JP2824812B2 - Physical-to-electricity converter detection output transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for transmitting a detection output of a physical quantity-electrical quantity converter, and more particularly to a physical quantity of a physical quantity of an object to be measured which is mounted to be rotated by some driving means. The present invention relates to a physical quantity-to-electricity converter detection output transmission device that appropriately processes the output of a physical quantity-to-electrical quantity converter for converting the output to an electric quantity and then transmits the output to a fixed unit side.

[0002]

2. Description of the Related Art A centrifugal acceleration measuring device rotates a turntable in a horizontal plane, and a measured acceleration converter (hereinafter referred to as an "acceleration converter") is mounted on a periphery of the turntable via a jig.
The turntable is rotated to apply centrifugal acceleration to the acceleration converter on the turntable, and the output characteristics at this time are verified and measured.

In such a centrifugal acceleration measuring device, an induction motor is used as a motor for rotating the turntable, and its rotational force is transmitted via a belt, a multi-stage gearbox, a clutch, and the like. , Brakes are applied.

[0004] In addition, the control of the number of revolutions of the motor is also performed by an open loop system.

On the other hand, the rotation support of the turntable is mechanically supported by a ball bearing.

[0006] With the rotation of the turntable,
The acceleration converter detects the centrifugal acceleration, and the detected output is transmitted to the measurement system via the signal transmission system. As the signal transmission system, since the turntable is rotating and the measurement system is installed at a stationary position, an analog transmission system using mechanical contact using a slip ring and a brush is employed. .

[0007] The detection output via the transmission system is input to the measurement system as an analog signal, converted into a digital signal, and then sent to a central processing unit (hereinafter "CP") via an input / output circuit.
U ").

After a predetermined analysis process is performed by the CPU, the analysis result is displayed on a display device or printed out on a printer.

Further, the power supply to the acceleration converter provided on the turntable is generally performed by a slip ring system.

[0010]

In a conventional centrifugal acceleration measuring device, first, in a rotary drive system of a turntable, an induction motor or the like is used, so that brush sliding noise is generated. There is a drawback that it is mixed in the detection output, and since the drive transmission is performed via a belt, a multi-stage gear box, a clutch, etc., the device becomes large, and vibration is added to the turntable, and accurate It was difficult to provide acceleration to the acceleration transducer.

Also, since the transmission system of the detection output is based on a mechanical analog transmission system using a slip ring or a brush, the detection output of abrasion at a sliding portion, poor contact, and noise accompanying the contact is obtained. Is inevitable.

Further, the supply of electric power to the measuring system is also caused by the use of a slip ring or a brush during sliding, as described above, so that wear is inevitable.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and a first object of the present invention is to detect a physical quantity of a rotating object to be measured and convert it into an electrical quantity by using a detection output of a physical quantity-electric quantity converter. It is an object of the present invention to provide a detection output transmission device of a physical quantity-electric quantity converter that can accurately transmit to a fixed side without generating noise in a signal transmission system when transmitting to a fixed section.

A second object of the present invention is to transmit a predetermined command signal from a fixed portion to a signal adjusting means provided on a rotating object under measurement without noise so that the predetermined command operation can be executed accurately. It is an object of the present invention to provide a device for transmitting a detection output of a physical quantity-electric quantity converter.

[0015]

According to the present invention, in order to achieve the first object, a detected output of a physical quantity-electric quantity converter for detecting a physical quantity of a rotating object to be measured and converting it into an electric signal is provided. A signal adjusting means for receiving and amplifying the signal, a signal processing means for converting a parallel signal obtained by digitally converting a signal output from the signal adjusting means into a serial signal, and then performing a modulation process; A rotary transformer that rotates with the object and transmits the output of the first signal processing means from the rotary unit side to the fixed unit side, and demodulates the signal transmitted to the fixed unit side of the rotary transformer and converts it into a parallel signal And a second signal processing means for performing the following.

Further, in order to achieve the second object, the present invention receives a detection output of a physical quantity-electric quantity converter for detecting a physical quantity of a rotating object to be measured and converting the physical quantity into an electric signal. Amplification function, Calibration value signal output function,
A signal adjusting means having a function of removing an unbalanced component of the bridge circuit, and a first signal for performing a modulation process after converting a parallel signal obtained by digitally converting a signal output from the signal adjusting means into a serial signal Processing means, a rotating transformer rotating with the object to be measured and transmitting the output of the first signal processing means from the rotating part to the fixed part, and demodulating a signal transmitted to the fixed part of the rotating transformer. A second signal processing means for converting the signal into a parallel signal, and a command for generating a command signal such as a calibration value signal output command for controlling the signal adjusting means from the fixed part side and a balance adjustment command for the bridge circuit. Signal generating means, third signal processing means for converting a parallel command signal output from the command signal generating means into a serial signal and then modulating the signal, and the first signal processing means when the command signal is not generated An output signal is transmitted to the second signal processing means via the rotary transformer, and when the command signal is generated, a signal output from the first signal processing means is transmitted to the second signal processing means. Switching means for preventing the transmission of the third signal processing means and transmitting the output of the third signal processing means from the fixed part side of the rotary transformer to the rotating part side; and the switching means transmitted from the fixed part side of the rotary transformer to the rotating part side. Third
And a fourth signal processing means for demodulating and parallel-converting the output signal of the signal processing means and outputting the converted signal to the signal adjusting means.

[0017]

The physical quantity of the object to be measured rotated by a driving means such as a brushless motor is detected on the input side of the detection output transmission device of the physical quantity-electric quantity converter configured as described above and converted into an electric signal. Physical-to-electrical quantity converter is connected. The electric signal is appropriately amplified by the signal adjusting unit, and then sent to the first signal processing unit. The first signal processing means converts the amplified detection output into a digital signal, converts the serial signal into a parallel signal, modulates the parallel signal, and modulates the parallel signal with a rotating transformer that rotates with the object to be measured. input. The rotary transformer transmits a detection output from the rotary unit side to the fixed unit side.

The second signal processing means demodulates the signal transmitted from the rotating part side of the rotary transformer to the fixed part side,
Further, the serial signal is converted into a parallel signal, and a signal corresponding to the physical quantity of the measured object detected by the physical quantity-electric quantity converter is taken out on the fixed part side.

Further, the switching means of the detection output transmission device of the physical quantity-electric quantity converter configured as described above transmits a command signal to the signal adjustment means from the fixed part side of the rotary transformer which is rotationally driven by a brushless motor or the like. If not transmitted, the output signal of the first signal processing means is transmitted to the second signal processing means side (fixed part side) via the rotary transformer.

When a predetermined command signal is sent from the command signal generating means on the fixed part side to the third signal processing means,
The switching means prevents the output signal of the first signal processing means from being transmitted from the rotating part side of the rotary transformer to the fixed part side, and transmits the command signal from the fixed part side of the rotary transformer to the rotating part side. Switch.

The third signal processing means converts a command signal, which is a parallel signal, into a serial signal, modulates the signal, and outputs the modulated signal to the rotary transformer. The fourth signal processing means demodulates the command signal transmitted from the fixed part side of the rotary transformer to the rotary part side, further converts the serial signal into a parallel signal, and outputs the parallel signal to the signal adjusting means.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

FIG. 1 is a block diagram showing an entire configuration of an embodiment of a detection output transmission device for a physical quantity-electric quantity converter according to the present invention.

In FIG. 1, reference numerals 12a to 12d denote first to fourth acceleration converters as physical quantity-electric quantity converters for detecting physical quantities and converting them into electric signals.

Each of the first to fourth acceleration converters 12a to 12d detects an acceleration at a predetermined position of a rotating turntable to be measured and converts the acceleration into an electric signal. That is, the turntable 5 is attached to the centrifugal acceleration measuring device shown in FIG. 2, and the first to fourth acceleration converters 12 a to 12 d are attached to the turntable 5.

Next, the centrifugal acceleration measuring device to which the detection output transmitting device of the physical quantity-electric quantity converter of the present invention is applied will be described.

FIG. 2 is a front view showing the entire configuration of the centrifugal acceleration measuring device.

In FIG. 2, reference numeral 1 denotes a stone surface plate formed in a disk shape. The lower surface of the stone surface plate 1 is fixed to a support 3 via a vibration isolator 2 such as an oil damper or an air damper.

A plurality of columns (four in this example) are provided for the columns 3 and the vibration isolator 2. The lower end of the column 3 is fixed to a flat floor surface.

At the center of the stone surface plate 1, a penetrating motor housing is provided, and a brushless motor 4 (hereinafter simply referred to as "motor") is housed. Motor 4
Is configured to directly rotate the turntable 5 without passing through a belt or a gearbox for speed change, and a rotating shaft supporting portion 5 a suspended on the lower surface of the center of the turntable 5 and a rotating shaft of the motor 4. Is directly connected.

An air bearing 6 is interposed between the motor 4 and the turntable 5, and a rotary shaft support 5a of the turntable 5 is fitted and connected to a rotary cylinder provided at the center of the air bearing 6. The rotating cylinder is rotatably supported on the fixed cylinder by air.

On the outer peripheral surface of the air bearing 6, an air pressure supply section 6a is provided. Compressed air is supplied to the air pressure supply unit 6a from the air cleaner 7 shown in FIG. 3, so that the rotary cylinder part in which the rotary shaft support part 5a of the turntable 5 is fitted is rotatably supported in a non-contact state. Has become.

FIG. 3 is a block diagram schematically showing the entire structure of the present invention.

As is apparent from FIG. 3, an air source 8 is connected to the air cleaner 7. After the air supplied from the air source 8 removes dust and the like by the air cleaner 7, the air is regulated to a predetermined pressure (for example, 3 to 10 kg / cm ² by an air regulator (not shown)). Pressure regulation).

The regulated air is supplied to the air pressure supply section 6a of the air bearing 6, and is also supplied to the vibration isolator 2 through the column 3 as shown in FIG. It is supposed to. The detailed configuration of the air bearing 6 and the rotary shaft support 5a of the turntable 5 is shown in an enlarged sectional view of FIG.

Referring to FIG. 4, the structure of the turntable 5 will be described first. Rotary shaft support 5 of turntable 5
In FIG. 1, a has a cavity 5a1 formed therein, and first to fourth signal conditioners 31a to 31d (hereinafter collectively referred to as signal adjustment means) which are part of a built-in amplifier shown in FIG. Signal conditioner 31) controller 32, A / D converter 33, PS
A converter 34, a modulator 35 and the like are housed.

The signal conditioner 31, the controller 32 and the like will be described later in detail. This cavity 5a
The upper end of 1 is closed by fixing the cover 10 with screws.

A storage section 5a2 for storing cords and the like is provided above the rotary shaft support section 5a. This storage section 5
On the outer peripheral portion of a2, an acceleration converter mounting portion 5a3 having a diameter larger than that of the storage portion 5a2 is formed.

In this embodiment, the acceleration converter mounting portion 5a
3 is formed in a short cylindrical space with a bottom, and a turntable 5
Are provided at equal angular intervals with respect to the rotation center. As shown in the block diagram of FIG. 1, the four acceleration converter storage sections 5a3 have the above-described acceleration converters 12a to 12d.
Are stored one by one, and a total of four acceleration converters are stored as the entire turntable 5.

First, the turntable 5 is fitted with the annular groove of the connecting block 5b and the outer peripheral portion of the rotary cylinder 6b of the air bearing 6 so that the turntable 5 can be freely rotated in the horizontal direction. A plurality of bolts 5 from the upper surface of 5b
b2 at a predetermined angular interval, and
Are integrally connected by being screwed into a female screw hole formed in the hole.

Further, in a state where the upper surface of the connecting block 5b is in contact with the lower surface of the rotary shaft support 5a of the turntable 5, a plurality of bolts 5b are formed from the upper surface of the rotary shaft support 5a.
1, the connecting block 5b is connected to the rotating shaft support 5a.

As a result, the fixed shaft support 5a is connected to the rotary cylinder 6b of the air bearing 6 via the connection block 5b. The rotary cylinder 6b is rotatably supported by the press-fitted air with a small gap with respect to the fixed cylinder of the air bearing 6, so that the turntable 5 is rotatably supported on the air bearing 6 in the horizontal direction. become.

Here, the description returns from FIG. 4 to FIG. As shown in FIG. 2, the air bearing 6 and the turntable 5 are included on the stone surface plate 1 described above,
A safety cover 11 is fixed on the stone surface plate 1.

The safety cover 11 is provided so that even if the acceleration converter comes off the turntable 5 during the test, the safety cover 11 prevents the acceleration converter from being scattered outward due to centrifugal force. This is to prevent touch.

Next, a transmission system and a processing system of the detection output will be described with reference to FIGS. As shown in FIG.
In this embodiment, the four acceleration converters of the first to fourth acceleration converters 12a to 12d can be measured simultaneously.

The first to fourth acceleration converters 12a to 12d are respectively stored and mounted on the four acceleration converter mounting portions 5a3 of the turntable 5 shown in FIGS. 2 and 4. Have been.

The first to fourth acceleration converters 12a to 12d are strain gauge type acceleration converters in this example, and each of the acceleration converters 12a to 12d has a rotation speed of the turntable 5, that is, a rotation speed of the turntable 5. It detects the strain generated in the strain-generating portion deformed in accordance with the acceleration and obtains an acceleration detection output. When the rotation speed of the motor 4 is increased or decreased stepwise, the acceleration that changes stepwise is detected. You can do it.

The detection outputs of the first to fourth acceleration converters 12a to 12d are inputted to the first to fourth signal conditioners 31a to 31d stored in the storage section 5a2. .

The signal conditioner 31 has a physical quantity
It has a function of appropriately amplifying and outputting a small signal output from the electric quantity converter, a function of outputting a predetermined or arbitrary calibration value signal, a filter function of passing a signal in a predetermined frequency range, and a strain gauge. It has a function such as an auto-balancing function that removes a resistance unbalance component and / or a capacity unbalance component of the bridge circuit included in the physical quantity-electric quantity converter of the formula and automatically balances.

The four signal conditioners 31
a to 31d are connected to each other by a control signal line, are configured such that each output can be activated in a predetermined order by the controller 32 or another control circuit, and further, a signal designated by a remote control. The configuration is such that control of the detection output of only the conditioner 31 and output control of the calibration value signal can be performed.

Accordingly, the detection outputs corresponding to the accelerations of the first to fourth acceleration converters 12a to 12d are individually amplified, waveform-shaped, etc. by the first to fourth signal conditioners 31a to 31d, respectively. Is performed. The first signal conditioners 31a to 31d operate under the control of the built-in control circuit, and sequentially output their own output signals in a predetermined order, for example,
The data is output to a 12-bit analog / digital (hereinafter, referred to as “A / D”) converter 33.

The A / D converter 33 outputs a digital signal based on a control signal of the controller 32 for each output of the first to fourth acceleration converters 12a to 12d output from each of the signal conditioners 31a to 31d. And outputs it to a parallel-serial (hereinafter, referred to as “PS”) converter 34 via a switch 101a.

The PS converter 34 includes a controller 3
According to the control signal 2, the 12-bit digital signal output from the A / D converter 33 is converted into a serial signal and output to the modulator 35.

Although not shown in the modulator 35,
An oscillator is built in, and modulates each "1" or "0" of the serially converted data input from the PS converter 34 based on the output signal of the controller 32.

In the case of this embodiment, the output signal (pulse signal) of the oscillator is modulated so that the serial data "1" is 2 fHz and "0" is fHz, and the primary side of the rotary transformer 36 is switched via the switch 101b. That is, it is output to the rotating unit side.

The output signal of this oscillator is "1" of the serial data, depending on the material, number of turns, and characteristics of the rotary transformer.
The setting range can be changed within a certain frequency range before and after each of 2 fHz and fHz in accordance with “0”, so that an optimum transmission efficiency can be selected. For example, f = 10 kHz or a higher frequency can be selected according to the rotary transformer.

The controller 32 and the A / D converter 3
3, the P-S converter 34 and the modulator 35 as main parts,
Of the signal processing means.

The rotary transformer 36 shown in FIG.
The motor 4 is arranged at a position below the rotating main shaft. In FIG. 1, the primary winding 36P and the secondary winding 36S (that is, the winding on the fixed portion side) of the rotary transformer 36 are electromagnetically coupled.

Signals of 2 fHz and fHz corresponding to "1" and "0" induced in the secondary winding 36S of the rotary transformer 36 are input to the demodulator 37 via the switch 101c. .

A control signal from a controller 38 is input to the demodulator 37.
With this control signal, the demodulator 37 demodulates the induced signal of the secondary winding 36S of the rotary transformer 36 into digital measurement data, and performs serial-parallel (hereinafter, "S-
P ”) to the converter 39.

A control signal is input from the controller 38 to the SP converter 39 as well. Based on the control signal, digital serial data output from the demodulator 37 is converted into 12-bit parallel data.

The demodulator 37, controller 38, S
The second signal processing means is configured with the -P converter 39 as a main part. The second signal processing means serves as a fixed-side signal processing means.

The SP converter 3 of the second signal processing means
Numeral 9 outputs a digital signal to the digital output terminal D as it is, and also outputs it to digital / analog (hereinafter, referred to as "D / A") converters 40a to 40d.

The D / A converters 40a to 40d correspond to the first to fourth acceleration converters 12a to 12a, respectively.
2d and the first signal conditioner 31a to the fourth signal conditioner, and the digital output of the SP converter 39 corresponding to the output signal of the first acceleration converter 12a to the fourth signal converter 12d. Each is converted into an analog signal and output to analog output terminals Aa to Ad.

SP sent to the digital output terminal D
The digital signal of the converter 39 is the first acceleration converter 1
It is extracted as a digital signal corresponding to the output of the second acceleration transducer 12d to the fourth acceleration converter 12d, and is transmitted to, for example, the CPU 15 (see FIG. 5) to analyze the detection output of the first acceleration transducer 12a to the fourth acceleration transducer 12d. It is provided for processing.

The analog signals appearing at the analog output terminals Aa to Ad correspond to the outputs of the first to fourth acceleration converters 12a to 12d, and can be displayed on a display device (not shown) or magnetically recorded. It can be recorded on a reproducing means or measured by a measuring instrument.

On the other hand, channel designation switches Ca to Cd
Are the first signal conditioner 31a to the fourth signal conditioner, respectively.
When issuing a command such as calibration, zero adjustment, or auto balance adjustment to the signal conditioner 31d, the switch outputs a designation signal for designating which signal conditioner 31 is designated. These channel designation switches Ca to Cd correspond to the first to fourth acceleration converters 12a to 12d, respectively.

The switches Ta and Tb are calibration command switches, and include the first signal conditioners 12a to the fourth signal conditioners 12a to 12b.
It is a calibration switch for outputting a command signal when outputting a predetermined (+) side calibration value and a predetermined (−) side calibration value to the signal conditioner 12d.

The zero adjustment command switch Tc is a switch for outputting a command signal when DC zero of the signal conditioner 31 or the like is taken.

Further, the auto balance command switch Td
Is a switch for outputting a signal instructing the first signal conditioner 31a to the fourth signal conditioner 31 to balance each bridge circuit.

The channel designation switches Ca to C
d, calibration command switches Ta, Tb, zero adjustment command switch Tc, auto balance command switch Td, etc.
It constitutes command signal generating means.

The channel command signals output from the channel designating switches Ca to Cd and the command signals output from the command switches Ta to Td are digital signals of a plurality of bits, and are input to the PS converter 41. Therefore, the signal is converted into a serial signal and input to the modulator 42.

The modulator 42 modulates a digital command signal based on the control signal from the controller 38 and applies the modulated signal to the secondary winding 36S of the rotary transformer 36 via the switch 101c. It has become.

Thus, the PS converter 41 and the modulator 42
The third signal processing means is constituted by using the controller and the controller 38 as main parts. This controller 38 is commonly used for the second and third signal processing means.

The switches 101a to 101c are:
The switching means comprises a designation signal from the channel designation switches Ca to Cd and a calibration switch T
When the command signals from a to Td are output, the output signal of the A / D converter 33 is output from the primary winding 36 of the rotary transformer 36.
The transmission from P to the secondary winding 36S is blocked, and the channel designation signal and the command signal are cut off so that they can be transmitted from the secondary winding 36S of the rotary transformer 36 to the primary winding 36P. It has been replaced.

Conversely, when the channel designation signal and each command signal are not output, each of the switches 101a to 101a
101c outputs the output of the A / D converter 33 to the rotary transformer 3
6 so that it can be transmitted from the primary winding 36P to the secondary winding 36S.

The channel designation signal and each command signal transmitted from the secondary winding 36S to the primary winding 36P of the rotary transformer 36 are transmitted to the demodulator 4 via the switch 101b.
After demodulation at 3, the SP converter 44 converts the signal to a parallel signal.

The output of this SP converter 44 is
01a and the first signal conditioners 31a to 4th
It is designed to be added to the signal conditioner 31d.

When the output signal of the SP converter 44 is added to the switch 101a, the A / D
The output signal of the converter 33 is prevented from being input to the PS converter 34, and is prevented from being transmitted from the primary winding 36P of the rotary transformer 36 to the secondary winding 36S. I have. Along with this, it is possible to prevent the output signals of the first to fourth signal conditioners 31a to 31d from interfering with the channel designation signal and the command signal.

The output of the SP converter 39 appearing at the digital output terminal D is output from the CP converter 39 as shown in FIG.
U15, a keyboard 16, a printer 18 and the like are connected to the CPU 15, and the CPU 15 analyzes the acceleration detection outputs detected by the first acceleration converter 12a to the fourth acceleration converter 12d. Keyboard 1
Various data processing is performed by the operation of 6, and the analysis processing result can be printed out as measured value data by the printer 18.

Of the members shown in FIG. 1, the first to fourth acceleration converters 12a to 12d to the rotary transformer 36 are arranged on the rotary unit side, and the parts from the demodulator 37 to the display device 45 are: It is arranged on the fixed part side.

FIG. 5 shows an example of the arrangement of the analysis processing system.
6 and the CPU 15 are arranged.
The display device 45 shown by the symbol is disposed, and the printer 18 is provided on the shelf.
Is placed.

Although not shown in FIG. 1, a clock pulse is outputted from the pulse generator 20 to the motor controller 21 as shown in FIG.

The output of the encoder 22 shown in FIG. 2 is input to the motor controller 21.
The encoder 22 measures and encodes the number of revolutions (rotational angular velocity) of the motor 4, and the motor controller 21 compares the phase with the output of the encoder 22 based on the pulse of the pulse generator 20, and In accordance with the phase difference, the rotation speed of the motor 4 is controlled so as to reach a predetermined set speed.

The encoder 22 is arranged below the motor 4 as shown in FIG.

Reference numeral 23 shown in FIG. 3 denotes an external power supply provided on the fixed side. The output of the external power supply 23 is supplied to the rotary transformer 13 (FIG. 2) wound around the same core as the rotary transformer 36. ) To a regulator (not shown). This rotary transformer 1
3, the external power supply 23 can be supplied to the regulator in a non-contact state without using a slip ring or a brush.

The regulator rectifies the AC voltage supplied from the external power supply 23 into a DC voltage, and then, as a predetermined constant voltage, sets the signal conditioner 31 and the controller 32 as a predetermined constant voltage.
And so on.

As shown in FIG. 3, the pulse generator 20, the motor controller 21, the external power source 23, etc.
The noise filter 26 and the shield transformer 27 are accommodated in the bottom of the rack 25 with a caster.
The setting of the number of rotations can be switched by operating the switch 28.

The set rotation speed for each operation of the switch 28 is displayed on the display device 45.

The operation of this embodiment thus constructed will be described.

First, the rotation transformer 13 is supplied from the external power supply 23.
Power is supplied to the regulator via the rectifier, and the regulator rectifies the AC voltage supplied from the external power supply 23 into a DC voltage, and then rectifies the voltage to a constant voltage, and the signal conditioner 3
1. Supply operating power to the controller 32 and the like.

By operating the switch 28 shown in FIG.
By setting the rotation speed of the motor 4, that is, the acceleration, the set rotation speed is displayed on the display device 45.

When the motor 4 is rotated at the set rotation speed, the actual rotation speed of the motor is measured by the encoder 22, and the measured value is encoded.
Is sent to the motor controller 21.

The motor controller 21 compares the phase of the pulse input from the pulse generator 20 with the phase of the output of the encoder 22, and determines the rotation speed of the motor 4 according to the phase difference so that the rotation speed of the motor 4 becomes the set rotation speed. Perform control.

Since the motor 4 is a brushless motor and directly drives the turntable 5, the turntable 5 can be rotated with high alignment accuracy and small jitter (JITTER). FIG.
FIG. 7 is a characteristic diagram showing the relationship between the command voltage and the number of rotations of the motor 4. As is clear from FIG. 6, the number of rotations is almost linear with respect to the command voltage, and FIG. FIG. 4 is a characteristic diagram showing the relationship between the number of rotations and it can be seen that the jitter is extremely small.

FIG. 8 is a graph showing the start-up of the motor 4,
It shows the falling characteristic, and it can be seen that the rising and falling are symmetrical and there is no unevenness.

As shown in FIGS. 6 to 8, it can be seen that the characteristics of this brushless motor are excellent. Therefore,
The rotation of the turntable 5 directly driven by the motor 4 is extremely stable without any misalignment, and thus very accurate acceleration can be given to the first to fourth acceleration converters 12a to 12d.

The rotary shaft support 5a of the turntable 5 rotated by the motor 4 is integrated with the rotary cylinder 6b of the air bearing 6, and is rotatable in a non-contact state with the fixed cylinder of the air bearing 6. Since it is pivotally supported, no mechanical vibration is generated. In addition, there is no wear or seizure, and from the motor 4 and the rotary transformers 13 and 36,
Since noise is not generated by the conventional brush, noise is not superimposed on the detection outputs of the first to fourth acceleration converters 12a to 12d, and acceleration detection can be performed with higher accuracy.

As described above, by performing the rotation and the rotation support of the turntable 5, the acceleration corresponding to the rotation speed of the turntable 5 is stored and fixed in each acceleration converter mounting portion 5a3 of the turntable 5. The first acceleration converter 12a to the fourth acceleration converter 12d can be provided accurately.

The detection outputs of the first to fourth acceleration converters 12a to 12d are individually input to the first to fourth signal conditioners 31a to 31d, respectively. This signal conditioner 31 is configured to control the first signal conditioners 31a to 31a based on a control signal from a control circuit or a controller 32.
For each output of the fourth signal conditioner 31d, in other words, the first acceleration converter 12a to the fourth acceleration converter 1
1st for every 1 to 4 channels corresponding to 2d
The detection output of the signal conditioner 31a to the fourth signal conditioner 31d is selected, and the A / D converter 3
3 is output.

The A / D converter 33 outputs the first signal conditioner 3 based on the output signal from the controller 32.
The analog detection output of each of the first to fourth acceleration converters 12a to 12d output from the 1a to 4th signal conditioners 31d is converted into a 12-bit digital signal, and the signal is output to the P- Output to the S converter 34.

At this time, the channel designation switch Ca
To Cd, no channel designation signal is input, and no command signal is input by the calibration command switches Ta to Td. Therefore, all the switches 101a to 101c perform the first acceleration conversion. Vessel 1
The detection outputs of the second to fourth acceleration converters 12d can be transmitted from the rotating unit side to the fixed unit side. Thereby, as described above, the output signal of the A / D converter 33 is transmitted to the PS converter 34 via the switch 101a.

In the PS converter 34, the 12-bit first acceleration converter 12 output from the A / D converter 33
The parallel data of the detection output for each of the a to fourth acceleration converters 12 d is converted into serial data based on the control signal from the controller 32 and output to the modulator 35.

In the modulator 35, based on the control signal of the controller 32, the output signal of the oscillator incorporated in the modulator 35 is converted into “1”, “0” of the serial data sent from the PS converter 34. 2fH
The frequency is modulated to z and fHz and applied to the primary winding 36P of the rotary transformer 36 via the switch 101b.

The serial data modulation signal induced in the secondary winding 36S of the rotary transformer 36 is input to the demodulator 37 via the switch 101c. The demodulator 37 demodulates the modulated signal based on the output signal of the controller 38,
The serial data of “1” and “0” is sent to the SP converter 39.

The SP converter 39 converts the serial data demodulated signal sent from the demodulator 37 into parallel data based on the output signal from the controller 38, and converts the demodulated signal into parallel data. For each detection output of the acceleration converter 12d, based on the control signal of the controller 38,
Output to the D / A converters 40a to 40d and output to the digital output terminal D.

The parallel data output from the SP converter 39 output to the digital output terminal D corresponds to the CP shown in FIG.
By being sent to U15, the first acceleration converter 12a
Analysis processing of the detection output of the fourth acceleration converter 12d can be performed, and the analysis processing result can be displayed on the display device 45 by the operator operating the keyboard 16 or printed out by the printer 18. it can.

It is also possible to use such a general-purpose personal computer for such analysis processing system to manage product history and to provide a statistical processing function.

Needless to say, a dedicated microcomputer can be used instead of the personal computer.

Next, when the setting of the rotation speed of the motor 4 is switched in a stepwise manner by operating the switch 28, the first acceleration converters 12a to 12a to 12c are switched in accordance with the switching of the stepwise rotation.
The step-like acceleration is applied to the fourth acceleration converter 12d, and the respective outputs of the acceleration converter at that time can be derived, and therefore, the multi-stage acceleration setting can be programmed. . Next, the calibration command switch Ta
~ Td to command signal and channel designation switch Ca
To Cd are the first signal conditioner 31a to the fourth signal conditioner 31d.
The operation in the case of being sent to is described. In this description, the first signal conditioners 31a to the fourth
The case where a channel designation signal and a command signal are sent to the first signal conditioner 31a of the first channel among the signal conditioners 31d will be described as a representative.

Of course, the second signal conditioners 31b to 31b
Similarly, a command signal and a channel designation signal can be sent to the fourth signal conditioner 31d. In this case, channel designation signals may be sent from the channel designation switches Cb to Cd.

Now, as described above, the first channel
When the first channel designation signal is sent to the signal conditioner 31a and the signal conditioner 31a outputs a predetermined (+) calibration value signal among the calibration command switches Ta to Td, for example, the calibration command switch Ta
To send a command signal for calibration to (+). To output a predetermined (-) calibration value signal, the user operates the calibration command switch Tb.

Further, when performing zero adjustment (offset adjustment), a command signal for zero adjustment is input from the zero adjustment switch Tc, and at the time of auto balance adjustment, a command signal for auto balance is input from the auto balance command switch Td. I do.

The command signal and the channel designation signal are sent to the PS converter 41, where the parallel signal is converted into a serial signal and then output to the modulator. The modulator 42 modulates based on the control signal from the controller 38 and outputs the modulated signal to the switch 101c.

When all of the above-mentioned channel designation signals and command signals are output, switches 101a to 101c prevent transmission of signals from the rotating unit side to the fixed unit side, and conversely, switch from the fixed unit side to the rotating unit side. Is switched by a controller (not shown) so as to enable transmission of a signal to the controller.

Therefore, the output signal of the modulator 42 is transmitted to the secondary winding 36 of the rotary transformer 36 via the switch 101c.
S to the primary winding 36P of the rotary transformer 36.
The output signal of the modulator 42 induced by the
Is input to the demodulator 43 via the. This demodulator 43
The modulated signal is demodulated, converted into serial data of “1” and “0”, and transmitted to the SP converter 44.

The SP converter 44 converts the demodulated signal sent from the demodulator 43 into parallel data and sends out a channel designation signal and a command signal to the first signal conditioner 31a of the first channel. .

Thus, the first signal conditioner 31a outputs the content of the command signal, that is, (+), (-)
According to one of the command signals of the calibration command, the zero adjustment command, and the auto balance command, one of the processes of calibration, zero adjustment, and auto balance is executed.

As described above, according to this embodiment, the first acceleration converters 12a to the fourth
The acceleration detection output of the acceleration converter 12d is input to each of the first signal conditioner 31a to the fourth signal conditioner 31d corresponding thereto, and the signal conditioner 31a of four channels is input.
３１31d are sequentially selected in chronological order,
After being converted to a digital signal by the A / D converter 33, the P-S
The converter 34 converts the data into serial data, and the modulator 35 modulates the serial data "1" and "0" to 2 fHz and fHz, respectively. Is transmitted to the demodulator 37 disposed in the first and second converters, and the output thereof is converted into parallel data by the SP converter 39. Therefore, the detection outputs of the first acceleration converter 12a to the fourth acceleration converter 12d are Transmission from the rotating part side to the fixed part side can be performed in a non-contact state, there is no wear unlike the conventional slip ring transmission method, not only maintenance is unnecessary, but also there is no occurrence of sliding noise and the S / N ratio Improved and accurate transmission is possible.

Further, each of the signal conditioners 31a-31
In this case, the switches 101a to 101c are switched to a state where transmission is possible from the fixed part to the rotating part, and the other side is switched. Of each signal conditioner 31a.
Calibration operation, auto-balancing operation, etc., every 31d can be remotely controlled on the fixed part side, so that it is more convenient and always accurate detection output can be obtained.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention.

That is, in the above embodiment, for the sake of explanation, the acceleration of the turntable is set to the first
Although the case where the detection is performed by the acceleration converters 12a to 12d has been described as an example, the present invention is applicable to any device that can detect a physical quantity and convert it into an electric signal. Of course, the present invention can also be applied to the case where physical quantities such as torque, load, displacement, pressure, temperature, and humidity are detected by using a torque transducer, a load transducer, a displacement transducer, a pressure transducer, a temperature sensor, a humidity sensor, and the like. .

The output of each physical quantity-electric quantity converter is:
The signal may be directly connected to the multiplexer without passing through a signal conditioner. In this case, the output of each converter is individually and sequentially switched by an output signal of a controller having a built-in sequence counter, and the A / D converter is switched. 33
To be sent.

[0124]

As described above in detail, according to the first aspect of the present invention, the detection output of the physical quantity of the object to be measured can be transmitted from the rotating section to the fixed section in a non-contact state, and the conventional slip ring transmission can be performed. In addition to the absence of wear as in the system, maintenance is not required, and no sliding noise is generated.
It is possible to provide a detection output transmission device of a physical quantity-electric quantity converter in which the / N ratio is greatly improved and signal transmission with high accuracy is possible.

According to the second aspect of the present invention, a calibration operation, an auto-balance operation, and the like are performed for each of the plurality of signal adjustment means.
It is possible to provide a detection output transmission device of a physical quantity-electric quantity converter that can be remotely controlled on the fixed part side, can efficiently perform a measurement operation, and as a result, can accurately detect a physical quantity in a rotating body.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of an embodiment of a detection output transmission device for a physical quantity-electric quantity converter according to the present invention.

FIG. 2 is a partially cutaway front view showing the entire configuration of the centrifugal acceleration measuring device applied to the embodiment of FIG. 1;

FIG. 3 is a block diagram showing an overall schematic configuration of the embodiment.

FIG. 4 is an enlarged sectional view of a portion related to a turntable and an air bearing in the centrifugal acceleration measuring device of FIG. 2;

FIG. 5 is an explanatory diagram showing an arrangement relationship of a folding processing system in the embodiment of FIG. 1;

FIG. 6 is a characteristic diagram showing a relationship between a command voltage of a motor and a rotation speed of the centrifugal acceleration measuring device of FIG. 2;

FIG. 7 is a characteristic diagram showing a relationship between a rotational speed of a motor and jitter in the centrifugal acceleration measuring device of FIG. 2;

FIG. 8 is a characteristic diagram showing a relationship between a command voltage and a rotation speed of a motor of the centrifugal acceleration measurement device of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stone surface plate 2 Anti-vibration device 3 Prop 4 Motor 5 Turntable 5a Rotation shaft support 5a3 Acceleration transducer mounting part 5b Connecting block 6 Air bearing 6a Air pressure supply part 6b Rotating cylinder part 7 Air cleaner 8 Air source 10 Cover 12a First Acceleration converter 12b second acceleration converter 12c third acceleration converter 12d fourth acceleration converter 13,36 rotary transformer 15 CPU 16 keyboard 18 printer 20 pulse generator 21 motor controller 22 encoder 23 external power supply 24 regulator 31, 31a-31d Signal conditioner 32, 38 Controller 33 A / D converter 34, 41 PS converter 35, 42 Modulator 36 Rotary transformer 36P Primary winding 36S Secondary winding 37, 43 Demodulator 39, 44 SP Converter, 40 ~40d D / A converter 45 display 101a~101c changer Aa~Ad analog output terminal Ca~Cd channel specifying switch D digital output terminal Ta~Tb calibration instruction switch Tc zero adjustment command switch Td Autobalance command switch

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G08C 19/00

Claims (2)

(57) [Claims] 1. A signal adjusting means for receiving a detection output of a physical quantity-electric quantity converter for detecting a physical quantity of a rotating object to be measured and converting the physical quantity into an electric signal, and amplifying the output, and a signal output from the signal adjusting means. Signal processing means for performing a modulation process after converting a parallel signal obtained by digitally converting a signal into a serial signal, and an output of the first signal processing means which rotates together with the object to be measured and is fixed from a rotating unit side. A rotary transformer for transmitting the signal to a fixed part of the rotary transformer, and second signal processing means for demodulating the signal transmitted to the fixed part of the rotary transformer and converting the signal to a parallel signal. Transmission output device for the electric quantity converter. 2. A function for receiving a detection output of a physical quantity-electric quantity converter for detecting a physical quantity of a rotating object to be measured and converting the physical quantity into an electric signal, amplifying the detected output, a function of outputting a calibration value signal, and a function of a bridge circuit. A signal adjusting unit having a function of removing an unbalanced component, and a first signal processing unit for performing a modulation process after converting a parallel signal obtained by digitally converting a signal output from the signal adjusting unit into a serial signal. A rotary transformer which rotates with the object to be measured and transmits the output of the first signal processing means from the rotary unit side to the fixed unit side, and a demodulation process of a signal transmitted to the fixed unit side of the rotary transformer to perform parallel processing. A second signal processing means for converting the signal into a signal; and a command signal for generating a command signal such as the calibration value signal output command for controlling the signal adjustment means and the balance adjustment command for the bridge circuit from the fixed part side. Generating means, a third signal processing means for converting a parallel command signal outputted from the command signal generating means into a serial signal and modulating the serial signal, and an output signal of the first signal processing means when the command signal is not generated Is transmitted to the second signal processing means via the rotary transformer, and when the command signal is generated, the signal output from the first signal processing means is transmitted to the second signal processing means. Switching means for transmitting the output of the third signal processing means from the fixed portion side of the rotary transformer to the rotating portion side, and the third signal transmitted from the fixed portion side of the rotary transformer to the rotating portion side. And a fourth signal processing means for demodulating and parallel-converting the output signal of the signal processing means and outputting the converted signal to the signal adjusting means.