Linear motor and hair trimmer

Abstract

The application discloses a linear motor and a hair clipper, and aims to solve the technical problems of low motor swing rate, small swing range and low production efficiency caused by complicated assembly in the prior art. The linear motor comprises a fixing frame, a stator assembly and a moving assembly, the fixing frame is provided with a track, the moving assembly is freely arranged on the track, and the stator assembly is fixedly arranged on the fixing frame; the stator assembly is provided with a stator winding formed by winding a coil; and the moving assembly comprises at least one permanent magnet. Compared with the prior motor, the application optimizes the use of parts through space and structure design of the parts, realizes high-efficient, stable and continuous linear reciprocating motion, and makes the assembly efficiency higher.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric machines, in particular to a linear motor and a hair trimmer. BACKGROUND

[0002] An electric machine refers to an electromagnetic device that realizes the conversion or transmission of electric energy according to the electromagnetic induction law. Its main function is to generate driving torque, which can be used as a power source for electric appliances or various machines. The current electric machine (such as patent number: CN216490163U, as shown) has the following problems: Figure 1

[0003] The electric machine moves the first support 7' and the second support 6' through the first swing member 10' and the second swing member 11' respectively, causing the first spring 5' and the second spring 4' to deform, realizing the staggered reciprocating motion of the first swing member 10' and the second swing member 11' with the position of the fixed first spring 5' and the second spring 4' as the origin. Since the swing amplitude of the electric machine is limited by the deformation range of the spring, the swing rate is low, the swing amplitude is small, and the swing member is not pure linear motion, i.e. it will be an arc fluctuation, affecting the transmission effect of the force. SUMMARY

[0004] (1) Technical problem to be solved

[0005] In view of the shortcomings of the prior art, the main purpose of the present application is to provide a linear motor and a hair trimmer, which aims to solve the problem of small swing rate and swing amplitude of the electric machine in the prior art, and to realize the true linear motion of the electric machine.

[0006] (2) Technical solution

[0007] In order to solve the above technical problems, the present application provides a linear motor, which comprises a fixed frame, a stator assembly and a moving assembly. The fixed frame is provided with a track, and the moving assembly is freely arranged on the track. The stator assembly is fixedly arranged on the fixed frame, and the stator assembly comprises a stator winding wound by a coil. The moving assembly comprises at least one permanent magnet. When the coil is energized, the stator winding generates a magnetic field, and the stator assembly can drive the moving assembly to move linearly along the O-Y direction on the track by magnetic force.

[0008] Further, the fixed frame comprises an upper fixed frame and a lower fixed frame, which can effectively support the fixed stator assembly and the moving assembly.

[0009] ​Further, the lower fixing frame is provided with four springs, one end of the spring is sleeved on the lower fixing frame, and the other end of the spring is sleeved on one side of the supporting plate, when the motion assembly is linear reciprocating, the spring can reduce the vibration of the motion assembly, can effectively attenuate the vibration and impact of the motion assembly on the motor or the equipment outside the motor, so that the motion assembly has a certain natural frequency, forms a balanced and uniform amplitude, and enhances the service life of the motor.

[0010] Further, the upper end of the upper fixing frame is provided with an oil storage device, the oil storage device comprises an oil storage groove, an oil strip and an oil cover, the oil storage groove is arranged on the upper end surface of the upper fixing frame, the oil strip is arranged in the oil storage groove, the oil strip can be a cotton or a sponge which can absorb lubricating oil, the oil strip can be stored in the oil storage groove for a long time, and the oil strip can be added once and used for a long time, and the oil strip can be replaced regularly, the oil cover is arranged above the oil storage groove, and the oil cover can prevent dust and fix the oil strip in the oil storage groove, the lower end surface of the oil storage groove is provided with a through hole one penetrating upward and downward, and the recess two is provided with a through hole two penetrating upward and downward, during the movement of the motion assembly, the lubricating oil flows down from the through hole one and adheres to the surface of the upper ball, and then flows to the surface of the lower ball through the through hole two, when the motion assembly is high-frequency linear reciprocating on the track, the lubricating oil can adhere to the surface of the upper ball, the surface of the lower ball, the surface of the upper track and the surface of the lower track at the same time, a lubricating film is formed, the lubricating effect is achieved, the direct contact between the surface of the upper ball and the surface of the upper track and the surface of the recess two is reduced, the friction coefficient is reduced, the friction resistance and the power consumption are effectively reduced, and the service life is enhanced.

[0011] (3) Advantageous effects

[0012] Compared with the prior art, the advantageous effects of the present application are as follows:

[0013] 1、When the coil is electrified, the stator assembly drives the motion assembly to linear reciprocate along the track through magnetic force, the motion assembly linear reciprocates, the magnetic force provided by the stator assembly can output power continuously and stably, the motion assembly realizes high-frequency linear reciprocation in a short time, the direction of the magnetic pole of the motion assembly is the same as the direction of reciprocation, and the present application realizes the real linear reciprocation of the motor.

[0014] 2、The upper end of the fixed frame is provided with an oil storage device, the liquid oil melted from the oil strip in the oil storage device adheres to the surface of the upper ball, the surface of the lower ball, the surface of the upper track and the surface of the lower track, a lubricating film is formed, the lubricating effect is achieved, the direct contact between the surface of the upper ball and the surface of the upper track and the surface of the recess two is reduced, the friction coefficient is reduced, the friction resistance and the power consumption are effectively reduced, and the service life is enhanced.

[0015] 3、The motor parts are optimized to reduce the use of complex parts, the fixing and assembly of each part is simple and convenient, the assembly cost is saved, and the production efficiency is effectively improved. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a prior art motor perspective view.

[0017] Figure 2 is a motor perspective view of the present application.

[0018] Figure 3 is a motor exploded view of the present application Figure 1 .

[0019] Figure 4 is a motor exploded view of the present application Figure 2 .

[0020] Figure 5 is a motor exploded view of the present application Figure 3 .

[0021] Figure 6 is a motion assembly perspective view of the present application.

[0022] Figure 7 is a stator assembly working cycle time and current schematic diagram of the present application.

[0023] Figure 8 is a schematic diagram of the motion assembly when the track is stationary.

[0024] Figure 9 is a schematic diagram of the motion assembly moving direction on the track of the present application Figure 1 .

[0025] Figure 10 is a schematic diagram of the motion assembly moving direction on the track of the present application Figure 2 .

[0026] Figure 11 is a schematic diagram of the lubricating oil flow path of the present application.

[0027] Figure 12 is a motor cross-sectional view of the second embodiment of the present application.

[0028] The labels of the components in the drawings are as follows: 4'-second elastic sheet; 5'-first elastic sheet; 6'-second support; 7'-first support; 10'-first swing member; 11'-second swing member; 1-fixed support; 11-lower fixed support; 111-lower track; 112-lower ball; 113-track three; 114-ball; 12-upper fixed support; 121-upper track; 2-stator assembly; 21-left stator assembly; 22-right stator assembly; 211-left stator silicon steel sheet; 212-left stator winding; 221-right stator silicon steel sheet; 222-right stator winding; 213-stator magnetic pole surface a; 223-stator magnetic pole surface b; 23-'T' shaped magnetic conductor; 3-moving assembly; 30-support plate; 31-permanent magnet; 32-magnetic silicon steel sheet; 321-protrusion; 33-groove one; 34-groove two; 341-through hole two; 35-upper ball; 36-groove three; 37-swinging rod; 38-recess; 4-oil storage device; 41-oil storage groove; 411-through hole one; 42-oil strip; 421-lubricating oil; 43-oil cover; 5-spring; 6-elastic damping member; 61-elastic damping sheet one; 62-elastic damping sheet two. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.

[0030] Please refer to Figures 2-11 as shown;

[0031] For the sake of clarity, the term "freely" means that the moving assembly 3 is not fixedly connected with any part. In addition, the term "offset" means that the moving assembly 3 moves forward and backward along the "O-X" direction, moves up and down along the "O-Z" direction, and moves left and right along the "O-Y" direction. In the present application, the moving assembly 3 can only move along the "O-Y" direction due to the limitation of the track. In addition, the directional terms "O-X", "O-Y" and "O-Z" here are for the convenience of distinguishing the positions of the components and the relative directions between the components, which are represented by the coordinate axes in Figure 2 .

[0032] In the first embodiment, as Figures 2-3 shown, Figure 2 is a perspective view of the motor, which comprises a fixed support 1, a stator assembly 2 and a moving assembly 3. The fixed support 1 is provided with a track, and the moving assembly 3 is freely arranged on the track, while the stator assembly 2 is fixedly arranged on the fixed support 1. The stator assembly 2 comprises a stator winding wound by a coil, and the moving assembly 3 comprises at least one permanent magnet 31. When the coil is energized, the stator winding generates a magnetic field, and the stator assembly 2 can drive the moving assembly 3 to move linearly reciprocatingly along the O-Y direction on the track (as Figures 8 to 10 shown) by magnetic force.

[0033] AsFigure 3 As shown, the stator assembly 2 includes a left stator assembly 21 and a right stator assembly 22, the left stator assembly 21 includes a left stator silicon steel sheet 211, and a left stator winding 212 wound by a coil on the left stator silicon steel sheet 211; the right stator assembly 22 includes a right stator silicon steel sheet 221, and a right stator winding 222 wound by a coil on the right stator silicon steel sheet 221; the left stator silicon steel sheet 211 is provided with a stator magnetic pole surface a 213, and the right stator silicon steel sheet 221 is provided with a stator magnetic pole surface b 223.

[0034] As shown in Figure 4 and Figure 5 As shown, the fixed frame 1 includes a lower fixed frame 11 and two upper fixed frames 12, the lower fixed frame 11 is provided with a lower track 111, and at least one lower ball 112 is placed on the lower track 111, and the lower end of the upper fixed frame 12 is provided with an upper track 121.

[0035] As shown in Figure 3 and Figure 6 As shown, the motion assembly 3 includes a support plate 30, a permanent magnet 31, and two magnetic conductive silicon steel sheets 32, the permanent magnet 31 can maintain its unique magnetism for a long time, and the polarity of the permanent magnet 31 does not change, and the two ends of the magnetic conductive silicon steel sheet 32 are partially extended to form a protrusion 321, the support plate 30 is provided with an inner recess 38, the permanent magnet 31 is placed in the inner recess 38, and the two magnetic conductive silicon steel sheets 32 are placed on the two sides of the permanent magnet 31, and the protrusion 321 of the magnetic conductive silicon steel sheet 32 is correspondingly clamped into the inner recess 38, so that the permanent magnet 31 and the magnetic conductive silicon steel sheet 32 can be stably fixed on the support plate 30.

[0036] The lower end of the support plate 30 is provided with a groove one 33 corresponding to the lower ball 112, and the groove one 33 is in the shape of a semicircle matched with the lower ball 112, when the motion assembly 3 moves linearly between the stator magnetic pole surface a 213 and the stator magnetic pole surface b 223 along the O-Y direction, the lower ball 112 can roll between the groove one 33 and the lower track 111, and the upper end of the support plate 30 is provided with a groove two 34 equal in size to the groove one 33 (as shown in Figure 6 The upper end of the support plate 30 is provided with a groove two 34 equal in size to the groove one 33 (as shown in

[0037] The movement component 3 moves by the lower ball 112 rolling between the groove one 33 and the track one 111 and the upper ball 35 rolling between the groove two 34 and the track two 121. As long as the movement component 3 can move, the number of the lower ball 112, the groove one 33, the groove two 34 and the upper ball 35 is at least one and more than one. In this embodiment, the number of the lower ball 112, the groove one 33, the groove two 34 and the upper ball 35 is six. The movement component 3 is indirectly fixed between the lower track 111 and the upper track 121 by the upper ball 35 and the lower ball 112, that is, the movement component 3 is freely arranged on the track to prevent the movement component 3 from deviating.

[0038] Further, the permanent magnet 31, the magnetic silicon steel sheet 32, the stator magnetic pole surface a 213 and the stator magnetic pole surface b 223 are parallel along the O-X direction (as shown in Figure 4 , the space structure is optimized, the magnetic force range that the movement component 3 receives is maximized, and the movement reaches the best effect.

[0039] As shown in Figure 8 , the "T" type magnetic conductor 23 is arranged above the movement component 3. (The "T" type magnetic conductor 23 is not shown in the motor perspective view, which means that there is no such structure, in order to clearly see the internal structure.) When the motor is not powered, the movement component 3 is static between the stator magnetic pole surface a 213 and the stator magnetic pole surface b 223. The magnetic silicon steel sheet 32 on the left of the permanent magnet 31 is S pole, and the magnetic silicon steel sheet 32 on the right of the permanent magnet 31 is N pole.

[0040] There are many ways to power the stator assembly 2, for example, the left stator assembly 21 and the right stator assembly 22 are powered at the same time. At this time, the end of the movement component 3 which does not form a magnetic flux path generates too much heat, and the use effect is not good, which easily affects the service life. For another example, only the left stator assembly 21 is powered (or the right stator assembly 22), and the right stator assembly 22 (or the left stator assembly 21) is not powered. At this time, the movement effect of the movement component 3 driven by the generated magnetic force is not ideal. For another example, the alternating rest power supply mode, the left stator assembly 21 and the right stator assembly 22 are independently controlled to power work (as shown in Figure 7 , the solid line area is the power supply work area, and the dotted line area is the rest period. Taking the movement mode of the movement component 3 moving left and then right along the O-Y direction as an example (as shown in Figure 7 and Figure 9As shown, during the time period t1-t1', both the left stator winding 212 and the right stator winding 222 are energized simultaneously (working period). The stator magnetic pole surface a213 forms an N pole that attracts the motion component 3 to move to the left in the OY direction. At the same time, the stator magnetic pole surface b223 forms an N pole that generates a force that repels the motion component 3 and pushes the motion component 3 to move to the left. During the time period t1'-t2, the left stator winding 212 continues to be energized (working period), while the right stator winding 222 is not energized (rest period).

[0041] like Figure 7 and Figure 10 As shown, during the time period t2-t2', both the left stator winding 212 and the right stator winding 222 are energized simultaneously (operating period). The stator magnetic pole surface b223 forms an S pole to attract the motion component 3 to move to the right in the OY direction, while the stator magnetic pole surface a213 forms an S pole to repel the motion component 3. During the time period t2'-t3, the right stator winding 222 continues to be energized (operating period), while the left stator winding 212 is not energized (rest period). The rest period is optimally 1 / 3 of the operating period. This invention uses an alternating rest energizing method to achieve the linear reciprocating motion of the motion component 3. The rest period can effectively avoid the two stator windings from overheating due to excessive energizing time, which affects their service life, while ensuring that the motion effect of the motion component 3 reaches the optimal state.

[0042] Since the magnetic pole direction of the motion component is the same as the direction of reciprocating motion, and the magnetic pole surfaces a213 and b223 correspond to the magnetic poles S and N of the motion component respectively (face to face), the swing distance of the motion component can be changed by changing the distance between the magnetic pole surfaces a213 and b223, thereby increasing the swing distance of the motion component.

[0043] like Figure 3 and Figure 5 As shown, four springs 5 ​​are provided on the lower fixed frame 11. One end of the spring 5 is sleeved on the lower fixed frame 11, and the other end of the spring 5 is sleeved on one side of the support plate 30. When the motion component 3 is making linear reciprocating motion, the spring 5 can reduce the vibration of the motion component 3 and effectively attenuate the vibration and impact of the motion component 3 on the motor or external equipment. This allows the motion component 3 to have a certain natural frequency, forming a balanced and uniform amplitude, which enhances the service life of the motor. At the same time, the spring 5 plays a supporting role in the linear reciprocating motion of the motion component 3, that is, the resetting role of returning to center. The spring 5 also plays a limiting role in the motion component 3, that is, it ensures that the motion component 3 will not collide with the magnetic pole surface a213 or the magnetic pole surface b223.

[0044] Further, since the motion assembly 3 will spread the vibration to the periphery in the working motion state, the vibration along the O-Y left-right direction is buffered and borne by the spring 5 to weaken, and the motion assembly 3 in the working motion state will also spread the vibration along the O-Z up-down direction, and therefore, the lower fixed frame 11 is provided with an elastic shock-absorbing sheet one 61 with the same size and shape as the lower end face thereof, and four elastic shock-absorbing sheets two 62 are provided between the upper end of the lower fixed frame 11 and the lower end face of the upper fixed frame 12, so as to reduce the vibration and noise through the elastic shock-absorbing sheet one 61 and the elastic shock-absorbing sheet two 62, thereby improving the reciprocating working frequency of the entire motor, preventing the equipment outside the motor from being co-vibrated to cause poor use experience and the like.

[0045] As shown in Figure 4 and Figure 11 , Figure 11 is a schematic diagram of the path of the flow of lubricating oil 421, and since the upper ball 35 and the upper track 121, the recess two 34, and the lower ball 112 and the lower track 111, the recess one 33 all exist between the upper ball 35 and the upper track 121, the recess two 34, and the lower ball 112 and the lower track 111, the recess one 33 during the movement of the motion assembly 3, in order to prevent excessive wear caused by the fast relative sliding, the upper fixed frame 12 is provided with an oil storage device 4 at the upper end thereof, the oil storage device 4 includes an oil storage groove 41, an oil strip 42, and an oil cover 43, the oil storage groove 41 is arranged at the upper end face of the upper fixed frame 12, and the oil strip 42 is placed in the oil storage groove 41, the oil strip 42 can be a cotton or sponge oil-soaked object that can absorb lubricating oil 421, the oil strip 42 can be stored in the oil storage groove 41 for a long time, and once added, it can be used for a long time and can be replaced regularly, the oil cover 43 is placed above the oil storage groove 41 and plays a role of dust prevention and fixing the oil strip 42 in the oil storage groove 41; the oil storage groove 41 is provided with a through hole one 411 penetrating upward and downward, and the recess two 34 is provided with a through hole two 341 penetrating upward and downward, and during the movement of the motion assembly 3, the lubricating oil flows down from the through hole one 411 and adheres to the surface of the upper ball 35, and then flows to the surface of the lower ball 112 through the through hole two 341, so that when the motion assembly 3 moves in a high-frequency straight line on the track, the lubricating oil 421 can be simultaneously adhered to the surface of the upper ball 35, the surface of the lower ball 112, the surface of the upper track 121, and the surface of the lower track 111, forming a lubricating film, playing a lubricating role, reducing the direct contact between the surface of the upper ball 35 and the surface of the upper track 121 and the surface of the recess two 34, thereby reducing the friction coefficient and effectively reducing the friction resistance and power consumption.

[0046] Example two, as shown in Figure 12 , Figure 12is the motor profile of the second embodiment, which is different from the first embodiment in that the groove three 36, the ball 114 and the track three 113 are different in position, specifically, the groove three 36 is arranged on the end surface of the moving assembly 3 relative to the fixed frame 1, and the track three 113 is arranged on the end surface of the fixed frame 1 relative to the moving assembly 3, the diameter of the groove three 36 is the same as that of the track three 113, and the opening direction is opposite, and the ball 114 is arranged between the groove three 36 and the track three 113, and the combination of the groove three 36, the ball 114 and the track three 113 forms cooperation, so that the moving assembly 3 can only do linear reciprocating motion on the track three 113, effectively preventing the position deviation of the moving assembly 3 during movement.

[0047] Further, the swing rod 37 is arranged above the groove three 36, when the coil is energized, the stator assembly 2 drives the swing rod 37 of the moving assembly 3 to do linear reciprocating motion along the track three 113 through magnetic force.

[0048] The third embodiment is different from the first embodiment in that the ball is not used, and the track one 111 and the upper track 121 are replaced with a sliding track (such as a V-shaped groove track), and the position corresponding to the moving assembly 3 of the sliding track is replaced with a track adapted to the sliding track, so as to realize the reciprocating motion of the moving assembly 3 along the track.

[0049] The linear motor of the present application can be applied to a hair trimmer device.

[0050] It is apparent for those skilled in the art that the present application 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 essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0051] In addition, it should be understood that although the present specification is described in terms of embodiments, each embodiment does not contain only one independent technical solution, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be combined to form other embodiments which can be understood by those skilled in the art.

Claims

1. A linear motor, characterized in that: comprising a fixed frame (1), the fixed frame (1) is provided with a track; a stator assembly (2) is provided with a stator winding, and the stator assembly (2) is fixedly arranged on the fixed frame (1); a moving assembly (3) at least comprises a permanent magnet (31); when the stator winding generates an alternating magnetic field, the moving assembly (3) is driven by the magnetic force to move linearly along the track; the moving assembly (3) is freely arranged on the track, and the magnetic pole direction of the moving assembly (3) is the same as the direction of reciprocating motion; the fixed frame (1) comprises a lower fixed frame (11) and an upper fixed frame (12), the upper fixed frame (12) is fixedly provided with the stator assembly (2), and the stator assembly (2) comprises a left stator assembly (21) and a right stator assembly (22); the lower fixed frame (11) is provided with a lower track (111) at the upper end, the upper fixed frame (12) is provided with an upper track (121) at the lower end, the lower track (111) and the upper track (121) are arranged along the O-Y direction, and the moving assembly (3) reciprocates along the lower track (111) and the upper track (121) between the left stator assembly (21) and the right stator assembly (22); the lower end of the moving assembly (3) is provided with a groove one (33), at least one lower ball (112) is slidably connected between the lower track (111) and the groove one (33); the upper end of the moving assembly (3) is provided with a groove two (34), and at least one upper ball (35) is slidably connected between the upper track (121) and the groove two (34); the upper fixed frame (12) is provided with an oil storage device (4), the oil storage device (4) comprises an oil storage groove (41) arranged at the upper end of the upper fixed frame (12), an oil strip (42) arranged in the oil storage groove (41), and an oil cover (43) arranged above the oil storage groove (41); the lower end surface of the oil storage groove (41) is provided with a through hole one (411) penetrating through the upper track (121) in the up-down direction, and the groove two (34) is provided with a through hole two (341) penetrating through the groove one (33) in the up-down direction; the left stator assembly (21) and the right stator assembly (22) are alternately powered off, the left stator assembly (21) and the right stator assembly (22) are provided with an independent control power-on working cycle, the working cycle comprises an off period and a working period, and the off period is 1 / 3 times of the working period. The left stator assembly (21) comprises a left stator silicon steel sheet (211) and a left stator winding (212) wound on the left stator silicon steel sheet (211), the right stator assembly (22) comprises a right stator silicon steel sheet (221) and a right stator winding (222) wound on the right stator silicon steel sheet (221), the lower end of the left stator silicon steel sheet (211) is provided with a stator magnetic pole surface a (213), and the lower end of the right stator silicon steel sheet (221) is provided with a stator magnetic pole surface b (223). ​ ​ ​ ​ ​ ​ ​ ​ 2. A linear motor according to claim 1, characterised in that: ​ 3. A linear motor according to claim 1 or 2, characterised in that: The motion assembly (3) comprises a support plate (30), a permanent magnet (31) is arranged on the support plate (30), at least one side of the left and right sides of the permanent magnet (31) is provided with a magnetic conductive silicon steel sheet (32), the support plate (30) is provided with an inner recess (38), the two ends of the magnetic conductive silicon steel sheet (32) are extended to form a protrusion (321), and the magnetic conductive silicon steel sheet (32) is arranged on the two sides of the permanent magnet (31).

4. A linear motor according to claim 1 or 2, characterised in that: The motion assembly (3) is provided with a groove three (36), the fixed frame (1) is provided with a track three (113), and the groove three (36) and the track three (113) are provided with a ball (114) therebetween.

5. A linear motor according to claim 3, wherein: One end of the motion assembly (3) is provided with a swing rod (37).

6. A linear motor according to claim 1, characterized in that: The oil strip (42) is a cotton strip or a sponge capable of absorbing lubricating oil (421).

7. A linear motor according to claim 4, wherein: The lower fixed frame (11) is provided with a spring (5), one end of the spring (5) is sleeved on the lower fixed frame (11), and the other end of the spring (5) is sleeved on the motion assembly (3).

8. A linear motor according to claim 7, characterised in that: The lower fixed frame (11) is provided with an elastic damping piece (6), the elastic damping piece (6) comprises an elastic damping sheet one (61) with the same size as the lower end surface of the lower fixed frame (11), and the elastic damping piece (6) further comprises an elastic damping sheet two (62) arranged between the upper ends of the two upper fixed frames (12) and the lower ends of the two upper fixed frames (12).

9. A hair trimmer characterized by: Use the linear motor of any one of claims 1-8.

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