JP2842466B2 - Torque measuring 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 torque measuring device capable of detecting the magnitude of a torque applied to a torque detecting shaft and outputting a torque signal.

[0002]

2. Description of the Related Art As a known torque measuring device, a pair of magnetic anisotropic portions are formed on the outer peripheral surface of a torque transmitting shaft, and the magnetic permeability of each magnetic anisotropic portion when a torque is applied to the shaft is measured. The change is detected by a pair of detection coils arranged near these magnetic anisotropic parts, and the magnitude of the torque acting on the shaft is converted into an electric signal from the difference between the two detection signals. Have been.

In such a known torque measuring device, the detection output when no torque acts on the shaft, that is, the zero-point output, the detection sensitivity, and the like vary depending on various factors such as the ambient temperature. The causes of fluctuations in the detection output include imbalance between the magnetically anisotropic portions on both sides formed on the shaft, imbalance in the characteristics of the shields on both sides, and imbalance in the characteristics of the bobbins and coils on both sides. . For example, if a magnetically anisotropic part is formed in a knurled groove formed by rolling and then subjected to heat treatment and shot peening after rolling, the imbalance of the magnetically anisotropic part is affected by the depth of the formed groove and This is caused by an imbalance in width, an imbalance in heat treatment, an imbalance in shot peening, and the like.

Conventionally, in order to correct such a variation in the detection output, a correction resistor is provided as shown in, for example, Japanese Patent Application No. 3-31137. Replacement, selection of a correction resistor using a dip switch, adjustment of a correction resistor using a variable resistor, and the like are performed.

[0005]

However, such conventional corrections are all performed manually, and are liable to be inaccurate, and require a long time for the correction work. Accordingly, it is an object of the present invention to solve such a problem and to enable the characteristic correction of the torque sensor to be performed reliably and in a short time without manual intervention.

[0006]

SUMMARY OF THE INVENTION In order to achieve this object, the present invention detects the magnitude of torque applied to a torque detecting shaft and outputs a torque signal of the torque. And a torque sensor having a second mode for correcting the detection characteristic thereof, the torque sensor being connected to a characteristic inspection device to perform one of the two modes. Configured to be able to receive an external signal from the characteristic inspection device for selection,
The characteristic inspection apparatus is configured to collect inspection data from the torque sensor and create characteristic correction data of the torque sensor based on the collected inspection data, and the torque sensor is configured to perform the second mode And a memory capable of writing characteristic correction data from the characteristic inspection device and reading the characteristic correction data for correcting a torque signal in the first mode.

[0007]

According to such a configuration, in the second mode based on the selection by the characteristic inspection device, the characteristic inspection device collects the inspection data from the torque sensor and generates the inspection data based on the collected inspection data. The characteristic correction data of the torque sensor is created, and the memory of the torque sensor is capable of writing the characteristic correction data from the characteristic inspection device in the second mode and for correcting the torque signal in the first mode. Since the characteristic correction data can be read out, the detection characteristic is automatically corrected in the torque sensor, and therefore, the correction can be performed reliably and in a short time without requiring any manual operation.

[0008]

In FIG. 1, reference numeral 1 denotes a torque sensor, 2 denotes a characteristic inspection device, and both are connected to each other by a torque signal line 3 and a data input / output line 4. FIG.
2 shows a detailed structure of an analog correction type torque sensor 1.
Here, reference numeral 6 denotes a torque detection shaft, which is formed of a material having soft magnetism and magnetostriction. On the outer periphery of the shaft 6, a pair of magnetically anisotropic parts 7, 7 which are inclined at an angle of ± 45 degrees with respect to the direction of the axis of the shaft 6 and are inclined in opposite directions are formed by a large number of grooves or the like. ing. The large number of grooves are formed, for example, by rolling the shaft 6, and the properties thereof are improved by performing heat treatment or shot peening after the rolling.

Around the magnetic anisotropic parts 7, 7, a pair of detecting coils 8, 8 corresponding to the magnetic anisotropic parts 7, 7, and an exciting coil for exciting these detecting coils 8, 8 are provided. 9,
9 are provided. The excitation coils 9, 9 are connected to an oscillation circuit 10 for supplying an alternating current. Output lines from each of the detection coils 8 and 8 are connected to a rectifier circuit 1 respectively.
It is connected to a differential amplifier 12 via 1 and 11. The output line from the differential amplifier 12 is connected via a filter 13 to a differential amplifier 14 for zero correction. V1 is a filter
The output signal from 13 is shown. The differential amplifier 14 has a signal Vz for making the sensor output zero when the torque is zero.
Is input via a constant voltage generating circuit 15 and a D / A converter 16. V2 is an output signal from the differential amplifier 14.

An output line from the differential amplifier 14 is connected to a differential amplifier 17 for correcting a zero point fluctuation caused by a temperature change. The output line from the D / A converter 18 is connected to the differential amplifier 17, and Vzt is its signal. V3
Is an output signal from the differential amplifier 17. Differential amplifier 17
Are connected to a D / A converter 20 for sensitivity correction. An output line from the D / A converter 20 is connected to a D / A converter 21 for correcting sensitivity fluctuations due to a temperature change. V4 is an output signal from the D / A converter 20. The above-mentioned torque signal line 3 is connected to the output side of the D / A converter 21, and the signal V5 is output to the output line 3.

An output line from an arithmetic and control circuit 23 provided in the torque sensor 1 is connected to each of the D / A converters 16, 18, 20, 21. The arithmetic control circuit 23 is provided with a memory 24. The data input / output line 4 is connected to the arithmetic control circuit 23. Reference numeral 25 denotes a temperature sensor capable of detecting the temperature of the torque sensor 1. The output line from the temperature sensor 25 is connected to the arithmetic and control circuit 23 via the A / D converter 26. V6 is an output signal from the A / D converter 26.

In such a configuration, the torque sensor 1
Can be selectively switched between a measurement mode and a correction mode. In the measurement mode, a torque signal corresponding to the magnitude of the torque applied to the shaft 6 is obtained based on the output signals of the detection coils 8 and 8. In the correction mode, at least one of a zero point correction, a sensitivity correction, a correction of a zero point change due to a temperature change, and a correction of a sensitivity change due to a temperature change is added to the torque signal as necessary. It is done in a manner.

First, zero point correction in the correction mode, that is, zero balance correction will be described. In this case,
The output signal V1 when no torque is applied to the shaft 6 at normal temperature, for example, 25 ° C., is output to the torque signal line 3 as it is, and the value is measured by the characteristic inspection device 2. Then, zero point correction data for the sensor is calculated from the measured data, and the calculation result is written from the data input / output line 4 to the memory 24 in the sensor 1 via the calculation control circuit 23. The arithmetic control circuit 23 reads out the zero point correction data from the memory 24 and writes it to the D / A converter 16. Then, this D /
The output Vz of the A converter 16 becomes Vz = V1, and zero point correction is performed. At this time, V2 = V3 = V4 = V5 = 0.

Next, the sensitivity correction will be described. First, a rated torque is applied to the shaft 6 at normal temperature, for example, 25 ° C., and an output signal at that time is measured by the characteristic inspection device 2. Then, sensor sensitivity correction data is calculated from the measured data, and the sensor 1
Write to the memory 24 inside. The arithmetic control circuit 23 reads out the sensitivity correction data from the memory 24 and writes it into the D / A converter 20. Then, the output V4 of the D / A converter 20 becomes a constant voltage corresponding to the rated torque, thereby performing the sensitivity correction.

Next, the correction of the zero point fluctuation due to the temperature change will be described. First, the torque sensor 1 is placed in a constant temperature bath, the temperature in the bath is changed without applying a torque to the shaft 6, and the sensor output V5 at this time is measured by the characteristic inspection device 2. At the same time, the output V6 of the temperature sensor 25 inside the torque sensor 1 is measured by the characteristic inspection device 2 via the arithmetic control circuit 23 and the data input / output line 4. Characteristic inspection device 2
Calculates data for correction of zero point fluctuation due to temperature change from these measurement data, and calculates the calculation result as
The data is written from the data input / output line 4 to the memory 24 in the sensor 1 via the arithmetic control circuit 23.

When the ambient temperature of the torque sensor 1 changes, the output V6 of the temperature sensor 25 inside the sensor changes accordingly. Then, in accordance with the output V6, the arithmetic control circuit 23 reads data for correcting zero point fluctuation due to temperature change from the memory 24, and writes the data to the D / A converter 18. As a result, even if the ambient temperature of the sensor 1 changes, the sensor output in a state where no torque is applied to the shaft 6
V5 is always zero.

Next, correction of sensitivity fluctuation due to temperature change will be described. First, the torque sensor 1 is put in a thermostat, the temperature in the chamber is changed, and a sensor output V5 when a constant torque is applied to the shaft 6 at each temperature, that is, data on sensor sensitivity is measured by the characteristic inspection device 2. I do. At the same time, the output V6 of the temperature sensor 25 inside the torque sensor 1 is
Measurement is performed by the characteristic inspection device 2 via the arithmetic control circuit 23 and the data input / output line 4. The characteristic inspection device 2 calculates data for correcting sensitivity fluctuations due to temperature changes from these measurement data, and outputs the calculation result from the data input / output line 4 via the calculation control circuit 23 to the inside of the sensor 1. Write to memory 24.

When the ambient temperature of the torque sensor 1 changes and the output V6 of the temperature sensor 25 changes, the arithmetic control circuit 23
Reads data from the memory 24 for correcting sensitivity fluctuations due to temperature changes in accordance with the output V6, and writes the data to the D / A converter 21. As a result, the sensor 1
Even if the ambient temperature changes, the sensor sensitivity can always be corrected to be constant.

The measurement mode will be described. When the power of the circuit is turned on, the arithmetic and control circuit 23 reads the zero point correction data and the sensitivity correction data from the memory 24, and
Write to the / A converter 16 and the D / A converter 20. Further, immediately after the power is turned on, the arithmetic control circuit 23, based on the output V6 of the temperature sensor 25, calculates data for correcting zero point fluctuation due to temperature change and data for correcting sensitivity fluctuation due to temperature change. Read from memory 24 and
Write to the / A converter 18 and the D / A converter 21.

The zero point correction and the sensitivity correction are performed based on the data written in the D / A converters 16 and 20. Further, based on the data written to the D / A converters 18 and 21, the correction is performed so that the zero point and the sensitivity of the torque sensor become constant even when the ambient temperature of the torque sensor changes. FIG. 3 shows a detailed structure of the digital correction type torque sensor 1. Here, the output line from the filter 13 provided on the output side of the differential amplifier 12 is connected to the A / D converter 31.
Is connected to the arithmetic and control circuit 23 via the. Further, the torque signal line 3 is transmitted from the arithmetic control circuit 23 to the D / A converter 32.
Has been derived through.

In the torque sensor 1 of the digital correction type, the same zero point correction, sensitivity correction, correction of zero point fluctuation due to temperature change, and correction of sensitivity fluctuation due to temperature change as in the analog type are calculated. This is performed by digital operation in the control circuit 23. First, in the correction mode, the sensor output signal V5 and the temperature sensor
The 25 output signals V6 are measured by the characteristic inspection apparatus 2, and from these measured data, zero-point correction data, sensitivity correction data, correction data of zero-point fluctuation due to temperature change, and correction of sensitivity fluctuation due to temperature change Calculate with data. The calculation result is written from the data input / output line 4 to the memory 24 in the sensor 1 via the calculation control circuit 23. The output signal V1 of the sensor unit, that is, the filter 13, and the output signal of the temperature sensor 25 are obtained by converting the data converted into digital data by the A / D converters 31 and 26 into the arithmetic control circuit 23 and the data input / output line. 4 to the characteristic inspection apparatus 2. In this way, the output of the torque sensor and the temperature can be measured by the characteristic inspection device 2.

In the measurement mode, when the power is turned on, the arithmetic and control circuit 23 reads the above-mentioned data from the memory 24. Further, an output V1 relating to the torque and an output V6 relating to the temperature are measured, a corrected torque signal is calculated based on each data, and this is output as a torque signal V5. FIG. 4 shows a torque sensor 1 according to a modified embodiment of the present invention. Here, only one magnetic anisotropic part 7 inclined with respect to the axis is formed on the outer peripheral surface of the torque detection shaft 6.
A coil 41 is arranged around the magnetic anisotropic part 7.

The coil 41 is indicated by a solid line in the drawing, and supplies an alternating current to the coil 41 via a resistor 43 and a temperature-sensitive resistor 42 for roughly adjusting a zero point variation due to a temperature change. Connected to the oscillation circuit 10. The temperature sensing resistor 42 can be provided between the resistor 43 and the coil 41 as shown by a broken line in the drawing, or can be provided at another place. The resistance 43 is the coil 41
Has a resistance value approximately equal to the impedance of A rectifier circuit 45 is connected in parallel between the oscillation circuit 10 and the temperature-sensitive resistor 42, and a low-pass filter 46 is provided on the output side of the rectifier circuit 45.
Are connected to form an excitation voltage detection circuit 47.

A rectifier circuit 48 and a low-pass filter 49 are connected to an output line from the coil 41, that is, a line in parallel with the temperature-sensitive resistor 42 indicated by a broken line in the figure, to constitute a torque detecting circuit 50. I have. The output side of the low-pass filter 49 in the torque detection circuit 50 and the output side of the low-pass filter 46 in the excitation voltage detection circuit 47 are both connected to the input side of the differential amplifier 51. The output side of the differential amplifier 51 is connected to the amplifier 52 via the differential amplifier 14 for zero point correction.

The output side of the amplifier 52 is connected to a polarity determining circuit 53 for detecting the direction of the torque applied to the torque detecting shaft 1 by a known method, and a gain switching circuit 54. In the gain switching circuit 54, a pair of D / A converters 5 for performing sensitivity correction and correction of sensitivity fluctuation due to temperature change are provided.
5 and 56 are connected in parallel, and each D / A converter 55 and 56 operates upon receiving a signal from the arithmetic and control circuit 23. One D / A
A switch 57 is provided in the parallel circuit corresponding to the converter 56. The output side of the polarity judging circuit 53 is connected to a control signal input section of the switch 57 so that the gain of the torque detection signal from the amplifier 52 can be switched based on the direction of the torque applied to the torque detection shaft 6. Both D / A converters 55 and 56
Is connected to an adder 58, from which the sensor output V5 appears on the torque signal line 3. 59 is a feedback line, which is an arithmetic and control circuit via an A / D converter 60
Connected to 23.

In such a configuration, the oscillation circuit 10
The excitation voltage Vex is supplied to the coil 41. At this time, when a torque is applied to the torque detection shaft 6, the magnetic permeability of the magnetically anisotropic part 7 changes, thereby changing the impedance of the coil 41. At this time, the torque detection voltage corresponding to the impedance change of the coil 41, that is, the change in the coil output, becomes the maximum and the torque detection sensitivity becomes the maximum, because the resistance value of the resistor 43 connected in series to the coil 41 Is equal to the impedance of the coil 41. Therefore, as described above, the resistance value of the resistor 43 is
By making the impedance almost equal to 41, the torque detection sensitivity becomes large.

That is, although the torque detecting shaft 6 has only a single magnetic anisotropic portion 7, the torque detecting sensitivity can be maximized, and the accuracy of the sensor can be improved. Therefore, the torque detection shaft 6 can be configured to be short,
Also, the number of coils 41 and the number of bobbins around which the coils 41 are wound can be reduced by half as compared with the conventional case, and the shape of the shield case accommodating them can be simplified. As a result, a small, high-precision torque sensor can be obtained.

If the exciting voltage Vex changes for some reason, the output of the detection voltage also changes, but the rate of change becomes equal to the rate of change of the exciting voltage Vex. On the other hand, in the differential amplifier 51, the output of the filter 46 of the excitation voltage detection circuit 47 is subtracted from the output of the filter 49 of the torque detection circuit 50. Therefore, there is an advantage that no matter how the excitation voltage Vex changes, the torque output does not change.

The temperature characteristic of the torque detection output is measured in advance, and the output of the differential amplifier 51 becomes zero so that the output V1 of the differential amplifier 51 becomes zero when no torque acts on the torque detection shaft 6. A resistance value, that is, a correction constant is determined in advance. In this way, even if a temperature change occurs in the torque sensor, an output V1 whose output fluctuation is roughly compensated for appears in the differential amplifier 51 in accordance with the temperature change. Eventually, the output V1 of the differential amplifier 51 appears to prevent the occurrence of an error based on the fluctuation of the excitation voltage Vex of the oscillation circuit 10 and to roughly prevent the occurrence of the error based on a temperature change.

The output V1 of the differential amplifier 51 is zero-corrected by the differential amplifier 14, as in the embodiment of FIG. That is, the zero point fluctuation due to the temperature change is roughly adjusted by the above-described temperature-sensitive resistor 42, and then the differential amplifier 14
Fine-tuned by Further, the D / A converter 16 and the differential amplifier 14 of this embodiment are the same as those of the embodiment shown in FIG.
It also has the functions of the A converter 18 and the differential amplifier 17, and the output V 3 appears on the differential amplifier 14. That is, in this embodiment, the D / A converter 16 performs not only the zero point correction but also the fine adjustment of the zero point fluctuation due to the temperature change.

The output of the amplifier 52 is input to a gain switching circuit 54 and a polarity judgment circuit 53. Generally, when only one magnetic anisotropic portion 7 is provided, the torque detection sensitivity differs between when a clockwise torque is applied and when a counterclockwise torque is applied, and the torque output differs. Become something. Therefore, the direction of the applied torque is determined from the output of the amplifier 52 by the polarity determination circuit 53, and the switch 57 is opened and closed based on the direction of the applied torque.

When the switch 57 is in the open state, only the D / A converter 55 operates to perform sensitivity correction and correction of sensitivity variation due to temperature change. A later output V5 appears. When the switch 57 is closed, both D / A converters 55 and 56 operate,
The correction is performed by both, and the correction value is added by the adder 58, so that the output V5 corresponding thereto appears. As a result, torques in either direction are detected with equal sensitivity, and torques in both directions are correctly detected and finally output. In this embodiment, the output V5 as the final torque detection value is input to the arithmetic and control circuit 23 via the A / D converter 60, and is used for each correction.

FIG. 5 shows a modified embodiment of the present invention in which only one magnetic anisotropic portion 7 is provided corresponding to FIG. 4, but the correction method is the same as that of FIG. The following is an example. The operation is the same as that of the embodiment shown in FIGS. FIG. 6 shows a torque sensor according to a further modified embodiment of the present invention. As in the case of FIG. 4, the magnetic anisotropic part 7 is formed only at one place, and around this magnetic anisotropic part 7, a detection coil 61 and an exciting coil 62 are arranged. The excitation coil 62 is connected to the oscillation circuit 10, and this oscillation circuit 10 and the excitation coil 62
Is connected in series with a resistor 63 for stabilizing the exciting current. The excitation voltage detection circuit 47 is connected in parallel to the resistor 63 and the excitation coil 62, and has a gain temperature characteristic correction circuit 64. Further, here, the differential amplifier 14 for zero point correction is provided in the torque detection circuit 50 composed of the output line from the detection coil 61.

In such a configuration, the oscillation circuit 10
The exciting voltage Vex is supplied to the resistor 63 and the exciting coil 62 connected in series with each other. When a torque is applied to the torque detection shaft 6, the magnetic permeability of the magnetic anisotropic part 7 changes, and the impedance of the coil changes, thereby
The magnitude of the applied torque is required. By the way, it is possible to configure a torque sensor having various capacities by using the same electronic circuit. In this case, the shaft diameter of the torque detection shaft 6 is changed. Then, the coil impedance changes correspondingly. However, in this embodiment, the detection coil 61 and the excitation coil 62 are provided as in the case of the embodiment of FIGS. Even if the impedance changes, it is not necessary to make the resistance value of the series resistor 63 substantially equal to the impedance of the exciting coil 62 as in the case of using a single coil as in the embodiments of FIGS. Accordingly, if the magnitude of the excitation voltage Vex and the value of the resistor 63 are set so that the value of the excitation current flowing through the excitation coil 62 becomes substantially constant, the detection coil 61 is configured such that the number of turns of the detection coil and the excitation current A detection voltage proportional to the product is output, and the value changes with high sensitivity according to the torque applied to the torque detection shaft 6. Further, by increasing the number of turns of the detection coil 61, a large detection voltage can be obtained with the same excitation voltage, and a torque sensor with good performance that is not easily affected by noise or drift of the torque detection circuit can be obtained.

When the excitation voltage Vex changes for some reason, the detection output of the torque detection circuit 50 and the output of the excitation voltage detection circuit 47 also change, and the rate of change is the same as the rate of change of the excitation voltage Vex. Become equal. On the other hand, in the differential amplifier 51, the difference between the output of the excitation voltage detection circuit 47 and the output of the torque detection circuit 50 is obtained. Therefore, there is an advantage that no matter how the excitation voltage Vex changes, the output V1 of the differential amplifier 51 does not change.

The temperature characteristic of each output is measured in advance, and a correction constant of the gain temperature characteristic correction circuit 64 is set so that the output of the differential amplifier 51 becomes zero when the torque is not applied to the shaft 6 and the torque is zero. Is determined. By doing so, when a temperature change occurs in the torque sensor, the zero point temperature correction is roughly adjusted in accordance with the temperature change.
The fine adjustment of the temperature correction of the zero point is performed by the signal V sent from the D / A converter 16 to the differential amplifier 14 provided in the torque detection circuit 50.
z, done by Vzt.

In the above description, the gain temperature characteristic correction circuit 64 is provided in the excitation voltage detection circuit 47. However, the gain temperature characteristic correction circuit 64 is replaced with a torque detection circuit 50 as shown by a broken line in FIG. Function similarly. FIG. 7 shows a modified embodiment of the one shown in FIG.
Here, the gain temperature characteristic correction circuit 64 is provided in a series circuit including the resistor 63 and the exciting coil 62. Other configurations are the same as those of the embodiment of FIG.

FIG. 8 shows a modified embodiment of the present invention in which a detection coil 61 and an exciting coil 62 are provided corresponding to FIG. 7, and the correction method is digital correction in the same manner as in FIGS. An example of the method will be described. In this embodiment, the temperature sensor
Based on the output V6 of 25, the signals Vz and Vzt are sent from the arithmetic and control circuit 23 to the differential amplifier 14 via the D / A converter 65, whereby fine adjustment of the zero point temperature correction is performed. Other operations are the same as those of the embodiment shown in FIGS. 3, 5, and 7, respectively.

It is apparent that the technical concept of the present invention can be applied to various sensors such as a load cell and a pressure sensor other than the torque sensor described above.

[0040]

As described above, according to the present invention, in the second mode based on the selection by the characteristic inspection device, the characteristic inspection device collects inspection data from the torque sensor and collects the inspection data. The characteristic correction data of the torque sensor is created based on the inspection data obtained. The memory of the torque sensor is capable of writing the characteristic correction data from the characteristic inspection device in the second mode and the torque signal in the first mode. Since the characteristic correction data can be read out for the correction of the detection characteristic, the detection characteristic can be automatically corrected in the torque sensor, and therefore, the correction can be performed reliably and in a short time without requiring any manual operation. Can be.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a torque measuring device according to an embodiment of the present invention.

FIG. 2 is a detailed block diagram of an analog correction type torque sensor.

FIG. 3 is a detailed block diagram of a digital correction type torque sensor.

FIG. 4 is a detailed block diagram of another analog correction type torque sensor.

FIG. 5 is a detailed block diagram of another digital correction type torque sensor.

FIG. 6 is a detailed block diagram of another analog correction type torque sensor.

FIG. 7 is a detailed block diagram of a modified example of the torque sensor shown in FIG. 6;

FIG. 8 is a detailed block diagram of still another digital correction type torque sensor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torque sensor 2 Characteristic inspection device 3 Torque signal line 4 Data input / output line 23 Operation control circuit 24 Memory 25 Temperature sensor

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kazunori Sakunaga 2-35 Jinmucho, Yao-shi, Osaka Inside Kubota Kuhoji Plant (72) Inventor Takuji Mori 2-35 Jinmucho, Yao-shi, Osaka Co., Ltd. (56) References JP-A-1-173842 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G01L 25/00 G01L 3/00-3/14

Claims (7)

(57) [Claims] The present invention is capable of detecting a magnitude of a torque applied to a torque detection shaft and outputting a torque signal of the torque, and a first mode for outputting the torque signal and a correction of the detection mode. It has a torque sensor and a second mode for, the torque sensor is connected to a characteristic test device receives the external signal from the characteristic test device to select one of the two modes capable constructed, the characteristic test device, the test data from said torque sensor
Data and collect data based on the collected inspection data.
It is configured to create characteristic correction data for
In the second mode, the torque sensor has the characteristic
That the characteristic correction data from the tester can be written
Both are for correcting the torque signal in the first mode.
And a memory capable of reading the characteristic correction data . 2. In a first mode, characteristic correction data is read from a memory, and a zero point correction and
2. The torque measuring device according to claim 1, further comprising: means for performing at least one of a sensitivity correction, a correction of a zero-point variation due to a temperature change, and a correction of a sensitivity variation due to a temperature change. 3. A torque sensor, comprising: a single magnetic anisotropic portion formed on an outer peripheral surface of a torque transmission shaft; a coil provided around the magnetic anisotropic portion; and an exciting voltage applied to the coil. Means for obtaining a torque detection signal from the coil, and a resistor provided in series between the coil and the exciting voltage supply means and having a resistance substantially equal to the impedance of the coil. The torque measuring device according to claim 1 or 2, wherein: 4. A torque sensor comprising: a single magnetic anisotropic portion formed on an outer peripheral surface of a torque detecting shaft; an exciting coil and a detecting coil provided around the magnetic anisotropic portion; Means for obtaining a torque detection signal from the output of the above, means for supplying an excitation voltage to the excitation coil, and a resistor provided in series between the excitation coil and the excitation voltage supply means for stabilizing the excitation current. The torque measuring device according to any one of claims 1 to 3, wherein: 5. An apparatus comprising: means for obtaining an excitation voltage signal from an excitation voltage value of an excitation voltage supply means; and arithmetic means for calculating a difference between a torque detection signal and an excitation voltage signal to compensate for a change in the excitation voltage value. The torque measuring device according to claim 3 or 4, wherein: 6. A temperature characteristic compensator for adjusting a gain of at least one of a torque detection signal and an excitation voltage signal to compensate for a measurement error based on a temperature change. Torque measuring device. 7. The apparatus according to claim 1, further comprising: means for detecting a direction of the torque applied to the torque transmitting shaft; and means for switching a gain of the torque detection signal based on the direction of the applied torque. The torque measuring device according to claim 1.