WO2018158832A1 - Dispositif de détection de courant transversal, procédé de détection de courant transversal et rotor - Google Patents

Dispositif de détection de courant transversal, procédé de détection de courant transversal et rotor Download PDF

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Publication number
WO2018158832A1
WO2018158832A1 PCT/JP2017/007842 JP2017007842W WO2018158832A1 WO 2018158832 A1 WO2018158832 A1 WO 2018158832A1 JP 2017007842 W JP2017007842 W JP 2017007842W WO 2018158832 A1 WO2018158832 A1 WO 2018158832A1
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WIPO (PCT)
Prior art keywords
rotor
cross current
torque
load motor
stator
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PCT/JP2017/007842
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English (en)
Japanese (ja)
Inventor
祐輔 鶴見
米谷　晴之
正樹 亀山
啓宇 川崎
Original Assignee
三菱電機株式会社
Priority date (The priority date 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 date listed.)
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Application filed by 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2017539696A priority Critical patent/JP6249433B1/ja
Priority to PCT/JP2017/007842 priority patent/WO2018158832A1/fr
Publication of WO2018158832A1 publication Critical patent/WO2018158832A1/fr

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    • 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

Definitions

  • the present invention relates to a cross current detection device, a cross current detection method, and a rotor, and more particularly to a cross current detection device, a cross current detection method, and a rotation of a detection target for testing a rotor of a squirrel-cage induction machine. It is about the child.
  • a rotor is used in a rotating electric machine such as an electric motor or a generator.
  • the rotor is subjected to a conformance test to detect whether it is a good product before shipment. If the performance test is performed in a state in which the rotor is incorporated in the rotating electrical machine during the conformance test, the quality can be determined sufficiently. However, since such a test takes time and labor, it is practically impossible to inspect all the rotors.
  • Patent Document 1 an apparatus for performing a rotor compatibility test without being incorporated in a rotating electrical machine has been developed (see, for example, Patent Document 1 and Patent Document 2).
  • the rotor is rotated in a state where the rotor to be tested is inserted into the stator, the torque value at that time, and the power supply to the stator are supplied. Based on the current value of the stator when connected, the non-defective and defective rotors are selected.
  • the present invention has been made to solve such a problem, and provides a rotor, a cross current detection device, and a cross current detection method capable of clearly and easily detecting a cross current of the rotor.
  • the purpose is to get.
  • the present invention has a stator iron core and a stator winding wound around the stator iron core, and a stator jig capable of inserting a rotor to be measured therein, and the inside of the stator jig.
  • a voltage source that applies a voltage that generates a rotating magnetic field to the stator winding, a load motor that rotates the rotor inserted in the stator jig, and a characteristic value of the load motor
  • a determinator for determining whether or not a cross current is generated in the rotor based on a characteristic value of the load motor measured by the measuring machine.
  • the characteristic value of the load motor is measured in the reverse rotation region, which is the rotation in the direction opposite to the rotation direction of the rotating magnetic field of the stator, and the characteristic value is compared with the threshold value.
  • FIG. 1 It is a perspective view which shows the structure of an example of the holding mechanism support part provided in the cross current detection apparatus which concerns on Embodiment 1 of this invention. It is a flowchart which shows the flow of a process of the cross current detection method in the cross current detection apparatus which concerns on Embodiment 1 of this invention. It is a perspective view which shows the structure of the rotor core of the measuring object of the cross current detection apparatus which concerns on Embodiment 1 of this invention. It is a perspective view which shows the structure of the rotor of a measuring object of the cross current detection apparatus which concerns on Embodiment 1 of this invention. It is a figure which shows the difference in the torque characteristic by the magnitude of the cross current detected by the cross current detection apparatus which concerns on Embodiment 1 of this invention.
  • FIG. 1 is a schematic diagram showing a configuration of a cross current detection device according to Embodiment 1 of the present invention.
  • the rotor 1 to be measured is inserted into the stator jig 2 and is rotatably held by the stator jig 2.
  • the rotor 1 is composed of a rotor iron core and a secondary conductor provided around the rotor iron core.
  • the secondary conductor 38 shown in FIG. 13 is provided around the rotor core 31 of the rotor 1 shown in FIG. 9 or the rotor 1 as shown in FIG. 12 is generated.
  • the rotor 1 for example, an ordinary cage rotor used in a cage induction machine will be described as an example. However, the embodiment is not limited thereto.
  • the cross current detection device according to the first embodiment can be applied to all rotors used in all squirrel-cage induction machines such as deep groove rotators and double squirrel-cage rotors.
  • the rotating shaft 7 of the rotor 1 is supported by two holding mechanism support portions 14 via the holding mechanism 3.
  • two holding mechanism support portions 14 are provided in FIG. 1, any number may be used as long as it is two or more.
  • the holding mechanism 3 is composed of, for example, a ball bearing or a slide bearing. Alternatively, the holding mechanism 3 that is assembled to the rotor 1 may be used.
  • the stator jig 2 is composed of a stator core 4 and a stator winding 5.
  • the stator core 4 is formed of a laminated steel plate in which a plurality of core plates pressed in an annular shape are stacked.
  • the stator winding 5 is wound around the stator core 4.
  • a voltage source 6 is connected to the stator winding 5.
  • the voltage source 6 is composed of, for example, a three-phase voltage source.
  • the voltage source 6 is not limited to this, and any voltage source can be used as long as the voltage source 6 can generate a voltage waveform that generates a rotating magnetic field inside the stator jig 2. Also good.
  • the voltage source 6 may be a single-phase AC voltage source.
  • the rotating shaft 7 of the rotor 1 is connected to the rotating shaft 11 of the load motor 10 via a coupling 8 and a torque meter 9.
  • the load motor 10 is connected to the controller 12.
  • the controller 12 controls the speed of the load motor 10.
  • the controller 12 is composed of a servo amplifier, for example.
  • the load motor 10 is provided with a measuring device for measuring the characteristic value of the load motor 10. In the example of FIG. 1, a torque meter 9 is provided as the measuring machine.
  • the torque meter 9 functions as a measuring machine that measures the torque of the load motor 10.
  • a determination device 13 is connected to the torque meter 9.
  • the torque value of the load motor 10 measured by the torque meter 9 is input to the determinator 13.
  • the holding mechanism 3 is supported by the holding mechanism support part 14.
  • the stator jig 2 is supported by the stator jig support 15.
  • the torque meter 9 is supported by the torque meter support portion 16.
  • the load motor 10 is supported by the load motor support portion 17.
  • These support portions 14 to 17 are fixed to the device base portion 18.
  • the direction of arrangement of the cross current detection device can be changed according to the production line.
  • the cross current detection device is arranged so that the rotating shafts 7 and 11 are horizontal.
  • the present invention is not limited thereto, and for example, the cross current detection device may be arranged so that the rotation shafts 7 and 11 are vertical.
  • the stator jig support portion 15 is arranged in the axial direction of the rotary shaft 7, that is, in the horizontal direction in FIG. It can also be made movable.
  • a moving device for moving the stator jig support 15 with respect to the device base 18.
  • a moving device composed of a ball screw 19 and a ball screw drive motor 20 is installed.
  • the ball screw driving motor 20 rotates the ball screw 19 to move the stator jig support 15.
  • the moving device is not limited to the example shown in FIG. 2, and the moving device may be constituted by a linear motor, an air cylinder, a hydraulic cylinder, a hydraulic cylinder, or the like.
  • the holding mechanism support part 14 is comprised from one plate-shaped member, for example.
  • a hole for inserting the holding mechanism 3, that is, a through hole is provided at the center of the plate-like member.
  • the upper portion 21 is separated from the lower portion 22 by lifting the upper portion 21 as shown in FIG. 3. Thereby, it becomes easy to insert the rotor 1.
  • the plate-like member constituting the holding mechanism support portion 14 may be constituted by three gripping components 26 arranged in three directions as shown in FIG. In that case, when inserting the rotor 1 into the holding mechanism support part 14, the gripping component 26 is spread outward in three directions to facilitate the insertion of the rotor 1. Further, after inserting the rotor 1, the rotor 1 is gripped by the gripping component 26 from three directions. As described above, by configuring the holding mechanism support portion 14 as shown in any of FIGS. 3 to 6, it is possible to provide a gap in which the rotor 1 can be easily inserted in the holding mechanism support portion 14. .
  • FIG. 6 is a modification of FIG. In FIG. 5 described above, an example in which the plate-like member constituting the holding mechanism support portion 14 is constituted by three gripping components 26 is shown.
  • the holding mechanism support portion 14 includes a single plate-like member provided with a hole 27 in the central portion, and three gripping components 26 provided in the holes 27 of the plate-like member. It is composed of FIG. 6 shows a state where the three gripping parts 26 are spread outward. In this state, the tips of the three gripping parts 26 are aligned with an inner diameter 28 indicated by a broken line.
  • the inner diameter 28 is larger than the outer peripheral surface of the rotor 1, and the inner diameter 28 and the outer peripheral surface of the rotor 1 do not interfere with each other. Therefore, the rotor 1 can be inserted also from the axial direction of the rotating shaft 7. Thereby, the freedom degree of arrangement
  • the cross current detection device is configured as described above.
  • the rotor 1 is rotated in the reverse direction, and in this state, the torque of the load motor 10 is measured by the torque meter 9.
  • the reverse rotation refers to rotation in which the rotation direction of the rotor 1 is opposite to the rotation direction of the rotating magnetic field generated inside the stator jig 2.
  • the torque value thus obtained is transmitted from the torque meter 9 to the determinator 13.
  • the determinator 13 compares the torque value input from the torque meter 9 with a preset threshold value, and determines that the rotor 1 is a rotor that generates a cross current when the torque value exceeds the threshold value.
  • the threshold value may be an arbitrary value that exists in a range between two torque values by creating a rotor that does not generate a cross current and a rotor that generates the torque and measuring each torque value.
  • FIG. 7 is a flowchart showing a processing flow of the cross current detection device from the start of measurement to the end of determination.
  • step S ⁇ b> 1 the rotor 1 is attached to the holding mechanism support portion 14 via the holding mechanism 3 and is inserted into the stator jig 2.
  • step S ⁇ b> 2 a voltage having a voltage waveform that generates a rotating magnetic field inside the stator jig 2 is applied from the voltage source 6 to the stator winding 5 of the stator jig 2. .
  • step S 3 the controller 12 drives the load motor 10 to rotate the rotor 1 through the coupling 8 and the torque meter 9.
  • step S4 the torque of the load motor 10 in the reverse rotation state is measured using the torque meter 9 connected to the rotor 1 and the load motor 10 through the coupling 8.
  • step S3 and step S4 may be interchanged.
  • the torque of the load motor 10 is measured by changing the rotation speed of the rotor 1 with the load motor 10 until the rotation is reversed, that is, until s> 1. By doing this, the measurement result at the time of forward rotation, that is, 0 ⁇ s ⁇ 1, and the measurement result at the time of reverse rotation, that is, when s> 1 are obtained.
  • the rotor 1 When the measurement result at the time of forward rotation obtained in this way is compared with the threshold for forward rotation and the difference from the threshold for forward rotation is larger than a predetermined ratio, the rotor 1 is defective. Can be detected.
  • the threshold value for forward rotation will be described.
  • the torque of the load motor 10 is measured in advance using the rotor 1 having the secondary conductor 38 properly formed by die casting without any problem, and the measurement result is stored as a threshold value for forward rotation. In this way, it is possible to detect whether the rotor 1 is a non-defective product or a defective product by comparing the measurement result obtained when the rotor to be measured is rotated forward and the threshold for forward rotation.
  • the defective product in this case is, for example, a case where the secondary conductor 38 of the rotor 1 contains a void and the secondary resistance is higher than the design value, or the secondary conductor 38 of the rotor 1 is configured.
  • the conductor rod 33 is cut and a gel guess phenomenon occurs.
  • what is necessary is just to set the arbitrary values which can be accept
  • step S5 the measurement result of the torque meter 9 at the time of reverse rotation is taken into the determinator 13, and the torque of the measurement result is compared with a preset reverse rotation threshold value. If the measured torque is less than or equal to the reverse rotation threshold, the process proceeds to step S6. If the measured torque is greater than the reverse rotation threshold, the process proceeds to step S7.
  • step S6 since the torque of the measurement result is equal to or less than the reverse rotation threshold value, it is determined that there is no cross current.
  • step S7 since the measured torque is larger than the reverse rotation threshold, it is determined that there is a cross current.
  • FIG. 8 is a perspective view of the rotor core 31 of the rotor 1 used in this experiment.
  • a cage rotor will be described as an example of the rotor 1.
  • the rotor core 31 is composed of a laminated steel plate in which a plurality of iron core plates obtained by press-punching electromagnetic steel plates in an annular shape are laminated.
  • the rotor 1 is formed by providing a secondary conductor 38 formed by die-casting aluminum on the outer periphery of the rotor core 31. A perspective view of the rotor 1 thus formed is shown in FIG. As shown in FIG.
  • a short-circuit ring 32 is provided at the upper end portion and the lower end portion of the rotor core 31, and the outer periphery of the rotor core 31 is composed of a plurality of conductor rods 33.
  • a secondary conductor 38 is provided.
  • the rotor 1 in the state of FIG. 9 was subjected to a total of two heat treatments for heating to 500 ° C. and cooling. The results of measuring the relationship between slip and torque before and after heat treatment are shown in FIG. In FIG. 10, the horizontal axis represents the slip of the rotor 1 to be measured, and the vertical axis represents the torque measured by the torque meter 9. In addition, in FIG.
  • the plot “ ⁇ ” indicates the measurement result of the “cross current large” rotor before the heat treatment
  • the plot “ ⁇ ” indicates the measurement of the “cross current small” rotor after the heat treatment. Results are shown.
  • the slip is expressed by the following formula (1).
  • Fig. 11 shows the relationship between slip and efficiency.
  • the horizontal axis represents the slip of the rotor 1 to be measured, and the vertical axis represents the efficiency.
  • the plot “ ⁇ ” shows the measurement result of the rotor with “large cross current” before the heat treatment, and the plot “ ⁇ ” shows the measurement result of the rotor with “low cross current” after the heat treatment.
  • slip s 1.3 in FIG. 11, the efficiency in the case of the “cross current small” rotor with heat treatment exceeds the efficiency in the case of the “large cross current large” rotor without heat treatment by 4.3%. .
  • the torque value of the “cross current small” rotor subjected to the heat treatment twice is assumed to be no cross current
  • the torque value of the “cross current large” rotor without heat treatment is assumed to be that of the cross current.
  • an arbitrary value existing within a range between two torque values is set as the reverse rotation threshold value, it can be determined whether the rotor to be measured has a cross current or not.
  • the conductor bars 33 adjacent to the secondary conductor 38 were forcibly short-circuited.
  • the first is a rotor in which the adjacent conductor rods 33 are short-circuited once around the central portion in the axial direction of the conductor rod 33 (hereinafter referred to as the rotor 1A), and the second is the axial direction of the conductor rod 33.
  • FIG. 12 shows a perspective view of the rotor 1A that is short-circuited in the central portion in the axial direction. Moreover, the shape of the secondary conductor of the rotor 1A is shown in FIG. As shown in the enlarged view of FIG. 13, a short-circuit portion 34 is connected between adjacent conductor bars 33. What is necessary is just to form the short circuit part 34 from the same material as the conductor rod 33.
  • the short circuit part 34 should just be comprised by die-casting simultaneously with the conductor rod 33.
  • FIG. As shown in FIGS. 12 and 13, the short-circuit portion 34 is disposed on the entire circumference of the rotor 1 ⁇ / b> A.
  • the short-circuit portion 34 is arranged on the entire circumference of the rotor 1B.
  • the short-circuit portions 34 are provided at two places in total, that is, 1/3 and 2/3 of the entire length of the conductor rod 33.
  • the rotor 1A and the rotor 1B are subjected to the same heat treatment as described above twice, respectively, and the torque values at the time of reverse rotation are measured, respectively, and those torque values and the torque value of the rotor 1 without the short-circuit portion shown in FIG.
  • FIG. 14 shows the result of the comparison.
  • the rotor 1 without a short-circuit portion is “low cross current”
  • the rotor 1A short-circuited around the center in the axial direction is “cross current half-current”
  • the rotor is short-circuited at two locations in the axial direction.
  • 1B was defined as “large cross current”.
  • the horizontal axis represents the slip of the induction machine to be measured, and the vertical axis represents the torque measured by the torque meter.
  • the plot “ ⁇ ” shows the measurement result of the rotor “1B” having two short-circuited portions and heat-treated, and the plot “ ⁇ ” has one short-circuited portion and heat-treated.
  • the measurement result of the rotor 1A with “medium current in the cross current” is shown, and the plot “ ⁇ ” shows the measurement result of the rotor 1 with “small cross current” without heat short circuit and heat treatment. From FIG. 14, it can be seen that the torque at the time of reverse rotation of the rotors 1A and 1B provided with the short circuit portion 34 increases, and the torque at the time of reverse rotation increases as the cross current increases.
  • the torque in the case of the rotor 1B having “large cross current” is reduced by about 4.1% with respect to the torque in the case of the rotor 1 having “small cross current”.
  • the rate of increase in torque during reverse rotation is about 12.4 times greater than the rate of decrease in torque during normal rotation, so it is appropriate to check the cross current with the torque value during reverse rotation. Sex can be confirmed.
  • a spatial fifth-order antiphase harmonic that rotates in a direction opposite to the fundamental wave with a spatial distribution five times the fundamental wave is generated.
  • a spatial seventh-order positive harmonic that rotates in the same direction as the fundamental wave with a spatial distribution seven times the fundamental wave is also generated.
  • FIG. 15 shows a conceptual diagram of the relationship between slip and torque.
  • a solid line 35 is a torque curve of a fundamental wave
  • a dotted line 36 is a torque curve of a fifth-order antiphase harmonic.
  • the torque generated by the fifth-order antiphase harmonic is called harmonic asynchronous torque.
  • the harmonic asynchronous torque is smaller than the fundamental torque.
  • the rotor core 31 of the rotor and the secondary conductor 38 are brought into conduction, current flows not only in the direction of the conductor rod 33 but also in the circumferential direction, so that the effect of skew on harmonics is reduced. Then, a large harmonic asynchronous torque is generated.
  • an induced voltage of the fifth-order anti-phase harmonic magnetic flux is induced in the short circuit portion 34 in FIG. 12, and a cross current flows.
  • This cross current flows not only in the secondary conductor having a relatively low resistance, but also in a high resistance laminated steel sheet and a conductive portion having a small cross section, and therefore the resistance becomes high.
  • the slip s with respect to the fundamental wave is greater than 1.2, the secondary resistance becomes higher with respect to the spatial fifth-order anti-harmonic, so that it is always large in the region of slip s> 1.2 as shown in FIG. Torque is generated.
  • the above cross current detection process needs to be carried out with attention to the temperature rise of the rotor.
  • the thermal expansion coefficient of the aluminum constituting the secondary conductor 38 and the electrical steel sheet constituting the rotor core 31 are different, the secondary conductor 38 and the rotor core 31 are changed in accordance with the temperature change of the rotor 1.
  • the contact situation changes.
  • the cross current generation state may change.
  • the voltage applied from the voltage source 6 to the stator jig 2 may be lowered so that the temperature of the rotor 1 does not rise. The reason is that when the applied voltage is lowered, the secondary copper loss generated in the rotor 1 is also lowered. Further, the time for applying the voltage can be shortened, and the measurement can be performed before the temperature of the rotor 1 rises.
  • the voltage application time can be minimized by applying the voltage after the rotor 1 is rotated in reverse at a predetermined rotation speed in advance and the rotation speed is reached before the voltage is applied to the stator jig 2. .
  • the determination can be made by operating only at the rotational speed at which the reverse rotational torque is maximum and measuring the torque at the rotational speed. it can.
  • the voltage value and the application time to be applied to the stator jig 2 are determined in advance by performing a reverse rotation test of the rotor 1 in which a cross current is generated, and at a rated rotation speed of the rotor 1 in which a cross current is not generated. It is sufficient that the temperature is lower than the specified temperature.
  • the temperature may be determined by directly measuring the temperature of the surface of the rotor 1 at the rated rotational speed, or it may be determined at a temperature determined by the allowable coil temperature increase value or the allowable bearing temperature increase value of the stator jig 2. May be.
  • the determinator 13 compares the characteristic value of the load motor 10 measured with the measuring instrument when the rotor 1 is rotating in reverse with the threshold value. It is determined whether or not a cross current is generated in the rotor 1. Thus, the cross current of the rotor 1 can be detected clearly and easily by measuring the characteristic value of the load motor 10 in the reverse rotation region.
  • the voltage value and the application time are desirably set so that the temperature of the rotor 1 is equal to or lower than a predetermined temperature. In that case, when the temperature rise is below a certain level, the contact state between the secondary conductor 38 of the rotor 1 and the rotor core 31 can be made equal to that during rated operation.
  • FIG. FIG. 16 is a schematic diagram showing a configuration of a cross current detection device according to Embodiment 2 of the present invention.
  • an ammeter 29 is installed on the electric wire between the load motor 10 and the controller 12 instead of the torque meter 9 of the first embodiment.
  • the determination device 13 is connected to the ammeter 29.
  • the ammeter 29 constitutes a measuring machine for measuring the characteristic value of the load motor 10.
  • the ammeter 29 functions as a measuring instrument that measures the total current flowing through the load motor 10.
  • the current value measured by the ammeter 29 is input to the determinator 13.
  • the determining device 13 can easily calculate the torque from the total current. Therefore, a threshold is set in advance for the torque calculated by the determiner 13, and the presence or absence of the cross current is determined by comparing the threshold with the calculated torque, as in the first embodiment. Can do.
  • the use of the torque meter 9 having a movable part improves durability and maintainability in the mass production line.
  • the proportional relationship between the total current and the torque does not hold. It should be used only in the region where the proportional relationship between the total current and torque is established. For this reason, the rated torque of the load motor 10 is made sufficiently larger than the torque handled by the cross current detector. Further, the voltage applied to the stator jig 2 may be adjusted according to the rated torque of the load motor 10.
  • Embodiment 2 the same effect as in the first embodiment can be obtained. Furthermore, in Embodiment 2, the durability and maintainability in the mass production line are improved by not using the torque meter 9 having a movable part.
  • FIG. 17 is a schematic diagram showing a configuration of a cross current detection device according to Embodiment 3 of the present invention. Instead of the ammeter 29 of the second embodiment, a wattmeter 30 is installed. Since other configurations are the same as those in the second embodiment, description thereof is omitted here.
  • the wattmeter 30 constitutes a measuring machine for measuring the characteristic value of the load motor 10.
  • the wattmeter 30 functions as a measuring instrument that measures input power to the load motor 10.
  • the value of input power measured by the wattmeter 30 is input to the determinator 13.
  • the load motor 10 is a permanent magnet motor. If the loss of the permanent magnet motor, such as mechanical loss, copper loss, and iron loss, is sufficiently smaller than the input power, the value obtained by dividing the input power by the number of revolutions per second is the torque, so input at the same number of revolutions. Electric power is proportional to torque. Therefore, the input power is measured by the wattmeter 30 and the threshold value set in advance for the input power is compared with the measured input power by the determiner 13 to detect whether or not the rotor 1 is defective. be able to.
  • the loss of the permanent magnet motor such as mechanical loss, copper loss, and iron loss
  • the determining device 13 can easily calculate the torque from the input power. Therefore, a threshold is set in advance for the torque calculated by the determiner 13, and the presence or absence of the cross current is determined by comparing the threshold with the calculated torque, as in the first embodiment. Can do.
  • the use of the torque meter 9 having a movable part improves durability and maintainability in a mass production line.
  • the rated torque of the load motor 10 is made sufficiently larger than the torque handled by the cross current detector. Further, the voltage applied from the voltage source 6 to the stator jig 2 may be adjusted according to the rated torque of the load motor 10.
  • FIG. FIG. 18 is a schematic diagram showing a configuration of a cross current detection device according to Embodiment 4 of the present invention.
  • a load angle measuring device 37 is installed instead of the ammeter 29 of the second embodiment. Since other configurations are the same as those in the second embodiment, description thereof is omitted here.
  • the load angle measuring device 37 constitutes a measuring machine for measuring the characteristic value of the load motor 10.
  • the load angle measuring device 37 calculates a load angle that is a phase difference between the induced voltage and the terminal voltage.
  • the load angle obtained by the load angle measuring device 37 is input to the determinator 13.
  • the load motor 10 is a PM motor.
  • the load angle ⁇ can be calculated by the following equation (2) based on the induced voltage E, the terminal voltage V, and the primary reactance voltage I ⁇ Xs.
  • the value measured in advance is used for the primary reactance Xs.
  • the induced voltage E can be calculated from the back electromotive force constant and angular velocity of the PM motor. What is necessary is just to measure the input current I to PM motor with the ammeter built in the load angle measuring device 37 which calculates a load angle.
  • the determination device 13 can determine the presence or absence of the cross current by providing a threshold value for the load angle in advance and comparing the obtained load angle with the threshold value.
  • the output P of the load motor 10 is based on the induced voltage E, the terminal voltage V, the primary reactance Xs, and the load angle ⁇ . ).
  • the torque of the load motor 10 can be obtained by dividing the output P by the number of revolutions per second.
  • the presence or absence of the cross current of the rotor 1 can be determined by providing a threshold in advance for the calculated output P and torque. Can be easily determined.
  • the same effect as in the first embodiment can be obtained.
  • the determination device 13 calculates the output and torque of the load motor 10 using the load angle measured by the load angle measuring device 37, so the error due to copper loss is reduced.
  • the cross current can be measured with high accuracy.
  • Embodiment 5 Using the cross current detection devices according to Embodiments 1 to 4 described above, a rotor whose torque increases during reverse rotation can be selected based on the measurement results shown in FIG. 10 or FIG. For example, if the rotor 1A shown in FIGS. 12 and 13 is created in order to increase the torque during reverse rotation, the maximum torque during reverse rotation is greater than the maximum torque during normal rotation.
  • torque is generated in the direction opposite to the rotation direction, that is, a braking force is generated, which is useful for preventing reverse rotation of the rotating electrical machine.
  • fans with wind pressure, pumps with air pressure, water pressure, hydraulic pressure, etc., reverse rotation prevention of compressors, etc., and elevators, escalators etc. due to their own weight and user or counterweight weight It can be used for prevention of sliding up, prevention of reverse movement when starting on a hill on trains and automobiles, prevention of reverse rotation of hoists and cranes, prevention of reverse rotation of ship screws, and the like.
  • the slip of the rotor 1 shown in the first to fourth embodiments is larger than 1.2, that is, when the torque of the load motor 10 during reverse rotation is less than 1, That is, if the torque is configured to be greater than the maximum torque during forward rotation, the reverse rotation of the rotating electrical machine can be prevented by generating torque in the reverse rotation region in the reverse direction.

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Abstract

La présente invention concerne un dispositif de détection de courant transversal comprenant: un appareil de montage de de stator 2 dans lequel un rotor 1, qui est l'objet de la mesure, peut être inséré; une source de tension 6 qui applique une tension à une bobine de stator; et un moteur en charge 10 qui fait tourner le rotor 1. Un dispositif de mesure de couple 9 mesure une valeur de caractéristique du moteur en charge 10 quand le rotor 1 tourne dans la direction opposée à la direction de rotation d'un champ magnétique rotatif généré à l'intérieur de l'appareil de montage de stator 2, et un dispositif de détermination 13 détermine qu'un courant transversal est apparu dans le rotor 1 si la valeur de caractéristique mesurée par le dispositif de mesure de couple 9 dépasse un seuil prédéfini.
PCT/JP2017/007842 2017-02-28 2017-02-28 Dispositif de détection de courant transversal, procédé de détection de courant transversal et rotor WO2018158832A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2017539696A JP6249433B1 (ja) 2017-02-28 2017-02-28 横流電流検出装置、横流電流検出方法、および、回転子
PCT/JP2017/007842 WO2018158832A1 (fr) 2017-02-28 2017-02-28 Dispositif de détection de courant transversal, procédé de détection de courant transversal et rotor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2017/007842 WO2018158832A1 (fr) 2017-02-28 2017-02-28 Dispositif de détection de courant transversal, procédé de détection de courant transversal et rotor

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WO2018158832A1 true WO2018158832A1 (fr) 2018-09-07

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KR102472116B1 (ko) * 2021-06-16 2022-12-05 주식회사 에이치엔디멀티랩 피시험모터의 코깅토크 또는 역기전력 측정이 가능한 무부하 시험장치 및 이를 이용한 무부하 시험방법
WO2024079932A1 (fr) * 2022-10-12 2024-04-18 三菱重工機械システム株式会社 Dispositif de transport, dispositif de détection et procédé de détermination de déphasage

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CN110045279B (zh) * 2018-01-17 2021-06-29 深圳市优必选科技有限公司 电机的力矩和电流的比例关系标定方法、系统及终端设备
KR102097730B1 (ko) * 2018-12-11 2020-04-06 김병국 초고속 전동기의 검사시스템

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KR102472116B1 (ko) * 2021-06-16 2022-12-05 주식회사 에이치엔디멀티랩 피시험모터의 코깅토크 또는 역기전력 측정이 가능한 무부하 시험장치 및 이를 이용한 무부하 시험방법
WO2024079932A1 (fr) * 2022-10-12 2024-04-18 三菱重工機械システム株式会社 Dispositif de transport, dispositif de détection et procédé de détermination de déphasage

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