JP3225072B2 - External rotation type long thin motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an external rotation type long and thin motor used as a paper feed roller in office automation equipment such as a facsimile and a printer.

[0002]

2. Description of the Related Art A conventional external rotation type long and thin motor has a rotor position detecting means therein, and energizes a coil wound on a laminated core in accordance with position detection by the position detecting means. There is known a control method using a control method.

As shown in FIG. 15, eight stators 2 to 9 are fixed in the axial direction of the shaft 1 at predetermined intervals, and the stators 2 to 3, 4 and 5, 6 and 7, 8 and 9 are fixed. The windings 10, 11, 12, and 13 are disposed between them, and a disk-shaped permanent magnet 14 magnetized in the axial direction of the shaft is fixed between the stators 5 and 6 to form a stator assembly. Then, the stator assembly is mounted on a cylindrical rotor 19 supporting frames 17, 18 via bearing shafts 15, 16.
There are known 1.8-3.6 mini-angle stepping motor systems incorporated therein.

[0004]

However, in such a conventional external-rotation type elongate motor, for example, the diameter is less than 10 mm due to contact of an air gap due to deflection of a stator and a rotor and generation of magnetic vibration. It was difficult to make an ultra-slim motor having a length of 100 mm or more due to insufficient rigidity and the like.

Therefore, the present invention can minimize the contact of the air gap and the occurrence of magnetic vibration due to the deflection of the stator and the rotor, and can thus solve the problem of insufficient rigidity. An ultra-slim motor can be easily manufactured, and the output torque can be increased in proportion to the length. Is what you do.

[0006]

SUMMARY OF THE INVENTION According to the present invention, at least two or more stator magnetic pole pairs each formed by applying a winding in the long axis direction to a long and thin plate-like yoke are coaxially arranged via a bearing between them. And a cylindrical rotor having a multi-pole magnet circumferentially magnetized on the inner periphery on the outer periphery of the stator and rotatably supported by the bearing portion. Is provided.

[0007]

In the present invention having such a configuration, the magnetic poles of the stator are formed by applying windings in the long axis direction to the elongated plate-like yoke, so that the ultra-long and thin magnetic poles can be easily manufactured. Further, since the rotor is a cylindrical rotor having a multipole magnet magnetized in the circumferential direction on the inner periphery, an ultra-slim rotor can be easily manufactured. In addition, since two or more magnetic pole pairs are coaxially arranged with a bearing between them to form a rod-shaped integral stator, the deflection of the rotor is very small, minimizing air gap contact and magnetic vibration. The problem of insufficient rigidity can be solved.

[0008]

An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 21 denotes a cylindrical rotor, and this rotor 21 is a ring-shaped permanent magnet which is magnetized on the inner periphery of a cylindrical yoke 22 in the circumferential direction so as to be uniform in the axial direction. 23 is fixed.

Numeral 24 denotes a stator portion constituting a stator. The stator portion 24 is a stator yoke 25a formed by bending a long and thin magnetic plate into a V-shape so that an inner angle becomes 135 degrees around a long axis. 25b, the winding 2
6a, 26b and two stator pole pairs 27
a, 27b, and each stator pole pair 27a, 2
7b, they are connected in the axial direction via a stator yoke connecting portion 28 made of an insulator. That is, the stator magnetic pole pairs 27a and 27b constitute the A phase and the B phase, respectively, and the yokes 25a and 25b are arranged so that the circumferential phases of the A phase and the B phase are shifted by 45 degrees.

Both ends of the stator portion 24 are connected to stator fixing portions 29 and 30 made of an insulator. The stator yoke connecting portion 28 and the stator fixing portions 29 and 30 are fixed to the inner peripheral surface of the cylindrical rotor 21. Bearings 31, 32,
33 rotatably supported.

C-rings 34, 35 are attached to the outer peripheral portions of the stator fixing portions 29, 30 to prevent the stator portion 24 from coming off the cylindrical rotor 21. Holes 36 and 37 are formed in the center portions of the stator fixing portions 29 and 30, and lead wires 38 and 39 from the windings 26 a and 26 b are drawn out through the holes 36 and 37. ing.

As shown in FIG. 2, the stator fixing portion 29 is provided with grooves 29a, 29b at an angle of 135 degrees on the inner side, and the stator magnetic pole pairs 27a are formed in the grooves 29a, 29b.
One end of the yoke 25a is fitted. As shown in FIG. 4, the stator fixing portion 30 is shifted inward by 22.5 degrees from the grooves 29a and 29b of the stator fixing portion 29, and
Grooves 30a and 30b having an angle of 35 degrees are provided.
The yoke 25 of the stator magnetic pole pair 27b is provided at 0a and 30b.
b is fitted at one end. As shown in FIG. 3, the stator yoke connecting portion 28 has grooves 29a, 29b of the stator fixing portion 29 on the side facing the stator fixing portion 29.
Grooves 28a, 28b are provided at positions corresponding to the grooves 28a, 28b. Also, grooves 28c, 28b,
28d, and the other end of the yoke 25a of the stator pole pair 27a is fitted into the grooves 28a and 28b.
c, 28d, the yoke 25b of the stator pole pair 27b
Is fitted at the other end.

In the case of manufacturing a motor having such a structure, first, as shown in FIG. 5, a yoke obtained by bending a long and thin magnetic plate into a U-shape so that an inner angle becomes 135 degrees around the long axis. Windings 26a, 26b in the longitudinal direction at 25a, 25b
To produce two stator pole pairs 27a and 27b. The two stator pole pairs 27a and 27b are connected to the grooves 28a to 28d of the stator yoke connecting portion 28 and the grooves 29a, 29b, 30a and 30 of the stator fixing portions 29 and 30.
b to form an elongated stator portion 24.

On the other hand, as shown in FIG. 6, the cylindrical rotor 21 has two ring-shaped permanent magnets 23 and a ring-shaped bearing 31 inserted into a magnetic material pipe 41, and the bearing 31 is connected to the stator section 2 as shown in FIG.
4 and fixed at a position corresponding to the stator yoke connecting portion 28, and each permanent magnet 23 is fixed at a position corresponding to the yokes 25a and 25b. Further, the bearings 32 and 33 are fixed to the inner peripheral surfaces of both ends of the magnetic material pipe 41.

Alternatively, as shown in FIG. 7, two semicircular yokes 42a and 42b are formed by bonding and fixing to the outer peripheral surfaces of the bearings 31 to 33. Of course, the two ring-shaped permanent magnets 23 are also bonded and fixed to the outer peripheral surfaces thereof.

Further, as shown in FIG. 8, a permanent magnet 44 is attached to one folded thin plate 43 and is adhesively bonded so as to be wound around the outer periphery of the bearings 31-33.

The elongated stator portion 24 is inserted into the cylindrical rotor 21 thus constructed, and the C-rings 34, 35 are attached to the outer periphery of the stator fixing portions 29, 30 to complete the motor.

The operation of the motor constructed as described above will be described. If the rotor 21 is stopped in the state shown in FIG. In the figure, the south pole of the A-phase stator magnetic pole pair 27a faces the north pole of the permanent magnet 23, and the north pole of the stator magnetic pole pair 27a faces the south pole of the permanent magnet 23. In the B phase, the stator magnetic pole pair 27b is in a position intermediate between the N pole and the S pole of the permanent magnet 23, that is, in a state where the phase is shifted by 90 degrees in electrical angle.

In this state, when the phase A is turned off and the phase B is turned on, the rotor 21 has a mechanical angle of 22.5 degrees (90 electrical degrees).
Degree), the S-pole of the B-phase stator magnetic pole pair 27b is opposed to the N-pole of the permanent magnet 23, and the N-pole of the stator magnetic pole pair 27b is the S-pole of the permanent magnet 23, as shown in FIG. Opposite the pole. In the A phase, the stator magnetic pole pair 27a is
Is located between the N pole and the S pole.

In this state, the A-phase is turned on to excite in the reverse direction, and the B-phase is turned off.
Of the N pole of the permanent magnet 23, the S pole of the permanent magnet 23, the attractive force of the S pole of the stator magnetic pole pair 27a, and the N pole of the permanent magnet 23, and the N pole of the permanent magnet 23, Due to the repulsion between the S pole and the S pole of the permanent magnet 23,
The rotor 21 further has a mechanical angle of 22.5 degrees (90 electrical degrees).
Degree), the N-pole of the A-phase stator magnetic pole pair 27a faces the S-pole of the permanent magnet 23, and the S-pole of the stator magnetic pole pair 27a is the N-pole of the permanent magnet 23, as shown in FIG. Opposite the pole. In the B phase, the stator magnetic pole pair 27b is a permanent magnet 23.
Is located between the S pole and the N pole.

In this state, when the phase A is further turned off and the phase B is turned on to excite in the reverse direction, the B-phase stator pole pair 2
7b, N pole of permanent magnet 23, S pole of stator 23, stator magnetic pole pair 27
b, the repulsive force between the N pole of the stator magnetic pole pair 27b, the N pole of the permanent magnet 23, the S pole of the stator magnetic pole pair 27b, and the S pole of the permanent magnet 23. , The rotor 21 further has a mechanical angle of 22.5 degrees (9 in electrical angle).
0 degree), the N-pole of the B-phase stator magnetic pole pair 27b faces the S-pole of the permanent magnet 23, as shown in FIG.
The S pole of the stator magnetic pole pair 27b faces the N pole of the permanent magnet 23. In the phase A, the stator pole pair 27a is a permanent magnet 2
3 is located between the S pole and the N pole. Opposes the suction force. In the B phase, the stator magnetic pole pair 27b is a permanent magnet 23.
In the middle position between the N pole and the S pole, that is, in a state where the phase is shifted by 90 degrees in electrical angle. In this manner, the rotor 21 rotates stepwise in the clockwise direction in the figure by a mechanical angle of 22.5 degrees along the outer periphery of the stator portion 24.

If the control of the above four steps is performed in reverse, the rotor 21 will have a mechanical angle of 2 along the outer periphery of the stator portion 24.
Step rotation is performed in the counterclockwise direction in the figure by 2.5 degrees.

As described above, the yokes 25a and 25b obtained by bending the long and thin magnetic plate into a U-shape so that the inner angle becomes 135 degrees around the long axis are provided with the windings 26a and 26b in the long axis direction. Since the two stator magnetic pole pairs 27a and 27b are connected in the axial direction by the stator yoke connecting portion 28 made of an insulator to form the stator portion 24, an ultra-long and thin magnetic pole can be easily manufactured. If the yoke is held in a molding die and the entire stator is integrally formed, a more robust stator portion 24 can be formed.

The rotor 21 is provided with two ring-shaped permanent magnets 23, which are magnetized eight-pole in the circumferential direction so as to be axially uniform on the inner periphery of the cylindrical yoke 22, and are fixed. Since the three bearings 31 to 33 are inserted and fixed, an ultra-slim rotor can be easily manufactured. Therefore, for example, an ultra-slim motor having a diameter of 10 mm or less and a length of 100 mm or more can be easily manufactured.

In addition, the bearing 31 allows the stator pole pair 27
Since the stator fixing portions 29 and 30 are rotatably supported by the stator yoke connecting portion 28 connecting the a and 27b and the bearings 32 and 33, insufficient rigidity can be eliminated, and the deflection of the rotor 21 becomes small and the air gap becomes small. Contact and magnetic vibration can be prevented as much as possible.

Two more stator pole pairs 27a, 27
b, and a permanent magnet 23 magnetized to eight poles is arranged around the b. Therefore, a relatively large output torque can be obtained, for example, as a paper feed roller in office automation equipment such as a facsimile or a printer. An epimotor suitable for use is obtained. And the rotor 21
The number of stator pole pairs and permanent magnets in proportion to the length of
If the number is increased to four, the output torque can be increased in proportion to the length. Next, another embodiment of the present invention will be described with reference to the drawings.

As shown in FIG. 10, three windings 52a, 52b and 52c are applied to the stator yoke 51 in the axial direction to form an A-phase stator pole pair 53, and the stator yoke 54 is provided with three windings in the axial direction. Windings 55a, 55b,
Are performed to form a B-phase stator magnetic pole pair 56.

The stator yokes 51 and 54 are shown in FIG.
As shown in the figure, a long thin sheet metal 57 is bent at a portion shown by a dashed line in the figure, a winding is applied to a slot which is a part in the figure, and a part b is made a magnetic pole.
On the other hand, as shown in FIG. 12, an A-phase stator magnetic pole pair 53 and a B-phase stator magnetic pole pair 56 are formed by being back-to-back and integrated by welding or molding.

On the inner periphery of the cylindrical yoke 22 facing each magnetic pole of each of the stator yokes 51 and 54, a ring-shaped permanent magnet 58 magnetized in the circumferential direction so as to be uniform in the axial direction with four poles. Has been fixed.

The stator yokes 51 and 54 are connected by a stator yoke connecting portion 59, and the stator yoke connecting portion 59 is rotatably supported by a bearing 60 fixed to the inner periphery of the cylindrical yoke 22.

In the motor having such a configuration, assuming that the A-phase stator yoke 51 and the B-phase stator yoke 54 are stopped at the positions shown in FIG. When a current is applied to the windings 55a, 55b,... In the directions indicated by the arrows in the figure, the B1 and B3 poles are excited to the N pole, and the B2 and B4 poles are excited to the S pole. As a result, a rotating force in the clockwise direction is generated in the permanent magnet 58, and the rotor 61 is brought into the state shown in FIG. 13C via the state shown in FIG. 13B. That is, it stops after rotating 45 degrees.

In this state, the A-phase windings 52a-52
When a current is passed through c and the A1 and A3 poles are excited to the S pole, the rotor 61 is further rotated by 45 degrees to the state shown in FIG. If B phase is further energized in the opposite direction, B1
The pole and the B3 pole are excited to the S pole, and the rotor 61
Rotate degrees. Thus, the rotor 61 can be surely rotated.

Even in such a configuration, an ultra-slim magnetic pole can be easily manufactured, and an ultra-slim rotor can be easily manufactured. Therefore, for example, an ultra-slim motor having a diameter of 10 mm or less and a length of 100 mm or more can be obtained. Can be easily manufactured. In other respects, the same effects as those of the above embodiment can be obtained.

In this embodiment, the position of the magnetic pole is set to four by the A-phase stator yoke 51 and the B-phase stator yoke 54.
Although shifted by 5 degrees, the present invention is not necessarily limited to this, and as shown in FIG.
The phase of the magnetic poles of the stator yoke 54 may be the same, and the phases of the permanent magnets 58 arranged on the outer periphery thereof may be shifted by 45 degrees between the A phase and the B phase. If you do this, A
The phase and B-phase stator pole pairs can be manufactured integrally.

[0036]

As described above in detail, according to the present invention, the contact of the air gap and the generation of magnetic vibration due to the deflection of the stator and the rotor can be prevented as much as possible, so that the problem of insufficient rigidity can be solved. 10mm or less and 100mm in length
The above-mentioned super-slim motor can be easily manufactured, and the output torque can be increased in proportion to the length. An external-rotating long-slim motor suitable for use as a paper feed roller or the like is provided. You can do it.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged sectional view and a side view of one stator fixing portion in the embodiment.

FIG. 3 is an enlarged sectional view and a side view of a stator yoke connecting portion in the embodiment.

FIG. 4 is an enlarged sectional view and a side view of the other stator fixing portion in the embodiment.

FIG. 5 is a diagram showing a configuration of a stator pole pair in the embodiment.

FIG. 6 is a view showing a configuration example of a cylindrical rotor in the embodiment.

FIG. 7 is a diagram showing another configuration example of the cylindrical rotor in the embodiment.

FIG. 8 is a view showing another configuration example of the cylindrical rotor in the embodiment.

FIG. 9 is a view for explaining the rotation operation of the embodiment.

FIG. 10 is a sectional view showing another embodiment of the present invention.

FIG. 11 is a diagram showing a configuration of a stator yoke in the embodiment.

FIG. 12 is a diagram showing a configuration of a stator magnetic pole pair in the embodiment.

FIG. 13 is a view for explaining the rotation operation of the embodiment.

FIG. 14 is a sectional view showing still another embodiment of the present invention.

FIG. 15 is a sectional view showing a conventional example.

[Explanation of symbols]

21: cylindrical rotor, 23: permanent magnet, 24: stator part, 25a, 25b: stator yoke, 26a, 26b
... windings, 27a, 27b ... stator pole pairs, 28 ... stator yoke connection parts, 29, 30 ... stator fixing parts, 3
1, 32, 33 ... bearings.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H02K 16/00 H02K 5/167 H02K 21/22

Claims (1)

(57) [Claims] At least two or more stator magnetic pole pairs each formed by applying a winding in a long axis direction to an elongated plate-like yoke,
A rod-shaped integral stator is formed by being coaxially arranged with a bearing portion interposed therebetween, and the outer periphery of the stator has a circumferentially magnetized multipolar magnet on the inner periphery and the bearing portion. An external-rotation type long and thin motor characterized by comprising a cylindrical rotor rotatably supported on the motor.