An explosion-proof permanent magnet motor with magnetic eddy current and friction composite braking device

Abstract

The application relates to the technical field of motor equipment, in particular to an explosion-proof permanent magnet motor with a magnetic eddy current and friction composite braking device. The explosion-proof permanent magnet motor with the magnetic eddy current and friction composite braking device comprises a shell, a driving shaft and two braking mechanisms. The driving shaft is provided with a brake disc. Each braking mechanism comprises a rotating disc and a plurality of friction rods. The friction rods are intermittently switched between contact braking with the brake disc and contact heat dissipation with the shell, so that the heat of the brake disc can be timely conducted to the shell. Moreover, the friction rods rotate during sliding on the track, so as to change the position of the friction rods that are worn, thereby continuously changing the contact area of the friction rods with the brake disc and making the wear distribution more uniform. The application provides the explosion-proof permanent magnet motor with the magnetic eddy current and friction composite braking device, so as to solve the problems that, in the existing permanent magnet motor, a large amount of heat is generated by a friction ring during braking, the heat cannot be timely discharged, and the wear of a friction plate is uneven.

Description

Technical Field

[0001] This invention relates to the field of motor equipment technology, and specifically to an explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device. Background Technology

[0002] In special working environments with explosive gases, such as coal mines and petrochemical plants, explosion-proof permanent magnet motors have gained widespread application due to their high efficiency, compact structure, and inherent explosion-proof safety. Currently, the braking methods used in the motor field are mainly of two types: friction braking and eddy current braking. Friction braking is the most commonly used braking technology. It converts the system's kinetic energy into heat energy through the friction between the friction pads and the brake disc, thereby achieving braking. This braking method has the advantages of large braking torque and rapid response. Eddy current braking (or magnetic eddy current braking) is a non-contact braking technology. Its principle is to generate eddy currents in the brake disc through the relative motion between the magnetic field and the conductor brake disc, thereby converting kinetic energy into heat energy to achieve braking. This technology is a non-contact braking method with no mechanical wear, therefore it operates smoothly and has a long service life.

[0003] For example, patent application CN119651998A discloses a mining permanent magnet motor with braking function. Its braking function primarily reduces speed through the squeezing friction of the friction rings, supplemented by a mechanical interlocking structure to achieve final stopping. This design has the advantages of compact structure and low load. However, under frequent or prolonged braking conditions, the friction rings generate a large amount of heat. If heat dissipation is not timely, it will lead to a rapid accumulation of heat, causing thermal decay of the friction material and significantly reducing braking efficiency. Furthermore, due to the different linear velocities of the friction rings in the radial direction, the outer edge has a higher linear velocity, resulting in more severe temperature rise and wear. This uneven wear will intensify with accumulated working time, ultimately affecting the stability of the braking torque and shortening the component's lifespan. Summary of the Invention

[0004] This invention provides an explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device to solve the problems of existing permanent magnet motors where the friction ring generates a large amount of heat that cannot be dissipated in time during braking, and the uneven wear of the friction pads.

[0005] The explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device of the present invention adopts the following technical solution: The explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device includes a housing, a drive shaft, and two braking mechanisms. The drive shaft is rotatably disposed inside the housing, and a brake disc coaxial with it is disposed on the drive shaft.

[0006] Two braking mechanisms are located on either side of the brake disc along the axial direction of the drive shaft. Each braking mechanism includes a sliding disc, a rotating disc, and multiple friction rods. Both the sliding disc and the rotating disc are coaxial with the drive shaft. The sliding disc is slidably mounted on the drive shaft along its axial direction. A wavy track is provided on the sliding disc, with multiple mounting positions on the track; some mounting positions correspond to the brake disc, and some correspond to the outer casing.

[0007] A rotating disk is rotatably mounted on a sliding disk, and a friction rod is arranged along the axial direction of the rotating disk. One end of the friction rod is rotatably mounted on the rotating disk and abuts against the brake disc or housing. The other end of the friction rod is slidably mounted within a track, and rotates as it slides along the track.

[0008] The braking mechanism has a first state and a second state. In the first state, the friction rod and the brake disc are out of contact. In the second state, part of the friction rod abuts against the brake disc and brakes it, while another part of the friction rod abuts against the housing for heat dissipation. Moving the sliding disc causes the first state and the second state to switch between each other. Each time the rotating disc moves, it rotates forward by a first preset angle, causing each friction rod to move to the next installation position.

[0009] Furthermore, the diameter of the sliding disc is larger than that of the brake disc, and the sliding disc is divided into annular heating and cooling areas. The heating area corresponds to the brake disc and is located inside the cooling area, while the cooling area corresponds to the outer shell.

[0010] Multiple mounting positions on the track are alternately distributed circumferentially between the heat-generating and heat-dissipating areas. When the friction rod is located in a mounting position within the heat-generating area, it abuts against the brake disc. When the friction rod is located in a mounting position within the heat-dissipating area, it abuts against the housing.

[0011] Furthermore, each braking mechanism also includes an electromagnetic coil, which is mounted on and coaxially arranged on the sliding disc. When the electromagnetic coils in both braking mechanisms are energized, they generate a magnetic field. As the brake disc rotates, it cuts through this magnetic field, generating eddy currents, thereby producing braking force.

[0012] Furthermore, each braking mechanism also includes a fixed disk and an elastic element fixedly disposed within the housing. The fixed disk and the drive shaft are coaxial, and the fixed disk is disposed on the side of the sliding disk away from the brake disk. A permanent magnet is disposed on the fixed disk, and the elastic element connects the fixed disk and the sliding disk.

[0013] When the electromagnetic coil is energized, it generates a magnetic field that repels the permanent magnet, causing the sliding disc to move closer to the brake disc, thus changing the braking mechanism from the first state to the second state. When the electromagnetic coil is de-energized, the sliding disc moves away from the brake disc under the action of the elastic element, thus changing the braking mechanism from the second state to the first state.

[0014] Furthermore, each braking mechanism also includes a drive assembly, which includes multiple protrusions disposed on the peripheral wall of the rotating disk, the multiple protrusions being distributed circumferentially along the rotating disk.

[0015] The housing contains two guide components, each corresponding to a drive component. Each guide component includes multiple first guide blocks and multiple second guide blocks distributed circumferentially along the rotating disk. Along the axial direction of the rotating disk, the first guide blocks are positioned on the side closer to the brake disc relative to the second guide blocks. Along the circumferential direction of the rotating disk, each second guide block is positioned between two adjacent first guide blocks.

[0016] When the braking mechanism is in the first state, each protrusion abuts against a second guide block, and the space between two first guide blocks that are circumferentially adjacent to the second guide block is the target chamber. Along the rotation direction of the rotating disk, the next second guide block is located in front of the first second guide block.

[0017] Guided by the guide component, when the braking mechanism changes from the first state to the second state, the protrusion gradually approaches the brake disc and reaches the target chamber, and the rotating disc rotates by a first preset angle. When the braking mechanism changes from the second state to the first state, the protrusion gradually moves away from the brake disc, and the protrusion moves from the target chamber to the next second guide block, and the rotating disc rotates by the first preset angle again.

[0018] Furthermore, along the circumference of the rotating disk, the two sides of the first guide block are respectively the first side and the second side, and the two sides of the second guide block are respectively the third side and the fourth side. The first side and the second side are distributed sequentially along the rotation direction of the rotating disk, and the third side and the fourth side are distributed sequentially along the rotation direction of the rotating disk. When the braking mechanism is in the first state, each protrusion abuts against the fourth side of the second guide block.

[0019] The first guide block has a first inclined surface on its first side, and the second guide block has a second inclined surface parallel to and opposite to the first inclined surface on its fourth side. The first and second inclined surfaces form a guide channel. As the protrusion gradually approaches the brake disc, it enters the target cavity under the guidance of the guide channel. A magnet is provided on the second inclined surface. As the protrusion gradually moves away from the brake disc, it abuts against the fourth side of the next second guide block under the attraction of the magnet.

[0020] Furthermore, the rotating disk has multiple first sliding grooves, which are arranged circumferentially along the rotating disk and radially along the rotating disk. Each friction rod is slidably disposed within one first sliding groove along the radial direction of the rotating disk.

[0021] Furthermore, an explosion-proof permanent magnet motor with a magnetic eddy current and friction composite braking device also includes a motor, wherein the output shaft and the drive shaft of the motor are coaxially and fixedly connected.

[0022] Furthermore, an end cap is fixedly installed at each end of the housing along the drive shaft.

[0023] Furthermore, the friction rod includes a slider, a fixed rod, and a friction disc connected in sequence. The friction disc is used to contact the brake disc. The slider makes frictional contact with the track, causing the slider to rotate during sliding.

[0024] The beneficial effects of this invention are as follows: In the explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device, when the braking mechanism transitions between its first and second states, the rotating disc rotates forward by a first preset angle each time it moves, causing each friction rod to move to the next installation position. The friction rods intermittently switch between contacting the brake disc for braking and contacting the outer casing for heat dissipation, effectively transferring heat from the brake disc to the outer casing and preventing brake fade, thereby maintaining a stable brake disc temperature.

[0025] Furthermore, as the friction rod slides on the track, it rotates to change the position of wear on the friction rod, thereby continuously changing its contact area with the brake disc, making the wear distribution more uniform, avoiding the formation of local deep pits, maintaining stable and efficient braking performance over a long period of time, and extending its service life. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of an explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device provided in an embodiment of the present invention;

[0028] Figure 2 This is a partial structural schematic diagram of an explosion-proof permanent magnet motor with a composite braking device of magnetic eddy current and friction provided in an embodiment of the present invention;

[0029] Figure 3 A front view of a portion of the structure of an explosion-proof permanent magnet motor having a combined magnetic eddy current and friction braking device, provided in an embodiment of the present invention;

[0030] Figure 4 for Figure 3 Sectional view along the middle AA direction;

[0031] Figure 5 A schematic diagram of the braking mechanism of an explosion-proof permanent magnet motor with a magnetic eddy current and friction composite braking device in the first state, provided for an embodiment of the present invention;

[0032] Figure 6 A schematic diagram of the braking mechanism of an explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device is provided for an embodiment of the present invention.

[0033] Figure 7 An exploded view of the braking mechanism of an explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device, provided in an embodiment of the present invention.

[0034] Figure 8 A schematic diagram of the housing of an explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device provided in an embodiment of the present invention;

[0035] Figure 9 for Figure 8 Enlarged view of point B in the middle.

[0036] In the diagram: 100, motor; 201, end cover; 202, drive shaft; 203, outer casing; 204, fixed disk; 205, sliding disk; 206, electromagnetic coil; 207, brake disk; 208, friction rod; 209, rotating disk; 2091, protrusion; 210, ventilation groove; 220, track; 230, elastic element; 240, connecting shaft; 241, limiting groove; 250, permanent magnet; 260, first guide block; 261, second guide block; 262, first inclined surface; 263, second inclined surface; 270, first sliding groove; 280, bearing. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Reference Figures 1 to 9 As shown in the figure, an explosion-proof permanent magnet motor with a magnetic eddy current and friction composite braking device provided by an embodiment of the present invention includes a housing 203, a drive shaft 202, and two braking mechanisms. The drive shaft 202 is rotatably disposed within the housing 203, and a brake disc 207 coaxial with it is disposed on the drive shaft 202.

[0039] Two braking mechanisms are located on opposite sides of the brake disc 207 along the axial direction of the drive shaft 202. Each braking mechanism includes a sliding disc 205, a rotating disc 209, and multiple friction rods 208. Both the sliding disc 205 and the rotating disc 209 are coaxial with the drive shaft 202. The sliding disc 205 is slidably mounted on the drive shaft 202 along its axial direction. A wavy track 220 is provided on the sliding disc 205, with multiple mounting positions on the track 220, some corresponding to the brake disc 207 and some corresponding to the housing 203.

[0040] A rotating disk 209 is rotatably mounted on a sliding disk 205. A friction rod 208 is arranged along the axial direction of the rotating disk 209. One end of the friction rod 208 is rotatably mounted on the rotating disk 209 and abuts against the brake disk 207 or the housing 203. The other end of the friction rod 208 is slidably mounted within a track 220, and rotates as it slides along the track 220. Each friction rod 208 is in a single mounting position.

[0041] The braking mechanism has a first state and a second state. In the first state, the friction rod 208 and the brake disc 207 are out of contact. In the second state, part of the friction rod 208 abuts against the brake disc 207 and brakes it, while another part of the friction rod 208 abuts against the housing 203 for heat dissipation. Moving the sliding disk 205 causes the first state and the second state to switch between each other. Each time the rotating disk 209 moves, it rotates forward by a first preset angle, causing each friction rod 208 to move to the next installation position.

[0042] Initially, the braking mechanism is in the first state. When braking is required, the movable sliding disc 205 moves towards the brake disc 207, and the movable sliding disc 205 drives the rotating disc 209 to move synchronously until the friction rod 208 and the brake disc 207 come into contact, and friction braking is applied to the brake disc 207. The braking mechanism then transitions from the first state to the second state.

[0043] When braking is not required, the sliding disc 205 moves away from the brake disc 207, causing the friction rod 208 to disengage from the brake disc 207. The braking mechanism transitions from the second state to the first state, with part of the friction rod 208 abutting against the brake disc 207 and braking it, while another part of the friction rod 208 abuts against the housing 203 for heat dissipation.

[0044] When the braking mechanism transitions between its first and second states, the rotating disk 209 rotates forward by a first preset angle each time it moves, causing each friction rod 208 to move to the next installation position. The friction rod 208 intermittently switches between contacting the brake disk 207 for braking and contacting the housing 203 for heat dissipation, which can promptly conduct the heat of the brake disk 207 to the housing 203, thereby maintaining the stability of the temperature of the brake disk 207.

[0045] Furthermore, as the friction rod 208 slides on the track 220, it rotates, thereby continuously changing its contact area with the brake disc 207, making the wear distribution more uniform, avoiding the generation of local deep pits, maintaining stable and efficient braking performance for a long time, and extending its service life.

[0046] In this embodiment, the diameter of the sliding disc 205 is larger than the diameter of the brake disc 207. The sliding disc 205 is divided into annular heating and cooling areas. The heating area corresponds to the brake disc 207 and is located inside the cooling area. A ventilation groove 210 is provided on the outer side of the housing 203. The ventilation groove 210 is coaxially arranged with the drive shaft 202 and corresponds to the cooling area. The ventilation groove 210 can increase the contact area between the housing 203 and the outside, further accelerating the heat dissipation of the housing 203.

[0047] Multiple mounting positions on track 220 are alternately distributed circumferentially between the heat-generating and heat-dissipating areas. When the friction rod 208 is located in a mounting position within the heat-generating area, it abuts against the brake disc 207. When the friction rod 208 is located in a mounting position within the heat-dissipating area, it abuts against the inner wall of the housing 203.

[0048] In this embodiment, each braking mechanism further includes an electromagnetic coil 206, which is disposed on and coaxially arranged with the sliding disk 205. When the electromagnetic coils 206 in both braking mechanisms are energized, they generate a magnetic field. When the brake disk 207 rotates, it cuts this magnetic field to generate eddy currents, thereby generating braking force.

[0049] In this embodiment, each braking mechanism further includes a fixed disk 204 and an elastic element 230 fixedly disposed within the housing 203. The fixed disk 204 is coaxial with the drive shaft 202, and the fixed disk 204 is disposed on the side of the sliding disk 205 away from the brake disk 207. A permanent magnet 250 is disposed on the fixed disk 204. The elastic element 230 connects the fixed disk 204 and the sliding disk 205.

[0050] Each fixed disk 204 has multiple limiting grooves 241, which are distributed sequentially along the circumference of the fixed disk 204, and each limiting groove 241 is arranged along the axial direction of the fixed disk 204. Multiple connecting shafts 240 are fixedly mounted on the sliding disk 205, and the connecting shafts 240 are arranged along the axial direction of the sliding disk 205. Each connecting shaft 240 is slidably disposed within a limiting groove 241.

[0051] When the electromagnetic coil 206 is energized, it generates a magnetic field that repels the permanent magnet 250, causing the sliding disc 205 to move closer to the brake disc 207, thereby changing the braking mechanism from the first state to the second state. When the electromagnetic coil 206 is de-energized, under the action of the elastic element 230, the sliding disc 205 moves away from the brake disc 207, thereby changing the braking mechanism from the second state to the first state.

[0052] In this embodiment, each braking mechanism further includes a driving component, which includes a plurality of protrusions 2091 disposed on the peripheral wall of the rotating disk 209, and the plurality of protrusions 2091 are distributed along the circumference of the rotating disk 209.

[0053] The housing 203 contains two guide components, each corresponding to a drive component. Each guide component includes a plurality of first guide blocks 260 and a plurality of second guide blocks 261 distributed circumferentially along the rotating disk 209. Along the axial direction of the rotating disk 209, the first guide blocks 260 are positioned on the side closer to the brake disk 207 relative to the second guide blocks 261. Along the circumferential direction of the rotating disk 209, each second guide block 261 is positioned between two adjacent first guide blocks 260.

[0054] When the braking mechanism is in the first state, each protrusion 2091 and a second guide block 261 abut against each other, and the space between two first guide blocks 260 that are circumferentially adjacent to the second guide block 261 is the target chamber. Along the rotation direction of the rotating disk 209, the one located in front of the second guide block 261 is the next second guide block 261.

[0055] Guided by the guiding component, when the braking mechanism changes from the first state to the second state, as the sliding disc 205 moves towards the brake disc 207, the protrusion 2091 gradually approaches the brake disc 207 and reaches the target chamber, while the rotating disc 209 rotates by a first preset angle. When the braking mechanism changes from the second state to the first state, the protrusion 2091 gradually moves away from the brake disc 207, and moves from the target chamber to the next second guide block 261, while the rotating disc 209 rotates by the first preset angle again.

[0056] In this embodiment, along the circumference of the rotating disk 209, the two sides of the first guide block 260 are respectively the first side and the second side, and the two sides of the second guide block 261 are respectively the third side and the fourth side. The first side and the second side are distributed sequentially along the rotation direction of the rotating disk 209, and the third side and the fourth side are distributed sequentially along the rotation direction of the rotating disk 209. When the braking mechanism is in the first state, each protrusion 2091 and the fourth side of the second guide block 261 abut against each other.

[0057] The first guide block 260 has a first inclined surface 262 on its first side. Along the rotation direction of the rotating disk 209, the first inclined surface 262 gradually approaches the brake disk 207. The second guide block 261 has a second inclined surface 263 on its fourth side, parallel to and opposite to the first inclined surface 262. The first inclined surface 262 and the second inclined surface 263 form a guide channel. As the protrusion 2091 gradually approaches the brake disk 207, guided by the guide channel, the protrusion 2091 enters the target cavity. A magnet is provided on the second inclined surface 263. As the protrusion 2091 gradually moves away from the brake disk 207, under the attraction of the magnet, the protrusion 2091 abuts against the fourth side of the next second guide block 261.

[0058] In this embodiment, the rotating disk 209 has a plurality of first sliding grooves 270, which are arranged along the circumference of the rotating disk 209 and each first sliding groove 270 is arranged along the radial direction of the rotating disk 209. Each friction rod 208 is slidably disposed within one first sliding groove 270 along the radial direction of the rotating disk 209.

[0059] In this embodiment, an explosion-proof permanent magnet motor with a magnetic eddy current and friction composite braking device also includes a motor 100, the output shaft of the motor 100 and the drive shaft 202 being coaxially and fixedly connected.

[0060] In this embodiment, an end cap 201 is fixedly installed on both ends of the housing 203 along the drive shaft 202. Two bearings 280 are provided inside the housing 203. The bearings 280 are coaxial with the drive shaft 202. The two bearings 280 are located on both sides of the brake disc 207. The inner ring of the bearing 280 is engaged with the drive shaft 202, and the outer ring is fixedly connected to the fixed disc 204.

[0061] In this embodiment, the friction rod 208 sequentially connects a slider, a fixed rod, and a friction disc, the friction disc being used to contact the brake disc 207. The track 220 includes a first groove and a second groove that are parallel to each other and interconnected, and the first groove and the second groove are sequentially distributed along a direction gradually moving away from the rotating disc 209. The fixed rod is slidably disposed in the first groove, and the slider is slidably disposed in the second groove, with the sidewalls of the slider and the second groove in frictional contact. Due to the friction between the slider and the sidewall of the second groove, the slider rotates when sliding.

[0062] Operating process: In the initial state, the braking mechanism is in the first state, the friction rod 208 and the brake disc 207 are out of contact, and the electromagnetic coil 206 is not energized. The fourth side of each protrusion 2091 and a second guide block 261 abuts against each other.

[0063] Start the motor 100, which drives the drive shaft 202 and the brake disc 207 to rotate synchronously. The drive shaft 202 and the brake disc 207 rotate relative to the housing 203 and the braking mechanism.

[0064] When braking is required, the electromagnetic coil 206 is energized, generating a magnetic field that repels the permanent magnet 250, thereby driving the sliding disk 205 and the rotating disk 209 to move synchronously. The sliding disk 205 and the rotating disk 209 move towards the brake disk 207 until the friction rod 208, located in the heating area, comes into contact with the brake disk 207, applying frictional braking to it. Simultaneously, the energized electromagnetic coils 206 in both braking mechanisms generate magnetic fields. As the brake disk 207 rotates, it cuts through these magnetic fields, generating eddy currents and thus braking force. The braking mechanism then transitions from the first state to the second state.

[0065] When braking is not required, the electromagnetic coil 206 is de-energized, and under the action of the elastic element 230, the sliding disc 205 moves away from the brake disc 207. The sliding disc 205 drives the rotating disc 209 to move synchronously, causing the friction rod 208 and the brake disc 207 to disengage. The braking mechanism then transitions from the second state to the first state.

[0066] As the rotating disk 209 approaches the brake disk 207, the protrusion 2091 enters the target cavity under the guidance of the guide channel. The protrusion 2091 drives the rotating disk 209 to rotate forward by a first preset angle. The rotating disk 209 drives multiple friction rods 208 to rotate synchronously. One end of the friction rod 208 slides in the groove of the track 220, and the other end slides in the first sliding groove 270 of the rotating disk 209, so that each friction rod 208 moves from the current installation position to the next installation position along the rotation direction.

[0067] As the rotating disk 209 moves away from the brake disk 207, the protrusion 2091 and the fourth side of the next second guide block 261 abut against each other under the attraction of the magnet. The protrusion 2091 drives the rotating disk 209 to rotate forward again by a first preset angle, and each friction rod 208 moves again from the current mounting position to the next mounting position along the rotation direction.

[0068] The friction rod 208, located within the heat-generating area, moves multiple times until it reaches the heat-dissipating area. Within this area, the friction rod 208 abuts against the housing 203, dissipating heat. Furthermore, within the heat-dissipating area, the friction rod 208 conducts heat through contact with the housing 203 and aligns with the ventilation groove 210, further accelerating heat dissipation. After further movement, the friction rod 208 returns to the heat-generating area and abuts against the brake disc 207. The friction rod 208 intermittently switches between contact with the brake disc 207 for braking and contact with the housing 203 for heat dissipation, effectively transferring heat from the brake disc 207 to the housing 203 and maintaining a stable temperature for the brake disc 207.

[0069] The diameter of the friction disc is much smaller than that of the brake disc 207. Therefore, when the friction disc and brake disc 207 are in contact, the thickness difference between the worn and unworn areas on the friction disc is small. Furthermore, during the sliding process of the slider within the second groove, the slider and the sidewalls of the second groove rub against each other, causing the slider to rotate and consequently the friction disc to rotate. This changes the position of the worn areas on the friction disc, resulting in more uniform wear and maintaining a highly efficient braking effect.

[0070] Because different motor specifications have different performance, the required braking and non-braking times also differ. When the required braking time is longer than the non-braking time, the friction disc's heat dissipation will be inadequate, leading to heat accumulation. Therefore, adjusting the number of mounting positions within the heat-generating and heat-dissipating areas changes the time the friction disc spends in the heat-generating and heat-dissipating areas each time it brakes the brake disc 207. This ensures that the friction disc spends more time in the heat-dissipating area than in the heat-generating area, allowing the heat generated on the friction disc to dissipate more effectively.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device, characterized in that: It includes a housing, a drive shaft, and two braking mechanisms; the drive shaft is rotatably mounted inside the housing, and a brake disc coaxial with it is mounted on the drive shaft; Two braking mechanisms are located on both sides of the brake disc along the axial direction of the drive shaft; each braking mechanism includes a sliding disc, a rotating disc and multiple friction rods; both the sliding disc and the rotating disc are coaxial with the drive shaft; the sliding disc is slidably mounted on the drive shaft along the axial direction of the drive shaft; a wavy track is provided on the sliding disc along its circumference, and multiple mounting positions are provided on the track, some of which correspond to the brake disc and some of which correspond to the outer casing; The rotating disk is rotatably mounted on the sliding disk, and the friction rod is arranged along the axial direction of the rotating disk; one end of the friction rod is rotatably mounted on the rotating disk and abuts against the brake disk or the outer casing; the other end of the friction rod is slidably mounted in the track, and the friction rod rotates when it slides along the track. The braking mechanism has a first state and a second state. In the first state, the friction rod and the brake disc are out of contact. In the second state, part of the friction rod abuts against the brake disc and brakes the brake disc, while another part of the friction rod abuts against the outer shell for heat dissipation. Moving the sliding disc causes the first state and the second state to switch between each other. Each time the rotating disc moves, it rotates forward by a first preset angle, causing each friction rod to move to the next installation position. Each braking mechanism also includes an electromagnetic coil, which is mounted on the sliding disc and coaxially with it; when the electromagnetic coils in both braking mechanisms are energized, they generate a magnetic field; when the brake disc rotates, it cuts the magnetic field to generate eddy currents, thereby generating braking force. Each braking mechanism also includes a fixed disk and an elastic element fixedly installed inside the housing. The fixed disk and the drive shaft are coaxial, and the fixed disk is located on the side of the sliding disk away from the brake disk. A permanent magnet is provided on the fixed disk, and the elastic element connects the fixed disk and the sliding disk. When the electromagnetic coil is energized, it generates a magnetic field that repels the permanent magnet, causing the sliding disc to move closer to the brake disc, thus changing the braking mechanism from the first state to the second state. When the electromagnetic coil is de-energized, the sliding disc moves away from the brake disc under the action of the elastic element, thus changing the braking mechanism from the second state to the first state.

2. The explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device according to claim 1, characterized in that: The diameter of the sliding disc is larger than that of the brake disc. The sliding disc is divided into annular heating and cooling areas. The heating area corresponds to the brake disc and is located inside the cooling area. The cooling area corresponds to the outer shell. Multiple mounting positions on the track are alternately distributed circumferentially in the heat-generating and heat-dissipating areas; when the friction rod is located in the mounting position within the heat-generating area, the friction rod abuts against the brake disc; when the friction rod is located in the mounting position within the heat-dissipating area, the friction rod abuts against the housing.

3. The explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device according to claim 1, characterized in that: Each braking mechanism also includes a drive assembly, which includes multiple protrusions disposed on the peripheral wall of the rotating disk, the multiple protrusions being distributed circumferentially along the rotating disk; The housing contains two guide components, each corresponding to a drive component. Each guide component includes multiple first guide blocks and multiple second guide blocks distributed along the circumference of the rotating disk. Along the axial direction of the rotating disk, the first guide blocks are positioned on the side closer to the brake disk relative to the second guide blocks. Along the circumference of the rotating disk, each second guide block is positioned between two adjacent first guide blocks. When the braking mechanism is in the first state, each protrusion and a second guide block abut against each other, and the space between two first guide blocks that are circumferentially adjacent to the second guide block is the target chamber; along the rotation direction of the rotating disk, the one in front of the second guide block is the next second guide block; Under the guidance of the guide component, when the braking mechanism changes from the first state to the second state, the protrusion gradually approaches the brake disc and reaches the target chamber, and the rotating disc rotates at the first preset angle; when the braking mechanism changes from the second state to the first state, the protrusion gradually moves away from the brake disc, and the protrusion moves from the target chamber to the next second guide block, and the rotating disc rotates at the first preset angle again.

4. The explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device according to claim 3, characterized in that: Along the circumference of the rotating disk, the two sides of the first guide block are the first side and the second side, and the two sides of the second guide block are the third side and the fourth side, respectively; the first side and the second side are distributed sequentially along the rotation direction of the rotating disk, and the third side and the fourth side are distributed sequentially along the rotation direction of the rotating disk; when the braking mechanism is in the first state, each protrusion abuts against the fourth side of the second guide block; The first guide block has a first inclined surface on its first side, and the second guide block has a second inclined surface on its fourth side that is parallel to and opposite to the first inclined surface. The first and second inclined surfaces form a guide channel. When the protrusion gradually approaches the brake disc, it enters the target cavity under the guidance of the guide channel. A magnet is provided on the second inclined surface. When the protrusion gradually moves away from the brake disc, it abuts against the fourth side of the next second guide block under the attraction of the magnet.

5. The explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device according to claim 1, characterized in that: The rotating disk has multiple first sliding grooves, which are arranged along the circumference of the rotating disk and along the radial direction of the rotating disk. Each friction rod is slidably arranged in one of the first sliding grooves along the radial direction of the rotating disk.

6. The explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device according to claim 1, characterized in that: It also includes an electric motor, whose output shaft and drive shaft are coaxially and fixedly connected.

7. The explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device according to claim 1, characterized in that: An end cap is fixedly installed at each end of the housing along the drive shaft.

8. The explosion-proof permanent magnet motor with a combined magnetic eddy current and friction braking device according to claim 1, characterized in that: The friction rod includes a slider, a fixed rod, and a friction disc connected in sequence; the friction disc is used to contact the brake disc; the slider and the track make frictional contact, causing the slider to rotate when sliding.

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