JP5939868B2 - Variable reluctance resolver - Google Patents

Description

  The present invention relates to a variable reluctance resolver having a one-phase input and two-phase output.

  2. Description of the Related Art A brushless motor is known in which a variable reluctance resolver that detects a rotation angle of a rotor rotated with respect to a stator that forms a magnetic field is provided. The variable reluctance resolver has a rotor and a stator. The rotor is generally configured by laminating magnetic steel plates, and is fixed to the rotor shaft. In the stator, an excitation winding and an output winding are wound around a plurality of teeth arranged around the rotor. When an excitation voltage is applied to the excitation winding, output voltages having different phases corresponding to the rotation of the rotor are output from the output winding based on the excitation of the excitation winding. Based on this output voltage, the rotation angle of the rotor, that is, the rotation angle of the rotor of the brushless motor is detected. The rotation of the brushless motor is controlled based on the detected rotation angle.

  Patent Document 1 describes a motor with a resolver that suppresses the influence of eccentricity of a rotor by winding an excitation winding and an output winding around a tooth based on a predetermined rule.

  In the resolver output signal, various resolvers are referred to as “nX”, where n is a sine wave cycle of the voltage output during one revolution of the resolver rotor. For example, a resolver that outputs a two-cycle sine wave during one revolution of the resolver rotor is referred to as “2X”.

JP 2012-34564 A

  Depending on the number of poles of the brushless motor, the appropriate “nX” value required for the resolver differs. In general, a relationship of n = (number of motor poles) / 2 is established. For example, in an 8-pole brushless motor, a “4 ×” resolver is used. However, since the “1 ×” resolver has a function of detecting an absolute position of 360 ° (mechanical angle), it can be used regardless of the number of poles of the brushless motor. However, the “1 ×” resolver has a lower resolution than a higher-order resolver. Therefore, with only the “1 ×” resolver, when the rotation of the brushless motor is low, the rotation may not be controlled with the required accuracy.

  On the other hand, in the invention according to Patent Document 1, since an 18-slot, 16-pole brushless motor is used, an “8 ×” resolver is used. In such a resolver having a large value of “nX”, the output at the time of high-speed rotation exceeding 10,000 rpm becomes a high frequency, and it may be difficult to detect the rotation angle by the phase detection circuit.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a variable reluctance resolver capable of detecting an absolute position, detecting a rotation angle with high accuracy during low-speed rotation, and adapting to high-speed rotation. Is to provide.

  (1) A variable reluctance resolver according to the present invention includes a stator in which sixteen teeth are arranged radially inward from a cylindrical core yoke, and a rotor that is provided inside the stator and extends in the axial direction. A shaft, a 1X first rotor fitted on the rotor shaft, and a 6X or 10X second fitted on the rotor shaft and arranged side by side in the axial direction of the first rotor and the rotor shaft And a rotor. The sixteen teeth are arranged in order from the first tooth to the sixteenth tooth, changing the position in the circumferential direction, and in the order of the circumferential direction, the second, fourth, sixth, eighth, tenth and twelfth teeth. The fourteenth and sixteenth teeth are arranged at equal intervals in the circumferential direction so as to face the first rotor in the radial direction, and in the circumferential direction, the first, third, fifth, seventh, The ninth, eleventh, thirteenth and fifteenth teeth are arranged at equal intervals in the circumferential direction so as to face the second rotor in the radial direction, and the second, fourth, sixth, eighth and tenth teeth. The twelfth, fourteenth, and sixteenth teeth are wound with at least one of an excitation coil, a first output coil, and a second output coil for detecting the rotation angle of the first rotor. In the first, third, fifth, seventh, ninth, eleventh, thirteenth and fifteenth teeth, Excitation coil for detecting the rotation angle of the motor, at least one of the third output coil or the fourth output coil is wound.

  The present invention includes a “1X” first rotor and a “6X” or “10X” second rotor. When the rotation is high speed, a signal based on the rotation of the second rotor becomes a high frequency, and it may be difficult to detect the rotation angle depending on the performance of the phase detection circuit. In that case, the rotation angle can be reliably detected by using the signal based on the first rotor. When the rotation is low, the rotation angle can be detected with high accuracy by using a signal based on the rotation of the second rotor.

  Moreover, since the variable reluctance type resolver according to the present invention includes the “1 ×” first rotor, it can cope with the number of poles of many brushless motors.

  The second, fourth, sixth, eighth, tenth, twelfth, fourteenth, sixteenth teeth and the first, third, fifth, seventh, ninth, eleventh, thirteenth, Since the 15 teeth are alternately arranged along the circumferential direction, they do not overlap in the axial direction. That is, the dimension in the axial direction can be reduced as compared with the case where two resolvers are simply provided.

  (2) The variable reluctance resolver according to the present invention may further include an intermediate member interposed between the first rotor and the second rotor. The maximum dimension of the outer diameter of the intermediate member is smaller than the minimum dimension of the outer diameter of the first rotor and the second rotor.

  Since the intermediate member forms a constant distance between the first rotor and the second rotor, the second, fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth teeth. It is reduced that the magnetic field due to is affected by the rotation of the second rotor. Further, the magnetic field generated by the first, third, fifth, seventh, ninth, eleventh, thirteenth, and fifteenth teeth is reduced from being affected by the rotation of the first rotor.

  (3) The exciting coils wound around adjacent teeth in the second, fourth, sixth, eighth, tenth, twelfth, fourteenth, and sixteenth teeth are opposite to each other. The excitation coils wound around the adjacent teeth in the first, third, fifth, seventh, ninth, eleventh, thirteenth and fifteenth teeth are mutually wound. The direction may be reversed.

  (4) The exciting coil may be one continuously wound around the first to sixteenth teeth.

  When two resolvers are simply provided, two windings are required for the excitation coil. However, in this configuration, all the excitation coils can be excited by one excitation winding, saving space. Is possible.

  (5) In the second, fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth teeth, the first output coil or the second output wound around the teeth facing in the radial direction The coils are wound in opposite directions and wound around teeth that are opposed in the radial direction in the first, third, fifth, seventh, ninth, eleventh, thirteenth, and fifteenth teeth. The third output coil or the fourth output coil may have the same winding direction.

  (6) The core yoke may be one in which steel plates are laminated and fixed to each other.

  (7) The first output coil is wound around the fourth tooth and the sixth tooth in the first direction, and the twelfth tooth and the fourteenth tooth include the first output coil. Is wound in a second direction opposite to the first direction, and the second output coil is wound around the second tooth and the sixteenth tooth in the first direction. The second output coil is wound around the eighth tooth and the tenth tooth in the second direction. The third output coil is wound around the third tooth and the eleventh tooth. The third output coil is wound in the second direction around the seventh tooth and the fifteenth tooth, and the first tooth and the ninth tooth are wound around the first tooth and the ninth tooth. The fourth output coil is wound in the first direction. Ri, above the fifth tooth and 13th teeth of said fourth output coil may be wound in the second direction.

  According to the variable reluctance type resolver according to the present invention, the absolute position can be detected, the rotation angle can be detected with high accuracy during low-speed rotation, and high-speed rotation can be supported.

FIG. 1 is a perspective view of a resolver 10 according to an embodiment of the present invention. FIG. 2 is a schematic diagram showing a state in which the resolver 10 is installed. FIG. 3 is a perspective view showing components of the resolver 10 separated along the axis L1. FIG. 4A is a front view of the resolver 10. FIG. 4B is a cross-sectional view taken along the line BB in FIG. FIG. 4C is a cross-sectional view taken along the line CC of FIG. FIG. 5 shows the arrangement of the coils and the winding direction in the teeth T1 to T16. (A) corresponds to the exciting coil 60, (B) corresponds to the first output coil 61, (C) corresponds to the second output coil 62, (D) corresponds to the third output coil 63, and (E) corresponds to the fourth output coil 64, respectively. doing. “◯” indicates that the coil is wound clockwise, and “●” indicates that the coil is wound counterclockwise. FIG. 6 is a cross-sectional view showing a modified example of the resolver 10.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings. In addition, this embodiment is only an example of this invention and can be suitably changed in the range which does not change the summary of this invention.

  A resolver 10 shown in FIG. 1 (an example of a variable reluctance resolver of the present invention) includes a cylindrical stator 20, and a first rotor 30 and a second rotor 40 that rotate inside the stator 20. The resolver 10 is a so-called variable reluctance type resolver in which the first rotor 30 and the second rotor 40 do not have windings. As shown in FIG. 2, the resolver 10 is attached to a casing 51 of a device 50 (for example, a brushless motor) having a rotating shaft 52 (an example of a rotor shaft of the present invention) in an installed state. The resolver 10 transmits a signal based on the rotation angle of the rotation shaft 52 to the detection circuit 54 via the cable 53. In FIG. 1, the first rotor 30 and the second rotor 40 are shown separated from the stator 20, but the present embodiment will be described below on the assumption of the installation state of FIG. 2.

[First rotor 30]
As shown in FIGS. 3 and 4, the first rotor 30 has a substantially cylindrical shape with a shaft hole 31 opened at the center. The inner diameter and shape of the shaft hole 31 are appropriately changed according to the rotation shaft 52 to be inserted. The first rotor 30 is formed by laminating a plurality of non-oriented electrical steel sheets and fixing them by caulking or the like.

  The distance from the axis L1 (FIG. 3) serving as the rotation center of the rotation shaft 52 to the outer peripheral surface of the first rotor 30 continuously changes along the circumferential direction. That is, the first rotor 30 is formed in a shape in which the gap permeance between the first rotor 30 and the stator 20 changes in a sine wave shape with respect to the angle θ in the rotation direction of the first rotor 30. In the first rotor 30 in the present embodiment, the angle θ necessary for one cycle of the sine wave is 360 °. In other words, when the first rotor 30 makes one rotation, “1X” is output in which one cycle of a sine wave is output. The first rotor 30 is disposed inside an annulus formed by the teeth T2, T4, T6, T8, T10, T12, T14, and T16. Details will be described later.

[Second rotor 40]
As shown in FIGS. 3 and 4, the second rotor 40 has a substantially cylindrical shape with a shaft hole 41 opened at the center. The inner diameter and shape of the shaft hole 41 are the same as those of the shaft hole 31. Similar to the first rotor 30, the second rotor 40 is formed by laminating a plurality of non-oriented electrical steel sheets and fixing them by caulking or the like.

  Ten protrusions protrude radially from the outer periphery of the second rotor 40 in plan view. The tip of each protrusion is curved, and the distance from the axis L1 to the outer peripheral surface of the second rotor 40 continuously changes along the circumferential direction. That is, the second rotor 40 is formed in a shape in which the gap permeance between the second rotor 40 and the stator 20 changes in a sine wave shape with respect to the angle θ in the rotation direction of the second rotor 40. Since the second rotor 40 in the present embodiment has ten protrusions, the angle θ required for one cycle of the sine wave is 360/10 = 36 °. That is, when the second rotor 40 makes one rotation, “10X” is output, which is a sine wave of 10 cycles. The second rotor 40 is disposed inside an annulus formed by the teeth T1, T3, T5, T7, T9, T11, T13, and T15. Details will be described later.

[Stator 20]
As shown in FIGS. 3 and 4, the stator 20 includes a substantially cylindrical core yoke 21 and 16 teeth T <b> 1 to T <b> 16. Although omitted in FIGS. 1 and 3, the exciting coils 60 are respectively wound around the teeth T <b> 1 to T <b> 16. In addition, any one of the first output coil 61, the second output coil 62, the third output coil 63, or the fourth output coil 64 is wound around the teeth T1 to T16. The first output coil 61, the second output coil 62, the third output coil 63, and the fourth output coil 64 are electrically connected to the detection circuit 54 through the cable 53. Here, each of the teeth T1 to T16 corresponds to the first to sixteenth teeth of the present invention. That is, with x as a variable, the tooth Tx corresponds to the xth tooth of the present invention.

  The teeth T1 to T16 protrude from the core yoke 21 inward in the radial direction. On one side (right side in FIG. 3) of the core yoke 21 in the direction of the axis L1 (an example of the axial direction of the present invention), the teeth T2, T4, T6, T8, T10, T12, T14, T16 is arranged in an annular shape. Teeth T1, T3, T5, T7, T9, T11, T13, and T15 are arranged in an annular shape along the circumferential direction on the other side (the side in FIG. 3) from the center. The stator 20 is formed by, for example, pressing a non-directional electric steel plate (not shown, an example of the steel plate of the present invention) having a predetermined thickness into a plan view shape shown in FIG. 4, and laminating a plurality of the steel plates by caulking or the like. It is fixed integrally.

  The first rotor 30 is disposed inside an annulus formed by the teeth T2, T4, T6, T8, T10, T12, T14, and T16. In the radial direction of the ring, the outer peripheral surface of the first rotor 30 faces the teeth T2, T4, T6, T8, T10, T12, T14, and T16, respectively. The second rotor 40 is disposed inside an annulus formed by the teeth T1, T3, T5, T7, T9, T11, T13, and T15. In the radial direction of the ring, the outer peripheral surface of the second rotor 40 faces the teeth T1, T3, T5, T7, T9, T11, T13, and T15. The first rotor 30 and the second rotor 40 are overlapped in the direction of the axis L1. The first rotor 30 and the second rotor 40 are fixed and integrated by caulking or the like, but may be integrated via a rotating shaft 52.

  The teeth T2, T4, T6, T8, T10, T12, T14, T16 and the teeth T1, T3, T5, T7, T9, T11, T13, T15 are arranged at positions that do not overlap in the direction of the axis L1. . Details will be described below. The teeth T2, T4, T6, T8, T10, T12, T14, and T16 are arranged so that the phase is shifted by 360/8 = 45 ° around the axis L1. Similarly, the teeth T1, T3, T5, T7, T9, T11, T13, and T15 are arranged so that the phase is shifted by 360/8 = 45 ° around the axis L1. Teeth T2, T4, T6, T8, T10, T12, T14, T16 are teeth T1, T3, T5, T7, T9, T11, T13 at positions rotated by 45/2 = 22.5 ° about the axis L1. , T15 are arranged. That is, as shown in FIG. 5, the teeth T2, T4, T6, T8, T10, T12, T14, T16 and the teeth T1, T3, T5, T7, T9, T11, T13, T15 are along the circumferential direction. Are alternately arranged.

  Hereinafter, with reference to FIG. 5, the arrangement and winding directions of the exciting coil 60, the first output coil 61, the second output coil 62, the third output coil 63, and the fourth output coil 64 in the teeth T <b> 1 to T <b> 16 are determined. Explained. “◯” and “●” written on the extension lines of the teeth T1 to T16 indicate the winding directions of the coils in the teeth T1 to T16. A state where the coil is wound clockwise as viewed from the center side of the stator 20 is indicated by “◯”, and a state where the coil is wound counterclockwise is indicated by “●”.

  FIG. 5A shows the arrangement of the exciting coil 60 and the direction of winding. As shown in FIG. 5A, the exciting coil 60 is wound around all the teeth T1 to T16. The exciting coil 60 is wound clockwise around the teeth T3, T4, T7, T8, T11, T12, T15, and T16, and is wound around the teeth T1, T2, T5, T6, T9, T10, T13, and T14. On the other hand, it is wound counterclockwise. That is, the exciting coil 60 is wound around the adjacent teeth among the teeth T2, T4, T6, T8, T10, T12, T14, and T16 facing the first rotor 30 in opposite directions. Further, the exciting coil 60 is wound around the adjacent teeth among the teeth T1, T3, T5, T7, T9, T11, T13, and T15 facing the second rotor 40 in opposite directions.

  The exciting coil 60 is formed by winding one exciting winding (not shown) around each of the teeth T1 to T16. The winding start of the exciting winding is a tooth T1, and the winding end is a tooth T16. That is, the exciting winding is wound in the order of teeth T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, T14, T15, T16. The winding start portion and winding end portion of the excitation winding are electrically connected to the detection circuit 54. When a voltage is applied from the detection circuit 54 to the excitation winding, each excitation coil 60 generates a magnetic field corresponding to the winding direction.

  FIG. 5B shows the arrangement of the first output coil 61 and the winding direction. As shown in FIG. 5B, the first output coil 61 is wound around the teeth T4, T6, T12, and T14. The first output coil 61 is wound clockwise around the teeth T4 and T6, and is wound counterclockwise around the teeth T12 and T14. That is, the first output coil 61 is wound in the opposite directions around the teeth and the T4 teeth T12 that are opposed in the radial direction. Moreover, the 1st output coil 61 is wound by the mutually opposite direction with respect to the teeth T6 and teeth T14 which oppose to radial direction.

  The first output coil 61 is formed by winding one first output winding (not shown) around the teeth T4, T6, T12, and T14. The winding start of the first output winding is a tooth T4, and the winding end is a tooth T14. That is, the first output winding is wound in the order of teeth T4, T6, T12, and T14. The winding start portion and winding end portion of the first output winding are electrically connected to the detection circuit 54.

  FIG. 5C shows the arrangement of the second output coil 62 and the winding direction. As shown in FIG. 5C, the second output coil 62 is wound around the teeth T2, T8, T10, and T16. The second output coil 62 is wound clockwise around the teeth T2 and T16, and is wound counterclockwise around the teeth T8 and T10. That is, the second output coil 62 is wound in the opposite directions around the teeth T2 and the teeth T10 that are opposed in the radial direction. The second output coil 62 is wound around the teeth T8 and the teeth T16 opposed in the radial direction in opposite directions.

  The second output coil 62 is formed by winding one second output winding (not shown) around the teeth T2, T8, T10, and T16. The winding start of the second output winding is a tooth T2, and the winding end is a tooth T16. That is, the second output winding is wound in the order of teeth T2, T8, T10, T16. The winding start portion and the winding end portion of the second output winding are electrically connected to the detection circuit 54.

  FIG. 5D shows the arrangement and winding direction of the third output coil 63. As shown in FIG. 5D, the third output coil 63 is wound around the teeth T3, T7, T11, and T15. The third output coil 63 is wound clockwise around the teeth T3 and T11, and is wound counterclockwise around the teeth T7 and T15. That is, the third output coil 63 is wound in the same direction around the teeth T3 and the teeth T11 opposed in the radial direction. The third output coil 63 is wound in the same direction around the teeth T7 and the teeth T15 facing in the radial direction.

  The third output coil 63 is formed by winding one third output winding (not shown) around the teeth T3, T7, T11, and T15. The winding start of the third output winding is a tooth T3, and the winding end is a tooth T15. That is, the third output winding is wound in the order of teeth T3, T7, T11, and T15. The winding start portion and the winding end portion of the second output winding are electrically connected to the detection circuit 54.

  FIG. 5E shows the arrangement of the fourth output coil 64 and the winding direction. As shown in FIG. 5E, the fourth output coil 64 is wound around the teeth T1, T5, T9, and T13. The fourth output coil 64 is wound clockwise around the teeth T1 and T9, and is wound counterclockwise around the teeth T5 and T13. That is, the fourth output coil 64 is wound in the same direction around the teeth T1 and the teeth T9 that are opposed in the radial direction. The fourth output coil 64 is wound in the same direction around the teeth T5 and the teeth T13 that are opposed in the radial direction.

  The fourth output coil 64 is formed by winding one fourth output winding (not shown) around the teeth T1, T5, T9, and T13. The winding start of the fourth output winding is the teeth T1, and the winding end is the teeth T13. That is, the fourth output winding is wound in the order of teeth T1, T5, T9, and T13. The winding start portion and the winding end portion of the second output winding are electrically connected to the detection circuit 54.

  Table 1 shows a summary of the arrangement and winding directions of the excitation coil 60, the first output coil 61, the second output coil 62, the third output coil 63, and the fourth output coil 64 described above. In Table 1, “R” indicates that the coil is wound clockwise, and “L” indicates that the coil is wound counterclockwise. “-” Indicates that the coil is not wound.

  As described above, the exciting coil 60 and any one of the output coils are wound around all the teeth T1 to T16. In this embodiment, the exciting coil 60 is wound on the inner peripheral side, and the output coil is wound on the outer peripheral side. However, this configuration is an example, and the output coil may be wound on the inner peripheral side, and the exciting coil 60 may be wound on the outer peripheral side. Further, the number of turns of the exciting coil 60 is the same in all the teeth T1 to T16, and is 44 in this embodiment. The number of turns of the first output coil 61, the second output coil 62, the third output coil 63, and the fourth output coil 64 is the same in all the teeth T1 to T16, and is 400 turns in this embodiment.

[Operation of resolver 10]
When the resolver 10 is used, an AC voltage is applied from the detection circuit 54 to the excitation winding via the cable 53. Thereby, the exciting coils 60 of the teeth T1 to T16 are respectively excited. When the first rotor 30 rotates integrally with the rotary shaft 52, the gap permeance between the first rotor 30 and the teeth T2, T4, T6, T8, T10, T12, T14, and T16 changes, and the SIN from the first output winding is changed. One of the output voltage and the COS output voltage is output, and the other is output from the second output winding. When the second rotor 40 rotates integrally with the rotary shaft 52, the gap permeance between the second rotor 40 and the teeth T1, T3, T5, T7, T9, T11, T13, T15 changes, and the third output winding. One of the SIN output voltage and the COS output voltage is output from, and the other is output from the fourth output winding. These SIN / COS output voltages are output to the detection circuit 54 via the cable 53.

  As described above, since the first rotor 30 has the characteristic “1X”, the waveform output from the first output winding and the second output winding is one cycle per 360 ° rotation angle. Further, since the second rotor 40 has a characteristic of “10X”, the waveforms output from the third output winding and the fourth output winding are 10 cycles per 360 ° rotation angle.

  The detection circuit 54 obtains the rotation angle of the first rotor 30 and the second rotor 40, that is, the rotation angle of the rotation shaft 52 based on the SIN output voltage and the COS output voltage output from the first to fourth output windings. The detection circuit 54 selectively uses the outputs of the first output winding and the second output winding, or the outputs of the third output winding and the fourth output winding, depending on the rotational speed of the rotary shaft 52. Also good. When the rotation of the rotating shaft 52 is high speed, for example, when the rotation is above the threshold, the output voltages from the first output winding and the second output winding are used. When the rotation of the rotating shaft 52 is low speed, for example, less than the threshold value. In this case, the output voltage from the third output winding and the fourth output winding may be used.

[Effects of Embodiment]
The resolver 10 includes a “1 ×” first rotor 30 and a “10 ×” second rotor 40. When the rotation of the rotating shaft 52 is high speed, the rotation angle can be ensured by using a signal based on the rotation of the first rotor 30, that is, the output voltage from the first output winding and the second output winding. Can be detected. Further, when the rotation of the rotary shaft 52 is low speed, the rotation angle is set by using the signal based on the rotation of the second rotor 40, that is, the output voltage from the third output winding and the fourth output winding. It can be detected with high accuracy.

  Further, since the resolver 10 includes the “1 ×” first rotor 30, the resolver 10 can cope with the number of poles of many brushless motors, and the absolute position can be detected, so that the position can be controlled.

  Further, the teeth T2, T4, T6, T8, T10, T12, T14, T16 and the teeth T1, T3, T5, T7, T9, T11, T13, T15 are alternately arranged along the circumferential direction. Both do not overlap in the direction of the axis L1. That is, the dimension in the direction of the axis L1 can be reduced as compared with the case where two resolvers are simply provided.

  In addition, when two resolvers are simply provided, two windings used for the excitation coil are required, but in the resolver 10 according to the above-described embodiment, all the excitation coils 60 are formed by one excitation winding. The space can be saved.

[Modification 1]
In the above-described embodiment, the second rotor 40 has the characteristic of “10X” in which ten protrusions protrude radially, but the second rotor 40 has six protrusions radially. It may have the characteristic of “6X” protruding.

[Modification 2]
As shown in FIG. 6, an intermediate member 70 may be interposed between the first rotor 30 and the second rotor 40. The intermediate member 70 is a substantially circular non-directional electric steel plate. However, the maximum dimension of the intermediate member 70 in the radial direction is smaller than the minimum dimension of the first rotor 30 and the second rotor 40. That is, the intermediate member 70 is accommodated inside the first rotor 30 and the second rotor 40 in the radial direction when viewed from the direction of the axis L1. The first rotor 30, the second rotor 40, and the intermediate member 70 are integrally formed by being fixed by caulking or the like while being stacked in the direction of the axis L <b> 1.

  When the first rotor 30 and the second rotor 40 are directly stacked, the magnetic field generated by the teeth T2, T4, T6, T8, T10, T12, T14, and T16 is affected by the rotation of the second rotor 40, and the teeth. The magnetic field generated by T1, T3, T5, T7, T9, T11, T12, and T15 may be affected by the rotation of the first rotor 30. As a result, an error may occur in the SIN output voltage and the COS output voltage output from the first to fourth output windings.

  In this modification, since a gap is formed between the first rotor 30 and the second rotor 40 by the intermediate member 70, the magnetic fields of the teeth T2, T4, T6, T8, T10, T12, T14, T16 are the second. It becomes difficult to reach the rotor 40, and the magnetic fields of the teeth T 1, T 3, T 5, T 7, T 9, T 11, T 12, T 15 are difficult to reach the first rotor 30. This reduces the effects of the problems described above.

10 ... Resolver (variable reluctance resolver)
20 ... Stator 21 ... Core yoke 30 ... First rotor 40 ... Second rotor 52 ... Rotating shaft (rotor shaft)
60 ... excitation coil 61 ... first output coil 62 ... second output coil 63 ... third output coil 64 ... fourth output coil 70 ... intermediate member T1 ... teeth ( 1st tooth)
T2 ... Teeth (Second Teeth)
T3 ... Teeth (Third Teeth)
T4 ... Teeth (4th Teeth)
T5 ... Teeth (Fifth Teeth)
T6 ... Teeth (Sixth Teeth)
T7 ... Teeth (Seventh Teeth)
T8 ... Teeth (Eighth Teeth)
T9 ... Teeth (9th Teeth)
T10 ... Teeth (10th Teeth)
T11 ... Teeth (Eleventh Teeth)
T12 ... Teeth (12th Teeth)
T13 ... Teeth (13th Teeth)
T14 ... Teeth (14th Teeth)
T15 ... Teeth (15th Teeth)
T16 ... Teeth (16th Teeth)

Claims (7)

A stator in which 16 teeth are arranged radially inward from a cylindrical core yoke;
A rotor shaft provided inside the stator and extending in the axial direction;
A 1X first rotor fitted on the rotor shaft;
A 6X or 10X second rotor that is externally fitted to the rotor shaft and arranged side by side in the axial direction of the rotor shaft;
The 16 teeth are arranged in order from the first tooth to the 16th tooth, changing the position in the circumferential direction,
In order of the circumferential direction, the second, fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth teeth are arranged at equal intervals in the circumferential direction facing the first rotor in the radial direction. The first, third, fifth, seventh, ninth, eleventh, thirteenth, and fifteenth teeth are circumferentially opposed to the second rotor in the order of the circumferential direction. Are arranged at equal intervals,
Second, fourth, sixth, eighth, tenth, twelfth, fourteenth, the sixteenth teeth, an exciting coil for detecting the rotation angle of the first rotor, the first output coil or the Either one of the two output coils is wound,
First, third, fifth, seventh, ninth, eleventh, thirteenth, and fifteenth tooth of the exciting coil for detecting the rotation angle of the second rotor, third output coil or the A variable reluctance resolver in which one of four output coils is wound. An intermediate member interposed between the first rotor and the second rotor;
The variable reluctance resolver according to claim 1, wherein a maximum outer diameter of the intermediate member is smaller than a minimum outer diameter of the first rotor and the second rotor. The exciting coils wound around the adjacent teeth in the second, fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth teeth are opposite to each other. ,
The exciting coils wound around the adjacent teeth in the first, third, fifth, seventh, ninth, eleventh, thirteenth and fifteenth teeth are wound in opposite directions. The variable reluctance resolver according to claim 1.   The variable reluctance resolver according to claim 3, wherein the exciting coil is wound continuously around the first to sixteenth teeth. In the second, fourth, sixth, eighth, tenth, twelfth, fourteenth and sixteenth teeth, the first output coil or the second output coil wound around the teeth facing in the radial direction is: Winding directions are opposite to each other,
In the first, third, fifth, seventh, ninth, eleventh, thirteenth and fifteenth teeth, the third output coil or the fourth output coil wound around the teeth facing in the radial direction is: The variable reluctance resolver according to any one of claims 1 to 4, wherein winding directions are the same.   The variable reluctance resolver according to any one of claims 1 to 5, wherein the core yoke is formed by laminating steel plates and being fixed to each other. The first output coil is wound around the fourth tooth and the sixth tooth in the first direction,
The twelfth tooth and the fourteenth tooth have the first output coil wound in a second direction opposite to the first direction,
The second output coil is wound around the second teeth and the sixteenth teeth in the first direction,
The second output coil is wound around the eighth tooth and the tenth tooth in the second direction,
The third output coil is wound around the third tooth and the eleventh tooth in the first direction,
The third output coil is wound around the seventh tooth and the fifteenth tooth in the second direction,
The fourth output coil is wound around the first teeth and the ninth teeth in the first direction,
The variable reluctance resolver according to any one of claims 1 to 6, wherein the fourth output coil is wound around the fifth tooth and the thirteenth tooth in the second direction.

Images