JPH10229669A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the output while limiting the outside diameter by arranging first and second coils on the opposite sides of a magnet ring in the axial direction and passing the magnetic flux generated from the first coil between third and first yokes and the magnetic flux generated from the second coil between the third and second yokes. SOLUTION: Coils 3, 4 are arranged concentrically to a magnet ring 1 on the opposite sides of the magnet ring 1 in the axial direction. A first yoke 5 has teeth 5b, 5c facing the inside diameter part of the first magnetized layer of a permanent magnet 1 and a second yoke 6 has teeth 6b, 6c facing the inside diameter part of the second magnetized layer of the magnet ring 1. The teeth 5b, 5c and 6b, 6c are located to be in-phase, i.e., located to face each other in the axial direction. The third yoke 7 is tubular and covers the outer circumference of the coils 3, 4 and the magnet ring 1. The third yoke 7 has such parts 7a, 7b as facing the teeth 5b, 5c of the first yoke 5 and the teeth 6b, 6c of the second yoke 6 while clamping the magnet ring 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical motor.

[0002]

2. Description of the Related Art As a small cylindrical step motor, there is one shown in FIG. A stator coil 105 is concentrically wound around the bobbin 101, and the bobbin 101 is sandwiched and fixed by two stator yokes 106 in the axial direction, and the stator yoke 106 has stator teeth 106 a in the circumferential direction of the inner diameter surface of the bobbin 101. The stators 106 b are alternately arranged, and the stator yoke 106 integrated with the stator teeth 106 a or 106 b is fixed to the case 103 to form the stator 102.

One of two cases 103 has a flange 1
15 and the bearing 108 are fixed, and another bearing 108 is fixed to the other case 103. Rotor 109
The rotor magnet 111 is fixed to the rotor shaft 110, forms a radial gap with the stator yoke 106a of the stator 102, and is both supported by the bearing 108.

[0004]

However, in the above conventional example, the case 103, the bobbin 101, the stator coil 105, the stator yoke 106 and the like are arranged concentrically on the outer periphery of the rotor, so that the outer dimensions of the motor become large. There was a disadvantage. The magnetic flux generated by energizing the stator coil 105 is mainly caused by the stator teeth 106a
Magnet 111 for passing between the end faces of
There is also a disadvantage that the output does not increase because it does not work effectively.

Accordingly, it is an object of the present invention to provide a motor having a high output while keeping the outer diameter of the motor small and easy to manufacture.

[0006]

In order to achieve the above object, a motor according to the present invention has a cylindrical shape which is divided into n parts in a circumferential direction and different poles are alternately magnetized. A magnet ring made of a helical permanent magnet whose shape is shifted by 180 ° / n from one end face to the other end face of a cylindrical shape, a rotor to which the magnet ring is fixed, and a magnet ring concentric with the rotor and A first coil and a second coil arranged at positions sandwiched in the axial direction, and a first yoke made of a soft magnetic material which is inserted into the inner diameter of the first coil and faces the inner diameter of the magnet ring with a clearance therebetween. A second yoke made of a soft magnetic material, which is inserted into the inner diameter of the second coil and faces the inner diameter of the magnet ring with a clearance, covering the first coil and the second coil; And having a third yoke made of a soft magnetic material covering the predetermined angular range of the outer diameter portion of the magnet ring.

In the above configuration, since the first coil and the second coil are arranged at positions that sandwich the magnet ring in the axial direction, the outer diameter of the motor is reduced.
In addition, the magnetic flux generated by the first coil passes between the third yoke facing the outer peripheral surface of the permanent magnet and the first yoke facing the inner peripheral surface of the permanent magnet, and thus effectively acts on the permanent magnet. Since the magnetic flux generated by the second coil passes between the third yoke facing the outer peripheral surface of the permanent magnet and the second yoke facing the inner peripheral surface of the permanent magnet, it effectively acts on the permanent magnet, Increase motor output. Further, since the magnetized shape of the permanent magnet is formed in a spiral shape, the shape of the third yoke can be simplified, and the motor can be manufactured easily.

In order to achieve the above object, the present invention relates to a motor having a cylindrical shape in which a magnetic pole is divided into n portions in the circumferential direction and different poles are alternately magnetized, and the magnetized shape is a cylindrical shape. A magnet ring made of a permanent magnet having a helical shape deviated from the end face to the other end face by 180 ° / n; a rotor to which the magnet ring is fixed; and a position concentric with the rotor and sandwiching the rotor in the axial direction. A first yoke made of a soft magnetic material inserted into the inner diameter of the first coil and facing the inner diameter of the magnet ring with a gap, and the second coil And a second yoke made of a soft magnetic material which is inserted into the inner diameter of the magnet ring and faces the inner diameter of the magnet ring with a clearance, one end of which is connected to the first yoke and covers the outer diameter of the first coil. other A third yoke made of a soft magnetic material having a magnetic pole portion facing an outer peripheral portion of the magnet ring, one end of which is connected to the second yoke and covers an outer diameter portion of the second coil, and the other end is the magnet ring. A fourth yoke made of a soft magnetic material having a magnetic pole portion facing the outer peripheral portion of the first yoke; and a connecting member made of a nonmagnetic material holding the third yoke and the fourth yoke concentrically. And

In the above configuration, since the first coil and the second coil are arranged at positions sandwiching the magnet ring in the axial direction, the outer diameter of the motor is reduced. Further, the magnetic flux generated by the first coil passes between the first yoke facing the inner peripheral surface of the magnet ring and thus effectively acts on the magnet ring, and the magnetic flux generated by the second coil is applied to the outer periphery of the magnet ring. Since it passes between the fourth yoke facing the surface and the second yoke facing the inner peripheral surface of the magnet ring, it effectively acts on the magnet ring and increases the output of the motor.

Further, since the third yoke and the fourth yoke are connected by a connecting member made of a non-magnetic material, the magnetic flux generated from the coil does not pass between the third yoke and the fourth yoke, so that the output is further increased. Get higher. Further, since the magnetized shape of the permanent magnet is made spiral, the third yoke and the fourth
The magnetic pole portions of the yoke can be arranged at positions opposing each other in the direction parallel to the axis, so that the shape of the connection member can be simplified, or the third yoke and the fourth yoke can be arranged.
The connecting member in the portion of the yoke where there is no magnetic pole portion is formed in a concave shape, so that the thickness of the motor in one direction can be reduced and the motor can be made more compact.

Further, the present invention, in addition to the above-described configuration,
The magnetic pole portion of the third yoke or the magnetic pole portion of the fourth yoke is formed in a helical shape in parallel with the magnetized helical shape of the magnet.

In the above configuration, the magnetic pole portion effectively acts on the magnetized portion of the permanent magnet to increase the output of the motor.

[0013]

【Example】

(Embodiment 1) FIGS. 1 to 5 are views showing Embodiment 1 of the present invention. Reference numeral 1 denotes a cylindrical magnet ring, which is made of a permanent magnet and divides the circumference into n parts. In the present embodiment, the S pole and the N pole are alternately magnetized by dividing into four parts. The magnetized shape is a spiral shape that is shifted from one end face to the other end face of the magnet ring by 180 ° / n (45 ° in this embodiment). 1a
The parts 1c and 1c are attached so that the outer peripheral surface is an S pole and the inner peripheral surface is an N pole. Magnetized.

Reference numeral 2 denotes a rotating shaft to which the magnet ring 1 is fixed. The rotating shaft 2 and the magnet ring 1 constitute a rotor. Reference numerals 3 and 4 denote coils which are arranged concentrically with the magnet ring 1 and at positions sandwiching the magnet ring 1 in the axial direction. 5 is a first material made of a soft magnetic material.
The 5d portion inserted into the inner diameter portion 3a of the coil 3 by the yoke and the teeth 5 facing the inner diameter portion of the first magnetized layer of the permanent magnet 1
b, 5c. The teeth 5b and 5c are formed at 360 / (n / 2) degrees, that is, 180 °, so as to be in phase with the poles of the first magnetized layer. It is rotatably fitted to the portion 2a.

Reference numeral 6 denotes a second yoke made of a soft magnetic material, and a 6d portion inserted into the inner diameter portion 4a of the coil 4 and teeth 6b, 6 facing the inner diameter portion of the second magnetized layer of the magnet ring 1.
Have c. The teeth 6b and 6c are 360 / (n / 2) degrees, that is, 180 degrees, so that they are in phase with the poles of the second magnetized layer.
It is formed shifted by °. The hole 6a of the second yoke 6 and the portion 2b of the rotating shaft 2 are rotatably fitted. The teeth 5b, 5c of the first yoke 5 and the teeth 6b, 6c of the second yoke 6 are in the same phase, that is, at positions facing each other in the axial direction.

Reference numeral 7 denotes a third yoke made of a soft magnetic material. The third yoke has a cylindrical shape, and the coil 3, the coil 4,
The magnet ring 1 is configured to cover the outer periphery. The third yoke 7 is connected to the 5e portion of the first yoke 5 at the 7e portion, and is connected to the second yoke 6e portion at the 7f portion. The third yoke 7 has teeth 5b, 5c of the first yoke 5,
There are positions 7a and 7b facing the teeth 6b and 6c of the yoke 6 with the magnet ring 1 interposed therebetween, and holes 7c and 7d are formed in other portions. Teeth 5 of first yoke 5
b, 5c and the teeth 6b, 6c of the second yoke 6 have the same phase, so that the magnetic pole portions 7 of the third yoke 7 to be opposed to those teeth
As shown in FIG. 1, a and 7b have a simple shape and can be easily manufactured by a press or the like.

FIG. 2 is a sectional view after assembling. FIGS. 3 (a), 3 (b), 3 (c) and 3 (d) show AA sections in FIG. 2 and FIGS. 3 (e) and 3 (f). ), (G) and (h) show BB cross sections in FIG. 3 (a) and 3 (e) are cross-sectional views at the same point, FIGS. 3 (b) and 3 (f) are cross-sectional views at the same point, and FIGS. g) is a cross-sectional view at the same time, and FIGS. 3D and 3H are cross-sectional views at the same time.

In the state shown in FIGS. 3A and 3E, the coils 3 and 4 are energized to change the teeth 5b and 5c of the first yoke 5 to the S pole and the third yoke 7a facing the teeth 5b and 5c. , 7b
Portion is the N pole, the teeth 6b and 6c of the second yoke 6 are the S pole, and the teeth 6
When the portions 7a and 7b of the third yoke opposed to b and 6c are excited to the N-pole, the magnet ring 1 rotates 45 ° left (counterclockwise) to reach the state shown in FIGS. 3 (b) and 3 (f). .

Next, the power supply to the coil 3 is reversed,
The teeth 5b, 5c of the yoke 5 are N poles, the third yokes 7a, 7b facing the teeth 5b, 5c are S poles, and the teeth 6 of the second yoke 6
When the b and 6c are excited to the S pole and the 7a and 7b portions of the third yoke facing the teeth 6b and 6c are excited to the N pole, the magnet ring 1
Is further rotated counterclockwise by 45 °, and is in the state shown in FIGS. 3 (c) and 3 (g).

Next, when the energization of the coil 4 is reversed to excite the teeth 6b and 6c of the second yoke 6 to the N pole and the portions 7a and 7b of the third yoke facing the teeth 6b and 6c to the S pole, the permanent magnet 1 further rotates 45 ° to the left. By sequentially switching the energizing direction to the coils 3 and 4 in this manner, the rotor including the magnet ring 1 and the rotating shaft 2 rotates to a position corresponding to the energizing phase.

FIG. 4 is a top plan view of the present motor. FIG.
Is an enlarged view of the rotor. Since the magnetized shape of the magnet ring is a simple spiral shape as shown in FIG. 5, the magnetized ring can be easily magnetized. The motor is easy to manufacture with a magnetized shape that can easily magnetize the magnet ring while simplifying the shape of the third yoke.

(Embodiment 2) FIGS. 6, 7 and 8 show Embodiment 2.
FIG. Reference numeral 8 denotes a first outer yoke made of a soft magnetic material. The teeth 8a and 8b are formed at positions where the teeth 5b and 5c of the first yoke 5 and the first magnetized layer of the permanent magnet 1 are sandwiched. Reference numeral 9 denotes a second outer yoke made of a soft magnetic material.
a and 9b are formed at positions sandwiching the teeth 6a and 6c of the second yoke 6 and the second magnetized layer of the permanent magnet 1. Reference numeral 10 denotes a connecting ring made of a non-magnetic material, and has an arc-shaped inner diameter 10.
a, 10b, the teeth 8a, 8b of the first outer yoke 8 and the teeth 9a, 9b of the second outer yoke 9 are fitted, and the first outer yoke 8, the second
The outer yoke 9 is fixed by a known method such as bonding.
The first outer yoke 8 and the second outer yoke 9 are fixed at a predetermined interval. Also, the teeth 8a, 8b of the first outer yoke 8
Are arranged facing the teeth 9a and 9b of the second outer yoke 9. First Embodiment Using First Outer Yoke 8 and Second Outer Yoke 9
The same function as that of the third yoke is performed.

As shown in FIG. 7, the first outer yoke 8 has one end connected to the first yoke 5 and covers the outer diameter of the coil 3, and the other ends 8a and 8b have outer teeth of the permanent magnet 1. The parts face each other with a predetermined gap in a predetermined angle range. As shown in FIG. 7, the second outer yoke 9 has one end connected to the second yoke 6 and covers the outer diameter of the coil 4, and the other end of the tooth 9
a and 9b are opposed to the outer peripheral portion of the permanent magnet 1 with a predetermined gap within a predetermined angle range. Since the first outer yoke 8 and the second outer yoke 9 are magnetically separated, the magnetic flux generated by the coil 3 does not pass through the second outer yoke and acts on the coil 4, and the magnetic flux generated from the coil 4 It does not act on the coil 3 through the first outer yoke, and the output is higher than in the first embodiment.

Since the magnetized shape of the magnet ring 1 is a simple spiral shape as shown in FIG. 5, it is easy to magnetize.
The shape of the connecting ring 10 is also simple. Further, FIG.
As shown in FIG.
Teeth 8a, 8b of outer yoke 8 and teeth 9 of second outer yoke 9
Since the portions without a and 9b can be the parallel surfaces 10c and 10d, the thickness T of the motor can be made thin. Also,
Although the magnet ring 1 is magnetized so that the outer and inner circumferential surfaces have different poles, it is possible to drive the magnet ring 1 only with the outer circumferential surface.

(Embodiment 3) FIGS. 9 and 10 are views showing Embodiment 3, and FIG. 9 is a perspective view of a second outer yoke. Second
The outer yoke 9 has teeth 9 a and 9 b formed in a spiral shape in parallel with the spiral magnetized shape of the magnet ring 1 as compared with the second embodiment. The same applies to the first outer yoke 8 (not shown). FIG. 10 is a plan view showing the relationship between the first outer yoke 8, the second outer yoke 9, and the magnet ring 1, and shows the teeth 8a and 8b (not shown) of the first outer yoke 8, and the teeth 9 of the second outer yoke 9.
a and 9b (not shown) have a spiral shape parallel to the magnetized shape of the magnet ring 1. According to this, the relationship between the magnet ring 1 and the teeth 8a and 8b of the first outer yoke 8 and the relationship between the magnet ring 1 and the teeth 9a and 9b of the second outer yoke 9 are just shifted by 45 °, and are stable. Rotation is obtained.

[0026]

As described above, according to the present invention,
It is possible to provide a small-diameter, high-output motor that is easy to manufacture.

[Brief description of the drawings]

FIG. 1 is a perspective view of a component according to a first embodiment.

FIG. 2 is a sectional view of the first embodiment after assembly.

FIG. 3 is a plan view illustrating a relationship between a yoke and a magnet ring according to the first embodiment.

FIG. 4 is a side view of the first embodiment after assembly.

FIG. 5 is an enlarged view of the rotor according to the first embodiment.

FIG. 6 is a perspective view of components of the second embodiment.

FIG. 7 is a sectional view of the second embodiment after assembly.

FIG. 8 is a sectional view taken along the line AA in FIG. 7 of the second embodiment.

FIG. 9 is a perspective view of a second outer yoke according to the third embodiment.

FIG. 10 is a plan view illustrating a relationship among a first outer yoke, a second outer yoke, and a magnet ring according to a third embodiment.

FIG. 11 is a sectional view of a conventional motor.

[Description of Signs] 1 Magnet ring 2 Rotary shaft 3 Coil 4 Coil 5 First yoke 6 Second yoke 7 Third yoke 8 First outer yoke 9 Second outer yoke

Claims (3)

[Claims] 1. A cylindrical shape which is divided into n portions in the circumferential direction and different poles are alternately magnetized, and has a spiral shape in which the magnetized shape is shifted by 180 ° / n from one end surface to the other end surface of the cylindrical shape. A magnet ring made of a permanent magnet; a rotor to which the magnet ring is fixed; a first coil and a second coil arranged concentrically with the rotor and sandwiching the magnet ring in the axial direction; A first yoke made of a soft magnetic material which is inserted into the inner diameter of the magnet ring and faces the inner diameter of the magnet ring with a clearance, and which is inserted into the inner diameter of the second coil and has a clearance in the inner diameter of the magnet ring A second yoke made of a soft magnetic material opposed to the first coil and a soft magnetic material covering the first coil and the second coil and covering a predetermined angle range of an outer diameter portion of the magnet ring. Motor, characterized in that it comprises a third yoke, the that. 2. A cylindrical shape which is divided into n in the circumferential direction and different poles are alternately magnetized, and has a helical shape in which the magnetized shape is shifted by 180 ° / n from one end surface to the other end surface of the cylindrical shape. A magnet ring made of a permanent magnet; a rotor to which the magnet ring is fixed; a first coil and a second coil arranged concentrically with the rotor and sandwiching the rotor in the axial direction; A first yoke made of a soft magnetic material inserted into the inner diameter portion and facing the inner diameter portion of the magnet ring with a clearance; and a first yoke inserted into the inner diameter of the second coil and having a clearance in the inner diameter portion of the magnet ring. A second yoke made of a soft magnetic material opposing the first yoke, and a magnetic pole part having one end connected to the first yoke and covering the outer diameter of the first coil and the other end facing the outer peripheral part of the magnet ring A soft magnetic material having a third yoke made of a soft magnetic material and a magnetic pole portion having one end connected to the second yoke and covering the outer diameter of the second coil and the other end facing the outer periphery of the magnet ring; And a connecting member made of a non-magnetic material that concentrically holds the third yoke and the fourth yoke. 3. The motor according to claim 2, wherein the magnetic pole portion of the third yoke or the magnetic pole portion of the fourth yoke is formed in a spiral shape in parallel with the magnetized shape of the magnet ring. A motor characterized in that: