JP2009174925A - Rotation angle detector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotation angle detector that can have the detection accuracy further improved of its rotation angle. <P>SOLUTION: This rotation angle detector 1 includes a stator 100, comprising a plurality of stator cores disposed at given spaces on a support substrate made of a nonmagnetic material and each being equipped with a winding member; a rotor 160 provided rotatably in relation to the stator 100; and a converter for converting an output signal of each winding member into a digital signal, with the output signal changing according to the rotation of the rotor, and the converter is mounted on the support substrate. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotation angle detection device, and more particularly to a so-called variable reluctance type rotation angle detection device.

  Conventionally, this type of rotation angle detection device includes a resolver and an R / D (resolver / digital) converter. The resolver includes a stator and a rotor, and outputs an output signal corresponding to the rotation angle of the rotor with respect to the stator by utilizing the fact that the mutual inductance between the stator and the rotor changes depending on the rotation position of the rotor with respect to the stator. The R / D converter converts the output signal from the resolver into a digital signal. Thereby, the rotation angle detection device can output a digital signal corresponding to the rotational position of the rotor with respect to the stator.

  FIG. 13 is a diagram for explaining a conventional resolver. FIG. 13A is a diagram showing the structure of a conventional resolver, and FIG. 13B is a diagram showing the output voltage from the conventional resolver.

  In the conventional resolver 800, as shown in FIG. 13A, a one-phase excitation winding 804 and a two-phase output winding (SIN output winding 806 and COS output winding 807) are wound around a salient pole 803. This is a variable reluctance resolver including the stator 801 and a rotor 805 that is rotatably provided to the stator 801. The rotor 805 is an eccentric rotor having only an iron core and no windings, and the gap permeance between the rotor 805 and the stator 801 changes in a sinusoidal shape with respect to the rotation angle θ. Therefore, according to the conventional resolver 800, as shown in FIG. 13B, the rotation angle can be detected with high accuracy by measuring the gap permeance described above.

  FIG. 14 is a diagram for explaining a conventional resolver. FIG. 14A is a view showing a structure of a conventional resolver, and FIG. 14B is a view shown for explaining a winding structure in each slot of the conventional resolver.

  As shown in FIG. 14A, a conventional resolver 900 includes a one-phase excitation winding 904 and a two-phase output winding (a SIN output winding 906 and a COS output winding 907 (FIG. 14A shows a diagram). (Not shown))) is a variable reluctance resolver including a stator 901 wound around a salient pole 903 and a rotor 905 provided to be rotatable with respect to the stator 901. The rotor 905 is an eccentric rotor that has only an iron core and does not have windings. As in the case of the conventional resolver 800, the gap permeance between the rotor 905 and the stator 901 changes sinusoidally with respect to the rotation angle θ. . For this reason, according to the conventional resolver 900, as shown in FIG. 14B, the rotation angle can be detected with high accuracy by measuring the gap permeance described above.

  Further, in the conventional resolver 900, two-phase output windings (SIN output winding 906 and COS output winding 907) are wound sequentially in each slot 902 by one slot pitch (without slot skipping). (Not shown in FIG. 14 (a)), and further, as shown in FIG. 14 (b), distributed winding is performed so that each of the induced voltage distributions is a sine wave distribution. (The number of turns (amount) of the windings is also a sinusoidal distribution).

  For this reason, according to the conventional resolver 900, the detection accuracy of the rotation angle can be improved by reducing the high-frequency order from the low order to the high order included in the output voltage.

  The rotation angle detection device can convert the output signal from the resolver having the above configuration into a digital signal and output the converted digital signal.

JP-A-8-178611

  However, in the resolver of the conventional rotation angle detection device, in order to increase the detection accuracy of the rotation angle, it is necessary to wind the excitation winding and the output winding with high accuracy, so that the detection accuracy of the rotation angle is improved. There are limits. In addition, since the resolver of the rotation angle detector is placed in an environment where the signal propagation environment is not good, the output signal from the resolver is a signal even if the excitation winding and output winding of the resolver are wound with high accuracy. When the signal is transmitted to the R / D converter via a line, the reliability of the output signal is reduced due to noise or the like, and there is a limit to the improvement of the rotation angle detection accuracy.

  The present invention has been made in view of the above technical problems, and an object of the present invention is to provide a rotation angle detection device capable of further improving the detection accuracy of the rotation angle. It is in.

  In order to solve the above problems, the present invention provides a stator having a plurality of stator cores arranged on a support substrate made of a nonmagnetic material at a given interval, each having a winding member, and rotating with respect to the stator. A rotor provided freely, and a converter that converts an output signal of the winding member that changes according to the rotation of the rotor into a digital signal, and the rotation angle of the converter mounted on the support substrate Related to the detection device.

  According to the present invention, the converter includes the stator and the rotor, and when the output signal that changes according to the rotation angle of the rotor with respect to the stator is converted into a digital signal by the converter, the converter includes the stator core that constitutes the stator. Since the configuration of mounting on the support substrate and integrating is adopted, the output signal according to the rotation angle can greatly reduce the influence of noise and the like. As a result, the converter that receives the output signal can employ a configuration that eliminates the need for an additional circuit for impedance matching.

  Alternatively, at the design stage of the rotation angle detection device according to the present invention, the impedance characteristic of the signal line for transmitting the output signal can be known, so by creating a matching circuit corresponding to this impedance characteristic in the converter, at a low cost, It is possible to obtain a reliable and highly accurate rotation angle detection accuracy.

  In the rotation angle detection device according to the present invention, the rotor may have a shape in which the diameter of the outer contour line changes periodically.

  According to the present invention, it is not necessary to change the number of windings of the winding members of each stator core, and the number of windings of the winding members of each stator core can be made constant. As a result, it is possible to eliminate degradation in detection accuracy due to the accuracy of the winding.

  Further, in the rotation angle detection device according to the present invention, the support substrate may have a substantially C-shape with a given angle range cut out in a plan view.

  According to the present invention, when incorporating a rotor in a manufacturing process, there is no restriction on the manufacturing process, for example, the rotor can be inserted from the lateral direction, the degree of freedom in the manufacturing process is increased, and the manufacturing process is reduced. Cost can be reduced.

  In the rotation angle detection apparatus according to the present invention, the support substrate may be provided with a shield region at least at a part around the mounting region of the converter.

  According to the present invention, the electromagnetic influence of the winding member of each stator core on the converter can be reduced, and the detection accuracy of the rotation angle can be improved.

  Further, in the rotation angle detection device according to the present invention, the support substrate is a multilayer in which a plurality of substrates each having a coil portion formed so that a spiral conductive layer is wound around the winding core of each stator core. It is a board | substrate, the coil part of each layer is electrically connected through a through hole, and the said converter may be mounted in the board | substrate of the uppermost layer of the said multilayer board | substrate.

  According to the present invention, the number of excitation windings and the number of output windings can be adjusted by the number of substrates to be stacked, and the winding ratio can be easily adjusted.

  In the rotation angle detection device according to the present invention, the substrate of the other layer excluding the substrate on which the converter is mounted may have a shield region corresponding to the mounting region of the converter.

  According to the present invention, the electromagnetic influence of the winding member of each stator core on the converter can be reduced, and the detection accuracy of the rotation angle can be further improved.

  Further, in the rotation angle detection device according to the present invention, each stator core constituting the plurality of stator cores connects an upper stator plate, a lower stator plate, the upper stator plate and the lower stator plate, A winding magnetic core on which the winding member composed of an excitation winding and an output winding is wound outside, and the upper stator plate and the lower stator plate leave a magnetic gap, and It may be provided so as to sandwich a part of the outer peripheral region from both sides.

  In the present invention, since the rotor is inserted into the gap between the upper stator plate and the lower stator plate of the stator core, the overlapping area of the rotor and the stator core in the top view changes due to the rotation of the rotor and is formed in the stator. The magnetic flux passing through the magnetic path changes and the output signal changes. Therefore, according to the present invention, in addition to the effects of any one of the above-described inventions, the rotation angle detection device can be a flat type structure, so that the degree of freedom in mounting the rotation angle detection device can be increased.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not unduly limit the contents of the present invention described in the claims. Also, not all of the configurations described below are essential constituent requirements of the present invention.

  Below, although the resolver which comprises the rotation angle detection apparatus in embodiment which concerns on this invention is demonstrated as what is a 1 phase excitation 2 phase output type, this embodiment is not limited to this.

  FIG. 1 is a functional block diagram of a configuration example of a rotation angle detection device according to an embodiment of the present invention.

  The rotation angle detection device 1 in this embodiment includes a resolver 10 and an R / D converter (converter or conversion device in a broad sense) 500. The resolver 10 includes a stator and a rotor provided to be rotatable with respect to the stator, and in a state excited by one-phase excitation signals R1 and R2, a two-phase output corresponding to the rotation angle of the rotor with respect to the stator. Signals S1-S4 are output. The R / D converter 500 generates excitation signals R1 and R2 for the resolver 10, and also generates digital signals corresponding to the two-phase output signals S1 to S4 from the resolver 10, and outputs them as serial data or parallel data. .

FIG. 2 is a perspective view of the rotation angle detection device 1 according to this embodiment. In FIG. 2, the description will be made assuming that the axial multiplication angle of the rotor of the resolver 10 constituting the rotation angle detection device 1 in the present embodiment is 4 ×.
FIG. 3 shows a top view of the rotation angle detection device 1 in the present embodiment. In FIG. 3, the same parts as those in FIG.

  The rotation angle detection device 1 includes a resolver 10 that includes a stator 100 and a rotor 160 that is rotatably arranged with respect to the stator 100.

  The stator 100 is provided with a given interval (a given angular interval) on a ring-shaped support substrate made of a non-magnetic material (or as shown in FIG. 2, a substantially C shape with a part thereof cut out). It has a plurality of stator cores arranged and each having a winding member. The stator core is made of a magnetic material. In FIG. 2, the stator 100 includes four stator cores 162a, 162b, 162c, and 162d in order to output a two-phase output signal, but the present invention is not limited to the number of stator cores.

  The rotor 160 is made of a magnetic material, and has a shape in which the diameter of the outer contour line changes periodically in a top view. In FIG. 2, since the shaft angle multiplier is 4 ×, the outer contour line of the rotor 160 has a shape in which the change in diameter is four cycles.

  The stator 100 has a ring-shaped (or substantially C-shaped support part cut out as shown in FIG. 2) support 200, and stator cores 162a, 162b, 162c, 162d are fixed to the support 200. . The winding member of the stator core in the present embodiment is a sheet-like coil portion wound around the outer side of the winding core constituting the stator core, and the coil portions 172a, 172b, 172c of the stator cores 162a, 162b, 162c, 162d. , 172d are formed on a ring-shaped support substrate 180 made of a non-magnetic material (or a substantially C shape with a part cut away as shown in FIG. 2).

  Further, an R / D converter 500 is mounted on the support substrate 180 on which these coil portions are formed. More specifically, the terminal of the integrated circuit device that realizes the function of the R / D converter 500 is electrically connected to the conductive wiring pattern formed on the support substrate 180 on the support substrate 180. Installed.

  In the resolver 10, the support 200 supports the support substrate 180. The support substrate 180 is a multilayer substrate in which a plurality of substrates each having a coil portion formed so that a spiral conductive layer is wound around a winding magnetic core of each stator core. And the coil part of each layer is electrically connected through a through hole. The winding member includes a coil portion for exciting winding and a coil portion for output winding. By doing so, the number of excitation windings and the number of output windings can be adjusted by the number of substrates to be stacked, and the winding ratio can be easily adjusted.

  Further, as shown in FIG. 3, the support substrate 180 has a shield region at least at a part around the mounting region of the R / D converter (more specifically, the R / D converter and the circuit element) 500. Is provided to minimize electromagnetic influence between the winding members.

  As shown in FIG. 2 or FIG. 3, the support substrate 180 desirably has a substantially C-shape with a given angle range cut out in plan view. By doing so, when incorporating the rotor 160 in the manufacturing process of the resolver 10, there is no restriction in the manufacturing process, and for example, the rotor 160 can be inserted from the lateral direction. Thereby, the freedom degree of a manufacturing process becomes high and it becomes possible to aim at the cost reduction of a manufacturing process.

  As shown in FIG. 3, the resolver 10 is fixed to a fixing plate (not shown) through an attachment hole 220 and can be attached to a device on which a rotation angle detection device is mounted.

FIG. 4 is a perspective view of the stator core in the present embodiment. However, in FIG. 4, only one layer of the multilayer substrate constituting the support substrate 180 is illustrated.
FIG. 5 shows another perspective view of the stator core of FIG. 4 and 5 show a configuration example of the stator core 162a, the stator cores 162b, 162c, and 162d can be similarly configured.

  The stator core 162a includes an upper stator plate 196a, a lower stator plate 190a, and a winding magnetic core 194a. In FIG. 4, the illustration of the upper stator plate 196a is omitted. The winding magnetic core 194a connects the upper stator plate 196a and the lower stator plate 190a, and a winding member composed of an excitation winding and an output winding is wound on the outside thereof. In FIG. 4, the winding member is a coil portion formed on the support substrate 180. And as shown in FIG. 5, the protrusion parts 198a and 192a are integrally formed in the inner surface which the front-end | tip part of the upper stator plate 196a and the lower stator plate 190a mutually opposes, respectively.

  6 schematically shows a cross-sectional view taken along line AA in FIG. In FIG. 6, the same parts as those in FIG. 3, FIG. 4, or FIG.

  As shown in FIG. 6, the support 200 supports the support substrate 180, and the support substrate 180 includes a coil portion formed so that a spiral conductive layer is wound around the winding core of each stator core. It is a multilayer substrate in which a plurality of substrates are stacked. And the rotor 160 is inserted in the space | gap which protrusion part 198a, 192a opposes. That is, the upper stator plate 196a and the lower stator plate 190a are provided so as to sandwich a part of the outer peripheral region of the rotor 160 from both sides, leaving a magnetic gap.

  According to this embodiment, the diameter of the outer contour line of the rotor 160 has a shape that changes periodically and is inserted into the gap between the upper stator plate and the lower stator plate of the stator core. Due to the rotation, the overlapping area of the rotor 160 and the stator core in the top view changes, the magnetic flux passing through the magnetic path formed in the stator 100 changes, and the output signal changes. Therefore, a configuration for changing the number of windings of the winding members of each stator core is not required, and the number of windings of the winding members of each stator core can be made constant.

  Moreover, according to this embodiment, since the rotation angle detection device can be a flat structure, the degree of freedom in mounting the rotation angle detection device can be increased.

  Further, in such a configuration, by rotating the rotor 160, the magnetic flux passing through the magnetic path formed in the stator 100 can be easily concentrated on the protrusions 198a and 192a, and the leakage of the magnetic flux can be reduced. it can. Therefore, the detection accuracy of the rotation angle can be further improved.

FIG. 7 is an explanatory diagram of the excitation winding of the resolver 10 in the present embodiment.
FIG. 8 is an explanatory diagram of the output winding of the resolver 10 in the present embodiment.

  In the resolver 10 in the present embodiment, a plurality of substrates provided with a coil portion made of a spiral conductive layer oriented in the direction shown in FIGS. A coil portion as an excitation winding and a coil portion as an output winding are provided on any of the multilayer substrates constituting the support substrate 180. 7 and 8 schematically show one substrate constituting the multilayer substrate.

FIG. 9 shows a plan view of one substrate constituting the multilayer substrate.
FIG. 10 shows a plan view of another substrate constituting the multilayer substrate.

  9 and 10 are formed with coil portions wound around the outer sides of the stator cores. Like the substrates shown in FIGS. 9 and 10, the substrates constituting the multilayer substrate have substantially the same planar shape. The R / D converter 500 is mounted on the uppermost substrate among the plurality of substrates constituting the multilayer substrate as shown in FIG. The R / D converter 500 is electrically connected to the excitation winding and output winding of each stator core on this substrate. The substrate is provided with a shield region 420 around the mounting region 410 of the R / D converter 500 (at least a part of the periphery). The shield region 420 is provided so as to reduce the electromagnetic influence of the excitation winding and output winding of each stator core. A conductive pattern is formed in the shield region 420, and a voltage is applied to a given ground potential.

  Of the plurality of substrates constituting the multilayer substrate, for example, a coil portion functioning as an excitation winding is formed on the uppermost layer and the lowermost substrate, and an output winding is formed on the intermediate layer substrate between the uppermost layer and the lowermost layer. As a result, a coil portion is formed. In this case, the R / D converter 500 is mounted on a substrate on which a coil portion that functions as an excitation winding is formed.

  In addition, among the plurality of substrates constituting the multilayer substrate, the substrate of the other layer excluding the substrate on which the R / D converter 500 is mounted has a shield region 430 corresponding to the mounting region 410 of the R / D converter. . That is, as shown in FIG. 10, the shield region 430 is provided in the lower layer region of the mounting region 410 of the R / D converter 500 on the substrate of FIG. The shield region 430 is desirably a region that overlaps with the entire mounting region 410 of the R / D converter 500 of the substrate in FIG. As a result, the electromagnetic influences of the R / D converter 500 and the excitation winding and output winding of each stator core can be further reduced.

  FIG. 11 shows a functional block diagram of the R / D converter 500 in the present embodiment.

  The R / D converter 500 includes a differential amplifier DIF1, DIF2, multipliers MUL1 to MUL3, an adder ADD1, a loop filter 502, a bipolar VCO (Voltage Controlled Oscillator) 504, an up / down counter 506, a read only memory (Read Only Memory). 508, digital-analog converters DAC1 and DAC2, output processing circuit 510, and signal generation circuit 512.

The signal generation circuit 512 generates excitation signals R1 and R2 and outputs excitation signals E _{R1 to R2} for the resolver 10. In the following equation, V _E is an amplitude voltage, ω ₀ is a frequency, and t is time.

In the state exemplified by such an excitation signal, the resolver 10 outputs a two-phase output signal corresponding to the rotation angle θ (t). Of the two-phase output signals, the difference E _S1 -S3 between the output signals S1 and S3 is expressed by the following equation. Further, of the two-phase output signals, the difference E _S2 -S4 between the output signals S2 and S4 is expressed by the following equation. In the following equation, K is a transformation ratio.

The differential amplifier DIF1 amplifies the difference between the first-phase output signals S1 and S3 from the resolver 10 and outputs the amplified signal ES1 _-S3 . The differential amplifier DIF2 amplifies the difference between the second-phase output signals S2 and S4 from the resolver 10 and outputs the amplified signal ES2 _-S4 .

The ROM 508 stores the digital values of the sin signal and the cos signal corresponding to an arbitrary angle φ (t), and the digital-analog converter DAC1 outputs the analog value of the sin signal corresponding to the angle φ (t). The digital-analog converter DAC2 outputs an analog value of the cos signal corresponding to the angle φ (t). Accordingly, the multipliers MUL1 and MUL2 output signals V1 and V2 as shown in the following equations, respectively.

Then, the adder ADD1 generates a signal V3 (= V1-V2) using the signals V1, V2 generated by the multipliers MUL1, MUL2. As a result, the adder ADD1 outputs a signal V3 as shown in the following equation. In the following formula, it is converted to "sinω ₀ t" to _{"-cos (ω 0 t + π /} 2) ".

Next, the signal V3 is subjected to synchronous detection using the multiplier MUL3. The synchronous detection generates a signal V4 obtained by multiplying the signal V3 by cos (ω ₀ t + π / 2) generated by the signal generation circuit 512. The signal V4 is expressed as follows:

The loop filter 502 outputs a signal V5 obtained by cutting the high frequency component of the signal V4. As a result, the signal V5 is expressed by the following equation as a result of the cos term being cut as a high frequency component in the above equation.

  Bipolar VCO 504 outputs a pulse signal having a frequency proportional to the absolute value of signal V5, which is an output signal of loop filter 502, and a polarity signal corresponding to the polarity of signal V5. The up / down counter 506 performs an up-count during the active period of the pulse signal when the polarity signal from the bipolar VCO 504 indicates a positive polarity, and the active period of the pulse signal when the polarity signal from the bipolar VCO 504 indicates a negative polarity. Count down. The count value of the up / down counter 506 is a digital value of the angle φ (t).

  As described above, the ROM 508 outputs the digital value of the sin signal and the digital value of the cos signal according to the angle φ (t). By utilizing the fact that the angle φ (t) changes in accordance with θ (t) in this way, the output processing circuit 510 uses a serial value in which the digital value (digital signal) of the angle φ (t) is synchronized with the serial clock SCK. Output as data or output as parallel data.

  As described above, based on the serial data or parallel data that is the output value of the R / D converter 500, the subsequent processing circuit can perform processing according to the rotation angle of the resolver 10.

  According to the present embodiment, since the resolver 10 and the R / D converter 500 are integrated, the two-phase output signal corresponding to the rotation angle θ of the resolver 10 greatly reduces the influence of noise and the like. can do. This eliminates the need for an additional circuit for impedance matching, which is conventionally required for an R / D converter that receives a signal from a resolver.

  Alternatively, since the impedance characteristic of the signal line for transmitting the signal from the resolver 10 can be known at the design stage of the rotation angle detection device 1 of the present embodiment, a matching circuit corresponding to this impedance characteristic can be built at low cost. Thus, it is possible to obtain a highly reliable rotation angle detection accuracy with high reliability.

  Note that the present invention is not limited to the configuration and processing contents of the R / D converter 500. The R / D converter according to the present invention only needs to convert a signal from the resolver 10 into a digital signal (digital value).

  Further, the planar shape of the substrate constituting the multilayer substrate in the present embodiment is not necessarily the shape shown in FIG. 9 or FIG. 10, and the present invention is not limited to the shape of the substrate constituting the multilayer substrate. .

  FIG. 12 is a plan view showing an example of another shape of the substrate of FIG. In FIG. 12, the same parts as those in FIG.

  As shown in FIG. 12, the substrate constituting the multilayer substrate in this embodiment does not need to have a protruding region in order to provide a mounting region for the R / D converter 500, and a gap between coil portions formed on the substrate. A mounting area for the R / D converter 500 may be provided in the area. In this case, it is desirable that the R / D converter 500 mounting area be provided in an area where the distance from the coil portion formed on the substrate is substantially equal. By doing so, the load of the signal line that electrically connects the R / D converter 500 and each coil portion becomes almost the same, so the design due to the difference in load becomes unnecessary and the reliability is improved. Thus, the detection accuracy can be easily improved.

  As mentioned above, although the rotation angle detection apparatus based on this invention was demonstrated based on said embodiment, this invention is not limited to this, It is possible to implement in the range which does not deviate from the summary, for example, The following modifications are also possible.

  (1) In the above-described embodiment, the resolver constituting the rotation angle detection device has been described as the one-phase excitation two-phase output type, but the present invention is not limited to this. The resolver constituting the rotation angle detection device in the above embodiment may be a signal having an excitation signal having a phase other than one phase, or an output signal having a phase other than two phases.

  (2) In the above-described embodiment, the resolver rotor constituting the rotation angle detecting device has been described as having a shaft angle multiplier of 4X, but the present invention is not limited to this. The axial multiplication angle of the rotor of the resolver in the above embodiment may be other than 4X such as 1X, 5X, and 7X.

  (3) In the resolver in the above embodiment, a sheet-like coil is described as an example of the winding member, but the present invention is not limited to this. For example, the winding member may be one in which a conductive layer is spirally formed on a support substrate, or may be formed by mounting a so-called sheet-like coil on a support substrate.

  (4) The resolver in the above embodiment sandwiches both sides of the rotor with the stator core, and the rotation of the rotor causes the area where the stator core and the rotor overlap in the top view to change, and the output signal changes according to the change in the area. However, the present invention is not limited to this. For example, the present invention can be applied to a resolver in which a gap between the rotor surface and the stator surface is changed by rotation of the rotor, and an output signal is changed in accordance with the change in the gap.

The functional block diagram of the structural example of the rotation angle detection apparatus in embodiment which concerns on this invention. The perspective view of the rotation angle detection apparatus in this embodiment. The top view of the rotation angle detection apparatus in this embodiment. The perspective view of the stator core in this embodiment. FIG. 5 is another perspective view of the stator core of FIG. 4. The figure which shows typically the AA sectional view taken on the line of FIG. Explanatory drawing of the exciting winding of the resolver in this embodiment. Explanatory drawing of the output winding of the resolver in this embodiment The top view of one board | substrate which comprises a multilayer board | substrate. Plan view of another substrate constituting the multilayer substrate The functional block diagram of the R / D converter in this embodiment. The top view which shows an example of another shape of the board | substrate of FIG. FIG. 13A shows the structure of a conventional resolver. FIG. 13B is a diagram showing an output voltage from a conventional resolver. FIG. 14A shows a structure of a conventional resolver. FIG.14 (b) is a figure shown in order to demonstrate the winding structure in each slot of the conventional resolver.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rotation angle detection apparatus, 10 ... Resolver, 100 ... Stator, 160 ... Rotor,
162a, 162b, 162c, 162d ... stator core,
172a, 172b, 172c, 172d ... coil part, 180 ... support substrate,
190a ... Lower stator plate, 192a, 198a ... Projection, 194a ... Winding magnetic core,
196a ... Upper stator plate, 200 ... Support, 410 ... Mounting area,
420, 430 ... shield region 500 ... R / D converter, 502 ... loop filter,
504 ... Bipolar VCO, 506 ... Up / down counter, 508 ... ROM,
510 ... Output processing circuit, 512 ... Signal generation circuit, ADD1 ... Adder,
DAC1, DAC2 ... digital-to-analog converter, DIF1, DIF2 ... differential amplifier,
MUL1, MUL2, MUL3 ... Multiplier

Claims (7)

A stator having a plurality of stator cores arranged at given intervals on a support substrate made of a non-magnetic material, each comprising a winding member;
A rotor provided rotatably with respect to the stator;
A converter that converts an output signal of the winding member that changes according to rotation of the rotor into a digital signal;
The converter is
A rotation angle detection device mounted on the support substrate. In claim 1,
The rotor is
A rotation angle detecting device having a shape in which the diameter of the outer contour line changes periodically. In claim 1 or 2,
The support substrate is
A rotation angle detection device characterized by having a substantially C-shape with a given angle range cut out in plan view. In any one of Claims 1 thru | or 3,
The support substrate is
A rotation angle detection device, wherein a shield region is provided at least at a part of a periphery of the mounting region of the converter. In any one of Claims 1 thru | or 4,
The support substrate is
A multilayer substrate in which a plurality of substrates each having a coil portion formed so that a spiral conductive layer is wound around a winding core of each stator core is laminated, and the coil portion of each layer is electrically connected through a through hole. Connected,
The rotation angle detecting device, wherein the converter is mounted on the uppermost substrate of the multilayer substrate. In claim 5,
Substrates other than the substrate on which the converter is mounted are as follows:
A rotation angle detecting device having a shield region corresponding to a mounting region of the converter. In any one of Claims 1 thru | or 6.
Each stator core constituting the plurality of stator cores,
An upper stator plate;
A lower stator plate,
The upper stator plate and the lower stator plate are connected, and a winding core around which the winding member consisting of an excitation winding and an output winding is wound is included.
The upper stator plate and the lower stator plate are
A rotation angle detection device characterized in that a part of the outer peripheral region of the rotor is sandwiched from both sides while leaving a magnetic gap.

Images