AU2020201467B2

AU2020201467B2 - Permanent magnet outer rotor hoist

Info

Publication number: AU2020201467B2
Application number: AU2020201467A
Authority: AU
Inventors: Guijun GAO; Ziming KOU; Zhensheng Wang; Juan Wu; Deling Xie; Linan Zhang; Keliang Zhu; Lipeng Zhu
Original assignee: Taiyuan University of Technology; Guiyang Plateau Machinery Co Ltd
Current assignee: Taiyuan University of Technology; Guiyang Plateau Machinery Co Ltd
Priority date: 2019-12-24
Filing date: 2020-02-28
Publication date: 2021-07-01
Anticipated expiration: 2040-02-28
Also published as: ZA202001582B; AU2020201467A1; CN110943560A

Abstract

A permanent magnet outer rotor hoist is disclosed, including a main shaft fixed on the ground; a stator fixed on the main shaft; a roller encircling the main shaft from a circumferential direction of the main shaft and rotating relative to the main shaft; permanent magnets disposed on an inner wall of the roller and distributed along a circumferential direction of the inner wall of the roller, wherein the permanent magnets are uniformly distributed on the inner wall of the roller in a matrix form; and permanent magnet fixing blocks for limiting loosening of permanent magnets, wherein the permanent magnet fixing blocks include first fixing blocks for limiting permanent magnets from a circumferential direction and second fixing blocks for limiting permanent magnets from an axial direction, and the first fixing blocks and the second fixing blocks are orthogonal. The permanent magnet outer rotor hoist has higher safety and reliability. 23

Description

PERMANENT MAGNET OUTER ROTOR HOIST TECHNICAL FIELD

[ 0001] The disclosure relates to the field of mine equipment, and specifically relates to a permanent magnet outer rotor hoist.

BACKGROUND

[ 0002] A mine hoist is hoisting device for mine shaft capable of being widely applied to coal mines, metal mines and non-metal mines. However, at present, a mine hoist for a deep well has a higher failure rate and lower safety and reliability due to a large load and poor use conditions.

[ 0003] Throughout this specification the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps.

[ 0004] Any discussion of documents, acts, materials, devices, articles or the like which has been included in the present specification is not to be taken as an admission that any or all of these matters form part of the prior art base or were common general knowledge in the field relevant to the present disclosure as it existed before the priority date of each of the appended claims.

SUMMARY

[ 0005] Based on the above, the embodiments of the disclosure are expected to provide a mine hoist having higher safety and reliability or provide a useful alternative.

[ 0006] A permanent magnet outer rotor hoist, including:

[ 0007] a main shaft fixed on the ground;

[0008] a stator fixed on the main shaft;

[0009] a roller encircling the main shaft from a circumferential direction of the main shaft and rotating relative to the main shaft;

[ 0010] permanent magnets disposed on an inner wall of the roller and distributed along a circumferential direction of the inner wall of the roller, in which the permanent magnets are uniformly distributed on the inner wall of the roller in a matrix form; and

[ 0011] permanent magnet fixing blocks for limiting loosening of the permanent magnets, in which the permanent magnet fixing blocks include first fixing blocks for limiting the permanent magnets from a circumferential direction and second fixing blocks for limiting the permanent magnets from an axial direction, and the first fixing blocks and the second fixing blocks are orthogonal wherein both the first fixing blocks and the second fixing blocks are made of copper, wherein the permanent magnet outer rotor hoist further includes a cooling device for cooling the permanent magnets, the cooling device includes a cooling fan, and an air outlet of the cooling fan is connected to an inner cavity of the roller.

[ 0012] In the above solution, the permanent magnets are tile-shaped, four ends of the permanent magnets are wedge-shaped, and two ends of the permanent magnet fixing blocks are provided with wedge shapes complementary with the shapes of the four ends of the permanent magnets.

[ 0013] In the above solution, the inner wall of the roller further includes baffle rings for limiting axial positions of the permanent magnet fixing blocks, and the baffle rings are closely attached to two ends of the inner wall of the roller.

[ 0014] In the above solution, the cooling device further includes cooling air channels, one end of each of the cooling air channels is connected to the cooling fan, and the other end of each of the cooling air channels passes through an outer wall of the roller and enters the inner cavity of the roller.

[ 0015] In the above solution, the cooling device further includes temperature sensors for detecting temperatures of the permanent magnets, and the temperature sensors are electrically connected to the cooling fan.

[ 0016] In the above solution, the main shaft includes a wiring slot for containing lead wires of the stator, one end of the wiring slot axially penetrates to an end surface of one end of the main shaft along a center line of the main shaft, and the other end of the wiring slot penetrates out along a radial direction of the main shaft in a corresponding position of the stator.

[ 0017] In the above solution, the permanent magnet outer rotor hoist further includes a support seat for supporting two ends of the main shaft, the support seat includes a rhombic hole cooperating with the main shaft, and an outer circle at a cooperating part of the main shaft and the support seat is rhombic.

[ 0018] In the above solution, the rhombic hole includes a body and an upper cover closed in a radial direction, and the body and the upper cover are fixed through a detachable mode.

[ 0019] In the above solution, the stator adopts magnetic slot wedges, and two side surfaces of each of the magnetic slot wedges are provided with inclined surfaces convenient for inserting windings.

[ 0020] In the above solution, the stator adopts a short-distance distributed winding and a fractional slot structure.

[ 0021] In the above solution, the stator is a three-phase winding, and the three-phase winding adopts a Y-type connection method.

[ 0022] A permanent magnet outer rotor hoist according to the embodiments of the disclosure includes a main shaft fixed on the ground; a stator fixed on the main shaft; a roller encircling the main shaft from a circumferential direction of the main shaft and rotating relative to the main shaft; permanent magnets disposed on an inner wall of the roller and distributed along a circumferential direction of the inner wall of the roller, in which the permanent magnets are uniformly distributed on the inner wall of the roller in a matrix form; and permanent magnet fixing blocks for limiting loosening of the permanent magnets, in which the permanent magnet fixing blocks include first fixing blocks for limiting the permanent magnets from a circumferential direction and second fixing blocks for limiting the permanent magnets from an axial direction, and the first fixing blocks and the second fixing blocks are orthogonal. In the permanent magnet outer rotor hoist according to the embodiments of the disclosure, the permanent magnets are arranged on the inner wall of the roller in a matrix form, the positions of the permanent magnets are fixed from the circumferential directions and the axial directions of the permanent magnets through the first fixing blocks and the second fixing blocks respectively, the permanent magnets may be prevented from loosening or falling off under the condition of high temperature or large vibration, and there is no need to perforate the permanent magnets, thereby reducing the failure rate of the permanent magnet outer rotor hoist and obtaining higher safety and reliability.

[ 0023] Other beneficial effects of the embodiments of the disclosure will be further described in specific implementations in combination with specific technical solutions.

BRIEF DESCRIPTION OF THE DRAWINGS

[ 0024] In order to more clearly illustrate the technical solutions in the embodiments of the disclosure, the drawings required for description of the embodiments will be briefly described below. It should be understood that the drawings described below are only a part of drawings of the embodiments of the disclosure. Those skilled in the art may further obtain other drawings according to these drawings without any creative work.

[ 0025] FIG. 1 is a schematic diagram of a permanent magnet outer rotor hoist provided by embodiments of the disclosure.

[ 0026] FIG. 2 is a schematic diagram of a right side view of FIG. 1.

[ 0027] FIG. 3 is a schematic diagram of a fixing structure of permanent magnets in a permanent magnet outer rotor hoist provided by embodiments of the disclosure.

[ 0028] FIG. 4 is a schematic diagram of a main shaft in a permanent magnet outer rotor hoist provided by embodiments of the disclosure.

[ 0029] FIG. 5 is a schematic diagram of a support seat in a permanent magnet outer rotor hoist provided by embodiments of the disclosure.

[ 0030] FIG. 6 is a schematic diagram of magnetic slot wedges in a permanent magnet outer rotor hoist provided by embodiments of the disclosure.

[ 0031] FIG. 7 is a schematic diagram of change in cogging torque after magnetic slot wedges are disposed in a permanent magnet outer rotor hoist provided by embodiments of the disclosure.

[ 0032] FIG. 8 is a schematic diagram of a winding expanded view of a stator in a permanent magnet outer rotor hoist provided by embodiments of the disclosure.

DETAILED DESCRIPTION

[ 0033] In an invention patent "Permanent Magnet Synchronous Direct Drive Device For Coal Mine Hoist" (Application Number: ZL201811571686.4), a reducing motor is adopted to drive a transmission shaft to rotate, simultaneously, a driving motor drives a rotating shaft to rotate, and a driven gear and the transmission shaft are driven to rotate through the transmission of a driving gear and a chain, thereby enhancing an output torque of the transmission shaft. When the device is applied to a mine hoist, the transmission structure is complicated, the transmission efficiency is low, the floor area is large, the reliability is not high, and the motors may not implement ultra-low-frequency starting and low-speed and large-torque operation. A high-speed bearing having high cost, relatively short service life and high maintenance cost must be used. The driving motor and the reducing motor have larger harmonics, higher energy loss and more generated heat.

[0034] In a utility model patent "Permanent Magnet Motor Mine Hoist" (Application Number: ZL201020541486.7), a coupling is adopted to connect a permanent magnet motor and a hoist drum. This structure omits a speed reducer. However, because the structure adopts the coupling, higher requirements are proposed for mounting and centering, and the floor area is larger.

[0035] In an invention patent "Built-in Outer Rotor Permanent Magnet Motor Direct Drive Mine Hoist" (Application Number: ZL201310196130.2), a stator of a permanent magnet motor is sleeved on a main shaft of a hoist through a stator support structure, and support and positioning are implemented by inner bearings at left and right sides; an outer rotor drum of the permanent magnet motor and the main shaft of the hoist are supported and fixed by an outer bearing, and the outer bearing is a self-aligning bearing; and the outer rotor of the permanent magnet motor is connected to the stator of the permanent magnet motor through a flexible connection mechanism. In this structure, each of the outer rotor and the stator is sleeved with the main shaft through two bearings, so that processing and mounting errors of the outer rotor and the stator are larger, the requirement for adjustment accuracy is high, and the adjustment amount is large.

[0036] In an invention patent "Large Permanent Magnet Built-in Mine Friction Hoist" (Application Number: ZL201810286911.3), a main shaft of a motor is provided with axial through holes for cable arrangement and water cooling pipelines, the axial through holes are relatively difficult to process and higher in cost, and a water inlet pipe hole and a water return hole have a weakening effect on the strength of the main shaft. A middle part of the main shaft of the motor is fixedly connected with a support frame, and a stator is mounted on the support frame. That is, the main shaft of the motor and the support frame are of a split structure. Fixed connection may be performed by special tooling clamps, thereby causing the defects of complicated mounting processes, inconvenient disassembly, higher requirement for processing accuracy, and the like. Furthermore, due to poor strength, cracks are easily generated under the action of sudden loads, thereby bringing great hidden dangers to safe operation of the mine hoist.

[0037] In an invention patent "Permanent Magnet Direct Drive Built-in Hoist" (Application Number: ZL201810008298.9), permanent magnets are fixedly disposed on an inner circumferential surface of an auxiliary sleeve through bolts, and an outer circumferential surface of the auxiliary sleeve is fixed on an inner wall of a drum through a plurality of rib plates. The permanent magnets have large brittleness and general machining performance, so that processes for perforating the permanent magnets are complicated. During working, because the permanent magnets have large brittleness, it is easy to cause cracks, and it is easy to cause safety accidents of the hoist. On the other hand, the drum is connected with a web plate, the web plate is connected with a flange sleeve, an inner ring of the flange sleeve cooperates with an outer ring of a bearing, an inner ring of the bearing cooperates with an outer ring of a flange, and finally, an inner ring of the flange cooperates with a main shaft to form a connection. In summary, the hole and shaft cooperating relationship among the flange sleeve, the bearing, the flange and the main shaft is complicated, the requirement for processing accuracy of the flange sleeve, the flange and the main shaft is high, and assembly processes are complicated. Because an inner bearing is inconvenient to maintain, if any one of the flange sleeve, the bearing and the flange is worn and needs to be maintained, assembly and disassembly are inconvenient, and the maintenance workload is large.

[ 0038] In view of the above problems, the embodiments of the disclosure provide a permanent magnet outer rotor hoist, including:

[ 0039] a main shaft fixed on the ground;

[ 0040] a stator fixed on the main shaft;

[ 0041] a roller encircling the main shaft from a circumferential direction of the main shaft and rotating relative to the main shaft;

[ 0042] permanent magnets disposed on an inner wall of the roller and distributed along a circumferential direction of the inner wall of the roller, in which the permanent magnets are uniformly distributed on the inner wall of the roller in a matrix form; and

[ 0043] permanent magnet fixing blocks for limiting loosening of the permanent magnets, in which the permanent magnet fixing blocks include first fixing blocks for limiting the permanent magnets from a circumferential direction and second fixing blocks for limiting the permanent magnets from an axial direction, and the first fixing blocks and the second fixing blocks are orthogonal

[ 0044] wherein both the first fixing blocks and the second fixing blocks are made of copper,

[ 0045] wherein the permanent magnet outer rotor hoist further comprises a cooling device for cooling the permanent magnets, the cooling device comprises a cooling fan, and an air outlet of the cooling fan is connected to an inner cavity of the roller.

[ 0046] The permanent magnet outer rotor hoist according to the embodiments of the disclosure is a mine hoist using the principles of a permanent magnet outer rotor motor, has the characteristics of ultra-low-frequency smooth starting, low-speed and large torque operation and the like, and has high motor efficiency.

[ 0047] Here, the main shaft is fixed on the ground or other fixed facilities on the ground and is stationary, and the stator is mounted on the main shaft and is also stationary. The roller rotates relative to the main shaft, the permanent magnets are mounted on the inner wall of the roller, and the rotation of the roller relative to the main shaft is the rotation of the rotor relative to the stator. The roller is wound with a hoisting rope, and the rotation of the roller may realize the purposes of retracting and releasing the steel wire rope, thereby hoisting an underground hoisting object.

[ 0048] Here, the permanent magnet fixing blocks may be fixed on the inner wall of the roller by screws, that is, the permanent magnet fixing blocks need to be perforated, so that it is possible to avoid perforation in the permanent magnets.

[ 0049] In the permanent magnet outer rotor hoist according to the embodiments of the disclosure, the permanent magnets are arranged on the inner wall of the roller in a matrix form, the positions of the permanent magnets are fixed from the circumferential directions and the axial directions of the permanent magnets through the first fixing blocks and the second fixing blocks respectively, the permanent magnets may be prevented from loosening or falling off under the condition of high temperature or large vibration, and there is no need to perforate the permanent magnets, thereby reducing the failure rate of the permanent magnet outer rotor hoist and obtaining higher safety and reliability.

[ 0050] Further, the permanent magnets are uniformly distributed on the inner wall of the inner ring in a matrix form. In this way, the permanent magnets may provide a constant-excitation intense magnetic field to obtain higher motor efficiency so as to increase the operating efficiency of the permanent magnet outer rotor hoist, which is a better implementation.

[ 0051] In other embodiments of the disclosure, the permanent magnets are tile-shaped, four ends of the permanent magnets are wedge-shaped, and two ends of the permanent magnet fixing blocks are provided with wedge shapes complementary with the shapes of the four ends of the permanent magnets. The tile shape aims to better fit the roller, and the wedge shape aims to limit more degrees of freedom of the permanent magnets (axial and circumferential degrees of freedom of the permanent magnets as well as radial degrees of freedom of the permanent magnets) to realize firmer fixation, which is a better implementation.

[ 0052] The copper is a non-magnetic conduction material capable of effectively performing magnetic isolation between magnetic poles to enable magnetic lines to pass through the wall of the roller, thereby avoiding magnetic leakage to obtain higher motor efficiency so as to increase the operating efficiency of the permanent magnet outer rotor hoist, which is a better implementation.

[ 0053] In other embodiments of the disclosure, the inner wall of the roller further includes baffle rings for limiting axial positions of the permanent magnet fixing blocks, and the baffle rings are closely attached to two ends of the inner wall of the roller. Because the baffle rings surround the roller, the positions of the permanent magnets may be further fixed, which is a better implementation. Note: one of the baffle rings at two ends is mounted after all permanent magnets are fixed.

[ 0054] The permanent magnet outer rotor hoist generates a large amount of heat during operating so that the temperature of the motor is increased, and the excessive temperature may demagnetize the permanent magnets. Therefore, the cooling device is disposed to greatly reduce the failure rate, which is a better implementation.

[ 0055] In other embodiments of the disclosure, the cooling device further includes cooling air channels, one end of each of the cooling air channels is connected to the cooling fan, and the other end of each of the cooling air channels passes through an outer wall of the roller and enters an inner cavity of the roller. In this way, the air strength of the cooling fan is more concentrated, and the cooling fan may be disposed outside the roller to obtain a good cooling effect and simplify the structure, which is a better implementation.

[ 0056] Specifically, two cooling air channels are respectively disposed at the outer side of the main shaft in parallel. In this way, on the one hand, the main shaft may be prevented from being perforated, so that the strength of the main shaft is ensured, and the strength of the main shaft is higher; and on the other hand, the two cooling air channels are independent of the main shaft and have a large cross-sectional area, so that the cooling efficiency is ensured, and the temperature may be quickly reduced.

[ 0057] In other embodiments of the disclosure, the cooling device further includes temperature sensors for detecting temperatures of the permanent magnets, and the temperature sensors are electrically connected to the cooling fan. In this way, the surface temperatures of the permanent magnets exceed a preset temperature, and the cooling fan is automatically started to save more energy, which is a better implementation. The preset temperature is related to the demagnetization temperatures of the permanent magnets, and there are different values according to different permanent magnets, which are not specifically limited.

[ 0058] In other embodiments of the disclosure, the main shaft includes a wiring slot for containing lead wires of a stator, one end of the wiring slot axially penetrates to an end surface of one end of the main shaft along a center line of the main shaft, and the other end of the wiring slot penetrates out along a radial direction of the main shaft in a corresponding position of the stator. The mode of forming the wiring slot in the center line of the main shaft minimizes the influence of the wiring slot on the strength of the main shaft to enable the strength of the main shaft to be higher, which is a better implementation.

[ 0059] In other embodiments of the disclosure, the permanent magnet outer rotor hoist further includes a support seat for supporting two ends of the main shaft, the support seat includes a rhombic hole cooperating with the main shaft, and an outer circle at a cooperating part of the main shaft and the support seat is rhombic. The main shaft may be well fixed through the mode of the rhombic hole to avoid following rotation, which is a better implementation.

[0060] In other embodiments of the disclosure, the rhombic hole includes a body and an upper cover closed in a radial direction, and the body and the upper cover are fixed through a detachable mode. In this way, the structure is simpler, and it is easier to mount the main shaft, which is a better implementation.

[0061] In other embodiments of the disclosure, the stator adopts magnetic slot wedges, and two side surfaces of each of the magnetic slot wedges are provided with inclined surfaces convenient for inserting windings. The magnetic slot wedges have higher relative permeability and better magnetic permeability, and may increase the effective cross-sectional area of punching teeth of a stator core. Air gap magnetic permeability change caused by a stator slot opening is reduced, and the air gap magnetic density distribution of the motor is more uniform. The harmonic content in air gaps and the cogging torque of the motor are effectively weakened, and vibration and noise caused by an air gap magnetic field are improved. Furthermore, the loss may be reduced, the temperature rise may be reduced, the working efficiency may be increased, and ultra low-frequency smooth starting and low-speed and large-torque operation of the permanent magnet outer rotor hoist may also be better implemented, so it is a better implementation.

[0062] The two side surfaces of each of the magnetic slot wedges are provided with the inclined surfaces convenient for inserting windings, so that on the one hand, the insertion is facilitated; and on the other hand, the magnetic slot wedges are in oblique surface contact with notches instead of point contact, thereby increasing the contact area, and being favorable for preventing wear and falling caused by vibration under the action of electromagnetic force.

[0063] In other embodiments of the disclosure, the stator adopts a short-distance distributed winding and a fractional slot structure. In this way, higher harmonics of the winding of the stator core may be effectively weakened to ensure that harmonics of the motor are minimized as much as possible, the energy loss is low, the generated heat is less, and ultra-low-frequency smooth starting and low-speed and large-torque operation of the permanent magnet outer rotor hoist may also be better implemented, so it is a better implementation.

[ 0064] In other embodiments of the disclosure, the stator is a three-phase winding, and the three-phase winding adopts a Y-type connection method. In this way, triple sub harmonics (triple frequency) may be eliminated. Harmonics of the motor may be minimized as much as possible, the energy loss is low, the generated heat is less, and ultra-low-frequency smooth starting and low-speed and large-torque operation of the permanent magnet outer rotor hoist may also be better implemented, so it is a better implementation.

[ 0065] In order to understand the disclosure more clearly, the disclosure is further described in detail below with reference to the drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely configured to illustrate the disclosure, but are not intended to limit the disclosure. Furthermore, the embodiments described below are only a part of the embodiments of the disclosure, but are not all of the embodiments. According to these embodiments, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the embodiments of the disclosure.

[ 0066] As shown in FIG. 1 to FIG. 3, the embodiments of the disclosure provide a permanent magnet outer rotor hoist. The permanent magnet outer rotor hoist includes a main shaft 100, a stator 200, a roller 300, permanent magnets 400 and permanent magnet fixing blocks. The main shaft 100 is fixed on the ground. The stator 200 is mounted on the main shaft 100. The roller 300 encircles the main shaft 100 from a circumferential direction of the main shaft 100 and rotates relative to the main shaft 100. The permanent magnets 400 are disposed on an inner wall of the roller 300 and distributed along a circumferential direction of the inner wall of the roller 300, and the permanent magnets 400 are uniformly distributed on the inner wall of the roller 300 in a matrix form. The permanent magnet fixing blocks are configured to limit loosening of the permanent magnets 400, the permanent magnet fixing blocks include first fixing blocks 501 for limiting the permanent magnets 400 from a circumferential direction and second fixing blocks 502 for limiting the permanent magnets 400 from an axial direction, and the first fixing blocks 501 and the second fixing blocks 502 are orthogonal.

[ 0067] In the present embodiment, the permanent magnets 400 are tile-shaped, four ends of the permanent magnets 400 are wedge-shaped, and two ends of the permanent magnet fixing blocks are provided with wedge shapes complementary with the shapes of the four ends of the permanent magnets 400. Thus, more degrees of freedom of the permanent magnets 400 may be limited.

[ 0068] In the present embodiment, both the first fixing blocks 501 and the second fixing blocks 502 are made of copper.

[ 0069] In the present embodiment, the inner wall of the roller 300 further includes baffle rings for limiting axial positions of the permanent magnet fixing blocks, and the baffle rings 301 are closely attached to two ends of the inner wall of the roller 300.

[ 0070] Specifically, the permanent magnet fixing blocks may be fixed on the inner wall of the roller 300 by screws 503. The baffle rings 301 may be fixed on the inner wall of the roller 300 by screws, or may be integrally formed with the roller 300.

[ 0071] Specific processes for fixing a permanent magnet 400 are as follows:

[ 0072] 1) a baffle ring 301 at one end of the roller 300 is fixed on the inner wall of the roller 300 by screws, and if the baffle ring 301 is integrally formed with the roller 300, this step is not performed;

[ 0073] 2) a first fixing block 501 and a second fixing block 502 are fixed on the inner wall of the roller 300 by screws 503, the first fixing block 501 and the second fixing block 502 abut against each other perpendicularly, and the heads of the screws 503, namely thread sections, may be coated with adhesives to prevent the screws from loosening;

[ 0074] 3) the permanent magnet 400 is coated with an adhesive so as to be pasted on the inner wall of the roller 300, and two mutually perpendicular ends of the permanent magnet 400 abut against the fixed first fixing block 501 and second fixing block 502 respectively;

[ 0075] 4) the fixed permanent magnet 400 is slightly hammered with a wood hammer or a rubber hammer to enable the permanent magnet 400 to be pasted more firmly;

[ 0076] 5) a first fixing block 501 and a second fixing block 502 are fixed around the other two ends of the permanent magnet 400 so as to completely limit the periphery of the permanent magnet 400;

[ 0077] 6) a gap between the permanent magnet 400 and a permanent magnet fixing block is also coated with an adhesive to enable the permanent magnet 400 to be fixed more firmly; and

[ 0078] 7) a baffle ring 301 at the other end of the roller 300 is fixed on the inner wall of the roller 300 by screws, and if the baffle ring 301 is integrally formed with the roller 300, this step is not performed.

[ 0079] FIG. 3 shows a structure after the permanent magnets 400 are mounted.

[ 0080] Further, in the present embodiment, permanent magnet fixing rings 302 for mounting the permanent magnets are fixed on the inner wall of the roller. Thus, the permanent magnet fixing rings 302 may be processed separately, the cylindricalness, roundness and roughness of an inner circle pasted with the permanent magnets are all processed very well to enable the permanent magnets to be fixed more firmly, the processing technology of the roller is also simplified, and the cost is lowered.

[ 0081] In the present embodiment, as shown in FIG. 1, the permanent magnet outer rotor hoist also includes a cooling device for cooling the permanent magnets 400, the cooling device includes a cooling fan 601, and an air outlet of the cooling fan 601 is connected to an inner cavity of the roller 300.

[ 0082] In the present embodiment, the cooling device also includes two cooling air channels 602 parallel to the main shaft 100, one end of each of the two cooling air channels 602 is connected to the cooling fan 601, and the other end of each of the two cooling air channels 602 passes through an outer wall of the roller 300 and enters the inner cavity of the roller 300. Arrows in FIG. 1 indicate flow directions of cooling air.

[0083] In the present embodiment, the cooling device further includes temperature sensors (not shown) for detecting temperatures of the permanent magnets 400, and the temperature sensors are electrically connected to the cooling fan 601. Thus, when the surface temperatures of the permanent magnets 400 exceed the preset temperature, the cooling fan 601 is automatically started. Specifically, the temperature sensors include multiple groups of high-performance temperature sensors PT100; when the surface temperatures of the permanent magnets 400 reach 60°C, an instruction is automatically sent to start the cooling fan 601; and if the surface temperatures of the permanent magnets 400 are still higher than 85°C after this hoisting, the next hoisting is stopped, and the next hoisting is continued after the temperatures decrease so as to prevent high temperature demagnetization.

[ 0084] Further, the present embodiment further designs a corresponding technical solution for heavy current demagnetization. That is, by selecting the materials or manufacturing processes of the permanent magnets 400, a value of each of the demagnetization currents of the permanent magnets 400 is designed to be greater than five times of a value of the rated current of a motor, and the maximum current of a driving device for supplying power is designed to be 2 times the rated current of the motor. Thus, the permanent magnets 400 have sufficient demagnetization safety factors to prevent heavy current demagnetization.

[ 0085] In the present embodiment, the permanent magnets 400 are formed by sintering a high-performance rare earth material neodymium iron boron at a high temperature, the neodymium iron boron has a high magnetic energy product, and the motor performance may be improved, thereby increasing the operating efficiency of the permanent magnet outer rotor hoist.

[ 0086] Further, when the permanent magnet outer rotor hoist encounters a sudden power failure during use, the permanent magnet outer rotor hoist decelerates to reversely operate under the action of a load torque, that is, under the action of gravity of an underground hoisting object, the hoisting object falls downward, and the motor of the permanent magnet outer rotor hoist enters a generator operating state. Specifically, at this time, a magnetic field of the permanent magnets 400 cuts the windings of the stator 200 to generate a current so as to generate an electromagnetic field, and the electromagnetic field generates resistance to the rotational motion of the permanent magnets 400 so as to generate a braking effect, so that the reverse rotation speed of the permanent magnet outer rotor hoist is maintained at a certain value, which will not cause the hoisting object to quickly fall due to an acceleration of gravity so as to avoid safety accidents.

[0087] In the present embodiment, as shown in FIG. 4, the main shaft 100 includes a wiring slot 101 for containing lead wires 201 of the stator, one end of the wiring slot 101 axially penetrates to an end surface of one end of the main shaft 100 along a center line of the main shaft 100, and the other end of the wiring slot 101 penetrates out along a radial direction of the main shaft 100 in a corresponding position of the stator 200.

[0088] In the present embodiment, as shown in FIG. 4, the main shaft 100 further includes two flanges 103, and the flanges 103 and the main shaft 100 are formed in the same blank to limit a stator core 203. Compared with a traditional permanent magnet outer rotor hoist in which flanges 103 and a main shaft 100 are of a split structure and the flanges 103 are connected to the main shaft 100 in a mode of key interference fit, the permanent magnet outer rotor hoist disclosed by the present embodiment has the advantages of simple mounting, few technological processes and low requirement for processing accuracy, and avoids the problems that cracks are easily generated at joints between the flanges 103 and the main shaft 100, the motor is damaged and even safety accidents of the permanent magnet outer rotor hoist are caused. Therefore, the permanent magnet outer rotor hoist disclosed by the present embodiment is safer and more stable.

[0089] In the present embodiment, as shown in FIG. 5, the permanent magnet outer rotor hoist also includes a support seat 700 for supporting two ends of the main shaft 100, the support seat 700 includes a rhombic hole cooperating with the main shaft 100, and an outer circle at a cooperating part of the main shaft 100 and the support seat 700 is a rhombic section 105.

[0090] In the present embodiment, the rhombic hole includes a body 701 and an upper cover 702 closed in a radial direction, and the body 701 and the upper cover 702 are fixed through a detachable mode. The support seat 700 adopts a split structure, that is, the support seat 700 is split into an upper half and a lower half (the body 701 and the upper cover 702) along an axial direction in a position provided with the main shaft 100. After the main shaft 100 is mounted, the upper half and the lower half are closed to fix the main shaft 100.

[0091] In the present embodiment, the roller 300 is rolled by an entire steel plate at one time, thereby ensuring a small roundness error and ensuring that bonding surfaces fit without gaps. An integral annealing process is adopted to eliminate the residual stress, ensure the size stability of the roller 300, and greatly reduce the deformation of the roller 300. The steel plate generally adopts a high-strength steel plate, such as high-quality medium carbon steel, alloy steel and the like. In conclusion, the roller 300 is not only accurate and stable in size, but also high in strength.

[ 0092] Specifically, the processing technology of the roller 300 includes: firstly, a steel plate before processing is subjected to chemical analysis and ultrasonic flaw detection to detect whether the selected steel plate has defects or not; after passing the detection, oxygen-acetylene cutting, rolling and welding are performed, and then, flaw detection is performed again; after passing the detection, rolling is performed, and then, an integral annealing process is performed to eliminate the residual stress, ensure the size stability of the roller 300, and greatly reduce the deformation of the roller 300; and finally, a series of processes of shot blasting, rust protection, rough static processing and the like are performed to complete processing.

[ 0093] In the present embodiment, the main shaft 100 is integrally forged from steel and is subjected to non-destructive flaw detection twice and mechanical performance testing, thereby ensuring that the main shaft 100 is better in strength, rigidity and flexibility and more stable in performance.

[ 0094] In the present embodiment, double-row tapered roller bearings are mounted at both ends of the main shaft. When the roller rotates under a load, the double-row tapered roller bearings may bear a greater radial force.

[ 0095] In the present embodiment, an end surface of one end of the roller is further provided with a brake disc 303. When braking is required, the brake disc 303 is pressed by a brake block with a large friction force, the braking is implemented via friction force, the structure is simple, and the braking effect is good.

[0096] In the present embodiment, the stator core 203 is fixed on the main shaft 100 through stator support frames 205. Because the roller is larger, in order to ensure reasonable air gaps, an outer circle and an inner hole of the stator core 203 are larger, and the structure of the stator core may be simplified by fixing the stator core through the support frames.

[0097] In the present embodiment, the stator 200 adopts magnetic slot wedges 206, and two side surfaces of each of the magnetic slot wedges 206 are provided with inclined surfaces convenient for inserting windings. Specifically, the mounting is implemented via pressure or impact force; during mounting, the bottoms of the magnetic slot wedges 206 must be padded, then two sides of a notch wall are coated with adhesives by a hair brush, and then, the magnetic slot wedges are mounted; and after mounting, the ends of the magnetic slot wedges 206 are not damaged or broken. FIG. 6 is a schematic diagram showing that the magnetic slot wedges 206 are mounted in the stator 200. FIG. 7 shows an improvement on a cogging torque after the magnetic slot wedges 206 are mounted. The windings in the figure are divided into coil upper layer edges 207 and coil lower layer edges 208, and the magnetic slot wedges 206 are directly attached to the tops of the coil upper layer edges 207.

[ 0098] In the present embodiment, the stator 200 adopts a short-distance distributed winding and a fractional slot structure. The coiling mode of the stator 200 in the present embodiment is as shown in FIG. 8. It can be seen from FIG. 8 that the motor of the present embodiment is a three-phase motor, the wiring points of the three-phase winding are Ul, U2, VI, V2, W and W2 respectively, and the stator core 203 has 24 coiling slots in total. Magnetic poles of the rotor are divided into two groups, namely Ni\SI and N2\S2.

[ 0099] Further, the three-phase winding adopts a Y-type connection method.

[ 00100] In the description of the embodiments of the disclosure, unless otherwise stated and limited, the term "connection" should be understood in a broad sense. For example, the connection may be electrical connection, or internal connection between two components, or direct connection, or indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above term may be understood according to specific situations.

[00101] In the embodiments of the disclosure, if the term "first\second\third" is involved, it only distinguishes similar objects, and does not represent a specific ordering of objects. It can be understood that the "first\second\third" may be interchanged in a specific order or a precedence order if allowed.

[00102] It should be understood that "an embodiment" or "some embodiments" mentioned throughout the specification means that specific features, structures or characteristics related to the embodiments are included in at least one embodiment of the disclosure. Thus, the appearances of "in one embodiment" or "in some embodiments" throughout the specification are not necessarily referring to the same embodiment. Furthermore, these specific features, structures or characteristics may be combined in one or more embodiments in any suitable mode. It should be understood that in various embodiments of the disclosure, the size of the serial number of each of the above processes does not mean an execution order. The execution order of each process should be determined by its functions and internal logics, and should not constitute any limitation on the implementation processes of the embodiments of the disclosure. The serial numbers of the above embodiments of the disclosure are merely for description, and do not represent the superiority or inferiority of the embodiments.

[00103] The embodiments described above are merely preferred embodiments of the disclosure, and are not intended to limit the protection scope of the disclosure. Any modification, equivalent replacement and improvement made within the spirit and principle of the disclosure are intended to be included within the protection scope of the disclosure.

Claims

1. A permanent magnet outer rotor hoist, comprising:

a main shaft fixed on the ground;

a stator fixed on the main shaft;

a roller encircling the main shaft from a circumferential direction of the main shaft and rotating relative to the main shaft;

permanent magnets disposed on an inner wall of the roller and distributed along a circumferential direction of the inner wall of the roller, wherein the permanent magnets are uniformly distributed on the inner wall of the roller in a matrix form; and

permanent magnet fixing blocks for limiting loosening of the permanent magnets, wherein the permanent magnet fixing blocks comprise first fixing blocks for limiting the permanent magnets from a circumferential direction and second fixing blocks for limiting the permanent magnets from an axial direction, and the first fixing blocks and the second fixing blocks are orthogonal

wherein both the first fixing blocks and the second fixing blocks are made of copper,

wherein the permanent magnet outer rotor hoist further comprises a cooling device for cooling the permanent magnets, the cooling device comprises a cooling fan, and an air outlet of the cooling fan is connected to an inner cavity of the roller.

2. The permanent magnet outer rotor hoist of claim 1, wherein the permanent magnets are tile shaped, four ends of the permanent magnets are wedge-shaped, and two ends of the permanent magnet fixing blocks are provided with wedge shapes complementary with the shapes of the four ends of the permanent magnets.

3. The permanent magnet outer rotor hoist of claim 1 or 2, wherein the inner wall of the roller further comprises baffle rings for limiting axial positions of the permanent magnet fixing blocks, and the baffle rings are closely attached to two ends of the inner wall of the roller.

4. The permanent magnet outer rotor hoist of claim 1 2, or 3, wherein the cooling device further comprises cooling air channels, one end of each of the cooling air channels is connected to the cooling fan, and the other end of each of the cooling air channels passes through an outer wall of the roller and enters the inner cavity of the roller.

5. The permanent magnet outer rotor hoist of any of the preceding claims, wherein the cooling device further comprises temperature sensors for detecting temperatures of the permanent magnets, and the temperature sensors are electrically connected to the cooling fan.

6. The permanent magnet outer rotor hoist of any preceding claim, wherein the main shaft comprises a wiring slot for containing lead wires of the stator, one end of the wiring slot axially penetrates to an end surface of one end of the main shaft along a center line of the main shaft, and the other end of the wiring slot penetrates out along a radial direction of the main shaft in a corresponding position of the stator.

7. The permanent magnet outer rotor hoist of any preceding claim, wherein the permanent magnet outer rotor hoist further comprises a support seat for supporting two ends of the main shaft, the support seat comprises a rhombic hole cooperating with the main shaft, and an outer circle at a cooperating part of the main shaft and the support seat is rhombic.

8. The permanent magnet outer rotor hoist of claim 7, wherein the rhombic hole comprises a body and an upper cover closed in a radial direction, and the body and the upper cover are fixed through a detachable mode.

9. The permanent magnet outer rotor hoist of any of the preceding claims, wherein the stator adopts magnetic slot wedges, and two side surfaces of each of the magnetic slot wedges are provided with inclined surfaces convenient for inserting windings.

10. The permanent magnet outer rotor hoist of any of the preceding claims, wherein the stator adopts a short-distance distributed winding and a fractional slot structure.

11. The permanent magnet outer rotor hoist of any of the preceding claims, wherein the stator is a three-phase winding, and the three-phase winding adopts a Y-type connection method.

1 /8 FIG. 1

2 /8 FIG. 2

503

502 2020201467

501

400

FIG. 3

3 /8

4 /8 FIG. 4

/8 FIG. 5

206 207 208 203 2020201467

FIG. 6

6 /8

7 /8 FIG. 7

8 /8 FIG. 8