Phase modulation-type redundant two-phase-output resolver and signal output method thereof

Abstract

The present invention relates to a phase modulation-type redundant two-phase-output resolver, an excitation signal (100) is applied to an excitation winding (50) of an annular stator (21) having a VR-type rotor (20) disposed therein, and a two-phase output signal (101) is outputted from first and second output windings (43, 44) that are provided in the annular stator (21), the excitation winding (50) is made up of first and second excitation windings (40, 41) of mutually different phases, and the excitation signal (100) has two phases, and even in a case where a break occurs in only any one winding from among the first and second excitation windings (40, 41) and the first and second output windings (43, 44), at least a one-phase output signal can be obtained.

Claims

1. A phase modulation-type redundant two-phase-output resolver in which an excitation signal (100) is applied to an excitation winding (50) of an annular stator (21) having a VR-type rotor (20) disposed therein, and a two-phase output signal (101) is outputted from first and second output windings (43, 44) that are provided in the annular stator (21), wherein the excitation winding (50) is made up of first and second excitation windings (40, 41) of mutually different phases, and the excitation signal (100) has two phases, and even in a case where a break occurs in only any one winding from among the first and second excitation windings (40, 41) and the first and second output windings (43, 44), at least a one-phase output signal can be obtained.

2. The phase modulation-type redundant two-phase-output resolver of claim 1, wherein in a case where a break occurs in any one of the first and second output windings (43, 44), a one-phase output signal (101) can be obtained from the other one of the first output winding (43) and the second output winding (44).

3. The phase modulation-type redundant two-phase-output resolver of claim 1, wherein in a case where a break occurs in any one of the first and second excitation windings (40, 41), a two-phase output signal can be obtained from the first and second output windings (43, 44).

4. A signal output method in a phase modulation-type redundant two-phase-output resolver, in which an excitation signal (100) is applied to an excitation winding (50) of an annular stator (21) having a VR-type rotor (20) disposed therein, and a two-phase output signal (101) is outputted from first and second output windings (43, 44) that are provided in the annular stator (21), with the excitation winding (50) being made up of first and second excitation windings (40, 41) of mutually different phases, and the excitation signal (100) including two phases, the method comprising, even in a case where a break occurs in only any one winding from among the first and second excitation windings (40, 41) and the first and second output windings (43, 44), at least a one-phase output signal can be obtained.

5. The signal output method in a phase modulation-type redundant two-phase-output resolver of claim 4, wherein in a case where a break occurs in any one of the first and second output windings (43, 44), a one-phase output signal (101) can be obtained from the other one of the first output winding (43) and the second output winding (44).

6. The signal output method in a phase modulation-type redundant two-phase-output resolver of claim 4, wherein in a case where a break occurs in any one of the first and second excitation windings (40, 41), a two-phase output signal (101) can be obtained from the first and second output windings (43, 44).

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a wiring diagram illustrating a phase modulation-type redundant two-phase-output resolver according to the present invention;

(2) FIG. 2 is a wiring diagram illustrating a conventional amplitude modulation-type resolver;

(3) FIG. 3 is a planar configuration diagram of a conventional resolver having redundant excitation windings;

(4) FIG. 4 is a wiring diagram of the resolver of FIG. 3; and

(5) FIG. 5 is a waveform diagram illustrating two-phase output signals from the output windings 60 of FIG. 4.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

(6) The phase modulation-type redundant two-phase-output resolver and the signal output method thereof according to the present invention allow maintaining a redundant system by configuring a resolver with two-phase excitation/two-phase output.

EXAMPLE

(7) Preferred embodiments of the phase modulation-type redundant two-phase-output resolver and signal output method thereof according to the present invention will be explained next with reference to accompanying drawings.

(8) In the explanation, portions identical or similar to those of the conventional example will be denoted by the same reference symbols and numerals.

(9) In FIG. 1, a VR-type rotor denoted by the reference numeral 20 is axially supported so as to be rotatable inside an annular stator 21. An excitation winding 50 of two phases for applying an excitation signal 100 and an output winding 60 of two phases for obtaining an output signal 101 are provided in each magnetic pole (not shown) of the annular stator 21.

(10) The excitation winding 50 is made up of first and second excitation windings 40, 41 disposed for two phases that differ from each other by a 90-degree phase, such that a first excitation voltage ES1-S3 is inputted to input terminals at both ends of the first excitation winding 40.

(11) A second excitation voltage ES2-ES4 is inputted to input terminals on both ends of the second excitation winding 41.

(12) The output winding 60 is made up of first and second output windings 43, 44 disposed for two phases that differ from each other by a 90-degree phase, such that a first output voltage ER1-R3 is outputted from output terminals on both ends of the first output winding 43.

(13) A second output voltage ER2-R4 is outputted from output terminals on both ends of the second output winding 44.

(14) A state for obtaining a two-phase output in the phase modulation-type redundant two-phase-output resolver of FIG. 1 according to the present invention, described above, will be explained by the following output voltage equation.

(15) Specifically, the output voltage equation of two-phase input/two-phase output in the configuration of FIG. 1 is as given below.

(16) Output Voltage Equation
ES1-S3=E sin tFirst excitation voltage
ES2-S4=E cos tSecond excitation voltage
ER1-R3=kES1-S3 cos NkES2-S4 sin N
=kE sin t.Math.cos NkE cos t.Math.sin N
=kE sin(tN)First output voltage
ER2-R4=kES1-S3 cos N+kES2-S4 sin N
=kE sin t.Math.cos N+kE cos t.Math.sin N
=kE cos(tN)Second output voltage

(17) Therefore, by inputting to the excitation winding 50 the first and second excitation voltagesan excitation signal of two phases, it becomes possible to obtain the first and second output voltagesa two-phase output signal from the output windings 60on the basis of the output voltage equation described above.

(18) Since an angle signal can be outputted for each of the first and second output voltages ER1-R3, ER2-R4, in the circuit diagram of FIG. 1 and the output voltage equation described above, even in a case where a break occurs in any one of the first and second output voltages ER1-R3, ER2-R4, still the angle can be detected from the other one from among the first and second output voltages ER1-R3, ER2-R4.

(19) In a case of 0 (zero) excitation voltage due to occurrence of a breakage in any one of the first and second excitation voltages ES1-S3, ES2-S4 described above, since any of the first and second output voltages ER1-R3, ER2-R4 is 0 (zero), angle detection is still possible in the same way as in a conventional amplitude modulation scheme with one-phase input/two-phase output.

(20) In the circuit diagram of FIG. 1, therefore, angle detection is possible also in a case where a break occurs in windings 40, 41, 43, 44 each having one phase alone of any one of the excitation winding 50 and the output windings 60. Accordingly, the circuit diagram of FIG. 1 can be regarded as having a redundant system.

(21) The phase modulation-type redundant two-phase-output resolver and signal output method thereof according to the present invention are as follows.

(22) In a two-phase output-type resolver in which an excitation signal 100 is applied to an excitation winding 50 of an annular stator 21 having a VR-type rotor 20 disposed therein, and a two-phase output signal 101 is outputted from first and second output windings 43, 44 that are provided in the annular stator 21, with the excitation winding 50 being made up of first and second excitation windings 40, 41 of mutually different phases, and the excitation signal 100 including two phases, provided are: a configuration and a method are provided in which even in a case where a break occurs in only any one winding from among the first and second excitation windings 40, 41 and the first and second output windings 43, 44, at least a one-phase output signal 101 can be obtained; a configuration and a method in which in a case where a break occurs in any one of the first and second output windings 43, 44, a one-phase output signal 101 can be obtained from the other first output winding 43 or second output winding 44; and a configuration and a method in which in a case where a break occurs in any one of the first and second excitation windings 40, 41, a two-phase output signal 101 can be obtained from the first and second output windings 43, 44.

(23) The phase modulation-type redundant two-phase-output resolver and signal output method thereof according to the present invention allow at least a one-phase output signal to be obtained even in a case where a break occurs in only any one winding from among excitation windings and output windings, whereby, a highly reliable redundant system can be obtained.