JP3283710B2 - Multi-axis synchronous reversing drive 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 two-shaft or more multi-shaft synchronous reversing drive motor, and more particularly, to a two-shaft gear pump, a rudder,
The present invention relates to a multi-axis synchronous inversion drive motor suitable as a drive motor for a device such as a blower, a screw compressor, and the like that simultaneously inverts and rotates a multi-axis.

[0002]

2. Description of the Related Art Conventionally, this kind of technique is disclosed in
There is one disclosed in JP-A-8143. 6A and 6B show the structure of a conventional two-axis synchronous reversing motor. FIG. 6A is a side sectional view, and FIG. 6B is a front sectional view. As shown in the figure, this type of motor has two rotors 2 with permanent magnets installed on the outer periphery.
3. Arranged such that the rotors 24 are in contact with each other or a predetermined gap is maintained, and the magnetic pole surfaces of the respective rotors constitute a magnetic coupling for attracting the rotors in opposition to each other; And the armature 27 of each rotor generates a spatially moving magnetic field (rotating magnetic field) that rotates in the opposite direction to each other.
Rotate in opposite directions.

[0003] In addition, such two-axis (or multi-axis)
For a device that requires simultaneous reverse rotation of a motor, a method of mechanically and synchronously inverting two axes (or multiple axes) using a gear with one motor (one axis) may be adopted.

[0004]

However, the method using the gears or the like requires a timing gear, and has a problem that it is difficult to reduce the size and noise is large.

[0005] Further, as shown in FIG.
3. When the rotors 24 are in contact with each other and the shafts 21 and 22 are supported in parallel, the noise also increases. When the shafts 21 and 22 are supported by providing a gap, two rotors 23 and
Attraction is exerted between the rotors 24 by a magnetic coupling action, and the bearings 25 and 26 are subjected to excessive eccentric weight in the radial direction, making it difficult to rotate stably at high speed. Also, since the armature 27 is installed on the outer periphery,
There is a problem that it is structurally difficult to balance the rotors 23 and 24 by applying a constant magnetic attraction force in the opposite direction that cancels out excessive eccentric load.

Further, according to the motor of the above-mentioned type, the armature 27 is not arranged 360 degrees around each of the two rotors 23 and 24, so that the driving force is inferior, and the rotors 23 and 24 are biased. A driving force is generated.
For this reason, the motor disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 4-178143 is a motor having a large shape especially for the driving force. Therefore, there is a problem that it is unsuitable for a device requiring a large driving force.

The present invention has been made in view of the above points, and eliminates the above-mentioned problems, balances the eccentric load due to the magnetic coupling of the two rotors, and stably rotates the two rotors synchronously at high speed. It is an object of the present invention to provide a multi-axis synchronous reversing motor that can perform the operation.

[0008]

In order to solve the above-mentioned problems, according to the present invention, as shown in FIG. 1, a multi-axis synchronous inversion drive motor is driven by armatures (2A) and (2B) for generating a spatially moving magnetic field.
And an outer rotor type brushless DC having permanent magnets (7) rotating around the armatures (2A) and (2B) by the spatially moving magnetic field and arranged in a cylindrical shape. Connect the motor to two or more rotors (3
A) and the rotor (3B) are arranged in parallel while maintaining a predetermined interval (t), and the different magnetic pole surfaces of the rotors (3A) and (3B) are attracted to face each other to form a magnetic coupling. The adjacent rotors (3A) and (3B) are configured to rotate in opposite directions.

Further, the rotors (3A) and (3B) on which the permanent magnets (7) are arranged are provided with yoke portions (6A) and (6B) using a thin magnetic material on the outer periphery.

Further, the rotors (3A) and (3B) on which the permanent magnets (7) are arranged are provided with yoke portions (6A) and (6B) using a non-magnetic material.

Further, yoke portions (6A), (6) are provided around rotors (3A), (3B) on which permanent magnets (7) are arranged.
B) and a notch is provided in each of the yoke portions (6A) and (6B) as shown in FIG.

A permanent magnet (7 ') similar to the inner peripheral surface is provided around the outer peripheral surface of the rotors (3A) and (3B) on which the permanent magnets (7) are arranged as shown in FIG. It is characterized by being inverted.

As shown in the figure, two rotors (3
A) A pair of magnetic bodies (5A) and (5A) that apply a suction force in the opposite direction to the suction force of the magnetic coupling between (3B).
B) is fixedly arranged on the opposite side of the facing surfaces of the two rotors while maintaining a predetermined gap with the rotors.

Further, as shown in FIG. 5, a pair of magnetic members (5A) for applying a suction force in a direction opposite to the suction force of the magnetic coupling between the three or more rotors (3A), (3B), (3C). ) And (5B) are characterized in that they are fixedly arranged on the side of three or more rotors that do not have opposing surfaces while maintaining a predetermined gap with the rotors.

Further, as shown in FIG.
A) and (3B), each of which has a permanent magnet having a different number of magnetic poles, and synchronously inverts at a constant rotational speed ratio according to the magnetic pole ratio of the rotor.

[0016]

According to the present invention, the armatures (2A) and (2B) are provided by arranging the armatures (2A) and (2B) at predetermined intervals on the inner periphery of the rotors (3A) and (3B). The spatially moving magnetic field works over the entire circumference of the rotor, and leakage of the spatially moving magnetic field is reduced as much as possible, so that the adjacent rotors (3A) and (3B) rotate synchronously and reversely with good balance.

Further, the yoke portions (6A) and (6B) on the outer peripheral surfaces of the plurality of rotors (3A) and (3B) are made of a thin magnetic material or a non-magnetic material, or the notch portions are formed as shown in FIG. With this arrangement, the attractive force of the magnetic coupling between the plurality of adjacent rotors (3A) and (3B) is enhanced by the action of the leakage magnetic flux on the outer peripheral surface of the permanent magnets of the rotors (3A) and (3B). Even if one of the plurality of rotors (3A) and (3B) receives a biased load torque, the synchronous reversal drive is performed by the attractive force of the magnetic coupling by the remaining one (3A) and (3B). Can be easily maintained.

Further, a pair of magnetic bodies capable of obtaining an attraction force in the opposite direction balanced with the attraction force between the different magnetic poles of the permanent magnets provided around the two rotors (3A) and (3B),
By fixedly arranging the two rotors on opposite sides of the opposing surfaces with a predetermined gap therebetween, the attractive force of the magnetic coupling is canceled out, and the axial center of each of the rotors (3A) and (3B) is canceled. The target balanced torque can be obtained. Therefore, the rotors (3A) and (3B) are in a non-contact state, and the unbalanced loads are removed from the rotors (3A) and (3B) and the bearings, both at rest and at high speed. Since the rotors (3A) and (3B) are arranged with a predetermined gap therebetween, even if the rotors are synchronously inverted at high speed, noise is reduced and the life is extended.

Further, as shown in FIG. 5, a pair of at least three (in the figure, three) rotors that can obtain an attraction force in the opposite direction balanced with the attraction force between the different magnetic poles of the permanent magnets provided around the rotor. The magnetic members (5A) and (5B) are fixedly arranged on the side of the three or more rotors having no opposing surface with a predetermined gap between them, thereby canceling the attractive force of the magnetic coupling. A balanced torque symmetrical with respect to the axis of the rotors (3A), (3B) and (3C) can be obtained. Therefore, the rotors (3A), (3B), and (3C) are in a non-contact state even when stationary or rotating at high speed.
An unbalanced load is removed from each of the rotors (3A), (3B), (3C) and the bearing. Since three or more rotors are arranged with a predetermined gap therebetween, a long life can be obtained even if the rotors are synchronously inverted at high speed.

As shown in FIG. 3, the rotor (3A)
By installing permanent magnets (7 ') on the outer peripheral surfaces of the yokes (6A) and (6B) in the same manner as the inner peripheral surface of the (3B), between the two adjacent rotors (3A) and (3B), respectively. Of the magnetic coupling of the rotor is enhanced, and a plurality of rotors (3
Even when an unbalanced biased load is applied to (A) and (3B), synchronous reversal rotation can be easily maintained by the magnetic coupling action of the adjacent rotors (3A) and (3B).

Further, as shown in FIG.
A), by making the number of poles of the permanent magnet (7) surrounding the rotor (3B) different from each other instead of being the same,
A) and (3B) can be reversely rotated at a constant rotational speed ratio according to the magnetic pole ratio. The two shafts do not have the same speed,
As in the case of driving a screw compressor, the two shafts can be rotated at high speed synchronously while maintaining a constant rotational speed ratio.

[0022]

[Example 1]

FIG. 1 is a sectional view showing the structure of a two-axis synchronous inversion drive motor according to the present invention. The two rotatable rotors 3A and 3B are cylindrical in shape so that magnetic fluxes a and b are generated in the radial direction at regular intervals symmetrically about the axis with 2n poles (n = 2 in the figure). It is installed on the inner circumference of the yokes 6A, 6B. That is, in this two-axis synchronous inversion drive motor, the number of poles of the permanent magnets 7 of the two rotors 3A and 3B is n = 2.
And four poles of S, N, S and N are connected to each rotor 3
A, 3B are provided on the inner periphery of the yokes 6A, 6B. A predetermined gap t (clearance) is provided between the two rotors 3A and 3B.

An armature 2A comprising a stator core 1A and a coil 4 is fixedly arranged inside the rotor 3A.
Similarly, an armature 2B including a stator core 1B and a coil 4 is fixedly arranged inside the rotor 3B. Armatures 2A, 2B each having a coil 4 are fixedly disposed inside the stator cores 1A, 1B with a predetermined gap from the magnetic pole surfaces of the rotors 3A, 3B. The armatures 2A and 2B each have a total of six magnetic pole teeth of U, V, W, X, Y and Z, and each coil 4 is supplied with, for example, a three-phase alternating current. Armature 2A and armature 2B are arranged symmetrically with respect to center line m.

When the rotors 3A and 3B rotate in opposite directions, different magnetic pole surfaces are attracted to the N and S poles of the rotors 3A and 3B, respectively, so that magnetic flux c forms a magnetic coupling. At this time, the two rotors 3A and 3B
The suction force between them is inversely proportional to the size of the gap t. In order to cancel the suction force, the respective rotors 3A and 3B may be sucked with the same magnitude in the opposite direction to the suction force.
For this purpose, balance magnetic bodies 5A and 5B are provided outside the two rotors 3A and 3B.

The balance magnetic members 5A and 5B may be any material that generates an attractive force by lines of magnetic force d and e with respect to the permanent magnets 7 of the rotors 3A and 3B using, for example, an iron core. Balance magnetic bodies 5A and 5B and rotors 3A and 3B
The magnitudes of the magnetic fluxes d and e between the rotors 3A and 3B are adjusted to the same magnitude as the attractive force by the magnetic flux c of the magnetic coupling of the rotors 3A and 3B, and the distance between the magnetic fluxes d and e and the surfaces of the rotors 3A and 3B. Have been.

In the two-axis synchronous reversing drive motor having the above structure, the armature 2A and the rotor 3A, and the armature 2B and the rotor 3B each constitute a synchronous motor. As shown in FIG. 1, the armature 2A has magnetic pole teeth U, V, W, X, Y, Z
And the armature 2B is also provided with the coil 4 for each of the magnetic pole teeth u, v, w, x, y and z. A three-phase alternating current is supplied to the coil 4 of the armature 2A and the coil 4 of the armature 2B so as to generate a spatially moving magnetic field (rotating magnetic field) in opposite directions, and the rotor 3B, the rotor 3A and the different magnetic pole faces are opposed to each other. Then, the motor is driven so as to rotate synchronously.

At this time, since different magnetic pole surfaces of the rotor 3A and the rotor 3B are attracted to face each other to form a magnetic coupling, the rotors 3A and 3B rotate in opposite directions with stronger synchronization maintained. In addition, the attractive force by the magnetic flux c of the magnetic coupling is canceled by the attractive force by the magnetic fluxes d and e of the balance magnetic bodies 5A and 5B. The rotation speed of the rotor 3A and the rotor 3B can be increased by increasing the frequency of the three-phase AC power supply to increase the rotation speed of the space moving magnetic field, and can rotate at high speed in a synchronous inversion.

As described above, since the two-axis synchronous reversing drive motor having the above structure is non-contact, the noise is low, and the eccentric load applied to the shafts of the rotors 3A and 3B is reduced by the magnetic flux of the balance magnetic members 5A and 5B. The torque is also strong at an average of 360 degrees, so that it is small, stable and can be operated at high speed.

Embodiment 2 FIG. 2 is a view showing the structure of a two-axis synchronous inversion drive motor according to the present invention. In the two-axis synchronous inversion drive motor, the rotor 3
A and the rotor 3B are connected to the outer yoke 6 as shown in FIG.
Parts of A and 6B are cut away. By doing so, the outward magnetic flux leakage from the permanent magnets 7 of the rotors 3A and 3B increases, and the attraction of the magnetic coupling by the magnetic flux c is strengthened.

With the above structure, even if a load is applied to one of the adjacent rotors (the rotor 3A or the rotor 3B), the remaining one rotor is not affected.
The rotors can be rotated synchronously by the attractive force of the magnetic coupling by the two rotors. Other configurations are the same as those of the first embodiment, and the same or corresponding components are denoted by the same reference numerals, and redundant description will be omitted.

Embodiment 3 FIG. 3 is a sectional view showing the structure of a two-axis synchronous inversion drive motor according to the present invention. As shown in the figure, the two-axis synchronous reversing drive motor has a permanent magnet 7 'installed on the outer periphery of the yoke 6A of the rotor 3A and the outer periphery of the yoke 6B of the rotor 3B, similarly to the inner periphery.

With the above structure, the rotor 3A
Attraction force of the magnetic flux c between the rotor and the rotor 3B is increased, and the magnetic coupling is strengthened. Therefore, even when a load torque is applied to one of the adjacent rotors (the rotor 3A or the rotor 3B) in a biased manner, the rotor can be rotated synchronously by the attraction of the magnetic coupling by the remaining one rotor. I can do it. Other configurations are the same as those shown in FIG. 1, and the same or corresponding components are denoted by the same reference numerals, and redundant description will be omitted.

Embodiment 4 FIG. 4 is a sectional view showing the structure of a two-axis synchronous inversion drive motor according to the present invention. In this embodiment, the number of magnetic poles of the permanent magnets 7 of the rotor 3A and the rotor 3B is changed, for example, the rotor 3A has four poles and the rotor 3B has six poles.
The magnetic pole ratio of B is 4: 6.

With the above structure, the rotor 3
The rotation speeds of A and 3B can be synchronously inverted and rotated at a fixed rotation speed ratio of 3: 2. Other configurations are the same as those of the first embodiment, and the same or corresponding components are denoted by the same reference numerals, and redundant description will be omitted.

As described above, the two-axis synchronous reversal drive motor according to the fourth embodiment of the present invention has a rotor 3A and a rotor 3B having a magnetic pole ratio of 2
By setting n to 2 m, a two-axis synchronous reversing motor having an arbitrary rotation speed ratio can be configured.

Embodiment 5 FIG. 5 is a sectional view showing the structure of a multi-axis synchronous reversing drive motor according to the present invention. This multi-axis synchronous inversion drive motor shows a case where the number of axes is three. The rotor 3A, the rotor 3B, and the rotor 3C rotate in synchronization with the adjacent rotor, respectively. The method of energizing the armatures 2A, 2B, and 2C at this time is as described in the first embodiment, and the armatures 2A, 2B, and 2C are arranged such that the spatial moving magnetic fields (rotating magnetic fields) of the adjacent armatures are in opposite directions.
A three-phase alternating current is supplied to the 2C coil 4. Other configurations are the same as those of the first embodiment, and the same or corresponding components are denoted by the same reference numerals, and redundant description will be omitted.

The three-axis synchronous reversing drive motor having the above structure has two
As in the case of the shaft synchronous inversion drive motor, the motor rotates synchronously with the adjacent rotor. Note that the number of axes is not limited to three axes, and the number of axes may be further increased. Further, the multi-axis synchronous inversion drive motor of the present invention can have various modified embodiments without departing from the gist of the present invention.

[0038]

As described in detail above, each of the claims
According to the described invention, the following excellent effects can be obtained.
You.

[0039] According to the invention described in claim 1 of the present application, the electric machine
The armature is placed at the center of the rotor, and the
The dynamic magnetic field causes the rotor to rotate around the armature.
Outer rotor type brushless DC motor
Maintain a predetermined spacing between two or more rotors
With different magnetic pole faces of adjacent rotors facing each other
A magnetic coupling is formed by suction, and the adjacent rotor is
Are rotated in opposite directions, so multiple axes
High-speed and stable synchronous reversal drive enables low noise
And provide a long life multi-axis synchronous reversing drive motor
You.

[0040] According to the invention described in claim 2 of the present application, permanent
Yaw using non-magnetic material around rotor with magnet
The multi-axis synchronous reversing drive motor is located next to the
Synchronous reversal drive with enhanced magnetic coupling between rotors
Can be easily maintained.

[0041] According to the invention described in claim 3 of the present application, permanent
Cut out the yoke provided on the outer circumference of the rotor with the magnet
Rotors adjacent to the multi-axis synchronous reversal drive motor
Magnetic coupling between them is strengthened to facilitate synchronous inversion drive
Can be maintained.

[0042] According to the invention described in claim 4 of the present application, permanent
Permanent magnets on the outer surface of the rotor with magnets
Since a stone is laid, it is next to the multi-axis synchronous reversing drive motor
Synchronous reversal drive with enhanced magnetic coupling between rotors
Can be easily maintained.

[0043] According to the invention described in claim 5 of the present application, two
Creates a suction force in the opposite direction to the magnetic coupling between the rotors.
The pair of magnetic materials to be used is opposite to the opposing surfaces of the two rotors.
Fixedly arranged with a predetermined clearance from the rotor,
To obtain balanced torque that is symmetrical with respect to the
Can be.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a structure of a two-axis synchronous reversing motor according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a structure of a two-axis synchronous reversing motor according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing a structure of a two-axis synchronous reversing motor according to a third embodiment of the present invention.

FIG. 4 is a cross-sectional view illustrating a structure of a two-axis synchronous reversing motor according to a fourth embodiment of the present invention.

FIG. 5 is a sectional view showing a structure of a three-axis synchronous reversing motor according to a fifth embodiment of the present invention.

FIG. 6 is a view showing a structure of a conventional two-axis synchronous reversing motor.
(A) is a side sectional view, and (B) is a front sectional view.

[Explanation of symbols]

 1A Stator core 1B Stator core 1C Stator core 2A Armature 2B Armor 2C Armature 3A Rotor 3B Rotor 3C Rotor 4 Coil 5A Balance magnetic body 5B Balance magnetic body 6A Yoke 6B Yoke 6C Yoke 7 Permanent magnet 7 'Permanent magnet

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Yasushi Kube 11-1 Haneda Asahimachi, Ota-ku, Tokyo Inside Ebara Corporation (56) References JP-A-5-146120 (JP, A) JP Hei 4-156259 (JP, A) JP-A-51-32909 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H02K 16/00 H02K 49/00

Claims (5)

(57) [Claims] 1. An armature for generating a spatially moving magnetic field, and a cylinder.
And a rotor having permanent magnets arranged in a circle.
The armature is placed at the center of the rotor, and the
The rotor is configured to rotate around the armature.
Two or more brushless DC rotor motors
The said two or more outer rotor type brushless DC
Place the motor in parallel with a predetermined spacing between the rotor and the rotor, and different pole face is opposite the suction of each rotor adjacent to a magnetic coupling, the adjacent rotor <br/> multi-axis synchronous inversion driving motor, characterized in that rotate in opposite directions to each other physician. 2. The multi-axis synchronous inversion drive motor according to claim 1, wherein a yoke portion made of a non-magnetic material is provided on an outer periphery of the rotor on which the permanent magnets are arranged. 3. The multi-axis synchronous reversing drive motor according to claim 1, wherein a yoke portion is provided on an outer periphery of the rotor on which the permanent magnet is arranged, and the yoke portion is cut off. 4. The multi-axis synchronous reversing drive motor according to claim 1, wherein a permanent magnet similar to the inner peripheral surface is provided around the outer peripheral surface of the rotor on which the permanent magnets are arranged, and synchronously reversed. 5. A pair of magnetic bodies for exerting a suction force in a direction opposite to a suction force of a magnetic coupling between the two rotors, while maintaining a predetermined gap with the rotors on a side opposite to a facing surface of the two rotors. The multi-axis synchronous inversion drive motor according to claim 1, wherein the motor is fixedly arranged.