Washing machine roller motor stalling test method

Abstract

The invention relates to a washing machine drum motor locked-rotor test method, which comprises the following steps of S1, under the condition that a drum is not disassembled, enabling an expanding and supporting mechanism of a locked-rotor device to extend into the drum, and fixing the expanding and supporting mechanism on a washing machine shell by using a clamping mechanism; s2, adjusting the opening degree of the expanding and supporting mechanism, enabling the expanding and supporting mechanism to be tightly attached to the inner wall of the roller, limiting the rotation of the roller, and simulating a locked-rotor scene under an extreme load; s3, starting the washing machine, monitoring the operation condition of the motor in a locked-rotor state, recording key parameters such as current, voltage, rotating speed and temperature, and paying attention to abnormal sound or vibration; and S4, whether the motor has a fault or risk is evaluated according to observation and data. According to the method, detection can be carried out after the motor is installed, potential problems are found and solved in time, performance reduction or faults in use are avoided, and stable operation and good user experience of the washing machine are ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of stall testing of motors in an installed state, and in particular relates to a stall testing method for a drum motor of a washing machine. Background Art

[0002] The purpose of the stall test of the washing machine drum motor is to evaluate the performance and safety of the motor in a stalled state. Specifically, the stall test helps to achieve the following goals:

[0003] 1. Check the motor performance and health status: Through the stall test, the current, power and other parameters of the washing machine drum motor in the stalled state can be detected, and the motor performance can be evaluated. If the motor shows abnormalities when stalled, such as excessive current or power, it may mean that the motor is faulty or performance has deteriorated, and needs to be repaired or replaced in time.

[0004] 2. Ensure safe operation of the motor: The stall test can also check the motor's self-protection ability in extreme situations. In the stall state, the motor may cause safety risks due to excessive current and high temperature. Through testing, it can ensure that the motor can be shut down in time when similar situations occur, avoiding safety accidents such as fire, thereby protecting the safety of users.

[0005] 3. Optimizing motor design and manufacturing: For motor manufacturers, stall testing is an important means to optimize motor design and manufacturing. Through testing, possible problems in the design and manufacturing process of the motor can be found, such as unreasonable stator-rotor air gap, rotor defects, etc., and then the motor can be improved and optimized to improve the performance and reliability of the motor.

[0006] 4. Improve the overall performance of the washing machine: The performance of the drum motor of the washing machine directly affects the overall performance of the washing machine. The stall test can ensure the stability and reliability of the motor during the operation of the washing machine, thereby improving the washing effect and user experience of the washing machine.

[0007] Chinese invention patent ZL202410613360.2 discloses a motor stall test device and method, including an L-shaped test frame, a placement platform with adjustable height for placing the motor to be tested is arranged at the top of the horizontal plate part of the test frame, a pressing and limiting mechanism for resisting the position of the motor is arranged on one side of the placement platform located at the end of the motor, and the placement platform and the pressing and limiting mechanism are connected by a connecting piece; by setting a motor port disk and opening a placement groove that matches the motor to be tested, the motor can be limited in the motor port disk, and the position of the motor can be pressed and fixed in cooperation with the pressing and limiting mechanism, and when testing motors of different models, it is only necessary to disassemble the motor port disk and replace it with a motor port disk with a corresponding placement groove, and then replace the corresponding spline sleeve.

[0008] However, the above-mentioned motor stall test device and method are mainly suitable for independent testing before the motor is installed. For the drum motor of a washing machine, once the motor is installed, it is difficult to verify the impact of the drum motor in a stalled state on the entire washing machine due to the complexity of the internal structure of the washing machine and the particularity of the motor operating environment. This makes it difficult to detect some potential problems, thus affecting the overall performance of the washing machine and the user experience. Summary of the invention

[0009] The purpose of the present invention is to provide a method for testing the stall of a washing machine drum motor, which can detect the washing machine drum motor after it is installed, so as to promptly discover and solve potential motor problems during the operation of the whole machine, thereby avoiding performance degradation or failure of the washing machine during use, ensuring the stable operation of the washing machine and a good user experience.

[0010] To achieve the above object, the present invention provides a method for testing a stalled rotor of a washing machine drum motor, the key of which is to include the following steps:

[0011] S1: Without disassembling the drum of the washing machine, extend the expansion mechanism of the stalling device into the drum of the washing machine, and use the clamping mechanism of the stalling device to firmly fix it on the outer shell of the washing machine;

[0012] S2: The opening of the expansion mechanism is adjusted by adjusting the mechanism to ensure that it can fit closely to the inner wall of the drum, thereby limiting the rotation of the washing machine drum to simulate the stalling scenario of the drum motor under extreme load;

[0013] S3: Start the washing machine, monitor the operation of the drum motor in the blocked state, record key parameters including but not limited to the current, voltage, speed, temperature, etc. of the drum motor, and pay attention to whether there is any abnormal sound or vibration;

[0014] S4: Based on the observed phenomena and recorded data, evaluate whether the drum motor has any faults or potential risks.

[0015] Furthermore, the blocking device in step S1 includes a clamping mechanism for fixing on the outer shell of the washing machine and an expansion mechanism for expanding in the drum of the washing machine, and the opening of the expansion mechanism is controlled by an adjusting mechanism.

[0016] Furthermore, the clamping mechanism includes a three-point bracket, and each end of each arm of the three-point bracket is smoothly transitioned to be connected to a lateral extension section, and each of the lateral extension sections is connected to an abutment seat for abutting the washing machine shell through a hand-adjustable bolt.

[0017] Furthermore, the angle between two adjacent arms of the three-point bracket is 120°.

[0018] Furthermore, the abutment seat adopts a flexible suction cup structure with a hollow bottom.

[0019] Furthermore, the expansion mechanism comprises a transverse extension arm arranged on each of the support arms, and the end of the transverse extension arm is connected to an expansion seat and an adjustment mechanism through a multi-link structure.

[0020] Furthermore, the multi-link structure includes at least two first links hinged in parallel at the end of the transverse extension arm, and the end of each of the first links is hinged to a radially arranged second link, and the end of the second link is also equipped with a tensioning seat through a mounting plate; an inwardly extending extension rod is also connected to one of the first links, and the end of the extension rod is hinged to the output component of the adjustment mechanism.

[0021] Furthermore, the expansion seat is made of a flexible material, and its contact surface with the drum of the washing machine is adaptively set to be an arc surface, and the arc surface is roughened.

[0022] Furthermore, the adjustment mechanism includes a connecting seat as an output component, the connecting seat is connected to the three-point bracket through a telescopic guide column, and the lateral position of the telescopic guide column is adjusted by a hand wheel.

[0023] Furthermore, a screw is laterally arranged between the connecting seat and the three-point bracket, one end of the screw is rotatably connected to the center position of the connecting seat, and the other end of the screw passes through the three-point bracket through a pre-opened screw hole and is connected to the hand wheel.

[0024] Compared with the prior art, the present invention has the following remarkable effects:

[0025] (1) The washing machine drum motor stall test method of the present invention effectively solves the problem of post-installation testing and significantly improves the accuracy and practicality of the test. By using a clamping and expansion mechanism, the test device can be installed on the outer shell without removing the drum, and fits tightly against the inner wall to simulate the stall of the motor under extreme load. At the same time, key motor parameters such as current, voltage, speed, and temperature are monitored, and abnormal sounds or vibrations are checked to comprehensively evaluate the motor performance and safety. This method helps to detect motor problems in a timely manner and provide data support for motor design and manufacturing;

[0026] (2) The innovative three-point bracket and lateral extension design allow the clamping mechanism to perfectly fit the overall contour of commercially available washing machines. At the same time, the manual adjustment bolts and the flexible suction cup structure designed at the bottom ensure a close fit with the outer shell, allowing the clamping mechanism to be firmly installed on the washing machine shell;

[0027] (3) The expansion seat is extended from the entrance of the washing machine to the inside of the drum through an extension arm, and a multi-link structure is used to realize the transmission connection between the expansion seat and the adjustment mechanism to ensure the stable support of the washing machine drum in the stalled state. This design works in conjunction with the clamping mechanism and the adjustment mechanism to provide ideal experimental conditions for the stalled rotor test of the drum motor in the installed state;

[0028] (4) The adjustment mechanism can adjust the opening of the expansion mechanism to adapt to different stalling force requirements, ensuring that various stalling conditions are met, and it is compatible with a variety of washing machine models, thereby enhancing the flexibility and applicability of the device;

[0029] (5) The expansion seat with flexible material and curved surface design improves the fit with the washing machine drum and enhances the stability and safety during stalling. In addition, it avoids damage to the washing machine drum. At the same time, the friction force is further increased through roughening, effectively preventing the drum from sliding during stalling;

[0030] (6) The lateral position of the connecting seat can be precisely adjusted by the coordinated work of the hand wheel and the screw rod and by the guiding function of the telescopic guide column. Combined with the transmission efficiency of the multi-link structure, the operation process is simplified, thereby improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 is a schematic flow chart of a method for testing a stalled rotor of a washing machine drum motor in Embodiment 1;

[0033] Figure 2 is a three-dimensional diagram (I) of the device used in the method for testing the stall of the drum motor of a washing machine in Example 1;

[0034] Figure 3 is a stereoscopic diagram (II) of the device used in the method for testing the stall of the drum motor of a washing machine in Example 1;

[0035] Figure 4 is a three-dimensional diagram of the device used in the method for testing the stall of the drum motor of a washing machine in Example 1 (III);

[0036] Figure 5 is a three-dimensional diagram (four) of the device used in the method for testing the stall of the drum motor of a washing machine in Example 1;

[0037] Figure 6 yes Figure 5 A partial enlarged view of the middle A part;

[0038] Figure 7 1 is a schematic diagram of the state of the washing machine drum motor stall test method used in Example 1 (I);

[0039] Figure 8 2 is a schematic diagram of the state of the washing machine drum motor stall test method used in the first embodiment (II);

[0040] Fig. 9 3 is a schematic diagram of the state of the washing machine drum motor stall test method used in the first embodiment;

[0041] Numbers in the figure: 1-clamping mechanism, 2-expansion mechanism, 3-adjustment mechanism, 4-washing machine shell, 5-washing machine drum, 101-three-point bracket, 102-lateral extension section, 103-hand-adjustable bolt, 104-abutment seat, 201-lateral extension arm, 202-multi-link structure, 203-expansion seat, 2021-first connecting rod, 2022-second connecting rod, 2023-mounting plate, 2024-extension rod, 301-connecting seat, 302-telescopic guide column, 303-hand wheel, 304-screw, 305-screw hole. DETAILED DESCRIPTION

[0042] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0043] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0044] Figure 1 The first embodiment of the present invention is shown: a method for testing a stalled rotor of a washing machine drum motor, comprising the following steps:

[0045] S1: Without disassembling the washing machine drum 5, the expansion mechanism 2 of the stalling device is extended into the washing machine drum 5, and the stalling device is firmly fixed to the washing machine housing 4 using the clamping mechanism 1;

[0046] S2: adjusting the opening of the expansion mechanism 2 by adjusting the mechanism 3 to ensure that it can closely fit the inner wall of the drum 5, thereby limiting the rotation of the drum 5 of the washing machine to simulate the stalling scenario of the drum motor 5 under extreme load;

[0047] S3: Start the washing machine, monitor the operation of the drum motor in the blocked state, record key parameters including but not limited to the current, voltage, speed, temperature, etc. of the drum motor, and pay attention to whether there is any abnormal sound or vibration;

[0048] S4: Based on the observed phenomena and recorded data, evaluate whether the drum motor has any faults or potential risks.

[0049] As a preferred embodiment, in step S1, in addition to using the expansion mechanism 2 and the clamping mechanism 1 to fix the stalling device, a sensor is added to monitor the minute displacement of the drum 5 in real time to ensure that the expansion mechanism 2 and the inner wall of the drum 5 are in the best tight fit. In addition, in step S3, in addition to recording key parameters such as current, voltage, speed, and temperature, data analysis software is introduced to automatically analyze and record the performance change trend of the drum motor in the stalled state, providing more accurate data support for subsequent fault prediction and risk assessment. Finally, in step S4, the combination of sensor data and the results of the data analysis software can more comprehensively and accurately evaluate the health of the drum motor.

[0050] See also Figures 2 to 9 The stalling device in step S1 includes a clamping mechanism 1 for fixing on a washing machine housing 4 and an expansion mechanism 2 for expanding in a washing machine drum 5 , wherein the opening of the expansion mechanism 2 is controlled by an adjustment mechanism 3 .

[0051] like Figures 3 to 5As shown, in a specific implementation, the clamping mechanism 1 includes a three-point bracket 101, and each arm end of the three-point bracket 101 is smoothly connected to a transverse extension section 102, and each transverse extension section 102 is connected to an abutment seat 104 for abutting the washing machine housing 4 through a hand-adjusting bolt 103. The angle between two adjacent arms of the three-point bracket 101 is 120°. Preferably, the abutment seat 104 adopts a flexible suction cup structure with a hollow bottom. When necessary, the operator can easily adjust the position of the abutment seat 104 through the hand-adjusting bolt 103 to ensure that the clamping mechanism 1 can fit the washing machine housing 4 of different models and sizes. In addition, the angle between each arm of the three-point bracket 101 is 120°. Such a design makes the clamping mechanism 1 more uniform and stable when subjected to force, and effectively avoids damage or loosening caused by uneven force.

[0052] In this embodiment, the expansion mechanism 2 includes a transverse extension arm 201 disposed on each of the support arms, and the end of the transverse extension arm 201 is connected to an expansion seat 203 and an adjustment mechanism 3 through a multi-link structure 202. Figure 5 The multi-link structure 202 includes at least two first links 2021 hinged in parallel at the end of the transverse extension arm 201, and the end of each first link 2021 is hinged to a radially arranged second link 2022, and the end of the second link 2022 is also equipped with a tension seat 203 through a mounting plate 2023; an inwardly extending extension rod 2024 is also connected to one of the first links 2021, and the end of the extension rod 2024 is hinged to the output component of the adjustment mechanism 3. Specifically, the tension seat 203 is made of a flexible material, and its contact surface with the washing machine drum 5 is adaptively set to an arc surface, and the arc surface is roughened. When the adjustment mechanism 3 is working, the first link 2021 is pushed by the extension rod 2024, so that the first link 2021 and the second link 2022 rotate relative to each other, thereby driving the tension seat 203 to move radially, so as to achieve the blocking of the motor of the washing machine drum 5. The expansion seat 203 is closely fitted with the washing machine drum 5, which increases the stability and reliability during the stall. In addition, through the adjustment of the adjustment mechanism 3, the opening and the expansion force of the expansion seat 203 to the washing machine drum 5 can be easily adjusted to adapt to different models of washing machine drum 5 motors.

[0053] from Figures 3 to 5It can be seen that in a specific application scenario, the adjustment mechanism 3 includes a connection seat 301 as an output component, the connection seat 301 is connected to the three-point bracket 101 through a telescopic guide column 302, and the lateral position of the telescopic guide column 302 is adjusted by a hand wheel 303. Specifically, a screw rod 304 is transversely arranged between the connection seat 301 and the three-point bracket 101, one end of the screw rod 304 is rotatably connected to the center position of the connection seat 301, and the other end of the screw rod 304 passes through the three-point bracket 101 through a pre-opened screw hole 305 and is connected to the hand wheel 303. When the hand wheel 303 rotates, it can drive the screw rod 304 to rotate, and then drive the connection seat 301 to move laterally under the telescopic guide column 302, so as to achieve precise adjustment of the position of the connection seat 301. This design not only makes the adjustment process easier and faster, but also improves the accuracy and stability of the adjustment, ensuring that the expansion seat 203 can be accurately aligned and tightly fitted on the surface of the washing machine drum 5 to apply a locking expansion force to the washing machine drum 5. Preferably, a transmission shaft is also provided at the center of the hand wheel 301, and the transmission shaft can be connected to the rotating output shaft of the power tool through a thread or a spline. In some other embodiments, a driving component such as a cylinder or a hydraulic cylinder can also be horizontally provided between the connecting seat 301 and the three-point bracket 101 to achieve the adjustment of the lateral position of the connecting seat 301.

[0054] It is worth mentioning that washing machines usually include pulsator washing machines (usually with a top cover) and drum washing machines (usually with a side door). In a broader sense, they also include spin dryers, which are often called spin dryers. The drum of a washing machine is the drum for clothes. It is one of the most core parts of a washing machine and is responsible for loading and rotating clothes to complete the washing, rinsing, dehydration and other laundry processes. Our stalling device can be adapted to different types of washing machines to ensure that it can work stably and effectively on various washing machines.

[0055] In summary, the method for testing the stalled rotor of the drum motor of the washing machine of the present invention effectively solves the problem of post-installation testing and significantly improves the accuracy and practicality of the test. By using the clamping and expansion mechanism, the test device can be installed on the shell without disassembling the drum, and fits tightly with the inner wall to simulate the stalled rotor of the motor under extreme load. At the same time, the key parameters of the motor such as current, voltage, speed, temperature are monitored, and abnormal sounds or vibrations are checked to comprehensively evaluate the performance and safety of the motor. This method helps to timely discover motor problems and provide data support for motor design and manufacturing; the innovative three-point bracket 101 and lateral extension section 102 design are adopted, so that the clamping mechanism 1 can perfectly fit the overall contour of the commercially available washing machine. At the same time, the manual adjustment bolt and the flexible suction cup structure designed at the bottom ensure a close fit with the shell, so that the clamping mechanism 1 can be firmly installed on the washing machine shell 4; the expansion seat 203 is extended from the entrance of the washing machine to the inside of the drum by the extension arm, and the transmission connection between the expansion seat 203 and the adjustment mechanism 3 is realized by the multi-link structure 202, ensuring the stable support of the washing machine drum 5 in the stalled state. This design works in conjunction with the clamping mechanism 1 and the adjustment mechanism 3 to provide ideal experimental conditions for the drum motor to perform a stall test in the installed state; the adjustment mechanism 3 can adjust the opening of the expansion mechanism 2 to adapt to different stall force requirements to ensure that various stall situations are met, and it can be compatible with a variety of washing machine models, thereby enhancing the flexibility and scope of application of the device; the expansion seat 203 using flexible materials and curved surface design improves the fit with the washing machine drum 5 and enhances the stability and safety during stalling. In addition, it also avoids damage to the washing machine drum 5. At the same time, through rough treatment, the friction force is further increased, effectively preventing the drum from sliding during the stall process; through the coordinated work of the hand wheel 303 and the screw 304, and with the help of the guiding function of the telescopic guide column 302, the lateral position of the connecting seat 301 is accurately adjusted, combined with the transmission efficiency of the multi-link structure 202, the operation process is simplified, thereby improving work efficiency.

[0056] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A method for testing the stall of a washing machine drum motor, characterized in that The following steps are involved: S1: Without disassembling the drum of the washing machine, extend the expansion mechanism of the stalling device into the drum of the washing machine, and use the clamping mechanism of the stalling device to firmly fix it on the outer shell of the washing machine; S2: The opening of the expansion mechanism is adjusted by adjusting the mechanism to ensure that it can fit closely to the inner wall of the drum, thereby limiting the rotation of the washing machine drum to simulate the stalling scenario of the drum motor under extreme load; S3: Start the washing machine, monitor the operation of the drum motor in the blocked state, record key parameters including but not limited to the current, voltage, speed, temperature, etc. of the drum motor, and pay attention to whether there is any abnormal sound or vibration; S4: Based on the observed phenomena and recorded data, evaluate whether the drum motor has any faults or potential risks.

2. The method for testing the stall of a drum motor of a washing machine according to claim 1, characterized in that: The blocking device described in step S1 includes a clamping mechanism for fixing on the outer shell of the washing machine and an expansion mechanism for expanding in the drum of the washing machine, and the opening of the expansion mechanism is controlled by an adjusting mechanism.

3. The method for testing the stall of a drum motor of a washing machine according to claim 2, characterized in that: The clamping mechanism comprises a three-point bracket, each arm end of the three-point bracket is smoothly transitioned and connected to a transverse extension section, and each transverse extension section is connected to an abutment seat for abutting against the washing machine shell through a hand-adjustable bolt.

4. The method for testing the stall of a drum motor of a washing machine according to claim 3, characterized in that: The angle between two adjacent arms of the three-point bracket is 120°.

5. The method for testing the stall of a drum motor of a washing machine according to claim 4, characterized in that: The abutment seat adopts a flexible suction cup structure with a hollow bottom.

6. The method for testing the stall of a drum motor of a washing machine according to any one of claims 3 to 5, characterized in that: The expansion mechanism comprises a transverse extension arm arranged on each of the support arms, and the end of the transverse extension arm is connected with an expansion seat and an adjustment mechanism through a multi-link structure.

7. The method for testing the stall of a drum motor of a washing machine according to claim 6, characterized in that: The multi-link structure includes at least two first links hinged in parallel at the end of a transverse extension arm, and the end of each of the first links is hinged to a radially arranged second link, and the end of the second link is also equipped with a tension seat through a mounting plate; an inwardly extending extension rod is also connected to one of the first links, and the end of the extension rod is hinged to the output component of the adjustment mechanism.

8. The method for testing the stall of a drum motor of a washing machine according to claim 7, characterized in that: The expansion seat is made of flexible material, and its contact surface with the drum of the washing machine is adaptively set to be an arc surface, and the arc surface is roughened.

9. The method for testing the stall of the drum motor of a washing machine according to claim 7 or 8, characterized in that: The adjustment mechanism comprises a connecting seat as an output component, the connecting seat is connected to the three-point bracket through a telescopic guide column, and the lateral position of the telescopic guide column is adjusted by a hand wheel.

10. The method for testing the stall of the drum motor of a washing machine according to claim 9, characterized in that: A screw rod is transversely arranged between the connecting seat and the three-point bracket, one end of the screw rod is rotatably connected to the center position of the connecting seat, and the other end of the screw rod passes through the three-point bracket through a pre-opened screw hole and is connected to the hand wheel.

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