Electric mechanism with controllable vertical position

Abstract

The invention discloses an electric mechanism with a controllable vertical position. The electric mechanism comprises a motor shell, a coil assembly and a rotor assembly. By means of the structure that the bottom of the magnetic conductive shell protrudes inwards, resetting can be achieved without using a spring, and controllable ascending, descending and hovering of the rotor are achieved by controlling the magnitude of direct current in the two sets of coils; a cylindrical or polygon prism structure is adopted, so that the utilization rate of the permanent magnets and the windings is improved, the magnetic leakage is reduced, and the integrity is improved; a moving magnet type rotor is adopted, so that the impact inertia of the rotor is increased, and the risk that a winding coil breaks down is reduced; the built-in permanent magnets are adopted, so that the use amount of the permanent magnets is reduced, and the manufacturing cost is reduced; the two winding coils with different turns are used, so that the position of the rotor can be controlled; the bottom of the magnetic conductive shell of the motor protrudes inwards by a circle, so that the motor can fall back and hover at an initial position when in no load, a spring does not need to be used for resetting, and the initial position can be adjusted by adjusting a circle of inner ring protruding from the bottom.

Description

Technical Field

[0001] The present invention relates to an electric mechanism, specifically an electric mechanism with controllable vertical position, belonging to the technical field of reset electromagnets. Background Art

[0002] Push-pull type, switch-on-and-off type, and knocking type electromagnets rely on springs for reset. In addition, the magnet holding force is greater than the initial suction force, resulting in waste. Once the stroke exceeds the holding position, the output force is in the opposite direction, and this is the maximum output force position at this time; if there is looseness during knocking, the knocking effect will be significantly reduced, and at the same time, the reset process is uncontrollable, and it is impossible to ensure the falling time in key strikes such as electronic pianos. The knocking type electromagnet has a simple structure. After passing through direct current, the middle iron core can be suspended and fixed by magnetic pulling force; if the iron core is to be lowered, the current needs to be reduced, thereby reducing the magnetic pulling force. Once the magnetic pulling force is less than the gravity, the middle iron core will directly fall to the bottom, and it is impossible to control the position of the mover in the vertical direction. It is difficult to be applied to scenarios that require two-way control. For example, when applied to an electronic piano, when pressing a key, the mover needs to quickly rise to strike the hammer to pluck the string, and then the mover needs to be controllably lowered, or controllably hover during the lowering process to control the aftertone duration; when the piano sound needs to stop, the mover is lowered to the initial position. Summary of the Invention

[0003] The purpose of the present invention is to provide an electric mechanism with controllable vertical position to solve at least one of the above technical problems, realizing controllable rising, falling, and hovering of the mover, and ensuring no reliance on springs, small volume, low energy consumption, and simple control.

[0004] The present invention realizes the above purpose through the following technical solutions: An electric mechanism with controllable vertical position includes a motor housing, a coil assembly, and a mover assembly. The coil assembly and the mover assembly are both arranged inside the motor housing, and the mover assembly is sleeved inside the coil assembly; The coil assembly includes a first coil and a second coil, which are arranged in an up-and-down distribution. The mover assembly includes a yoke unit and a magnet unit, and the yoke unit and the magnet unit are arranged in a stacked manner.

[0005] As a further scheme of the present invention: The housing of the motor housing is made of a magnetic conductive material, and the shape of the housing of the motor housing includes but is not limited to a cylindrical structure or a prism-shaped structure.

[0006] As a further scheme of the present invention: The bottom end of the motor housing is integrally connected with an inwardly convex edge, and the bottom end of the mover assembly is supported on the inwardly convex edge.

[0007] As a further solution of the present invention: The coil assembly further includes a coil skeleton, the middle part of the body of the coil skeleton is fixedly connected to the inner wall of the motor housing, and the first coil and the second coil are both wound around the coil skeleton.

[0008] As a further solution of the present invention: The number of turns of the winding of the first coil is greater than that of the second coil.

[0009] As a further solution of the present invention: The yoke unit of the mover assembly includes a first annular yoke and a second annular yoke, the magnet unit of the mover assembly includes a permanent magnet, and the first annular yoke and the second annular yoke are respectively connected to the upper and lower ends of the permanent magnet.

[0010] The beneficial effects of the present invention are: 1) The present invention utilizes the structure in which the bottom of the magnetic conductive housing protrudes inward to achieve reset without using a spring, and has a small volume, low energy consumption, and simple control. By controlling the magnitude of the direct current in the two groups of coils, the mover can be controllably lifted, lowered, and hovered. 2) The present invention adopts a cylindrical or polygonal prism structure, which improves the utilization rate of permanent magnets and windings, reduces magnetic leakage, and improves integrity; adopts a moving magnet type mover, which increases the impact inertia of the mover and reduces the risk of failure of the winding coil; adopts an internal permanent magnet, which reduces the amount of permanent magnet used and lowers the manufacturing cost; uses two winding coils with different numbers of turns, enabling the position of the mover to be controllable; the bottom of the motor magnetic conductive housing protrudes inward in a circle, enabling the motor to fall back and hover at the initial position when no load, without using a spring for reset, and the initial position can be adjusted by adjusting the inner ring of the protruding circle at the bottom. 3) The electric mechanism proposed by the present invention has good application prospects in occasions where position control in the vertical direction is required, such as electronic pianos. Description of the Drawings

[0011] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the sectional structure of the present invention; Figure 3 It is a schematic diagram of the axial magnetization structure of the mover assembly of the present invention; Figure 4 It is a schematic diagram of the radial magnetization structure of the mover assembly of the present invention; Figure 5 It is a schematic diagram of the parameter marking structure of the present invention; Figure 6 It is a schematic diagram of the magnetic field line distribution structure when the present invention is no-load; Figure 7 It is a schematic diagram of the waveform of the magnetic field force received by the mover when the present invention is no-load; Figure 8Schematic diagram of the magnetic field when current is applied to the present invention; Figure 9 Thrust waveform diagram of the mover when current is applied to the present invention; In the figure: 1. Motor housing, 11. Inner convex edge, 2. Coil bobbin, 21. First coil, 22. Second coil, 3. Mover assembly, 31. First annular yoke, 32. Permanent magnet, 33. Second annular yoke. Specific embodiments

[0012] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0013] Embodiment 1, as Figures 1 to 2 shown, an electric mechanism with controllable vertical position includes a motor housing 1, a coil assembly, and a mover assembly 3. The coil assembly and the mover assembly 3 are both arranged inside the motor housing 1, and the mover assembly 3 is sleeved inside the coil assembly; The coil assembly includes a first coil 21 and a second coil 22. The first coil 21 and the second coil 22 are arranged in an up-and-down distribution. The mover assembly 3 includes a yoke unit and a magnet unit, and the yoke unit and the magnet unit are arranged in a stacked manner.

[0014] Embodiment 2, in addition to including all the technical features in Embodiment 1, further includes: the housing of the motor housing 1 is made of a magnetic conductive material, and the shape of the housing of the motor housing 1 includes but is not limited to a cylindrical structure or a polygonal prism structure. Using a magnetic conductive material for the housing can more effectively guide magnetic field lines, and by adopting a specific shape, the utilization rate of the coil assembly and the mover assembly 3 inside the housing can be improved, the occurrence of magnetic leakage can be reduced, and the structural integrity of the electric mechanism can be improved.

[0015] The bottom end of the motor housing 1 is integrally connected with an inner convex edge 11, and the bottom end of the mover assembly 3 is supported on the inner convex edge 11. When the electric mechanism is in an idle state, the upward magnetic force and gravity received by the mover assembly 3 at the initial position at the bottom are equal, and when the mover assembly 3 is higher than the initial position, the upward magnetic force received by the mover assembly 3 is less than the gravity or the direction of the magnetic force is downward, so that the mover assembly 3 can fall back and hover at the initial position, realizing the function of resetting the mover assembly 3 without using a spring, and the initial position can be adjusted by adjusting a circle of inner rings of the bottom protrusion.

[0016] The coil assembly further includes a coil bobbin 2. The middle part of the body of the coil bobbin 2 is fixedly connected to the inner wall of the motor housing 1. The first coil 21 and the second coil 22 are both wound around the coil bobbin 2, enabling the first coil 21 and the second coil 22 to be arranged in a surrounding shape outside the mover assembly 3. Thus, when the first coil 21 and the second coil 22 are energized, the generated magnetic field drives the mover assembly 3 to move, without the need for the coil assembly to move, reducing the risk of failures caused by the movement of the coil assembly.

[0017] The number of turns of the winding of the first coil 21 is greater than that of the second coil 22. By simultaneously adjusting the magnitudes of the direct currents applied to the first coil 21 and the second coil 22, the mover assembly 3 can be controllably raised, lowered, and hovered, that is, the position of the mover assembly 3 can be controlled.

[0018] The yoke unit of the mover assembly 3 includes a first annular yoke 31 and a second annular yoke 33. The magnet unit of the mover assembly 3 includes a permanent magnet 32. The first annular yoke 31 and the second annular yoke 33 are respectively connected to the upper and lower ends of the permanent magnet 32. By placing the permanent magnet 32 inside the first annular yoke 31 and the second annular yoke 33, the amount of the permanent magnet 32 is reduced, and the manufacturing cost is lowered.

[0019] Embodiment Three, as Figure 3 and Figure 4 shown, an electric mechanism with controllable vertical position. The mover can be composed of two annular yokes sandwiching a ring-shaped axially magnetized permanent magnet. The use of an internal permanent magnet reduces the amount of the permanent magnet compared to an external one; the mover can also adopt a structure with two radially magnetized ring-shaped permanent magnets sandwiching an annular yoke in the middle, and the principle and function are the same as those of axial magnetization.

[0020] As Figure 5 shown, the height of the first coil 21 is h c1 , the height of the coil 2 is h c2 , under the condition of the same current density, it is required that h c1 > h c2 , that is, the number of turns of coil 1 is greater than that of coil 2.

[0021] The height of the permanent magnet is h PM , the height of the upper yoke is h y1 , the height of the lower yoke is h y2 , it is required that h y1 > h y2 , h PM + h y2 = h d , h PM + h y1 = h c1 .

[0022] AsFigures 6 to 9 As shown, for an electric mechanism with controllable vertical position, when it is no-load, the magnetic field line distribution diagrams of the electric mechanism with the mover at different positions are as Figure 6 shown, and the waveform diagram of the magnetic field force received by the mover is as Figure 7 shown. z Let z be the upward moving distance of the mover from the initial position F =0, Figure 6 be the magnitude of the magnetic field force received by the mover, and G be the magnitude of the gravity received by the mover. When the motor is no-load, the magnetic force received by the mover at the initial positions shown in Figure 7 (a)and z (a)is equal to the gravity of the mover. At this time, the mover hovers at the initial position; when the mover is higher than the initial position z =0, the upward magnetic field force received by the mover is less than the gravity or the direction of the magnetic field force is downward, so that the mover can fall back to and hover at the initial position. Therefore, the structure proposed in the present invention that makes a circle of protrusions at the bottom of the magnetic conductive housing realizes the function of resetting the mover without using a spring, and the initial position can be adjusted by adjusting the inner ring of the circle of protrusions at the bottom.

[0023] After direct current is simultaneously passed through the two groups of coils of the mover, the magnetic field distributions of the electric mechanism at different positions are as Figure 8 shown. The schematic diagram of the thrust curve received by the mover when different magnitudes of direct current I1 and I2 are passed through the electric mechanism is as Figure 9 shown. When direct current I1 is simultaneously passed through coil 1 and coil 2 at the initial position, the directions of the magnetic field forces generated by the interaction between coil 1, coil 2 and the permanent magnet received by the mover are all upward. At this time, the magnetic field force received by the mover is greater than the gravity of the mover, and the mover accelerates upward. As the mover rises, the magnetic field force received by the mover gradually decreases. As shown in Figure 8 (b), when the mover rises by h PM , the upper end of the yoke 1 is horizontally aligned with the upper end of coil 1, and the lower end of the permanent magnet is horizontally aligned with the lower end of coil 1. As shown in Figure 8 (c), when the mover rises to a position exceeding h PM , the magnetic field passing through the upper part of coil 1 makes the mover receive an upward magnetic field force, while the magnetic field passing through the lower part of coil 1 makes the mover receive a downward magnetic field force, and as the mover rises, the contact area between the upper part of coil 1 and the yoke 1 and the contact area between coil 2 and the yoke 2 gradually decrease, and the contact area between the lower part of coil 1 and the yoke 2 gradually increases. Therefore, the magnetic field force received by the mover gradually decreases as the mover rises. When the mover rises to z position 2, the magnetic field force received by the mover is equal to the gravity. If the mover continues to rise, the magnetic field force is less than the gravity, and the mover will return to z position 2. Therefore, when direct current I1 is passed through the coil, the mover finally hovers at z2 positions, corresponding to Figure 7 the midpoint 1. Regardless of the magnitude of the direct current passed through, when the mover is at the position of (h PM +h c1 ) / 2, since the areas of the coil 1 in contact with the yoke 1 and the yoke 2 are equal, and the coil 2 is not in contact with the yoke 2, the magnetic force on the mover is reduced to 0. If the mover hovers at z behind the 2 position and the mover needs to slowly descend or hover during the descent, it is necessary to reduce the direct current passed through the coils 1 and 2, that is, change I1 to I2. At this time, the output situation changes from point 1 to point 2, and the magnetic force on the mover is less than the gravity, and the mover descends to z the 1 position, that is, changes from point 2 to point 3. At this time, the magnetic force on the mover is equal to the gravity, so the mover realizes the movement from z 1 to z the 2 position, and realizes the hovering of the mover at z the 2 position. If the current is gradually reduced to 0, the mover will gradually descend back to the initial position.

[0024] The electric mechanism with controllable vertical position proposed by the present invention can realize the controllable rising, descending and hovering of the mover by simultaneously adjusting the magnitudes of the direct currents passed through the two groups of coils, realize the reset of the mover without a spring under no-load conditions, and the initial position can be adjusted by adjusting a circle of inner rings of the bottom protrusion.

[0025] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claimed rights.

[0026] In addition, it should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A vertical position controllable electric mechanism, comprising a motor housing (1), a coil assembly and a mover assembly (3), characterized in that: The coil assembly and the mover assembly (3) are both arranged in the motor housing (1), and the mover assembly (3) is sleeved in the coil assembly; The coil assembly comprises a first coil (21) and a second coil (22), the first coil (21) and the second coil (22) being arranged in an up-and-down distribution, and the mover assembly (3) comprises a yoke unit and a magnet unit, the yoke unit and the magnet unit being arranged in a stacked state.

2. The vertical position controllable electric mechanism according to claim 1, characterized in that: The shell body of the motor housing (1) is made of magnetic conductive material, and the shell body shape of the motor housing (1) includes but is not limited to a cylindrical structure or a polygonal column structure.

3. The vertical position controllable electric mechanism according to claim 1, characterized in that: The bottom end of the motor housing (1) is integrally connected with an inner convex edge (11), and the bottom end of the mover assembly (3) is supported on the inner convex edge (11).

4. The vertical position controllable electric mechanism according to claim 1, characterized in that: The coil assembly further comprises a coil frame (2), the middle portion of the frame of the coil frame (2) being fixedly connected to the inner wall of the motor housing (1), and the first coil (21) and the second coil (22) are both wound around the coil frame (2).

5. The vertical position controllable electric mechanism according to claim 4, characterized in that: The number of turns of the first coil (21) is greater than the number of turns of the second coil (22).

6. A vertical position controllable electric mechanism according to claim 1 or 5, characterized in that: The yoke unit of the mover assembly (3) comprises a first annular yoke (31) and a second annular yoke (33); the magnet unit of the mover assembly (3) comprises a permanent magnet (32); the first annular yoke (31) and the second annular yoke (33) are respectively connected to the upper and lower ends of the permanent magnet (32).

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