JP5259492B2 - Magnetic power transmission means - Google Patents

Description

  The present invention relates to a magnetic power transmission device that transmits rotation in a non-contact manner by a magnetic force between a drive shaft and a driven shaft.

  Conventionally, as a power transmission device, one having a magnetic power transmission means capable of reducing wear, dust generation, contact noise, etc. is known, and a magnetic cylinder in which magnetic poles N poles and S poles are alternately arranged on a cylindrical surface. And the magnetic disk in which the magnetic poles N and S are alternately arranged in a radial curve from the inner periphery to the outer periphery on the disk surface, and the rotation axes of the magnetic cylinder and the magnetic disk are orthogonal on the same plane. Magnetic power transmission means arranged in such a manner are known.

  A known magnetic disk 510 of a magnetic power transmission means transmits torque with a radial line closest to an opposing magnetic cylinder. For example, as shown in FIG. The spiral curve 511 is defined so that at least one N pole and one S pole are always present on the radial line, and the N pole and the S pole are alternately arranged in a radial curve.

That is, when torque is transmitted by rotating the magnetic cylinder and the magnetic disk, at least one N pole and S pole always exist on the closest line.
The spiral curve 511 is determined so as to rotate smoothly and increase the transmission torque by defining the relationship between the arrangement of the N pole and the S pole of the magnetic cylinder (see, for example, Patent Document 1). ).

Japanese Patent No. 4072186 (5th and 6th pages, FIG. 6)

  However, in the arrangement of the north and south poles of the magnetic disk 510 of the known magnetic power transmission means, as shown in FIG. 8, the total length of the north and south poles on the radial line varies with rotation. Therefore, there is a problem that balance fluctuation of repulsive force / attraction force generated between the magnetic cylinder and the magnetic disk is likely to occur, ripple of transmission torque and fluctuation of rotational speed occur, causing vibration and noise. .

  The present invention solves the problems of the prior art as described above, that is, the object of the present invention is to reduce balance fluctuation of repulsive force / attraction force, and to reduce ripple of transmission torque and fluctuation of rotational speed. In addition, a magnetic power transmission means for preventing vibration and noise is provided.

According to the first aspect of the present invention, a magnetic cylinder in which magnetic poles N poles and S poles are alternately arranged on the cylinder surface, and magnetic poles N poles and S poles alternately in the disk surface from the inner periphery toward the outer periphery. In the magnetic power transmission means, the magnetic disk arranged in a radial curve is opposed to each other, and the rotation axis of the magnetic cylinder and the rotation axis of the magnetic disk are arranged so as to be orthogonal to each other on the same plane. The arrangement of the magnetic disk magnetic poles is such that the total length of the N poles on the radial line passing through the center of the magnetic disk and the total length of the S poles are the same over the entire circumferential range, and the N poles on the radial line The total length of the S poles and the total length of the S poles are the same, and the N poles and the S poles are alternately arranged with a plurality of Archimedes curves as boundaries, and the Archimedes curves are provided at equal intervals. In addition, the following formula r = aθ + ri
a = (ro-ri) / (C · Qq)
(Ri: radius of the innermost circumference of the magnetic pole ro: radius of the outermost circumference of the magnetic pole C: number of poles of the magnetic pole appearing on the radius at the position of the origin (θ = 0) Qq: angle per pole in the circumferential direction)
By solving this problem, the above-mentioned problem is solved.

  According to the second aspect of the present invention, the magnetic arrangement of the magnetic cylinder is the same over the entire circumferential range of the total length of the N poles and the total length of the S poles on the rotation axis direction line of the magnetic cylinders. In addition, the above-described problem is further solved by arranging the total length of the N poles on the line in the rotation axis direction and the total length of the S poles to be the same.

  The magnetic power transmission means of the present invention comprises a magnetic cylinder having magnetic poles N and S poles alternately arranged on the cylinder surface, and alternating magnetic poles N and S poles from the inner circumference to the outer circumference on the disk surface. Are arranged so that the rotation axis of the magnetic cylinder and the rotation axis of the magnetic disk are orthogonal to each other on the same plane.

According to the magnetic power transmission means of the first aspect of the present invention, the arrangement of the magnetic poles of the magnetic disk is such that the total length of the N poles and the total length of the S poles on a radial straight line passing through the center of the magnetic disk. Are the same over the entire circumferential range, the total length of the N poles on the radial line is the same as the total length of the S poles, and the N poles and the S poles are alternately arranged with a plurality of Archimedes curves as boundaries. Archimedes curves are provided at equal intervals, and the following equation is given: r = aθ + ri
a = (ro-ri) / (C · Qq)
(Ri: radius of the innermost circumference of the magnetic pole ro: radius of the outermost circumference of the magnetic pole C: number of poles of the magnetic pole appearing on the radius at the position of the origin (θ = 0) Qq: angle per pole in the circumferential direction)
By reducing the repulsive force / attractive force balance fluctuation generated between the magnetic cylinder and the magnetic disk, it is possible to reduce the ripple of the transmission torque and the rotational speed fluctuation, and to reduce vibration and noise. Can be prevented.

  Furthermore, since the moving speed in the radial direction of the magnetic disk boundary line accompanying the rotation of the closest point of the magnetic disk and magnetic cylinder is proportional to the rotating speed, it is further generated between the magnetic cylinder and the magnetic disk. The balance fluctuation of repulsive force / attraction force can be reduced, the ripple of transmission torque and the rotation speed fluctuation can be reduced, and vibration and noise can be prevented.

  In addition, all the magnetic poles have the same shape and the structure is simplified. Furthermore, the balance fluctuation of the repulsive force / attraction force generated between the magnetic cylinder and the magnetic disk is reduced, and the ripple of transmission torque and the fluctuation of rotational speed are reduced. In addition, vibration and noise can be prevented.

  According to the magnetic power transmission means of the first aspect of the present invention, the magnetic arrangement of the magnetic cylinder is calculated by adding the total length of the N poles and the total length of the S poles on a line in the rotation axis direction of the magnetic cylinder. The arrangement is the same over the entire circumferential range, and the arrangement is made such that the total length of the N poles and the total length of the S poles on the line in the rotation axis direction are the same. The balance fluctuation of the repulsive force / attraction force generated between them can be reduced, the ripple of the transmission torque and the fluctuation of the rotational speed can be reduced, and vibration and noise can be prevented.

The perspective view of the magnetic type power transmission means which is one Example of this invention. The front view of the magnetic pole part of FIG. Explanatory drawing of the magnetic pole arrangement | positioning of the magnetic disc of FIG. Explanatory drawing of magnetic pole arrangement | positioning of the magnetic cylinder of FIG. Explanatory drawing of the length of the magnetic pole on the radial line of the magnetic disc of FIG. Explanatory drawing of the speed fluctuation | variation of one Example and conventional example of this invention. Explanatory drawing of the magnetic pole arrangement | positioning of the magnetic disc of the conventional magnetic type power transmission means. Explanatory drawing of the length of the magnetic pole on the radial line of the magnetic disc of the conventional magnetic type power transmission means.

In the present invention, a magnetic cylinder in which magnetic poles N poles and S poles are alternately arranged on the cylinder surface, and magnetic poles N poles and S poles are alternately arranged in a radial curve shape from the inner periphery to the outer periphery on the disk surface. In the magnetic power transmission means in which the rotation axis of the magnetic cylinder and the rotation axis of the magnetic disk are arranged so as to be orthogonal to each other on the same plane, the arrangement of the magnetic poles of the magnetic disk is The total length of the N poles on the radial line passing through the center of the magnetic disk and the total length of the S poles are the same over the entire circumferential range, and the total length of the N poles on the radial line and the S poles The total length is the same, and the N poles and S poles are alternately arranged with a plurality of Archimedes curves as boundaries. The Archimedes curves are provided at equal intervals, and the following equation: r = aθ + ri
a = (ro-ri) / (C · Qq)
(Ri: radius of the innermost circumference of the magnetic pole ro: radius of the outermost circumference of the magnetic pole C: number of poles of the magnetic pole appearing on the radius at the position of the origin (θ = 0) Qq: angle per pole in the circumferential direction)
By reducing the balance fluctuation of repulsive force / attraction force generated between the magnetic cylinder and the magnetic disk, the ripple of the transmission torque and the rotational speed fluctuation are reduced, and vibration and noise are prevented. So long as the specific embodiment thereof is arbitrary.

That is, the magnetic power transmission means used in the present invention is provided with a magnetic cylinder or a magnetic disk on either the driving side or the driven side as long as power transmission is performed between rotating shafts orthogonal to each other on the same plane. May be.
Further, the magnetic disk and the magnetic cylinder may have any number of magnetic poles as long as they are alternately provided in the rotation direction.

Hereinafter, magnetic power transmission means according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the magnetic power transmission means 100 according to an embodiment of the present invention includes a magnetic cylinder 120 in which N poles and S poles of a magnetic pole 122 are alternately arranged on the surface of a cylinder 123, and the surface of a disk 113. A magnetic disk 110 in which N poles and S poles of the magnetic pole 112 are alternately arranged in a radial curve shape from the inner circumference to the outer circumference is attached to the rotating shafts 114 and 124 on the same plane and whose axis centers are orthogonal to each other. The surfaces of the magnetic poles 112 and 122 are arranged so as to face each other at a slight interval.

  As shown in FIG. 2, the magnetic disk 110 has magnetic poles 112 alternately arranged with N poles and S poles on the surface on the magnetic disk 110 side, with a spiral curve 111 as a boundary from the inner periphery to the outer periphery. The magnetic cylinder 120 is configured such that the magnetic poles 122 are alternately arranged on the cylindrical surface with the N and S poles on the boundary of the spiral curves 121 at equal intervals in the circumferential direction.

  In this embodiment, the number of spiral curves 111 and magnetic poles 112 of the magnetic disk 110 and the number of spiral curves 121 and magnetic poles 122 of the magnetic cylinder 120 are each 8. However, any number may be used as long as each is an even number. The number of spiral curves 121 and magnetic poles 122 of the magnetic cylinder 120 may be the same as or different from the number of spiral curves 111 and magnetic poles 112 of the magnetic disk 110 depending on the radius of the magnetic cylinder 120.

In addition, the length in the axial direction of the magnetic pole 122 of the magnetic cylinder 120 and the length in the radial direction from the inner circumference to the outer circumference where the magnetic pole 112 of the magnetic disk 110 is disposed are configured to be equal. The length of the magnetic pole 122 in the axial direction may be longer.
Further, in this embodiment, the magnetic pole 112 of the magnetic disk 110 is arranged with a gap in the boundary of the spiral curve 111, and the magnetic pole 122 of the magnetic cylinder 120 is arranged without a gap in the boundary of the spiral curve 121. However, both the magnetic disk 110 and the magnetic cylinder 120 may have any gap.

The eight spiral curves 111 of the magnetic disk 110 are respectively expressed by the following equations:
r = aθ + ri
a = (ro-ri) / (C · Qq)
(Ri: radius of the innermost circumference of the magnetic pole 112 ro: radius of the outermost circumference of the magnetic pole 112 C: appears on the radius of the magnetic disk 110 at the position of the origin (θ = 0: the point where the spiral curve 111 is in contact with the inner circumference) Number of poles of magnetic pole 112 Qq: angle per pole in the circumferential direction = 360 ° / number of spiral curves 111)
3, and a plurality of identical Archimedes curves are provided at equal angular intervals in the circumferential direction. As shown in FIG. 3, a radial straight line (a˜) passing through the center of the magnetic disk 110 is obtained. f), the total length of the N poles and the total length of the S poles are the same over the entire circumference.

In this example,
C = 2
Qq = 45 °
Therefore, each spiral curve 111 is
r = (ro−ri) · θ / 90 ° + ri
It becomes a curve represented by.

  As shown in FIG. 4, the magnetic cylinder 120 has a length in the radial direction (ro-ri) from the inner circumference to the outer circumference where the magnetic pole 112 of the magnetic disk 110 is arranged, as shown in FIG. A spiral curve 121 serving as a boundary between magnetic poles 122 in which poles are alternately arranged is configured so that the total length of the N poles in the axial direction and the total length of the S poles are the same over the entire circumference.

  With the above configuration, as shown in FIG. 5, the total length of each of the N pole and the S pole on the radial line of the magnetic disk 110 where torque is transmitted closest to the magnetic cylinder 120 varies with rotation. The balance between the repulsive force and the attractive force generated between the magnetic cylinder 120 and the magnetic disk 110 is less likely to occur, the transmission torque ripple and rotational speed fluctuation are reduced, and vibration and noise can be prevented. it can.

  FIG. 6 (a) is a graph in which the rotational speed of the magnetic power transmission means of the present invention is measured, and FIG. 6 (b) is a graph obtained by measuring the number of revolutions of the conventional magnetic power transmission means. Compared to the magnetic power transmission means, the speed of change of the rotational speed (the slope of the rotational speed curve) is also small, so that the ripple of the transmission torque is reduced. It is respectively shown that the rotational speed fluctuation is reduced because the difference is small.

In the magnetic power transmission means 100 of the present invention thus obtained, the arrangement of the magnetic poles 112 of the magnetic disk 110 is such that the length of the N pole on a radial straight line (a to f etc.) passing through the center of the magnetic disk 110. And the sum of the lengths of the S poles are the same over the entire circumferential range, and the sum of the lengths of the N poles and the sum of the lengths of the S poles on the radial straight line (af) are the same. The N poles and S poles are alternately arranged with a plurality of Archimedes curves (111) as boundaries, and the Archimedes curves (111) are provided at equal intervals, and the following equation: r = aθ + ri
a = (ro-ri) / (C · Qq)
(Ri: radius of the innermost circumference of the magnetic pole ro: radius of the outermost circumference of the magnetic pole C: number of poles of the magnetic pole appearing on the radius at the position of the origin (θ = 0) Qq: angle per pole in the circumferential direction)
By reducing the repulsive force / attractive force balance fluctuation generated between the magnetic cylinder 120 and the magnetic disk 110, the transmission torque ripple and rotational speed fluctuation are reduced, and vibration and noise are prevented. it can.

DESCRIPTION OF SYMBOLS 100 ... Magnetic power transmission means 110, 510 ... Magnetic disks 111, 511 ... Spiral curves 112, 512 ... Magnetic poles 113, 513 ... Rotating shafts 120, 520 ... Magnetic cylinder 121, 521 ... Spiral curve 122, 522 ... Magnetic pole 123, 523 ... Rotation axis

Claims (2)

A magnetic cylinder in which N poles and S poles of magnetic poles are alternately arranged on a cylindrical surface, and a magnetic disk in which N poles and S poles of magnetic poles are alternately arranged in a radial curve from the inner periphery to the outer periphery on the disk surface; In the magnetic power transmission means in which the rotation axis of the magnetic cylinder and the rotation axis of the magnetic disk are arranged so as to be orthogonal to each other on the same plane,
The arrangement of the magnetic poles of the magnetic disk is such that the total length of N poles and the total length of S poles on the radial line passing through the center of the magnetic disk are the same over the entire circumferential range, and N on the radial line. The total length of the poles and the total length of the S poles are the same, and the N poles and the S poles are alternately arranged with a plurality of Archimedes curves as boundaries,
The Archimedes curve is provided at equal intervals and is expressed by the following equation.
r = aθ + ri
a = (ro-ri) / (C · Qq)
(Ri: radius of the innermost circumference of the magnetic pole ro: radius of the outermost circumference of the magnetic pole C: number of poles of the magnetic pole appearing on the radius at the position of the origin (θ = 0) Qq: angle per pole in the circumferential direction) The magnetic arrangement of the magnetic cylinder is such that the total length of the N poles and the total length of the S poles on the rotation axis direction line of the magnetic cylinders are the same over the entire circumferential range, and on the rotation axis direction line. 2. The magnetic power transmission unit according to claim 1, wherein the total length of the N poles and the total length of the S poles are the same.

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