A reluctance motor lock

Abstract

The present invention discloses a reluctance motor lock, which relates to the technical field of electromagnetic locks and includes a stator, a rotor, a coil bobbin, a return spring and a lock rod; the lock rod is slidably assembled on the stator, the rotor is fixedly assembled on the lock rod, and the return spring is sleeved on the lock rod to drive the lock rod to reset; a coil groove is formed on the end face of the stator corresponding to the rotor, the coil bobbin is assembled in the coil groove, a tooth groove corresponding to the coil groove is formed on the end face of the rotor corresponding to the stator, and an air gap is provided between the stator and the rotor. The air gap includes an end air gap located between the ends of the stator and the rotor and a tooth groove air gap near the tooth groove; when the coil bobbin is energized, the stator, the rotor and the air gap between the stator and the rotor form an entire magnetic circuit. The present invention optimizes the magnetic circuit design of the lock body in combination with the reluctance motor principle, makes full use of the tooth groove effect and the end effect force, enables the rotor of the lock body to move within a specified range, and the magnetic force output by the rotor does not show a very obvious change.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic locks, and more specifically to a reluctance motor lock. Background Art

[0002] Currently, electromagnetic locks in the electric door industry usually adopt the principle of conventional electromagnets, and the common action stroke is about 10 mm. Since the suction force of the electromagnet will have a very obvious attenuation phenomenon as the action stroke increases, there is often a phenomenon that the action force at the far end of the electromagnetic lock stroke is insufficient in actual use.

[0003] The invention patent application publication document with the publication date of August 26, 2015, the publication number of CN104863431A, and the name of "Electric Door Opener" provides the following technical solution: An electric door opener includes a housing, a lock plate that can be flipped inside the housing. There is a locking tongue placement space between the lock plate and the housing. One end of the lock plate that locks with the locking tongue is the locking end, and the other end is the limiting end. Inside the housing, at the limiting end of the lock plate, there is an electromagnetic coil and an armature. The armature is provided with a limiting post that can abut against the limiting end of the lock plate. Inside the housing, at the lifting stroke of the limiting post, there is an auxiliary elastic member that can limit the limiting post and can be driven by an external force to release the limit from the limiting post. The auxiliary elastic member includes an installation end and an auxiliary limiting end, and the installation end and the auxiliary limiting end are connected by a limit release driving end.

[0004] In the above-mentioned prior art solution, the suction force between the electromagnetic coil and the armature will have a very obvious attenuation phenomenon as the action stroke increases, and there is often a phenomenon that the action force at the far end of the electromagnetic lock stroke is insufficient in actual use. Summary of the Invention

[0005] In order to overcome the defects and deficiencies existing in the above-mentioned prior art, the present invention provides a reluctance motor lock. The object of the present invention is to solve the problem of obvious attenuation of the magnetic force at the far end of the electromagnetic lock stroke existing in the above-mentioned prior art. The reluctance motor lock of the present invention includes a mover, a stator, a coil bobbin, a spring, and a lock rod. The mover is fixedly assembled on the lock rod. The stator is provided with a coil slot for accommodating the coil bobbin, and the coil bobbin is assembled in the coil slot. The mover is provided with a tooth slot that cooperates with the coil slot. The lock rod is slidably fitted on the stator, and the spring is assembled on the lock rod to drive the lock rod to reset. The present invention optimizes the magnetic circuit design of the lock body in combination with the reluctance motor principle, makes full use of the tooth slot effect force and the end effect force, enables the mover of the lock body to move within a specified range, and the magnetic force output by the mover will not show a very obvious change, effectively solving the problem of obvious attenuation of the magnetic force at the far end of the traditional electromagnetic lock stroke.

[0006] In order to solve the problems existing in the above-mentioned prior art, the present invention is realized through the following technical solutions.

[0007] The present invention discloses a reluctance motor lock, which includes a stator, a rotor, a coil bobbin, a return spring and a lock rod; the lock rod is slidably assembled on the stator, the rotor is fixedly assembled on the lock rod, and the return spring is sleeved on the lock rod to drive the lock rod to reset; a coil slot is formed on the end face of the stator corresponding to the rotor, the coil bobbin is assembled in the coil slot, a tooth slot corresponding to the coil slot is formed on the end face of the rotor corresponding to the stator, and an air gap is provided between the stator and the rotor. The air gap includes an end air gap between the ends of the stator and the rotor and a tooth slot air gap near the tooth slot; when the coil bobbin is energized, the stator, the rotor and the air gap between the stator and the rotor form an entire magnetic circuit. When the rotor moves, an end effect force is generated in the end air gap and a tooth slot effect force is generated in the tooth slot air gap.

[0008] Furthermore, the end air gap includes an upper end air gap and a lower end air gap, and the tooth slot air gap includes an upper tooth slot air gap and a lower tooth slot air gap; the upper end air gap is provided between the top end of the rotor and the top end of the stator, and the lower end air gap is provided between the bottom end of the rotor and the bottom end of the stator; the upper tooth slot air gap is provided between the upper tooth part of the rotor and the upper tooth part of the stator, and the lower tooth slot air gap is provided between the lower tooth part of the rotor and the lower tooth part of the stator.

[0009] Furthermore, the length of the upper tooth part of the rotor is greater than the displacement of the rotor, the length of the upper tooth part of the stator is greater than or equal to the length of the upper tooth part of the rotor, and the length of the bottom of the tooth slot is greater than the length of the upper tooth part of the stator.

[0010] Furthermore, the upper tooth slot air gap and the lower tooth slot air gap are of equal size, and the depth of the tooth slot is 5-10 times the size of the upper tooth slot air gap.

[0011] Furthermore, the displacement of the rotor relative to the stator is 2 mm - 8 mm.

[0012] Furthermore, the stator includes a coil assembly part for assembling the coil bobbin and a lock rod assembly part for assembling the lock rod, and the coil assembly part and the lock rod assembly part are arranged perpendicularly; the lower end air gap is formed between the lock rod assembly part and the rotor; a limit step is provided at the end of the rotor away from the stator, and the upper end air gap is formed between the limit step and the stator.

[0013] Furthermore, both the stator and the rotor are made of Q235 material.

[0014] Furthermore, a sleeve Ⅰ is sleeved on the extending end of the lock rod, and the sleeve Ⅰ cooperates with the rotor fixedly assembled on the lock rod to limit the extending stroke of the lock rod; a sleeve Ⅱ is provided at the end of the lock rod assembled with the stator, and the sleeve Ⅱ is fixedly assembled on the stator, and the lock rod moves relative to the sleeve Ⅱ.

[0015] Further, a reset step for adapting to the reset spring is provided on the lock rod. After the reset spring is sleeved on the lock rod, one end of the reset spring contacts the reset step, and the other end contacts the second shaft sleeve.

[0016] Further, the coil-carrying skeleton includes a skeleton and an electromagnetic coil. The electromagnetic coil is wound around the skeleton. After the coil-carrying skeleton is assembled in the coil groove, the electromagnetic coil is located between the skeleton and the stator.

[0017] The working principle of the reluctance motor lock of the present invention is as follows: Applying a current to the coil-carrying skeleton provides magnetomotive force for the entire magnetic circuit. The magnetic circuit is composed of the mover, the stator, and the air gap between them. The reset spring provides a restoring force for the lock rod, and the lock rod provides a supporting function and conducts the acting force externally. After a current is applied to the coil-carrying skeleton, a complete magnetic circuit is formed through the mover, the stator, and the air gap between the mover and the stator. The acting force is generated by using the tooth-slot effect force and the end effect force between the stator and the mover to provide the acting force externally, driving the lock rod to compress the reset spring to store elastic force. When the current on the coil-carrying skeleton is removed, the magnetomotive force disappears, the magnetic flux of the entire magnetic circuit disappears, and the corresponding electromagnetic force, tooth-slot force, and end effect force all disappear. The elastic force stored in the reset spring is released, driving the lock rod and the mover to return to the specified position.

[0018] Compared with the prior art, the beneficial technical effects brought by the present invention are as follows:

[0019] 1. By optimizing the magnetic circuit design of the lock body based on the reluctance motor principle, the present invention makes full use of the tooth-slot effect force and the end effect force, enabling the mover of the lock body to move within a specified range without a significant change in the magnetic force output by the mover. This effectively solves the problem of obvious magnetic force attenuation at the far end of the stroke of the traditional electromagnetic lock.

[0020] 2. In the present invention, in the magnetic circuit design of the mover and the stator, by reasonably increasing the outer shape structures such as the ends and tooth slots, the electromagnetic force, tooth-slot effect force, and end effect force of the entire motor lock do not change significantly when the mover moves within the moving range.

[0021] 3. By performing finite element analysis on the reluctance motor lock at positions with relative positions of 2 mm, 4 mm, 6 mm, and 8 mm respectively, the acting force provided by the reluctance motor lock externally at the corresponding positions can be obtained. It is obtained that when the displacement of the mover in the reluctance motor of the present invention is controlled within the range of 2 mm - 8 mm, the acting force output by the reluctance motor lock externally does not change significantly.

[0022] 4. In the present invention, Q235 material is selected to manufacture the rotor and stator, so that the rotor and stator maintain certain magnetic permeability, and the magnetic permeability is stable. At the same time, the structural strength of the rotor and stator is also ensured.

[0023] 5. The reluctance motor lock of the present invention has a simple structure, stable operation, is convenient for assembly and maintenance, and has a low manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of the composition of the key components of the reluctance motor lock of the present invention;

[0025] Figure 2 Schematic diagram of the magnetic circuit of the reluctance motor lock of the present invention;

[0026] Figure 3 Schematic diagram of the process of generating reluctance torque by a rotating reluctance motor (θ = 0°);

[0027] Figure 4 Schematic diagram of the process of generating reluctance torque by a rotating reluctance motor (θ = 45°);

[0028] Figure 5 Schematic diagram of the magnetic circuit of the magnetic resistance force generated by the distortion of the air-gap magnetic field of the reluctance motor lock of the present invention;

[0029] Figure 6 Schematic diagram of the magnetic circuit of the magnetic resistance force generated by the non-distortion of the air-gap magnetic field of the reluctance motor lock of the present invention;

[0030] Figure 7 Schematic diagram of the electromagnetic force magnetic circuit;

[0031] Figure 8 Force curves of each action of the reluctance motor lock;

[0032] Figure 9 Schematic diagram of the magnetic circuit of a traditional electromagnetic lock;

[0033] Figure 10 Force curve of the traditional electromagnetic lock;

[0034] Figure 11 Finite element analysis diagram of the traditional electromagnetic lock at a displacement of 2 mm;

[0035] Figure 12 Finite element analysis diagram of the traditional electromagnetic lock at a displacement of 4 mm;

[0036] Figure 13 Finite element analysis diagram of the traditional electromagnetic lock at a displacement of 6 mm;

[0037] Figure 14 Finite element analysis diagram of the traditional electromagnetic lock at a displacement of 8 mm;

[0038] Figure 15The acting force of the reluctance motor lock of the present invention in the specified position;

[0039] Figure 16 The finite element analysis diagram of the reluctance motor lock of the present invention at a displacement of 2 mm;

[0040] Figure 17 The finite element analysis diagram of the reluctance motor lock of the present invention at a displacement of 4 mm;

[0041] Figure 18 The finite element analysis diagram of the reluctance motor lock of the present invention at a displacement of 6 mm;

[0042] Figure 19 The finite element analysis diagram of the reluctance motor lock of the present invention at a displacement of 8 mm;

[0043] Reference numerals: Figure 1 In, 1. Rotor, 2. Stator, 3. With coil skeleton, 4. Return spring, 5. Lock rod, 6. Sleeve Ⅰ, 7. Sleeve Ⅱ, 8. Return step, 9. Skeleton, 10. Electromagnetic coil, 11. Coil slot, 12. Tooth slot, 13. Air gap, 14. Coil assembly part, 15. Lock rod assembly part, 16. Limit step;

[0044] Figure 2 In, 1 Rotor, 2 Stator, 03 Upper end air gap, 04 Lower end air gap, 05 Tooth slot, 06 Upper tooth slot air gap, 07 Lower tooth slot air gap, 08 Bottom slot length, 09 Bottom slot depth, 010 Rotor upper tooth part length, 011 Stator upper tooth part length, 012 Rotor end edge, 013 Stator end edge. Detailed implementation manners

[0045] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the protection scope of the present invention.

[0046] To illustrate the technical implementation process of the present invention, first, the generation process of reluctance torque is analyzed through a rotating reluctance motor as shown in Figure 3 and 4 shown. Figure 3 In, when θ = 0°, the axis of the air gap magnetic field does not shift, that is, the air gap magnetic field does not distort and no reluctance torque is generated; Figure 4 In, when θ = 45°, due to the change in the rotor position, the axis of the air gap magnetic field shifts, so a reluctance torque is generated, and the direction of this torque makes the rotor return to the position of θ = 0°.

[0047] The magnetoresistive motor lock of the present invention utilizes the same principle, except that in the structural design, the rotational torque is transformed into a linear force. As Figure 1 shown, this embodiment discloses a magnetoresistive motor lock, which includes a stator 2, a mover 1, a coil bobbin 3, a return spring 4, and a lock rod 5; the lock rod 5 is slidably assembled on the stator 2, the mover 1 is fixedly assembled on the lock rod 5, and the return spring 4 is sleeved on the lock rod 5 to drive the lock rod 5 to reset; a coil slot 11 is formed on the end face of the stator 2 corresponding to the mover 1, the coil bobbin 3 is assembled in the coil slot 11, a tooth slot 12 corresponding to the coil slot 11 is formed on the end face of the mover 1 corresponding to the stator 2, and an air gap 13 is provided between the stator 2 and the mover 1. The air gap 13 includes an end air gap between the ends of the stator 2 and the mover 1, and a tooth slot air gap near the tooth slot 12; when the coil bobbin 3 is energized, the stator 2, the mover 1, and the air gap 13 between the stator 2 and the mover 1 form the entire magnetic circuit. When the mover 1 moves, an end effect force is generated in the end air gap, and a tooth slot effect force is generated in the tooth slot air gap.

[0048] As Figure 1 shown, the working principle of this embodiment is as follows: A current is applied to the coil bobbin 3 to provide magnetomotive force for the entire magnetic circuit. The magnetic circuit is composed of the mover 1, the stator 2, and the air gap 13 between the two. The return spring 4 provides a restoring force for the lock rod 5, and the lock rod 5 provides a supporting function and conducts the acting force externally. After a current is applied to the coil bobbin 3, a magnetic circuit is formed through the mover 1, the stator 2, and the air gap 13 between the mover 1 and the stator 2. The acting force is generated by using the tooth slot effect force and the end effect force of the stator 2 and the mover 1 to provide an acting force externally, driving the lock rod 5 to compress the return spring 4 to store elastic force. When the current on the coil bobbin 3 is removed, the magnetomotive force disappears, the magnetic flux of the entire magnetic circuit disappears, and the corresponding electromagnetic force, tooth slot force, and end effect force all disappear. The elastic force stored in the return spring 4 is released, driving the lock rod 5 and the mover 1 to return to the specified position.

[0049] In this embodiment, by optimizing the magnetic circuit design of the lock body based on the magnetoresistive motor principle, making full use of the tooth slot effect force and the end effect force, the mover 1 of the lock body can move within a specified range, and the magnetic force output by the mover 1 will not change significantly. It effectively solves the problem that the magnetic force decays significantly at the far end of the stroke of the traditional electromagnetic lock.

[0050] As Figure 2 described, Figure 2 in, 1 mover, 2 stator, 03 upper end air gap, 04 lower end air gap, 05 tooth slot, 06 upper tooth slot air gap, 07 lower tooth slot air gap, 08 bottom slot length, 09 bottom slot depth, 010 length of the upper tooth part of the mover, 011 length of the upper tooth part of the stator, 012 edge of the mover end, 013 edge of the stator end.

[0051] Let the length of the 08 bottom slot be a, the depth of the 09 bottom slot be b, the length of the 010 upper tooth part of the mover be c, the length of the 011 upper tooth part of the stator be d, the volume of the 03 upper-end air gap be V3, the volume of the 04 lower-end air gap be V4, the size of the 06 upper air gap in the tooth groove be δ6, and the size of the 07 lower air gap in the tooth groove be δ7.

[0052] According to the theory of determining the magnitude of the magnetic force from the magnetic field energy storage:

[0053] The magnetic field energy storage of the 03 upper-end air gap is:

[0054] ;

[0055] ;

[0056] ;

[0057] Similarly, the magnetic field energy storage of the 04 lower-end air gap is:

[0058] ;

[0059] ;

[0060] ;

[0061] From the calculation formulas of the force F3 at the 03 upper end and the force F4 at the 04 lower end, it can be seen that as the mover moves axially, the magnitudes of V3 and V4 change, and at the same time, the magnitudes of x3 and x4 change. Therefore, an end force is generated, and the direction of the force is the direction in which the magnetic co-energy of the entire system increases, that is, the direction in which the mover moves closer to the stator end.

[0062] Similarly, it can be obtained that:

[0063] The tooth groove force at the 06 upper air gap δ6 in the tooth groove is:

[0064] ;

[0065] The tooth groove force at the 07 lower air gap δ7 in the tooth groove is:

[0066] ;

[0067] From the calculation formulas of the force F6 at the 06 upper air gap in the tooth groove and the force F7 at the 07 lower air gap in the tooth groove, it can be seen that as the mover moves in the x-axis direction, the direction of the force is the direction in which the magnetic co-energy of the entire system increases, that is, the direction in which the mover moves closer to the stator end.

[0068] The resultant force of the magnetic forces on the entire mover is: ;

[0069] The relevant dimensions of the mover and stator in the present invention should meet the following conditions:

[0070] 1. When the designed movement range of the mover in the x-axis direction is 0 - s, the length c of the upper teeth of the 010 mover > s; the length d of the upper teeth of the 011 stator >= c; the length a of the bottom of the 08 slot > d; in this design, the air gap size δ6 in the upper part of the tooth slot and the air gap size δ7 in the lower part of the tooth slot, and ; the optimized design of the present invention is that the depth b of the bottom slot = 5 times δ6 to 10 times δ7.

[0071] 2. In the embodiment of the present invention, the specific values of the above parameters are: s = 8 mm; c = 9 mm; d = 10 mm; a = 15 mm; δ6 = δ7 = 0.5 mm; b = 2.5 mm.

[0072] 3. When the above design requirements are met, within the range of 0 - s, the output force on the mover can achieve Figure 8 the data shown.

[0073] In this embodiment, the displacement of the mover 1 relative to the mover 1 is 2 mm - 8 mm. By performing finite element analysis on the reluctance motor lock at positions with relative positions of 2 mm, 4 mm, 6 mm, and 8 mm respectively, the action force provided by the reluctance motor lock externally at the corresponding positions can be obtained. When the displacement of the mover 1 in the reluctance motor of the present invention is controlled within the range of 2 mm - 8 mm, the action force output by the reluctance motor lock does not change significantly.

[0074] The present invention innovatively designs a magnetic circuit and a magnetic field air gap as shown in Figure 2 , which fully combines the characteristics of the end effect force and the cogging effect force. That is, when operating in the axial direction, the end effect force is generated by using the end air gap. The characteristics of the end effect force are: as the axial distance increases, the value of the end effect force decreases significantly, and as the distance decreases, the value of the end effect force increases significantly. When the distance approaches zero, the end effect force reaches the maximum. The characteristics of the cogging effect force on the side are: as the axial distance increases, the value of the magnetic resistance force gradually increases, and as the distance decreases, the cogging effect force gradually decreases. When the distance approaches zero, the cogging effect force approaches zero. From the perspective of the magnetic field force characteristics, in this application scenario, by combining the characteristics of these two magnetic field forces and reasonably designing the mechanical geometric structure to design the corresponding magnetic field air gap and optimizing the magnetic circuit design (for example, the length-width ratio of the tooth slot and the geometric dimensions of the end), the mover can output a relatively balanced action force, and in principle, solve the problem that the magnetic force of the traditional electromagnetic lock decays significantly as the stroke increases.

[0075] Through the design of the present invention, the electromagnetic energy conversion efficiency of the electromagnetic lock can be effectively improved. Under the condition of the same input power, the minimum value of the external output force of the present invention is 7 times that of the minimum value of the external output force of the traditional electromagnetic lock.

[0076] As Figure 5 shown, when the positions of the mover and the stator are in this state, the air-gap magnetic field is distorted, generating a magnetic drag force, causing the mover to generate an acting force to return to the position state as Figure 6 shown. It can be known from the finite element analysis that this magnetic drag force decreases as the distance between the stator 2 and the mover 1 decreases. From Figure 5 and Figure 6 the distribution of the magnetic force lines, it can be clearly known that when the relative displacement between the mover and the stator is zero, the magnetic force lines in the air gap between the mover and the stator do not undergo "distortion". At this time, the mutual acting force between the stator and the mover approaches zero, and such a situation does not meet the requirement scenario of the electromagnetic lock. To solve this problem, when designing the entire magnetic circuit, an end air gap needs to be added at the ends of the mover and the stator. Utilizing the principle of the end effect force (the essence of the generation of the end effect force is that there is an air gap in the designs of the ends of the stator and the mover, and the change in the external magnetic resistance due to the change in the size of the air gap generates the end effect force), the change in the distance between the mover and the stator causes the change in the air-gap energy storage, thereby generating a relatively large end effect force, and this force increases as the distance between the mover and the stator decreases.

[0077] As Figure 1 described, the stator 2 includes a coil assembly part 14 for assembling the coil bobbin 3 and a lock rod assembly part 15 for assembling the lock rod 5, and the coil assembly part 14 and the lock rod assembly part 15 are arranged perpendicular to each other; a lower end air gap is formed between the lock rod assembly part 15 and the mover 1; a limiting step 16 is provided at the end of the mover 1 far from the stator 2, and an upper end air gap is formed between the limiting step 16 and the stator 2.

[0078] As another implementation manner of this embodiment, both the stator 2 and the mover 1 are made of Q235 material. Selecting Q235 material to make the mover 1 and the stator 2 enables the mover 1 and the stator 2 to maintain a certain magnetic permeability and the magnetic permeability is stable. At the same time, the structural strength of the mover 1 and the stator 2 is also ensured.

[0079] As another implementation manner of this embodiment, a sleeve I 6 is sleeved on the extending end of the lock rod 5, and the sleeve I 6 cooperates with the mover 1 fixedly assembled on the lock rod 5 to define the extending stroke of the lock rod 5; a sleeve II 7 is provided at the end of the lock rod 5 assembled with the stator 2, and the sleeve II 7 is fixedly assembled on the stator 2, and the lock rod 5 moves relative to the sleeve II 7.

[0080] As another implementation manner of this embodiment, a reset step 8 adapted to the reset spring 4 is provided on the lock rod 5. After the reset spring 4 is sleeved on the lock rod 5, one end of the reset spring 4 contacts the reset step 8, and the other end contacts the bushing II 7.

[0081] As another implementation manner of this embodiment, the coil-carrying bobbin 3 includes a bobbin 9 and an electromagnetic coil 10. The electromagnetic coil 10 is wound around the bobbin 9. After the coil-carrying bobbin 3 is assembled in the coil slot 11, the electromagnetic coil 10 is located between the bobbin 9 and the stator 2.

[0082] As Figure 7 shown, the end electromagnetic force of the mover 1 and the stator 2 decreases as the distance increases, and this electromagnetic force is the same as the principle adopted by traditional electromagnetic locks. In the magnetic circuit design of the mover 1 and the stator 2, by reasonably increasing the external shapes such as the ends and tooth grooves, when the mover 1 moves within the moving range, the electromagnetic force, cogging force, and end effect force of the entire motor lock can output a constant external force.

[0083] Since the magnetic resistance decreases as the relative distance between the mover 1 and the stator 2 decreases, and the end electromagnetic force increases as the relative distance between the stator 2 and the mover 1 decreases, by reasonably adjusting the geometric shapes of the mover 1 and the stator 2, the magnetic circuit can be optimized so that when the mover 1 moves within the effective working range, the output action force does not change significantly.

[0084] To illustrate the implementation process of the solution, the relative movement process between the mover 1 and the stator 2 is now divided into two parts for description. The action process data of the magnetic resistance and the action process data of the end electromagnetic force are respectively described.

[0085] From Figure 8 it can be seen that the reluctance motor lock shown in Figure 2 is respectively disassembled into the strong cogging force part shown in Figure 5 and the strong end effect force part disassembled into as shown in Figure 7 shown. The action force data of the strong cogging force part, the action force data of the strong end effect force part, and the entire synthesized data can be obtained through the finite element analysis method. It can be seen from the data analysis that the cogging force increases as the relative distance increases, the end effect force decreases as the relative distance increases, and the action force of the synthesized force has no obvious change in the interval of 2 mm - 8 mm.

[0086] From Figure 8 the data, it can be known that the traditional electromagnetic lock only utilizes the end effect force, and the minimum value of its external output force is 8.2 N at 8 mm; while adopting the design of the present invention, the synthesized magnetic field force generated by the end effect force and the cogging force is utilized at the same time, and the minimum value of its external output force is 57.8 N at 4 mm.

[0087] From the comparison data, it can be seen that within the range of 2 - 8 mm of the mover stroke, with the same input power, the minimum value of the external output force of the present invention is 7 times that of the minimum value of the external output force of the traditional electromagnetic lock.

[0088] As Figure 9 shown, for the electromagnetic lock adopting the traditional electromagnetic principle, when designing the magnetic circuit, insufficient consideration was given to making full use of the magnetic resistance, and no special tooth grooves were designed to generate the tooth groove effect force. Figure 9 Fig. is the magnetic circuit design diagram of the traditional electromagnetic lock. From the distribution of the magnetic force lines in the figure, it can be clearly seen that when the armature moves axially, the magnetic force lines between the armature and the stator do not undergo "distortion" laterally, so no tooth groove force is generated. If appropriate tooth grooves are designed on the side of the armature and the magnetic circuit is reasonably designed to generate additional tooth groove force, then the change of the air-gap magnetic energy when the armature moves axially can be fully utilized to generate a greater acting force in the axial direction of the armature.

[0089] In the finite element analysis, it can be found that as Figure 10 shown, with the increase of the relative distance between the armature and the stator 2, the attenuation of the electromagnetic force is very obvious. Figure 11 Fig. is the finite element analysis diagram and the external acting force reading when the relative distance is 2 mm, Figure 12 Fig. is the finite element analysis diagram and the external acting force reading when the relative distance is 4 mm, Figure 13 Fig. is the finite element analysis diagram and the external acting force reading when the relative distance is 6 mm, Figure 14 Fig. is the finite element analysis diagram and the external acting force reading when the relative distance is 8 mm.

[0090] In this embodiment, through the finite element analysis of the reluctance motor lock at the positions with relative distances of 2 mm, 4 mm, 6 mm, and 8 mm respectively, the acting force curve provided by the reluctance motor lock externally at the corresponding positions can be obtained as Figure 15 shown. It can be seen that within the range of 2 mm - 8 mm, the acting force output externally by the reluctance motor lock does not change significantly.

[0091] Figure 16 Fig. is the finite element analysis diagram and the external acting force reading when the relative distance is 2 mm, Figure 17 Fig. is the finite element analysis diagram and the external acting force reading when the relative distance is 4 mm, Figure 18 Fig. is the finite element analysis diagram and the external acting force reading when the relative distance is 6 mm, Figure 19 Fig. is the finite element analysis diagram and the external acting force reading when the relative distance is 8 mm.

[0092] The above has specifically described the embodiments of the present invention. However, the present invention is not limited to the described embodiments. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalents or substitutions are all included within the scope defined by the claims of the present invention.

Claims

1. A reluctance motor lock, characterized in that: It includes a stator (2), a rotor (1), a coil bobbin (3), a return spring (4) and a locking lever (5); the locking lever (5) is slidably assembled on the stator (2), the rotor (1) is fixedly assembled on the locking lever (5), and the return spring (4) is sleeved on the locking lever (5) to drive the locking lever (5) to reset; a coil slot (11) is provided on the end face of the stator (2) corresponding to the rotor (1), the coil bobbin (3) is assembled in the coil slot (11), a tooth slot (12) corresponding to the coil slot (11) is provided on the end face of the rotor (1) corresponding to the stator (2), and an air gap (13) is provided between the stator (2) and the rotor (1). The air gap (13) includes an end air gap between the ends of the stator (2) and the rotor (1), and a tooth slot air gap near the tooth slot (12); when the coil bobbin (3) is energized, the stator (2), the rotor (1) and the air gap (13) between the stator (2) and the rotor (1) form the entire magnetic circuit. When the rotor (1) moves, an end effect force is generated by the end air gap, and a tooth slot effect force is generated by the tooth slot air gap. The end air gap includes an upper end air gap and a lower end air gap, and the tooth slot air gap includes an upper tooth slot air gap and a lower tooth slot air gap; the upper end air gap is provided between the top of the rotor (1) and the top of the stator (2), and the lower end air gap is provided between the bottom of the rotor (1) and the bottom of the stator (2); the upper tooth slot air gap is provided between the upper tooth part of the rotor (1) and the upper tooth part of the stator (2), and the lower tooth slot air gap is provided between the lower tooth part of the rotor (1) and the lower tooth part of the stator (2). The length of the upper tooth part of the rotor (1) is greater than the displacement of the rotor (1), the length of the upper tooth part of the stator (2) is greater than or equal to the length of the upper tooth part of the rotor (1), and the length of the bottom of the tooth slot (12) is greater than the length of the upper tooth part of the stator (2).

2. The magnetic resistance motor lock according to claim 1, characterized in that: The upper tooth slot air gap and the lower tooth slot air gap are of equal size, and the depth of the tooth slot (12) is 5-10 times the size of the upper tooth slot air gap.

3. The magnetic reluctance motor lock according to claim 2, characterized in that: The displacement of the rotor (1) relative to the stator (2) is 2 mm - 8 mm.

4. The magnetic resistance motor lock according to claim 1, characterized in that: The stator (2) includes a coil assembly part (14) for assembling the coil bobbin (3) and a locking lever assembly part (15) for assembling the locking lever (5). The coil assembly part (14) and the locking lever assembly part (15) are arranged perpendicularly; the lower end air gap is formed between the locking lever assembly part (15) and the rotor (1); a limiting step (16) is provided at the end of the rotor (1) far from the stator (2), and the upper end air gap is formed between the limiting step (16) and the stator (2).

5. The magnetic resistance motor lock according to claim 1, characterized in that: Both the stator (2) and the rotor (1) are made of Q235 material.

6. The magnetic resistance motor lock according to claim 1, wherein: A sleeve I (6) is sleeved on the extending end of the lock rod (5). The sleeve I (6) cooperates with the mover (1) fixedly assembled on the lock rod (5) to define the extending stroke of the lock rod (5). A sleeve II (7) is arranged at the end of the lock rod (5) assembled with the stator (2). The sleeve II (7) is fixedly assembled on the stator (2), and the lock rod (5) moves relative to the sleeve II (7).

7. The magnetic resistance motor lock according to claim 6, wherein: A reset step (8) adapted to the reset spring (4) is arranged on the lock rod (5). After the reset spring (4) is sleeved on the lock rod (5), one end of the reset spring (4) contacts the reset step (8), and the other end contacts the sleeve II (7).

8. The magnetic reluctance motor lock according to claim 1, characterized in that: The coil-carrying skeleton (3) includes a skeleton (9) and an electromagnetic coil (10). The electromagnetic coil (10) is wound around the skeleton (9). After the coil-carrying skeleton (3) is assembled in the coil slot (11), the electromagnetic coil (10) is located between the skeleton (9) and the stator (2).

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