Time storage function-attached electric instrument

Abstract

To achieve a time storage function-attached angle detection device that can acquire information on time when abnormality occurs.SOLUTION: A time storage function-attached angle detection device comprises: a rotation detection unit 1; an abnormality detection unit 2 that detects abnormality of the rotation detection unit 1; a clock part 3 that counts time; and a storage unit 4 in which, in a case where the abnormality detection unit 2 detects the abnormality, the time the clock part 3 counts when the abnormality detection unit 2 detects the abnormality is stored. Power is switched from any one of a host machine 9 and a backup power source part 6, and supplied to the rotation detection unit 1, and when the abnormality detection unit 2 detects the abnormality of the rotation detection unit 1 in a state where the power is supplied to the rotation detection unit 1 from the backup power source part 6, the time the clock part 3 counts when the abnormality detection unit 2 detects the abnormality is stored in the storage unit 4.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] This invention relates to an electric device with a time memory function.

Background Art

[0002] Conventionally, an optical encoder including a light source, a photoelectric conversion element, and an arithmetic unit has been known. Light emitted from the light source irradiates the photoelectric conversion element. The arithmetic unit detects the rotation angle using the output of the photoelectric conversion element, and also detects an abnormality of the light source or the photoelectric conversion element (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the configuration described in Patent Document 1, when an abnormality occurs, the time at which the abnormality occurred is unknown. As a result, there is a problem that information on the time at which the abnormality occurred cannot be used when analyzing the cause of the occurrence of the abnormality.

[0005] This invention has been made to solve the above-described problems, and an object thereof is to provide an electric device with a time memory function capable of acquiring information on the time at which an abnormality occurred.

Means for Solving the Problems

[0006] The electric device with a time memory function according to this invention includes an abnormality detection target unit, an abnormality detection unit that detects an abnormality of the abnormality detection target unit, a clock unit that measures time, and a memory unit that stores the time measured by the clock unit when the abnormality detection unit detects an abnormality when the abnormality detection unit detects an abnormality. In the electrical device with a time memory function according to the present invention, power is supplied to the abnormality detection target part by switching from either the external device or the backup power supply part, and when the abnormality detection part detects an abnormality while power is being supplied from the backup power supply part to the abnormality detection target part, the time is stored in the storage part. In the electrical device with a time memory function according to the present invention, when the abnormality detection part detects an abnormality while power is being supplied from the external device to the abnormality detection target part, the time is not stored in the storage part. In the electrical device with a time memory function according to the present invention, the clock part receives a standard radio wave and corrects the measured time using the received standard radio wave. In the electrical device with a time memory function according to the present invention, the clock part receives time information from an external device and corrects the measured time using the received time information. The electrical device with a time memory function according to the present invention includes a communication part that outputs the time stored in the storage part to an external device when the abnormality detection part detects an abnormality. In the electrical device with a time memory function according to the present invention, when the abnormality detection part detects an abnormality, the communication part outputs an abnormality occurrence signal indicating that an abnormality has occurred in the abnormality detection target part to the external device. In the electrical device with a time memory function according to the present invention, the abnormality detection part includes an impact measurement part that measures the impact acting on the abnormality detection target part, and an impact abnormality determination part that determines whether an abnormality has occurred in the abnormality detection target part based on the measurement result of the impact measurement part. In the electrical device with a time memory function according to the present invention, the abnormality detection part includes a temperature and humidity measurement part that measures the temperature or humidity of the abnormality detection target part, and a temperature and humidity abnormality determination part that determines whether an abnormality has occurred in the abnormality detection target part based on the measurement result of the temperature and humidity measurement part. In the electrical device with a time memory function according to the present invention, the abnormality detection target part is a rotation detection part that detects the rotation angle of the detection target axis.

Effect of the Invention

[0007] According to the electrical device with a time memory function according to the present invention, it is possible to acquire information on the time when an abnormality occurred.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Modes for Carrying Out the Invention

[0009] Embodiment 1. FIG. 1 is a block diagram showing an angle detection device with a time memory function according to Embodiment 1. The angle detection device with a time memory function, which is an electrical device with a time memory function, includes a rotation detection unit 1 that is an abnormality detection target unit, an abnormality detection unit 2, a clock unit 3, a memory unit 4, a power supply switching unit 5, a backup power supply unit 6, a communication unit 7, and a control unit 8.

[0010] The rotation detection unit 1 is attached to a detection target axis (not shown). The rotation detection unit 1 detects the rotation angle of the detection target axis. Examples of the rotation detection unit 1 include an encoder and a resolver. The detection result of the rotation detection unit 1 is input to the control unit 8.

[0011] The abnormality detection unit 2 detects an abnormality in the rotation detection unit 1. FIG. 2 is a block diagram showing the abnormality detection unit 2 of FIG. 1. The abnormality detection unit 2 includes a shock measurement unit 201 and a shock abnormality determination unit 202.

[0012] The shock measurement unit 201 measures the shock acting on the rotation detection unit 1. The shock measurement unit 201 is composed of an acceleration measurement device. Note that the shock measurement unit 201 is not limited to an acceleration measurement device, and any device that can measure shock may be used. The measurement result of the shock measurement unit 201 is input to the shock abnormality determination unit 202.

[0013] The impact abnormality determination unit 202 is preset with an impact abnormality determination threshold, which is a threshold used when determining the abnormality of an impact. The impact abnormality determination unit 202 compares the measurement result of the impact measurement unit 201 with the impact abnormality determination threshold to determine whether an abnormality has occurred in the rotation detection unit 1. In other words, the impact abnormality determination unit 202 determines whether an abnormality has occurred in the rotation detection unit 1 based on the measurement result of the impact measurement unit 201. The determination result of the impact abnormality determination unit 202 is input to the control unit 8. In other words, the detection result of the abnormality detection unit 2 is input to the control unit 8.

[0014] The clock unit 3 measures time. The clock unit 3 receives a standard radio wave and uses the received standard radio wave to correct the time to be measured. The measurement result of the clock unit 3 is input to the control unit 8.

[0015] The power supply switching unit 5 is connectable to a host computer 9, which is an external device. Also, a backup power supply unit 6 is connected to the power supply switching unit 5. The power supply switching unit 5 switches between the host computer 9 and the backup power supply unit 6 and sends power to the control unit 8. Specifically, when the host computer 9 is connected to the power supply switching unit 5, the power of the host computer 9 is sent to the control unit 8, and when the host computer 9 is not connected to the power supply switching unit 5, the power of the backup power supply unit 6 is sent to the control unit 8.

[0016] Information on which of the host computer 9 and the backup power supply unit 6 the power is being sent from to the control unit 8 is defined as power switching information. The power switching information is input from the power supply switching unit 5 to the control unit 8.

[0017] The communication unit 7 is connectable to the host computer 9. When the host computer 9 is connected to the communication unit 7, communication between the communication unit 7 and the host computer 9 becomes possible. The communication unit 7 is controlled by the control unit 8.

[0018] The control unit 8 supplies power sent from the power supply switching unit 5 to the rotation detection unit 1, the abnormality detection unit 2, and the clock unit 3. Therefore, when the host computer 9 is connected to the power supply switching unit 5, the power of the host computer 9 is supplied to the rotation detection unit 1, the abnormality detection unit 2, and the clock unit 3. On the other hand, when the host computer 9 is not connected to the power supply switching unit 5, the power of the backup power supply unit 6 is supplied to the rotation detection unit 1, the abnormality detection unit 2, and the clock unit 3.

[0019] When the host computer 9 is not connected to the power supply switching unit 5, each of the detection result of the rotation detection unit 1, the detection result of the abnormality detection unit 2, and the measurement result of the clock unit 3 is stored in the storage unit 4 by the control unit 8. Therefore, when the abnormality detection unit 2 detects an abnormality of the rotation detection unit 1 while power is being supplied from the backup power supply unit 6 to the rotation detection unit 1, the control unit 8 causes the storage unit 4 to store the time measured by the clock unit 3 when the abnormality detection unit 2 detects the abnormality.

[0020] When the host computer 9 is connected to the power supply switching unit 5, each of the detection result of the rotation detection unit 1, the detection result of the abnormality detection unit 2, and the measurement result of the clock unit 3 is output from the communication unit 7 to the host computer 9 under the control of the control unit 8. Therefore, when the abnormality detection unit 2 detects an abnormality of the rotation detection unit 1 while power is being supplied from the host computer 9 to the rotation detection unit 1, the control unit 8 does not store the time measured by the clock unit 3 when the abnormality detection unit 2 detects the abnormality in the storage unit. In this case, the control unit 8 causes the communication unit 7 to output an abnormality occurrence signal indicating that an abnormality has occurred in the rotation detection unit 1 and the time measured by the clock unit 3 when the abnormality detection unit 2 detects the abnormality to the host computer 9.

[0021] When the host computer 9 is connected to the power supply switching unit 5, each of the detection result of the rotation detection unit 1, the detection result of the abnormality detection unit 2, and the measurement result of the clock unit 3, which were stored in the storage unit 4 when the host computer 9 was not connected to the power supply switching unit 5, is output from the communication unit 7 to the host computer 9 under the control of the control unit 8.

[0022] Next, the operation of the angle detection device with an abnormal memory function will be described. First, the case where the host computer 9 is not connected to the power supply switching unit 5 will be described. When the host computer 9 is not connected to the power supply switching unit 5, power is supplied from the backup power supply unit 6 to the rotation detection unit 1, the abnormality detection unit 2, and the clock unit 3.

[0023] When power is supplied from the backup power supply unit 6, the detection result of the rotation detection unit 1, the detection result of the abnormality detection unit 2, and the measurement result of the clock unit 3 are stored in the storage unit 4.

[0024] Next, the case where the host computer 9 is connected to the power supply switching unit 5 will be described. When the host computer 9 is connected to the power supply switching unit 5, power is supplied from the host computer 9 to the rotation detection unit 1, the abnormality detection unit 2, and the clock unit 3.

[0025] When power is supplied from the host computer 9, the detection result of the rotation detection unit 1, the detection result of the abnormality detection unit 2, and the measurement result of the clock unit 3 are output from the communication unit 7 to the host computer 9 under the control of the control unit 8.

[0026] Also, when power is supplied from the host computer 9, the detection result of the rotation detection unit 1, the detection result of the abnormality detection unit 2, and the measurement result of the clock unit 3 stored in the storage unit 4 are output from the communication unit 7 to the host computer 9 under the control of the control unit 8.

[0027] As described above, the angle detection device with a time memory function according to Embodiment 1 includes a rotation detection unit 1, an abnormality detection unit 2 that detects an abnormality of the rotation detection unit 1, a clock unit 3 that measures time, and a memory unit 4. When the abnormality detection unit 2 detects an abnormality of the rotation detection unit 1, the time measured by the clock unit 3 at the time when the abnormality detection unit 2 detects the abnormality of the rotation detection unit 1 is stored in the memory unit 4. According to this configuration, the time when the abnormality detection unit 2 detects the abnormality of the rotation detection unit 1 is stored in the memory unit 4. Thereby, information on the time when the abnormality of the rotation detection unit 1 occurs can be obtained. As a result, when analyzing the cause of the occurrence of the abnormality of the rotation detection unit 1, the information on the time when the abnormality of the rotation detection unit 1 occurs can be used. By using the information on the time when the abnormality occurs, it is possible to predict whether the cause of the abnormality is more likely to be an external factor or an internal factor.

[0028] Also, in the angle detection device with a time memory function according to Embodiment 1, the rotation detection unit 1 is configured to be supplied with power by switching from either the host computer 9 or the backup power supply unit 6. When the abnormality detection unit 2 detects an abnormality of the rotation detection unit 1 while the power is being supplied from the backup power supply unit 6 to the rotation detection unit 1, the time when the abnormality detection unit 2 detects the abnormality of the rotation detection unit 1 is stored in the memory unit 4. According to this configuration, when the power is not supplied from the host computer 9, the time when the abnormality detection unit 2 detects the abnormality of the rotation detection unit 1 is stored in the memory unit 4. Thereby, even when the power is not supplied from the host computer 9, the time when the abnormality detection unit 2 detects the abnormality of the rotation detection unit 1 can be obtained.

[0029] Also, in the angle detection device with a time memory function according to Embodiment 1, when the abnormality detection unit 2 detects an abnormality of the rotation detection unit 1 while the power is being supplied from the host computer 9 to the rotation detection unit 1, the time measured by the clock unit 3 at the time when the abnormality detection unit 2 detects the abnormality of the rotation detection unit 1 is not stored in the memory unit 4. According to this configuration, when the power is supplied from the host computer 9, the time when the abnormality detection unit 2 detects the abnormality of the rotation detection unit 1 is not stored in the memory unit 4. Thereby, the storage capacity of the memory unit 4 can be reduced.

[0030] In addition, in the angle detection device with a time memory function according to Embodiment 1, the clock unit 3 receives a standard radio wave and corrects the time to be measured using the received standard radio wave. According to this configuration, the accuracy of the time measured by the clock unit 3 can be improved.

[0031] In addition, the angle detection device with a time memory function according to Embodiment 1 includes a communication unit 7 that outputs the time stored in the memory unit 4 to the host computer 9. According to this configuration, by connecting the host computer 9 to the power supply switching unit 5, when the host computer 9 is not connected to the power supply switching unit 5, the time when the abnormality detection unit 2 detects an abnormality in the rotation detection unit 1 can be output to the host computer 9.

[0032] In addition, in the angle detection device with a time memory function according to Embodiment 1, when the abnormality detection unit 2 detects an abnormality in the rotation detection unit 1, the communication unit 7 outputs an abnormality occurrence signal indicating that an abnormality has occurred in the rotation detection unit 1 to the host computer 9. According to this configuration, by connecting the host computer 9 to the power supply switching unit 5, the abnormality signal occurrence signal can be output to the host computer 9.

[0033] In addition, in the angle detection device with a time memory function according to Embodiment 1, the abnormality detection unit 2 includes a shock measurement unit 201 and a shock abnormality determination unit 202. The shock measurement unit 201 measures the shock applied to the rotation detection unit 1. The shock abnormality determination unit 202 determines whether an abnormality has occurred in the rotation detection unit 1 based on the measurement result of the shock measurement unit 201. According to this configuration, when a shock is applied to the rotation detection unit 1, the abnormality detection unit 2 can detect an abnormality in the rotation detection unit 1.

[0034] In addition, in the angle detection device with a time memory function according to Embodiment 1, the rotation detection unit 1 is a rotation detection unit 1 that detects the rotation angle of the detection target axis. According to this configuration, the rotation angle of the detection target axis can be detected.

[0035] Embodiment 2. FIG. 3 is a block diagram showing the abnormality detection unit 2 of the angle detection device with a time memory function according to Embodiment 2. In the angle detection device with a time memory function according to Embodiment 2, the abnormality detection unit 2 includes a temperature and humidity measurement unit 203 and a temperature and humidity abnormality determination unit 204.

[0036] The temperature and humidity measurement unit 203 measures temperature or humidity. The measurement result of the temperature and humidity measurement unit 203 is input to the temperature and humidity abnormality determination unit 204.

[0037] A temperature and humidity abnormality determination threshold, which is a threshold used for determining an abnormality in temperature or humidity, is preset in the temperature and humidity abnormality determination unit 204. The temperature and humidity abnormality determination unit 204 compares the measurement result of the temperature and humidity measurement unit 203 with the temperature and humidity abnormality determination threshold to determine whether an abnormality has occurred in the rotation detection unit 1. In other words, the temperature and humidity abnormality determination unit 204 determines whether an abnormality has occurred in the rotation detection unit 1 based on the measurement result of the temperature and humidity measurement unit 203. The determination result of the temperature and humidity abnormality determination unit 204 is input to the control unit 8. In other words, the detection result of the abnormality detection unit 2 is input to the control unit 8.

[0038] Other configurations of the angle detection device with a time memory function according to Embodiment 2 are the same as those of the angle detection device with a time memory function according to Embodiment 1. Note that, similar to the angle detection device with a time memory function according to Embodiment 1, the abnormality detection unit 2 may further include a shock measurement unit 201 and a shock abnormality determination unit 202.

[0039] As described above, in the angle detection device with a time memory function according to Embodiment 2, the abnormality detection unit 2 includes a temperature and humidity measurement unit 203 and a temperature and humidity abnormality determination unit 204. The temperature and humidity measurement unit 203 measures the temperature or humidity of the rotation detection unit 1. The temperature and humidity abnormality determination unit 204 determines whether an abnormality has occurred in the rotation detection unit 1 based on the measurement result of the temperature and humidity measurement unit 203. According to this configuration, when the temperature or humidity of the rotation detection unit 1 abnormally rises, the abnormality detection unit 2 can detect the abnormality of the rotation detection unit 1.

[0040] In the angle detection device with a time storage function according to the first embodiment, the configuration in which the temperature and humidity measurement unit 203 measures temperature or humidity has been described. However, it is not limited to this. The temperature and humidity measurement unit 203 may be configured to measure both temperature and humidity.

[0041] Also, in each embodiment, the angle detection device with a time storage function has been described as an electrical device with a time storage function. However, it is not limited to this. An electrical device with a time storage function other than the angle detection device with a time storage function may also be used.

[0042] In the angle detection device with a time storage function according to each embodiment, the clock unit 3 receives a standard radio wave and corrects the time to be measured using the received standard radio wave. However, it is not limited to this. The clock unit 3 may be configured to receive time information from the host computer 9 and correct the time to be measured using the received time information. According to this configuration, the accuracy of the time measured by the clock unit 3 can be improved.

[0043] In the angle detection device with a time storage function according to each embodiment, when the abnormality detection unit 2 detects an abnormality in the rotation detection unit 1 while power is being supplied from the host computer 9 to the rotation detection unit 1, the time measured by the clock unit 3 when the abnormality detection unit 2 detects the abnormality in the rotation detection unit 1 is not stored in the storage unit 4. However, it is not limited to this. When the abnormality detection unit 2 detects an abnormality in the rotation detection unit 1 while power is being supplied from the host computer 9 to the rotation detection unit 1, the time measured by the clock unit 3 when the abnormality detection unit 2 detects the abnormality in the rotation detection unit 1 may be stored in the storage unit 4.

[0044] The angle detection device with a time storage function according to each of the preferred embodiments has been described above. However, the present invention is not limited to the angle detection device with a time storage function according to each of the above-described embodiments. Various modifications and conversions can be made to the angle detection device with a time storage function according to each of the above-described embodiments without departing from the scope described in the claims.

Description of Reference Numerals

[0045] 1 Rotation detection unit (abnormality detection target unit), 2 Abnormality detection unit, 3 Clock unit, 4 Memory unit, 5 Power supply switching unit, 6 Backup power supply unit, 7 Communication unit, 8 Control unit, 9 Host computer (external device), 201 Impact measurement unit, 202 Impact abnormality determination unit, 203 Temperature and humidity measurement unit, 204 Temperature and humidity abnormality determination unit.

Claims

1. An abnormality detection target portion (1); an abnormality detection unit (2) for detecting an abnormality in the abnormality detection target unit (1); A clock unit (3) that measures time; a memory unit (4) for storing, when the abnormality detection unit (2) detects the abnormality, the time measured by the clock unit (3) when the abnormality detection unit (2) detects the abnormality; An electrical device with a time memory function.

2. The abnormality detection target unit (1) is supplied with power from either an external device (9) or a backup power supply unit (6) by switching between them.

2. An electrical device with a time memory function as described in claim 1, wherein when the abnormality detection unit (2) detects the abnormality while power is being supplied from a backup power supply unit (6) to the abnormality detection target unit (1), the time is stored in the memory unit (4).

3. 3. An electrical device with a time memory function as described in claim 2, wherein when the abnormality detection unit (2) detects the abnormality while power is being supplied to the abnormality detection target unit (1) from an external device (9), the time is not stored in the memory unit (4).

4. 4. The electrical device with time storage function according to claim 1, wherein the clock unit (3) receives a standard radio wave and corrects the time to be measured using the received standard radio wave.

5. The electrical device with time memory function according to any one of claims 1 to 3, wherein the clock unit (3) receives time information from an external device (9) and corrects the time to be measured using the received time information.

6. An electrical device with a time memory function as described in any one of claims 1 to 3, further comprising a communication unit (7) that outputs the time stored in the memory unit (4) to an external device (9) when the abnormality detection unit (2) detects the abnormality.

7. The electrical device with time memory function as described in claim 6, wherein the communication unit (7) outputs an abnormality occurrence signal indicating that the abnormality has occurred in the abnormality detection target unit (1) to an external device (9) when the abnormality detection unit (2) detects the abnormality.

8. 4. The electrical device with time memory function according to claim 1, wherein the abnormality detection unit (2) has an impact measurement unit (201) that measures an impact acting on the abnormality detection target unit (1), and an impact anomaly judgment unit (202) that judges whether or not the abnormality has occurred in the abnormality detection target unit (1) based on a measurement result of the impact measurement unit (201).

9. The electrical device with time memory function described in any one of claims 1 to 3, wherein the abnormality detection unit (2) has a temperature and humidity measurement unit (203) that measures the temperature or humidity of the abnormality detection target unit (1), and a temperature and humidity anomaly determination unit (204) that determines whether or not the abnormality has occurred in the abnormality detection target unit (1) based on the measurement result of the temperature and humidity measurement unit (203).

10. 4. The electrical device with a time memory function according to claim 1, wherein the abnormality detection target portion (1) is a rotation detection portion (1) that detects a rotation angle of a detection target shaft.

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