A three-phase claw-pole micro stepping motor

Abstract

The utility model relates to the technical field of stepper motors, specifically a three-phase claw-pole micro-stepping motor, including a housing assembly, wherein the housing assembly is composed of an outer housing, a rear shaft sleeve, a spring sheet and a tail end cover, the bottom end of the outer housing is welded with a spring sheet, and the bottom end of the spring sheet is welded with a tail end cover; the interior of the outer housing is connected with a total coil assembly, and the total coil assembly is composed of an upper coil assembly, a middle coil assembly and a lower coil assembly; the inner side of the total coil assembly is installed with a magnet rotor assembly. The rotor and the metal shaft of the utility model are integrally injection molded, the coaxiality is guaranteed, the pulling force is strong and it is not easy to fall off, compared with the rotor assembly formed by gluing, the glue and curing process are reduced, and the concentricity will be better; at the same time, the total coil assembly is assembled into one by the upper coil assembly, the middle coil assembly and the lower coil assembly through plastic holes and plastic columns, which is more convenient than assembly with bolts and has higher coaxiality.

Description

Technical Field

[0001] The utility model relates to the technical field of short circuits, in particular to a three-phase claw-pole micro-stepping motor. Background Art

[0002] The stepper motor is an open-loop control element that converts electrical pulse signals into angular displacement or linear displacement. In the case of non-overload, the motor's speed and stop position depend only on the frequency and number of pulses of the pulse signal, and are not affected by load changes. When the stepper driver receives a pulse signal, it drives the stepper motor to rotate a fixed angle in the set direction, called the "step angle". Its rotation is performed step by step at a fixed angle.

[0003] At present, most of the automotive air conditioner actuators use DC motors or two-phase claw-pole stepper motors. DC motors have problems such as inaccurate positioning, high speed, and high heat generation, while two-phase claw-pole stepper motors have disadvantages such as large vibration and noise in the low-frequency band and low torque in the high-frequency band. Utility Model Content

[0004] The purpose of the utility model is to provide a three-phase claw-pole micro stepper motor to solve the problems of inaccurate positioning, excessive speed and high heat generation of DC motors in the above background technology, and large vibration and noise in the low-frequency band and small torque in the high-frequency band of two-phase claw-pole stepper motors.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a three-phase claw-pole micro-stepping motor, comprising a housing assembly, wherein the housing assembly is composed of an outer housing, a rear shaft sleeve, a spring sheet and a tail end cover, a spring sheet is welded to the bottom end of the outer housing, and a tail end cover is welded to the bottom end of the spring sheet; a total coil assembly is connected to the inside of the outer housing, and the total coil assembly is composed of an upper coil assembly, a middle coil assembly and a lower coil assembly, and the upper coil assembly, the middle coil assembly and the lower coil assembly are assembled from top to bottom in an integrated manner; a fixing member is fixed to the outer wall of the outer housing by bolts; a magnet rotor assembly is installed on the inner side of the total coil assembly.

[0006] Preferably, a rear bushing is provided at the center position of the bottom of the housing assembly, and the bottom end of the rear bushing passes through the spring sheet and extends to the interior of the tail end cover. A grounding pin is also provided on the surface of the tail end cover, and the grounding pin is used for grounding.

[0007] Preferably, a forearm bracket is fixed to the top end of the upper coil assembly by bolts, and a front shaft sleeve is installed on the top end of the forearm bracket.

[0008] Preferably, the magnet rotor assembly includes a metal shaft, a rotor, a worm and a limit block. The metal shaft is arranged inside the outer casing, and the upper and lower ends of the metal shaft are respectively inserted into the interior of the front shaft sleeve and the rear shaft sleeve.

[0009] Preferably, the surface of the metal shaft is integrally injection-molded with a rotor, and a worm is sleeved on the surface of the metal shaft above the rotor. The surface of the top of the metal shaft is interference-fitted with a limit block, which is used to limit and fix the worm after installation.

[0010] Preferably, the surfaces of the upper coil assembly, the middle coil assembly and the lower coil assembly are respectively integrally injection-molded with plastic columns and plastic holes, and when the total coil assembly is assembled, the plastic columns and the plastic holes cooperate with each other so that the upper coil assembly, the middle coil assembly and the lower coil assembly are assembled into one piece from top to bottom.

[0011] Preferably, PIN pins are spot-welded on the surfaces of the upper coil assembly, the middle coil assembly and the lower coil assembly, and the other end of the PIN pin passes through the fixing piece.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows: the rotor and the metal shaft of the three-phase claw-pole micro-stepping motor are integrally injection molded, the coaxiality is guaranteed, the pulling force is strong and it is not easy to fall off. Compared with the rotor assembly pasted with glue, it reduces the glue and curing process, and the concentricity is better. The rotor is a plurality of pairs of poles with a high magnetic field strength, and the worm and the metal shaft are fixed by a limit block, and the metal shaft and the limit block are interference fit; the housing assembly of the utility model is welded together after the housing, spring sheet, and tail cover are assembled by precision positioning tooling, and a grounding pin is made on the tail cover for easy grounding; the total coil assembly of the utility model is assembled into one by plastic holes and plastic columns to assemble the upper coil assembly, the middle coil assembly, and the lower coil assembly up and down into one, which is more convenient than assembly with bolts and has higher coaxiality. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional appearance structure of the utility model;

[0014] Figure 2 It is a three-dimensional cross-sectional structural schematic diagram of the utility model;

[0015] Figure 3 It is a schematic diagram of the partial explosion structure of the utility model;

[0016] Figure 4 This is a schematic diagram of the exploded structure of the casing assembly of the utility model;

[0017] Figure 5 This is a schematic diagram of the exploded structure of the magnet rotor assembly of the utility model;

[0018] Figure 6 This is a schematic diagram of the explosion structure of the total coil combination of the utility model;

[0019] Figure 7It is a schematic diagram of the claw-type stator sheet arrangement structure of the utility model.

[0020] In the figure: 1. Housing assembly; 11. Outer housing; 12. Rear bushing; 13. Shrapnel; 14. Tail end cover; 141. Ground pin; 2. Magnet rotor assembly; 21. Metal shaft; 22. Rotor; 23. Worm; 24. Limit block; 3. Total coil assembly; 31. Upper coil assembly; 32. Middle coil assembly; 33. Lower coil assembly; 301. Plastic column; 302. Plastic hole; 303. PIN needle; 4. Fixing part; 5. Forearm bracket; 51. Front bushing. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] The utility model provides a three-phase claw-pole micro-stepping motor with a structure as follows Figure 1 as well as Figure 4 As shown, it includes a casing assembly 1, which is composed of an outer casing 11, a rear shaft sleeve 12, a spring 13 and a tail end cover 14. The bottom end of the outer casing 11 is welded with a spring 13, and the bottom end of the spring 13 is welded with a tail end cover 14. The rear shaft sleeve 12 is arranged at the center position of the bottom of the casing assembly 1, and the bottom end of the rear shaft sleeve 12 passes through the spring 13 and extends to the inside of the tail end cover 14. The surface of the tail end cover 14 is also provided with a grounding pin 141, which is used for grounding.

[0023] During implementation, the housing assembly 1 is assembled by precision positioning tooling and then welded together with the housing, the spring sheet 13 and the tail cover 14. In addition, a grounding pin 141 is provided on the tail cover 14 for easy grounding.

[0024] Furthermore, if Figure 2 as well as Figure 6 As shown, the interior of the outer housing 11 is connected to a total coil assembly 3, and the total coil assembly 3 is composed of an upper coil component 31, a middle coil component 32 and a lower coil component 33. The upper coil component 31, the middle coil component 32 and the lower coil component 33 are assembled from top to bottom in an integrated manner. The surfaces of the upper coil component 31, the middle coil component 32 and the lower coil component 33 are respectively integrally injection-molded with plastic columns 301 and plastic holes 302, and when the total coil assembly 3 is assembled, the plastic columns 301 and the plastic holes 302 cooperate with each other so that the upper coil component 31, the middle coil component 32 and the lower coil component 33 are assembled into one body from top to bottom. The surfaces of the upper coil component 31, the middle coil component 32 and the lower coil component 33 are all spot-welded with PIN needles 303, and the other ends of the PIN needles 303 pass through the fixing member 4.

[0025] The coil assembly of the utility model is composed of two claw-type stator sheets placed opposite to each other, a frame located between the two stator sheets, and a coil wound on the frame, wherein the two claw-type stator sheets and a frame are embedded as a whole through an injection mold, and after the coil is wound, a PIN needle is inserted and the winding is spot welded.

[0026] Furthermore, if Figure 3 as well as Figure 5 As shown, the top of the upper coil assembly 31 is fixed with a forearm bracket 5 by bolts, and a front shaft sleeve 51 is installed on the top of the forearm bracket 5, a fixing part 4 is fixed with bolts on the outer wall of the outer casing 11, and a magnet rotor assembly 2 is installed on the inner side of the total coil assembly 3, the magnet rotor assembly 2 includes a metal shaft 21, a rotor 22, a worm 23 and a limit block 24, the metal shaft 21 is arranged inside the outer casing 11, and the upper and lower ends of the metal shaft 21 are respectively inserted into the front shaft sleeve 51 and the rear shaft sleeve 12, the surface of the metal shaft 21 is integrally injection-molded with the rotor 22, and the surface of the metal shaft 21 is located above the rotor 22 and is sleeved with a worm 23, the surface of the top of the metal shaft 21 is interference fit with a limit block 24, and the limit block 24 is used for limiting and fixing the worm 23 after installation.

[0027] During implementation, the rotor 22 and the metal shaft 21 of the utility model are integrally injection molded, the coaxiality is guaranteed, the pulling force is strong and it is not easy to fall off. Compared with the rotor assembly glued together, the glue and curing process are reduced, and the concentricity is better. The rotor 22 has multiple pairs of magnetic poles and a high magnetic field strength, and the worm 23 and the metal shaft 21 are fixed by the limit block 24, and the metal shaft 21 and the limit block 24 are interference fit.

[0028] The claw-type stator sheets of the three-phase motor of the utility model are arranged as follows: Figure 7 As shown, the rotor pole pair number pitch τ of the motor, the phase difference between poles A1 and A2, poles B1 and B2, poles C1 and C2 is τ / 2, and the phase difference between poles A1, B1 and C1 is τ / 3. Therefore, the phase difference between adjacent phase poles A2 and B1, and poles B2 and C1 is τ / 6. Similarly, the rotor pole pair number pitch τ of the two-phase motor is obtained, the phase difference between poles A1 and A2, B1 and B2 is τ / 2, A1 and B1 are τ / 4, and the adjacent phases A2 and B1 are τ / 4. Therefore, the phase difference between adjacent phases is τ / 6 for three-phase and τ / 4 for two-phase. It can be concluded that under the same magnetic pole condition, the resolution of the three-phase motor is 1.5 times higher than that of the two-phase motor, thereby reducing motor vibration, reducing motor noise, and improving product performance.

[0029] Working principle: The rotor 22 and the metal shaft 21 of the utility model are integrally injection molded, the coaxiality is guaranteed, the pulling force is strong and it is not easy to fall off. Compared with the rotor assembly glued together, it reduces the glue and curing process, and the concentricity is better. The rotor 22 has multiple pairs of magnetic poles and a high magnetic field strength, and the worm 23 and the metal shaft 21 are fixed by a limit block 24, and the metal shaft 21 and the limit block 24 are interference fit.

[0030] The housing assembly 1 of the utility model is composed of a housing, a spring sheet 13 and a tail cover 14 which are assembled and welded into one body by a precision positioning tool, and a grounding pin 141 is provided on the tail cover 14 for easy grounding.

[0031] The total coil assembly 3 of the utility model is a top coil assembly 31, a middle coil assembly 32 and a bottom coil assembly 33 assembled into one piece by a plastic hole 302 and a plastic column 301, which is more convenient than assembly with bolts and has a higher coaxiality.

[0032] It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention.

Claims

1. A three-phase claw-pole micro-stepping motor, comprising a housing assembly (1), characterized in that: The housing assembly (1) is composed of an outer housing (11), a rear shaft sleeve (12), a spring sheet (13) and a tail end cover (14); the bottom end of the outer housing (11) is welded with a spring sheet (13), and the bottom end of the spring sheet (13) is welded with a tail end cover (14); the interior of the outer housing (11) is connected with a main coil assembly (3), and the main coil assembly (3) is composed of an upper coil assembly (31), a middle coil assembly (32) and a lower coil assembly (33); the upper coil assembly (31), the middle coil assembly (32) and the lower coil assembly (33) are integrally assembled from top to bottom; a fixing member (4) is fixed to the outer wall of the outer housing (11) by bolts; and a magnet rotor assembly (2) is installed on the inner side of the main coil assembly (3).

2. A three-phase claw-pole micro-stepping motor according to claim 1, characterized in that: A rear shaft sleeve (12) is arranged at the center position of the bottom of the housing assembly (1), and the bottom end of the rear shaft sleeve (12) penetrates the spring sheet (13) and extends to the inside of the tail end cover (14). A grounding pin (141) is also arranged on the surface of the tail end cover (14), and the grounding pin (141) is used for grounding.

3. The three-phase claw-pole micro-stepping motor according to claim 1, characterized in that: The top end of the upper coil assembly (31) is fixed with a forearm bracket (5) via bolts, and the top end of the forearm bracket (5) is installed with a front shaft sleeve (51).

4. The three-phase claw-pole micro-stepping motor according to claim 1, characterized in that: The magnet rotor assembly (2) comprises a metal shaft (21), a rotor (22), a worm (23) and a stop block (24); the metal shaft (21) is arranged inside the outer casing (11), and the upper and lower ends of the metal shaft (21) are respectively inserted into the interior of the front shaft sleeve (51) and the rear shaft sleeve (12).

5. A three-phase claw-pole micro-stepping motor according to claim 4, characterized in that: The surface of the metal shaft (21) is integrally molded with a rotor (22), and a worm (23) is sleeved on the surface of the metal shaft (21) above the rotor (22), and a limit block (24) is interference-fitted on the surface of the top of the metal shaft (21), and the limit block (24) is used for limiting and fixing the worm (23) after installation.

6. The three-phase claw-pole micro-stepping motor according to claim 1, characterized in that: The surfaces of the upper coil assembly (31), the middle coil assembly (32) and the lower coil assembly (33) are respectively integrally injection-molded with plastic columns (301) and plastic holes (302), and when the overall coil assembly (3) is assembled, the plastic columns (301) and the plastic holes (302) cooperate with each other so that the upper coil assembly (31), the middle coil assembly (32) and the lower coil assembly (33) are assembled into one piece.

7. The three-phase claw-pole micro-stepping motor according to claim 1, characterized in that: PIN needles (303) are spot-welded on the surfaces of the upper coil assembly (31), the middle coil assembly (32) and the lower coil assembly (33), and the other end of the PIN needle (303) passes through the fixing piece (4).

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