WO2020101033A1 - Procédé d'évaluation de surcharge d'un moteur électrique bobiné, et procédé de fabrication de bobineur - Google Patents

Procédé d'évaluation de surcharge d'un moteur électrique bobiné, et procédé de fabrication de bobineur Download PDF

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Publication number
WO2020101033A1
WO2020101033A1 PCT/JP2019/044967 JP2019044967W WO2020101033A1 WO 2020101033 A1 WO2020101033 A1 WO 2020101033A1 JP 2019044967 W JP2019044967 W JP 2019044967W WO 2020101033 A1 WO2020101033 A1 WO 2020101033A1
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Prior art keywords
overload
determination threshold
overload determination
curve
input voltage
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PCT/JP2019/044967
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English (en)
Japanese (ja)
Inventor
勇作 井戸
正 山野
択真 一色
愉 戸部
Original Assignee
株式会社キトー
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Priority to JP2020556202A priority Critical patent/JP7253307B2/ja
Priority to CN201980071085.3A priority patent/CN112955400B/zh
Publication of WO2020101033A1 publication Critical patent/WO2020101033A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D1/00—Rope, cable, or chain winding mechanisms; Capstans
    • B66D1/54—Safety gear
    • B66D1/58—Safety gear responsive to excess of load
    • 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
    • G01R31/34—Testing dynamo-electric machines
    • 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
    • H02P29/02—Providing protection against overload without automatic interruption of supply

Definitions

  • the present invention relates to a hoisting motor overload determination method and a hoisting machine manufacturing method.
  • the hoisting machine is equipped with an overload limiter, which is a safety device to prevent accidents due to overload and damage to the motor (hoisting electric motor).
  • the OLL includes a mechanical OLL that stops winding when a clutch slips due to a predetermined overload, and an electronic OLL that detects overload from the value of a motor current and electrically stops winding.
  • the electronic OLL is required to reliably perform the hoisting operation up to 1.1 times the rated load (W), and to stop the hoisting operation up to 1.25 times the rated load. Therefore, it is important to detect an overload based on the motor current value to determine whether or not the electronic OLL needs to be operated.
  • the overload threshold value for stopping the hoisting operation is initialized. A pre-shipment inspection is performed in order to do so. At that time, it may be necessary to adjust the setting of the overload threshold due to the individual difference of the hoisting machine.
  • the customer who rents or purchases the hoist wants to change the initially set overload threshold to a safer direction, or the power supply situation at the hoist installation location (voltage drop due to power distribution, etc.) Depending on the situation, it may be desired to change the overload threshold.
  • Patent Document 1 Conventionally, there is an invention disclosed in Patent Document 1, for example, for overload detection of a hoisting motor.
  • the present invention detects the overload by approximating the power supply voltage-input power characteristic of the hoisting electric motor (motor) with a straight line, and is extremely excellent in that the overload can be easily detected with a certain degree of accuracy.
  • the present invention is capable of performing overload determination with good determination accuracy, and continues to provide an overload determination method for a hoisting motor and a method for manufacturing a hoisting machine that have good determination accuracy even if the overload threshold is changed. To aim.
  • an overload determining method for determining an overload of a hoisting motor is A step of measuring the relationship between the input voltage and the current by applying a reference overload to the reference winding motor, B step of deriving a reference overload determination threshold curve as a reference threshold for overload determination, which is based on the measured value and comprises a reference function that defines a current (i) by a quadratic expression of the input voltage (v); , C step of determining whether to change the reference overload determination threshold curve, When not changing the reference overload determination threshold curve, to determine the overload of the target hoisting motor based on the reference overload determination threshold curve, when changing the reference overload determination threshold curve, D step of determining an overload of the target hoisting motor based on a corrected overload determination threshold curve formed by a quadratic equation in which the intercept of the reference function is corrected, It is characterized by including.
  • the coefficient and the intercept of the reference function are corrected based on the difference between the current values at the input voltages of the first load curve and the second load curve.
  • the first load curve is at the input voltage of the reference hoisting motor in the first load set to the lower limit load that guarantees the hoisting operation of the reference hoisting motor measured in the step A.
  • the second load curve is at the input voltage of the reference hoisting motor at the second load set to the lower limit load that guarantees hoisting stop of the reference hoisting motor measured in the step A. Calculated based on the measured current value, Preferably.
  • the input voltage region for determining the overload is divided into a low voltage side input voltage region and a high voltage side input voltage region having a higher voltage than the low voltage side input voltage region, In the low voltage side input voltage region, overload is determined by a method including the A step, the B step, the C step and the D step, In the high voltage side input voltage region, The A step, Based on the measured value of the current, instead of the reference overload determination threshold curve, as a reference threshold for overload determination, which comprises a reference function that defines the current (i) by a linear expression of the input voltage (v).
  • B2 step of deriving a reference overload threshold line C2 step of determining whether to change the reference overload determination threshold line, When not changing the reference overload determination threshold straight line, determine the overload of the target hoisting motor based on the reference overload determination threshold straight line, when changing the reference overload determination threshold straight line, A D2 step of determining an overload of the target hoisting motor based on a corrected overload determination threshold line obtained by correcting the reference overload determination threshold line; It is preferable to include.
  • a hoisting machine manufacturing method comprising a hoisting motor and a microcomputer, the microcomputer having a function of determining an overload of the hoisting motor, Reference overload in which the current (i) is defined by a quadratic expression of the input voltage (v) based on the measured value of the relationship between the input voltage and the current, in which various loads are applied to the reference hoisting motor.
  • a determination threshold curve the step of deriving the function of deriving the reference overload determination threshold curve as a reference threshold for overload determination, a mounting step of mounting in a microcomputer, C step of determining whether to change the reference overload determination threshold curve,
  • the reference overload determination threshold curve is changed, the reference overload determination threshold curve is changed to a corrected overload determination threshold curve formed by a quadratic equation in which the intercept of the reference function is corrected, and the microcomputer is changed.
  • Change step to implement It is characterized by including.
  • the corrected overload determination threshold curve in the changing step is based on the difference between the current values at the respective input voltages of the first load curve and the second load curve, and is obtained by correcting the coefficient and the intercept of the reference function,
  • the first load curve is set to a lower limit load that applies various loads to the reference hoisting motor, measures the relationship between input voltage and current, and guarantees the hoisting operation of the reference hoisting motor.
  • the second load curve sets various loads to the reference hoisting motor, measures the relationship between the input voltage and the current, and sets the lower limit load that guarantees hoisting stop of the reference hoisting motor.
  • the load is calculated based on the measured value of the current at the input voltage of the reference winding motor, Preferably.
  • the mounting step has a low voltage side mounting step and a high voltage side mounting step
  • the function of deriving the reference overload determination threshold curve is mounted on a microcomputer
  • the high voltage side mounting step a reference overload in which the current (i) is defined by a linear expression of the input voltage (v) is on the high voltage side in the input voltage region for determining the overload, as compared with the low voltage side mounting step.
  • the changing step includes a low voltage side changing step and a high voltage side changing step
  • the low voltage side changing step the reference overload determination threshold curve is changed to the corrected overload determination threshold curve and mounted on the microcomputer
  • the high voltage side changing step in the input voltage region for determining the overload is higher than the low voltage side changing step, the reference overload determination threshold curve is corrected, and the reference overload determination threshold straight line is corrected.
  • Corrected overload determination threshold value is changed to a straight line and mounted on the microcomputer, Preferably.
  • FIG. 3 is a diagram for explaining the overload determination method according to the first embodiment, and is a diagram illustrating a hardware configuration of an overload determination device (hoisting machine) for a hoisting motor.
  • FIG. 3 is a diagram for explaining the overload determination method according to the first embodiment, and is a diagram showing functional blocks of an overload determination device for a hoisting motor.
  • FIG. 6 is a diagram for explaining the overload determination method according to the first embodiment, and is a diagram showing reference overload determination threshold curves for various loads.
  • FIG. 6 is a diagram for explaining a processing flow of an overload determination method according to the first embodiment.
  • FIG. 6 is a diagram for explaining the overload determination method according to the first embodiment, and is an explanatory diagram for deriving a reference overload determination threshold curve.
  • FIG. 1 is a diagram for explaining the overload determination method according to the first embodiment, and is a diagram illustrating a hardware configuration of an overload determination device (hoisting machine) for a hoisting motor.
  • FIG. 3 is
  • FIG. 6 is a diagram for explaining the overload determination method according to the first embodiment, and is a diagram for explaining a flow for deriving a reference overload determination threshold curve.
  • FIG. 6 is a diagram for explaining the overload determination method according to the first embodiment, and is an explanatory diagram regarding a change in a reference overload determination threshold curve.
  • FIG. 6 is a diagram for explaining the overload determination method according to the first embodiment, and is a diagram for explaining a processing flow relating to a change in a reference overload determination threshold curve.
  • FIG. 6 is a diagram for explaining the overload determination method according to the first embodiment, and is an explanatory diagram regarding a corrected overload determination threshold curve.
  • FIG. 9 is a diagram for explaining a processing flow of an overload determination method according to the second embodiment.
  • FIG. 9 is a diagram for explaining an overload determination method according to the second embodiment.
  • FIG. 9 is a diagram for explaining an overload determination method according to a third embodiment.
  • FIG. 1 to 9 are diagrams for explaining an overload determination method for the hoisting electric motor 22 according to the first embodiment.
  • FIG. 1 is a diagram showing a hardware configuration of an overload determination device 24 (hoisting machine 21) of a hoisting motor 22 used in the overload determination method according to the first embodiment.
  • the hoisting electric motor 22 means a motor in a state of being assembled with the hoisting machine 21.
  • the “overload” refers to a load which the hoisting electric motor 22 is more than an allowable load. Which load is to be overloaded is not necessarily uniquely determined, and is determined by the manufacturer or user of the hoisting motor 22 (hoisting machine 21) after comprehensively judging safety and usability. .
  • load 0000% may be referred to as “load XX%” or “overload XX%” as it is.
  • the “load” is a force for turning the shaft (shaft) of the hoisting motor 22 or a force for stopping the rotation of the shaft, and is mainly a load.
  • the rated load (W) is 100% load, and 1.1 times the rated load (W) is 110% load.
  • the hoisting machine 21 is an electric chain block.
  • the hoisting machine 21 includes a hoisting electric motor (motor) 22, and axially rotates a load sheave connected to the hoisting electric motor 22 via a reduction mechanism to wind a chain and hoist a load 51 such as a suspended load.
  • the hoisting machine 21 may be a rope hoist or a winch that winds a wire rope by rotating a drum.
  • the hoisting machine 21 includes an operating switch 25 for operating hoisting and hoisting of the hoisting motor 22, an overload determination device 24 for determining whether the load 51 is overloaded, and a braking device for braking the hoisting motor 22. 26 is provided.
  • the braking device 26 is, for example, a pull rotor brake that applies a brake when power supply to the hoisting electric motor 22 is cut off by opening and closing an electric path between the power source 52 and the hoisting electric motor 22.
  • the operation switch 25 is a push button switch.
  • the hoist button switch When the hoist button switch is pressed, electric power is supplied from the power source 52 to the hoist electric motor 22 to hoist the load 51.
  • the hoisting switch When the hoisting switch is released, the power supply to the hoisting motor 22 is cut off and the hoisting is stopped.
  • the overload determination device 24 includes a CPU 29, a ROM 31, a memory 30, and a sensor 23.
  • the CPU 29 is incorporated in a microcomputer (microcomputer), and reads and executes a computer program (software) in which instructions (processing) for the CPU 29 are described.
  • the program is stored in the ROM 31 or the RAM 32 in advance.
  • the memory 30 includes a ROM 31 and a RAM 32.
  • the CPU 29, the ROM 31, the RAM 32, and the sensor 23 are connected by BUS to form a microcomputer (microcomputer).
  • FIG. 2 is a diagram for explaining the overload determination method according to the first embodiment, and is a diagram showing functional blocks of the overload determination device 24 of the hoisting motor 22.
  • the overload determination device 24 includes a sensor 23, a memory 30, an overload determination means 61, a reference overload determination threshold curve derivation means 62, a reference overload determination threshold curve change determination means 63, and a corrected overload determination threshold curve derivation means 64.
  • the sensor 23 detects an input voltage detector 53 that detects an input voltage of the hoisting machine 21 (hoisting electric motor 22) and a current that flows through the hoisting electric motor 22 with respect to the electric power supplied from the power supply 52 to the hoisting motor 21.
  • the current detector 54 is provided.
  • the "overload determining means” 61 is a microcomputer that reads a program and executes a function of determining an overload.
  • the “reference overload determination threshold curve deriving means” 62 is a microcomputer that reads a program and executes a function of deriving a reference overload determination threshold curve.
  • the “reference overload determination threshold curve change determination means” 63 is a microcomputer that executes a function of reading a program and determining whether to change the reference overload determination threshold curve.
  • the “correction overload determination threshold curve deriving means” 64 is a microcomputer that executes a function of reading a program and deriving a correction overload determination threshold curve.
  • the memory 30 stores the input voltage and current value of the hoisting motor 22 at a constant (over) load.
  • the braking device 26 includes braking command means 71 for issuing a braking command to the hoisting electric motor 22, and a braking mechanism 261 for receiving a braking command and braking.
  • FIG. 3 is a diagram for explaining the overload determination method according to the first embodiment, and is a diagram showing a reference overload determination threshold curve of the hoisting motor 22 that serves as a reference in the reference load. It is also a figure which shows the reference overload determination threshold value curve in the hoisting electric motor 22 which does. The same applies to the other figures.
  • the "reference hoisting electric motor” refers to “a hoisting electric motor that serves as a base for measurement and the like”.
  • the “target hoisting electric motor” refers to "a hoisting electric motor to be an object of overload determination”. For example, if there are multiple hoisting motors of the same model number, then an average or model hoisting motor is defined as the “reference hoisting motor”, and the relationship between the input voltage and the current is measured in advance. Find the characteristics of the hoisting motor.
  • the hoisting motor to be subjected to the overload determination in the pre-shipment inspection or the like by reflecting the measurement result is referred to as the “target hoisting motor”.
  • the hoisting motors 22 of the same type such as the hoisting motor 22 of the same model number, do not need to be individually measured, and the reference overload determination threshold curve 1 is derived based on the measurement of the hoisting motor 22 as a reference. Then, the overload of the target hoisting electric motor 22 may be determined.
  • the "hoisting electric motor 22" does not strictly separate the "reference hoisting electric motor” and the "target hoisting electric motor”.
  • the reference overload determination threshold curve 1 of FIG. 3 shows the relationship between the input voltage of the hoisting motor 22 and the current (value) flowing through the hoisting motor 22 at a predetermined load.
  • the horizontal axis represents the input voltage (v) and the vertical axis represents the current (i).
  • the input voltage in the usage range is 340V (volt) to 460V.
  • the input voltage in this range is the guaranteed range of use of the hoisting motor 22.
  • the rated voltage is 400V.
  • the curve indicated by reference numeral 1 is a curve showing the relationship between each input voltage (340V, 360V, 380V, 400V, 420V, 440V, 460V) and the current at a reference load of 117.5%.
  • the load 117.5% is set as a threshold, and the load 117.5% or more is overloaded.
  • the "threshold value” refers to the minimum value that causes an overload. It is also called a limit value or a critical value.
  • the threshold of 117.5% is taken into consideration between safety by taking an intermediate value between the load of 125% that strictly prohibits hoisting and should ensure safety and the load of 110% where winding is allowed. Because it was done.
  • the overload threshold at factory shipment is 117.5% load.
  • the load of 117.5% is a guideline for the threshold value, and the winding does not stop at a load of 110% or less, and it is sufficient if the winding stops at a load of 110% to 125%. It is not necessary to stop winding at a load of 0.5%.
  • FIG. 3 in addition to the load 117.5% (curve with reference numeral 1), the relationship between the input voltage and the current (actual measurement value) at load 100% and 125% is indicated by reference numeral 100 and reference numeral 125, respectively. It is shown by an overload judgment threshold curve. As can be seen from each curve, the increasing / decreasing trend of input voltage-current (motor characteristic) at each load can be read. Actually, the quadratic curve of the load 117.5% is obtained in advance, and the current values of at least the input voltages 340V, 400V and 460V at the loads 100% and 125% are measured and stored in the memory 30.
  • the load of 117.5% is used as the reference load in the present embodiment
  • the reference load (overload threshold) at the time of factory shipment is set to 115% of the load, for example, the load obtained in advance from the measured value is the same as the above.
  • a 115% quadratic curve is used as a reference overload determination threshold curve.
  • FIG. 4 is a diagram for explaining the processing flow of the overload determination method according to the first embodiment.
  • the overload determining method for determining the overload of the hoisting motor 22 of the first embodiment first, the reference load 51 (1.175 W (117.5%) in the present embodiment) is applied to the hoisting motor 22 as a reference. And the relationship between the input voltage and the current (value) is measured in advance (step S1, step A). The input voltage detector 53 and the current detector 54 measure the relationship between the input voltage and the current. The measurement result is stored in the memory 30. "Measurement" was performed by actual measurement. The measured value is an actual measured value.
  • the reference overload determination threshold curve deriving means 62 is based on the measured values stored in the memory 30, and is based on the measured value stored in the memory 30.
  • a reference overload determination threshold curve 1 (approximate curve) is derived as a reference threshold for (step S2, step B).
  • the “quadratic equation” refers to an equation in which the current of the hoisting motor 22 is represented by a polynomial of degree 2 of the input voltage.
  • the reference overload determination threshold curve change determination means 63 determines whether to change the reference overload determination threshold curve 1 (step S3, C step). It should be noted that this decision is made manually and is not made automatically by the overload determination device 24. In the case of deciding the change, in addition to the case of intentionally lowering the threshold when the customer wants to move it to the safe side, even if the threshold is set to 117.5% due to variations in individual hoisting machines. It is assumed that the threshold is raised when the winding stops when the load is 110% or less, or the threshold is lowered when the winding does not stop in the range of 110% to 125% of the load.
  • step S4 if the reference overload determination threshold curve 1 (overload threshold) is not changed, the overload of the target hoisting motor 22 is determined based on the reference overload determination threshold curve 1 (Ste S4-1).
  • the target overload of the hoisting motor 22 is based on the corrected overload determination threshold curve 2 formed by a quadratic equation in which the intercept of the reference function is corrected. Is determined (step S4-2).
  • the overload determination means 61 includes the input voltage (value) detected by the input voltage detector 53, the current value detected by the current detector 54, and the reference overload derived by the reference overload determination threshold curve deriving means 62. The above processing (overload determination) is performed based on the determination threshold curve 1.
  • Reference numeral 1 denotes a reference overload determination threshold curve (approximate curve) obtained from a plurality of measured values 121 by a mathematical method such as the least square method.
  • FIG. 6 is a diagram for explaining the overload determination method according to the first embodiment, and is a diagram for explaining a flow for deriving the reference overload determination threshold curve 1.
  • the reference overload threshold is determined to be 117.5% (step S21).
  • the reference overload determination threshold curve deriving means 62 reads the measured values 121 of the input voltage and current values at the reference threshold overload (117.5%) from the memory 30 (step S23).
  • step 24 a plurality of combinations of each input voltage and current value at the reference threshold overload (117.5%) are substituted into the above-mentioned quadratic equation whose constant has not been determined, and the constant a of the approximate curve thereof is substituted. (Coefficient), b (coefficient) and c (intercept) are obtained, and a quadratic equation is created (step 25).
  • a “reference overload determination” (as a reference threshold for overload determination) including a reference function that defines the current (i) by a quadratic equation of the input voltage (v)
  • the overload of the target hoisting motor 22 is determined. Specifically, when attempting to lift the load 51 at a constant power supply voltage, the value of the current flowing through the hoisting motor 22 once rises abruptly, then slightly decreases and settles to a substantially constant current value. When the constant current value exceeds the reference threshold value, it is determined to be overload, the power supply is cut off, and the hoisting motor 22 is stopped. This makes it possible to perform overload determination with higher determination accuracy when used with any input voltage in the use range, as compared with the overload determination based on the threshold value by the approximation straight line described in the prior art document.
  • FIG. 7 is a diagram for explaining the overload determination method according to the first embodiment, and is an explanatory diagram regarding a change in the reference overload determination threshold curve 1.
  • the derivation of the reference overload determination threshold curve 1 has been described above with reference to FIGS. 5 to 6 as the reference threshold for overload determination is 117.5%. However, it is assumed that the standard threshold value is changed (corrected) to, for example, 115% after shipping in response to a request from the customer to improve safety. In that case, the overload of the target hoisting electric motor 22 is determined based on the corrected overload determination threshold value curve 2 (2-115) in which the reference threshold value (load) is 115%.
  • FIG. 7 shows a reference overload determination threshold curve 1 when the reference threshold is 117.5% and a corrected overload determination threshold curve 2 (2-115) when the reference threshold is 115%.
  • the corrected overload determination threshold curve 2 (2-115) basically passes the reference overload determination threshold curve 1 through a current value of 115% load and rated voltage (400V) as shown in FIG. Is a curve translated in the vertical axis (y-axis) direction.
  • the current value at the rated input voltage with a load of 115% (Z%) is obtained from the proportional relationship between the current value of 100% load and the current value of 117.5% load stored in the memory 30.
  • FIG. 8 is a diagram for explaining the overload determination method according to the first embodiment, and is a diagram for explaining in more detail the processing flow regarding the change of the reference overload determination threshold curve 1.
  • FIG. 9 is a diagram for explaining the overload determination method according to the first embodiment, and is an explanatory diagram regarding the corrected overload determination threshold curve 2.
  • the correction overload determination threshold curve curve deriving means 64 derives the correction overload determination threshold curve 2 for changing (correcting) the reference overload determination threshold curve 1.
  • the overload determination means 61 performs the overload determination.
  • step 42 the reference overload determination threshold curve 1 is translated in the y-axis direction (longitudinal direction) so as to pass through the measured current value at the rated voltage (400 V) at the overload Z% (the intercept c is changed). .. Then, a curve obtained by moving the reference overload determination threshold curve 1 in parallel is set as a corrected overload determination threshold curve 2 (corrected overload determination threshold curve 2-115 when the overload is 115%) (step 43).
  • FIG. 7 is a diagram illustrating the above processing and has been described above.
  • the interval between the curve 1 (overload 117.5%) and the curve 100 (rated load 100%) in the y-axis direction is (117.5-Z) :( Z-100).
  • FIG. 9 is an explanatory diagram in the case of NO (when the difference is not within the fixed range).
  • the overload of the corrected overload determination threshold curve 2 (2-110) to be obtained is 110%, and the difference from the overload 117.5% of the reference overload determination threshold curve 1 exceeds 5%.
  • Draw a curve (a curve that passes through the distributed points) that is proportionally distributed at 5:10.
  • the curves 1 and 100 of the input voltages 340 V, 400 V, and 460 V are divided by 7.5: 10, and the curves pass through the points.
  • the above-mentioned proportionally divided curve is used as a correction overload determination threshold curve 2 (correction overload determination threshold curve 2-110 at 110% overload).
  • a manufacturing method for manufacturing the hoisting machine 21 in which the above-described overload determination can be performed by the above-described microcomputer is as follows. That is, the current (i) is defined by the quadratic equation of the input voltage (v) as described in the above B step (step S2) based on the measurement value previously measured in the above A step (step S1).
  • the above-mentioned microcomputer is equipped with a function of deriving the reference overload determination threshold curve, which is the above-mentioned reference overload determination threshold curve as a reference threshold for overload determination (mounting step).
  • step C step S3 above, it is determined whether to change the reference overload determination threshold curve.
  • step S3 when the reference overload determination threshold curve is changed, the reference overload determination threshold curve is set to the intercept of the reference function as described in step S4-2 above. Is changed to a corrected overload determination threshold curve having a corrected quadratic equation, and is mounted on the microcomputer (change step).
  • step S3 when the reference overload determination threshold curve is not changed, the reference overload determination threshold curve is left mounted.
  • the hoisting machine 21 capable of judging the overload of the hoisting motor 22 with high accuracy as described above.
  • the curve for overload determination can be changed from the reference overload determination threshold curve to the corrected overload determination threshold curve before the hoisting machine 21 is shipped, the individual variation of the product is well absorbed. Since the hoisting machine 21 can be shipped in this state, the quality can be stabilized.
  • the overload determination method is the overload determination method described in the first embodiment, in which the input voltage region for determining overload is a low voltage side input voltage region and a high voltage higher than the low voltage side input voltage region. It is divided into a voltage side input voltage region, and an overload is determined by a method including A step, B step, C step and D step in the low voltage side input voltage region, and an A step and a current in the high voltage side input voltage region.
  • the reference overload as a reference threshold for overload determination, which is a reference function that defines the current (i) by a linear expression of the input voltage (v) instead of the reference overload determination threshold curve.
  • the overload of the target hoisting motor is corrected based on the corrected overload judgment threshold straight line obtained by correcting the reference overload judgment threshold straight line.
  • D2 step for determining the load including.
  • the input voltage region for determining overload is divided into a low voltage side input voltage region and a high voltage side input voltage region having a higher voltage than the low voltage side input voltage region, and the reference overload determination threshold is set in the low voltage side input voltage region.
  • Overload of the target hoisting motor is determined based on the curve, and in the high voltage side input voltage region, overload is determined by the reference overload threshold straight line instead of the reference overload determination threshold curve. By doing so, the risk of erroneous overload determination is reduced.
  • FIG. 10 is a diagram for explaining the overload determination method according to the second embodiment, and is a diagram showing functional blocks of the overload determination device 24 of the hoisting motor 22.
  • FIG. 2 is different from the diagram for explaining the overload determination method according to the first embodiment (the diagram showing the functional blocks of the overload determination device 24 of the hoisting motor 22) in that the overload determination device 24 is a sensor.
  • the overload determination device 24 is a sensor.
  • This is a point provided with a straight line deriving means 65, a reference overload determination threshold straight line change determining means 66, and a corrected overload determination threshold straight line deriving means 67.
  • the configuration shown in FIG. 10 also differs from the configuration shown in FIG. 2 in that a sounding device 27 for generating a predetermined sound and an interface 28 for connecting to an external device and transmitting / receiving information are provided.
  • the "reference overload determination threshold straight line deriving means” 65 is a microcomputer that executes a function of reading a program and deriving the reference overload determination threshold straight line 3.
  • the “reference overload determination threshold straight line change determination means” 66 is a microcomputer that reads a program and determines whether to change the reference overload determination threshold straight line 3.
  • the “correction overload determination threshold straight line deriving means” 67 is a microcomputer that executes a function of reading a program and deriving the correction overload determination threshold straight line 4.
  • FIG. 11 is a diagram for explaining the processing flow of the overload determination method according to the second embodiment.
  • FIG. 12 is a diagram for explaining the overload determination method according to the second embodiment.
  • step S51 it is determined whether or not to divide the input voltage region. For example, when the power supply voltage is 420 V or higher, it may be decided to divide the input voltage region uniformly.
  • step S51 division: YES
  • step S52 it is divided into a low voltage side input voltage region and a high voltage side input voltage region (step S52).
  • the low voltage side input voltage region is set to 340V to 420V
  • the high voltage side input voltage region is set to 420V to 460V. This is because the amount of change in the value of the current flowing through the hoisting electric motor 22 is starting to decrease near 420 V even if the load is changed.
  • the input voltage region is divided into a low voltage side input voltage region and a high voltage side input voltage region having a higher voltage than the low voltage side input voltage region (step S53), and the processing flow is different for each.
  • the processes of steps S54 to S57 are performed.
  • the processes of steps S58 to S61 are performed.
  • the sensor 23 measures the relationship between the input voltage and the current in the constant load 51 of the hoisting motor 22 (step S54, step A).
  • the reference overload determination threshold curve deriving means 62 uses the reference value 121 of the input voltage (v) to define the current (i) based on the measured current value 121.
  • a reference overload determination threshold curve 1 (overload 117.5%) as a reference threshold is derived (step B).
  • the reference overload determination threshold curve change determination means 63 determines whether or not to change the reference overload determination threshold curve 1 (step S56, C step). ..
  • the overload determination means 61 determines the overload of the target hoisting electric motor 22 based on the reference overload determination threshold curve 1 (step S571, D step).
  • the target is based on the correction overload determination threshold curve 2 which is derived by the correction overload determination threshold curve deriving means 64 and which is a quadratic equation in which the intercept of the reference function is corrected.
  • Load 117.5%) is translated based on the corrected overload judgment threshold curve 2 (2-112.5), which is translated in the y-axis direction so as to pass through the current value flowing at overload 112.5% at the rated input voltage 400V. judge.
  • the overload determination means 61 includes the input voltage (value) detected by the input voltage detector 53, the current value detected by the current detector 54, and the reference overload derived by the reference overload determination threshold curve deriving means 62. The above process is performed based on the determination threshold curve 1.
  • the sensor 23 measures the relationship between the input voltage and the current in the constant load 51 of the hoisting motor 22 (step S58, A2 step).
  • the reference overload determination threshold straight line deriving means 65 is a reference for the overload determination, which is based on the measured value 121 of the current, and which comprises a reference function that defines the current (i) by a linear expression of the input voltage (v).
  • a reference overload determination threshold line 3 as a threshold value is derived (step S58, B2 step).
  • the reference overload determination threshold straight line 3 is derived by the reference overload determination threshold straight line deriving means 65.
  • the “first-order equation” means an equation in which the current of the hoisting motor 22 is represented by a polynomial of degree 1 of the input voltage.
  • the reference overload determination threshold line 3 is a straight line, it can be easily derived in comparison with the reference overload determination threshold curve 1, which is a curved line. Since both the reference overload determination threshold line 3 and the reference overload determination threshold curve 1 have a load of 117.5%, the low voltage side input voltage region (340V to 420V) and the high voltage side input voltage region (420V) (-460V), the two must be continuous with the same current value at an input voltage of 420V which is the boundary. Therefore, the reference overload determination threshold line 3 is a line passing through this point.
  • the reference overload judgment threshold line 3 can be derived.
  • One point is also determined by determining the current value at the highest voltage (460V) in the high voltage side input voltage region (420V to 460V). It is determined in consideration of the current value characteristic in the high voltage side input voltage region (420V to 460V). Here, the current value is set to be equal to or larger than the current value at the input voltage of 460 V of the reference overload determination threshold curve 1.
  • the overload determination means 61 determines the overload of the target hoisting electric motor 22 based on the reference overload determination threshold line 3 (steps S61-1, D2). Step).
  • the hoisting motor 22 to be targeted is based on the corrected overload determination threshold line 4 which is a linear equation corrected (derived) by the corrected overload determination threshold line deriving means 67.
  • Overload is determined (step S61-2, D2 step). It is to be noted that reference numeral 100 in FIG. 9 is a load curve at the rated load (100%).
  • the reference overload determination threshold straight line change determination means 66 determines whether to change the reference overload determination threshold straight line 3 in accordance with the change of the reference threshold or the like (step S60, C2 step).
  • the reference overload determination threshold line 3 is also corrected to the corrected overload determination threshold line 4 in many cases. ..
  • the reference overload determination threshold curve 1 load 117.5%) is translated in the y-axis direction so that the curve 1 passes through the measured current value of the load 112.5% at the rated voltage 400V.
  • the overload determination threshold curve 2 (2-112.5, load 112.5%) is corrected
  • the reference overload determination threshold line 3 (load 117.5%) is also corrected. The load was corrected to 112.5%).
  • the correction overload determination threshold straight line 4 is a straight line, it can be easily derived in comparison with the correction overload determination threshold curve 2 which is a curve. Since both the corrected overload determination threshold straight line 4 and the corrected overload determination threshold curve 2 have a load of 112.5%, the low voltage side input voltage region (340 V to 420 V) and the high voltage side input voltage region (420 V (-460V), the two must be continuous with the same current value at an input voltage of 420V which is the boundary. Therefore, the correction overload determination threshold straight line 4 is a straight line passing through this point.
  • the reference overload judgment threshold line 3 can be derived.
  • One point is also determined by determining the current value at the highest voltage (460V) in the high voltage side input voltage region (420V to 460V). It is determined in consideration of the current value characteristic in the high voltage side input voltage region (420V to 460V). Here, the current value is set to be equal to or larger than the current value at the input voltage of 460 V of the reference overload determination threshold curve 1.
  • the overload determining means 61 includes an input voltage (value) detected by the input voltage detector 53 and a current value detected by the current detector 54, a straight line 3 derived by the reference overload determining threshold straight line deriving means 65, Alternatively, it is determined whether or not there is an overload based on the straight line 4 derived by the corrected overload determination threshold straight line deriving means 67.
  • step S51 division: NO
  • the process of FIG. 4 is performed. Since it is performed as described above, it is possible to perform the overload determination with a higher determination accuracy that is closer to the actual overload, and even if the overload threshold is changed, the overload determination of the hoisting motor 22 can be performed with a higher determination accuracy.
  • the input voltage region is divided into a low voltage side input voltage region and a high voltage high voltage side input voltage region, and the overload is determined by the reference overload determination threshold curve 1 and the reference overload threshold straight line, respectively. The risk of erroneous determination of can be further reduced.
  • the manufacturing method for manufacturing the hoisting machine 21 in which the above-described overload determination can be performed by the microcomputer is as follows.
  • the mounting step includes a low voltage side mounting step and a high voltage side mounting step.
  • the function of deriving the reference overload determination threshold curve is mounted on the microcomputer.
  • the high voltage side mounting step in which the input voltage region for determining the overload is the higher voltage side than in the low voltage side mounting step, the current (i) is calculated by the linear expression of the input voltage (v) as described above.
  • the function of deriving a reference overload threshold straight line as a reference threshold for overload determination that is a defined reference overload threshold straight line is installed in the microcomputer instead of the function of deriving a reference overload determination threshold curve.
  • the changing step includes a low voltage side changing step and a high voltage side changing step. Then, in the low voltage side changing step, the reference overload determination threshold curve is changed to the corrected overload determination threshold curve and mounted on the microcomputer.
  • the high voltage side changing step when the input voltage region for judging overload is higher than in the low voltage side changing step, the reference overload judgment threshold curve is corrected and the reference overload judgment threshold straight line is corrected. It is changed to a judgment threshold line and mounted on a microcomputer.
  • the hoisting machine 21 it is possible to perform overload determination with a higher determination accuracy that is closer to the actual overload, and even if the overload threshold value is changed, the overload determination of the hoisting motor 22 with a high determination accuracy can be continued. It is possible to manufacture the hoisting machine 21. Moreover, in the hoisting machine 21 manufactured, the overload is determined by the reference overload determination threshold curve in the input voltage region where the input voltage region is the low voltage side. On the other hand, when the input voltage region is the high voltage side input voltage region, overload is determined by the reference overload determination threshold straight line. Therefore, it is possible to manufacture the hoisting machine 21 which can further reduce the risk of erroneous determination of overload.
  • FIG. 13 is a diagram for explaining the overload determination method according to the third embodiment.
  • the method of deriving the reference overload determination threshold curve 1 is changed from the overload determination method described in the first embodiment. That is, in the third embodiment, when the reference overload determination threshold curve 1 is changed in the C step, the lower limit load that guarantees the hoisting operation of the reference hoisting motor measured in the A step is set to the lower limit load.
  • the second load set to the lower limit load that guarantees hoisting stop of the reference hoisting motor, based on the measured value of the current at each input voltage of the reference hoisting motor, the first load A curve and a second load curve are obtained, and based on the difference between the current values at the respective input voltages of both curves, the target winding is based on the corrected overload determination threshold curve 2 which is a quadratic equation in which the coefficient and the intercept of the reference function are corrected. Determine the overload of the upper motor.
  • reference numeral 13 is a first load curve at the first load (load 125%) set to the lower limit load that guarantees hoisting of the hoisting motor 22. If the current value exceeds this curve, the hoisting operation must be stopped.
  • Reference numeral 14 is a second load curve at the second load (load 112.5%) set to the lower limit load that guarantees the hoisting operation of the hoisting motor 22. The hoisting operation is guaranteed at the load of 112.5%, and the hoisting electric motor 22 must perform the hoisting operation (not stop).
  • the first load curve 13 and the second load curve 14 are curves obtained based on the measured value 121 of the current at each input voltage of the hoisting electric motor 22 which is the reference. These curves were obtained by the same method as that described in Embodiment 1 with reference to FIGS.
  • a corrected overload determination threshold curve 2 which is a quadratic equation in which the coefficient and the intercept of the reference function are corrected is derived, and the curve thereof is derived. Based on the above, the overload of the target hoisting electric motor 22 is determined.
  • a manufacturing method for manufacturing the hoisting machine 21 in which the above-described overload determination can be performed by the above-described microcomputer is as follows. That is, the mounting step, the C step, and the changing step as described in the first embodiment are executed.
  • the corrected overload determination threshold curve in the above-mentioned changing step is based on the difference between the current values at the input voltages of the first load curve and the second load curve, and the coefficient and the intercept of the reference function. It was corrected.
  • the first load curve (indicated by reference numeral 13 in FIG. 13) is used to measure the relationship between the input voltage and the current by applying various loads to the reference hoisting motor and to show the hoisting operation of the reference hoisting motor.
  • the second load curve is set to a lower limit load that applies various loads to the reference hoisting motor, measures the relationship between the input voltage and the current, and guarantees hoisting stop of the reference hoisting motor. It is calculated based on the measured value of the current at the input voltage of the hoisting electric motor as the reference in the second load.
  • the reference overload determination threshold curve (between 110% and 125% load) 1A is the curve between the curve 13 (125% load) and the curve 14 (110% load). Therefore, it is possible to manufacture the hoisting machine 21 in which the operation is guaranteed when the load is 110% and the operation is stopped when the load is 125%.
  • the curve 13 is a load curve with a load of 125% (the load that must be absolutely stopped) as in the third embodiment, but the curve 14 is a load curve with a load of 115%.
  • the load of 115% is a load of 110% or more for which the hoisting operation is guaranteed, and the hoisting operation of the hoisting motor 22 may be stopped. This is mainly determined by the manufacturer and user of the hoisting motor 22 (hoisting machine 21) in consideration of the convenience and safety of the hoisting machine 21.
  • the reference overload determination threshold value curve 1A is a curve between the curve 13 with a load of 125% and the curve 14 with a load of 110% in the same manner as in the third embodiment except that the curve 14 is changed. Part of the reference overload determination threshold curve 1A may overlap the curve 13 or the curve 14.
  • the reference overload determination threshold curve 1B can be easily created. It is possible to easily meet the user request when the overload determination by the reference overload determination threshold value curve 1A is not strictly the load 117.5% but somewhere between the load 110% and the load 125%.
  • braking device 29 ... CPU, 30 ... memory, 31 ... ROM, 32 ... RAM, 51 ... Load, 52 ... Power supply, 53 ... Input voltage detector, 54 ... Current detector, 61 ... Overload determination means, 62 ... Reference overload determination threshold curve deriving means, 63 ... Reference overload determination threshold Curve change determination means, 64 ... Corrected overload determination threshold curve derivation means, 65 ... Reference overload determination threshold line derivation means, 66 ... Reference overload determination threshold line change determination means, 67 ... Corrected overload determination threshold line derivation means, 71 ... Braking command means, 100 ... Load curve (rated load 100%), 121 ... Measured value (actual measured value), 125 ... Overload determination threshold straight line (Overload 125%), 261 ... Braking mechanism

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Control Of Electric Motors In General (AREA)
  • Tests Of Circuit Breakers, Generators, And Electric Motors (AREA)

Abstract

L'invention concerne un procédé d'évaluation d'une surcharge d'un moteur électrique bobiné, le procédé rendant possible l'évaluation d'une surcharge grâce à une excellente précision, et par ailleurs l'évaluation continue d'une surcharge grâce à une précision élevée même lorsqu'une valeur seuil de surcharge est changée.　Ce procédé comprend : une étape A consistant à mesurer la relation entre une tension d'entrée et un courant sur diverses charges dans un moteur électrique bobiné faisant office de référence ; une étape B consistant à dériver, sur la base de la valeur mesurée, une courbe de valeurs seuils d'évaluation de surcharge de référence en tant que valeur seuil de référence afin d'évaluer une surcharge, la valeur seuil de référence étant obtenue par l'intermédiaire d'une fonction de référence dans laquelle le courant (i) est défini à l'aide d'une expression quadratique de la tension d'entrée (v) ; une étape C consistant à déterminer s'il faut changer la courbe de valeurs seuils d'évaluation de surcharge de référence ; et une étape D consistant à évaluer une surcharge du moteur électrique bobiné faisant office de sujet sur la base de la courbe de valeurs seuils d'évaluation de surcharge de référence lorsque la courbe de valeurs seuils d'évaluation de surcharge de référence est inchangée, et à évaluer la surcharge du moteur électrique bobiné faisant office de sujet sur la base d'une courbe de valeurs seuils d'évaluation de surcharge corrigée obtenue à l'aide d'une expression quadratique dans laquelle un segment de la fonction de référence est corrigé lorsque la courbe de valeurs seuils d'évaluation de surcharge de référence est changée.
PCT/JP2019/044967 2018-11-16 2019-11-15 Procédé d'évaluation de surcharge d'un moteur électrique bobiné, et procédé de fabrication de bobineur WO2020101033A1 (fr)

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JP2020556202A JP7253307B2 (ja) 2018-11-16 2019-11-15 巻上電動機の過負荷判定方法および巻上機の製造方法
CN201980071085.3A CN112955400B (zh) 2018-11-16 2019-11-15 起重电动机的过载判定方法以及卷扬机的制造方法

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114264948A (zh) * 2021-12-17 2022-04-01 北京市科通电子继电器总厂有限公司 一种产品过负载特性分析方法、装置、电子设备及介质

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5133451A (fr) * 1974-09-13 1976-03-22 Hitachi Ltd
JPH05229785A (ja) * 1991-12-26 1993-09-07 Mitsubishi Electric Corp 巻上機の電動機過負荷検出装置
JP2593270B2 (ja) * 1992-04-27 1997-03-26 株式会社キトー 電力測定式負荷検出装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5133451A (fr) * 1974-09-13 1976-03-22 Hitachi Ltd
JPH05229785A (ja) * 1991-12-26 1993-09-07 Mitsubishi Electric Corp 巻上機の電動機過負荷検出装置
JP2593270B2 (ja) * 1992-04-27 1997-03-26 株式会社キトー 電力測定式負荷検出装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114264948A (zh) * 2021-12-17 2022-04-01 北京市科通电子继电器总厂有限公司 一种产品过负载特性分析方法、装置、电子设备及介质
CN114264948B (zh) * 2021-12-17 2023-09-05 北京市科通电子继电器总厂有限公司 一种产品过负载特性分析方法、装置、电子设备及介质

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CN112955400A (zh) 2021-06-11
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CN112955400B (zh) 2023-02-24

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