JP5281601B2 - Reluctance type resolver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high precision reluctance type resolver having good offset characteristics and hardly receiving the effect of an external magnetic flux. <P>SOLUTION: In teeth of a stator 3 comprising a magnetic material including a plurality of teeth 4 to 19, adjacent two teeth are used as a tooth pair, and the pairs are arranged equidistantly to be used as a tooth pair set. A first detection winding 21 and a second detection winding 22 are arranged at first tooth pair set 110 and a second tooth pair set 210 having a phase angle shifted by 90 degrees, respectively. A third tooth pair 301 is arranged between the first tooth pair 101 and the second tooth pair 201. In the first detection winding 21 and the second detection winding 22, the detection windings are wound around the respective teeth in the opposite directions. The winding directions of the excitation winding 20 wound around the third tooth pair set are alternately reversed. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a reluctance resolver, and more particularly to a resolver structure that is not easily affected by magnetic flux leakage from a rotor or electromagnetic brake generated in an electric motor or affected by changes in magnetic flux from the outside of the electric motor and that has good offset characteristics.

  Conventionally, as a reluctance type resolver, as disclosed in Patent Document 1, a resolver that is not easily affected by magnetic flux from an electric motor rotor or electromagnetic brake has been proposed. In particular, the resolver shown in FIG. 2 of Patent Document 1 has an action of canceling an electromotive voltage generated in a winding with respect to an external magnetic flux, and includes not only a magnetic flux from an electric motor rotor and an electromagnetic brake but also a magnetic flux mixed from outside the electric motor There was the feature that it was hard to be influenced by change.

JP 2002-027719 A

  The resolver of Patent Document 1 has a feature that it is hardly affected by external magnetic flux. However, since the position is detected by the permeance change of the excitation winding, the permeance component due to the leakage flux of the excitation magnetic flux tends to be larger than the permeance change that changes due to the movement of the rotor (mover). For this reason, when the leakage flux of the excitation magnetic flux changes due to a temperature change or the like, there is a problem that the offset component included in the resolver output signal is likely to change and it is difficult to detect the position with high accuracy.

  The present invention is advantageous in that it can provide a highly accurate resolver that is not easily affected by external magnetic flux and has good offset characteristics.

  A reluctance type resolver of the present invention includes a stator made of a magnetic material having a plurality of teeth, a mover made of a magnetic material having irregularities on the side facing the teeth of the stator, and a first tooth including two adjacent teeth. A first detection winding wound around each tooth of a first tooth set in which a plurality of tooth sets are arranged at equal intervals, and a second tooth set including two adjacent teeth is provided for each of the first teeth. A second detection winding wound around each tooth of a second set of teeth arranged at equal intervals with a predetermined phase angle shifted from the set of teeth, and the first set of teeth and the second set of teeth An excitation winding wound around a third tooth set in which a plurality of third tooth sets including at least one tooth are arranged at regular intervals, and according to the movement of the mover, A reluctance resolver for detecting a voltage change between the first detection winding and the second detection winding to obtain a movable position of the mover. The first detection winding is wound around the two teeth of the first tooth set so as to generate electromotive voltages in opposite directions with respect to the change in magnetic flux in the same direction. The second detection winding is wound around the two teeth of the tooth set so that electromotive voltages opposite to each other are generated with respect to a change in magnetic flux in the same direction, and the third tooth set is alternately reversed. The excitation winding is wound so as to generate a magnetic flux in a direction.

  In the reluctance type resolver according to the present invention, the first tooth set of the first tooth set may be arranged so that the phase angle is shifted from each tooth of the first tooth set by twice the predetermined phase angle. The first detection winding is wound around each tooth of the other first tooth set of the tooth set so as to generate electromotive voltages in opposite directions with respect to magnetic flux changes in the same direction. The other second teeth of the second set of teeth that are arranged with a phase angle shifted from the respective teeth of the second set of teeth of the second set of teeth by twice the predetermined phase angle. It is also preferable that the second detection winding is wound around each tooth of the set so that an electromotive force in the opposite direction is generated with respect to a change in magnetic flux in the same direction.

  In the reluctance resolver of the present invention, the third tooth set includes a plurality of adjacent teeth, and the excitation winding is wound around each tooth so that a magnetic flux is generated in the same direction. It is also preferable that the third tooth set includes a plurality of adjacent teeth, and the exciting winding is wound by bundling the teeth.

  The present invention has been made under the circumstances described above, and an object of the present invention is to provide a highly accurate resolver that is not easily affected by external magnetic flux and has good offset characteristics.

Sectional view in radial direction of the reluctance resolver of the invention Radial sectional view of another reluctance resolver of the invention Radial sectional view of another reluctance resolver of the invention

  Hereinafter, a reluctance resolver 100 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a cross section in the radial direction of a reluctance resolver 100 of the present invention. As shown in FIG. 1, a rotor (movable element) 2 having a single convex portion and a single concave portion and made of a magnetic material such as a silicon steel plate is fixed to the rotary shaft 1. The stator 3 is made of a magnetic material such as a silicon steel plate, and has 16 teeth 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19. Further, in the stator 3, the teeth 4, 5, 6, 7 and the teeth 8, 9, 10, 11, the teeth 12, 13, 14, 15 and the teeth 16 are grouped into four consecutive teeth. , 17, 18 and 19 are arranged so as to be shifted by a phase angle L of 90 degrees, and the teeth in the same group are arranged at an equal pitch with an interval of about 19 degrees. One excitation winding 20, one first detection winding 21, and one second detection winding 22 are wound around the 16 teeth arranged in this way.

  One excitation winding 20 indicated by a dotted line in FIG. 1 enters between the teeth 16 and 17 from one terminal 61 along the teeth 16 from the upper side to the lower side of the page. Is wound counterclockwise (indicated by symbol A in FIG. 1) from the rotary shaft 1 to the stator 3, is wound from the tooth 16 to the tooth 15, and is wound around the tooth 15 in the counterclockwise direction. The exciting winding 20 is wound clockwise around the tooth 19 from the tooth 15 to the tooth 19 (indicated by the symbol C in FIG. 1), crosses from the tooth 19 to the tooth 4, and around the tooth 4. Wound around. The excitation winding 20 is wound from the tooth 4 to the tooth 8, wound around the tooth 8 counterclockwise, and wound from the tooth 8 to the tooth 7 around the tooth 7 in the counterclockwise direction. The excitation winding 20 is wound clockwise around the tooth 11 from the tooth 7 to the tooth 11, wound around the tooth 12 from the tooth 11, and wound clockwise around the tooth 12. Between the teeth 13 and the teeth 13, which protrudes from the lower side to the upper side in the drawing, and is connected to the other terminal 62.

  One first detection winding 21 shown by a solid line in FIG. 1 enters between the teeth 12 and 13 from one terminal 63 along the teeth 13 from the upper side to the lower side of the drawing. 1 is wound clockwise (indicated by symbol C in FIG. 1) from the rotary shaft 1 toward the stator 3, crosses from tooth 13 to tooth 14, and counterclockwise around tooth 14 (in FIG. 1). It is wound around (indicated by symbol A). The first detection winding 21 is wound counterclockwise around the tooth 5 from the tooth 14 to the tooth 5, and wound clockwise around the tooth 6 from the tooth 5 to the tooth 6. The The first detection winding 21 is connected between the tooth 6 and the tooth 7 from the lower direction to the upper direction on the paper surface and connected to the other terminal 64.

  One second detection winding 22 indicated by a one-dot chain line in FIG. 1 enters between the tooth 9 and the tooth 10 from one terminal 65 along the tooth 9 from the upper side to the lower side of the paper surface, 1 is wound clockwise around the tooth 9 from the rotary shaft 1 toward the stator 3 (indicated by symbol C in FIG. 1), crosses from the tooth 9 to the tooth 10, and counterclockwise around the tooth 10 (FIG. 1). (Indicated by symbol A). The second detection winding 22 is wound counterclockwise around the tooth 17 from the tooth 10 to the tooth 17, wound clockwise around the tooth 18 from the tooth 17 to the tooth 18. The The second detection winding 22 is connected between the tooth 18 and the tooth 19 from the lower direction to the upper direction on the paper surface and is connected to the other terminal 66.

  Further, in the teeth 5 and 13 and the teeth 6 and 14 separated by 180 degrees, which is twice the phase angle L (2 · L), an electromotive voltage is generated in the opposite direction with respect to the change in magnetic flux in the same direction. Thus, the first detection windings 21 are wound in opposite directions. In addition, teeth 9 and teeth 17 or teeth 10 and teeth 18 separated by 180 degrees, which is twice the phase angle L (2.L), also generate an electromotive force in the opposite direction with respect to the change in magnetic flux in the same direction. The second detection windings 22 are wound in opposite directions.

  As described above, in the present embodiment, the first detection winding 21 includes the first tooth set 101 including the two adjacent teeth 5 and 6 and the first tooth set 102 including the two teeth 13 and 14. Are wound around the teeth 5, 6, 13, and 14 of the first set of teeth 110 that are arranged at equal intervals with a shift of 180 degrees that is twice the phase angle L (2 · L). The detection winding 22 includes a second tooth set 201 including two adjacent teeth 9 and 10 and a second tooth set 202 including two teeth 17 and 18 that are twice the phase angle L (2 · L ) Are wound around the teeth 9, 10, 17, and 18 of the second set of teeth 210 that are arranged at equal intervals by being shifted by 180 degrees, and the first set of teeth 101 and 102 and the second set of teeth They are arranged at equal intervals from each other by a phase angle L (90 degrees). A third tooth set 301 including two teeth 7 and 8 and a third tooth set 302 including teeth 11 and 12 between the first tooth set 101 and 102 and the second tooth set 201 and 202 are provided. The third tooth set 303 including the teeth 15 and the teeth 16 and the third tooth set 304 including the teeth 19 and the teeth 4 are arranged at equal intervals. A first detection winding is wound around the two teeth 5 and 6 and the teeth 13 and 14 of the first tooth set 101 and 102 in opposite directions, and the two teeth of the second tooth set 201 and 202 are provided. The second detection winding is wound around the teeth 9 and 10 and the teeth 17 and 18 in opposite directions, and the winding directions are alternately opposite to the third tooth sets 301, 302, 303, and 304. An exciting winding 20 is wound around.

  Thus, the exciting winding 20 is wound counterclockwise around the teeth 7, 8, 15 and 16, and the exciting winding 20 is wound clockwise around the teeth 11, 12, 19, and 4. . For this reason, when an electric current is passed through the excitation winding 20, the teeth 4 and 7, the teeth 8 and 11, the teeth 12 and 15, and the teeth 16 and 19 are wound in opposite directions. Generates magnetic fluxes in opposite directions with respect to the direction toward the center of the rotating shaft 1. In addition, the adjacent teeth 4 and 19, teeth 7 and 8, teeth 11 and 12, teeth 15 and 16 that have the excitation winding 20 wound in the same direction are located at the center of the rotary shaft 1. A magnetic flux in the same direction is generated with respect to the direction of travel. Then, the tooth 5 around which the first detection winding 21 adjacent to the tooth 4 is wound by the generated magnetic flux and the tooth 6 around which the first detection winding 21 adjacent to the tooth 7 is wound. Produces magnetic fluxes in opposite directions with respect to the direction toward the center of the rotating shaft 1. Similarly, the teeth 13 and 14 around which the first detection winding 21 is wound, the teeth 9 and 10 around which the second detection winding 22 is wound, and the teeth 17 and 18 are also rotated. Magnetic fluxes in opposite directions with respect to the direction toward the center of 1 are generated.

  Since the first detection winding 21 is wound counterclockwise and the tooth 5 is wound clockwise, an electromotive force is generated in the opposite direction with respect to the change in magnetic flux in the same direction. When the direction of the magnetic flux generated by the excitation winding 20 is opposite between the teeth 5 and 6 as described above, the first detection winding 21 wound around the teeth 5 and 6 includes An electromotive force in the same direction is generated. On the other hand, since the teeth 5 and 6 around which the first detection winding 21 is wound are subjected to almost equal magnetic flux changes by the external magnetic flux, the electromotive forces generated by the external magnetic flux are reversed and cancel each other. . Similarly, an electromotive voltage in the opposite direction is generated for a change in magnetic flux in the same direction on the tooth 9 on which the second detection winding 22 is wound clockwise and the tooth 10 on which the second detection winding 22 is wound counterclockwise. Therefore, when the direction of the magnetic flux generated by the excitation winding 20 is opposite in the teeth 9 and 10 as described above, an electromotive force in the same direction is generated. On the other hand, since the teeth 9 and 10 around which the second detection winding 22 is wound are subjected to almost the same magnetic flux change by the external magnetic flux, the electromotive forces generated by the external magnetic flux are reversed and cancel each other. It will be.

With such a configuration, when an alternating voltage of Ei = E · SIN (ωt) is applied to the excitation winding 20, the change in reluctance between the uneven shape of the rotor 2 and the teeth of the stator 3 is caused by the broken line in FIG. Magnetic flux is generated in the direction indicated by the arrow, and electromotive voltages Eoc1 and Eos1 as shown in Equations 1 and 2 are applied to the first and second detection windings 21 and 22 depending on the rotational position θ1 of the rotary shaft 1. Occur.
Eoc1 = Eo · COS (θ1) SIN (ωt) ---- (Equation 1)
Eos1 = Eo · SIN (θ1) SIN (ωt) ---- (Expression 2)
In Expressions 1 and 2, if the electromotive voltages Eoc1 and Eos1 are sampled at the timing of SIN (ωt) = 1 and the arctangent calculation is performed, the rotation angle θ1 of the rotating shaft 1 can be detected. In the reluctance resolver 100 as shown in FIG. 1, most of the magnetic flux generated by the excitation winding 20 is each tooth 5, 6 on which the first and second detection windings 21, 22 are wound via the rotor 2. 9, 9, 13, 14, 17, 18, the offset component included in the electromotive voltages generated in the first and second detection windings 21, 22 is very small. Further, adjacent teeth 5 constituting the first tooth set 101, 102 and the second tooth set 201, 202 around which the first and second detection windings 21, 22 are wound with respect to the external magnetic flux. 6, teeth 13 and 14, teeth 9 and 10, and teeth 17 and 18 are subjected to substantially equal magnetic flux changes, so that the electromotive voltage due to the external magnetic flux generated by the first and second detection windings 21 and 22 is canceled out. , Hardly affected by external magnetic flux. However, in the reluctance resolver 100 of FIG. 1, the reluctance with the rotor 2 is slightly different between the tooth 17 and the tooth 18 or between the tooth 9 and the tooth 10. For this reason, the magnetic flux generated by the external magnetic flux is slightly different and may be affected by the external magnetic flux to some extent.

  As described above, according to the reluctance resolver 100 of this embodiment, the excitation winding 20 and the first and second detection windings 21 and 22 are wound around different teeth, and therefore, generated due to the leakage flux of the excitation magnetic flux. Thus, the electromotive voltage of the first and second detection windings 21 and 22 can be made very small. For this reason, the fluctuation | variation by the temperature change etc. of the offset component contained in an output signal is small, and a highly accurate position detection is possible. Further, when an external magnetic flux enters the reluctance resolver 100, an electromotive voltage due to a change in the external magnetic flux generated in two adjacent teeth around which the first and second detection windings 21 and 22 are wound is canceled out. Since the first and second detection windings 21 and 22 are connected to each other, the influence of the external magnetic flux can be suppressed.

  FIG. 2 is a radial sectional view of another reluctance resolver 200 of the present invention. The same members as those in FIG. 1 are denoted by the same reference numerals, and the description thereof is omitted. In FIG. 2, a rotating shaft 26 includes a rotor (movable element) 27 made of a magnetic material such as a silicon steel plate, in which 19 convex portions and 19 concave portions are arranged at equal intervals on the outer peripheral portion in a gear shape. Is fixed. The stator 3 includes adjacent teeth 7 and 8 constituting the third tooth set 301, teeth 11 and 12 constituting the third tooth set 302, and teeth 15 and teeth constituting the third tooth set 303. 16, the excitation winding 23 is wound around the teeth 19 and 4 constituting the third tooth set 304 by bundling two teeth. As shown in FIG. 2, the exciting winding 23 is wound counterclockwise (indicated by symbol A in FIG. 1) from the rotating shaft 1 toward the stator 3 in the adjacent third tooth set 301, An excitation winding 23 is wound around the third tooth set 302 clockwise (indicated by symbol C in FIG. 1) from the rotary shaft 1 toward the stator 3, and an excitation winding 23 is wound around the third tooth set 303. Is wound counterclockwise (indicated by symbol A in FIG. 1) from the rotating shaft 1 to the stator 3, and the excitation winding 23 extends from the rotating shaft 1 to the stator 3 in the third tooth set 304. It is wound clockwise (indicated by symbol C in FIG. 1). Thus, the excitation windings 23 are wound around the four third tooth sets so that the winding directions are alternately reversed. Other than the above, in the reluctance resolver 200 of the present embodiment, the first detection winding 21 of the reluctance resolver 100 shown in FIG. 2 is the same as the stator 3 of FIG. 1, and the magnetic characteristics are substantially equivalent.

With such a configuration, in the reluctance resolver 200 of FIG. 2, when an AC voltage of Ei = E · SINωt is applied to the excitation winding 23, the change in reluctance between the uneven shape of the rotor 27 and the teeth of the stator 3. Thus, the electromotive voltages Eoc2 and Eos2 as represented by Equation 3 and Equation 4 are generated in the first and second detection windings 24 and 25 depending on the rotational position θ2 of the rotation shaft 26.
Eoc2 = Eo · COS (19 · θ2) SIN (ωt) −− (Formula 3)
Eos2 = Eo · SIN (19 · θ2) SIN (ωt) −− (Formula 4)
In equations 3 and 4, if the sampling is performed at the timing of SINωt = 1 and the arctangent calculation is performed, the rotation angle θ2 of the rotating shaft 26 can be detected with 19 times the sensitivity. In addition, in the reluctance resolver as shown in FIG. 2, as in FIG. 1, most of the magnetic flux generated by the excitation winding 23 is wound around the first and second detection windings 24 and 25 via the rotor 27. Further, since each of the teeth 5, 6, 9, 10, 13, 14, 17, 18 passes through, the offset component included in the electromotive voltage generated in the first and second detection windings 24, 25 is very small. Further, since the reluctance with respect to the rotor 27 is substantially equal in the teeth 5 and 6, the teeth 9 and 10, the teeth 13 and 14, and the teeth 17 and 18, the external magnetic flux is also approximately equal. For this reason, the electromotive voltage caused by the external magnetic flux generated by the first and second detection windings 24 and 25 can be canceled almost completely.

  This embodiment has the same effect as the embodiment described with reference to FIG.

  With reference to FIG. 3, the reluctance type resolver 300 which is other embodiment is demonstrated. FIG. 3 is a cross-sectional view of the reluctance resolver 300 in the radial direction. In FIG. 3, the rotating shaft 31 has a rotor (movable element) 32 made of a magnetic material such as a silicon steel plate in which 30 convex portions and 30 concave portions are arranged at equal intervals on the outer periphery. It is fixed. The stator 33 is made of a magnetic material such as a silicon steel plate, and 24 teeth 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57. Teeth 34, 35, 36, 37 and teeth 37, 38, 39, 40, teeth 40, 41, 42, 43 and teeth 43, 44, 45, 46, and teeth 46, each grouping four consecutive teeth. , 47, 48, 49 and teeth 49, 50, 51, 52 and teeth 52, 53, 64, 55 and teeth 55, 56, 57, 34 are grouped every 45 degrees of phase angle L. Arranged at equal intervals, the teeth at both ends are shared with the adjacent group, and the excitation winding 28 is wound. Further, the tooth widths of the teeth 37, 40, 43, 46, 49, 52, 55, and 34 are substantially the same as the uneven pitch of the rotor 32, and the rotor 32 is independent of the rotational position of the rotating shaft 31. The reluctance change with is made almost constant. One excitation winding 28, one first detection winding 29, and one second detection winding 30 are wound around the 24 teeth 34 to 57 arranged in this way. ing.

  One excitation winding 28 indicated by a dotted line in FIG. 3 enters between the tooth 49 and the tooth 50 from one terminal 61 along the tooth 49 from the upper side to the lower side of the paper surface. 3 is wound counterclockwise (indicated by symbol A in FIG. 3) from the rotary shaft 1 to the stator 3, extends from the tooth 49 to the tooth 52, and clockwise around the tooth 52 (indicated by symbol C in FIG. 3). It is wound around. The excitation winding 28 is wound counterclockwise around the teeth 55 from the teeth 52 to the teeth 55, wound from the teeth 55 to the teeth 34, and wound around the teeth 34 in the clockwise direction. The excitation winding 28 is wound around the teeth 37 from the teeth 34 to the teeth 37, and is wound around the teeth 40 from the teeth 37 to the teeth 40 in the clockwise direction. The exciting winding 28 is wound from the tooth 40 to the tooth 43, wound around the tooth 43 counterclockwise, from the tooth 43 to the tooth 46, and wound around the tooth 46 in the clockwise direction. 46 and the tooth 47 are connected to the other terminal 62 from the lower side to the upper side.

  One first detection winding 29 shown by a solid line in FIG. 3 enters between the teeth 57 and 56 from one terminal 63 along the teeth 57 from the upper side to the lower side of the drawing. 3 is wound clockwise from the rotary shaft 1 toward the stator 3 (indicated by the symbol C in FIG. 3), crossed from the tooth 57 to the tooth 56, and counterclockwise around the tooth 56 (in FIG. 3). The first detection winding 29 is wound counterclockwise around the tooth 51 from the tooth 56 to the tooth 51, crosses from the tooth 51 to the tooth 50, and the first detection winding 29 is wound around the tooth 50. Wound clockwise around. The first detection winding 29 is wound clockwise around the teeth 45 from the teeth 50 to the teeth 45, is wound around the teeth 45 from the teeth 45, and is wound counterclockwise around the teeth 44. From the teeth 44 to the teeth 39, the teeth 39 are wound around the teeth 39 counterclockwise, from the teeth 39 to the teeth 38 and wound around the teeth 38 in the clockwise direction. The first detection winding 29 is connected between the tooth 38 and the tooth 39 from the lower side to the upper side on the paper surface and connected to the other terminal 64.

  One second detection winding 30 indicated by a one-dot chain line in FIG. 3 enters between the tooth 35 and the tooth 36 from one terminal 65 along the tooth 35 from the upper side to the lower side of the paper, It is wound around the tooth 35 in the clockwise direction (indicated by the symbol C in FIG. 3) from the rotary shaft 1 toward the stator 3, extends from the tooth 35 to the tooth 36, and counterclockwise around the tooth 36 (FIG. 3). (Indicated by symbol A). The second detection winding 30 is wound counterclockwise around the teeth 41 from the teeth 36 to the teeth 41, is wound around the teeth 42 from the teeth 41 to the teeth 42, and clockwise. The The second detection winding 30 is wound clockwise around the teeth 47 from the teeth 42 to the teeth 47, is wound around the teeth 48 from the teeth 47, and is wound counterclockwise around the teeth 48. The tooth 48 is wound around the tooth 53 in the counterclockwise direction, is wound around the tooth 53 from the tooth 53 to the tooth 54, and is wound around the tooth 54 in the clockwise direction. The second detection winding 30 is connected between the tooth 53 and the tooth 54 from the lower direction to the upper direction on the paper surface and is connected to the other terminal 66.

  In addition, the tooth 56 and the tooth 38, the tooth 57 and the tooth 39, the tooth 38 and the tooth 44, the tooth 39 and the tooth 45, the tooth 39 and the tooth 45, the tooth 44 and the tooth 50, and the tooth separated by 90 degrees, which is twice the phase angle L (2.L). 45 and teeth 51 are wound with first detection windings 29 in opposite directions so as to generate an electromotive voltage in the opposite direction with respect to the change in magnetic flux in the same direction. In addition, tooth 35 and tooth 41, tooth 36 and tooth 42, tooth 41 and tooth 47, tooth 42 and tooth 48, tooth 47 and tooth 53, tooth separated by 90 degrees twice the phase angle L (2.L). 48 and the teeth 54 are also wound with the second detection windings 30 in opposite directions so that an electromotive voltage in the opposite direction is generated with respect to the change in magnetic flux in the same direction.

  As described above, in the present embodiment, the first detection winding 29 includes the first tooth set 101 including the two adjacent teeth 38 and 39 and the first tooth including the two adjacent teeth 44 and 45. The set 102, the first tooth set 103 including the two adjacent teeth 50 and 51, and the first tooth set 104 including the two adjacent teeth 56 and 57 are double the phase angle L (2 · L ) Of the first set of teeth 38, 39, 44, 45, 50, 51, 56, 57 arranged at equal intervals and shifted by 90 degrees, and the second detection winding 30. Includes a second tooth set 201 including two adjacent teeth 35 and 36, a second tooth set 202 including two adjacent teeth 41 and 42, and a second tooth set including two adjacent teeth 47 and 48. The second tooth set 204 including the adjacent tooth set 203 and the two adjacent teeth 53 and 54 is 90 degrees that is twice the phase angle L (2 · L). It is wound around each tooth 35, 36, 41, 42, 47, 48, 53, 54 of the second set of teeth arranged at equal intervals, and the second set of teeth 101-104 and the second set The tooth sets 201 to 204 are arranged at equal intervals while being shifted by a phase angle L (45 degrees). And between the 1st tooth set 101-104 and the 2nd tooth set 201-204, one tooth | gear 37, 40, 43, 46, 49, 52, 55, 34 is arrange | positioned at equal intervals, respectively. Yes. The first detection winding 29 is wound around the two teeth 38 and 39, the teeth 44 and 45, the teeth 50 and 51, and the teeth 56 and 57 of the first tooth set 101 to 104 in opposite directions, The second detection winding 30 is wound around the two teeth 35 and 36, the teeth 41 and 42, the teeth 47 and 48, and the teeth 53 and 54 of the second tooth set 201 to 204 in opposite directions. The teeth 37, 40, 43, 46, 49, 52, 55, and 34 arranged between the first tooth sets 101 to 104 and the second tooth sets 201 to 204 are alternately wound in opposite directions. An exciting winding 28 is wound so as to be.

  Thus, the excitation winding 28 is wound counterclockwise around the teeth 37, 43, 49, 55, and the excitation winding 28 is wound clockwise around the teeth 34, 40, 46, 52. . For this reason, when a current is passed through the exciting winding 28, the teeth 34 and 37, the teeth 37 and 40, the teeth 40 and 43, the teeth 43 and 46, and the teeth 43, which are wound in opposite directions, In the teeth 46 and 49, the teeth 49 and 52, the teeth 52 and 55, the teeth 55 and 34, magnetic fluxes in opposite directions are generated with respect to the direction toward the center of the rotating shaft 1. The generated magnetic flux has teeth 38 around which the first detection winding 29 adjacent to the tooth 37 is wound and teeth 39 around which the first detection winding 29 adjacent to the tooth 40 is wound. Produces magnetic fluxes in opposite directions with respect to the direction toward the center of the rotating shaft 1. Similarly, teeth 44 and teeth 45 around which the first detection winding 29 is wound, teeth 50 and 51, teeth 56 and 57, and teeth 35 and teeth around which the second detection winding 30 is wound. 36, the teeth 41 and 42, the teeth 47 and 48, and the teeth 53 and 54 generate magnetic fluxes in opposite directions with respect to the direction toward the center of the rotary shaft 1.

  Since the first detection winding 29 is wound counterclockwise in the teeth 39 and the teeth 38 wound in the clockwise direction, an electromotive voltage in the opposite direction is generated with respect to the change in magnetic flux in the same direction. When the direction of the magnetic flux generated by the excitation winding 28 is opposite between the teeth 38 and 39 as described above, the first detection winding 29 wound around the teeth 38 and 39 includes An electromotive force in the same direction is generated. On the other hand, the teeth 38 and teeth 39 around which the first detection winding 29 is wound are subjected to substantially the same magnetic flux change by the external magnetic flux, so that the electromotive forces generated by the external magnetic flux are reversed and cancel each other. . Similarly, a counter electromotive force is generated in the teeth 35 wound clockwise around the second detection winding 30 and the teeth 36 wound counterclockwise against the magnetic flux change in the same direction. Therefore, when the direction of the magnetic flux generated by the excitation winding 28 is opposite between the teeth 35 and 36 as described above, an electromotive force in the same direction is generated. On the other hand, the teeth 35 and the teeth 36 around which the second detection winding 30 is wound are subjected to substantially the same magnetic flux change by the external magnetic flux, so that the electromotive forces generated by the external magnetic flux are reversed and cancel each other. It will be.

With such a configuration, in the reluctance resolver of FIG. 3, when an AC voltage of Ei = E · SINωt is applied to the excitation winding 28, the change in reluctance between the uneven shape of the rotor 32 and the teeth of the stator 33 Depending on the rotational position θ3 of the rotating shaft 31, the first and second detection windings 29 and 30 generate electromotive voltages Eoc3 and Eos3 as in Expressions 5 and 6.
Eoc3 = Eo · COS (30 · θ3) SIN (ωt) −− (Formula 5)
Eos3 = Eo · SIN (30 · θ3) SIN (ωt) −− (Formula 6)
In Expressions 5 and 6, if the sampling is performed at the timing of SINωt = 1 and the arctangent calculation is performed, the rotation angle θ3 of the rotating shaft 31 can be detected with 30 times the sensitivity. Further, in the reluctance type resolver 300 as shown in FIG. 3, most of the magnetic flux generated by the excitation winding 28 passes through the rotor 33 in the same manner as the reluctance type resolvers 100 and 200 shown in FIGS. Since the detection windings 29 and 30 pass through the wound teeth, the offset component included in the electromotive voltage generated in the first and second detection windings 29 and 30 is very small. Further, the teeth 35 and 36 constituting the second tooth set 201, the teeth 38 and 39 constituting the first tooth set 101, the teeth 41 and 42 constituting the second tooth set 202, the first tooth The teeth 44 and 45 constituting the set 102, the teeth 47 and 48 constituting the second tooth set 203, the teeth 50 and 51 constituting the first tooth set 103, and the second tooth set 204 are constituted. In the teeth 53 and 54 and the teeth 56 and the teeth 57 constituting the first tooth set 104, the reluctance with respect to the rotor 32 is substantially equal, so that the external magnetic flux is also substantially equal. For this reason, the electromotive voltage caused by the external magnetic flux generated by the first and second detection windings 29 and 30 can be canceled almost completely. Further, in the reluctance type resolver 300 as shown in FIG. 3, the number of teeth around which the exciting winding 28 is wound can be halved with respect to the reluctance type resolvers 100 and 200 shown in FIGS. There is a feature that it is easy to secure a winding space. Further, since the structures of the stator 33 and the rotor 32 are the same every 180 degrees, the position detection accuracy is not easily changed even if the position of the rotor 32 is slightly displaced.

  In each of the embodiments described above, the rotary type reluctance resolver has been described. However, a linear reluctance type resolver can also be realized by developing a rotor (movable element) and a stator in a straight line. 2 and 3, the adjacent teeth around which the first and second detection windings 24, 25, 29, and 30 are wound are substantially the same as the pitch of the concave and convex portions of the rotor. By arranging it, the influence from the external magnetic flux can be almost completely canceled out, but the same effect can be obtained even with an integral multiple of the pitch of the irregularities of the rotor 32. In addition, although the adjacent teeth around which the first and second detection windings 24, 25, 29, 30 are wound are slightly shifted from the uneven pitch of the rotor, they are easily affected by external magnetic flux. It is also possible to reduce the error.

  1, 26, 31 Rotating shaft, 2, 27, 32 Rotor (mover), 3, 33 Stator, 20, 23, 28 Excitation winding, 21, 24, 29 First detection winding, 22, 25 , 30 second detection winding, 4-19, 34-57 teeth, 101-104 first tooth set, 201-204 second tooth set, 301-304 third tooth set, 61-66 terminal, 100, 200, 300 Reluctance resolver, 110 first tooth set, 210 second tooth set.

Claims (4)

A stator made of a magnetic material having a plurality of teeth;
A mover made of a magnetic material having irregularities on the side facing the stator teeth;
A first detection winding wound around each tooth of a first tooth set in which a plurality of first tooth sets including two adjacent teeth are arranged at equal intervals;
Second teeth wound around each tooth of a second tooth set in which a plurality of second tooth sets including two adjacent teeth are shifted from the first tooth sets by a predetermined phase angle and arranged at equal intervals. Detection winding of
An excitation winding wound around a third tooth set in which a plurality of third tooth sets including at least one tooth are arranged at equal intervals between the first tooth set and the second tooth set; With
A reluctance resolver for detecting a voltage change between the first detection winding and the second detection winding in accordance with the movement of the mover to obtain a movable position of the mover;
The first detection winding is wound around the two teeth of the first tooth set so as to generate electromotive voltages opposite to each other with respect to a change in magnetic flux in the same direction,
The second detection winding is wound around the two teeth of the second tooth set so that electromotive voltages in opposite directions are generated with respect to a change in magnetic flux in the same direction,
The excitation winding is wound around the third tooth set so that magnetic fluxes in opposite directions are generated alternately.
A reluctance type resolver characterized by A reluctance resolver according to claim 1,
The other first of the first set of teeth, the phase angle of which is shifted from the respective teeth of the first set of teeth of the first set of teeth by twice the predetermined phase angle. The first detection winding is wound around each tooth of the tooth set such that an electromotive force is generated in the opposite direction with respect to the change in magnetic flux in the same direction,
The second tooth set of the second tooth set is arranged with a phase angle shifted from the respective teeth of the second tooth set of the second tooth set by twice the predetermined phase angle. The second detection winding is wound around each tooth of the tooth set so that an electromotive force in the opposite direction is generated with respect to a change in magnetic flux in the same direction.
A reluctance type resolver characterized by A reluctance resolver according to claim 1 or 2, wherein
The third tooth set includes a plurality of adjacent teeth;
The excitation winding is wound around each tooth so that magnetic flux is generated in the same direction;
A reluctance type resolver characterized by A reluctance resolver according to claim 1 or 2, wherein
The third tooth set includes a plurality of adjacent teeth;
The excitation winding is wound by bundling the teeth;
A reluctance type resolver characterized by

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