Moving coil framework structure for voice coil motor and coil winding method of moving coil framework structure

Abstract

The invention belongs to the field of voice coil motors, and particularly discloses a moving coil framework structure for a voice coil motor and a coil winding method thereof.The top of a framework is provided with a binding post, the lower end of the binding post is provided with a first cylindrical surface, the lower end of the first cylindrical surface is provided with a first coil groove, and the lower end of the first coil groove is provided with a second cylindrical surface; the lower end of the second cylindrical surface is provided with a second coil groove, and the lower end of the second coil groove is provided with a third cylindrical surface. A special-shaped groove is formed in the first cylindrical surface, the upper end of the special-shaped groove is communicated with the binding post, and the lower end of the special-shaped groove is communicated with the first coil groove; and the three coil slots are communicated through the lead slots in sequence. On the basis of a group of outgoing lines and according to a specific winding process, the winding directions of the coils in the adjacent coil grooves in the structure are opposite, and the beneficial effects that in a Halbach magnetic field, the output force is increased by three times compared with that of a single-coil groove structure, the overall structure is compact, and driving control is convenient are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of voice coil motors, and in particular to a moving coil skeleton structure for a voice coil motor and a coil winding method thereof. Background Art

[0002] The voice coil motor is a dynamic coil or moving iron linear reciprocating motor based on the Ampere force principle. It has the characteristics of high frequency response and large stroke. It is often used in motion modules, vibration testing, servo drives and other occasions in aviation and aerospace. With the requirements of precise driving and flexible control in application occasions, higher requirements are placed on the output displacement accuracy, size, thrust and other appearance and performance parameters of the voice coil motor.

[0003] Three sets of magnetic fields need to be set up in the dynamic Halbach voice coil motor structure with a three-coil structure. The magnetic fields between adjacent coils are opposite to each other. In order to make the force directions of the three sets of coils consistent, the current directions in adjacent coils are required to be opposite to each other. In order to make the driving simple and convenient, a set of lead wires is used to apply current to facilitate unified control of the current in multiple sets of coils. Summary of the invention

[0004] Purpose of the invention: In order to solve the above problems, the purpose of the present invention is to provide a dynamic coil skeleton structure for a voice coil motor and a coil winding method thereof, which uses a set of lead wires to make the current directions in adjacent coils in the three groups of coils opposite (the coils are wound in opposite directions), thereby making the force directions of the three groups of coils consistent, thereby increasing the output force of the coils.

[0005] Technical solution: In order to achieve the above-mentioned purpose, the dynamic coil skeleton structure for a voice coil motor provided by the present invention adopts the following technical solution: On the one hand, the present invention proposes a dynamic coil skeleton structure for a voice coil motor, wherein a terminal is provided at the top of the skeleton, a first cylindrical surface is provided at the lower end of the terminal, a first coil groove is provided at the lower end of the first cylindrical surface, a second cylindrical surface is provided at the lower end of the first coil groove, a second coil groove is provided at the lower end of the second cylindrical surface, a third cylindrical surface is provided at the lower end of the second coil groove, and a third coil groove is provided at the lower end of the third cylindrical surface; a special-shaped groove is arranged on the first cylindrical surface, the upper end of the special-shaped groove is connected with the terminal, and the lower end of the special-shaped groove is connected with the first coil groove; the three coil grooves are connected in sequence through the lead groove.

[0006] Furthermore, the special-shaped groove adopts a herringbone structure; the upper end confluence of the special-shaped groove is connected to the upper end terminal, and the lower end notch is connected to the first coil slot.

[0007] Furthermore, a lead-out wire groove is arranged in the terminal, and a partition is provided in the lead-out wire groove to divide the lead-out wire groove into two.

[0008] Furthermore, the special-shaped groove and the lead grooves between the three coil grooves are on the same straight line.

[0009] Furthermore, each layer in the first coil slot is wound with n1 turns, with a total of N1 layers of enameled wire with a wire diameter of d, and the first magnetic field passes through the first coil slot;

[0010] Each layer of the second coil slot is wound with n2 turns, with a total of N2 layers of enameled wire with a wire diameter of d, and the first magnetic field and the second magnetic field pass through the second coil slot;

[0011] Each layer in the third coil slot is wound with n3 turns, and there are N3 layers of enameled wire with a wire diameter of d in total. The second magnetic field passes through the third coil slot.

[0012] Furthermore, the direction of the first magnetic field in the first coil slot is opposite to the direction of the first magnetic field in the second coil slot; the direction of the second magnetic field in the second coil slot is opposite to the direction of the second magnetic field in the third coil slot, and is the same as the direction of the first magnetic field in the second coil slot.

[0013] Furthermore, the maximum outer diameters D of the first cylindrical surface, the second cylindrical surface, and the third cylindrical surface are the same;

[0014] The outer diameter D1 of the first coil slot, the outer diameter D2 of the second coil slot, and the outer diameter D3 of the third coil slot are all smaller than the maximum outer diameter D of the skeleton and meet the following size requirements:

[0015] D1<D-2*d*N1

[0016] D2<D-2*d*N2

[0017] D3<D-2*d*N3.

[0018] Furthermore, the width H1 of the first coil slot should be greater than n1*d, the width H2 of the second coil slot should be greater than n2*d, and the width H3 of the third coil slot should be greater than n3*d, where d is the diameter of the enameled wire.

[0019] Furthermore, after the enameled wires are arranged in the first lead-out wire groove, the second lead-out wire groove, the special-shaped groove, the first communication groove, and the second communication groove, they are filled with insulating glue, and the filled insulating glue shall not protrude beyond the maximum outer diameter D of the skeleton.

[0020] On the other hand, the present invention also proposes a method for winding a moving coil for a voice coil motor, using the coil skeleton structure designed as above, through a set of lead wires, so that the coils in the first coil slot and the second coil slot are wound in opposite directions, and the coils in the first coil slot and the third coil slot are wound in the same direction, and the specific winding process is as follows:

[0021] Clockwise and counterclockwise winding directions are defined by looking down at the coil frame with the coil frame placed vertically and the terminal facing upwards;

[0022] S1: Place one end of the enameled wire along the first lead-out groove and the right side of the special-shaped groove, and make the enameled wire start from the second intersection;

[0023] S2: Wind n1 turns downward in the first coil slot in a counterclockwise direction to the bottom of the first coil slot, and enter the second coil slot through the left side of the first communication slot;

[0024] S3: Wind n2 turns downward in the second coil slot in a clockwise direction to the bottom of the second coil slot, and enter the third coil slot through the right side of the second communication slot;

[0025] S4: Wind n3 turns downward in the third coil slot in a counterclockwise direction to the bottom of the third coil slot, then wind n3 turns upward counterclockwise to the upper end of the third coil slot, then wind n3 turns downward counterclockwise, repeat the cycle until the total number of layers meets N3 layers, and when the last layer is wound, the enameled wire enters the second coil slot from the left side of the second communication slot;

[0026] S5: Wind n2 turns upward in the second coil slot in a clockwise direction to the upper end of the second coil slot, and then wind n2 turns downward in a clockwise direction to the lower end of the second coil slot, repeating the cycle until the total number of layers meets N2 layers. When the last layer is wound, the enameled wire enters the first coil slot from the right side of the first communication slot;

[0027] S6: Wind n1 turns upward in the first coil slot in a counterclockwise direction to the upper end of the first coil slot, then wind n1 turns downward counterclockwise to the lower end of the first coil slot, and repeat the cycle until the total number of layers meets N1 layers. When the last layer is wound, the enameled wire enters the left side of the special-shaped groove and the second lead-out groove from the first intersection, and the winding is completed.

[0028] Compared with the existing coil frame structure, the present invention has the following advantages: the dynamic coil frame structure for the voice coil motor designed by the present invention and the coil winding method thereof, the coil frame is provided with three coil slots and a lead post, and a group of lead wires are wound in a certain order in the three coil slots, so that the winding directions of the coils in adjacent coil slots are opposite, thereby increasing the driving force of the coil. In terms of specific structural design, three coil slots are integrated in a coil frame, and according to the winding process proposed by the present invention, a group of lead wires are used, and the winding directions of adjacent coil slots in the three coil slots are opposite. In the Halbach magnetic field, the output force is increased three times compared with a single coil slot, the overall structure is compact, and the drive control is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is the axonometric view of the coil skeleton;

[0030] Figure 2 This is the front view of the coil skeleton.

[0031] Among them, the terminal 1, the first cylindrical surface 2, the first coil slot 3, the second cylindrical surface 4, the second coil slot 5, the third cylindrical surface 6, the third coil slot 7, the second lead 8, the first lead 9, the first magnetic field 10, the second magnetic field 11, the first lead-out slot 1.1, the second lead-out slot 1.2, the first intersection 2.1, the second intersection 2.2, the first communication slot 4.1, and the second communication slot 6.1. DETAILED DESCRIPTION

[0032] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the present invention is described in detail below in conjunction with the drawings or specific implementation cases of the specification. It should be noted that some (but not all) of the disclosed examples are shown in the drawings. In fact, many different examples can be described and these examples should not be understood as being limited to the examples set forth herein. On the contrary, these examples are described so that the positive effects of the present invention are more reflected, and any parts not detailed in the text are regarded as known techniques or conventional technical means in the art.

[0033] An embodiment of the present invention provides a dynamic coil frame structure for a voice coil motor and a coil winding method thereof. The coil frame is provided with three coil slots and a lead post. A group of lead wires are wound in the three coil slots in a certain order so that the winding directions of the coils in adjacent coil slots are opposite, thereby increasing the driving force of the coil.

[0034] Under the above design concept, an embodiment proposed by the present invention adopts the following technical solution:

[0035] like Figure 1 As shown, a specifically designed dynamic coil skeleton structure for a voice coil motor is shown, the skeleton is cylindrical as a whole, a terminal 1 is provided on the top of the skeleton, a first cylindrical surface 2 is provided at the lower end of the terminal 1, a first coil slot 3 is provided at the lower end of the first cylindrical surface 2, a second cylindrical surface 4 is provided at the lower end of the first coil slot 3, a second cylindrical surface 4 is provided at the lower end of the second cylindrical surface 4, a third cylindrical surface 6 is provided at the lower end of the second coil slot 5, and a third coil slot 7 is provided at the lower end of the third cylindrical surface 6;

[0036] like Figure 2 As shown, the terminal 1 is provided with a first lead-out wire groove 1.1 and a second lead-out wire groove 1.2;

[0037] The first lead wire 9 is arranged in the first lead wire slot 1.1, and the second lead wire 8 is arranged in the second lead wire slot 1.2;

[0038] A special-shaped groove 2.3 is provided on the first cylindrical surface 2, the upper end of which is connected to the first lead-out wire groove 1.1 and the second lead-out wire groove 1.2, and the lower end is connected to the first coil groove 3, and forms a first intersection 2.1 and a second intersection 2.2 with the first coil groove 3; in the specifically designed structure, the special-shaped groove 2.3 adopts a herringbone structure, the upper end is the confluence end, and the angle between the two branch grooves at the lower end is 60°, which are symmetrically arranged.

[0039] The second cylindrical surface 4 is provided with a first communication slot 4.1, connecting the first coil slot 3 and the second coil slot 5;

[0040] The third cylindrical surface 6 is provided with a second communication slot 6.1, connecting the second coil slot 5 and the third coil slot 7;

[0041] Each layer of the first coil slot 3 is wound with n1 turns, and a total of N1 layers of enameled wire with a wire diameter of d are wound around it. The first magnetic field 10 passes through the first coil slot 3;

[0042] Each layer of the second coil slot 5 is wound with n2 turns, and a total of N2 layers of enameled wire with a wire diameter of d are wound around it. The first magnetic field 10 and the second magnetic field 11 pass through the second coil slot 5;

[0043] Each layer of the third coil slot 7 is wound with n3 turns, and a total of N3 layers of enameled wire with a wire diameter of d are wound therein, and the second magnetic field 11 passes through the third coil slot 7;

[0044] The direction of the first magnetic field 10 in the first coil slot 3 is opposite to the direction of the first magnetic field 10 in the second coil slot 5; the direction of the second magnetic field 11 in the second coil slot 5 is opposite to the direction of the second magnetic field 11 in the third coil slot 7, and is the same as the direction of the first magnetic field 10 in the second coil slot 5;

[0045] The maximum outer diameters D of the first cylindrical surface 2, the second cylindrical surface 4, and the third cylindrical surface 6 are the same;

[0046] The outer diameter D1 of the first coil slot 3, the outer diameter D2 of the second coil slot 5, and the outer diameter D3 of the third coil slot 7 are all smaller than the maximum outer diameter D of the skeleton and meet the following size requirements:

[0047] D1<D-2*d*N1

[0048] D2<D-2*d*N2

[0049] D3<D-2*d*N3

[0050] The width H1 of the first coil slot 3 should be greater than n1*d, the width H2 of the second coil slot 5 should be greater than n2*d, and the width H3 of the third coil slot 7 should be greater than n3*d;

[0051] After the enameled wires are arranged in the first lead-out wire groove 1.1, the second lead-out wire groove 1.2, the special-shaped groove 2.3, the first communication groove 4.1, and the second communication groove 6.1, they are filled with insulating glue, and the filled insulating glue shall not protrude beyond the maximum outer diameter D of the skeleton;

[0052] In an operative manner, based on the dynamic coil skeleton structure for the voice coil motor of the present invention, the present invention further provides a coil winding method for the coil skeleton structure, wherein a group of lead wires are used to make the coils in the first coil slot 3 and the second coil slot 5 have opposite winding directions, and the coils in the first coil slot 3 and the third coil slot 7 have the same winding directions, as follows:

[0053] Note: Clockwise and counterclockwise winding directions are defined by looking down at the coil frame with the coil frame placed vertically and terminal 1 facing upwards;

[0054] S1: Place one end of the enameled wire along the first lead-out groove 1.1 and the right side of the special-shaped groove 2.3, and make the enameled wire start from the second intersection 2.2;

[0055] S2: Wind n1 turns downward in the first coil slot 3 in a counterclockwise direction to the bottom of the first coil slot 3, and enter the second coil slot 5 through the left side 4.1.1 of the first communication slot 4.1;

[0056] S3: Wind n2 turns downward in the second coil slot 5 in a clockwise direction to the bottom of the second coil slot 5, and enter the third coil slot 7 through the right side 6.1.2 of the second communication slot 6.1;

[0057] S4: Wind n3 turns counterclockwise downward in the third coil slot 7 to the bottom of the third coil slot 7, then wind n3 turns counterclockwise upward to the upper end of the third coil slot 7, then wind n3 turns counterclockwise downward, repeat the cycle until the total number of layers meets N3 layers. When the last layer is wound, the enameled wire enters the second coil slot 5 from the left side 6.1.1 of the second communication slot 6.1;

[0058] S5: Wind n2 turns upward in the second coil slot 5 in a clockwise direction to the upper end of the second coil slot 5, and then wind n2 turns downward in a clockwise direction to the lower end of the second coil slot 5, repeating the cycle until the total number of layers reaches N2 layers. When the last layer is wound, the enameled wire enters the first coil slot 3 from the right side 4.1.2 of the first communication slot 4.1;

[0059] S6: Wind n1 turns upward in the first coil slot 3 in a counterclockwise direction to the upper end of the first coil slot 3, then wind n1 turns downward counterclockwise to the lower end of the first coil slot 3, and repeat the cycle until the total number of layers meets N1 layers. When the last layer is wound, the enameled wire enters the left side of the special-shaped groove 2.3 and the second lead-out groove 1.2 from the first intersection 2.1, and the winding is completed.

[0060] Compared with the existing dynamic coil frame structure and winding method for voice coil motor, the present invention has the following advantages: three coil slots are integrated in one coil frame, and according to a specific winding process, a set of lead wires is used, and the winding directions of adjacent coil slots in the three coil slots are opposite. In the Halbach magnetic field, the output force is increased three times compared with that of a single coil slot, the overall structure is compact, and the drive control is convenient.

[0061] The above specific implementation methods or cases are only used to explain the technical solutions of the present invention, and are not intended to limit the present application. Any parts not described in detail are deemed to be conventional technical means or common knowledge in the field. It can be understood by ordinary technicians in this field that: based on the design concept of the present application, the technical solutions recorded in the aforementioned implementation methods should be adaptively modified, or some or all of the technical features therein should be replaced by equivalents. These modifications, equivalent replacements, and adaptively improved technical solutions do not depart from the technical essence of the present invention and should all be covered within the protection scope of the present application.

Claims

1. A moving coil skeleton structure for a voice coil motor, characterized in that: A terminal is provided on the top of the skeleton, a first cylindrical surface is provided at the lower end of the terminal, a first coil slot is provided at the lower end of the first cylindrical surface, a second cylindrical surface is provided at the lower end of the first coil slot, a second cylindrical surface is provided at the lower end of the second cylindrical surface, a second coil slot is provided at the lower end of the second cylindrical surface, a third cylindrical surface is provided at the lower end of the second coil slot, and a third coil slot is provided at the lower end of the third cylindrical surface; a special-shaped groove is arranged on the first cylindrical surface, the upper end of the special-shaped groove is connected with the terminal, and the lower end of the special-shaped groove is connected with the first coil slot; the three coil slots are connected in sequence through the lead groove.

2. A moving coil skeleton structure for a voice coil motor according to claim 1, characterized in that: The special-shaped groove adopts a herringbone structure, the upper end confluence of the special-shaped groove is connected with the upper end terminal, and the lower end notch is connected with the first coil groove.

3. The moving coil frame structure for a voice coil motor according to claim 1, characterized in that: A lead-out wire groove is arranged in the terminal post, and a partition is arranged in the lead-out wire groove to divide the lead-out wire groove into two.

4. The moving coil frame structure for a voice coil motor according to claim 1, characterized in that: The special-shaped groove and the lead grooves between the three coil grooves are on the same straight line.

5. The moving coil frame structure for a voice coil motor according to claim 1, characterized in that: Each layer of the first coil slot is wound with n1 turns, and a total of N1 layers of enameled wire with a wire diameter of d are wound around it, and the first magnetic field passes through the first coil slot; Each layer of the second coil slot is wound with n2 turns, with a total of N2 layers of enameled wire with a wire diameter of d, and the first magnetic field and the second magnetic field pass through the second coil slot; Each layer in the third coil slot is wound with n3 turns, and there are N3 layers of enameled wire with a wire diameter of d in total. The second magnetic field passes through the third coil slot.

6. A moving coil frame structure for a voice coil motor as claimed in claim 5, characterized in that: The direction of the first magnetic field in the first coil slot is opposite to the direction of the first magnetic field in the second coil slot; the direction of the second magnetic field in the second coil slot is opposite to the direction of the second magnetic field in the third coil slot, and is the same as the direction of the first magnetic field in the second coil slot.

7. A moving coil frame structure for a voice coil motor as claimed in claim 1, characterized in that: The maximum outer diameters D of the first cylindrical surface, the second cylindrical surface, and the third cylindrical surface are the same; The outer diameter D1 of the first coil slot, the outer diameter D2 of the second coil slot, and the outer diameter D3 of the third coil slot are all smaller than the maximum outer diameter D of the skeleton and meet the following size requirements: D1<D-2*d*N1 D2<D-2*d*N2 D3<D-2*d*N3.

8. A moving coil frame structure for a voice coil motor as claimed in claim 7, characterized in that: The width H1 of the first coil slot should be greater than n1*d, the width H2 of the second coil slot should be greater than n2*d, and the width H3 of the third coil slot should be greater than n3*d, where d is the diameter of the enameled wire.

9. The moving coil frame structure for a voice coil motor according to claim 1, characterized in that: After the enameled wires are arranged in the first lead-out wire groove, the second lead-out wire groove, the special-shaped groove, the first communication groove and the second communication groove, they are filled with insulating glue, and the filled insulating glue shall not protrude beyond the maximum outer diameter D of the skeleton.

10. A method for winding a moving coil for a voice coil motor, using the coil skeleton structure according to any one of claims 1 to 9, characterized in that: Through a set of lead wires, the coils in the first coil slot and the second coil slot are wound in opposite directions, and the coils in the first coil slot and the third coil slot are wound in the same direction. The specific winding process is as follows: Clockwise and counterclockwise winding directions are defined by looking down at the coil frame with the coil frame placed vertically and the terminal facing upwards; S1: Place one end of the enameled wire along the first lead-out groove and the right side of the special-shaped groove, and make the enameled wire start from the second intersection; S2: Wind n1 turns downward in the first coil slot in a counterclockwise direction to the bottom of the first coil slot, and enter the second coil slot through the left side of the first communication slot; S3: Wind n2 turns downward in the second coil slot in a clockwise direction to the bottom of the second coil slot, and enter the third coil slot through the right side of the second communication slot; S4: Wind n3 turns downward in the third coil slot in a counterclockwise direction to the bottom of the third coil slot, then wind n3 turns upward counterclockwise to the upper end of the third coil slot, then wind n3 turns downward counterclockwise, repeat the cycle until the total number of layers meets N3 layers, and when the last layer is wound, the enameled wire enters the second coil slot from the left side of the second communication slot; S5: Wind n2 turns upward in the second coil slot in a clockwise direction to the upper end of the second coil slot, and then wind n2 turns downward in a clockwise direction to the lower end of the second coil slot, repeating the cycle until the total number of layers meets N2 layers. When the last layer is wound, the enameled wire enters the first coil slot from the right side of the first communication slot; S6: Wind n1 turns upward in the first coil slot in a counterclockwise direction to the upper end of the first coil slot, then wind n1 turns downward counterclockwise to the lower end of the first coil slot, and repeat the cycle until the total number of layers meets N1 layers. When the last layer is wound, the enameled wire enters the left side of the special-shaped groove and the second lead-out groove from the first intersection, and the winding is completed.

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