an arc shape along the circumferential direction around the rotor rotation axis 3

Two magnetic poles (G) with a magnetic field (Y) are provided, and each magnetic field has a gradient of the magnetic field.

The cross-sectional area of the magnet (Y) is increased gradually toward the rotor rotation direction, and two magnetic poles (

By exciting G) to different polarities and reversing the polarities in a timely manner,

It has been found that the rotor rotates very smoothly in one direction. The motor with this driving principle is

As described above, the rotor includes a permanent magnet, and the stator includes a plurality of poles composed of electromagnets.

A motor (brushless motor) of a type that includes a plurality of magnetic poles, each of which has a permanent magnet and a rotor that is composed of electromagnets. ) It is possible to realize S

[0008] The present invention has been made on the basis of the above-described knowledge, and has a complicated control circuit or a conventional one.

Or two magnet poles composed of electromagnets without the use of a rotor with a complicated structure

Smoothly driven by a very simple control means that repeatedly reverses the polarity of

Type of DC motor.

That is, the DC motor and DC vibration motor of the present invention have the following characteristics.

[1] One of the rotor and the stator is provided with a permanent magnet (M) and the other is configured with an electromagnet.

2 n for applying torque to the rotor by interaction with the permanent magnet (M)

(Where n is an integer greater than or equal to 1) magnetic poles (G) spaced apart in the circumferential direction around the rotor rotation axis

Prepared,

Magnetic poles (G) adjacent in the circumferential direction around the rotor rotation axis (however, if the number of magnetic poles (G) is two

The two magnetic poles (G) are excited with different polarities, and each magnetic pole (G) has a yoke (Y) having an arc shape along the circumferential direction around the rotor rotation axis. Prepare

A DC motor characterized in that the cross-sectional area of each yoke (Y) is gradually increased in the direction of rotor rotation or counter-rotator rotation in accordance with the following conditions (i) and (mouth).

(Ii) The rotor has a permanent magnet (M) and the stator has a magnetic pole (G) composed of an electromagnet.

X.

When rotating the rotor

(Port) The stator has a permanent magnet (M), and the rotor has a magnetic pole (G) composed of an electromagnet. e

If it is

[2] The DC motor as set forth in [1], wherein the rotor includes a permanent magnet (M) and the stator includes a plurality of magnetic poles (G) constituted by electromagnets.

[3] The DC motor as set forth in [1], wherein the stator includes a permanent magnet (M) and the rotor includes a plurality of magnetic poles (G) formed of electromagnets.

[4] In the DC motor according to any one of [1] to [3], the plurality of magnetic poles (G) are each composed of a yoke (Y), and the rotor rotates outside or inside the plurality of yokes (Y). Along the circumferential direction around the axis

A direct current motor having a ring-shaped excitation coil.

[0011] [5] In the DC motor according to any one of [1] to [3], the plurality of magnetic poles (G) are each constituted by an armature coil provided with a yoke (Y). DC motor.

[6] Provided with two or four magnetic poles (G) along the circumferential direction around the rotor rotation axis, with respect to any one of the above [1] to [5] DC motors. DC motor features.

[7] A DC vibration motor characterized in that the rotor is provided with an eccentric weight or has an eccentric structure in addition to the DC motor of [1] to [6] above.

[8] In the DC vibration motor of [7], the rotor is configured to overlap with a disk-shaped data body having a permanent magnet (M) and a part of the surface of the disk with respect to the rotor body. Eccentric connected to

And a direct current vibration motor.

[9] In the DC vibration motor of [7] above, the rotor is configured in a disk shape, and one of the disks is

Features a permanent magnet (M) in the semicircular region and an eccentric weight in the other semicircular region

DC vibration motor.

[10] In the DC vibration motor of [7] above, the main part of the rotor is a permanent magnet having an eccentric structure. A direct current vibration motor comprising a stone (M).

The invention's effect

[0013] The direct current motor and the direct current vibration motor of the present invention are configured so that the polarities of the two magnetic poles (G) are repeated in a timely manner.

Since it is driven simply by rotating it, no complicated control circuit is required, and the motor structure itself

The body also has a gradient in the magnetic field strength by gradually increasing the cross-sectional area of the yoke in the circumferential direction around the roll axis (for example, increasing at least one of the height, width, and thickness of the yoke). Therefore, it can be manufactured at a very low cost.

[0014] Further, the rotor includes a permanent magnet, and the stator includes a plurality of magnetic poles configured by electromagnets.

In addition to being brushless, such a motor has a simple structure as described above, so it has a long service life and a small size.

It is easy to mold and has a thickness that was difficult with conventional brushless motors and brushless vibration motors.

A size of 3mm or less can be easily realized.

BEST MODE FOR CARRYING OUT THE INVENTION

[0015] A DC motor of the present invention includes a permanent magnet (M) on one of a rotor and a stator, and the other side.

The magnetic pole is composed of an electromagnet, and the rotor is moved by the interaction with the permanent magnet (M).

2n (where n is an integer greater than or equal to 1) magnetic poles (G) providing torque are provided at intervals in the circumferential direction around the rotor rotation axis, and adjacent magnetic poles around the rotor rotation axis ( G)

If the number of magnetic poles (G) is two, the two magnetic poles (G) are excited with different polarities. Each magnetic pole (G) has an arc shape along the circumferential direction around the rotor rotation axis.

The yoke (Y) has a structure in which the cross-sectional area of each yoke (Y) is sequentially increased toward the rotor rotation direction or the counter-rotor rotation direction in accordance with the following conditions (i) and (mouth).

X.

When rotating the rotor

(Port) The stator has a permanent magnet (M), and the rotor has a magnetic pole (G) composed of an electromagnet.

X.

If it is

[0016] Such a direct current motor of the present invention includes (i) a type in which the rotor includes a permanent magnet (M) and the stator includes a plurality of magnetic poles (G) made of electromagnetic stone, and (ii) the stator is permanent. Any type of motor with a magnet (M) and a rotor with multiple magnetic poles (G) composed of electromagnets

However, the type (i) is a brushless motor, and the type (ii) is a brushed motor. In addition, both types (i) and (ii) above can be used as motors of either inner rotor type or after rotor type. Each of the plurality of magnetic poles (G) may be composed of an armature coil, but the claw pole type

Like the motor, each of the plurality of magnetic poles (G) is composed of a yoke (Y), and the outside of the plurality of yokes (Y)

Has a structure in which a ring-shaped excitation coil is arranged along the circumferential direction around the rotor rotation axis.

May be.

FIG. 1 to FIG. 5 show an embodiment of the inner rotor type brushless motor of the type (i) among the DC motors of the present invention, and FIG. 1 shows the case in a cross-sectional state. Plan view, Fig. 2 is a cross-sectional view taken along line II-II in Fig. 1, showing the rotor side permanent magnet (M) omitted, Fig. 3 is an exploded perspective view, and Fig. 4 is a part of case 1. , Excitation coil 5 and permanent magnet (M

) Is shown in a perspective view, and FIG. 5 shows the case 1 with part of the case 1 and the permanent magnet (M) omitted.

FIG. The present embodiment shows an example of a DC vibration motor that does not have an output shaft.

The

In the figure, 1 is a case composed of case members la and lb, 2 is a ring-shaped stator housed in the case 1, and 3 is a rotor rotatably arranged in the stator 2.

The

[0018] The stator 2 includes a pair of yoke units 4a, 4b and an excitation coil 5.

The Each yoke unit 4a, 4b has a ring-shaped main body 40a, 40b and a main body 40a

, 40b consists of arc-shaped yokes (Ya) and (Yb) formed along almost half of the circumference. These yokes (Ya) and (Yb) constitute the magnetic poles of the stator 2 and are configured such that their heights (= cross-sectional areas) increase sequentially in the rotor rotation direction. Therefore, the upper edges of the yokes (Ya) and (Yb) are inclined in a slope shape in the circumferential direction around the rotor rotation axis.

Yes.

[0019] Both yoke units 4a, 4b are assembled such that their arcuate yokes (Ya), (Yb) are held together in the circumferential direction in a state of being opposed to each other, thereby forming a yoke unit assembly 6. Then, on the outside of the yokes (Ya) and (Yb) constituting this yoke unit assembly 6, there is a rotation around the rotor rotation axis.

A ring-shaped exciting coil 5 along the circumferential direction is externally fitted.

In such a stator 2, the yokes (Ya) and (Yb) form magnetic poles (Ga) and (Gb) in a circumferential direction around the rotor rotation axis of 180 °, but they have different polarities. Excited, rotor 3 force S Torque is applied to the rotor 3 by interaction with the permanent magnet (M) provided.

[0020] The magnetic field strength at each of the magnetic poles (Ga) and (Gb) depends on the rotor rotation direction (direction indicated by the arrow in FIG. 1) due to the gradual increase in the height (cross-sectional area) of the yoke (Ya) and (Yb). ), That is, “Minimum

The area gradually increases from “area” to “maximum cross-sectional area”.

The cross-sectional area of the yoke (Ya), (Yb) is gradually increased in the circumferential direction around the rotor rotation axis.

For example, the thickness of the yoke may be changed, and the form is arbitrary. In addition, the cross-sectional areas of (Y a) and (Yb) increase stepwise (for example, staircase)

It may be a structure that increases gradually.

[0021] The rotor 3 is a so-called magnet rotor, and in this embodiment, an eccentric way h

In order to provide the functions of (for vibration motors), a planar C-shaped (or almost semi-ring shaped) permanent magnet (M

). The permanent magnet (M), which also serves as an eccentric weight, has a rotor rotation as shown in Fig. 1.

Among them, the angular separation of the legs is 200 to 250 °, more preferably about 210 to 240 °, particularly preferably about 220 to 230 ° from the viewpoint of motor driving performance and vibration performance. Desirably, the shape of the permanent magnet (Μ) is arbitrary, for example, it should not have an eccentric weight function.

In the case of a disc-shaped and substantially entirely composed of permanent magnets (two substantially semicircular permanent magnets).

It is also possible to make a disk by connecting stones).

[0022] The rotor 3 is fixed to a fixed shaft 7 fixed to the center of the case 1 via a bearing 8 (metal bearing) so as to be rotatable and fixed to the outside of the holding ring 9. Said flat It consists of a permanent magnet (M) with a C-shaped surface (or almost semi-ring shape). In the rotor 3, the permanent magnet (M) includes two magnetic poles 10A (S pole) and 10B (N pole).

In the DC motor of the present invention, at least one magnetic pole is constituted by the permanent magnet (M).

Torque is applied to the rotor 3 due to the interaction with the magnetic poles (Ga) and (Gb) composed of electromagnets.

Therefore, only one of the magnetic poles 10A (S pole) and 10B (N pole) may be provided.

[0023] In other drawings, reference numeral 11 denotes a roller for retaining oil in the bearing 8 and reducing contact resistance.

It is the best.

In this embodiment, the rotor 3 is rotated with respect to the fixed shaft 7 fixed to the case 1.

For example, a structure in which the shaft is rotatably supported by the case 1 and the rotor 3 is fixed to the shaft may be used.

In the DC motor of the present invention, the force S can be set to 2n or more (where n is an integer of 1 or more) of magnetic poles (G). Figure 6 shows a DC motor with four magnetic poles (Ga), (Gb), (Ga), (Gb).

1 1 2 2

FIG. 6 is a plan view showing an embodiment (inner rotor type motor of the above type (i) same as the embodiment of FIGS. 1 to 5) in a cross-sectional state. In this embodiment,

When using a DC motor as a vibration motor, attach or set an eccentric weight to the rotor 3.

Find out.

[0025] In the DC motor of the present invention, the magnetic poles (G) adjacent in the circumferential direction around the rotor rotation axis are different.

Therefore, in this embodiment, the stator is Each yoke unit 4a, 4b (not shown, see FIGS. 3 to 5) is almost 1/4 of the main body 40a, 40b (also not shown, see FIGS. 3 to 5). Two arc-shaped yokes (Ya), (Ya) and yokes (Yb), (Yb) formed along the circumference

1 2 1 2 It is provided in the position which each main body 40a, 40b opposes 180 degrees. These yokes (Y a), (Ya) and yokes (Yb), (Yb) also have their height (= cross-sectional area) oriented in the rotor rotation direction.

1 2 1 2

The yoke (Ya), (Ya) and the upper edge of the yoke (Yb), (Yb)

1 2 1 2

Is inclined like a slope in the circumferential direction around the rotor rotation axis.

[0026] Then, the yoke units 4a and 4b are assembled so that the arc-shaped yokes (Ya) and Ya) and the yokes (Yb (Yb)) are alternately held in the circumferential direction in an opposed state, York

2 1 2

A knit assembly 6 is constructed. Ring-shaped excitation along the circumferential direction around the rotor rotation axis is provided outside the yokes (Ya), (Ya) and the yokes (Yb), (Yb) that constitute the yoke unit assembly 6.

2 1 2

The magnetic coil 5 is externally fitted.

[0027] In such a stator 2, the yokes (Ya), (Ya) are positioned in a 180 ° relationship in the circumferential direction.

1 2

Magnetic poles (Ga), (Ga) excited to the same polarity, and the yokes (Yb), (Yb) are circumferentially

1 2 1 2

The magnetic poles (Gb) and (Gb) are located at 180 ° and are excited to the same polarity.

1 2

Extreme

(Ga), (Ga) and magnetic poles (Gb), (Gb) are excited to different polarities.

1 2 1 2

The magnetic field strength at each magnetic pole (Ga), (Ga) and magnetic pole (Gb), (Gb) is the yoke (Ya), (Ya)

1 2 1 2 1 2 and the yoke (Yb), the height (cross-sectional area) of the yoke (Yb) is gradually increased.

1 2

Direction), that is, from the “minimum cross-sectional area” to the “maximum cross-sectional area” shown in FIG.

It becomes gradually larger.

[0028] The rotor 3 of the embodiment of Fig. 6 is also a so-called magnet rotor, and is composed of four substantially quarter-circular permanent magnets.

A disk-shaped rotor body is formed by connecting stones (M), and these permanent magnets (M) make magnetic poles (G)

4 poles 10A (S pole), 10B (N pole), 10A (S pole), 10B

1 1 2

(N pole) is configured. In this embodiment also, the magnetic poles 10A to 10B Any one of these forces or two or three may be provided.

As described above, in the DC motor of the present invention, the number of magnetic poles (G) can be 2n (where n is an integer equal to or greater than 1). However, the motor structure can be simplified and manufactured easily. Sex 'Manufacturing Cost

In terms of smooth drive performance of the motor and motor, a particularly reasonable structure is 2 or 4

A structure with a magnetic pole (G) is preferred.

[0029] In the DC motor of the present invention, the permanent magnet (M) and the form of the magnetic pole 10 constituted thereby are special.

There is no limit.

Figures 7 (A) to (G) show examples of the permanent magnet (M) applied to the rotor of a DC motor of the type having two magnetic poles (G) and the magnetic pole 10 composed of the permanent magnet (M) ( Diagonal in each figure

Any of these forms may be used. Figs. 7 (A) and (B) show the permanent magnet (M) combined with the function of the eccentric weight.

For motors only.

[0030] The number of magnetic poles 10 relative to the number of magnetic poles (G) is also arbitrary. Basically, if there is at least one magnetic pole 10 (N pole or S pole), the polarity of magnetic pole (G) From the standpoint of ease of switching, the number of magnetic poles (G) and magnetic poles 10 is preferably the same. That is, in the case of having two magnetic poles (G), as shown in FIG. 1, two magnetic poles 10 of N pole and S pole are provided, and in the case of having four magnetic poles (G), FIG. As shown in Fig. 4, four magnetic poles are arranged by alternately arranging N poles and S poles in the circumferential direction.

10 is preferably provided.

[0031] FIG. 8 schematically shows (in principle) one embodiment of the outer rotor type brushless motor of the type (i) described above among the DC motors of the present invention. Magnet (M) Be equipped

The rotor (motor cover) 2x is a stator arranged inside the rotor 3x. Since the basic structure of this stator 2x is the same as that of the stator 2 in the embodiment of FIG. 1 and FIG. 5 including the configuration of the yokes (Ya), (Yb) and the magnetic poles (Ga), (Gb), the same reference numerals are used. The detailed explanation is attached.

Omitted. However, in the stator 2 according to the present embodiment, the ribs along the circumferential direction around the rotor rotation axis.

The yokes (Ya) and (Yb) are arranged outside the ring-shaped excitation coil 5. Also, these yokes

(Ya), (Yb) is also a pair of yoke units 4a having the same structure as the embodiment of FIGS.

It is constituted by a part of 4b (not shown).

The yokes (Ya) and (Yb) may be disposed inside the ring-shaped exciting coil 5. A permanent magnet (M) having a predetermined length in the circumferential direction is fixed inside the rotor 3x,

One

Magnetic pole 10 (N pole in this embodiment).

Next, the DC motor of the type (ii) described above, i.e., the stator has a permanent magnet.

, DC motor of the type with a plurality of magnetic poles whose rotor is composed of electromagnets

To do.

FIG. 9 schematically shows an embodiment of the inner rotor type brush motor of the type (ii).

2y is a stator with a permanent magnet (M), and 3y is placed inside this stator 2y.

It is a rotor to be placed. The basic structure of the rotor 3y is the same as that of the stator 2 in the embodiment of FIGS. 1 to 5 including the configuration of the yokes (Ya), (Yb) and the magnetic poles (Ga), (Gb).

A detailed description is omitted. However, in this embodiment, the stator 2y is a permanent magnet (M) The

Since the rotor 3y is provided with the magnetic pole (G), the cross-sectional areas of the yokes (Ya) and (Yb) are sequentially increased in the anti-rotor rotation direction, contrary to the embodiment of FIGS. Enlarge.

[0033] Further, in the rotor 3y of the present embodiment, a ring-like shape along the circumferential direction around the rotor rotation axis.

The yokes (Ya) and (Yb) are arranged inside the exciting coil 5. The yokes (Ya) and (Yb) are also constituted by a part of a pair of yoke units 4a and 4b (not shown) having the same structure as that of the embodiment of FIGS.

The yokes (Ya), (Yb) may be arranged outside the ring-shaped exciting coil 5 as in the embodiment of FIG.

A permanent magnet (M) having a predetermined length in the circumferential direction is fixed inside the stator 2y.

There are two magnets 10 (N pole in this embodiment).

FIG. 10 schematically shows an embodiment of the outer rotor type brush motor of the type (ii).

3z is a rotor, 2z is a permanent magnet (M) placed inside this rotor 3z.

A stator provided. The structure of the rotor 3z itself is the yoke (Ya), (Yb) or magnetic pole (Ga), (Gb)

The same reference numerals are used for the stator 2 in the embodiment of FIGS.

The detailed description is omitted. However, also in this embodiment, the stator 2z is provided with a permanent magnet (M).

On the other hand, since the rotor 3z is provided with the magnetic pole (G), the cross-sectional areas of the yokes (Ya) and (Yb) are sequentially increased in the counter-rotor rotation direction, contrary to the embodiment of FIGS. Enlarge.

The stator 2z has a disk-shaped stator body by connecting two substantially semicircular permanent magnets (M).

This permanent magnet (M) forms two magnetic poles 10A (S pole) and 10B (N pole). It is.

[0035] (i) type outer rotor type brushless motor (Fig. 8) and (ii) type inner rotor type brushed motor (Fig. 9) and outer rotor type brushed motor ( The following conditions for the inner rotor type brushless motor shown in FIGS. 1 to 5 also apply to FIG. 10).

(Ii) The number of magnetic poles (G) can be any number greater than 2n (where n is an integer greater than or equal to 1). However, as a particularly rational structure, a structure with two or four magnetic poles (G) is preferred.

[0036] (Mouth) The permanent magnet (M) and the magnetic pole 10 constituted by the permanent magnet (M) may have any configuration as long as torque can be applied to the rotor 3 by interaction with the magnetic pole (G) constituted by the electromagnet. . Magnetic pole (G

The number of magnetic poles 10 with respect to the number of magnetic poles 10) is arbitrary, and basically at least one magnetic pole 10 (N pole or S pole) is sufficient, but from the standpoint of ease of switching the polarity of the magnetic pole (G). With the magnetic pole (G)

The number of magnetic poles 10 is preferably the same. That is, if you have two magnetic poles (G),

If there are 4 magnetic poles (G), it is preferable to provide 4 magnetic poles 10 by alternately arranging N poles and S poles in the circumferential direction. .

[0037] In each of the embodiments described above, a plurality of magnetic poles (G) are respectively provided in the same manner as the claw pole type motor.

3—

(Y) and the outer or inner side of the plurality of yokes (Y) along the circumferential direction around the rotor rotation axis.

The force S, which is an arrangement of the ring-shaped exciting coils 5, and the magnetic poles (G)

It may be composed of armature coils with Y).

FIG. 11 is a perspective view showing an embodiment thereof. This DC motor (inner rotor type motor of the above type (i), which is the same as the embodiment of FIGS. 1 to 5 and FIG. 6), is the same as the embodiment of FIG. Similarly, four magnetic poles (Ga), (Gb), (Ga), (Gb) are provided.

1 1 2 2

[0038] The stator 2 of the present embodiment has an arc-shaped armature coil corresponding to approximately 1/4 turn of the case 1.

12a, 12b, 12a, 12b are arranged in order along the inner circumference of the force case 1,

1 1 2 2

Armature coinoles 12a, 12b, 12a, 12b, the magnetic poles (Ga (Gb),

1 1 2 2 1 1

(Ga 1), (Gb 2) are configured and laid out. Each armature coin 12a, 12b, 12a, 12

2 2 1 1 2

b represents an exciting coil 13a on the outside of the arc-shaped yoke (Ya), (Yb (Ya), (Yb).

2 1 1 2 2 1

, 13b, 13a, and 13b.

1 2 2

From the armature coiner 12a, 12b, 12a, 12b

1 1 2 2

The yokes (Ya) and (Ya) and the yokes (Yb) and (Yb) are 180 in case 1. Opposite position

1 2 1 2

Is arranged. These yokes (Ya), (Yb), (Ya), (Yb) have their height (= cross-sectional area)

1 1 2 2

) Are sequentially increased in the rotor rotation direction.

[0039] In such a stator 2, the yokes (Ya), (Ya) are positioned in a 180 ° relationship in the circumferential direction.

1 2

1 2 1 2

1 2

Pole

(Ga), (Ga) and magnetic poles (Gb), (Gb) are excited with different polarities, and the permanent magnets of rotor 3

1 2 1 2

Torque is applied to rotor 3 by interaction with stone (M).

1 2 1 2 1 2 and the yoke (Yb), the height (cross-sectional area) of the yoke (Yb) gradually increases, and the rotor rotation direction (arrow in Fig. 11)

1 2

It becomes larger gradually.

[0040] The rotor 3 of the embodiment of Fig. 11 is also a so-called magnet rotor, and has four permanent semicircular permanent shapes.

A magnet (M) is connected to form a disk-shaped rotor body, and these permanent magnets (M)

) 4 magnetic poles 10A (S pole), 10B (N pole), 10A (S pole), 10 B (N pole) is configured. In this embodiment also, the magnetic poles 10A to 10B

Any one of 2 1 or just two or three may be provided.

2

Therefore, the driving principle of this type of DC motor is also exactly the same as that of the embodiment of FIG. 6. Also, this type of motor is provided with two armature coils, so that FIGS. It is possible to have two magnetic poles (Ga) and (Gb) as in the embodiment. In addition, (i) the rotor is provided with a permanent magnet (M), and the stator is provided with a plurality of magnetic poles (G) composed of electromagnets.

(Ii) A plurality of magnetic poles (G) in which the stator includes a permanent magnet (M) and the rotor is composed of an electromagnet.

It can be applied to any of the types including In addition, both types (i) and (ii) above can be used as an inner rotor type or outer rotor type motor.

In the embodiment shown in FIG. 11, the plurality of magnetic poles (G) are arranged so as to surround the rotor itself.

The multiple magnetic poles (G) should be arranged so as to form a magnetic pole that gives torque to the rotor 3, and the multiple magnetic poles should be arranged at intervals in the circumferential direction around the rotor rotation axis. Yes. Shi

Therefore, a plurality of magnetic poles (G) may be arranged so as to surround the rotation axis of the rotor 3. They will be placed facing each other (opposing).

[0043] As a control circuit (driver circuit) used in the brushless motor of the present invention, the rotor 3 is [

360 / number of magnetic poles (G)] angle corresponding to ° (for example, in the case of the embodiment of FIGS. 1 to 5

80 °, 90 ° in the case of the embodiment of FIG. 6)

It is only necessary to use a switch circuit having a function of reversing the direction. Such a control circuit is For example, a circuit provided in a target device such as a mobile phone may be used. Also

In addition to using such a control circuit, for example, each excitation coil 5 has a different polarity.

It is also possible to adopt a method in which two sets of coils are provided and the polarity of the magnetic pole (G) is switched by switching between the two sets of coils.

In the case of a motor with a brush, the rotor 3 is [number of 360Z magnetic poles (G)]. (E.g., 180 ° for the embodiment of FIGS. 1-5, and for the embodiment of FIG. 6).

(90 °) each time it is rotated, the brush and alignment are such that the direction of the current flowing in each magnetic pole (G) is reversed.

A drifter may be used.

Next, the drive principle of the DC motor of the present invention is illustrated by taking the embodiment shown in FIGS. 1 to 5 as an example.

12 Based on (A) to (E). In FIG. 12, the magnetic pole (Ga) and the magnetic pole (Gb) are schematically indicated by hatched portions, and the strength of the magnetic field of each portion is indicated by the thickness of the shaded portion. In Fig. 12 (A), the magnetic pole (Ga) consisting of the yoke (Ya) is excited to the N pole, and the magnetic pole (Gb) consisting of the yoke (Yb) is excited to the S pole, and the rotor 3 (permanent magnet) The S pole is excited to the N pole.

The magnetic pole (Ga) has the strongest magnetic field, and the N pole of the rotor 3 (permanent magnet) is the S pole.

Each of the magnetic poles (Gb) excited by is fixed at the strongest magnetic field.

From this state, as shown in Fig. 12 (B), the polarity of the magnetic pole (Ga) and magnetic pole (Gb) is switched (reversed), the magnetic pole (Ga) is changed to S pole, and the magnetic pole (Gb) is changed to N pole. When excited, a repulsive force is generated between the magnetic pole (Ga) (S pole) and the S pole of the rotor 3, and between the magnetic pole (Gb) (N pole) and the N pole of the rotor 3, and on the other hand, the magnetic pole (Gb) (N Pole) and the S pole of the rotor 3, and between the magnetic pole (Ga) (S pole) and the N pole of the rotor 3, attracting force is applied to the rotor 3 in the direction of the arrow in the figure, and the rotor 3 is Times

Roll.

[0045] Further, the strength of the magnetic field at each magnetic pole (Ga) and magnetic pole (Gb) increases in order in the rotor rotation direction.

As shown in Fig. 12 (C), the rotor 3 rotates as the S pole and the N pole of the rotor 3 are sequentially attracted to the side where the magnetic field is stronger, as shown in Fig. 12 (C). However, as shown in Fig. 12 (D), the magnetic field is the most among the magnetic poles (Gb) excited to S and N poles of rotor 3 as much as possible.

The magnetic field of the magnetic field (Ga) excited by the rotor 3's N pole S and S pole

Each is fixed at a strong position. At this point, as shown in Fig. 12 (E), the polarity of the magnetic pole (Ga) and magnetic pole (Gb) is switched (reversed) again, the magnetic pole (Ga) is set to N pole, and the magnetic pole (Gb) is set to S pole. When the magnets are excited, repulsive forces are generated between the magnetic pole (Gb) (S pole) and the S pole of the rotor 3, and between the magnetic pole (Ga) (N pole) and the N pole of the rotor 3, respectively, Ga) (N pole) and S pole of rotor 3, magnetic pole (G

b) and the N pole of the rotor 3 are attracted respectively, so that torque is continuously applied to the rotor 3.

Rotor 3 continues to rotate.

As described above, the DC motor of the present invention generates the magnetic field strength of each magnetic pole (G) and the gradient of the magnetic field.

In this way, the structure is gradually increased toward the rotor rotation direction (or anti-rotor rotation direction).

Thus, every time the rotor 3 rotates by a predetermined angle (180 ° in the case of Fig. 12), the polarity of the two magnetic poles (G) can be switched alternately (inverted) between the S pole and the N pole. Then, rotor 3 continues to rotate. Here, the polarity of the magnetic pole (G) is reversed by the rotor 3 [number of 360Z magnetic poles (G)]. This is done every time the angle is rotated.

In the description of FIG. 12, the repulsion between the N pole and the S pole of the rotor 3 between the excited magnetic poles. Although it has been stated that torque is applied by attractive force, for example, rotor 3 as shown in FIGS. 4 (B) to (D) (however, the permanent magnet shown in FIGS. 4 (B) to (D) is N Pole 'S pole position may be reversed).

The repulsive force between them-Torque is applied by suction force. Even in that case, the rotor 3

Rotate without title.

[0048] The DC motors shown in Figs. 8 to 10 are basically driven by the same driving principle as described above.

Rotate. That is, in the outer rotor type brushless motor shown in FIG.

The polarity of 2x magnetic poles (Ga) and (Gb) is alternated between S and N poles every time rotor 3x rotates 180 °.

By switching (reversing), the inner rotor brush motor shown in Fig. 9 changes the polarity of the magnetic poles (Ga) and (Gb) of the rotor 3y to the S pole every time the rotor 3y rotates 180 °. By alternately switching (reversing) between the N poles, and in the outer port type brush motor shown in Fig. 10, the polarity of the magnetic poles (Ga) and (Gb) of the rotor 3z is 180 ° By switching (reversing) between S pole and N pole alternately at each rotation,

The rotor rotates on the same drive principle as shown in FIG.

[0049] When the DC motor of the present invention is applied to a vibration motor, the main part of the rotor 3 has an eccentric structure.

Or have an eccentric weight.

Examples of the main part of the rotor 3 having an eccentric structure include the embodiments of FIGS. 1 to 5 and the embodiments of FIGS. 7 (A) and 7 (B).

Examples of the rotor 3 having an eccentric weight include, for example, a disk-shaped rotor 1 having an eccentric weight (not shown) as shown in FIGS. 7 (C) to (G). Rare The Specifically, (1) a disc-shaped rotor body with a permanent magnet (M) and the rotor body

A rotor composed of eccentric weights connected so as to overlap with a part of the surface of the lever, (2) disk shape

With a permanent magnet (M) in one semicircular region of the disk and eccentric in the other semicircular region

Examples include a rotor having a weight.

[0050] The embodiment shown in Figs. 1 to 5 is an application of the DC motor of the present invention to a vibration motor.

The direct current motor of the invention can also be applied to a general-purpose motor used as a rotational drive source.

However, in this case, a rotatable motor shaft (output shaft) is provided, and the rotor is fixed to the motor shaft. Normally, this motor shaft is placed along the axis of the case.

And is rotatably supported by the case via a bearing. Such a DC motor has a rotor and a motor.

The rotor shaft rotates as a unit, and the rotational output is taken from the motor shaft.

Brief Description of Drawings

FIG. 1 is a plan view showing a DC motor according to an embodiment of the present invention in a cross-sectional state.

FIG. 2 is a cross-sectional view taken along line II—II in FIG. 1, showing the rotor side permanent magnet (M) omitted.

FIG. 3 is an exploded perspective view of the DC motor of the embodiment of FIG.

[FIG. 4] Perspective view showing the DC motor of the embodiment of FIG. 1 with a part of case 1, the exciting coil 5 and the permanent magnet (M) omitted.

FIG. 5 is a perspective view showing the DC motor of the embodiment of FIG. 1 with a part of case 1 and the permanent magnet (M) omitted.

FIG. 6 is a plan view showing another embodiment of the direct current motor of the present invention in a state in which the case is cross-sectioned. FIG. 7 shows the rotor constituting the direct current motor of the present invention and the form of a permanent magnet provided on the rotor. Illustration showing an example

FIG. 9 is a plan view showing another embodiment of the DC motor of the present invention in a state in which the case is cross-sectioned. FIG. 9 is a plan view showing another embodiment of the DC motor in accordance with the present invention in a state in which the case is cross-sectioned. 10] A plan view showing another embodiment of the direct current motor of the present invention in a state in which the case is cross-sectioned. 11] A perspective view showing another embodiment of the direct current motor in accordance with the present invention in a state of cutting the case. Explanatory drawing which shows the drive principle of the DC motor of this invention

Explanation of symbols

1 case

la, lb Case material

2, 2x, 2y, 2z stator

3, 3x, 3y, 3z rotor

4a, 4b Yoke unit

5 Excitation coil

6 Yoke unit thread and solid

7 Fixed shaft

8 Bearing

9 Retaining ring

10A, 10B, 10A, 10A, 10B, 10B Magnetic pole

1 2 1 2

12a, 12b Armature coil

13a, 13b Excitation coil

40a, 40b body

(Ya) 's Ya (Ya), (Yb), (Yb (Yb) York

1 2 1 2

(Ga), (Ga (Ga), (Gb), (Gb), (Gb) Magnetic pole

1 2 1 2

(M) Permanent magnet

Claims

The scope of the claims

[1] One of the rotor and stator is equipped with a permanent magnet (M) and the other is composed of an electromagnet.

2n magnetic poles that apply torque to the rotor through interaction with the permanent magnet (M).

(Where n is an integer equal to or greater than 1) Magnetic poles (G) are spaced in the circumferential direction around the rotor rotation axis.

e,

X.

When rotating the rotor

X.

If it is

[2] The rotor has permanent magnets (M) and the stator has multiple magnetic poles (G) composed of electromagnets

The DC motor according to claim 1, wherein:

[3] The stator has a permanent magnet (M), and the rotor has a plurality of magnetic poles (G) composed of electromagnets

The DC motor according to claim 1, wherein:

[4] Each of the plurality of magnetic poles (G) includes a yoke (Y), and the outside or inside of the plurality of yokes (Y) Mouth

A ring-shaped excitation coil along a circumferential direction around the rotation axis

Item 4. A DC motor according to any one of Items 1 to 3.

[5] The plurality of magnetic poles (G) are composed of armature coils each having a yoke (Y).

The DC motor according to any one of claims 1 to 3.

[6] Featuring two or four magnetic poles (G) along the circumferential direction around the rotor rotation axis

The DC motor according to any one of claims 1 to 5.

[7] The DC motor according to any one of claims 1 to 6, wherein the rotor includes an eccentric weight.

Is a DC vibration motor characterized by having an eccentric structure.

[8] The rotor includes a disk-shaped rotor body provided with a permanent magnet (M), and the disk with respect to the rotor body.

8. An eccentric weight connected so as to overlap with a part of the surface.

The direct current vibration motor described in 1.

[9] The rotor is configured in a disk shape, and has a permanent magnet (M) in one semicircular region of the disk,

The DC vibration module according to claim 7, wherein an eccentric weight is provided in the semicircular region.

■ ~

[10] The main part of the rotor is composed of a permanent magnet (M) having an eccentric structure.

The described DC vibration motor.