Method for non-destructive classification of motorised used products

Abstract

To classify a used product by nondestructively discriminating the kind of a winding of a motor in the used product with the motor such as a compressor of a refrigerator.SOLUTION: The method includes an impedance characteristic acquisition step of acquiring an impedance characteristic including a peak value of an effective resistance at a resonance point obtained by applying a voltage to a motor provided in a used product and sweeping a frequency, and a winding form determination step of determining a winding form of the motor based on the peak value of the effective resistance obtained in the impedance characteristic acquisition step, and the used product is classified according to the winding form determined in the winding form determination step.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for sorting used products according to the type of windings in the internal motor when dismantling and re-commercializing used home appliances and the like.

[0002] Used home appliances such as washing machines, refrigerators, and air conditioners (hereinafter referred to as "used home appliances") are separated from parts including metal parts to reduce waste and recover useful resources. One of these useful resources is the compressor installed in household electric refrigerators and electric freezers (hereinafter referred to as "refrigerators, etc."), and recycling facilities that recycle used home appliances ship the compressors as valuable items at a set price. Conventionally, the motors built into these compressors used copper windings, but from around 2010, refrigerators and other devices equipped with compressor motors using aluminum windings began to be shipped. In fiscal 2020, aluminum windings were used in the majority of compressor motors installed in refrigerators and other devices shipped domestically by manufacturers, and the shift to aluminum windings in compressors is progressing rapidly.

[0003] However, it has been pointed out that if the ratio of compressors that use aluminum windings to the total number of compressors becomes high, there is a possibility that they will be shipped for a fee from recycling facilities, which could lead to a decrease in the recycling rate.One way to avoid this shipping for a fee is to collect all compressors by material at recycling facilities, but dismantling all compressors to check the winding material would involve significant costs, such as the cost of installing dismantling equipment, maintenance costs, and labor costs.

[0004] If it were possible to identify the type of motor windings in advance without dismantling the compressor when recycling used home appliances such as refrigerators, not only would it be possible to avoid the negative impact of charging for the motor, but it would also be possible to ship the appliances with a stable quality, which would contribute to improving the shipping price and prevent a decline in the recycling rate. Therefore, there is a need to establish a method for non-destructively identifying the type of compressor motor windings. Patent Document 1 describes a method for recycling wrought aluminum alloy material, in which eddy currents are formed in the wrought aluminum alloy material, the eddy currents are detected, the impedance is calculated from the detected eddy currents, and the material quality of the wrought aluminum alloy material is determined based on the impedance value. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2012-73185 Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, motor windings are not limited to those made entirely of copper wire or all aluminum wire, but there are also motors that use clad materials or that use both copper and aluminum.There are also two types of armature winding methods: concentrated winding, in which the windings are wound in adjacent slots to form a magnetic pole for each coil, and distributed winding, in which the windings are wound across slots to form a magnetic pole with multiple coils. In a motor with such a variety of motors, it is difficult to accurately distinguish the windings using the method described in Patent Document 1.

[0007] The present invention has been made in consideration of the above circumstances, and aims to classify used products by non-destructively determining the type of motor windings in used products such as compressors for refrigerators and other used home appliances with motors. [Means for solving the problem]

[0008] The method for classifying used products with motors of the present invention includes an impedance characteristics acquisition step of acquiring impedance characteristics including a peak value of effective resistance at a resonance point obtained by applying a voltage to a motor provided in a used product and sweeping the frequency, and a winding configuration determination step of determining the configuration of the motor's windings based on the peak value of effective resistance obtained in the impedance characteristics acquisition step, and classifying the used product according to the winding configuration determined in the winding configuration determination step.

[0009] As mentioned above, motor windings can be either concentrated or distributed, and can be made of either copper or aluminum. Some motors are made of a mixture of copper and aluminum. Therefore, simply measuring the motor's impedance does not accurately determine the material of the windings. In this case, the effective resistance at the resonance point of concentrated or distributed windings is distributed to one side or the other, with a specific value as the boundary. The present invention distinguishes the winding configuration from the peak value of the effective resistance, making it possible to distinguish the winding configuration of used products without destroying them. Furthermore, in determining the material, it is necessary to first distinguish between distributed winding and concentrated winding, which have different structures, and this method can distinguish these efficiently.

[0010] In the method for classifying used motor-equipped products of the present invention, the impedance characteristics include a corresponding frequency corresponding to the peak value of the effective resistance, and the method preferably further comprises a winding material determination step of determining the material of the windings based on the impedance characteristics having the winding configuration determined in the winding configuration determination step, the peak value of the effective resistance, and the corresponding frequency at that peak value.

[0011] In the method for classifying used motor-equipped products of the present invention, the winding material determining step may include sorting the used products in advance by the winding configuration determined in the winding configuration determining step, and determining the material of the winding for each winding configuration based on the impedance characteristics. Since the processing is performed separately for each winding configuration in advance, the discrimination process can be facilitated. [Effects of the Invention]

[0012] According to the present invention, by applying a voltage to a motor and sweeping the frequency, the peak value of the effective resistance at the resonance point is obtained and the configuration of the motor windings is determined. This allows used products to be identified and sorted non-destructively, and further allows distributed windings to be sorted separately from concentrated windings, thereby improving the efficiency of subsequent sorting work. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a plan view showing an example of a winding type discriminator used in a method for classifying used motorized products according to a first embodiment of the present invention; [Figure 2] 10 is a graph showing the relationship between frequency and effective resistance when a motor is measured using a winding type determination device. [Figure 3] FIG. 10 is a scatter plot of the impedance characteristics measured for each motor. [Figure 4] This is a scatter diagram in Figure 3, where (a) shows distributed winding and (b) shows concentrated winding. [Figure 5] 10 is a flowchart showing a winding form determination process executed in the method for classifying used motorized products according to the present embodiment. [Figure 6] 10 is a flowchart of a distributed winding determination process that is executed after a winding form determination step is executed. [Figure 7] 10 is a flowchart of a concentrated winding determination process that is executed after a winding form determination step is executed. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. A used product with a motor to be classified by the classification method of one embodiment is, for example, a compressor for a refrigerator or the like, and a motor 2 is provided inside the compressor 1. The compressor 1 is entirely housed in a cylindrical or other container, with refrigerant piping and the like extending from the container, and terminals for external connection of the motor 2 provided in a terminal box 3 on the outer surface of the container.

[0015] In one embodiment, a terminal box 3 on the outer surface of the container of the compressor 1 is provided with terminals connected to the motor 2. The windings of the motor 2 are either concentrated winding or distributed winding, and are made of copper, aluminum, a mixture of copper and aluminum with a high proportion of copper (copper-rich), or a mixture of copper and aluminum with a high proportion of aluminum (aluminum-rich).

[0016] These used motorized products are classified according to the type of windings of the motor 2. As shown in Figure 1, a winding type discrimination device 10 that discriminates the type of windings uses a single-phase 100V commercial power supply 11, and is connected to an impedance analyzer 14 via a noise filter transformer 12 that removes noise propagating through the power line and a stabilized power supply 13 that converts the AC voltage input from the commercial AC power supply 11 into a stable 100V AC voltage, with a computer 15 connected to the impedance analyzer 14. The impedance analyzer 14 is equipped with a four-terminal probe 16.

[0017] Next, a method for identifying the type of winding of the motor 2 in the compressor 1 using the winding type identification device 10 and for sorting used motorized products according to the type of winding will be described. This classification method includes an impedance characteristics acquisition step of applying a high-frequency voltage from a winding type identification device 10 to a motor 2 provided in a used product and sweeping the frequency to acquire impedance characteristics including a peak value (Rs(p)) of effective resistance at a resonance point obtained by treating the motor 2 as a series equivalent circuit and a corresponding frequency (f(p)) for the peak value (Rs(p)), and a winding type identification step of identifying the type of winding based on the peak value (Rs(p)) of effective resistance and the corresponding frequency (f(p)) obtained in the impedance characteristics acquisition step, and classifying the used product according to the type of winding of the motor 2 identified in the winding type identification step. Each step will be described in detail below.

[0018] 1. Impedance characteristics acquisition process The clip 16a of the probe 16 of the impedance analyzer 14 is attached to the terminal of the motor 2 of the used product, and a high-frequency voltage is applied and the frequency is swept to obtain the impedance characteristics. In this embodiment, a direct current is used, but a periodic voltage signal such as an alternating current voltage may also be used. When a high-frequency voltage is applied to the windings of the motor 2, the effective resistance of the series equivalent circuit, obtained for each frequency, suddenly rises at a specific frequency, resulting in a peak value (Rs(p)). The occurrence of this peak value (Rs(p)) is designated as the resonance point, and the frequency (f(p)) corresponding to this peak value (Rs(p)) (referred to as the corresponding frequency) is obtained. Effective resistance refers to the resistance value calculated taking into account power loss in an AC circuit. It is the resistance value (V / I) obtained by measuring the applied voltage (V) and the current (I) in phase with the applied voltage. The peak value (Rs(p)) of the effective resistance and the corresponding frequency (f(p)) are the impedance characteristics referred to in this embodiment. Effective resistance is a resistance that takes into account the effects of the winding's skin effect and eddy current loss, etc. By concentrating current on the surface of the winding conductor using high frequency, the effects of the winding's cross-sectional area can be reduced, resulting in a resistance value specific to the material.

[0019] Figure 2 is a graph of the measured effective resistance at each frequency, with frequency (f(kHz)) on the horizontal axis and effective resistance (Rs(kΩ)) on the vertical axis. As is clear from this graph, the peak effective resistance is Rs(p)kΩ when the frequency is f(p)kHz. The lower frequency side (left side) of this peak value (Rs(p)) represents the coil component of the winding, and the higher frequency side (right side) represents the capacitor component, and the point where these interfere with each other is the resonance point.

[0020] Therefore, in this embodiment, the series equivalent circuit mode is selected in the impedance analyzer 14, and the characteristics including the peak value (Rs(p)) of the effective resistance at the resonance point and the corresponding frequency (f(p)) of the peak value (Rs(p)) are acquired as the impedance characteristics.

[0021] Assuming the three external connection terminals are terminals A, B, and C, clips 16a are first attached to terminals A and B, respectively, and a voltage is applied using impedance analyzer 14. A frequency sweep is performed over a range of, for example, 5 kHz to 500 kHz to obtain the impedance characteristics of the peak value of effective resistance (Rs(p)) and the corresponding frequency (f(p)). This impedance characteristic is obtained for each combination of terminals. Therefore, three sets of data can be obtained for one motor 2: between terminals A and B, between terminals B and C, and between terminals A and C.

[0022] Three data sets for one motor are sent to computer 15, which determines the winding configuration and winding material of motor 2 based on each data set in accordance with the flowcharts of FIGS. FIG. 3 is a scatter plot of the impedance characteristics acquired by this impedance characteristic acquisition step, with the effective resistance peak value (Rs(p)) on the vertical axis and its corresponding frequency (f(p)) on the horizontal axis.

[0023] 2. Winding type identification process The winding type determination process consists of a winding form determination process that determines whether the winding form of the motor 2 is distributed winding or concentrated winding, and a winding material determination process that determines whether the material of the winding of the motor 2 is copper, copper-rich, aluminum, or aluminum-rich.

[0024] [Winding type identification process] Depending on whether the winding type is distributed or concentrated, there is a significant difference in the peak value of the effective resistance (Rs(p)) measured by the winding type discriminator 10, and the winding type can be discriminated based on whether the peak value (Rs(p)) is higher or lower than a predetermined value. Therefore, by separating the distributed winding data from the concentrated winding data, it becomes easier to closely examine the distributed winding data, which is concentrated in a narrow range.

[0025] Furthermore, when a motor has concentrated windings, the impedance characteristics are nearly the same for any combination of the three terminals due to the inclusion of an inverter, etc., whereas when a motor has distributed windings, there are cases where both the main and auxiliary windings use copper or aluminum wire, and cases where the auxiliary winding uses wire made of a different material from the main winding, resulting in different impedance characteristics depending on the terminal combination. Furthermore, if the main and auxiliary windings are different lengths, this also affects the impedance characteristics. Therefore, motors that use a mixture of copper and aluminum must also be classified. Therefore, by classifying the windings into distributed windings and concentrated windings in advance, it becomes possible to facilitate the subsequent process of determining the winding material.

[0026] Using the scatter diagram in Figure 3, the peak value of the effective resistance (Rs(p)) is divided into a group showing relatively high values ​​and a group showing low values, with the group showing relatively high values ​​being motors with concentrated winding, and the group showing low values ​​being motors with distributed winding. A predetermined value Y1 is set as a value that can divide these groups in half. In other words, if the peak value of the effective resistance (Rs(p)) is equal to or greater than the predetermined value Y1, it indicates that the winding configuration of motor 2 is concentrated winding, and if the peak value of the effective resistance (Rs(p)) is less than the predetermined value Y1, it indicates that the winding configuration of motor 2 is distributed winding.

[0027] This predetermined value Y1 is determined in advance from the relationship between the peak value of effective resistance (Rs(p)) and the winding configuration of the actual motor by conducting a preliminary survey of multiple used products arbitrarily selected from the used products to be classified, and is stored in the memory unit of the computer 15. Therefore, if the peak value of effective resistance (Rs(p)) is equal to or greater than the predetermined value Y1, it indicates that the winding configuration of the motor 2 is concentrated winding, and if it is less than the predetermined value Y1, it indicates that the winding configuration is distributed winding.

[0028] The predetermined values ​​for the peak value of effective resistance (Rs(p)) and the corresponding frequency (f(p)), which are compared with the actual measured values ​​in each of the subsequent discrimination processes, are also set based on the actual measured values ​​obtained by a previous survey of a number of arbitrarily selected used products using the winding type discrimination device 10 and on the survey of the actual windings in those used products, and are stored in the memory unit of the computer 15 of the winding type discrimination device 10.

[0029] Then, in the winding type discrimination process, the winding type of the used motor 2 is determined to be either distributed winding or concentrated winding based on the peak value of the effective resistance (Rs(p)) measured by the winding type discrimination device 10. That is, as shown in FIG. 5, in step S1, the computer 15 compares the peak value of the effective resistance (Rs(p)) with a predetermined value Y1 from the data input from the impedance analyzer 14, and determines whether the peak value of the effective resistance (Rs(p)) is equal to or greater than the predetermined value Y1. If the peak value of the effective resistance (Rs(p)) is equal to or greater than the predetermined value Y1 (YES), the computer 15 executes a determination process for concentrated winding, and if the peak value is determined to be less than the predetermined value Y1 (NO), the computer 15 executes a determination process for distributed winding.

[0030] The predetermined value Y1 varies depending on the manufacturer (manufacturer), model, and manufacturing date of the motor 2, and is determined in advance by a preliminary investigation and stored in the storage unit of the computer 15.

[0031] In this way, by first classifying used products according to the type of winding configuration of the motor 2 (concentrated winding, distributed winding), the subsequent classification process can be facilitated.

[0032] Figure 4(a) is a scatter plot of the scatter plot of Figure 3 in which only the data for distributed windings for which it was not determined in step S1 that the peak value of the effective resistance (Rs(p)) was equal to or greater than the predetermined value Y1 (NO), and Figure 4(b) is a scatter plot of the concentrated winding data for which it was determined that the peak value of the effective resistance (Rs(p)) was equal to or greater than the predetermined value Y1 (YES) after performing the representative value calculation process described below.

[0033] [Winding material identification process] As shown in FIG. 3, the relationship between the peak value of effective resistance (Rs(p)) and the corresponding frequency (f(p)) differs between the distributed winding motor and the concentrated winding motor identified in the winding type identification process described above. Therefore, the winding material identification process is executed separately as a distributed winding identification process for the distributed winding motor identified in the winding type identification process, and a concentrated winding identification process for the concentrated winding motor.

[0034] (Distributed winding discrimination processing) In the distributed winding discrimination process, as shown in Fig. 6, first, in step S2, it is determined whether the peak value of the effective resistance (Rs(p)) is equal to or greater than a predetermined value Y2. If the peak value of the effective resistance (Rs(p)) is equal to or greater than the predetermined value Y2 (YES), the winding is made of copper. If it is determined in step S2 that the peak value of the effective resistance (Rs(p)) is not equal to or greater than the predetermined value Y2 (NO), the process proceeds to step S3.

[0035] In the case of distributed winding, it is determined whether any one of the three data is equal to or greater than a predetermined value Y2. If any one of the data is equal to or greater than the predetermined value Y2 (if YES), the winding can be determined to be copper. If NO, proceed to step S3.

[0036] When one of these three data is equal to or greater than the predetermined value Y2 and a motor is identified, all three data for that motor are identified and deleted from the data to be judged thereafter. Therefore, when one of the motors 2 is classified, multiple pieces of data (up to three) are deleted.

[0037] Next, in step S3, it is determined whether the peak value of the effective resistance (Rs(p)) is equal to or less than Y3 and whether its corresponding frequency (f(p)) is equal to or greater than X1. If the determination result is YES, the material of the winding is a mixture of copper and aluminum, with a high copper ratio (copper-rich). If the determination result is NO, the process proceeds to step S4. As mentioned above, the main winding and the auxiliary winding may be made of different materials. If the main winding is copper and the auxiliary winding is aluminum, they are copper-rich, and the determination in step S3 is YES.

[0038] In step S4, it is determined whether the corresponding frequency (f(p)) of the peak value of the effective resistance (Rs(p)) is equal to or greater than a predetermined value X2. If it is determined that it is equal to or greater than X2, the copper-rich compressors 1 whose corresponding frequency (f(p)) is equal to or greater than the predetermined value X1 in step S3 have already been classified (data equal to or greater than the predetermined value X1 in FIG. 4 have been deleted), and therefore, of the remaining compressors 1, the material of the windings of the motor 2 of the compressors 1 whose corresponding frequency (f(p)) is equal to or greater than the predetermined value X2 is copper. If it is not determined that it is equal to or greater than X2 (NO), the process proceeds to step S5.

[0039] In step S5, it is determined whether the frequency (f(p)) corresponding to the peak value of the effective resistance (Rs(p)) is within a predetermined range of X3 to X4. If the frequency is within this range (YES), the material of the motor winding is aluminum. In FIG. 4, the range of X3 to X4 includes data for copper (black circles) and copper-rich (x marks). However, when step S5 is executed, the compressor 1 is classified in the steps prior to step S5, and these data are deleted from the discrimination target. Specifically, the data for compressor 1 determined in step 2 (copper), the data for compressor 1 determined in step S3 (copper-rich), and the data for compressor 1 determined in step S4 (copper) are deleted, so copper and copper-rich data do not exist within the predetermined range of X3 to X4. Therefore, if the data is within this predetermined range of X3 to X4, the winding can be determined to be aluminum. If the data is not within the range of X3 to X4 (NO), the winding is aluminum-rich.

[0040] (Discrimination process for concentrated winding) On the other hand, if step S1 returns YES, the winding material is identified using the concentrated winding identification process. In the case of a concentrated winding motor, due to factors such as the inclusion of an inverter, the peak value of the effective resistance (Rs(p)) measured at the three terminal combinations will be approximately the same for all three pieces of data, excluding any abnormal values. Therefore, the three pieces of data are averaged, and this average is used as a representative value (S11: representative value calculation process), and the winding material is identified based on this representative value. To exclude abnormal values, a primary average value of the three pieces of data is calculated, regardless of whether or not there are any abnormal values, and then an average value is calculated from the data that falls within a range of, for example, ±10% of the primary average value.

[0041] In this concentrated winding determination process, in step S12, it is determined whether the peak value of the effective resistance (Rs(p)) is equal to or greater than Y4 and whether its corresponding frequency (f(p)) is equal to or greater than a predetermined value X5. If the determination result is YES, the material of the winding is copper. If the determination result is NO, the process proceeds to step S13.

[0042] In step S13, it is determined whether the peak value of the effective resistance (Rs(p)) is equal to or greater than Y5 and whether its corresponding frequency (f(p)) is equal to or less than a predetermined value X6. If the determination result is YES, the material of the winding is copper. If the determination result is NO, the material of the winding is aluminum.

[0043] The above steps must be performed in the order listed, since the classification process for each winding form is performed after the winding form determination step, while excluding data that has already been classified.

[0044] As described above, in this method for classifying used motor-equipped products, first, the winding configuration is classified into concentrated winding and distributed winding based on the peak value of the effective resistance (Rs(p)) obtained in the impedance characteristic acquisition step, and then, for each winding configuration, the material of the winding is determined based on the impedance characteristics having the peak value of the effective resistance (Rs(p)) and the corresponding frequency (f(p)) at that peak value (Rs(p)), thereby making it easy to identify the winding material. Therefore, it is possible to identify the winding configuration of the internal motor without destroying the compressor. Moreover, since distributed windings can be classified separately from concentrated windings, subsequent classification work can be carried out quickly, improving work efficiency.

[0045] In the above-described determination process, the winding material could be determined by sequentially executing each flow for both distributed winding and concentrated winding, but if there is a motor in which the material cannot be determined (when the winding material cannot be determined), the motor is disassembled, etc., and the winding material is determined manually. When this determination becomes impossible, it means that the majority of motors have already been determined, and the number of motors is small, so little manual effort is required.

[0046] The aforementioned predetermined values ​​for the peak value of effective resistance (Rs(p)) and corresponding frequency (f(p)) may differ depending on the manufacturer (producer), model, and manufacturing date of the motor 2, so it is preferable to conduct a preliminary survey and classify used products that show similar trends to some extent. Furthermore, it is not necessary to automate the process until all motors can be classified. If it is efficient in terms of the overall classification process, once an appropriate number of motors have been classified, they may be disassembled and sorted manually.

[0047] Although the embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be embodied in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, as well as within the scope of the invention and its equivalents as defined in the claims. For example, the present invention has been applied to refrigerators and the like as used products, but it can also be applied to other used products such as refrigeration / freezing and air conditioning equipment and automobiles. [Example]

[0048] Five hundred refrigerator compressors were prepared as used products, and for 100 of these compressors, a DC voltage of 1 V was applied from impedance analyzer 14 of winding type identification device 10 shown in FIG. 1 , the series equivalent circuit mode was selected, and the frequency was swept from 5 kHz to 500 kHz to obtain the effective resistance for each frequency, from which the peak value of the effective resistance at the resonance point (Rs(p)kΩ) and the corresponding frequency (f(p)kHz) corresponding to that peak value (Rs(p)kΩ) were obtained.

[0049] The winding configuration and material of the motor in the measured compressor were investigated, and from the distribution of the peak value of effective resistance (Rs(p)) and the corresponding frequency (f(p)), a predetermined value Y1·· for the peak value of effective resistance (Rs(p)) and a predetermined value X1·· for the corresponding frequency (f(p)) were set. The predetermined values ​​were as follows: Y1=40kΩ Y2=19kΩ Y3=6kΩ X1=290kHz X2=148kHz X3=49kHz X4=60kHz Y4=84kΩ Y5=92kΩ X5=96kHz X6=78kHz

[0050] These predetermined values ​​were stored in the memory of the computer 15, and the impedance characteristics consisting of the peak value of the effective resistance (Rs(p)) and its corresponding frequency (f(p)) were obtained in the same manner for all remaining compressors. First, the winding configuration determination process shown in Figure 5 was carried out, and compressors whose peak effective resistance (Rs(p)) was equal to or greater than a predetermined value Y1 = 40 kΩ were classified as concentrated winding, and those whose peak resistance was less than 40 kΩ were classified as distributed winding. Of the total of 500 compressors, including the 100 that had been measured in advance, 250 were determined to have a concentrated winding configuration and 250 were determined to have a distributed winding configuration. Next, the compressors that were determined to have distributed winding were subjected to the distributed winding determination process shown in FIG. 6, and the compressors that were determined to have concentrated winding were subjected to the concentrated winding determination process shown in FIG. 7.

[0051] As a result, for distributed winding, it was possible to distinguish 150 windings with copper wire, 45 with copper-rich wire, 30 with aluminum, and 25 with aluminum-rich wire, while for concentrated winding, it was possible to distinguish 237 windings with copper wire and 11 with aluminum wire, with 2 being undistinguishable. Of these identified compressors, 100 that had been measured in advance and 2 that could not be identified were excluded, leaving a total of 398. Of these, 100 were randomly selected and their winding configuration and material were investigated, and the results were as expected. Therefore, it was found that this classification method can accurately classify the windings of the compressor motor. The above values ​​were obtained for compressor motors used in refrigerators, but the values ​​may be different for appliances other than home appliances such as automobiles, but similar determinations are possible. [Explanation of symbols]

[0052] 1 Compressor (used product with motor) 2 motors 3 Terminal box 10 Winding type discrimination device 11 Commercial power supply 12 Noise filter transformer 13 Stabilized power supply 14 Impedance analyzer 15. Computer 16 probes 16a clip

Claims

1. A non-destructive classification method for used products with motors, comprising: an impedance characteristics acquisition step of acquiring impedance characteristics including a peak value of effective resistance at a resonance point obtained by applying a voltage to a motor provided in a used product and sweeping the frequency; and a winding form discrimination step of discriminating the form of the motor windings based on the peak value of effective resistance obtained in the impedance characteristics acquisition step; and classifying used products according to the winding form discriminated in the winding form discrimination step.

2. 2. The non-destructive classification method for used motor-equipped products according to claim 1, further comprising a winding material determining step of determining a material of the windings based on the impedance characteristic having the winding configuration determined in the winding configuration determining step, the peak value of the effective resistance, and the frequency corresponding to the peak value, wherein the impedance characteristic includes a corresponding frequency corresponding to the peak value of the effective resistance.

3. 3. The non-destructive sorting method for used motor-equipped products according to claim 2, wherein the winding material determining step comprises: sorting the used products in advance according to the winding configuration determined in the winding configuration determining step; and determining the material of the winding for each winding configuration based on the impedance characteristics.

Images