阅读说明：本技术 可变磁阻旋转变压器 (Variable reluctance resolver ) 是由 金儇奎 金东润 于 2019-07-05 设计创作，主要内容包括：本发明的实施例涉及一种可变磁阻旋转变压器,包括：定子部,其包括环形的定子芯和从所述定子芯的内周面向轴方向内侧突出的多个齿；转子部,其在所述定子部的内侧隔开布置,并且以中心轴为基准进行旋转；以及端子部,其形成在所述定子部的一侧,所述转子部包括沿外周面向外侧隆起形成的至少一个凸极部,所述至少一个凸极部中的每一个形成为椭圆的弧形状。(An embodiment of the present invention relates to a variable reluctance resolver, including: a stator portion including an annular stator core and a plurality of teeth protruding inward in an axial direction from an inner circumferential surface of the stator core; a rotor portion that is disposed inside the stator portion at a distance and rotates with respect to a central axis; and a terminal portion formed at one side of the stator portion, the rotor portion including at least one salient pole portion formed to bulge outward along an outer circumferential surface, each of the at least one salient pole portion being formed in an arc shape of an ellipse.)

1. A variable reluctance resolver comprising:

a stator portion including an annular stator core and a plurality of teeth protruding inward in an axial direction from an inner circumferential surface of the stator core;

a rotor portion disposed at a distance inside the stator portion and rotating with respect to a central axis; and

a terminal portion formed at one side of the stator portion,

wherein the rotor portion includes at least one salient pole portion formed to bulge outward along an outer circumferential surface,

each of the at least one salient pole portions is formed in an arc shape of an ellipse.

2. The variable reluctance resolver of claim 1, wherein

Each of the at least one salient pole portions is formed in an arc shape that is axisymmetric with respect to a short axis having a larger diameter and the short axis having a smaller diameter in the ellipse including the long axis and the short axis at right angles to each other.

3. The variable reluctance resolver of claim 2, wherein

An extension line from a center position of an outer peripheral surface of each of the at least one salient pole portions to the central axis coincides with the minor axis of the ellipse.

4. The variable reluctance resolver of claim 2, wherein

An outer peripheral surface of each of the at least one salient pole portions is formed in an arc shape in contact with the short shaft.

5. The variable reluctance resolver of claim 1, wherein

In an ellipse including an outer peripheral surface of any one of the at least one salient pole portions, a center of the ellipse is located at a predetermined distance in a radial direction from the center axis.

6. The variable reluctance resolver of claim 1, wherein

An outer peripheral surface of each of the at least one salient pole portions is formed according to the following equation,

Wherein a is half of the length of the major axis of the ellipse and b is half of the length of the minor axis of the ellipse.

7. The variable reluctance resolver of claim 1, wherein

The salient pole portions are formed in at least two, and the at least two salient pole portions are formed in a radial shape with the central axis as a center.

Technical Field

Embodiments of the present invention relate to a variable reluctance resolver.

Background

A Variable reluctance resolver (Variable reluctance resolver) is a position and angle sensor, and when a reference signal of several kilohertz (kHz) is applied to an excitation coil, a signal that changes with the position of a rotor is represented as an output. The output signal may be composed of two outputs having a phase difference of 90 degrees, and either one of the two output coils may represent an output signal of a sin waveform and the other may represent an output signal of a cos waveform. The rotation angle of the rotor can be grasped by the two output signals. In this regard, reference may be made to prior U.S. registered patent No. 7030532.

The variable reluctance resolver as described above has excellent environmental resistance, is useful as an angle sensor in national defense industrial products, special environment products, and the like, and is widely used in industry, vehicles, and the like.

Disclosure of Invention

Technical problem

Embodiments of the present invention are directed to providing a variable reluctance resolver including a Rotor (Rotor) having a novel structure and shape.

Further, an embodiment of the present invention is directed to providing a variable reluctance resolver, wherein a plurality of salient pole portions are formed in a shape of a rotor to move a permeance (permeability) of a magnetic gap according to an elliptic function.

Further, embodiments of the present invention are directed to providing a variable reluctance resolver that may reduce an error range of position and angle measurement and may improve accuracy.

Technical scheme

According to an embodiment of the present invention, there may be provided a variable reluctance resolver including: a stator portion including an annular stator core and a plurality of teeth protruding inward in an axial direction from an inner circumferential surface of the stator core; a rotor portion that is disposed inside the stator portion at a distance and rotates with respect to a central axis; and a terminal portion formed at one side of the stator portion, the rotor portion including at least one salient pole portion formed to bulge outward along an outer circumferential surface, each of the at least one salient pole portion being formed in an arc shape of an ellipse.

Each of the at least one salient pole portions may be formed in an arc shape that is axisymmetric with respect to a short axis having a larger diameter and the short axis having a smaller diameter in the ellipse including the long axis and the short axis at right angles to each other.

An extension line from a center position of an outer circumferential surface of each of the at least one salient pole portions to a central axis of the rotor may coincide with the minor axis of the ellipse.

An outer circumferential surface of each of the at least one salient pole portions may be formed in an arc shape in contact with the short shaft.

In the ellipse including the outer peripheral surface of any one of the at least one salient pole portions, a center of the ellipse may be located at a predetermined distance apart in a radial direction from the center axis.

An outer circumferential surface of each of the at least one salient pole portions may be formed according to the following mathematical formula.

(wherein a is half the length of the major axis of the ellipse and b is half the length of the minor axis of the ellipse).

The salient pole portions are formed in at least two, and the at least two salient pole portions may be radially formed centering on the central axis.

ADVANTAGEOUS EFFECTS OF INVENTION

According to embodiments of the present invention, a Rotor (Rotor) having a novel structure and shape may be included.

Further, according to an embodiment of the present invention, there is provided a variable reluctance resolver characterized in that a plurality of salient pole portions are formed in the shape of a rotor so that the permeability (permeability) of a magnetic gap moves according to an elliptic function.

Further, according to an embodiment of the present invention, there is provided a variable reluctance resolver which can reduce an error range of position and angle measurement and can improve accuracy.

Drawings

Fig. 1 is a diagram illustrating a shape of a conventional variable reluctance resolver.

Fig. 2 is a view illustrating a sectional shape orthogonal to a rotation axis of a variable reluctance resolver according to an embodiment of the present invention.

Fig. 3 is a diagram showing a variable reluctance resolver according to an embodiment of the present invention together with the shape of a rotor portion of an existing variable reluctance resolver.

Fig. 4 (a) is a diagram showing performance experimental data according to a rotor portion shape of the conventional variable reluctance resolver shown in fig. 1, fig. 4 (b) is a diagram showing first performance experimental data according to a rotor portion shape of the variable reluctance resolver according to an embodiment of the present invention, fig. 4 (c) is a diagram showing second performance experimental data according to a rotor portion shape of the variable reluctance resolver according to an embodiment of the present invention, and fig. 4 (d) is a diagram showing third performance experimental data according to a rotor portion shape of the variable reluctance resolver according to an embodiment of the present invention.

Fig. 5 (a) is a diagram showing fourth performance experimental data of a rotor portion shape of a variable reluctance resolver according to an embodiment of the present invention, fig. 5 (b) is a diagram showing fifth performance experimental data of a rotor portion shape of a variable reluctance resolver according to an embodiment of the present invention, fig. 5 (c) is a diagram showing sixth performance experimental data of a rotor portion shape of a variable reluctance resolver according to an embodiment of the present invention, and fig. 5 (d) is a diagram showing seventh performance experimental data of a rotor portion shape of a variable reluctance resolver according to an embodiment of the present invention.

Fig. 6 (a) is a diagram showing eighth performance experimental data of a rotor portion shape of a variable reluctance resolver according to an embodiment of the present invention, fig. 6 (b) is a diagram showing ninth performance experimental data of a rotor portion shape of a variable reluctance resolver according to an embodiment of the present invention, and fig. 6 (c) is a diagram showing tenth performance experimental data of a rotor portion shape of a variable reluctance resolver according to an embodiment of the present invention.

Detailed Description

Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. However, this is merely an example, and the present invention is not limited thereto.

In describing the present invention, when it is judged that detailed description of well-known technology associated with the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of functions in the present invention, and may be different according to intentions or conventions of users and operators, and the like. Therefore, the definition should be made based on the entire contents in the present specification.

The technical idea of the present invention is defined by the claims, and the following embodiment is only one means for effectively explaining the technical idea of the present invention to those skilled in the art to which the present invention pertains.

Fig. 1 is a view illustrating a shape of a conventional variable reluctance resolver, and fig. 2 is a view illustrating a sectional shape orthogonal to a rotation axis of a variable reluctance resolver 10 according to an embodiment of the present invention.

Referring to fig. 1 and 2, a variable reluctance resolver 10 according to an embodiment of the present invention may include a stator portion 100, a rotor portion 200, and a terminal portion 400. At this time, the stator portion 100 may include a stator core 110 and a plurality of teeth 120, the stator core 110 being formed by laminating a plurality of annular sheets, the plurality of teeth 120 protruding from an inner circumferential surface of the stator core 110 to an axial inner side and being wound with the coil portion 500. Further, the rotor portion 200 may be positioned inside the stator portion 100 to be spaced apart from the tips of the plurality of teeth 120 and to be rotatable with reference to the central shaft 210.

Further, the rotor portion 200 may include at least one salient pole portion 220 formed to protrude outward along the outer circumferential surface. At this time, each of the at least one salient pole portions 220 may be formed in an arc shape of an ellipse 221.

In addition, the coil part 500 may include an excitation coil 510 and an output coil 520. At this time, the output coil 520 may be composed of two, and either one of the two output coils 520 may represent an output signal of a sin waveform and the other may represent an output signal of a cos waveform.

The outer circumferential surface of each of the above-mentioned at least one salient pole portions 220 may be an arc including an ellipse 221 having a major axis with a larger diameter and a minor axis with a smaller diameter at right angles to each other. That is, when the outer circumferential surface of each of the at least one salient pole portions 220 is elongated, it may be formed as a virtual ellipse 221 including a major axis and a minor axis.

Further, each of the at least one salient pole portions 220 may be formed in an arc shape that is axisymmetrical with respect to the short axis in the ellipse 221 including the long axis and the short axis. That is, an extension line from the center position of the outer circumferential surface of each of the at least one salient pole portion 220 to the central axis 210 of the rotor portion 200 may coincide with the minor axis of the ellipse 221. Further, the outer circumferential surface of each of the at least one salient pole portions 220 may be formed in an arc shape in contact with the short axis.

At this time, the outer circumferential surface of each of the at least one salient pole portions 220 may be formed according to the following equation 1.

[ mathematical formula 1 ]

(where a is half the length of the major axis of the ellipse 221 and b is half the length of the minor axis of the ellipse 221).

Further, a virtual ellipse 221 including an outer circumferential surface of each of the at least one salient pole portions 220 may be formed according to the above equation 1. That is, each of the above-described salient pole portions 220 may be in the shape of an ellipse 221 formed such that the length of a short axis formed along the direction of the central axis 210 of the rotor portion 200 is shorter than the length of a long axis perpendicular to the direction of the central axis 210 of the rotor portion 200.

In addition, in the case of the variable reluctance resolver 10 according to the embodiment of the present invention, at least two salient pole portions 220 are formed, and the at least two salient pole portions 220 can be formed in a radial shape centering on the central axis 210 of the rotor portion 200. Thereby, the plurality of teeth 120 formed to protrude from the inner circumferential surface of the stator core 110 toward the central axis 210 and the outer circumferential surfaces of the at least two salient pole portions 220 may face each other.

In addition, an example when four salient pole portions 220 are formed is illustrated in fig. 2, but this is exemplary and not limited thereto.

Further, the center 2211 of the virtual ellipse including the outer circumferential surface of each of the at least one salient pole portions 220 may be located at a predetermined distance B in the radial direction from the central axis 210 of the rotor portion 200. That is, when three salient pole portions 220 are formed, the outer circumferential surface of each of the three salient pole portions 220 may be formed in an arc shape of the ellipse 221, and the centers 2211 of the three ellipses including the outer circumferential surfaces of the three salient pole portions 220 may each be located at a predetermined distance B radially spaced from the central axis 210 of the rotor portion 200.

Further, the center 2211 of the virtual ellipse including any one of the outer circumferential surfaces of at least one salient pole portion 220 may be located between the outer circumferential surface of any one salient pole portion 220 and the central axis 210 of the rotor portion 200. That is, the center 2211 of the virtual ellipse including the outer circumferential surface of any one of the salient pole portions 220 may be arranged to be spaced apart by a predetermined distance B from the center axis 210 toward the outer circumferential surface of any one of the salient pole portions 220.

In addition, the variable reluctance resolver 10 according to an embodiment of the present invention may further include a pair of insulators 300 assembled at both sides of the stator core 110 in the axial direction. Further, the terminal part 400 may include a terminal supporting member (not shown) for fixing and supporting a plurality of terminal pins (not shown) to which the end of the excitation coil 510 and the end of the output coil 520 are connected. The terminal holding part may be integrally formed with any one of the pair of insulators 300.

Specifically, the terminal portion 400 may be located on one side in the radial direction of the stator portion 100. Further, the pair of insulators 300 may be formed to wrap at least a part of the outer surface of the plurality of teeth 120 (preferably, a circumferential surface having a protruding direction of each tooth 120 as a central axis), and at least a part of both side surfaces of the stator core 110 in the axial direction may be wrapped by the pair of insulators 300. Thus, the coil part 500 including the excitation coil 510 and the output coil 520 may be wound on the plurality of teeth 120 with the pair of insulators 300 as a medium.

Fig. 3 is a diagram illustrating the shapes of the variable reluctance resolver 10 according to an embodiment of the present invention together with the rotor portion 200 of the conventional variable reluctance resolver, and (a) of fig. 4 is a diagram illustrating performance experimental data according to the shape of the rotor portion of the conventional variable reluctance resolver illustrated in fig. 1. Further, each of (b) to (d) of fig. 4, (a) to (d) of fig. 5, and (a) to (c) of fig. 6 is a graph of first to tenth performance experimental data respectively showing the shape of the rotor portion 200 of the variable reluctance resolver 10 according to the embodiment of the present invention. At this time, a portion illustrated with a dotted line in fig. 3 represents an outer circumferential surface of the salient pole portion 220' of the conventional variable reluctance resolver, and a portion illustrated with a solid line represents an outer circumferential surface of the salient pole portion 220 of the variable reluctance resolver 10 according to the embodiment of the present invention.

At this time, the first to tenth performance test data of the rotor portion 200 shape of the variable reluctance resolver 10 according to the embodiment of the present invention described above are result data of accuracy (or error rate) measured by varying the ratio (a/b) of the major axis length to the minor axis length of the ellipse 221 shape including the outer peripheral surface of the salient pole portion 220 by 0.02 unit, respectively. Further, performance experimental data according to the shape of the rotor portion of the conventional variable reluctance resolver and the results of the first to tenth performance experimental data may be as shown in table 1 below.

[ TABLE 1 ]

Distinguishing	a/b	Precision (arc-min)
			Existing rotor sections	1.00	16.7535
First Performance test	1.02	16.0524
			Second Performance test	1.04	15.8054
Third Performance test	1.06	15.7852
			Fourth Performance test	1.08	15.7741
Fifth Performance test	1.10	15.5057
			Sixth Performance test	1.12	16.5315
Seventh Performance test	1.14	16.9618
			Eighth Performance test	1.16	19.7400
Ninth Performance test	1.18	21.3530
			Tenth performance test	1.20	23.3762

Referring to fig. 3, 4 (a) to (d), 5 (a) to (d), and 6 (a) to (c), when the output accuracy (accuracycacy) of the conventional variable reluctance resolver shown in fig. 1, which includes the outer circumferential surface of the salient pole portion 220' formed in the shape of an arc having a predetermined radius r, is examined, the accuracy (or error rate) is 16.7535 min. In addition, if the output accuracy of the variable reluctance resolver 10 according to the embodiment of the present invention is checked, it can be known that the accuracy of the first to tenth performance experiment data is 16.0524min, 15.8054min, 15.7852min, 15.7741min, 15.5057min, 16.5315min, 16.9618min, 19.7400min, 21.3530min, and 23.3762min, respectively.

As described above, in the rotor portion 200 of the variable reluctance resolver 10 according to the embodiment of the present invention, when the ratio (a/b) of the length of the major axis to the length of the minor axis of the ellipse 221 shape including the outer peripheral surface of the salient pole portion 220 is 1.04 to 1.10, the accuracy is set to 16min or less, which is improved by 0.7min or more compared to the variable reluctance resolver according to the rotor portion shape including the conventional circular arc shaped salient pole portion, and thus it is understood that the accuracy is greatly improved for the variable reluctance resolver in which the accuracy of measuring the rotation angle is important.

Further, the angle 1 ° may be expressed as 60min (1 ° -60 min), and the accuracy (or error rate) of the conventional variable reluctance resolver is formed to be 0.279 °, however, it is known that, in the case of the variable reluctance resolver 10 according to the embodiment of the present invention, the ratio (a/b) of the length of the major axis to the length of the minor axis of the ellipse 221 shape including the outer circumferential surface of the salient pole portion 220 is formed to be 1.04 or more and 1.10 or less, and thus the accuracy (or error rate) is greatly improved to be 0.267 ° or less. Further, it is found that when the ratio of the length of the major axis to the length of the minor axis of the ellipse 221 including the outer peripheral surface of the salient pole portion 220 is 1.04 or more and 1.10 or less, the accuracy is greatly improved as compared with the case where the ratio (a/b) of the length of the major axis to the length of the minor axis is 1.10 or more.

As can be seen from the above experimental results, in the case of the variable reluctance resolver 10 including the rotor portion 200 formed with the elliptical salient pole portion 220 according to the embodiment of the present invention, it is possible to secure improved measurement accuracy as compared to a variable reluctance resolver including a rotor portion formed with the existing circular-arc salient pole portion 220'.

In addition, the above experimental data is a value measured by changing only the shape of the salient pole portion 220 of the rotor portion 200 and the ratio (a/b) of the length of the major axis to the length of the minor axis of the ellipse 221 in the variable reluctance resolver 10 according to the embodiment of the present invention shown in fig. 2. That is, the other conditions, such as the number of salient pole portions 220, the number of teeth 120, the number of turns of the coil portion 500 per tooth 120, and the inner and outer diameters of each of the rotor portion 200 and the stator portion 100, are performed under the same conditions.

In addition, the above performance test data was performed by electromagnetic analysis of the JMAG program. In this case, the accuracy (or error rate) may be defined as the magnitude of the difference between the maximum value and the minimum value of the analyzed output rotation angle profile when the analyzed output rotation angle profile is compared with the ideal rotation angle profile (0 on the y-axis in the performance test data) by analyzing the output waveform of the variable reluctance resolver under each condition in which only the condition for the shape of the salient pole portion 220 is changed, and then calculating the analyzed output rotation angle profile.

It should be understood that although the present invention has been described in detail through the above representative embodiments, it should be understood that various modifications may be made to the above embodiments by those of ordinary skill in the art to which the present invention pertains without departing from the scope of the present invention. Therefore, the scope of the claims of the present invention should not be limited to the described embodiments, but should be defined by the scope of the appended claims and equivalents thereof.