JP2022055676A - Magnetic substance area continuous-change type rotor - Google Patents

Abstract

To improve rotation detection accuracy by restricting influence of a leakage magnetic flux of a resolver.SOLUTION: A magnetic substance area continuous-change type rotor includes: a completely round ring body (1); and a magnetic substance (4) formed along a rotating direction (R) of a peripheral surface (3) of the ring body (1) and obtained by changing an area in a sinusoidal shape. A first gap (G1) between the peripheral surface (3) and an inner surface (5a) of a stator (5) is fixed. The magnetic substance (4) is formed by one of spray-coating, adhesion, molding, and plating of magnetic material powder bodies (4a) on the peripheral surface (3). The ring body (1) is formed of one of a non-magnetic material, a magnetic material, a resin material, and a coating material.SELECTED DRAWING: Figure 1

Description

The present invention relates to a rotor having a continuously changing magnetic material area, and in particular, a resolver that forms a magnetic material having a sinusoidal area along the rotation direction of the peripheral surface of a non-magnetic ring body and suppresses leakage flux. Regarding new improvements to obtain rotors.

As a rotor for this type of resolver that has been conventionally used, for example, as shown in Patent Document 1, a change in the gap permeance between the protruding magnetic pole of the stator and the rotor is utilized to change the rotor from 1X to nX. The axis double angle was used.

Japanese Unexamined Patent Publication No. 2020-94987

Since the rotor of the conventional resolver is configured as described above, the following problems exist.
That is, in the conventional rotor, the peripheral surface which is the outer diameter of the rotor changes continuously, and the rotation angle of the rotor is detected by changing the gap permeance between the magnetic flux of the stator and the magnetic flux in a sinusoidal manner. In the region where the gap is wide, it is easily affected by the leakage flux (magnetic flux returning to the stator without passing through the rotor), which is a factor of detection accuracy error.

The present invention has been made to solve the above problems, and in particular, by obtaining a rotor in which a magnetic material having a sinusoidal area changed on the peripheral surface of a perfect circular non-magnetic material is obtained. be.

The magnetic material area continuously changing rotor according to the present invention comprises a perfect circular ring body and a magnetic material formed along the rotation direction of the peripheral surface of the ring body and changing the area in a sinusoidal shape. The gap between the peripheral surface and the inner surface of the stator is constant, and the ring body is made of any one of a non-magnetic material, a magnetic material, a resin material, and a coating material. The magnetic material has a structure in which magnetic material powder is sprayed, adhered, molded, or plated on the peripheral surface, and the magnetic material has a continuous axial width of the peripheral surface. It is a composition that is changing.

Since the magnetic material area continuously changing rotor according to the present invention is configured as described above, the following effects can be obtained.
That is, it is composed of a perfect circular non-magnetic ring body and a magnetic body formed along the rotation direction of the peripheral surface of the non-magnetic ring body and changing the area in a sinusoidal shape. Since the gap between the inner surface and the inner surface is constant, the effect of controlling the leakage flux between the stator and the rotor, which causes an accuracy error of the resolver, is great, and high accuracy of the detection signal can be obtained.
Further, the magnetic material is formed by spraying the magnetic material powder onto the peripheral surface, so that the formation of the magnetic material becomes extremely easy.
Further, the magnetic material has a structure in which the width of the peripheral surface in the axial direction is continuously changed, so that the above-mentioned thermal spraying becomes extremely easy.

It is a perspective view which shows the magnetic material area continuous change type rotor by embodiment of this invention. It is a side view for showing the peripheral surface of FIG. It is a plan view of the case where the resolver is configured by using the rotor of FIG.

In the magnetic body area continuously changing rotor according to the present invention, a magnetic body 4 having a sinusoidal and continuously changing area is provided on the peripheral surface 3 of the ring body 1, and the ring body (rotor) is provided as shown in FIG. The first gap G1 between the peripheral surface 3 of) 1 and the inner surface 5a of the stator 5 is configured to be constant.

Hereinafter, a preferred embodiment of the magnetic material area continuously changing rotor according to the present invention will be described with reference to the drawings.
In FIG. 1, what is indicated by reference numeral 1 is a ring body having a predetermined width W (that is, thickness) along the axial direction P and made of a non-magnetic material, for example, aluminum, resin, or the like, and this ring body. The body 1 constitutes the rotor 2.
The ring body 1 is made of any one of a non-magnetic material, a magnetic material, a resin material, and a coating material (a metal core material whose surface is coated with an insulating material).

As shown in FIG. 2, the peripheral surface 3 of the ring body 1 has a sine and cosine area so that the area is continuously changed from expansion to reduction or reduction to expansion in a width W indicating the thickness thereof. A magnetic body 4 that changes in a wavy shape is formed.
When the magnetic body 4 is rotated along the width W of the peripheral surface 3 of the ring body 1 and along the rotation direction R thereof, as described above, the enlarged portion 4A, the reduced portion 4B, and vice versa are continuous. Is configured to change. Further, as in the resolver 10 shown in FIG. 3, the magnetic body 4 faces the inner surface 5a of the stator 5 and maintains a constant first gap G1 while maintaining the stator windings of the rotor 2 and the stator 5. The second gap G2 between the protruding magnetic pole 5b around which (not shown) is wound is also configured to be kept constant.

As shown in detail in FIG. 2, the magnetic body 4 formed on the peripheral surface 3 of the rotor 2 uses a metal sprayer (not shown) with respect to the peripheral surface 3 of the non-magnetic ring body 1. The area other than the area of the magnetic body 4 shown by the dot pattern in FIG. 2 is masked with heat resistance, and the molten magnetic material powder 4a is rotated along the rotation direction R from the nozzle of the metal sprayer. By spraying while spraying, the magnetic material 4 having a predetermined thickness is formed in a continuous endless shape on the peripheral surface 3. Further, the magnetic material 4 is not limited to the thermal spraying, and can be formed by any one of adhesion, molding and plating. A well-known metal injection machine is used for the molding.

Therefore, as described above, the influence of the leakage flux is reduced by always keeping the second gap G2 between the protruding magnetic pole 5b of the stator 5 and the magnetic body 4 formed on the peripheral surface 3 of the rotor 2 constant. At the same time, the area of the magnetic body 4 can be changed in a sinusoidal shape, and the rotation angle of the rotor 2 can be detected with high accuracy.

In the magnetic material area continuous change type rotor according to the present invention, the magnetic material is formed on the peripheral surface of the rotor made of a non-magnetic material so that the area changes continuously, and the gap between the stator and the rotor is constant, so that leakage occurs. It suppresses magnetic flux and enables highly accurate rotation detection.

1 Non-magnetic ring body 2 Rotor 3 Peripheral surface 4 Magnetic material (magnetic material powder)
4A Enlarged part 4B Reduced part 4a Magnetic powder 5 Stator 5a Inner surface 5b Protruding magnetic pole 10 Resolver G1 1st gap G2 2nd gap P Axial direction R Rotation direction W Width (thickness)

Claims (4)

A perfect circular ring body (1) and a magnetic body (4) formed along the rotation direction (R) of the peripheral surface (3) of the ring body (1) and changing the area in a sinusoidal shape. Consists of
A rotor having a continuous change in magnetic material area, characterized in that the first gap (G1) between the peripheral surface (3) and the inner surface (5a) of the stator (5) is constant. The magnetic material area continuously changing rotor according to claim 1, wherein the ring material (1) is made of any one of a non-magnetic material, a magnetic material, a resin material and a coating material. Claim 1 or 2 is characterized in that the magnetic material (4) is composed of the magnetic material powder (4a) on the peripheral surface (3) by any one of thermal spraying, adhesion, molding and plating. The described magnetic material area continuously changing rotor. Any one of claims 1 to 3, wherein the magnetic material (4) has a configuration in which the width (W) of the peripheral surface (3) in the axial direction (P) is continuously changed. The magnetic material area continuous change type rotor described in the section.

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