US20170023956A1 - Motor driving device and detection method for detecting malfunction in heat radiation performance of heatsink - Google Patents

Motor driving device and detection method for detecting malfunction in heat radiation performance of heatsink Download PDF

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Publication number
US20170023956A1
US20170023956A1 US15/213,631 US201615213631A US2017023956A1 US 20170023956 A1 US20170023956 A1 US 20170023956A1 US 201615213631 A US201615213631 A US 201615213631A US 2017023956 A1 US2017023956 A1 US 2017023956A1
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United States
Prior art keywords
change
temperature
driving device
motor driving
amount
Prior art date
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Abandoned
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US15/213,631
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English (en)
Inventor
Genzo Naito
Kazuhiro Yamamoto
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Fanuc Corp
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Fanuc Corp
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Assigned to FANUC CORPORATION reassignment FANUC CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: NAITO, GENZO, YAMAMOTO, KAZUHIRO
Publication of US20170023956A1 publication Critical patent/US20170023956A1/en
Priority to US16/549,207 priority Critical patent/US11125830B2/en
Abandoned legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F3/00—Plate-like or laminated elements; Assemblies of plate-like or laminated elements
    • F28F3/02—Elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with recesses, with corrugations
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1919—Control of temperature characterised by the use of electric means characterised by the type of controller
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/40—Testing power supplies
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M99/00—Subject matter not provided for in other groups of this subclass
    • G01M99/002—Thermal testing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2039—Modifications to facilitate cooling, ventilating, or heating characterised by the heat transfer by conduction from the heat generating element to a dissipating body
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H05K7/20909—Forced ventilation, e.g. on heat dissipaters coupled to components
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K7/00—Constructional details common to different types of electric apparatus
    • H05K7/20—Modifications to facilitate cooling, ventilating, or heating
    • H05K7/2089—Modifications to facilitate cooling, ventilating, or heating for power electronics, e.g. for inverters for controlling motor
    • H05K7/20945—Thermal management, e.g. inverter temperature control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2200/00—Prediction; Simulation; Testing

Definitions

  • the invention relates to a motor driving device for detecting abnormalities in the heat radiation performance of a heatsink, and a detection method.
  • a heatsink and a fan for generating an air flow in the heatsink are attached to the electronic device. It has been known that, in such an electronic device, the thermal resistance of the heatsink is calculated from the temperature of the electronic device, and abnormalities in the performance of the heatsink are detected (see, for example, Japanese Unexamined Patent Publication (Kokai) No. 2009-130223).
  • a motor driving device for driving a motor embedded in, for example, a machine tool can control electric power to be supplied to the motor so that the electric power greatly varies in a short period of time.
  • the temperature of the motor driving device greatly varies in a short period of time.
  • the temperature of the electronic device should be detected when remaining in a steady state.
  • a motor driving device includes a heat generating element, a heatsink which cools the heat generating element, an electric power detecting part which detects a consumed power of the heat generating element, a temperature detecting part which detects a temperature of the motor driving device, and a temperature change calculating part which calculates an amount of change in the temperature within a predetermined time as a detected amount of change, based on the temperature detected by the temperature detecting part.
  • the motor driving device includes a reference determination part which determines a reference amount of change in the temperature based on the temperature detected by the temperature detecting part and the consumed power detected by the electric power detecting part, and a temperature change judging part which compares the reference amount of change determined by the reference determination part with the detected amount of change calculated by the temperature change calculating part, and judges whether the detected amount of change is different from the reference amount of change.
  • the temperature change judging part may judge that the detected amount of change is different from the reference amount of change when the detected amount of change is out of an allowable range predetermined so as to include the reference amount of change.
  • the temperature change judging part may judge whether the detected amount of change is different from the reference amount of change when the consumed power is zero and the detected amount of change is a negative value.
  • the motor driving device may include a fan which generates an air flow in the heatsink, a rotation number detecting part which detects a rotation number of the fan, and a rotation number judging part which judges whether the rotation number detected by the rotation number detecting part is different from a predetermined reference rotation number of the fan when the temperature change judging part judges that the detected amount of change is different from the reference amount of change.
  • the motor driving device may further include a malfunction signal generating part which generates a signal indicating that a malfunction occurs in the performance of the heatsink when the temperature change judging part judges that the detected amount of change is different from the reference amount of change.
  • the malfunction signal generating part may generate a signal indicating that a malfunction occurs in the performance of the heatsink when the temperature change judging part judges that the detected amount of change is different from the reference amount of change and the rotation number judging part judges that the rotation number is not different from the reference rotation number.
  • the malfunction signal generating part may generate a signal indicating that a malfunction occurs in the operation of the fan when the temperature change judging part judges that the detected amount of change is different from the reference amount of change and the rotation number judging part judges that the rotation number is different from the reference rotation number
  • the motor driving device may further include a steady state judging part which judges whether a temperature change of the motor driving device is in a steady state.
  • the temperature change calculating part may calculate the detected amount of change when the steady state judging part judges that the temperature change of the motor driving device is not in a steady state.
  • the steady state judging part judges that the temperature change of the motor driving device is in a steady state when the consumed power is constant for a predetermined period of time.
  • the motor driving device may include a thermal resistance calculating part which calculates a thermal resistance of the motor driving device based on the consumed power and the temperature detected by the temperature detecting part when the steady state judging part judges that the temperature change of the motor driving device is in a steady state.
  • the motor driving device may further include a thermal resistance judging part which judges whether the thermal resistance calculated by the thermal resistance calculating part is different from a predetermined reference thermal resistance.
  • a method of detecting a malfunction in the heat radiation performance of a heatsink provided at a motor driving device includes detecting a consumed power of a heat generating element provided at the motor driving device, detecting a temperature of the motor driving device, and calculating an amount of change in the temperature within a predetermined time as a detected change, based on the detected temperature.
  • the method includes determining a reference amount of change in the temperature based on the detected consumed power and the detected temperature, and comparing the determined reference amount of change with the calculated detected amount of change, and judging whether the detected amount of change is different from the reference amount of change.
  • FIG. 1 is a perspective view of a motor driving device according to an embodiment of the invention
  • FIG. 2 is a view of a heatsink assembly provided at the motor driving device shown in FIG. 1 ;
  • FIG. 3 is a view of the heatsink assembly shown in FIG. 2 as seen from the direction indicated by arrow III in FIG. 2 ;
  • FIG. 4 is a block diagram of the motor driving device shown in FIG. 1 ;
  • FIG. 5 is a graph showing a relationship between the temperature of the motor driving device and time, and a relationship between the consumed power of the heat generating element and time, wherein the temperature is in a steady state;
  • FIG. 6 is a graph showing a relationship between the temperature of the motor driving device and time, and a relationship between the consumed power of the heat generating element and time, wherein the temperature varies in a short period of time;
  • FIG. 7 is a flowchart showing an example of a processing flow of the motor driving device shown in FIG. 4 ;
  • FIG. 8 is a block diagram of a motor driving device according to another embodiment of the invention.
  • FIG. 9 is a flowchart showing an example of a processing flow of the motor driving device shown in FIG. 8 ;
  • FIG. 10 is a block diagram of a motor driving device according to still another embodiment of the invention.
  • FIG. 11 is a flowchart showing an example of a processing flow of the motor driving device shown in FIG. 10 .
  • the motor driving device 10 supplies electric power to a main motor (not shown) built in a machine tool, etc., in order to drive the main motor.
  • the motor driving device 10 includes a housing 12 , a controller 14 , a heatsink assembly 16 , heat generating elements 24 , and a temperature detecting part 26 .
  • the housing 12 is a box member made of e.g. a resin, and defines an inner space therein.
  • the controller 14 includes e.g. a CPU, and is mounted in the inner space of the housing 12 .
  • the controller 14 directly or indirectly controls each component of the motor driving device 10 .
  • the heatsink assembly 16 is provided to be adjacent to the housing 12 . As shown in FIGS. 2 and 3 , the heatsink assembly 16 includes a heatsink 20 and a fan 22 .
  • the heatsink 20 is a rectangular member having a longitudinal direction along the z-axis direction in the Cartesian coordinate system shown in FIGS. 2 and 3 .
  • the heatsink 20 has a first end part 20 a in the z-axis direction and a second end part 20 b opposite the first end part 20 a.
  • the heatsink 20 includes a plurality of heat radiation fins 28 .
  • Each of the heat radiation fins 28 is a plate member having a predetermined length in the z-axis direction, a predetermined thickness in the y-axis direction, and a predetermined width in the x-axis direction.
  • Each of the heat radiation fins 28 extends between the first end part 20 a and the second end part 20 b .
  • the heat radiation fins 28 are arranged to align in the y-axis direction at substantially equal intervals.
  • Flow paths 30 are each defined between two heat radiation fins 28 adjacent to each other in the y-axis direction. Each flow path 30 extends in the z-axis direction between the first end part 20 a and the second end part 20 b , and opens to the outside at the first end part 20 a and the second end part 20 b.
  • the fan 22 is attached to the first end part 20 a of the heatsink 20 .
  • the fan 22 includes a rotator (not shown) with a plurality of vanes, and a fan motor (not shown) which rotates the rotator.
  • the fan motor rotates the rotator of the fan 22 in accordance with a command from the controller 14 .
  • an air flow in e.g. the z-axis positive direction in FIG. 2 is generated in the flow paths 30 .
  • outside air is flown into the openings of the flow paths 30 at the second end part 20 b , passes through the flow paths 30 in the z-axis positive direction, and is discharged from the openings of the flow paths 30 at the first end part 20 a .
  • the heatsink 20 is cooled by the air flowing through the flow paths 30 as described above, thereby the motor driving device 10 is cooled.
  • the heat generating elements 24 and the temperature detecting part 26 are disposed on an outer surface 20 c of the heatsink 20 .
  • the heat generating elements 24 includes e.g. a power element, and generates electric power in accordance with a command from the controller 14 .
  • the controller 14 supplies the electric power generated by the heat generating elements 24 to the main motor of e.g. a machine tool so as to drive the main motor.
  • the temperature detecting part 26 includes a temperature sensor, and detects the temperature at a position at which the temperature detecting part 26 is disposed, in accordance with a command from the controller 14 .
  • the temperature detecting part 26 sends data of the detected temperature to the controller 14 .
  • the motor driving device 10 further includes an electric power detecting part 32 , a storage 34 , a timer 36 , and an alarm output part 38 .
  • the electric power detecting part 32 detects the consumed power of the heat generating elements 24 , and sends data of the detected consumed power to the controller 14 .
  • the electric power detecting part 32 is installed so as to detect the consumed power of one of the heat generating elements 24 .
  • the electric power detecting part 32 may be installed so as to detect the consumed power of the whole of a power amplifier (not shown) comprised of a plurality of heat generating elements 24 .
  • the storage 34 is comprised of e.g. a non-volatile memory which can electrically delete/record data, such as an EEPROM (trademark), or a random access memory which can rapidly read/write data, such as a DRAM, a SRAM, etc.
  • a non-volatile memory which can electrically delete/record data
  • EEPROM trademark
  • random access memory which can rapidly read/write data, such as a DRAM, a SRAM, etc.
  • the storage 34 is connected to the controller 14 so as to communicate with the controller 14 , and stores data received from the temperature detecting part 26 and the electric power detecting part 32 , and a reference amount of change that will be described later.
  • the storage 34 may be built in the controller 14 , or may be built in an external device (e.g., a server) which is installed outside of the controller 14 and which is connected to the controller 14 so as to communicate with the controller 14 via a network.
  • the timer 36 times an elapsed time from a predetermined time point in accordance with a command from the controller 14 .
  • the alarm output part 38 includes e.g. a speaker or display, and outputs a sound wave or an image in accordance with a command from the controller 14 .
  • the timer 36 may be built in the controller 14 , or in an external device installed outside of the controller 14 so as to be communicably connected to the controller.
  • the motor driving device 10 detects whether a malfunction occurs in the heat radiation performance of the heatsink 20 , based on an amount of change in the temperature detected by the temperature detecting part 26 with respect to time.
  • FIGS. 5 and 6 The concept of a method of detecting a malfunction in the heat radiation performance of the heatsink 20 of the motor driving device 10 will be described below with reference to FIGS. 5 and 6 .
  • Each of the graphs in the upper sections of FIGS. 5 and 6 shows a relationship between temperature T detected by the temperature detecting part 26 and time t, while each of the graphs in the lower sections of FIGS. 5 and 6 shows a relationship between electric power P detected by the electric power detecting part 32 and time t.
  • each of solid lines 42 and 46 in FIGS. 5 and 6 represents a characteristic in a case where foreign substances do not accumulate in the flow paths 30 of the heatsink 20 , and the heat radiation performance of the heatsink 20 is normal (hereinafter referred as “normal product”).
  • each of dashed-dotted lines 40 and 44 in FIGS. 5 and 6 represents a characteristic in a case where foreign substances accumulate in the flow paths 30 of the heatsink 20 , thereby an air flow in the flow paths 30 are disturbed so that the heat radiation performance of the heatsink 20 is reduced (hereinafter referred as “malfunction product”).
  • the temperature T also varies in a short period of time so as to follow the variation of the consumed power P, thereby does not shift to a steady state. In this case, it is not possible to accurately calculate the thermal resistance of the motor driving device 10 .
  • the consumed power varies in a short period of time, and therefore the temperature T greatly varies in a short period of time as shown in the upper graph of FIG. 6 .
  • the degree of decrease in the temperature with respect to time of the malfunction product i.e., dashed-dotted line 44
  • that of the normal product i.e., solid line 46 .
  • the gradient (or time-derivative coefficient) of the characteristic of the malfunction product when the temperature increases and when the temperature decreases is remarkably different from that of the normal product.
  • the motor driving device 10 detects whether a malfunction occurs in the heat radiation performance of the heatsink 20 by comparing an amount of change in the temperature with respect to time of the normal product (a reference amount of change) with an amount of change in the temperature detected by the temperature detecting part 26 with respect to time (a detected amount of change).
  • the processing flow shown in FIG. 7 is started when the controller 14 receives a motor drive command for driving the main motor built in a machine tool, etc., from e.g. a user or a host controller (e.g., a machine tool controller).
  • a host controller e.g., a machine tool controller
  • the controller 14 starts to time an elapsed time. Specifically, the controller 14 sends a timing start command to the timer 36 .
  • the timer 36 times an elapsed time from the time point when it has received the timing starting command from the controller 14 .
  • the controller 14 repeatedly executes a loop of steps S 2 to S 7 at a period ⁇ (e.g., one second) until it judges “YES” at step S 6 or S 8 .
  • a period ⁇ e.g., one second
  • the controller 14 detects a temperature T n of the motor driving device 10 . Specifically, the controller 14 transmits a command to the temperature detecting part 26 so as to detect a temperature at the position where the temperature detecting part 26 is disposed. The controller 14 records data of the temperature acquired from the temperature detecting part 26 onto the storage 34 .
  • the controller 14 detects a consumed power P n of the heat generating elements 24 . Specifically, the controller 14 transmits a command to the electric power detecting part 32 so as to detect a consumed power of the heat generating elements 24 . The controller 14 records data of the consumed power acquired from the electric power detecting part 32 onto the storage 34 .
  • the controller 14 functions as a temperature change calculating part 48 ( FIG. 4 ) which calculates the detected amount of change ( ⁇ T n , ⁇ T n / ⁇ t).
  • the controller 14 determines a reference amount of change ⁇ T ref based on the temperature T n acquired at step S 2 and the consumed power P n acquired at step S 3 .
  • the reference amount of change ⁇ T ref is a parameter corresponding to a degree of temperature change with respect to time of the normal product (solid line 46 ) in FIG. 6 .
  • the reference amount of change ⁇ T ref is set as a parameter corresponding to a temperature change within the time ⁇ of the characteristic of the normal product in FIG. 6 .
  • the reference amount of change ⁇ T ref is set as a parameter corresponding to a gradient (time-derivative coefficient) of the characteristic of the normal product in FIG. 6 .
  • the reference amount of change ⁇ T ref is pre-stored in the storage 34 in association with the this step S 5 , the controller 14 reads out from the storage 34 a reference amount of change associated with the temperature T n acquired at step S 2 and the consumed power P n acquired at step S 3 , and determines it as the reference amount of change ⁇ T ref .
  • the reference amount of change ⁇ T ref is defined as a function of the temperature T and the consumed power P.
  • the controller 14 calculates the reference amount of change ⁇ T ref from the temperature T n acquired at step S 2 and the consumed power P n acquired at step S 3 .
  • the controller 14 functions as a reference determination part 50 ( FIG. 4 ) which determines the reference amount of change ⁇ T ref based on the temperature T n detected by the temperature detecting part 26 and the consumed power P n detected by the electric power detecting part 32 .
  • the controller 14 compares the detected amount of change ( ⁇ T, ⁇ T n / ⁇ t) calculated at step S 4 with the reference amount of change ⁇ T ref determined at step S 5 , and judges whether the detected amount of change is different from the reference amount of change ⁇ T ref .
  • the controller 14 judges that the detected amount of change ⁇ T n , ⁇ T n / ⁇ t is different from the reference amount of change ⁇ T ref (i.e., judges “YES”), and proceeds to step S 10 .
  • the controller 14 determines that the reference amount of change ⁇ T ref (i.e., judges “NO”), and proceeds to step S 7 .
  • the controller 14 judges whether the detected amount of change ⁇ T n , ⁇ T n / ⁇ t falls within an allowable range which is predetermined so as to include the reference amount of change ⁇ T ref (e.g., within a range of ⁇ 5% of the reference amount of change ⁇ T ref ).
  • the controller 14 judges that the detected amount of change is different from the reference amount of change ⁇ T ref (i.e., judges “YES”), and proceeds to step S 10 .
  • the controller 14 judges that the detected amount of change is not different from the reference amount of change ⁇ T ref (i.e., judges “NO”), and proceeds to step S 7 .
  • the controller 14 functions as a temperature change judging part 52 ( FIG. 4 ) which compares the reference amount of change ⁇ T ref with the detected amount of change ( ⁇ T n , ⁇ T n / ⁇ t), and judges whether the detected amount of change is different from the reference amount of change.
  • step S 7 the controller 14 judges whether the elapsed time clocked by the timer 36 has reached ⁇ n ( ⁇ : period, n: the number of repetition of the loop).
  • ⁇ n period, n: the number of repetition of the loop.
  • the controller 14 judges that the elapsed time has reached T ⁇ n (i.e., judges “YES”)
  • the controller 14 returns to step S 2 .
  • the controller 14 judges that the elapsed time has not reached ⁇ n (i.e., judges “NO”)
  • the controller 14 proceeds to step S 8 .
  • step S 8 the controller 14 judges whether it has received a stop command for stopping the operation of the When The controller 14 judges that it has received the stop command (i.e., judges “YES”), the controller 14 proceeds to step S 9 . On the other hand, when the controller 14 judges that it has not received the stop command (i.e., judges “NO”), the controller 14 returns to step S 7 .
  • the controller 14 When it is judged “YES” at step S 6 , at step S 10 , the controller 14 generates a malfunction notification signal indicating that a malfunction occurs in the heat radiation performance of the heatsink 20 .
  • the controller 14 generates the malfunction notification signal in the form of an audio signal of an alarm for a user.
  • the controller 14 generates the malfunction notification signal in the form of an image signal of an alarm visible to a user.
  • the controller 14 functions as a malfunction signal generating part 53 ( FIG. 4 ) which generates a signal indicating that a malfunction occurs in the performance of the heatsink 20 .
  • the controller 14 notifies a user that a malfunction occurs in the heat radiation performance of the heatsink 20 , via the alarm output part 38 .
  • the controller 14 transmits the audio signal to the alarm output part 38 .
  • the alarm output part 38 includes a speaker and outputs the received audio signal as an alarm sound.
  • the controller 14 transmits the image signal to the alarm output part 38 .
  • the alarm output part 38 includes a display and displays an alarm image corresponding to the received image signal.
  • the controller 14 stops the operation of the motor driving device 10 . Specifically, the controller 14 stops the supply of electric power to the heat generating elements 24 , thereby stops the supply of electric power to the main motor.
  • the controller 14 repeatedly executes a loop of steps S 2 to S 7 at the period ⁇ until it judges “YES” at step S 6 or S 8 , and calculates the detected amount of change ( ⁇ T n , ⁇ T n / ⁇ t) with respect to the time ⁇ , at intervals of the predetermined time T,.
  • the controller 14 constantly monitors whether the detected amount of change is different from the reference amount of change ⁇ T ref . According to this configuration, it is possible to detect a malfunction in the heat radiation performance of the heatsink 20 , even if the temperature T of the motor driving device 10 varies in a short period of time as shown in FIG. 6 .
  • a malfunction in the heat radiation performance of the heatsink 20 is detected, a user is automatically informed of the malfunction by the alarm output part 38 . Accordingly, the user can automatically and reliably recognize that it is necessary to remove foreign substances from the flow paths 30 for maintenance, for example.
  • controller 14 may execute step S 6 only when the temperature T of the motor driving device 10 increases or when the temperature T decreases. This configuration will be described below.
  • the controller 14 can reliably detect an abnormality in the detected amount of change ( ⁇ T 1 , ⁇ T n / ⁇ t) at step S 6 , if it executes step S 6 when the increase or decrease of the temperature T is detected.
  • the controller 14 executes step S 6 when the consumed power P detected at step S 3 has been zero.
  • the temperature T detected by the temperature detecting part 26 decreases, and therefore the detected amount of change ( ⁇ T, ⁇ T n / ⁇ t) detected at step S 4 is a negative value.
  • the motor driving device 60 includes the housing 12 ( FIG. 1 ), a controller 62 , the heatsink assembly 16 ( FIG. 2 , FIG. 3 ), the heat generating element 24 , the temperature detecting part 26 , the electric power detecting part 32 , the storage 34 , the timer 36 , the alarm output part 38 , and a rotation number detecting part 64 .
  • the heatsink assembly 16 includes the heatsink 20 and the fan 22 .
  • the rotation number detecting part 64 is comprised of e.g. an encoder, and detects the rotation number of the rotator of the fan 22 .
  • the rotation number detecting part 64 sends data of the rotation number of the fan 22 to the controller 62 .
  • the controller 62 detects the rotation number of the fan 22 . Specifically, the controller 62 sends a command to the rotation number detecting part 64 so as to detect a rotation number R n of the fan 22 . The controller 62 records onto the storage 34 data of the rotation number R n of the fan 22 received from the rotation number detecting part 64 .
  • the controller 62 judges whether the rotation number R n acquired at step S 21 is different from a predetermined reference rotation number R ref .
  • the reference rotation number R ref is predetermined as a value required for operating the fan 22 in a regular mode when the motor driving device 60 supplies electric power to the main motor of a machine tool, etc.
  • the storage 34 pre-stores the reference rotation number R ref .
  • the controller 62 judges whether the rotation number R n acquired at step S 21 falls within a predetermined allowable range (e.g., a range of ⁇ 5% of the reference rotation number R ref ). When the rotation number R n is out of the allowable range, the controller 62 judges that the rotation number R n is different from the reference rotation number R ref .
  • a predetermined allowable range e.g., a range of ⁇ 5% of the reference rotation number R ref .
  • the controller 62 functions as a rotation number judging part 66 ( FIG. 8 ) which judges whether the rotation number R n of the fan 22 is different from the reference rotation number R ref .
  • step S 24 When the controller 62 judges that the rotation number R n is different from the reference rotation number R ref (i.e., judges “YES”), it proceeds to step S 24 . On the other hand, when the controller 62 judges that the rotation number R n is not different from the reference rotation number R ref (i.e., judges “NO”), it proceeds to step S 23 .
  • the controller 62 generates a first malfunction notification signal indicating that a malfunction occurs in the heat radiation performance of the heatsink 20 .
  • the controller 62 generates a second malfunction notification signal indicating that a malfunction occurs in the operation of the fan 22 .
  • the controller 62 transmits the first malfunction notification signal generated at step S 23 or the second malfunction notification signal generated at step S 24 to the alarm output part 38 .
  • the alarm output part 38 receives the first malfunction notification signal from the controller 62 , it outputs to a user an alarm sound or image representing the occurrence of a malfunction in the heat radiation performance of the heatsink 20 .
  • the alarm output part 38 receives the second malfunction notification signal from the controller 62 , it outputs to a user an alarm sound or image representing the occurrence of a malfunction in the operation of the fan 22 .
  • the motor driving device 70 includes the housing 12 ( FIG. 1 ), a controller 72 , the heatsink assembly 16 ( FIG. 2 , FIG. 3 ), the heat generating element 24 , the temperature detecting part 26 , the electric power detecting part 32 , the storage 34 , the timer 36 , and the alarm output part 38 .
  • the heatsink assembly 16 includes the heatsink 20 and fan 22 .
  • the controller 72 judges whether a temperature change of the motor driving device 70 is in a steady state, and if the temperature change is in a steady state, the controller 72 detects a malfunction in the heatsink based on the thermal resistance of the motor driving device 70 .
  • the controller 72 judges whether a temperature change of the motor driving device 70 is in a steady state. As an example, the controller 72 determines that the temperature change of the motor driving device 70 is in a steady state, when the consumed power P acquired at step S 3 is substantially constant for a predetermined period of time.
  • the controller 72 determines that the temperature change of the motor driving device 70 is in a steady state, when the variation in the consumed powers P n ⁇ n to P acquired at each step S 3 during the controller T n ⁇ n 72 repeatedly executes step S 7 by “m” times (i.e., a period of ⁇ m) falls within a predetermined range (e.g., a range of ⁇ 5%).
  • the controller 72 may determine that the temperature change of the motor driving device 70 is in a steady state, when the temperature T acquired at step S 2 is substantially constant for a predetermined period of time. Specifically, the controller 72 determines that the temperature change of the motor driving device 70 is in a steady state, when the variation in the temperatures T n ⁇ m to T n acquired at each step S 2 during the controller 72 repeatedly executes step S 7 by “m” times (i.e., a period of ⁇ m) falls within a predetermined range (e.g., a range of ⁇ 5%).
  • the controller 72 functions as a steady state judging part 74 ( FIG. 10 ) which judges whether the temperature change of the motor driving device 70 is in a steady state.
  • step S 32 When the controller 72 judges that the temperature change of the motor driving device 70 is in a steady state (i.e., judges “YES”), it proceeds to step S 32 . On the other hand, when the controller 72 judges that the temperature change of the motor driving device 70 is not in a steady state (i.e., judges “NO”), it proceeds to step S 4 .
  • the controller 72 calculates a thermal resistance of the motor driving device 70 . Specifically, the controller 72 calculates a thermal resistance Z n of the motor driving device 70 by substituting the temperature T n acquired at step S 2 in the n-th loop, a reference temperature T o , and the consumed power P n acquired at step S 3 in the n-th loop into Equation 1 below.
  • the reference temperature T 0 may be a temperature measured by the temperature detecting part 26 before electric power is applied to the heat generating element 24 .
  • the reference temperature T 0 may be an ambient temperature around the motor driving device 10 .
  • another temperature detecting part for measuring the ambient temperature may be provided.
  • the controller 72 functions as a thermal resistance calculating part 76 ( FIG. 10 ) which calculates the thermal resistance of the motor driving device 70 .
  • the controller 72 judges whether the thermal resistance Z n calculated at step S 32 is different from a predetermined reference thermal resistance Z ref .
  • the reference thermal resistance Z ref is predetermined depending on the temperature T of the motor driving device 70 and the consumed power P of the heat generating element 24 , and is pre-stored in the storage 34 .
  • the reference thermal resistance Z ref can be obtained by a theoretical, experimental, or simulation method.
  • the controller 72 judges whether the thermal resistance Z n calculated at step S 32 falls within a predetermined allowable range (e.g., a range of ⁇ 5% of the reference thermal resistance Z ref ) . When the thermal resistance Z n is out of the allowable range, the controller 72 judges that the thermal resistance Z n is different from the reference thermal resistance Z ref .
  • a predetermined allowable range e.g., a range of ⁇ 5% of the reference thermal resistance Z ref
  • the controller 72 functions as a thermal resistance judging part 78 ( FIG. 10 ) which judges whether the thermal resistance Z n calculated at step S 32 is different from the reference thermal resistance Z ref .
  • step S 10 When the controller 72 judges that the thermal resistance Z n is different from the reference thermal resistance Z ref (i.e., judges “YES”), it proceeds to step S 10 . On the other hand, when the controller 72 judges that the thermal resistance Z n is not different from the reference thermal resistance Z ref (i.e., judges “NO”), it proceeds to step S 7 .
  • this embodiment it is possible to detect a malfunction in the heat radiation performance of the heatsink 20 , both when the temperature of the motor driving device 70 varies in a short period of time and when the temperature of the motor driving device 70 is in a steady state. Due to this, it is possible to reliably detect a malfunction in the heat radiation performance of the heatsink 20 even if the motor driving device 70 is operated in various operation modes.
  • the heatsink 20 may have any shape.
  • the heatsink may be configured to have a polygonal or circular outer shape.
  • the heat generating element 24 may be indirectly attached to the heatsink 20 via another member made of e.g. a heat conducting material.
  • the heat generating element 24 may be attached to any element other than the heatsink 20 , which is a component of the motor driving device 10 , 60 , 70 .
  • the fan 22 may be omitted.
  • the heatsink 20 naturally air-cools the motor driving device. Even in such a case, foreign substances may adhere to the surface of the heatsink 20 , thereby the heat radiation performance of the heatsink 20 may be reduced. According the invention, such a malfunction in the heatsink 20 can be detected.
  • controller 14 , 62 , 72 judges “YES” at step S 6 , it may execute step S 9 without carrying out steps S 10 and S 11 . Further, when the controller 14 , 62 , 72 judges “YES” at step S 6 , it may omit step S 9 after executing steps S 10 and S 11 b.
  • steps S 21 to S 24 in FIG. 9 can be incorporated in the processing flow in FIG. 7 or 11 .
  • steps S 21 to S 24 in FIG. 9 are incorporated in the processing in FIG. 11 , these steps S 21 to S 24 in FIG. 9 can be executed after steps S 6 and S 33 in FIG. 11 .
US15/213,631 2015-07-21 2016-07-19 Motor driving device and detection method for detecting malfunction in heat radiation performance of heatsink Abandoned US20170023956A1 (en)

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DE102016112923A1 (de) 2017-01-26
US11125830B2 (en) 2021-09-21

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