WO2001042743A1

WO2001042743A1 - Variable reluctance type angle detector

Info

Publication number: WO2001042743A1
Application number: PCT/JP2000/003989
Authority: WO
Inventors: Yuji Maruyama; Takao Kano; Makoto Naruse
Original assignee: Sumtak Corporation
Priority date: 1999-12-07
Filing date: 2000-06-19
Publication date: 2001-06-14
Also published as: JP3429464B2; JP2001165706A

Abstract

The variable reluctance type angle detector is such that for the purpose of providing a variable reluctance type angle detector that is light in weight and low in cost and makes it possible to eliminate harmonics and to improve accuracy and makes mechanical winding possible, and in order to achieve this purpose, the angle detector has an exciting winding (4) and n-phase output windings (6, 7) in the slots (2) of a stator (1), and a rotor (5) disposed for rotation relative to the stator (1), having a shape such that the permeance of the gap between the rotor and the stator (1) changes in a sinusoidal manner relative to an angle (υ)?), and having only magnetic members and no winding, wherein the number of poles of the exciting winding (4) is 1/2 of the number of magnetic poles (3) and the output windings (6, 7) are wound such that the distribution of the induced voltage generated in the output windings (6, 7) corresponding to one phase of the n-phase output windings (6, 7) is a sinewave distribution.

Description

Description B-type angle detector Technical field

The present invention relates to a variable reluctance angle detector, and in particular, removes harmonic components, improves accuracy, and reduces cost by winding excitation windings at every other magnetic pole pitch for each magnetic pole. And new improvements to enable mechanical winding. Background art

Conventional examples of this type of angle detector include the resolvers shown in Figs. That is, in FIG. 3, the stator 1 is a ring-shaped magnetic material having four slots 2 formed between four salient poles 3, and each salient pole (magnetic pole) 3 has a slot 2. The one-phase excitation winding 4 is wound so as to be positioned in the inside. At the center position of the stator 1, a rotor 5 composed of only an iron core having no winding is rotatably provided, and the center of the rotor 5 is decentered from the center of the stator 1, so that The rotor is configured such that the gap permeance between the rotor 5 and the salient poles 3 of the stator 1 changes sinusoidally with respect to the angle Θ.

In addition, sin and cos output windings 6 and 7 are wound with every other magnetic pole pitch for each magnetic pole 3, and sin output winding 6 outputs sin wave sin output voltage 8 and cos output The winding 7 outputs a cos output voltage 9 of a cos wave. As shown in FIG. 4, the exciting windings 4 are provided sequentially on each magnetic pole 3, that is, at a pitch of one slot. Therefore, as shown in FIG. 5, the excitation voltage supplied via the excitation winding 4 causes the rotation of the rotor 5 and the sin output winding 6 and the cos output winding 7 to produce the a shown in FIG. , As shown in FIG. 6, waveforms corresponding to B, c, and D are output as a + B cos output voltage 9 and c + D sin output voltage 8 as the rotor 5 rotates.

The conventional variable reluctance angle detector has the following problems because it is configured as described above. That is, since the change in magnetic flux crossing the output winding due to the change in the gap between the rotor and the stator is detected as a voltage output change, the output voltage changes in proportion to sin and cos S, Due to the influence of the error in the shape of the rotor, harmonic components were generated, and it was extremely difficult to improve the output accuracy. If the coil is used to remove harmonic components, the output winding can be short-winded as shown in Fig. 5.However, in this method, the exciting winding and the output winding are interleaved in each slot. Therefore, mechanical winding was very difficult.

In order to solve such a problem, for example, a barrier pull reluctance type angle detector as disclosed in Japanese Patent Application Laid-Open No. 8-178611 has been proposed. In the variable reluctance angle detector described in this document, the output winding is wound so that the induced voltage distribution generated in the output winding for one phase of the output winding has a sine wave distribution. . As a result, it is difficult to reduce the number of windings (amount) because the windings corresponding to the magnetic poles are wound on each magnetic pole. Was difficult. Disclosure of the invention

SUMMARY OF THE INVENTION An object of the present invention is to provide a variable reluctance type angle detector which is capable of removing harmonic components, improving accuracy, and mechanically winding at low cost at a low cost. The above object is achieved by the present invention described below.

(1) An exciting winding 4 and n-phase output windings 6 and 7 are provided in a slot 2 of the stator 1 and are provided rotatably with respect to the stator 1. The gap permeance has a shape that changes sinusoidally with respect to an angle of 0, and the gap A variable reluctance type angle detector having a rotor 5 having only a configuration and no windings,

The exciting winding (4) is wound only on one polarity side of all the magnetic poles (3), and is generated in the one-phase output windings 6, 7 of the n-phase output windings 6, 7. A variable reluctance type angle detector in which the output windings 6 and 7 are wound so that an induced voltage distribution becomes a sine wave distribution.

(2) The variable reluctance angle detector according to the above (1), wherein the number of poles of the exciting winding (4) is 1 to 2 of the total number of magnetic poles (3).

(3) The variable reluctance type angle detection ^ 5 of the above-mentioned 1, wherein the excitation winding 4 is used for output and the output windings 6 and 7 are used for excitation, thereby forming an n-phase excitation Z 1-phase output. Action

In the variable reluctance angle detector according to the present invention, the excitation winding is wound at every other magnetic pole pitch for each magnetic pole, and the output winding is wound at every other magnetic pole pitch for each magnetic pole. . The rotor is shaped so that the generated induced voltage distribution becomes a sine wave distribution and the gap between the stator and the stator changes sinusoidally with respect to the angle Θ. Therefore, a sin output voltage and a cos output voltage are obtained from each output winding according to the rotation of the rotor. Therefore, it is possible to reduce harmonic components included in each output voltage. In addition, since the winding is wound on each magnetic pole one by one, mechanical winding by a winding machine is possible. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic configuration diagram showing a variable reluctance angle detector according to the present invention. FIG. 2 is an explanatory diagram showing a winding structure of each slot in FIG.

FIG. 3 is a configuration diagram of a conventional angle detector.

FIG. 4 is an explanatory diagram showing a winding structure of each slot in FIG.

FIG. 5 is an explanatory view showing a conventional winding structure.

FIG. 6 is a waveform diagram showing the output voltage of FIG.

BEST MODE FOR CARRYING OUT THE INVENTION

The variable reluctance angle detector of the present invention has an exciting winding 4 and n-phase output windings 6 and 7 in a slot 2 of a stator 1 and is rotatably provided with respect to the stator 1. A variable reluctance type angle detector having a rotor 5 having a shape in which the gap permeance between the stator 1 and the stator 1 changes sinusoidally with respect to the angle Θ and having no magnetic material and no winding. And the excitation winding 4 has all magnetic poles.

3 so that the induced voltage distribution generated in the output windings 6 and 7 for one phase of the n-phase output windings 6 and 7 becomes a sine wave distribution. Output windings 6 and 7 are wound.

As described above, the excitation winding 4 is wound around only one polarity (S or N) of the magnetic poles 3, and is preferably wound so that the number of poles is 1 Z 2 which is the number of the magnetic poles 3. In other words, by winding the winding around every other magnetic pole, an effect approximately equivalent to winding the excitation winding around all the magnetic poles can be obtained with a winding amount of about half.

The stator 1 of the present invention is a hollow ring-shaped magnetic material, having a plurality of magnetic poles protruding in the center direction thereof, and having a slot around which a winding is wound between these magnetic poles. I have.

An excitation winding and an output winding are wound around the magnetic poles of such a stator. The excitation winding is a winding for generating a magnetic field, and the output winding is a winding for extracting an excitation voltage generated by the excitation winding and excited by a magnetic field that is changed by the rotational movement of the rotor. In the present invention, the exciting winding is wound every other magnetic pole. The output winding is distributed so that the generated induced voltage distribution becomes a sinusoidal distribution. When an exciting voltage is applied to this exciting winding, if the winding is wound so that the N pole appears on the wound magnetic pole, for example, an S pole appears on the magnetic pole on which the exciting winding is not wound. . As a result, the same effect as when exciting coils are wound on all magnetic poles can be obtained, and the number of windings can be reduced to almost half, so that manufacturing cost and weight can be significantly reduced. In monkey.

The rotor 5 is a deformed cylindrical or disk-shaped magnetic material, and the gap between its outer surface and each magnetic pole of the stator 1 is changed by the rotation operation, and the rotor 5 is rotated by the excitation winding and the output winding. It is formed so that an output signal corresponding to the amount of displacement can be obtained. This shape may be a disk-shaped or cylindrical rotating body whose center axis is deviated from the center axis of the stator, but as will be described later, in order to remove harmonic distortion, a protrusion having a predetermined number of poles is used. It is preferable that the shape has a portion.

The material constituting the rotor 5 and the stator 1 is not particularly limited as long as it is a magnetic material, and it is possible to use a material used for a normal resolver. Steel sheets, soft magnetic iron, etc. are preferred, and silicon steel sheets are particularly preferred. Next, a more detailed shape of the rotor 5 will be described. The shape of the rotor 5 can be determined by using a method for determining the shape of the rotor of a normal variable reluctance resolver.Preferably, a method described in Japanese Patent No. 2698013 is used. Use.

The rotor 5 is made of a magnetic material having N salient poles and does not have a winding, and the rotor is fully driven by the action of the magnetomotive force generated by the current of the exciting winding and the fluctuation of the gap tolerance due to the salient poles. When moving 1 ZN around the circumference, the spatial position of the peak value of the magnetic flux density uses the 1 ZN movement around the entire circumference.

The induced voltage to the output winding due to this magnetic flux density is as follows. If two phases or three phases are used, a two-phase or three-phase voltage of a sinusoidal waveform with one cycle of 1 ZN movement of the entire circumference of the rotor is used. When the line is single-phase, the sine wave voltage changes its phase by 2π when the rotor moves 1 ZN around the entire circumference. Since the relationship between these voltages and the rotor position is the same as that of the resolver or synchro currently used, processing this output voltage with the RZD conversion means makes it possible to use an inexpensive resolver or a simple structure. Can be used as a sink.

In this method, it is important to minimize the harmonic components contained in the induced voltage in the output winding, which cause errors. In the present invention, the variation of the gap permeance coefficient due to Ν salient poles due to the rotor position 0 becomes a value proportional to cos (Ν), and the salient pole shape in which the harmonic component becomes extremely small. Can be realized.

INDUSTRIAL APPLICABILITY The variable reluctance angle detector of the present invention can be used not only for angle detection, but also for angular velocity (rotational speed) detection and rotation direction detection. It can be used not only for detecting the steering rotation angle of an automobile, but also for detecting the rotation angles of various rotating bodies.

Example

Example 1>

Hereinafter, preferred embodiments of a variable reluctance angle detector according to the present invention will be described in detail with reference to the drawings. The same or equivalent parts as those in the conventional example will be described with the same reference numerals. In FIG. 1, a stator 1 is a ring-shaped magnetic material having 12 slots 2 formed between 12 salient poles 3, and each salient pole 3 is located in each slot 2. The one-phase excitation winding 4 is wound as described above. The number of poles of the exciting winding 4 is 1 Z 2 which is the number of the magnetic poles 3. At the center position of the stator 1, a rotor composed of only an iron core having no winding is rotatably provided, and the center of the rotor 5 is fixed. Since the eccentricity is deviated from the center of the stator 1, the rotor 5 is configured so that the gap permeance between the rotor 5 and the salient pole 3 of the stator 1 changes in a sinusoidal manner with respect to the angle 0. ing. Note that the rotor 5 is not limited to the eccentric configuration, and has the same function when it is concentric and deformed into a concave and convex shape instead of a circle.

In addition, sin output windings 6 and cos that are wound at a slot pitch of 1 in each slot 2 (electrical windings are sequentially inserted into each slot without slot skipping) with an electrical angle of 90 ° different from each other in the two phases. The output winding 7 has a distributed winding (not shown in FIG. 1) such that the induced voltage distribution becomes a sinusoidal distribution as shown in FIG. ) Also has a sinusoidal distribution). The number of turns of each of the output windings 6 and 7 is an evening number proportional to sin 0 (cos O) and its polarity (forward or reverse winding) is defined by each slot of sin output voltage 8 and cos output voltage 9 It is determined in consideration of the polarity of the magnetic flux induced by the exciting winding 4 so as to match the polarity at the two positions. That is, as shown in FIG. 2, when the exciting winding 4 is positive (N) and the output windings 6 and 7 are positive, the output is positive, and the exciting winding 4 is positive (N) and the output windings 6 and 7 are positive. When 7 is reverse winding, the output is negative phase, when the excitation winding 4 is reverse polarity (S) and the output windings 6 and 7 are positive, the output is negative phase, and when the excitation winding 4 is reverse polarity (S), When the output windings 6 and 7 are reverse winding, the output windings 6 and 7 are set so that the sin output voltage 8 and the cos output voltage 9 become sin-shaped and cos-shaped, assuming a winding structure that outputs positive phase. Determine the polarity of 7 (positive winding is reverse winding).

The configuration in Fig. 1 described above shows the case of two-phase output IX (X is a multiple of the axis). However, it is noted that n-phase output and multi-pole output type (2X or more) are also possible. In addition, the number of slots other than 12 is not limited to the above-mentioned case of 12 slots. The configuration in Fig. 1 shows the case of 1-phase excitation / n-phase (2-phase) output, but the excitation side and output side are reversed, and n-phase (2-phase) excitation Z 1-phase output It is also possible.

<Example 2> The output winding of the present invention is preferably a distributed winding. Table 1 below shows a specific configuration example of such a distributed winding. The distributed winding shown in Table 1 is obtained by winding a winding around a stator as shown in Fig. 1, and in this example, the number of magnetic poles is 12.

Angle 0 30 60 90 120 150 180 210 240 270 300 330 Magnetic pole 1 2 3 4 5 6 7 8 9 10 11 12 Excitation coil Polarity N (S) N (S) N (S) N (S) N (S) N (S) Number of turns 45 45 45 45 45 45 Output coil A polarity NSNSNSNSNSNS Number of turns 71 26 97 71 26 97 71 26 97 71 26 97 Output coil B polarity SSNSSNSSNSSN Number of turns 71 97 26 71 97 26 71 97 26 71 97 26 Table 1 , N is positive pole, S is reverse pole

In Table 1, the excitation coil is wound only on the magnetic pole part forming the N pole, and not wound on the magnetic pole forming the S pole. In addition, each output of the output coil generates an excitation voltage corresponding to the number of turns, and these are superimposed on each other to obtain a sinusoidal output waveform.

When 10 kHz and 7 V (rms) were applied to such a distributed winding excitation coil (20 Ω), a sinusoidal output voltage of 2 V (rms) was obtained from each output coil. The output coils A and B at this time were 40 Ω, respectively, and the obtained output waveform was a sin and cos waveform with little distortion in two cycles. Effect

As described above, in the variable reluctance angle detector of the present invention, the output windings are provided at one slot pitch and the number of turns (amount) has a sine wave distribution. Volume), which is half that of conventional models, which can achieve weight reduction and significant cost reduction. Also, harmonic components included in the output voltage (induced voltage) can be reduced. For this reason, the angle detection accuracy can be improved (the error is 1 Z2 to 15) as compared with the conventional configuration. In addition, since this sine wave distribution is formed by one-slot pitch distribution winding, automation using mechanical winding by a winding machine can be achieved.

Claims

The scope of the claims

1. The stator (1) has an excitation winding (4) and an n-phase output winding (6, 7) in the slot (2).

It is provided rotatably with respect to the stator (1), has a shape in which the gap permeance with the stator (1) changes sinusoidally with respect to an angle of 0, and uses only a magnetic member. A variable reluctance angle detector having a rotor (5) having no winding,

The exciting winding (4) is wound only on one polarity side of all the magnetic poles (3), and one phase output winding (6, 7) of the n-phase output winding (6, 7) is provided. A variable reluctance type angle detector in which the output windings (6, 7) are wound so that the induced voltage distribution generated in (2) becomes a sine wave distribution.

2. The variable reluctance type angle detector according to claim 1, wherein the number of poles of said exciting winding (4) is 12 of the number of all magnetic poles (3).

3. An n-phase excitation / 1-phase output is constituted by using the excitation winding (4) for output and the output winding (6, 7) for excitation.

Angle detector.