A DC motor magnetic stabilization tool and magnetic stabilization method thereof

Abstract

A DC motor magnetic stabilization tool and a magnetic stabilization method thereof. The magnetic stabilization tool is mainly composed of a vehicle-mounted magnetic stabilization fixture, a magnetic stabilization power supply and a fixed work surface that can be connected to electricity. The magnetic stabilization fixture is easy to operate. The screw rod is rotated by a handle, and the sleeve sleeve is sleeved on the motor bracket. The blocking piece penetrates into the slot of the motor shaft core, and the motor can be locked. The control switch is turned on to block the motor. It is designed by itself, simple to process, easy to operate, and does not require complex tool design. The existing blocking tool system is all in the laboratory. This simple design can be incorporated into the production line, and 100% of the motor is blocked to achieve the purpose of magnetic stabilization; the magnetic stabilization method calculates the magnetic stability of the motor magnet and the stability of the working point, and boldly adopts the motor blocking forced demagnetization method. The motor produced by the method has stable performance throughout the life of the motor, the spark does not change suddenly and is always kept at level 1, the output torque is within the error range of ±3%, the working point efficiency remains unchanged, the motor does not demagnetize after the end of its life, and the life 100% meets the design requirements.

Description

Technical Field

[0001] The invention relates to the field of magnetization and magnetic stabilization testing of a permanent magnet direct current motor, and in particular to a magnetic stabilization tooling and a magnetic stabilization method for a direct current motor. Background Art

[0002] Permanent magnet DC motors can be divided into permanent magnet brushless DC motors and permanent magnet brushed DC motors according to whether they have brushes or not. In order to ensure that the electrical performance of permanent magnet motors does not change and can operate reliably for a long time, the magnetic properties of permanent magnet materials must remain stable. The rate of change of magnetic properties of permanent magnet materials with environment, temperature and time is usually used to express their stability, mainly including thermal stability, magnetic stability, chemical stability and time stability. The thermal stability parameters of permanent magnet materials are the temperature coefficient of residual magnetic induction intensity of permanent magnets, the temperature coefficient of intrinsic coercive force of permanent magnets, the loss rate of magnetic properties, Curie temperature and maximum operating temperature. The methods adopted by motor industry enterprises include high and low temperature shock, the motor is started alternately in both positive and negative directions at 1.1 times the rated voltage for 5 times, and its no-load current should not exceed 1.05 times the current before the motor no-load test. For details, please refer to GB / T6656, JB / T 5276, etc. When the permanent magnet is magnetized, it should be fully magnetized in the process operation, that is, the magnetization magnetic field intensity H should be greater than the saturation magnetic field intensity Hs, in order to obtain the maximum possible magnetization and demagnetization curve. Such a demagnetization curve is the most stable and has the best magnetic properties. The factors that affect the magnetic stability of the motor are magnetic aftereffect and temperature effect. Generally, thermal aging treatment is used to eliminate irreversible losses, reduce magnetic aftereffects, and improve thermal stability. At the same time, permanent magnetic materials with large intrinsic coercive force are selected to appropriately increase the working point. The reversible temperature demagnetization effect is considered when designing the motor, and the demagnetization curve of the rated temperature rise of the motor is used as the design basis.

[0003] It is easy for companies in the motor industry to perform calibration calculations at the maximum demagnetization working point to ensure irreversible demagnetization at the lowest ambient temperature. The demagnetization curve at the rated temperature rise of the motor is used as the design requirement to control the temperature rise of the magnet so that it does not exceed the design requirements. Although companies in the motor industry have taken these issues into consideration, the demagnetization of the permanent magnet reaches more than 35% after the motor life, and during the life, the current increases, the speed decreases, the output torque is low, the temperature rises, the efficiency is low or accompanied by large sparks, and the carbon brushes are severely worn. At the end of the life, it is less than 2 / 3 of the design life. Design engineers often choose materials with greater coercive force and greater magnetic energy product, but the cost increases, the problem is still not effectively solved, the performance still deteriorates, and the sparks still mutate. The reason is that it is difficult to deal with the technical problems of the permanent magnet working point during demagnetization to maximize the benefit balance between cost, quality and performance.

[0004] Permanent magnet motors have stability problems, and their stability is determined by the magnetic stability of the motor magnets and the stability of the working point. Changes in the magnetic properties and working point of the motor magnets will inevitably cause changes in the motor working flux and the working characteristics of the motor. The stability of the magnet working point is mainly affected by the armature reaction and the change in the magnetic resistance of the external magnetic circuit. For permanent magnet motors with nonlinear demagnetization curve magnets in the working section, it is necessary to reasonably select the working point stabilization method. In terms of motor design and process, the maximum demagnetization working point must be verified so that it is above the inflection point of the permanent magnet demagnetization curve. When designing and processing permanent magnet motors, it is necessary to calculate the magnetic field distribution in the motor under the most severe demagnetization condition, so that the lowest local working point in the permanent magnet is higher than the inflection point of the demagnetization curve, in order to ensure that no local demagnetization occurs in the motor during operation. The optimal working point of the maximum effective magnetic energy is not necessarily the optimal motor design, that is, the determination of the magnetic stability of the motor magnets and the stability of the working point must serve a reasonable motor design, which includes the cost-quality-performance benefit balance and customer and market requirements. As permanent magnet motors are used for longer periods of time, aging of permanent magnets is inevitable. Ensuring that the permanent magnets do not lose magnetism during the entire design life as required by customers is a basic design requirement. Summary of the invention

[0005] The present invention aims to overcome the defects of the prior art and provides a DC motor magnetic stabilization tool and a magnetic stabilization method thereof.

[0006] A DC motor magnetic stabilization tooling, including a base plate, a connecting plate, a mounting plate, a handle, a turntable, a lead screw, a screw, a slider assembly, a slide seat, a pressure plate 1, a guide sleeve, a blocking piece, a limit column 1, a limit column 2, a pressure plate 2, a large base plate, a bearing assembly, a demoulding screw, a motor fixing seat, a guide plate and a mounting base plate, wherein the motor fixing seat is mounted on the mounting base plate, the base plate and the guide plate are fixedly mounted on the large base plate, and the base plate is located on one side of the guide plate, the connecting plate is assembled on the base plate, the mounting plate is mounted on the outer side of the connecting plate, the slide seat is mounted on the connecting plate, the slide block assembly is mounted on the slide seat by screws, one end of the lead screw is connected to the slide The components are installed in coordination, and the other end of the lead screw passes through the bearing assembly on the mounting plate and is connected to the turntable. The pressure plate 1 is installed on the slide seat to form a slider box; the blocking piece is installed in the guide sleeve, and the guide sleeve is installed on the side of the slider assembly close to the motor fixing seat. The limit column 1 and the limit seat 2 are installed on the large base plate on the other side of the mounting base plate, and the pressure plate 2 is installed on the limit column 1 and the limit seat 2. The large base plate is fixed to the workbench by screws; the mounting base plate is also provided with a wiring clamp and a vehicle-mounted elastic contact 1 and a vehicle-mounted elastic contact 2; the wiring clamp is provided with a wiring clamp contact 1, a wiring clamp contact 2 and a wiring clamp button, and vehicle-mounted rolling wheels are provided on both sides of the mounting base plate. The mounting base plate is placed on the guide plate and is positioned by clamping the vehicle-mounted rolling wheels on both sides on the two sides of the guide plate.

[0007] Furthermore, the vehicle-mounted elastic contact 1 is connected to the wiring clamp contact 1, and the vehicle-mounted elastic contact 2 is connected to the wiring clamp contact 2.

[0008] Furthermore, the power output line of the magnetic stabilization control box is respectively connected to the bottom plate fixed contact 1 and the bottom plate fixed contact 2, and the vehicle-mounted elastic contact 1 and the vehicle-mounted elastic contact 2 are respectively in contact with the bottom plate fixed contact 1 and the bottom plate fixed contact 2.

[0009] Furthermore, the motor leads are connected to the first and second wiring clamp contacts according to the positive and negative poles.

[0010] Furthermore, the control switch is connected to the magnetic stabilization control box, and the control switch directly switches the magnetic stabilization voltage of the fixed contact 1 and the fixed contact 2.

[0011] Furthermore, the handle is mounted on the turntable via a demoulding screw.

[0012] A method for stabilizing the magnetic field of a DC motor, using the above-mentioned magnetic stabilization tooling to stabilize the magnetic field, specifically comprises the following steps:

[0013] (1) The stator iron shell assembly with the magnet bonded is hereinafter referred to as the stator assembly, and is assembled into a permanent magnet DC motor through the front and rear brackets, the rotor assembly, and the positioning screws, and the motor is magnetized (magnetization is performed according to the set technical specifications, and the magnetization clamp is designed with an error-proof device);

[0014] (2) Check the magnetic field strength of the stator assembly using a Tesla meter (4 pieces / 2 hours) and then perform polarity detection;

[0015] (3) Install carbon brush assemblies, springs, capacitor and inductor assemblies, cut and tie cables, and weld capacitor and inductor assemblies;

[0016] (4) The motor is put into the vehicle and the motor leads are connected to the vehicle according to the positive and negative pole markings.

[0017] (5) The vehicle is mounted into the sports car fixture, and the motor runs at no load for 1 minute under rated voltage conditions;

[0018] (6) Confirm the parameters and set the magnetic stabilization voltage and time;

[0019] (7) Adjust the axial limit columns at the front and rear ends, place the motor on the vehicle in the middle of the magnetic stabilizing fixture, and make the vehicle-mounted elastic contacts A3 / B3 and A4 / B3 fit in contact with the bottom plate fixed contacts A1 and A2 of the work surface;

[0020] (8) Use the handle 4 to adjust the blocking piece 12 counterclockwise and forward so that it penetrates into the slot at the end of the motor shaft core, rotate the motor shaft core, and determine whether the rotor is fixed and whether the rear end of the motor bracket is inserted into the guide sleeve 11;

[0021] (9) After confirming that the vehicle-mounted motor wiring is correct and that the motor rotor cannot rotate forward or reverse, start the control switch, implement magnetic stabilization treatment, and perform stalling. Without starting the control switch, no voltage or current will pass. During the stalling process, it is necessary to visually check whether the carbon brushes emit instantaneous smoke and sparks.

[0022] (10) After the stall is completed, the handle 4 is turned clockwise and the stall piece 12 leaves the motor, and a magnetic stabilization mark is added;

[0023] (11) The motor is removed from the vehicle and subjected to vibration test, no-load test, load test, noise test, motor installation dimension measurement and appearance inspection in sequence, and finally the motor is packaged;

[0024] (12) Life test (randomly test 5 pieces from each batch to perform performance, dynamometer and life test, record life process data, and test magnetic field strength data after life).

[0025] In summary, the present invention has the following beneficial effects: after the motor is stabilized by magnetism, the performance is stable throughout the life, the spark does not change suddenly and always remains at level 1, the output torque is within the error range of ±3%, the working point efficiency remains unchanged, the motor does not demagnetize after the end of its life, and the life 100% meets the design requirements. 1.06 times the rated working voltage is suddenly reversed and frequently started, the no-load performance of the motor is the same before and after magnetism stabilization, and the working point of the permanent magnet no longer changes; the motor is working under rated load, and the motor is suddenly short-circuited, even at a demagnetization current of 10 times the rated current, the permanent magnet is no longer demagnetized. On the one hand, it is controllable to monitor the temperature change in the permanent magnet of the motor at about ±3°C; on the other hand, due to the residual magnetism of the magnet each time it is fed, the coercive force and the intrinsic coercive force have a certain fluctuation range, resulting in motor performance differences, and the motor performance is met by adjusting the magnetism stabilization parameters. This solution is limited to two-pole ferrite permanent magnet DC brushed motors. It is not recommended to use this solution for rare earth materials, especially bonded NdFeB materials. When using this solution, technical and engineering personnel are required to fully evaluate the stability of the permanent magnet and calculate the operating point and stability of the permanent magnet DC motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is the waveform diagram of the positive and negative magnetic field strength;

[0027] Figure 2 It is a three-dimensional waveform diagram of the positive and negative magnetic field strength;

[0028] Figure 3 It is a schematic diagram of the overall structure of the magnetic stabilizing tooling;

[0029] Figure 4 This is the wiring diagram of the magnetic stabilization vehicle Figure 1 ;

[0030] Figure 5This is the wiring diagram of the magnetic stabilization vehicle Figure 2 ;

[0031] Figure 6 This is the wiring diagram of the magnetic stabilization vehicle Figure 3 ;

[0032] Figure 7 The vehicle structure is shown Figure 1 ;

[0033] Figure 8 The vehicle structure is shown Figure 2 ;

[0034] Fig. 9 It is a structural schematic diagram of the magnetic stabilizing clamp;

[0035] Fig.10 This is the wiring diagram of the magnetic stabilizing power supply.

[0036] In the figure: 1. base plate; 2. connecting plate; 3. mounting plate; 4. handle; 5. turntable; 6. lead screw; 7. screw; 8. slider assembly; 9. slide seat; 10. pressure plate 1; 11. guide sleeve; 12. blocking piece; 13. limit column 1; 14. limit column 2; 15. pressure plate 2; 16. large base plate; P1. bearing assembly; P2. demoulding screw; A1. base plate fixed contact 1; A2. base plate fixed contact 2; B1. vehicle-mounted rolling wheel; B2. motor fixing seat; (A3 / B3), vehicle-mounted elastic contact 1; (A4 / B4), vehicle-mounted elastic contact 2; B5, wiring clamp contact 1; B6, wiring clamp contact 2; B7. mounting base plate; B8. wiring clamp button; B9. guide plate. DETAILED DESCRIPTION

[0037] Embodiment 1: A DC motor magnetic stabilization tool, such as Figure 3-Figure 10As shown, it includes a base plate 1, a connecting plate 2, a mounting plate 3, a handle 4, a turntable 5, a lead screw 6, a screw 7, a slider assembly 8, a slide seat 9, a pressure plate 10, a guide sleeve 11, a blocking piece 12, a limit column 13, a limit column 2 14, a pressure plate 2 15, a large base plate 16, a bearing assembly P1, a demoulding screw P2, a motor fixing seat B2, a guide plate B9 and a mounting base plate B7, wherein the motor fixing seat B2 is mounted on the mounting base plate B7, the base plate 1 and the guide plate B9 are fixedly mounted on the large base plate 16, and the base plate 1 is located on one side of the guide plate B9, the connecting plate 2 is assembled on the base plate 1, the mounting plate 3 is mounted on the outer side of the connecting plate 2, the slide seat 9 is mounted on the connecting plate 2, and the slider assembly 8 is fixed by screws 7 Installed on the slide 9, one end of the lead screw 6 is installed in cooperation with the slider assembly 8, and the other end of the lead screw 6 passes through the bearing assembly P1 on the mounting plate 3 and is connected to the turntable 5. The pressure plate 10 is installed on the slide 9 to form a slider box; the blocking piece 12 is installed in the guide sleeve 11, and the guide sleeve 11 is installed on the side of the slider assembly 8 close to the motor fixing seat B2. The limit column 13 and the limit seat 2 14 are installed on the mounting base B7 On the large base plate 16 on the other side, the pressure plate 2 15 is installed on the limit column 13 and the limit seat 2 14, and the large base plate 16 is fixed to the workbench by screws; the mounting base plate B7 is also provided with a wiring clamp and a vehicle-mounted elastic contact 1 A3 / B3 and a vehicle-mounted elastic contact 2 A4 / B4; the wiring clamp is provided with a wiring clamp contact 1 B5, a wiring clamp contact 2 B6 and a wiring clamp button B8, and vehicle-mounted rolling wheels B1 are provided on both sides of the mounting base plate B7. The mounting base plate B7 is placed on the guide plate B9 and is positioned by clamping the vehicle-mounted rolling wheels B1 on both sides on the guide plate B9.

[0038] Furthermore, the vehicle-mounted elastic contact A3 / B3 is connected to the wiring clamp contact B5, and the vehicle-mounted elastic contact A4 / B4 is connected to the wiring clamp contact B6.

[0039] Furthermore, the power output line of the magnetic stabilization control box is respectively connected to the bottom plate fixed contact A1 and the bottom plate fixed contact A2, and the vehicle-mounted elastic contact A3 and the vehicle-mounted elastic contact A4 are respectively in contact with the bottom plate fixed contact A1 and the bottom plate fixed contact A2.

[0040] Furthermore, the motor leads are connected to the wiring clamp contact 1 B5 and the wiring clamp contact 2 B6 according to the positive and negative poles.

[0041] Furthermore, the control switch is connected to the magnetic stabilization control box, and the control switch directly switches on and off the magnetic stabilization voltage of the fixed contact A1 and the fixed contact A2.

[0042] Furthermore, the handle 4 is mounted on the turntable 5 via a demoulding screw P2.

[0043] When working, by rotating the handle 4 clockwise, the turntable 5 pushes the screw rod 6 and the slider assembly 8 through the slider box composed of the slide seat 9 and the pressure plate 10 to push the guide sleeve 11 and the stalling piece to move forward; conversely, the handle 4 rotates counterclockwise, the turntable 5 pushes the screw rod 6 and the slider assembly Figure 8 The slider box composed of the seat 9 and the pressure plate 10 pushes the guide sleeve 11 and the blocking piece 12 to move backward in the opposite direction.

[0044] A method for stabilizing the magnetic field of a DC motor, using the above-mentioned magnetic stabilization tooling to stabilize the magnetic field, combined with the attached Figure 3 -Attached Fig.10 , specifically including the following steps:

[0045] (1) The stator iron shell assembly with the magnet bonded is hereinafter referred to as the stator assembly, and is assembled into a permanent magnet DC motor through the front and rear brackets, the rotor assembly, and the positioning screws, and the motor is magnetized (magnetization is performed according to the set technical specifications, and the magnetization clamp is designed with an error-proof device);

[0046] (2) Check the magnetic field strength of the stator assembly using a Tesla meter (4 pieces / 2 hours) and then perform polarity detection;

[0047] (3) Install carbon brush assemblies, springs, capacitor and inductor assemblies, cut and tie cables, and weld capacitor and inductor assemblies;

[0048] (4) The motor is put into the vehicle and the motor leads are connected to the vehicle according to the positive and negative pole markings.

[0049] (5) The vehicle is mounted into the sports car fixture, and the motor runs at no load for 1 minute under rated voltage conditions;

[0050] (6) Confirm the parameters and set the magnetic stabilization voltage and time;

[0051] (7) Adjust the axial limit columns at the front and rear ends, place the motor on the vehicle in the middle of the magnetic stabilizing fixture, and make the vehicle-mounted elastic contacts A3 / B3 and A4 / B3 fit in contact with the bottom plate fixed contacts A1 and A2 of the work surface;

[0052] (8) Use the handle 4 to adjust the blocking piece 12 counterclockwise and forward so that it penetrates into the slot at the end of the motor shaft core, rotate the motor shaft core, and determine whether the rotor is fixed and whether the rear end of the motor bracket is inserted into the guide sleeve 11;

[0053] (9) After confirming that the vehicle-mounted motor wiring is correct and that the motor rotor cannot rotate forward or reverse, start the control switch, implement magnetic stabilization treatment, and perform stalling. Without starting the control switch, no voltage or current will pass. During the stalling process, it is necessary to visually check whether the carbon brushes emit instantaneous smoke and sparks.

[0054] (10) After the stall is completed, the handle 4 is turned clockwise and the stall piece 12 leaves the motor, and a magnetic stabilization mark is added;

[0055] (11) The motor is removed from the vehicle and subjected to vibration test, no-load test, load test, noise test, motor installation dimension measurement and appearance inspection in sequence, and finally the motor is packaged;

[0056] (12) Life test (randomly test 5 pieces from each batch to perform performance, dynamometer and life test, record life process data, and test magnetic field strength data after life).

[0057] Before the magnetic stabilization experiment, prepare a digital magnetic stabilization power supply with adjustable voltage and frequency. The capacity should be at least 3 times the capacity of the motor to be stabilized. For example, if the maximum magnetic stabilization power of the motor to be stabilized is 5KW, the capacity of the magnetic stabilization power supply should be at least 15KVA. Set the motor magnetic stabilization voltage to 1.06 to 1.20 times the rated voltage of the motor to be stabilized, and force demagnetize the motor for 1 to 3 seconds with full-wave rectification and stalled rotor. The higher the magnetic stabilization voltage, the smaller the magnetic stabilization time can be, and the lower the magnetic stabilization voltage, the larger the magnetic stabilization time can be.

[0058] It should be noted that the quality personnel need to refer to the technical specifications and arrange 10 pieces of whole machine magnetization first. After measuring the magnetic field strength to meet the technical specifications, they need to arrange 5 pieces of motor stabilization magnetization, measure the motor no-load and load performance, test the magnetic field strength, and measure the magnetization waveform. The motor magnetization and motor stabilization must meet the established requirements before mass production can be carried out. When replacing the magnetization power supply and magnetizer, the technicians need to evaluate the complete magnetization saturation of the magnet, that is, the magnetization magnetic field intensity H should be greater than the saturation magnetic field intensity Hs, and then determine the magnetization voltage, and form a guidance document. At the same time, re-test and accept the above requirements before mass production can be carried out. When using magnets from different incoming batches, the test requirements should be repeated until acceptance is qualified before mass production can be carried out.

[0059] Embodiment 2: Take the data of 5pcs motor stator assembly magnetization and assembled motor stabilization (the stabilization voltage is 1.06 to 1.20 times the rated voltage of the stabilization motor, and the full-wave rectifier stalled motor is forced to demagnetize for 1 to 3 seconds). The motor is 230V / 5Hz (full-wave rectifier, juicer motor); the Gaussian intensity of the motor magnetic field before and after stabilization (the central magnetic field intensity specification after magnetization: 807.5-997.5 GAUSS), and the specific test data are shown in Table 1 below.

[0060] Table 1:

[0061] Serial number <![CDATA[ Before magnetic stabilization (GS)]]> <![CDATA[ After magnetic stabilization (GS)]]> Demagnetization difference (GS) <![CDATA[ Demagnetization Ratio (%)]]> 1# 912 770 142 15.57 2# 915 770 145 15.85 3# 913 779 134 14.68 4# 908 774 134 14.76 5# 907 778 129 14.22 average 911 774.2 136.8 15.02

[0062] The test magnetic field strength is the central magnetic field strength data, and the difference in demagnetization before and after stabilization is controlled within the range of (14±2)%. The motor magnet must be saturated with magnetization, and it is an external magnetization structure, and the whole machine is magnetized with the rotor; the permanent magnet should be fully magnetized during magnetization, that is, the magnetization magnetic field strength H should be greater than the saturation magnetic field strength Hs, in order to obtain the maximum possible magnetization demagnetization curve. Such a demagnetization curve is the most stable and has the best magnetic properties.

[0063] Example 3: Take 5 pcs of motor stator components, magnetize them and assemble the motor to stabilize the magnetism, and then measure the motor no-load performance data:

[0064] Motor performance before and after magnetic stabilization: no-load specification: 0.24-0.44A, no-load speed: 9600-1140rpm; specific test data are shown in Figure 2 below:

[0065] Table 2:

[0066]

[0067]

[0068] Supplementary measurement data assessment:

[0069] On-site quality control personnel use central magnetic field data for assessment and Tesla meter for measurement, which is easy to operate and can read data directly.

[0070] Laboratory technicians use the test instrument FW BELL guass / teslameter: Model 5180, Range: 0-30000GS, Hall probe model: STD18-0404, test software: Flux Scanning Program 1R2.

[0071] Laboratory technicians use 360° to test the magnetic field strength on the surface of the magnet. The gap between the test magnet and the magnet is less than 0.5mm. The unit of measurement is Gauss. According to the test fixture and the magnetic center position, the test position and zero calibration are verified. The surface magnetic field strength is equivalent to 1.5 times the center magnetic field data. The positive and negative magnetic field waveforms are geometrically symmetrical, and the positive and negative magnetic field data are the same. On the contrary, if there are problems with the magnetization parameters and magnetization fixtures, technical engineers need to analyze and deal with them. For details, Figure 1 and Figure 2 shown.

[0072] The direct stalling of the permanent magnet motor for forced demagnetization by the present invention under the existing technology seems to be unacceptable or an abnormal behavior. According to the magnetic stability technical issues of permanent magnet motors, the determination of the magnetic stability of the motor magnets and the stability of the working point must serve the reasonable motor design. This reasonable motor design includes the cost-quality-performance benefit balance and customer and market requirements. Ensuring that the motor does not lose magnetism during the entire process of customer requirements and design life is a necessary and sufficient condition for the design. The ultimate goal of magnetic stabilization is to prevent the motor from losing magnetism again. The purpose of magnetic stabilization is to make the motor performance stable and the life span meet the design requirements. By calculating the magnetic stability of the motor magnets and the stability of the working point, the motor stalling forced demagnetization method is boldly adopted. This technology is different from the existing magnetic stabilization technology, such as the methods adopted by motor industry enterprises, such as high and low temperature shock. The motor is started 5 times in both positive and negative directions at 1.1 times the rated voltage to verify that its no-load current should not exceed 1.05 times the current before the motor no-load test.

[0073] The magnetic stabilization in the present invention eliminates irreversible loss (demagnetization). In a permanent magnet DC motor, the maximum demagnetization magnetomotive force depends on the maximum instantaneous current that the motor may generate, which is related to the motor's operating state and working point. The magnetic stabilization treatment is at the expense of losing a portion of the magnetic properties of the permanent magnet, that is, according to the motor performance and working point requirements, the magnetic stabilization voltage and the stalling time are determined, and 100% of the permanent magnet motors are subjected to stalling tests, that is, magnetic stabilization treatment. A set of simple and easy-to-operate stalling tooling, that is, manual batch operation, is designed to force demagnetization of the full-wave rectified stalled motor for 1 to 3 seconds at a certain 1.06 to 1.20 rated voltage and power frequency. Calculate the maximum demagnetization effect that may occur, determine the position of the starting point of the recovery line, so that the starting point of the recovery line of the permanent magnet DC motor no longer drops under the specified or expected working state. Make the lowest local working point in the permanent magnet higher than the inflection point of the demagnetization curve to ensure that no local demagnetization occurs in the motor during the entire working process.

[0074] The magnetic stabilization tooling of the technical solution of the present invention is composed of a vehicle-mounted magnetic stabilization fixture, a magnetic stabilization power supply and a fixed work surface that can be connected to electricity. The magnetic stabilization fixture is easy to operate. The screw rod is rotated by a handle, and the sleeve is sleeved on the motor bracket. The blocking piece is deeply inserted into the slot of the motor shaft core, and the motor can be locked. The control switch is turned on to block the rotor. It is designed by itself, simple to process, easy to operate, and does not require complex tooling design. The existing blocking tooling systems are all in the laboratory. This simple design can be incorporated into the production line to implement 100% blocking of the motor to achieve the purpose of magnetic stabilization.

[0075] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A DC motor magnetic stabilization tool, characterized by: The invention comprises a base plate (1), a connecting plate (2), a mounting plate (3), a handle (4), a turntable (5), a lead screw (6), a screw (7), a slider assembly (8), a slide seat (9), a first pressing plate (10), a guide sleeve (11), a blocking piece (12), a first limiting column (13), a second limiting column (14), a second pressing plate (15), a large base plate (16), a bearing assembly (P1), a demoulding screw (P2), a motor fixing seat (B2), a guide plate (B9) and a mounting base plate (B7), wherein the motor fixing seat (B2) is installed on The base plate (B7) is mounted on the bottom plate (1), the base plate (1) and the guide plate (B9) are fixedly mounted on the large base plate (16), and the base plate (1) is located on one side of the guide plate (B9). The connecting plate (2) is assembled on the base plate (1), the mounting plate (3) is mounted on the outer side of the connecting plate (2), the slide seat (9) is mounted on the connecting plate (2), the slider assembly (8) is mounted on the slide seat (9) by means of screws (7), one end of the lead screw (6) is mounted in cooperation with the slider assembly (8), and the other end of the lead screw (6) passes through the mounting plate The bearing assembly (P1) on (3) is connected to the turntable, the pressure plate 1 (10) is installed on the slide seat (9) to form a slider box; the blocking piece (12) is installed in the guide sleeve (11), the guide sleeve (11) is installed on the side of the slider assembly (8) close to the motor fixing seat (B2), the limit column 1 (13) and the limit column 2 (14) are installed on the large bottom plate (16) on the other side of the installation bottom plate (B7), and the pressure plate 2 (15) is installed on the limit column 1 (13) and the limit column 2 (14). The large base plate (16) is fixed to the work surface by screws; the mounting base plate (B7) is also provided with a wiring clamp and a vehicle-mounted elastic contact 1 and a vehicle-mounted elastic contact 2; the wiring clamp is provided with a wiring clamp contact 1 (B5), a wiring clamp contact 2 (B6) and a wiring clamp button (B8); vehicle-mounted rolling wheels (B1) are provided on both sides of the mounting base plate (B7); the mounting base plate (B7) is placed on a guide plate (B9), and is positioned by being mounted on both sides of the guide plate (B9) through the vehicle-mounted rolling wheels (B1) on both sides.

2. A DC motor magnetic stabilization tooling according to claim 1, characterized in that: The vehicle-mounted elastic contact 1 is connected to the wiring clamp contact 1 (B5), and the vehicle-mounted elastic contact 2 is connected to the wiring clamp contact 2 (B6).

3. A DC motor magnetic stabilization tooling according to claim 2, characterized in that: The power output line of the magnetic stabilization control box is respectively connected to the bottom plate fixed contact 1 (A1) and the bottom plate fixed contact 2 (A2), and the vehicle-mounted elastic contact 1 (A3) and the vehicle-mounted elastic contact 2 (A4) are respectively in contact with the bottom plate fixed contact 1 (A1) and the bottom plate fixed contact 2 (A2).

4. A DC motor magnetic stabilization tooling according to claim 3, characterized in that: Connect the motor leads to the terminal clamp contact 1 (B5) and terminal clamp contact 2 (B6) according to the positive and negative poles.

5. A DC motor magnetic stabilization tooling according to claim 4, characterized in that: The control switch is connected to the magnetic stabilization control box, and the control switch directly switches on and off the magnetic stabilization voltage of the bottom plate fixed contact 1 (A1) and the bottom plate fixed contact 2 (A2).

6. A DC motor magnetic stabilization tooling according to claim 5, characterized in that: The handle (4) is mounted on the turntable (5) via a demoulding screw (P2).

7. A method for stabilizing magnetic field of a DC motor, characterized in that: The magnetic stabilization tooling according to claim 6 is used to stabilize magnetic field, specifically comprising the following steps: 1) The stator iron shell assembly with the magnet bonded is assembled into a permanent magnet DC motor through the front and rear brackets, the rotor assembly, and the positioning screws, and the motor is magnetized; 2) Check the magnetic field strength of the stator iron shell assembly with the magnet bonded, use a Tesla meter to check 4pcs / 2H, and then perform polarity detection; 3) Install carbon brush assemblies, springs, capacitor and inductor assemblies, cut and tie cables, and weld capacitor and inductor assemblies; 4) The motor is put into the vehicle for withstand voltage test, and the motor leads are connected to the vehicle according to the positive and negative pole markings; 5) Install the vehicle into the sports car fixture, and run the motor at rated voltage for 1 minute without load; 6) Confirm the parameters and set the magnetic stabilization voltage and time for this time; 7) Adjust the axial limit columns at the front and rear ends, place the vehicle-mounted motor in the middle of the magnetic stabilizing fixture, and make sure that the vehicle-mounted elastic contact 1 is in contact with the fixed contact 1 on the bottom plate of the work surface, and the vehicle-mounted elastic contact 2 is in contact with the fixed contact 2 on the bottom plate of the work surface; 8) Use the handle to adjust the stall piece counterclockwise and forward to make it penetrate into the slot at the end of the motor shaft core. Turn the motor shaft core to determine whether the rotor is fixed and whether the rear end of the motor bracket is inserted into the guide sleeve. 9) After confirming that the vehicle-mounted motor wiring is correct and that the motor rotor cannot rotate forward or reverse, start the control switch, implement magnetic stabilization treatment, and perform stalling. Without starting the control switch, there will be no voltage and current passing through. During the stalling process, it is necessary to visually check whether the carbon brushes emit instantaneous smoke and accompanying sparks. 10) After the stall is completed, turn the handle clockwise and move it backward, the stall piece will leave the motor, and a magnetic stabilization mark will be added; 11) The motor is taken out of the vehicle and subjected to vibration test, no-load test, load test, noise test, motor installation dimension measurement and appearance inspection in sequence, and finally the motor is packaged; 12) Life test: 5 pieces are randomly selected from each batch for performance, dynamometer and life test, and the life process data is recorded, and the magnetic field strength data after the life is tested.

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