JPH04258768A - Centrifugal type acceleration measuring device - Google Patents

Abstract

PURPOSE:To prevent useless vibration from being generated on a turn table mounted with measured acceleration converters, correctly apply the preset acceleration to the acceleration converters, prevent noises from being generated by a drive source and a signal transmission system, and detect only the true outputs of the measured acceleration converters. CONSTITUTION:A turn table 5 is rotatively driven by a brush-less motor 4 while being rotatably supported in no contact with a fixed section by an air bearing 6. Multiple measured acceleration converters fixed to the mount section 5a of the turn table 5 detect the acceleration due to the horizontal rotation of the turn table 5 and convert it into electrical signals. The detected outputs are amplified and A/D-converted as appropriate and sent to the fixed side via a rotary transformer 36.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] This invention relates to a centrifugal acceleration measuring device, and more specifically, the turntable is directly driven by a brushless motor, and the turntable is rotatably supported by an air bearing to achieve high accuracy. The present invention relates to a centrifugal acceleration measuring device that is capable of measuring acceleration.

0002

[Prior Art] A centrifugal acceleration measuring device rotates a turntable on a horizontal plane, and connects an acceleration transducer (hereinafter referred to as an "acceleration converter") to be measured via a jig to the outer periphery of the turntable.
), the turntable is rotated, centrifugal acceleration is applied to the acceleration converter on the turntable, and the output characteristics at this time are verified and measured.

[0003] In such a centrifugal acceleration measuring device, an induction motor is used as the motor that rotates the turntable, and the rotational force is transmitted through a belt, a multistage gearbox, a clutch, etc. until the turntable is stopped. Sometimes I try to apply the brakes.

In addition, the rotational speed of the motor is also controlled using an open loop method.

On the other hand, the rotation of the turntable is mechanically supported by ball bearings.

[0006] Also, as the turntable rotates,
The acceleration converter detects centrifugal acceleration, and the detected detection output is transmitted to the measurement system via the signal transmission system. Since the turntable is rotating and the measurement system is installed in a stationary location, this signal transmission system uses an analog transmission method using mechanical contact using slip rings and brushes. .

The detection output via this transmission system is input to the measurement system as an analog signal, converted to a digital signal, and then sent to the central processing unit (hereinafter referred to as "CPU") via an input/output circuit.
”).

After predetermined analysis processing is performed by this CPU, the analysis results are displayed on a display device or printed out on a printer.

Furthermore, power is generally supplied to the acceleration converter provided in the turntable using a slip ring method.

0010

[Problems to be Solved by the Invention] In the conventional centrifugal acceleration measuring device, firstly, since an induction motor or the like is used in the rotational drive system of the turntable, brush sliding noise is generated. This has the disadvantage of being mixed into the detection output, and since the drive is transmitted via belts, multi-stage gearboxes, clutches, etc., the device becomes large and vibrations are added to the turntable, resulting in accurate measurement. It was difficult to apply acceleration to the acceleration converter.

[0011] Furthermore, since the detection output transmission system is based on a mechanical analog transmission system using slip rings and brushes, the detection output is sensitive to wear on sliding parts, poor contact, and noise associated with contact. The superposition of the two is unavoidable.

Furthermore, since power is supplied to the measurement system by a sliding type using slip rings and brushes, wear and tear is inevitable.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to prevent unnecessary vibrations from being generated or applied to the turntable, and therefore to provide a predetermined vibration to the acceleration transducer to be measured. It is an object of the present invention to provide a centrifugal acceleration measuring device that can provide an acceleration of 1,000 yen, generate no noise from a drive source or signal transmission system, and can truly detect only the output of an acceleration converter to be measured.

[0014]

[Means for Solving the Problems] In order to achieve the above object, the present invention is directly driven by a brushless motor, and an acceleration converter mounting part for mounting an acceleration converter to be measured is eccentric from a center of rotation. a turntable formed in the part, an air bearing that rotatably supports the turntable, and a built-in amplifier that individually amplifies the output of the acceleration converter attached to the acceleration converter mounting part of the turntable. , and a rotary transformer that transmits the signals output from the built-in amplifier to the respective fixed parts, and applies a predetermined acceleration to the acceleration converter to be measured by changing the rotational speed of the brushless motor, and then The present invention is characterized in that the output of the acceleration converter to be measured is guided to the fixed part side via the rotary transformer.

[0015]

[Operation] Since the brushless motor of this invention directly drives and rotates the turntable, and the rotated turntable is rotatably supported in a non-contact state by an air bearing, unnecessary vibrations are not applied to the turntable. do not have.

[0016] The plurality of acceleration converters provided on the turntable each detect the acceleration associated with the horizontal rotation of the turntable, and output the detection output to an individual built-in amplifier. The output is appropriately amplified and converted to a digital signal as necessary.

This converted output is transmitted to a measurement system arranged at a stationary part other than the turntable via a rotary transformer provided at a rotating part corresponding to each acceleration converter.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a front view showing the overall configuration of an embodiment of a centrifugal acceleration measuring device according to the present invention.

In FIG. 1, reference numeral 1 denotes a stone surface plate formed in the shape of a disc. The lower surface of this stone surface plate 1 is fixed to a column 3 via a vibration isolating device 2 such as an oil damper or an air damper. A plurality of pillars 3 and vibration isolators 2 (four in this example) are provided. The lower end of the support column 3 is fixed to a flat floor surface.

A penetrating motor housing is provided in the center of the stone surface plate 1, and a brushless motor 4 (hereinafter simply referred to as "motor") is housed therein. The motor 4 is designed to directly rotate the turntable 5 without using a belt or a gearbox for speed change.
A rotary shaft support 5a suspended from the lower surface of the center of the turntable 5 and a rotary shaft of the motor 4 are directly connected.

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

An air pressure supply section 6a is provided on the outer peripheral surface of the air bearing 6. The air pressure supply section 6a is supplied with compressed air from the air cleaner 7 shown in FIG. 2, thereby rotatably supporting the rotating cylindrical section into which the rotating shaft support 5a of the turntable 5 is fitted in a non-contact state. It has become.

FIG. 2 is a block diagram schematically showing the overall configuration of the present invention.

As is clear from FIG. 2, an air source 8 is connected to the air cleaner 7. After removing dust etc. from the air supplied from the air source 8, the air is regulated to a predetermined pressure (for example, 3 to 10 kg/cm2) using an air regulator (not shown) that maintains the predetermined air pressure. pressure).

This pressure-regulated air is supplied to the air pressure supply section 6a of the air bearing 6 mentioned above, and is also supplied to the vibration isolator 2 through the support column 3, as shown in FIG. It is supposed to be done.

The air bearing 6 and turntable 5
The detailed structure of the rotary shaft support 5a is shown in the enlarged sectional view of FIG.

Referring to FIG. 3, first, the configuration of the turntable 5 will be described. Rotating shaft support 5 of turntable 5
A cavity 5a1 is formed inside of which a multiplexer 31, a controller 32, an A/D converter 33, a P-S converter 34, and a modulator 3, which will be described later, are part of a built-in amplifier.
5th grade is stored. The multiplexer 31, controller 32, etc. will be described in detail later with reference to FIG. The upper end of this cavity 5a1 is closed by a cover 10 fixed thereto.

Further, a storage section 5a2 for storing cords, etc. is provided at the upper part of the rotating shaft support 5a. This storage section 5
An acceleration converter mounting portion 5a3 having a diameter larger than that of the storage portion 5a2 is formed on the outer circumferential portion of a2.

In this embodiment, the acceleration converter mounting section 5a
3 is formed in a short cylindrical space with a bottom, and a turntable 5
Four of them are provided at equal angular intervals with respect to the center of rotation. As shown in the block diagram of FIG. 4, the four acceleration converter storage sections 5a3 each store one acceleration converter 12a to 12d, for a total of four acceleration converters for the turntable 5 as a whole. It has become so.

This turntable 5 is constructed by first fitting the annular groove of the connecting block 5b with the outer periphery of the rotary cylindrical portion 6b of the air bearing 6 so that the turntable 5 can rotate freely in the horizontal direction. Multiple bolts 5 from the top surface of 5b
b2 is inserted at a predetermined angular interval, and the rotary cylinder part 6b
They are integrally connected by screwing into a female screw hole formed in the .

Further, with the upper surface of the connecting block 5b in contact with the lower surface of the rotary shaft support 5a of the turntable 5, a plurality of bolts 5b are inserted from the upper surface side of the rotary shaft support 5a.
1 connects the connecting block 5b to the rotating shaft support 5a.

[0033] Thereby, the fixed shaft support 5a is connected to the rotating cylinder portion 6b of the air bearing 6 via the connection block 5b. This rotary cylindrical portion 6b is rotatably supported by press-in air with a minute gap with respect to the fixed cylindrical portion of the air bearing 6, and in turn, the turntable 5 is rotatably supported in the horizontal direction relative to the air bearing 6. become.

The explanation will now be returned from FIG. 3 to FIG. 1. As shown in FIG. 1, on the stone surface plate 1 described above, an air bearing 6 and a turntable 5 are included.
A safety cover 11 is fixed on the stone surface plate 1.

This safety cover 11 is provided to prevent the acceleration converter from scattering outward due to centrifugal force even if it comes off the turntable 5 during the test, and to prevent the operator from touching the turntable 5 during operation. This is to prevent touching.

Next, the detection output transmission system and processing system will be explained with reference to FIGS. 2 and 4. As shown in Figure 4,
In this embodiment, four acceleration converters, the first to fourth acceleration converters 12a to 12d, are configured to be able to perform measurements simultaneously.

These first to fourth acceleration converters 12a to 12d are stored and mounted, one on each of the four acceleration converter mounting portions 5a3 of the turntable 5 shown in FIGS. 1 and 3. has been done.

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 corresponds to the rotational speed of the turntable 5, that is, An acceleration detection output is obtained by detecting distortion according to acceleration, and when the rotational speed of the motor 4 is increased or decreased in a stepwise manner, acceleration that changes in a stepwise manner can be detected.

The detection outputs of the first to fourth acceleration converters 12a to 12d are input to a multiplexer 31 housed in the storage section 5a2.

The multiplexer 31 selects the first to fourth acceleration converters 12a to 1 based on the output signal of a controller 32 having a built-in sequence counter (not shown).
By inputting the output of 2d individually, that is, inputting data for 4 channels for each channel and switching them sequentially,
The signal is output to a 2-bit analog/digital (hereinafter referred to as "A/D") converter 33.

The A/D converter 33 converts each output of the first to fourth acceleration converters 12a to 12d outputted from the multiplexer 31 into digital signals based on the controller signal of the controller 32. The signal is output to a parallel-serial (hereinafter referred to as "P-S") converter 34.

This P-S converter 34 is connected to the controller 3
The 12-bit digital signal outputted from the A/D converter 33 is serially converted and outputted to the modulator 35 by the control signal No. 2.

Although not shown in the modulator 35,
An oscillator is built in, and based on the output signal of the controller 32, modulation is applied to each "1" and "0" of the serially converted data input from the P-S converter 34.

In the case of this embodiment, the output signal of the oscillator (
The pulse signal) is modulated and output to the primary side of the rotary transformer 36.

This rotary transformer 36 is shown in FIG.
It is located below the rotational main shaft of the motor 4. In FIG. 4, the primary windings 36P and 2 of this rotary transformer 36
The next winding 36S is synchronized with the rotation of the motor 4 and is electromagnetically coupled.

50 KHz and 25 KHz corresponding to "1" and "0" induced in the secondary winding 36S of the rotary transformer 36
The signal is input to a demodulator 37.

A control signal from a controller 38 is input to this demodulator 37 . Based on 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 converts it into serial-parallel (hereinafter referred to as "S-
The signal is output to a converter 39 (referred to as "P").

A control signal from the controller 38 is also input to the S-P converter 39. Based on this control signal, digital serial data output from the modulator 37 is converted into 12-bit parallel data.

This parallel data is sent to the four latch circuits 40a to 40d for each channel based on the output signal from the controller 38, that is, to the first acceleration converter 12a.
It is designed to be latched in response to the output of ~12d.

These four latch circuits 40a to 40d
Each output is input to digital/analog (hereinafter referred to as "D/A") converters 41a to 41d, respectively, and a binary coded decimal converter (hereinafter referred to as "D/A") converter 41a to 41d.
(referred to as a "BCD converter") 42.

This BCD converter 42 is connected to each latch circuit 4.
Outputs for each of 0a to 40d are inputted, converted into decimal digits using the binary coded decimal system, and output to the display device 43. The display device 43 may be a CRT display device or the like.

Although not shown in FIG. 4, the output of the S-P converter 39 is transmitted to the CPU as shown in FIG.
A keyboard 16, a printer 18, etc. 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 16
Various data processing is performed by the operation, and the results of the analysis processing can be printed out as measured value data using the printer 18.

Of the members shown in FIG. 4, the first to fourth acceleration converters 12a to 12d to the rotary transformer 36 are arranged on the rotating part side, and the parts from the demodulator 37 to the display device 43 are fixed. It is placed on the side.

FIG. 5 shows an example of the arrangement of the analysis processing system, in which the keyboard 16 and CPU 15 are arranged on a disk 19 with casters, and the display device 43 shown in FIG. 1 is arranged on the CPU 15. printer 1 on the shelf.
8 is placed.

Further, in FIG. 4, clock pulses are output from the pulse generator 20 to the motor controller 21.

The output of the encoder 22 is input to the motor controller 21 . The encoder 22 measures and encodes the rotational speed (rotational angular velocity) of the motor 4, and the motor controller 21
A phase comparison is made with the output of the encoder 22 using the pulses of the pulse generator 20 as a reference, and the rotational speed of the motor 4 is controlled to a predetermined set speed according to the phase difference.

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

23 is an external power supply provided on the fixed side, and the output of this external power supply 23 is connected to the rotary transformer 13.
Power is supplied to the regulator 24 via the regulator 24. This rotary transformer 13 allows power to be supplied from the external power source 23 to the regulator 24 in a non-contact manner without using a slip ring or brush.

[0059] The regulator 24 rectifies the AC voltage supplied from the external power supply 23 into a DC voltage, and then supplies the DC voltage to the multiplexer 31, controller 32, etc. as a predetermined constant voltage.

The pulse generator 20, motor controller 21, external power supply 23, etc. are as shown in FIG.
It is built into a rack 25 with casters, and the bottom of this rack 25 houses a noise filter 26, a shield transformer 27, etc., and a motor controller 21.
The setting of the rotation speed can be changed by operating a switch 28.

The set rotational speed for each operation of this switch 28 is displayed on the display device 43.

The operation of this embodiment configured as described above will be explained.

First, the rotary transformer 13 is connected to the external power source 23.
The regulator 24 rectifies the AC voltage supplied from the external power supply 23 into a DC voltage, and then converts the AC voltage to a constant voltage to the multiplexer 3.
1. Supply operating power to the controller 32, etc.

Furthermore, by operating the switch 28 shown in FIG.
By setting the rotational speed, that is, the acceleration of the motor 4, the set rotational speed is displayed on the display device 43.

When the motor 4 is rotated at this set rotational speed, the actual rotational speed of the motor is measured by the encoder 22, and the measured value is encoded and transmitted to the encoder 22.
The output is sent to the motor controller 21.

The motor controller 21 compares the phase of the pulse inputted from the pulse generator 20 and the output of the encoder 22, and adjusts the rotational speed according to the phase difference so that the rotational speed of the motor 4 becomes the set rotational speed. Take control.

The motor 4 is a brushless motor and directly drives the turntable 5 to rotate, so the turntable 5 can be rotated with high center runout accuracy and little jitter (JITTER).

FIG. 6 is a characteristic diagram showing the relationship between the command voltage and the rotation speed of the motor 4. As is clear from FIG. 6, the rotation speed is almost linear with respect to the command voltage. Further, FIG. 7 is a characteristic diagram showing the relationship between jitter and rotation speed, and it can be seen that jitter is extremely small.

Furthermore, FIG. 8 shows 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 this brushless motor has excellent characteristics. therefore,
The rotation of the turntable 5, which is directly driven by the motor 4, is extremely stable without center runout, and as a result, extremely accurate acceleration can be given to the first to fourth acceleration converters 12a to 12d.

Further, the rotary shaft support 5a of the turntable 5 rotated by the motor 4 is integrated with the rotary cylindrical portion 6b of the air bearing 6, and can freely rotate with respect to the fixed cylindrical portion of the air bearing 6 in a non-contact state. Since it is pivoted, no mechanical vibration occurs. Moreover, there is no wear or seizure, and the motor 4 and rotary transformers 13a to 13d
Since the noise caused by the conventional brush is not generated, noise is not superimposed on the detection outputs of the first to fourth acceleration converters 12a to 12d, and acceleration can be detected with even higher accuracy.

By rotating and rotatably supporting the turntable 5 in this manner, the acceleration corresponding to the rotational speed of the turntable 5 is stored and fixed in each acceleration converter mounting portion 5a3 of the turntable 5. The acceleration can be accurately applied to the first to fourth acceleration converters 12a to 12d.

The detection outputs of the first to fourth acceleration converters 12a to 12d are individually input to the multiplexer 31. This multiplexer 31 operates based on a control signal from the controller 32 for each output of the first to fourth acceleration converters 12a to 12d.
The detection outputs of the first to fourth acceleration converters 12a to 12d are selected for each of channels 1 to 4 corresponding to the acceleration converter 12d and output to the A/D converter 33.

Based on the output signal from the controller 32, the A/D converter 33 converts the analog detection outputs of each of the first to fourth acceleration converters 12a to 12d output from the multiplexer 31 into 12-bit digital signals. It is converted and output to the P-S converter 34.

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

In this modulator 35, based on the output signal of the controller 32, the output signal of the oscillator built in the modulator 35 is converted into "1" and "0" of the serial data sent from the P-S converter 34. ”, respectively 50KHz, 2
The primary winding 36 of the rotary transformer 36 is modulated to 5KHz.
Apply to P.

The serial data modulation signal induced in the secondary winding 36S of the rotary transformer 36 is input to the demodulator 37. The demodulator 37 modulates this modulation signal based on the output signal of the controller 38, outputs serial data of "1" and "0", and sends it to the S-P converter 39.

The S-P converter 39 converts the demodulated serial data signal sent from the demodulator 37 into parallel data based on the output signal from the controller 38, and converts the demodulated signal of the serial data sent from the demodulator 37 into parallel data. Each detection output of the acceleration converter 12d is latched into the latch circuits 40a to 40d based on a control signal from the controller 38.

The parallel data latched in each latch circuit 40a to 40d is sent to D/A converters 41a to 41d, and these D/A converters 41a to 41d convert the first to fourth acceleration converters 12a to 40d. The detection output of each device 12d is converted into an analog signal and output.

Furthermore, the outputs of the latch circuits 40a to 40d are each converted into 1 by the BCD converter 42 according to the binary coded decimal system.
The data is converted into decimal digits and output to the display device 43 for display.

On the other hand, the parallel data output from the S-P converter 39 is sent to the CPU 15 shown in FIG.
It is also possible to perform an analysis process on the detection output, and the result of this analysis process can be displayed on the display device 43 or printed out on the printer 18 by the operator operating the keyboard 16.

[0082] It is also possible to use a general-purpose personal computer in such an analysis processing system to perform product history management and to provide statistical processing functions.

Of course, a dedicated microcomputer can be used instead of the personal computer.

Next, by operating the switch 28, the setting of the rotational speed of the motor 4 is changed in a stepwise manner.
Stepwise acceleration is applied to the fourth acceleration converter 12d, and each output of the acceleration converter at that time can be derived, and therefore, multi-stage programming of acceleration settings can be realized. .

As described above, according to this embodiment, the turntable 5 is directly rotationally driven by the brushless motor 4, and the rotary shaft support 5a of the turntable 5 is freely rotatable in a non-contact state by the air bearing 6. The acceleration detection outputs of the plurality of acceleration converters supported and mounted and fixed on the turntable 5 are transmitted to the first acceleration converters 12a to 12a.
Each channel of the fourth acceleration converter 12d is inputted to the multiplexer 31, selected for each detection output of each acceleration converter, converted into a digital signal by the A/D converter 33, and then converted into a digital signal. The modulator 35 modulates "1" and "0" of the serial data to 50 KHz and 25 KHz, respectively, and the modulated signals are sent to the fixed part side through a rotating transformer 36 in a non-contact state. Since the signal is transmitted to the demodulator 37 located in the motor 4, noise generation and wear in the motor 4 are eliminated, and power consumption can be reduced. Furthermore, noise is not superimposed on the detection output, and the overall This has the advantage that it can be made compact.

Furthermore, since the rotation is supported by the air bearing 6, the rotation accuracy in both the thrust and radial directions can be increased to about 0.05 μm, and acceleration can be generated accordingly.

The present invention is not limited to the embodiments described above, and various modifications can be made without departing from the scope of the invention, such as using a magnetic bearing instead of an air bearing.

[0088]

Effects of the Invention As detailed above, according to the present invention, since the rotary drive of the turntable is directly driven by a brushless motor, firstly, there is no need for a clutch or a transmission mechanism, and the device The overall size can be reduced, and secondly, in addition to suppressing the generation of noise, it becomes easy to set the acceleration in multiple stages, and automatic programmed acceleration measurement becomes possible.

[0089] Furthermore, since the rotational support of the turntable is performed in a non-contact manner using air bearings, highly accurate rotational support is achieved for both thrust and radial directions, and in addition, noise generation is eliminated. , it is possible to perform highly accurate acceleration measurements.

Furthermore, since the acceleration detection output of each acceleration converter is amplified by a built-in amplifier and then transmitted via a rotary transformer, a non-contact state is maintained in this case as well, and as above, noise is reduced. It is possible to provide a centrifugal acceleration measuring device that can suppress the occurrence of mechanical wear and has no mechanically worn parts, and can also be used as a calibration device as a reference for acceleration generation.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway front view showing the overall configuration of an embodiment of a centrifugal acceleration measuring device according to the present invention.

FIG. 2 is a block diagram showing the overall schematic configuration of the embodiment of FIG. 1;

FIG. 3 is an enlarged sectional view of a portion related to the turntable and air bearing of the embodiment of FIG. 1;

FIG. 4 is a block diagram of a signal transmission system and a rotational drive system in the embodiment of FIG. 1;

FIG. 5 is an explanatory diagram showing the arrangement of analysis processing systems in the embodiment of FIG. 1;

6 is a characteristic diagram showing the relationship between command voltage and rotation speed of the motor in the embodiment of FIG. 1; FIG.

7 is a characteristic diagram showing the relationship between the rotational speed and jitter of the motor in the embodiment of FIG. 1; FIG.

8 is a characteristic diagram showing the relationship between command voltage and rotational speed of the motor in the embodiment of FIG. 1; FIG.

[Explanation of symbols]

1 Stone surface plate 2. Vibration isolation device 3. Support 4 Motor 5 Turntable 5a Rotating shaft support 5a3 Acceleration converter mounting part 5b Connecting block 6 Air bearing 6a　Air pressure supply section 6b Rotating part 7 Air cleaner 8 Air source 10 Cover 11 Safety cover 12a First acceleration converter 12b Second acceleration converter 12c Third acceleration converter 12d 4th acceleration converter 13,36 Rotating transformer 15 CPU 16 Keyboard 18 Printer 20 Pulse generator 21 Motor controller 22 Encoder 23 External power supply 24 Regulator 31 Multiplexer 32, 38 Controller 33 A/D converter 34 P-S converter 35 Modulator 36P primary winding 36S Secondary winding 37 Demodulator 39 S-P converter 40a-40d Latch circuit 41a-41d D/A converter 42 BCD converter 43 Display device

Claims (1)

[Claims] Claim 1: A turntable that is directly driven by a brushless motor and has an acceleration transducer mounting part for mounting an acceleration transducer to be measured formed at a part eccentric from the center of rotation, and a turntable that is rotatable. A supporting air bearing, a built-in amplifier that individually amplifies the output of the acceleration converter attached to the acceleration converter mounting part of the turntable, and a signal output from this built-in amplifier is transmitted to the fixed part side. a rotating transformer, applying a predetermined acceleration to the acceleration converter to be measured by changing the rotational speed of the brushless motor, and fixing the output of the acceleration converter to be measured at that time via the rotating transformer. A centrifugal acceleration measuring device characterized in that it is configured to lead out to the side.