VCM motor

Abstract

The utility model discloses a VCM motor which comprises a housing, a carrier is assembled at the middle position in the housing, a coil is assembled around the outer edge of the carrier, an upper elastic sheet is assembled above the coil, a lower elastic sheet is assembled below the coil, bases are assembled at the bottom end of the housing in a press fit mode, and the bottom ends of the two bases are connected with terminals. And a group of magnets are respectively assembled in a group of opposite angles in the shell. According to the VCM motor, the coils and the magnets are arranged, the electromagnetic induction efficiency is effectively improved by optimizing coil winding (increasing the wire diameter, increasing the wire length, keeping the resistance unchanged and increasing the number of winding coils), meanwhile, the traditional four-magnet configuration is changed into the diagonal distribution double-magnet design, the product of the wire length and the magnetic flux is kept unchanged, and the electromagnetic induction efficiency is improved. Therefore, the performance of the motor is not affected, the total material cost is reduced by 10%, the output torque and the response speed of the motor are kept unchanged while the cost is reduced, and the problem of high magnet cost is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of VCM motors, in particular to a VCM motor. Background Art

[0002] The open-loop square VCM (Voice Coil Motor) motor is a precision electromagnetic drive device that is widely used in high-precision control fields such as camera autofocus and hard disk drives. One of its core components is the internal magnet, which is usually configured with four magnets to form a stable magnetic field environment. These four sets of magnets are distributed at the four corners of the motor, and together provide continuous magnetic flux for the coil, ensuring that the motor can accurately respond to changes in electromagnetic force.

[0003] The four-magnet configuration means that the material cost of the motor is higher, and the magnet cost accounts for about 30% of the total material cost, which means the total material cost is higher. In addition, the four-magnet configuration also requires more complex and cumbersome assembly, and the assembly cost and labor cost will also increase accordingly.

[0004] Therefore, there is an urgent need for a VCM motor that can solve the technical defects mentioned in the above technology. Utility Model Content

[0005] The utility model aims to provide a VCM motor to solve the problem of high cost of four-magnet configuration proposed in the above background technology.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a VCM motor, comprising a shell, a carrier is installed in the middle position inside the shell, a circle of coil is installed around the outer edge of the carrier, an upper spring plate is installed above the coil, and a lower spring plate is installed below the coil. A base is press-fitted on the bottom end of the shell, and terminals are connected to the bottom ends of two groups of bases. A group of magnets is installed in each of the diagonals inside the shell.

[0007] Preferably, the magnets are embedded in the gap between the inner wall of the shell and the outer wall of the coil, and two groups of magnets are provided and distributed diagonally.

[0008] Preferably, the upper spring sheet is arranged around the top surface of the carrier, and the quadrilateral shape matches the outer shell.

[0009] Preferably, the shell is integrally formed, and the bent portion of the inner circle of the shell is embedded downward into the gap between the carrier and the coil.

[0010] Preferably, the lower spring sheet is connected to the terminal by laser welding, and the terminal is connected to an external electric control system.

[0011] Compared with the prior art, the utility model has the following beneficial effects: the VCM motor not only reduces the cost, but also ensures that the output torque and response speed of the motor remain unchanged, improves the stability of the internal components, ensures that the micro-motion function of the motor is not affected, and realizes the automatic focusing function without the need for a closed-loop control system;

[0012] By setting up coils and magnets, the motor effectively improves the electromagnetic induction efficiency by optimizing the coil winding (increasing the wire diameter, increasing the wire length to keep the resistance unchanged, and increasing the number of windings). At the same time, the traditional four-magnet configuration is changed to a diagonally distributed double-magnet design to keep the product of the wire length and the magnetic flux unchanged, thereby ensuring that the motor performance is not affected. The winding cost increases by 5%, and the magnet cost, which accounts for about 30% of the total material cost, is reduced by 15%, and the total material cost is reduced by 10%. While reducing costs, the output torque and response speed of the motor are guaranteed to remain unchanged;

[0013] The motor is assembled in a compact manner by providing an upper spring sheet, a lower spring sheet, a base, a coil, a carrier, and a shell. The upper spring sheet and the lower spring sheet are respectively arranged according to the size of the coil and the carrier, and matched with the shape of the shell. The inner circle bending part of the shell is embedded downward into the gap between the carrier and the coil, which not only improves the stability of the internal components, but also ensures that the micro-motion function of the motor is not affected, optimizes the use of the internal space of the motor, and improves the overall reliability and durability of the motor.

[0014] The lower spring sheet, terminal, coil, magnet and carrier are provided. The lower spring sheet and the terminal are connected by laser welding. When the terminal is energized, the coil generates magnetic force. Under the action of the diagonal double magnet magnetic field, the carrier and the coil are driven to move vertically upward according to the current size. When positive current is passed, the coil moves upward, and when negative current is passed, the coil moves downward, thereby realizing the autofocus function. No closed-loop control system is required, which simplifies the overall structure, reduces manufacturing and maintenance costs, and improves the response speed and accuracy of the system. It is particularly suitable for application scenarios requiring high-speed autofocus. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the cross-sectional structure of the utility model;

[0016] Figure 2 This is a front view structural schematic diagram of the utility model;

[0017] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model in a top view;

[0018] Figure 4 It is a schematic diagram of the top structure of the utility model.

[0019] In the figure: 1. housing; 2. upper spring piece; 3. coil; 4. carrier; 5. magnet; 6. lower spring piece; 7. base; 8. terminal. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] Example 1: Please refer to Figure 1-4 A VCM motor comprises a housing 1, a carrier 4 is mounted in the middle of the housing 1, a coil 3 is mounted around the outer edge of the carrier 4, an upper spring sheet 2 is mounted above the coil 3, a lower spring sheet 6 is mounted below the coil 3, a base 7 is mounted at the bottom of the housing 1, two groups of bases 7 are connected to the bottom ends of the terminals 8, a group of magnets 5 are mounted in each of the diagonals of the housing 1, the magnets 5 are embedded in the gap between the inner wall of the housing 1 and the outer wall of the coil 3, two groups of magnets 5 are arranged and distributed diagonally, the upper spring sheet 2 is arranged around the top surface of the carrier 4, and the shape of the four corners matches the housing 1;

[0022] Specifically, Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the motor effectively improves the electromagnetic induction efficiency by optimizing the winding of the coil 3 (increasing the wire diameter, increasing the wire length to keep the resistance unchanged, and increasing the number of winding turns). At the same time, the traditional four-magnet 5 configuration is changed to a diagonally distributed double magnet 5 design to keep the product of the wire length and the magnetic flux unchanged, thereby ensuring that the motor performance is not affected. The winding cost is increased by 5%, and the cost of the magnet 5, which accounts for about 30% of the total material cost, is reduced by 15%, and the total material cost is reduced by 10%. While reducing the cost, the output torque and response speed of the motor are guaranteed to remain unchanged.

[0023] Embodiment 2: The housing 1 is integrally formed, and the inner circle bent portion of the housing 1 is embedded downward into the gap between the carrier 4 and the coil 3;

[0024] Specifically, Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the motor adopts a compact assembly method. The upper spring plate 2 and the lower spring plate 6 are respectively set according to the sizes of the coil 3 and the carrier 4, and match the shape of the shell 1. The inner circle bending part of the shell 1 is embedded downward into the gap between the carrier 4 and the coil 3, which not only improves the stability of the internal components, but also ensures that the micro-motion function of the motor is not affected.

[0025] Embodiment 3: The lower spring sheet 6 is connected to the terminal 8 by laser welding, and the terminal 8 is connected to the external electric control system;

[0026] Specifically, Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the lower spring piece 6 is connected to the terminal 8 by laser welding. When the terminal 8 is energized, the coil 3 generates magnetic force. Under the action of the magnetic field of the diagonal double magnets 5, the carrier 4 and the coil 3 are driven to move vertically upward depending on the current. When a positive current is passed, it moves upward, and when a negative current is passed, it moves downward, thereby realizing the autofocus function without the need for a closed-loop control system.

[0027] Working principle: The motor starts working after receiving the current signal. The current first flows into the coil 3 through the terminal 8. When the current passes through the coil 3, the magnetic field generated interacts with the diagonally placed magnet 5, driving the carrier 4 and the coil 3 to move vertically. The upper spring 2 and the lower spring 6 tighten and guide the carrier 4 and the coil 3 to ensure that they move smoothly in the vertical direction. When the coil 3 is energized, the positive current will move the carrier 4 and the coil 3 upward, and the negative current will move them downward. This up and down movement realizes the autofocus function of the VCM motor. When the motor stops receiving current, the carrier 4 and the coil 3 stop moving due to the lack of electromagnetic force.

[0028] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A VCM motor, comprising a housing (1), characterized in that: A carrier (4) is mounted in the middle of the shell (1), a coil (3) is mounted around the outer edge of the carrier (4), an upper spring sheet (2) is mounted above the coil (3), and a lower spring sheet (6) is mounted below the coil (3). A base (7) is pressed and mounted at the bottom end of the shell (1), and terminals (8) are connected to the bottom ends of the two groups of bases (7). A group of magnets (5) is mounted in each of the two diagonal groups inside the shell (1).

2. A VCM motor according to claim 1, characterized in that: The magnets (5) are embedded in the gap between the inner wall of the housing (1) and the outer wall of the coil (3), and two groups of magnets (5) are provided and distributed diagonally.

3. A VCM motor according to claim 1, characterized in that: The upper spring sheet (2) is arranged around the top surface of the carrier (4), and the shape of the four corners matches the outer shell (1).

4. A VCM motor according to claim 1, characterized in that: The shell (1) is integrally formed, and the inner ring bent portion of the shell (1) is embedded downwardly into the gap between the carrier (4) and the coil (3).

5. A VCM motor according to claim 1, characterized in that: The lower spring sheet (6) is connected to the terminal (8) by laser welding, and the terminal (8) is connected to an external electric control system.

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