JPH10215556A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor with a high power, while its outer dimensions are limited to being small. SOLUTION: 1st and 2nd magnetized layers of a cylindrical rotor are provided in the axial direction, so as to be adjacent to each other. The respective magnetized layers are divided into (n) sections in the circumferential direction and the respective sections are so magnetized as to have different polarities alternately. Further, a permanent magnet ring 1 which is magnetized so as to have phase differences of 180 deg./n is fixed. 1st and 2nd stator coils 3 and 4, which are arranged on the same axis as the permanent magnet ring 1 so as to have the permanent magnet ring 1 between them, cylindrical 1st and 2nd yokes 5 and 6 which are inserted into the respective coils, made of soft magnetic material and face the inner diameter parts of the 1st and 2nd magnetized layers of the magnet ring 1 with gaps therebetween and a 3rd yoke 7 which covers the 1st and stator coils 3 and 4, and the specified angle region of the outer diameter part of the magnet ring 1 and is made of soft magnetic material are provided. Holes 7g and 7h are formed in the parts of the 3rd yoke 7, corresponding to the boundary part of the 1st and 2nd magnetized layers of the rotor.

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 106 a 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 peripheral dimension of the motor becomes large. There was a disadvantage. The magnetic flux generated by energizing the stator coil 105 is mainly due to the stator teeth 106
a and 106b, the rotor magnet 11
1 does not work effectively, so there is a disadvantage that the output does not increase.

Accordingly, an object of the present invention is to increase the output while keeping the outer diameter of the motor small.

[0006]

In order to achieve the above object, a motor according to the present invention has a cylindrical shape, and is divided into n parts in a circumferential direction and different poles are alternately magnetized. The first magnetized layer is divided by n in the circumferential direction at a position adjacent to the first magnetized layer in the axial direction with a phase difference of 180 ° / n from the first magnetized layer to form different poles. The second magnetized alternately
A magnet ring made of a permanent magnet having a magnetized layer, a rotor to which the magnet ring is fixed, and a first coil arranged concentrically with the rotor and positioned so as to sandwich the magnet ring in the axial direction. A second coil and the first coil;
A cylindrical first yoke made of a soft magnetic material inserted into the inner diameter of the coil and opposed to the inner diameter portion of the first magnetized layer of the magnet ring with a gap, and inserted into the inner diameter of the second coil; A cylindrical second yoke made of a soft magnetic material opposed to the inner diameter portion of the second magnetized layer of the magnet ring with a gap, covering the first coil and the second coil, and And a third yoke made of a soft magnetic material and covering a predetermined angle range of the outer diameter portion. The third yoke faces a boundary between the first magnetized layer and the second magnetized layer of the rotor of the third yoke. A hole is formed in the portion.

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.

The magnetic flux generated by the first coil is transferred to the third yoke facing the outer peripheral surface of the first magnetized layer by the first yoke.
Passes between the first yoke opposed to the inner peripheral surface of the magnetized layer and effectively acts on the first magnetized layer, and the magnetic flux generated by the second coil generates the magnetic flux of the second magnetized layer. Since it passes between the third yoke facing the outer peripheral surface and the second yoke facing the inner peripheral surface of the second magnetized layer, it effectively acts on the second magnetized layer and increases the output of the motor.

Further, the first magnetized layer of the rotor and the second magnetized layer
Is 180 / n degrees out of phase with the magnetized layer, the shape of the third yoke can be simplified, and the motor can be manufactured easily.

In addition, since a hole is formed in a portion of the third yoke facing the boundary between the first magnetized layer and the second magnetized layer of the rotor, the resistance of the portion is increased, and The magnetic flux generated by the coil hardly acts on the second coil side or the second magnetized layer, and the magnetic flux generated by the second coil hardly acts on the first coil side or the first magnetized layer. Therefore, the output of the motor increases.

In order to achieve the above object, a motor according to the present invention is secondly provided with a first magnetized layer having a cylindrical shape, divided into n portions in the circumferential direction, and having different poles alternately magnetized. 180 ° with the first magnetized layer at a position adjacent in the direction parallel to the axis.
A magnet ring made of a permanent magnet having a second magnetized layer in which the / n phase is shifted and n is divided in the circumferential direction and different poles are alternately magnetized, and the magnet ring is fixed. A rotor; a first coil and a second coil arranged concentrically with the rotor and sandwiching the magnet ring in the axial direction; and a first magnetized magnet ring inserted into the inner diameter of the first coil and being magnetized. A cylindrical first yoke made of a soft magnetic material opposed to the inner diameter of the layer with a clearance, and a clearance inserted in the inner diameter of the second magnetized layer of the magnet ring inserted into the inner diameter of the second coil. A cylindrical second yoke made of a soft magnetic material,
A third yoke covering the coil and the second coil and covering a predetermined angle range of an outer diameter portion of the magnet ring, and made of a soft magnetic material, wherein the first magnetizing of the rotor of the third yoke is performed. The width of a portion facing the boundary between the layer and the second magnetized layer is smaller than the width of the portion facing the first magnetized layer or the second magnetized layer.

In the above configuration, since the first coil and the second coil are arranged at positions sandwiching the magnet ring, the outer diameter of the motor is reduced.

The magnetic flux generated by the first coil passes between the third yoke facing the outer peripheral surface of the first magnetized layer and the first yoke facing the inner peripheral surface of the first magnetized layer. Therefore, the magnetic flux generated by the second coil effectively acts on the first magnetized layer, and the magnetic flux generated by the second coil and the third yoke facing the outer circumferential surface of the second magnetized layer and the inner circumferential surface of the second magnetized layer Since it passes between the second yoke and the second yoke, it effectively acts on the second magnetized layer and increases the output of the motor.

Further, the first magnetized layer of the rotor and the second magnetized layer
The phase of the third yoke is shifted by 180 / n degrees from the magnetized layer, so that the shape of the third yoke can be simplified and the motor can be manufactured easily.

Further, by reducing the width of the portion of the third yoke facing the boundary between the first magnetized layer and the second magnetized layer of the rotor, the magnetic resistance of the portion is increased, and The magnetic flux generated by the first coil hardly acts on the second coil side or the second magnetized layer, and the magnetic flux generated by the second coil acts on the first coil side or the first magnetized layer. And the output of the motor increases.

[0016]

【Example】

(Embodiment 1) FIGS. 1 to 4 show Embodiment 1 of the present invention. 1 to 4, reference numeral 1 denotes a cylindrical magnet ring, which is made of a permanent magnet, and its circumference is divided into n parts (in this embodiment, divided into four parts), and S and N poles are alternately magnetized. A first magnetized layer composed of 1a, 1b, 1c, and 1d and a 1-magnet in which the circumference is divided into four parts and the S pole and N pole are alternately magnetized.
e, 1f, 1g and 1h. The phase of the first magnetized layer and the second magnetized layer is 180 / n
, That is, 45 degrees. In this embodiment, the first magnetized layer 1a and 1c and the second magnetized layer 1a
e, the outer peripheral surface of 1g is magnetized so as to be an S pole and the inner peripheral surface is an N pole, and the outer peripheral surfaces of the first magnetized layers 1b, 1d and 1f, 1h of the second magnetized layer are The poles and the inner peripheral surface are magnetized so as to be S poles.

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

Reference numeral 6 denotes a second yoke made of a soft magnetic material. The second yoke 6 is inserted into the inner diameter portion 4a of the coil 4, and the teeth 6b facing the inner diameter portion of the second magnetized layer of the permanent magnet 1.
6c. The teeth 6b, 6c are 360 / (n / 2) degrees, that is, 1 so that they are in phase with the poles of the second magnetized layer.
It is formed shifted by 80 °. 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,
It is configured to cover the outer periphery of the permanent magnet 1. The third yoke 7 is connected to the 5e portion of the first yoke 5 at the 7e portion,
The portion f is coupled to the portion 6e of the second yoke 6. Also, the third
The yoke 7 includes the teeth 5b and 5c of the first yoke 5, the second yoke 6
Position 7 that faces the teeth 6b and 6c of the
There are portions a and 7b, and holes 7c and 7d are formed in other portions. Since the teeth 5b, 5c of the first yoke 5 and the teeth 6b, 6c of the second yoke 6 have the same phase, the magnetic pole portions 7a, 7b of the third yoke 7 to be opposed to those teeth are shown in FIG.
As shown in (1), it has a simple shape and is easy to manufacture by a press or the like. Holes 7g and 7h are formed in the magnetic pole teeth 7a and 7b of the third yoke 7 at positions facing the vicinity of the boundary between the first magnetized layer and the second magnetized layer of the magnet ring 1.

As a result, the magnetic resistance near the third yoke 7 increases, and the magnetic flux generated from the coil 3 hardly acts on the coil 4, the second magnetized layer of the magnet ring 1, the second yoke 6, and the like. The magnetic flux generated from the coil 4 is
Or the first magnetized layer of the magnet ring 1, the first yoke 5, and the like, and can smoothly rotate according to the operation described later, and the output of the motor increases.

FIG. 2 is a cross-sectional view after assembly. FIGS. 3A, 3B, 3C, and 3D show AA cross sections in FIG. 2 and FIGS. 3E, 3F, and 3F. g) and (h) show BB cross sections in FIG. 2. 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.

3 (a) and 3 (e), 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 7 facing the teeth 5b and 5c. 7a, 7
b is the N pole, the teeth 6b and 6c of the second yoke 6 are the S pole, and the teeth 6
When the poles 7a and 7b of the third yoke 7 facing the poles b and 6c are excited to the N pole, the magnet ring 1 rotates 45 ° left (counterclockwise), and the state shown in FIGS. 3B and 3F. become.

Next, energization of the coil 3 is reversed, the teeth 5b and 5c of the first yoke 5 are set to the N pole, the 7a and 7b of the third yoke 7 facing the teeth 5b and 5c are set to the S pole, and the second yoke 6 is set to the S pole. Tooth 6
b and 6c are S poles and a third yoke 7 facing the teeth 6b and 6c.
When magnets 7a and 7b are excited to the N pole, the magnet ring 1
Is further rotated counterclockwise by 45 °, and the state shown in FIGS. 3C and 3G is obtained.

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 7a and 7b of the third yoke 7 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 motor.

(Embodiment 2) FIGS. 5 and 6 show Embodiment 2 of the present invention. 5 and 6, reference numeral 1 denotes a cylindrical magnet ring, which is made of a permanent magnet, and its circumference is divided into n parts (in this embodiment, divided into four parts), and S and N poles are alternately magnetized. A first magnetized layer composed of 1a, 1b, 1c, and 1d, and a second magnetized layer composed of 1e, 1f, 1g, and 1h in which the circumference is equally divided into four and S and N poles are alternately magnetized. And layers. The phase of the first magnetized layer and the phase of the second magnetized layer are 180
/ N degrees, ie, 45 °. In this embodiment, the first magnetized layer 1a and 1c and the second magnetized layer 1a
e, the outer peripheral surface of 1g is magnetized so as to be an S pole and the inner peripheral surface is an N pole, and the outer peripheral surfaces of the first magnetized layers 1b, 1d and 1f, 1h of the second magnetized layer are N poles. The poles and the inner peripheral surface are magnetized so as to be S poles.

Reference numeral 2 denotes a rotating shaft to which the permanent magnet 1 is fixed. The rotating shaft 2 and the permanent magnet 1 constitute a rotor described in the claims. Reference numerals 3 and 4 denote coils, and the permanent magnet 1
And is disposed at a position where the permanent magnet 1 is sandwiched in the axial direction. Reference numeral 5 denotes a first yoke made of a soft magnetic material. The first yoke 5 includes a 5d portion inserted into the inner diameter portion 3a of the coil 3 and teeth 5b, 5c facing the inner diameter portion of the first magnetized layer of the permanent magnet 1. Have. The teeth 5b, 5c are 360 / (n / 2) degrees, that is, 180 ° so that they are in phase with the poles of the first magnetized layer.
The hole 5a of the first yoke and the two
The portion a is rotatably fitted.

Reference numeral 6 denotes a second yoke made of a soft magnetic material. The second yoke 6d is inserted into the inner diameter portion 4a of the coil 4, and the teeth 6b facing the inner diameter portion of the second magnetized layer of the permanent magnet 1.
6c. The teeth 6b, 6c are 360 / (n / 2) degrees, that is, 1 so that they are in phase with the poles of the second magnetized layer.
It is formed shifted by 80 °. 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,
It is configured to cover the outer periphery of the permanent magnet 1. The third yoke 7 is joined at 7e to the 5e portion of the first yoke 5 at a portion,
The portion 7f is coupled to the portion 6e of the second yoke 6. The third yoke 7 has positions 7a and 7b facing the teeth 5b and 5c of the first yoke 5 and the teeth 6b and 6c of the second yoke 6 with the permanent magnet 1 interposed therebetween. Holes 7c, 7d
Are formed. The teeth 5b and 5c of the first yoke 5 and the second
Since the teeth 6b and 6c of the yoke 6 have the same phase, the magnetic pole portions 7a and 7b of the third yoke 7 to be opposed to those teeth are shown in FIG.
As shown in (1), it has a simple shape and is easy to manufacture by a press or the like. The magnetic pole teeth 7a, 7b of the third yoke 7 have narrower widths 7i, 7j at positions facing the vicinity of the boundary between the first magnetized layer and the second magnetized layer of the magnet ring 1 than at other positions.
Are formed.

As a result, the magnetic resistance increases near the third yoke 7 and the magnetic flux generated from the coil 3 hardly acts on the coil 4, the second magnetized layer of the magnet ring 1, the second yoke 6, and the like. The magnetic flux generated from the coil 4 is
Or the first magnetized layer of the magnet ring 1, the first yoke 5, and the like, and can smoothly rotate according to the operation described in the first embodiment, and the output of the motor increases.

[0030]

As described above, according to the present invention,
A motor that is easy to manufacture and has a small diameter, smooth rotation, and high output can be obtained.

[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 at the time of assembly.

FIG. 3 is a diagram illustrating a rotor, a first yoke, and a second yoke according to the first embodiment;
It is sectional drawing which shows the relationship of a yoke and a 3rd yoke.

FIG. 4 is a plan view of the first embodiment at the time of assembly.

FIG. 5 is a perspective view of components of the second embodiment.

FIG. 6 is a plan view of the second embodiment at the time of assembly.

FIG. 7 is an example of a conventional step motor.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 permanent magnet 2 rotating shaft 3 coil 4 coil 5 first yoke 6 second yoke 7 third yoke

Claims (2)

[Claims] 1. A first magnetized layer having a cylindrical shape, divided into n portions in a circumferential direction and having different poles alternately magnetized, and a position adjacent to the first magnetized layer in an axial direction. And a second magnetized layer which is divided by n in the circumferential direction with a 180 ° / n phase shift from the first magnetized layer and has different poles alternately magnetized. A magnet ring, 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, and inserted into an inner diameter of the first coil. A first cylindrical yoke made of a soft magnetic material and having a clearance facing the inner diameter of the first magnetized layer of the magnet ring; Soft facing the inner diameter of the magnetized layer 2 with a gap A cylindrical second yoke made of a magnetic material; and a third yoke made of a soft magnetic material that covers the first coil and the second coil and covers a predetermined angle range of an outer diameter portion of the magnet ring. A motor is characterized in that a hole is formed in a portion of the third yoke facing a boundary between the first magnetized layer and the second magnetized layer of the rotor. 2. The first magnetized layer is located at a position adjacent to a first magnetized layer, which has a cylindrical shape, is divided into n in the circumferential direction, and different poles are alternately magnetized, in a direction parallel to an axis. 180 ° with layer
A magnet ring composed of a permanent magnet having a second magnetized layer in which the / n phase is shifted and n is divided in the circumferential direction and different poles are alternately magnetized, and the magnet ring is fixed. A rotor; a first coil and a second coil arranged concentrically with the rotor and sandwiching the magnet ring in the axial direction; and a first magnetization of the magnet ring inserted into an inner diameter of the first coil. A cylindrical first yoke made of a soft magnetic material opposed to the inner diameter portion of the layer with a clearance, and a clearance inserted in the inner diameter of the second magnetized layer of the magnet ring inserted into the inner diameter of the second coil. A cylindrical second yoke made of a soft magnetic material which is opposed to the first and second coils, and a third magnetic material made of a soft magnetic material which covers the first coil and the second coil and covers a predetermined angle range of an outer diameter portion of the magnet ring. York and A width of a portion of the third yoke opposed to a boundary between the first magnetized layer and the second magnetized layer of the rotor is opposed to the first magnetized layer or the second magnetized layer; A motor that is narrower than the width of the portion.