A high-efficiency spindle servo motor with overload protection function

Abstract

This invention discloses a high-efficiency spindle servo motor with overload protection, relating to the field of spindle servo motor technology. It includes a motor body and a junction box located on top of the motor body. A fixed base is mounted on the drive end of the motor body, and a drive shaft is located at the outer end of the fixed base. A conductive base is located on one side of the junction box, and an overload protector electrically connected to the conductive base is located on the other side of the junction box. A terminal block is located at the front end of the other side of the junction box, and a protective mechanism is located inside the mounting cavity. This invention, through the cooperation of the overload protector, the protective mechanism, and the drive shaft, facilitates automatic tripping and disconnection of the power supply to the motor body when encountering excessive external power supply voltage. This effectively prevents motor overload due to excessive voltage, and can shunt the high-voltage current connected to the motor body, effectively improving overload protection during motor use and extending the motor's service life.

Description

Technical Field

[0001] This invention relates to the field of spindle servo motor technology, and in particular to a high-efficiency spindle servo motor with overload protection function. Background Technology

[0002] An electric motor is an electromechanical product that converts electrical energy into rotational mechanical energy. During use, motors are generally in normal operating condition. However, overload can occur due to various reasons, such as excessively high motor voltage, excessive torque on the motor shaft, or excessive load. This is especially true for high-efficiency spindle servo motors, where voltage overload can damage not only the electrical components inside the junction box but also the internal circuitry of the motor itself. Furthermore, when the power supply to a servo motor suddenly stops, the rotating motor shaft also stops immediately, but the connected rotating object does not stop immediately. This causes the still-rotating load to exert a large torque on the locked motor shaft, leading to overload. This damages the rotor connected to the motor shaft, affecting the motor's normal operation upon restart and shortening its lifespan. Therefore, improvements are needed to address these issues. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a high-efficiency spindle servo motor with overload protection.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a high-efficiency spindle servo motor with overload protection function, comprising a motor body and a junction box located on the top of the motor body. A fixed base is mounted on the drive end of the motor body, and a transmission shaft is laterally rotatable on the outer end face of the fixed base. Multiple stuffing boxes are equidistantly connected on one outer wall of the junction box. A conductive base is located on one side of the inside of the junction box, and a terminal block is mounted on one top end of the conductive base. An overload protector electrically connected to the conductive base is located on the other side of the inside of the junction box. A terminal block is located at the front end of the other side of the inside of the junction box, and the terminal block is connected to the circuitry inside the motor body. An installation cavity is opened inside the fixed base, and a protective mechanism for overload protection between the motor shaft and the transmission shaft is located inside the installation cavity.

[0005] Preferably, the protective mechanism includes a connecting seat fixedly sleeved on the motor shaft of the motor body, a stabilizing seat fixedly installed on the inner wall of the outer end of the mounting cavity, a circular opening in the middle of the inner end face of the stabilizing seat, a movable ring plate slidably disposed inside the circular opening, and a rotating ring movably disposed in the inner ring of the movable ring plate. A spline shaft is laterally rotatably disposed in the inner ring of the rotating ring. An annular cavity is opened inside the outer side of the stabilizing seat, and a repulsive force component for moving the movable ring plate is disposed inside the annular cavity. A connecting platform protrudes from the outer end face of the connecting seat, and a spline groove is opened in the middle of the platform surface. The inner end of the spline shaft is inserted into the spline groove. The inner end of the transmission shaft extends movably into the circular opening, and a spline hole groove that mates with the spline shaft is opened on the inner end face of the transmission shaft.

[0006] Preferably, both ends of the circular opening are wide-mouthed, and the connecting platform is inserted into the wide-mouth of the outer end of the circular opening and is rotatably connected to the stabilizing seat through a bearing ring; a transmission sleeve is rotatably provided between the moving ring plate and the rotating ring, one end of the transmission sleeve is a necked tube structure, an annular groove is opened on the outer side of the inner end face of the connecting platform, and multiple limiting grooves are opened on the inner wall of the annular groove; multiple limiting blocks are equidistantly protruding on the outer wall of the necked end of the transmission sleeve, which are inserted into the limiting grooves; the wide-neck end of the transmission sleeve is sleeved on the outer wall of the inner end of the transmission shaft, and multiple locking strips are equidistantly protruding on the outer wall of the inner end of the transmission shaft, and multiple locking grooves that cooperate with the locking strips are equidistantly opened on the circumference of the inner wall of the wide-neck end of the transmission sleeve.

[0007] Preferably, the repulsive force assembly includes an electromagnet ring fixedly disposed on one inner wall of the annular cavity, a magnet ring vertically movably abutting against the inner side of the annular cavity of the electromagnet ring, stabilizing rods equidistantly fixed to the upper and lower ends of the inner wall of the other side of the annular cavity, and a plurality of thrust springs disposed on the other side of the magnet ring; the magnetic poles of the electromagnet ring and the magnet ring are the same on opposite sides; the outer ends of the thrust springs are fixedly connected to the inner wall of the other side of the annular cavity; connecting rods are fixedly connected to the inner ring wall of the magnet ring; a plurality of rectangular slots communicating with the annular cavity are equidistantly opened on the periphery of the inner wall of the central part of the circular opening; the inner ends of the connecting rods extend from the rectangular slots into the circular opening and are fixedly connected to the outer wall of the movable ring plate.

[0008] Preferably, the electromagnet ring has a power supply wire at its energizing end, and the outer end of the power supply wire is electrically connected to the energizing end of the overload protector.

[0009] Preferably, a limiting ring plate is vertically provided on one side of the inner wall of the constricted neck section in the middle of the circular opening, and multiple guide rods are provided at equal intervals on the outer end face of the limiting ring plate, and the guide rods movably pass through the moving ring plate.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention, through the cooperation of the overload protector, the protective mechanism, and the transmission shaft, facilitates automatic tripping and disconnection of the power supply to the motor body when encountering excessive external power supply voltage. This effectively prevents the motor body from overloading due to excessive voltage. Furthermore, after a sudden power failure, it automatically disconnects the transmission between the suddenly self-locking motor shaft and any rotating external object. It also provides load balancing for higher voltage currents connected to the motor body, preventing damage to internal electrical components in the junction box caused by voltage fluctuations after a power failure. This effectively improves overload protection for the motor body during use and extends the motor's service life. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0012] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0013] Figure 2 This is a top view of the structure of the present invention;

[0014] Figure 3 This is a top sectional view of the junction box of the present invention;

[0015] Figure 4 This is a top sectional view of the junction box and mounting base of the present invention;

[0016] Figure 5 This is a top sectional view of the connector and stabilizing seat of the present invention;

[0017] The components in the diagram are numbered as follows: 1. Motor body; 2. Junction box; 3. Stuffing box; 4. Mounting base; 5. Drive shaft; 6. Conductive base; 7. Terminal block; 8. Overload protector; 9. Power transmission line; 10. Terminal block; 11. Connecting base; 12. Stabilizer; 13. Moving ring plate; 14. Rotating ring; 15. Splined shaft; 16. Electromagnetic ring; 17. Magnet ring; 18. Transmission sleeve; 19. Thrust spring; 20. Stabilizer bar. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0019] Example: See Figures 1 to 5A high-efficiency spindle servo motor with overload protection function includes a motor body 1 and a junction box 2 located on top of the motor body 1. A fixed base 4 is mounted on the drive end of the motor body 1, and a transmission shaft 5 is laterally rotatable on the outer end face of the fixed base 4. Multiple stuffing boxes 3 are equidistantly connected on one side of the outer wall of the junction box 2. A conductive seat 6 is provided on one side of the inside of the junction box 2, and a terminal block 7 is mounted on one top end of the conductive seat 6. An overload protector 8 electrically connected to the conductive seat 6 is provided on the other side of the inside of the junction box 2. A terminal block 10 is provided at the front end of the other side of the inside of the junction box 2, and the terminal block 10 is connected to the circuit inside the motor body 1. A mounting cavity is opened inside the fixed base 4, and a protective mechanism for overload protection between the motor shaft and the transmission shaft 5 is provided inside the mounting cavity. Through the cooperation of the overload protector 8, the protective mechanism, and the transmission shaft 5, the power supply to the motor body 1 can be automatically tripped and disconnected when the external power supply voltage is too high. This effectively prevents the motor body 1 from being overloaded due to excessive voltage. Furthermore, after a sudden power failure of the motor body 1, the transmission between the suddenly self-locked motor shaft and the rotating external object can be automatically disconnected. It can also shunt the high-voltage current connected to the motor body 1, preventing damage to the electrical components inside the junction box 2 due to voltage fluctuations after a power failure. This effectively improves the overload protection effect of the motor body 1 during use and extends the service life of the motor.

[0020] In this invention, the protective mechanism includes a connecting seat 11 fixedly sleeved on the motor shaft of the motor body 1, a stabilizing seat 12 fixedly installed on the inner wall of the outer end of the mounting cavity, a circular opening in the middle of the inner end face of the stabilizing seat 12, a movable ring plate 13 slidably disposed inside the circular opening, and a rotating ring 14 movably disposed in the inner ring of the movable ring plate 13. A spline shaft 15 is laterally rotatably disposed in the inner ring of the rotating ring 14. An annular cavity is opened inside the outer side of the stabilizing seat 12, and a repulsive force component for moving the movable ring plate 13 is disposed inside the annular cavity. A connecting platform protrudes from the outer end face of the connecting seat 11, and a spline groove is opened in the middle of the platform. The inner end of the spline shaft 15 is inserted into the spline groove. The inner end of the transmission shaft 5 extends movably into the interior of the circular opening, and a spline hole groove that mates with the spline shaft 15 is opened on the inner end face of the transmission shaft 5. A limiting ring plate is vertically disposed on one side of the necked section in the middle of the circular opening, and multiple guide rods are equidistantly disposed on the outer end face of the limiting ring plate. The guide rods movably pass through the movable ring plate 13.

[0021] In this invention, both ends of the circular opening are wide-mouthed. The connecting platform is inserted into the wide-mouthed part of the outer end of the circular opening and is rotatably connected to the stabilizing seat 12 through a bearing ring. A transmission sleeve 18 is rotatably provided between the moving ring plate 13 and the rotating ring 14. One end of the transmission sleeve 18 is a constricted tube structure. An annular groove is opened on the outer side of the inner end face of the connecting platform. Multiple limiting grooves are opened on the inner wall of the annular groove. Multiple limiting blocks that insert into the limiting grooves are equidistantly protruding on the outer wall of the constricted end of the transmission sleeve 18. The wide-necked end of the transmission sleeve 18 is sleeved on the outer wall of the inner end of the transmission shaft 5. Multiple locking strips are equidistantly protruding on the outer wall of the inner end of the transmission shaft 5. Multiple locking grooves that cooperate with the locking strips are equidistantly opened on the circumference of the inner wall of the wide-necked end of the transmission sleeve 18. The transmission sleeve 18 can enhance the torque force when the spline shaft 15 transmits power to the transmission shaft 5. It also improves the connection strength between the motor shaft and the transmission shaft 5 during transmission and the overload protection effect of the motor shaft.

[0022] In this invention, the repulsion assembly includes an electromagnet ring 16 fixedly disposed on one inner wall of the annular cavity, a magnet ring 17 vertically movably abutting against the inner side of the annular cavity of the electromagnet ring 16, stabilizing rods 20 equidistantly and laterally fixed to the upper and lower ends of the inner wall of the other side of the annular cavity, and a plurality of thrust springs 19 disposed on the other side of the magnet ring 17; the magnetic poles of the electromagnet ring 16 and the magnet ring 17 are the same on opposite sides; the energized end of the electromagnet ring 16 is provided with a power transmission line 9, the outer end of which is electrically connected to the energized end of the overload protector 8; the outer end of the thrust spring 19 is fixedly connected to the inner wall of the other side of the annular cavity; the magnet ring... Connecting rods are fixed to the inner wall of the 17 ring. Multiple rectangular slots communicating with the annular cavity are equidistantly opened on the circumference of the inner wall of the circular opening. The inner end of the connecting rod extends from the rectangular slot into the circular opening and is fixed to the outer wall of the movable ring plate 13. With the setting of the thrust spring 19, when the electromagnet ring 16 is not energized, the magnet ring 17 can be pushed to automatically return to its original position, thereby driving the movable ring plate 13 to drive the transmission sleeve 18 and spline shaft 15 to reset and move, so that when the motor body 1 starts again, the transmission sleeve 18 and spline shaft 15 will continue to drive the transmission shaft 5 to rotate through the returned transmission sleeve 18 and spline shaft 15.

[0023] Working principle: In this embodiment, the present invention also proposes a method for using a high-efficiency spindle servo motor with overload protection function, including the following steps:

[0024] Step 1: First, install the conductive base 6, terminal block 7, overload protector 8, and power transmission line 9 on the junction box 2. Pass the external wire through the stuffing box 3 into the junction box 2 and make a fixed electrical connection between the external wire and terminal block 7. Next, install the fixed base 4 with the drive shaft 5 and protective structure on the drive end of the motor body 1, and fix the connecting seat 11 in the protective mechanism to the motor shaft of the motor body 1. When the motor body 1 rotates, it can drive the motor shaft to rotate the connecting seat 11. The rotation of the connecting seat 11 can drive the spline shaft 15 to rotate, which in turn drives the drive shaft 5 to rotate, thereby driving the object to be driven by the drive shaft 5 to rotate. By setting the transmission sleeve 18, the torque force can be enhanced when the spline shaft 15 drives the drive shaft 5. Furthermore, it improves the connection strength between the motor shaft and the drive shaft 5 during transmission and enhances the overload protection effect of the motor shaft.

[0025] Step 2: If the current supplied to the motor body 1 is too large, the overload protector 8 inside the junction box 2 will trip, thereby protecting the circuit inside the motor body 1 from voltage overload. Since the motor body 1 stops receiving power, the motor rotor will quickly stop rotating.

[0026] Step 3: After the power supply to the motor body 1 is stopped, since the external wires are still electrically connected to the electrical components inside the junction box 2, in order to avoid leakage and fire due to excessive voltage, the overload protector 8 will not supply power to the motor body 1. At this time, the power transmission line 9 connected to the power terminal of the overload protector 8 will supply a high voltage current to the electromagnet ring 16. The energized electromagnet ring 16 can quickly generate the same magnetic field as the magnet ring 17. Since the magnetic poles of the electromagnet ring 16 after being energized are the same as the magnetic poles of the magnet ring 17, it can push the magnet ring 17 to the other end of the annular cavity.

[0027] Step four: The movable magnet ring 17 facilitates the movement of the movable ring plate 13 within the circular opening toward the transmission shaft 5 via the connecting rod. The movement of the movable ring plate 13 facilitates the exit of one end of the splined shaft 15 from the spline groove of the connecting seat 11, thereby disconnecting the transmission between the transmission shaft 5 and the motor shaft. This prevents the rotating object from driving the transmission shaft 5, which is in a sudden power outage and self-locking state, thus avoiding rotor damage to the motor shaft of the motor body 1 due to large shaft load and large torque during emergency stops.

[0028] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-efficiency spindle servo motor with anti-overload function, comprising a motor body (1) and a terminal box (2) arranged on the top of the motor body (1), characterized in that: The driving end of the motor body (1) is provided with a fixed seat (4), the outer end surface of the fixed seat (4) is provided with a transmission shaft (5) which rotates laterally, a plurality of packing boxes (3) are provided on the outer wall of one side of the junction box (2) and are communicated equidistantly, a conductive seat (6) is provided on one side in the junction box (2), a wiring terminal (7) is provided on the top end of the conductive seat (6), an overload protector (8) which is electrically connected with the conductive seat (6) is provided on the other side in the junction box (2), a wiring seat (10) is provided on the other side in the junction box (2) and is in front of the other side, the wiring seat (10) is connected with the circuit in the motor body (1), an installation cavity is formed in the fixed seat (4), a protection mechanism for the overload protection between the motor shaft and the transmission shaft (5) is provided in the installation cavity, the protection mechanism comprises a connecting seat (11) which is fixedly sleeved on the motor shaft of the motor body (1), a stabilizing seat (12) which is fixedly installed on the inner wall of the outer end of the installation cavity, a circular port which is formed in the middle of the inner end surface of the stabilizing seat (12), a moving ring plate (13) which is slidably provided in the circular port, and a rotating ring (14) which is movably provided in the inner ring of the moving ring plate (13), a spline shaft (15) is provided in the inner ring of the rotating ring (14) and rotates laterally, a ring cavity is formed in the inner side of the outer side of the stabilizing seat (12), a repulsion assembly for the movement of the moving ring plate (13) is provided in the ring cavity, a connecting table is protruded from the outer end surface of the connecting seat (11), a spline groove is formed in the middle of the table surface of the connecting table, and the inner end of the spline shaft (15) is inserted into the spline groove, the inner end of the transmission shaft (5) extends into the circular port, and a spline hole slot is formed in the inner end surface of the transmission shaft (5) and matches the spline shaft (15), the two ends of the circular port are wide-mouthed, the connecting table is inserted into the wide mouth of the outer end of the circular port and is rotatably connected with the stabilizing seat (12) through a bearing ring, a transmission sleeve (18) is rotatably provided between the moving ring plate (13) and the rotating ring (14), one end of the transmission sleeve (18) is a necked tube structure, a ring groove is formed in the inner end surface of the outer side of the connecting table, a plurality of limiting strip grooves are formed in the inner wall of the ring groove, a plurality of limiting strip blocks which are inserted into the limiting strip grooves are protruded equidistantly from the outer wall of the necked end of the transmission sleeve (18), the transmission sleeve (18) is sleeved on the inner end outer wall of the transmission shaft (5), a plurality of clamping strips are protruded equidistantly from the outer wall of the inner end of the transmission shaft (5), a plurality of clamping grooves which match the clamping strips are formed equidistantly in the inner wall of the wide neck end of the transmission sleeve (18).

2. The high-efficiency spindle servo motor with anti-overload function according to claim 1, characterized in that: The repulsion assembly comprises an electromagnet ring (16) fixed on the inner wall of one side of the annular cavity, a magnet ring (17) vertically movably abutting against the inner side of the electromagnet ring (16), a stabilizing rod (20) equidistantly and transversely fixed on the upper and lower ends of the inner wall of the other side of the annular cavity, and a plurality of thrust springs (19) arranged on the other side of the magnet ring (17); the opposite faces of the electromagnet ring (16) and the magnet ring (17) have the same magnetic poles; the outer ends of the thrust springs (19) are fixed to the inner wall of the other side of the annular cavity; the inner wall of the inner ring of the magnet ring (17) is fixed with a connecting rod, a plurality of rectangular slot openings communicating with the annular cavity are equidistantly arranged on the circumferential side of the inner wall of the middle part of the circular opening, and the inner end of the connecting rod extends into the circular opening from the rectangular slot opening and is fixed to the outer wall of the moving ring plate (13).

3. The high efficiency spindle servo motor with anti-overload function according to claim 2, characterized in that: The power connection end of the electromagnet ring (16) is provided with a power transmission line (9), and the outer end of the power transmission line (9) is electrically connected with the power connection end of the overload protector (8).

4. The high efficiency spindle servo motor with anti-overload function according to claim 1, characterized in that: A limiting ring plate is vertically arranged on one side of the inner wall of the necked section of the middle part of the circular opening, a plurality of guide rods are equidistantly arranged on the outer end face of the limiting ring plate, and the guide rods movably penetrate the moving ring plate (13).

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