Method and apparatus for detecting absolute angular position

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 an absolute angular position detection method and apparatus, and more particularly to a novel improvement that supports three different types of resolvers: two-phase excitation and two-phase output, one-phase excitation and two-phase output, and two-phase excitation and one-phase output, and enables continuous detection of multiple rotation count data both when power is supplied and when power is depleted. [Background technology]

[0002] In a method and apparatus for detecting absolute angular position using a resolver, it has been proposed that excitation is performed by an AC excitation signal when power is supplied, and by a pulse excitation signal backed up by a battery when there is a power outage. A conventional absolute angular position detection method and apparatus of this type can be seen, for example, in the configuration shown in Patent Document 1.

[0003] Here, the absolute angular position detection device described in Patent Document 1 uses a resolver with one-phase excitation and two-phase output. When power is applied, the resolver is excited with one-phase AC, and the calculation circuit processes the one-rotation data from the resolver / digital conversion unit and the multi-rotation count data from the rotation count unit during power application to generate an absolute angular position detection signal indicating a multi-rotation position. On the other hand, during a power outage, the absolute angle position detection device is configured to generate multi-rotation count data during a power outage by exciting the resolver with a single-phase pulse and using the same rotation count unit as when power is supplied. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Patent No. 4709963 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] The absolute position detection device described in Patent Document 1 above can obtain continuous multi-turn count data under both power supply and power outage conditions, but it has the problem of only supporting resolvers with single-phase excitation and two-phase output. In a resolver with single-phase excitation and two-phase output, the imbalance in the amplitude of the two-phase output signals directly becomes an error. Therefore, when using a resolver with single-phase excitation and two-phase output, it is difficult to achieve high-precision absolute angle detection. Therefore, it was desired to achieve absolute angle detection by multi-turn detection compatible with three different resolver types: two-phase excitation and two-phase output, one-phase excitation and two-phase output, and two-phase excitation and one-phase output, as well as to obtain continuous multi-turn count data under both power supply and power outage conditions.

[0006] To solve the above-mentioned problems, the present invention aims to provide an absolute angle position detection method and apparatus that enables absolute angle detection by multi-turn detection compatible with three different types of resolvers: 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-turn count data both when power is supplied and when power is depleted. [Means for solving the problem]

[0007] The absolute angular position detection method according to this invention is a two-phase excitation two-phase output, 1 phase excitation 2An absolute angular position detection method that detects rotation using a resolver of either a single-phase output or a two-phase excitation single-phase output type, wherein when power is supplied when detecting rotation using a two-phase excitation two-phase output resolver, the switching unit 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 multi-rotation count data during power supply are generated from the two-phase resolver signal, an absolute angular position signal is generated from the one-rotation data and multi-rotation count data during power supply, and when there is a power outage when detecting rotation using a two-phase excitation two-phase output resolver, the switching unit is switched to a two-phase excitation The system switches to a 2-phase output power outage state, supplies a 1-phase pulse excitation signal to at least one of the resolver's excitation windings to generate a 2-phase resolver signal, generates power outage multi-turn count data from the 2-phase resolver signal, generates an absolute angular position signal from the power outage multi-turn count data, and when power is supplied for rotation detection using a 1-phase excited 2-phase output resolver, the switching unit switches to a 1-phase excited 2-phase output power supply state, supplies one of the 2-phase AC excitation signals to the resolver to generate a 2-phase resolver signal, generates 1-turn data and power supply multi-turn count data from the 2-phase resolver signal, and generates 1-turn data When detecting rotation using a resolver with 1-phase excitation and 2-phase output, an absolute angular position signal is generated from the multi-turn count data during power supply, and the switching unit is switched to a 1-phase excitation, 2-phase output power-off state during a power outage, and a 1-phase pulse excitation signal is supplied to the resolver to generate a 2-phase resolver signal, and multi-turn count data during power outage is generated from the 2-phase resolver signal, and an absolute angular position signal is generated from the multi-turn count data during power outage, and the switching unit is switched to a 2-phase excitation, 1-phase output power-on state during power supply, and a 2-phase AC excitation signal is supplied to the resolver to generate a 1-phase A resolver signal is generated, one rotation data and energized multi-rotation count data are generated from the one-phase resolver signal, an absolute angular position signal is generated from the one rotation data and energized multi-rotation count data, and in the event of a power outage when rotation is detected by a two-phase excited one-phase output resolver, the switching unit is switched to a two-phase excited 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, multi-rotation count data during power outage is generated from the two-phase resolver signal, and an absolute angular position signal is generated from the multi-rotation count data during power outage.

[0008] The absolute angle position detection device according to this invention comprises a signal processing unit and a switching unit, and has two-phase excitation and two-phase output. 1 phase excitation 2An absolute angular position detection device that detects rotation using a resolver of either a single-phase output or a two-phase excitation single-phase output type, wherein the switching unit switches to a two-phase excitation two-phase output energized state when energized for rotation detection using a two-phase excitation two-phase output resolver, the signal processing unit supplies a two-phase AC excitation signal to the resolver via the switching unit, receives the two-phase resolver signal generated by the resolver via the switching unit, generates one-rotation data and energized multi-rotation count data from the two-phase resolver signal, generates an absolute angular position signal from the one-rotation data and energized multi-rotation count data, and the switching unit is two-phase When rotation detection is performed using a resolver with two-phase excitation output, the system switches to a two-phase excitation, two-phase output power-off state during a power outage. 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 the two-phase resolver signal generated by the resolver via the switching unit, generates multi-turn count data during power outages from the two-phase resolver signal, and generates an absolute angular position signal from the multi-turn count data during power outages. When power is supplied when rotation detection is performed using a resolver with one-phase excitation, two-phase output, the system switches to a one-phase excitation, two-phase output power-on state. The signal processing unit receives the two-phase pulse excitation signal via the switching unit. One phase AC excitation signal is supplied to the excitation winding of the resolver, the two-phase resolver signal generated by the resolver is received via the switching unit, one-rotation data and multi-rotation count data during energization are generated from the two-phase resolver signal, and an absolute angular position signal is generated from the one-rotation data and multi-rotation count data during energization. The switching unit switches to a one-phase excitation two-phase output power outage state when there is a power outage while rotation is detected by a one-phase excitation two-phase output resolver, the signal processing unit supplies a one-phase pulse excitation signal to the resolver via the switching unit, the two-phase resolver signal generated by the resolver is received via the switching unit, and the two-phase The switch unit generates multi-turn count data during power outages from the resolver signal, generates an absolute angular position signal from the multi-turn count data during power outages, and switches to a two-phase excitation, one-phase output energized state when power is supplied for rotation detection by a two-phase excitation, one-phase output resolver, the signal processing unit supplies a two-phase AC excitation signal to the resolver via the switch unit, receives the one-phase resolver signal generated by the resolver via the switch unit, generates one-turn data and multi-turn count data during energization from the one-phase resolver signal, generates an absolute angular position signal from the one-turn data and multi-turn count data during energization, and the switch unit,When detecting rotation by a resolver with two-phase excitation and one-phase output during a power outage, it switches to a two-phase excitation one-phase output power outage state, and the signal processing unit supplies a one-phase pulse excitation signal to the detection winding of the resolver via the switching unit, receives the two-phase resolver signal generated by the resolver and output from the excitation winding via the switching unit, 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.

[0009] In this invention, it further includes a monitoring unit for monitoring the power supply state and the resolver method. The monitoring unit switches the connection of the switching unit according to whether the resolver is of which method and whether the power supply state is during power-on or power-off.

[0010] In this invention, the signal processing unit has a first signal processing unit that receives the supply of the power-on operating power supply and executes processing during power-on, and a second signal processing unit that receives the supply of the power-on operating power supply and executes processing, and receives the supply of the backup power supply and executes processing during a power outage.

[0011] In this 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 an arithmetic unit. The arithmetic unit generates an absolute angle position signal from the one-rotation data and the power-on multi-rotation count data during power-on, and generates an absolute angle position signal from the power outage multi-rotation count data during a power outage.

Advantages of the Invention

[0013] According to this invention, absolute angle detection is realized by multi-rotation detection corresponding to three different methods of two-phase excitation two-phase output, one-phase excitation two-phase output, and two-phase excitation one-phase output, and continuous multi-rotation count data can be obtained during power-on and power-off.

Brief Description of the Drawings

[0014] [Figure 1] It is a configuration diagram showing the configuration of the absolute angle position detection device of Embodiment 1. [Figure 2] It is an explanatory diagram showing, in a list format, how the connection state to the resolver of each method in the absolute angle position detection device of Embodiment 1 is switched. [Figure 3] It is a configuration diagram showing the connection of the two-phase excitation two-phase output energization state when energizing with a resolver of two-phase excitation two-phase output in the absolute angle position detection device of Embodiment 1. [Figure 4] It is a configuration diagram showing the connection of the two-phase excitation two-phase output power-off state when powering off with a resolver of two-phase excitation two-phase output in the absolute angle position detection device of Embodiment 1. [Figure 5] It is a configuration diagram showing the connection of the one-phase excitation two-phase output energization state when energizing with a resolver of one-phase excitation two-phase output in the absolute angle position detection device of Embodiment 1. [Figure 6] It is a configuration diagram showing the connection of the one-phase excitation two-phase output power-off state when powering off with a resolver of one-phase excitation two-phase output in the absolute angle position detection device of Embodiment 1. [Figure 7] It is a configuration diagram showing the connection of the two-phase excitation one-phase output energization state when energizing with a resolver of two-phase excitation one-phase output in the absolute angle position detection device of Embodiment 1. [Figure 8] It is a configuration diagram showing the connection of the two-phase excitation one-phase output power-off state when powering off with a resolver of two-phase excitation one-phase output in the absolute angle position detection device of Embodiment 1. [Figure 9] It is an explanatory diagram showing the phase relationship between the excitation signal and the resolver signal during the absolute angle position detection process of Embodiment 1. [Figure 10] It is an explanatory diagram showing the phase relationship between the excitation signal and the resolver signal during the absolute angle position detection process of Embodiment 1.

Embodiments for Carrying out the Invention

[0015] Hereinafter, embodiments of the absolute angle position detection method and the absolute angle position detection device of the present invention will be described with reference to the drawings.

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

[0017] [Configuration of absolute angle position detection device 100] In Figure 1, the absolute angle position detection device 100 that performs the absolute angle position detection method mainly comprises 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 angle position detection device 100 is configured to support three different types of resolvers: two-phase excitation with two-phase output, one-phase excitation with two-phase output, and two-phase excitation with one-phase output. The absolute angle position detection device 100 includes a resolver 1 of one of three different types, specifically a resolver 1A with two-phase excitation and two-phase output. 1 phase excitation 2 Either a phase-output resolver 1B or a two-phase excitation, one-phase output resolver 1C is connected. The absolute angle position detection device 100 receives power from a power supply (not shown) when energized, and from a backup power supply (not shown) when there is a power outage. The backup power supply is a limited power source, such as a battery, for use during power outages.

[0019] The monitoring unit 110 includes a power supply monitoring unit 110a and a resolver-type monitoring unit 110b. The power supply monitoring unit 110a monitors the status of the power supply for motor operation, that is, whether it is powered on or powered off. The power supply monitoring unit 110a generates a power on / off switching control signal that changes the switching state of the switching unit 120 depending on whether it is powered on or powered off, and supplies the generated power on / off switching control signal to the switching unit 120. Here, "powered on" means when the power supply for motor operation is active, and "powered off" means when the power supply for motor operation is inactive and the backup power supply is active. The resolver method monitoring unit 110b monitors which of the three different types of resolvers—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 an external source, or it may recognize the resolver method from the resolver model number or model identification markings. The resolver method monitoring unit 110b generates a resolver method switching control signal that changes the switching state of the switching unit 120 according to the connected resolver method, and supplies the generated resolver method switching control signal to the switching unit 120.

[0020] Based on the power supply / power off switching control signal and resolver method switching control signal from the monitoring unit 110, the switching unit 120 switches to a 2-phase excited 2-phase output powered state when power is supplied for rotation detection using a 2-phase excited 2-phase output resolver 1, switches to a 2-phase excited 2-phase output powered state when there is a power outage

[0021] The switching unit 120 may switch based on a specific state specified by an on / off switching control signal and a resolver-type switching control signal, or it may switch by reading a switching state held in memory or the like based on the on / off switching control signal and the resolver-type switching control signal. Furthermore, a switching control unit may be provided to control the state of the switching unit 120. The switching unit 120 connects and disconnects each part based on the power supply / power off switching control signal and the resolver type switching control signal. To do this, an analog switch such as a MOS-FET (Metal-Oxide-Semiconductor Field-Effect Transistor) capable of switching resistance or impedance may be used, or a buffer circuit capable of switching to high impedance output may be connected between each part, and the buffer circuit may be 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. The first signal processing unit 130 receives a power supply for the electric motor and operates when power is applied.

[0023] The resolver / digital conversion unit 131 receives a resolver signal from the resolver 1 and generates one-rotation data by processing the supplied resolver signal. 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 90° out of phase with respect to each other. When power is applied, the generated two-phase AC excitation signals are supplied to the excitation phase of the resolver 1 via the switching unit 120. 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 the rotational speed count unit 142 in the second signal processing unit 140, which will be described later.

[0024] The second signal processing unit 140 is equipped with a pulse excitation unit 141 and a rotation speed count unit 142. The second signal processing unit 140 receives power from both the power supply and the backup power supply and operates continuously during both power supply and power outages.

[0025] The pulse excitation unit 141 is driven by a backup power supply during a power outage and generates a single-phase pulse excitation signal. The generated single-phase pulse excitation signal is supplied to the rotation speed count unit 142 during a power outage and also supplied to the excitation phase of the resolver 1 via the switching unit 120. The rotational speed counting unit 142 operates both when power is supplied and when there is a power outage. Specifically, when power is supplied, the rotational speed counting unit 142 uses a two-phase timing signal and a resolver signal to generate multi-rotation count data for power supply. When there is a power outage, the rotational speed counting unit 142 uses a one-phase pulse excitation signal and a resolver signal to generate multi-rotation count data for power outages.

[0026] The calculation unit 150 is supplied with power for motor operation when energized and performs calculations using the 1-rotation data from the first signal processing unit 130 and the multi-rotation count data during energization from the second signal processing unit 140. As a result of the calculation, the calculation unit 150 generates an absolute angular position signal indicating the multi-rotation position. In the event of a power outage, the calculation unit 150 is supplied with backup power and generates an absolute angular position signal by receiving the multi-rotation count data during a power outage from the rotation count unit 142.

[0027] Here, the switching state in the connection inside the switching unit 120 will be explained with reference to Figure 2. Figure 2 is an explanatory diagram that shows in a list format the switching state of the connection with each type of resolver in the absolute angle position detection device 100 of Embodiment 1. The switching unit 120 performs switching according to a total of six connection states, consisting of three methods and two states each, based on the power supply / power off switching control signal and resolver method switching control signal from the monitoring unit 110. The following explanation, referring to the explanatory diagram in Figure 2 and the explanatory diagrams of each connection state in Figures 3 to 8, describes how absolute angle detection is achieved through multi-turn detection corresponding to three different types of resolvers, and how continuous multi-turn count data is obtained under both power-on and power-off conditions, for each connection state.

[0028] [Two-phase excitation, two-phase output energized state] Referring to Figures 2 and 3, the state of the switching unit 120 when rotation is detected by a two-phase excitation two-phase output resolver 1 (hereinafter, the two-phase excitation two-phase output resolver 1 will simply be referred to as "resolver 1A") when power is supplied (hereinafter, this will be referred to as the "two-phase excitation two-phase output power supply state").

[0029] Based on the power supply / power off switching control signal and resolver method switching control signal from the monitoring unit 110, the switching unit 120 connects each part as follows in a two-phase excitation two-phase output power supply state. 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-phase output phase 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-phase output phase 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 rotational speed count unit 142. As a result, the two-phase resolver signal generated by the resolver 1A through two-phase excitation is supplied to the resolver / digital conversion unit 131 and the rotational speed count unit 142 via the switching unit 120.

[0031] The two-phase excitation, two-phase output resolver 1A, when excited using two-phase AC excitation signals of sinωt and cosωt, outputs a phase-modulated signal as the resolver signal, which has a phase change according to the angle θ of the rotation axis 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 resolver 1A, the two excitation phases A and B that receive the two-phase AC excitation signal are assumed to be formed by excitation windings R1 and R3 for excitation phase A, and by excitation windings R2 and R4 for excitation phase B. Furthermore, in resolver 1A, the output phases A and B that output the two-phase resolver signal are assumed to be formed by detection windings S1 and S3 for output phase A, and by detection windings S2 and S4 for output phase B. In this case, the following output voltage equations (a1) to (a4) hold for resolver 1A when energized. Here, E is the voltage, K is the transformation ratio, θ is the angle of resolver 1A, and ω is the excitation angular frequency. For the sake of simplicity, the double-angle factor is set to 1. Excitation phase A:E R1-R3 =Ecosωt …(a1) Excitation phase B:E R2-R4 =Esinωt …(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·Esin(ωt-θ) …(a4)

[0033] As shown by the output voltage equations (a3) ​​and (a4) above, the output signal of the two-phase excitation two-phase output resolver 1A is a phase-modulated signal. This phase-modulated signal is obtained as a result of combining amplitude-modulated signals of excitation signals, each with equal voltage but shifted phase. Therefore, assuming that resolver 1A is excited using only one of the excitation phases, the same amplitude-modulated signal as the resolver signal with one-phase excitation and two-phase output will be obtained, as will be described later. Thus, the absolute angular position detection method performed in the absolute angular position detection device 100 of Embodiment 1 actively utilizes the characteristic property that resolver 1A can use both two-phase excitation and two-phase output and one-phase excitation and two-phase output in combination.

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

[0035] Here, with reference to Figure 9, the phase relationship of the resolver signal in resolver 1A will be explained. Figure 9 is an explanatory diagram showing the phase relationship between the excitation signal and the resolver signal during absolute angle position detection processing in Embodiment 1. In Figure 9, the phase relationship between the excitation signal and the resolver signal for each resolver angle is shown when resolver 1A is excited by a two-phase AC excitation signal. Figure 9 shows that for each quadrant of the angle of resolver 1A—0° to 90°, 90° to 180°, 180° to 270°, and 270° to 360°—the phase of each resolver signal for each excitation signal can be divided into four different combinations. Here, a resolver signal phase of 0° to +180° relative to the reference excitation signal is defined as "leading." Conversely, a resolver signal phase of -180° to 0° relative to the reference excitation signal is defined as "lagging." From the combination of "leading" and "lagging" states in Figure 9, it is possible to determine the quadrant, and it is clear that the A-phase signal and B-phase signal in the conventional technology can be generated. Therefore, when energized, the rotational speed count unit 142 can generate A-phase / B-phase energized multi-turn count data from the two-phase resolver signal and the two-phase timing signal generated from the two-phase AC excitation signal in the timing unit 133.

[0036] The following describes the signal processing for detecting the rotation of the resolver 1A, which has a two-phase excitation and two-phase output, when power is applied. The resolver / digital conversion unit 131 digitally converts the two-phase resolver signal supplied from the resolver 1A to generate one-rotation data. The resolver / digital conversion unit 131 supplies the generated one-rotation 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 the rotational speed count unit 142 in the second signal processing unit 140. The rotational speed counting unit 142 receives a two-phase resolver signal from the resolver 1A and a two-phase timing signal from the timing unit 133, and uses the two-phase timing signal and the two-phase resolver signal to generate A-phase / B-phase energized multi-revolution count data.

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

[0038] [Two-phase excitation, two-phase output, power outage condition] Referring to Figures 2 and 4, the state of the switching unit 120 when rotation is detected by the two-phase excitation two-phase output resolver 1A during a power outage (hereinafter referred to as the "two-phase excitation two-phase output power outage state") will be explained.

[0039] Based on the power supply / power off switching control signal and resolver method switching control signal from the monitoring unit 110, the switching unit 120 connects each part as follows in a two-phase excitation two-phase output power off state. The switching unit 120 connects the pulse excitation unit 141 with the excitation phases A and B of the resolver 1A. As a result, the 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 be connected to either the pulse excitation unit 141 or either of the excitation phases A or B of the resolver 1A.

[0040] The switching unit 120 connects output phases A and B of resolver 1A to the rotational speed count unit 142. As a result, the two-phase resolver signal generated by resolver 1A through pulse excitation is supplied to the rotational speed count unit 142 via the switching unit 120. As a result, resolver 1A is pulse-excited with at least one of its two excitation phases A and B, generating a two-phase resolver signal. The rotational speed count unit 142 is driven by a backup power supply and receives the two-phase resolver signal generated by resolver 1A and the pulse excitation signal. It processes the two-phase resolver signal with the pulse width of the pulse excitation signal to generate multi-turn count data for use during power outages. The calculation unit 150 receives multi-turn count data from the rotation speed count unit 142 during a power outage and performs calculations. That is, during a power outage, if at least one of the two excitation phases is pulse-excited, the resolver signal from the resolver 1A is output as an amplitude-modulated signal. Therefore, multi-turn count data during a power outage can be generated by processing in the same way as in the conventional technology. As a result of the calculation, the calculation unit 150 generates an absolute angular position signal from the multi-turn count data during a power outage from the rotation speed count unit 142.

[0041] During a power outage, if the two-phase excitation phases A and B of the resolver 1A are excited with the same pulse excitation signal having the same voltage and phase, the resolver signal is generated as an amplitude-modulated signal. Therefore, power outage multi-rotation count data can be obtained by the same processing as that of a conventional one-phase excitation two-phase output resolver. Regarding the one-phase pulse excitation signal and the two-phase resolver signal in the resolver 1A during a power outage, when the Ecosωt and Esinωt of the two-phase AC excitation signal in the above output voltage equations (a1) to (a4) are replaced with the pulse excitation signal f(t), the following output voltage equations (a5) to (a8) are established. Here, E represents voltage, K represents the transformation ratio, and θ represents the angle of the resolver 1A. For ease of explanation, the double angle number is set to 1. 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 position of the two-phase resolver signal generated as the output phase A and the output phase B is shifted by 45° from the actual resolver angle. However, it can be addressed by taking the 45° shift into account and correcting it when generating power outage multi-rotation count data in advance in the rotation count unit 142. To perform two-phase in-phase excitation of the two-phase excitation phases A and B with the same pulse excitation signal f(t), there are a method of connecting the two-phase excitation phases A and B in parallel and performing two-phase in-phase excitation with the pulse excitation signal f(t), and a method of connecting the two-phase excitation phases A and B in series and performing two-phase in-phase excitation with the pulse excitation signal f(t).

[0043] When 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, equations (a7) and (a8) of the output voltage equation described above 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, the immunity to noise is improved, and in other words, the signal-to-noise ratio is improved. On the other hand, since the two excitation phases A and B generally have equivalent impedances, when the two excitation phases A and B are connected in series and excited in phase by a pulse excitation signal f(t) from the pulse excitation unit 141, the two excitation phases can be excited with the same pulse excitation signal. In this case, the excitation voltage generated for each of the two excitation phases is halved by voltage division. That is, while maintaining the same resolver signal level as before, it becomes possible to further reduce the total excitation current of the two excitation phases A and B to about half, thereby suppressing the overall current consumption of the circuit.

[0044] The following describes the signal processing for detecting the rotation of a two-phase excitation, two-phase output resolver 1A during a power outage. 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 count unit 142. The rotation speed counting unit 142 receives the two-phase resolver signal generated in the resolver 1A and the 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 power outages. The calculation unit 150 receives multi-rotation count data from the rotation count unit 142 during a power outage, performs calculations, and generates an absolute angular position signal.

[0045] As described above, in resolver 1A, the rotational speed count unit 142 is shared during both energization and power outages, and by performing continuous multi-rotation detection throughout both energization and power outages, it becomes possible to perform continuous multi-rotation detection without interruption. Furthermore, during power outages, the current consumption during power outages can be reduced by pulse-exciting the excitation phase of resolver 1A.

[0046] [1-phase excitation, 2-phase output energized state] Referring to Figures 2 and 5, the state of the switching unit 120 when rotation is detected by a one-phase excited two-phase output resolver 1 (hereinafter, the one-phase excited two-phase output resolver 1 will simply be referred to as "resolver 1B") when power is supplied (hereinafter, this will be referred to as the "one-phase excited two-phase output power supply state").

[0047] Based on the power supply / power off switching control signal and resolver method switching control signal from the monitoring unit 110, the switching unit 120 connects each part as follows in a 1-phase excitation 2-phase output power supply state. The switching unit 120 connects either the sine or cosine side of the two-phase AC excitation output of the AC excitation unit 132 to the excitation phase of the resolver 1B. Figure 5 shows an example where 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, one phase of the two-phase AC excitation signal from the first signal processing unit 130 is supplied to one of the excitation phases of the resolver 1B via the switching unit 120.

[0048] The switching unit 120 connects the output phase A of the resolver 1B to the sin-side input of the resolver / digital conversion unit 131, and connects the output phase B of the resolver 1B to the cos-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 1B to the input of the rotational speed count unit 142. As a result, the two-phase resolver signal generated by the resolver 1B through single-phase excitation is supplied to the resolver / digital conversion unit 131 and the rotational speed count unit 142 via the switching unit 120.

[0049] The following describes the signal processing for detecting the rotation of resolver 1B, which has a single-phase excitation and two-phase output, when power is applied. When resolver 1B is AC-excited by one of the two phases of the two-phase AC excitation signal, it generates a two-phase resolver signal corresponding to the angle θ of the rotation axis of resolver 1B. The resolver / digital conversion unit 131 receives a two-phase resolver signal from the resolver 1B and generates one-rotation data. The resolver / digital conversion unit 131 then supplies the generated one-rotation 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 the rotational speed count unit 142 in the second signal processing unit 140. When energized, the rotational speed counting unit 142 receives a two-phase resolver signal from the resolver 1B and a two-phase timing signal from the timing unit 133, and uses the two-phase timing signal and the two-phase resolver signal to generate A-phase / B-phase multi-revolution count data when energized.

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

[0051] [Single-phase excitation, two-phase output, power outage state] Referring to Figures 2 and 6, the state of the switching unit 120 when rotation is detected by the resolver 1B with one-phase excitation and two-phase output during a power outage (hereinafter referred to as the "one-phase excitation, two-phase output power outage state") will be explained.

[0052] Based on the power supply / power off switching control signal and resolver method switching control signal from the monitoring unit 110, the switching unit 120 connects each part as follows in a 1-phase excitation 2-phase output power off state. The switching unit 120 connects the pulse excitation unit 141 and the excitation phase of the resolver 1B. As a result, a single-phase pulse excitation signal from the pulse excitation unit 141 is supplied to the excitation phase of the resolver 1B via the switching unit 120. The switching unit 120 connects output phases A and B of the resolver 1B to the rotational speed count unit 142. As a result, the two-phase resolver signal generated by the resolver 1B by pulse excitation is supplied to the rotational speed count unit 142 via the switching unit 120.

[0053] The following describes the signal processing for detecting the rotation of resolver 1B, which has a single-phase excitation and two-phase output, during a power outage. 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 speed count unit 142. The rotation speed count unit 142 receives the two-phase resolver signal generated in the resolver 1B and the 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-turn count data during power outages. The calculation unit 150 receives multi-rotation count data from the rotation count unit 142 during a power outage and outputs an absolute angular position signal.

[0054] As described above, in resolver 1B, the rotational speed count unit 142 is shared both when power is supplied and when power is depleted. Therefore, continuous multi-rotation detection is performed throughout both power-supply and power-depletion conditions, enabling uninterrupted and continuous multi-rotation detection. Furthermore, during power outages, the current consumption during power outages can be reduced by pulse-exciting the excitation phase of resolver 1B.

[0055] [2-phase excitation, 1-phase output energized state] Referring to Figures 2 and 7, the state of the switching unit 120 when rotation is detected by a two-phase excitation one-phase output resolver 1 (hereinafter, the two-phase excitation one-phase output resolver 1 will simply be referred to as "resolver 1C") when power is applied (hereinafter, this will be referred to as the "two-phase excitation one-phase output powered state").

[0056] Based on the power supply / power off switching control signal and resolver method switching control signal from the monitoring unit 110, the switching unit 120 connects each part as follows in a 2-phase excitation 1-phase output power supply state. The switching unit 120 connects the sin 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 cos 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] The switching unit 120 connects the output phase of one phase of the resolver 1C to the sin-side input of the resolver / digital conversion unit 131. Alternatively, the switching unit 120 may connect the output phase of one phase of the resolver 1C to the cos-side input of the resolver / digital conversion unit 131. Furthermore, the switching unit 120 connects the output phase of the resolver 1C to the input of the rotational speed count unit 142. As a result, the one-phase resolver signal generated by the resolver 1C through two-phase excitation is supplied to the resolver / digital conversion unit 131 and the rotational speed count unit 142 via the switching unit 120.

[0058] When a 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 as the resolver signal, which has a phase change according to the angle θ of the rotation axis of the resolver 1C. This resolver 1C is characterized by its high accuracy compared to a one-phase excitation, two-phase output resolver.

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

[0060] As shown by the output voltage equation (c3) above, the resolver signal, which is the output signal of the two-phase excitation, one-phase output resolver 1C, is a phase-modulated signal. This resolver signal as a phase-modulated signal is obtained as a result of the synthesis of the amplitude-modulated signals of each excitation signal. If we consider resolver 1C as a transformer in which the coupling state of the primary and secondary coils changes with angle, it is possible to use the output phase as the excitation input instead of the output, and the excitation phase as the output. Through this use, as shown in the output voltage equations (c4) to (c6) below, resolver 1C, which is a two-phase excitation, one-phase output type resolver, can be used as a one-phase excitation, two-phase output type resolver. 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 have different values. Therefore, in this embodiment, when using a two-phase excitation, one-phase output resolver 1C, this feature is actively utilized.

[0061] In a two-phase excitation, one-phase output energized state, when resolver 1C is excited by a two-phase AC excitation signal, in equations (c1) and (c2), it is possible to generate multi-turn count data during energization based on the phase relationship of the output phase with respect to each excitation phase. Here, with reference to Figure 10, the phase relationship of the resolver signal in resolver 1C will be explained. Figure 10 is an explanatory diagram showing the phase relationship between the excitation signal and the resolver signal during absolute angle position detection processing in Embodiment 1. Figure 10 shows the phase relationship between the excitation signal and the resolver signal for each angle of resolver 1C when resolver 1C, which has two-phase excitation and one-phase output, is excited with two-phase AC. Figure 10 shows that for each quadrant of the angle of resolver 1C, 0° to 90°, 90° to 180°, 180° to 270°, and 270° to 360°, the phase of each resolver signal for each excitation signal can be divided into four types of combinations. Here, a resolver signal phase of 0° to +180° relative to the reference excitation signal is defined as "leading." Conversely, a resolver signal phase of -180° to 0° relative to the reference excitation signal is defined as "lagging." From the combination of "leading" and "lagging" states in Figure 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 rotational speed count unit 142 can generate A-phase / B-phase multi-turn count data from the resolver signal and the two-phase timing signal.

[0062] The following describes the signal processing for detecting the rotation of a two-phase excitation, one-phase output resolver 1C when power is applied. The resolver / digital conversion unit 131 digitally converts the one-phase resolver signal supplied from the resolver 1C to generate one-rotation data, and supplies the generated one-rotation 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 the rotational speed count unit 142 in the second signal processing unit 140. The rotational speed counting unit 142 receives a one-phase resolver signal from the resolver 1C and a two-phase timing signal from the timing unit 133, and uses the two-phase timing signal and the resolver signal to generate A-phase / B-phase energized multi-revolution count data. When power is applied, the calculation unit 150 receives one-rotation data from the resolver / digital conversion unit 131 and A-phase / B-phase multi-rotation count data from the rotation count unit 142 and performs calculations. As a result of the calculations, the calculation unit 150 generates an absolute angular position signal indicating the multi-rotation position for the rotation of the resolver 1C.

[0063] [Two-phase excitation, one-phase output, power outage state] Referring to Figures 2 and 8, the state of the switching unit 120 when rotation is detected by the resolver 1C with two-phase excitation and one-phase output during a power outage (hereinafter referred to as the "two-phase excitation, one-phase output power outage state") will be explained.

[0064] The switching unit 120 is connected in such a way that it swaps the excitation phase and output phase of the resolver 1C in a two-phase excitation, one-phase output power outage state. That is, based on the power supply / power outage switching control signal and the resolver method switching control signal from the monitoring unit 110, the switching unit 120 connects each part as follows in a two-phase excitation, one-phase output power outage state. 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 the 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. Furthermore, the switching unit 120 connects the two excitation phases A and B of the resolver 1C to the rotational speed count unit 142. Here, the two excitation phases of the resolver 1C are used as the 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 rotational speed count unit 142 via the switching unit 120.

[0065] During a power outage, if the detection windings (S1-S3) of the output phase of resolver 1C are used as the excitation phase and excited with a pulse excitation signal, the excitation windings (R1-R3 / R2-R4) of the two-phase excitation phases A and B will act as output phases, and an amplitude-modulated signal corresponding to the sensor angle will be output. Therefore, by swapping the connections between the excitation winding and the detection winding to the absolute angle position detection device 100, multi-turn count data during a power outage can be obtained using the same processing as with single-phase pulse excitation. In resolver 1C during a power outage, the output voltage equation when the pulse signal is f(t) can be expressed as follows by substituting cosωt and sinωt with f(t) in (c5)~(c6) described above for the energized state. 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 single-phase output resolver, multi-turn counting can be performed even during a power outage by using the amplitude-modulated resolver output signals (c8) and (c9) generated in the excitation coil as phase acquisition signals.

[0066] The following describes the signal processing for detecting the rotation of a two-phase excitation, one-phase output resolver 1C during a power outage. The resolver 1C is pulse-excited by a pulse excitation signal supplied to the detection winding as the excitation phase, and outputs the generated two-phase resolver signal from the two-phase excitation winding as the output phase. The resolver 1C supplies the two-phase resolver signal output from the excitation winding to the rotational speed count unit 142. The rotational speed counting unit 142 receives the two-phase resolver signal generated in the resolver 1C and the 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 power outages. The calculation unit 150 receives multi-rotation count data from the rotation count unit 142 during a power outage, performs calculations, and generates an absolute angular position signal.

[0067] As described above, in resolver 1C, the rotational speed count unit 142 is shared both when power is supplied and when power is depleted. By performing continuous multi-rotation detection throughout both power-supply and power-depletion conditions, it becomes possible to perform continuous multi-rotation detection without interruption. Furthermore, during power outages, the output phase of resolver 1C is used as the excitation phase, and pulse excitation is performed to reduce current consumption during power outages.

[0068] [Effects obtained by the embodiment] According to the absolute angle position detection device 100 and absolute angle position detection method described in Embodiment 1, it is possible to use three different types of resolvers 1 (1A, 1B, and 1C): two-phase excitation with two-phase output, one-phase excitation with two-phase output, and two-phase excitation with one-phase output. As described below, absolute angle detection is achieved by multi-turn detection, and continuous multi-turn count data can be obtained both when power is supplied and when power is depleted. In other words, a highly versatile absolute angle position detection device 100 and absolute angle position detection method that are compatible with different types of resolvers 1A, 1B, and 1C can be realized.

[0069] The absolute angle position detection device 100 includes a signal processing unit 101 and a switching unit 120, and has a two-phase excitation two-phase output. 1 phase excitation 2 Rotation is detected by resolvers 1A, 1B, and 1C, which use either a phase output or a two-phase excitation single-phase output method.

[0070] When power is supplied for rotation detection using the two-phase excitation two-phase output resolver 1A, the switching unit 120 switches to the two-phase excitation two-phase output power supply state, the signal processing unit 101 supplies a two-phase AC excitation signal to 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 multi-rotation count data during power supply from the two-phase resolver signal, and generates an absolute angular position signal from the one-rotation data and multi-rotation count data during power supply. When rotation is detected by a resolver 1A with two-phase excitation and two-phase output, during a power outage, the switching unit 120 switches to a two-phase excitation and two-phase output power outage state. 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 the two-phase resolver signal generated by the resolver via the switching unit 120, generates power outage multi-rotation count data from the two-phase resolver signal, and generates an absolute angular position signal from the power outage multi-rotation count data.

[0071] When power 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 powered 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 multi-rotation count data during power application from the two-phase resolver signal, and generates an absolute angular position signal from the one-rotation data and multi-rotation count data during power application. When rotation is detected by a resolver 1B with one-phase excitation and two-phase output, during a power outage, the switching unit 120 switches to a one-phase excitation, two-phase output power outage state. The signal processing unit 101 supplies a one-phase pulse excitation signal to the resolver via the switching unit 120, receives the two-phase resolver signal generated by the resolver via the switching unit 120, generates power outage multi-rotation count data from the two-phase resolver signal, and generates an absolute angular position signal from the power outage multi-rotation count data.

[0072] When power is applied to detect rotation using a two-phase excitation, one-phase output resolver 1C, the switching unit 120 switches to a two-phase excitation, one-phase output powered state. The signal processing unit 101 supplies a two-phase AC excitation signal to the resolver via the switching unit 120, receives the one-phase resolver signal generated by the resolver via the switching unit 120, and generates one-rotation data and multi-rotation count data during power application from the one-phase resolver signal. An absolute angular position signal is generated from the one-rotation data and the multi-rotation count data during power application. When rotation detection is performed by a resolver 1C with two-phase excitation and one-phase output, during a power outage, the switching unit 120 switches to a two-phase excitation, one-phase output power outage state. The signal processing unit 101 supplies a one-phase pulse excitation signal to the resolver's detection winding via the switching unit 120, receives the 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 angular position signal is generated from the power outage multi-rotation count data.

[0073] According to the absolute angle position detection device 100 and absolute angle position detection method described in Embodiment 1, absolute angle detection is achieved by multi-turn detection in response to three different types of resolvers 1A, 1B, and 1C: two-phase excitation two-phase output, one-phase excitation two-phase output, and two-phase excitation one-phase output. Furthermore, it becomes possible to obtain continuous multi-turn count data both when power is supplied and when power is depleted.

[0074] The absolute angle position detection device 100 described in Embodiment 1 further includes a monitoring unit 110 that monitors the power supply status and the type of resolver 1 (1A, 1B, 1C). The monitoring unit 110 switches the connection of the switching unit 120 depending on which type of resolver 1 (1A, 1B, 1C) is and whether the power supply is energized or de-energized. This enables absolute angle detection by multi-turn detection in response to three different types of resolvers 1A, 1B, and 1C, and ensures that continuous multi-turn count data is obtained under both energized and de-energized conditions.

[0075] In the absolute angle position detection device 100 described in Embodiment 1, the signal processing unit 101 includes a first signal processing unit 130 that receives a power supply for motor operation when power is applied and performs processing when power is applied, and a second signal processing unit 140 that receives a power supply for motor operation when power is applied and performs processing when a backup power supply is applied during a power outage. This makes it possible to obtain continuous multi-turn count data both when power is applied and when there is a power outage.

[0076] In the absolute angle position detection device 100 described in Embodiment 1, 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 suitable for both energized and unpowered conditions, and to obtain continuous multi-turn count data for both energized and unpowered conditions.

[0077] In the absolute angle position detection device 100 described in Embodiment 1, the signal processing unit 101 further comprises a calculation unit 150, which generates an absolute angle position signal from single-rotation data and multi-rotation count data during power supply, and generates an absolute angle position signal from multi-rotation count data during power outage. This enables absolute angle detection by multi-rotation detection in response to three different types of resolvers 1A, 1B, and 1C, and ensures that continuous multi-rotation count data is obtained during both power supply and power outage. [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 count unit, 150 calculation unit.

Claims

1. An absolute angular position detection method that detects rotation using a resolver of one of the following types: two-phase excitation and two-phase output, one-phase excitation and two-phase output, When power is supplied for rotation detection using a two-phase excitation two-phase output resolver, the 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 multi-rotation count data during power supply are generated from the two-phase resolver signal, and an absolute angular position signal is generated from the one-rotation data and the multi-rotation count data during power supply. When detecting rotation using a two-phase excitation two-phase output resolver, during a power outage, 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 angular position signal is generated from the power outage multi-rotation count data. When power is supplied for rotation detection using a one-phase excitation two-phase output resolver, the switching unit (120) is switched to a one-phase excitation two-phase output power supply state, one of the two-phase AC excitation signals is supplied to the resolver to generate a two-phase resolver signal, one-rotation data and power supply multi-rotation count data are generated from the two-phase resolver signal, and an absolute angular position signal is generated from the one-rotation data and the power supply multi-rotation count data. When rotation detection is performed by a resolver with one-phase excitation and two-phase output, during a power outage, 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 angular position signal is generated from the power outage multi-rotation count data. When power is supplied for rotation detection using a two-phase excitation one-phase output resolver, the switching unit (120) is switched to a two-phase excitation one-phase output power supply state, a two-phase AC excitation signal is supplied to the resolver to generate a one-phase resolver signal, one-rotation data and power supply multi-rotation count data are generated from the one-phase resolver signal, and an absolute angular position signal is generated from the one-rotation data and the power supply multi-rotation count data. When detecting rotation using a resolver with two-phase excitation and one-phase output, during a power outage, the switching unit (120) is switched to a two-phase excitation, one-phase output power outage state, the 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, power outage multi-rotation count data is generated from the two-phase resolver signal, and an absolute angular position signal is generated from the power outage multi-rotation count data. Absolute angle position detection method.

2. An absolute angle position detection device comprising a signal processing unit (101) and a switching unit (120), which detects rotation using a resolver of one of the following types: two-phase excitation two-phase output, one-phase excitation two-phase output, and two-phase excitation one-phase output, The switching unit (120) switches to a two-phase excitation, two-phase output energized state when energized for rotation detection 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 the two-phase resolver signal generated by the resolver via the switching unit (120), generates one-rotation data and energized multi-rotation count data from the two-phase resolver signal, and generates an absolute angular position signal from the one-rotation data and the energized multi-rotation count data. The switching unit (120) switches to a two-phase excitation, two-phase output power outage state when a power outage occurs while 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 multi-turn count data during power outage from the two-phase resolver signal, and generates an absolute angular position signal from the multi-turn count data during power outage. The switching unit (120) switches to a state of one-phase excitation and two-phase output energization when power is supplied for rotation detection using a one-phase excitation two-phase output resolver. 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 energized multi-rotation count data from the two-phase resolver signal, and generates an absolute angular position signal from the one-rotation data and the energized multi-rotation count data. The switching unit (120) switches to a one-phase excitation two-phase output power outage state when a power outage occurs while 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 multi-turn count data during power outage from the two-phase resolver signal, and generates an absolute angular position signal from the multi-turn count data during power outage. The switching unit (120) switches to a two-phase excitation, one-phase output energized state when power is supplied for rotation detection 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 multi-rotation count data from the one-phase resolver signal, and generates an absolute angular position signal from the one-rotation data and the energized multi-rotation count data. The switching unit (120) switches to a two-phase excitation, one-phase output power outage state when a power outage occurs while rotation detection is performed by a two-phase excitation, one-phase output resolver. 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), generates multi-turn count data during power outage from the two-phase resolver signal, and generates an absolute angular position signal from the multi-turn count data during power outage. Absolute angle position detection device.

3. The system further includes a monitoring unit (110) that monitors the power status and resolver type, The monitoring unit (110) switches the connection of the switching unit (120) depending on which type the resolver is and whether the power supply is energized or de-energized. The absolute angle position detection device according to claim 2.

4. The signal processing unit (101) is, A first signal processing unit (130) receives a power supply for the motor operation when power is applied and performs processing when power is applied, A second signal processing unit (140) that receives power supply for motor operation when power is supplied and performs processing when backup power is supplied during a power outage, The absolute angle position detection device according to claim 2, having the following features.

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. The absolute angle position detection device according to claim 4.

6. The signal processing unit (101) further comprises an arithmetic unit (150), The calculation unit (150) generates an absolute angular position signal from the single rotation data and the multi-rotation count data during power supply when power is supplied, and generates an absolute angular position signal from the multi-rotation count data during power outage when power is supplied. The absolute angle position detection device according to claim 2.

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