US20170102000A1 - Motor drive device capable of informing malfunction in operation of fan, and method thereof - Google Patents
Motor drive device capable of informing malfunction in operation of fan, and method thereof Download PDFInfo
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- US20170102000A1 US20170102000A1 US15/284,910 US201615284910A US2017102000A1 US 20170102000 A1 US20170102000 A1 US 20170102000A1 US 201615284910 A US201615284910 A US 201615284910A US 2017102000 A1 US2017102000 A1 US 2017102000A1
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- United States
- Prior art keywords
- rotation speed
- fan
- relationship
- malfunction
- drive device
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/002—Axial flow fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/001—Testing thereof; Determination or simulation of flow characteristics; Stall or surge detection, e.g. condition monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/26—Rotors specially for elastic fluids
- F04D29/32—Rotors specially for elastic fluids for axial flow pumps
- F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/24—Reminder alarms, e.g. anti-loss alarms
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/002—Axial flow fans
- F04D19/005—Axial flow fans reversible fans
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D19/00—Axial-flow pumps
- F04D19/007—Axial-flow pumps multistage fans
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Definitions
- the invention relates to a motor drive device capable of informing a user of a malfunction in the operation of a fan, and a method thereof.
- a device capable of detecting a malfunction in the rotation speed of a fan has been known (see, for example, Japanese Unexamined Patent Publication (Kokai) No. 10-28394).
- a control scheme for stopping the operation of the motor drive device when a malfunction in a fan is detected is used in some cases.
- a motor drive device includes a fan, a fan controller which controls the fan, a rotation speed detecting part which detects the rotation speed of the fan, and a relationship acquiring part which acquires a relationship between a time elapsed from a time point, at which the fan controller changes the rotation speed, and the rotation speed detected by the rotation speed detecting part.
- the motor drive device includes a malfunction determining part which determines whether the relationship acquired by the relationship acquiring part is different from a predetermined standard, and a malfunction signal generating part which generates a signal indicating that a malfunction occurs in the fan when the malfunction determining part determines that the relationship is different from the standard.
- the relationship acquiring part may acquire, as the relationship, an amount of change in the rotation speed detected by the rotation speed detecting part within a time period until a predetermined time elapses from the time point at which the fan controller sends to the fan a command for changing the rotation speed.
- the malfunction determining part may determine that the relationship is different from the standard when the acquired amount of change is greater or smaller than a predetermined threshold value.
- the relationship acquiring part may calculate, as the relationship, a ratio of an amount of change in the rotation speed detected by the rotation speed detecting part within a time period until a predetermined time elapses from the time point at which the fan controller sends to the fan a command for changing the rotation speed, to the standard.
- the malfunction determining part may determine that the relationship is different from the standard when the ratio is greater or smaller than a predetermined threshold value.
- the relationship acquiring part may acquire, as the relationship, a time until the rotation speed detected by the rotation speed detecting part changes from a first rotation speed to a second rotation speed different from the first rotation speed when the fan controller sends to the fan a command for changing the rotation speed from the first rotation speed to the second rotation speed.
- the malfunction determining part may determine that the relationship is different from the standard when the acquired time is greater or smaller than a predetermined threshold value.
- the motor drive device may further include a timer which measures a time from a time point at which the fan controller changes the rotation speed.
- the motor drive device may further include a storage which stores the rotation speed detected by the rotation speed detecting part or the time from the time point at which the fan controller changes the rotation speed.
- the motor drive device may further include an alarm output part which receives the signal and outputs an alarm to a user.
- a method of notifying a user of an occurrence of a malfunction in a fan provided at a motor drive device comprises changing a rotation speed of the fan, and detecting the rotation speed when changing the rotation speed.
- the method comprises acquiring a relationship between a time elapsed from a time point, at which the rotation speed is changed, and the detected rotation speed, determining whether the acquired relationship is different from a predetermined standard, and notifying to a user that a malfunction occurs in the fan when determining that the relationship is different from the standard.
- FIG. 1 is a perspective view of a motor drive device according to an embodiment of the invention
- FIG. 2 is a block diagram of the motor drive device shown in FIG. 1 ;
- FIG. 3 is a front view of the fan shown in FIG. 2 ;
- FIG. 4 is a graph representing a relationship between the rotation speed of the fan and time when the rotation speed is decreased
- FIG. 5 is a graph representing a relationship between the rotation speed of the fan and time when the rotation speed is increased
- FIG. 6 is a flowchart of an example of the operation flow of the motor drive device shown in FIG. 1 ;
- FIG. 7 is a flowchart of another example of the operation flow of the motor drive device shown in FIG. 1 .
- the motor drive device 10 supplies electric power to a servomotor (not shown) built in e.g. a machine tool or industrial robot in order to drive the servomotor.
- a servomotor not shown
- the motor drive device 10 includes a housing 12 .
- the housing 12 is e.g. a box-shaped member made of resin, and houses therein components including a controller 16 described later.
- a through-hole 14 is formed at the housing 12 .
- the motor drive device 10 further includes the controller 16 , a fan 18 , a rotation speed detecting part 19 , an alarm output part 20 , a timer 22 , and a storage 24 .
- the controller 16 includes e.g. a CPU, and is housed in the housing 12 .
- the controller 16 directly or indirectly controls each component of the motor drive device 10 .
- the fan 18 is housed in the housing 12 so as to face the through-hole 14 formed at the housing 12 .
- the fan 18 includes a rotator 28 having a plurality of vanes 26 , and a fan motor 30 which rotates the rotator 28 .
- the rotator 28 is arranged to be adjacent to the through-hole 14 formed at the housing 12 .
- the fan motor 30 is connected to an inverter 32 ( FIG. 2 ).
- the inverter 32 supplies electric power to the fan motor 30 in accordance with a command from the controller 16 .
- the fan motor 30 drives the rotator 28 to rotate at the rotation speed corresponding to the electric power supplied from the inverter 32 .
- an air in the housing 12 is discharged to the outside through the through-hole 14 , thereby the motor drive device 10 is cooled.
- the rotation speed detecting part 19 includes e.g. an encoder or Hall element, and is attached to the fan 18 .
- the rotation speed detecting part 19 detects the rotation speed of the rotator 28 of the fan 18 in accordance with a command from the controller 16 , and sends data of the detected rotation speed of the fan 18 to the controller 16 .
- the alarm output part 20 includes e.g. a speaker or display part, and outputs a sound or image in accordance with a command from the controller 16 .
- the timer 22 times an elapsed time from a given time point in accordance with a command from the controller 16 .
- the storage 24 includes e.g. a non-volatile memory such as an EEPROM (registered trademark) which can electrically delete and record data, or a random access memory such as DRAM or SRAM which can rapidly read out and write on data.
- the controller 16 can record data on, and delete data from the storage 24 .
- the motor drive device 10 detects such malfunction in the fan 18 .
- FIG. 4 is a graph showing the relationship between rotation speed R of the fan 18 and time t when the controller 16 sends a rotation speed changing command to the fan motor 30 at a time point t 1 so as to reduces the rotation speed of the fan 18 from a rotation speed R 2 to a rotation speed R 1 .
- FIG. 5 is a graph showing the relationship between rotation speed R of the fan 18 and time t when the controller 16 sends a rotation speed changing command to the fan motor 30 at a time point t 4 so as to increase the rotation speed of the fan 18 from a rotation speed R 4 to a rotation speed R 5 .
- FIG. 5 represent characteristics when the fan 18 normally operates (hereinafter, referred as a “normal product”).
- a broken line 36 in FIG. 4 and a broken line 40 in FIG. 5 represent characteristics when foreign substances attach to the rotator 28 of the fan 18 , thereby an operational malfunction occurs in the fan 18 (hereinafter, referred as a “malfunction product”).
- the rotation speed R when the rotation speed R is decreased, the rotation speed R reduces relatively moderately from the time point t 1 , and reaches the rotation speed R 1 at a time point t 3 .
- the rotation speed R decreases from the time point t 1 more sharply than in the normal product, and reaches the rotation speed R 1 at a time point t 2 ( ⁇ t 3 ).
- the motor drive device 10 detects a malfunction in the fan 18 by making use of the above-mentioned difference between the t ⁇ R relationships of the normal product and the malfunction product.
- the t ⁇ R relationship in the fan 18 can be evaluated by various parameters described below.
- an amount of change ⁇ R ref in the rotation speed R of the normal product within a time period t 1 ⁇ 2 is ⁇ R ref ⁇ R 2 ⁇ R 3 .
- an amount of change ⁇ R in the rotation speed R of the malfunction product within the time period t 1 ⁇ 2 is ⁇ R ⁇ R 2 ⁇ R 1 .
- the amount of change ⁇ R in the malfunction product is remarkably larger than the amount of change ⁇ R ref in the normal product.
- a malfunction in the operating fan 18 can be detected by acquiring the amount of change ⁇ R as a parameter representing the t ⁇ R relationship of the fan 18 , and comparing it with the ⁇ R ref in the normal product, which is to be used as a standard.
- the time period t 1 ⁇ 2 in the malfunction product is remarkably smaller than the time period t 1 ⁇ 3 in the normal product.
- a malfunction in the operating fan 18 can be detected by obtaining the time period t 1 ⁇ 2 as a parameter representing the t ⁇ R relationship in the fan 18 , and comparing it with the time period t 1 ⁇ 3 in the normal product, which is to be used as a standard.
- the rotation speed R increases relatively sharply from the time point t 4 , and reaches the rotation speed R 5 at a time point t 5 .
- the rotation speed R increases from the time point t 4 more moderately than in the characteristic of the normal product, and reaches the rotation speed R 5 at a time point t 6 .
- the amount of change ⁇ R of the malfunction product is remarkably smaller than the amount of change ⁇ R ref of the normal product.
- a malfunction in the operating fan 18 can be detected by acquiring the amount of change ⁇ R as a parameter representing the t ⁇ R relationship of the operating fan 18 , and comparing it with the ⁇ R ref of the normal product, which is to be used as a standard.
- the time period t 4 ⁇ 6 of the malfunction product is remarkably greater than the time period t 4 ⁇ 5 of the normal product.
- a malfunction in the operating fan 18 can be detected by acquiring the time period t 4 ⁇ 6 as a parameter representing the t ⁇ R relationship of the operating fan 18 , and comparing it with the time period t 4 ⁇ 5 of the normal product, which is to be used as a standard.
- the motor drive device 10 detects whether a malfunction occurs in the fan 18 , by making use of the various parameters ( ⁇ R, t 1 ⁇ 2 , ⁇ R/ ⁇ t, t 4 ⁇ 6 ) and standards ( ⁇ R ref , t 1 ⁇ 3 , ⁇ R ref / ⁇ t, t 4 ⁇ 5 ).
- the flow shown in FIG. 6 is started when the controller 16 receives from a user, host controller or control program a malfunction inspection command for inspecting an operational malfunction in the fan 18 .
- the controller 16 receives the malfunction inspection command when it increases the rotation speed of the fan 18 from zero to a normal rotation speed (i.e., when the supply of electric power from the inverter 32 to the fan motor 30 is started) in order to normally operate the fan 18 .
- the controller 16 receives the malfunction inspection command when it decreases the rotation speed of the fan 18 from the normal rotation speed to zero (i.e., when the supply of electric power from the inverter 32 to the fan motor 30 is stopped) in order to stop the fan 18 in normal operation.
- the controller 16 receives the malfunction inspection command when the process is interrupted during the normal operation of the fan 18 .
- the above-described normal rotation speed is pre-set as a required value for normally operating the fan 18 .
- the controller 16 changes the rotation speed of the fan 18 .
- the controller 16 sends a rotation speed changing command to the inverter 32 so as to decrease the rotation speed R of the fan 18 , which is rotating at the rotation speed R 2 (e.g., the normal rotation speed), from the rotation speed R 2 to the rotation speed R 1 (e.g., zero).
- the controller 16 sends a rotation speed changing command to the inverter 32 so as to increase the rotation speed R of the fan 18 , which is rotating at the rotation speed R 4 (e.g., zero), from the rotation speed R 4 to the rotation speed R 5 (e.g., normal rotation speed).
- the rotation speed R 4 e.g., zero
- the rotation speed R 5 e.g., normal rotation speed
- the inverter 32 controls electric power supplied to the fan motor 30 so as to change the rotation speed R of the fan 18 to a rotation speed (R 1 or R 5 ) in accordance with the rotation speed changing command received from the controller 16 .
- the controller 16 functions as a fan controller 42 ( FIG. 2 ) which controls the operation of the fan 18 .
- the controller 16 acquires a rotation speed R x of the fan 18 . Specifically, the controller 16 sends a command to the rotation speed detecting part 19 so as to detect the rotation speed R x of the rotator 28 of the fan 18 at this time. The controller 16 receives data of the rotation speed R x from the rotation speed detecting part 19 , and records it on the storage 24 .
- the rotation speed R x measured at step S 2 substantially coincides with the rotation speed R 2 at the time point t 1 in FIG. 4 .
- the rotation speed R x measured at step S 2 substantially coincides with the rotation speed R 4 at the time point t 4 in FIG. 5 .
- the controller 16 start to time an elapsed time. Specifically, the controller 16 sends a timing start command for starting to time an elapsed time to the timer 22 .
- the timer 22 times an elapsed time t from a time point when it receives the timing start command from the controller 16 .
- step S 4 the controller 16 acquires a rotation speed R y of the fan 18 when the elapsed time t timed by the timer 22 reaches a predetermined time.
- the predetermined time is pre-stored in the storage 24 .
- the predetermined time is set to the above-mentioned time period t 1 ⁇ 2 .
- the predetermined time is set to above-mentioned the time period t 4 ⁇ 5 .
- step S 4 when the predetermined time (e.g., time period t 1 ⁇ 2 or t 4 ⁇ 5 ) has elapsed from a time point (e.g., time point t 1 in FIG. 4 or time point t 4 in FIG. 5 ) when the controller 16 has sent the rotation speed changing command to the fan 18 at step S 1 , the controller 16 sends a command to the rotation speed detecting part 19 , similar to step S 2 , so as to acquire the rotation speed R y of the fan 18 at this time.
- a time point e.g., time point t 1 in FIG. 4 or time point t 4 in FIG. 5
- the controller 16 acquires a relationship between time t and rotation speed R (i.e., t ⁇ R relationship).
- the controller 16 calculates a gradient ⁇ R/ ⁇ t (corresponding to e.g. (R 2 ⁇ R 1 ) /t 1 ⁇ 2 or (R 6 ⁇ R 4 )/t 4 ⁇ 5 described above) as a parameter representing the t ⁇ R relationship.
- the controller 16 functions as a relationship acquiring part 44 ( FIG. 2 ) which acquires a relationship (i.e., t ⁇ R relationship) between the time t from the time point t 1 (t 1 ⁇ 2 or t 4 ⁇ 5 ), at which the rotation speed R of the fan 18 is changed, and the rotation speed R of the fan 18 .
- a relationship i.e., t ⁇ R relationship
- the controller 16 determines that the t ⁇ R relationship of the fan 18 is different from the standard ⁇ R ref (i.e., determines “YES”).
- the controller 16 compares the ratio R with a predetermined threshold value ⁇ 2 which is pre-set with respect to the ratio R.
- the controller 16 determines that the t ⁇ R relationship of the fan 18 is different from the standard ⁇ R ref (i.e., determines “YES”).
- the controller 16 compares the absolute value of the gradient
- the controller 16 determines whether the absolute value of gradient
- is greater than the threshold value ⁇ 3 (e.g., ⁇ 3
- the controller 16 determines whether the absolute value of gradient
- is smaller than the threshold value ⁇ 3 (e.g., ⁇ 3
- the controller 16 determines that the t ⁇ R relationship ( ⁇ R/ ⁇ t) of the fan 18 is different from the standard ⁇ R ref / ⁇ t (i.e., determines “YES”). Note that, the above-mentioned threshold value ⁇ 1 , ⁇ 2 , or ⁇ 3 is pre-stored in the storage 24 .
- step S 6 When the controller 16 determines “YES” at this step S 6 , the controller 16 proceeds to step S 7 . On the other hand, when the controller 16 determines that the t ⁇ R relationship is not different from the standard (i.e., determines “NO”), the controller 16 ends the flow shown in FIG. 6 .
- the controller 16 functions as a malfunction determining part 46 ( FIG. 2 ) which determines whether the t ⁇ R relationship of the fan 18 is different from the standard.
- the controller 16 generates a malfunction notifying signal indicating that a malfunction occurs in the fan 18 .
- the controller 16 generates the malfunction notifying signal in the form of a sound signal of an alarm to be output to a user.
- the controller 16 generates the malfunction notifying signal in the form of an image signal of an alarm visible to a user.
- the controller 16 functions as a malfunction signal generating part 48 ( FIG. 2 ) which generates the malfunction notifying signal.
- the controller 16 notifies a user of the occurrence of a malfunction in the fan 18 via the alarm output part 20 .
- the controller 16 sends the sound signal to the alarm output part 20 .
- the alarm output part 20 includes a speaker to output the received sound signal as an alarm sound.
- the controller 16 sends the image signal to the alarm output part 20 .
- the alarm output part 20 includes a display part to display the alarm image corresponding to the received image signal.
- the user can recognize the occurrence of a malfunction in the fan 18 from the alarm sound or the alarm image. Consequently, the user can recognize that it is necessary to carry out maintenance for removing foreign substances attached to the rotator 28 of the fan 18 .
- the relationship between rotation speed R and time t when the rotation speed R of the fan 18 is changed i.e., the amount of change in the rotation speed R over time
- the relationship between rotation speed R and time t when the rotation speed R of the fan 18 is changed is compared with the relationship of the normal product as a standard, so as to determine whether the rotation speed R of the fan 18 is equal to that of the normal product.
- a malfunction in the rotation speed R of the fan 18 can be more accurately detected, and therefore it is possible to reliably avoid erroneously detecting a malfunction in the fan 18 , and thereby avoid unnecessarily stopping the operation of the motor drive device 10 . As a result, it is possible to improve the efficiency of operation.
- step S 11 the controller 16 starts to measure the rotation speed R of the fan 18 .
- the controller 16 sends a command to the rotation speed detecting part 19 so as to periodically detect the rotation speed R of the rotator 28 of the fan 18 at a period ⁇ (e.g., 0.5 sec.).
- the controller 16 receives data of the rotation speed R from the rotation speed detecting part 19 at the period ⁇ , and stores them in the storage 24 .
- step S 12 the controller 16 determines whether the rotation speed R of the fan 18 detected at step S 11 reaches a predetermined target value R t .
- the target value R t is set to the rotation speed R 1 .
- the target value R t is set to the rotation speed R 5 .
- step S 12 determines that the rotation speed R detected at step Sll reaches the target value R t (i.e., determined “YES”), it proceeds to step S 13 .
- the controller 16 determines that the rotation speed R does not reach the target value R t (i.e., determines “NO”), it repeats step S 12 .
- the controller 16 functions as the relationship acquiring part 44 ( FIG. 2 ) so as to acquire the relationship between time t and rotation speed R (i.e., the t ⁇ R relationship). Specifically, the controller 16 acquires, as a parameter representing the t ⁇ R relationship, the elapsed time t timed by the timer 22 at the time point when it is determined “YES” at step S 12 , and stores it in the storage 24 .
- the elapsed time t timed at this time point corresponds to the time period (t 1 ⁇ 2 ) from the time point (t 1 ) when the controller 16 sends the rotation speed changing command at step S 1 to the time point (t 2 ) when the rotation speed R reaches R 1 .
- the elapsed time t timed at this time point corresponds to the time period (t 4 ⁇ 6 ) from the time point (t 4 ) when the controller 16 sends the rotation speed changing command at step S 1 to the time point (t 6 ) when the rotation speed R reaches R 5 .
- the controller 16 functions as the malfunction determining part 46 ( FIG. 2 ) so as to determine whether the t ⁇ R relationship acquired at step S 13 is different from a predetermined standard.
- the threshold value ⁇ 4 is pre-stored in the storage 24 .
- the controller 16 determines that the t ⁇ R relationship of the fan 18 is different from the standard (time period t 1 ⁇ 3 or time period t 4 ⁇ 5 ) (i.e., determines “YES”).
- step S 7 the controller 16 proceeds to step S 7 when it determines “YES”.
- the controller 16 ends the flow shown in FIG. 7 when it determines that the t ⁇ R relationship is not different from the standard (i.e., determines “NO”).
- a malfunction in the rotation speed R of the fan 18 can be accurately detected, similar to the flow in FIG. 6 . Therefore, it is possible to avoid erroneously detecting a malfunction in the fan 18 , and thereby avoid unnecessarily stopping the operation of the motor drive device 10 . As a result, it is possible to improve the efficiency of operation.
- At least one of the timer 22 and the storage 24 may be incorporated in the controller 16 , or in an external device (e.g., server) communicably connected to the controller 16 via a network.
- an external device e.g., server
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- Business, Economics & Management (AREA)
- Emergency Management (AREA)
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- General Physics & Mathematics (AREA)
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Abstract
Description
- 1. Field of the Invention
- The invention relates to a motor drive device capable of informing a user of a malfunction in the operation of a fan, and a method thereof.
- 2. Description of the Related Art
- A device capable of detecting a malfunction in the rotation speed of a fan has been known (see, for example, Japanese Unexamined Patent Publication (Kokai) No. 10-28394).
- In a motor drive device for driving a servomotor embedded in a machine tool or an industrial robot, a control scheme for stopping the operation of the motor drive device when a malfunction in a fan is detected is used in some cases.
- In this instance, detection of malfunction in the fan directly results in stopping of the operation process. Thus, in the field of motor driving motors, in terms of improving working efficiency, early detection of a warning sign of malfunction in a fan has been required.
- In an aspect of the invention, a motor drive device includes a fan, a fan controller which controls the fan, a rotation speed detecting part which detects the rotation speed of the fan, and a relationship acquiring part which acquires a relationship between a time elapsed from a time point, at which the fan controller changes the rotation speed, and the rotation speed detected by the rotation speed detecting part.
- The motor drive device includes a malfunction determining part which determines whether the relationship acquired by the relationship acquiring part is different from a predetermined standard, and a malfunction signal generating part which generates a signal indicating that a malfunction occurs in the fan when the malfunction determining part determines that the relationship is different from the standard.
- The relationship acquiring part may acquire, as the relationship, an amount of change in the rotation speed detected by the rotation speed detecting part within a time period until a predetermined time elapses from the time point at which the fan controller sends to the fan a command for changing the rotation speed. The malfunction determining part may determine that the relationship is different from the standard when the acquired amount of change is greater or smaller than a predetermined threshold value.
- The relationship acquiring part may calculate, as the relationship, a ratio of an amount of change in the rotation speed detected by the rotation speed detecting part within a time period until a predetermined time elapses from the time point at which the fan controller sends to the fan a command for changing the rotation speed, to the standard. The malfunction determining part may determine that the relationship is different from the standard when the ratio is greater or smaller than a predetermined threshold value.
- The relationship acquiring part may acquire, as the relationship, a time until the rotation speed detected by the rotation speed detecting part changes from a first rotation speed to a second rotation speed different from the first rotation speed when the fan controller sends to the fan a command for changing the rotation speed from the first rotation speed to the second rotation speed.
- The malfunction determining part may determine that the relationship is different from the standard when the acquired time is greater or smaller than a predetermined threshold value. The motor drive device may further include a timer which measures a time from a time point at which the fan controller changes the rotation speed.
- The motor drive device may further include a storage which stores the rotation speed detected by the rotation speed detecting part or the time from the time point at which the fan controller changes the rotation speed. The motor drive device may further include an alarm output part which receives the signal and outputs an alarm to a user.
- In another aspect of the invention, a method of notifying a user of an occurrence of a malfunction in a fan provided at a motor drive device comprises changing a rotation speed of the fan, and detecting the rotation speed when changing the rotation speed.
- The method comprises acquiring a relationship between a time elapsed from a time point, at which the rotation speed is changed, and the detected rotation speed, determining whether the acquired relationship is different from a predetermined standard, and notifying to a user that a malfunction occurs in the fan when determining that the relationship is different from the standard.
- The above-mentioned or other objects, features, and advantages of the invention will be clarified by the detailed description of embodiments with reference to accompanying drawings, in which:
-
FIG. 1 is a perspective view of a motor drive device according to an embodiment of the invention; -
FIG. 2 is a block diagram of the motor drive device shown inFIG. 1 ; -
FIG. 3 is a front view of the fan shown inFIG. 2 ; -
FIG. 4 is a graph representing a relationship between the rotation speed of the fan and time when the rotation speed is decreased; -
FIG. 5 is a graph representing a relationship between the rotation speed of the fan and time when the rotation speed is increased; -
FIG. 6 is a flowchart of an example of the operation flow of the motor drive device shown inFIG. 1 ; and -
FIG. 7 is a flowchart of another example of the operation flow of the motor drive device shown inFIG. 1 . - Embodiments of the invention will be described below in detail with reference to the drawings. First, with reference to
FIGS. 1 to 3 , amotor drive device 10 according to an embodiment of the invention will be described. Themotor drive device 10 supplies electric power to a servomotor (not shown) built in e.g. a machine tool or industrial robot in order to drive the servomotor. - As shown in
FIG. 1 , themotor drive device 10 includes ahousing 12. Thehousing 12 is e.g. a box-shaped member made of resin, and houses therein components including acontroller 16 described later. A through-hole 14 is formed at thehousing 12. - As shown in
FIG. 2 , themotor drive device 10 further includes thecontroller 16, afan 18, a rotationspeed detecting part 19, analarm output part 20, atimer 22, and astorage 24. Thecontroller 16 includes e.g. a CPU, and is housed in thehousing 12. Thecontroller 16 directly or indirectly controls each component of themotor drive device 10. - The
fan 18 is housed in thehousing 12 so as to face the through-hole 14 formed at thehousing 12. As shown inFIG. 3 , thefan 18 includes arotator 28 having a plurality ofvanes 26, and afan motor 30 which rotates therotator 28. - The
rotator 28 is arranged to be adjacent to the through-hole 14 formed at thehousing 12. Thefan motor 30 is connected to an inverter 32 (FIG. 2 ). Theinverter 32 supplies electric power to thefan motor 30 in accordance with a command from thecontroller 16. - The
fan motor 30 drives therotator 28 to rotate at the rotation speed corresponding to the electric power supplied from theinverter 32. When therotator 28 is rotated, an air in thehousing 12 is discharged to the outside through the through-hole 14, thereby themotor drive device 10 is cooled. - The rotation
speed detecting part 19 includes e.g. an encoder or Hall element, and is attached to thefan 18. The rotationspeed detecting part 19 detects the rotation speed of therotator 28 of thefan 18 in accordance with a command from thecontroller 16, and sends data of the detected rotation speed of thefan 18 to thecontroller 16. - The
alarm output part 20 includes e.g. a speaker or display part, and outputs a sound or image in accordance with a command from thecontroller 16. Thetimer 22 times an elapsed time from a given time point in accordance with a command from thecontroller 16. - The
storage 24 includes e.g. a non-volatile memory such as an EEPROM (registered trademark) which can electrically delete and record data, or a random access memory such as DRAM or SRAM which can rapidly read out and write on data. Thecontroller 16 can record data on, and delete data from thestorage 24. - As the
fan 18 is driven, foreign substances, such as dust or cutting fluid, etc., gradually accumulate on therotator 28 of thefan 18, thereby the rotation of therotator 28 can be disturbed. Themotor drive device 10 according to this embodiment detects such malfunction in thefan 18. - Below, with reference to
FIGS. 4 and 5 , the concept for detecting a malfunction of thefan 18 in themotor drive device 10 will be described.FIG. 4 is a graph showing the relationship between rotation speed R of thefan 18 and time t when thecontroller 16 sends a rotation speed changing command to thefan motor 30 at a time point t1 so as to reduces the rotation speed of thefan 18 from a rotation speed R2 to a rotation speed R1. - On the other hand,
FIG. 5 is a graph showing the relationship between rotation speed R of thefan 18 and time t when thecontroller 16 sends a rotation speed changing command to thefan motor 30 at a time point t4 so as to increase the rotation speed of thefan 18 from a rotation speed R4 to a rotation speed R5. - A
solid line 34 inFIG. 4 and asolid line 38 in -
FIG. 5 represent characteristics when thefan 18 normally operates (hereinafter, referred as a “normal product”). On the other hand, abroken line 36 inFIG. 4 and abroken line 40 inFIG. 5 represent characteristics when foreign substances attach to therotator 28 of thefan 18, thereby an operational malfunction occurs in the fan 18 (hereinafter, referred as a “malfunction product”). - As can been seen from
FIG. 4 , according to the normal product, when the rotation speed R is decreased, the rotation speed R reduces relatively moderately from the time point t1, and reaches the rotation speed R1 at a time point t3. On the other hand, according to the malfunction product, the rotation speed R decreases from the time point t1 more sharply than in the normal product, and reaches the rotation speed R1 at a time point t2 (<t3). - Thus, a remarkable difference is made between the relationship between time t and rotation speed R (hereinafter, the “t−R relationship”) of the normal product after the time point t1, and the t−R relationship after the time point t1 of the malfunction product. This is caused by the fact that the rotation of the
rotator 28 in the malfunction product is disturbed by the foreign substances attached thereto. - The
motor drive device 10 according to this embodiment detects a malfunction in thefan 18 by making use of the above-mentioned difference between the t−R relationships of the normal product and the malfunction product. The t−R relationship in thefan 18 can be evaluated by various parameters described below. - As an example, in
FIG. 4 , an amount of change δRref in the rotation speed R of the normal product within a time period t1−2(=t2−t1) is δRref ≈R2−R3. On the other hand, an amount of change δR in the rotation speed R of the malfunction product within the time period t1−2 is δR≈R2−R1. As can been seen fromFIG. 4 , the amount of change δR in the malfunction product is remarkably larger than the amount of change δRref in the normal product. - Thus, a malfunction in the operating
fan 18 can be detected by acquiring the amount of change δR as a parameter representing the t−R relationship of thefan 18, and comparing it with the δRref in the normal product, which is to be used as a standard. - As another example, a malfunction in the operating
fan 18 can be detected by calculating, as a parameter representing the t−R relationship in thefan 18, a ratio R of the amount of change δR to the standard δRref, i.e., R=δR/δRref≈(R2−R1)/(R2−R3) , and comparing the ratio R with a predetermined threshold value. - As still another example, a time period t1−3(=t3−t1) is necessary in the normal product until the rotation speed R changes from R2 to R1, whereas a time period t1−2(=t2−t1) is necessary in the malfunction product until the rotation speed R changes from R2 to R1. As seen from
FIG. 4 , the time period t1−2 in the malfunction product is remarkably smaller than the time period t1−3 in the normal product. - Accordingly, a malfunction in the operating
fan 18 can be detected by obtaining the time period t1−2 as a parameter representing the t−R relationship in thefan 18, and comparing it with the time period t1−3 in the normal product, which is to be used as a standard. - As still another example, a malfunction in the operating
fan 18 can be detected by acquiring, as a parameter representing the t−R relationship in thefan 18, a gradient δR/δt of the rotation speed R (i.e., acceleration) in the time period t1−2, i.e., δR/δt=(R2−R1)/t1−2, and comparing it with a gradient in the normal product, i.e., δRref/δt=(R2−R3)/t1−2, which is to be used as a standard. - Referring to
FIG. 5 , according to the normal product, when the rotation speed R increases, the rotation speed R increases relatively sharply from the time point t4, and reaches the rotation speed R5 at a time point t5. On the other hand, according to the malfunction product, the rotation speed R increases from the time point t4 more moderately than in the characteristic of the normal product, and reaches the rotation speed R5 at a time point t6. - Thus, when the rotation speed R increases, a remarkable difference is made between the t−R relationship in the normal product and the t−R relationship in the malfunction product, after the time point t4. Accordingly, a malfunction in the
fan 18 to be inspected can be detected by making use of such a difference in the t−R relationship between the normal product and the malfunction product. - As an example, in
FIG. 5 , the amount of change δRref in the rotation speed R of the normal product within the time period t4−5 from the time point t4 to the time point t5 (i.e., t4−5=t5−t4) is δRref=R5−R4. On the other hand, the amount of change δR in the rotation speed R of the malfunction product within the time period t4−5 is δR=R6−R4. As seen fromFIG. 5 , the amount of change δR of the malfunction product is remarkably smaller than the amount of change δRref of the normal product. - Accordingly, a malfunction in the operating
fan 18 can be detected by acquiring the amount of change δR as a parameter representing the t−R relationship of the operatingfan 18, and comparing it with the δRref of the normal product, which is to be used as a standard. - In another example, a malfunction of the operating
fan 18 can be detected by calculating, as a parameter representing the t−R relationship of the operatingfan 18, a ratio R of the amount of change δR to the standard δRref, i.e., R=δR/δRref=(R6−R4)/(R5−R4), and comparing the ratio R with a predetermined threshold value. - In still another example, referring to
FIG. 5 , a time period t4−5(=t5−t4) is necessary in the normal product until the rotation speed R changes from R4 to R5, whereas a time period t4−6(=t6−t4) is necessary in the malfunction product until the rotation speed R changes from R4 to R5. As can been seen fromFIG. 5 , the time period t4−6 of the malfunction product is remarkably greater than the time period t4−5 of the normal product. - Thus, a malfunction in the operating
fan 18 can be detected by acquiring the time period t4−6 as a parameter representing the t−R relationship of the operatingfan 18, and comparing it with the time period t4−5 of the normal product, which is to be used as a standard. - In still another example, a malfunction in the operating
fan 18 can be detected by acquiring the gradient δR/δt of the rotation speed R within the time period t4−5, i.e., δR/δt=(R6−R4)/t4−5, as a parameter representing the t−R relationship of the operatingfan 18, and comparing it with the gradient δRref/δt of the normal product, i.e., δRref/δt=(R5−R4)/t4−5, which is to be used as a standard. - Thus, the
motor drive device 10 according to this embodiment detects whether a malfunction occurs in thefan 18, by making use of the various parameters (δR, t1−2, δR/δt, t4−6) and standards (δRref, t1−3, δRref/δt, t4−5). - Next, with reference to
FIG. 6 , an example of the operation flow of themotor drive device 10 will be described. The flow shown inFIG. 6 is started when thecontroller 16 receives from a user, host controller or control program a malfunction inspection command for inspecting an operational malfunction in thefan 18. - As an example, the
controller 16 receives the malfunction inspection command when it increases the rotation speed of thefan 18 from zero to a normal rotation speed (i.e., when the supply of electric power from theinverter 32 to thefan motor 30 is started) in order to normally operate thefan 18. - As another example, the
controller 16 receives the malfunction inspection command when it decreases the rotation speed of thefan 18 from the normal rotation speed to zero (i.e., when the supply of electric power from theinverter 32 to thefan motor 30 is stopped) in order to stop thefan 18 in normal operation. - As still another example, the
controller 16 receives the malfunction inspection command when the process is interrupted during the normal operation of thefan 18. Note that, the above-described normal rotation speed is pre-set as a required value for normally operating thefan 18. - At step S1, the
controller 16 changes the rotation speed of thefan 18. As an example, as shown inFIG. 4 , thecontroller 16 sends a rotation speed changing command to theinverter 32 so as to decrease the rotation speed R of thefan 18, which is rotating at the rotation speed R2 (e.g., the normal rotation speed), from the rotation speed R2 to the rotation speed R1 (e.g., zero). - As another example, as shown in
FIG. 5 , thecontroller 16 sends a rotation speed changing command to theinverter 32 so as to increase the rotation speed R of thefan 18, which is rotating at the rotation speed R4 (e.g., zero), from the rotation speed R4 to the rotation speed R5 (e.g., normal rotation speed). - The
inverter 32 controls electric power supplied to thefan motor 30 so as to change the rotation speed R of thefan 18 to a rotation speed (R1 or R5) in accordance with the rotation speed changing command received from thecontroller 16. Thus, in this embodiment, thecontroller 16 functions as a fan controller 42 (FIG. 2 ) which controls the operation of thefan 18. - At step S2, the
controller 16 acquires a rotation speed Rx of thefan 18. Specifically, thecontroller 16 sends a command to the rotationspeed detecting part 19 so as to detect the rotation speed Rx of therotator 28 of thefan 18 at this time. Thecontroller 16 receives data of the rotation speed Rx from the rotationspeed detecting part 19, and records it on thestorage 24. - As an example, when the rotation speed R is decreased from R2 to R1 at step S1 (
FIG. 4 ), the rotation speed Rx measured at step S2 substantially coincides with the rotation speed R2 at the time point t1 inFIG. 4 . - As another example, when the rotation speed R is increased from R4 to R5 at step S1 (
FIG. 5 ), the rotation speed Rx measured at step S2 substantially coincides with the rotation speed R4 at the time point t4 inFIG. 5 . - At step S3, the
controller 16 start to time an elapsed time. Specifically, thecontroller 16 sends a timing start command for starting to time an elapsed time to thetimer 22. Thetimer 22 times an elapsed time t from a time point when it receives the timing start command from thecontroller 16. - At step S4, the
controller 16 acquires a rotation speed Ry of thefan 18 when the elapsed time t timed by thetimer 22 reaches a predetermined time. The predetermined time is pre-stored in thestorage 24. - As an example, when the rotation speed R is decreased from R2 to R1 at step S1 (
FIG. 4 ), the predetermined time is set to the above-mentioned time period t1−2. As another example, when the rotation speed R is increased from R4 to R5 at step S1 (FIG. 5 ), the predetermined time is set to above-mentioned the time period t4−5. - At this step S4, when the predetermined time (e.g., time period t1−2 or t4−5) has elapsed from a time point (e.g., time point t1 in
FIG. 4 or time point t4 inFIG. 5 ) when thecontroller 16 has sent the rotation speed changing command to thefan 18 at step S1, thecontroller 16 sends a command to the rotationspeed detecting part 19, similar to step S2, so as to acquire the rotation speed Ry of thefan 18 at this time. - At step S5, the
controller 16 acquires a relationship between time t and rotation speed R (i.e., t−R relationship). As an example, thecontroller 16 calculates, as a parameter representing the t−R relationship, an amount of change δRxy=|Rx−Ry|(this value corresponds to the above-mentioned δR) from the rotation speed Rx, acquired at step S2 to the rotation speed Ry acquired at step S4. - As another example, the
controller 16 calculates a ratio R=δRxy/δRref as a parameter representing the t−R relationship. As still another example, thecontroller 16 calculates a gradient δR/δt (corresponding to e.g. (R2−R1) /t1−2 or (R6−R4)/t4−5 described above) as a parameter representing the t−R relationship. - Thus, in this embodiment, the
controller 16 functions as a relationship acquiring part 44 (FIG. 2 ) which acquires a relationship (i.e., t−R relationship) between the time t from the time point t1 (t1−2 or t4−5), at which the rotation speed R of thefan 18 is changed, and the rotation speed R of thefan 18. - At step S6, the
controller 16 determines whether the t−R relationship acquired at step S5 is different from a predetermined standard. As an example, when the amount of change δRxy=|Rx−Ry is calculated at step S5, thecontroller 16 compares the calculated amount of change δRxy with a threshold value αl which is set with respect to the standard δRref. - For example, when the rotation speed R is decreased from R2 to R1 at step S1 (
FIG. 4 ), thecontroller 16 determines whether the amount of change δRxy is greater than the threshold value α1 (e.g., α1=δRref×1.1) . - On the other hand, when the rotation speed R is increased from R4 to R5 at step S1 (
FIG. 5 ), thecontroller 16 determines whether the amount of change δRxy is smaller than the threshold value α1 (e.g., α1=δRref×0.9). - When the amount of change δRxy is greater (or smaller) than the threshold value α1, the
controller 16 determines that the t−R relationship of thefan 18 is different from the standard δRref (i.e., determines “YES”). - As another example, when the ratio R is calculated at step S5, the
controller 16 compares the ratio R with a predetermined threshold value α2 which is pre-set with respect to the ratio R. - For example, when the rotation speed R is decreased from R2 to R1 at step S1 (
FIG. 4 ), thecontroller 16 determines whether the calculated ratio R is greater than the threshold value α2 (e.g., α2=1.1). On the other hand, when the rotation speed R is increased from R4 to R5 at step S1 (FIG. 5 ), thecontroller 16 determines whether the calculated ratio R is smaller than the threshold value α2 (e.g., α2=0.9). - When the ratio R is greater (or smaller) than the threshold value α2 the
controller 16 determines that the t−R relationship of thefan 18 is different from the standard δRref (i.e., determines “YES”). - As still another example, when the gradient δR/δt is calculated at step S5, the
controller 16 compares the absolute value of the gradient |δR/δt|, with a threshold value α3 which is set with respect to the standard δRref/δt . - For example, when the rotation speed R is decreased from R2 to R1 at step S1 (
FIG. 4 ), thecontroller 16 determines whether the absolute value of gradient |δR/δt| is greater than the threshold value α3 (e.g., α3=|δRref/δt|×1.1). - On the other hand, when the rotation speed R is increased from R4 to R5 at step S1 (
FIG. 5 ), thecontroller 16 determines whether the absolute value of gradient |δR/δt| is smaller than the threshold value α3 (e.g., α3=|δRref/δt|×0.9). - When the absolute value of gradient |δR/δt| is greater (or smaller) than the threshold value α3, the
controller 16 determines that the t−R relationship (δR/δt) of thefan 18 is different from the standard δRref/δt (i.e., determines “YES”). Note that, the above-mentioned threshold value α1, α2, or α3 is pre-stored in thestorage 24. - When the
controller 16 determines “YES” at this step S6, thecontroller 16 proceeds to step S7. On the other hand, when thecontroller 16 determines that the t−R relationship is not different from the standard (i.e., determines “NO”), thecontroller 16 ends the flow shown inFIG. 6 . - Thus, in this embodiment, the
controller 16 functions as a malfunction determining part 46 (FIG. 2 ) which determines whether the t−R relationship of thefan 18 is different from the standard. - At step S7, the
controller 16 generates a malfunction notifying signal indicating that a malfunction occurs in thefan 18. As an example, thecontroller 16 generates the malfunction notifying signal in the form of a sound signal of an alarm to be output to a user. - As another example, the
controller 16 generates the malfunction notifying signal in the form of an image signal of an alarm visible to a user. Thus, in this embodiment, thecontroller 16 functions as a malfunction signal generating part 48 (FIG. 2 ) which generates the malfunction notifying signal. - At step S8, the
controller 16 notifies a user of the occurrence of a malfunction in thefan 18 via thealarm output part 20. As an example, when the sound signal of an alarm is generated at step S7, thecontroller 16 sends the sound signal to thealarm output part 20. In this case, thealarm output part 20 includes a speaker to output the received sound signal as an alarm sound. - As another example, when the image signal of an alarm is generated at step S7, the
controller 16 sends the image signal to thealarm output part 20. In this case, thealarm output part 20 includes a display part to display the alarm image corresponding to the received image signal. - In this way, the user can recognize the occurrence of a malfunction in the
fan 18 from the alarm sound or the alarm image. Consequently, the user can recognize that it is necessary to carry out maintenance for removing foreign substances attached to therotator 28 of thefan 18. - As described above, in this embodiment, the relationship between rotation speed R and time t when the rotation speed R of the
fan 18 is changed (i.e., the amount of change in the rotation speed R over time) is compared with the relationship of the normal product as a standard, so as to determine whether the rotation speed R of thefan 18 is equal to that of the normal product. - According to this configuration, a malfunction in the rotation speed R of the
fan 18 can be more accurately detected, and therefore it is possible to reliably avoid erroneously detecting a malfunction in thefan 18, and thereby avoid unnecessarily stopping the operation of themotor drive device 10. As a result, it is possible to improve the efficiency of operation. - Next, with reference to
FIG. 7 , another example of the operation flow of themotor drive device 10 will be described. Note that, in the operation flow shown inFIG. 7 , steps similar to those inFIG. 6 are assigned the same numeral references, and the detailed description thereof will be omitted. - After step S1, at step S11, the
controller 16 starts to measure the rotation speed R of thefan 18. Specifically, thecontroller 16 sends a command to the rotationspeed detecting part 19 so as to periodically detect the rotation speed R of therotator 28 of thefan 18 at a period τ(e.g., 0.5 sec.). Thecontroller 16 receives data of the rotation speed R from the rotationspeed detecting part 19 at the period τ, and stores them in thestorage 24. - At step S12, the
controller 16 determines whether the rotation speed R of thefan 18 detected at step S11 reaches a predetermined target value Rt. - As an example, when the rotation speed R is decreased from R2 to R1 at step S1 (
FIG. 4 ), the target value Rt is set to the rotation speed R1. As another example, when the rotation speed R is increased from R4 to R5 at step S1 (FIG. 5 ), the target value Rt is set to the rotation speed R5. - When the
controller 16 determines that the rotation speed R detected at step Sll reaches the target value Rt (i.e., determined “YES”), it proceeds to step S13. On the other hand, when thecontroller 16 determines that the rotation speed R does not reach the target value Rt (i.e., determines “NO”), it repeats step S12. - At step S13, the
controller 16 functions as the relationship acquiring part 44 (FIG. 2 ) so as to acquire the relationship between time t and rotation speed R (i.e., the t−R relationship). Specifically, thecontroller 16 acquires, as a parameter representing the t−R relationship, the elapsed time t timed by thetimer 22 at the time point when it is determined “YES” at step S12, and stores it in thestorage 24. - For example, when the rotation speed R is decreased from R2 to R1 at step S1 (
FIG. 4 ), the elapsed time t timed at this time point corresponds to the time period (t1−2) from the time point (t1) when thecontroller 16 sends the rotation speed changing command at step S1 to the time point (t2) when the rotation speed R reaches R1. - On the other hand, when the rotation speed R is increased from R4 to R5 at step S1 (
FIG. 5 ), the elapsed time t timed at this time point corresponds to the time period (t4−6) from the time point (t4) when thecontroller 16 sends the rotation speed changing command at step S1 to the time point (t6) when the rotation speed R reaches R5. - At step S14, the
controller 16 functions as the malfunction determining part 46 (FIG. 2 ) so as to determine whether the t−R relationship acquired at step S13 is different from a predetermined standard. - As an example, when the rotation speed R is decreased from R2 to R1 at step S1 (
FIG. 4 ), thecontroller 16 determines whether the elapsed time t (time period t1−2) acquired at step S13 is smaller than a threshold value α4 (e.g., α4=t1−3×0.9) set for the above-described standard (time period t1−3). - As another example, when the rotation speed R is increased from R4 to R5 at step S1 (
FIG. 5 ), thecontroller 16 determines whether the elapsed time t (time period t4−6) acquired at step S13 is greater than the threshold value α4 (e.g., α4=t4−5×1.1) set for the above-described standard (time period t4−5). The threshold value α4 is pre-stored in thestorage 24. When the elapsed time t is greater (or smaller) than the threshold value α4, thecontroller 16 determines that the t−R relationship of thefan 18 is different from the standard (time period t1−3 or time period t4−5) (i.e., determines “YES”). - The
controller 16 proceeds to step S7 when it determines “YES”. On the other hand, thecontroller 16 ends the flow shown inFIG. 7 when it determines that the t−R relationship is not different from the standard (i.e., determines “NO”). - Thus, according to the operation flow in
FIG. 7 , a malfunction in the rotation speed R of thefan 18 can be accurately detected, similar to the flow inFIG. 6 . Therefore, it is possible to avoid erroneously detecting a malfunction in thefan 18, and thereby avoid unnecessarily stopping the operation of themotor drive device 10. As a result, it is possible to improve the efficiency of operation. - Note that, at least one of the
timer 22 and thestorage 24 may be incorporated in thecontroller 16, or in an external device (e.g., server) communicably connected to thecontroller 16 via a network. - Although the invention has been described above through various embodiments, the embodiments do not limit the inventions according to the claims. Further, a configuration obtained by combining the features described in the embodiments of the invention can be included in the technical scope of the invention. However, all combinations of these features are not necessarily essential for solving means of the invention. Furthermore, it is obvious for a person skilled in the art that various modifications or improvements can be applied to the embodiments.
- Regarding the order of operations, such as actions, sequences, steps, processes, and stages, in the devices, systems, programs, and methods indicated in the claims, specification and drawings, it should be noted that the terms “before”, “prior to”, etc. are not explicitly described, and any order can be realized unless the output of a previous operation is used in the subsequent operation. Regarding the processing in the claims, specification, and drawings, even when the order of operations is described using the. terms “first”, “next”, “subsequently”, “then”, etc., for convenience, maintaining this order is not necessarily essential for working the inventions.
Claims (8)
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JP2015-201219 | 2015-10-09 | ||
JP2015201219A JP6312645B2 (en) | 2015-10-09 | 2015-10-09 | Motor driving apparatus capable of reporting abnormal operation of fan and method thereof |
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US20170102000A1 true US20170102000A1 (en) | 2017-04-13 |
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US15/284,910 Abandoned US20170102000A1 (en) | 2015-10-09 | 2016-10-04 | Motor drive device capable of informing malfunction in operation of fan, and method thereof |
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US (1) | US20170102000A1 (en) |
JP (1) | JP6312645B2 (en) |
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JP6469174B2 (en) | 2017-06-22 | 2019-02-13 | ファナック株式会社 | Electric motor control device, electric motor system, and electric motor control method |
TWI698586B (en) * | 2019-01-23 | 2020-07-11 | 旺玖科技股份有限公司 | Devic for real-time self diagnosis of a fan and the method using the same |
JP7294901B2 (en) * | 2019-06-12 | 2023-06-20 | ファナック株式会社 | FAN MOTOR, FAN MOTOR DRIVE AND COOLING DEVICE |
CN112360788B (en) * | 2020-10-15 | 2023-04-21 | 宁畅信息产业(北京)有限公司 | Fan stability testing method and device, computer equipment and storage medium |
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Also Published As
Publication number | Publication date |
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CN106887994A (en) | 2017-06-23 |
DE102016011810A1 (en) | 2017-04-13 |
JP2017073943A (en) | 2017-04-13 |
JP6312645B2 (en) | 2018-04-18 |
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