JP5518363B2 - Rotation angle detector - Google Patents

Description

  The present invention relates to, for example, a rotation angle detection device that is attached to a rotation shaft of a motor and detects a rotation angle of the rotation shaft using a change in permeance between a rotor and a stator.

Conventionally, a rotor attached to a rotating shaft of a motor, a stator core provided around the rotor and having a plurality of teeth whose tip portions are directed to the rotor, and an insulating insulating member on the teeth There has been known a rotation angle detection device including an excitation winding provided in the form of an output winding provided in a tooth with a bobbin together with the excitation winding (see, for example, Patent Document 1).
In this case, by applying an AC voltage to the excitation winding, a current flows through the excitation winding, and a magnetic flux passing through the rotor and the teeth is generated. From the change in permeance between the rotor and the teeth, The magnetic flux interlinking the output winding changes, and the output winding outputs a voltage corresponding to the rotation angle of the rotor.
Further, conventionally, in order to increase the value of the voltage output from the output winding and reduce the error included in the value of the voltage output from the output winding, the tip of the teeth is arranged along the circumferential direction of the rotor. A rotation angle detection device formed to extend is known.

Japanese Patent Laid-Open No. 2002-168652

However, in this case, since the tips of the teeth extend in both directions along the circumferential direction of the rotor, the conducting wires of the excitation winding and the output winding are wound around the insulating member in advance, and then the teeth are insulated. The excitation winding and output winding cannot be attached together with the member.
Therefore, the winding of the exciting winding 4 and the conducting wire of the output winding 5 must be wound around each tooth 2b by using a winding machine (not shown), and the conducting wire of the output winding is on the tip end side of the tooth. In some cases, the lead wires of the output winding are biased toward the base end side of the teeth.
As a result, if the output winding conductor is biased and wound toward the tip of the teeth, or the output winding conductor is biased and wound toward the base end of the teeth, the detection accuracy There was a problem that would decrease.

  This invention is suitable for detection accuracy when the output winding conductor is biased and wound around the tip end of the tooth, or when the output winding conductor is biased and wound around the base end of the tooth. It is intended to provide a rotation angle detection device that can suppress the decrease of the rotation.

A rotation angle detection device according to the present invention is provided with a rotor and a plurality of ring-shaped base portions and a base portion that are integrally formed with the base portion and spaced apart radially outward from the rotor. A stator core having teeth, an excitation winding provided on the teeth via an insulating member, and a conductive wire wound by concentrated winding, and provided on the teeth, and the conductive wire wound by concentrated winding . An output winding configured to output a change in magnetic flux generated by the excitation winding as a voltage, and a tip end portion of the teeth extends along a circumferential direction of the rotor, and the excitation winding The number of windings of the conducting wire on the tip end side of the teeth is larger than the number of windings of the conducting wire on the base end side of the teeth, and the whole is provided on the tip end side of the teeth. Winding covers said excitation winding together with the teeth, the number of turns of the wire of the excitation winding state, and are less than half the number of turns of the wire of the output winding, said output winding line, that has a first output winding unit and the second output winding unit, each the different phases.

  According to the rotation angle detection device of the present invention, the excitation winding has an output winding because the number of windings of the conductor on the tip end side of the teeth is larger than the number of windings of the conductor on the base end side of the teeth. If the lead wire is biased and wound around the tip of the tooth, or the lead wire of the output winding is biased and wound around the base end of the tooth, the magnetic flux interlinked with the output winding It is possible to suppress variations and reduce the detection accuracy.

It is sectional drawing which shows the rotation angle detection apparatus which concerns on Embodiment 1 of this invention. It is the figure which showed the winding number of each conducting wire of the exciting winding of FIG. 1, a 1st output winding, and a 2nd output winding. It is sectional drawing which shows the principal part of the rotation angle detection apparatus of FIG. It is sectional drawing which shows the principal part of the conventional rotation angle detection apparatus. It is sectional drawing which shows the principal part of the rotation angle detection apparatus of FIG. It is sectional drawing which shows the state by which the conducting wire of the output coil | winding of FIG. 5 was biased and wound to the front-end | tip part side of teeth. It is sectional drawing which shows the state by which the conducting wire of the output coil | winding of FIG. 5 was biased and wound by the base end part side of the teeth. It is a figure which shows XY coordinate prescribed | regulated in order to calculate a flux linkage, and the point P and point P 'which are measurement points. It is a contour figure which shows the result of having calculated the magnetic flux linked to the coil of 1 turn in the rotation angle detection apparatus of FIG. It is sectional drawing which shows the principal part of the conventional rotation angle detection apparatus. It is sectional drawing which shows the state by which the conducting wire of the output winding of FIG. 10 was biased and wound to the front-end | tip part side of teeth. 10 is a cross-sectional view showing a state in which the conductive wire of the output winding is wound in a biased manner toward the proximal end side of the tooth. It is a contour figure which shows the result of having calculated the magnetic flux linked to the coil of 1 turn in the conventional rotation angle detection apparatus. It is a figure which shows the Lissajous waveform calculated from the 1st output winding and 2nd output winding of the rotation angle detection apparatus of FIG. It is a figure which shows the Lissajous waveform calculated from the 1st output winding and the 2nd output winding of the conventional rotation angle detection apparatus. It is the figure which compared the angle detection error by the rotation angle of the rotor in the rotation angle detection apparatus of FIG. 1, and the angle detection error by the rotation angle of the rotor in the conventional rotation angle detection apparatus. It is sectional drawing which shows the modification of the exciting winding of the rotation angle detection apparatus which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the principal part of the rotation angle detection apparatus which concerns on Embodiment 2 of this invention. It is the figure which showed the winding number of each conducting wire of the exciting winding of FIG. 18, a 1st output winding, and a 2nd output winding. It is sectional drawing which shows the principal part of the rotation angle detection apparatus which concerns on Embodiment 3 of this invention. It is an enlarged view which shows the principal part of the rotation angle detection apparatus of FIG. It is a top view which shows the rotation angle detection apparatus which concerns on Embodiment 4 of this invention. It is sectional drawing which shows the modification of the rotation angle detection apparatus which concerns on Embodiment 1 thru | or 4 of this invention. It is sectional drawing which shows the further modification of the rotation angle detection apparatus which concerns on Embodiment 1 thru | or 4 of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding members and parts will be described with the same reference numerals.

Embodiment 1 FIG.
FIG. 1 is a sectional view showing a rotation angle detection device according to this embodiment.
The rotation angle detection device according to this embodiment includes a rotor 1 and a stator core 2 provided to be spaced radially outward from the rotor 1.
The rotor 1 and the stator core 2 are made of a magnetic material.
The stator core 2 has a ring-shaped base portion 2a and eight teeth 2b whose tip portions are directed from the base portion 2a to the rotor 1.
A slot 2c is formed from the base 2a and the teeth 2b.
The teeth 2b are arranged at equal intervals along the circumferential direction of the rotor 1, that is, every 45 degrees with the central axis of the rotor 1 as the center.
An excitation winding 4 and an output winding 5 are attached to each tooth 2b via an insulating member 3.

The rotor 1 has two salient poles 1a, and when the rotor 1 rotates, the pulsation of permeance between the rotor 1 and the teeth 2b changes in a sine wave shape. .
A rotating shaft 6 of a motor is fitted at the center of the rotor 1, and the rotating shaft 6 rotates to rotate the rotor 1 in synchronization.

In the exciting winding 4, the number of windings of the conducting wire on the distal end side of the tooth 2b is larger than the number of windings of the conducting wire on the proximal end side of the tooth 2b.
The output winding 5 has a first output winding 7 and a second output winding 8 each having a different phase.
By applying an AC voltage to the excitation winding 4, a current flows through the excitation winding 4 to generate a magnetomotive force.
This magnetomotive force generates a magnetic flux that passes through the rotor 1 and the stator core 2, and this magnetic flux links the output winding 5, thereby generating a voltage in the output winding 5.
Since the permeance between the rotor 1 and the teeth 2b changes in a sine wave shape depending on the rotation angle of the rotor 1, it is output from the first output winding 7 and the second output winding 8. The rotation angle of the rotor 1 can be detected by measuring the voltage.

FIG. 2 is a diagram showing the number of turns of each conducting wire of the excitation winding 4, the first output winding 7 and the second output winding 8 of FIG.
The tooth number in the figure is a number assigned for convenience to each tooth 2b in FIG. 1, and the number below each tooth number is the number of turns of the conductor wound around the tooth 2b.
A positive number and a negative number in the number of windings mean that the winding directions are different from each other.
The conducting wire of the excitation winding 4 is wound 50 times around all the teeth 2b so that the winding direction is reversed for each adjacent tooth 2b.
The conducting wire of the first output winding 7 (COS winding) is wound 200 times on each of the teeth 2b with the tooth numbers 1, 3, 5, and 7 so as to straddle the adjacent teeth 2b.
In addition, the conducting wire of the 1st output coil | winding 7 wound around each teeth 2b with the teeth number 1 and 5 is the same as the winding direction of the conducting wire of the excitation winding 4 wound around the teeth 2b with the tooth number 1 The conductive wire of the first output winding 7 wound around each of the teeth 2b with the teeth numbers 3 and 7 is wound around the first output winding wound around each of the teeth 2b with the teeth numbers 1 and 5. The wire 7 is wound in a direction opposite to the winding direction of the conducting wire.

On the other hand, the conductive wire of the second output winding 8 (SIN winding) straddles the teeth 2b around which the first output winding 7 is wound, and the teeth with the tooth numbers 2, 4, 6, 8 are used. It is wound 200 times on 2b.
In addition, the conducting wire of the 2nd output winding 8 wound around each teeth 2b of the teeth number 2 and 6 is the same as the winding direction of the conducting wire of the excitation winding 4 wound around the teeth 2b of the teeth number 1 The second output winding 8 is wound around each of the teeth 2b whose teeth numbers are 4 and 8, and the second output winding is wound around each of the teeth 2b whose teeth numbers are 2 and 6. The wire 8 is wound in a direction opposite to the winding direction of the conducting wire.

  Each excitation winding 4 is electrically connected to be in series with each other, each first output winding 7 is also electrically connected to be in series with each other, and each second output winding is further connected. 8 are also electrically connected so as to be in series with each other.

FIG. 3 is a cross-sectional view showing a main part of the rotation angle detection device of FIG.
The tip end portion of the tooth 2b in the rotation angle detection device according to this embodiment extends in both directions along the circumferential direction of the rotor 1.
As a result, the magnetic flux passing between the rotor 1 and the teeth 2b efficiently passes through the stator core 2 as compared with the conventional rotation angle detection device as shown in FIG. The magnetic flux linked to the winding 7 is increased, and the value of the voltage output from the first output winding 7 can be increased.
In FIG. 3, only the tooth 2 b having the tooth number 1 is shown, but the tip of the tooth 2 b extends in both directions along the circumferential direction of the rotor 1 in the same manner for the other teeth 2 b. ing.
Therefore, the value of the voltage output from the second output winding 8 can be increased in the same manner.

However, in the rotation angle detection device according to this embodiment, since the tip end portion of the tooth 2b extends in both directions along the circumferential direction of the rotor 1, the conducting wires of the excitation winding 4 and the output winding 5 are insulated in advance. After winding around the member 3, the excitation winding 4 and the output winding 5 cannot be attached to each tooth 2 b together with the insulating member 3.
Therefore, it is necessary to wind the conducting wire of the excitation winding 4 and the conducting wire of the output winding 5 around each tooth 2b by using a winding machine (not shown).
In the case of using a winding machine, as shown in FIG. 5, the output is adjusted so that the combined thickness of the excitation winding 4 and the output winding 5 is uniform from the base end portion to the tip end portion of the tooth 2b. Even if the conducting wire of the winding 5 is wound around the tooth 2b, as shown in FIG. 6, the conducting wire of the output winding 5 may be biased and wound around the tip end side of the tooth 2b, as shown in FIG. The conducting wire of the output winding 5 may be biased and wound toward the base end side of the tooth 2b.
Therefore, even if the position of the output winding 5 with respect to the tooth 2b is shifted, in order to prevent the value of the voltage output from the output winding 5 from changing, the position of the output winding 5 with respect to the tooth 2b. Even in the case of deviation, it is necessary to suppress a change in magnetic flux linked to the output winding 5.

Therefore, in the rotation angle detection device according to this embodiment, the excitation winding 4 is configured such that the number of windings of the conducting wire on the distal end side of the tooth 2b is greater than the number of windings of the conducting wire on the proximal end side of the tooth 2b. The conductor is wound.
Thereby, even if it is a case where the position of the output winding 5 with respect to the teeth 2b has shifted | deviated, the change of the magnetic flux linked to the output winding 5 can be suppressed.
The conducting wire of the first output winding 7 is wound around the outside in the radial direction of the excitation winding 4 and the outside of the excitation winding 4 along the radial direction of the rotor 1.
The conducting wire of the second output winding 8 is also wound around the outside of the excitation winding 4 in the radial direction and the outside of the excitation winding 4 along the radial direction of the rotor 1.
That is, the conductive wires of the first output winding 7 and the second output winding 8 are formed by winding the conductive wire of the exciting winding 4 around the tooth 2b and then covering the exciting winding 4 together with the tooth 2b. It is wound around.

Actually, the inventor of the present application calculated the magnetic flux interlinking with the coil provided around the tooth 2b in the rotation angle detection device according to this embodiment.
FIG. 8 is a diagram showing the XY coordinates defined for calculating the flux linkage and the points P and P ′ that are measurement points.
In the region where the conductor of the output winding 5 is wound, the point closest to the tooth 2b and closest to the tooth 2b is the origin of the XY coordinates, and the point P (X, Y) and P ′ FIG. 9 shows the calculated result of calculating the magnetic flux interlinking with the one-turn coil passing through the point (−X, Y).
In order to compare the calculation results, as shown in FIG. 10, FIG. 11 and FIG. 12, the conducting wire of the excitation winding 4 was uniformly wound around the tooth 2b from the proximal end portion to the distal end portion of the tooth 2b. The linkage magnetic flux is similarly calculated for the conventional rotation angle detection device, and the calculated result is shown in FIG.
Compared with FIG. 13, it can be seen that the flux linkage shown in FIG. 9 has a small change in flux linkage in the Y-axis direction.
That is, even when the output winding 5 is displaced in the Y-axis direction, the change in the voltage output by the output winding 5 is reduced, and the error included in the voltage output by the output winding 5 is reduced. The
Moreover, it can be seen that the flux linkage shown in FIGS. 9 and 13 has a small change in flux linkage in the X-axis direction.
Therefore, even when the output winding 5 is displaced in the X-axis direction, the change in the voltage output by the output winding 5 is reduced, and the error included in the voltage output by the output winding 5 is reduced. The

In fact, the inventor of the present application created a Lissajous waveform using the voltage values measured from the first output winding 7 and the second output winding 8 of the rotation angle detection device according to this embodiment. .
The Lissajous waveform refers to the amplitude of the voltage of the first output winding 7 (changing the sign when the phase is inverted) and the amplitude of the voltage of the second output winding 8 (changing the sign when the phase is inverted). Are plotted while rotating the rotation angle of the rotor 1 from 0 degree to 360 degrees.
FIG. 14 is a diagram showing a Lissajous waveform calculated from the first output winding 7 and the second output winding 8 of the rotation angle detection device according to this embodiment.
In FIG. 14, the Lissajous waveform indicated by the solid line is a case where the output winding 5 is an ideal aligned winding, as shown in FIG. 5, and the Lissajous waveform indicated by the broken line is one tooth 2b. As shown in FIG. 6, the lead wire of the output winding 5 is wound in a biased manner toward the tip end portion of the tooth 2 b, and the Lissajous waveform indicated by the dotted line is provided in one tooth 2 b. This is a case where the conductive wire of the output winding 5 is biased and wound toward the base end side of the tooth 2b as shown in FIG.
In order to compare the calculation results, the first output winding of the conventional rotation angle detection device in which the conducting wire of the excitation winding 4 is uniformly wound around the tooth 2b from the base end portion to the tip end portion of the tooth 2b. A Lissajous waveform was created using the voltage values measured from 7 and the second output winding 8.
FIG. 15 is a diagram showing a Lissajous waveform calculated from the first output winding 7 and the second output winding 8 of this conventional rotation angle detection device.
In FIG. 15, the Lissajous waveform indicated by a solid line is a case where the output winding 5 is an ideal aligned winding, as shown in FIG. 10, and the Lissajous waveform indicated by a broken line is one tooth 2b. As shown in FIG. 11, the lead wire of the output winding 5 provided in the case where the output winding 5 is wound in a biased manner toward the tip end side of the tooth 2b. The Lissajous waveform indicated by the dotted line is 1 As shown in FIG. 12, the conductive wire of the output winding 5 provided in one tooth 2b is the case where the output winding 5 is wound in a biased manner toward the base end side of the tooth 2b.
In each of FIGS. 14 and 15, the output winding 5 is normalized by the voltage amplitude when it is an ideal aligned winding.
Compared to FIG. 15, it can be seen that the Lissajous waveform shown in FIG. 14 has a reduced amount of center shift due to the shift of the output winding 5.

This center shift of the Lissajous waveform causes an angle detection error.
FIG. 16 shows an angle detection error due to the rotation angle of the rotor 1 in the rotation angle detection device according to this embodiment, and the conductive wire of the excitation winding 4 extends around the tooth 2b from the proximal end portion to the distal end portion of the tooth 2b. It is the figure which compared with the angle detection error by the rotation angle of the rotor 1 in the conventional rotation angle detection apparatus wound uniformly by.
In FIG. 16, the waveform of the detection error indicated by the broken line shows that the conducting wire of the output winding 5 provided in one tooth 2b is biased toward the tip end side of the tooth 2b as shown in FIG. This is a case where the conductor of the output winding 5 provided on the teeth 2b is an ideal aligned winding as shown in FIG.
Further, in FIG. 16, the waveform of the detection error indicated by the solid line is such that the conductor of the output winding 5 provided on one tooth 2b is biased toward the tip of the tooth 2b as shown in FIG. This is a case where the conductors of the output winding 5 provided on the other teeth 2b are ideally aligned windings as shown in FIG.
Compared with the conventional rotation angle detection device in which the conducting wire of the excitation winding 4 is uniformly wound around the tooth 2b from the base end portion to the tip end portion of the tooth 2b, the rotation angle detection device according to this embodiment It can be seen that the rotation angle detection error is greatly reduced.

As described above, according to the rotation angle detection device according to this embodiment, the tip of the tooth 2 b extends along the circumferential direction of the rotor 1, so that the magnetic flux interlinking with the output winding 5. Thus, the value of the voltage output from the output winding 5 can be increased without increasing the value of the current flowing through the excitation winding 4. As a result, errors included in the voltage output from the output winding 5 can be reduced.
Further, in the exciting winding 4, the number of windings of the conducting wire on the distal end side of the tooth 2b is larger than the number of windings of the conducting wire on the proximal end side of the tooth 2b. When the winding is biased toward the end portion, the variation in magnetic flux interlinked with the output winding 5 is suppressed, the error included in the voltage output by the output winding 5 can be reduced, and the detection accuracy is improved. It can suppress that it falls.
In addition, when the output winding 5 is biased toward the distal end side or the proximal end side of the tooth 2b, variation in magnetic flux interlinking with the output winding 5 is suppressed. When manufactured, it is possible to reduce variations in detection accuracy for each rotation angle detection device.
In the slot 2c, it is desirable that the conductors of all the excitation windings 4 are wound in a range within 1/2 of the radial length of the teeth 2b from the inner diameter side of the stator core 2.
By adopting such a configuration, the variation in magnetic flux distribution in the slot 2c is further reduced, so that the variation in output voltage is small even if the position of the output winding 5 varies, resulting in a decrease in detection accuracy. There is an effect that it can be further suppressed.

Further, since the number of turns of the conducting wire of the excitation winding 4 is smaller than the number of turns of the conducting wire of the output winding 5, when the conducting wire of the output winding 5 is wound on the radially outer side of the exciting winding 4, the output winding It is possible to prevent the wire 5 from being collapsed.
For example, the number of turns of the output winding 5 is preferably ½ or less.
3 and 7, the excitation winding 4 is 1/5 of the output winding 5.

In addition, as shown in FIG. 17, the whole excitation winding 4 may be provided in the front-end | tip part side of the teeth 2b.
As a result, even when the output winding 5 is wound in a biased manner toward the distal end side or the proximal end side of the tooth 2b, the error included in the voltage output by the output winding 5 can be further reduced. it can.

In this embodiment, the rotation angle detecting device having the excitation winding 4 having one phase and the output winding 5 having two phases has been described, but the present invention is not limited to this.
Even if the exciting winding 4 has two or more phases, if the conducting wire of the exciting winding 4 is arranged so as to be biased toward the tip end side of the tooth 2b, the output winding 5 has one phase, or 3 Needless to say, even if the phase is greater than or equal to the phase, the effect that the variation of the linkage magnetic flux with respect to the position of the output winding 5 in the slot 2c is small and the detection accuracy can be prevented from being lowered can be obtained. .

Embodiment 2. FIG.
FIG. 18 is a cross-sectional view showing a main part of the rotation angle detection device according to this embodiment.
In the rotation angle detecting device according to this embodiment, the conducting wire of the excitation winding 4 is wound around the tip end side of the tooth 2b, and further the conducting wire of the first output winding 7 and the second output winding 8 A conducting wire is wound around the same tooth 2b.
FIG. 19 is a diagram showing the number of turns of each conducting wire of the excitation winding 4, the first output winding 7 and the second output winding 8 of this rotation angle detection device.
As in the first embodiment, the conducting wire of the excitation winding 4 is wound around all the teeth 2b 50 times so that the winding direction is opposite for each adjacent tooth 2b.
The conducting wire of the first output winding 7 (COS winding) is wound around all the teeth 2b except for the teeth numbers 3 and 8, and the conducting wire of the second output winding 8 (SIN winding) is All the teeth 2b are wound around.
As described above, even if the conductive wire of the first output winding 7 and the conductive wire of the second output winding 8 are wound around the same tooth 2b, the conductive wire of the excitation winding 4 is connected to the tooth. As in the first embodiment, the first output winding 7 and the second output winding 8 are biased toward the distal end side or the proximal end side of the tooth 2b by being wound around the distal end side of the 2b. Even in such a case, an error in the angle detected by the rotation angle detection device can be reduced.
Further, the conductive wires of the first output winding 7 and the second output winding 8 have teeth numbers 3 and 8 so that the relative positions of the teeth 2b are alternately switched for each adjacent tooth 2b. If the configuration is wound around the teeth 2b excluding the first output winding 7 and the second winding, even if there is a change in the flux linkage due to the difference in position along the direction away from the teeth 2b. Since the voltage imbalance generated in the output winding 8 can be reduced, the accuracy of the detected angle can be improved.
Other configurations are the same as those in the first embodiment.

According to the rotation angle detection device according to this embodiment, the relative positions of the first output winding 7 and the second output winding 8 in each tooth 2b are alternately switched for each adjacent tooth 2b. Therefore, the voltage imbalance generated in the first output winding 7 and the second output winding 8 can be further reduced, and the accuracy of the detected rotation angle can be further improved.
Further, as described in the first embodiment, when the excitation winding 4 is provided so as to be biased toward the inner diameter side of the stator core 2, the number of turns of the excitation winding 4 is greater than the number of turns of the output winding 5. In many cases, since many exciting windings 4 exist on the inner diameter side of the stator core 2 in the slot 2c, it is difficult to align the output winding 5 from above.
At this time, collapse of the output winding 5 occurs, the voltage variation of the output winding 5 becomes large, and the error of the detected rotation angle increases as a result.
Therefore, it is desirable that the number of turns of the excitation winding 4 is smaller than the number of turns of the output winding 5.
For example, the number of turns of the excitation winding 4 is preferably ½ or less of the number of turns of the output winding 5.
However, unlike the one described in the first embodiment, the number of turns of the first output winding 7 (COS winding) and the second output winding 8 (SIN winding) wound around the same tooth 2b is different. The total is compared with the number of excitation windings 4 wound around the tooth 2b.
For example, in the example shown in FIG. 19, the number of turns of the first output winding 7 (COS winding) and the second output winding 8 (SIN winding) (the winding direction is not taken into consideration and is an absolute value). Is approximately ¼ or less of the number of turns of the excitation winding 4.
According to the above configuration, since the number of turns of the excitation winding 4 is smaller than that of the output winding 5, the occurrence of winding collapse is suppressed during the winding work of the output winding 5. This has the effect of improving the accuracy of the angle.

Embodiment 3 FIG.
20 is a cross-sectional view showing the main part of the rotation angle detection device according to this embodiment, and FIG. 21 is an enlarged view showing the main part of the rotation angle detection device of FIG.
In the rotation angle detection device according to this embodiment, the insulating member 3 is formed with a recess 3a that accommodates the entire excitation winding 4 provided to be biased toward the tip end side of the tooth 2b.
In addition, even if the excitation winding 4 is not entirely accommodated in the recessed part 3a, at least one part should just be accommodated in the recessed part 3a.
Other configurations are the same as those in the first embodiment.
As in the second embodiment, the conductive wires of the first output winding 7 and the second output winding 8 may be wound around the same tooth 2b.

According to the rotation angle detecting device according to this embodiment, the insulating member 3 is formed with the recess 3a that accommodates the excitation winding 4, so that the output winding 5 is disposed radially outside the excitation winding 4. When winding a conducting wire, it is possible to suppress the occurrence of collapse of the output winding 5.
Further, by accommodating the excitation winding 4 in the recess 3a, it is possible to suppress variations in the position of the excitation winding 4 that occurs for each tooth 2b or for each rotation angle detection device, so that the detection accuracy can be improved. it can.

  Further, since the entire excitation winding 4 is accommodated in the recess 3a, the winding of the output winding 5 is not collapsed when the conductor of the output winding 5 is wound outside the excitation winding 4 in the radial direction. Generation | occurrence | production can further be suppressed.

Embodiment 4 FIG.
FIG. 22 is a plan view showing a rotation angle detection device according to this embodiment.
In the rotation angle detection device according to this embodiment, the insulating member 3 electrically insulates the excitation winding 4 and the output winding 5 provided radially outside the rotor 1 from the excitation winding 4. It has an insulating wall 3b.
The position of the insulating wall 3b may be changed according to the position where the conducting wire of the excitation winding 4 is wound.
Further, in FIG. 22, the conducting wires of the excitation winding 4 and the output winding 5 are wound only on one tooth 2b, but each conducting wire is also wound on the other teeth 2b.
The stator core 2 has a pair of ear portions 2d for fixing to the motor via screws outside the base portion 2a.
An insulating member 9 that electrically insulates the stator core 2 from the excitation winding 4 and the output winding 5 is provided around the stator core 2.
The insulating member 9 is provided with a connector 11 having terminals 10 for electrically connecting the excitation winding 4 and the output winding 5 to the outside.
Other configurations are the same as those in the first embodiment.
As in the second embodiment, the conductive wires of the first output winding 7 and the second output winding 8 may be wound around the same tooth 2b.
Moreover, it is not necessary to wind the conductive wires of the excitation winding 4 and the output winding 5 around all the teeth 2b, and the conductive wires of the excitation winding 4 and the output winding 5 are connected to the predetermined teeth 2b according to the specifications. It may be wound.

  According to the rotation angle detection device according to this embodiment, the insulating member 3 electrically connects the excitation winding 4 and the output winding 5 provided radially outside the rotor 1 from the excitation winding 4. Since the insulating wall 3b is insulated, electrical insulation between the excitation winding 4 and the output winding 5 can be improved.

In each of the above embodiments, the number of teeth 2b is eight, the number of salient poles 1a of the rotor 1 is two, or the number of teeth 2b is ten, or the number of teeth 2b is ten. Although the rotation angle detection device having two poles 1a has been described, the present invention is not limited to this.
For example, as shown in FIG. 23, a rotation angle detecting device having a shaft double angle 5X in which the number of teeth 2b is 8 and the number of salient poles 1a of the rotor 1 is 5, or as shown in FIG. A rotation angle detecting device having a shaft angle multiplier of 7X in which the number of 2b is eight and the number of salient poles 1a of the rotor 1 is seven may be used.
Further, although not shown, the number of teeth 2b may be ten, and a rotation angle detecting device such as a shaft double angle 2X, 3X, 4X, 8X, etc. may be used, and any number of teeth 2b and rotation of any shaft double angle may be used. It can be applied to an angle detection device.

  1 Rotor, 1a Salient pole, 2 Stator core, 2a Base, 2b Teeth, 2c Slot, 2d Ear, 3 Insulating member, 3a Concave, 4 Excitation winding, 5 Output winding, 6 Rotating shaft, 7 First Output winding, 8 second output winding, 9 insulating member, 10 terminal, 11 connector.

Claims (4)

A rotor,
A stator core provided with a plurality of teeth, which are provided radially apart from the rotor, are formed integrally with the ring-shaped base portion and the base portion, and tip portions thereof are directed to the rotor;
An excitation winding provided on the teeth via an insulating member, and a conductive wire wound by concentrated winding ; and
Provided in the teeth, the conductive wire is wound by concentrated winding, and includes an output winding that outputs a change in magnetic flux generated by the excitation winding as a voltage,
The tip of the teeth extends along the circumferential direction of the rotor,
In the exciting winding, the number of turns of the conducting wire on the tip end side of the teeth is larger than the number of windings of the conducting wire on the base end side of the teeth, and the whole is provided on the tip end side of the teeth. And
The output winding covers the excitation winding together with the teeth,
Number of turns of the wire of the excitation winding state, and are less than half the number of turns of the wire of the output winding,
The output windings, respectively a rotational angle detecting apparatus according to claim Rukoto has had a first output winding unit and the second output winding unit comprising different phases.   2. The first output winding portion and the second output winding portion are configured such that the relative positions of the teeth are alternately switched for each adjacent tooth. Rotation angle detection device.   The rotation angle detecting device according to claim 1 or 2, wherein the insulating member is formed with a recess for accommodating the exciting winding.   The rotation angle detection device according to claim 3, wherein the entire excitation winding is accommodated in the recess.

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