JP2023139639A - Absolute angle position detection method and device - Google Patents

Abstract

To obtain multi rotation count data which is continuous in electric conduction and blackout in absolute angle detection by multi rotation detection which uses a two-phase excitation/one phase output resolver.SOLUTION: In electric conduction, one-rotation data is generated by a resolver/digital conversion part (131) from one phase of a resolver signal obtained by two-phase excitation of a resolver (1), and electric conduction time multi-rotation count data is generated by a multi rotation count part (142). In blackout, a one-phase pulse excitation signal is supplied to a detection coil for one-phase excitation of the resolver (1). By a two-phase resolver signal obtained from an excitation coil, the multi rotation count part (142) generates the blackout time multi-rotation count data. The multi rotation count part (142) performs continuous multi rotation detection through the blackout time and electric conduction time, and is shared in the electric conduction time and the blackout time.SELECTED DRAWING: Figure 1

Description

The present invention relates to an absolute angular position detection method and device, and in particular to a two-phase excitation/one-phase output resolver having a two-phase excitation winding and a one-phase detection winding, and which can be used both during power on and during power outage. This invention relates to a novel improvement for continuously detecting multi-rotation count data.

In the absolute angular position detection method and device using a resolver, AC excitation is used when the power is on, and pulse excitation is performed using battery backup during a power outage, so that multi-rotation count data can be continuously obtained both when the power is on and during a power outage. It has been proposed to detect An example of this type of absolute angular position detection device is the configuration shown in Patent Document 1.

The absolute angular position detection device described in Patent Document 1 uses a one-phase excitation/two-phase output resolver.
Here, the absolute angular position detection device excites the resolver with one-phase AC when energized, and calculates one rotation data from the resolver/digital conversion section and multi-rotation count data when energized from the multi-rotation counting section. The circuit calculates and generates an absolute angular position detection signal indicating the multi-rotation position.
On the other hand, in the event of a power outage, the absolute angular position detection device generates a 1-phase pulse excitation signal in a power-saving pulse excitation part so that it can be driven by a backup power source, excites the resolver with a 1-phase pulse, and also The multi-rotation count unit is used to generate multi-rotation count data during a power outage.

Patent No. 4709963

Although the above absolute position detection device described in Patent Document 1 can obtain continuous multi-rotation count data during power on and power outage, it has a problem that it can only be used with resolvers with one-phase excitation/two-phase output. .
That is, a two-phase excitation/one-phase output resolver requires a two-phase excitation signal, and has a problem in that it cannot be excited with a one-phase pulse excitation signal for power saving during a power outage.

In order to solve the above-mentioned problems, the present invention provides continuous multi-rotation count data during power supply and power outage in absolute angle detection by multi-rotation detection using a two-phase excitation/one-phase output resolver. An object of the present invention is to provide a method and apparatus for detecting an absolute angular position.

The absolute angular position detection method according to the present invention is an absolute angular position detection method that performs multi-rotation detection using a 2-phase excitation/1-phase output resolver having a 2-phase excitation winding and a 1-phase detection winding. When energized, the switching section is switched to the energizing side, and the two-phase AC excitation signals generated by the AC excitation section and whose phases are shifted by 90 degrees from each other are input to the two-phase excitation winding of the resolver via the switching section. 2-phase excitation by the converter to obtain a 1-phase resolver signal from the detection winding of the resolver, a step in which the resolver signal is processed in the resolver/digital converter to generate one-rotation data, and a timing unit generates one-phase resolver signal from the AC excitation signal A step of generating a two-phase timing signal, a step of generating multi-rotation count data when energized from the timing signal and a resolver signal in a multi-rotation counting section, and a step of generating one-rotation data and multi-rotation count data when energized in a calculation section. calculating and generating an absolute angular position signal, and in the event of a power outage, the switching section is switched to the power outage side, and the one-phase pulse excitation signal generated by the pulse excitation section is transferred to the one-phase pulse excitation signal generated by the pulse excitation section via the switching section. The step of inputting the pulse excitation signal to the detection winding of the resolver and energizing one phase to obtain a two-phase resolver signal from the excitation winding of the resolver, and generating multi-rotation count data in the event of a power outage from the pulse excitation signal and the resolver signal in the multi-rotation counting section. and a step of calculating multi-rotation count data at the time of power outage in the calculating section to generate an absolute angular position signal.

The absolute angular position detection device according to the present invention is an absolute angular position detection device that performs multi-rotation detection using a 2-phase excitation/1-phase output resolver having a 2-phase excitation winding and a 1-phase detection winding. , an AC excitation section that generates two-phase AC excitation signals whose phases are shifted by 90 degrees from each other, a timing section that generates two-phase timing signals from the AC excitation signals, and a resolver signal output from the resolver that is digitally converted. A resolver/digital conversion section that generates one-rotation data, a pulse excitation section that generates a one-phase pulse excitation signal, a multi-rotation count section that generates multi-rotation count data during energization or multi-rotation count data during power outage, A switching unit that switches the connection to either the side or the power outage side, and a calculation unit that processes one rotation data, multi-rotation count data during energization, and multi-rotation count data during power outage, and when energized, the switching unit: The connection is switched to the energized side, and the resolver inputs an AC excitation signal to the excitation winding via the switching section to perform two-phase excitation, obtains a one-phase resolver signal from the detection winding, and the resolver/digital conversion section: The resolver signal is processed to generate one-rotation data, the multi-rotation count section generates multi-rotation count data when energized from the timing signal and the resolver signal, and the calculation section generates one-rotation data and multi-rotation count data when energized. During a power outage, the switching unit switches the connection to the power outage side, and the resolver inputs a pulse excitation signal to the detection winding via the switching unit to generate one-phase excitation. , a two-phase resolver signal is obtained from the excitation winding, the multi-rotation count section generates multi-rotation count data during a power outage from the pulse excitation signal and the resolver signal, and the calculation section calculates the multi-rotation count data during a power outage. It is characterized in that it generates an absolute angular position signal.

The present invention is characterized in that the pulse excitation section and the multi-rotation counting section are driven by a backup power source in the event of a power outage.

The present invention is characterized in that the multi-rotation counting section is commonly used during energization and power outage, and performs continuous multi-rotation detection both during energization and during power outage.

According to this invention, in absolute angle detection by multi-rotation detection using a two-phase excitation/one-phase output resolver, it is possible to obtain continuous multi-rotation count data during power supply and power outage.

1 is a configuration diagram showing the configuration of an absolute angular position detection device according to Embodiment 1. FIG. FIG. 3 is an explanatory diagram showing the state of a switching section in the absolute angular position detection device according to the first embodiment. FIG. 3 is an explanatory diagram showing a phase relationship between an excitation signal and a resolver signal during absolute angular position detection processing according to the first embodiment. 5 is a flowchart showing a processing procedure of the absolute angular position detection method according to the first embodiment.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an absolute angular position detection method and an absolute angular position detection device according to the present invention will be described below with reference to the drawings.

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

[Configuration of absolute angular position detection device 100]
A phase modulation type two-phase excitation/one-phase output resolver 1 having a two-phase excitation winding and a one-phase detection winding is connected to the absolute angular position detection device 100. The resolver 1 has a property that when the excitation winding is excited with an AC voltage, an AC output voltage is induced in the detection winding.

The absolute angular position detection device 100 mainly includes a power supply monitoring section 110, a switching section 120, a first signal processing section 130, a second signal processing section 140, and a calculation section 150. The absolute angular position detection device 100 receives power from an energizing power source (not shown) when energized, and receives power from a backup power source (not shown) during a power outage. Note that the backup power source is a limited power source that uses a battery or the like as a power source in case of a power outage.

The power source monitoring unit 110 monitors the valid/invalid state of the energizing power source, that is, whether it is energized or out of power. Here, energizing means when the energizing power source is valid, and power outage means when the energizing power source is invalid and the backup power source is valid. The power supply monitoring unit 110 generates a switching control signal that changes the switching state of the switching unit 120 between when electricity is on and when there is a power outage, depending on the monitoring result.

The switching unit 120 switches the connection between when electricity is on and when there is a power outage based on a switching control signal from the power supply monitoring unit 110.
When energized, a two-phase AC excitation signal (hereinafter referred to as a "two-phase AC excitation signal") from the first signal processing section 130 is sent to the resolver 1 via the switching section 120 in the state shown by the solid line in the circuit symbol in FIG. A resolver signal that is supplied to the two-phase excitation winding and output from the one-phase detection winding of the resolver 1 is supplied to the resolver/digital conversion section 131 in the first signal processing section 130 .

During a power outage, the one-phase pulse excitation signal from the pulse excitation section 141 in the second signal processing section 140 is applied to the one-phase detection winding of the resolver 1 via the switching section 120 in the state shown by the broken line in the circuit symbol in FIG. The two-phase resolver signal output from the two-phase excitation winding of the resolver 1 is also supplied to the multi-rotation counting section 142 in the second signal processing section 140 .

In the resolver 1, an excitation winding and a detection winding are wound around each of the teeth of a plurality of stators. When the excitation winding is excited with an AC voltage, an AC output voltage is sent to the detection winding as a resolver signal. It has the property of being induced. Therefore, in a two-phase excitation/one-phase output resolver 1 having a two-phase excitation winding and a one-phase detection winding, by switching the supply of the excitation signal and the output of the resolver signal and connecting the It becomes possible to operate as a one-phase excitation/two-phase output resolver having a phase excitation winding and a two-phase detection winding. Therefore, in the first embodiment, the absolute angular position detecting device 100 uses the property that the two-phase excitation/one-phase output resolver 1 can also operate as one-phase excitation/two-phase output, so that the absolute angular position detection device 100 can be This makes it possible to operate continuously.

The first signal processing section 130 is provided with a resolver/digital conversion section 131, an AC excitation section 132, and a timing section 133. Here, the first signal processing unit 130 receives power from the energizing power supply and operates when energized.

The resolver/digital conversion section 131 is supplied with a one-phase resolver signal from the resolver 1, generates one-rotation data, and supplies the generated one-rotation data to the calculation section 150. Further, the resolver/digital conversion section 131 supplies two-phase excitation data to the AC excitation section 132 for generating a two-phase AC excitation signal.
The AC excitation section 132 receives the two-phase excitation data from the resolver/digital conversion section 131 and generates two-phase AC excitation signals whose phases are shifted by 90 degrees from each other. The generated two-phase AC excitation signal is supplied to the two-phase excitation windings of the resolver 1 via the switching unit 120 when energized.
The timing section 133 generates a two-phase timing signal from the two-phase AC excitation signal and supplies it to a multi-rotation counting section 142 in a second signal processing section 140, which will be described later.

The second signal processing section 140 is provided with a pulse excitation section 141 and a multi-rotation counting section 142. Note that the second signal processing unit 140 receives power from the energizing power source and the backup power source, and operates both during energization and during power outage.

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 multi-rotation counting section 142 during a power outage, and is also supplied to the one-phase detection winding of the resolver 1 via the switching section 120.
The multi-rotation counting unit 142 operates both when electricity is on and when there is a power outage. During energization, the multi-rotation count section 142 generates energized multi-rotation count data from the two-phase timing signal and the one-phase resolver signal. During a power outage, the multi-rotation count section 142 generates multi-rotation count data during a power outage from the one-phase pulse excitation signal and the two-phase resolver signal.

The calculation unit 150 is supplied with power from the energization action power source when energized, and performs calculations based on the single rotation data from the resolver/digital conversion unit 131 and the multi-rotation count data during energization from the multi-rotation counting unit 142. . As a result of the calculation, the calculation unit 150 generates an absolute angular position signal indicating the multi-rotation position. The calculation section 150 is supplied with power from the backup power supply during a power outage, performs calculations using the power outage multi-rotation count data from the multi-rotation counting section 142, and generates an absolute angular position signal.

[Switching state of switching unit 120]
Hereinafter, the switching state of the connections inside the switching unit 120 will be described in detail with reference to FIG. 2. FIG. 2 is an explanatory diagram showing the state of the switching section 120 in the absolute angular position detection device 100 of the first embodiment. FIG. 2(a) shows the state of the switching unit 120 when electricity is on, and FIG. 2(b) shows the state of the switching unit 120 during a power outage.

In FIGS. 2A and 2B, either the two-phase AC excitation signal or the one-phase pulse excitation signal is supplied to the resolver 1 via the switching unit 120. Then, either the one-phase resolver signal or the two-phase resolver signal is output from the resolver 1 via the switching unit 120.

FIG. 2A shows a switching state of connections inside the switching unit 120 when a switching control signal indicating that the energizing power source is valid during energization is received from the power source monitoring unit 110.
In this switching state, a two-phase AC excitation signal from the AC excitation section 132 is supplied to the excitation winding of the resolver 1 via the switching section 120. In the resolver 1, the excitation winding is excited by a two-phase AC excitation signal, and a resolver signal is induced in the detection winding. In this switching state, the resolver signal output from the one-phase detection winding of the resolver 1 is supplied to the resolver/digital conversion section 131 and the multi-rotation counting section 142 via the switching section 120.

FIG. 2B shows a switching state of the connections inside the switching unit 120 when a switching control signal indicating that the energizing power supply is invalid during a power outage is received from the power supply monitoring unit 110.
In this switching state, a pulse excitation signal from the pulse excitation section 141 is supplied to the detection winding of the resolver 1 via the switching section 120. In the resolver 1, a detection winding is excited by a pulse excitation signal, and a resolver signal is induced in the excitation winding. In this switching state, two-phase resolver signals output from the excitation winding that acts as a two-phase detection winding are supplied to the multi-rotation counting section 142 via the switching section 120.

[Absolute angular position detection method]
Next, the absolute angular position detection method executed in the absolute angular position detection device 100 of the first embodiment will be described.

In the first embodiment, the absolute angular position detection device 100 is connected to the two-phase excitation/one-phase output resolver 1, and has a first signal processing section 130 that operates only when energized, and a first signal processing section 130 that operates both when energized and during power outage. The respective functions of the second signal processing section 140 operating in the second signal processing section 140 are made to correspond to the two-phase excitation/one-phase output resolver 1.

That is, the absolute angular position detection device 100 obtains a one-phase resolver signal by exciting the resolver 1 in two phases using a two-phase AC excitation signal when energized. On the other hand, the absolute angular position detection device 100 switches the excitation winding and the detection winding during a power outage, inputs a one-phase pulse excitation signal to the detection winding that acts as the excitation winding, and pulse-excites the resolver 1. As a result, a two-phase resolver signal is obtained in the excitation winding which acts as a detection winding. The above-described control during energization and power outage allows continuous multi-rotation count data to be obtained during energization and power outage.

[When energized: Excitation and resolver signal output]
Hereinafter, a case in which the resolver 1 with two-phase excitation/one-phase output is excited in two phases using a two-phase AC excitation signal during energization will be described in detail.
When the two-phase excitation/one-phase output resolver 1 is excited using the two-phase AC excitation signals of Esinωt and Ecosωt, the resolver 1 transmits a phase modulation signal whose phase changes according to the angle θ of the rotation axis of the resolver 1. Output as a signal.

In the resolver 1, regarding excitation phases A and B that receive a two-phase AC excitation signal, excitation phase A is formed by excitation winding R1 and excitation winding R3, and excitation phase B is formed by excitation winding R2 and excitation winding R4. It is assumed that the output phase for outputting a one-phase resolver signal is formed by the detection winding S1 and the detection winding S2.
In the following equation, the voltage is E, the transformation ratio is K, the angle of the resolver 1 is θ, and the excitation angular frequency is ω.
In this case, the following output voltage equation holds true.
Excitation phase: E _R1-R3 = Ecosωt…(1)
E _R2-R4 = Esinωt …(2)
Output phase: E _S1-S2 = K1 (E _R2-R4・cosNθ−E _R1-R3・sinNθ)
=K1Esin(ωt－Nθ) …(3)

As shown in the above output voltage equation (3), the resolver signal, which is the output signal of the two-phase excitation/one-phase output resolver 1, is a phase modulation signal. This resolver signal as a phase modulation signal is obtained as a result of combining amplitude modulation signals of the respective excitation signals.

[During power outage: Excitation and output with winding replacement]
Hereinafter, when the excitation winding and the detection winding of the resolver 1 are replaced during a power outage and the resolver 1 is excited with an AC excitation signal, the output voltage equation of the resolver 1 is as follows.
Excitation phase: E _S1-S2 = Esinωt…(4)
Output phase: E _R1-R3 = K2EcosNθsinωt…(5)
E _R2-R4 =K2EsinNθsinωt…(6)

K1 and K2 in the above formula are the ratios of the maximum output voltage and the excitation voltage, respectively. As shown in equations (5) and (6), when the excitation winding and detection winding of resolver 1 with 2-phase excitation/1-phase output are swapped, the amplitude modulation is the same as that of the resolver signal with 1-phase excitation/2-phase output. You will get a signal. In the first embodiment, such characteristics are actively utilized.
Therefore, in the event of a power outage, if the one-phase detection winding of the resolver 1 is used as an excitation winding and excited with a pulse excitation signal as shown in equation (4) above, the two-phase detection winding when energized as the detection winding is The phase excitation winding outputs a resolver signal as an amplitude modulation signal, as shown in equations (5) and (6) above.

[Phase relationship of resolver signals]
During energization, if the motor is excited by a two-phase AC excitation signal in equations (1) and (2), it is possible to generate multi-rotation count data during energization based on the phase relationship of the output phase with respect to each excitation phase. be. Here, the phase relationship of resolver signals will be explained with reference to FIG. FIG. 3 is an explanatory diagram showing the phase relationship between the excitation signal and the resolver signal during the absolute angular position detection process according to the first embodiment.

FIG. 3 shows the phase relationship between the excitation signal and the resolver signal for each angle of the resolver 1 when a two-phase excitation/one-phase output resolver is excited with two-phase AC. Figure 3 shows four types of phases of each resolver signal for each excitation signal for each quadrant of the angle of resolver 1: 0° to 90°, 90° to 180°, 180° to 270°, and 270° to 360°. This shows that it can be divided into combinations of. It is possible to determine the quadrant (0° to 90°, 90° to 180°, 180° to 270°, 270° to 360°) from the combination of "advance" and "delay" in Figure 3. , it is clear that the A-phase signal and B-phase signal in the prior art can be generated. Therefore, the multi-rotation counting section 142 can generate A-phase/B-phase multi-rotation count data from the resolver signal and the two-phase timing signals.

[Calculation when energized]
During energization, one rotation data is obtained by the resolver/digital converter 131 using the above equations (1), (2), and (3). The calculation unit 150 performs calculation by combining the single rotation data from the resolver/digital conversion unit 131 and the multi-rotation count data during energization from the multi-rotation count unit 142. As a result of the calculation, the calculation unit 150 can generate an absolute angular position signal based on the single rotation data and the multi-rotation count data during energization.

[Calculation during power outage]
During a power outage, if the 1-phase detection winding when energized is used as the excitation winding and pulsed by an intermittent pulse excitation signal, the amplitude will be reduced from the 2-phase excitation winding when energized, which acts as the output winding. A two-phase resolver signal is output as a modulation signal (see equations (5) and (6) above). Therefore, the multi-rotation count section 142 can obtain multi-rotation count data during a power outage through the same process as in the prior art. The calculation unit 150 can generate an absolute angular position signal based on the power outage multi-rotation count data.

[Processing procedure of absolute angular position detection method]
Next, the absolute angular position detection method, which is the operation of the absolute angular position detection device 100, will be explained with reference to FIG. FIG. 4 is a flowchart showing the processing procedure of the absolute angular position detection method according to the first embodiment. Note that FIG. 4 shows the causal relationship or association of signals when processing various signals, and does not strictly show the time or order of processing. Furthermore, it is possible to execute several processes at the same time, at overlapping timings, or by changing the order.

First, in step S100, the power supply monitoring unit 110 monitors whether the power supply for normal operation is valid or invalid. After this, the process proceeds to step S101.

In step S101, if it is determined that the normal operation power source is valid and energized, the power supply monitoring unit 110 supplies a switching control signal indicating that energization is occurring to the switching unit 120, and the process proceeds to step S111.

In step S111, the connection of the switching unit 120 is switched to the energizing side shown in FIG. 2(a) based on the switching control signal indicating that the current is on. After this, the process proceeds to step S112.

In step S112, the AC excitation unit 132 generates a two-phase AC excitation signal and supplies the generated two-phase AC excitation signal to the two-phase excitation windings of the resolver 1 via the switching unit 120. After this, the process proceeds to step S113.

In step S113, the resolver 1 is excited in two phases and generates a one-phase resolver signal. The resolver 1 supplies the generated one-phase resolver signal to the resolver/digital conversion section 131 and the multi-rotation counting section 142. After this, the process proceeds to step S114 and step S115.

In step S<b>114 , the resolver/digital converter 131 digitally converts the one-phase resolver signal generated by the resolver 1 to generate one-rotation data, and supplies the generated one-rotation data to the calculation unit 150 . After this, the process proceeds to step S117.

In parallel with step S114 above, in step S115, the timing section 133 generates a two-phase timing signal from the two-phase AC excitation signal and supplies it to the multi-rotation counting section 142 in the second signal processing section 140. After this, the process proceeds to step S116.

In step S116, the multi-rotation counting unit 142 receives the one-phase resolver signal from the resolver 1 and the two-phase timing signal from the timing unit 133, and from the two-phase timing signal and the one-phase resolver signal, Generates multi-rotation count data when energized. After this, the process proceeds to step S117.

In step S117, the calculation unit 150 generates an absolute angular position signal by receiving and calculating the single rotation data from the resolver/digital conversion unit 131 and the multi-rotation count data during energization from the multi-rotation counting unit 142. can do. Then, the process returns to step S100, and the process after the power supply determination is repeatedly executed.

In step S101, if it is determined that the power supply for normal operation is invalid and a power outage is occurring, the power supply monitoring unit 110 supplies a switching control signal indicating that a power outage is occurring to the switching unit 120, and the process proceeds to step S121.

In step S121, the connection of the switching unit 120 is switched to the power outage side shown in FIG. 2(b) based on the switching control signal indicating that there is a power outage. After this, the process proceeds to step S122.

In step S122, the pulse excitation unit 141 is driven by the backup power supply to generate a one-phase pulse excitation signal, and supplies the generated one-phase pulse excitation signal to the two-phase detection windings of the resolver 1 via the switching unit 120. do. After this, the process proceeds to step S123.

In step S123, the resolver 1 is excited by the one-phase pulse excitation signal supplied to the detection winding, and generates two-phase resolver signals in the two-phase excitation winding. The resolver 1 outputs the generated two-phase resolver signal from the excitation winding and supplies it to the multi-rotation counting section 142 via the switching section 120. After this, the process proceeds to step S124.

In step S124, the multi-rotation counting section 142 is driven by the backup power source, receives the two-phase resolver signal generated by the resolver 1, and the one-phase pulse excitation signal from the pulse excitation section 141, and receives the two-phase resolver signal. is processed using the pulse width of a single-phase pulse excitation signal to generate multi-rotation count data during a power outage. After this, the process proceeds to step S125.

In step S125, the calculation section 150 receives and calculates the power failure multi-rotation count data from the multi-rotation counting section 142, and generates an absolute angular position signal. Then, the process returns to step S100, and the process after the power supply determination is repeatedly executed.

As described above, since the multi-rotation counting section 142 is shared during energization and power outage, continuous multi-rotation detection can be performed both during energization and during power outage. In addition, in the event of a power outage, the excitation winding and detection winding of the resolver 1 with two-phase excitation/one-phase output are replaced, and the detection winding is pulse-excited with a one-phase pulse excitation signal, so that the excitation winding has two phases. resolver signal is obtained. Furthermore, since pulse excitation is used during a power outage, power consumption can be reduced.

[Effects obtained by the embodiment]
According to the absolute angular position detection device 100 and the absolute angular position detection method described in Embodiment 1, in absolute angle detection by multi-rotation detection using a two-phase excitation/one-phase output resolver, energization is performed as follows. This makes it possible to obtain continuous multi-rotation count data at different times and during power outages.

According to the absolute angular position detecting device 100 and the absolute angular position detecting method of the first embodiment, the resolver 1 with two-phase excitation/one-phase output, which has a two-phase excitation winding and a one-phase detection winding, performs multiple rotations. When performing detection, the switching unit 120 is switched to the energizing side during energization, and the two-phase AC excitation signals generated by the AC excitation unit 132 and having a phase shift of 90° from each other are sent to the resolver 1 via the switching unit 120. It is input to a two-phase excitation winding for two-phase excitation, a one-phase resolver signal is obtained from the detection winding of the resolver 1, and the resolver signal is processed in the resolver/digital converter 131 to generate one rotation data. The timing section 133 generates a two-phase timing signal from the AC excitation signal, the multi-rotation counting section 142 generates multi-rotation count data when energized from the timing signal and the resolver signal, and the calculation section 150 generates one-rotation data and energization. An absolute angular position signal is generated by calculating the rotation count data.
On the other hand, in the event of a power outage, the switching section 120 is switched to the power outage side, and the one-phase pulse excitation signal generated by the pulse excitation section 141 is input to the one-phase detection winding via the switching section 120 to excite one phase. , obtains a two-phase resolver signal from the excitation winding of the resolver 1, generates multi-rotation count data at the time of power outage from the pulse excitation signal and the resolver signal in the multi-rotation counting section 142, and generates multi-rotation count data at the time of power outage in the calculation section 150. Compute the data to generate an absolute angular position signal.

Here, during a power outage, by pulse-exciting the resolver 1 from the detection winding side using a one-phase intermittent pulse excitation signal, a two-phase resolver signal can be obtained on the excitation winding side, and the energization Power consumption can be reduced compared to when The multi-rotation counting unit 142 generates multi-rotation count data during energization when energized and generates multi-rotation count data during power outage during power outage, so that multi-rotation detection is performed continuously during energization and during power outage. Can be done.

During a power outage, the pulse excitation unit 141 and the multi-rotation counting unit 142 are driven by the backup power source, so even if the power supply from the energizing power source is stopped, the excitation of the resolver 1 and the multi-rotation counting unit 142 can be performed. The counting operation can be continued, and it is possible to reliably perform continuous multi-rotation detection both during power on and during power outage.

The multi-rotation counting unit 142 is commonly used during power on and power outage, and by performing continuous multi-rotation detection during power on and power outage, it can continuously detect multiple revolutions without interruption during power on and during power outage. It becomes possible to do so.

1 Resolver, 100 Absolute angular position detection device, 110 Power supply monitoring section, 120 Switching section, 130 First signal processing section, 131 Resolver/digital conversion section, 132 AC excitation section, 133 Timing section, 140 Second signal processing section, 141 Pulse excitation section, 142 Multi-rotation counting section, 150 Arithmetic section.

Claims (6)

An absolute angular position detection method that performs multi-rotation detection using a two-phase excitation/one-phase output resolver (1) having a two-phase excitation winding and a one-phase detection winding,
When energized,
The switching unit (120) is switched to the energizing side, and two-phase AC excitation signals generated by the AC excitation unit (132) with a phase shift of 90° from each other are sent to the resolver (1) via the switching unit (120). inputting the signal into a two-phase excitation winding for two-phase excitation, and obtaining a one-phase resolver signal from the detection winding of the resolver (1);
processing the resolver signal in a resolver/digital converter (131) to generate one rotation data;
generating a two-phase timing signal from the AC excitation signal in a timing section (133);
generating multi-rotation count data when energized from the timing signal and the resolver signal in a multi-rotation counting section (142);
calculating an absolute angular position signal by calculating the one rotation data and the multi-rotation count data during energization in a calculation unit (150);
In the event of a power outage,
switching the switching unit (120) to the power outage side;
A one-phase pulse excitation signal generated by the pulse excitation section (141) is input to the one-phase detection winding via the switching section (120) to excite one phase, and the excitation of the resolver (1) is performed. obtaining the two-phase resolver signals from the windings;
generating multi-rotation count data during power outage from the pulse excitation signal and the resolver signal in the multi-rotation counting section (142);
calculating the power outage multi-rotation count data in the calculation unit (150) to generate the absolute angular position signal;
An absolute angular position detection method characterized by: During a power outage, the pulse excitation section (141) and the multi-rotation counting section (142) are driven by a backup power source.
The absolute angular position detection method according to claim 1, characterized in that: The multi-rotation counting unit (142) is shared during the energization and the power outage, and performs continuous multi-rotation detection throughout the energization and the power outage.
The absolute angular position detection method according to claim 1 or 2, characterized in that: An absolute angular position detection device that performs multi-rotation detection using a two-phase excitation/one-phase output resolver (1) having a two-phase excitation winding and a one-phase detection winding,
an AC excitation unit (132) that generates two-phase AC excitation signals whose phases are shifted by 90 degrees from each other;
a timing unit (133) that generates a two-phase timing signal from the AC excitation signal;
a resolver/digital converter (131) that digitally converts the resolver signal output from the resolver (1) to generate one rotation data;
a pulse excitation unit (141) that generates a one-phase pulse excitation signal;
a multi-rotation count unit (142) that generates multi-rotation count data during energization or multi-rotation count data during power outage;
a switching unit (120) that switches the connection to either the energized side or the power outage side;
an arithmetic unit (150) that processes the one-rotation data, the multiple-rotation count data during energization, and the multiple-rotation count data during power outage;
When energized,
The switching unit (120) switches the connection to the energized side,
The resolver (1) inputs the AC excitation signal to the excitation winding via the switching unit (120) to excite the excitation winding in two phases, and obtains the resolver signal of one phase from the detection winding,
The resolver/digital conversion unit (131) processes the resolver signal to generate the one rotation data,
The multi-rotation count unit (142) generates the multi-rotation count data when energized from the timing signal and the resolver signal,
The calculation unit (150) calculates the one rotation data and the multi-rotation count data during energization to generate an absolute angular position signal,
In the event of a power outage,
The switching unit (120) switches the connection to the power outage side,
The resolver (1) inputs the pulse excitation signal to the detection winding via the switching unit (120) to excite one phase, and obtains the two-phase resolver signal from the excitation winding,
The multi-rotation count unit (142) generates the multi-rotation count data during power outage from the pulse excitation signal and the resolver signal,
The calculation unit (150) calculates the multi-rotation count data during power outage to generate the absolute angular position signal.
An absolute angular position detection device characterized by: The pulse excitation unit (141) and the multi-rotation counting unit (142) are driven by a backup power source in the event of a power outage.
The absolute angular position detection device according to claim 4, characterized in that: The multi-rotation counting unit (142) is shared during the energization and the power outage, and performs continuous multi-rotation detection throughout the energization and the power outage.
The absolute angular position detection device according to claim 4 or 5, characterized in that: