Permanent magnet synchronous motor with overheat protection function

Abstract

The application relates to the technical field of electric machines, in particular to a permanent magnet synchronous motor with an overheat protection function, which comprises a motor shell assembly, a stator assembly, a rotor assembly and a heat dissipation fan, further comprises a linear actuator, an air guide adjusting ring and an adjustable air inlet assembly, when the motor is overheated, the linear actuator drives the axial displacement of the stator assembly, the axial coupling length of the stator core and the rotor core is reduced, the motor output torque is reduced from the electromagnetic coupling level, the heating of the winding is reduced, and the temperature rise is inhibited from the source; at the same time, when the stator assembly moves, the air guide adjusting ring is synchronously driven to act, the adjusting air baffle assembly is pushed to reduce the air passage flow area of the square air guide pipe, the cooling airflow velocity is improved, the heat dissipation capacity is strengthened, the two dimensions are cooperated, efficient overheat protection can be realized without shutdown, continuous operation of the energy-saving motor is guaranteed, and the continuous production demand of the high-efficiency energy-saving industry is adapted.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a permanent magnet synchronous motor with overheat protection. Background Technology

[0002] With the continuous advancement of the high-efficiency and energy-saving industry, energy-saving electric motors, with their low loss and high energy efficiency, have become core power equipment in fields such as industrial transmission, intelligent manufacturing, and fluid transportation. Among them, permanent magnet synchronous motors, due to their high power density, excellent speed regulation performance, and high operating efficiency, are currently the mainstream products of energy-saving electric motors, providing core power support for cost reduction, efficiency improvement, and green transformation in the high-efficiency and energy-saving industry.

[0003] However, in actual operation, when a permanent magnet synchronous motor operates under high load and high speed conditions for extended periods, the stator windings and core generate a large amount of heat. If this heat cannot be dissipated in time, it will accelerate the aging of the winding insulation, increase the risk of demagnetization of the permanent magnets, severely shorten the motor's lifespan, and even cause operational failures. Existing overheat protection schemes for energy-saving motors mostly employ temperature detection combined with shutdown and power-off protection logic. While this can prevent motor burnout, it directly interrupts the production process, significantly impacting the continuous operating efficiency of the equipment. Furthermore, existing overheat protection technologies do not link electromagnetic load adjustment with heat dissipation capacity adjustment, failing to reduce heat generation at the source by lowering the electromagnetic coupling strength when the motor overheats. Some existing technologies propose speed regulation schemes involving axial stator movement, but these are not linked to the heat dissipation system, meaning that heat dissipation capacity cannot be increased synchronously when overheating, resulting in limited protection effectiveness.

[0004] Therefore, there is an urgent need for a permanent magnet synchronous motor with overheat protection that can operate without interruption and has coordinated electromagnetic unloading and heat dissipation regulation. Summary of the Invention

[0005] The purpose of this invention is to provide a permanent magnet synchronous motor with overheat protection function, so as to solve the problems mentioned in the background art of existing energy-saving permanent magnet synchronous motors that require shutdown for overheat protection, cannot coordinate electromagnetic unloading and heat dissipation regulation, and cannot dynamically adjust the heat dissipation duct.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a permanent magnet synchronous motor with overheat protection function, comprising a motor housing assembly, a stator assembly, a rotor assembly and a cooling fan, and further comprising a linear actuator, an air guide adjustment ring and an adjustable air intake assembly. The motor housing assembly has an axial mounting cavity, the rotor assembly is rotatably supported at the axial position of the cavity, the stator assembly is slidably mounted in the cavity and coaxially sleeved on the outside of the rotor assembly, and a linear actuator is fixedly mounted on the top of the motor housing assembly, the telescopic end of which penetrates the housing and is fixedly connected to the stator assembly.

[0007] The stator assembly is fixedly connected to the air inlet side with an air guide adjustment ring. The air guide adjustment ring includes an annular support frame and multiple sets of adjustment and holding components arranged circumferentially. An adjustable air inlet assembly is fixedly installed on the air inlet side of the receiving cavity. The adjustable air inlet assembly includes a mounting ring plate, a circumferentially arranged square air guide pipe, and an adjustment air plate assembly hinged in the pipe. The adjustment and holding components and the adjustment air plate assembly abut against each other and drive each other.

[0008] The cooling fan is sleeved on the shaft of the rotor assembly and is used to generate airflow along the axial direction of the receiving cavity.

[0009] As a preferred embodiment of the permanent magnet synchronous motor with overheat protection function described in this invention, the motor housing assembly includes a left base housing, a right base housing, and a rear end cover. The left base housing and the right base housing are axially connected and fixed together, and the rear end cover is connected to the outer end of the left base housing. The three together enclose the mounting cavity.

[0010] The left base housing includes a top through slot, a positioning slot 1, and a plug-in hole. The top of the left base housing has a top through slot, and the inner wall has an axially extending positioning slot 1. There are four sets of positioning slot 1, and each set of positioning slot 1 has a plug-in hole.

[0011] The right base housing includes a housing end, a front cover, a second positioning groove, a threaded connection hole, a heat dissipation vent, and a first central bearing. The inner wall of the housing end is provided with a second positioning groove, which is arranged in four sets. Each set of the second positioning groove is provided with a threaded connection hole. The center of the front cover is embedded with a first central bearing, and the cover body of the front cover is provided with a heat dissipation vent.

[0012] The rear end cover has a central bearing embedded in its center, and the cover body of the rear end cover has a heat dissipation air inlet.

[0013] As a preferred embodiment of the permanent magnet synchronous motor with overheat protection function described in this invention, the stator assembly includes a stator core, a positioning connecting frame, and a guide assembly. The positioning connecting frame is fixedly sleeved on both ends of the outer circumferential surface of the stator core, and its top is fixedly connected to the telescopic end of the linear actuator. The guide assembly is connected to the positioning connecting frame and is installed in positioning slot one and positioning slot two. The stator core is axially movable within the motor housing assembly through the cooperation of the positioning connecting frame and the guide assembly.

[0014] As a preferred embodiment of the permanent magnet synchronous motor with overheat protection function described in this invention, the positioning connection frame includes a fixed ring, multiple connecting ears, and multiple guide sliders. The fixed ring is coaxially fixed to both ends of the outer peripheral surface of the stator core. The connecting ears are fixedly disposed on the outer wall of the fixed ring and extend from the top through slot to connect with the telescopic end of the linear actuator. The guide sliders are fixed to the outer wall of the fixed ring and positioned in the first positioning slot and the second positioning slot.

[0015] As a preferred embodiment of the permanent magnet synchronous motor with overheat protection function described in this invention, the guide assembly includes a guide rod, a threaded column end, a plug-in column end, and a disc spring. The guide rod is movably inserted into the hole of the guide slider. The threaded column end and the plug-in column end are respectively fixed at both ends of the guide rod. The plug-in column end is inserted into the plug-in hole, and the threaded column end is threadedly fixed into the threaded connection hole. The disc spring is fitted onto the end of the guide rod where the plug-in column end is located. The disc spring abuts against the side of the guide slider and the end of the positioning groove, providing an elastic preload force for the stator assembly to return to the air outlet side.

[0016] As a preferred embodiment of the permanent magnet synchronous motor with overheat protection function described in this invention, the rotor assembly includes a rotor core and a motor shaft. The rotor core is fixedly sleeved on the middle section of the motor shaft. The two ends of the motor shaft are rotatably supported in a central bearing and a central bearing, respectively, to achieve circumferential rotation and axial positioning. The cooling fan is fixedly sleeved on the section of the motor shaft near the rear end cover.

[0017] As a preferred embodiment of the permanent magnet synchronous motor with overheat protection function described in this invention, the annular support frame includes a support leg, an outer ring, a reinforcing bar, and an inner ring. The outer ring and the inner ring are arranged coaxially and spaced apart. The reinforcing bar is radially connected between the outer ring and the inner ring. The support leg is fixed to the end face of the outer ring facing the stator assembly. The support leg is fixedly connected to the end face of the stator core.

[0018] As a preferred embodiment of the permanent magnet synchronous motor with overheat protection function described in this invention, the adjusting pressure holding assembly is evenly distributed circumferentially on the end faces of the outer ring and inner ring facing the adjustable air intake assembly. The adjusting pressure holding assembly includes a pressure holding arm, a reinforcing rib, a pressing shaft, and a sleeve. The reinforcing rib is fixed between two sets of the pressure holding arms to enhance the structural strength. The pressing shaft is fixed to the end of the pressure holding arm. The sleeve is rotatably sleeved on the pressing shaft. The outer circumferential surface of the sleeve rolls and abuts against the adjusting air plate assembly.

[0019] As a preferred embodiment of the permanent magnet synchronous motor with overheat protection function described in this invention, the mounting ring plate is coaxially fixed to the inner wall of the rear end cover, and a plurality of square air guide pipes are uniformly fixed on the plate body of the mounting ring plate along the circumference, with each square air guide pipe being axially continuous.

[0020] As a preferred embodiment of the permanent magnet synchronous motor with overheat protection function described in this invention, each of the adjusting air vane assemblies is correspondingly hinged to the side wall of a square air guide duct. The adjusting air vane assembly includes an air guide plate, a hinge shaft, a torsion spring, a contact wedge, and a limiting stop. The air guide plate is hinged to the side wall of the square air guide duct via the hinge shaft. The torsion spring is sleeved on the hinge shaft, with its two ends abutting against the air guide plate and the inner wall of the square air guide duct, respectively, to drive the air guide plate to rotate and reset to the outside of the air guide duct. The contact wedge is fixed to the upper end face of the air guide plate, and the limiting stop is fixed to the top of the inclined surface of the contact wedge to limit the maximum movement distance of the sleeve. The contact wedge has an inclined abutment surface. The sleeve of the adjusting pressure assembly abuts against the inclined surface, and the air guide plate is driven to rotate through the inclined surface to reduce the flow area of ​​the square air guide duct and increase the airflow velocity.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. When the motor overheats, this invention drives the stator assembly to shift axially via a linear actuator, reducing the axial coupling length between the stator core and the rotor core. This reduces the motor's output torque and winding heating from the electromagnetic coupling perspective, suppressing temperature rise at its source. Simultaneously, the movement of the stator assembly drives the air guide adjustment ring to move, pushing the adjustment fan assembly to reduce the airflow area of ​​the square air guide duct, increasing the cooling airflow velocity and enhancing heat dissipation. These two aspects work synergistically to achieve efficient overheat protection without stopping the machine, ensuring continuous operation of the energy-saving motor and meeting the continuous production needs of energy-efficient industries.

[0023] 2. The air guide adjustment ring moves axially synchronously with the stator assembly. It drives the air guide plate to rotate through the inclined surface abutting the transmission. There is no need to set up additional air duct drive components. Torque adjustment and air volume adjustment can be achieved simultaneously through a single power source. The structure is compact and the transmission is reliable, which greatly reduces the structural complexity and control cost. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall first-view structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the overall second-view structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the overall internal structure of the present invention;

[0027] Figure 4 This is a first-view structural diagram of the disassembled motor housing assembly of the present invention;

[0028] Figure 5 This is a second-view structural diagram of the disassembled motor housing assembly of the present invention;

[0029] Figure 6 This is a schematic diagram of the stator assembly, rotor assembly, linear actuator, air guide ring, adjustable air intake assembly and cooling fan of the present invention.

[0030] Figure 7 This is a schematic diagram of the air guide regulating ring and adjustable air inlet assembly of the present invention;

[0031] Figure 8 This is a schematic diagram of the air guide regulating ring structure of the present invention;

[0032] Figure 9 for Figure 7 Enlarged view of point A in the middle;

[0033] Figure 10 This is a schematic diagram of the overall internal cross-sectional structure of the present invention;

[0034] Figure 11 This is a partial cross-sectional structural diagram of the adjustable pressure holding component and adjustable air inlet assembly of the present invention.

[0035] The attached diagram lists the components represented by each number as follows:

[0036] 100. Motor housing assembly; 110. Left base housing; 111. Top through slot; 112. Positioning slot one; 113. Insertion hole; 120. Right base housing; 121. Housing end; 122. Front cover; 123. Positioning slot two; 124. Threaded connection hole; 125. Heat dissipation outlet; 126. Central bearing one; 130. Rear cover; 131. Heat dissipation inlet; 132. Central bearing two;

[0037] 200. Stator assembly; 210. Stator core; 220. Positioning connector; 221. Retaining ring; 222. Connecting lug; 223. Guide slider; 230. Guide assembly; 231. Guide rod; 232. Threaded post end; 233. Inserted post end; 234. Disc spring;

[0038] 300. Rotor assembly; 310. Rotor core; 320. Motor shaft;

[0039] 400. Linear actuator;

[0040] 500. Air guide adjustment ring; 510. Annular support frame; 511. Support leg; 512. Outer ring; 513. Reinforcing bar; 514. Inner ring; 520. Adjustable pressure holding assembly; 521. Pressure holding arm; 522. Reinforcing rib; 523. Pressing shaft; 524. Sleeve;

[0041] 600 Adjustable air inlet assembly; 610 Mounting ring plate; 620 Square air guide duct; 630 Adjustable air vane assembly; 631 Air guide plate; 632 Hinge shaft; 633 Torsion spring; 634 Contact wedge; 635 Limit stop;

[0042] 700. Cooling fan. Detailed Implementation

[0043] 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.

[0044] This invention provides a technical solution: such as Figure 1 - Figure 11 The permanent magnet synchronous motor shown includes a motor housing assembly 100, a stator assembly 200, a rotor assembly 300, and a cooling fan 700. It also includes a linear actuator 400, an air guide adjustment ring 500, and an adjustable air intake assembly 600. The motor housing assembly 100 has an axial mounting cavity. The rotor assembly 300 is rotatably supported at the axial position of the cavity. The stator assembly 200 is slidably mounted in the cavity and coaxially sleeved on the outside of the rotor assembly 300. The linear actuator 400 is fixed on the top of the motor housing assembly 100, and its telescopic end passes through the housing and is fixedly connected to the stator assembly 200.

[0045] The stator assembly 200 is fixedly connected to the air inlet side with an air guide adjustment ring 500. The air guide adjustment ring 500 includes an annular support frame 510 and multiple sets of adjustment and holding assemblies 520 arranged circumferentially. The accommodating cavity is fixedly provided with an adjustable air inlet assembly 600. The adjustable air inlet assembly 600 includes a mounting ring plate 610, a circumferentially arranged square air guide pipe 620 and an adjustment air plate assembly 630 hinged in the pipe. The adjustment and holding assemblies 520 and the adjustment air plate assembly 630 are in contact and driven one by one.

[0046] The cooling fan 700 is mounted on the shaft of the rotor assembly 300 to generate airflow along the axial direction of the receiving cavity.

[0047] In some embodiments of the present invention, reference is made to... Figure 2 - Figure 5 As shown, the motor housing assembly 100 includes a left base housing 110, a right base housing 120, and a rear end cover 130. The left base housing 110 and the right base housing 120 are axially connected and fixed together. The rear end cover 130 is connected to the outer end of the left base housing 110. The three together enclose and form an installation cavity.

[0048] The left base housing 110 includes a top through slot 111, a positioning slot 112 and a plug hole 113. The top of the left base housing 110 has a top through slot 111, and the inner wall has an axially extending positioning slot 112. There are four sets of positioning slots 112, and each set of positioning slots 112 has a plug hole 113.

[0049] The right base housing 120 includes a housing end 121, a front cover 122, a second positioning groove 123, a threaded connection hole 124, a heat dissipation vent 125, and a central bearing 126. The inner wall of the housing end 121 is provided with a second positioning groove 123, and four sets of the second positioning groove 123 are provided. Each set of the second positioning groove 123 is provided with a threaded connection hole 124. The center of the front cover 122 is fitted with a central bearing 126, and the cover of the front cover 122 is provided with a heat dissipation vent 125.

[0050] The rear cover 130 has a central bearing 132 embedded in its center, and the cover body of the rear cover 130 has a heat dissipation air inlet 131.

[0051] In some embodiments of the present invention, reference is made to... Figure 6 and Figure 10 As shown, the stator assembly 200 includes a stator core 210, a positioning connecting frame 220, and a guide assembly 230. The positioning connecting frame 220 is fixedly sleeved on both ends of the outer circumferential surface of the stator core 210, and its top is fixedly connected to the telescopic end of the linear actuator 400. The guide assembly 230 is connected to the positioning connecting frame 220 and is installed in the positioning slot 112 and the positioning slot 223. The stator core 210 is axially movable in the motor housing assembly 100 through the cooperation of the positioning connecting frame 220 and the guide assembly 230. The stator winding lead wires of the stator assembly 200 are connected to the junction box of the motor housing assembly 100 through a flexible cable. The flexible cable is reserved with sufficient length to accommodate the axial movement stroke of the stator.

[0052] The positioning connection frame 220 includes a fixing ring 221, multiple connecting ears 222, and multiple guide sliders 223. The fixing ring 221 is coaxially fixed to both ends of the outer peripheral surface of the stator core 210. The connecting ears 222 are fixedly disposed on the outer wall of the fixing ring 221 and extend from the top through slot 111 to connect with the telescopic end of the linear actuator 400. The guide sliders 223 are fixed to the outer wall of the fixing ring 221 and positioned in the first positioning slot 112 and the second positioning slot 123.

[0053] The guide assembly 230 includes a guide rod 231, a threaded post end 232, a plug-in post end 233, and a disc spring 234. The guide rod 231 is movably inserted into the hole of the guide slider 223. The threaded post end 232 and the plug-in post end 233 are respectively fixedly disposed at both ends of the guide rod 231. The plug-in post end 233 is inserted into the plug-in hole 113. The threaded post end 232 is threadedly fixed in the threaded connection hole 124. The disc spring 234 is fitted on the end of the guide rod 231 where the plug-in post end 233 is disposed. The disc spring 234 abuts against the side of the guide slider 223 and the end of the positioning groove 112, providing an elastic preload force for the stator assembly 200 to return to the air outlet side.

[0054] In some embodiments of the present invention, reference is made to... Figure 6 and Figure 10 As shown, the rotor assembly 300 includes a rotor core 310 and a motor shaft 320. The rotor core 310 is fixedly sleeved on the middle section of the motor shaft 320. The two ends of the motor shaft 320 are rotatably supported in the central bearing 126 and the central bearing 132, respectively, to achieve circumferential rotation and axial positioning. The cooling fan 700 is fixedly sleeved on the section of the motor shaft 320 near the rear end cover 130.

[0055] In some embodiments of the present invention, reference is made to... Figure 7 - Figure 11 As shown, the annular support frame 510 includes a support leg 511, an outer ring 512, a reinforcing bar 513, and an inner ring 514. The outer ring 512 and the inner ring 514 are arranged coaxially at intervals. The reinforcing bar 513 is radially connected between the outer ring 512 and the inner ring 514. The support leg 511 is fixed to the end face of the outer ring 512 facing the stator assembly 200. The support leg 511 is fixedly connected to the end face of the stator core 210.

[0056] The adjusting pressure holding assembly 520 is evenly distributed circumferentially on the end faces of the outer ring 512 and the inner ring 514 facing the adjustable air inlet assembly 600. The adjusting pressure holding assembly 520 includes a pressure holding arm 521, a reinforcing rib 522, a pressing shaft 523, and a sleeve 524. The reinforcing rib 522 is fixed between the two sets of pressure holding arms 521 to enhance the structural strength. The pressing shaft 523 is fixed to the end of the pressure holding arm 521. The sleeve 524 is rotatably sleeved on the pressing shaft 523. The outer circumferential surface of the sleeve 524 rolls and abuts against the adjusting air plate assembly 630.

[0057] In some embodiments of the present invention, reference is made to... Figure 7 - Figure 11 As shown, the mounting ring plate 610 is coaxially fixed to the inner side wall of the rear end cover 130, and multiple square air guide pipes 620 are uniformly fixed on the plate body of the mounting ring plate 610 along the circumference, with each square air guide pipe 620 being axially continuous.

[0058] Each regulating vane assembly 630 is hinged to the side wall of a square air guide duct 620. Each regulating vane assembly 630 includes a guide vane 631, a hinge shaft 632, a torsion spring 633, a contact wedge 634, and a limiting stop 635. The guide vane 631 is hinged to the side wall of the square air guide duct 620 via the hinge shaft 632. The torsion spring 633 is sleeved on the hinge shaft 632, with its two ends abutting against the guide vane 631 and the inner wall of the square air guide duct 620, respectively, to drive the guide vane 631 to rotate and reset to the outside of the air guide duct. The contact wedge 634 is fixed. On the upper end face of the air guide plate 631, the limiting stop 635 is fixed to the top of the inclined surface of the contact wedge 634 to limit the maximum movement distance of the sleeve 524. The contact wedge 634 has an inclined abutment surface. The abutment surface of the contact wedge 634 gradually rises along the axial direction from the side near the stator assembly 200 to the side away from the stator assembly 200. The sleeve 524 of the adjusting pressure assembly 520 abuts against the abutment surface. The air guide plate 631 is driven to rotate through the inclined surface to reduce the flow area of ​​the square air guide duct 620 and increase the airflow velocity.

[0059] When the motor overheats, this invention drives the stator assembly 200 to shift axially via the linear actuator 400, reducing the axial coupling length between the stator core 210 and the rotor core 310. This reduces the motor's output torque and winding heating from the electromagnetic coupling perspective, suppressing temperature rise at its source. Simultaneously, the movement of the stator assembly 200 drives the air guide adjustment ring 500 to move, pushing the adjustment air vane assembly 630 to reduce the airflow area of ​​the square air guide duct 620, increasing the cooling airflow velocity and enhancing heat dissipation. The two dimensions work together to achieve efficient overheat protection without stopping the machine, ensuring continuous operation of the energy-saving motor and meeting the continuous production needs of energy-efficient industries.

[0060] Working principle:

[0061] When the motor is working normally, the temperature detection system detects that the stator winding temperature is within the rated safe range, the linear actuator 400 is in the retracted state, and the elastic force of the disc spring 234 pushes the stator assembly 200 to the right side of the frame housing 120. The stator core 210 and the rotor core 310 are axially fully coupled, the motor maintains rated power output, ensures efficient operation, and meets the energy efficiency requirements of energy-saving motors. It should be noted that the temperature detection system is existing technology.

[0062] At this time, the air guide adjustment ring 500 is located away from the rear end cover 130 along with the stator assembly 200. The contact force between the sleeve 524 of the adjustment holding component 520 and the contact wedge 634 is small. The elastic force of the torsion spring 633 drives the air guide plate 631 to open outward to the maximum angle. The square air guide tube 620 is in the fully open state. The cooling fan 700 rotates synchronously with the motor shaft 320. The outside air enters the motor after being rectified through the cooling air inlet 131 and the square air guide tube 620. It flows through the stator core 210, winding and rotor surface to carry away heat and finally exits from the cooling air outlet 125 to maintain the normal operating temperature of the motor.

[0063] When the motor operates under high load for a long time, and the temperature of the stator winding rises to the preset overheat protection threshold, the control system sends an extension command to the linear actuator 400. The extension end of the linear actuator 400 extends at a constant speed and pushes the stator assembly 200 to overcome the elastic force of the disc spring 234 through the connecting lug 222, and slides axially along the guide rod 231 toward the air inlet side.

[0064] On the one hand, the axial overlap length of the stator core 210 and the rotor core 310 gradually decreases, and the electromagnetic coupling between the two decreases synchronously. The motor output torque is automatically limited, and the heat generation is suppressed from the source.

[0065] On the other hand, the stator assembly 200 drives the air guide regulating ring 500 to move synchronously towards the air inlet side. The sleeve 524 of the regulating holding assembly 520 rolls along the abutting slope of the contact wedge 634, pushing the air guide plate 631 to overcome the elastic force of the torsion spring 633 and rotate around the hinge shaft 632 towards the inside of the square air guide duct 620, so that the flow cross-sectional area of ​​the square air guide duct 620 gradually decreases. The reduction of the air duct flow area significantly increases the flow velocity of the cooling airflow, enhances the convective heat transfer intensity, and can more quickly remove the heat from the surfaces of the stator assembly 200 and rotor assembly 300, accelerating the temperature drop.

[0066] Through the synergistic effect of electromagnetic load reduction and enhanced heat dissipation, the motor can quickly suppress temperature rise without stopping, achieving overheat protection, effectively ensuring the continuity of the production process, and meeting the continuous operation requirements of high-efficiency and energy-saving industries.

[0067] When the motor temperature drops back to the rated safe range, the control system issues a reset command. The extension end of the linear actuator 400 retracts at a constant speed, the disc spring 234 releases its elastic potential energy, and pushes the stator assembly 200 to slide and reset along the guide rod 231 toward the air outlet side. The stator core 210 and the rotor core 310 return to a fully coupled state, and the motor returns to its rated power for efficient operation, continuously outputting energy-saving power.

[0068] At the same time, the air guide adjustment ring 500 moves synchronously to the air outlet side with the stator, the pressure of the sleeve 524 against the contact wedge 634 gradually decreases, the torsion spring 633 releases its elastic force to drive the air guide plate 631 to rotate outward and reset, and the square air guide duct 620 returns to the fully open state.

[0069] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus.

[0070] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A permanent magnet synchronous motor with overheat protection function, comprising a motor housing assembly (100), a stator assembly (200), a rotor assembly (300), and a cooling fan (700), characterized in that: It also includes a linear actuator (400), an air guide adjustment ring (500), and an adjustable air intake assembly (600). The motor housing assembly (100) has an axial mounting cavity. The rotor assembly (300) is rotatably supported at the axial position of the cavity. The stator assembly (200) is slidably mounted in the cavity and coaxially sleeved on the outside of the rotor assembly (300). The linear actuator (400) is fixed on the top of the motor housing assembly (100), and its telescopic end passes through the housing and is fixedly connected to the stator assembly (200). The stator assembly (200) is fixedly connected to the air inlet side with an air guide adjustment ring (500). The air guide adjustment ring (500) includes an annular support frame (510) and multiple sets of adjustment and holding assemblies (520) arranged in the circumferential direction. An adjustable air inlet assembly (600) is fixedly provided on the air inlet side of the receiving cavity. The adjustable air inlet assembly (600) includes a mounting ring plate (610), a square air guide pipe (620) arranged in the circumferential direction, and an adjustment air plate assembly (630) hinged in the pipe. The adjustment and holding assemblies (520) and the adjustment air plate assemblies (630) abut against each other and drive each other. The cooling fan (700) is sleeved on the shaft of the rotor assembly (300) to generate airflow along the axial direction of the receiving cavity.

2. A permanent magnet synchronous motor with overheat protection function according to claim 1, characterized in that: The motor housing assembly (100) includes a left base housing (110), a right base housing (120), and a rear end cover (130). The left base housing (110) and the right base housing (120) are axially connected and fixed together. The rear end cover (130) is connected to the outer end of the left base housing (110). The three together form the mounting cavity. The left base housing (110) includes a top through slot (111), a positioning slot (112), and a plug hole (113). The top of the left base housing (110) is provided with a top through slot (111), and the inner wall is provided with an axially extending positioning slot (112). There are four sets of positioning slots (112), and each set of positioning slots (112) is provided with a plug hole (113). The right base housing (120) includes a housing end (121), a front cover (122), a second positioning groove (123), a threaded connection hole (124), a heat dissipation vent (125), and a first central bearing (126). The inner wall of the housing end (121) is provided with a second positioning groove (123), and four sets of the second positioning groove (123) are provided. Each set of the second positioning groove (123) is provided with a threaded connection hole (124). The first central bearing (126) is embedded in the center of the front cover (122), and the cover body of the front cover (122) is provided with a heat dissipation vent (125). The rear end cover (130) is fitted with a central bearing (132), and the cover body of the rear end cover (130) has a heat dissipation air inlet (131).

3. A permanent magnet synchronous motor with overheat protection function according to claim 2, characterized in that: The stator assembly (200) includes a stator core (210), a positioning connecting frame (220), and a guide component (230). The positioning connecting frame (220) is fixedly sleeved on both ends of the outer circumference of the stator core (210), and its top is fixedly connected to the telescopic end of the linear actuator (400). The guide component (230) is connected to the positioning connecting frame (220), and the guide component (230) is installed in the first positioning groove (112) and the second positioning groove (123). The stator core (210) can be axially moved and installed in the motor housing assembly (100) through the cooperation of the positioning connecting frame (220) and the guide component (230).

4. A permanent magnet synchronous motor with overheat protection function according to claim 3, characterized in that: The positioning connection frame (220) includes a fixing ring (221), multiple connecting ears (222) and multiple guide sliders (223). The fixing ring (221) is coaxially fixed to both ends of the outer circumferential surface of the stator core (210). The connecting ears (222) are fixedly disposed on the outer wall of the fixing ring (221) and extend from the top through slot (111) to connect with the telescopic end of the linear actuator (400). The guide sliders (223) are fixed to the outer wall of the fixing ring (221) and positioned in the first positioning slot (112) and the second positioning slot (123).

5. A permanent magnet synchronous motor with overheat protection function according to claim 4, characterized in that: The guide assembly (230) includes a guide rod (231), a threaded end (232), a plug-in end (233), and a disc spring (234). The guide rod (231) is movably inserted into the hole of the guide slider (223). The threaded end (232) and the plug-in end (233) are respectively fixed at both ends of the guide rod (231). The plug-in end (233) is inserted into the plug-in hole (113). The threaded end (232) is threadedly fixed in the threaded connection hole (124). The disc spring (234) is fitted on the end of the guide rod (231) where the plug-in end (233) is located. The disc spring (234) abuts against the side of the guide slider (223) and the end of the positioning groove (112), providing an elastic preload force for the stator assembly (200) to reset towards the air outlet side.

6. A permanent magnet synchronous motor with overheat protection function according to claim 5, characterized in that: The rotor assembly (300) includes a rotor core (310) and a motor shaft (320). The rotor core (310) is fixedly sleeved on the middle section of the motor shaft (320). The two ends of the motor shaft (320) are rotatably supported in the first central bearing (126) and the second central bearing (132) respectively, so as to realize circumferential rotation and axial positioning. The cooling fan (700) is fixedly sleeved on the section of the motor shaft (320) near the rear end cover (130).

7. A permanent magnet synchronous motor with overheat protection function according to claim 6, characterized in that: The annular support frame (510) includes a support leg (511), an outer ring (512), a reinforcing bar (513), and an inner ring (514). The outer ring (512) and the inner ring (514) are arranged coaxially at intervals. The reinforcing bar (513) is radially connected between the outer ring (512) and the inner ring (514). The support leg (511) is fixed to the end face of the outer ring (512) facing the stator assembly (200). The support leg (511) is fixedly connected to the end face of the stator core (210).

8. A permanent magnet synchronous motor with overheat protection function according to claim 7, characterized in that: The adjusting pressure holding assembly (520) is evenly distributed circumferentially on the end face of the outer ring (512) and inner ring (514) facing the adjustable air inlet assembly (600). The adjusting pressure holding assembly (520) includes a pressure holding arm (521), a reinforcing rib (522), a pressing shaft (523), and a sleeve (524). The reinforcing rib (522) is fixed between the two sets of pressure holding arms (521) to enhance the structural strength. The pressing shaft (523) is fixed at the end of the pressure holding arm (521). The sleeve (524) is rotatably sleeved on the pressing shaft (523). The outer circumferential surface of the sleeve (524) rolls and abuts against the adjusting air plate assembly (630).

9. A permanent magnet synchronous motor with overheat protection function according to claim 8, characterized in that: The mounting ring plate (610) is coaxially fixed to the inner side wall of the rear end cover (130), and a plurality of square air guide pipes (620) are uniformly fixed on the plate body of the mounting ring plate (610) along the circumference, and each square air guide pipe (620) is axially through.

10. A permanent magnet synchronous motor with overheat protection function according to claim 9, characterized in that: Each of the regulating air vane assemblies (630) is hinged to the side wall of a square air guide duct (620). The regulating air vane assembly (630) includes an air guide plate (631), a hinge shaft (632), a torsion spring (633), a contact wedge (634), and a limiting stop (635). The air guide plate (631) is hinged to the side wall of the square air guide duct (620) via the hinge shaft (632). The torsion spring (633) is sleeved on the hinge shaft (632), and its two ends abut against the air guide plate (631) and the inner wall of the square air guide duct (620) respectively, for driving the air guide plate. (631) Rotate and reset the outer side of the air duct. The contact wedge (634) is fixed to the upper end face of the air guide plate (631). The limiting stop (635) is fixed to the top of the inclined surface of the contact wedge (634) to limit the maximum movement distance of the sleeve (524). The contact wedge (634) has an inclined abutting surface. The sleeve (524) of the adjusting pressure holding assembly (520) abuts against the abutting surface. The air guide plate (631) is driven to rotate through the inclined surface to reduce the flow area of ​​the square air guide pipe (620) and increase the airflow velocity.

Images