High frequency electromagnetic swing motor

Abstract

The invention discloses a high-frequency electromagnetic swing motor, which comprises an electromagnetic coil module and a swing arm assembly, wherein the electromagnetic coil module comprises a C-shaped iron core and a first coil and a second coil, and the two ends of the C-shaped iron core respectively have a first tongue end face and a second tongue end face in a circular arc shape; the swing arm assembly comprises a swing arm, a magnetic collecting seat and a first group of magnets and a second group of magnets respectively adapted to the first tongue end face and the second tongue end face; the first group of magnets comprises a first magnet and a second magnet, and the magnetic poles on the outer side faces of the first magnet and the second magnet are of different names, and the magnetic gap between the outer side face of the first magnet and the first tongue end face and the magnetic gap between the outer side face of the second magnet and the second tongue end face are equal; the second group of magnets comprises a third magnet and a fourth magnet, and the magnetic poles on the outer side faces of the third magnet and the fourth magnet are of different names, and the third magnet is located beside the second magnet, and the magnetic poles on the outer side faces of the third magnet and the second magnet have the same name; the magnetic gap between the outer side face of the third magnet and the second tongue end face and the magnetic gap between the outer side face of the fourth magnet and the second tongue end face are equal.

Description

Technical Field

[0001] The invention relates to the technical field of electric hair clippers, in particular to a high-frequency electromagnetic swing motor. Background Art

[0002] Traditional magnetic pendulum electric hair clippers can be divided into two types: simple pendulum and balanced pendulum according to the magnetic pendulum principle. The difference between the simple pendulum and the balanced pendulum lies in the difference in the direction of the electromagnetic force acting on the blade in one drive signal cycle. The difference between the simple pendulum and the balanced pendulum is defined as follows: The simple pendulum drive refers to the electromagnetic force acting on the blade group twice in one drive signal cycle, with the same direction. The balanced pendulum drive refers to the electromagnetic force acting on the blade group twice in one drive signal cycle, with opposite directions. The above-mentioned electromagnetic force drive signal is an alternating signal, not a DC signal. The polarity of the alternating signal flips within one cycle, and the positive and negative polarities alternate. The alternating signal can be a square wave, a sine wave, or a waveform modulated by PWM.

[0003] At present, the life requirement of professional electric hair clippers is 1,000 hours of cumulative working time. Ordinary DC brush motors have certain technical difficulties in achieving long life due to brush wear. Traditional brushless motors can achieve long life requirements because there is no brush wear, but the cost is higher.

[0004] The design cost of the magnetic pendulum drive is lower, and the balanced pendulum method is more common in designs that can meet professional life requirements. However, the obvious disadvantage of the traditional balanced pendulum method is the low pendulum frequency, which results in low cutting efficiency of the electric hair clipper.

[0005] Specifically, Figure 1 The typical structural design of the magnetic swing motor drive in the single swing mode is shown. The characteristic of this design is that the whole design has no magnets, and is mainly composed of a reset spring 301, a pair of E iron cores 302 and a C-type iron core 303. The number of coils 304 is also only one. The swing arm 305 is rigidly connected to the C-type iron core and the knife group 306, and vibrates under the electromagnetic force generated by the E iron core. At present, this type of design is usually directly supplied with 80~240V AC mains, because this design works on the blade twice in one drive signal cycle, and in the same direction. Each work depends on the reset spring to reset. Therefore, the result is that the knife group can swing twice in one drive signal cycle. The frequency of the swing depends on the power frequency of the mains (50 / 60Hz), and the output frequency is a multiple of the power frequency, which is equivalent to 6000~7200 times / minute. The advantages of the single-pendulum design are simple structure and the highest blade swing frequency among similar products. The disadvantages are that due to the unbalanced working method, the hand-held vibration is strong, and the swing arm is prone to fatigue fracture under high-frequency swing, which affects the service life. It is difficult to meet the requirement of 1,000 hours of cumulative service life in the professional electric hair cutting field. The general conventional life is about 100 to 200 hours.

[0006] Figure 2 The typical structural design of the swing motor of the balancing pendulum is shown. The main feature of the design is that the swing arm 401 has a rotating shaft, and the swing arm 401 swings back and forth around the rotating shaft 402 under the electromagnetic force. Generally, two reset springs 403 are provided to enable rapid centering reset when the electromagnetic force disappears. The magnet 404 is installed in the middle of the swing arm, and the north and south pole directions of the magnet are consistent with the movement direction of the knife group 406. The north and south poles of the magnet are respectively installed with L-shaped iron cores 407 for magnetic polarization to improve the coupling efficiency of the magnetic lines of force generated by the electromagnetic coil. The coil core 409 that generates the electromagnetic force is E-shaped, and the number of coils 408 is also 1. Because the electromagnetic forces acting on the swing arm in one drive signal cycle are opposite to each other, the experience of holding it by hand is better than that of the single pendulum design, with lower vibration and smooth and quiet operation. The disadvantage is that in one signal cycle, the blade group only completes one swing, which is synchronized with the mains 50 / 60Hz. The swing frequency range is 3000~3600 times / minute, which is twice as efficient as the 6000~7200 times / minute of a single pendulum, resulting in a shearing efficiency 50% lower than that of a single pendulum. The life of the balanced pendulum is often due to damage to the two reset springs that are repeatedly compressed and released at high frequencies. It usually fails due to fatigue fracture, but its life is generally higher than that of a single pendulum. Therefore, the design of the balanced pendulum is often seen in the application field of 1000-hour professional electric hair clippers.

[0007] In view of this, the inventor proposes the following technical solution. Summary of the invention

[0008] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a high-frequency electromagnetic swing motor.

[0009] In order to solve the above technical problems, the present invention adopts the following technical solutions: the high-frequency electromagnetic swing motor includes an electromagnetic coil module and a swing arm assembly matched with the electromagnetic coil module, the electromagnetic coil module includes a C-shaped iron core, a first coil and a second coil sleeved on both sides of the C-shaped iron core and electrically connected, and the two ends of the C-shaped iron core respectively have a first tongue end face and a second tongue end face in the shape of an arc; the swing arm assembly includes a swing arm and a magnetic collecting seat fixed to the rear end of the swing arm, and a first group of magnets and a second group of magnets arranged on the outer side of the magnetic collecting seat and respectively adapted to the first and second tongue end faces; wherein the first group of magnets includes a first magnet and a second magnet that are distributed at intervals and the outer side faces are both set as arc surfaces, and the magnetic poles of the outer side faces of the first magnet and the second magnet are different names, and the magnetic gap between the outer side face of the first magnet and the first tongue end face is equal to the magnetic gap between the outer side face of the second magnet and the second tongue end face; the second group of magnets includes a third magnet and a fourth magnet that are distributed at intervals and the outer side faces are both set as arc surfaces, and the third magnet and the fourth magnet The magnetic poles on the outer side of the magnet are of different names, and the third magnet is located next to the second magnet, and the magnetic poles on the outer side of the third magnet and the second magnet have the same name; the magnetic gap between the outer side of the third magnet and the second tongue end face is equal to the magnetic gap between the outer side of the fourth magnet and the second tongue end face; after the alternating current is input into the first coil and the second coil, the magnetic collecting seat and the C-shaped iron core form a closed magnetic circuit, and the magnetic poles formed by the first tongue end face and the second tongue end face are of different names, and after the positive and negative half cycles of an electromagnetic drive signal cycle are changed, the first The magnetic poles of the first tongue end face and the second tongue end face are interchanged to cooperate with the first group of magnets and the second group of magnets to drive the swing arm to swing back and forth at least once; when the phase of the alternating current is at zero point and the input current is zero or tends to zero, the electromagnetic force of the C-shaped iron core is weakened or zero, the first and second magnets are adsorbed to the first tongue end face through their inherent permanent magnetic force, and the third and fourth magnets are adsorbed to the second tongue end face through their own inherent permanent magnetic force, so that the swing arm is driven by the permanent magnetic force of the magnet to quickly achieve centering reset, thereby replacing the reset spring to achieve the reset function.

[0010] Furthermore, in the above technical solution, assuming that the positive half cycle of the alternating current is input, according to Lenz's law, the magnetic pole generated by the first tongue end face of the C-shaped iron core after the magnetic line of force is polarized is S, and the magnetic pole generated by the second tongue end face is N; the magnetic pole on the outer side of the first magnet is N, and the magnetic pole on the outer side of the second magnet is S; the magnetic pole on the outer side of the third magnet is S, and the magnetic pole on the outer side of the fourth magnet is N. According to the principle that magnetic poles of the same name repel each other and poles of opposite names attract each other, under the action of electromagnetic force, the first tongue end face generates an adsorption force on the first magnet and a repulsive force on the second magnet. At the same time, the second tongue end face generates an adsorption force on the third magnet and a repulsive force on the fourth magnet. Finally, the electromagnetic force vectors generated by the first tongue end face and the second tongue end face act on the swing arm to push the swing arm to twist counterclockwise. When the positive half cycle of the alternating current is completed and alternately transitions to the negative half cycle, the electric current The current will have a zero point, at which time the electromagnetic force of the C-type iron core disappears, the first and second magnets generate an adsorption force on the first tongue end face through their inherent permanent magnetic force, and the third and fourth magnets generate an adsorption force on the second tongue end face through their own inherent permanent magnetic force, and the swing arm quickly tends to be balanced in the center under the action of the adsorption force; when the transition to the negative half cycle of the alternating current, according to Lenz's law, the magnetic pole generated by the first tongue end face of the C-type iron core after the magnetic line of force is polarized is N, and the magnetic pole generated by the second tongue end face is S; according to the principle that magnetic poles of the same name repel each other and poles of different names attract each other, under the action of the electromagnetic force, the first tongue end face generates a repulsive force on the first magnet and an adsorption force on the second magnet. At the same time, the second tongue end face generates a repulsive force on the third magnet and an adsorption force on the fourth magnet. Finally, the electromagnetic force vectors generated by the first tongue end face and the second tongue end face act on the swing arm to push the swing arm to twist clockwise.

[0011] Furthermore, in the above technical solution, the strength of the permanent magnetic force of the first magnet, the second magnet, the third magnet and the fourth magnet determines the elastic modulus similar to that of a compression spring, and the magnetic force strength is proportional to the elastic modulus, that is, the magnetic force of the magnet can determine the resonant frequency of the swing motor, and the magnetic gap is inversely proportional to the inherent resonant frequency of the swing motor, and the permanent magnetic force inherent in the magnet is proportional to the inherent resonant frequency of the swing motor; based on the principle of simple harmonic model, if the frequency of the alternating current is consistent with the inherent resonant frequency of the swing motor, a sharp increase in the swing amplitude will result, thereby entering an efficient resonant output, that is, the operating frequency of the swing motor can be adjusted by adjusting the permanent magnetic force strength of the magnet and a reasonable magnetic gap.

[0012] Furthermore, in the above technical solution, the outer side surfaces of the first tongue end face and the second tongue end face are both arc surfaces, and are on the same circumference and concentric with the rotation center of the swing arm; the arc surfaces of the first magnet, the second magnet, the third magnet and the fourth magnet are on the same circumference and concentric with the rotation center of the swing arm.

[0013] Furthermore, in the above technical solution, the magnetic collecting seat is composed of multiple pieces of magnetic material sheets stacked and fixed together, the outer side surface of the magnetic collecting seat is arc-shaped, and the outer side surface of the magnetic collecting seat is provided with four arc-shaped grooves distributed at intervals, the first magnet, the second magnet, the third magnet and the fourth magnet are installed in the four arc-shaped grooves in sequence, and the outer sides of the first magnet, the second magnet, the third magnet and the fourth magnet all protrude outside the arc-shaped grooves.

[0014] Furthermore, in the above technical solution, the swing arm is formed by injection molding of siacon material or nylon material, and the swing arm and the magnetic collecting seat are integrated by in-mold injection molding; the first coil and the second coil are connected in parallel, or the first coil and the second coil are connected in series.

[0015] Furthermore, in the above technical solution, a connecting portion is formed on the other side of the magnetic collecting seat relative to where the first magnet, the second magnet, the third magnet and the fourth magnet are installed, and a plurality of fixing grooves are arranged on the outside of the connecting portion. The swing arm wraps around the connecting portion, and the swing arm is partially integrated into the fixing groove.

[0016] Furthermore, in the above technical solution, the electromagnetic coil module also includes a frame and an upper fixing plate and a lower fixing plate made of metal electrolytic iron; the C-shaped iron core is inserted into the frame, and the first coil and the second coil are respectively wound around the outer periphery of both sides of the frame and are sleeved on both sides of the C-shaped iron core; the upper fixing plate and the lower fixing plate are respectively fixed to the upper end face and the lower end face of the frame by screws, and the upper fixing plate and the lower fixing plate also cover the first coil and the second coil.

[0017] Furthermore, in the above technical solution, a bearing is provided in the middle part of the swing arm, and a central rotating shaft is passed through the bearing. The upper and lower ends of the central rotating shaft are respectively passed through the upper shaft hole of the upper fixed plate and the lower shaft hole of the lower fixed plate, and an upper washer is provided between the upper end of the swing arm and the upper fixed plate; a lower washer is provided between the lower end of the swing arm and the lower fixed plate; a driving shaft is provided at the other end of the swing arm opposite to the magnetic collecting seat, and the driving shaft is connected to the knife group.

[0018] Furthermore, in the above technical solution, the high-frequency electromagnetic swing motor also includes a DC to AC conversion module, which converts the input DC current into an alternating current and then outputs the alternating current to the first coil and the second coil, and the operating frequency of the alternating current is set to any value between 60-200 Hz.

[0019] After adopting the above technical scheme, the present invention has the following beneficial effects compared with the prior art: the present invention drives the swing arm to quickly realize centering reset through the permanent magnetic force of the magnet, so as to replace the reset spring to realize the reset function. Since there is no reset spring or brush that is prone to fatigue failure or easy to wear, it has basic excellence in long-life design requirements and meets the requirements of long life, high shear efficiency and low cost. In addition, the present invention belongs to the balanced pendulum method, with low vibration when held in hand, ensuring the comfort of users, which makes the present invention extremely competitive in the market. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of a magnetic pendulum motor in a single pendulum mode in the prior art;

[0021] Figure 2 It is a structural diagram of a oscillating motor of a balancing pendulum in the prior art;

[0022] Figure 3 is a stereogram of the present invention;

[0023] Figure 4 is a three-dimensional diagram of the electric hair clipper made by the present invention;

[0024] Figure 5 is a three-dimensional exploded view of the present invention;

[0025] Figure 6 is a three-dimensional diagram of the swing arm assembly of the present invention;

[0026] Figure 7 is a parallel connection diagram of the first coil and the second coil in the present invention;

[0027] Figure 8 is a series connection diagram of the first coil and the second coil in the present invention;

[0028] Fig. 9 is the wiring diagram of the present invention;

[0029] Fig.10 This is a first assembly diagram of the magnetic collecting base, the first group of magnets and the second group of magnets in the present invention;

[0030] Fig.11 This is a second assembly diagram of the magnetic collecting base, the first group of magnets and the second group of magnets in the present invention;

[0031] Fig.12 It is a working principle diagram of the present invention. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with specific embodiments and drawings.

[0033] See Figure 3-12As shown, a high-frequency electromagnetic swing motor is used to be installed in the housing of an electric hair clipper and to drive the blade assembly in the electric hair clipper to work so as to achieve a shearing action.

[0034] The high-frequency electromagnetic swing motor of the present invention comprises an electromagnetic coil module 1 and a swing arm assembly 2 matched with the electromagnetic coil module 1. The swing arm assembly 2 is connected to a knife assembly 20 and drives the knife assembly 20 to work.

[0035] The electromagnetic coil module 1 at least includes a C-shaped iron core 11, a first coil 12 and a second coil 13 which are sleeved on both sides of the C-shaped iron core 11 and electrically connected, and the two ends of the C-shaped iron core 11 respectively have a first tongue end face 111 and a second tongue end face 112 in the shape of an arc; the swing arm assembly 2 includes a swing arm 21 and a magnetic collecting seat 22 fixed to the rear end of the swing arm 21, and a first group of magnets 23 and a second group of magnets 24 which are arranged on the outer side surface of the magnetic collecting seat 22 and respectively adapted to the first and second tongue end faces 111 and 112; wherein the first tongue end face 111 corresponds to the first group of magnets 23 to form a group of magnetic pairs; the second tongue end face 112 corresponds to the second group of magnets 24 to form another group of magnetic pairs.

[0036] Among them, the first group of magnets 23 includes a first magnet 231 and a second magnet 232, which are distributed at intervals and whose outer side surfaces are both set as arc surfaces, and the magnetic poles of the outer side surfaces of the first magnet 231 and the second magnet 232 are of different names, and the magnetic gap between the outer side surface of the first magnet 231 and the first tongue end surface 111 is equal to the magnetic gap between the outer side surface of the second magnet 232 and the second tongue end surface 112; the second group of magnets 24 includes a third magnet 241 and a fourth magnet 242, which are distributed at intervals and whose outer side surfaces are both set as arc surfaces, and the magnetic poles of the outer side surfaces of the third magnet 241 and the fourth magnet 242 are of different names, and the third magnet 241 is located beside the second magnet 232, and the magnetic poles of the outer side surfaces of the third magnet 241 and the second magnet 232 are of the same name; the magnetic gap between the outer side surface of the third magnet 241 and the second tongue end surface 112 is equal to the magnetic gap between the outer side surface of the fourth magnet 242 and the second tongue end surface 112; After the variable current is input into the first coil 12 and the second coil 13, the magnetic collecting seat 22 and the C-shaped iron core form a closed magnetic circuit, and the magnetic poles formed by the first tongue end face 111 and the second tongue end face 112 are of different names, and after the positive and negative half-cycles of an electromagnetic drive signal cycle are changed, the magnetic poles of the first tongue end face 111 and the second tongue end face 112 are interchanged to cooperate with the first group of magnets 23 and the second group of magnets 24 to drive the swing arm 21 to swing back and forth at least once; when the alternating current phase is at zero point and the input current is zero or tends to zero, the electromagnetic force of the C-shaped iron core 11 is weakened or zero, and the first and second magnets 231 and 232 are adsorbed to the first tongue end face 111 through their inherent permanent magnetic force, and the third and fourth magnets 241 and 242 are adsorbed to the second tongue end face 112 through their own inherent permanent magnetic force, so that the swing arm 21 is driven by the permanent magnetic force of the magnet to quickly achieve centering reset, so as to replace the reset spring to achieve the reset function.

[0037] The present invention uses the permanent magnetic force of the magnet to drive the swing arm 21 to quickly achieve centering reset, thereby replacing the reset spring to achieve the reset function. Since there is no reset spring or brush that is prone to fatigue failure or wear, it has basic excellence in long-life design requirements and meets the requirements of long life, high shear efficiency and low cost. In addition, the present invention belongs to the balanced pendulum method, has low vibration when held in hand, and ensures user comfort, which makes the present invention extremely competitive in the market.

[0038] The working principle of the present invention is as follows: assuming that the positive half cycle of the input alternating current is used, according to Lenz's law, the magnetic pole generated by the first tongue end face 111 of the C-shaped iron core 11 after the magnetic line of force is polarized is S, and the magnetic pole generated by the second tongue end face 112 is N; the magnetic pole on the outer side of the first magnet 231 is N, and the magnetic pole on the outer side of the second magnet 232 is S; the magnetic pole on the outer side of the third magnet 241 is S, and the magnetic pole on the outer side of the fourth magnet 242 is N. According to the principle that magnetic poles of the same name repel each other and poles of different names attract each other, under the action of electromagnetic force, the first tongue end face 111 generates an adsorption force on the first magnet 231 and a repulsive force on the second magnet 232. At the same time, the second tongue end face 112 generates an adsorption force on the third magnet 241 and a repulsive force on the fourth magnet 242. Finally, the electromagnetic force vectors generated by the first tongue end face 111 and the second tongue end face 112 act on the swing arm 21 to push the swing arm 21 to twist counterclockwise.

[0039] When the positive half cycle of the alternating current is completed and alternately transitions to the negative half cycle, the current will reach a zero point. At this time, the electromagnetic force of the C-shaped iron core 11 disappears, and the first and second magnets 231 and 232 generate adsorption force on the first tongue end face 111 through their inherent permanent magnetic force, and the third and fourth magnets 241 and 242 generate adsorption force on the second tongue end face 112 through their own inherent permanent magnetic force. Under the action of the adsorption force, the swing arm 21 quickly tends to be centered and balanced.

[0040] When transitioning to the negative half cycle of the alternating current, according to Lenz's law, the first tongue end face 111 of the C-shaped iron core 11 generates a magnetic pole of N after the magnetic lines of force are polarized, while the magnetic pole generated by the second tongue end face 112 is S; according to the principle that like poles repel each other and unlike poles attract each other, under the action of electromagnetic force, the first tongue end face 111 generates a repulsive force on the first magnet 231 and an attractive force on the second magnet 232. At the same time, the second tongue end face 112 generates a repulsive force on the third magnet 241 and an attractive force on the fourth magnet 242. Finally, the electromagnetic force vectors generated by the first tongue end face 111 and the second tongue end face 112 act on the swing arm 21 to push the swing arm 21 to twist clockwise.

[0041] Alternatively, the working principle of the present invention is as follows: assuming that the positive half cycle of the input alternating current is used, according to Lenz's law, the magnetic pole generated by the first tongue end face 111 of the C-shaped iron core 11 after the magnetic line of force is polarized is N, and the magnetic pole generated by the second tongue end face 112 is S; the magnetic pole on the outer side of the first magnet 231 is S, and the magnetic pole on the outer side of the second magnet 232 is N; the magnetic pole on the outer side of the third magnet 241 is N, and the magnetic pole on the outer side of the fourth magnet 242 is S. According to the principle that magnetic poles of the same name repel each other and poles of opposite names attract each other, under the action of electromagnetic force, the first tongue end face 111 generates an adsorption force on the first magnet 231 and a repulsive force on the second magnet 232. At the same time, the second tongue end face 112 generates an adsorption force on the third magnet 241 and a repulsive force on the fourth magnet 242. Finally, the electromagnetic force vectors generated by the first tongue end face 111 and the second tongue end face 112 act on the swing arm 21 to push the swing arm 21 to twist counterclockwise. When the positive half cycle of the alternating current is completed and alternately transitions to the negative half cycle, the current will reach a zero point. At this time, the electromagnetic force of the C-shaped iron core 11 disappears, and the first and second magnets generate adsorption force on the first tongue end face 111 through their inherent permanent magnetic force, and the third and fourth magnets 241 and 242 generate adsorption force on the second tongue end face 112 through their own inherent permanent magnetic force. Under the action of the adsorption force, the swing arm 21 quickly tends to be centered and balanced. When transitioning to the negative half cycle of the alternating current, according to Lenz's law, the first tongue end face 111 of the C-shaped iron core 11 generates a magnetic pole S after the magnetic lines of force are polarized, while the magnetic pole generated by the second tongue end face 112 is N; according to the principle that like poles repel each other and unlike poles attract each other, under the action of electromagnetic force, the first tongue end face 111 generates a repulsive force on the first magnet 231 and an attractive force on the second magnet 232. At the same time, the second tongue end face 112 generates a repulsive force on the third magnet 241 and an attractive force on the fourth magnet 242. Finally, the electromagnetic force vectors generated by the first tongue end face 111 and the second tongue end face 112 act on the swing arm 21 to push the swing arm 21 to twist clockwise.

[0042] The above two principles only make the magnetic poles of the first and second magnets and the third and fourth magnets swapped, and the effects achieved are the same. That is to say, after the positive and negative half-cycles of an electromagnetic drive signal cycle are changed, the magnetic poles of the first tongue end face 111 and the second tongue end face 112 are swapped to cooperate with the first group of magnets 23 and the second group of magnets 24 to drive the swing arm 21 to swing back and forth at least once; when the alternating current is 0, the electromagnetic force of the C-shaped iron core 11 disappears, the first and second magnets 231 and 232 generate an adsorption force on the first tongue end face 111 through their inherent permanent magnetic force, and the third and fourth magnets 241 and 242 generate an adsorption force on the second tongue end face 112 through their own inherent permanent magnetic force, and the swing arm 21 quickly tends to the center balance under the action of the adsorption force, so that the swing arm 21 is driven by the permanent magnetic force of the magnet to quickly achieve the center reset, so as to replace the reset spring to achieve the reset function.

[0043] After experiencing the positive and negative half cycles of the driving signal, an action cycle is completed, which determines that the blade group is driven to swing once in one action cycle. Therefore, changing the frequency of the alternating current can achieve the change of the frequency of the blade group's working output. By increasing the frequency of the alternating current, the reciprocating torque output frequency of the motor can be increased, thereby improving the shearing efficiency of the blade group. Because the frequency is variable, the present invention can be said to belong to the category of power frequency conversion technology, which effectively solves the problem of low shearing efficiency of the traditional balanced magnetic pendulum design, which constitutes a significant advantage of the present invention.

[0044] The strength of the permanent magnetic force of the first magnet 231, the second magnet 232, the third magnet 241 and the fourth magnet 242 determines the elastic modulus similar to that of a compression spring, and the magnetic force strength is proportional to the elastic modulus, that is, the magnitude of the magnetic force of the magnet can determine the resonant frequency of the swing motor, and the magnetic gap is inversely proportional to the inherent resonant frequency of the swing motor, and the inherent permanent magnetic force of the magnet is proportional to the inherent resonant frequency of the swing motor; based on the principle of the simple harmonic model, if the frequency of the alternating current is consistent with the inherent resonant frequency of the swing motor, a sharp increase in the swing amplitude will result, thereby entering an efficient resonant output, that is, the operating frequency of the swing motor can be adjusted by adjusting the permanent magnetic force strength of the magnet and a reasonable magnetic gap.

[0045] The outer side surfaces of the first tongue end face 111 and the second tongue end face 112 are both arc surfaces and are on the same circumference and concentric with the rotation center of the swing arm; the arc surfaces of the first magnet 231, the second magnet 232, the third magnet 241 and the fourth magnet 242 are on the same circumference and concentric with the rotation center of the swing arm, thereby ensuring that at any time, the magnetic gap between the outer side surface of the first magnet 231 and the first tongue end face 111 and the magnetic gap between the outer side surface of the second magnet 232 and the second tongue end face 112 are equal; the magnetic gap between the outer side surface of the third magnet 241 and the second tongue end face 112 and the magnetic gap between the outer side surface of the fourth magnet 242 and the second tongue end face 112 are equal, and the above four magnetic gaps are the same, ensuring the stability and smoothness of the rotation and swing of the swing arm.

[0046] In order to overcome the problem that the eddy current generated by the skin effect of high-frequency current will lead to low electromagnetic conversion efficiency, motor heating and other defects, the design of the C-type iron core 11 is usually composed of a stacked silicon steel sheet group. In order to further reduce the eddy current, the surface of the silicon steel sheet can be subjected to high-temperature oxidation treatment. In other words, the C-type iron core 11 is composed of multiple silicon steel sheets stacked and fixed together.

[0047] The magnetic collecting seat 22 is composed of multiple magnetic material sheets stacked and fixed together. The outer side surface of the magnetic collecting seat 22 is arc-shaped, and four arc-shaped grooves 220 are arranged on the outer side surface of the magnetic collecting seat 22. The first magnet 231, the second magnet 232, the third magnet 241 and the fourth magnet 242 are installed in the four arc-shaped grooves 200 in sequence, and the outer sides of the first magnet 231, the second magnet 232, the third magnet 241 and the fourth magnet 242 all protrude from the arc-shaped groove 220, so that the first magnet 231, the second magnet 232, the third magnet 241 and the fourth magnet 242 can be separated from each other to avoid mutual influence of magnetic forces between two adjacent magnets.

[0048] The swing arm 21 is formed by injection molding of a steel material or a nylon material, and the swing arm 21 and the magnetic collecting seat 22 are fixed together by in-mold injection molding, so that the magnetic collecting seat 22 can be firmly combined with the swing arm, and there is no gap between them, so as to avoid the noise and energy transmission loss caused by the loose gap between the two due to high-frequency vibration, and improve the overall reliability. Among them, the magnetic collecting seat 22 is relatively installed with the first magnet 231, the second magnet 232, the third magnet 241 and the fourth magnet 242. The other side is formed with a connecting part 221, and the outer side of the connecting part 221 is provided with a plurality of fixing grooves 222, and the swing arm 21 wraps the connecting part 221, and the swing arm 21 is partially integrated into the fixing groove 222. The other end of the swing arm 21 is relatively provided with the magnetic collecting seat 22, and the driving shaft 210 is connected to the knife group 20.

[0049] The first coil 12 and the second coil 13 are connected in parallel, or the first coil 12 and the second coil 13 are connected in series.

[0050] The electromagnetic coil module 1 also includes a frame 14 and an upper fixing plate 15 and a lower fixing plate 16 made of metal electrolytic iron; the C-shaped iron core 11 is inserted into the frame 14, and the first coil 12 and the second coil 13 are respectively wound around the outer sides of the frame 14 and sleeved on both sides of the C-shaped iron core 11; the upper fixing plate 15 and the lower fixing plate 16 are respectively fixed to the upper end surface and the lower end surface of the frame 14 by screws, and the upper fixing plate 15 and the lower fixing plate 16 also cover the first coil 12 and the second coil 13.

[0051] A bearing 211 is provided in the middle of the swing arm 21, and a central shaft 212 is passed through the bearing 211. The upper and lower ends of the central shaft 212 are respectively passed through the upper shaft hole 151 of the upper fixing plate 15 and the lower shaft hole 161 of the lower fixing plate 16, so as to ensure that the swing arm 21 is stably installed on the upper fixing plate 15 and the lower fixing plate 16 bracket, and the swing arm 21 can rotate smoothly. An upper washer 213 is provided between the upper end of the swing arm 21 and the upper fixing plate 15; a lower washer 214 is provided between the lower end of the swing arm 21 and the lower fixing plate 16. Through the design of the upper washer 213 and the lower washer 214, the swing arm 21 can be prevented from directly contacting the upper fixing plate 15 and the lower fixing plate 16, and wear and tear can be avoided to affect the working efficiency and working quality of the present invention.

[0052] The high-frequency electromagnetic swing motor of the present invention also includes a DC-to-AC module, which converts the DC current into an AC current, and then outputs the AC current to the first coil 12 and the second coil 13, and the working frequency of the AC current is set to any value between 60-200 Hz. The working frequency of the AC current can be set according to the actual cutting requirements to realize the power frequency conversion function. Specifically, the DC-to-AC module is a control circuit board 51 that can provide power alternating current, and a rechargeable battery 52 is installed under the control circuit board 51, and a rechargeable interface 53 is set at the tail of the electric hair clipper 50.

[0053] The present invention is a DC power supply, and the first coil 12 and the second coil 13 are supplied with power by a DC to AC module. The first coil 12 and the second coil 13 input alternating current, which belongs to a variable frequency working mode with adjustable frequency. The typical working frequency is set to 135Hz, which is higher than the common 50 / 60HZ magnetic pendulum electric hair clipper powered by the mains. Due to the increase in the swing frequency, the shearing efficiency is about slightly 2 times or more than the common balanced magnetic pendulum electric hair clipper, and the typical swing frequency is 8100 times / minute.

[0054] In summary, the present invention uses the permanent magnetic force of the magnet to drive the swing arm 21 to quickly achieve centering reset, thereby replacing the reset spring to achieve the reset function. Since there is no reset spring or brush that is prone to fatigue failure or easy to wear, it has basic excellence in long-life design requirements and meets the requirements of long life, high shear efficiency and low cost. In addition, the present invention belongs to the balanced pendulum method, has low vibration when held in hand, and ensures user comfort, which makes the present invention extremely competitive in the market.

[0055] Of course, the above description is only a specific embodiment of the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes or modifications made according to the structure, characteristics and principles described in the patent application scope of the present invention should be included in the patent application scope of the present invention.

Claims

1. A high-frequency electromagnetic swing motor, comprising an electromagnetic coil module (1) and a swing arm assembly (2) matched with the electromagnetic coil module (1), characterized in that: The electromagnetic coil module (1) comprises a C-shaped iron core (11), a first coil (12) and a second coil (13) which are sleeved on both sides of the C-shaped iron core (11) and electrically connected, and the two ends of the C-shaped iron core (11) respectively have a first tongue end surface (111) and a second tongue end surface (112) in the shape of an arc; The swing arm assembly (2) comprises a swing arm (21), a magnetic collecting seat (22) fixed to the rear end of the swing arm (21), and a first group of magnets (23) and a second group of magnets (24) arranged on the outer side surface of the magnetic collecting seat (22) and respectively adapted to the first and second tongue end surfaces (111, 112); The first group of magnets (23) comprises a first magnet (231) and a second magnet (232) which are spaced apart and have outer side surfaces configured as arc surfaces, and the magnetic poles of the outer side surfaces of the first magnet (231) and the second magnet (232) are of opposite names, and the magnetic gap between the outer side surface of the first magnet (231) and the first tongue end surface (111) and the magnetic gap between the outer side surface of the second magnet (232) and the second tongue end surface (112) are equal; The second group of magnets (24) comprises a third magnet (241) and a fourth magnet (242) which are spaced apart and have outer side surfaces which are both configured as arc surfaces, and the magnetic poles of the outer side surfaces of the third magnet (241) and the fourth magnet (242) are of different names, and the third magnet (241) is located beside the second magnet (232), and the magnetic poles of the outer side surfaces of the third magnet (241) and the second magnet (232) are of the same name; the magnetic gap between the outer side surface of the third magnet (241) and the second tongue end surface (112) is equal to the magnetic gap between the outer side surface of the fourth magnet (242) and the second tongue end surface (112); After an alternating current is input into the first coil (12) and the second coil (13), the magnetic collecting seat (22) and the C-shaped iron core (11) form a closed magnetic circuit, and the magnetic poles formed by the first tongue end surface (111) and the second tongue end surface (112) are mutually opposite in name, and after the positive and negative half-cycles of an electromagnetic drive signal cycle are changed, the magnetic poles of the first tongue end surface (111) and the second tongue end surface (112) are interchanged to cooperate with the first group of magnets (23) and the second group of magnets (24) to drive the swing arm (21) to swing back and forth at least once; When the alternating current phase is at zero point and the input current is zero or approaches zero, the electromagnetic force of the C-shaped iron core (11) is weakened or becomes zero, the first and second magnets (231, 232) are attracted to the first tongue end surface (111) by their inherent permanent magnetic force, and the third and fourth magnets (241, 242) are attracted to the second tongue end surface (112) by their own inherent permanent magnetic force, thereby driving the swing arm (21) to quickly achieve centering reset through the permanent magnetic force of the magnets, thereby replacing the reset spring to achieve the reset function.

2. The high frequency electromagnetic oscillating motor according to claim 1, characterized in that: Assuming that the positive half cycle of the input alternating current is in progress, according to Lenz's law, the magnetic pole generated by the first tongue end face (111) of the C-shaped iron core (11) after the magnetic field lines are polarized is S, while the magnetic pole generated by the second tongue end face (112) is N; the magnetic pole on the outer side of the first magnet (231) is N, and the magnetic pole on the outer side of the second magnet (232) is S; the magnetic pole on the outer side of the third magnet (241) is S, and the magnetic pole on the outer side of the fourth magnet (242) is N. Based on the mutual repulsion of magnetic poles of the same name, , the principle of attraction between opposites, under the action of electromagnetic force, the first tongue end surface (111) generates an adsorption force on the first magnet (231) and a repulsive force on the second magnet (232), and at the same time, the second tongue end surface (112) generates an adsorption force on the third magnet (241) and a repulsive force on the fourth magnet (242), and finally the electromagnetic force vectors generated by the first tongue end surface (111) and the second tongue end surface (112) act on the swing arm (21) to push the swing arm (21) to twist counterclockwise; When the alternating current completes the positive half cycle and alternately transitions to the negative half cycle, the current will reach a zero point, at which time the electromagnetic force of the C-shaped iron core (11) disappears, the first and second magnets (231, 232) generate an adsorption force on the first tongue end surface (111) through their inherent permanent magnetic force, and the third and fourth magnets (241, 242) generate an adsorption force on the second tongue end surface (112) through their inherent permanent magnetic force, and the swing arm (21) quickly tends to be centered and balanced under the action of the adsorption force; When the alternating current transitions to the negative half cycle, according to Lenz's law, the magnetic pole generated by the first tongue end face (111) of the C-shaped iron core (11) after the magnetic lines of force are polarized is N, while the magnetic pole generated by the second tongue end face (112) is S; according to the principle that magnetic poles of the same name repel each other and poles of different names attract each other, under the action of electromagnetic force, the first tongue end face (111) generates a repulsive force on the first magnet (231) and an attractive force on the second magnet (232); at the same time, the second tongue end face (112) generates a repulsive force on the third magnet (241) and an attractive force on the fourth magnet (242); finally, the electromagnetic force vectors generated by the first tongue end face (111) and the second tongue end face (112) act on the swing arm (21) to push the swing arm (21) to twist clockwise.

3. The high frequency electromagnetic oscillating motor according to claim 1, characterized in that: The strength of the permanent magnetic force of the first magnet (231), the second magnet (232), the third magnet (241) and the fourth magnet (242) determines an elastic modulus similar to a compression spring, and the magnetic force strength is proportional to the elastic modulus, that is, the magnitude of the magnetic force of the magnet can determine the resonant frequency of the oscillating motor, and the magnetic gap is inversely proportional to the inherent resonant frequency of the oscillating motor, and the inherent permanent magnetic force of the magnet is proportional to the inherent resonant frequency of the oscillating motor; Based on the principle of simple harmonic model, if the frequency of the alternating current is consistent with the inherent resonant frequency of the swing motor, the swing amplitude will increase sharply, thus entering into efficient resonant output, that is, the operating frequency of the swing motor can be adjusted by adjusting the permanent magnetic strength of the magnet and a reasonable magnetic gap.

4. The high-frequency electromagnetic oscillating motor according to any one of claims 1 to 3, characterized in that: The outer side surfaces of the first tongue end surface (111) and the second tongue end surface (112) are both arc surfaces and are on the same circumference and concentric with the rotation center of the swing arm; the arc surfaces of the first magnet (231), the second magnet (232), the third magnet (241) and the fourth magnet (242) are on the same circumference and concentric with the rotation center of the swing arm.

5. The high frequency electromagnetic oscillating motor according to claim 4, characterized in that: The magnetic collecting seat (22) is composed of a plurality of magnetic material sheets stacked and fixed together, the outer side surface of the magnetic collecting seat (22) is arc-shaped, and the outer side surface of the magnetic collecting seat (22) is provided with four arc-shaped grooves (220) distributed at intervals, the first magnet (231), the second magnet (232), the third magnet (241) and the fourth magnet (242) are installed in the four arc-shaped grooves (220) in sequence, and the outer side surfaces of the first magnet (231), the second magnet (232), the third magnet (241) and the fourth magnet (242) all protrude outside the arc-shaped grooves.

6. The high frequency electromagnetic oscillating motor according to claim 4, characterized in that: The swing arm (21) is formed by injection molding of a steel material or a nylon material, and the swing arm (21) and the magnetic collecting seat (22) are integrally formed by in-mold injection molding; the first coil (12) and the second coil (13) are connected in parallel, or the first coil (12) and the second coil (13) are connected in series.

7. The high frequency electromagnetic oscillating motor according to claim 5, characterized in that: A connecting portion (221) is formed on the other side of the magnetic collecting seat (22) on which the first magnet (231), the second magnet (232), the third magnet (241) and the fourth magnet (242) are mounted, and a plurality of fixing grooves (222) are arranged on the outside of the connecting portion (221); the swing arm (21) wraps around the connecting portion (221), and the swing arm (21) is partially integrated into the fixing groove (222).

8. The high frequency electromagnetic oscillating motor according to claim 4, characterized in that: The electromagnetic coil module (1) further comprises a frame (14) and an upper fixing plate (15) and a lower fixing plate (16) made of electrolytic metal iron; the C-shaped iron core (11) is inserted into the frame (14); the first coil (12) and the second coil (13) are respectively wound around the outer sides of the frame (14) and sleeved on the two sides of the C-shaped iron core (11); the upper fixing plate (15) and the lower fixing plate (16) are respectively fixed to the upper end surface and the lower end surface of the frame (14) by screws, and the upper fixing plate (15) and the lower fixing plate (16) also cover the first coil (12) and the second coil (13).

9. The high frequency electromagnetic oscillating motor according to claim 8, characterized in that: A bearing (211) is provided in the middle of the swing arm (21), and a central rotating shaft (212) is passed through the bearing (211). The upper and lower ends of the central rotating shaft (212) are respectively passed through an upper shaft hole (151) of an upper fixing plate (15) and a lower shaft hole (161) of a lower fixing plate (16). An upper washer (213) is provided between the upper end of the swing arm (21) and the upper fixing plate (15); a lower washer (214) is provided between the lower end of the swing arm (21) and the lower fixing plate (16); and a driving shaft (210) is provided at the other end of the swing arm (21) opposite to the magnetic collecting seat (22), and the driving shaft (210) is connected to the knife group (20).

10. The high-frequency electromagnetic oscillating motor according to any one of claims 5 to 9, characterized in that: The high-frequency electromagnetic swing motor also includes a DC to AC conversion module, which converts the input DC current into an alternating current and then outputs the alternating current to the first coil (12) and the second coil (13), and the operating frequency of the alternating current is set to any value between 60 and 200 Hz.

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