Moving magnet type double-side linear oscillation motor without mechanical spring

Abstract

The invention relates to a moving-magnet type mechanical-spring-free bilateral linear oscillation motor, which belongs to the field of linear oscillation motors and comprises a stator core, armature windings, rotor permanent magnets, a rotor support and linear guide rails. The three rotor permanent magnets are rotor stressed parts, the rotor permanent magnets and the rotor support form a rotor, the two C-shaped stator iron cores are parallelly and symmetrically arranged on the two sides of a rotor motion plane, the two armature windings are wound along respective stator iron core yokes respectively, and the current directions of the two windings are symmetrical and the same about the rotor motion plane; when sine alternating current is introduced into the armature winding, the rotor is subjected to reciprocating driving force, positioning force between the rotor permanent magnet and the stator iron core forms a magnetic equivalent spring, and when the frequency of the reciprocating driving force borne by the rotor is the same as the inherent frequency of the magnetic equivalent spring, the motor realizes resonance operation without a mechanical spring and has the highest efficiency and the lowest noise. According to the invention, mechanical-spring-free resonance operation of the linear oscillation motor is realized, and the linear oscillation motor has the characteristic of small size.

Description

Technical Field

[0001] The present invention belongs to the field of linear oscillation motors, and more specifically, relates to a moving magnet type bilateral linear oscillation motor without mechanical springs. Background Art

[0002] The refrigeration compressor using the traditional rotary motor + crank-connecting rod mechanism has the disadvantages of many system friction points, low efficiency and large size due to the existence of the intermediate conversion mechanism. The refrigeration compressor using the linear oscillation motor can not only save the intermediate crank-connecting rod and other conversion structures, but also reduce the friction points, improve efficiency and reduce the size of the compressor system.

[0003] Traditional linear oscillation motors rely on the restoring force of mechanical cylindrical springs and electromagnetic driving force to achieve forced simple harmonic vibration of electromechanical systems, but the use of mechanical cylindrical springs significantly weakens the small size advantage of linear oscillation motors. Therefore, domestic and foreign scholars introduced mechanical plate springs into linear oscillation motors to improve the disadvantage of large cylindrical springs. However, due to the small size of the system and the small size of the installed plate springs, the maximum deformation of the plate springs generally does not exceed 6mm, thus limiting the maximum stroke of the piston of the linear oscillation motor.

[0004] Due to the many problems faced by existing linear oscillation motors using mechanical springs, domestic and foreign countries have begun to develop linear oscillation motors without mechanical springs in recent years. The principle is still to use the restoring force and electromagnetic driving force to form forced simple harmonic vibration. Unlike linear oscillation motors with mechanical springs, the restoring force of linear oscillation motors without mechanical springs is provided by the inherent attraction between the stator and the mover, that is, the positioning force, which can improve the problems of large volume, limited stroke, and high mechanical noise that exist in the use of mechanical springs.

[0005] However, the existing linear oscillation motor still has the disadvantage that the positioning force does not increase proportionally with the position of the mover, which leads to the situation that the linear oscillation motor has multiple resonance points in one reciprocating motion cycle. The existence of multiple resonance points in one motion cycle will make it impossible to quickly track the time-varying resonance frequency when using resonance frequency tracking control to achieve optimal efficiency control, so that the system cannot always run to the optimal efficiency point.

[0006] In summary, there is an urgent need to research a mechanical spring-free linear oscillation motor whose positioning force is highly proportional to the position of the mover and which is easy to process and mass produce. Summary of the invention

[0007] In view of the defects of the prior art and the need for improvement, the present invention provides a moving magnet type bilateral linear oscillation motor without mechanical springs, which aims to solve the problems of large size and short life of the existing linear oscillation motors using mechanical springs, and low system operating efficiency caused by the unclear proportional relationship between the positioning force equivalent magnetic spring and the position of the mover of the existing linear oscillation motors without mechanical springs.

[0008] To achieve the above objectives, according to one aspect of the present invention, a moving magnet type mechanical spring-free bilateral linear oscillation motor is provided, comprising: a stator core, an armature winding, a mover permanent magnet, a mover bracket, and a linear guide.

[0009] Furthermore, the three mover permanent magnets are force-bearing components of the mover, and the mover permanent magnets and the mover bracket constitute the mover.

[0010] Furthermore, the two C-shaped stator cores are arranged in parallel and symmetrically on both sides of the rotor motion plane, the two armature windings are respectively wound along the yoke of their respective stator cores, and the current directions of the two windings are symmetrical and the same about the rotor motion plane.

[0011] Furthermore, when sinusoidal alternating current is supplied to the armature winding, the mover will be subjected to a reciprocating driving force.

[0012] Furthermore, the positioning force between the mover permanent magnet and the stator core constitutes a magnetic equivalent spring.

[0013] Furthermore, the natural resonant frequency of the magnetic equivalent spring satisfies: ; Among them, k e is the equivalent elastic coefficient of the magnetic equivalent spring, satisfying k e =F dm / x m , F dm is the peak positioning force, x m is the unilateral stroke of the mover, and m is the total mass of the motor mover.

[0014] Furthermore, when the frequency of the reciprocating driving force on the mover is the same as the natural frequency of the magnetic equivalent spring, the motor realizes resonant operation without a mechanical spring, and at this time the system has the highest efficiency and the lowest noise.

[0015] Furthermore, the three mover permanent magnets are magnetized alternately and in opposite directions in sequence and are arranged in parallel.

[0016] Furthermore, the two armature windings are both in the form of concentrated windings.

[0017] Furthermore, the mover bracket is in an I-shape, and shafts connected to the bracket extend from both sides.

[0018] Furthermore, the shaft of the mover bracket is provided with threads, which can be connected to a load or connected in series with a multi-stage moving magnet type mechanical spring-free linear oscillation motor through a nut.

[0019] Furthermore, guide grooves are provided on both sides of the I-shaped mover bracket for placing and fixing the mover permanent magnet.

[0020] Furthermore, the mover, which is composed of the mover permanent magnet and the mover bracket, is supported by a linear guide rail. When the motor is working, the mover performs linear reciprocating motion along the linear guide rail.

[0021] Furthermore, the stator core is obtained by laminating the minimum laminating units in the transverse direction.

[0022] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects: (1) The permanent magnetic field generated by the permanent magnet of the mover of the present invention can not only work together with the armature magnetic field generated by the armature winding to generate electromagnetic thrust, but also interact with the stator core to generate a large restoring force. The restoring force is essentially a positioning force that increases in direct proportion to the position of the mover, so that the positioning force can constitute a magnetic equivalent spring, thereby replacing the mechanical spring in the traditional linear oscillation motor. The equivalent magnetic spring formed by the positioning force makes the motor smaller, more compact, and less noisy and costly.

[0023] (2) The motor of the present invention is a flat plate structure, wherein the stator core is made of silicon steel sheets stacked in the transverse direction, thereby having a higher stacking coefficient, thereby being able to solve the problems of low magnetic permeability and reduced motor efficiency when using SMC materials.

[0024] (3) The present invention adopts a moving magnet motor structure, so that the motor can obtain a higher output thrust.

[0025] (4) Simulation analysis and prototype experiments have proved that the dynamic magnet type mechanical spring-free bilateral linear oscillation motor (including its mover support method, etc.) proposed in the present invention has a high permanent magnet utilization rate and a low stator core saturation degree. It can form a magnetic spring for the mover permanent magnet and can replace the mechanical spring in the traditional linear oscillation motor. It has a simpler and more compact structure, is easy to assemble, has a high degree of integration, and is small in size. It is suitable for applications such as compression or pumps with bidirectional reciprocating linear motion. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A three-dimensional cross-sectional schematic diagram of a moving magnet type double-sided linear oscillation motor without mechanical springs provided in an embodiment of the present invention; Figure 2 A three-dimensional schematic diagram of a mover support and a linear guide rail of a moving magnet type double-sided linear oscillation motor without mechanical springs provided in an embodiment of the present invention; Figure 3 A three-dimensional schematic diagram of the minimum stacking unit and stacking method of the stator core of a moving magnet type mechanical spring-free double-sided linear oscillation motor provided in an embodiment of the present invention; Figure 4 A schematic diagram of a moving magnet type mechanical spring-free bilateral linear oscillation motor with a mover in a balanced position provided by an embodiment of the present invention; Figure 5 A schematic diagram of the direction of the positioning force when the mover of a moving magnet type double-sided linear oscillation motor without mechanical springs provided by an embodiment of the present invention is at the right side of the equilibrium position; Figure 6 A schematic diagram of the direction of the positioning force when the mover of a moving magnet type double-sided linear oscillation motor without mechanical springs provided by an embodiment of the present invention is on the left side of the equilibrium position; Figure 7 A diagram showing the relationship between the equivalent magnetic spring and the position of the mover of a moving magnetic double-sided linear oscillation motor with no mechanical spring and the positioning force provided in an embodiment of the present invention.

[0027] In all drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1 is the stator core; 2 is the armature winding; 3 is the mover permanent magnet; 4 is the mover bracket; 5 is the shaft; 6 is the linear guide. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] Example A moving magnet type double-sided linear oscillating motor without mechanical springs, such as Figure 1 As shown, it includes: a stator core 1, an armature winding 2, a mover permanent magnet 3, a mover bracket 4, and a linear guide 6. The three mover permanent magnets 3 are the force-bearing components of the mover, and the three mover permanent magnets 3 are magnetized in reverse order alternately and arranged in parallel. The mover permanent magnets 3 and the mover bracket 4 constitute a mover, and two C-shaped stator cores 1 are arranged in parallel and symmetrically on both sides of the mover motion plane. The two armature windings 2 are respectively wound along the yoke of their respective stator cores 1, and both adopt the concentrated winding form, and the current directions of the two armature windings 2 are symmetrical and the same about the mover motion plane.

[0030] When sinusoidal alternating current is passed through the armature winding 2, the stator teeth generate periodically alternating magnetic poles, so that the mover is subjected to a reciprocating driving force. The positioning force between the mover permanent magnet 3 and the stator core 1 constitutes a magnetic equivalent spring, and the inherent resonant frequency of the magnetic equivalent spring satisfies: ; Among them, k e is the equivalent elastic coefficient of the magnetic equivalent spring, satisfying k e =F dm / x m , F dm is the peak positioning force, x m is the unilateral stroke of the mover, and m is the total mass of the motor mover.

[0031] When the frequency of the reciprocating driving force on the mover is the same as the natural frequency of the magnetic equivalent spring, the motor achieves resonant operation without a mechanical spring. At this time, the system has the highest efficiency and the lowest noise.

[0032] like Figure 2 The figure shows a schematic diagram of a mover bracket and a linear guide rail. The mover bracket 4 is in an I-shape, and shafts 5 connected to the mover bracket 4 extend from both sides. The shafts 5 are threaded and can be connected to a load or connected in series with a multi-stage moving magnet type mechanical spring-free linear oscillation motor through a nut. Guide grooves are provided on both sides of the inside of the mover bracket 4 for placing and fixing the mover permanent magnet 3. Both sides of the outside of the mover bracket 4 are slidably connected to the linear guide rails 6, which support the entire mover. When the motor is working, the mover performs linear reciprocating motion along the linear guide rails 6.

[0033] like Figure 3 As shown, the stator core 1 is obtained by laminating the minimum lamination units in the transverse direction, and the minimum lamination units are all made of non-oriented silicon steel sheets.

[0034] like Figure 4 , Figure 5 , Figure 6 As shown, in the embodiment of the present invention, when the displacement of the mover is 0, that is, in the equilibrium position, the positioning force it receives is 0; when the mover moves to the right side of the equilibrium position, the direction of the positioning force it receives is to the left, and as the displacement increases, the positioning force also increases linearly; when the mover moves to the left side of the equilibrium position, the direction of the positioning force it receives is to the right, and as the displacement increases, the positioning force also increases linearly. Figure 7 Description shown Figure 4 , Figure 5 , Figure 6 The specific functional relationship diagram of the positioning force and the position of the mover when the mover is in different positions. The two are in direct proportion, which can play the role of Hooke's law F in the equivalent mechanical spring. d =-k e The function of x.

[0035] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A moving magnet type double-sided linear oscillation motor without mechanical spring, characterized in that: include: Stator core, armature winding, mover permanent magnet, mover bracket; wherein, the mover permanent magnet is the force-bearing component of the mover, the mover permanent magnet and the mover bracket constitute the mover, two C-shaped stator cores are parallel and symmetrically arranged on both sides of the mover motion plane, two armature windings are respectively wound along the yoke of their respective stator cores, and the current directions of the two windings are symmetrical and the same about the mover motion plane; When the armature winding is supplied with sinusoidal alternating current, the mover will be subjected to a reciprocating driving force, and the positioning force between the permanent magnet of the mover and the stator core constitutes a magnetic equivalent spring, the inherent resonant frequency of which satisfies: ； Among them, k e is the equivalent elastic coefficient of the magnetic equivalent spring, satisfying k e =F dm / x m , F dm is the peak positioning force, x m is the unilateral stroke of the mover, and m is the total mass of the motor mover; When the frequency of the reciprocating driving force on the mover is the same as the natural frequency of the magnetic equivalent spring, the motor achieves resonant operation without a mechanical spring.

2. The moving magnet type double-sided linear oscillation motor without mechanical spring according to claim 1, characterized in that: The number of mover permanent magnets selected is three or more, and the mover permanent magnets are magnetized in reverse order alternately and arranged in parallel.

3. The moving magnet type double-sided linear oscillation motor without mechanical spring according to claim 1, characterized in that: The two armature windings are both in the form of concentrated windings.

4. The moving magnet type double-sided linear oscillation motor without mechanical spring according to claim 1, characterized in that: The mover bracket is in an I-shape, and shafts connected to the bracket extend from both sides. The shafts are threaded and used to connect loads or to connect multi-stage moving magnet type mechanical spring-free linear oscillation motors in series through nuts.

5. The moving magnet type double-sided linear oscillation motor without mechanical spring according to claim 4, characterized in that: Guide grooves are provided on both sides of the I-shaped mover bracket for placing and fixing the mover permanent magnet.

6. A moving magnet type double-sided linear oscillation motor without mechanical spring according to claim 1 or 3, characterized in that: It also includes a linear guide rail, the mover is supported by the linear guide rail, and when the motor is working, the mover performs linear reciprocating motion along the linear guide rail.

7. The moving magnet type double-sided linear oscillation motor without mechanical spring according to claim 1, characterized in that: The stator core is obtained by stacking the minimum stacking units in the transverse direction.

8. The moving magnet type double-sided linear oscillation motor without mechanical spring according to claim 7, characterized in that: The minimum stacking units are all made of non-oriented silicon steel sheets.

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