A K-type fixed-shaft motor

Abstract

The utility model discloses a K type fixed axle motor relates to rotating electric machine technical field, including upper casing, the middle part threaded connection of upper casing has spline guide sleeve, the surface threaded connection of spline guide sleeve has and tight nut, the inside sliding connection of spline guide sleeve has spline shaft, one end of spline shaft is connected with the screw rod rotationally. The utility model discloses a spline shaft, screw rod, copper axle and the cooperation of flat pad, the axial length shortens 30%-50%, and the radial dimension reduces more than 20%; eliminate the shaft coupling, the clearance between external bearing, and the repeat positioning accuracy improves to plus or minus 10arc-sec; system parts quantity reduces 40%, and assembly man -hour reduces 50%, and cost drops more than 20%; fixed axle does structure piece, and torsional rigidity promotes 2-3 times, and hollow fixed axle can go line, go pipe, and simplify wiring, modular design, and the same fixed axle can match different outer diameter outer rotor, realizes serialization, supports a variety of bearing technology, and expands the application range (vacuum, high speed, super clean etc.

Description

Technical Field

[0001] This utility model relates to the field of rotary motor technology, specifically to a K-type fixed-axis motor. Background Technology

[0002] Stepper motors, capable of precise rotor positioning and direct load bearing through an integrated fixed shaft without relying on external nuts or additional support structures, are suitable for applications with high requirements for spatial dimensions, positioning accuracy, and rigidity, such as robot joints, optical instrument platforms, 3D printers, precision slides, and medical equipment. Existing stepper motors generally use a rotary shaft output, requiring external accessories such as nuts, couplings, and support seats to connect to the load. This results in: long axial / radial dimensional chains and large overall volume; bearing clearances and flexible coupling links introducing backlash errors, reducing positioning accuracy; numerous parts, complex assembly, and high cost; and large system inertia during high-speed start-stop, limiting dynamic response. Although "hollow shaft stepper motors" with hollow rotors have emerged, they still require external bearings to fix the hollow shaft, and the hollow structure weakens torsional stiffness. Therefore, the industry urgently needs a more compact, higher-precision stepper motor that can directly bear loads.

[0003] Patent publication number CN220254272U discloses a stepper motor, including a housing with a defined cavity inside, and a mounting port communicating with the cavity on one side of the housing; a wire guard box located at the mounting port, with a square groove communicating with the cavity; a coil assembly located in the cavity and connected to the wire guard box, the coil assembly including a coil body and a connecting pin, the connecting pin being connected to the coil body, one end of the connecting pin passing through the square groove, and the other end of the connecting pin cooperating with the wire guard box to close the square groove; and a connecting lead wire connected to one end of the connecting pin.

[0004] To address the difficulty of repairing damaged motors, existing technology uses a junction box and housing connected by connecting pins and leads to connect the coil assembly to other structures within the motor. However, this approach still results in issues such as the large overall size of traditional motors, reduced load accuracy when connecting to external devices, complex and costly assembly, and large system inertia during high-speed start-stop. Consequently, stepper motors are gradually facing obsolescence or being replaced by other types of motors. Utility Model Content

[0005] The purpose of this invention is to provide a K-type fixed-shaft motor to solve the problems mentioned in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A K-type fixed-shaft motor includes an upper housing, a splined guide sleeve threadedly connected to the middle of the upper housing, and a tightening nut threadedly connected to the surface of the splined guide sleeve.

[0008] The spline guide sleeve is internally slidably connected to a spline shaft, one end of which is rotatably connected to a lead screw, and the surface of the lead screw is threaded with a copper shaft.

[0009] A further improvement of this utility model is that a permanent magnet rotor is fixedly connected to the surface of the copper shaft, and a first bearing is fixedly connected to one end of the copper shaft.

[0010] A further improvement of this utility model is that: the outer ring of the first bearing is fixedly connected to the lower housing, and the other end of the copper shaft is fixedly connected to the second bearing.

[0011] A further improvement of this utility model is that: the outer ring of the second bearing is fixedly connected to the upper housing, and a flat washer is movably connected between the second bearing and the spline guide sleeve.

[0012] A further improvement of this utility model is that: a groove is provided on the surface of the spline shaft, an open retaining ring is engaged inside the groove, the surface of the open retaining ring is movably connected to the inner top end of the spline guide sleeve, and the surface of the open retaining ring is movably connected to the surface of the second bearing.

[0013] A further improvement of this utility model is that a stator housing is provided between the upper housing and the lower housing, and the upper housing, the lower housing and the stator housing are fixedly connected by long screws.

[0014] A further improvement of this utility model is that: a stator winding frame is fixedly connected inside the stator housing, a wire is fixedly connected to one side of the stator winding frame, the wire is electrically connected to the winding, and laminations are fixedly connected inside the permanent magnet rotor.

[0015] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0016] 1. This utility model provides a K-type fixed shaft motor, which, by using a splined shaft, lead screw, copper shaft, splined guide sleeve and flat washer, shortens the axial length by 30%-50% and reduces the radial dimension by more than 20%; eliminates the gaps in the coupling and external bearing, and improves the repeatability accuracy to ±10 arc-sec; reduces the number of system parts by 40%, reduces assembly time by 50%, and reduces costs by more than 20%; the fixed shaft also serves as a structural component, and the torsional rigidity is increased by 2-3 times.

[0017] 2. This utility model provides a K-type fixed shaft motor. By using a splined shaft, lead screw, copper shaft, open retaining ring, first bearing and second bearing, the hollow fixed shaft can be used for wiring and tubing, simplifying wiring; the modular design allows the same fixed shaft to be matched with rotors of different outer diameters, realizing serialization; it supports multiple bearing technologies, expanding the application range (vacuum, high speed, ultra-clean, etc.). Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0019] Figure 2 This is an exploded view of the structure of this utility model;

[0020] Figure 3 This is an exploded view of the internal structure of this utility model;

[0021] Figure 4 This is an exploded view showing the internal structure details of this utility model;

[0022] Figure 5 This is an exploded view of the internal structure of this utility model from another perspective;

[0023] Figure 6 This is a schematic diagram showing the internal structure of the present invention from another perspective;

[0024] Figure 7 This is a three-dimensional structural diagram of point A of this utility model.

[0025] In the diagram: 1. Upper housing; 2. Lower housing; 3. Stator housing; 4. Splined shaft; 5. Lead screw; 6. Stator winding frame; 7. Permanent magnet rotor; 8. First bearing; 9. Second bearing; 10. Copper shaft; 11. Splined guide sleeve; 12. Tightening nut; 13. Flat washer; 14. Open retaining ring; 15. Laminated laminations; 16. Wire. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to embodiments:

[0027] Example 1

[0028] like Figure 1-5As shown, this utility model provides a K-type fixed shaft motor, including an upper housing 1. A spline guide sleeve 11 is threadedly connected to the middle of the upper housing 1. A tightening nut 12 is threadedly connected to the surface of the spline guide sleeve 11. A spline shaft 4 is slidably connected inside the spline guide sleeve 11. A lead screw 5 is rotatably connected to one end of the spline shaft 4. A copper shaft 10 is threadedly connected to the surface of the lead screw 5. A permanent magnet rotor 7 is fixedly connected to the surface of the copper shaft 10. A first bearing 8 is fixedly connected to one end of the copper shaft 10. A lower housing 2 is fixedly connected to the outer ring of the first bearing 8. A second bearing 9 is fixedly connected to the other end of the copper shaft 10. The upper housing 1 is fixedly connected to the outer ring of the second bearing 9.

[0029] In this embodiment, the general working principle of a stepper motor is to convert electrical pulse signals into corresponding angular or linear displacements. Each input pulse signal causes the rotor to rotate by a specific angle. Its basic working principle is as follows: Current generates a magnetic field: When a given phase is energized, the current in the coil generates a magnetic field, and the rotor aligns with this magnetic field; Pulse control: By controlling the sequence, frequency, and number of electrical pulses applied to the motor coils, the direction, speed, and rotation angle of the stepper motor can be controlled; Stepping process: By sequentially applying voltage to different phases, the rotor will rotate by a specific angle and eventually reach the desired position; In this application... A new technical solution is proposed. The device has reserved cooling channels, wiring holes and encoder mounting positions. The drive board can be integrated into the tail of the motor or externally placed. Power supply and signal transmission are realized through wiring inside the fixed shaft. After the device is started, the magnetic field direction of the winding is continuously switched by controlling the winding current in sequence, thereby driving the permanent magnet rotor 7 to rotate. The surface of the copper shaft 10 passes through the first bearing 8, the permanent magnet rotor 7 and the second bearing 9, and the copper shaft 10 also rotates. The copper shaft 10 has injection-molded threads and threaded connections with the lead screw 5, which drives the lead screw 5 to rotate and translate axially. The end of the lead screw 5 will push or pull the spline shaft 4 to translate axially.

[0030] Example 2

[0031] like Figure 1-5 As shown, based on Embodiment 1, this utility model provides a technical solution: Preferably, a flat washer 13 is movably connected between the second bearing 9 and the spline guide sleeve 11, a groove is provided on the surface of the spline shaft 4, an open retaining ring 14 is snapped into the groove, the surface of the open retaining ring 14 is movably connected to the inner top of the spline guide sleeve 11, the surface of the open retaining ring 14 is movably connected to the surface of the second bearing 9, a stator housing 3 is provided between the upper housing 1 and the lower housing 2, the upper housing 1, the lower housing 2 and the stator housing 3 are fixedly connected by long screws, a stator winding frame 6 is fixedly connected inside the stator housing 3, a wire 16 is fixedly connected to one side of the stator winding frame 6, the wire 16 is electrically connected to the winding, and a lamination 15 is fixedly connected inside the permanent magnet rotor 7.

[0032] In this embodiment, the lead screw 5 is rotatably connected to the spline shaft 4 and passes through the copper shaft 10. The open retaining ring 14 is installed on the spline shaft 4 as a hard limit for the lowest and highest points when the spline shaft 4 moves. The spline guide sleeve 11 has an injection-molded spline cavity inside that cooperates with the spline shaft 4 to fix the spline shaft 4 to be concentric and to move back and forth axially. The external thread of the spline guide sleeve 11 is screwed to the internal thread of the upper housing 1 and presses the permanent magnet rotor 7 through the flat washer 13 to prevent the permanent magnet rotor 7 from moving axially inside the motor. The function of the tightening nut 12 is to prevent the threads from loosening.

[0033] The working principle of this K-type fixed-shaft motor will be explained in detail below.

[0034] like Figure 1-5 As shown, after the device is started, the magnetic field direction of the winding is continuously switched by controlling the on and off of the winding current in sequence, thereby driving the permanent magnet rotor 7 to rotate. The surface of the copper shaft 10 passes through the first bearing 8, the permanent magnet rotor 7 and the second bearing 9, and the copper shaft 10 also rotates accordingly. The copper shaft 10 has an injection-molded thread and a lead screw 5 threaded connection inside, which drives the lead screw 5 to rotate and translate axially. The end of the lead screw 5 will push or pull the spline shaft 4 to translate axially. The lead screw 5 is rotatably connected to the spline shaft 4 and passes through the copper shaft 10. The open retaining ring 14 is installed on the spline shaft 4 as a hard limit at the lowest and highest points when the spline shaft 4 translates. The spline guide sleeve 11 has an injection-molded spline cavity inside that cooperates with the spline shaft 4 to fix the spline shaft 4 to be concentric and to move back and forth axially. The external thread of the spline guide sleeve 11 is screwed to the internal thread of the upper housing 1 and presses the permanent magnet rotor 7 through the flat washer 13 to prevent the permanent magnet rotor 7 from moving axially inside the motor. The function of the tightening nut 12 is to prevent the thread from loosening.

[0035] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A K-type fixed shaft motor comprising an upper casing (1), characterized in that: The upper housing (1) is threadedly connected to a spline guide sleeve (11) in the middle, and a tightening nut (12) is threadedly connected to the surface of the spline guide sleeve (11). The spline guide sleeve (11) is internally slidably connected to a spline shaft (4), and one end of the spline shaft (4) is rotatably connected to a lead screw (5). The surface of the lead screw (5) is threadedly connected to a copper shaft (10).

2. A K-type fixed shaft motor according to claim 1, characterized in that: A permanent magnet rotor (7) is fixedly connected to the surface of the copper shaft (10), and a first bearing (8) is fixedly connected to one end of the copper shaft (10).

3. A K-type fixed shaft motor according to claim 2, characterized in that: The outer ring of the first bearing (8) is fixedly connected to the lower housing (2), and the other end of the copper shaft (10) is fixedly connected to the second bearing (9).

4. A K-type fixed shaft motor according to claim 3, characterized in that: The outer ring of the second bearing (9) is fixedly connected to the upper housing (1), and a flat washer (13) is movably connected between the second bearing (9) and the spline guide sleeve (11).

5. A K-type fixed shaft motor according to claim 4, characterized in that: The surface of the spline shaft (4) is provided with a groove, and an open retaining ring (14) is engaged inside the groove. The surface of the open retaining ring (14) is movably connected to the top of the inside of the spline guide sleeve (11), and the surface of the open retaining ring (14) is movably connected to the surface of the second bearing (9).

6. A K-type fixed shaft motor according to claim 2, characterized in that: A stator housing (3) is provided between the upper housing (1) and the lower housing (2), and the upper housing (1), the lower housing (2) and the stator housing (3) are fixedly connected by long screws.

7. A K-type fixed shaft motor according to claim 6, characterized in that: The stator housing (3) is fixedly connected to the inside of a stator winding frame (6), and a wire (16) is fixedly connected to one side of the stator winding frame (6). The wire (16) is electrically connected to the winding. The permanent magnet rotor (7) is fixedly connected to a lamination (15).

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