JP4709963B2 - Absolute position detection method and apparatus - Google Patents

Description

  The present invention relates to an absolute position detection method and apparatus, and in particular, performs excitation by AC excitation when energized, performs pulse excitation by battery backup during power failure, and shares the rotation speed counting means both during energization and during power failure. The present invention relates to a novel improvement for enabling multi-rotation count data to be detected continuously both during energization and during a power failure.

Conventionally used absolute position detection methods of this type include, for example, configurations shown in Patent Documents 1 to 3.
FIG. 4 shows the configuration of Patent Document 1 among Patent Documents 1 to 3 described above.
4 is a resolver of a single-rotation absolute position detector. A resolver output signal 1a from the resolver 1 is supplied to a commercially available resolver / digital conversion means 2, and this resolver / digital conversion means 2 is provided. The AC excitation signal 4 from the AC excitation means 3 is supplied to the resolver 1 via the switching means 5.

  The switching means 5 is configured to switch to either one based on the normal power supply 7 detected by the power supply monitoring means 6 and the power failure 9 using the backup battery 8 due to a power failure.

  The resolver output signal 1a is inputted to the rotation number counting means 10 driven by the backup battery 8 at the time of the power failure 9, and the pulse excitation signal 12 from the pulse excitation means 11 is supplied to the switching means 5 and the rotation. It is configured to be input to the number counting means 10.

One rotation data 2a from the resolver / digital conversion means 2 is calculated by an arithmetic circuit 21 and an absolute detection signal 22 indicating a multi-rotation position is output.
Further, the multi-rotation count data 10a at the time of power failure from the rotation number counting means 10 is configured to output an absolute detection signal 22 through the arithmetic circuit 21.

Next, the operation will be described. First, normally, at the time of energization 7 in which the DC power source is operating, the power source monitoring means 6 discriminates, and the switching means 5 is switched to the energization time 7.
The AC excitation signal 4 is input to the resolver 1, and the resolver output signal 1a from the resolver 1 is input to the resolver / digital conversion means 2, and is input to the arithmetic circuit 21 as one-rotation data 2a. The absolute detection signal 22 is obtained by being detected by the rotation speed detection circuit.

  Further, at the time of a power failure 9 when the DC power source or the like has a power failure, the switching means 5 is switched to the power failure side indicated by a dotted line, and the pulse excitation signal 12 is input to the resolver 1 instead of the AC excitation signal 4 and is backed up by the backup battery 8. In the driving state, the resolver output signal 1a is processed with the pulse width of the pulse excitation signal 12 by the rotation number counting means 10, and the multi-turn count data 10a at the time of power failure is obtained.

Japanese Patent Laid-Open No. 7-11658 JP-A-5-5629 JP 63-214617 A

Since the conventional absolute position detection method and apparatus are configured as described above, the following problems exist.
That is, rotation speed detection by pulse excitation at the time of power failure is effective in reducing the current consumption of the backup battery, and multi-rotation count data can be obtained, but when energizing, one rotation data from the resolver / digital conversion means is separated. Therefore, the switching timing is complicated and the hardware configuration is complicated and expensive.
Further, in the configurations disclosed in other Patent Documents 2 and 3, although there is no switching between a power failure and energization, a backup of the entire processing circuit is required at the time of a power failure, resulting in an increase in current consumption.

Absolute position detection method according to the invention, the AC excitation signal from the resolver / digital converting means through the switching means is input to one of the resolver when energized, together with obtaining a resolver output signal, from the pulse excitation means at the time of power failure In the absolute position detection method, a pulse excitation signal is input to the resolver via the switching unit, and a resolver output signal and the pulse excitation signal are input to the rotation number counting unit to obtain multi-rotation count data during a power failure. during the energization, the resolver output signal and, said pulse excitation signal, said AC excitation signal inputs the timing signal obtained via the timing circuit to the rotating number counting unit, said rotation number counting means whether et al a phase , Rutotomoni obtain multi-turn count data when conductible of phase B, in the event of a power failure, the switching means is switched to a power failure side, front The pulse excitation signal is input to the resolver instead of the AC excitation signal to enter a backup state, the resolver output signal is processed by the pulse width of the pulse excitation signal by the rotation number counting means, and the multi-turn count data at the time of power failure is obtained. The rotation number counting means is a method for performing continuous multi-rotation detection through energization and power outage by sharing the revolving speed counting means during energization and power outage. a resolver / digital converting means connected to the resolver output signals to resolver is supplied, and switching means connected to the AC excitation means and the resolver of the resolver / digital conversion means, a C from the previous SL AC excitation means the excitation signal through the timing circuit is the resolver output signal and inputs it into a timing signal A rotation number counting means being force, a pulse excitation means for outputting a connected pulse excitation signal to said switching means and the rotation number counting unit, one rotation data and counting the rotational speed from the resolver / digital converter in an absolute position detection apparatus example Bei and an arithmetic circuit for processing by entering the multiple rotation count data and power failure multiple rotation count data when energized from the means, when energized, and the resolver output signal, said pulse excitation signal, the and a timing signal obtained through a timing circuit an AC excitation signal inputted to the rotation number counting unit, said rotation number counting means whether et al a phase, to obtain a multi-rotation count data when conductible phase B Rutotomoni, blackout In some cases, the switching means is switched to the power failure side, and the pulse excitation signal is input to the resolver instead of the AC excitation signal. In the backup state, the resolver output signal is processed with the pulse width of the pulse excitation signal by the rotation speed counting means to obtain multi-rotation count data at the time of power failure, and the rotation speed counting means is shared at the time of energization and power failure. Thus, the multi-rotation detection is continuously performed during energization and power failure.

Since the absolute position detection method and apparatus according to the present invention are configured as described above, the following effects can be obtained.
That is, since the multi-turn count data at the time of energization is obtained by the rotational speed counting means using the timing signal obtained by using the AC excitation signal used at the time of energization, continuous multi-rotation detection is possible through the energization and power failure. .
In addition, since the rotation speed counting means that is originally used at the time of power failure is shared during energization, cost reduction, space saving, and IC integration are easy.
Moreover, since the resolver can be operated by pulse excitation from the pulse excitation means at the time of power failure, the current consumption of the backup battery can be reduced.
Further, a resolver / digital conversion means for obtaining one rotation data can be used as a commercial product, and the cost can be greatly reduced as compared with the development of a custom IC.

  The present invention performs excitation by AC excitation during energization, pulse excitation by battery backup during power failure, and continuously during both energization and power failure by sharing the rotational speed counting means during both energization and power failure. An object is to enable detection of multi-turn count data.

Hereinafter, preferred embodiments of an absolute position detection method and apparatus according to the present invention will be described with reference to the drawings.
In addition, the same code | symbol is attached | subjected and demonstrated to a part the same as that of a prior art example, or an equivalent part.
In Figure 1, those represented by the reference numeral 1 is a single resolver one revolution absolute position detector, the resolver output signal 1a from the resolver 1 is supplied to a commercially available resolver / digital converter 2, the resolver The AC excitation signal 4 from the AC excitation means 3 of the digital conversion means 2 is configured to be supplied to the resolver 1 via the switching means 5.

  The switching means 5 is configured to switch to either one based on when the normal DC power source 8A is energized detected by the power source monitoring means 6 and when there is a power failure 9 using the backup battery 8 due to a power failure.

  The resolver output signal 1a (sin θ · sin ωt, cos θ · sin ωt) is input to the rotation speed counting means 10 driven by the backup battery 8 at the time of the power failure 9, and the pulse excitation signal from the pulse excitation means 11 is input. 12 is input to the switching means 5 and the rotation speed counting means 10.

The AC exciting signal 4 (Vsinomegati) is input before Symbol rotational speed counting means 10 as a pulse-like timing signal 20a through a well-known timing circuits 20 (shown in FIG. 3), a resolver using this timing signal 20a The multi-rotation count data 10b during energization can be obtained from the output signal 1a.

One rotation data 2a from the resolver / digital conversion means 2 is calculated by an arithmetic circuit 21 and an absolute detection signal 22 indicating a multi-rotation position is output.
Further, the multi-rotation count data 10a at the time of power failure from the rotation number counting means 10 is configured to output an absolute detection signal 22 through the arithmetic circuit 21.
The rotation number counting means 10 is configured to be able to obtain the multi-rotation count data 10a, 10b at the time of power failure / energization in common at the time of energization 7 and at the time of power failure 9.

  Next, the operation will be described. First, normally, when the DC power supply 8A is in operation, the power supply monitoring means 6 makes a determination, and the switching means 5 is switched to the power supply time 7.

The AC excitation signal 4 is input to the resolver 1, and the resolver output signal 1 a from the resolver 1 is input to the resolver / digital conversion means 2 and input to the arithmetic circuit 21 as one rotation data 2 a.
Further, the AC excitation signal 4 is input to the rotation speed counting means 10 as a timing signal 20a through the timing circuit 20, and according to the timing chart shown in the waveform diagram of FIG. Data 10b is input to the arithmetic circuit 21 and an absolute detection signal 22 is output.

  Further, at the time of a power failure 9 when the DC power source 8A has a power failure, the switching means 5 is switched to the power failure side indicated by a dotted line, and the pulse excitation signal 12 is input to the resolver 1 instead of the AC excitation signal 4, and the backup battery 8 backs up. In the driving state, the resolver output signal 1a is processed with the pulse width of the pulse excitation signal 12 by the rotation number counting means 10, and the multi-turn count data 10a at the time of power failure is obtained.

  The present invention is not limited to a resolver but can be applied to a synchro or the like.

1 is a block diagram illustrating an absolute position detection method and apparatus according to the present invention. It is a time chart which shows the detection timing at the time of electricity supply of FIG. FIG. 3 is a partly enlarged detailed time chart of FIG. 2. It is a block diagram which shows a conventional structure.

DESCRIPTION OF SYMBOLS 1 Resolver 1a Resolver output signal 2 Resolver / digital conversion means 2a 1 rotation data 3 AC excitation means 4 AC excitation signal 5 Switching means 6 Power supply monitoring means 7 Current supply 8 Backup battery 8A DC power supply 9 Power failure 10 Rotation count means 10a Power failure Multi-rotation count data 10b Multi-rotation count data 11 when energized Pulse excitation means 12 Pulse excitation signal 20 Timing circuit 20a Timing signal 21 Arithmetic circuit 22 Absolute detection signal

Claims (2)

AC excitation signal from the energization resolver / digital converting means (7) (2) (4) via the switching means (5) enter into one resolver (1), the resolver output signal (1a) At the time of power failure (9), the pulse excitation signal (12) from the pulse excitation means (11) is input to the resolver (1) via the switching means (5), and the resolver output signal (1a) and In the absolute position detection method in which the pulse excitation signal (12) is input to the rotation number counting means (10) to obtain the multi-turn count data (10a) at the time of power failure.
At the time of energization (7), the resolver output signal (1a), the pulse excitation signal (12), and the timing signal (20a) obtained through the timing circuit (20) the AC excitation signal (4) the input to the rotation number counting means (10), said rotation number counting means (10) or al a phase, B-phase conductible when multiple rotation count data (10b) to give Rutotomoni, in case of power failure (9) The switching means (5) is switched to the power failure side, and the pulse excitation signal (12) is input to the resolver (1) in place of the AC excitation signal (4) to enter a backup state, and the rotational speed count The resolver output signal (1a) is processed by the pulse width of the pulse excitation signal (12) by means (10) to obtain multi-rotation count data (10a) at the time of power failure, and the rotation speed counting means (10) By sharing it during energization (7) and power outage (9), continuous multi-rotation detection can be performed through energization (7) and power outage (9). A method for detecting an absolute position, characterized in that the output is performed. Connected to the resolver output signals to one of the resolver (1) and a resolver / digital converting means (1a) is supplied (2), the AC excitation means of the resolver / digital converting means (2) (3) and said resolver (1) and connected to the switching means (5), the converted before Symbol a C excitation signal (4) via a timing circuit (20) a timing signal from the AC excitation means (13) (20a) The revolution number counting means (10) to which the resolver output signal (1a) is inputted and the pulse excitation signal (12) is output connected to the switching means (5) and the revolution number counting means (10). a pulse excitation means (11) for energization during multiple rotation count data from one rotation data (2a) and the rotation number counting means (10) from said resolver / digital converting means (2) (10b) and power failure in multiple rotation absolute position detecting apparatus example Bei and an arithmetic circuit for processing to input (21) of the count data (10a), when energized ( 7), the resolver output signal (1a), the pulse excitation signal (12), and the timing signal (20a) obtained from the AC excitation signal (4) via the timing circuit (20) enter the count means (10), said rotation number counting means (10) or al a phase, obtained when conductible of B-phase multi-turn count data (10b) Rutotomoni, in case of power failure (9), the switching The means (5) is switched to the power failure side, and the pulse excitation signal (12) is input to the resolver (1) instead of the AC excitation signal (4) to enter the backup state, and the rotation number counting means (10) The resolver output signal (1a) is processed with the pulse width of the pulse excitation signal (12) to obtain multi-rotation count data (10a) at the time of a power failure, and the rotation speed counting means (10) ) And during a power failure (9), it is possible to perform continuous multi-rotation detection through the power supply (7) and the power failure (9). Absolute position detecting apparatus according to claim.

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