Highly reliable brake reset motor

Abstract

This invention discloses a motor with high-reliability brake reset, comprising a brake stator, a motor body, and a movable armature. The motor body includes a motor shaft and a brake disc. An electromagnetic brake, comprising an electromagnetic coil, is installed within the brake stator. The movable armature is positioned on the side of the electromagnetic coil facing the brake disc and is axially movable along the motor shaft. A friction layer is provided on the side of the movable armature facing the brake disc. A reset spring is provided around each circumference of the brake stator, and the brake stator has spring cavities. Each spring cavity contains an axial push block to form an adjustable bottom wall. This invention dynamically adjusts the pre-compression of the reset spring through the axial push blocks of the adjustable bottom wall. High pre-compression during braking ensures reliable brake engagement, while decompression before startup assists the movable armature in low-force reset. Automatic return to position upon power failure achieves high-reliability braking and reset switching.

Description

Technical Field

[0001] This invention relates to the field of motors with brakes, and more specifically to a motor with highly reliable brake reset. Background Technology

[0002] In industrial motor systems, electromagnetic brakes are widely used to achieve automatic braking safety protection in the event of power failure. Their basic structure includes a brake disc, a return spring, an electromagnetic coil, and a movable armature. When the coil is energized, it generates magnetic force, attracting the armature and overcoming the spring force, causing the brake disc to separate from the rotating parts of the motor, completing the reset (release state), allowing the motor to start normally. When power is lost, the spring pushes the armature to press against the brake disc, achieving braking.

[0003] However, the reset reliability of existing brakes highly depends on the stability of the electromagnetic force and the smoothness of mechanical movement. In actual operation, factors such as coil aging, power supply voltage fluctuations, and residual magnetism in the iron core often cause the armature to not fully travel to its destination, resulting in a false reset. That is, the control system mistakenly judges that it has been released, while the brake disc is still partially in contact with the rotating parts. If the motor starts at this time, it will cause operation with the brake engaged, leading to overheating, torque loss, bearing wear, and even damage to the transmission system, seriously threatening the safety and continuous operation capability of the equipment.

[0004] Therefore, there is a need for a motor with highly reliable brake reset to solve the problem of incomplete brake disc reset in existing technologies and improve operational reliability. Summary of the Invention

[0005] To address the problems existing in the prior art, a motor with high-reliability brake reset is provided. The pre-compression of the reset spring is dynamically adjusted by the axial push block of the adjustable bottom wall. High pre-compression during braking ensures reliable brake holding. Before starting, decompression assists the movable armature to reset with low suction force. Automatic return to position after power failure achieves high-reliability switching between braking and reset.

[0006] To address the problems of existing technologies, this invention provides a motor for highly reliable brake reset, comprising a brake stator and a motor body arranged opposite to each other. The motor body includes a motor shaft coaxially passing through the brake stator and a brake disc coaxially fixed on the motor shaft. The motor shaft is rotatably connected to the brake stator via bearings. An electromagnetic brake is provided inside the brake stator, comprising an electromagnetic coil embedded in the brake stator and a movable armature disposed on the side of the electromagnetic coil facing the brake disc and capable of moving axially along the motor shaft. A friction layer is provided, which is disposed opposite to the end face of the brake disc. A return spring is provided on each of the four sides of the brake stator. The brake stator has a spring cavity for accommodating each return spring. The spring cavity extends axially along the motor shaft. An axial push block is inserted into each spring cavity. The axial push block abuts against the end of the return spring away from the movable armature. The other end of the return spring abuts against the side of the movable armature away from the brake disc. The axial push block can move axially within the spring cavity, forming an adjustable bottom wall of the spring cavity for adjusting the pre-compression of the return spring.

[0007] Preferably, the axial push block and the inner wall of the corresponding spring cavity are in clearance fit, and a plurality of balls are arranged around the axial push block inside the spring cavity. The balls are in rolling contact with the outer periphery of the axial push block, and the end of the axial push block inserted into the spring cavity is a tapered end.

[0008] Preferably, the brake stator includes an inner stator and an outer stator arranged coaxially, the inner stator and the outer stator are fixedly connected by circumferentially distributed connecting bolts, the spring cavity is formed on the inner stator, and an annular cavity for accommodating the ball is formed between the opposite end faces of the inner stator and the outer stator.

[0009] Preferably, the inner stator has an axially extending sleeve portion at one end facing the brake disc, and the movable armature has an annular structure with its inner hole slidingly engaging with the outer peripheral surface of the sleeve portion to form an axial guide structure.

[0010] Preferably, the outer stator has an annular guide groove on the end face away from the inner stator that communicates with each spring cavity. An annular guide plate is provided in the annular guide groove, and the annular guide plate is fixedly connected to each axial push block to synchronously drive all axial push blocks to move.

[0011] Preferably, the outer stator is provided with a linear driver that is connected to the annular guide plate, and is provided with a mounting base for mounting the linear driver and an outer protective shell.

[0012] Preferably, the linear actuator is a worm motor, the worm motor having a screw extending axially along the motor shaft, and the annular guide plate having a threaded sleeve that is threadedly engaged with the screw.

[0013] Preferably, multiple worm motors are evenly arranged circumferentially on the outer stator to form a multi-point synchronous drive mechanism.

[0014] Preferably, the annular guide groove of the outer stator is embedded with a plurality of circumferentially spaced axial guide blocks, and a guide channel is formed between adjacent axial guide blocks. The threaded sleeve on the annular guide plate is slidably engaged in the corresponding guide channel to restrict the circumferential rotation of the threaded sleeve.

[0015] Preferably, each of the axial guide blocks is provided with a mounting hole that extends through the thickness direction, and a distance sensor is fixedly installed in the mounting hole. The detection end of the distance sensor faces the annular guide plate, and a sensing point is provided at a corresponding position on the annular guide plate.

[0016] The advantages of this application compared to the prior art are: 1. The present invention forms an adjustable bottom wall by using an axial pusher block that moves axially within the spring cavity. During braking, the axial pusher block moves forward, and the return spring is in the maximum pre-compression state, ensuring reliable brake holding.

[0017] Before startup, the axial push block retracts, increasing the spring cavity depth and reducing the pre-compression of the return spring. This lowers the clamping force on the movable armature, allowing the electromagnetic coil to fully engage and disengage the movable armature from the brake disc with lower suction force, thus avoiding false resets caused by voltage fluctuations, residual magnetism, or jamming. Upon power failure, the return spring automatically resets, and the axial push block synchronously returns to its original position, restoring high braking force and achieving automatic switching between braking and highly reliable reset.

[0018] 2. This invention achieves automatic centering and guiding by setting a tapered end at the front end of the axial push block, and arranges circumferentially distributed rolling balls between it and the spring cavity, converting sliding friction into rolling friction and reducing motion resistance. At the same time, the annular cavity formed by the inner and outer stators being fastened together limits the rolling balls radially and axially, preventing them from falling out.

[0019] In addition, the movable armature and the inner stator's sleeve portion form a sliding guide pair, which effectively constrains radial offset and tilt during axial movement, ensuring that the friction layer and brake disc are always in parallel contact, thereby improving operational stability and long-term repeatability positioning accuracy.

[0020] 3. This invention, through the cooperation of annular guide plate and annular guide groove, synchronously converts the rotational output of multiple worm gear motors into the axial linear motion of the annular guide plate via threaded pair, and links all axial push blocks to move in the same direction and at equal distances, thereby achieving unified adjustment of the pre-compression of the reset spring.

[0021] The worm gear motors, arranged circumferentially at multiple points, provide high torque, self-locking, and precise drive capabilities, ensuring synchronous axial push block movement and balanced force distribution. The anti-rotation constraints of the annular guide groove and threaded sleeve effectively prevent off-center loading and tilting, thereby ensuring high consistency and stability of the brake reset action. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a motor with a highly reliable brake reset according to the present invention, viewed from a first perspective.

[0023] Figure 2 This is a three-dimensional structural diagram of a motor with a highly reliable brake reset according to the present invention, viewed from a second perspective.

[0024] Figure 3 This is a three-dimensional exploded view of the motor for high-reliability brake reset according to the present invention, viewed from a second perspective.

[0025] Figure 4 This is a three-dimensional exploded view of a motor with a highly reliable brake reset according to the present invention, viewed from a first perspective.

[0026] Figure 5 This is an exploded three-dimensional structural diagram of the brake disc and movable armature of a motor with a highly reliable brake reset according to the present invention.

[0027] Figure 6 This is a partial three-dimensional structural cross-sectional view of a motor with a highly reliable brake reset according to the present invention.

[0028] Figure 7 yes Figure 6 Enlarged diagram of point A in the middle.

[0029] Figure 8 This is a partial planar sectional view of a motor with a highly reliable brake reset according to the present invention.

[0030] Figure 9 yes Figure 8 Enlarged diagram of point B in the middle.

[0031] Figure 10 This is a three-dimensional structural diagram of the axial guide block and annular guide plate of a motor for high-reliability brake reset according to the present invention.

[0032] Figure 11 This is an exploded three-dimensional structural diagram of the axial guide block and annular guide plate of a motor for high-reliability brake reset according to the present invention.

[0033] Figure 12 This is a three-dimensional cross-sectional view of the distance sensor and sensing point of a motor for high-reliability brake reset according to the present invention.

[0034] Figure 13 yes Figure 12 Enlarged diagram of point C in the middle.

[0035] The numbers in the diagram are as follows: 1. Brake stator; 11. Inner stator; 111. Spring cavity; 112. Ball bearing; 113. Sleeve joint; 12. Outer stator; 121. Annular guide groove; 1211. Axial guide block; 1212. Distance sensor; 1213. Sensing point; 122. Annular guide plate; 123. Mounting base; 124. Outer protective shell; 13. Connecting bolt; 2. Motor shaft; 3. Brake disc; 31. Bearing; 4. Electromagnetic coil; 5. Movable armature; 51. Friction layer; 6. Return spring; 7. Axial push block; 8. Worm motor; 81. Screw; 82. Threaded sleeve. Detailed Implementation

[0036] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0037] See Figures 1 to 9 As shown, a motor for high-reliability brake reset includes a brake stator 1 and a motor body disposed opposite to each other. The motor body includes a motor shaft 2 coaxially passing through the brake stator 1 and a brake disc 3 coaxially fixed on the motor shaft 2. The motor shaft 2 is rotatably connected to the brake stator 1 via a bearing 31. An electromagnetic brake is provided inside the brake stator 1, and the electromagnetic brake includes an electromagnetic coil 4 embedded in the brake stator 1. A movable armature 5 is disposed on the side of the electromagnetic coil 4 facing the brake disc 3 and is capable of moving axially along the motor shaft 2. The movable armature 5 has a friction layer 51 on the side facing the brake disc 3 and is disposed opposite to the end face of the brake disc 3. A reset spring 6 is provided around the brake stator 1, and the brake stator 1 has a spring cavity 111 for accommodating each reset spring 6, the spring cavity 111 extending axially along the motor shaft 2. An axial push block 7 is inserted into each of the spring cavities 111. The axial push block 7 abuts against the end of the return spring 6 away from the movable armature 5, and the other end of the return spring 6 abuts against the side of the movable armature 5 away from the brake disc 3. The axial push block 7 can move axially within the spring cavity 111, forming an adjustable bottom wall of the spring cavity 111, which is used to adjust the pre-compression of the return spring 6.

[0038] When the motor is stopped or de-energized, no current flows through the electromagnetic coil 4, and no magnetic force is generated. The movable armature 5 is pushed towards the brake disc 3 by the elastic force of the return spring 6. Its friction layer 51 is tightly pressed against the end face of the brake disc 3, which is mounted with the motor shaft 2, forming a reliable mechanical brake and preventing the motor shaft 2 from rotating. At this time, the axial push block 7 is located in the spring cavity 111 near the extreme position of the movable armature 5. The spring cavity 111 is at its minimum depth, and the return spring 6 is in its maximum pre-compression state, ensuring sufficient and stable braking force.

[0039] Before the motor is ready to start, the control system is activated, driving the axial push block 7 to move synchronously along the spring cavity 111 away from the movable armature 5. As the axial push block 7 retracts, the effective depth of the spring cavity 111 gradually increases, and the return spring 6 is partially released due to the rearward movement of the bottom wall, thus reducing its pre-compression and lowering the clamping force applied to the movable armature 5. This adjustment process does not rely on increasing the electromagnetic force, but rather on actively unloading the spring resistance to create low-resistance conditions for the subsequent release of the movable armature 5.

[0040] Subsequently, the electromagnetic coil 4 is energized, generating an axial magnetic field that attracts the movable armature 5 to overcome the reduced spring force and move into the brake stator 1. Because the preload of the return spring 6 has been optimized, even with slight voltage fluctuations in the electromagnetic coil 4 or minor residual magnetism interference, the movable armature 5 can still smoothly complete its full stroke until its friction layer 51 completely detaches from the brake disc 3 end face, forming a predetermined release gap. At this point, the motor shaft 2 can rotate freely, the brake disc 3 enters the reset state, and the motor can start safely.

[0041] Throughout the reset process, the position of the axial push block 7 directly determines the operating point of the reset spring 6: the further back the axial push block 7 is, the more relaxed the reset spring 6 becomes, and the easier it is for the movable armature 5 to be engaged. Conversely, when the axial push block 7 moves forward during braking, the reset spring 6 is fully pre-compressed, ensuring the reliability of the brake. This method of changing the initial load of the reset spring 6 through mechanical adjustment avoids the uncertainty brought about by relying solely on electromagnetic force to counteract the fixed spring force in traditional designs, fundamentally reducing the risk of false reset due to jamming, aging, or insufficient power supply.

[0042] When the motor is powered off again, the electromagnetic attraction disappears, and the return spring 6 immediately pushes the movable armature 5 back to its original position, re-pressing the brake disc 3. At the same time, the axial push block 7 returns to its previous limit position, restoring the maximum pre-compression of the return spring 6, providing consistent and sufficient clamping force for the next braking. The entire process requires no external intervention, achieving automatic switching between braking and highly reliable reset, ensuring that the equipment always has safe and stable start-stop performance during continuous operation.

[0043] See Figures 6 to 9As shown, the axial push block 7 and the inner wall of the corresponding spring cavity 111 are in clearance fit. A plurality of balls 112 are arranged around the axial push block 7 in the spring cavity 111. The balls 112 are in rolling contact with the outer periphery of the axial push block 7. The end of the axial push block 7 inserted into the spring cavity 111 is a tapered end.

[0044] During the insertion of the axial push block 7 into the spring cavity 111, its tapered end is first introduced into the cavity opening. The tapered surface guides the automatic alignment, effectively preventing jamming or scratches caused by assembly misalignment. As the axial push block 7 continues to be inserted, its outer circumference maintains a uniform clearance fit with the inner wall of the spring cavity 111, ensuring no rigid friction during movement.

[0045] Once the axial push block 7 is fully in place, multiple balls 112 are arranged in a circumferentially evenly distributed position within the annular gap between it and the inner wall of the spring cavity 111. These balls 112 simultaneously form point contact with the outer cylindrical surface of the axial push block 7 and the inner wall of the spring cavity 111, and roll as the axial push block 7 moves axially, converting the original sliding friction into rolling friction. This reduces the motion resistance of the axial push block 7 during the adjustment of the pre-compression of the return spring 6, enabling it to respond more sensitively and smoothly to position adjustments when the electromagnetic brake is reset or switched, while also reducing wear and improving long-term operational reliability and repeatability.

[0046] See Figures 6 to 9 As shown, the brake stator 1 includes an inner stator 11 and an outer stator 12 arranged coaxially. The inner stator 11 and the outer stator 12 are fixedly connected by circumferentially distributed connecting bolts 13. The spring cavity 111 is formed on the inner stator 11. An annular cavity for accommodating the ball 112 is formed between the opposite end faces of the inner stator 11 and the outer stator 12.

[0047] During the assembly of the brake stator 1, the inner stator 11 and the outer stator 12 are first aligned axially and coaxially fitted together, with their opposite end faces parallel and close to each other. Subsequently, the inner stator 11 and the outer stator 12 are fastened together as a whole by connecting bolts 13 evenly distributed along the circumference, forming a rigidly connected integral structure.

[0048] Since the spring cavity 111 is located inside the inner stator 11, and the balls 112 need to be arranged between the outer periphery of the axial push block 7 and the inner wall of the spring cavity 111, a small axial gap is reserved between the mating end faces of the inner stator 11 and the outer stator 12 after they are fastened. This gap extends continuously in the circumferential direction, forming a closed annular cavity. During assembly, the balls 112 are placed into this annular cavity and are located precisely in the annular space between the outer periphery of the axial push block 7 and the inner wall of the spring cavity 111. They are both radially limited by the inner stator 11 and axially blocked by the outer stator 12, thus ensuring the freedom of rolling while preventing them from falling out.

[0049] See Figures 6 to 9 As shown, the inner stator 11 has an axially extending sleeve portion 113 at one end facing the brake disc 3. The movable armature 5 has an annular structure, and its inner hole slides with the outer peripheral surface of the sleeve portion 113 to form an axial guide structure.

[0050] During brake assembly, the movable armature 5 is sleeved in a ring structure on the sleeve portion 113 of the inner stator 11 facing the brake disc 3. The sleeve portion 113 extends along the axial direction of the motor shaft 2 to form a cylindrical boss, and the two form a sliding fit pair.

[0051] When the electromagnetic coil 4 is energized or de-energized, the movable armature 5 needs to move along the motor shaft 2 to achieve reset or braking. At this time, the sleeve part 113 acts as a guide shaft, and its outer peripheral surface maintains continuous surface contact and relative sliding with the inner hole of the movable armature 5, effectively constraining the radial displacement and deflection of the movable armature 5, ensuring that it can only move smoothly along the axial direction. This not only prevents the movable armature 5 from tilting or jamming due to uneven force during movement, but also ensures that the brake disc 3 and the friction layer 51 remain parallel and in contact throughout the entire stroke, thereby improving the consistency of braking response and the reliability of the reset action.

[0052] See Figure 6 , Figure 7 , Figure 9 and Figure 11 As shown, an annular guide groove 121 communicating with each spring cavity 111 is provided on the end face of the outer stator 12 away from the inner stator 11. An annular guide plate 122 is provided in the annular guide groove 121. The annular guide plate 122 is fixedly connected to each axial push block 7 and is used to synchronously drive all axial push blocks 7 to move.

[0053] When the annular guide plate 122 moves axially, it translates axially under the constraint of the annular guide groove 121, synchronously driving all the axial push blocks 7 to move in the same direction and at equal distances within their respective spring cavities 111, thereby achieving uniform adjustment of the pre-compression of all the return springs 6. This ensures the high consistency of the movement of the multi-point axial push blocks 7, avoiding tilting or uneven force on the movable armature 5 caused by the lag of a single-sided axial push block 7, and providing a precise and stable mechanical coordination basis for the high-reliability reset of the brake.

[0054] See Figure 3 , Figures 6 to 9 As shown, the outer stator 12 is provided with a linear driver that is connected to the annular guide plate 122, and is provided with a mounting base 123 for mounting the linear driver and an outer protective shell 124.

[0055] When the linear actuator is working, its output component generates linear displacement along the axial direction of the motor shaft 2, and directly pushes or pulls the annular guide plate 122 to slide synchronously within the annular guide groove 121. At the same time, the outer protective shell 124 covers the outside of the outer stator 12, enclosing the entire linear actuator and forming a protective space, effectively isolating the linear actuator from external dust, oil, and mechanical collisions.

[0056] See Figures 6 to 11 As shown, the linear actuator is specifically a worm motor 8, which has a screw 81 extending axially along the motor shaft 2, and the annular guide plate 122 is provided with a threaded sleeve 82 that is threadedly engaged with the screw 81.

[0057] When the worm motor 8 is energized, the screw 81 rotates. Since the threaded sleeve 82 is fixedly connected to the annular guide plate 122 and the annular guide plate 122 is confined within the annular guide groove 121, it can only move axially and cannot rotate. The rotational motion of the screw 81 is converted into the linear axial displacement of the annular guide plate 122 through the threaded pair. This displacement is synchronously transmitted to all the axial push blocks 7 connected to the annular guide plate 122, causing them to move forward or backward smoothly and synchronously within their respective spring cavities 111, thereby precisely adjusting the pre-compression of the return spring 6.

[0058] The self-locking characteristic of the worm motor 8 can also maintain the position of the push block unchanged when the power is off, preventing displacement drift caused by the reverse push of the return spring 6 and ensuring the stability of the braking or reset state. In addition, due to its inherent high reduction ratio structure, the worm motor 8 can output high torque with low input power, which is sufficient to overcome the preload of the return spring 6 and the frictional resistance between moving parts, ensuring reliable driving of the annular guide plate 122 under various working conditions and achieving precise adjustment of the position of the axial push block 7.

[0059] See Figure 3 , Figures 6 to 9As shown, multiple worm motors 8 are evenly arranged circumferentially on the outer stator 12, forming a multi-point synchronous drive mechanism.

[0060] When all the worm motors 8 are powered on synchronously, each screw 81 rotates at the same time. Under the constraint that the annular guide plate 122 cannot rotate circumferentially, multiple threaded pairs work together to convert the rotational motion into a consistent axial thrust, driving the annular guide plate 122 to move smoothly along the axial direction.

[0061] Because the driving force is applied evenly from multiple points in the circumference, it effectively avoids the uneven load, tilting or jamming that may be caused by unilateral driving, and ensures that the annular guide plate 122 and all the axial push blocks 7 connected to it are subjected to balanced force and synchronous displacement during the adjustment process, thereby achieving high consistency control of the pre-compression amount of the reset spring 6 and improving the reliability and repeatability of the brake reset action.

[0062] See Figures 6 to 11 As shown, the annular guide groove 121 of the outer stator 12 is embedded with a plurality of axial guide blocks 1211 distributed circumferentially, and a guide channel is formed between adjacent axial guide blocks 1211. The threaded sleeve 82 on the annular guide plate 122 is slidably engaged in the corresponding guide channel to restrict the circumferential rotation of the threaded sleeve 82.

[0063] When the worm motor 8 drives the screw 81 to rotate, the threaded sleeve 82, limited by the axial guide blocks 1211 on both sides, cannot rotate with the screw 81 and can only slide axially along the guide channel. This forces the rotational motion of the screw 81 into a pure axial displacement of the annular guide plate 122. The constraint effectively suppresses the circumferential degree of freedom of the threaded sleeve 82, providing reliable guidance and anti-rotation protection for the synchronous adjustment of the axial push block 7.

[0064] See Figure 11 , Figure 12 and Figure 13 As shown, each of the axial guide blocks 1211 is provided with a mounting hole that extends through the thickness direction. A distance sensor 1212 is fixedly installed in the mounting hole. The detection end of the distance sensor 1212 faces the annular guide plate 122. A sensing point 1213 is provided at a corresponding position on the annular guide plate 122.

[0065] As the annular guide plate 122 moves axially within the annular guide groove 121, each sensing point 1213 synchronously passes through the detection area of ​​the corresponding distance sensor 1212. The distance sensor 1212 collects the change in distance between itself and the sensing point 1213 in real time and outputs a displacement signal. This process enables multi-point, non-contact real-time monitoring of the position of the annular guide plate 122, providing high-precision feedback for the control system, ensuring the consistency of synchronous movement of all axial push blocks 7, and promptly correcting the action when deviation or jamming occurs, thereby ensuring the high reliability of brake reset.

[0066] This invention utilizes an axially movable axial push block 7 within the spring cavity 111 to form an adjustable bottom wall, dynamically adjusting the pre-compression of the reset spring 6 to achieve automatic switching between reliable reset under low electromagnetic force and stable brake holding under high braking force. The tapered end of the axial push block 7 engages with the circumferential ball bearing 112, converting sliding friction into rolling friction. Furthermore, the annular cavity formed by the inner stator 11 and outer stator 12, when fastened together, limits the movement of the ball bearing 112, reducing resistance and preventing it from falling off.

[0067] Meanwhile, the movable armature 5 and the inner stator 11 sleeve portion 113 form a sliding guide pair, constraining radial offset and ensuring parallel contact of the friction surfaces. Furthermore, through the cooperation of the annular guide plate 122 and the annular guide groove 121, the multi-point circumferentially arranged worm motor 8 is linked, synchronously converting the rotational motion into axial linear displacement, driving all axial push blocks 7 to move in the same direction and at equal distances. Combined with the anti-rotation constraint of the threaded sleeve 82 and the self-locking high torque characteristics of the worm motor 8, high consistency in the adjustment of the axial push blocks 7 is achieved, comprehensively improving the reliability of the brake reset.

[0068] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A motor with high-reliability brake reset, comprising a brake stator and a motor body disposed opposite to each other, the motor body comprising a motor shaft coaxially passing through the brake stator and a brake disc coaxially fixed on the motor shaft, the motor shaft being rotatably connected to the brake stator via bearings; Its features are, The stator of the brake is equipped with an electromagnetic brake, which includes: The electromagnetic coil is embedded in the stator of the brake. A movable armature is provided on the side of the electromagnetic coil facing the brake disc and can move axially along the motor shaft. The movable armature is provided with a friction layer on the side facing the brake disc and is disposed opposite to the end face of the brake disc. A return spring is provided on each of the four sides of the brake stator. The brake stator is provided with a spring cavity for accommodating each return spring, and the spring cavity extends axially along the motor shaft. An axial push block is inserted into each of the spring cavities. The axial push block abuts against the end of the return spring away from the movable armature, and the other end of the return spring abuts against the side of the movable armature away from the brake disc. The axial push block can move axially within the spring cavity, forming an adjustable bottom wall of the spring cavity, which is used to adjust the pre-compression of the return spring.

2. The motor with high-reliability brake reset according to claim 1, characterized in that, The axial push block and the inner wall of the corresponding spring cavity are in clearance fit. Multiple balls are arranged around the axial push block inside the spring cavity. The balls are in rolling contact with the outer circumference of the axial push block. The end of the axial push block inserted into the spring cavity is a tapered end.

3. The motor with high-reliability brake reset according to claim 2, characterized in that, The brake stator includes an inner stator and an outer stator arranged coaxially. The inner stator and the outer stator are fixedly connected by circumferentially distributed connecting bolts. The spring cavity is formed on the inner stator. An annular cavity for accommodating the balls is formed between the opposite end faces of the inner stator and the outer stator.

4. The motor with high-reliability brake reset according to claim 3, characterized in that, The inner stator has an axially extending sleeve portion at one end facing the brake disc. The movable armature has a ring structure, and its inner hole slides with the outer peripheral surface of the sleeve portion to form an axial guide structure.

5. The motor with high-reliability brake reset according to claim 3, characterized in that, The outer stator has an annular guide groove on its end face away from the inner stator, which communicates with each spring cavity. An annular guide plate is provided in the annular guide groove, and the annular guide plate is fixedly connected to each axial push block to synchronously drive all axial push blocks to move.

6. The motor with high-reliability brake reset according to claim 5, characterized in that, The outer stator is provided with a linear driver that is connected to the annular guide plate, and is provided with a mounting base for mounting the linear driver and an outer protective shell.

7. A motor with high-reliability brake reset according to claim 6, characterized in that, The linear actuator is specifically a worm motor, which has a screw extending axially along the motor shaft, and the annular guide plate is provided with a threaded sleeve that is threadedly engaged with the screw.

8. The motor with high-reliability brake reset according to claim 7, characterized in that, Multiple worm motors are evenly arranged circumferentially on the outer stator to form a multi-point synchronous drive mechanism.

9. A motor with high-reliability brake reset according to claim 7, characterized in that, The annular guide groove of the outer stator is embedded with multiple circumferentially spaced axial guide blocks, and a guide channel is formed between adjacent axial guide blocks. The threaded sleeve on the annular guide plate is slidably engaged in the corresponding guide channel to restrict the circumferential rotation of the threaded sleeve.

10. A motor with high-reliability brake reset according to claim 9, characterized in that, Each of the axial guide blocks is provided with a mounting hole that extends through the thickness direction. A distance sensor is fixedly installed in the mounting hole. The detection end of the distance sensor faces the annular guide plate, and a sensing point is provided at a corresponding position on the annular guide plate.

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