A measuring system, method, controller and medium for stator core iron loss

Abstract

The present invention discloses a measurement system, method, controller and medium for stator core iron loss. The measurement system for stator core iron loss includes: a stator core unit to be measured and an iron loss measurement controller. The stator core unit to be measured includes a prefabricated winding, a target magnetic bridge and a stator core tooth yoke unit; the prefabricated winding includes an exciting winding and a measuring winding; the target magnetic bridge is fixed at the tail ends of two tooth parts of the stator core tooth yoke unit, and the target magnetic bridge and the stator core tooth yoke unit form a closed magnetic circuit; the exciting winding and the measuring winding pass through the yoke part of the stator core tooth yoke unit and are installed on the stator core tooth yoke unit and / or the target magnetic bridge; the iron loss measurement controller is used to obtain the iron loss measurement related data of the stator core unit to be measured, and determine the iron loss of the stator core to be measured according to the iron loss measurement related data and the equivalent method of ring specimens. The technical solution of the embodiment of the present invention can accurately measure the iron loss of the stator core.

Description

Technical Field

[0001] The present invention relates to the technical field of iron loss measurement, and particularly to a measurement system, method, controller and medium for the iron loss of a stator core. Background Art

[0002] The iron core is a core functional component in an automotive drive motor. The energy loss per unit mass of the iron core in an electromagnetic field is called the specific total loss (commonly referred to as iron loss in the industry, hereinafter all referred to as iron loss), and the iron loss of the iron core (especially the stator core) is a key indicator affecting the thermal efficiency of the motor. During the iron core processing, technological processes such as punching, stacking and riveting, and welding will have a significant adverse impact on the magnetic properties of the silicon steel sheet raw material, thereby greatly increasing the actual iron loss of the iron core compared with the design value, and affecting the actual thermal efficiency of the motor. Therefore, how to accurately measure the actual iron loss of the iron core is very crucial for improving the design accuracy and enhancing the thermal efficiency of the motor.

[0003] Currently, iron loss measurement is mainly carried out in the following three ways. The first way: Assemble the iron core into a complete motor assembly, and infer and calculate the stator iron loss through the method of reverse dragging test on the motor dynamometer bench. The advantage of this method is that it is closer to the actual working condition and can very accurately reflect the overall loss and overall energy efficiency of the motor. However, the disadvantages are also obvious. Since a complete set of motor systems and mechanical transmission systems are introduced, it is very difficult to accurately distinguish various losses (such as mechanical friction losses, etc.) of different components in the system. Therefore, the iron loss value still cannot be accurately obtained. At the same time, the test system is complex, costly, and time-consuming, and cannot meet the design improvement requirements.

[0004] The second way: Cut off the teeth of the stator core (or only remove the influence of this part by calculation when calculating the magnetic circuit length and sample mass), and only keep the yoke, and equivalent it to a large ring sample. Although this method is simple and easy to operate, it has two prominent defects. First, in the actual working condition, the stator teeth are a more critical magnetic circuit component of the iron core and should be the key object of measurement rather than the yoke. Even so, even for the yoke alone, due to the very large size specifications and mass of the entire yoke ring sample, limited by the current test equipment technology level, the test ranges of measurable magnetic field strength, frequency, etc. will be very small, far from meeting the measurement requirements under the rated working condition.

[0005] The third way: Use a thick cable or copper bar to replace the relatively complex test coil winding in the ring sample method, pass the cable / copper bar through the stator core, and conduct magnetic property and iron loss measurement with a large current. This method is usually used in iron core processing factories. Its advantage is that the operation is simple and fast, and the disadvantage is non-precise measurement, and only qualitative judgment of qualified or unqualified can be carried out, or simple quantitative comparison under limited conditions. Summary of the Invention

[0006] The present invention provides a measurement system, method, controller and medium for the iron loss of a stator core, so as to solve the problem that the existing iron loss measurement method cannot accurately measure the iron loss of the stator core.

[0007] According to an aspect of the present invention, there is provided a measurement system for the iron loss of a stator core, including: a stator core unit to be measured and an iron loss measurement controller, wherein,

[0008] The stator core unit to be measured includes a prefabricated winding, a target magnetic bridge and a stator core tooth yoke unit; the prefabricated winding includes an exciting winding and a measuring winding; the stator core tooth yoke unit includes a yoke part and two tooth parts of the stator core to be measured; the target magnetic bridge is fixed at the tail ends of the two tooth parts of the stator core tooth yoke unit, and the target magnetic bridge and the stator core tooth yoke unit form a closed magnetic circuit; the exciting winding and the measuring winding pass through the yoke part of the stator core tooth yoke unit and are installed on the stator core tooth yoke unit and / or the target magnetic bridge;

[0009] The iron loss measurement controller is configured to obtain the iron loss measurement related data of the stator core unit to be measured, and determine the iron loss of the stator core to be measured according to the iron loss measurement related data and the equivalent method of the toroidal specimen.

[0010] According to another aspect of the present invention, there is provided a method for measuring the iron loss of a stator core, including:

[0011] Determine the target geometric center line length of the stator core tooth yoke unit and the target magnetic bridge, and the lower limit value of the tooth part cross-sectional area of the stator core tooth yoke unit according to the iron loss measurement related data;

[0012] Determine the toroidal specimen loss data according to the target geometric center line length, the lower limit value of the tooth part cross-sectional area and the equivalent method of the toroidal specimen;

[0013] Determine the iron loss of the stator core to be measured according to the toroidal specimen loss data, the magnetic bridge material loss data and the mass of the stator core tooth yoke unit.

[0014] According to another aspect of the present invention, there is provided a controller, the controller includes:

[0015] At least one processor; and

[0016] A memory communicatively connected to the at least one processor; wherein,

[0017] The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for measuring the iron loss of the stator core according to any embodiment of the present invention.

[0018] According to another aspect of the present invention, there is provided a computer-readable storage medium storing computer instructions for causing a processor to implement the method for measuring the iron loss of a stator core according to any embodiment of the present invention when executed.

[0019] In the technical solution of the embodiment of the present invention, by fixing the target magnetic bridge at the tail ends of two tooth parts of the stator core tooth yoke unit, the target magnetic bridge and the stator core tooth yoke unit form a closed magnetic circuit, and the exciting winding and the measuring winding are passed through the yoke part of the stator core tooth yoke unit and installed on the stator core tooth yoke unit and / or the target magnetic bridge to obtain the stator core unit to be measured. Then, the iron loss measurement controller is used to obtain the iron loss measurement correlation data of the stator core unit to be measured, and further, according to the iron loss measurement correlation data and the equivalent method of the toroidal specimen, the iron loss of the stator core to be measured is determined. In the stator iron loss measurement system of this solution, the stator core tooth yoke unit samples from the stator core to be measured, retains the most critical tooth part performance, and can fully represent the overall performance of the stator core to be measured, being closer to the actual service conditions of the stator core to be measured. Moreover, this system has a wide measurement range, can cover various working conditions of the stator core to be measured, and has the advantages of simple, fast, good reproducibility in the measurement process and low test cost. It solves the problem that the existing iron loss measurement methods cannot accurately measure the iron loss of the stator core and can accurately measure the iron loss of the stator core.

[0020] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the present invention, nor is it used to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can obtain other drawings without creative efforts based on these drawings.

[0022] Figure 1 It is a schematic diagram of a measurement system for the iron loss of a stator core provided in Embodiment 1 of the present invention;

[0023] Figure 2 It is a flowchart of a method for measuring the iron loss of a stator core provided in Embodiment 1 of the present invention;

[0024] Figure 3 It shows a schematic structural diagram of an iron loss measurement controller that can be used to implement the embodiments of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] To enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0026] It should be noted that the terms "target" and the like in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to describe a specific order or sequence. It should be understood that such data used can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0027] Embodiment 1

[0028] Figure 1 It is a schematic diagram of a measurement system for stator core iron loss provided in Embodiment 1 of the present invention. Figure 1 Only one case where the exciting winding and the measuring winding are installed on the stator core tooth yoke unit is shown, and the exciting winding and the measuring winding in the prefabricated winding can pass through the yoke part of the stator core tooth yoke unit and be installed on the stator core tooth yoke unit and / or the target magnetic bridge.

[0029] As Figure 1 shown, the measurement system for stator core iron loss includes: a stator core unit to be measured and an iron loss measurement controller. Among them, the stator core unit to be measured may include a prefabricated winding, a target magnetic bridge and a stator core tooth yoke unit; the prefabricated winding may include an exciting winding and a measuring winding; the stator core tooth yoke unit may include a yoke part and two tooth parts of the stator core to be measured; the target magnetic bridge is fixed at the tail ends of the two tooth parts of the stator core tooth yoke unit, and the target magnetic bridge and the stator core tooth yoke unit form a closed magnetic circuit; the exciting winding passes through the yoke part of the stator core tooth yoke unit and is installed on one tooth part of the stator core tooth yoke unit; the measuring winding passes through the yoke part of the stator core tooth yoke unit and is installed on the other tooth part of the stator core tooth yoke unit; the iron loss measurement controller is used to obtain the iron loss measurement related data of the stator core unit to be measured and determine the iron loss of the stator core to be measured according to the iron loss measurement related data and the equivalent method of the toroidal specimen.

[0030] It can be understood that both the exciting winding and the measuring winding in the prefabricated winding can be placed on the target magnetic bridge; or, the exciting winding is installed on the target magnetic bridge, and the measuring winding is installed on the stator core unit to be measured (such as passing through the yoke part of the stator core tooth yoke unit and surrounding one tooth part on one side of the stator core tooth yoke unit). The exciting winding and the measuring winding can also be placed on an insulating skeleton.

[0031] Among them, the stator core unit to be measured can be a test sample to be tested composed of a prefabricated winding, a target magnetic bridge, and a stator core tooth yoke unit. The prefabricated winding can be a pre-set winding. Exemplarily, the coil is wound with enameled copper wire on an insulating skeleton to form a prefabricated winding. The target magnetic bridge can be a standardized magnetic bridge for fixing the tooth part of the stator core tooth yoke unit. Optionally, the material of the target magnetic bridge can be electrically pure iron, oriented silicon steel, amorphous soft magnetic alloy, or soft magnetic materials with high saturation magnetic density, high magnetic permeability, and low loss such as permalloy. The shape of the target magnetic bridge is C-shaped (or I-shaped or other shapes), and a dovetail groove is opened at the end for fixing the tooth part of the stator core tooth yoke unit. The stator core tooth yoke unit can be intercepted from the stator core to be measured and includes a test sample with two tooth parts and an intermediate yoke part in the stator core to be measured. Optionally, the unit thickness of the stator core tooth yoke unit can be arbitrarily selected according to the actual situation. For example, the unit thickness can be 10 mm, etc. The stator core to be measured can be a stator core that needs to estimate the iron loss of the stator core.

[0032] The iron loss measurement controller can be a device that determines the iron loss of the stator core to be measured based on the iron loss estimation result of the stator core unit to be measured. The iron loss measurement correlation data can be data describing the hardware characteristics of the stator core unit to be measured and is used to estimate the iron loss of the stator core to be measured. The ring sample equivalent method can be a method for testing the magnetic properties of ring samples. The ring sample equivalent method can include, but is not limited to, the equivalent method in GB / T 3658-2008.

[0033] In the embodiment of the present invention, before calculating the iron loss of the stator core to be measured by the iron loss measurement controller, the stator core unit to be measured needs to be configured first. Then, based on the iron loss measurement correlation data of the stator core unit to be measured and the ring sample equivalent method, a ring sample magnetic detection experiment is carried out on the stator core unit to be measured. Thus, according to the iron loss data measured in the experiment, the mass of the stator core unit to be measured, and the loss of the target magnetic bridge, the iron loss of the stator core to be measured is calculated.

[0034] In the technical solution of the embodiment of the present invention, by fixing the target magnetic bridge at the tail ends of two tooth parts of the stator core yoke unit, a closed magnetic circuit is formed by the target magnetic bridge and the stator core yoke unit, and the exciting winding and the measuring winding are passed through the yoke part of the stator core yoke unit and installed on the stator core yoke unit and / or the target magnetic bridge to obtain the stator core unit to be measured. Then, the iron loss measurement controller is used to obtain the iron loss measurement correlation data of the stator core unit to be measured, and further, according to the iron loss measurement correlation data and the equivalent method of the toroidal specimen, the iron loss of the stator core to be measured is determined. In the stator iron loss measurement system of this solution, the stator core yoke unit samples from the stator core to be measured, retains the most critical tooth part performance, can fully represent the overall performance of the stator core to be measured, is closer to the actual service condition of the stator core to be measured, and this system has a wide measurement range, can cover various working conditions of the stator core to be measured, has the advantages of simple, fast, good reproducibility in the measurement process and low test cost, solves the problem that the existing iron loss measurement method cannot accurately measure the iron loss of the stator core, and can accurately measure the iron loss of the stator core.

[0035] Embodiment 2

[0036] In an alternative embodiment of the present invention, the number of turns of the exciting winding can be determined based on the following formula:

[0037]

[0038] where N1 is the number of turns of the exciting winding, H max is the peak value of the measured magnetic field strength, l m is the magnetic path length value of the stator core yoke unit, I max is the peak value of the safe current of the enameled copper wire.

[0039] In an alternative embodiment of the present invention, the number of turns of the measuring winding can be determined based on the following formula:

[0040]

[0041] where N2 is the number of turns of the measuring winding, U max is the peak value of the measuring power supply voltage, J max is the maximum magnetic polarization intensity value of the stator core yoke unit, A m is the cross-sectional area of the stator core yoke unit, and f is the measuring power supply frequency.

[0042] In an alternative embodiment of the present invention, the two tooth parts in the stator core unit to be measured are two adjacent tooth parts in the stator core to be measured, or two non-adjacent tooth parts in the stator core to be measured.

[0043] In the embodiments of the present invention, two adjacent tooth portions in the stator core to be measured and the portion connecting the two tooth portions can be sampled to obtain a stator core unit to be measured. Alternatively, two non-adjacent tooth portions in the stator core to be measured and the portions corresponding to the two tooth portions respectively can be sampled and spliced to obtain a stator core unit to be measured.

[0044] Optionally, two non-adjacent tooth portions selected within 180° (which can be set by oneself) in the stator core to be measured and the portions corresponding to the two selected tooth portions can be sampled and spliced to obtain a stator core unit to be measured.

[0045] In an alternative embodiment of the present invention, the exciting winding and the measuring winding can be plug-in windings, and the plug-in windings are convenient for assembly and disassembly.

[0046] Correspondingly, the steps for measuring the iron loss of the stator core are as follows:

[0047] 1) First, standardize the prefabricated winding. According to the requirements of different detection ranges, make prefabricated windings with different numbers of turns. Determine the number of turns of the exciting winding according to and determine the number of turns of the measuring winding according to The exciting winding and the measuring winding can use enameled copper wires with circular or rectangular cross-sections.

[0048] For the exciting winding, the diameter specification or the maximum width of the enameled wire should not be greater than 3.0 mm. For the measuring winding, the diameter specification or the maximum width of the enameled wire should not be greater than 1.0 mm, and under the condition of meeting the measurement range, a thinner enameled wire should be selected as much as possible. The insulating skeleton should be made of plastic materials with a certain strength, heat resistance and insulation, and the material thickness should be as small as possible; under the condition of smoothly passing the tooth portion of the stator core tooth yoke unit, the gap between the insulating skeleton and the tooth portion should be as small as possible. The enameled copper wire should be closely wound on the skeleton, and if necessary, it can be fixed by injection molding with insulating paint.

[0049] 2) Determination of the loss data of the annular specimen

[0050] Regarding the closed loop formed by the "stator core tooth yoke unit" + "target magnetic bridge" as an equivalent annular specimen. According to the requirements of the measurement range, select a standardized "prefabricated winding" with an appropriate number of turns specification, and calculate the total loss value (annular specimen loss data) P of the whole measurement of the equivalent annular specimen according to the corresponding method in GB / T 3658-2008 c .

[0051] 3) Calculation of the loss of the stator core tooth yoke unit

[0052] P c(Si) = P c - P c(CQ)

[0053] Wherein, P c(Si) is the loss of the stator core tooth yoke unit; P c is the loss data of the toroidal specimen; P c(CQ) is the target magnetic bridge loss data.

[0054] Optionally, the target magnetic bridge loss data can be obtained by separately measuring after pre-making the magnetic bridge into a standard sample. In practical applications, through a large number of measurements in advance, the magnetic bridge material loss data can be made into a database or application manual for direct search and application.

[0055] 4) Calculation of the iron loss of the stator core tooth yoke unit

[0056] P s(Si) = P c(Si) / m (Si)

[0057] Wherein, P s(Si) is the iron loss of the stator core tooth yoke unit; m (Si) is the mass of the stator core tooth yoke unit.

[0058] 5) Calculation of the iron loss of the stator core to be measured

[0059] Taking the iron loss of the stator core tooth yoke unit as the iron loss of the stator core to be measured can accurately guide the design for optimization and improvement. For cases with higher accuracy requirements, the stator core tooth yoke units at multiple different positions can be measured, and their average iron loss can be taken as the iron loss of the stator core to be measured.

[0060] In a specific example, during the development of a certain type of motor, to verify the achievement of the iron loss design index, the iron loss under rated operating conditions of the stator core trial-produced A sample was measured using the solution of the present invention (test conditions: power supply frequency f = 400 Hz, magnetic polarization intensity J = 1.0 T). The specific process is as follows:

[0061] (1) Use wire cutting to cut out the stator core tooth yoke unit on the stator core trial-produced A sample as the sample to be tested. The sample parameters are as follows: thickness specification 10 mm, measured thickness h = 10.22 mm, weighed with an analytical balance (mass of the stator core tooth yoke unit m Si = 38.26 g), and obtain the geometric center line length L Si = 54.26 mm of the stator core tooth yoke unit according to the design drawing;

[0062] (2) Select an excitation winding with 100 turns and a measuring winding with 100 turns to form a prefabricated winding, and install it on the tooth part of the stator core tooth yoke unit in the manner as Figure 1 shown;

[0063] (3) Select the target magnetic bridge that matches the stator core tooth yoke unit. Magnetic bridge parameters: The material is pure electrical iron DT4C, and the mass m CQ = 56.24 g, and the length of the geometric center line L CQ = 32.62 mm.

[0064] (4) Assemble the above stator core tooth yoke unit, pre-wound winding, and standard magnetic bridge according to Figure 1 and carry out iron loss measurement according to the measuring equipment and methods in GB / T3658:

[0065] The first step: Obtain the equivalent toroidal specimen to measure the total loss value P of the whole c (According to the dimensions, weights and other parameters of the above components, combined with the voltage, current and other parameters obtained by testing according to the method of standard GB / T 3658, the loss power of the whole under the measurement conditions can be obtained according to the standard). For this case, under the conditions of power supply frequency f = 400 Hz and magnetic polarization intensity J = 1.0 T, the total loss value of the equivalent toroidal specimen measured for the whole is: P c = 1.658 W.

[0066] The second step: Based on P c(Si) = P c - P c(CQ) , calculate the loss P c(Si) value of the stator core tooth yoke unit. The loss power P c(CQ) of the target magnetic bridge under the measurement conditions can be obtained by looking up the table. = 1.072 W, so P c(Si) = 0.586 W.

[0067] The third step: Obtain the iron loss of the stator core tooth yoke unit: P s(Si) = P c(Si) / m (Si) .

[0068] Substitute the measurement parameters, and the iron loss of the trial-produced A sample of the stator core can be obtained as P s(Si) = 15.316 W / kg.

[0069] Result analysis: According to the design drawing, it is determined that the material used for the trial-produced A sample of the stator core is a certain non-oriented silicon steel with a nominal thickness of 0.25 mm, and the nominal value of the specific total loss of the raw material is P s(1.0 / 100)= 13.0 W / kg. In the motor simulation design, under the conditions of a power supply frequency of 400 Hz and a magnetic polarization intensity of 1.0 T, considering the process influence and safety factor, the iron loss index of this stator core is 14.88 W / kg. Compared with the measurement result of 15.316 W / kg, the deviation is 2.93%. Considering the various stresses such as stamping and assembly in the actual production process of the core, the magnetic properties generally will decline. This deviation is completely within the acceptable range of the design. By using the method of the present invention, the specific total loss index, which is highly concerned in the motor design, production and application, is obtained conveniently, quickly and accurately, providing very strong technical support for lean design.

[0070] In the technical solution of the embodiment of the present invention, by fixing the target magnetic bridge at the two tooth ends of the tooth yoke unit of the stator core, the target magnetic bridge and the tooth yoke unit of the stator core form a closed magnetic circuit, and the exciting winding and the measuring winding are passed through the yoke part of the tooth yoke unit of the stator core and installed on the tooth yoke unit of the stator core and / or the target magnetic bridge to obtain the stator core unit to be measured. Then, the iron loss measurement controller is used to obtain the iron loss measurement correlation data of the stator core unit to be measured, and further, according to the iron loss measurement correlation data and the equivalent method of the toroidal specimen, the iron loss of the stator core to be measured is determined. In the measurement system of the stator iron loss of this solution, the tooth yoke unit of the stator core samples from the stator core to be measured, retains the most critical tooth part performance, can fully represent the overall performance of the stator core to be measured, is closer to the actual service condition of the stator core to be measured, and the measurement range of this system is wide, can cover various working conditions of the stator core to be measured, has the advantages of simple, fast measurement process, good reproducibility and low test cost, solves the problem that the existing iron loss measurement method cannot accurately measure the iron loss of the stator core, and can accurately measure the iron loss of the stator core.

[0071] Embodiment III

[0072] Figure 2 is a flowchart of a method for measuring the iron loss of a stator core provided in Embodiment I of the present invention. This embodiment is applicable to the situation of accurately and conveniently measuring the iron loss of the stator core. This method can be executed by an iron loss measurement controller, and the iron loss measurement controller can be implemented in the form of hardware and / or software. As Figure 2 shown, this method includes:

[0073] S210. According to the iron loss measurement correlation data, determine the target geometric center line length of the tooth yoke unit of the stator core and the target magnetic bridge, and the lower limit value of the tooth part cross-sectional area of the tooth yoke unit of the stator core.

[0074] Among them, the target geometric center line can be the geometric center line length of the tooth yoke unit of the stator core and the target magnetic bridge. The lower limit value of the tooth part cross-sectional area can be the minimum cross-sectional area of the tooth part of the tooth yoke unit of the stator core.

[0075] In an embodiment of the present invention, the iron loss measurement associated data can be analyzed to obtain the target geometric center line length of the stator core yoke unit and the target magnetic bridge, which reflect the hardware characteristics of the stator core unit to be measured, and the lower limit value of the tooth cross-sectional area of the stator core yoke unit.

[0076] S220. Determine the loss data of the toroidal specimen according to the target geometric center line length, the lower limit value of the tooth cross-sectional area, and the toroidal specimen equivalent method.

[0077] Among them, the toroidal specimen loss data can be used to describe the iron loss magnitude of the toroidal specimen equivalent to the stator core unit to be measured.

[0078] In an embodiment of the present invention, the stator core unit to be measured can be equivalent to a toroidal specimen according to the toroidal specimen equivalent method, so that the target geometric center line length is used as the average magnetic circuit length of the toroidal specimen equivalent to the stator core unit to be measured, and the lower limit value of the tooth cross-sectional area is used as the cross-sectional area of the toroidal specimen equivalent to the stator core unit to be measured. Furthermore, according to the toroidal specimen equivalent method, the average magnetic circuit length of the equivalent toroidal specimen, and the cross-sectional area of the equivalent toroidal specimen, the toroidal specimen loss data is calculated.

[0079] S230. Determine the iron loss of the stator core to be measured according to the toroidal specimen loss data, the magnetic bridge material loss data, and the mass of the stator core yoke unit.

[0080] Among them, the magnetic bridge material loss data can be the energy loss data of the magnetic bridge in the electromagnetic field measured in advance by making the magnetic bridge into a standard sample. The mass of the stator core yoke unit can be used to characterize the mass of the stator core yoke unit.

[0081] In an embodiment of the present invention, the magnetic bridge material loss data measured in actual application as a standard sample can be obtained, and then according to the toroidal specimen loss data and the magnetic bridge material loss data, the total loss of the stator core yoke unit measured according to the toroidal specimen equivalent method is determined. Thus, according to the total loss of the stator core yoke unit and the mass of the stator core yoke unit, the unit mass energy loss of the stator core yoke unit in the electromagnetic field is calculated to obtain the iron loss of the stator core yoke unit, and the iron loss of the stator core yoke unit is used as the iron loss of the stator core to be measured.

[0082] In an optional embodiment of the present invention, determining the iron loss of the stator core to be measured according to the toroidal specimen loss data, the magnetic bridge material loss data, and the mass of the stator core yoke unit may include: retrieving the target magnetic bridge loss data according to the target magnetic bridge from the magnetic bridge material loss data; calculating the difference between the toroidal specimen loss data and the target magnetic bridge loss data to obtain the stator core yoke unit loss; and taking the ratio of the stator core yoke unit loss to the mass of the stator core yoke unit as the iron loss of the stator core to be measured.

[0083] Among them, the target magnetic bridge loss data may be the loss data corresponding to the target magnetic bridge in the magnetic bridge material loss data. The stator core tooth yoke unit loss may be the total loss of the stator core tooth yoke unit calculated according to the equivalent method of the toroidal specimen.

[0084] In the embodiment of the present invention, the magnetic bridge material loss data can be retrieved according to the material and size of the target magnetic bridge to obtain the target magnetic bridge loss data. Then, the difference between the toroidal specimen loss data and the target magnetic bridge loss data is used as the stator core tooth yoke unit loss, and then the ratio of the stator core tooth yoke unit loss to the mass of the stator core tooth yoke unit is calculated to obtain the iron loss of the stator core to be measured.

[0085] The technical solution of the embodiment of the present invention determines the target geometric center line length of the stator core tooth yoke unit and the target magnetic bridge, and the lower limit value of the tooth cross-sectional area of the stator core tooth yoke unit according to the iron loss measurement correlation data. Then, according to the target geometric center line length, the lower limit value of the tooth cross-sectional area, and the equivalent method of the toroidal specimen, the toroidal specimen loss data is determined. Furthermore, according to the toroidal specimen loss data, the magnetic bridge material loss data, and the mass of the stator core tooth yoke unit, the iron loss of the stator core to be measured is determined. The stator core tooth yoke unit in this solution is sampled from the stator core to be measured, retaining the most critical tooth performance, and can fully represent the overall performance of the stator core to be measured, being closer to the actual service conditions of the stator core to be measured. The measurement scenario can cover various working conditions of the stator core to be measured, and has the advantages of simple, fast, good reproducibility, and low test cost in the measurement process, solving the problem that the existing iron loss measurement method cannot accurately measure the iron loss, and being able to accurately measure the iron loss.

[0086] Embodiment 4

[0087] Figure 3 Shows a schematic structural diagram of an iron loss measurement controller that can be used to implement the embodiments of the present invention. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0088] As Figure 3As shown, the iron loss measurement controller 10 includes at least one processor 11 and a memory communicatively connected to the at least one processor 11, such as a read-only memory (ROM) 12, a random access memory (RAM) 13, etc. Among them, the memory stores a computer program executable by the at least one processor. The processor 11 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 12 or the computer program loaded from the storage unit 18 into the random access memory (RAM) 13. In the RAM 13, various programs and data required for the operation of the iron loss measurement controller 10 can also be stored. The processor 11, the ROM 12, and the RAM 13 are connected to each other via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0089] Multiple components in the iron loss measurement controller 10 are connected to the I / O interface 15, including: an input unit 16, such as a keyboard, a mouse, etc.; an output unit 17, such as various types of displays, speakers, etc.; a storage unit 18, such as a disk, an optical disc, etc.; and a communication unit 19, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 19 allows the iron loss measurement controller 10 to exchange information / data with other devices through a computer network such as the Internet and / or various telecommunication networks.

[0090] The processor 11 can be various general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of the processor 11 include but are not limited to a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 11 executes the various methods and processes described above, such as the method for measuring the iron loss of the stator core.

[0091] In some embodiments, the method for measuring the iron loss of the stator core can be implemented as a computer program, which is tangibly contained in a computer-readable storage medium, such as the storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed onto the iron loss measurement controller 10 via the ROM 12 and / or the communication unit 19. When the computer program is loaded into the RAM 13 and executed by the processor 11, one or more steps of the method for measuring the iron loss of the stator core described above can be executed. Alternatively, in other embodiments, the processor 11 can be configured to execute the method for measuring the iron loss of the stator core by any other appropriate means (e.g., by means of firmware).

[0092] The various embodiments of the systems and techniques described above in this specification can be implemented in digital electronic circuitry, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems-on-chip (SOCs), complex programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include: being implemented in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which may be a special-purpose or general-purpose programmable processor that receives data and instructions from, and transmits data and instructions to, a storage system, at least one input device, and at least one output device.

[0093] The computer program for implementing the methods of the present invention can be written in any combination of one or more programming languages. These computer programs can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the computer programs, when executed by the processor, cause the functions / operations specified in the flowchart and / or block diagram to be implemented. The computer program can be executed entirely on the machine, partly on the machine, as a stand-alone software package partly on the machine and partly on a remote machine or entirely on the remote machine or server.

[0094] In the context of the present invention, a computer-readable storage medium can be a tangible medium that can contain or store a computer program for use by or in connection with an instruction execution system, apparatus, or device. The computer-readable storage medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination of the foregoing. Alternatively, the computer-readable storage medium can be a machine-readable signal medium. More specific examples of the machine-readable storage medium would include an electrical connection based on one or more wires, a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0095] To provide interaction with a user, the systems and techniques described herein can be implemented on a core loss measurement controller that has: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the core loss measurement controller. Other kinds of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, speech input, or tactile input).

[0096] The systems and techniques described herein can be implemented in a computing system that includes backend components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes frontend components (e.g., a user computer having a graphical user interface or a web browser through which the user can interact with an implementation of the systems and techniques described herein), or a computing system that includes any combination of such backend components, middleware components, or frontend components. The components of the system can be interconnected to each other by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: local area network (LAN), wide area network (WAN), blockchain network, and the Internet.

[0097] A computing system can include a client and a server. The client and the server are generally far apart from each other and typically interact through a communication network. The relationship between the client and the server is generated by computer programs that run on the respective computers and have a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or a cloud host, which is a host product in the cloud computing service system and solves the defects of difficult management and weak business scalability existing in traditional physical hosts and VPS services.

[0098] It should be understood that various forms of the processes shown above can be used, with steps reordered, added, or deleted. For example, the steps recited in the present invention can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved, and no limitation is imposed herein.

[0099] The above specific embodiments do not constitute a limitation on the protection scope of the present invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A method for measuring the iron loss of a stator core, characterized in that, A measurement system including the stator core iron loss, the measurement system of the stator core iron loss includes a stator core unit to be measured and an iron loss measurement controller, wherein, The stator core unit to be measured includes a prefabricated winding, a target magnetic bridge and a stator core tooth yoke unit; the prefabricated winding includes an exciting winding and a measuring winding; the stator core tooth yoke unit includes a yoke part and two tooth parts of the stator core to be measured; the target magnetic bridge is fixed at the tail ends of the two tooth parts of the stator core tooth yoke unit, and the target magnetic bridge and the stator core tooth yoke unit form a closed magnetic circuit; the exciting winding and the measuring winding pass through the yoke part of the stator core tooth yoke unit and are installed on the stator core tooth yoke unit and / or the target magnetic bridge; The iron loss measurement controller is used to obtain the iron loss measurement related data of the stator core unit to be measured; according to the iron loss measurement related data, determine the target geometric center line length of the stator core tooth yoke unit and the target magnetic bridge, and the lower limit value of the tooth part cross-sectional area of the stator core tooth yoke unit; according to the target geometric center line length, the lower limit value of the tooth part cross-sectional area and the equivalent method of the ring sample, determine the ring sample loss data; according to the ring sample loss data, the magnetic bridge material loss data and the mass of the stator core tooth yoke unit, determine the iron loss of the stator core to be measured.

2. The method for measuring the iron loss of the stator core according to claim 1, wherein The exciting winding and the measuring winding pass through the yoke part of the stator core tooth yoke unit and are installed on the stator core tooth yoke unit, including: The exciting winding passes through the yoke part of the stator core tooth yoke unit and is installed on one side tooth part of the stator core tooth yoke unit; the measuring winding passes through the yoke part of the stator core tooth yoke unit and is installed on the other side tooth part of the stator core tooth yoke unit.

3. The method for measuring the iron loss of the stator core according to claim 1, wherein The number of turns of the exciting winding is determined based on the following formula: Among them, N1 is the number of turns of the exciting winding, H max is the peak value of the measured magnetic field strength, l m is the magnetic circuit length value of the stator core tooth yoke unit, I max is the peak value of the safe current of the enameled copper wire.

4. The method for measuring the iron loss of the stator core according to claim 1, wherein, The number of turns of the measuring winding is determined based on the following formula: Among them, N2 is the number of turns of the measuring winding, and U max is the peak value of the measuring power supply voltage, J max is the maximum magnetic polarization intensity value of the stator core tooth yoke unit, A m is the cross-sectional area of the stator core tooth yoke unit, and f is the measuring power supply frequency.

5. The measurement method of stator core iron loss according to claim 1, characterized in that The two tooth parts in the stator core unit to be measured are two adjacent tooth parts in the stator core to be measured, or two non-adjacent tooth parts in the stator core to be measured.

6. The method for measuring the iron loss of the stator core according to claim 1, characterized in that, The exciting winding and the measuring winding are plug-in windings.

7. The method for measuring the iron loss of the stator core according to claim 1, characterized in that, The determining the iron loss of the stator core to be measured according to the ring sample loss data, the magnetic bridge material loss data and the mass of the stator core tooth yoke unit includes: Retrieving the magnetic bridge material loss data according to the target magnetic bridge to obtain the target magnetic bridge loss data; Calculating the difference between the ring sample loss data and the target magnetic bridge loss data to obtain the stator core tooth yoke unit loss; Taking the ratio of the stator core tooth yoke unit loss to the mass of the stator core tooth yoke unit as the iron loss of the stator core to be measured.

8. An iron loss measurement controller, characterized in that, The iron loss measurement controller includes: At least one processor; and A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor so that the at least one processor can execute the method for measuring the iron loss of the stator core according to any one of claims 1-7.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing a processor to implement the method for measuring the iron loss of the stator core according to any one of claims 1-7 when executed.

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