JP2011064710A - Variable reluctance-type angle detector - Google Patents

Abstract

A variable reluctance angle detector is provided that can reduce the resistance of an excitation winding, increase the excitation current without increasing the excitation power supply voltage, and reduce the influence of noise.
An excitation coil and a magnetic flux density excited by a power source, having a plurality of teeth 2 formed inwardly and spaced apart from each other in the circumferential direction and formed by winding a conductive wire around each of the teeth 2. Rotation composed of a stator 3 having an a-phase output coil 6 (a is an integer) that outputs a change in voltage and an iron core having a shape in which the gap permeance between the stator 3 changes sinusoidally. The exciting coil 5 is formed by winding a conducting wire having a larger wire diameter than the output coil 6.
[Selection] Figure 14

Description

  The present invention relates to a variable reluctance type angle detector that detects a rotation angle of a motor or the like.

In the conventional variable reluctance type angle detector, the gap permeance between the stator having the excitation winding and the n-phase output winding in the slot and the stator changes in a sinusoidal shape with respect to the angle θ. And an iron core that is shaped to
Here, all the exciting coils wound with the winding direction of the conducting wire turned forward and reverse in each slot so that the number of excitation winding poles and the number of stator teeth (slots) are the same are connected in series. An exciting winding is formed in connection with
In addition, an output coil is formed by connecting in series an output coil around which a conducting wire is wound so that an induced voltage distribution generated in the output coil for one phase is a sine wave distribution.

When a sine wave voltage is applied to the excitation coil having the above configuration, a sine wave current flows through the excitation coil, thereby generating a magnetic flux in the teeth.
Here, the gap permeance between the teeth of the stator and the rotor determines the magnetic flux density of each tooth, and the output winding has an output voltage as a composite value of the magnetic flux linked to the output coil wound around each tooth. appear.
When the rotational position of the rotor changes, the gap permeance changes, so that the output voltage amplitude changes. Therefore, the angle of the rotor can be obtained from this output voltage amplitude (see, for example, Patent Document 1).

Japanese Patent No. 3182493

In a conventional variable reluctance type angle detector, for example, when a variable reluctance type angle detector is attached to an electric motor driven by an inverter, noise due to switching of the inverter is induced in the output winding of the variable reluctance type angle detector. There is a problem that the rotational angle detection accuracy is lowered.
In order to reduce noise, it is conceivable to increase the number of excitation amperes and increase the signal component of the output winding. However, since the power supply is shared with other equipment, the excitation power supply voltage is limited and free. However, there is a problem that the number of excitation amperes cannot be increased.
Further, even if the excitation current can be increased, there is a problem that the current density of the excitation coil increases and the excitation coil may be overheated.

  An object of the present invention is to solve the above-described problems. The object of the present invention is to increase the excitation current without increasing the excitation power supply voltage by reducing the resistance of the excitation winding, thereby reducing the noise. It is an object of the present invention to provide a variable reluctance type angle detector capable of reducing the influence of the above.

  The variable reluctance type angle detector according to the present invention has a plurality of teeth formed inward and spaced apart from each other in the circumferential direction, and is excited by a power source formed by winding a conductive wire around each of the teeth. A stator having an a coil (a is an integer) that outputs a change in magnetic flux density as an excitation coil and an iron core having a shape in which the gap permeance between the stator changes in a sine wave shape. The excitation coil is formed by winding a conducting wire having a larger diameter than the output coil.

According to the rotation angle detecting device of the present invention, the exciting coil is formed by winding a conducting wire having a larger diameter than the output coil, and the exciting winding is reduced without increasing the exciting power supply voltage by reducing the resistance of the exciting winding. Since the entire exciting current can be increased, a variable reluctance type angle detector with reduced detection and good detection accuracy can be obtained.
Further, since the current flowing through each excitation coil does not change, it is possible to prevent the excitation winding from overheating.

1 is a structural diagram of a variable reluctance type angle detector according to Embodiment 1 of the present invention. It is a connection diagram which shows the connection state of the coil shown in FIG. It is explanatory drawing which shows the winding number of the conducting wire of the exciting coil and output coil which were shown in FIG. It is a block diagram of the variable reluctance type angle detector which concerns on Embodiment 2 of this invention. It is a connection diagram which shows the connection state of the coil shown in FIG. It is explanatory drawing which shows the winding number of the conducting wire of the exciting coil shown in FIG. 4, and an output coil. It is another structure figure of the variable reluctance type | mold angle detector which concerns on Embodiment 2 of this invention. It is a connection diagram which shows the connection state of the coil shown in FIG. It is a block diagram of the variable reluctance type | mold angle detector which concerns on Embodiment 3 of this invention. FIG. 10 is a connection diagram illustrating a connection state of the coils illustrated in FIG. 9. It is explanatory drawing which shows the winding number of the conducting wire of the exciting coil and output coil which were shown in FIG. It is a connection diagram which shows the connection state of another coil of the variable reluctance type | mold angle detector which concerns on Embodiment 3 of this invention. It is explanatory drawing which shows the winding number of the conducting wire of an exciting coil and an output coil of the variable reluctance type angle detector shown in FIG. It is a connection diagram of the variable reluctance type angle detector which concerns on Embodiment 4 of this invention. It is a connection diagram which shows the connection state of the coil of the variable reluctance type | mold angle detector which concerns on Embodiment 5 of this invention. It is explanatory drawing which shows the winding number of the conducting wire of an exciting coil, an output coil, and a short circuit coil of the variable reluctance type angle detector shown in FIG. It is a connection diagram which shows the connection state of another coil of the variable reluctance type | mold angle detector which concerns on Embodiment 5 of this invention. It is explanatory drawing which shows the winding number of the conducting wire of an exciting coil, an output coil, and a short circuit coil of the variable reluctance type angle detector shown in FIG.

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 structural diagram of a variable reluctance angle detector according to Embodiment 1 of the present invention. Here, an example in which the number of teeth is 12 and the number of salient poles of the rotor is 4 is shown.
FIG. 2 is a connection diagram illustrating a connection state of the coils illustrated in FIG. 1. Here, the vertical direction of each coil is shown corresponding to the forward and reverse of the winding direction.

1 and 2, the variable reluctance type angle detector 1 has a gap permeance between the stator 3 having the teeth 2 arranged inward and in the circumferential direction, and a sine wave shape. And a rotor 4 formed of an iron core having a shape.
Further, an excitation coil 5 and an output coil 6 around which a conducting wire is wound are formed on the teeth 2 of the stator 3.
Each tooth 2 is formed with two exciting coils 5, and the conducting coils are wound so that the exciting coils 5 adjacent to each other in the circumferential direction have the same number of turns and the opposite winding directions.

Here, the number of the teeth 2 is represented as teeth 2 (1), 2 (2),...
Further, the j-th exciting coil 5 from the outside to the inside diameter side of the tooth 2 (i) is represented as a coil 5 (i, j).

The first exciting coil group 7 includes exciting coils 5 (1, 1), 5 (2, 1) formed on all the teeth 2 of the teeth 2 (1), 2 (2), ... 2 (12). ,... 5 (12, 1) are connected in series in the circumferential direction.
The second exciting coil group 8 is formed by connecting exciting coils 5 (1, 2), 5 (2, 2),... 5 (12, 2) in series in the circumferential direction.
Then, the winding start each other of the first exciting coil group 7 and the second excitation coil group 8 is connected, the winding end each other of the first exciting coil group 7 and the second excitation coil group 8 is connected, An exciting winding 9 is formed in which exciting coil groups are connected in parallel.
In the drawing, the excitation coils 5 (1, 1), 5 (2, 1),...

  As for the number of turns of the conductive wire of the output coil 6 forming the output winding 10, for example, in the case of two-phase output (s phase, c phase), the number of pole pairs, which is the spatial order of the magnetomotive force generated by the exciting coil 5, is M (Here, since the conductive wires are wound alternately around the 12 teeth 2, M = 6), and the number of salient poles of the rotor 4 is N, the teeth 2 (i of each phase) ) The number of turns ns (i) and nc (i) of the conducting wire can be expressed by the following equations (1) and (2).

Here, the output coil 6 forming the q-phase output winding 10 of the tooth 2 (p) is represented as an output coil 6 (p, q), and the q-phase output winding 10 is represented as an output winding 10 (q). To express.
The s-phase output winding 10 (s) includes output coils 6 (1,1), 6 (2,1),... 6 (12,1) formed in each tooth 2 in series in the circumferential direction. Connected and formed.
In addition, the c-phase output winding 10 (c) is configured so that the output coils 6 (1,1), 6 (2,1),... It is formed by connecting in series.
In the drawing, the output coils 6 (1, 1), 6 (2, 1),... 6 (12, 1) are not shown but are shown as the output coils 6.

An example of the number of turns of each of the exciting coil 5 and the output coil 6 forming the exciting winding 9 and the output winding 10 is shown in FIG.
In FIG. 3, when the number of turns is negative, it indicates that the winding direction is the reverse direction.

The operation of the variable reluctance angle detector 1 having the above configuration will be described below.
When a sine wave voltage is applied to the excitation winding 9, a sine wave current flows through the excitation winding 9. When a current flows through the excitation winding 9, a magnetic flux is generated in the teeth 2.
Here, the magnetic flux density of each tooth 2 is determined by the gap permeance between the teeth 2 of the stator 3 and the rotor 4, and the output winding 10 has a magnetic flux interlinked with the output coil 6 wound around each tooth 2. The output voltage appears as a composite value of.
When the rotational position of the rotor 4 changes, the gap permeance changes, so the output voltage amplitude changes. Therefore, the angle of the rotor 4 can be obtained from this output voltage amplitude.

Here, since the exciting winding 9 is formed by connecting the first exciting coil group 7 and the second exciting coil group 8 in parallel, it is more than when one exciting coil group is used as the exciting winding 9. Can also reduce the resistance.
Therefore, a large excitation current can be obtained with the same power supply voltage, and when the excitation current increases, the magnetomotive force for generating magnetic flux also increases, so the output voltage of the output winding 10 also increases.

According to the variable reluctance type angle detector 1 according to Embodiment 1 of the present invention, the exciting coil 9 is formed by connecting the first exciting coil group 7 and the second exciting coil group 8 in parallel. Thus, the resistance of the excitation winding 9 can be reduced.
Therefore, the output voltage of the output winding 10 can be increased without increasing the excitation power supply voltage. Since the output voltage increases, the influence of noise can be reduced.
Further, since the current flowing through each exciting coil 5 does not change, it is possible to prevent the exciting winding 9 from overheating.

  In the above description, the case where the output winding 10 has two phases has been described. Here, in the case where the output winding 10 has three phases, the number of turns of the conductive wire of each output coil 6 is set to u. When the phase, v phase, and w phase are designated, the number of turns ns (i) and nc (i) of the conductive wire wound around the teeth 2 (i) of each phase is expressed by the following equation (3) to the following equation (5): Can do.

  When the a-phase output winding 10 is provided, the number of turns of the conducting wire wound around the output coil 6 (i, j) is expressed by the following equation (6) when the phase number a is an even number. When it is an odd number, it can be expressed by the following equation (7).

Embodiment 2. FIG.
FIG. 4 is a structural diagram of the variable reluctance type angle detector 1 according to the second embodiment of the present invention. Here, an example in which the number of teeth 2 is 12 and the number of salient poles of the rotor 4 is 4 is shown.
FIG. 5 is a connection diagram illustrating a connection state of the coils illustrated in FIG. 4. Here, the vertical direction of each coil is shown corresponding to the forward and reverse of the winding direction.
4 and 5, each tooth 2 is formed with one exciting coil 5. Conductive wires are wound so that the exciting coils 5 adjacent to each other in the circumferential direction have the same number of turns and have opposite winding directions.

The first exciting coil group 7 is formed by connecting the exciting coils 5 formed in odd-numbered teeth 2 (1), 2 (3),... 2 (11) in series in the circumferential direction. .
The second exciting coil group 8 is formed by connecting the exciting coils 5 formed in even-numbered teeth 2 (2), 2 (4),... 2 (12) in series in the circumferential direction. ing.
Then, the winding start each other of the first exciting coil group 7 and the second excitation coil group 8 is connected, the winding end each other of the first exciting coil group 7 and the second excitation coil group 8 is connected, An exciting winding 9 is formed in which exciting coil groups are connected in parallel.
Since the output winding 10 is the same as that shown in the first embodiment, description thereof is omitted.

FIG. 6 shows an example of the number of windings of the exciting coil 5 and the output coil 6 that form the exciting winding 9 and the output winding 10.
Here, when the number of turns is negative, it indicates that the winding direction is the reverse direction, and a portion indicated only by − indicates that the exciting coil 5 is not formed on the tooth 2.

The operation of the variable reluctance angle detector 1 having the above configuration will be described below.
Since the excitation winding 9 is formed by connecting the first excitation coil group 7 and the second excitation coil group 8 in parallel, compared to when one excitation coil group is used as the excitation winding 9, The number of exciting coils 5 connected in series is halved, and the resistance can be reduced.
Therefore, a large excitation current can be obtained with the same power supply voltage, and when the excitation current increases, the magnetomotive force for generating magnetic flux also increases, so the output voltage of the output winding 10 also increases.
In addition, the excitation coils 5 constituting the first excitation coil group 7 and the second excitation coil group 8 are formed in different teeth 2, and the first excitation coil group 7 and the second excitation coil group 8 are Connected in parallel to form a loop.
Therefore, when a variation in magnetic flux or the like occurs in the radial direction of the excitation winding 9, a circulating current flows through the excitation winding 9 in a direction that cancels the variation in the magnetic flux.

According to the variable reluctance angle detector 1 according to the second embodiment of the present invention, the exciting coils 5 constituting the first exciting coil group 7 and the second exciting coil group 8 are formed on different teeth 2. The first exciting coil group 7 and the second exciting coil group 8 are connected in parallel to form a loop.
For this reason, a circulating current flows in the exciting winding 9 in a direction that cancels out the magnetic flux fluctuation, for example, against high-frequency magnetic flux fluctuation caused by switching of the inverter or the like that penetrates the exciting winding 9 in the radial direction. 10 can reduce the influence of this magnetic flux fluctuation interlinked with 10 and can detect the angle with high accuracy.

In the above description, the exciting coils 5 adjacent to each other in the circumferential direction are wound with the same number of turns and the winding direction is opposite, and the first exciting coil group 7 and the second exciting coil are wound. winding start each other coil group 8 is connected, it is connected winding end each other of the first exciting coil group 7 and the second excitation coil group 8, respectively, the excitation winding 9 group excitation coil is connected in parallel Forming.
However, the conducting wires of all the exciting coils 5 are wound in the same direction, the winding start of the first exciting coil group 7 and the winding end of the second exciting coil group 8 are connected, and the second exciting coil group 8 is connected. The excitation winding 9 in which the excitation coil group is connected in parallel may be formed by connecting the winding start of the coil and the winding end of the first excitation coil group 8.

FIG. 7 and FIG. 8 show a structural diagram of the variable reluctance type angle detector 1 and a connection diagram showing a connection state of each coil in this case.
The actual method for forming the exciting winding 9 will be specifically described below.
First, the conductive wire is wound 40 times around the teeth 2 (1). Next, a conducting wire is wound around the teeth 2 (3) 40 times. Similarly, the conductor is wound 40 times to every tooth 2 (11) every 40 teeth.
Then, this conducting wire is moved to the tooth 2 (2) as it is, and the conducting wire is wound 40 times around the tooth 2 (2) in the same direction. Next, the conducting wire is wound around the teeth 2 (4) 4 in the same direction 40 times. In the same manner, the conductor is wound 40 times at intervals of 2 teeth to 2 teeth (12).

  Even with the excitation winding 9 formed in this way, the same effect as in the present embodiment can be obtained. Furthermore, since the conducting wire of each exciting coil 5 can be made the same winding direction, workability can be improved.

Embodiment 3 FIG.
FIG. 9 is a structural diagram of the variable reluctance type angle detector 1 according to the third embodiment of the present invention. Here, an example in which the number of teeth 2 is 12 and the number of salient poles of the rotor 4 is 4 is shown.
FIG. 10 is a connection diagram illustrating a connection state of the coils illustrated in FIG. 9. Here, the vertical direction of each coil is shown corresponding to the forward and reverse of the winding direction.

9 and 10, the excitation winding 9 has the same configuration as that of the second embodiment, and a description thereof will be omitted.
The output winding 10 of each phase forms the output coil 6 having the same number of turns of the conductive wire as the output coil 6 shown in the second embodiment, and the odd number is similar to the connection of the excitation winding 9 described in the second embodiment. A first output coil group 11 in which output coils 6 formed on numbered teeth 2 are connected in series; a second output coil group 12 in which output coils 6 formed on even numbered teeth 2 are connected in series; Are connected in parallel to form the output winding 10.

Here, the s-phase output winding 10 will be described.
Here, the first output coil group 11 and the second output coil group 12 constituting the output winding 10 (q) are replaced with the first output coil group 11 (q) and the second output coil group 12 (q ).
The first output coil group 11 (1) is formed by connecting the output coils 6 formed in odd-numbered teeth 2 (1), 2 (3),... 2 (11) in series in the circumferential direction. Has been.
The second output coil group 12 (1) connects the output coils 6 formed in even-numbered teeth 2 (2), 2 (4),... 2 (12) in series in the circumferential direction. Is formed.
Then, the winding start each other of the first output coil group 11 (1) and the second output coil group 12 (1) is connected, a first output coil group 11 (1) and the second output coil group 12 ( 1) are connected to each other to form an output winding 10 in which output coil groups are connected in parallel.

An example of the number of windings of the exciting coil 5 and the output coil 6 forming the exciting winding 9 and the output winding 10 is shown in FIG.
Here, when the number of turns is negative, it indicates that the winding direction is the reverse direction. A portion where only-is displayed indicates that the exciting coil 5 or the output coil 6 is not formed on the tooth 2.

The operation of the variable reluctance angle detector 1 having the above configuration will be described below.
The output coils 6 constituting the first output coil group 11 (1) and the second output coil group 12 (1) are formed in different teeth 2, and the first output coil group 11 (1) and the first output coil group 11 (1) Two output coil groups 12 (1) are connected in parallel to form a loop.
Therefore, when a variation in magnetic flux occurs in the radial direction of the output winding 10, a circulating current flows through the output winding 10 in a direction that cancels the variation in magnetic flux.

According to the variable reluctance type angle detector 1 according to the third embodiment of the present invention, the output coils 6 constituting the first output coil group 11 and the second output coil group 12 are formed on different teeth 2. The first output coil group 11 and the second output coil group 12 are connected in parallel to form a loop.
For this reason, a circulating current flows through the output winding 10 in a direction that cancels the magnetic flux variation, for example, in response to high-frequency magnetic flux variation due to switching of the inverter or the like that penetrates the output winding 10 in the radial direction. 10 can reduce the influence of this magnetic flux fluctuation interlinked with 10 and can detect the angle with high accuracy.

  In the above description, each of the output coils 6 constituting the first output coil group 11 (1) includes those in which the winding directions are opposite to each other. Similarly to the above, the conductors of all the output coils 6 are wound in the same direction, and the winding start of the first output coil group 11 (1) and the winding end of the second output coil group 12 (1) are connected. And the winding start of the second output coil group 12 (1) and the winding end of the first output coil group 11 (1) are connected to form an output winding 10 in which the output coil groups are connected in parallel. May be.

A connection diagram showing the connection state of each coil of the variable reluctance type angle detector 1 in this case is shown in FIG. Here, the vertical direction of each coil is shown corresponding to the forward and reverse of the winding direction.
FIG. 13 shows an example of the number of turns of the conductive wires of the excitation coil 5 and the output coil 6 that form the excitation winding 9 and the output winding 10. Here, when the number of turns is negative, it indicates that the winding direction is the reverse direction. A portion where only-is displayed indicates that the exciting coil 5 or the output coil 6 is not formed on the tooth 2.

Even with the output winding 10 formed in this way, the same effect as in the present embodiment can be obtained.
Furthermore, since the conducting wire of each output coil 6 can be wound in the same direction, workability can be improved.

Embodiment 4 FIG.
FIG. 14 is a connection diagram showing a coil connection state of the variable reluctance type angle detector 1 according to the fourth embodiment of the present invention.
Here, the excitation winding 9 is formed by connecting in series each output coil 6 wound around each tooth 2 with a conductor larger than the wire diameter of the output winding 10.
The output winding 10 may be the same as that shown in the first embodiment.

Here, since the exciting winding 9 is formed of a conducting wire having a large wire diameter, the cross-sectional area becomes large and the resistance can be reduced.
Therefore, a large excitation current can be obtained with the same power supply voltage, and when the excitation current increases, the magnetomotive force for generating magnetic flux also increases, so the output voltage of the output winding 10 also increases.

According to the variable reluctance type angle detector 1 according to the fourth embodiment of the present invention, since the exciting winding 9 is formed of a conducting wire having a large wire diameter, the resistance is reduced. The output voltage can be increased.
Further, since the wire diameter of the output winding 10 is small, a sufficient winding space can be obtained.

Embodiment 5 FIG.
FIG. 15 is a connection diagram illustrating a connection state of coils of the variable reluctance type angle detector 1 according to the fifth embodiment of the present invention.
The exciting coils 5 adjacent to each other in the circumferential direction are wound with the same number of turns and the winding direction is reversed, and all the exciting coils 5 are connected in series to form the exciting winding 10. Yes.
Since the output winding 10 is the same as that of the first embodiment, description thereof is omitted.

Each tooth 2 is formed with a short-circuit coil 13 in which a conducting wire is wound in the same winding direction.
Here, the short-circuit coil 13 formed on the tooth 2 is connected to the short-circuit coil 13 and the short-circuit coil 13 formed on the tooth 2 that is symmetric about the axis of the rotor 4. Thus, six short-circuit windings 14 are formed.

Hereinafter, the r-th short-circuit winding 14 is represented as a short-circuit winding 14 (r), and a method for forming the short-circuit winding 14 (1) will be specifically described.
First, a conductive wire is wound around the tooth 2 (1) 10 times in the positive direction to form the short-circuit coil 13.
Subsequently, the conductor is moved as it is to the tooth 2 (7) that is symmetric with respect to the axial point of the rotor 4, and the conductor 2 is wound around the tooth 2 (7) in the reverse direction 10 times to short-circuit the coil 13. 14 is formed.
And the winding start and the winding end of conducting wire are connected, and the short circuit winding 14 (1) is formed.

The short-circuiting coil 14 (2) and the following are short-circuiting coils in which a conducting wire is wound around the teeth 2 in point-symmetrical positions so that the winding direction is opposite with the same number of turns, similarly to the short-circuiting winding 14 (1). 13 are connected to each other.
FIG. 16 shows an example of the number of turns of the conducting wires of the exciting coil 5, the output coil 6 and the shorting coil 13 that form the exciting winding 9, the output winding 10 and the shorting winding 14. Here, when the number of turns is negative, it indicates that the winding direction is the reverse direction. The location where only-is shown indicates that the short coil 13 is not formed on the tooth 2.

The operation of the variable reluctance angle detector 1 having the above configuration will be described below.
Here, the short circuit coil 13 formed in the tooth 2 (p) is represented as a short circuit coil 13 (p).
The short-circuit winding 14 (1) is wound so that the winding directions of the conducting wires of the short-circuit coil 13 (1) and the short-circuit coil 13 (7) are opposite to each other.
Therefore, when a current flows through the exciting winding 9, the exciting coil 5 (1, 1) is wound in the positive direction, and the exciting coil 5 (7, 1) is also wound in the positive direction. Therefore, the electromotive force is reversed between the short-circuit coil 13 (1) and the short-circuit coil 13 (7), and the short-circuit current does not flow.

  Here, when the air gap between the stator 3 and the rotor 4 becomes uneven, for example, the eccentricity of the stator 3 or the rotor 4 occurs, and the teeth 2 (1) and the rotor 4 are not aligned. When the air gap is reduced and the air gap between the teeth 2 (7) and the rotor 4 is increased, the same excitation current flows in the teeth 2 (1) and the teeth 2 (7). The magnetic flux density of teeth 2 (1) having a small air gap is increased.

As a result, the electromotive force of the short-circuit coil 13 (1) of the short-circuit winding 14 (1) becomes larger than the electromotive force of the short-circuit coil 13 (7) of the short-circuit winding 14 (1). Accordingly, a short-circuit current flows in the direction of canceling the magnetic flux of the tooth 2 (1) through the short-circuit coil 13 (1), and a short-circuit is generated in the direction of increasing the magnetic flux of the tooth 2 (7) through the short-circuit coil 13 (7). Current flows.
In addition, when a magnetic flux variation or the like occurs in the radial direction of the excitation winding 9, a circulating current flows through the short-circuit winding 14 connected in parallel in the direction to cancel the magnetic flux variation.
The same applies to the operations of the second short-circuit winding 14 to the sixth short-circuit winding 14.

According to the variable reluctance type angle detector 1 according to the fifth embodiment of the present invention, when there is a magnetic flux penetrating the teeth 2 in the radial direction, for example, a magnetic flux penetrating from the teeth 2 (1) to the teeth 2 (7). The directions of the electromotive forces of the short-circuit coil 13 (1) and the short-circuit coil 13 (7) coincide with each other, and a short-circuit current flows in the short-circuit coil 13 in a direction to reduce the magnetic flux.
Therefore, since the influence of noise on the output coil 6 can be reduced by weakening this magnetic flux, highly accurate angle detection can be performed.

In this embodiment, the short-circuit winding 14 is formed by connecting the short-circuit coils 13 of the teeth 2 at positions facing each other, but other connection methods may be used.
A connection diagram showing the connection state of the other short-circuit coil 13 is shown in FIG.
FIG. 18 shows an example of the number of turns of the conductive wires of the exciting coil 5, the output coil 6 and the short-circuiting coil 13 that form the exciting winding 9, the output winding 10 and the short-circuiting winding 14, respectively.
The short-circuiting coil 13 formed in this way is more workable than the one in which six short-circuiting windings 14 are formed because the number of connections of the short-circuiting windings 14 is reduced.

In addition, about the winding number of the conducting wire of the exciting winding 9, the signal winding, and the short circuit winding 14, and the winding direction, the example is shown and it is not limited to what was shown in the said Example.
In the above description, the rotor 4 is described as being inside the stator 3. However, the stator 3 having the teeth 2 may be inside and the rotor 4 may be outside.

  1 Variable reluctance type angle detector, 2 teeth, 3 stators, 4 rotors, 5 excitation coils, 6 output coils, 7 excitation coil groups, 8 excitation coil groups, 9 excitation windings, 10 output windings, 11 output coils Group, 12 output coil group, 13 short coil, 14 short coil.

Claims (1)

A plurality of teeth formed inwardly and circumferentially spaced apart from each other, and each of the teeth is wound with a conductive wire, and the excitation coil excited by the power source and the change in magnetic flux density are output as voltage. A stator having an output coil for a phase (a is an integer);
A rotor composed of an iron core having a shape in which a gap permeance with the stator changes in a sine wave shape, and
The variable reluctance type angle detector, wherein the exciting coil is formed by winding a conducting wire having a larger diameter than the output coil.

Images