An assembly process for an array voice coil motor based on monolithic assembly

Abstract

An array voice coil motor assembly process based on integral assembly, the array voice coil motor comprising a magnet assembly, a coil assembly and a guide rail assembly, the assembly process comprising the steps of: using integral assembly method to assemble the magnet assembly to form the stator assembly of the array voice coil motor; assembling the coil assembly to form the rotor assembly of the array voice coil motor; installing the rotor assembly on the guide rail assembly, and putting the guide rail assembly with the installed rotor assembly into the stator assembly; judging whether the rotor assembly moves smoothly on the stator assembly, if yes, completing the assembly of the array voice coil motor. Since the integral assembly method is used to assemble the magnet assembly to form the stator assembly of the array voice coil motor, the demagnetization of the magnet in the stator assembly can be avoided.

Description

Technical Field

[0001] This invention relates to the field of array voice coil motor technology, and more specifically to an assembly process for array voice coil motors based on integral assembly. Background Technology

[0002] Because the stator of an array voice coil motor is composed of many strong permanent magnets, the assembly method is very demanding. If the assembly method is not appropriate, the magnets may undergo irreversible demagnetization, which will reduce the magnetic performance of the motor output. Summary of the Invention

[0003] To address the problem of demagnetization during the assembly of array-type voice coil motors, this application provides an assembly process for array-type voice coil motors based on integral assembly. The integral assembly method can avoid the occurrence of magnet demagnetization.

[0004] The technical solution of the present invention is as follows:

[0005] This invention provides an assembly process for an array-type voice coil motor based on integral assembly. The array-type voice coil motor includes a magnet assembly, a coil assembly, and a guide rail assembly. The assembly process for the array-type voice coil motor includes the following steps:

[0006] The magnet assembly is assembled using an integral assembly method to form the stator assembly of an array voice coil motor;

[0007] The coil components are assembled to form the mover assembly of an array-type voice coil motor;

[0008] Install the mover assembly onto the guide rail assembly, and place the guide rail assembly with the mover assembly installed into the stator assembly;

[0009] Determine whether the mover assembly moves smoothly on the stator assembly. If so, complete the assembly of the array voice coil motor.

[0010] More preferably, the magnet assembly includes: a magnetic yoke, a top fixing plate, a bottom fixing plate, edge permanent magnets, and a plurality of intermediate permanent magnets; the assembly of the magnet assembly using an integral assembly method specifically includes the following steps:

[0011] The intermediate permanent magnets are grouped and spliced ​​together according to a predetermined magnetic pole sequence to form individual groups of magnets.

[0012] The individual magnets are reassembled in a predetermined magnetic pole order to form the middle section magnet;

[0013] The edge permanent magnets are spliced ​​together, and the spliced ​​edge permanent magnets are then assembled onto the magnetic yoke;

[0014] The edge permanent magnets and the middle magnets are assembled on the magnetic yoke to form the stator of the array voice coil motor;

[0015] The stator is pressed into the bottom fixing plate, and then the stator is pressed into the top fixing plate to form the stator assembly of the array voice coil motor.

[0016] More preferably, the step of grouping and splicing the plurality of intermediate permanent magnets according to a predetermined magnetic pole order to form individual groups of magnets specifically includes the following steps:

[0017] Measure the polarity of each intermediate permanent magnet and mark the measured polarity;

[0018] A predetermined number of magnetic shielding sheets and a matching number of intermediate permanent magnets are grouped together, and the intermediate permanent magnets are sequentially spaced at equal distances at one end of the magnetic shielding sheet, with the same magnetic pole direction.

[0019] Intermediate permanent magnets with opposite polarity to the coaxial magnets are sequentially placed at the other end of the magnetic shielding sheet to form individual sets of magnets.

[0020] More preferably, the step of reassembling the individual magnets according to a predetermined magnetic pole order to form a middle section magnet specifically includes the following steps:

[0021] The magnetic shielding sheet is pre-placed between the splicing surfaces of the two single sets of magnets, and the magnetic shielding sheet is brought into contact with one of the single sets of magnets.

[0022] Place the belly of the single magnet that is not in contact with the magnetic shield against one side of the magnetic shield, and use this as a fulcrum to rotate the single magnet that is not in contact with the magnetic shield to the surface of the magnetic shield.

[0023] Advance the single magnets along the direction of magnetic attraction until the end faces of the two single magnets are flush, thus completing the splicing of the two single magnets. Repeat this process to splice the single magnets together to form the middle section magnet.

[0024] More preferably, the spliced ​​edge permanent magnets are assembled onto the magnetic yoke; specifically, this includes the following steps:

[0025] Two edge permanent magnets are spliced ​​together, and a magnetic shielding sheet is placed on the side of the spliced ​​edge permanent magnet closest to the yoke;

[0026] Place one end of the spliced ​​edge permanent magnet against one end of the magnetic yoke, and place the magnetic shielding sheet close to the magnetic yoke;

[0027] Keep the magnetic shielding sheet stationary, slide the two edge permanent magnets into the yoke, and then remove the magnetic shielding sheet from the yoke so that the two edge permanent magnets are completely in contact with the yoke.

[0028] More preferably, the assembly of the edge permanent magnet and the middle section magnet onto the yoke specifically includes the following steps:

[0029] Multiple magnetic shielding sheets are placed at one end of the middle section magnet, and the multiple magnetic shielding sheets are fixed together with the middle section magnet;

[0030] In the order of magnetic poles, attach the edge permanent magnet to one end of the middle section magnet where multiple magnetic isolation plates are set, release the constraint between the multiple magnetic isolation plates and the middle section magnet, so that the edge permanent magnet and the isolation plates are completely attached; in the same way, splice the other end of the edge permanent magnet to the middle section magnet.

[0031] Remove some of the magnetic shielding sheets between the edge permanent magnet and the middle section magnet, leaving two magnetic shielding sheets between the edge permanent magnet and the middle section magnet.

[0032] More preferably, after pressing the stator into the bottom fixing plate and the top fixing plate, the method further includes the step of removing the magnetic shielding sheets: removing the magnetic shielding sheets one by one from the middle of the middle section magnet to both sides.

[0033] More preferably, the coil assembly includes a plurality of coils and a plurality of coil supports, and the mounting of the mover assembly onto the guide rail assembly specifically involves fixing the coil supports onto the guide rail assembly.

[0034] According to the assembly process of the array voice coil motor in the above embodiment, since the magnet components are assembled using an integral assembly method to form the stator assembly of the array voice coil motor, the phenomenon of demagnetization of the magnets in the stator assembly can be avoided. Specifically: first, the middle permanent magnets are grouped and spliced ​​according to the predetermined magnetic pole order, then the individual groups of magnets are spliced ​​together to form the middle section magnet, then the edge permanent magnets are spliced, and the spliced ​​edge permanent magnets are assembled onto the yoke. Then, the edge permanent magnets assembled onto the yoke are assembled with the middle section magnets to form the stator of the array voice coil motor. Finally, the stator is pressed into the bottom fixing plate and the top fixing plate. This can avoid the phenomenon of irreversible demagnetization of permanent magnets due to the repulsion of magnetic fields of the same polarity during the installation process. Attached Figure Description

[0035] Figure 1 Flowchart of the assembly process for an array-type voice coil motor;

[0036] Figure 2 A schematic diagram of the stator assembly;

[0037] Figure 3 This is a schematic diagram of a single-group magnet splicing method;

[0038] Figure 4 This is a schematic diagram of the method for splicing two sets of single magnets.

[0039] Figure 5 A schematic diagram of the assembly process of the edge permanent magnet;

[0040] Figure 6 This is a schematic diagram of the assembly process of the middle section magnet and the edge permanent magnet;

[0041] Figure 7 A schematic diagram of the moving part assembly;

[0042] Figure 8 This is a schematic diagram of the stator assembly, mover assembly, and guide rail assembly. Detailed Implementation

[0043] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0044] The array-type voice coil motor of this application is mainly composed of a magnet assembly, a coil assembly, and a guide rail assembly. Specifically, it includes one set of magnet assemblies, 29 sets of coil assemblies, and one set of guide rail assemblies (containing 29 guide rails). The magnet assembly mainly comprises: 56 central permanent magnets, 4 edge permanent magnets, 2 magnetic yokes, a top fixing plate, and a bottom fixing plate. To prevent irreversible demagnetization of the assembled array-type voice coil motor, this application provides an assembly process for the array-type voice coil motor based on integral assembly, the flowchart of which is shown below. Figure 1 As shown, the specific steps include:

[0045] S100: The magnet assembly is assembled using an integral assembly method to form the stator assembly of an array voice coil motor.

[0046] S200: Assemble the coil assembly to form the mover assembly of the array voice coil motor.

[0047] S300: Install the mover assembly onto the guide rail assembly, and place the guide rail assembly with the mover assembly installed into the stator assembly.

[0048] S400: Determine whether the mover assembly moves smoothly on the stator assembly. If so, complete the assembly of the array voice coil motor.

[0049] In step S100, the magnet assembly is assembled using an integral assembly method, as shown in the specific assembly diagram below. Figure 2 As shown, the specific steps include:

[0050] S101: The intermediate permanent magnets are grouped and spliced ​​together according to a predetermined magnetic pole sequence to form individual groups of magnets.

[0051] In this step, the polarity of each intermediate permanent magnet is measured and the measured polarity is marked; a predetermined number of magnetic shielding sheets and a matching number of intermediate permanent magnets are grouped together, and the intermediate permanent magnets are separated at equal distances at one end of the magnetic shielding sheet according to the same magnetic pole direction; intermediate permanent magnets with opposite polarity to the coaxial polarity are placed at the other end of the magnetic shielding sheet in sequence, thereby forming each single group of magnets.

[0052] Specifically, measure the polarity of each intermediate permanent magnet and mark its surface with a marker, for example, using the same test surface of a teslameter to ensure consistent test reference polarity. Group the magnets into sets of 3-4 magnetic shielding sheets and 4-5 individual intermediate permanent magnets, aligning them with the same magnetic pole direction. At one end of each shielding sheet, space the individual intermediate permanent magnets equidistantly. Then, at the other end of the shielding sheet, place intermediate permanent magnets with opposite polarities to the coaxial polarity, thus forming individual sets of magnets. The method for assembling individual sets of magnets is as follows: Figure 3 As shown.

[0053] S102: Reassemble the individual magnets in a predetermined magnetic pole order to form the middle section magnet.

[0054] In this step, a magnetic shielding sheet is pre-placed between the splicing surfaces of the two individual magnets, and the magnetic shielding sheet is brought into contact with one of the individual magnets. The belly of the individual magnet that is not in contact with the magnetic shielding sheet is placed against one side of the magnetic shielding sheet, and using this as a fulcrum, the individual magnet that is not in contact with the magnetic shielding sheet is rotated and attached to the surface of the magnetic shielding sheet. The individual magnets are pushed forward in the direction of magnetic attraction until the end faces of the two individual magnets are flush, thus completing the splicing of the two individual magnets. This process is repeated to splice the individual magnets together to form the middle section magnet.

[0055] Specifically, the assembled individual magnets are joined together according to the predetermined magnetic pole order. First, a magnetic shield is pre-placed between the joining surfaces of two individual magnet sets. The belly of one set of magnets is placed against the side of the magnetic shield of the other set, and using this as a fulcrum, one end of the first set is slowly rotated and pressed against the surface of the second set's magnetic shield. Then, it is gently pushed in the direction of magnetic attraction until it is flush with the end face of the other set of magnets. The method is similar when joining multiple sets of magnets. The method for joining two sets of magnets is as follows: Figure 4 As shown.

[0056] It should be noted that when two sets of single magnets are placed together, the magnets at corresponding positions must be aligned as much as possible and not misaligned or offset, otherwise the magnets will undergo irreversible demagnetization.

[0057] It should be further noted that after the middle section magnet is assembled, there are still steps of testing and adjustment. The next step S103 will only be executed after the testing and adjustment are completed.

[0058] The inspection mainly refers to checking whether the distribution of air gap magnetic flux density amplitude at the center position of each axis of the assembled mid-section magnet is reasonable. If it is found that the air gap magnetic flux density of a certain axis is uneven, or the magnetic flux density amplitude differs greatly from that of adjacent axes, the magnet causing the large deviation in air gap magnetic flux density is identified, and then the magnet of that axis is adjusted (or replaced) until its air gap magnetic flux density distribution tends to be reasonable.

[0059] The adjustment mainly refers to the trial installation of the bottom and top fixing plates after ensuring the air gap magnetic flux density distribution of each shaft of the middle section stator magnet is normal. First, insert one end of the middle section magnet into the groove of the bottom fixing plate, then insert the other end into the groove of the top fixing plate. Observe whether the magnet is completely embedded in the grooves of the bottom and top fixing plates. If the magnet is not completely embedded, adjust the thickness of the magnetic shielding sheet on the corresponding shaft until the magnet is fully embedded. Finally, remove the bottom and top fixing plates.

[0060] S103: Assemble the edge permanent magnets and assemble the assembled edge permanent magnets onto the yoke.

[0061] In this step, two edge permanent magnets are spliced ​​together, and a magnetic shielding sheet is placed on the side of the spliced ​​edge permanent magnet that is close to the yoke; one end of the spliced ​​edge permanent magnet is placed against one end of the yoke, and the magnetic shielding sheet is close to the yoke; keeping the magnetic shielding sheet stationary, the two edge permanent magnets are slid into the yoke, and the magnetic shielding sheet is removed from the yoke so that the two edge permanent magnets are completely in contact with the yoke.

[0062] Specifically, first, join the two edge permanent magnets together, place a magnetic shielding sheet at the bottom, and slowly place one end against the end of the yoke. Then, keeping the magnetic shielding sheet stationary, slowly slide the magnet into the yoke, and finally gently remove the magnetic shielding sheet. The edge permanent magnet assembly process is as follows: Figure 5 As shown.

[0063] S104: The edge permanent magnets and the middle magnets assembled on the yoke are assembled to form the stator of the array voice coil motor.

[0064] In this step, multiple magnetic shielding sheets are placed at one end of the middle section magnet and fixed together with the middle section magnet; the edge permanent magnet is attached to the end of the middle section magnet where the multiple magnetic shielding sheets are placed according to the magnetic pole sequence, releasing the constraint between the multiple magnetic shielding sheets and the middle section magnet, so that the edge permanent magnet and the shielding sheets are completely attached; in the same way, the other end of the edge permanent magnet and the middle section magnet are spliced ​​together; some of the magnetic shielding sheets between the edge permanent magnet and the middle section magnet are removed, leaving two magnetic shielding sheets between the edge permanent magnet and the middle section magnet.

[0065] Specifically, first place about 5 magnetic shielding sheets at one end of the middle section magnet and tie them together with rubber bands. After confirming the magnet polarity of the two mounting surfaces, then, according to the required magnetic pole sequence, slowly attach one of the edge permanent magnets to one end of the middle section magnet, then slowly release it and remove the rubber band to ensure complete contact. Assemble the other end in the same way. Finally, remove some of the magnetic shielding sheets from the edge permanent magnet side, leaving 2 magnetic shielding sheets in the axial gap at each end for subsequent installation of the bottom and top fixing plates. Figure 6 As shown.

[0066] S105: Press the stator into the bottom fixing plate and then press the stator into the top fixing plate to form the stator assembly of the array voice coil motor.

[0067] Specifically, first press the stator into the bottom fixing plate and observe whether all magnets are fully inserted into their slots. If any magnet is not properly inserted, adjust the thickness of the corresponding magnetic shielding sheet until all magnets are in place. Then press in the top fixing plate and observe whether the magnets on each axis are fully inserted. If not, adjust the thickness of the magnetic shielding sheet until all magnets are fully inserted. Finally, use screws to slightly tighten the bottom fixing plate, top fixing plate, and stator. If the magnets still cannot be fully inserted, it is necessary to analyze whether the dimensions of the magnets or slots are properly machined, and whether the design of their fit is reasonable.

[0068] Furthermore, after pressing the stator into the bottom fixing plate and the top fixing plate, the process also includes the step of removing the magnetic shielding sheets: removing the magnetic shielding sheets one by one from the middle of the middle section of the magnet to both sides.

[0069] In step S200, the coil assembly is assembled to form the mover assembly of the array voice coil motor, as shown in the specific assembly diagram. Figure 7 As shown; wherein, the coil assembly includes a coil and a coil support, and the assembly process of the coil and the coil support includes the following steps:

[0070] 1. Inspect the appearance of the coil and coil support, key dimensions, coil resistance, and number of turns.

[0071] 2. Apply glue to the slot of the coil support, place the coil winding into the slot, and apply glue to both ends of the slot opening.

[0072] 3. Quickly clean the excess adhesive from the surface of the coil and the bracket, then place it in the shaping fixture and adjust the position of the coil so that it is in the middle of the coil bracket slot.

[0073] 4. Let it stand for about 2 hours to allow the adhesive to fully cure.

[0074] 5. Detect the coil winding resistance and the contact resistance between the coil and the coil support.

[0075] 6. Insert the lead wires into the insulating sleeves. To ensure the insulation effect between the lead wires, it is best to insert each lead wire into a separate insulating sleeve.

[0076] 7. Perform precision machining on the mounting face of the coil bracket. After precision machining, remove any excess material, and then test the coil resistance and the contact resistance between the coil and the bracket.

[0077] 8. Trim, scrape off the enamel, tin, and apply flux to the lead terminals; insert the flat tape connector into the insulating sleeve, tin, and apply flux. Note: To prevent the soldered end from contacting the bracket slot and conducting electricity, the soldered end of the flat tape connector must be inserted through the insulating sleeve. Note: When scraping off the enamel from the lead terminals, the scraping length should not exceed 2mm; the tinning length should also not be too long, otherwise, when the two wires cross each other after soldering, a short circuit may easily occur.

[0078] 9. Solder the lead wire terminals and the flat strip connecting wire together. Note that the soldering should be solid and firm, without any cold solder joints.

[0079] 10. Detect the resistance between the flat wire terminals and the contact resistance between the flat wire and the coil support.

[0080] 11. Apply adhesive to fix and insulate the soldering ends, then let stand and wait for the adhesive to fully cure.

[0081] 12. Check whether the resistance at the end of the flat strip connector and the contact resistance between it and the bracket are normal.

[0082] In step S300, the mover assembly is installed onto the guide rail assembly, and the guide rail assembly with the mover assembly installed is placed into the stator assembly; specifically, the coil bracket is fixedly installed onto the guide rail assembly, and the coil is inserted between adjacent intermediate permanent magnets.

[0083] Furthermore, the process includes the following steps: checking whether the position of the mover assembly is properly installed, whether the end face of the winding is centered and straight, whether there is any twisting or deformation, and whether there is any rubbing or contact with adjacent windings. If any winding is not centered or is in contact with adjacent windings, the gap between the coil support of the mover and the guide rail is adjusted to make it balanced and centered.

[0084] The steps also include: checking whether the coil is rubbing against the magnet or the bottom mounting plate; if the coil is rubbing against the magnet, adjusting the gap between the coil support and the guide rail; if it is rubbing against the bottom mounting plate, adding adjusting shims between the guide rail support and the top mounting plate.

[0085] In step S400, it is determined whether the mover assembly moves smoothly on the stator assembly. If so, the assembly of the array voice coil motor is completed. Specifically, after the mover assembly can move smoothly and reciprocally on the stator assembly, the screws can be tightened. The array voice coil motor assembly is complete. A detailed assembly diagram is shown below. Figure 8 As shown.

[0086] The array-type voice coil motor assembly process provided in this application avoids demagnetization of the magnets in the stator assembly by using an integral assembly method to assemble the magnet components. Specifically, the intermediate permanent magnets are first grouped and assembled according to a predetermined magnetic pole sequence. Then, the individual groups of magnets are assembled to form the middle section magnet. Next, the edge permanent magnets are assembled and then assembled onto the yoke. The edge permanent magnets assembled onto the yoke are then assembled with the middle section magnets to form the stator of the array-type voice coil motor. Finally, the stator is pressed into the bottom fixing plate and the top fixing plate. This avoids irreversible demagnetization of the permanent magnets due to repulsion of magnetic fields of the same polarity during installation.

[0087] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. An array voice coil motor assembly process based on monolithic assembly, characterized in that, The array voice coil motor comprises a magnet assembly, a coil assembly and a guide rail assembly, and the assembly process of the array voice coil motor comprises the following steps: The magnet assembly is assembled by using an integral assembly method to form a stator assembly of the array voice coil motor; The coil assembly is assembled to form a rotor assembly of the array voice coil motor; The rotor assembly is installed on the guide rail assembly, and the guide rail assembly with the installed rotor assembly is put into the stator assembly; It is judged whether the rotor assembly moves smoothly on the stator assembly, and if yes, the assembly of the array voice coil motor is completed; The magnet assembly comprises a yoke, a top fixed plate, a bottom fixed plate, edge permanent magnets and a plurality of intermediate permanent magnets; the magnet assembly is assembled by using the integral assembly method, and specifically comprises the following steps: The plurality of intermediate permanent magnets are grouped and spliced according to a predetermined magnetic pole sequence to form single-group magnets; The single-group magnets are spliced again according to the predetermined magnetic pole sequence to form a middle magnet; The edge permanent magnets are spliced and assembled on the yoke; The edge permanent magnets assembled on the yoke are assembled with the middle magnet to form a stator of the array voice coil motor; The stator is pressed into the bottom fixed plate, and then the stator is pressed into the top fixed plate to form the stator assembly of the array voice coil motor; The plurality of intermediate permanent magnets are grouped and spliced according to a predetermined magnetic pole sequence to form single-group magnets; specifically comprising the following steps: The polarity of each intermediate permanent magnet is measured, and the measured polarity is marked; A group of a predetermined number of magnetic separation sheets and a matching number of intermediate permanent magnets are taken, and the intermediate permanent magnets are sequentially arranged at equal distances on one end of the magnetic separation sheets according to the same magnetic pole direction; The intermediate permanent magnets with opposite coaxial polarity are sequentially arranged on the other end of the magnetic separation sheets to form the single-group magnets; The single-group magnets are spliced again according to the predetermined magnetic pole sequence to form a middle magnet; specifically comprising the following steps: The magnetic separation sheets are prepositioned between the splicing surfaces of the two single-group magnets, and the magnetic separation sheets are in contact with one of the single-group magnets; The abdomen of the single-group magnet not in contact with the magnetic separation sheets is attached to one side of the magnetic separation sheets, and the single-group magnet not in contact with the magnetic separation sheets is rotated and attached to the surface of the magnetic separation sheets as a fulcrum; The single-group magnets are pushed in the direction of magnetic attraction until the end surfaces of the two single-group magnets are flush, and the splicing of the two single-group magnets is completed, and the single-group magnets are sequentially spliced to form the middle magnet; The edge permanent magnets are spliced and assembled on the yoke; specifically comprising the following steps: The two edge permanent magnets are spliced together, and the magnetic separation sheets are arranged on the side of the spliced edge permanent magnets close to the yoke; One end of the spliced edge permanent magnets is attached to one end of the yoke, and the magnetic separation sheets are close to the yoke; The magnetic separation sheets are kept stationary, the two edge permanent magnets are slid into the yoke, and the magnetic separation sheets are pulled out of the yoke, so that the two edge permanent magnets are completely attached to the yoke; The edge permanent magnets assembled on the yoke are assembled with the middle magnet; specifically comprising the steps of: A plurality of magnetic separation sheets are placed on one end of the middle magnet, and the plurality of magnetic separation sheets are fixed with the middle magnet; In the magnetic pole sequence, the edge permanent magnet is attached to one end of the middle section magnet, a plurality of magnetic separation sheets are arranged, the constraint between the plurality of magnetic separation sheets and the middle section magnet is released, the edge permanent magnet is completely attached to the magnetic separation sheet, and the other end of the edge permanent magnet and the middle section magnet is spliced in sequence. Part of the magnetic separation sheets between the edge permanent magnet and the middle section magnet are extracted, and two magnetic separation sheets are reserved between the edge permanent magnet and the middle section magnet.

2. The array voice coil motor assembly process of claim 1, wherein, After the stator is pressed into the bottom fixed plate and the stator is pressed into the top fixed plate, the method further comprises the step of extracting the magnetic separation sheets: the magnetic separation sheets are extracted one by one from the middle to both sides of the middle section magnet.

3. The array voice coil motor assembly process of claim 1, wherein, The coil assembly comprises a plurality of coils and a plurality of coil supports, and the moving element assembly is mounted on the guide rail assembly, specifically, the coil supports are fixedly mounted on the guide rail assembly.

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