Method and device for testing medium-frequency iron loss of silicon steel rotor sheet

Abstract

The present invention belongs to the field of measurement technology, specifically relates to the measurement of magnetic variables, and particularly relates to a method and device for testing the medium-frequency iron loss of silicon steel rotor sheets. The method for testing the medium-frequency iron loss of silicon steel rotor sheets includes: obtaining the test iron loss of the silicon steel rotor sheet through a control module; obtaining the damaged area of the shaft hole of the silicon steel rotor sheet through the control module; obtaining the area without holes of the silicon steel rotor sheet through the control module; and obtaining the actual iron loss of the silicon steel rotor sheet through the control module according to the test iron loss, the damaged area of the shaft hole and the area without holes of the silicon steel rotor sheet, thereby realizing the accurate detection of the actual iron loss of the silicon steel rotor sheet with punched holes and facilitating the accurate judgment of the performance of the silicon steel rotor sheet.

Description

Technical Field

[0001] The present invention belongs to the field of measurement technology, and particularly relates to the measurement of magnetic variables, and more particularly to a method and device for testing the medium-frequency iron loss of silicon steel rotor sheets. Background Art

[0002] After the silicon steel rotor sheet is processed, iron loss detection is required. In the related art, the square coil method is used for detection. Since the square coil method is based on the assumption of a closed magnetic circuit, the punching of the silicon steel rotor sheet forces the magnetic induction lines to detour, resulting in inaccurate iron loss detection.

[0003] Therefore, due to the technical problem of inaccurate iron loss detection of the silicon steel rotor sheet after punching by the square coil method, a method and device for testing the medium-frequency iron loss of the silicon steel rotor sheet need to be designed.

[0004] It should be noted that the above information disclosed in this background art section is only used to understand the background art of the concept of this application. Therefore, the above description is not considered as information of the prior art. Summary of the Invention

[0005] The embodiments of the present disclosure provide at least a method and device for testing the medium-frequency iron loss of silicon steel rotor sheets.

[0006] In a first aspect, the embodiments of the present disclosure provide a method for testing the medium-frequency iron loss of a silicon steel rotor sheet, including:

[0007] Obtaining the test iron loss of the silicon steel rotor sheet through a control module;

[0008] Obtaining the shaft hole damage area of the silicon steel rotor sheet through the control module;

[0009] Obtaining the non-hole area of the silicon steel rotor sheet through the control module;

[0010] Obtaining the actual iron loss of the silicon steel rotor sheet through the control module according to the test iron loss, shaft hole damage area and non-hole area of the silicon steel rotor sheet.

[0011] In an optional implementation manner, the method for obtaining the shaft hole damage area of the silicon steel rotor sheet through the control module includes:

[0012] The control module obtains the shaft hole radius of the silicon steel rotor sheet through a distance measuring sensor r , then the width of the shear plastic damage zone of the shaft hole of the silicon steel rotor sheet is:

[0013] W eq =ar ;

[0014] Wherein, W eq is the width of the shear plastic damage zone of the shaft hole of the silicon steel rotor sheet; ais the width coefficient;

[0015] The damaged area of the shaft hole of the silicon steel rotor sheet is:

[0016] A damage= π·（W eq +r） 2 ;

[0017] Among them, A damage is the damaged area of the shaft hole of the silicon steel rotor sheet.

[0018] In an alternative embodiment, the method for the control module to obtain the actual iron loss of the silicon steel rotor sheet based on the measured iron loss, the damaged area of the shaft hole, and the area without holes of the silicon steel rotor sheet includes:

[0019] The control module obtains the corrected area of the shaft hole:

[0020] ;

[0021] Among them, A e is the corrected area of the shaft hole; A is the area without holes of the silicon steel rotor sheet; μ r is the relative magnetic permeability of silicon steel.

[0022] In an alternative embodiment, the actual iron loss of the silicon steel rotor sheet is:

[0023] ;

[0024] Among them, P real is the actual iron loss of the silicon steel rotor sheet; P meas is the measured iron loss of the silicon steel rotor sheet; η is the iron loss increment coefficient caused by the punching process.

[0025] In an alternative embodiment, the method for the control module to obtain the measured iron loss of the silicon steel rotor sheet includes:

[0026] The control module obtains the measured iron loss of the silicon steel rotor sheet by using the square coil method through the acquisition circuit;

[0027] The acquisition circuit includes: a signal source, a power amplifier, and a test probe;

[0028] The test probe is arranged on the silicon steel rotor sheet;

[0029] The signal source is adapted to send a sine wave signal. The sine wave signal is injected into the test probe as a current signal after passing through a power amplifier. The test probe outputs an induced electromotive force to the control module, and the control module uses the square loop method to obtain the test iron loss of the silicon steel rotor sheet according to the induced electromotive force and the preset parameters of the silicon steel rotor sheet.

[0030] In a second aspect, an acquisition circuit used in a method for testing the medium-frequency iron loss of a silicon steel rotor sheet provided by an embodiment of the present disclosure includes:

[0031] A signal source, a power amplifier, and a test probe;

[0032] The test probe is disposed on the silicon steel rotor sheet;

[0033] The signal source is adapted to send a sine wave signal. The sine wave signal is injected into the test probe as a current signal after passing through a power amplifier. The test probe outputs an induced electromotive force to the control module, and the control module uses the square loop method to obtain the test iron loss of the silicon steel rotor sheet according to the induced electromotive force and the preset parameters of the silicon steel rotor sheet.

[0034] In a third aspect, an embodiment of the present disclosure further provides a medium-frequency iron loss test system for a silicon steel rotor sheet, including:

[0035] A test iron loss acquisition module configured to acquire the test iron loss of the silicon steel rotor sheet;

[0036] A shaft hole damage area acquisition module configured to acquire the shaft hole damage area of the silicon steel rotor sheet;

[0037] A non-hole area acquisition module configured to acquire the non-hole area of the silicon steel rotor sheet;

[0038] An actual iron loss acquisition module configured to acquire the actual iron loss of the silicon steel rotor sheet according to the test iron loss, the shaft hole damage area, and the non-hole area of the silicon steel rotor sheet.

[0039] In a fourth aspect, an embodiment of the present disclosure further provides a non-transitory readable storage medium, on which a computer program / instructions are stored, and when the computer program / instructions are executed by a processor, the steps of the method for testing the medium-frequency iron loss of the silicon steel rotor sheet are implemented.

[0040] In a fifth aspect, an embodiment of the present disclosure further provides a program product containing instructions, and when the instructions are run on a device, the device is caused to execute the steps of the method for testing the medium-frequency iron loss of the silicon steel rotor sheet.

[0041] In a sixth aspect, an embodiment of the present disclosure further provides a medium-frequency iron loss test device for a silicon steel rotor sheet, including:

[0042] A control module, and an acquisition circuit electrically connected to the control module;

[0043] The acquisition circuit is connected to the silicon steel rotor sheet, and the acquisition circuit is adapted to obtain the test iron loss of the silicon steel rotor sheet;

[0044] The control module is configured to adopt the above-mentioned medium-frequency iron loss test method for the silicon steel rotor sheet to obtain the actual iron loss of the silicon steel rotor sheet according to the test iron loss.

[0045] The beneficial effect of the present invention is that the medium-frequency iron loss test method for the silicon steel rotor sheet includes: obtaining the test iron loss of the silicon steel rotor sheet through the control module; obtaining the shaft hole damage area of the silicon steel rotor sheet through the control module; obtaining the non-hole area of the silicon steel rotor sheet through the control module; and obtaining the actual iron loss of the silicon steel rotor sheet through the control module according to the test iron loss, shaft hole damage area and non-hole area of the silicon steel rotor sheet, thereby realizing the accurate detection of the actual iron loss of the silicon steel rotor sheet with punching holes, and facilitating the accurate judgment of the performance of the silicon steel rotor sheet.

[0046] Other features and advantages of the present invention will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present invention. The objectives and other advantages of the present invention are realized and obtained by the structures specifically pointed out in the specification and the drawings.

[0047] To make the above objectives, features and advantages of the present invention more obvious and understandable, specific preferred embodiments are hereby given, and in conjunction with the accompanying drawings, the detailed description is as follows. Description of the Drawings

[0048] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0049] Figure 1 It is a flowchart of a medium-frequency iron loss test method for a silicon steel rotor sheet provided by an embodiment of the present disclosure;

[0050] Figure 2 It is a schematic diagram of an acquisition circuit provided by an embodiment of the present disclosure;

[0051] Figure 3 It is a principle block diagram of an acquisition circuit provided by an embodiment of the present disclosure;

[0052] Figure 4 It is a schematic diagram of the width of the shear plastic damage zone of the shaft hole of the silicon steel rotor sheet provided by an embodiment of the present disclosure. Detailed Embodiments

[0053] 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. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. 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 scope of protection of the present invention.

[0054] As used herein, phrases such as "in one embodiment", "according to one embodiment", "in some embodiments", etc. generally refer to the fact that the specific features, structures, or characteristics after such phrases can be included in at least one embodiment of the present disclosure. Therefore, a specific feature, structure, or characteristic can be included in more than one embodiment of the present disclosure, such that these phrases do not necessarily refer to the same embodiment. As used herein, terms such as "example", "exemplary", etc. are used "as an example, instance, or illustration. Any embodiment, aspect, or design described herein as "example" or "exemplary" is not necessarily construed as being preferred or superior to other embodiments, aspects, or designs. On the contrary, the use of terms such as "example", "exemplary", etc. is intended to present concepts in a specific manner.

[0055] After the silicon steel rotor sheet is processed, iron loss detection is required. In the related art, the square coil method is used for detection. However, the inventor found that since the square coil method is based on the assumption of a closed magnetic circuit, but the punching of the silicon steel rotor sheet forces the magnetic induction lines to detour, the actual damage of the punching process to the magnetic properties of the material cannot be obtained. Because there is a shear plastic deformation zone at the punching edge of the silicon steel rotor sheet, the magnetic permeability in this area decreases by 30% - 50%, the hysteresis loss increases by 15% - 25%, and the magnetic induction lines will avoid this damaged area when detouring around the hole. Therefore, the measured iron loss value cannot reflect the actual damage of the punching process to the magnetic properties of the material.

[0056] Regarding the defects existing in the above solutions, they are all the results obtained by the inventor through practice and careful research. Therefore, the discovery process of the above problems and the solutions proposed in the present disclosure by the present disclosure should be the contributions made by the inventor to the present disclosure during the process of the present disclosure.

[0057] It should be noted that similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0058] The following will describe in detail some embodiments of the present invention with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0059] As Figure 1As shown, at least one disclosed embodiment provides a method for testing the medium-frequency iron loss of a silicon steel rotor sheet, including: obtaining the test iron loss of the silicon steel rotor sheet through a control module; obtaining the shaft hole damage area of the silicon steel rotor sheet through the control module; obtaining the non-hole area of the silicon steel rotor sheet through the control module; and obtaining the actual iron loss of the silicon steel rotor sheet through the control module according to the test iron loss, shaft hole damage area, and non-hole area of the silicon steel rotor sheet, thereby achieving accurate detection of the actual iron loss of the silicon steel rotor sheet with punched holes and facilitating accurate judgment of the performance of the silicon steel rotor sheet.

[0060] In this embodiment, the silicon steel rotor sheet can be a single silicon steel sheet or the like.

[0061] In this embodiment, the control module can be a processor or the like.

[0062] As Figure 4 shown, in an alternative embodiment, the method for obtaining the shaft hole damage area of the silicon steel rotor sheet through the control module includes: obtaining the shaft hole diameter of the silicon steel rotor sheet to calculate the width of its shear plastic damage zone; the control module obtains the shaft hole radius of the silicon steel rotor sheet through a ranging sensor r , then the width of the shear plastic damage zone of the shaft hole of the silicon steel rotor sheet is:

[0063] W eq =ar ;

[0064] Wherein, W eq is the width of the shear plastic damage zone of the shaft hole of the silicon steel rotor sheet, with the unit of m ; a is the width coefficient, which can be 0.25;

[0065] The shaft hole damage area of the silicon steel rotor sheet is:

[0066] A damage= π·（W eq +r） 2 ;

[0067] Wherein, A damage is the shaft hole damage area of the silicon steel rotor sheet, with the unit of m 2 .

[0068] In this embodiment, after obtaining the shaft hole damage area of the silicon steel rotor sheet, the shaft hole damage area can be considered in the subsequent process of obtaining the actual iron loss, improving the accuracy of obtaining the actual iron loss and facilitating a more accurate reflection of the performance of the silicon steel rotor sheet.

[0069] In this embodiment, the cross-sectional shape of the shaft hole of the silicon steel rotor sheet can be circular.

[0070] In an alternative embodiment, the method for the control module to obtain the actual iron loss of the silicon steel rotor sheet according to the measured iron loss, the damaged area of the shaft hole, and the area without holes of the silicon steel rotor sheet includes: the control module obtains the corrected area of the shaft hole:

[0071] ;

[0072] Wherein, A e is the corrected area of the shaft hole, with the unit of m 2 ; A is the area without holes of the silicon steel rotor sheet, with the unit of m 2 ; μ r is the relative magnetic permeability of silicon steel.

[0073] Specifically, since the shaft hole of the silicon steel rotor sheet will be subjected to operations such as stamping and shearing during the manufacturing process, and the above will cause stress changes at the edge of the shaft hole, which will in turn cause a difference in the magnetic permeability between this part and the undamaged part. For this reason, a correction method is adopted. If the magnetic permeability of silicon steel is high, the influence of the shaft hole will be small. Therefore, correction is carried out according to the relative magnetic permeability of silicon steel. In this embodiment, the area without holes of the silicon steel rotor sheet can be obtained by subtracting the area of the shaft hole from the total area of the silicon steel rotor sheet. The total area and the area of the shaft hole of the silicon steel rotor sheet can be obtained by means such as image recognition. Using the image recognition method can better obtain the total area of the silicon steel rotor sheet.

[0074] In an alternative embodiment, the actual iron loss of the silicon steel rotor sheet is:

[0075] ;

[0076] Wherein, P real is the actual iron loss of the silicon steel rotor sheet, with the unit of W / kg ; P meas is the measured iron loss of the silicon steel rotor sheet, with the unit of W / kg ; η is the iron loss increment coefficient caused by the punching and shearing process, and the value range is 0.05 - 0.15, which needs to be calibrated through process parameters such as the blanking gap and the wear degree of the punch.

[0077] Specifically, in the formula as the shaft hole correction term, it reflects the correction of the square relationship of the magnetic induction intensity caused by the magnetic field distortion.η It is the incremental coefficient of iron loss caused by the punching process. That is, if the punching gap is small and the punch has no wear, the punching process has little impact on iron loss, and it is approximately corrected by the magnetic field distortion caused by the shaft hole.

[0078] As Figure 3 shown, in an optional implementation, the method for the control module to obtain the test iron loss of the silicon steel rotor sheet includes: the control module obtains the test iron loss of the silicon steel rotor sheet through the square coil method by the acquisition circuit; the acquisition circuit includes: a signal source, a power amplifier, and a test probe; the test probe is arranged on the silicon steel rotor sheet; the signal source is adapted to send a sine wave signal, and after the sine wave signal passes through the power amplifier, the current signal is injected into the test probe, and the test probe outputs an induced electromotive force to the control module, and the control module obtains the test iron loss of the silicon steel rotor sheet by using the square coil method according to the induced electromotive force and the preset parameters of the silicon steel rotor sheet.

[0079] In this embodiment, the preset parameters of the silicon steel rotor sheet may include the width, thickness, etc. of the silicon steel rotor sheet.

[0080] In this embodiment, the signal source may be electrically connected to the control module, and the control module controls it to send a sine wave signal.

[0081] In this embodiment, the specific circuit of the acquisition circuit may be as Figure 2 shown. The signal source first generates a sine wave signal of 50 - 400 Hz , injects the current signal into the test probe through the power amplifier, and takes out the induced electromotive force at the other pole of the test probe Eb . In this design, the waveform coefficient of 1.11 should be always maintained, and the distortion degree is less than 0.1%; the induced electromotive force Eb is input into the multiplier, and the multiplier multiplies Eb with Eb and Ei for multiplication calculation, that is W = Eb * Ei * cosθ , to obtain the total energy consumed by the silicon steel rotor sheet, and output the result to the control module for the control module to obtain the test iron loss; the test iron loss P meas = W / wgt ( w / kg ), where W is the total energy consumed by the silicon steel rotor sheet, with the unit of J ; w is the width of the silicon steel rotor sheet, with the unit of meter, and this parameter can be preset in the control module; gis the thickness of the silicon steel rotor sheet, in meters, and this parameter can be preset in the control module; t is the test time.

[0082] In this embodiment, Figure 2 the control modules in

[0083] In this embodiment, if the test iron loss P meas is 3.5, the damaged area A damage is 0.0019, the shaft hole correction area A e is 0.0105, the iron loss increment coefficient η is 0.1, the relative magnetic permeability of silicon steel μ r is 3500, the non - perforated area of the silicon steel rotor sheet A is 0.0106, then the true iron loss Pr eal is 3.15.

[0084] At least one other publicly disclosed embodiment also provides an acquisition circuit used in a method for testing the medium - frequency iron loss of a silicon steel rotor sheet, including: a signal source, a power amplifier, and a test probe; the test probe is arranged on the silicon steel rotor sheet; the signal source is adapted to send a sine - wave signal, and after the sine - wave signal passes through the power amplifier, a current signal is injected into the test probe, and the test probe outputs an induced electromotive force to the control module, and the control module uses the square - loop method to obtain the test iron loss of the silicon steel rotor sheet according to the induced electromotive force and the preset parameters of the silicon steel rotor sheet.

[0085] At least one other publicly disclosed embodiment also provides a medium - frequency iron loss test system for a silicon steel rotor sheet, including: a test iron loss acquisition module configured to acquire the test iron loss of the silicon steel rotor sheet; a shaft hole damage area acquisition module configured to acquire the shaft hole damage area of the silicon steel rotor sheet; a non - perforated area acquisition module configured to acquire the non - perforated area of the silicon steel rotor sheet; and an actual iron loss acquisition module configured to acquire the actual iron loss of the silicon steel rotor sheet according to the test iron loss, the shaft hole damage area, and the non - perforated area of the silicon steel rotor sheet.

[0086] In this embodiment, each module is a virtual module that executes each part of the function in a program or software, and its function can be inherited in the control module.

[0087] At least one other publicly disclosed embodiment also provides a non - transitory readable storage medium, on which computer programs / instructions are stored, and when the computer programs / instructions are executed by a processor, the steps of the above - mentioned method for testing the medium - frequency iron loss of a silicon steel rotor sheet are implemented.

[0088] At least one other disclosed embodiment also provides a program product including instructions that, when run on a device, cause the device to perform the steps of the above method for testing the medium-frequency iron loss of a silicon steel rotor sheet.

[0089] At least one other disclosed embodiment also provides a device for testing the medium-frequency iron loss of a silicon steel rotor sheet, including: a control module, and a collection circuit electrically connected to the control module; the collection circuit is connected to the silicon steel rotor sheet, and the collection circuit is adapted to obtain the test iron loss of the silicon steel rotor sheet; the control module is configured to use the above method for testing the medium-frequency iron loss of a silicon steel rotor sheet to obtain the actual iron loss of the silicon steel rotor sheet according to the test iron loss.

[0090] In summary, the method for testing the medium-frequency iron loss of a silicon steel rotor sheet includes: obtaining the test iron loss of the silicon steel rotor sheet through a control module; obtaining the damaged area of the shaft hole of the silicon steel rotor sheet through the control module; obtaining the non-hole area of the silicon steel rotor sheet through the control module; obtaining the actual iron loss of the silicon steel rotor sheet through the control module according to the test iron loss, the damaged area of the shaft hole, and the non-hole area of the silicon steel rotor sheet, thereby achieving accurate detection of the actual iron loss of the silicon steel rotor sheet with punched holes and facilitating accurate judgment of the performance of the silicon steel rotor sheet.

[0091] Enlightened by the above ideal embodiments according to the present invention, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for testing the medium-frequency iron loss of a silicon steel rotor sheet, characterized in that Including: Obtaining the test iron loss of the silicon steel rotor sheet through a control module; Obtaining the shaft hole damage area of the silicon steel rotor sheet through a control module; Obtaining the non-hole area of the silicon steel rotor sheet through a control module; Obtaining the actual iron loss of the silicon steel rotor sheet through a control module based on the test iron loss, shaft hole damage area, and non-hole area of the silicon steel rotor sheet; The method for obtaining the shaft hole damage area of the silicon steel rotor sheet through the control module includes: The control module obtains the shaft hole radius of the silicon steel rotor sheet through the ranging sensor r , then the width of the shear plastic damage zone of the shaft hole of the silicon steel rotor sheet is: W eq =ar ； Among them, W eq is the width of the shear plastic damage zone of the shaft hole of the silicon steel rotor sheet; a is the width coefficient; The shaft hole damage area of the silicon steel rotor sheet is: A damage= π·（W eq +r） 2 ； Among them, A damage is the damaged area of the shaft hole of the silicon steel rotor sheet; The method for obtaining the actual iron loss of the silicon steel rotor sheet through the control module based on the test iron loss, shaft hole damage area, and non-hole area of the silicon steel rotor sheet includes: Obtaining the shaft hole correction area through a control module: ； Among them, A e is the area for shaft hole correction; A is the area without holes of the silicon steel rotor sheet; μ r is the relative magnetic permeability of silicon steel; The actual iron loss of the silicon steel rotor sheet is: ； Among them, P real is the actual iron loss of the silicon steel rotor sheet; P meas is the measured iron loss of the silicon steel rotor sheet; η is the iron loss increment coefficient caused by the punching process.

2. The method for testing the medium-frequency iron loss of the silicon steel rotor sheet according to claim 1, wherein: The method for obtaining the test iron loss of the silicon steel rotor sheet through the control module includes: The control module obtains the test iron loss of the rotor sheet by using the square loop method through an acquisition circuit; The acquisition circuit includes: a signal source, a power amplifier, and a test probe; The test probe is arranged on the silicon steel rotor sheet; The signal source is adapted to send a sine wave signal. The sine wave signal is injected into the test probe as a current signal after passing through the power amplifier. The test probe outputs an induced electromotive force to the control module, and the control module obtains the test iron loss of the silicon steel rotor sheet by using the square loop method according to the induced electromotive force and the preset parameters of the silicon steel rotor sheet.

3. A medium-frequency iron loss testing system for silicon steel rotor sheets using the medium-frequency iron loss testing method for silicon steel rotor sheets as described in claim 1, characterized in that, Including: A test iron loss acquisition module configured to obtain the test iron loss of the silicon steel rotor sheet; A shaft hole damage area acquisition module configured to obtain the shaft hole damage area of the silicon steel rotor sheet; A non-hole area acquisition module configured to obtain the non-hole area of the silicon steel rotor sheet; An actual iron loss acquisition module configured to obtain the actual iron loss of the silicon steel rotor sheet based on the test iron loss, shaft hole damage area, and non-hole area of the silicon steel rotor sheet.

4. A non-transitory readable storage medium having computer programs / instructions stored thereon, characterized in that, When the computer program / instructions are executed by a processor, the steps of the method for testing the medium-frequency iron loss of the silicon steel rotor sheet according to claim 1 or claim 2 are implemented.

5. A program product comprising instructions, characterized in that, When the instructions are run by a device, the device is caused to execute the steps of the method for testing the medium-frequency iron loss of the silicon steel rotor sheet according to claim 1 or claim 2.

6. A medium-frequency iron loss testing device for a silicon steel rotor sheet, characterized in that Including: A control module and an acquisition circuit electrically connected to the control module; The acquisition circuit is connected to the silicon steel rotor sheet, and the acquisition circuit is adapted to obtain the test iron loss of the silicon steel rotor sheet; The control module is configured to adopt the method for testing the medium-frequency iron loss of the silicon steel rotor sheet according to claim 1 or claim 2 to obtain the actual iron loss of the silicon steel rotor sheet based on the test iron loss.

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