Absolute angle position detection method and device

Abstract

To provide an absolute angle position detection device capable of achieving absolute angle detection by multi-rotation detection compatible with three different resolver types: 2-phase excitation 2-phase output, 1-phase excitation 2-phase output, and 2-phase excitation 1-phase output while obtaining continuous multi-turn count data during power supply and power outage.SOLUTION: An absolute angle position detection device 100 includes a signal processing unit 101 and a switching unit 120. When power is on, the switching unit 120 supplies a 1-phase or 2-phase AC excitation signal matched to a resolver method of a resolver 1A with 2-phase excitation and 2-phase output, a resolver 1B with 2-phase excitation and a 1-phase output, and a resolver 1C with 2-phase excitation and 1-phase output, and at a power outage supplies a 1-phase pulse excitation signal. With this, continuous multi-rotation count data both when power is applied and when there is a power outage compatible with three types of resolvers is obtained.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a method and device for detecting an absolute angle position, and in particular to a new improvement that is compatible with three different types of resolvers, namely, two-phase excitation two-phase output, one-phase excitation two-phase output, and two-phase excitation one-phase output, and that allows continuous detection of multi-revolution count data both when power is applied and during a power outage. [Background technology]

[0002] In a method and device for detecting an absolute angular position using a resolver, it has been proposed to perform excitation by an AC excitation signal when current is applied, and to perform excitation by a pulse excitation signal backed up by a battery when a power failure occurs. An example of a conventional method and device for detecting an absolute angular position of this type is the configuration shown in Patent Document 1.

[0003] Here, the absolute angular position detection device described in Patent Document 1 uses a one-phase excitation two-phase output resolver, and when power is applied, the resolver is excited with one-phase AC, and a calculation circuit calculates one-rotation data from a resolver / digital conversion unit and power-applied multiple-rotation count data from a rotation number count unit to generate an absolute angular position detection signal indicating a multiple-rotation position. On the other hand, during a power outage, the absolute angle position detection device is configured to excite the resolver with a one-phase pulse and to generate multiple-revolution count data during a power outage using the rotation number counting unit that is also used during power supply. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4709963 Summary of the Invention [Problem to be solved by the invention]

[0005] Although the absolute position detection device described in Patent Document 1 can obtain continuous multi-rotation count data during power supply and power outage, it has a problem that it is only compatible with one-phase excitation, two-phase output resolvers. Here, in a one-phase excitation, two-phase output resolver, the imbalance in the amplitude of the two-phase output signals directly becomes an error. For this reason, when a one-phase excitation, two-phase output resolver is used, there is a problem that it is difficult to realize high-precision absolute angle detection. For this reason, it was desirable to realize absolute angle detection through multi-rotation detection compatible with three different resolver types, namely two-phase excitation two-phase output, one-phase excitation two-phase output, and two-phase excitation one-phase output, as well as to obtain continuous multi-rotation count data both when power is applied and during a power outage.

[0006] In order to solve the above problems, the present invention has an object to provide an absolute angle position detection method and device that realizes absolute angle detection by multi-rotation detection compatible with three different types of resolvers, namely, two-phase excitation two-phase output, one-phase excitation two-phase output, and two-phase excitation one-phase output, and that can obtain continuous multi-rotation count data both when power is applied and when there is a power outage. [Means for solving the problem]

[0007] The absolute angular position detection method according to the present invention is an absolute angular position detection method for detecting rotation using a resolver of any one of two-phase excitation two-phase output, two-phase excitation one-phase output, and two-phase excitation one-phase output types, and includes the steps of: switching a switching unit to a two-phase excitation two-phase output energized state when energizing to detect rotation using a two-phase excitation two-phase output resolver; supplying a two-phase AC excitation signal to the resolver to generate a two-phase resolver signal; generating one-rotation data and energized multiple-rotation count data from the two-phase resolver signal; generating an absolute angular position signal from the one-rotation data and energized multiple-rotation count data; In the event of a power outage when detecting rotations by the resolver, the switching unit is switched to a two-phase excitation, two-phase output power outage state, a one-phase pulse excitation signal is supplied to at least one of the excitation windings of the resolver to generate a two-phase resolver signal, power outage multi-rotation count data is generated from the two-phase resolver signal, and an absolute angle position signal is generated from the power outage multi-rotation count data, and in the event of energization when detecting rotations by the one-phase excitation, two-phase output resolver, the switching unit is switched to a one-phase excitation, two-phase output energized state, one of the two-phase AC excitation signals is supplied to the resolver to generate a two-phase resolver signal, and one-rotation data and energization multi-rotation count data are generated from the two-phase resolver signal. and generates count data, generates an absolute angle position signal from the single rotation data and the energized multi-rotation count data, and when a power outage occurs when detecting rotations using a one-phase excitation two-phase output resolver, switches the switching unit to a one-phase excitation two-phase output power outage state, supplies a one-phase pulse excitation signal to the resolver to generate a two-phase resolver signal, generates power outage multi-rotation count data from the two-phase resolver signal, generates an absolute angle position signal from the power outage multi-rotation count data, and when energized when detecting rotations using a two-phase excitation one-phase output resolver, switches the switching unit to a two-phase excitation one-phase output energized state, and supplies a two-phase AC excitation A signal is supplied to generate a one-phase resolver signal, one rotation data and multiple rotation count data when power is applied are generated from the one-phase resolver signal, an absolute angle position signal is generated from the one rotation data and the multiple rotation count data when power is applied, and in the event of a power outage when rotation is detected by a two-phase excitation one-phase output resolver, the switching unit is switched to a two-phase excitation one-phase output power outage state, a one-phase pulse excitation signal is supplied to the detection winding of the resolver to generate a two-phase resolver signal which is output from the two-phase excitation winding, multiple rotation count data when power is applied is generated from the two-phase resolver signal, and an absolute angle position signal is generated from the multiple rotation count data when power is applied.

[0008] The absolute angular position detection device according to the present invention is an absolute angular position detection device that includes a signal processing unit and a switching unit, and detects rotation using a resolver of any one of two-phase excitation two-phase output, two-phase excitation one-phase output, and two-phase excitation one-phase output types, in which the switching unit switches to a two-phase excitation two-phase output energized state when energized when detecting rotation using a two-phase excitation two-phase output resolver, and the signal processing unit supplies a two-phase AC excitation signal to the resolver via the switching unit, receives a two-phase resolver signal generated by the resolver via the switching unit, and generates one-revolution data and energized multiple-revolution count data from the two-phase resolver signal. and generates an absolute angle position signal from the one-rotation data and the energized multiple-rotation count data, and the switching unit switches to a two-phase excitation, two-phase output power failure state in the event of a power failure when detecting rotations using a two-phase excitation, two-phase output resolver, and the signal processing unit supplies a one-phase pulse excitation signal to at least one of the excitation windings of the resolver via the switching unit, receives a two-phase resolver signal generated by the resolver via the switching unit, generates multiple-rotation count data during power failure from the two-phase resolver signal, and generates an absolute angle position signal from the multiple-rotation count data during power failure, and the switching unit detects rotations using the one-phase excitation, two-phase output resolver. When current is applied during detection, the state is switched to a one-phase excitation two-phase output current application state, and the signal processing unit supplies one of the two-phase AC excitation signals to the excitation winding of the resolver via the switching unit, receives a two-phase resolver signal generated by the resolver via the switching unit, generates one-rotation data and current-applied multiple-rotation count data from the two-phase resolver signal, and generates an absolute angle position signal from the one-rotation data and current-applied multiple-rotation count data, and the switching unit switches to a one-phase excitation two-phase output power outage state during power outage during rotation detection by the one-phase excitation two-phase output resolver, and the signal processing unit supplies a one-phase pulse excitation signal via the switching unit. a signal to the resolver, a two-phase resolver signal generated by the resolver is received via the switching unit, multiple-turn count data during power failure is generated from the two-phase resolver signal, and an absolute angle position signal is generated from the multiple-turn count data during power failure, the switching unit switches to a two-phase excitation one-phase output energized state when energized when detecting rotations using a two-phase excitation one-phase output resolver, the signal processing unit supplies a two-phase AC excitation signal to the resolver via the switching unit, receives a one-phase resolver signal generated by the resolver via the switching unit, and generates one-turn data and multiple-turn count data during energization from the one-phase resolver signal,An absolute angle position signal is generated from the single rotation data and the energized multiple rotation count data, and the switching unit switches to a two-phase excitation, one-phase output power failure state in the event of a power failure when detecting rotations using a two-phase excitation, one-phase output resolver, and the signal processing unit supplies a one-phase pulse excitation signal to the detection winding of the resolver via the switching unit, receives a two-phase resolver signal generated by the resolver and output from the excitation winding via the switching unit, generates multiple rotation count data during power failure from the two-phase resolver signal, and generates an absolute angle position signal from the multiple rotation count data during power failure.

[0009] In this invention, a monitoring unit is further provided that monitors the power supply state and the resolver type, and the monitoring unit switches the connection of the switching unit depending on which type the resolver is and whether the power supply state is energized or power outage.

[0010] In this invention, the signal processing unit has a first signal processing unit that receives a supply of power from an electric operating power source when energized and executes processing when energized, and a second signal processing unit that receives a supply of power from an electric operating power source when energized and executes processing when energized, and receives a supply of power from a backup power source in the event of a power outage.

[0011] In the present invention, the first signal processing unit includes an AC excitation unit that generates a two-phase AC excitation signal, and the second signal processing unit includes a pulse excitation unit that generates a one-phase pulse excitation signal.

[0012] In this invention, the signal processing unit further includes a calculation unit, which generates an absolute angle position signal from the single rotation data and the multiple rotation count data during power supply when power is applied, and generates an absolute angle position signal from the multiple rotation count data during power failure when power is lost. Effect of the Invention

[0013] According to the present invention, absolute angle detection is realized by multi-rotation detection compatible with three different resolver types, namely, two-phase excitation two-phase output, one-phase excitation two-phase output, and two-phase excitation one-phase output, and it is also possible to obtain continuous multi-rotation count data both when power is applied and when there is a power outage. [Brief description of the drawings]

[0014] [Figure 1] 1 is a configuration diagram showing a configuration of an absolute angular position detection device according to a first embodiment. [Diagram 2] 4 is an explanatory diagram showing, in a list form, how a connection state with each type of resolver is switched in the absolute angular position detection device of the first embodiment. FIG. [Diagram 3] 2 is a configuration diagram showing a connection in a two-phase excitation, two-phase output energized state when energized to a two-phase excitation, two-phase output resolver in the absolute angular position detection device of the first embodiment. FIG. [Figure 4] 2 is a configuration diagram showing a connection in a two-phase excitation, two-phase output power failure state during a power failure to a two-phase excitation, two-phase output resolver in the absolute angular position detection device of the first embodiment. FIG. [Diagram 5] 2 is a configuration diagram showing a connection in a one-phase excitation, two-phase output energized state when energized to a one-phase excitation, two-phase output resolver in the absolute angular position detection device of the first embodiment. FIG. [Figure 6] 2 is a configuration diagram showing a connection in a one-phase excitation, two-phase output power failure state during a power failure to a one-phase excitation, two-phase output resolver in the absolute angular position detection device of the first embodiment. FIG. [Figure 7] 2 is a configuration diagram showing a connection in a two-phase excitation, one-phase output energized state when energized to a two-phase excitation, one-phase output resolver in the absolute angular position detection device of the first embodiment. FIG. [Figure 8] 2 is a configuration diagram showing a connection in a two-phase excitation, one-phase output power failure state during a power failure to a two-phase excitation, one-phase output resolver in the absolute angular position detection device of the first embodiment. FIG. [Figure 9] 4 is an explanatory diagram showing a phase relationship between an excitation signal and a resolver signal during an absolute angular position detection process according to the first embodiment. FIG. [Figure 10] 4 is an explanatory diagram showing a phase relationship between an excitation signal and a resolver signal during an absolute angular position detection process according to the first embodiment. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of an absolute angular position detection method and an absolute angular position detection device of the present invention will be described with reference to the drawings.

[0016] Embodiment 1 First, the basic configuration of an absolute angular position detection device 100 in the embodiment 1 will be described with reference to Fig. 1. Fig. 1 is a configuration diagram showing the configuration of absolute angular position detection device 100 in the embodiment 1. Note that absolute angular position detection device 100 is a device that executes each processing step of an absolute angular position detection method.

[0017] [Configuration of absolute angle position detection device 100] 1, an absolute angular position detection device 100 that executes an absolute angular position detection method mainly includes a signal processing unit 101, a monitoring unit 110, and a switching unit 120. The signal processing unit 101 is provided with a first signal processing unit 130, a second signal processing unit 140, and a calculation unit 150.

[0018] The absolute angular position detection device 100 is configured to be compatible with resolvers of three different types: two-phase excitation, two-phase output, one-phase excitation, two-phase output, and two-phase excitation, one-phase output. The absolute angular position detection device 100 is connected to a resolver 1 of one of three different types: a two-phase excitation, two-phase output resolver 1A, a two-phase excitation, one-phase output resolver 1B, or a two-phase excitation, one-phase output resolver 1C. The absolute angular position detection device 100 receives power from a non-illustrated power supply during energization, and receives power from a non-illustrated backup power supply during a power outage. The backup power supply is a limited power supply source such as a battery for use during a power outage.

[0019] The monitoring unit 110 includes a power supply monitoring unit 110a and a resolver system monitoring unit 110b. The power supply monitoring unit 110a monitors the state of the energized operating power supply, that is, whether it is energized or power outage. The power supply monitoring unit 110a generates an energized / power outage switching control signal that changes the switching state of the switching unit 120 between energized and power outage, and supplies the generated energized / power outage switching control signal to the switching unit 120. Here, energized means that the energized operating power supply is valid, and power outage means that the energized operating power supply is invalid and the backup power supply is valid. The resolver method monitoring unit 110b monitors which of three different resolvers, namely, two-phase excitation two-phase output, one-phase excitation two-phase output, and two-phase excitation one-phase output, is connected to the absolute angle position detection device 100. The resolver method monitoring unit 110b may recognize the resolver method based on a resolver method setting signal supplied from the outside, or may recognize the resolver method from the resolver's model number or model identification irregularities. The resolver method monitoring unit 110b generates a resolver method switching control signal that changes the switching state of the switching unit 120 depending on the method of the connected resolver, and supplies the generated resolver method switching control signal to the switching unit 120.

[0020] Based on the power supply / power failure switching control signal and the resolver mode switching control signal from the monitoring unit 110, the switching unit 120 switches to a two-phase excitation, two-phase output power supply state when power is supplied when rotation is detected by the two-phase excitation, two-phase output resolver 1, switches to a two-phase excitation, two-phase output power failure state when a power failure occurs when rotation is detected by the two-phase excitation, two-phase output resolver 1, switches to a one-phase excitation, two-phase output power supply state when power is supplied when rotation is detected by the one-phase excitation, two-phase output resolver 1, switches to a one-phase excitation, two-phase output power failure state when a power failure occurs when rotation is detected by the one-phase excitation, two-phase output resolver 1, switches to a two-phase excitation, one-phase output power supply state when power is supplied when rotation is detected by the two-phase excitation, one-phase output resolver 1, and switches to a two-phase excitation, one-phase output power failure state when power is supplied when rotation is detected by the two-phase excitation, one-phase output resolver 1.

[0021] The switching unit 120 may be one that switches by specifically specifying the switching state by the energization / power failure switching control signal and the resolver system switching control signal, or may be one that switches by reading out the switching state stored in a memory or the like based on the energization / power failure switching control signal and the resolver system switching control signal. Also, a switching control unit that controls the state of the switching unit 120 may be provided. The switching unit 120 connects and disconnects each part based on the power / power switching control signal and the resolver system switching control signal, so it may use an analog switch such as a MOS-FET (Metal-Oxide-Semiconductor Field-Effect Transistor) that can switch resistance or impedance, or it may be configured such that a buffer circuit that can be switched to a high impedance output is connected between each part, and the buffer circuit is used in high impedance output operation when the signal is disconnected.

[0022] The first signal processing unit 130 includes a resolver / digital conversion unit 131, an AC excitation unit 132, and a timing unit 133. Here, the first signal processing unit 130 receives a supply of an energized operating power source and operates when energized.

[0023] The resolver / digital conversion unit 131 receives a resolver signal from the resolver 1 and processes the supplied resolver signal to generate one-rotation data. The resolver / digital conversion unit 131 supplies the generated one-rotation data to the calculation unit 150. The resolver / digital conversion unit 131 supplies two-phase excitation data to the AC excitation unit 132 for generating a two-phase AC excitation signal. The AC excitation unit 132 receives two-phase excitation data from the resolver / digital conversion unit 131 and generates two-phase AC excitation signals that are out of phase with each other by 90°. The generated two-phase AC excitation signals are supplied to the excitation phases of the resolver 1 via the switching unit 120 when current is applied. The timing unit 133 converts the two-phase AC excitation signal into a two-phase timing signal, and supplies the converted two-phase timing signal to a rotation number counter 142 in a second signal processing unit 140, which will be described later.

[0024] The second signal processing unit 140 is provided with a pulse excitation unit 141 and a rotation number counter 142. The second signal processing unit 140 is supplied with power from a mains power source and a backup power source, and operates continuously during both the energized state and the power outage.

[0025] The pulse excitation unit 141 is driven by a backup power supply during a power outage and generates a one-phase pulse excitation signal. The generated one-phase pulse excitation signal is supplied to the rotation count unit 142 during a power outage, and is also supplied to the excitation phase of the resolver 1 via the switching unit 120. The rotation count unit 142 operates both when power is applied and when a power failure occurs. That is, when power is applied, the rotation count unit 142 uses a two-phase timing signal and a resolver signal to generate multiple rotation count data when power is applied. Also, when a power failure occurs, the rotation count unit 142 uses a one-phase pulse excitation signal and a resolver signal to generate multiple rotation count data when a power failure occurs.

[0026] The calculation unit 150 is supplied with a power supply when current is applied, and performs calculations using the single rotation data from the first signal processing unit 130 and the current-applied multiple rotation count data from the second signal processing unit 140. As a result of the calculations, the calculation unit 150 generates an absolute angle position signal indicating the multiple rotation position. The calculation unit 150 is supplied with a backup power supply when a power outage occurs, and receives the power outage multiple rotation count data from the rotation number count unit 142 to generate an absolute angle position signal.

[0027] Here, the switching state of the connection inside the switching unit 120 will be described with reference to Fig. 2. Fig. 2 is an explanatory diagram showing, in a list format, how the connection state with resolvers of each type is switched in the absolute angle position detection device 100 of the first embodiment. The switching unit 120 performs switching according to a total of six connection states including three methods and two states each, based on the power / power switching control signal and the resolver method switching control signal from the monitoring unit 110, as follows. Below, with reference to the explanatory diagram in FIG. 2 and the explanatory diagrams in FIGS. 3 to 8 for each connection state, we will explain how absolute angle detection is achieved by multi-rotation detection compatible with three different types of resolvers, and how continuous multi-rotation count data can be obtained both when power is applied and when there is a power outage, for each connection state.

[0028] [2-phase excitation, 2-phase output energized state] 2 and 3, the state of the switching unit 120 when detecting rotation by the two-phase excitation, two-phase output resolver 1 (hereinafter, the two-phase excitation, two-phase output resolver 1 will be simply referred to as the "resolver 1A") during energization (hereinafter, referred to as the "two-phase excitation, two-phase output energized state").

[0029] Based on the energization / power failure switching control signal and the resolver system switching control signal from the monitoring unit 110, the switching unit 120 sets the two-phase excitation two-phase output energized state and connects each unit as follows. The switching unit 120 connects the sine side of the two-phase AC excitation output of the AC excitation unit 132 to the sine side of the excitation phase of the resolver 1A (hereinafter referred to as "excitation phase B"), and connects the cosine side of the two-phase AC excitation output of the AC excitation unit 132 to the cosine side of the excitation phase of the resolver 1A (hereinafter referred to as "excitation phase A"). As a result, the two-phase AC excitation signal from the first signal processing unit 130 is supplied to the two-phase excitation phases A and B of the resolver 1A via the switching unit 120.

[0030] The switching unit 120 connects the sine side of the two output phases of the resolver 1A (hereinafter referred to as "output phase A") to the sine side input of the resolver / digital conversion unit 131, and connects the cosine side of the two output phases of the resolver 1A (hereinafter referred to as "output phase B") to the cosine side input of the resolver / digital conversion unit 131. Furthermore, the switching unit 120 connects the two-phase output phases A and B of the resolver 1A to the input of the rotation number counting unit 142. As a result, the two-phase resolver signal generated by the resolver 1A by two-phase excitation is supplied to the resolver / digital conversion unit 131 and the rotation number counting unit 142 via the switching unit 120.

[0031] When excited using two-phase AC excitation signals of sinωt and cosωt, the two-phase excitation two-phase output resolver 1A outputs, as a resolver signal, a phase modulated signal whose phase changes according to the angle θ of the rotation shaft of the resolver 1. This resolver 1A is characterized by its high accuracy compared to a one-phase excitation two-phase output resolver.

[0032] Here, in the resolver 1A, with respect to two-phase excitation phases A and B that receive a two-phase AC excitation signal, the excitation phase A is formed by the excitation windings R1 and R3, and the excitation phase B is formed by the excitation windings R2 and R4. Also, with respect to output phases A and B that output a two-phase resolver signal in the resolver 1A, the output phase A is formed by the detection windings S1 and S3, and the output phase B is formed by the detection windings S2 and S4. In this case, the following output voltage equations (a1) to (a4) hold for the resolver 1A when it is energized. Here, E is the voltage, K is the transformation ratio, θ is the angle of the resolver 1A, and ω is the excitation angular frequency. For ease of explanation, the multiplication factor is set to 1. Excitation phase A:E R1-R3 =Ecosωt …(a1) Excitation phase B:E R2-R4 =E sinωt …(a2) Output phase A:E S1-S3 =K(ER 2-R4 sinθ+E R1-R3 cosθ) =K·Ecos(ωt-θ) …(a3) Output phase B:E S2-S4 =K(ER 2-R4 cosθ-E R1-R3 sinθ) =K·E sin(ωt-θ) …(a4)

[0033] As shown by the above output voltage equations (a3) ​​and (a4), the output signal of the two-phase excitation, two-phase output resolver 1A is a phase-modulated signal. This phase-modulated signal is obtained by combining amplitude-modulated signals of excitation signals that are equal in voltage but out of phase. Therefore, assuming that the resolver 1A is excited using only one of the excitation phases, an amplitude modulated signal that is the same as a one-phase excitation, two-phase output resolver signal will be obtained, as will be described later. Therefore, the absolute angular position detection method executed in the absolute angular position detection device 100 of the first embodiment actively utilizes the characteristic property of the resolver 1A that allows both two-phase excitation, two-phase output and one-phase excitation, two-phase output to be used together.

[0034] In the absolute angular position detection device 100, when the resolver 1A is excited by a two-phase AC excitation signal while energized, energized multi-revolution count data can be generated based on the phase relationship of the output phase with respect to each excitation phase of the resolver signal.

[0035] Here, the phase relationship of the resolver signal in the resolver 1A will be described with reference to Fig. 9. Fig. 9 is an explanatory diagram showing the phase relationship between the excitation signal and the resolver signal during the absolute angle position detection process in the first embodiment. Fig. 9 shows the phase relationship between the excitation signal and the resolver signal for each resolver angle when the resolver 1A is excited by a two-phase AC excitation signal. FIG. 9 shows that the phases of the resolver signals with respect to the excitation signals are divided into four combinations for each quadrant of the angle of the resolver 1A: 0° to 90°, 90° to 180°, 180° to 270°, and 270° to 360°. Here, the resolver signal phase of 0° to +180° relative to the reference excitation signal is defined as "leading," and the resolver signal phase of -180° to 0° relative to the reference excitation signal is defined as "lagging." It is possible to determine the quadrant from the combination of "lead" and "lag" in Fig. 9, and it is clear that the A-phase signal and B-phase signal in the conventional technology can be generated. Therefore, when energized, the rotation count unit 142 can generate A-phase / B-phase multi-revolution count data from the two-phase resolver signal and the two-phase timing signal generated by the timing unit 133 from the two-phase AC excitation signal.

[0036] The signal processing performed when detecting the rotation of the two-phase excitation, two-phase output resolver 1A during energization will be described below. The resolver / digital conversion unit 131 digitally converts the two-phase resolver signal supplied from the resolver 1A to generate one-revolution data. The resolver / digital conversion unit 131 supplies the generated one-revolution data to the calculation unit 150. The timing unit 133 converts the two-phase AC excitation signal into a two-phase timing signal, and supplies the converted two-phase timing signal to a rotation number counter 142 in the second signal processing unit 140. The rotation count unit 142 receives a two-phase resolver signal from the resolver 1A and a two-phase timing signal from the timing unit 133, and generates multi-rotation count data when power is applied for phase A / phase B using the two-phase timing signal and the two-phase resolver signal.

[0037] When energized, the calculation unit 150 receives and performs calculations on one-rotation data from the resolver / digital conversion unit 131 and A-phase / B-phase energized multiple-rotation count data from the rotation number count unit 142. As a result of the calculation, the calculation unit 150 generates an absolute angle position signal indicating the multiple-rotation position for the rotation of the resolver 1A.

[0038] [2-phase excitation, 2-phase output power failure state] 2 and 4, a state of the switching unit 120 when the two-phase excitation, two-phase output resolver 1A detects rotation during a power outage (hereinafter referred to as a "two-phase excitation, two-phase output power outage state") will be described.

[0039] Based on the energization / power failure switching control signal and the resolver system switching control signal from the monitoring unit 110, the switching unit 120 connects each unit as follows to a two-phase excitation two-phase output power failure state. The switching unit 120 connects the pulse excitation unit 141 to the excitation phases A and B of the resolver 1A. As a result, a one-phase pulse excitation signal from the pulse excitation unit 141 is supplied to the two-phase excitation phases A and B of the resolver 1A via the switching unit 120. The two-phase excitation phases A and B of the resolver 1A may be connected in parallel or in series. The switching unit 120 may also connect the pulse excitation unit 141 to either one of the excitation phases A and B of the resolver 1A.

[0040] Then, the switching unit 120 connects the output phases A and B of the resolver 1A to the rotation number counting unit 142. As a result, the two-phase resolver signal generated by the resolver 1A by pulse excitation is supplied to the rotation number counting unit 142 via the switching unit 120. As a result, at least one of the two excitation phases A and B of the resolver 1A is pulse excited to generate a two-phase resolver signal. The rotation count unit 142 is driven by a backup power supply, receives the two-phase resolver signal generated in the resolver 1A and the pulse excitation signal, processes the two-phase resolver signal with the pulse width of the pulse excitation signal, and generates multi-rotation count data during a power outage. The calculation unit 150 receives and calculates the power failure multiple rotation count data from the rotation number count unit 142 during a power failure. That is, during a power failure, if at least one of the two excitation phases is pulse excited, the resolver signal from the resolver 1A is output as an amplitude modulation signal. Therefore, the power failure multiple rotation count data can be generated by the same processing as in the conventional technology. As a result of the calculation, the calculation unit 150 generates an absolute angle position signal from the power failure multiple rotation count data from the rotation number count unit 142 during a power failure.

[0041] During a power outage, if two excitation phases A and B of the resolver 1A are excited with the same pulse excitation signal that is in phase with the voltage, the resolver signal is generated as an amplitude modulated signal. Therefore, multi-revolution count data during a power outage can be obtained by processing in the same way as a conventional resolver with one-phase excitation and two-phase output. Regarding the one-phase pulse excitation signal and two-phase resolver signal in the resolver 1A during a power outage, if the pulse excitation signal is f(t) and Ecosωt and Esinωt of the two-phase AC excitation signals in the above output voltage equations (a1) to (a4) are replaced with f(t) of the pulse excitation signal, the following output voltage equations (a5) to (a8) are established. Note that here too, E is the voltage, K is the transformation ratio, and θ is the angle of the resolver 1A, and the multiplication factor is set to 1 for ease of explanation. Excitation phase A:E R1-R3 =f(t) …(a5) Excitation phase B:E R2-R4 =f(t) …(a6) Output phase A:E S1-S3 =K(E R2-R4 sinθ+E R1-R3 cosθ) =√2·K·f(t)·sin(θ+45°) …(a7) Output phase B:E S2-S4 =K(E R2-R4 cosθ-E R1-R3 sinθ) =√2·K·f(t)·cos(θ+45°) …(a8)

[0042] According to the above output voltage equations (a5) to (a8), the amplitude modulation positions of the two-phase resolver signals generated as output phase A and output phase B are shifted by 45° from the actual resolver angle. However, this can be dealt with by taking the 45° shift into account and making corrections when generating the multiple-revolution count data in advance in the rotation count unit 142. To achieve two-phase in-phase excitation of two excitation phases A and B with the same pulse excitation signal f(t), there are two methods: connecting the two excitation phases A and B in parallel and performing two-phase in-phase excitation with the pulse excitation signal f(t), and connecting the two excitation phases A and B in series and performing two-phase in-phase excitation with the pulse excitation signal f(t).

[0043] When the excitation phases A and B are connected in parallel and two-phase in-phase excitation is performed by the pulse excitation signal f(t) from the pulse excitation unit 141, the above-mentioned output voltage equations (a7) and (a8) are obtained. This means that the signal level of the resolver signal, which is the output signal, is multiplied by √2 compared to when only one side of the two-phase excitation phases A and B is excited. This means that the signal strength is increased and the resistance to noise is improved, that is, the signal-to-noise ratio is improved. On the other hand, since the two-phase excitation phases A and B generally have the same impedance, when the two-phase excitation phases A and B are connected in series and two-phase in-phase excitation is performed by the pulse excitation signal f(t) from the pulse excitation unit 141, the two excitation phases can be excited by the same pulse excitation signal. In this case, the excitation voltage generated in each of the two excitation phases is half of f(t) due to voltage division. In other words, while maintaining the same signal level of the resolver signal as in the past, the total excitation current of the two excitation phases A and B can be further reduced to about 1 / 2, and the current consumption of the entire circuit can be suppressed.

[0044] The signal processing for detecting the rotation of the two-phase excitation, two-phase output resolver 1A during a power outage will be described below. The resolver 1A is pulse-excited to generate a two-phase resolver signal. The resolver 1A supplies the generated two-phase resolver signal to the rotation speed counter 142. The rotation count unit 142 receives a two-phase resolver signal generated in the resolver 1A and a one-phase pulse excitation signal from the pulse excitation unit 141, processes the two-phase resolver signal with the pulse width of the one-phase pulse excitation signal, and generates multi-rotation count data during a power outage. During a power outage, the calculation unit 150 receives and calculates the power outage multiple rotation count data from the rotation number count unit 142, and generates an absolute angle position signal.

[0045] As described above, in the resolver 1A, the rotation count unit 142 is used both during energization and during a power outage, and continuous multi-rotation detection is performed throughout energization and during a power outage, making it possible to perform continuous multi-rotation detection without interruption throughout energization and during a power outage. Also, during a power outage, the current consumption during the power outage can be reduced by pulse-exciting the excitation phase of the resolver 1A.

[0046] [1-phase excitation, 2-phase output energized state] 2 and 5, the state of the switching unit 120 when detecting rotation by the one-phase excitation, two-phase output resolver 1 when energized (hereinafter, the one-phase excitation, two-phase output resolver 1 will be simply referred to as the "resolver 1B") will be described (hereinafter, referred to as the "one-phase excitation, two-phase output energized state").

[0047] Based on the energization / power failure switching control signal and the resolver method switching control signal from the monitoring unit 110, the switching unit 120 connects each unit as follows to a one-phase excitation two-phase output energization state. The switching unit 120 connects one of the sine side or the cosine side of the two-phase AC excitation output of the AC excitation unit 132 to the excitation phase of the resolver 1B. Fig. 5 shows an example in which the sine side of the two-phase AC excitation output of the AC excitation unit 132 is connected to the excitation phase of the resolver 1B. As a result, a one-phase AC excitation signal, which is one of the two-phase AC excitation signals from the first signal processing unit 130, is supplied to one excitation phase of the resolver 1B via the switching unit 120.

[0048] Then, the switching unit 120 connects the output phase A of the resolver 1B to the sine side input of the resolver / digital conversion unit 131, and connects the output phase B of the resolver 1B to the cosine side input of the resolver / digital conversion unit 131. Furthermore, the switching unit 120 connects two output phases A and B of the resolver 1B to the input of the rotation number counting unit 142. As a result, a two-phase resolver signal generated by the resolver 1B by one-phase excitation is supplied to the resolver / digital conversion unit 131 and the rotation number counting unit 142 via the switching unit 120.

[0049] The signal processing performed when detecting the rotation of the one-phase excitation, two-phase output resolver 1B during energization will be described below. When the resolver 1B is excited with one phase of the two-phase AC excitation signal, the resolver 1B generates a two-phase resolver signal according to the angle θ of the rotation shaft of the resolver 1B. The resolver / digital conversion unit 131 receives the two-phase resolver signal from the resolver 1B and generates one-revolution data. The resolver / digital conversion unit 131 supplies the generated one-revolution data to the calculation unit 150. The timing unit 133 converts the two-phase AC excitation signal into a two-phase timing signal, and supplies the converted two-phase timing signal to a rotation number counter 142 in the second signal processing unit 140. When energized, the rotation count unit 142 receives a two-phase resolver signal from the resolver 1B and a two-phase timing signal from the timing unit 133, and generates A-phase / B-phase multi-rotation count data when energized using the two-phase timing signal and the two-phase resolver signal.

[0050] When energized, the calculation unit 150 receives and performs calculations on one-rotation data from the resolver / digital conversion unit 131 and A-phase / B-phase energized multiple-rotation count data from the rotation number count unit 142. As a result of the calculation, the calculation unit 150 generates an absolute angle position signal indicating the multiple-rotation position for the rotation of the resolver 1B.

[0051] [1-phase excitation, 2-phase output power failure state] 2 and 6, a state of the switching unit 120 when the one-phase excitation, two-phase output resolver 1B detects rotation during a power outage (hereinafter referred to as a "one-phase excitation, two-phase output power outage state") will be described.

[0052] Based on the energization / power failure switching control signal and the resolver system switching control signal from the monitoring unit 110, the switching unit 120 connects each unit as follows to a one-phase excitation two-phase output power failure state. The switching unit 120 connects the pulse excitation unit 141 to the excitation phase of the resolver 1B. As a result, a one-phase pulse excitation signal from the pulse excitation unit 141 is supplied via the switching unit 120 to the excitation phase of the resolver 1B. The switching unit 120 connects output phases A and B of the resolver 1B to the rotation number counting unit 142. As a result, a two-phase resolver signal generated by the resolver 1B by pulse excitation is supplied to the rotation number counting unit 142 via the switching unit 120.

[0053] The signal processing for detecting the rotation of the one-phase excitation, two-phase output resolver 1B during a power outage will be described below. The resolver 1B is pulse-excited to generate a two-phase resolver signal. The resolver 1B supplies the generated two-phase resolver signal to the rotation number counter 142. The rotation count unit 142 receives a two-phase resolver signal generated in the resolver 1B and a one-phase pulse excitation signal from the pulse excitation unit 141, processes the two-phase resolver signal with the pulse width of the one-phase pulse excitation signal, and generates multi-rotation count data during a power outage. During a power failure, the calculation unit 150 receives the power failure multiple rotation count data from the rotation number counter 142 and outputs an absolute angle position signal.

[0054] As described above, in the resolver 1B, the rotation count unit 142 is used both during energization and during a power outage, so that continuous multi-rotation detection can be performed without interruption during energization and during a power outage. Also, during a power outage, the excitation phase of the resolver 1B is pulse excited, so that the current consumption during the power outage can be reduced.

[0055] [2-phase excitation, 1-phase output energized state] 2 and 7, the state of the switching unit 120 when detecting rotation by the two-phase excitation, one-phase output resolver 1 (hereinafter, the two-phase excitation, one-phase output resolver 1 is simply referred to as the "resolver 1C") during energization (hereinafter, referred to as the "two-phase excitation, one-phase output energized state").

[0056] Based on the energization / power failure switching control signal and the resolver system switching control signal from the monitoring unit 110, the switching unit 120 connects each unit as follows to a two-phase excitation one-phase output energization state. The switching unit 120 connects the sine side of the two-phase AC excitation output of the AC excitation unit 132 to the excitation phase B of the resolver 1C, and connects the cosine side of the AC excitation unit 132 to the excitation phase A of the resolver 1C. As a result, the two-phase AC excitation signal from the first signal processing unit 130 is supplied to the two-phase excitation phases A and B of the resolver 1C via the switching unit 120.

[0057] Then, the switching unit 120 connects one output phase of the resolver 1C to a sine side input of the resolver / digital conversion unit 131. The switching unit 120 may connect one output phase of the resolver 1C to a cosine side input of the resolver / digital conversion unit 131. Furthermore, the switching unit 120 connects the output phase of the resolver 1C and the input of the rotation number counting unit 142. As a result, a one-phase resolver signal generated by the resolver 1C by two-phase excitation is supplied to the resolver / digital conversion unit 131 and the rotation number counting unit 142 via the switching unit 120.

[0058] When the two-phase excitation one-phase output resolver 1C is excited using two-phase AC excitation signals of sinωt and cosωt, it outputs a phase modulated signal having a phase change according to the angle θ of the rotation shaft of the resolver 1C as a resolver signal. This resolver 1C is characterized by its high accuracy compared to the one-phase excitation two-phase output resolver.

[0059] Here, in the resolver 1C, with respect to two excitation phases A and B that receive a two-phase AC excitation signal, the excitation phase A is formed by the excitation windings R1 and R3, and the excitation phase B is formed by the excitation windings R2 and R4. Also, in the resolver 1C, the output phase that outputs a one-phase resolver signal is formed by the detection windings S1 and S3. In this case, the following output voltage equations (c1) to (c4) hold for the resolver 1C when it is energized. In the following equations, the voltage is E, the transformation ratio is K, the angle of the resolver 1C is θ, and the excitation angular frequency is ω. For ease of explanation, the multiplication factor is set to 1. Excitation phase A:E R1-R3 =Ecosωt …(c1) Excitation phase B:E R2-R4 =E sinωt …(c2) Output phase: E S1-S3 =K1(E R2-R4 sinθ+E R1-R3 cosθ) =K1Ecos(ωt-θ) …(c3)

[0060] As shown in the output voltage equation (c3) above, the resolver signal, which is the output signal of the 2-phase excitation 1-phase output resolver 1C, is a phase-modulated signal. This resolver signal as a phase-modulated signal is obtained as a result of combining the amplitude-modulated signals of the respective excitation signals. If the resolver 1C is considered as a transformer in which the coupling state of the primary coil / secondary coil changes depending on the angle, it is possible to use the output phase as an excitation input instead of an output, and the excitation phase as an output. By using it in this way, the two-phase excitation one-phase output resolver 1C can be used as a one-phase excitation two-phase output type resolver, as shown in the following output voltage equations (c4) to (c6). Excitation input: E S1-S3 =Ecosωt …(c4) Output phase A:E R1-R3 =K2cosθ·Ecosωt …(c5) Output phase B:E R2-R4 =K2sinθ·Ecosωt …(c6) Note that K1 and K2 may be different values. Therefore, in this embodiment, when a two-phase excitation, one-phase output resolver 1C is used, this feature is actively utilized.

[0061] In the two-phase excitation one-phase output energization state, in formulas (c1) and (c2), when the resolver 1C is excited by a two-phase AC excitation signal, it is possible to generate multi-revolution count data during energization based on the phase relationship of the output phase with respect to each excitation phase. Here, the phase relationship of the resolver signal in the resolver 1C will be described with reference to Fig. 10. Fig. 10 is an explanatory diagram showing the phase relationship between the excitation signal and the resolver signal during the absolute angle position detection process in the first embodiment. Fig. 10 shows the phase relationship between the excitation signal and the resolver signal for each angle of the resolver 1C when the two-phase excitation one-phase output resolver 1C is excited with two-phase AC. FIG. 10 shows that the phases of the resolver signals with respect to the excitation signals are divided into four combinations for each quadrant of the angle of the resolver 1C: 0° to 90°, 90° to 180°, 180° to 270°, and 270° to 360°. Here, the resolver signal phase of 0° to +180° relative to the reference excitation signal is defined as "leading," and the resolver signal phase of -180° to 0° relative to the reference excitation signal is defined as "lagging." 10, it is possible to determine the quadrant (0°-90°, 90°-180°, 180°-270°, 270°-360°) and it is clear that the A-phase signal and B-phase signal in the conventional technology can be generated. Therefore, the rotation count unit 142 can generate A-phase / B-phase multi-rotation count data from the resolver signal and the two-phase timing signal.

[0062] The signal processing performed when detecting the rotation of the two-phase excitation, one-phase output resolver 1C during energization will be described below. The resolver / digital conversion unit 131 digitally converts the one-phase resolver signal supplied from the resolver 1C to generate one-revolution data, and supplies the generated one-revolution data to the calculation unit 150. The timing unit 133 converts the two-phase AC excitation signal into a two-phase timing signal, and supplies the converted two-phase timing signal to a rotation number counter 142 in the second signal processing unit 140. The rotation count unit 142 receives a one-phase resolver signal from the resolver 1C and a two-phase timing signal from the timing unit 133, and generates multi-rotation count data during power supply of phase A / phase B using the two-phase timing signal and the resolver signal. When energized, the calculation unit 150 receives and performs calculations on one-rotation data from the resolver / digital conversion unit 131 and A-phase / B-phase energized multiple-rotation count data from the rotation number count unit 142. As a result of the calculation, the calculation unit 150 generates an absolute angle position signal indicating the multiple-rotation position for the rotation of the resolver 1C.

[0063] [2-phase excitation, 1-phase output power failure state] 2 and 8, a state of the switching unit 120 when the two-phase excitation, one-phase output resolver 1C detects rotation during a power outage (hereinafter referred to as a "two-phase excitation, one-phase output power outage state") will be described.

[0064] In a two-phase excitation, one-phase output power failure state, the switching unit 120 connects to switch the excitation phase and the output phase of the resolver 1C. That is, the switching unit 120 connects each unit as follows in a two-phase excitation, one-phase output power failure state, based on the energization / power failure switching control signal and the resolver mode switching control signal from the monitoring unit 110. The switching unit 120 connects the output phase of the resolver 1C to the pulse excitation unit 141. Here, the output phase of the resolver 1C is used as an excitation phase. As a result, a one-phase pulse excitation signal from the pulse excitation unit 141 is supplied to the output phase of the resolver 1C via the switching unit 120. The switching unit 120 also connects the two excitation phases A and B of the resolver 1C to the rotation counting unit 142. Here, the two excitation phases of the resolver 1C are used as two output phases. As a result, the two-phase resolver signals output from the two excitation phases A and B of the resolver 1C are supplied to the rotation counting unit 142 via the switching unit 120.

[0065] During a power outage, if the detection windings (S1-S3) of the output phases of the resolver 1C are utilized as excitation phases and excited with a pulse excitation signal, the excitation windings (R1-R3 / R2-R4) of the two excitation phases A and B act as output phases, and an amplitude modulated signal corresponding to the sensor angle with a consistent phase is output. Therefore, by switching the connections of the excitation windings and detection windings to the absolute angle position detection device 100, multi-revolution count data during a power outage can be obtained by processing similar to that of one-phase pulse excitation. In the resolver 1C during a power outage, the output voltage equation when the pulse signal is f(t) can be expressed as follows by replacing cosωt and sinωt in (c5) to (c6) during the above-mentioned current application with f(t). Excitation phase:E S1-S3 =f(t) …(c7) Output phase A:E R1-R3 =K E S1-S3 cosθ=K f(t)sinθ …(c8) Output phase B:E R2-R4 =K E S1-S3 sinθ=K f(t)cosθ …(c9) In the case of a two-phase excitation, one-phase output resolver, by using the amplitude-modulated resolver output signals (c8) and (c9) generated in the excitation coil as phase acquisition signals to perform multi-revolution counting, it is possible to continue multi-revolution counting even during a power outage.

[0066] The signal processing for detecting the rotation of the two-phase excitation, one-phase output resolver 1C during a power outage will be described below. The resolver 1C is pulse excited by a pulse excitation signal supplied to a detection winding as an excitation phase, and outputs the generated two-phase resolver signal from a two-phase excitation winding as an output phase. The resolver 1C supplies the two-phase resolver signal output from the excitation winding to the rotation speed counter 142. The rotation count unit 142 receives a two-phase resolver signal generated in the resolver 1C and a one-phase pulse excitation signal from the pulse excitation unit 141, processes the two-phase resolver signal with the pulse width of the one-phase pulse excitation signal, and generates multi-rotation count data during a power outage. During a power outage, the calculation unit 150 receives and calculates the power outage multiple rotation count data from the rotation number count unit 142, and generates an absolute angle position signal.

[0067] As described above, in the resolver 1C, the rotation count unit 142 is used both during energization and during a power outage, and continuous multi-rotation detection is performed throughout energization and power outage, making it possible to perform continuous multi-rotation detection without interruption throughout energization and power outage. Also, during a power outage, the output phase of the resolver 1C is used as an excitation phase to perform pulse excitation, thereby reducing current consumption during a power outage.

[0068] [Effects obtained by the embodiment] The absolute angular position detection device 100 and absolute angular position detection method described in the first embodiment are compatible with three different types of resolvers 1 (1A, 1B, and 1C), namely, two-phase excitation, two-phase output, one-phase excitation, two-phase output, and two-phase excitation, one-phase output, and can realize absolute angle detection by multiple-rotation detection as described below, and can obtain continuous multiple-rotation count data during power supply and power outage. In other words, a highly versatile absolute angular position detection device 100 and absolute angular position detection method can be realized that are compatible with the resolvers 1A, 1B, and 1C of different types.

[0069] The absolute angular position detection device 100 includes a signal processing unit 101 and a switching unit 120, and detects rotation using resolvers 1A, 1B, and 1C of any one of two-phase excitation, two-phase output, two-phase excitation, one-phase output, and two-phase excitation, one-phase output types.

[0070] When current is applied to detect rotation using the two-phase excitation, two-phase output resolver 1A, the switching unit 120 switches to a two-phase excitation, two-phase output current application state, and the signal processing unit 101 supplies a two-phase AC excitation signal to the resolver via the switching unit 120, receives a two-phase resolver signal generated by the resolver via the switching unit 120, generates one-rotation data and multiple-rotation count data when current is applied from the two-phase resolver signal, and generates an absolute angle position signal from the one-rotation data and the multiple-rotation count data when current is applied. In the event of a power outage when rotation is detected by the two-phase excitation two-phase output resolver 1A, the switching unit 120 switches to a two-phase excitation two-phase output power outage state, and the signal processing unit 101 supplies a one-phase pulse excitation signal to at least one of the excitation windings of the resolver via the switching unit 120, receives a two-phase resolver signal generated by the resolver via the switching unit 120, generates multi-rotation count data during power outage from the two-phase resolver signal, and generates an absolute angle position signal from the multi-rotation count data during power outage.

[0071] When current is applied to detect rotation using the one-phase excitation two-phase output resolver 1B, the switching unit 120 switches to a one-phase excitation two-phase output current-applied state, and the signal processing unit 101 supplies one of the two-phase AC excitation signals to the excitation winding of the resolver via the switching unit 120, receives the two-phase resolver signal generated by the resolver via the switching unit 120, generates one-rotation data and multiple-rotation count data when current is applied from the two-phase resolver signal, and generates an absolute angle position signal from the one-rotation data and the multiple-rotation count data when current is applied. In the event of a power outage when rotation is detected by the one-phase excitation two-phase output resolver 1B, the switching unit 120 switches to a one-phase excitation two-phase output power outage state, and the signal processing unit 101 supplies a one-phase pulse excitation signal to the resolver via the switching unit 120, receives a two-phase resolver signal generated by the resolver via the switching unit 120, generates multi-rotation count data during power outage from the two-phase resolver signal, and generates an absolute angle position signal from the multi-rotation count data during power outage.

[0072] When current is applied when detecting rotation by the two-phase excitation one-phase output resolver 1C, the switching unit 120 switches to a two-phase excitation one-phase output current application state, and the signal processing unit 101 supplies a two-phase AC excitation signal to the resolver via the switching unit 120, receives a one-phase resolver signal generated by the resolver via the switching unit 120, and generates one-rotation data and current-on multiple-rotation count data from the one-phase resolver signal. An absolute angle position signal is generated from the one-rotation data and current-on multiple-rotation count data. In the event of a power outage when rotation is detected by the two-phase excitation one-phase output resolver 1C, the switching unit 120 switches to a two-phase excitation one-phase output power outage state, and the signal processing unit 101 supplies a one-phase pulse excitation signal to the detection winding of the resolver via the switching unit 120, receives a two-phase resolver signal generated by the resolver and output from the excitation winding via the switching unit 120, and generates power outage multi-rotation count data from the two-phase resolver signal. An absolute angle position signal is generated from the power outage multi-rotation count data.

[0073] According to the absolute angle position detection device 100 and the absolute angle position detection method described in the first embodiment, absolute angle detection is realized by multi-rotation detection in correspondence with the three different types of resolvers 1A, 1B, and 1C, namely, two-phase excitation two-phase output, one-phase excitation two-phase output, and two-phase excitation one-phase output, and it becomes possible to obtain continuous multi-rotation count data both when power is applied and when there is a power failure.

[0074] The absolute angle position detection device 100 explained in the first embodiment further includes a monitoring unit 110 that monitors the power supply state and the type of the resolver 1 (1A, 1B, 1C), and the monitoring unit 110 switches the connection of the switching unit 120 depending on which type the resolver 1 (1A, 1B, 1C) is and whether the power supply state is energized or in a power outage. This makes it possible to realize absolute angle detection by multi-rotation detection corresponding to the resolvers 1A, 1B, and 1C of three different types, and to reliably obtain continuous multi-rotation count data during energization and power outage.

[0075] In the absolute angular position detection device 100 described in the first embodiment, the signal processing unit 101 has a first signal processing unit 130 that receives a supply of a current-carrying operating power supply when current is applied and executes processing when current is applied, and a second signal processing unit 140 that receives a supply of a current-carrying operating power supply when current is applied and executes processing when current is applied and receives a supply of a backup power supply when a power failure occurs. This makes it possible to obtain continuous multiple-rotation count data during current application and power failure.

[0076] In the absolute angle position detection device 100 described in the first embodiment, the first signal processing unit 130 includes an AC excitation unit 132 that generates a two-phase AC excitation signal, and the second signal processing unit 140 includes a pulse excitation unit 141 that generates a one-phase pulse excitation signal. This makes it possible to perform excitation appropriate for when electricity is applied and when there is a power outage, respectively, and to obtain continuous multi-rotation count data when electricity is applied and when there is a power outage.

[0077] In the absolute angle position detection device 100 described in the first embodiment, the signal processing unit 101 further includes a calculation unit 150, which generates an absolute angle position signal from one-rotation data and energized multiple-rotation count data during energization, and generates an absolute angle position signal from power failure multiple-rotation count data during power failure. This makes it possible to realize absolute angle detection by multiple-rotation detection corresponding to the three different types of resolvers 1A, 1B, and 1C, and to reliably obtain continuous multiple-rotation count data during energization and power failure. [Explanation of symbols]

[0078] 1 resolver, 100 absolute angle position detection device, 101 signal processing unit, 110 monitoring unit, 110a power supply monitoring unit, 110b resolver method monitoring unit, 120 switching unit, 130 first signal processing unit, 131 resolver / digital conversion unit, 132 AC excitation unit, 133 timing unit, 140 second signal processing unit, 141 pulse excitation unit, 142 rotation speed counting unit, 150 calculation unit.

Claims

1. A method for detecting an absolute angular position, which detects rotation using a resolver of any one of two-phase excitation two-phase output, one-phase excitation two-phase output, and two-phase excitation one-phase output type, When power is supplied to detect rotation using a two-phase excitation, two-phase output resolver, a switching unit (120) is switched to a two-phase excitation, two-phase output power supply state, a two-phase AC excitation signal is supplied to the resolver to generate a two-phase resolver signal, one-rotation data and power-on multiple-rotation count data are generated from the two-phase resolver signal, and an absolute angle position signal is generated from the one-rotation data and the power-on multiple-rotation count data, In the event of a power outage when rotation is detected by a two-phase excitation, two-phase output resolver, the switching unit (120) is switched to a two-phase excitation, two-phase output power outage state, a one-phase pulse excitation signal is supplied to at least one of the excitation windings of the resolver to generate a two-phase resolver signal, power outage multi-rotation count data is generated from the two-phase resolver signal, and an absolute angle position signal is generated from the power outage multi-rotation count data, When current is applied when detecting rotation using a one-phase excitation two-phase output resolver, the switching unit (120) is switched to a one-phase excitation two-phase output current application state, one of two-phase AC excitation signals is supplied to the resolver to generate a two-phase resolver signal, one-rotation data and energized multiple rotation count data are generated from the two-phase resolver signal, and an absolute angle position signal is generated from the one-rotation data and energized multiple rotation count data, In the event of a power outage when rotation is detected by a one-phase excitation two-phase output resolver, the switching unit (120) is switched to a one-phase excitation two-phase output power outage state, the one-phase pulse excitation signal is supplied to the resolver to generate a two-phase resolver signal, power outage multi-rotation count data is generated from the two-phase resolver signal, and an absolute angle position signal is generated from the power outage multi-rotation count data, When current is applied when detecting rotation using a two-phase excitation one-phase output resolver, the switching unit (120) is switched to a two-phase excitation one-phase output current application state, a two-phase AC excitation signal is supplied to the resolver to generate a one-phase resolver signal, single-revolution data and energized multiple-revolution count data are generated from the single-phase resolver signal, and an absolute angle position signal is generated from the single-revolution data and energized multiple-revolution count data, In the event of a power outage when detecting rotation using a two-phase excitation one-phase output resolver, the switching unit (120) switches to a two-phase excitation one-phase output power outage state, supplies the one-phase pulse excitation signal to a detection winding of the resolver to generate a two-phase resolver signal and output it from a two-phase excitation winding, generates power outage multi-rotation count data from the two-phase resolver signal, and generates an absolute angle position signal from the power outage multi-rotation count data. Absolute angular position detection method.

2. An absolute angular position detection device comprising a signal processing unit (101) and a switching unit (120), and detecting rotation using a resolver of any one of two-phase excitation two-phase output, one-phase excitation two-phase output, and two-phase excitation one-phase output type, the switching unit (120) switches to a two-phase excitation, two-phase output energized state when energized for detecting rotation using a two-phase excitation, two-phase output resolver; the signal processing unit (101) supplies a two-phase AC excitation signal to the resolver via the switching unit (120), receives a two-phase resolver signal generated by the resolver via the switching unit (120), generates one-rotation data and energized multiple-rotation count data from the two-phase resolver signal, and generates an absolute angle position signal from the one-rotation data and the energized multiple-rotation count data; the switching unit (120) switches to a two-phase excitation, two-phase output power failure state in the event of a power failure when rotation is detected by a two-phase excitation, two-phase output resolver; The signal processing unit (101) supplies a one-phase pulse excitation signal to at least one of the excitation windings of the resolver via the switching unit (120), receives a two-phase resolver signal generated by the resolver via the switching unit (120), generates power failure multi-rotation count data from the two-phase resolver signal, and generates an absolute angle position signal from the power failure multi-rotation count data; the switching unit (120) switches to a one-phase excitation, two-phase output energized state when energized for detecting rotation using a one-phase excitation, two-phase output resolver; the signal processing unit (101) supplies one of two-phase AC excitation signals to an excitation winding of the resolver via the switching unit (120), receives a two-phase resolver signal generated by the resolver via the switching unit (120), generates one-rotation data and energized multiple-rotation count data from the two-phase resolver signal, and generates an absolute angle position signal from the one-rotation data and the energized multiple-rotation count data; the switching unit (120) switches to a one-phase excitation, two-phase output power failure state in the event of a power failure when rotation is detected by a one-phase excitation, two-phase output resolver; The signal processing unit (101) supplies a one-phase pulse excitation signal to the resolver via the switching unit (120), receives a two-phase resolver signal generated by the resolver via the switching unit (120), generates power failure multi-rotation count data from the two-phase resolver signal, and generates an absolute angle position signal from the power failure multi-rotation count data; the switching unit (120) switches to a two-phase excitation, one-phase output energized state when energized for detecting rotation using a two-phase excitation, one-phase output resolver; the signal processing unit (101) supplies a two-phase AC excitation signal to the resolver via the switching unit (120), receives a one-phase resolver signal generated by the resolver via the switching unit (120), generates one-rotation data and energized multiple-rotation count data from the one-phase resolver signal, and generates an absolute angle position signal from the one-rotation data and the energized multiple-rotation count data; the switching unit (120) switches to a two-phase excitation, one-phase output power failure state in the event of a power failure when rotation is detected by a two-phase excitation, one-phase output resolver; The signal processing unit (101) supplies a one-phase pulse excitation signal to a detection winding of the resolver via the switching unit (120), receives a two-phase resolver signal generated by the resolver and output from an excitation winding via the switching unit (120), generates power failure multi-rotation count data from the two-phase resolver signal, and generates an absolute angle position signal from the power failure multi-rotation count data. Absolute angular position detection device.

3. The device further includes a monitoring unit (110) that monitors the power supply state and the resolver system, The monitoring unit (110) switches the connection of the switching unit (120) depending on which type the resolver is and whether the power supply state is energized or power outage.

3. The absolute angular position detection device according to claim 2.

4. The signal processing unit (101) a first signal processing unit (130) that receives a power supply when energized and executes processing when energized; a second signal processing unit (140) that receives a supply of an operating power source when energized and executes processing when energized, and receives a supply of a backup power source when a power outage occurs; 3. The absolute angular position detection device according to claim 2, further comprising:

5. the first signal processing unit (130) includes an AC excitation unit (132) that generates the two-phase AC excitation signal; The second signal processing unit (140) includes a pulse excitation unit (141) that generates the one-phase pulse excitation signal.

5. An absolute angular position detection device according to claim 4.

6. the signal processing unit (101) further includes a calculation unit (150); The calculation unit (150) generates an absolute angle position signal from the single rotation data and the power-on multiple rotation count data during power-on, and generates an absolute angle position signal from the power-off multiple rotation count data during power outage.

3. The absolute angular position detection device according to claim 2.

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