Motor detection system and detection method for harbor machinery

Abstract

The invention belongs to the technical field of measuring equipment, and particularly relates to a motor detection system and method for harbor machinery, and the system comprises a controller, a magnetic core, a magnetic field detection unit, and a bias magnetic field output unit. When the magnetic core is sleeved on the detected lead, the controller is configured to detect a magnetic field intensity change curve through the magnetic field detection unit; when the magnetic field intensity change curve is abnormal, the controller is further configured to drive the bias magnetic field output unit to output a corresponding bias magnetic field so as to adjust the magnetic field intensity change curve; the bias magnetic field output unit is arranged on the outer side of the magnetic core, so that the influence of an external magnetic field on the magnetic core magnetic conductivity can be restrained, namely the bias magnetic field is generated through the bias magnetic field output unit, a magnetic core working point is stabilized in a magnetization curve linear region, and therefore the influence of the external magnetic field on the magnetic core magnetic conductivity is eliminated; the magnetic field intensity change curve is accurately measured so as to truly reflect the insulation performance of the motor.

Description

Technical Field

[0001] This invention belongs to the field of measuring equipment technology, specifically relating to a device for measuring electrical variables, and more particularly to a testing system and method for motors used in port machinery. Background Technology

[0002] Insulation testing is required for motors used in port machinery. In the field of motor insulation testing, insulation testing is performed on the wiring of the motor using testing equipment (precision magnetic field sensors, high-frequency current transformers, etc.). The motor generates a power frequency magnetic field when it is working, and external equipment (transformers, etc.) also generate magnetic fields. That is, the external magnetic field will affect the accuracy of the testing equipment in measuring the magnetic field strength of the conductor being tested, resulting in inaccurate motor insulation testing.

[0003] Currently, existing testing equipment uses specific testing coils based on motor power to overcome the influence of external magnetic fields. However, this method cannot adapt to insulation testing of motors with different power ratings, resulting in poor compatibility.

[0004] Therefore, there is an urgent need to develop a new testing system and method for motors used in port machinery to solve the technical problem that testing equipment cannot adapt to insulation testing of motors with different power ratings.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of the present application concept, and therefore, the above description is not considered to constitute prior art information. Summary of the Invention

[0006] This disclosure provides at least one testing system and method for motors used in port machinery.

[0007] In a first aspect, embodiments of this disclosure provide a motor testing system for port machinery, comprising: a controller, a magnetic core, a magnetic field detection unit, and a bias magnetic field output unit; wherein the magnetic field detection unit and the bias magnetic field output unit are respectively located outside the magnetic core, and the magnetic field detection unit and the bias magnetic field output unit are respectively electrically connected to the controller; when the magnetic core is fitted onto the conductor under test, the controller is configured to detect the magnetic field intensity change curve through the magnetic field detection unit; and when the magnetic field intensity change curve is abnormal, the controller is further configured to drive the bias magnetic field output unit to output a corresponding bias magnetic field to change the magnetic field direction of the external magnetic field, i.e., guide the external magnetic field to avoid the magnetic field detection unit, thereby adjusting the magnetic field intensity change curve.

[0008] In one alternative implementation, anomalies in the magnetic field strength change curve include: the magnetic field strength value in the magnetic field strength change curve reaching the detection upper limit, fluctuating, or undergoing a reverse abrupt change.

[0009] In one optional embodiment, the magnetic field detection unit includes: a detection coil; the detection coil is wound on a magnetic core and is electrically connected to a controller; the controller is configured to detect the magnetic field strength change curve through the detection coil, and when the magnetic field strength change curve is abnormal, the controller is further configured to drive a bias magnetic field output unit to output a corresponding bias magnetic field.

[0010] In one optional embodiment, the bias magnetic field output unit includes: a first bias magnetic field output coil and a second bias magnetic field output coil; the first bias magnetic field output coil and the second bias magnetic field output coil are respectively wound on a magnetic core, the detection coil is located between the first bias magnetic field output coil and the second bias magnetic field output coil, and the first bias magnetic field output coil and the second bias magnetic field output coil are electrically connected to the controller; when the magnetic field strength change curve is abnormal, the controller is configured to drive the first bias magnetic field output coil and the second bias magnetic field output coil to output corresponding bias magnetic fields respectively.

[0011] In one optional implementation, when the magnetic field strength value in the magnetic field strength change curve reaches the detection upper limit, the controller is configured to drive the first bias magnetic field output coil and the second bias magnetic field output coil to output a changing bias magnetic field, that is, the magnetic field strength of the bias magnetic field decreases according to a first set value until the magnetic field strength value in the magnetic field strength change curve is less than the detection upper limit, and the magnetic field strength change curve tends to be a straight line.

[0012] In one optional implementation, when the magnetic field strength value in the magnetic field strength change curve fluctuates, the controller is configured to drive the first bias magnetic field output coil and the second bias magnetic field output coil to output a changing bias magnetic field, that is, the magnetic field strength of the bias magnetic field increases or decreases according to a second set value until the magnetic field strength change curve tends to be a straight line.

[0013] In one optional implementation, when the magnetic field strength value in the magnetic field strength change curve changes abruptly in the opposite direction, the controller is configured to drive the first bias magnetic field output coil and the second bias magnetic field output coil to output a changing bias magnetic field, that is, the magnetic field strength of the bias magnetic field increases according to a third set value, and after the bias magnetic field output by the first bias magnetic field output coil and the second bias magnetic field output coil changes at least three times, the magnetic field strength value in the magnetic field strength change curve shows abrupt reversal, and the controller determines that the power supply of the first bias magnetic field output coil and the second bias magnetic field output coil is reversed.

[0014] Secondly, this disclosure also provides a method for testing the insulation of a motor using the aforementioned testing system for motors used in port machinery, comprising: setting a magnetic field detection unit and a bias magnetic field output unit on the outside of a magnetic core; placing the magnetic core on the conductor to be tested, and a controller detecting the magnetic field strength change curve through the magnetic field detection unit; when the magnetic field strength change curve is abnormal, the controller drives the bias magnetic field output unit to output a corresponding bias magnetic field to adjust the magnetic field strength change curve.

[0015] Thirdly, embodiments of this disclosure also provide a non-transitory readable storage medium having a computer program / instructions stored thereon, which, when executed by a processor, implements the steps of the above-described method.

[0016] Fourthly, embodiments of this disclosure also provide a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of the above-described method.

[0017] The beneficial effect of this invention is that by setting a bias magnetic field output unit on the outside of the magnetic core, this invention can suppress the influence of the external magnetic field on the magnetic permeability of the magnetic core. That is, by generating a bias magnetic field through the bias magnetic field output unit, the operating point of the magnetic core is stabilized in the linear region of the magnetization curve, thereby eliminating the influence of the external magnetic field on the magnetic permeability of the magnetic core and realizing accurate measurement of the magnetic field strength change curve to truly reflect the insulation performance of the motor.

[0018] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention are realized and obtained through the structures particularly pointed out in the description and the drawings.

[0019] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, preferred embodiments are described below in detail with reference to the accompanying drawings. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 An exploded view of a port machinery motor detection system provided in an embodiment of this disclosure;

[0022] Figure 2 This is a structural diagram of a port machinery motor testing system provided in an embodiment of the present disclosure;

[0023] Figure 3 A schematic block diagram of a port machinery motor testing system provided in this embodiment of the present disclosure;

[0024] Figure 4 A schematic diagram illustrating a port machinery motor detection system that guides an external magnetic field to avoid a magnetic field detection unit, as provided in an embodiment of this disclosure;

[0025] Figure 5 This is a schematic diagram illustrating the effect of the bias magnetic field on the stability of the conductivity provided in the embodiments of this disclosure.

[0026] In the picture:

[0027] 1. Magnetic core; 2. Magnetic field detection unit; 21. Detection coil; 3. Bias magnetic field output unit; 31. First bias magnetic field output coil; 32. Second bias magnetic field output coil; 4. Support. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The terminology used herein is for the purpose of describing specific exemplary configurations only and is not intended to be limiting. As used herein, the singular articles “a,” “an,” and “the” may also be intended to include plural forms unless otherwise clearly stated herein. The terms “comprising,” “including,” and “having” are inclusive and thus specify the presence of features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein should not be construed as requiring them to be performed in the specific order discussed or shown, unless specifically identified as such. Additional or alternative steps may be employed.

[0030] As used herein, the phrases “in one embodiment,” “according to one embodiment,” “in some embodiments,” etc., generally refer to the fact that a particular feature, structure, or characteristic following the phrase can be included in at least one embodiment of this disclosure. Therefore, a particular feature, structure, or characteristic can be included in more than one embodiment of this disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, the terms “example,” “exemplary,” etc., are used to “serve as an example, instance, or illustration.” Any implementation, aspect, or design described herein as “example” or “exemplary” is not necessarily to be construed as preferred or superior to other implementations, aspects, or designs. Rather, the use of the terms “example,” “exemplary,” etc., is intended to present concepts in a specific manner.

[0031] Research has found that in the field of insulation testing of low-voltage motors (below 800V), insulation testing of the circuits on the motor is carried out by testing equipment (precision magnetic field sensors, high-frequency current transformers, etc.). The testing equipment has extremely high requirements for the stability of magnetic permeability. The stability of the magnetic permeability of the magnetic core in the testing equipment directly determines the testing accuracy. Fluctuations in the magnetic permeability of the magnetic core will lead to signal conversion errors, and in severe cases, even cause testing distortion.

[0032] However, the operation of the motor generates a power frequency magnetic field, and external equipment (such as transformers) also generates a magnetic field. The permeability of ferromagnetic materials will change nonlinearly with the change of magnetic field strength. That is, the external magnetic field will affect the permeability of the magnetic core in the detection equipment, and thus affect the abnormality of the magnetic field strength change curve detected by the detection equipment.

[0033] Based on the above research, this disclosure provides a testing system, testing method, readable storage medium, and program product for motors used in port machinery. After detecting an abnormal magnetic field intensity change curve, the influence of the external magnetic field on the magnetic permeability of the magnetic core can be suppressed by setting a bias magnetic field output unit on the outside of the magnetic core. That is, the bias magnetic field output unit generates a bias magnetic field to stabilize the operating point of the magnetic core in the linear region of the magnetization curve, thereby eliminating the influence of the external magnetic field on the magnetic permeability of the magnetic core and realizing accurate measurement of the magnetic field intensity change curve to truly reflect the insulation performance of the motor.

[0034] The shortcomings of the above solutions are the result of the inventor's practical experience and careful research. Therefore, the discovery process of the above problems and the solutions proposed in this disclosure below should be considered as the inventor's contribution to this disclosure.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0037] like Figures 1 to 5 As shown, at least one embodiment provides a motor testing system for port machinery, comprising: a controller, a magnetic core 1, a magnetic field detection unit 2, and a bias magnetic field output unit 3; wherein the magnetic field detection unit 2 and the bias magnetic field output unit 3 are respectively located outside the magnetic core 1, and the magnetic field detection unit 2 and the bias magnetic field output unit 3 are respectively electrically connected to the controller; when the magnetic core 1 is fitted onto the conductor under test, the controller is configured to detect the magnetic field intensity change curve through the magnetic field detection unit 2; and when the magnetic field intensity change curve is abnormal, the controller is further configured to drive the bias magnetic field output unit 3 to output a corresponding bias magnetic field to change the magnetic field direction of the external magnetic field, that is, to guide the external magnetic field to avoid the magnetic field detection unit 2, thereby adjusting the magnetic field intensity change curve.

[0038] Specifically, please refer to Figure 1 The central axis of magnetic core 1 is parallel to the direction of the magnetic field of the conductor being tested (deviation ≤ 1°) to avoid the coupling efficiency decreasing due to the deviation of the magnetic field direction.

[0039] Specifically, please refer to Figure 1 The magnetic core 1 should be kept at a distance of more than 5mm from surrounding metal objects (such as iron plates or copper pillars) to prevent metal eddy currents from interfering with the magnetic field distribution.

[0040] In at least one embodiment, by setting a bias magnetic field output unit 3 on the outside of the magnetic core 1, the influence of the external magnetic field on the permeability of the magnetic core 1 can be suppressed. That is, by generating a bias magnetic field through the bias magnetic field output unit 3, the operating point of the magnetic core 1 is stabilized in the linear region of the magnetization curve, thereby eliminating the influence of the external magnetic field on the permeability of the magnetic core 1 and realizing accurate measurement of the magnetic field strength change curve to truly reflect the insulation performance of the motor.

[0041] Specifically, please refer to Figure 5 Without a bias magnetic field, the permeability of core 1 will fluctuate after an external magnetic field is introduced. However, after a bias magnetic field is set, the permeability of core 1 can remain stable even if an external magnetic field is introduced.

[0042] Specifically, the BH curve is the core curve describing the magnetization characteristics of magnetic materials (such as magnetic core 1), where: H (magnetic field strength): is the externally applied "magnetizing force," measured in amperes per meter (A / m), generated by the current flowing through the coil of magnetic core 1. Simply put, the larger the current, the larger H; B (magnetic flux density): is the "magnetic field strength" generated inside magnetic core 1 after magnetization, measured in tesla (T), reflecting the actual magnetic flux stored in magnetic core 1 (magnetic flux Φ = B × S, where S is the cross-sectional area of ​​magnetic core 1). Initial segment (linear region): When H is small, B increases approximately proportionally with H (B ≈ μH, μ is the permeability, which is basically constant at this point), and the curve is close to a straight line. Saturation segment: When H increases to a certain extent, the growth of B becomes slow, and eventually it almost no longer increases with H (called "magnetic saturation"), at which point μ decreases sharply. Hysteresis Loop: For alternating magnetic fields (such as AC excitation), the change in B lags behind the change in H, forming a closed "hysteresis loop," but the core characteristics can still be referenced from its main curve (the upper half of the maximum hysteresis loop). The operating point of core 1 refers to the (H0, B0) coordinate point corresponding to core 1 under actual operating conditions. That is, the magnetic field strength H0 generated by the current (DC or AC) in the coil corresponds to the magnetic induction intensity B0 generated in core 1. For an inductor core 1, when a current I flows through the coil, it generates H0, and the corresponding B0 is on the BH curve; this point is the operating point under that state. The core purpose is to ensure the stable and linear operating characteristics of core 1, avoiding performance degradation due to nonlinearity. The specific reasons are as follows: ensuring stable device parameters. In the linear region, the permeability μ is basically constant, therefore device parameters dependent on μ (such as inductance L = μN²S / L0, the magnetizing inductance of a transformer, etc.) will remain stable. If the operating point enters the saturation region, μ drops sharply, and the inductance will suddenly decrease, leading to abnormal circuit operation (such as filter inductor failure or transformer excitation current surge). Reducing signal distortion: For devices processing alternating signals (such as audio transformers and high-frequency inductors), if the operating point is in the nonlinear region (such as near saturation), the nonlinear relationship between B and H will cause output signal distortion (generating harmonics). In the linear region, B and H are approximately proportional, and the signal can be linearly amplified or transmitted. Avoiding increased power consumption: If the operating point enters the nonlinear region of the hysteresis loop (especially the saturation region), hysteresis loss (energy loss due to the hysteresis loop area) will increase sharply, causing core 1 to heat up, efficiency to decrease, or even burn out.

[0043] In at least one embodiment, please refer to Figure 1 , Figure 3 The magnetic field detection unit 2 includes: a detection coil 21; the detection coil 21 is wound on the magnetic core 1 and is electrically connected to the controller; the controller is configured to detect the magnetic field strength change curve through the detection coil 21, and when the magnetic field strength change curve is abnormal, the controller is also configured to drive the bias magnetic field output unit 3 to output the corresponding bias magnetic field.

[0044] Specifically, please refer to Figure 1 The detection coil 21 is wound on the outside of the first bias magnetic field output coil 31 and on the inside of the second bias magnetic field output coil 32, and the three are arranged concentrically.

[0045] Specifically, please refer to Figure 1 A 0.1mm thick polyimide film (insulating and high temperature resistant) is placed between the detection coil 21 and the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 to ensure electrical isolation (withstand voltage ≥500V).

[0046] Specifically, please refer to Figure 1 The detection coil 21 is double-wound with 200 turns, and the winding direction is perpendicular to the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 (to reduce the induction of the DC component of the bias magnetic field). The outer diameter of the detection coil 21 is ≤32mm (to avoid exceeding the range of the shielding shell).

[0047] Specifically, please refer to Figure 1 The leads of the detection coil 21, the first bias magnetic field output coil 31, and the second bias magnetic field output coil 32 are led out at 90° to reduce electromagnetic interference between the leads.

[0048] In at least one embodiment, please refer to Figure 1 , Figure 3 The bias magnetic field output unit 3 includes: a first bias magnetic field output coil 31 and a second bias magnetic field output coil 32; the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 are respectively wound on the magnetic core 1, the detection coil 21 is located between the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32, and the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 are electrically connected to the controller; when the magnetic field strength change curve is abnormal, the controller is configured to drive the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 to output the corresponding bias magnetic field respectively.

[0049] Specifically, please refer to Figure 4 , Figure 4 The dashed line represents the spike formed by the external magnetic field before it is guided by the bias magnetic field, which interferes with the detection magnetic field generated by the innermost detection coil 21, causing an abnormality in the magnetic field strength change curve. At this time, the controller drives the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 to output the corresponding bias magnetic fields, i.e. Figure 4 The solid line in the middle circle represents the bias magnetic field, which in turn compresses the external magnetic field to expand outward, forming a magnetic field like... Figure 4The outermost solid line portion of the external magnetic field, i.e. the bias magnetic field, can change the direction of the external magnetic field, thereby guiding the external magnetic field to avoid the detection magnetic field generated by the detection coil 21, and thus ensuring that the detection coil 21 is not disturbed by the external magnetic field.

[0050] Specifically, please refer to Figure 1 The first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 are evenly distributed along the axial direction of the magnetic core 1, covering the entire length (5mm) of the magnetic core 1. The edges of the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 are aligned with the two ends of the magnetic core 1 (deviation ≤0.5mm).

[0051] Specifically, please refer to Figure 1 The first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 are wound with 500 turns in a single layer, with the turns tightly fitted together (gap ≤ 0.05mm). After winding, they are fixed with epoxy resin to ensure that the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 do not slide relative to the magnetic core 1.

[0052] Specifically, please refer to Figure 1 The leads of the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 are led out from the side of the magnetic core 1 (to avoid obstructing the winding area of ​​the detection coil 21), and the lead length is 150mm (to facilitate connection to a constant current source).

[0053] Specifically, the bias magnetic field strength H output by the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 偏置 The linear region of core 1 needs to be matched, i.e., H. 偏置 = (N*I) / L; H 偏置 The units are A / m; N is the number of coil turns; I is the bias current, in A; L is the magnetic circuit length of core 1, in m.

[0054] Specifically, the magnetic core 1 is made of permalloy and ferrite, and its magnetization curve exhibits typical nonlinear characteristics: in the initial magnetic neutral state (H=0, B=0), as the external magnetic field H (magnetic field strength, unit A / m, i.e., ampere / meter, characterizing the magnetomotive force per unit length) increases, the magnetic induction intensity B (unit T, tesla) first increases slowly (OA segment), then rises rapidly (AB segment), and finally tends to saturate (after point C).

[0055] Specifically, taking the commonly used permalloy 1J85 as an example, its saturation magnetic flux density is about 0.8T, and the magnetic field strength in the linear working region is 50-150A / m. Within this range, the permeability μ is basically constant (the rate of change is <1%), which is the ideal working range.

[0056] Specifically, core 1 requires a permalloy 1J85, a toroidal structure, and a magnetic circuit length of 0.07m; the target bias magnetic field is 100A / m (Ampere / meter, midpoint of the linear region); the coil parameters are 500 turns, 0.1mm (millimeters, diameter of enameled wire) enameled wire (current carrying capacity meets requirements).

[0057] Specifically, the bias current output by the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 is calculated as follows: I 偏置 =H 偏置 • L / N = (100 × 0.07) / 500 = 0.014 A = 14 mA (mA is milliampere, 1 mA = 0.001 A, the operating current of the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32).

[0058] Supporting verification: The total length of the coil is approximately 47m (500×π×30mm), the resistance of the copper wire is approximately 41Ω (Ω is ohms, representing the conductivity of the coil), the power consumption is approximately 0.008W (W is watts, representing the power level), the heat generation is negligible, and the stability requirements are met.

[0059] In at least one embodiment, anomalies in the magnetic field strength change curve include: the magnetic field strength value in the magnetic field strength change curve reaching the detection upper limit, fluctuating, or undergoing a reverse abrupt change.

[0060] In at least one embodiment, when the magnetic field strength value in the magnetic field strength change curve reaches the detection upper limit value, the controller is configured to drive the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 to output a changing bias magnetic field, that is, the magnetic field strength of the bias magnetic field decreases according to a first set value until the magnetic field strength value in the magnetic field strength change curve is less than the detection upper limit value and the magnetic field strength change curve tends to be a straight line.

[0061] Specifically, the detection upper limit of the magnetic field strength value in the magnetic field strength change curve is as follows: the detection upper limit of the magnetic field strength change curve is 15A / m, that is, the top of the 15A / m signal waveform is flattened (clipping), and the amplitude no longer increases linearly with the increase of magnetic field. When the top flattening occurs for two consecutive cycles (flattening ratio >8%), it is determined that the permeability is saturated. The bias current of the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 is gradually reduced (2mA once), such as from 14mA to 12mA. After each adjustment, two cycles are observed until the waveform returns to smoothness.

[0062] In at least one embodiment, when the magnetic field strength value in the magnetic field strength change curve fluctuates, the controller is configured to drive the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 to output a changing bias magnetic field, that is, the magnetic field strength of the bias magnetic field increases or decreases according to a second set value until the magnetic field strength change curve tends to be a straight line.

[0063] Specifically, after the magnetic field strength value in the magnetic field strength change curve fluctuates, the following occurs: a small signal amplitude fluctuation of 5A / m (0.5% standard), unstable permeability, fine adjustment of the bias current of the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 (0.5mA once), and resampling after each adjustment until the fluctuation is ≤±0.5%.

[0064] In at least one embodiment, when the magnetic field strength value in the magnetic field strength change curve changes abruptly in the opposite direction, the controller is configured to drive the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 to output a changing bias magnetic field, that is, the magnetic field strength of the bias magnetic field increases according to a third set value, and after the bias magnetic field output by the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 changes at least three times, the magnetic field strength value in the magnetic field strength change curve changes abruptly in the opposite direction, and the controller determines that the power supply of the first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 is reversed.

[0065] Specifically, the reverse sudden change in the magnetic field strength value in the magnetic field strength change curve is as follows: the output signal is opposite to the measured magnetic field. For example, when H increases, the output amplitude decreases, and signals of different intensities maintain an inverse relationship, that is, the bias magnetic field is reversed. The first bias magnetic field output coil 31 and the second bias magnetic field output coil 32 are input with an increasing magnetic field, such as from 5A / m to 10A / m to 15A / m, and the amplitude is recorded at 10s intervals. When three consecutive measurements show a decreasing trend, the direction is determined to be incorrect. The coil power input is changed to verify whether the output has recovered to a positive linear relationship.

[0066] Specifically, please refer to Figure 1 , Figure 2 The magnetic core 1 adopts a ring structure with an outer diameter of 30mm, an inner diameter of 15mm, and a thickness of 5mm. During installation, it needs to be fixed on a non-magnetic bracket 4 (such as a plastic bracket 4).

[0067] Based on the same technical concept, at least one embodiment also provides a motor insulation testing method using the port machinery motor testing system described above, which includes: setting a magnetic field detection unit 2 and a bias magnetic field output unit 3 on the outside of the magnetic core 1; placing the magnetic core 1 on the conductor to be tested, and the controller detecting the magnetic field intensity change curve through the magnetic field detection unit 2; when the magnetic field intensity change curve is abnormal, the controller drives the bias magnetic field output unit 3 to output a corresponding bias magnetic field to adjust the magnetic field intensity change curve.

[0068] Based on the same technical concept, at least one embodiment also provides a non-transitory readable storage medium having a computer program / instructions stored thereon, which, when executed by a processor, implements the steps of the above method.

[0069] Based on the same technical concept, at least one embodiment also provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the steps of the above-described method.

[0070] In summary, this invention can suppress the influence of external magnetic fields on the permeability of magnetic cores by setting a bias magnetic field output unit on the outside of the magnetic core. That is, the bias magnetic field output unit generates a bias magnetic field, which stabilizes the operating point of the magnetic core in the linear region of the magnetization curve, thereby eliminating the influence of external magnetic fields on the permeability of the magnetic cores and realizing accurate measurement of the magnetic field strength change curve to truly reflect the insulation performance of the motor.

[0071] The disclosures and other solutions, examples, embodiments, modules, and functional operations described in this document can be implemented in digital electronic circuits, or computer software, firmware, or hardware, including the structures disclosed in this document and their structural equivalents, or combinations thereof. The disclosures and other embodiments can be implemented as one or more computer program products, i.e., one or more modules of computer program instructions encoded on a tangible and non-volatile computer-readable medium for execution by a data processing apparatus or for controlling the operation of the data processing apparatus. The computer-readable medium can be a machine-readable storage device, a machine-readable storage substrate, a storage device, a material composition that influences machine-readable propagated signals, or one or more of these. The terms "data processing unit" or "data processing apparatus" include all means, devices, and machines for processing data, including, for example, programmable processors, computers, or multiprocessors or computer groups. In addition to hardware, the apparatus may also include code that creates an execution environment for a computer program, such as code constituting processor firmware, a protocol stack, a database management system, an operating system, or combinations thereof. The propagated signals are artificially generated signals, such as machine-generated electrical, optical, or electromagnetic signals, which are generated to encode information for transmission to a suitable receiver device.

[0072] Computer programs (also known as programs, software, software applications, scripts, or code) can be written in any programming language (including compiled or interpreted languages) and can be deployed in any form, including as standalone programs or as modules, components, subroutines, or other units suitable for use in a computing environment. A computer program does not necessarily correspond to a file in a file system. A program can be stored in a portion of a file that holds other programs or data (e.g., one or more scripts stored in a markup language document), in a single file dedicated to that program, or in multiple coordinating files (e.g., a file storing one or more modules, subroutines, or portions of code). Computer programs can be deployed and executed on one or more computers located at a single site or distributed across multiple sites interconnected by a communication network.

[0073] The processing and logic flows described in this document can be executed by one or more programmable processors that execute one or more computer programs to perform functions by manipulating input data and generating outputs. The processing and logic flows can also be executed by special-purpose logic circuitry, and the devices can be implemented as special-purpose logic circuitry, such as FPGAs (Field-Programmable Gate Arrays) or ASICs (Application-Specific Integrated Circuits).

[0074] For example, processors suitable for executing computer programs include general-purpose and special-purpose microprocessors, as well as any one or more of any type of digital computer. Typically, the processor receives instructions and data from read-only memory or random access memory, or both. The basic components of a computer are a processor that executes instructions and one or more storage devices that store the instructions and data. Typically, a computer will also include one or more mass storage devices for storing data, such as magnetic disks, magneto-optical disks, or optical disks, or operatively coupled to receive data from or transfer data to mass storage devices, or both. However, a computer does not necessarily have such devices. Computer-readable media suitable for storing computer program instructions and data include all forms of non-volatile memory, media, and memory devices, including, for example, semiconductor memory devices such as erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), and flash memory devices; magnetic disks, such as internal hard disks or removable disks; magneto-optical disks; and optical disc read-only memory (CD ROM) and digital versatile optical disc read-only memory (DVD-ROM). The processor and memory may be supplemented by dedicated logic circuitry or incorporated into dedicated logic circuitry.

[0075] While this patent document contains numerous details, it should not be construed as limiting the scope of any invention or claim, but rather as a description of features of specific embodiments of a particular invention. Certain features described in the context of individual embodiments may also be implemented in combination in a single embodiment. Conversely, various functions described in the context of a single embodiment may also be implemented individually in multiple embodiments, or in any suitable sub-combination. Furthermore, although the foregoing features may be described as functioning in certain combinations, or even initially claimed to be so, in certain circumstances, one or more features from a combination of claims may be removed from the combination, and a combination of claims may refer to a sub-combination or a variation of a sub-combination.

[0076] Similarly, although the operations are described in a specific order in the accompanying drawings, this should not be construed as requiring the specific order or sequence shown to perform such operations, or all the described operations, in order to obtain the desired result. Furthermore, the separation of various system components in the embodiments of this patent document should not be construed as requiring such separation in all embodiments.

[0077] Only some implementations and examples are described; other implementations, enhancements, and variations can be made based on the content described and illustrated in this patent document.

[0078] When no intermediate component exists other than a line, trace, or other medium between the first and second components, the first component is directly coupled to the second component. When an intermediate component other than a line, trace, or other medium exists between the first and second components, the first component is indirectly coupled to the second component. The term "coupling" and its variations include direct coupling and indirect coupling. Unless otherwise stated, the term "about" is used to mean a range including upper and lower 10% of the value.

[0079] While several embodiments are provided in this disclosure, it should be understood that the disclosed systems and methods may be embodied in many other specific forms without departing from the spirit or scope of this disclosure. The present examples are intended to be illustrative rather than restrictive and are not limited to the details given. For example, various elements or components may be combined or integrated into another system, or certain features may be omitted or not implemented.

[0080] In the several embodiments provided herein, it should be understood that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0081] Furthermore, without departing from the scope of this disclosure, the discrete or individual technologies, systems, subsystems, and methods described and illustrated in the various embodiments may be combined or integrated with other systems, modules, technologies, or methods. Other items shown or discussed as coupled may be directly connected or indirectly coupled or communicated via some interface, device, or intermediate component in an electrical, mechanical, or other manner. Those skilled in the art can identify other examples of changes, substitutions, and modifications without departing from the spirit and scope of this disclosure.

Claims

1. A motor testing system for port machinery, characterized in that, include: Controller, magnetic core, magnetic field detection unit, and bias magnetic field output unit; in The magnetic field detection unit and the bias magnetic field output unit are located on the outside of the magnetic core, and the magnetic field detection unit and the bias magnetic field output unit are electrically connected to the controller. When the magnetic core is fitted onto the conductor being tested, the controller is configured to detect the change curve of the magnetic field strength through the magnetic field detection unit; as well as When the magnetic field intensity change curve is abnormal, the controller is also configured to drive the bias magnetic field output unit to output the corresponding bias magnetic field, so as to change the magnetic field direction of the external magnetic field, that is, to guide the external magnetic field to avoid the magnetic field detection unit, thereby adjusting the magnetic field intensity change curve.

2. The port machinery motor testing system as described in claim 1, characterized in that, Abnormal magnetic field strength change curves include: magnetic field strength values ​​reaching the upper limit of detection, fluctuations, or sudden reversals in the magnetic field strength change curve.

3. The port machinery motor testing system as described in claim 2, characterized in that, The magnetic field detection unit includes: a detection coil; The detection coil is wound on a magnetic core and is electrically connected to the controller; The controller is configured to detect the magnetic field strength change curve through the detection coil, and when the magnetic field strength change curve is abnormal, the controller is also configured to drive the bias magnetic field output unit to output the corresponding bias magnetic field.

4. The port machinery motor testing system as described in claim 3, characterized in that, The bias magnetic field output unit includes: a first bias magnetic field output coil and a second bias magnetic field output coil; The first bias magnetic field output coil and the second bias magnetic field output coil are respectively wound on the magnetic core, the detection coil is located between the first bias magnetic field output coil and the second bias magnetic field output coil, and the first bias magnetic field output coil and the second bias magnetic field output coil are electrically connected to the controller; When the magnetic field strength change curve is abnormal, the controller is configured to drive the first bias magnetic field output coil and the second bias magnetic field output coil to output the corresponding bias magnetic field respectively.

5. The port machinery motor testing system as described in claim 4, characterized in that, When the magnetic field strength value in the magnetic field strength change curve reaches the detection upper limit, the controller is configured to drive the first bias magnetic field output coil and the second bias magnetic field output coil to output a changing bias magnetic field, that is, the magnetic field strength of the bias magnetic field decreases according to the first set value until the magnetic field strength value in the magnetic field strength change curve is less than the detection upper limit and the magnetic field strength change curve tends to be a straight line.

6. The port machinery motor testing system as described in claim 4, characterized in that, When the magnetic field strength value fluctuates in the magnetic field strength change curve, the controller is configured to drive the first bias magnetic field output coil and the second bias magnetic field output coil to output a changing bias magnetic field, that is, the magnetic field strength of the bias magnetic field increases or decreases according to a second set value until the magnetic field strength change curve tends to be a straight line.

7. The port machinery motor testing system as described in claim 4, characterized in that, When the magnetic field strength value in the magnetic field strength change curve changes abruptly in the opposite direction, the controller is configured to drive the first bias magnetic field output coil and the second bias magnetic field output coil to output a changing bias magnetic field. That is, the magnetic field strength of the bias magnetic field increases according to a third set value. After the bias magnetic field output by the first bias magnetic field output coil and the second bias magnetic field output coil changes at least three times, the magnetic field strength value in the magnetic field strength change curve changes abruptly in the opposite direction. The controller then determines that the power supply of the first bias magnetic field output coil and the second bias magnetic field output coil is reversed.

8. A method for testing motor insulation using a testing system for port machinery motors as described in any one of claims 1-7, characterized in that, include: A magnetic field detection unit and a bias magnetic field output unit are installed on the outside of the magnetic core; The magnetic core is placed on the conductor being tested, and the controller detects the change curve of the magnetic field strength through the magnetic field detection unit. When the magnetic field intensity change curve is abnormal, the controller drives the bias magnetic field output unit to output the corresponding bias magnetic field to adjust the magnetic field intensity change curve.

9. A non-transitory readable storage medium storing computer programs / instructions thereon, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the method of claim 8.

10. A computer program product comprising a computer program / instructions, characterized in that, When the computer program / instructions are executed by the processor, they implement the steps of the method of claim 8.

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