JP3052108B2 - Ring type motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ring type motor, for example, a ring type motor which is housed in a lens barrel of a camera and is used for driving a lens frame and for driving a shutter ring. About.

[0002]

2. Description of the Related Art Various types of ring-type motors have been proposed, examples of which are shown in FIGS. In addition,
FIG. 7 is a partially cutaway side view of a ring type motor, and FIG. 8 is a partial perspective view showing a main part of the motor.

This ring type motor comprises a stator comprising a first yoke 11 and a second yoke 12, a first excitation coil 13 provided on the first yoke 11, and a second yoke. A second excitation coil 14 provided in the work 12
Data 15.

The first and second yokes 11 and 12 are ring members formed of the same shape by a magnetic material. These ring members 1 are made of a non-magnetic material so that they face each other at an appropriate interval.
6 are connected. The first yoke 11 and the second yoke 12 are provided with outer magnetic pole teeth 11a and 12a and inner magnetic pole teeth 11b and 12b.

A large number of outer magnetic pole teeth 11a and 12a are formed on the outer circumference of the ring at the same pitch (P) interval.
The inner magnetic pole teeth 11b are provided on the inner circumference of the ring so as to face the outer magnetic pole teeth 11a, and the inner magnetic pole teeth 12b face the outer magnetic pole teeth 12a. The second yoke 12
Are located at positions where the magnetic pole teeth 12a and 12b are shifted from the magnetic pole teeth 11a and 11b of the first yoke 11 by a half pitch (P / 2).

The first yoke 11 has outer magnetic pole teeth 11.
a, the inner magnetic pole teeth 11b and a first exciting coil 13 for exciting the magnetic poles to different polarities, and the second yoke has outer magnetic pole teeth 12a.
A second excitation coil 14 for exciting the magnetic pole teeth 12b and the inner peripheral magnetic pole teeth 12b to different polarities is provided.

The rotor 15 is a ring composed of a multi-pole magnet, and includes a first yoke 11 and a second yoke 12.
N and S poles are alternately connected with a magnetic pole width corresponding to the magnetic pole tooth pitch (P). On the inner peripheral surface of the rotor 15, a flange portion 17a of a rotating ring 17 is fixed.
5 is supported so as to be located between the magnetic pole teeth of the first and second yokes 11 and 12.

The rotary ring 17 is a cylindrical body that rotates around the center of the stator ring, and is rotatably fitted on the outer peripheral surface of a cylindrical fixed ring 18. A bearing 19 is provided between the rotating ring 17 and the fixed ring 18 to support the rotating ring 17.

The above-mentioned ring-shaped motor supplies a pulse to the first exciting coil 13 and the second exciting coil 14 to excite the magnetic pole teeth of the first and second yokes 11 and 12, thereby turning the rotor off. The rotor 15 rotates, and a rotation output can be obtained from the rotation ring 17. This ring type motor was developed by the inventor of the present invention and is disclosed in Japanese Patent Application No. 3-25047.
(Japanese Patent Application Laid-Open No. 4-244774).

[0010]

SUMMARY OF THE INVENTION
The motor has a motor form with a small width, and is rotatably driven by a ring-shaped rotor. Therefore, the motor is incorporated into a lens barrel of a camera, and is extremely advantageous as a motor for driving a lens frame, a shutter frame, and the like. Becomes

However, since such a ring type motor does not have a rotating shaft like a general motor, there is a problem that a drive output cannot be efficiently taken out. It is necessary to devise, for example, to provide 19.

In view of the above circumstances, an object of the present invention is to develop a ring-type motor capable of obtaining a high-efficiency drive output without separately providing a bearing or the like.

[0013]

In order to achieve the above-mentioned object, according to the present invention, a circular ring made of a magnetic material is provided, and a predetermined distance is provided between the ring and the ring and the ring is polymerized. In addition to a ring, a yoke having a number of magnetic pole teeth around the ring body and an exciting coil provided on the yoke constitute a stator. And a plurality of magnet rotators revolving while rotating on the ring body in accordance with the excitation of the magnetic pole teeth of the stator, and receiving the revolving force of these magnet rotators, the circular center of the ring body The present invention proposes a ring-shaped motor characterized in that a rotor is constituted by a driving ring that rotates about a center point.

[0014]

When the excitation coil is supplied with a pulse, the magnetic pole teeth of the stator are excited to generate a rotating magnetic field. Due to this rotating magnetic field, the magnet rotator moves on the ring while rotating. In other words, the magnet rotator rotates while rolling on the ring body due to the generation of a rotating magnetic field because the magnet rotator is attracted to the ring body by magnetic attraction.

As described above, the plurality of magnet rotators revolve while rotating on the ring body, and the drive ring is rotated by receiving the revolving force. As a result, the rotational force of the drive ring centering on the circular center of the ring body is output.

[0016]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway front view of a ring type motor.
FIG. 2 is a partial perspective view showing a main part of the motor.

As shown in the figure, the ring type motor comprises a ring body 21, a first yoke 22 and a second yoke 23, an excitation coil 24 provided on the first yoke 22, and a second yoke. A stator is constituted by the exciting coil 25 provided on the
Further, a rotor is constituted by a plurality of magnet rotators 26a to 26x and a drive ring 27 which supports the magnet rotators.

The ring body 21 is formed by forming a magnetic plate into a circular ring, which is provided with recesses formed continuously at equal intervals along the outer periphery, and a nonmagnetic material 21a is embedded in the recesses. is there.

The first yoke 22 and the second yoke 23 are circular rings having a diameter larger than that of the ring body 21, and are arranged on the ring body 21 with a predetermined interval provided therebetween. is there. Also, the first yoke 22 and the second yoke 2
Reference numeral 3 denotes the same shape, both of which have a U-shaped cross section, and are provided with bent magnetic pole teeth on the inner peripheral side. That is,
The magnetic pole teeth 22A ₁ , 22B ₁ , 2
2A ₂ , 22B ₂ ... Are provided, and these magnetic pole teeth are excited by the power supply of the first exciting coil 24.

The same applies to the second yoke 23.
Magnetic pole teeth 23A ₁ , 23B ₁ , 23A ₂ , 23B _2.
Are provided, and these magnetic pole teeth are provided in the second exciting coil 25.
Is excited by the power supply. The magnetic pole teeth of the second yoke 23 are shifted from the magnetic pole teeth of the first yoke 22 by 1/2 pitch, and these magnetic pole teeth are shown in a developed view in FIG. Are arranged.

The first exciting coil 24 and the second exciting coil 25 are coils wound in an annular shape, and the first yoke 22 and the second
The first exciting coil 24 excites the magnetic pole teeth in the rows A and B of the first yoke 22 to have different poles, and the second exciting coil 25 is mounted on the second yoke 23 along the ring of the yoke 23. The magnetic pole teeth of the rows A and B of the negative pole 23 are excited to different polarities.

Each of the magnet rotators 26a to 26x
The roller has a circular cross-section, and is magnetized on one side with an N pole and the other side with an S pole along the longitudinal direction. Note that the number of poles of the magnet rotators 26a to 26x is not limited to two, and can be arbitrarily increased.

Further, these magnet rotators 26a to 26
x are arranged at equal intervals on the ring body 21 so as to be in contact with the outer peripheral surface of the ring body 21. These magnet rotators 26a to 26x
7 and rotatably mounted.

The ring type motor constructed as described above is
By supplying pulse power to the first excitation coil 24 and the second excitation coil 25, the magnetic pole teeth of the first and second rows 22A and B are excited to different polarities, and similarly, the second yoke 23 The magnetic pole teeth of row A and row B are excited to different polarities, so that the magnet rotators 26a to 26x repeatedly repel and attract the magnetic poles of each magnetic pole tooth, and move while rolling on the ring body 21. .
Since the ring body 21 is provided with the non-magnetic material 21a, the stationary and rolling of the magnet rotator is repeated at an accurate position.

Referring to FIGS. 4 and 5, the rotation and revolution of the magnet rotator will be specifically described. The pulse P in FIG.
₁ shows a pulse waveform for feeding to the first exciting coil 24, a pulse P ₂ shows a pulse waveform for feeding to the second excitation coil 25.

When power is supplied with such pulses P ₁ and P ₂ ,
Since the first exciting coil 24 in the second excitation coil 25 a current flows in opposite directions, in the power feed time T _1, the first yaw - magnetic pole teeth 22A ₁ column A of the click 22, 22A ₂ ·
··· is the N pole, B row of magnetic pole teeth 22B ₁ , 22B ₂ ···
... is excited to S pole, and the second yaw - the magnetic pole teeth 23A ₁ column A of the click 23, 23A ₂ · · · · · · S pole, the magnetic pole teeth 23B of row B _1, 23B ₂ ... are excited to the N pole.

That is, in the power supply time T ₁ , the first and second yaw
Are excited as shown in FIG. 5 (A), and the magnet rotators 26a, 26b... Rotate as shown in FIG. Of the magnetic pole teeth indicated by quadrilaterals in FIG. 5, blank poles indicate N poles, and shaded poles indicate S poles.

When the power supply time advances to T ₂ , the pulse current flowing through the second exciting coil 25 is switched so as to be in the same direction as the first exciting coil 24, so that the second yoke 23 in the row A The magnetic pole teeth 23A ₁ , 23A ₂ ... Become N poles, and the magnetic pole teeth 23B ₁ , 23B ₂ .
The excitation state shown in FIG. Therefore, the magnet rotators 26a, 26b,... Repel the excitation of the magnetic pole teeth, and are attracted, as shown in FIG.
From the position shown in FIG. 5 (A), it rolls clockwise and makes 1/8 turn.

When the power supply time T ₃ is reached, the pulse current flowing through the first exciting coil 24 is inverted, so that the first yoke 2
The excitation of the magnetic pole teeth of No. 2 is reversed, and the excitation state shown in FIG. 5C is established, and the magnet rotators 26a, 26b,...
Rolls further clockwise and makes 1/8 of a turn.

Similarly, as the power supply time advances to T ₄ , T ₅ , T ₆ , and T ₇ , the magnetic pole teeth of the first and second yokes are changed to those shown in FIGS. 5 (D), (E), and (F). ) And (G) are excited in this order, and the magnet rotators 26a, 26b,.
... rotates. Hereinafter, the magnet rotator rotates similarly.

As described above, the first and second excitation coils 2
By supplying the pulses 4 and 25 with the pulses P ₁ and P ₂ , the magnet rotators 26 a, 26 b,... Revolve clockwise while rotating on the ring body 21. Since all the revolving forces of the magnet rotators 26a, 26b,... Are applied to the drive ring 27, the drive ring 27 is driven to rotate about its center point 0.

FIG. 6 is a front view of a ring type motor showing another embodiment. In this embodiment, a plurality of magnet trawlers 26 and bearing rollers 29 are alternately arranged on the ring body 21.
Are arranged around the outer periphery of the drive ring 21 so that each bearing roller 29 is rotatably supported by the drive ring 21.

In the ring type motor constructed as described above, the magnet rotator 26 revolves while rotating in the same manner as described above by pulse power supply, so that the bearing roller 29 rotates in accordance with the rotation of the magnet rotator 26 and the revolution. Ring body 2
Roll over 1 Thus, the drive ring 27 receives the moving force (revolution force) of the bearing roller 29 and is driven to rotate.

Although the preferred embodiment of the present invention has been described above, the first and second yokes 22 and 23 are not necessarily formed as outer rings of the ring body 21 and the first and second yokes 22 and 23 are not necessarily formed as outer rings. It is also possible to dispose as an inner ring of the ring body 21 and provide a magnet rotator between the ring body 21 and the first and second yokes.

In the embodiment shown in FIG. 6, the magnet roller 26 may be supported by the drive ring 27 without supporting the bearing roller 29, and the magnet roller 26 may be supported by the drive ring 27. Each time several bearings are arranged, the bearing rollers 29
Is optional.

[0036]

As described above, in the ring type motor of the present invention, a plurality of magnet rotators provided between the ring and the yoke revolve on the ring while revolving. Since the revolving force of the trochanter is transmitted to the drive ring to rotate and output, a high-efficiency motor with a small rotating cost is obtained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a ring-shaped motor showing one embodiment of the present invention.

FIG. 2 is a partial perspective view showing a main part of the ring type motor.

FIG. 3 is a partial development view of the ring type motor.

FIG. 4 is a pulse waveform diagram for supplying power to a ring type motor.

FIG. 5 is an explanatory diagram of the operation of the above-mentioned ring type motor.

FIG. 6 is a partially cutaway front view of a ring-shaped motor showing another embodiment of the present invention.

FIG. 7 is a partially cutaway side view of a ring type motor shown as a conventional example.

FIG. 8 is a partial perspective view showing a main part of a conventional ring-shaped motor.

[Explanation of symbols]

21 ring members 21a non-magnetic material 22 first Yo - click _{22A 1, 22B 1, 22A 2} , 22B 2 ····· magnetic pole teeth 23 and the second yaw - click _{23A 1, 23B 1, 23A 2} , 23B 2 ·· ... Magnetic pole teeth 24 First excitation coil 25 Second excitation coil 26a to 26x Magnet rotator 27 Drive ring

Continuation of the front page (56) References JP-A-62-141955 (JP, A) JP-A-1-129756 (JP, A) JP-A-61-62354 (JP, A) Real opening 58-172385 (JP) , U) Fully open 1979-53515 (JP, U) Fully open 1987-101382 (JP, U) Fully open hei 2-94490 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB) (Name) H02K 37/04

Claims (1)

(57) [Claims] 1. A circular ring made of a magnetic material, and a ring provided with a predetermined interval between the ring and a ring that overlaps with the ring, and a number of magnetic pole teeth around the ring facing the ring. And a exciting coil provided on the yoke, constitutes a stator, and is arranged in a ring shape between the ring body and the yoke. A rotor is composed of a plurality of magnet rotators that revolve while rotating on the ring body according to excitation, and a drive ring that receives the revolving force of these magnet rotators and rotates around the circular center of the ring body as a center point. A ring-shaped motor characterized by the following.