A device and method for controlling the displacement of a position magnet steel press-fit of an electric motor

Abstract

A device and method for controlling the pressing displacement of a motor position magnet, belonging to the field of servo pressing technology, are disclosed. The device includes a frame for mounting the motor, a pressing head at the upper end of the frame, and a servo electric cylinder connected to a grating displacement sensor that drives the pressing head. A laser displacement sensor is located on the side of the pressing head opposite to the reference positioning surface, and a position magnet is magnetically attached to the bottom of the pressing head. The method includes four steps: installing the motor and the position magnet; measuring the distance *m* between the laser displacement sensor's output port and the upper surface of the position magnet; measuring the distance *L* between the laser displacement sensor and the motor's reference positioning surface; starting the servo electric cylinder; and stopping the servo electric cylinder after its output shaft has pressed down by a displacement of *L + h - m* from zero. This invention can precisely control the pressing displacement of the motor position magnet, ensuring the consistency and accuracy of product pressing; simultaneously, it can improve production cycle time and efficiency, and reduce the workload of workers.

Description

Technical Field

[0001] This invention belongs to the field of servo press-fitting technology, and relates to motor position magnet press-fitting technology, and in particular to a device and method for controlling the press-fitting displacement of motor position magnets. Background Technology

[0002] The press-fitting principle of a servo press typically involves a pressure sensor detecting a pressure surge during workpiece press-fitting to indicate that the press-fitting is complete. In this case, the workpiece is pressed onto the target workpiece's stop surface, signifying the press-fitting is finished. However, when press-fitting the position magnets onto the motor shaft, it is required that the distance h between the position magnet of each motor and the reference positioning surface of the motor housing be guaranteed. Due to the cumulative assembly error of each motor, the press-fitting completion cannot be determined by monitoring the pressure surge simply by pressing the position magnet onto the motor shaft's stop surface; this would compromise the accuracy of the h value.

[0003] Existing technologies mainly rely on manual pressing and measurement of the h value, which is inefficient, inaccurate, and cannot guarantee production cycle time. Therefore, to solve these problems, this invention proposes a device and method for controlling the displacement of the motor position magnet during pressing. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a device and method for controlling the displacement of the press-fitted magnet in a motor position, so as to solve the technical problem of poor measurement accuracy and low efficiency of the press-fitted displacement of the magnet in the motor position in the prior art, which leads to low production efficiency.

[0005] To achieve the above and other related objectives, the present invention provides a device for controlling the displacement of a motor position magnet during pressing, comprising a frame, a motor mounted at the bottom of the frame, a pressing head at the upper end of the frame, the center of the pressing head being on the same vertical line as the center of the motor shaft, the pressing head being driven to move up and down by a servo electric cylinder, a grating displacement sensor being connected to the servo electric cylinder, a laser displacement sensor being provided on the side of the pressing head opposite to the reference positioning surface of the motor, and a position magnet being magnetically attracted to the bottom of the pressing head.

[0006] Preferably, in any of the above embodiments, the bottom of the frame is provided with a T-shaped groove platform, an adjustable platform that can move along the T-shaped groove platform is connected to the T-shaped groove platform, and a motor mounting base is connected to the adjustable platform.

[0007] In any of the above embodiments, it is preferred that the upper surface of the motor mounting base is recessed downward to form a slot, and the motor is placed on the motor mounting base with the motor shaft extending into the slot.

[0008] Preferably, in any of the above embodiments, a motor anti-rotation stop is detachably connected to the adjustable platform, and the other end of the motor anti-rotation stop contacts the side surface of the motor body.

[0009] In any of the above embodiments, the preferred embodiment is that the pressure head is a T-shaped structure made of magnetic metal material, the laser displacement sensor is disposed on the lower surface of the horizontal end of the pressure head, and a mounting hole is provided at the bottom of the vertical end of the pressure head, into which the position magnet is magnetically attracted.

[0010] In any of the above embodiments, it is preferred that two guide columns are connected to the frame, and a baffle that can move up and down along the length of the guide columns is fitted on the two guide columns. The center of the upper surface of the baffle is fixedly connected to the output shaft of the servo electric cylinder through a connecting seat, and a pressure sensor is fixedly connected to the center of the lower surface of the baffle.

[0011] In any of the above embodiments, it is preferred that the pressure sensor is connected to a die head, and the upper end of the pressure head is inserted into the die shank hole of the die head and then fastened by radial bolts.

[0012] A method for controlling the displacement of a position magnet in a motor includes the following steps:

[0013] S1. Install the motor and position magnet respectively, so that the motor shaft and the center of the pressure head are on the same vertical line;

[0014] S2. Measure the distance m between the laser displacement sensor outlet and the upper surface of the position magnet;

[0015] S3. Measure the distance L between the laser displacement sensor and the reference positioning surface of the motor;

[0016] S4. Start the servo electric cylinder for pressing. During the pressing process, the grating displacement sensor detects the displacement in real time. When the output shaft of the servo electric cylinder starts to press down by a displacement of L+hm from zero, the servo electric cylinder stops, the pressing is completed, and the pressing head returns to its original position.

[0017] In any of the above solutions, it is preferred that, in step S1, during the motor installation process, the side surface of the motor contacts the motor anti-rotation stop.

[0018] Preferably, in any of the above embodiments, the laser displacement sensor and the grating displacement sensor are electrically connected to the control terminal, and the control terminal is electrically connected to the servo electric cylinder.

[0019] As described above, the device and method for controlling the displacement of a motor position magnet press-fitting according to the present invention have the following beneficial effects:

[0020] 1. In this invention, the pressing displacement of the magnet at the motor position can be precisely controlled to ensure the consistency and accuracy of product pressing.

[0021] 2. This invention can improve production cycle time and efficiency, and reduce the workload of workers. Attached Figure Description

[0022] Figure 1 The diagram shown is a schematic representation of the present invention.

[0023] Figure 2 The diagram shows the connection between the motor and the motor mounting base after the position magnet is press-fitted.

[0024] Figure 3 The diagram shows the press-fitting of the position magnet.

[0025] Figure 4 The diagram shows the installation of the motor anti-rotation stop.

[0026] Component designation explanation

[0027] 1-Frame; 2-Motor; 201-Motor shaft; 202-Reference positioning surface; 203-Motor body side profile; 3-Pressure head; 301-Connector; 4-Servo electric cylinder; 5-Grate displacement sensor; 6-Laser displacement sensor; 7-Position magnet; 8-Motor anti-rotation stop; 801-Connecting part; 802-Stop part; 9-Guide column; 10-Baffle; 11-Pressure sensor; 12-T-slot platform; 13-Adjustable platform; 14-Motor mounting base; 141-Bottom disc; 142-Mounting column; 143-Slot; 15-Connector; 16-Die head; 17-Linear bearing. Detailed Implementation

[0028] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0029] Please see Figures 1 to 4 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding and reading. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness and purpose of the invention, should still fall within the scope of the technical content disclosed in this invention. Furthermore, the terms such as "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention's implementation.

[0030] Example 1

[0031] Please see Figure 1-4This invention provides a device for controlling the displacement of a position magnet during press-fitting, comprising a frame 1, a motor 2 mounted at the bottom of the frame 1, and a pressing head 3 at the top of the frame 1. The center of the pressing head 3 is aligned vertically with the center of the motor shaft 201, ensuring that the pressing head 3 can drive the center of the position magnet 7 to coincide with the center of the motor shaft 201, thus facilitating press-fitting. A servo electric cylinder 4 is also mounted on the frame 1, and a grating displacement sensor 5 is connected to the servo electric cylinder 4. The displacement of the servo electric cylinder 4 is measured in real time by the grating displacement sensor 5, thereby accurately controlling the press-fitting amount. The pressing head 3 is connected to the output shaft of the servo electric cylinder 4. The servo electric cylinder 4 drives the pressing head 3 to move up and down, thereby moving the position magnet 7 and pressing the position magnet 7 onto the motor shaft 201.

[0032] When the position magnet 7 is pressed onto the motor shaft 201, it is required that the distance between the position magnet 7 of each motor 2 and the reference positioning surface 202 of the motor 2 housing be h. Therefore, in order to ensure precise control of the pressing amount, a laser displacement sensor 6 is set on the pressing head 3 in this embodiment. The outlet of the laser displacement sensor 6 is directly facing the reference positioning surface 202 of the motor 2, and is used to measure the distance L between the outlet of the laser displacement sensor 6 and the reference positioning surface 202. Since the assembly dimensions of each motor 2 have deviations, L is a variable value. The distance m between the outlet of the laser displacement sensor 6 and the upper surface of the position magnet 7 before pressing is also measured. Since the distance between the laser displacement sensor 6 and the position magnet 7 remains unchanged, m is a constant value. The displacement of the position magnet 7 before and after pressing is L+hm. When the grating displacement sensor 5 detects that the displacement of the servo electric cylinder 4 is L+hm, pressing is stopped to ensure that the distance between the position magnet 7 of each motor 2 and the reference positioning surface 202 of the motor 2 housing is h.

[0033] Therefore, this embodiment can overcome the assembly size deviation of motor 2. The system automatically calculates the current pressing displacement and uses the grating displacement sensor 5 to detect the pressing displacement to ensure that the distance between the position magnet 7 of each motor 2 and the reference positioning surface 202 of the motor 2 housing is h. It can also reduce the manual pressing process by manually measuring the h value, improve pressing accuracy and pressing efficiency, and ensure production cycle time.

[0034] In this embodiment, the emission port of the laser displacement sensor 6 is positioned opposite to the reference positioning surface 202 to ensure that the laser displacement sensor 6 can accurately measure the distance between itself and the reference positioning surface 202. The laser displacement sensor 6 is mounted on the pressure head 3 with screws, but is not limited to screw connection; other connection methods that enable detachable connection between the two are acceptable. For example, the laser displacement sensor 6 and the pressure head 3 can be connected by a snap-fit ​​connection.

[0035] In this embodiment, since the position magnet 7 is magnetic, it can be magnetically attracted to the pressure head 3 before pressing, reducing the step of manually installing the position magnet 7. Therefore, the pressure head 3 is made of a magnetic metal material.

[0036] As a further description of the above embodiment, in order to facilitate the adjustment of the position of the motor 2 and thus align the center of the motor shaft 201 with the center of the pressure head 3 to ensure pressing accuracy, a T-slot platform 12 is fixedly connected to the bottom of the frame 1 in this embodiment. An adjustable platform 13 is connected to the T-slot platform 12, and a motor mounting base 14 for mounting the motor 2 is connected to the adjustable platform 13. During operation, the adjustable platform 13 is used to adjust the center alignment between the motor shaft 201 and the pressure head 3. After adjustment, the adjustable platform 13 can be tightened with bolts.

[0037] Of course, a T-slot can also be recessed directly into the upper surface of the bottom of the frame 1, and the adjustable table 13 can be connected to the T-slot and can move along the length of the T-slot.

[0038] In this embodiment, the motor mounting base 14 includes a bottom disc 141 and a mounting post 142 that is fixedly connected to or integrally formed with the bottom disc 141. Three mounting holes are formed along the circumference of the bottom disc 141. Bolts pass through the mounting holes to connect the bottom disc 141 to the adjustable platform 13. A groove 143 is formed by a downward indentation in the middle of the upper surface of the mounting post 142. The groove 143 includes two interconnected slots. The inner diameter of the lower slot is clearance-fitted with the inner diameter of the motor shaft 201, preventing the motor shaft 201 from wobbling within the groove 143 and facilitating quick insertion and removal by the operator, thus ensuring the stability of the motor 2 after installation. Simultaneously, the inner diameter of the upper slot is larger than that of the lower slot, facilitating the insertion of the motor shaft 201. Furthermore, the depth of the slot 143 is less than the length of the motor shaft 201 after it extends out of the end face of the motor 2, thereby ensuring that there is a certain gap between the end face of the motor 2 and the end face of the motor mounting base 14 after the motor shaft 201 is inserted into the slot 143, ensuring that the motor shaft 201 can be inserted into the slot 143 for stable positioning, while ensuring that the motor shaft 201 is subjected to force during pressing while the motor body is not subjected to force, preventing the motor body from being pressed off and damaging the motor.

[0039] To prevent the motor 2 from rotating, a motor anti-rotation stop 8 is provided in this embodiment. The upper and lower ends of the motor anti-rotation stop 8 are bent in opposite directions to form a connecting part 801 and a stop part 802. The connecting part 801 has a connecting hole and is connected to the adjustable platform 13 by connecting bolts, and the stop part 802 contacts the side surface 203 of the motor body.

[0040] In this embodiment, the connecting part 801 is detachably connected to the adjustable platform 13 by bolts, which facilitates the adjustment of the position of the motor anti-rotation stop 8 according to the size of the motor 2, so that the motor anti-rotation stop 8 can always be in contact with the side surface 203 of the motor body, thereby preventing the motor 2 from rotating and ensuring stability during the pressing process.

[0041] As a further description of the above embodiment, the pressure head 3 is a T-shaped structure made of magnetic metal material. The laser displacement sensor 6 is disposed on the lower surface of the horizontal end of the pressure head 3. The bottom of the vertical end of the pressure head 3 is recessed upward to form a mounting hole for mounting the position magnet 7. The depth of the mounting hole is equal to the thickness of the position magnet 7, ensuring that the position magnet 7 contacts the upper wall of the mounting hole after being magnetically attracted into the mounting hole. This ensures that the distance between the laser displacement sensor 6 outlet and the upper surface of the position magnet 7 is a constant value m during each pressing. At the same time, the inner diameter of the mounting hole is equal to the maximum outer diameter of the position magnet 7, ensuring the stability of the position magnet 7 after installation and preventing the position magnet 7 from shaking or moving within the mounting hole, which would affect the pressing process.

[0042] To facilitate the connection between the pressure head 3 and the servo electric cylinder 4, a connector 301 is provided in the middle of the upper surface of the horizontal end of the pressure head 3 in this embodiment.

[0043] As a further description of the above embodiment, the two ends of the T-slot platform 12 are symmetrically connected to bases by connecting bolts. Each base is fixed with a guide post 9. A baffle 10 that can move up and down along the length of the guide post 9 is fitted on the two guide posts 9. The baffle 10 is connected to the guide post 9 by a linear bearing 17, so that the baffle 10 can move up and down smoothly along the length of the guide post 9, thereby ensuring the smoothness of the servo electric cylinder 4's up and down operation. A U-shaped clamping plate is connected to the top of the guide post 9, and the U-shaped clamping plate is clamped to the side plate of the frame 1.

[0044] In this embodiment, a connecting seat 15 is fixedly connected to the center of the upper surface of the baffle 10, and the output shaft of the servo electric cylinder 4 is fixedly connected to the baffle 10 through the connecting seat 15.

[0045] A pressure sensor 11 is fixedly connected to the center of the lower surface of the baffle 10. A die head 16 is connected to the lower surface of the pressure sensor 11. The connector 301 at the upper end of the pressure head 3 is inserted into the die shank hole of the die head 16 and then fastened by three radial screws, which facilitates the replacement of the pressure head 3.

[0046] In this embodiment, a pressure sensor 11 is provided between the die head 16 and the baffle 10. The pressure sensor 11 can detect the pressing force value in real time, so as to avoid the servo electric cylinder 4 being burned out due to excessive pressing force in an emergency. At the same time, when the pressing force reaches a certain pressure protection limit, the servo electric cylinder 4 will automatically stop its operation, thereby improving the safety of the device during use.

[0047] Example 2

[0048] A method for controlling the displacement of a position magnet in a motor includes the following steps:

[0049] S1. Before pressing, insert the motor shaft 201 into the motor mounting base 14 for positioning, and install the motor anti-rotation stop 8 to contact the side surface 203 of the motor body to position the motor 2 and prevent the motor 2 from rotating.

[0050] At the same time, the position magnet 7 is adsorbed onto the pressure head 3 made of magnetic metal material. The center of the motor shaft 201 and the pressure head 3 are aligned by adjusting the adjustable table 13. After adjustment, the adjustable table 13 is tightened.

[0051] S2. Measure the distance m between the laser displacement sensor 6 outlet and the upper surface of the position magnet 7;

[0052] S3. Measure the distance L between the laser displacement sensor 6 and the reference positioning surface 202 of the motor 2;

[0053] Because the assembly dimensions of each motor 2 have deviations, the measured L value will vary each time. This method can accurately detect the initial position of each motor 2. After pressing, the distance detected by the laser displacement sensor 6 to the surface of the position magnet 7 is L+h. The distance m between the laser displacement sensor 6 outlet and the upper surface of the position magnet 7 before pressing is a fixed value. Therefore, the displacement amount of pressing each time from zero point is L+hm. This ensures that the distance between the surface of the position magnet 7 and the positioning reference surface of the motor 2 is h after pressing.

[0054] S4. Start the servo electric cylinder 4 for pressing. During the pressing process, the grating displacement sensor 5 detects the displacement in real time. When the output shaft of the servo electric cylinder 4 starts to press down by a displacement of L+hm from zero, the servo electric cylinder 4 stops, the pressing is completed, and the pressing head 3 returns to its original position.

[0055] Laser displacement sensor 6 and grating displacement sensor 5 are electrically connected to the control terminal, which is in turn electrically connected to servo electric cylinder 4. The laser displacement sensor 6 and grating displacement sensor 5 transmit the test data to the control terminal in real time. The control terminal automatically calculates the current pressing displacement and, when the pressing displacement reaches the required value, controls the servo electric cylinder 4 to stop and then controls the pressing head 3 to return to its original position for the next pressing operation.

[0056] Therefore, the method for controlling the displacement of the motor position magnet in this embodiment can automatically calculate the pressing displacement, which is highly efficient, accurate, effectively ensures the production cycle, and reduces the workload of operators.

[0057] In summary, this invention can precisely control the pressing displacement of the magnet at the motor position, ensuring the consistency and accuracy of product pressing; at the same time, it can improve production cycle and efficiency, and reduce the workload of workers. Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0058] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for controlling the displacement of a motor position magnet during press-fitting, characterized in that: The device uses a magnet press-fitting device to control the displacement of the motor position. The device includes a frame (1), a T-slot platform (12) at the bottom of the frame (1), an adjustable platform (13) connected to the T-slot platform (12), a motor mounting base (14) connected to the adjustable platform (13), a motor (2) mounted on the motor mounting base (14), and a motor anti-rotation stop (8) detachably connected to the adjustable platform (13). The other end of the motor anti-rotation stop (8) is connected to the side of the motor body. (203) Contact, the upper end of the frame (1) is provided with a pressure head (3), the center of the pressure head (3) and the center of the motor shaft (201) are on the same vertical line, the pressure head (3) is driven to move up and down by a servo electric cylinder (4), the servo electric cylinder (4) is connected with a grating displacement sensor (5), the side of the pressure head (3) opposite to the reference positioning surface (202) of the motor (2) is provided with a laser displacement sensor (6), and the bottom of the pressure head (3) is magnetically attracted with a position magnet (7); The method includes the following steps: S1. Install the motor (2) and the position magnet (7) respectively, so that the center of the motor shaft (201) and the pressure head (3) are on the same vertical line; S2. Measure the distance m between the outlet of the laser displacement sensor (6) and the upper surface of the position magnet (7); S3. Measure the distance L between the laser displacement sensor (6) and the reference positioning surface (202) of the motor (2); S4. Start the servo electric cylinder (4) for pressing. During the pressing process, the grating displacement sensor (5) detects the displacement in real time. When the output shaft of the servo electric cylinder (4) starts to press down by a displacement of L+hm from zero, the servo electric cylinder (4) stops, the pressing is completed, and the pressing head (3) returns to its original position.

2. The method for controlling the displacement of the motor position magnet press-fitting according to claim 1, characterized in that: The upper surface of the motor mounting base (14) is recessed downward to form a slot (143). The motor (2) is placed on the motor mounting base (14) and the motor shaft (201) extends into the slot (143).

3. The method for controlling the displacement of the motor position magnet press-fitting according to claim 1, characterized in that: The pressure head (3) is a T-shaped structure made of magnetic metal material. The laser displacement sensor (6) is set on the lower surface of the horizontal end of the pressure head (3). The bottom of the vertical end of the pressure head (3) is provided with an installation hole. The position magnet (7) is magnetically attracted into the installation hole.

4. The method for controlling the displacement of the motor position magnet press-fitting according to claim 1, characterized in that: Two guide columns (9) are connected to the frame (1). A baffle (10) that can move up and down along the length of the guide column (9) is fitted on the two guide columns (9). The center of the upper surface of the baffle (10) is fixedly connected to the output shaft of the servo electric cylinder (4) through the connecting seat (15). A pressure sensor (11) is fixedly connected to the center of the lower surface of the baffle (10).

5. The method for controlling the displacement of the motor position magnet press-fitting according to claim 4, characterized in that: The pressure sensor (11) is connected to a mold head (16), and the upper end of the pressure head (3) is inserted into the mold shank hole of the mold head (16) and then tightened by radial bolts.

6. The method for controlling the displacement of the motor position magnet press-fitting according to claim 1, characterized in that: In S1, during the installation of the motor (2), the side surface (203) of the motor body comes into contact with the anti-rotation stop (8).

7. The method for controlling the displacement of the motor position magnet press-fitting according to claim 1, characterized in that: The laser displacement sensor (6) and the grating displacement sensor (5) are electrically connected to the control terminal, and the control terminal is electrically connected to the servo electric cylinder (4).

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