JP2001359265A - Rotation detector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase transformation ratio by employing a magnetic material of superior high-frequency characteristic for an annual stator and the like. SOLUTION: The rotation detector uses a material of superior high-frequency characteristic as a magnetic material, constituting the annual stator (1) thereof and an excitation signal with a frequency in the range of 20 kHz to a few hundreds of kHz, for increasing transformation ratio so that the characteristics of the rotation detector are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation detector and, more particularly, to a ring-shaped stator or the like made of a magnetic material having excellent high-frequency characteristics and having an excitation frequency of 20 kHz to several 100 kHz.
The present invention relates to a novel improvement for increasing the transformation ratio and increasing the rotation detection efficiency by increasing the rotation detection efficiency.

[0002]

2. Description of the Related Art Resolvers, variable reluctance type resolvers, N-phase resolvers, synchros, and variable reluctance type synchros which have been used in this type of rotation detectors are conventionally used as stators for a ring-shaped stator, a rotor and a rotary transformer. As the material of the rotor transformer, 3% silicon steel or permalloy has been mainly used.

[0003]

Since the material used for the conventional rotation detector is constituted as described above, there are the following problems. That is, for example, the upper limit of the excitation frequency of a resolver using the above magnetic material is 10
About 20 kHz, and the excitation frequency is several tens kHz.
Attempts to increase the transformer ratio by increasing the frequency to several hundreds of kHz have led to a decrease in the rotation detection efficiency of the resolver due to an increase in iron loss and a decrease in magnetic permeability.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems. In particular, a ring-shaped stator or the like is formed of a magnetic material having excellent high-frequency characteristics, and the excitation frequency is set to 20 kHz.
It is an object of the present invention to provide a rotation detector in which the transformation ratio is increased by increasing the frequency to several hundred kHz to increase the rotation detection efficiency.

[0005]

According to the present invention, there is provided a rotation detector in which a rotor is rotatably provided inside a ring-shaped stator having a stator winding, and an excitation signal is supplied to an excitation winding of the stator winding. In the rotation detector, a material having excellent high-frequency characteristics is used as a magnetic material constituting the annular stator, and the frequency of the excitation signal is set to 20 kHz or more.
The magnetic material has a configuration of several hundred kHz, the magnetic material has a configuration of 6.5% silicon steel or soft ferrite, and the rotor has a configuration of the magnetic material according to claim 1 or 2. And a stator transformer and / or a rotor transformer of a rotary transformer provided adjacent to the ring-shaped stator is made of the magnetic material.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a rotation detector according to the present invention will be described below with reference to the drawings. 1 and 2 show the configuration of a variable reluctance resolver as an example of a rotation detector according to the present invention. In FIG. 1, reference numeral 1 denotes twelve slots 2 formed between twelve salient poles 3 as an example.
A one-phase excitation winding 4 which is a stator winding is wound around each salient pole 3 so as to be located in each slot 2. The excitation winding 4
Are the same as the number of slots 2. At the center position of the annular stator 1, a rotor 5 composed of only an iron core having no winding is rotatably provided. Since the center of the rotor 5 is deviated from the center of the annular stator 1, The rotor 5 is configured such that the gap permeance between the rotor 5 and the salient pole 3 of the annular stator 1 changes sinusoidally with respect to the angle θ. This rotor 5
Is not limited to the eccentric configuration, but has the same effect when the shape is not concentric and is not circular but is deformed into an uneven shape.

Further, the stator windings are wound at a slot pitch of 1 in each slot 2 (electrical windings are sequentially inserted in each slot without causing any slot skipping) so that the electrical angles of the two phases differ from each other by 90 °. SIN output winding 6 and COS
Although not shown in FIG. 1, the output winding 7 has a distributed winding (the number of turns (amount) of the winding is also such that the induced voltage distribution becomes a sinusoidal distribution, as shown in FIG. 2). Sinusoidal distribution). The output windings 6, 7
Is the number of turns in proportion to SINθ (COSθ), and the polarity (positive or reverse) of the excitation winding is adjusted to match the polarity of the SIN output voltage 8 and the COS output voltage 9 at the position of each slot 2. 4 in consideration of the polarity.

That is, as shown in FIG.
Is in-phase output when the output windings 6 and 7 are forward windings, and in-phase output when the excitation winding 4 is forward winding and the output windings 6 and 7 are reverse windings. The SIN output is based on the premise that the winding structure is such that the output windings 6 and 7 are in the normal winding and the exciting winding 4 is in the reverse winding when the output windings 6 and 7 are in the reverse winding and the output windings 6 and 7 are in reverse winding. The polarity (forward or reverse) of each of the output windings 6 and 7 is determined so that the voltage 8 and the COS output voltage 9 become SIN and COS.

The material of the above-mentioned annular stator 1 is, for example,
Since it is made of a magnetic material made of a material having higher frequency characteristics than conventional materials such as 6.5% silicon steel or soft ferrite, the excitation signal is 20 kHz to several tens.
A 0 kHz signal can be used. FIG. 3 shows a transformation ratio vs. frequency characteristic as a resolver using the conventional magnetic material and the magnetic material of the present invention. The transformation ratio decreases in the conventional example at 10 kHz, and the transformation ratio increases in the present invention. are doing.

In the above embodiment, a variable reluctance resolver is shown as the rotation detector.
The present invention is not limited to this, and can be applied to a resolver, an N-phase resolver, a synchro, a variable reluctance type synchro, and the like. Further, although not shown, the magnetic material having excellent high-frequency characteristics as described above is not limited to the annular stator 1, and is not limited to the rotor 5, the stator transformer of the rotary transformer adjacent to the annular stator 1 and / or the rotor transformer. When the material is used, the above-described operation can be obtained.

[0011]

As described above, the rotation detector according to the present invention has the following advantages. That is, since a material having excellent high frequency characteristics such as 6.5% silicon steel or soft ferrite is used as a magnetic material used for the annular stator of the rotation detector, etc.
Even when an excitation signal of 0 kHz to several hundreds of kHz is applied, a sufficient transformation ratio can be obtained, and the rotation detection accuracy can be greatly improved as compared with the related art.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a variable reluctance resolver applied to the present invention.

FIG. 2 is a characteristic diagram showing a relationship between a winding of FIG. 1 and an output voltage.

FIG. 3 is a characteristic diagram of a frequency and a transformation ratio of an excitation signal according to the present invention and a conventional one.

[Explanation of symbols]

 1 annular stator 4,6,7 stator winding 5 rotor

Claims (4)

[Claims] A rotor (5) is rotatably provided inside a ring-shaped stator (1) having a stator winding (4, 6, 7), and an exciting winding of the stator winding (4, 6, 7) is provided. In the rotation detector configured to supply an excitation signal to the wire (4), the ring-shaped stator (1)
A material having excellent high-frequency characteristics as the magnetic material constituting
a rotation detector characterized by z. 2. The rotation detector according to claim 1, wherein the magnetic material is made of 6.5% silicon steel or soft ferrite. 3. The rotation detector according to claim 1, wherein the rotor is made of the magnetic material according to claim 1. 4. The rotation detector according to claim 1, wherein a stator transformer and / or a rotor transformer of a rotary transformer provided adjacent to the annular stator (1) is made of the magnetic material.