JP2006049411A - Method and device for monitoring joining section of power element by estimating temperature rise of the section - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for monitoring the joining section of a power element by estimating the temperature of the joining section by means of software for preventing the breakage of the power element by heat. <P>SOLUTION: The method includes steps of: (ST1) setting the parameter information regarding the temperature rise of the joining section of the power element including the allowable temperature of the joining section; (ST2) calculating the variation of the temperature of the case of a power element unit by considering the thermal time constant of the case; and (ST3) of calculating the temperature of the case by accumulating the variation of the temperature of the case. The method also includes steps of: (ST5 and ST6 or ST7 and ST8) calculating the temperature rise of the joining section of the power element based on the electric current flowing to the joining section; (ST9 and ST10) calculating the temperature of the joining section of the power element by adding the calculated temperature rise to the calculated temperature of the case, and (ST11) of judging whether the calculated temperature of the joining section falls within a set allowable temperature range and generating an alarm signal when the temperature does not fall within the temperature range. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a power element protection method and apparatus, and more particularly, to a method and apparatus for estimating and monitoring a power element junction temperature by software in order to prevent thermal damage.

Conventionally, power elements have been used for high power switching. For example, as shown in FIG. 7, a pulse width modulation (PWM) type inverter unit 12 constituting a circuit for supplying three-phase AC power to the servo motor 3 includes an insulated gate bipolar transistor 801 ( An IGBT (Insulated Gate Bipolar Transistor) and a freewheeling diode 802 (FWD) are used.
The servo motor 3 is used in a drive mechanism such as a machine tool, an electric injection molding machine, or a die casting machine because it can accurately control the position and speed of a driven body coupled thereto. In these machines, high-speed and high-torque orientations are strongly demanded, and at the same time cost reduction is required. Therefore, in the power element forming the servo amplifier including the inverter unit, it is possible to flow current up to its allowable limit value. Often there is. The reason for this is that, in general, when creating a series of operation command groups for the control object for driving the control object to perform desired processing, molding, display, etc., the creator There is a situation in which the operation command group is created without considering how much drive current is supplied to the power element unit in the process of execution.

For example, in the electric injection molding machine, the speed of the injection screw rotation on the injection device side, the rapid change in the injection speed of the injection screw, and the increase of the clamping force on the clamping device side shorten the injection molding cycle. In order to satisfy these operations, the power supplied to the servo motors provided in each drive unit also increases. As a result, the temperature rise at the junction of the power element suddenly increases due to the current flowing in the power element constituting the servo amplifier for supplying power to the servo motor, and if the allowable limit value is exceeded, the heat of the power element May cause damage. For this reason, in the prior art, the temperature management of the power element of the servo amplifier is performed by a hardware method (see, for example, Patent Document 1).

  FIG. 8 is a diagram illustrating the state of the temperature management as a general structure. That is, in FIG. 8, comb-shaped heat radiation fins 95 are formed at the bottom of a heat radiating plate 94 (hereinafter referred to as a heat sink), and a temperature-controlled cooling medium such as an air conditioner is formed in the space between the fins 95. The heat sink 94 is kept within a predetermined temperature range. A power element unit 9 is disposed on the upper surface of the heat sink 94. In the power element unit 9, an insulating plate 92 made of an insulating material such as ceramic is disposed on a copper plate 93 in contact with the upper surface of the heat sink 94. Reference numerals 96 and 97 are semiconductor chips each having one or more power elements, and constitute a heating element. A case temperature sensor (TS1) 98A is disposed adjacent to the semiconductor chip 96. On the other hand, as shown in the figure, a temperature sensor (TS2) 98B for directly detecting the junction temperature of the power element is formed on the semiconductor chip 97.

This type of semiconductor chip 97 is called an IPM (Intelligence Power Module), and is more expensive than the semiconductor chip 96 corresponding to the above-described insulated gate bipolar transistor (IGBT). The manufacturing itself is complicated. Reference numeral 99 is a case temperature overheat detection switch (TSW) disposed on the heat sink 94. Reference numeral 91 denotes a plastic sealing lid, which blocks the chips 96 and 97 and the nearby circuit wiring portion from the outside to prevent entry of dust and the like. Usually, the upper surface of the insulating plate 92 and each chip are covered with a gel-like substance having relatively good heat conductivity, and the heat generated in the semiconductor chip is diffused to the entire insulating plate 92 through the gel-like substance. Therefore, the generated heat does not stay in the inner space of the lid 91 as it is even in the sealed state as described above.
In terms of the thermal time constant TC related to heat transfer, when the heat generating parts are the semiconductor chips 96 and 97, the position of the case temperature overheat detection switch 99 and the temperature sensor 98A disposed on the upper surface of the heat sink 94 It takes several minutes, and the temperature sensor 98B is on the order of several tens of msec. That is,
TC (TS2) << TC (TS1) << = TC (TSW)
It is.
Further, the temperature gradient (thermal resistance) HR is as follows.
HR (heat generating part to TS2) <<< HR (heat generating part to TS1) << HR (heat generating part to TSW)
As illustrated in FIG. 8, in the conventional power element unit, it is difficult to directly measure the junction temperature inside the transistor in the semiconductor chip 96, that is, the IGBT. For this reason, when the current flowing through the power element suddenly increases, the thermal time constant of the case portion formed of the gel material and the insulating plate 92 is large in the external temperature sensor 98A, that is, the temperature change is slow. Therefore, rapid heating of the internal junction of the transistor constituting the IGBT cannot be detected, and there is a risk of heating damage.
Further, as described above, the semiconductor chip 97, that is, the IPM, can directly measure the junction temperature of the power element inside the IPM. Therefore, there is no problem of the thermal time constant as in the case of the IGBT, but it is expensive. There is a difficulty that lacks versatility.
JP 2000-324893 A

  As a result of intensive studies and efforts to solve the above-mentioned problems, the present inventors have increased the temperature of the case part due to the generated heat (in the case of IGBT) or the temperature increase of the joint due to the generated heat (in the case of IPM) Instead of the conventional hardware response of detecting by each temperature sensor, a software response is performed in which the junction temperature of the power element is instantaneously calculated based on the current flowing through the power element and estimated in real time. It has been found that the above problems can be solved. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method and apparatus for estimating and monitoring a power element junction temperature by software in order to prevent the power element from being damaged by heat.

In order to achieve the above object, a method for estimating and monitoring the junction temperature of the power device according to the present invention includes:
For the control object, comprising: a power element unit; a control object that is electrically connected and coupled to the power element unit and supplied with driving power; and a controller that stores a time-series command group for instructing driving of the control object. A method of estimating and monitoring a temperature rise of a joint portion of a power element that constitutes the power element unit of the drive device,
A first step of setting parameter information relating to a temperature rise of a junction including a junction allowable temperature of the power element;
A second stage of calculating a change in case temperature of the power element unit in consideration of a thermal time constant of the case during driving of the control target;
A third stage of calculating the case temperature by accumulating the change in the case temperature during the driving of the controlled object;
A fourth stage of calculating a temperature rise of the junction of the power element based on a current flowing through the junction during driving of the control target;
A fifth stage of calculating the junction temperature of the power element by adding the temperature increase calculated in the fourth stage to the case temperature calculated in the third stage during driving of the control target; ,
Comprising a sixth stage for comparing the allowable temperature of the power element junction set in the first stage and the junction temperature of the power element calculated in the fifth stage and determining the magnitude thereof. It is characterized by.
In this case, the change in the case temperature in the second stage applies a first-order low-pass filter to the product of the case temperature increase coefficient which is one of the parameter information and the current command value generated in the controller. It is preferable to produce it.
Further, the temperature rise of the junction in the fourth stage is the temperature rise due to the iron loss calculated based on the frequency of the same current as the temperature increase due to the copper loss calculated based on the current flowing through the junction. Can be generated as a sum of minutes.
Further, different parameter information related to the drive speed of the control target can be used for the calculation of the temperature rise of the joint in the fourth stage.
Furthermore, as a result of the determination in the sixth step, the sixth step further includes a step of generating a warning signal when the junction temperature of the power element exceeds the set allowable junction temperature. It can be configured as follows.
In this case, as a result of the determination in the sixth step, when the junction temperature of the power element exceeds the set junction allowable temperature, the step of reducing the drive speed of the control target is the sixth step. These steps can be configured to further include.
In this case, the object to be controlled is a servo motor, the power element unit is an AC servo driver, and the controller can be constituted by a computerized numerical control device.

In order to achieve the above object, an apparatus for estimating and monitoring the junction temperature of the power element according to the present invention is as follows.
Control device drive device comprising: a power element unit; a control object electrically connected to and coupled to the power element unit and supplied with driving power; and a controller storing a time series command group for instructing driving of the control object A device for estimating and monitoring the temperature rise of the junction of the power elements constituting the power element unit,
In the controller, first memory means for storing parameter information related to a temperature rise of a joint including a joint allowable temperature of the power element;
While driving the controlled object, the change in the case temperature of the power element unit is calculated in consideration of the thermal time constant of the case, the change is accumulated to calculate the case temperature, and then the power element unit Calculate the temperature rise of the junction based on the current flowing through the junction, and further calculate the junction temperature of the power element by adding the calculated temperature rise to the calculated case temperature, Estimating the temperature rise of the power element junction comprising each processing procedure for comparing the calculated junction temperature of the power element with the allowable temperature of the junction of the power element stored in the first memory means and determining its magnitude And second memory means for storing a program for monitoring,
It can comprise.
In this case, the change in the case temperature is generated by applying a first-order low-pass filter to the product of the case temperature increase coefficient, which is one of the parameter information, and the current command value generated in the controller. Is preferred.
In this case, the control target is a servo motor, the power element unit is an AC servo driver for the servo motor, and the controller can be constituted by a computerized numerical control device.
In that case, the controller determines that the temperature of the junction of the power element exceeds the allowable junction temperature stored in the first memory means as a result of the determination by the program stored in the second memory means. In some cases, a warning signal is generated in response to the determination result, and a time series command group for commanding driving of the control target being executed can be commanded to be overridden.
In this case, the servo motor can be disposed in the injection mechanism of the electric injection molding machine and / or the drive unit of the clamping mechanism.

In order to achieve the above object, an apparatus having a function of estimating and monitoring the junction temperature of the power element according to the present invention is as follows.
A predetermined drive power is supplied to the control object in response to execution of the time-series instruction group, which is arranged between the control object and a controller storing a time-series instruction group for instructing driving of the control object. A power element unit that can be electrically coupled to the control target, and in order to estimate and monitor in real time the temperature rise of the junction of the power element constituting the power element unit,
When the control target is coupled with the controller and the control target, the change in the case temperature of the power element unit is calculated in consideration of the thermal time constant of the case, and the change is accumulated to calculate the case temperature. And then calculating the temperature rise of the junction of the power element based on the current flowing through the junction, and further adding the calculated temperature rise to the calculated case temperature. A program comprising each processing procedure for calculating a junction temperature and then comparing the calculated junction temperature of the power element with the allowable junction temperature of the power element stored in the first memory means and determining the magnitude thereof A program medium storing
Memory means for storing parameter information relating to a temperature rise of a junction including a junction allowable temperature of the power element, and
A central processing unit that reads and executes the program from the program medium is provided.
In that case, it can comprise so that the electric current command value produced | generated by the said controller may be taken in as the electric current which flows into the said junction part.
In this case, the power element unit can be configured by providing a sensor that detects a current flowing through the joint.

According to the present invention, the temperature of the junction of the power elements constituting the power element unit for supplying power to the controlled object is calculated by executing a program for estimating and monitoring the temperature of the junction. Since the temperature of the joint is estimated in real time and compared with the allowable temperature of the power element, it is possible to prevent damage to the joint due to heat in advance.

Hereinafter, examples based on the embodiment of the present invention will be described in detail with reference to FIGS. 1 to 6.
FIG. 1 is a conceptual diagram when the present invention is applied when a servo motor 3 incorporated in a drive mechanism of an electric injection molding machine 4 is a control target. In FIG. 1, reference numeral 1 is a servo amplifier, which generates a power element unit 6 for supplying power to a servo motor 3 formed by a power element generally called GTR (Giant Transistor) and a gate signal of the GTR. Servo controller 5 for Reference numeral 2 denotes a controller, in which a monitoring unit 8 for estimating and monitoring the junction temperature of the power element GTR of the power element unit 6 is provided. Further, the controller has a drive command signal generation unit 7 for giving drive / operation of the electric injection molding machine 4 via the servo motor 3.

At present, a computerized numerical controller CNC (Computerized Numerical Controller, hereinafter referred to as a CNC device) is commercially available as the controller 2 of the servo motor 3, and such a CNC device is an electric injection molding machine or a machine tool. It is used a lot.

FIG. 2 is a functional block diagram for explaining the relationship between the CNC device 100 and the servo driver 61 and the servo motor 3 provided with the estimation / monitoring program 543 in the CNC device 100. In FIG. 2, the CNC device 100 basically includes a central processing unit CPU 510, a program memory 540 for storing a command group to be executed by the CPU, various parameter data, various sensor signals referred to by the CPU, It comprises a data memory 550 for storing status signals, data and the like. Reference numerals 520 and 530 are a calculation unit and a servo processor for generating the rotation angle position θi of the servo motor, respectively, and the processing contents of the CPU 510 are clearly shown in blocks. Reference numerals PC, VC, VCT, and VD in the servo processor 530 represent processing functions of position control, speed control, current vector control, and speed detection, respectively. A reference code CRC in the servo driver 61 indicates current control processing. Reference numeral 62 indicated by a broken line denotes a Hall element that detects a current that actually flows through the excitation winding of the servo motor 3.

Reference numeral 31 is a rotation angle position sensor such as a rotary encoder coupled to the rotation shaft of the servo motor 3, and its output signal is fed back to the servo processor 530.
In the program memory 540, a program 543 for estimating / monitoring a junction temperature of the power element in the power element unit 6 and an override execution program 544 for executing the present invention are stored in the memory area 542.
On the other hand, the memory area 541 stores a molding command program PART1 corresponding to a series of commands (molding the first molded product) for driving a drive mechanism such as the injection molding machine via a servo motor. ing. (PART2 corresponds to the second molded product, and so on)

In the data memory 550, in the memory area 551, data information of various parameters referred to in the course of execution of the estimation / monitoring program 543 and the allowable temperature or allowable temperature limit data of the power element junction to be monitored are stored. Has been. The memory areas 552 and 553 store a current command value I that is referred to in the course of execution of the estimation / monitoring program 543 and a frequency f corresponding to the switching speed of the gate signal of the power element. Since the values of I and f constantly change depending on the operation of the injection molding machine, they are constantly updated. Further, the memory region 554 stores the temperature rise and the junction temperature data of the power device junction, and the memory region 555 stores the case temperature change and the case temperature data.
Note that the program memory 540 and the data memory 550 are not absolutely divided, and for example, the memory area 541 can be stored on the data memory 550 side.

FIG. 3 is a flowchart for explaining the main contents of the estimation / monitoring program 543. Hereinafter, steps ST1 to ST12 of processing by the program will be described.
In FIG. 3, when a start command is given, in step ST1, various parameter data necessary for subsequent arithmetic processing are set and confirmed as initialization processing. The parameter data includes an allowable temperature of the power element joint, a case temperature increase coefficient, a continuous allowable time of overheat warning information, and the like.
Furthermore, the case temperature rise is set to zero.

In step ST2, the change in the case temperature is calculated in consideration of the thermal time constant of the case part. Here, the calculation taking into account the thermal time constant is to apply a first-order low-pass filter approximating the case temperature time constant to the product of the case temperature rise coefficient (constant) and the current command value (variable). And the result is taken as the change in case temperature.
Next, in step ST3, a case temperature absolute value (° C.) (hereinafter simply referred to as case temperature) is calculated. The calculation of the case temperature is obtained by adding the change in the case temperature to the initial state, that is, the case temperature at no load (the increase is zero).
Next, in step 4, it is determined whether or not a DC lock state is established. Here, the DC lock state means that the electrical angular frequency of the servo motor is in a region of, for example, 30 Hz or less.

This determination is based on the amount of heat generated based on the copper loss related to the current flowing through the joint at the electrical angular frequency 30HZ and the iron loss related to the frequency of the current (corresponding to the electrical angular frequency of the servo motor). Since the ratio of the heat generation amount based on the difference is greatly different, the increase coefficient (parameter) used for calculating the temperature rise of the joint is set to specify different count values for the low frequency region of 30HZ or less and the region of 30HZ or more.
When the determination step ST4 is affirmative (Y), the increase in the junction temperature of each power element IGBT, FWD is calculated in steps ST5, ST6. On the other hand, when the result is negative (N), the increase in the junction temperature of each power element IGBT, FWD is calculated in steps ST7 and ST8 in the same manner.
Next, in steps ST9 and ST10, the junction temperature of each of the power elements IGBT and FWD is calculated. For example, in the case of the power element IGBT, this calculation is performed by adding the increase in the junction temperature calculated in ST5 or ST7 to the case temperature calculated in ST3.
Next, in step ST11, a determination process is executed. In this determination process, it is determined whether or not the junction temperature of the power elements IGBT and FWD calculated in steps ST9 and ST10 exceeds the allowable temperature. When the temperature exceeds the allowable temperature, a warning or warning is given as a determination signal to the controller, and the controller issues a warning to the operator via a display device, voice, or the like. Further, as a determination signal, the controller is instructed to apply the override, and the speed of the servo motor 3 is decreased at a predetermined rate. (The override execution program 544 is activated.)

Next, in step ST12, the presence / absence of a monitoring process end command is confirmed. If it is continued, the process returns to step ST2, and the same process is performed thereafter. If there is a monitoring process end instruction, the execution of the program 543 is ended. If the warning signal in step ST11 continues for a predetermined time, the servo output calculation is temporarily turned off as an error to protect the power element.
FIGS. 4A and 4B illustrate waveform diagrams for explaining the concept of the junction temperature estimation calculation of the power element in the power element unit 6. FIG. 4A shows the transition of the current command, and FIG. , (C) shows the junction temperature change (transition), and (d) shows the junction temperature (transition). The vertical axis of each waveform in FIG. 4 is shown as a ratio (%) so that the state of change is relatively easy. Further, the horizontal axis is shown by a common time scale t.
A fine scale on the time scale t is the elapsed time {circle around (1)} t of one cycle (ST1 to ST12) in the flowchart of FIG.

The waveform (a) of the current command changes greatly at times t0 to t6. It is shown that the waveform (c) of the junction temperature change closely follows the waveform (a). The increase in the junction temperature is given as a differential value of waveform (c) (increment with respect to the elapsed time ■ t). Therefore, this increment is zero between t0 and t1.
The case temperature change waveform (b) shows the result of applying a first-order low-pass filter to the current command waveform (a). For example, during the period from t0 to t1, the first-order lag with respect to the step input of the current command. It is a curve. As shown in the broken-line circle, the change amount D of the case temperature is given as a differential value (difference) during the elapsed time 2t.

According to the tests by the inventors, the thermal time constant of the case portion of the power element unit 6 is very close to a first-order lag function, which means that the case temperature change is first-order relative to the current command value in the present invention. This means that it is reasonable to generate by applying a low-pass filter.
The waveform (d) of the junction temperature is generated by adding the waveform (b) and the waveform (c).

FIG. 5 is a front view of the power element unit 9 on the heat sink 94 shown in FIG. In FIG. 5, reference numeral 86 is a gel substance that covers the semiconductor chip 87. The insulating plate 82 and the gel material 86 on the copper plate 83 form a case portion of the chip 87. The temperature change (transition) of the case portion 88 adjacent to the chip 87 indicated by a black dot corresponds to the waveform (b) in FIG. The heat generated in the chip 87 is conducted in the direction of the arrow until it reaches the fins 85 of the heat sink 84 from the chip 87 through the insulating plate 82 and the copper plate 83.

FIG. 6 is a configuration block diagram of a power element unit showing an example according to another embodiment of the present invention.
6, the power element unit 6 includes a GTR module 63 of a power element chip, a CPU 510, a program memory 540, and a data memory 550. These memories 540 and 550 include the estimation / monitoring program 543 described in FIG. Each parameter information is stored. The power element unit 6 is configured to execute the estimation / monitoring program 543 while the control target is being driven in a state of being connected to the control target and its controller. In this case, the current command value I necessary for the calculation can be taken from the controller side, but the current flowing in the GTR module may be detected by the current sensor 65 inside the power element unit.
The electrical angular frequency f is similarly handled by the frequency sensor 64. Reference symbol GTS · L indicates a line of a gate signal for switching to the GTR module (inverter) 63, and (f / I) · L is for taking in the frequency f and the current command value I from the controller side. Signal lines are shown.

The preferred embodiments of the present invention have been described with reference to the drawings. However, for the purpose of the present invention, the controlled object is not limited to the servo motors of the above-described embodiments. For example, for wafers in a semiconductor vapor phase growth apparatus. A device that is supplied with power from a power element unit, such as a high-power lamp as a mold heating unit in a glass lens molding device or a large display device for advertisement, such as a large display device for advertisement, as a chamber heating unit The means is a control object in the present invention.

Therefore, the power element unit in the present invention is not limited to a PWM type servo amplifier for a servo motor, and includes a power element IGBT having a function of supplying a large amount of power to the control target, and an FWD. Any circuit configuration may be used.
Therefore, in the present invention, driving is not limited to changing the position (rotation angle) or movement speed (rotation speed) by a servo motor, but in short, supplying power to the controlled object itself. It is meant that drive speed should therefore be interpreted as the amount of change in power supply.

The conceptual diagram when this invention is applied in the case of making the servo motor incorporated in the drive mechanism of an electric injection molding machine into a control object. FIG. 3 is a functional block diagram illustrating a relationship between the CNC device, a servo driver coupled to the CNC device, and a servo motor by providing an estimation / monitoring program in the CNC device. The flowchart explaining the main contents of the presumption / monitoring program in the present invention. It is a wave form diagram explaining the concept of the junction temperature estimation calculation of the power element in a power element unit, (a) is transition of an electric current command, (b) is case temperature change (transition), (c) is junction temperature change. (Transition) and (d) are junction temperature (transition). The front view of the power element unit arrange | positioned on the heat sink shown in FIG. The block diagram of the structure of the power element unit which shows the Example which concerns on other embodiment of this invention. A detailed circuit of a pulse width modulation (PWM) type inverter unit constituting a circuit for supplying three-phase AC power to a servo motor. The figure which illustrates temperature management of a power element as a general structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Servo amplifier 2 Controller 3 Servo motor 4 Electric injection molding machine 5 Servo control part 6 Power element unit 7 Drive command signal generation part 11 Converter part 12 Inverter part 31 Rotation angle position sensor 61 Servo driver 62 Hall element 63 GTR module 64 Current Sensor 65 Frequency sensor 81, 91 Lid 82, 92 Insulating plate 83, 93 Copper plate 84, 94 Heat sink (heat sink)
85, 95 Radiator 86 Gel-like substance 87, 96, 97 Semiconductor chip 88 Parts adjacent to semiconductor chip 98A, 98B Temperature sensor 99 Overheat detection switch 100 Computerized numerical control device 510 CPU
520 Servo motor rotation angle position calculation unit 530 Servo processor 540 Program memory 541, 542 Memory area 543 Estimation / monitoring program 544 Override execution program 550 Data memory 551, 552, 553, 554, 555 Memory area 801 Insulated gate bipolar transistor 802 Free Wheeling diode

Claims (16)

For the control object, comprising: a power element unit; a control object that is electrically connected and coupled to the power element unit and supplied with driving power; and a controller that stores a time-series command group for instructing driving of the control object. A method of estimating and monitoring a temperature rise in a joint portion of a power element that constitutes the power element unit of the drive device,
The method is
A first step of setting parameter information relating to a temperature rise of a junction including a junction allowable temperature of the power element;
A second stage of calculating a change in case temperature of the power element unit in consideration of a thermal time constant of the case during driving of the control target;
A third stage of calculating the case temperature by accumulating the change in the case temperature during the driving of the controlled object;
A fourth stage of calculating a temperature rise of the junction of the power element based on a current flowing through the junction during driving of the control target;
A fifth stage of calculating the junction temperature of the power element by adding the temperature increase calculated in the fourth stage to the case temperature calculated in the third stage during driving of the control target; ,
A sixth stage in which the allowable temperature of the power element junction set in the first stage is compared with the junction temperature of the power element calculated in the fifth stage to determine its magnitude;
A method for estimating and monitoring a temperature rise of a power element junction characterized by comprising: 2. The first-order low-pass filter according to claim 1, wherein a change in case temperature in the second stage is a first-order low-pass filter for a product of a case temperature increase coefficient which is one of the parameter information and a current command value generated in the controller. A method of estimating and monitoring the temperature rise of the power element junction, wherein the temperature rise of the power element junction is generated. 2. The temperature increase of the junction in the fourth stage according to claim 1, wherein the iron loss calculated based on the frequency of the same current as the temperature increase due to the copper loss calculated based on the current flowing through the junction A method of estimating and monitoring the temperature rise of the power element junction, wherein the temperature rise is generated as a sum of the temperature rise due to the power. 2. The temperature rise of the power element junction is estimated according to claim 1, wherein the calculation of the temperature rise of the junction in the fourth stage uses different parameter information in relation to the drive speed of the control target. And how to monitor. 5. The method according to claim 1, wherein, as a result of the determination in the sixth stage, a step of generating a warning signal when the junction temperature of the power element exceeds the set junction allowable temperature. A method for estimating and monitoring the temperature rise of the power device junction, further comprising the step. 6. The method according to claim 1, wherein, as a result of the determination in the sixth stage, when the junction temperature of the power element exceeds the set junction allowable temperature, the step of reducing the drive speed of the controlled object. The method of estimating and monitoring the temperature rise of the power device junction, wherein the sixth step further includes. 7. The temperature of the power element joint according to claim 1, wherein the object to be controlled is a servo motor, the power element unit is an AC servo driver, and the controller is a computerized numerical control device. How to estimate and monitor the rise. Control device drive device comprising: a power element unit; a control object electrically connected to and coupled to the power element unit and supplied with driving power; and a controller storing a time series command group for instructing driving of the control object A device for estimating and monitoring the temperature rise of the junction of the power elements constituting the power element unit,
In the controller, first memory means for storing parameter information related to a temperature rise of a joint including a joint allowable temperature of the power element;
While driving the control target, the change in the case temperature of the power element unit is calculated in consideration of the thermal time constant of the case, the change is accumulated to calculate the case temperature, and then the power element unit Calculate the temperature rise of the junction based on the current flowing through the junction, and further calculate the junction temperature of the power element by adding the calculated temperature rise to the calculated case temperature, Estimating the temperature rise of the power element junction comprising each processing procedure for comparing the calculated junction temperature of the power element with the allowable temperature of the junction of the power element stored in the first memory means and determining its magnitude And second memory means for storing a program for monitoring,
A device for estimating and monitoring the temperature rise of the power element joint, characterized by comprising: 9. The change in case temperature is generated by applying a first-order low-pass filter to a product of a case temperature increase coefficient which is one of the parameter information and a current command value generated in the controller. An apparatus for estimating and monitoring the temperature rise of the power element junction. 10. The power according to claim 8, wherein the control object is a servo motor, the power element unit is an AC servo driver for the servo motor, and the controller is a computerized numerical control device. A device that estimates and monitors the temperature rise at element junctions. 11. The controller according to claim 10, wherein, as a result of the determination by the program stored in the second memory unit, the junction temperature of the power element exceeds the junction allowable temperature stored in the first memory unit. And generating a warning signal in response to the determination result, and instructing the time series command group for commanding the servo motor being controlled to be overridden to be overridden. A device that estimates and monitors the temperature rise of power element joints. In Claim 10 or 11, the servo motor is disposed in an injection mechanism of an electric injection molding machine and / or a drive unit of a clamping mechanism, and estimates a temperature rise of a power element joint, Monitoring device. A predetermined drive power is supplied to the control object in response to execution of the time-series instruction group, which is arranged between the control object and a controller storing a time-series instruction group for instructing driving of the control object. A power element unit that can be electrically coupled to the control target, and in order to estimate and monitor in real time the temperature rise of the junction of the power element constituting the power element unit,
When the control target is coupled with the controller and the control target, the change in the case temperature of the power element unit is calculated in consideration of the thermal time constant of the case, and the change is accumulated to calculate the case temperature. And then calculating the temperature rise of the junction of the power element based on the current flowing through the junction, and further adding the calculated temperature rise to the calculated case temperature. A program comprising each processing procedure for calculating a junction temperature and then comparing the calculated junction temperature of the power element with the allowable junction temperature of the power element stored in the first memory means and determining the magnitude thereof A program medium storing
Memory means for storing parameter information relating to a temperature rise of a junction including a junction allowable temperature of the power element, and
A power element unit having a function of estimating and monitoring a temperature rise of a power element junction, comprising a central processing unit that reads and executes the program from the program medium. 14. A power element unit having a function of estimating and monitoring a temperature rise in a power element junction part according to claim 13, wherein a current command value generated by the controller is taken in as a current flowing in the junction part. . 14. The power element unit having a function of estimating and monitoring a temperature rise of a power element joint part according to claim 13, wherein a sensor for detecting a current flowing through the joint part is provided. 16. The power element unit according to claim 13, wherein the power element constitutes a pulse width modulation type inverter unit, and has a function of estimating and monitoring a temperature rise of a power element junction.

Images