JP2000258187A - Device for detecting zero location of variable reluctance-type resolver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the highly accurate detection of the location of a datum in a simple constitution by detecting the location of a detection part formed of a recessed part or a protruded part provided for a rotor by changes in output voltage outputted from a zero location detecting coil provided for a stator. SOLUTION: A rotor 5 rotation-freely provided for a stator 1 is formed in a non-central circle in which a gap permeance with the stator 1 changes in a sine-wave state to the angle of rotation θ. A detection part 20 formed of a recessed part or a protruded part is formed at the location of one datum which forms a minimum gap in the periphery of the rotor 5. A zero location detecting coil 21 is provided at one salient pole 3 of the stator 1 for detecting the detection part 20. When the rotor 5 is rotated, two-phase sine wave-shaped resolver signals are outputted from output coils 6 and 7 according to the angle of rotation θ. In this case, one zero location detection signal per rotation with the lowering of level change is obtained from the zero location detecting coil 21 in the case that the detection part 20 is a recessed part. One zero location detection signal with the rise of level change is obtained in the case that the detection part 20 is a protruded part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for detecting a zero position of a variable reluctance resolver, and more particularly to a novel improvement for detecting a zero position accurately by detecting a concave or convex portion provided on a rotor. About.

[0002]

2. Description of the Related Art As a conventional variable reluctance type resolver, for example, Japanese Unexamined Patent Publication No.
A configuration disclosed in Japanese Patent Application No. 178611 is disclosed. That is, what is indicated by reference numeral 1 in FIG. 7 is a ring-shaped stator having twelve slots 2 formed between twelve salient poles 3, and each salient pole 3 has , The one-phase excitation winding 4 is wound. The number of poles of the exciting winding 4 is the same as the number of the slots 2. At the center position of the stator 1, a rotor consisting 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; The rotor 5 is configured such that the gap permeance between the stator 5 and the salient poles 3 of the stator 1 changes sinusoidally with respect to the angle θ. Note that the rotor 5 is not limited to the eccentric configuration, and has the same effect when it is concentric and deformed into a concave and convex shape instead of a circle.

In addition, the SIN output windings 6 are wound at a slot pitch of 1 in each slot 2 (in a state in which windings are sequentially inserted into each slot without causing any slot skipping) so that the electrical angles of the two phases differ from each other by 90 °. And the COS output winding 7
Although not shown in the figure, as shown in FIG. 8, the windings are wound in a distributed manner so that the induced voltage distributions become sinusoidal distributions (the number of turns of the windings also becomes a sinusoidal distribution). Have been. The number of turns of each of the output windings 6 and 7 is SINθ
The number of turns in proportion to (COS θ) and its polarity (positive or reverse winding) take into account the polarity of the exciting winding 4 so as to match the polarity of the SIN output voltage 8 and the COS output voltage 9 at each slot 2 position. Decide while doing.

[0004] 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 of each output winding 6, 7 (positive winding is reverse winding) is determined so that the voltage 8 and the COS output voltage 9 become SIN-shaped and COS-shaped.

[0005]

Since the conventional variable reluctance resolver is configured as described above, there are the following problems. That is, in the conventional configuration, a plurality (2x = 2,
Since a large output voltage change of 3x = 3) is obtained, a subsequent waveform shaping and correction circuit and the like are required, and the circuit configuration is complicated. Further, since the rotor has only an eccentric or non-circular shape, the level of change in zero pressure at the time of detecting the zero position is small, and it has been difficult to improve the detection accuracy.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in particular, a variable reluctance in which a zero position is accurately detected by detecting a concave portion or a convex portion provided on a rotor. It is an object of the present invention to provide a zero-position detecting device for a mold resolver.

[0007]

SUMMARY OF THE INVENTION A variable reluctance resolver zero position detecting device according to the present invention is provided with an exciting winding and an n-phase output winding on a ring-shaped stator and rotatably with respect to the stator. In a variable reluctance resolver using a rotor having a configuration in which the gap permeance between the stator and the stator has a non-circular shape that changes sinusoidally with respect to the rotation angle θ and has no winding with only an iron core, A zero position detection winding provided on the stator, and a detection unit provided on the rotor and formed of a concave portion or a convex portion, and an output voltage output from the zero position detection winding to the position of the detection unit. This is a configuration for detecting by change.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a variable reluctance resolver zero position detecting apparatus according to the present invention will be described below with reference to the drawings. The same or equivalent parts as those in the conventional example will be described using the same reference numerals. In FIG. 1, what is indicated by reference numeral 1 is a ring-shaped stator having an excitation winding 4, n-phase output windings 6, 7, slots 2, and salient poles 3. The excitation winding 4 is configured as shown in FIGS. 4 and 5 shown in the conventional example.

In the rotor 5 rotatably provided corresponding to the stator 1 shown in FIG. 1 described above, the gap permeance between the rotor 1 and the stator 1 changes sinusoidally with respect to the rotation angle θ. It has a non-circular shape and has no iron core and no winding. At an origin position at one position where the minimum gap is formed on the outer periphery of the rotor 5, a detection unit 20 including a concave portion (a convex portion is not shown, but may be a convex portion) is formed, and the detection portion 20 is detected. 1 of the stator 1
Each of the salient poles 3 is provided with a zero position detection winding 21.

Next, the operation will be described. First, when rotating in the state shown in FIG. 1, a two-phase sinusoidal resolver signal 22 is output from the output windings 6 and 7 as shown in FIG. In this case, from the zero position detecting winding 21, as shown in FIG.
2, that is, in FIG. 2, the zero position detection signal Vx ′ is output in which the level change decreases when the detection unit 20 is a concave portion.
When the detection unit 20 is a convex portion, a zero position detection signal Vx ′ whose level change increases is obtained. Accordingly, the zero position detection signal Vx ′ having a digital waveform shown in FIG. 3 can be obtained by processing the zero position detection signal Vx ′ by a well-known signal processing circuit (not shown). In the above-described embodiment, the configuration in which the stator 1 has the plurality of salient poles 3 has been described. It goes without saying that the present invention can be applied to a resolver having a winding, an output winding, and the like. Further, the output windings 6 and 7 are not limited to well-known distributed windings, and other winding forms are also possible.

[0011]

The zero position detecting device for a variable reluctance resolver according to the present invention is configured as described above, and therefore the following effects can be obtained. That is, since the detection portion formed of the concave portion or the convex portion formed on the rotor is detected by the zero position detection winding provided on the stator, the origin position can be detected with a simple configuration and with high accuracy.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a zero position detection device of a variable reluctance resolver according to the present invention.

FIG. 2 is a waveform diagram showing a resolver signal and a zero position signal.

FIG. 3 is a digital waveform diagram showing a zero position signal.

FIG. 4 is a configuration diagram showing a conventional resolver.

FIG. 5 is an output waveform diagram of the resolver of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stator 4 Excitation winding 5 Rotor 6, 7 Output winding 20 Detector 21 Zero position detection winding

Claims (1)

[Claims] An annular stator (1) is provided with an exciting winding (4) and an n-phase output winding (6, 7), and is provided rotatably with respect to the stator (1). A rotor having a non-circular shape in which the gap permeance with the child (1) changes sinusoidally with respect to the rotation angle θ, and having no winding with only an iron core
In the variable reluctance resolver using (5), the zero position detection winding (21) provided on the stator (1)
And a detection unit (20) provided in the rotor (5) and formed of a concave portion or a convex portion, and an output voltage output from the zero position detection winding (21) by detecting the position of the detection unit (20). A variable reluctance resolver zero-position detecting device, characterized in that the zero-position detecting device is configured to detect by a change.