JP6815884B2 - Battery level alarm device, numerical control device and machine tool system - Google Patents

Description

The present invention relates to a battery level alarm device, a numerical control device and a machine tool system.

Normally, an FA (factory automation) device includes a memory element such as an SRAM, and the memory element is supplied with power from a backup battery when the power of the FA device is off. Therefore, as the voltage of the battery decreases, the voltage supplied to the memory element also decreases, and when the voltage of the battery drops below the data holding voltage of the memory element, the contents of the memory element are erased.

Conventionally, in order to avoid such inconvenience, an FA device having a non-volatile memory may be provided with a battery alarm detection circuit that detects when the voltage of the battery for memory backup drops and generates an alarm. (See, for example, Patent Document 1).

In general, the main methods for estimating the battery voltage (remaining amount) are (1) the method of integrating the product of the current value and the charge / discharge time to estimate the consumed capacity, and (2) the time between terminals. It is roughly divided into a method of plotting in a series and estimating the capacity from the slope of the plotted graph.

Japanese Unexamined Patent Publication No. 7-120508

However, with respect to the numerical control device of a machine tool, it is difficult to estimate the battery voltage by the above-mentioned method because a backup current flows when the numerical control device is turned off. Therefore, it is not possible to properly predict the battery life and generate an alarm.

In view of such circumstances, the present invention provides a battery level alarm device, a numerical control device, and a machine tool system capable of appropriately predicting the life of a backup battery of a memory element and generating an alarm. The purpose is to provide.

The remaining battery level alarm device (for example, the remaining battery level alarm device 4 described later) according to the present invention has a life of a battery (for example, a battery 6 described later) for backing up a memory element (for example, the memory element 5 described later). A battery level alarm device that predicts and generates an alarm, and is a first operating environment temperature (for example, the first operating environment temperature T1 described later) and a second operating environment temperature (for example, the first described later) that are different from each other. The voltage measuring means (for example, the voltage measuring unit 43 described later) for measuring the voltage between the terminals of the battery (for example, the voltage V1 and V2 described later) at the operating environment temperature T2) of 2) and the two operating environments different from each other. The rate of change obtained by dividing the voltage difference between the terminals of the battery at temperature (for example, the voltage difference ΔV described later) by the temperature difference of these operating environment temperatures (for example, the temperature difference ΔT described later), and the balance of the battery. A threshold setting means (for example, a threshold setting unit 44 described later) for setting a change rate corresponding to a small amount as a change rate threshold (for example, a change rate threshold RT described later) and the first operating environment temperature described above. The voltage between terminals of the battery measured by the voltage measuring means (for example, the voltage between terminals V1 described later) and the voltage between terminals of the battery measured by the voltage measuring means at the second operating environment temperature (for example, the terminals described later). The rate of change (for example, the rate of change R described later) obtained by dividing the voltage difference from the inter-voltage V2) by the temperature difference between the first operating environment temperature and the second operating environment temperature is set by the threshold setting means. When the determination means for determining whether or not the change rate threshold is exceeded (for example, the determination unit 45 described later) and the determination means for determining that the change rate exceeds the change rate threshold, the said It is provided with an alarm generating means (for example, an alarm generating unit 46 described later) that generates an alarm indicating that the remaining battery level is low.

The threshold value setting means may set the rate of change threshold value based on the temperature characteristics of the battery.

The threshold value setting means may set the rate of change threshold value by machine learning.

The threshold value setting means sets the change rate threshold value in a plurality of stages, and the alarm generation means sets the urgency of an alarm indicating that the remaining battery level is low according to the magnitude of each stage of the change rate threshold value. You may change it.

Further, the battery remaining amount alarm device (for example, the battery remaining amount alarm device 4 described later) according to the present invention is a battery (for example, the battery 6 described later) for backing up a memory element (for example, the memory element 5 described later). A battery level alarm device that predicts the life and generates an alarm, and is a first operating environment temperature (for example, the first operating environment temperature T1 described later) and a second operating environment temperature (for example, described later) that are different from each other. The voltage measuring means (for example, the voltage measuring unit 43 described later) for measuring the terminal voltage (for example, the terminal voltage V1 and V2 described later) of the battery at the second operating environment temperature T2) and two different from each other. The voltage difference between the terminals of the battery at the operating environment temperature (for example, the voltage difference ΔV described later) and the corresponding voltage difference when the remaining amount of the battery is low is the voltage threshold (for example, the voltage threshold VT described later). (For example, the threshold setting unit 44 described later) and the inter-terminal voltage of the battery measured by the voltage measuring means at the first operating environment temperature (for example, the inter-terminal voltage V1 described later). The voltage difference (for example, the voltage difference ΔV described later) from the terminal voltage of the battery measured by the voltage measuring means at the second operating environment temperature (for example, the terminal voltage V2 described later) is the threshold setting. When it is determined by the determination means (for example, the determination unit 45 described later) that determines whether or not the voltage threshold is exceeded by the means, and the determination means that the voltage difference exceeds the voltage threshold. An alarm generating means (for example, an alarm generating unit 46 described later) for generating an alarm indicating that the remaining battery level is low is provided.

The threshold value setting means may set the voltage threshold value based on the temperature characteristic of the battery.

The threshold value setting means may set the voltage threshold value by machine learning.

The threshold value setting means sets the voltage threshold value in a plurality of stages, and the alarm generation means changes the urgency of an alarm indicating that the remaining battery level is low according to the magnitude of each stage of the voltage threshold value. You may.

A temperature measuring means (for example, a temperature measuring unit 42 described later) for measuring the operating environment temperature of the battery may be provided.

The battery may have a temperature dependence in which the voltage between terminals fluctuates depending on the operating environment temperature.

The battery may be a lithium manganese dioxide primary battery.

The numerical control device according to the present invention (for example, the numerical control device 3 described later) has the battery level alarm device.

The machine tool system according to the present invention (for example, the machine tool system 1 described later) is configured so that the machine tool is controlled by the numerical control device.

One of the first operating environment temperature and the second operating environment temperature is the temperature when the power of the numerical control device is turned on, and the other is the temperature when the power of the numerical control device is turned off. May be good.

The voltage measuring means supplies power to the memory element from the numerical control device while power is being supplied from the battery to the memory element when the power of the numerical control device is turned on or off. May be configured to measure the voltage between the terminals of the battery.

According to the present invention, it is possible to provide a battery level alarm device capable of appropriately predicting the life of a backup battery of a memory element and generating an alarm.

It is a block diagram which shows the whole machine tool system which concerns on 1st Embodiment of this invention. It is a block diagram which shows the battery level alarm device which concerns on 1st Embodiment of this invention. It is a graph which shows the temperature characteristic at the time of 40mA continuous discharge of a lithium manganese dioxide primary battery. It is a graph which shows that the contact width of the voltage between terminals becomes large as the life of a battery approaches. It is a flowchart which shows the process of the battery level alarm device which concerns on 1st Embodiment of this invention. It is a block diagram which shows the whole machine tool system which concerns on 2nd Embodiment of this invention.

Hereinafter, the first embodiment of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a block diagram showing the entire machine tool system according to the first embodiment of the present invention. FIG. 2 is a block diagram showing a battery level alarm device according to the first embodiment of the present invention. FIG. 3 is a graph showing the temperature characteristics of a lithium manganese dioxide primary battery during continuous discharge of 40 mA. FIG. 4 is a graph showing that the contact width of the voltage increases as the battery life approaches. FIG. 5 is a flowchart showing the processing of the battery level alarm device according to the first embodiment of the present invention.

<Configuration of machine tool system 1>
As shown in FIG. 1, the machine tool system 1 according to the first embodiment includes a machine tool 2 such as a machining center and a numerical control device 3. Here, the machine tool 2 is connected to the numerical control device 3 by wire or wireless data communication so as to be controlled by the numerical control device 3. Further, the numerical control device 3 incorporates a memory element 5 such as an SRAM for storing various numerical control data necessary for the operation of the machine tool 2, and manganese dioxide for backup of the memory element 5. A lithium primary battery is mounted as the battery 6.

Further, as shown in FIG. 1, the numerical control device 3 has a built-in battery level alarm device 4. The battery level alarm device 4 has an appropriate life of the battery 6 by paying attention to the fact that the backup battery 6 of the memory element 5 has a temperature dependence in which the voltage V between terminals fluctuates depending on the operating environment temperature T. It is intended to generate an alarm in anticipation of the above, and has a main control unit 41 as shown in FIG. The main control unit 41 includes a temperature measuring unit 42 as a temperature measuring means, a voltage measuring unit 43 as a voltage measuring means, a threshold setting unit 44 as a threshold setting means, a determination unit 45 as a determination means, and an alarm generating means. The alarm generation unit 46 is connected.

The main control unit 41 has the temperature measurement unit 42, the voltage measurement unit 43, the threshold value setting unit 44, the determination unit 45, and the alarm generation unit 46 as a whole so as to appropriately predict the life of the battery 6 and generate an alarm. Control.

Based on a command from the main control unit 41, the temperature measuring unit 42 measures the operating environment temperature T of the battery 6 as the first operating environment temperature T1 when the numerical control device 3 is turned on by a temperature sensor (not shown). When the power of the numerical control device 3 is turned off, the operating environment temperature T of the battery 6 is measured as the second operating environment temperature T2.

Based on the command from the main control unit 41, the voltage measuring unit 43 measures the voltage V1 between the terminals of the battery 6 at the first operating environment temperature T1 when the numerical control device 3 is turned on by a voltmeter (not shown). When the power of the numerical control device 3 is turned off, the voltage V2 between the terminals of the battery 6 at the second operating environment temperature T2 is measured.

Based on the command from the main control unit 41, the threshold setting unit 44 sets the voltage difference ΔV of the voltage V between the terminals of the battery 6 at two different operating environment temperatures T based on the temperature characteristics of the battery 6 in these operating environments. The rate of change R (= ΔV / ΔT) divided by the temperature difference ΔT of the temperature T when the remaining amount of the battery 6 is low is set as the rate of change threshold RT.

For example, when a lithium manganese dioxide primary battery is continuously discharged at 40 mA, as shown in FIG. 3, a plurality of (specifically, −20 ° C., −10 ° C., 0 ° C., 20 ° C., 60 ° C.) operating environment temperatures T In each case, the voltage V between the terminals of the battery 6 decreases as the discharge capacity increases. Here, paying attention to the voltage difference ΔV (three arrows in FIG. 3) of the voltage V between the terminals of the battery 6 between the case where the operating environment temperature T is 20 ° C. and the case where the operating environment temperature T is 60 ° C., the battery 6 The voltage difference ΔV tends to increase as the discharge capacity increases (that is, as the remaining amount of the battery 6 decreases). That is, in the normal state of the battery 6 (when the remaining amount of the battery 6 is not low), the operating environment temperature T (horizontal axis of the graph of FIG. 4) changes by a constant temperature as shown by a single point chain line in FIG. The change in the voltage V between the terminals of the battery 6 (vertical axis in the graph of FIG. 4) is relatively small, whereas when the battery 6 is near the end of its life (when the remaining battery 6 is low), the change is relatively small. As shown by the solid line in FIG. 4, the change in the voltage V between the terminals of the battery 6 when the operating environment temperature T changes by a certain temperature is relatively large. Therefore, in order to quantify this difference numerically, a rate of change R (= ΔV / ΔT) obtained by dividing the voltage difference ΔV by the temperature difference ΔT is introduced, and the rate of change is used as a reference for determining the magnitude of the remaining amount of the battery 6. The threshold RT is adopted.

The determination unit 45 calculates the temperature difference ΔT between the first and second operating environment temperatures T1 and T2 based on the command from the main control unit 41, and also calculates the temperature difference ΔT between the first and second operating environment temperatures T1. , T2, the voltage difference ΔV between the terminals of the battery 6 is calculated from the voltage V1 and V2, and the voltage difference ΔV is divided by the temperature difference ΔT to calculate the rate of change R (= ΔV / ΔT). It is determined whether or not R exceeds the rate of change threshold RT set by the threshold setting unit 44.

When the determination unit 45 determines that the rate of change R exceeds the predetermined rate of change threshold RT, the alarm generation unit 46 generates an alarm indicating that the remaining amount of the battery 6 is low. For this alarm, various methods such as lighting a lamp and displaying a message can be adopted.

<Processing flow of battery level alarm device 4>
Next, the processing flow of the battery level alarm device 4 will be described with reference to FIG. FIG. 5 is a flowchart showing the processing of the battery level alarm device 4. Prior to this process, the threshold value setting unit 44 sets a predetermined rate of change threshold value RT in advance. Further, this process is executed based on a command from the main control unit 41.

First, in step S1, when the operator presses the power-on button (not shown) of the numerical control device 3, the temperature measuring unit 42 measures the first operating environment temperature T1, and the voltage measuring unit 43 measures the first operating environment temperature T1. , The voltage V1 between terminals of the battery 6 at the first operating environment temperature T1 is measured.

At this time, the numerical control device 3 does not execute the power-off operation of the battery 6 immediately after the power-on button is pressed, but a predetermined first delay time (for example, 1 to 1) after the power-on button is pressed. When only 5 seconds have passed, the power-off operation of the battery 6 is executed, and the power-on operation of the numerical control device 3 is executed immediately after the power-on button is pressed. By doing so, during this first delay time, not only the numerical control device 3 but also the battery 6 is turned on, so that the numerical control device is in a state where power is supplied from the battery 6 to the memory element 5. By supplying power from No. 3, the voltage V1 between the terminals of the battery 6 at the first operating environment temperature T1 can be measured. As a result, the voltage measuring unit 43 can accurately detect the voltage V1 between the terminals of the battery 6 at the first operating environment temperature T1 when the power of the numerical control device 3 is turned on.

Next, in step S2, when the operator presses the power off button (not shown) of the numerical control device 3, the temperature measuring unit 42 measures the second operating environment temperature T2, and the voltage measuring unit 43 measures the second operating environment temperature T2. , The voltage V2 between terminals of the battery 6 at the second operating environment temperature T2 is measured.

At this time, the numerical control device 3 does not execute the power-off operation of the numerical control device 3 immediately after the power-off button is pressed, but a predetermined second delay time (for example, for example) after the power-off button is pressed. The power-off operation of the numerical control device 3 is executed when only 1 to 5 seconds have elapsed, and the power-on operation of the numerical control device 3 is continued for a time equal to this second delay time. By doing so, during this second delay time, not only the battery 6 but also the numerical control device 3 is turned on, so that the numerical control device is in a state where power is being supplied from the battery 6 to the memory element 5. By supplying power from 3, the voltage V2 between the terminals of the battery 6 at the second operating environment temperature T2 can be measured. As a result, the voltage measuring unit 43 can accurately detect the voltage V2 between the terminals of the battery 6 at the second operating environment temperature T2 when the power of the numerical control device 3 is turned off.

In step S3, the determination unit 45 sets the temperature difference ΔT between the first and second operating environment temperatures T1 and T2 during the second delay time described above (that is, when the numerical control device 3 is turned on). In addition to the calculation, the voltage difference ΔV between the terminals of the batteries 6 at the first and second operating environment temperatures T1 and T2 is calculated from the voltages V1 and V2, and the voltage difference ΔV is divided by the temperature difference ΔT to change. After calculating the rate R (= ΔV / ΔT), it is determined whether or not the rate of change R exceeds the rate of change threshold RT set by the threshold setting unit 44.

As a result, when it is determined that the rate of change R does not exceed the predetermined rate of change threshold RT (R ≦ RT), it is considered that the remaining amount of the battery 6 is not low yet, so that the remaining battery level is The processing flow of the amount alarm device 4 is terminated, and when the above-mentioned second delay time elapses, the power off operation of the numerical control device 3 is executed.

On the other hand, when it is determined that the rate of change R exceeds the predetermined rate of change threshold RT (R> RT), in step S4, the alarm generating unit 46 gives an alarm indicating that the remaining amount of the battery 6 is low. To generate. Further, in step S5, the main control unit 41 suspends the power-off operation of the numerical control device 3 even after the above-mentioned second delay time has elapsed. As a result, the power supply from the numerical control device 3 to the memory element 5 is continued, so that the inconvenience that the remaining amount of the battery 6 drops below the data holding voltage of the memory element 5 and the contents of the memory element 5 are erased is avoided. can do. At this point, the processing flow of the battery level alarm device 4 is terminated.

As described above, the battery remaining amount alarm device 4 sets the voltage difference ΔV between the terminals of the batteries 6 at different operating environment temperatures T1 and T2 in the backup battery 6 of the memory element 5 by the temperature difference ΔT. The remaining amount of the battery 6 is estimated based on the divided rate of change R. Therefore, it is possible to appropriately predict the life of the backup battery 6 of the memory element 5 and generate an alarm.

Moreover, since this rate of change R is a value obtained by dividing the voltage difference ΔV by the temperature difference ΔT, the operating environment temperatures T1 and T2 fluctuate due to external factors such as the season (outside air temperature), and the temperature difference ΔT thereof becomes. Even if the temperature is increased or decreased, it is possible to appropriately predict the life of the backup battery 6 of the memory element 5 and generate an alarm.

[Second Embodiment]
FIG. 6 is a block diagram showing the entire machine tool system according to the second embodiment of the present invention.

The machine learning system 1 according to the second embodiment has slightly different temperature characteristics for each battery 6 even if it is the same lithium manganese dioxide primary battery, and does not necessarily show the temperature characteristics at the time of continuous discharge of 40 mA (see FIG. 3). Considering that this is not always the case, the point that the temperature characteristic of the battery 6 is learned by the clustering of machine learning (unsupervised learning) and the change rate threshold RT is set while executing the processing flow of the battery remaining amount alarm device 4. Except for this, it has the same configuration as the first embodiment described above.

That is, in the machine tool system 1 according to the second embodiment, as shown in FIG. 6, in addition to the configuration of the first embodiment described above, the machine learning device 7 is wired, wireless, or connected to the numerical control device 3. It is directly connected to enable data communication via. The machine learning device 7 includes an analysis unit 71 and a threshold value calculation unit 72. Each time the analysis unit 71 of the machine learning device 7 executes the processing flow (see FIG. 5) of the battery level alarm device 4 described in the first embodiment described above for a predetermined period (for example, one year). The rate of change R obtained by dividing the voltage difference ΔV of the battery 6 by the temperature difference ΔT is acquired from the numerical control device 3 as input data and stored. If this storage period is long, the large number of input data will be a mixture of the normal data of the battery 6 (when the remaining amount is sufficient) and the data when the remaining amount of the battery 6 is low. Conceivable. Therefore, the analysis unit 71 of the machine learning device 7 uses hierarchical clustering and other clustering to convert a large number of these input data into two clusters, that is, the data when the battery 6 is normal and the data when the battery 6 is low. To divide. Then, the threshold calculation unit 72 of the machine learning device 7 calculates a representative value (for example, an average value, a median value, etc.) from a plurality of data (change rate R of the battery 6) when the remaining amount of the battery 6 is low. Then, this is sent to the numerical control device 3 as output data. In response to this, in the battery remaining amount alarm device 4, the threshold value setting unit 44 sets the change rate threshold RT based on the output data, and then the main control unit 41 uses the change rate threshold RT to describe the above. It is controlled to execute the same processing flow as that of the first embodiment.

As described above, in the machine tool system 1 according to the second embodiment, when the threshold value setting unit 44 sets the change rate threshold value RT, the clustering of machine learning is used, so that the machine tool system 1 is the same as the first embodiment described above. In addition to exhibiting the same effects, even if the battery 6 has different temperature characteristics for each manufacturer, or even if the batteries 6 made by the same manufacturer have individual differences, the voltage drop of the battery 6 is properly detected. The alarm can be generated in a timely manner.

The rate of change threshold RT thus set by machine learning clustering can be a shared asset that can be used not only by this numerical control device 3 but also by other numerical control devices (not shown).

[Other Embodiments]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. Further, the effects described in the present embodiment merely list the most preferable effects arising from the present invention, and the effects according to the present invention are not limited to those described in the present embodiment.

[Modification 1]
In the first embodiment and the second embodiment described above, the threshold value setting unit 44 sets a predetermined rate of change threshold value RT, and the determination unit 45 sets the voltage difference ΔV in the battery 6 for backup of the memory element 5 by temperature. It is determined whether or not the rate of change R divided by the difference ΔT exceeds the predetermined rate of change threshold RT, and when it is determined that the rate of change R exceeds the predetermined rate of change threshold RT, the alarm generation unit The 46 generated an alarm indicating that the remaining amount of the battery 6 was low, and the main control unit 41 suspended the power-off operation of the numerical control device 3.

However, when it can be considered that there is no substantial fluctuation in the first operating environment temperature T1 and the second operating environment temperature T2, the voltage measuring unit 43 performs the voltage measuring unit 43 at the first operating environment temperature T1 instead of the rate of change R. The voltage difference ΔV (= V1-V2) between the measured voltage V1 between the terminals of the battery 6 and the voltage V2 between the terminals of the battery 6 measured by the voltage measuring unit 43 at the second operating environment temperature T2 is used, and the rate of change is used. A predetermined voltage threshold VT can be used instead of the threshold RT. That is, the threshold setting unit 44 sets the voltage difference ΔV corresponding to the voltage difference ΔV of the voltage V between the terminals of the battery 6 at two different operating environment temperatures T and the remaining amount of the battery 6 as the voltage threshold VT. At the same time, the determination unit 45 sets the voltage V1 between the terminals of the battery 6 measured by the voltage measuring unit 43 at the first operating environment temperature T1 and the battery 6 measured by the voltage measuring unit 43 at the second operating environment temperature T2. The voltage difference ΔV (= V1-V2) with the terminal voltage V2 is calculated, and it is determined whether or not this voltage difference ΔV exceeds the voltage threshold VT set by the threshold setting unit 44, and this voltage difference is determined. When ΔV exceeds a predetermined voltage threshold VT, the alarm generating unit 46 generates an alarm indicating that the remaining amount of the battery 6 is low, and the main control unit 41 suspends the power-off operation of the numerical control device 3. You may.

[Modification 2]
In the first embodiment and the second embodiment described above, the case where the backup battery 6 of the memory element 5 is a manganese dioxide lithium primary battery in the numerical control device 3 has been described. However, as with the lithium manganese dioxide primary battery, if the battery has a temperature dependence in which the voltage V between terminals fluctuates depending on the operating environment temperature T, this battery is mounted as the backup battery 6 of the memory element 5. The present invention can be similarly applied to the control device 3.

[Modification 3]
In the first embodiment and the second embodiment described above, the case where the threshold value setting unit 44 sets only one change rate threshold value RT in the battery level alarm device 4 has been described. However, the threshold value setting unit 44 sets the change rate threshold RT in a plurality of stages, and the alarm generation unit 46 determines the urgency of the alarm that the remaining amount of the battery 6 is low according to the magnitude of each stage of the change rate threshold RT. May be changed.

Further, in the above-described modification 1, the case where the threshold value setting unit 44 sets only one voltage threshold value VT in the battery remaining amount alarm device 4 has been described. However, the threshold setting unit 44 sets the voltage threshold VT in a plurality of stages, and the alarm generation unit 46 changes the urgency of the alarm indicating that the remaining amount of the battery 6 is low according to the magnitude of each stage of the voltage threshold VT. You may try to do it.

In these cases, the operator can take appropriate measures in response to the urgency of the alarm, which can be useful for work such as process management, maintenance, and inspection of the machine tool system 1.

[Modification example 4]
In the first embodiment and the second embodiment described above, the case where the battery level alarm device 4 is built in the numerical control device 3 has been described. However, the battery level alarm device 4 does not necessarily have to be built in the numerical control device 3, and for example, it is installed outside the numerical control device 3 and connected to the numerical control device 3 via a wired, wireless or connection unit so that data communication can be performed directly. It doesn't matter.

[Modification 5]
In the first and second embodiments described above, the first operating environment temperature T1 is set to the temperature at which the numerical control device 3 is turned on, and the second operating environment temperature T2 is set to the power off of the numerical control device 3. The case of setting the temperature to the hour has been described. However, conversely, the first operating environment temperature T1 may be set to the temperature when the power of the numerical control device 3 is turned off, and the second operating environment temperature T2 may be set to the temperature when the numerical control device 3 is turned on.

[Modification 6]
In the second embodiment described above, the case where the machine learning device 7 is installed outside the numerical control device 3 has been described, but the machine learning device 7 may be built in the numerical control device 3.

[Modification 7]
In the second embodiment described above, the case where the rate of change threshold RT is set by clustering of machine learning has been described, but a machine learning method other than clustering (for example, principal component analysis, vector quantization, self-organization map, etc.) May be used.

1 …… Machine tool system 2 …… Machine tool 3 …… Numerical control device 4 …… Battery level alarm device 5 …… Memory element 6 …… Battery 41 …… Main control unit 42 …… Temperature measuring unit (temperature measuring means) )
43 …… Voltage measuring unit (voltage measuring means)
44 …… Threshold setting unit (threshold setting means)
45 …… Judgment unit (judgment means)
46 …… Alarm generator (alarm generator)
R …… Change rate RT …… Change rate threshold T …… Operating environment temperature T1 …… First operating environment temperature T2 …… Second operating environment temperature V1, V2 …… Terminal voltage VT …… Voltage threshold ΔT… … Temperature difference ΔV …… Voltage difference

Claims (15)

It is a battery level alarm device that predicts the life of the battery for backing up the memory element and generates an alarm.
A voltage measuring means for measuring the voltage between the terminals of the battery at a first operating environment temperature and a second operating environment temperature that are different from each other,
The rate of change obtained by dividing the voltage difference between the terminals of the battery at two different operating environment temperatures by the temperature difference of these operating environment temperatures, and the rate of change corresponding to when the remaining battery level is low. Threshold setting means to set as a threshold and
The voltage difference between the terminal voltage of the battery measured by the voltage measuring means at the first operating environment temperature and the terminal voltage of the battery measured by the voltage measuring means at the second operating environment temperature is the first. A determination means for determining whether or not the rate of change divided by the temperature difference between the operating environment temperature 1 and the second operating environment temperature exceeds the rate of change threshold set by the threshold setting means.
When the determination means determines that the rate of change exceeds the rate of change threshold, the alarm generating means for generating an alarm indicating that the remaining battery level is low, and the alarm generating means.
The battery level alarm device is equipped with. The battery level alarm device according to claim 1, wherein the threshold value setting means sets the rate of change threshold value based on the temperature characteristics of the battery. The battery level alarm device according to claim 1, wherein the threshold value setting means sets the rate of change threshold value by machine learning. The threshold value setting means sets the change rate threshold value in a plurality of stages, and the alarm generation means sets the urgency of an alarm indicating that the remaining battery level is low according to the magnitude of each stage of the change rate threshold value. The battery level alarm device according to any one of claims 1 to 3, which is to be changed. It is a battery level alarm device that predicts the life of the battery for backing up the memory element and generates an alarm.
A voltage measuring means for measuring the voltage between the terminals of the battery at a first operating environment temperature and a second operating environment temperature that are different from each other,
A threshold setting means for setting a voltage difference between the terminals of the battery at two different operating environment temperatures as a voltage threshold when the remaining amount of the battery is low.
The voltage difference between the terminal voltage of the battery measured by the voltage measuring means at the first operating environment temperature and the terminal voltage of the battery measured by the voltage measuring means at the second operating environment temperature is. A determining means for determining whether or not the voltage threshold set by the threshold setting means is exceeded, and
When the determination means determines that the voltage difference exceeds the voltage threshold value, the alarm generation means for generating an alarm indicating that the remaining battery level is low, and the alarm generation means.
The battery level alarm device is equipped with. The battery level alarm device according to claim 5, wherein the threshold value setting means sets the voltage threshold value based on the temperature characteristic of the battery. The battery level alarm device according to claim 5, wherein the threshold value setting means sets the voltage threshold value by machine learning. The threshold value setting means sets the voltage threshold value in a plurality of stages, and the alarm generation means changes the urgency of an alarm indicating that the remaining battery level is low according to the magnitude of each stage of the voltage threshold value. The battery level alarm device according to any one of claims 5 to 7. The battery level alarm device according to any one of claims 1 to 8, further comprising a temperature measuring means for measuring the operating environment temperature of the battery. The battery level alarm device according to any one of claims 1 to 9, wherein the battery has a temperature dependence in which the voltage between terminals fluctuates depending on the operating environment temperature. The battery level alarm device according to any one of claims 1 to 10, wherein the battery is a lithium manganese dioxide primary battery. A numerical control device having the battery level alarm device according to any one of claims 1 to 11. A machine tool system configured such that the machine tool is controlled by the numerical control device according to claim 12. The first operating environment temperature and the second operating environment temperature are claims that one of them is the temperature when the power of the numerical control device is turned on and the other is the temperature when the power of the numerical control device is turned off. Item 13. The machine tool system according to item 13. The voltage measuring means supplies power to the memory element from the numerical control device while power is being supplied from the battery to the memory element when the power of the numerical control device is turned on or off. The machine tool system according to claim 14, which is configured to measure the voltage between terminals of the battery.

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