Switched Reluctance Motor, Fan and Hand Dryer

Abstract

The present invention relates to a switched reluctance motor, a blower and a hand dryer, comprising: a housing, an end cover mating with the housing, a stator assembly disposed within the housing, and a rotor assembly installed inside the stator assembly and located between the housing and the end cover; wherein a first bearing chamber adapted to be assembled with a rear bearing on the rotor assembly is provided at the bottom of the housing; a second bearing chamber adapted to be assembled with a front bearing on the rotor assembly is provided at the center of the end cover; and a detecting element is further provided at one end of the stator assembly close to the end cover, and a measured component adapted to be detected by the detecting component is further provided on the rotor shaft of the rotor assembly. The present invention does not require the use of permanent magnetic materials, so the manufacturing process of the overall product system is simple and the processing cost is low.

Description

Technical Field

[0001] The present invention relates to the technical field of electrical appliances, and more particularly, to a switched reluctance motor, a blower, and a hand dryer. Background Art

[0002] Hand dryers are mainly used in occasions such as hotels, restaurants, research institutions, hospitals, public entertainment venues, and bathrooms in homes. Most hand dryer products on the market currently use series-wound motors or brushed DC motors, and their common feature is the use of carbon brushes and commutators. Since the carbon brushes wear during operation, it will cause dust pollution and the working life is not long. In view of the above problems, considering to extend the service life of the hand dryer, hand dryers using DC permanent magnet brushless motors are available on the market. Although the service life of hand dryer products with this structure is extended, permanent magnet materials with higher usage costs are required. The rotor made of permanent magnet materials not only has a high overall cost, but also has a complex production and processing technology. Summary of the Invention

[0003] The first object of the present invention is to provide a switched reluctance motor to solve the technical problems of simplifying the manufacturing process of the motor and reducing the manufacturing cost.

[0004] The second object of the present invention is to provide a blower to solve the technical problems of simplifying the manufacturing process of the motor in the blower and reducing the manufacturing cost.

[0005] The third object of the present invention is to provide a hand dryer to solve the technical problems of extending the operating stability and service life of the hand dryer.

[0006] A switched reluctance motor of the present invention is implemented as follows:

[0007] A switched reluctance motor includes: a housing, an end cover mating with the housing, a stator assembly disposed inside the housing, and a rotor assembly installed inside the stator assembly and located between the housing and the end cover; wherein

[0008] At the bottom of the housing, there is a first bearing chamber adapted to be assembled with a rear bearing on the rotor assembly; and at the center of the end cover, there is a second bearing chamber adapted to be assembled with a front bearing on the rotor assembly; and

[0009] At one end of the stator assembly close to the end cover, a detection element is further provided, and on the rotor shaft of the rotor assembly, there is a measured component adapted to be detected by the detection component.

[0010] In a preferred embodiment of the invention, the stator assembly includes: a stator core, a coil bobbin integrally injection-molded with the stator core, a coil adapted to be wound and installed on the coil bobbin, and a terminal adapted to be inserted into the coil bobbin; wherein

[0011] The detection component is assembled on the coil bobbin;

[0012] The stator core is composed of a plurality of silicon steel sheets stacked together, and the stator core as a whole has a substantially circular structure;

[0013] A plurality of protruding portions protruding radially outward are uniformly arranged in the circumferential direction of the stator core, and an interference fit is provided between the protruding portions and the housing; and

[0014] A through hole penetrating axially is provided in the protruding portion, and a plurality of stator salient poles are formed by the inward extension of the inner circle of the stator yoke of the stator core.

[0015] In a preferred embodiment of the invention, a plurality of air outlets are provided on the side wall of the housing; and

[0016] A clamping block and a protrusion are also formed on the inner side wall of the housing; wherein

[0017] The clamping hook is adapted to be clamped with one axial end of the stator core, and the protrusion is adapted to be clamped with the other axial end of the stator core.

[0018] In an alternative embodiment of the invention, the detection component includes two adjacent Hall sensors, and the component to be measured is a magnetic ring sleeved on the rotor shaft;

[0019] One of the two Hall sensors is disposed on the center line of any one stator salient pole, and the other Hall sensor is disposed on the center line of the stator core slot adjacent to the above-mentioned stator salient pole;

[0020] The rotor assembly further includes a rotor core sleeved on the rotor shaft; there is a through hole in the center of the rotor core, and a plurality of rotor salient poles with the same structure are provided on the outer circumference in the circumferential direction of the rotor core.

[0021] In an alternative embodiment of the invention, two symmetrically distributed rotor salient poles are provided on the outer circumference in the circumferential direction of the rotor core; and the air gap between one end of the outer circle side of any one rotor salient pole and the inner circumference of the stator core is b1, and the air gap between the other end of the outer circle side of the rotor salient pole and the inner circumference of the stator core is b2;

[0022] When the rotor assembly rotates counterclockwise, b1 > b2; when the rotor assembly rotates clockwise, b2 > b1; and

[0023] The outer circle of the magnetic ring is provided with two pairs of uniformly distributed N poles and S poles; and any pair of N poles and S poles corresponds to one rotor salient pole.

[0024] In an alternative embodiment of the invention, the included angle of the sector side formed between the dividing line of any pair of N poles and S poles and the end with a smaller air gap between the outer circle side of the rotor salient pole and the inner circumference of the stator core is 20° - 50°.

[0025] In an alternative embodiment of the invention, both of the Hall sensors are connected to a Hall PCB board through the same Hall bracket; the Hall PCB board is assembled on a bobbin;

[0026] The Hall bracket is adapted to be fixedly connected to the Hall PCB board; and

[0027] A plurality of through holes adapted to pass through the pins of the Hall sensor one by one are formed in the Hall bracket, and the pins of the Hall sensor are adapted to be bent and penetrate through the through holes and then connected to the Hall PCB board;

[0028] On the end face of the Hall bracket facing away from the Hall PCB board, a plurality of guide grooves corresponding to the plurality of through holes one by one are further provided;

[0029] The groove path of the guide groove is in a bent structure with respect to the axis of the through hole, so as to be adapted to guide the pre-bent pins of the Hall sensor to be inserted into the through holes or guide the pins of the Hall sensor to be bent in the guide groove and then inserted into the through holes.

[0030] In an alternative embodiment of the invention, the detection component includes two adjacent opto-electronic switches, and the component to be measured is a light-shielding plate sleeved on a rotor shaft;

[0031] Both of the opto-electronic switches are fixed on the same opto-electronic PCB board, and the opto-electronic PCB board is assembled on a bobbin;

[0032] One of the two opto-electronic switches is arranged on the center line of any stator pole tip, and the other opto-electronic switch is arranged on the center line of a stator core slot adjacent to the above stator pole tip;

[0033] The rotor assembly further includes a rotor core sleeved on the rotor shaft; there is a through hole in the center of the rotor core, and there are a plurality of rotor pole tips with the same structure on the circumferential outer side of the rotor core.

[0034] In an alternative embodiment of the invention, there are two symmetrically distributed rotor pole tips on the circumferential outer side of the rotor core; and the air gap between one end of the outer circle side of any rotor pole tip and the inner circumference of the stator core is b1, and the air gap between the other end of the outer circle side of the rotor pole tip and the inner circumference of the stator core is b2;

[0035] When the rotor assembly rotates counterclockwise, b1>b2; when the rotor assembly rotates clockwise, b2>b1; and

[0036] The light-shielding plate includes a circular base sleeved on the rotor shaft, and a pair of arc-shaped baffles symmetrically arranged in the circumferential direction of the base; the pair of arc-shaped baffles are distributed corresponding to the two rotor pole tips one by one.

[0037] In an alternative embodiment of the invention, the sector edge angle formed between one of the edges of any arc-shaped baffle along the radial direction of the rotor shaft and the end with a smaller air gap between the outer circular side of the rotor salient pole and the inner circumference of the stator core is 20° to 50°.

[0038] The blower of the present invention is implemented as follows:

[0039] A blower includes: the switched reluctance motor, a guide vane, a wind blade and a wind cover;

[0040] The wind cover is mounted on the flange of the housing of the reluctance motor, and the central hole at one end of the wind cover has an air inlet;

[0041] The wind blade is fixed to one end of the rotor shaft and is located between the wind cover and the guide vane; and

[0042] The guide vane has a central hole in the middle so that one end of the rotor shaft passes through the central hole and then fixes the wind blade.

[0043] The hand dryer of the present invention is implemented as follows:

[0044] A hand dryer includes: a housing and the blower provided in the housing; and

[0045] A controller adapted to control the operation of the blower is further provided in the housing.

[0046] In an alternative embodiment of the invention, the controller includes: a control board, a controller housing and a controller cover; wherein

[0047] The control board is fixed inside the controller housing and the controller cover;

[0048] The control board includes a control PCB board; a weak current area and a strong current area are provided on the control PCB board;

[0049] The weak current area extends from one side of the control PCB board towards the middle; the strong current area is distributed around the weak current area.

[0050] In an alternative embodiment of the invention, an MCU control unit, a temperature detection circuit, an infrared induction and heating power switching circuit, a debugging and downloading port circuit, a rotor position signal detection circuit, an LED display control circuit, a current amplification and chopping circuit, an auxiliary power supply circuit, a bus voltage detection circuit and an overcurrent protection circuit are provided in the weak current area;

[0051] A rectification circuit, a two-phase asymmetric half-bridge circuit and a heating wire control circuit are provided in the strong current area.

[0052] Compared with the prior art, the present invention has the following beneficial effects: For the switched reluctance motor, the fan and the hand dryer of the present utility model, compared with the hand dryer using a series-wound motor, the motor system composed of the switched reluctance motor has a long service life, reliable operation, does not generate dust that pollutes the environment, and has a simple manufacturing process. Compared with the hand dryer using a brushless DC permanent magnet motor, since the switched reluctance motor does not need to use permanent magnet materials, the motor system composed of the switched reluctance motor has a low cost and a simple manufacturing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The present invention will be further described below in conjunction with the drawings and embodiments.

[0054] Figure 1 FIG. shows an exploded structural schematic diagram of the fan provided in Embodiment 2 of the present invention;

[0055] Figure 2 FIG. shows a structural schematic diagram of the housing of the switched reluctance motor provided in Embodiment 1 of the present invention;

[0056] Figure 3 FIG. shows a mating structural schematic diagram of the housing and the stator assembly of the switched reluctance motor provided in Embodiment 1 of the present invention;

[0057] Figure 4 FIG. shows a partial structural schematic diagram of the stator assembly of the switched reluctance motor provided in Embodiment 1 of the present invention Figure 1 ;

[0058] Figure 5 FIG. shows a partial structural schematic diagram of the stator assembly of the switched reluctance motor provided in Embodiment 1 of the present invention Figure 2 ;

[0059] Figure 6 FIG. shows a partial structural schematic diagram of the stator assembly of the switched reluctance motor provided in Embodiment 1 of the present invention Figure 3 ;

[0060] Figure 7 FIG. shows a mating structural schematic diagram of the Hall sensor, the Hall bracket and the Hall PCB board of the switched reluctance motor provided in Embodiment 1 of the present invention;

[0061] Figure 8 FIG. shows a structural schematic diagram of the Hall PCB board of the switched reluctance motor provided in Embodiment 1 of the present invention;

[0062] Figure 9 FIG. shows a first perspective structural schematic diagram of the Hall bracket of the switched reluctance motor provided in Embodiment 1 of the present invention;

[0063] Figure 10 FIG. shows a second perspective structural schematic diagram of the Hall bracket of the switched reluctance motor provided in Embodiment 1 of the present invention;

[0064] Figure 11 Shows the schematic structural diagram of the Hall sensor of the switched reluctance motor provided in Embodiment 1 of the present invention;

[0065] Figure 12 Shows the schematic structural diagram of the stator core of the switched reluctance motor provided in Embodiment 1 of the present invention;

[0066] Figure 13 Shows the schematic structural diagram of the stator core and rotor poles of the switched reluctance motor provided in Embodiment 1 of the present invention;

[0067] Figure 14 Shows the schematic cooperation structure diagram of the rotor poles and the magnetic poles of the magnetic ring of the switched reluctance motor provided in Embodiment 1 of the present invention;

[0068] Figure 15 Shows the schematic cooperation structure diagram of the Hall sensor and the magnetic poles of the magnetic ring of the switched reluctance motor provided in Embodiment 1 of the present invention under different conditions;

[0069] Figure 16 Shows the schematic cooperation structure diagram of the optoelectronic switch and the optoelectronic PCB board of the switched reluctance motor provided in Embodiment 1 of the present invention;

[0070] Figure 17 Shows the schematic split structure diagram of the optoelectronic switch and the optoelectronic PCB board of the switched reluctance motor provided in Embodiment 1 of the present invention;

[0071] Figure 18 Shows the schematic structural diagram of the optoelectronic switch of the switched reluctance motor provided in Embodiment 1 of the present invention;

[0072] Figure 19 Shows the schematic structural diagram of the light shielding plate of the switched reluctance motor provided in Embodiment 1 of the present invention;

[0073] Figure 20 Shows the schematic cooperation structure diagram of the rotor poles and the light shielding plate of the switched reluctance motor provided in Embodiment 1 of the present invention;

[0074] Figure 21 Shows the schematic cooperation structure diagram of the optoelectronic switch and the arc-shaped baffle of the light shielding plate of the switched reluctance motor provided in Embodiment 1 of the present invention under different conditions;

[0075] Figure 22 Is the schematic diagram of the distribution of the strong and weak electricity areas of the control board of the hand dryer provided in Embodiment 3 of the present invention;

[0076] Figure 23 Is the schematic diagram of the distribution of each circuit of the control board of the hand dryer provided in Embodiment 3 of the present invention;

[0077] Figure 24 The principle block diagram of the control board of the hand dryer provided in Embodiment 3 of the present invention;

[0078] Figure 25 The circuit diagram of the MCU control unit of the hand dryer provided in Embodiment 3 of the present invention;

[0079] Figure 26 The circuit diagram of the infrared induction and heating function switching circuit of the hand dryer provided in Embodiment 3 of the present invention;

[0080] Figure 27 The circuit diagram of the LED display control circuit of the hand dryer provided in Embodiment 3 of the present invention;

[0081] Figure 28 The circuit diagram of the two-phase asymmetric half-bridge circuit of the hand dryer provided in Embodiment 3 of the present invention;

[0082] Figure 29 The circuit diagram of the rotor position signal detection circuit of the hand dryer provided in Embodiment 3 of the present invention;

[0083] Figure 30 The installation schematic diagram of the power switch tube and the heat dissipation plate of the two-phase asymmetric half-bridge circuit of the hand dryer provided in Embodiment 3 of the present invention;

[0084] Figure 31 The exploded view of the controller of the hand dryer provided in Embodiment 3 of the present invention;

[0085] Figure 32 The front view of the controller housing of the hand dryer provided in Embodiment 3 of the present invention;

[0086] Figure 33 is Figure 32 the rear view of;

[0087] Figure 34 is Figure 32 the top view of;

[0088] Figure 35 is Figure 32 the side view of;

[0089] Figure 36 The front view of the controller cover of the hand dryer provided in Embodiment 3 of the present invention;

[0090] Figure 37 is Figure 36 the side view of;

[0091] Figure 38 The internal structure schematic diagram of the blower provided in Embodiment 2 of the present invention is shown. Detailed implementation manners

[0092] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so they only show the components related to the present invention.

[0093] Embodiment 1:

[0094] Referring to Figure 1 As shown, this embodiment provides a switched reluctance motor, including: a housing 501, an end cover 502 mating with the housing 501, a stator assembly disposed inside the housing 501, and a rotor assembly installed inside the stator assembly and located between the housing 501 and the end cover 502; wherein there is a first bearing chamber at the bottom of the housing 501 adapted to be assembled with a rear bearing 503 on the rotor assembly; and a second bearing chamber is provided at the center of the end cover 502 adapted to be assembled with a front bearing 505 on the rotor assembly; and a detection element is further provided at one end of the stator assembly close to the end cover 502, and a measured component adapted to be detected by the detection component is further provided on the rotor shaft 506 of the rotor assembly, that is, the detection of the rotor position is realized by detecting the measured component on the rotor shaft 506 by the detection element.

[0095] Next, the stator assembly will be described first:

[0096] The stator assembly includes: a stator core 510, a bobbin 511 integrally injection-molded with the stator core 510, a coil 512 adapted to be wound and installed on the bobbin 511, and a terminal 513 adapted to be inserted into the bobbin 511; wherein the detection component is assembled on the bobbin 511.

[0097] The stator core 510 is composed of a plurality of silicon steel sheets laminated together, and the stator core 510 is generally circular in overall structure; a plurality of protrusions 515 protruding radially outward are uniformly arranged in the circumferential direction of the stator core 510, and the protrusions 515 are in interference fit with the housing 501 to limit the circumferential rotation of the stator core 510; and a through hole 516 axially penetrating is provided in the protrusion 515. The setting of the through hole 516 enables the injection molding material to flow into the through hole 516 when the stator core 510 and the bobbin 511 are injection-molded, so as to ensure the bonding strength between the bobbin 511 and the stator core 510. A plurality of stator poles 517 extend inward from the inner circle of the stator yoke of the stator core 510.

[0098] More specifically, the bobbin 511 and the stator core 510 are integrally injection-molded, and the injection layer surrounds a part of the stator salient pole 517. Integrally injection-molding the stator core 510 and the bobbin 511 can make the combination of the bobbin 511 and the stator core 510 more firm, solve the problem of difficult assembly, and has the advantages that the bobbin 511 is not prone to deformation and warping in an environment with large temperature changes and has low noise. Four grooves 518 are integrally provided on the radial outer edge at one axial end of the bobbin 511 for inserting the terminals 513. The terminals 513 are inserted into the grooves 518 and contact the head or tail of the coil 512 in the grooves 518 to form an electrical connection; and two threaded holes 533 and positioning studs 535 are provided at the other axial end of the bobbin 511 for installing and fixing the detection components. Under such a design structure, the threaded holes 533 used to fix the monitoring components can be far away from the winding part of the bobbin 511. The threaded holes 533 and the positioning studs 535 are located near the through holes 516 on the outer edge of the stator core 510, so that the positions of the threaded holes 533 and the positioning studs 535 will not be deformed after winding.

[0099] Next, let's talk about the housing 501:

[0100] A plurality of air outlets 520 are provided on the side wall of the housing 501; in combination with the drawings of this embodiment, in an optional implementation case, the number of the air outlets 520 is set to 4, and the 4 air outlets 520 are specifically provided on the part of the side wall of the housing 501 close to the bottom wall. The setting of the air outlets 520 can achieve the effect of quickly dissipating heat during the use of the motor. In addition, in this embodiment, a clamping block 521 and a protrusion 522 are also formed on the inner side wall of the housing 501; the clamping block 521 is adapted to be clamped with one axial end of the stator core 510, and the protrusion 522 is adapted to be clamped with the other axial end of the stator core 510. It should be noted that there is more than one clamping block 521 and protrusion 522 here. In an optional case, the clamping blocks 521 can be arranged at intervals and evenly along the circumferential direction of the inner side wall of the housing 501, for example but not limited to four. Similarly, the protrusions 522 can also be arranged at intervals and evenly along the circumferential direction of the inner side wall of the housing 501, for example but not limited to four. For the clamping blocks 521 and protrusions 522 of this embodiment, they are formed during the riveting process of the housing 501 and the stator assembly. After the stator assembly is installed in the housing 501, it is riveted on the outer side wall of the housing 501 by a riveting tooling, so that the clamping blocks 521 and protrusions 522 are formed on the inner side wall of the housing 501, fixing the stator assembly to the housing 501. The axial movement of the stator assembly is restricted by the clamping blocks 521 and protrusions 522 limiting the two axial ends of the stator core 510 of the stator assembly, so that the stator assembly will not move relatively in the housing 501 during use, ensuring the firmness after assembly between the stator assembly and the housing 501.

[0101] Next, the detection components of this embodiment will be described. For the detection components of this embodiment, for example, but not limited to, a Hall sensor 302 can be used, and an optoelectronic switch 551 can also be used. In this regard, this embodiment will be described by taking these two cases as examples.

[0102] In the first case, the detection component includes two adjacent Hall sensors 302, and the component to be measured is a magnetic ring 531 sleeved on the rotor shaft 506; the two Hall sensors 302 here are specifically assembled onto the bobbin through the following structure.

[0103] Both of the two Hall sensors 302 are connected to the Hall PCB board 301 through the same Hall bracket 304; and the Hall PCB board 301 is assembled on the bobbin 511. That is, the Hall bracket 304 plays a role of transitional connection between the Hall sensor 302 and the Hall PCB board 301. For the two Hall sensors 302 of this embodiment, the cooperation structures between them and the Hall bracket 304 are the same. Therefore, the following description of this embodiment only illustrates the specific situation of one Hall sensor 302.

[0104] Specifically, the Hall bracket 304 is adapted to be fixedly connected to the Hall PCB board 301. A plurality of through holes 303 are formed in the Hall bracket 304 for the plurality of pins 3022 of the Hall sensor 302 to pass through one by one. The pins 3022 of the Hall sensor 302 are adapted to bend through the through holes 303 and then be connected to the Hall PCB board 301; on the end face of the Hall bracket 304 facing away from the Hall PCB board 301, a plurality of guiding grooves 305 corresponding to the plurality of through holes 303 one by one are further provided.

[0105] In addition, on the Hall PCB board 301, there are a plurality of pad holes 306 that correspond to and cooperate with the plurality of through holes 303 on the Hall bracket 304 one by one; the plurality of through holes 303 are not collinear; and the plurality of pad holes 306 are also not collinear. Such a structure is for mating with the bent pins 3022 of the Hall sensor 302 in this embodiment. That is, when the plurality of pins 3022 of the Hall sensor 302 are bent, the plurality of pins 3022 on each Hall sensor 302 will not be on the same straight line with each other. Therefore, in this embodiment, by mating the plurality of pins 3022 of the Hall sensor 302 in the bent state with the Hall PCB board 301, the defective rate of the mating process between the Hall sensor 302 and the Hall PCB board 301 can be reduced. Specifically, since the three pins 3022 of the Hall sensor 302 are linearly distributed before being bent, and the distance between each adjacent pair of pins 3022 is too close. If the pins 3022 are directly soldered to the Hall PCB board 301 without being bent, at this time, the plurality of pad holes 306 provided on the Hall PCB board 301 need to correspond to the plurality of pins 3022 on the Hall sensor 302 that are on the same straight line and also be linearly distributed. In this case, the distance between the plurality of pad holes 306 will also be small, and the defective rate of tin bridging short circuit between the pad holes 306 will increase, and the corresponding defective rate after processing will also increase equally.

[0106] Taking a specific and optional implementation case in combination with the drawings of this embodiment, the number of pins 3022 of each Hall sensor 302 is three; and the number of through holes 303 corresponding to each Hall sensor 302 on the Hall bracket 304 is three, and the three through holes 303 are distributed in a triangular structure; the number of pad holes 306 of each Hall sensor 302 on the Hall PCB board 301 is also three, and the three pad holes 306 are distributed in a triangular structure. Here, for the three through holes 303 and the three pad holes 306, whether they form a triangular structure or other shaped structures is determined according to the shape formed after the three pins 3022 of the Hall sensor 302 are bent. Therefore, the specific shapes of the three through holes 303 and the three pad holes 306 in the actual use case are not absolutely limited in this embodiment, and they are mainly adaptively matched according to the shape formed after the three pins 3022 of the Hall sensor 302 are bent.

[0107] Next, let's talk about the pin 3022 of the Hall sensor 302 in this embodiment. The guiding groove 305 in this embodiment can guide the pin 3022 of the Hall sensor 302 inserted into the through hole 303. The groove path of the guiding groove 305 in this embodiment is in a bent structure with respect to the axis of the through hole 303. In one case, the guiding groove 305 in this structure can guide the pre-bent pin 3022 of the Hall sensor 302 to be inserted into the through hole 303; and in another case, the guiding groove 305 in this structure can also guide the pin 3022 of the Hall sensor 302 to be bent in the guiding groove 305 and then inserted into the through hole 303. That is to say, for the first case mentioned above, the pin 3022 of the Hall sensor 302 has been pre-bent and formed before entering the guiding groove 305. After the bent pin 3022 passes through the groove path of the guiding groove 305, it is inserted into the through hole 303 until the pin 3022 of the Hall sensor 302 is finally inserted into the pad hole 306 on the Hall PCB board 301 and then welded and fixed to the Hall PCB board 301. For the second case mentioned above, the pin 3022 of the Hall sensor 302 does not undergo the pre-bending and forming operation process before entering the guiding groove 305. Instead, during the process of inserting the pin 3022 of the Hall sensor 302 into the guiding groove 305 and the through hole 303, the groove path of the guiding groove 305 is used to guide the pin 3022 of the Hall sensor 302 to be bent and inserted into the through hole 303 and the pad hole 306 on the Hall PCB board 301 in sequence. That is, during this process, the groove path of the guiding groove 305 plays a guiding effect on the bending of the pin 3022 of the Hall sensor 302.

[0108] In summary, both of the above two cases can achieve the final welding and fixing of the pin 3022 of the Hall sensor 302 to the pad hole 306 on the Hall PCB board 301 in a bent state. However, in the first case where the pin 3022 of the Hall sensor 302 is pre-bent and formed, it can ensure that a certain length of the root part where the pin 3022 of the Hall sensor 302 is connected to the body 3021 of the Hall sensor 302 is a straight line segment. In this way, it is not easy to cause damage to the root part of the pin 3022 during the bending and forming process, thus effectively ensuring the performance of the Hall sensor 302. In the second case where the pin 3022 of the Hall sensor 302 is not pre-bent and formed, it cannot ensure that a certain length of the root part where the pin 3022 of the Hall sensor 302 is connected to the body 3021 of the Hall sensor 302 is a straight line segment, and it is easy to be bent at the root part of the pin 3022, resulting in damage to the root part and ultimately affecting the performance of the Hall sensor 302.

[0109] It should also be noted that in this embodiment, a sensor mounting portion is further provided on the end face of the Hall bracket 304 facing away from the Hall PCB board 301; the sensor mounting portion includes a surrounding wall 3071 adapted to circumferentially wrap around the body 3021 of the Hall sensor 302, and at least one opening 3072 formed in the surrounding wall 3071, which may be a pair of symmetrically arranged openings 3072. The opening 3072 here can, on the one hand, make way for the guiding groove 305, and on the other hand, facilitate the demolding of the sensor mounting portion during processing. The surrounding wall 3071 here can play a role in circumferentially supporting the body 3021 of the Hall sensor 302, so that the body 3021 of the Hall sensor 302 can be limited in the sensor mounting portion after being welded and fixed to the Hall PCB board 301, thereby avoiding the problem of shaking of the body 3021 of the Hall sensor 302.

[0110] For the Hall bracket 304 of this embodiment, the firmness of the mating between the Hall bracket 304 and the Hall PCB board 301 will directly affect the stability of the mating between the Hall sensor 302 and the Hall PCB board 301. Considering effectively ensuring the firmness of the mating between the Hall bracket 304 and the Hall PCB board 301, taking an optional case as an example with reference to the accompanying drawings, this embodiment adopts the following structure:

[0111] Firstly, at least one protruding positioning post 308 is provided on the end face of the Hall bracket 304 facing the Hall PCB board 301; and at least one mating hole 309 adapted to mate with at least one positioning post 308 is formed in the Hall PCB board 301. The mating of the positioning post 308 and the mating hole 309 mainly plays a role in guiding and limiting during the assembly process of the Hall bracket 304 and the Hall PCB board 301.

[0112] Secondly, on the side end face of the Hall bracket 304 facing the Hall PCB board 301, at least two spaced-apart hooks 310 are protruded, which are adapted to be snap-fitted with the Hall PCB board 301. Taking an optional case in combination with the drawings of this embodiment, on the side end face of the Hall bracket 304 facing the Hall PCB board 301, two spaced-apart hooks 310 are protruded; and, considering the convenience and efficiency of processing, one of the two hooks 310 in this embodiment is adapted to be snap-fixed to the side end face of the Hall PCB board 301, so that the side end face of the Hall PCB board 301 can be directly used to mate with the hook 310, which can reduce the process of opening a hook hole 321 on the Hall PCB board 301. The other hook 310 of the two hooks 310 is adapted to be snap-fixed to the prefabricated hook hole 321 on the Hall PCB board 301, and the hook hole 321 here is opened on the Hall PCB board 301. In summary, that is to say, for the two hooks 310 of this embodiment, only one hook hole 321 needs to be opened on the Hall PCB board 301.

[0113] In addition, it should be noted that at least two spaced positioning holes 322 and at least two spaced screw mounting holes 323 are also opened on the Hall PCB board 301. Here, the screw mounting holes 323 cooperate with the threaded holes 533 on the coil holder 511, and the positioning holes 322 cooperate with the positioning protrusions 535 on the coil holder 511, so as to fix and assemble the Hall PCB board 301 to the coil holder 511, and effectively ensure the firmness of the assembly between the Hall PCB board 301 and the coil holder 511 through the cooperation of the above structures.

[0114] Regarding the two Hall sensors 302 of this embodiment, it should also be noted that one of the two Hall sensors 302 is disposed on the center line of any stator pole 517, and the other Hall sensor 302 is disposed on the center line of the stator core slot adjacent to the above stator pole 517; the rotor assembly further includes a rotor core 534 sleeved on the rotor shaft 506; there is a through hole in the center of the rotor core 534, the rotor core 534 is mounted on the rotor shaft 506 with convex ribs 536 on the outer circle, and there are a plurality of rotor poles 532 with the same structure on the circumferential outer side of the rotor core 534. Pressing the rotor shaft 506 with convex ribs 536 on the outer circle into the rotor core 534 is to ensure the firm assembly of the rotor shaft 506 and the rotor core 534. Compared with the rotor shaft 506 with a knurled outer circle structure, the rotor assembly of this invention has less deformation and stable dimensions.

[0115] For example, in the case of a switched reluctance motor with a 4 / 2 structure, there are two symmetrically distributed rotor poles 532 on the circumferential outer side of the rotor core 534. Since the two rotor poles 532 are designed with central symmetry, the unbalance of the overall rotor assembly is small in this case, and it can work reliably at a relatively high speed without adding a process for rotor dynamic balance correction on the production line. Moreover, the air gap formed between each rotor pole 532 and the inner circumference of the stator core 510 is uneven and gradually changes. Here, the air gaps formed between the two ends of the outer circle side of the two rotor poles 532 of the designed rotor core 534 and the inner circumference of the stator core 510 are not equal, in order to ensure that the motor rotor can self-start at any angular position without an auxiliary starting device.

[0116] Specifically, in this embodiment, the air gap between one end of the outer circle side of any rotor pole 532 and the inner circumference of the stator core 510 is defined as b1, and the air gap between the other end of the outer circle side of the rotor pole 532 and the inner circumference of the stator core 510 is defined as b2; when the rotor assembly rotates counterclockwise, b1 > b2; when the rotor assembly rotates clockwise, b2 > b1; and there are two pairs of evenly distributed N poles and S poles on the outer circle of the magnetic ring 531; and any pair of N poles and S poles corresponds to one rotor pole 532.

[0117] Here, the magnetic ring 531 is integrally injection-molded with the copper ring, that is, the magnetic ring 531 is fixedly connected to the rotating shaft through the copper ring. The magnetic ring 531 is axially installed between the front bearing 505 and the rotor core 534. In order to ensure that the relative angle between the rotor poles 532 of the rotor core 534 and the magnetic poles of the magnetic ring 531 is fixed, alignment holes corresponding to the rotor poles 532 are provided on the magnetic ring 531. In this way, when the magnetic ring 531 and the rotor shaft 506 are assembled, alignment holes can also be provided on the rotor poles 532, and the two positioning jigs pass through these alignment holes to achieve the positioning of the two. Or alignment holes may not be provided on the rotor poles 532, but with the help of the sector structure of the rotor poles 532, the auxiliary positioning jig ensures the fixed relative position between the two. In such a case, for the Hall sensor, only by detecting the angular position of the magnetic ring 531 can the angular position of the rotor poles 532 be determined. After the MCU control unit electrically connected to the Hall sensor obtains the position signal of the rotor poles 532 through the sensor signal input terminal, it controls the relative coils 512 in the stator assembly to turn on or off the excitation.

[0118] Regarding the magnetic ring 531 of this embodiment, for the two pairs of magnetic poles on the magnetic ring 531, the included angle K of the fan-shaped edge formed between the dividing line of any pair of N and S poles and the end with a smaller air gap between the outer circle side of the rotor salient pole 532 and the inner circumference of the stator core 510 is 20° to 50°, and the preferred angle is 34.9°. Here, through the accurate setting of the positions of the two Hall sensors 302 and the precise design of the relative positions of the magnetic poles of the magnetic ring 531 and the rotor protrusions 522, combining these two aspects of the structure can effectively improve the accuracy of detecting the position of the rotor shaft 506 and the induction accuracy of the Hall sensors 302. And under this structure, the motor can also commutate when the inductance is the largest or the smallest, and the motor efficiency is high.

[0119] Combined with the attached drawings, the situation of the two Hall sensors 302 will be described in detail. The Hall sensor 302 set on the center line of any stator salient pole 517 is defined as Hall A, and the Hall sensor 302 set on the center line of the stator core slot adjacent to the above stator salient pole 517 is defined as Hall B.

[0120] As Figure 15 (a), Hall A senses the S pole of the magnetic ring 531 and Hall B senses the N pole of the magnetic ring 531. At this time, the A-phase coil 512 on the coil holder 511 is powered off and the B-phase coil 512 is powered on. Due to the electromagnetic force, the rotor shaft 506 rotates in the direction of the minimum magnetic resistance, that is, counterclockwise to the position as shown in Figure 15 (b);

[0121] As Figure 15 (b), Hall A senses the S pole of the magnetic ring 531 and Hall B senses the S pole of the magnetic ring 531. At this time, the A-phase coil 512 on the coil holder 511 is powered off and the B-phase coil 512 is powered on. Due to the electromagnetic force, the rotor shaft 506 rotates in the direction of the minimum magnetic resistance, that is, counterclockwise to the position as shown in Figure 15 (c);

[0122] As Figure 15 (c), Hall A senses the N pole of the magnetic ring 531 and Hall B senses the S pole of the magnetic ring 531. At this time, the A-phase coil 512 is powered on and the B-phase coil 512 is powered off. Due to the electromagnetic force, the rotor shaft 506 rotates in the direction of the minimum magnetic resistance, that is, counterclockwise to the position as shown in Figure 15 (d);

[0123] As Figure 15 (d), Hall A senses the N pole of the magnetic ring 531 and Hall B senses the N pole of the magnetic ring 531. At this time, the A-phase coil 512 is powered on and the B-phase coil 512 is powered off. Due to the electromagnetic force, the rotor shaft 506 rotates in the direction of the minimum magnetic resistance, that is, counterclockwise to the position as shown in Figure 15The position of (a) is used to form a cycle to ensure that the rotor shaft 506 can rotate counterclockwise at any position.

[0124] In the second case, the detection component includes two adjacent optoelectronic switches 551, and the component to be measured is a light-shielding plate sleeved on the rotor shaft 506; the light-shielding plate in this embodiment is made by stamping a metal plate material. The two optoelectronic switches 551 are both fixed on the same optoelectronic PCB board 552, and the optoelectronic PCB board 552 is assembled on the bobbin 511. One of the two optoelectronic switches 551 is arranged on the center line of any stator pole 517, and the other optoelectronic switch 551 is arranged on the center line of the stator core slot adjacent to the above stator pole 517.

[0125] Specifically, a first positioning hole 553 is provided on the optoelectronic PCB board 552, which is assembled with the positioning and mounting post 557 at the bottom of the optoelectronic switch 551. Above the first positioning hole 553, a second positioning hole 555 is provided, which is assembled with the positioning convex post 535 of the bobbin 511 in the stator assembly; near the second positioning hole 555, a screw hole 556 is provided, and the screw hole 556 here is matched with the threaded hole 533 on the bobbin 511 to realize the assembly and fixation of the optoelectronic PCB board 552 and the bobbin 511.

[0126] The optoelectronic switch 551 in this embodiment has a groove-shaped structure. The recessed groove 554 in the optoelectronic switch 551 is used to detect the angular position of the light-shielding plate on the rotor shaft 506. Two positioning and mounting posts 557 with different sizes are provided at the bottom of the optoelectronic switch 551, corresponding to the first positioning hole 553 on the optoelectronic PCB board 552. The optoelectronic switch 551 also has four pins, which are welded to the corresponding pads on the optoelectronic PCB board 552. In an optional embodiment, the two positioning and mounting posts 557 here have different sizes. In this way, the two positioning and mounting posts 557 with different sizes correspond to the first positioning hole 553 on the optoelectronic PCB board 552. This design is to prevent the reverse installation of the optoelectronic switch 551 and make the optoelectronic switch 551 be reliably installed on the optoelectronic PCB board.

[0127] For the rotor assembly in this embodiment, the structure of the rotor assembly in the case of using the optoelectronic switch 551 and the case of using the Hall sensor 302 can be the same. Therefore, the specific structure of the rotor assembly will not be described in detail here.

[0128] Specifically, the light shield includes a circular base body 558 sleeved on the rotor shaft 506, and a pair of arc-shaped baffles 559 symmetrically distributed in the circumferential direction of the base body 558. The pair of arc-shaped baffles 559 are distributed in one-to-one correspondence with the two rotor salient poles 532. The base body 558 is connected to the outer circle of the rotor shaft 506 by an interference fit through a flanging hole provided at its center. The light shield is axially installed between the front bearing 505 and the rotor core 534. The relative angle between the pair of rotor salient poles 532 of the rotor core 534 and the pair of arc-shaped baffles 559 in this embodiment is fixed. When assembling the two, the auxiliary positioning tooling ensures the fixed relative position between them. In this case, for the photoelectric switch 551, only by detecting the angular position of the light shield can the angular position of the rotor salient pole 532 be determined. After the MCU control unit electrically connected to the photoelectric switch 551 obtains the position signal of the rotor salient pole 532 through the inductor signal input terminal, it controls the relative coils 512 in the stator assembly to turn on or off the excitation.

[0129] It should also be noted that the included angle K of the fan-shaped edge formed between one edge of any arc-shaped baffle 559 along the radial direction of the rotor shaft 506 and the end with a smaller air gap between the outer circle side of the rotor salient pole 532 and the inner circumference of the stator core 510 is 20° to 50°. The optimal angle is 34.9°. Here, through the accurate setting of the positions of the two photoelectric switches 551 and the precise design of the relative positions of the arc-shaped baffles 559 of the light shield and the rotor protrusions 522, combining these two aspects of the structure can effectively improve the accuracy of detecting the position of the rotor shaft 506 and the induction accuracy of the photoelectric switch 551. And under this structure, the motor can also commutate when the inductance is the largest or the smallest, and the motor efficiency is high.

[0130] Combined with the drawings, the situation of the two photoelectric switches 551 will be described in detail. The photoelectric switch 551 set on the center line of any stator salient pole 517 is defined as photoelectric switch A, and the photoelectric switch 551 set on the center line of the stator core slot adjacent to the above stator salient pole 517 is defined as photoelectric switch B.

[0131] As Figure 21 (a), when the photoelectric switch A does not sense the arc-shaped baffle 559 of the light shield and the photoelectric switch B senses the arc-shaped baffle 559 of the light shield, at this time, the A-phase coil 512 on the coil holder 511 is powered off and the B-phase coil 512 is powered on. Due to the electromagnetic force, the rotor shaft 506 rotates in the direction of the minimum magnetic resistance, that is, counterclockwise to the position as shown in Figure 21 (b);

[0132] As Figure 21(b), the photoelectric switch A does not sense the arc-shaped baffle 559 of the light-shielding plate, and the photoelectric switch B does not sense the arc-shaped baffle 559 of the light-shielding plate. At this time, the A-phase coil 512 on the coil holder 511 is powered off, and the B-phase coil 512 is powered on. Due to the electromagnetic force, the rotor shaft 506 rotates in the direction of the minimum magnetic resistance, that is, counterclockwise to the position shown in Figure 21 (c);

[0133] As shown in Figure 21 (c), the photoelectric switch A senses the arc-shaped baffle 559 of the light-shielding plate, and the photoelectric switch B does not sense the arc-shaped baffle 559 of the light-shielding plate. At this time, the A-phase coil 512 is powered on, and the B-phase coil 512 is powered off. Due to the electromagnetic force, the rotor shaft 506 rotates in the direction of the minimum magnetic resistance, that is, counterclockwise to the position shown in Figure 21 (d);

[0134] As shown in Figure 21 (d), the photoelectric switch A senses the arc-shaped baffle 559 of the light-shielding plate, and the photoelectric switch B senses the arc-shaped baffle 559 of the light-shielding plate. At this time, the A-phase coil 512 is powered on, and the B-phase coil 512 is powered off. Due to the electromagnetic force, the rotor shaft 506 rotates in the direction of the minimum magnetic resistance, that is, counterclockwise to the position shown in Figure 21 (a), thus forming a cycle to ensure that the rotor shaft 506 can rotate counterclockwise at any position.

[0135] Compared with the structure using the Hall sensor 302, the structure of the photoelectric switch 551 in this embodiment has the following advantages. On the one hand, the photoelectric switch 551 does not require the Hall bracket 304 for fixing the Hall sensor 302 in a fixed position, which is convenient for assembly and has a low overall cost. On the other hand, the rotor assembly using the Hall sensor 302 and the magnetic ring 531 needs to use a magnetic ring 531 made of permanent magnetic material and requires magnetization of the magnetic ring 531. In this design, the light-shielding plate adopts a stamping process for metal plates, which has the advantages of low material cost and simple process.

[0136] Finally, let's talk about the end cover 502:

[0137] The end cover 502 is installed and fixed on the flange of the housing 501. There are mounting holes on both sides of the end cover 502, with two mounting holes on each side, corresponding to the mating holes on the flange of the housing 501. The bearing chamber for the rotor shaft 506 is provided at the center of the end cover 502 installed by screws.

[0138] Embodiment 2:

[0139] Based on the switched reluctance motor of Example 1, this embodiment provides a fan, comprising: the switched reluctance motor of Example 1, a wind deflector 561, a fan blade 562 and a wind shield 563; wherein the wind shield 563 is mounted on the flange of the housing 501 of the reluctance motor, and the central hole at one end of the wind shield 563 has an air inlet 568; the fan blade 562 is fixed to one end of the rotor shaft 506 and is located between the wind shield 563 and the wind deflector 561; and the wind deflector 561 has a central hole in the middle so that the fan blade 562 can be fixed after one end of the rotor shaft 506 passes through the central hole. Two threaded matching holes are also arranged on both sides of the central hole of the end cover 502, and screws pass through the mounting holes of the wind deflector 561 to fix the wind deflector 561 on the end cover 502.

[0140] After the rotor shaft 506 of the switched reluctance motor of the fan of this embodiment rotates, the fan blades 562 rotate together with the rotor shaft 506, and the air near the air inlet flows into the air inlet 568 under the action of the centrifugal blades of the fan blades 562. The air flowing into the air inlet 568 passes through the gap between the guide vanes on the guide plate 561 and flows into the gap formed by the stator slot 565 and the outer edge of the stator and the inner wall of the shell 501, and flows out at high speed from the air outlet 520 on the side of the shell 501.

[0141] Embodiment 3:

[0142] Based on the fan of Example 2, this embodiment provides a hand dryer, comprising: a housing and a fan disposed in the housing; and a controller suitable for controlling the operation of the fan is also disposed in the housing. The controller here comprises a control board 2, a controller housing 3 and a controller housing cover 4, and the control board 2 is fixed in the controller housing 3 and the controller housing cover 4.

[0143] The controller housing 3 is provided with a mounting base plate 31 for accommodating the control board 2. Two positioning matching columns 311 and two screw matching holes 312 are fixed at the four corners of the bottom inner surface of the mounting base plate 31. The two positioning matching columns 311 are distributed at a group of diagonal positions of the mounting base plate 31 and correspond to the mounting holes on the control PCB board 1. The two screw matching holes 312 are distributed at another group of diagonal positions of the mounting base plate 31 and correspond to the mounting holes on the control PCB board 1, which are used to fix the control PCB board 1 of the control board 2.

[0144] At one end edge of the controller housing 3, two mounting bosses 32 are provided. On the bottom outer surface of the mounting base plate 31 of the controller housing 3, two housing fixing parts 313 are further provided, and a mating connection hole for fixedly mounting the controller to the outside is provided at the center of each housing fixing part 313. On one side of the controller housing 3, a plurality of wire outlet holes 33 are provided for the connection wires between the control board 2 and the outside to pass through. For example: the mains power supply is connected to the power input end on the control board 2 through a wire passing through the wire outlet hole 33; the working state output end on the control board 2 is connected to the display device on the hand dryer through a wire passing through the wire outlet hole 33; the sensor input end on the control board 2 is connected to the sensor on the hand dryer through a wire passing through the wire outlet hole 33; the heater output end on the control board 2 is connected to the heating wire on the hand dryer through a wire passing through the wire outlet hole 33; the motor rotor position signal input end on the control board 2 is connected to the motor rotor position signal input end on the hand dryer motor through a wire passing through the wire outlet hole 33; the temperature sensor input end on the control board 2 is connected to the temperature sensor on the hand dryer through a wire passing through the wire outlet hole 33; the switched reluctance motor output end on the control board 2 is connected to the coil 512 on the hand dryer motor through a wire passing through the wire outlet hole 33.

[0145] At one end edge of the controller cover 4, two mounting holes 41 for assembling with the mounting bosses 32 on the controller housing 3 are provided to ensure firm installation between the controller cover 4 and the controller housing 3. The mounting holes 41 are rectangular through holes. At the edge of the controller cover 4, a cover fixing part 42 is further provided, and a mating mounting hole for fixedly mounting the controller to the outside is provided at the center of the cover fixing part 42.

[0146] On the control PCB board 1, a weak electricity area 11 and a strong electricity area 12 are provided. The weak electricity area 11 extends from one side of the control PCB board 1 towards the middle, and the strong electricity area 12 is distributed around the weak electricity area 11; in order to prevent high-voltage components and low-voltage components from interfering with each other and ensure the insulation gap and creepage distance between high-voltage components and low-voltage components, the control PCB board of the control board is divided into a strong electricity area and a weak electricity area, with high-voltage components placed in the strong electricity area and low-voltage components placed in the weak electricity area.

[0147] As Figure 23 shown, in the weak electricity area 11, an MCU control unit 111, an NTC temperature detection circuit 112, an infrared induction and heating power switching circuit 113, a debugging and downloading port circuit 114, a rotor position signal detection circuit 115, an LED display control circuit 116, a current amplification and chopping circuit 117, an auxiliary power supply circuit 118, a bus voltage detection circuit 119, and an overcurrent protection circuit 110 are provided; in the strong electricity area 12, a rectification circuit 121, a two-phase asymmetric half-bridge circuit 122, and a heating wire control circuit 123 are provided.

[0148] As Figure 30 shown, the power switching transistor T and the heat sink TS of the two-phase asymmetric half-bridge circuit 122 are arranged below the control PCB board 1, and the electronic components of other circuits are arranged above the control PCB board 1. Since the power switching transistor T and the heat sink TS are relatively large in size, this layout can save space.

[0149] As Figure 25 shown, the MCU control unit is used to control the hand dryer according to various sensed information and input information received; the MCU chip is powered by DC 3.3V, and the first I / O port to the nineteenth I / O port, the program debugging and programming port SWCLK and SWDIO are arranged on the MCU chip, and the I / O ports are connected to the above-mentioned various circuits.

[0150] As Figure 24 shown, the heating wire is installed on the air duct of the hand dryer and heats the air inhaled by the hand dryer under the drive of the heating wire control circuit. The heating wire control circuit controls the power supply of the heating wire to be turned on or off according to the heating instruction sent by the MCU control unit. If there is a fault that the heating wire cannot work, the heating wire control circuit transmits the fault signal to the MCU control unit.

[0151] As Figure 28 shown, the two-phase switched reluctance motor rotates under the drive of the two-phase asymmetric half-bridge circuit. The two-phase asymmetric half-bridge circuit is used to turn on or off the coils 512 of the two-phase switched reluctance under the control of the MCU control unit. As Figure 28 shown, the two-phase asymmetric half-bridge circuit consists of a half-bridge circuit module and a power transistor circuit module. The half-bridge drive circuit module includes a phase-A half-bridge drive module and a phase-B half-bridge drive module. The power transistor circuit module includes a phase-A power transistor drive module and a phase-B power transistor drive module. The circuit a1 of the phase-A half-bridge drive module is the same as the circuit b1 of the phase-B half-bridge drive module, and the circuit a2 of the phase-A power transistor drive module is the same as the circuit b2 of the phase-B power transistor drive module.

[0152] As Figure 28As shown in the figure, the A-phase half-bridge drive module includes eight resistors, four capacitors, two diodes, and one drive chip. The pin 1 of the drive chip U4 is connected to the 15V voltage output terminal VCC15V of the auxiliary power supply. One end of the resistor R90 serves as the signal input terminal of A+, and the other end of the resistor R90 is connected to the pin 2 of the drive chip U4 and one end of the capacitor C42. The other end of the capacitor C42 is connected to GND. One end of the resistor R91 serves as the signal input terminal of A-, and the other end of the resistor R91 is connected to the pin 3 of the drive chip U4 and one end of the capacitor C43. The other end of the capacitor C43 is connected to GND. One end of the capacitor C28 is connected to VCC15V, and the other end of the capacitor C28 is connected to GND. The positive electrode of the bootstrap diode D11 is connected to VCC15V in series with the resistor R55, and the negative electrode of the bootstrap diode D11 is connected to the pin 8 of the drive chip U4 and one end of the bootstrap capacitor C31. The other end of the bootstrap capacitor C31 is connected to the pin 6 of the drive chip. The positive electrode of the diode D12 is connected to the gate of the power transistor T1 of the A-phase power transistor drive module in series with the resistor R56. One end of the resistor R57 is connected to the negative electrode of the diode D12, and the other end of the resistor R57 is connected to the gate of the power transistor T1 of the A-phase power transistor drive module and one end of the resistor R58. The other end of the resistor R58 is connected to the pin 6 of the drive chip U4. One end of the resistor R59 is connected to the pin 5 of the drive chip U4, and the other end of the resistor R59 is connected to one end of the resistor R60 and the gate of the power transistor T2 of the A-phase power transistor drive module. The other end of the resistor R60 is connected to one end of the current detection resistor. Among them, the signal input terminal of A+ is connected to the thirteenth I / O port of the MCU control unit, and the signal input terminal of A- is connected to the tenth I / O port of the MCU control unit.

[0153] As Figure 28 shown in the figure, the A-phase power transistor drive module includes two power transistors, two diodes, and two capacitors. The gate of the power transistor T1 is connected to one end of the resistor R58 and the other end of R57. The emitter of the power transistor T1 is connected to the other end of the resistor R58, the pin 6 of the drive chip, the negative electrode of the fast recovery diode FWD2, one end of the capacitor C48, and one end of the motor A-phase coil 512. The collector of the power transistor is connected to the bus voltage input terminal Vmx of the rectifier circuit, the negative electrode of the fast recovery diode FWD1, and one end of the capacitor C34. The positive electrode of the fast recovery diode FWD2 is connected to GND, and the other end of the capacitor C48 is connected to GND. The gate of the power transistor T2 is connected to the other end of the resistor R59 and one end of the resistor R60. The emitter of the power transistor T2 is connected to the other end of the resistor R60 and one end of the current detection resistor R73. The current detection resistor R73 is the current detection resistor voltage drop output port Vyj. Among them, the capacitor C34 and the capacitor C48 are installed near the power transistor T1.

[0154] As Figure 28As shown, capacitors C42, C43, C44, and C45 are used in the A-phase half-bridge drive module and the B-phase half-bridge drive module. Capacitor C42 can suppress the interference signals generated during the transmission from the 13th I / O port of the MCU control unit to the A+ signal input terminal. Capacitor C43 can suppress the interference signals generated during the transmission from the 10th I / O port of the MCU control unit to the A− signal input terminal. Capacitor C44 can suppress the interference signals generated during the transmission from the 14th I / O port of the MCU control unit to the B+ signal input terminal. Capacitor C45 can suppress the interference signals generated during the transmission from the 11th I / O port of the MCU control unit to the A+ signal input terminal, preventing the power transistor from being mis-triggered.

[0155] As Figure 28 shown, the A-phase half-bridge drive module uses diodes D12, resistors R56, D14, and R62, which can turn off the power transistor T1 quickly, reducing the power consumption and temperature rise of the power transistor T1; the B-phase half-bridge drive module uses diodes D14 and resistor R62, which can turn off the power transistor T2 quickly, reducing the power consumption and temperature rise of the power transistor T2.

[0156] As Figure 28 shown, compared with the existing power topology circuit, capacitors C34 and C48 installed near the power transistor T1 are used in the A-phase power transistor drive module, and capacitors C35 and C49 installed near the power transistor T2 are used in the B-phase power transistor drive module, which can effectively suppress the radiated interference generated by the system (GB4343.1-2018, 4.1.2.2). By means of experiments, the capacitance values of capacitors C34, C48, C35, and C49 can be adjusted to minimize the radiated interference value generated by the system. In this embodiment, C34 and C35 are 1.5 uF, and C48 and C49 are 0.012 uF.

[0157] As Figure 24 shown, the rectifier circuit is used to convert the mains power input to the hand dryer into direct current; the auxiliary power supply circuit is used to convert the direct current generated by the rectifier circuit into different voltage values for powering each component included in the hand dryer control system.

[0158] As Figure 26As shown in the figure, the infrared induction circuit is used to receive the signals from the infrared sensor. When the user places their hand on the air outlet sensing area of the hand dryer, the signals are transmitted to the MCU control unit. The infrared induction circuit consists of an infrared receiving circuit formed by pin 5 of the access terminal CN7 of the infrared sensor, resistor R23, resistor R24, resistor R105, triode Q4, triode Q5, capacitor C10, capacitor C11, infrared signal output terminal RX, and infrared signal control terminal RT. Among them, pin 5 of the access terminal CN7 of the infrared sensor is connected to the infrared sensor signal output on the hand dryer (not shown), the infrared signal output terminal is connected to the fourth I / O port of the MCU control unit, and the infrared signal control terminal is connected to the sixth I / O port of the MCU control unit.

[0159] To prevent the infrared sensor from being interfered with and causing the system to malfunction, the internal program of the MCU chip in the MCU control unit is set as follows: The sixth I / O port of the MCU control unit sends a square wave signal with a fixed frequency to the base of triode Q5 through the infrared control terminal. When the base of triode Q5 is at a high level, it is detected whether the fourth I / O port of the MCU control unit connected to the infrared signal output terminal is at a low level. If the infrared signal output terminal is at a low level, it is considered that the infrared sensor has sensed an object. If the infrared signal output terminal is at a high level, it is considered that the infrared sensor has not sensed an object.

[0160] As Figure 26 shown in the figure, the heating function switching circuit is used to switch the heating or non-heating function and transmit the signal of the heating function switching button on the hand dryer panel to the MCU main control unit; Figure 26 Among them, JR1 is the heating function indication receiving end, and JR2 is the heating function switching signal.

[0161] As Figure 24 shown in the figure, the bus voltage detection circuit is used to convert the direct current generated by the rectifier circuit into a low voltage signal that can be detected by the MCU control unit and transmit it to the MCU control unit. In this embodiment, the direct current generated by the rectifier circuit is about 311V. The voltage is converted into the range of 0 - 3.3V through a voltage division circuit so that the MCU can detect it. The purpose of setting the bus voltage detection circuit is to generate an alarm when detecting that the mains voltage is too low or too high. The system stops working when the mains voltage is too low or too high to protect the system.

[0162] As Figure 24 shown in the figure, the temperature detection circuit transmits the temperature signal detected by the temperature sensor installed at the air outlet of the hand dryer to the MCU control unit. When the temperature is too high, the heating power of the heating wire is reduced. When the temperature is too low, the heating power of the heating wire is increased to enable the user to obtain a comfortable and constant temperature. In this embodiment, it can be an NTC temperature sensor.

[0163] As Figure 27As shown in the figure, the LED display control circuit is used to turn on or off the LED lights installed on the hand dryer under the control of the MCU control unit. Different lighting or extinguishing frequencies correspond to different faults, which is convenient for inspection or maintenance. The LED display control circuit consists of pin 2 of the LED lamp access terminal CN9 indicating the power-on function, pin 3 of the LED lamp access terminal CN9 indicating the fault function, resistor R31, resistor R32, triode Q6, triode Q7, the fault signal input terminal GZ, and the power-on signal input terminal DY. Among them, pin 2 of the LED lamp access terminal CN9 indicating the power-on function and pin 3 of the LED lamp access terminal CN9 indicating the fault function are respectively connected to the corresponding LED lights on the hand dryer. The power-on signal input terminal is connected to the fifteenth I / O port of the MCU control unit, and the fault signal input terminal is connected to the sixteenth I / O port of the MCU control unit.

[0164] The internal program of the MCU chip in the MCU control unit is set as follows: If the hand dryer is connected to the mains power and receives the power-on signal input terminal of the fifteenth I / O port of the MCU control unit, the LED lamp indicating the power-on function will be constantly on; if there is a fault in the system, under the control of the MCU control unit, the fault signal input terminal controls the LED lamp indicating the fault function to display the corresponding fault signal. In order to make the LED lamp indicating the fault function display different fault types, the MCU control unit makes the LED lamp have different flashing frequencies. Users or maintenance personnel can identify the fault types of the hand dryer according to the different flashing frequencies of the LED lamp, quickly diagnose and process, which is convenient for maintenance. In this embodiment, it is not necessary to use multiple fault lights to correspond to display multiple fault types. The design scheme that only one fault LED lamp can display multiple fault types can save the system cost and simplify the circuit structure.

[0165] As Figure 24 shown in the figure, the debugging and downloading port circuit is used for debugging and programming.

[0166] As Figure 24 shown in the figure, the current limiting protection circuit is used to amplify the detected current of the motor coil winding, compare it with the first set value, and then transmit it to the MCU control unit. The MCU control unit determines the conduction or cut-off of the two-phase switched reluctance motor coil according to the comparison result.

[0167] As Figure 24 shown in the figure, the overcurrent protection circuit is used to compare the amplified current of the motor coil winding with the second set value and then transmit it to the MCU control unit. If the current does not drop below the second set value within the specified time, the MCU control unit will stop the motor from working and display the corresponding fault signal through the LED lamp; for example, if the motor coil is short-circuited, the power supply to the motor will be cut off to stop it from working.

[0168] As Figure 29As shown, the rotor position signal detection circuit is used to transmit the received position signal of the motor rotor to the MCU control unit. It includes the rotor position signal sensor input interface J1, resistors R37, R38, R40, R41, capacitors C14, C15, C16, diodes D8, D81, D9, D91, the position A signal output terminal WZA, and the position B signal output terminal WZB. Among them, the rotor position signal sensor input interface J1 is connected to the position sensor on the two-phase switched reluctance motor, the position A signal output terminal is connected to the eighteenth I / O port of the MCU control unit, and the position B signal output terminal is connected to the nineteenth I / O port of the MCU control unit.

[0169] In the above specific embodiments, the purpose, technical solution, and beneficial effects of the present invention have been further described in detail. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention. In the description of the present invention, it should be understood that the terms indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0170] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, or the orientation or position relationship when the product of the present invention is usually placed. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0171] In the present invention, unless otherwise clearly specified or limited, the first feature being above or below the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through additional features therebetween. The first feature being above, on top of, and over the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the horizontal height of the first feature is higher than that of the second feature. The first feature being below, beneath, and under the second feature includes the first feature being directly below and obliquely below the second feature, or merely means that the horizontal height of the first feature is less than that of the second feature.

Claims

1. A switched reluctance motor, characterized in that, Comprising: A housing, an end cap mating with the housing, a stator assembly disposed within the housing, and a rotor assembly installed inside the stator assembly and located between the housing and the end cap; Wherein At the bottom of the housing, there is a first bearing chamber adapted to be assembled with a rear bearing on the rotor assembly; and at the center of the end cap, there is a second bearing chamber adapted to be assembled with a front bearing on the rotor assembly; and At one end of the stator assembly close to the end cap, there is also a detection component, and on the rotor shaft of the rotor assembly, there is also a measured component adapted to be detected by the detection component; The detection component includes two adjacent Hall sensors; Both of the two Hall sensors are mated with a Hall PCB board through the same Hall bracket; the Hall PCB board is assembled on a bobbin; The Hall bracket is adapted to be fixedly mated with the Hall PCB board; and On the Hall bracket, there are a plurality of through holes adapted to be respectively penetrated by a plurality of pins of the Hall sensor one by one, and the pins of the Hall sensor are adapted to be bent and penetrate through the through holes and then be mated with the Hall PCB board; On the end face of the Hall bracket facing away from the Hall PCB board, there are also a plurality of guiding grooves respectively corresponding to and mating with the plurality of through holes; The groove path of the guiding groove is in a bent structure relative to the axis of the through hole, so as to be adapted to guide the pre-bent pins of the Hall sensor to be inserted into the through holes or guide the pins of the Hall sensor to be bent in the guiding grooves and then inserted into the through holes; On the Hall PCB board, there are a plurality of pad holes respectively corresponding to and mating with the plurality of through holes on the Hall bracket.

2. The switched reluctance motor according to claim 1, wherein The stator assembly includes: a stator core, a bobbin integrally injection-molded with the stator core, a coil adapted to be wound and installed on the bobbin, and a terminal adapted to be inserted into the bobbin; wherein The detection component is assembled on the bobbin; The stator core is composed of a plurality of silicon steel sheets laminated, and the stator core as a whole is in a substantially circular structure; A plurality of protrusions protruding radially outward are uniformly arranged in the circumferential direction of the stator core, and the protrusions are in interference fit with the housing; and An axially penetrating through hole is provided in the protrusion, and a plurality of stator salient poles are formed by the inner circle of the stator yoke of the stator core extending inward.

3. The switched reluctance motor according to claim 2, wherein, A plurality of air outlets are provided on the side wall of the housing; and On the inner side wall of the housing, there are also formed a clamping block and a protrusion; wherein The clamping block is adapted to be clamped with one axial end of the stator core, and the protrusion is adapted to be clamped with the other axial end of the stator core.

4. The switched reluctance motor according to claim 2, characterized in that, The measured component is a magnetic ring sleeved on the rotor shaft; One of the two Hall sensors is disposed on the center line of any one stator salient pole, and the other Hall sensor is disposed on the center line of the stator core slot adjacent to the above stator salient pole; The rotor assembly further includes a rotor core sleeved on the rotor shaft; there is a through hole at the center of the rotor core, and there are a plurality of rotor salient poles with the same structure on the circumferential outer side of the rotor core.

5. The switched reluctance motor according to claim 4, wherein There are two symmetrically distributed rotor salient poles on the circumferential outer side of the rotor core; and the air gap between one end of the outer circle side of any one rotor salient pole and the inner circumference of the stator core is b1, and the air gap between the other end of the outer circle side of the rotor salient pole and the inner circumference of the stator core is b2; When the rotor assembly rotates counterclockwise, b1 > b2; when the rotor assembly rotates clockwise, b2 > b1; and The outer circle of the magnetic ring is provided with two pairs of evenly distributed N poles and S poles; and each pair of N poles and S poles corresponds to a rotor salient pole.

6. The switched reluctance motor according to claim 5, wherein, The included angle of the fan-shaped side formed between the dividing line of any pair of N poles and S poles and the end with a smaller air gap between the outer circle side of the rotor salient pole and the inner circumference of the stator core is 20° to 50°.

7. The switched reluctance motor according to claim 2, characterized in that, The detection component includes two adjacent optoelectronic switches, and the component to be measured is a light-shielding plate sleeved on the rotor shaft; Both optoelectronic switches are fixed on the same optoelectronic PCB board, and the optoelectronic PCB board is assembled on the coil bobbin; One of the two optoelectronic switches is arranged on the center line of any stator salient pole, and the other optoelectronic switch is arranged on the center line of the stator core slot adjacent to the above stator salient pole; The rotor assembly further includes a rotor core sleeved on the rotor shaft; there is a through hole in the center of the rotor core, and there are a plurality of rotor salient poles with the same structure on the circumferential outer side of the rotor core.

8. The switched reluctance motor according to claim 7, wherein There are two symmetrically distributed rotor salient poles on the circumferential outer side of the rotor core; and the air gap between one end of the outer circle side of any rotor salient pole and the inner circumference of the stator core is b1, and the air gap between the other end of the outer circle side of the rotor salient pole and the inner circumference of the stator core is b2; When the rotor assembly rotates counterclockwise, b1 > b2; when the rotor assembly rotates clockwise, b2 > b1; and The light-shielding plate includes a circular base sleeved on the rotor shaft, and a pair of arc-shaped baffles symmetrically distributed in the circumferential direction of the base; the pair of arc-shaped baffles are distributed in one-to-one correspondence with the two rotor salient poles.

9. The switched reluctance motor according to claim 8, characterized in that, The included angle of the fan-shaped side formed between one edge of any arc-shaped baffle along the radial direction of the rotor shaft and the end with a smaller air gap between the outer circle side of the rotor salient pole and the inner circumference of the stator core is 20° to 50°.

10. A fan, characterized in that, Including: The switched reluctance motor, air deflector, fan blade and air shroud according to any one of claims 1 to 9; The air shroud is installed on the flange of the housing of the reluctance motor, and there is an air inlet at the center hole at one end of the air shroud; The fan blade is fixed at one end of the rotor shaft and is located between the air shroud and the air deflector; and There is a center hole in the middle of the air deflector so that one end of the rotor shaft passes through the center hole to fix the fan blade.

11. A hand dryer, characterized in that, Including: A housing and a blower as claimed in claim 10 provided in the housing; And A controller adapted to control the operation of the blower is further provided in the housing.

12. The hand dryer according to claim 11, characterized in that, The controller includes: a control board, a controller housing and a controller cover; wherein The control board is fixed in the controller housing and the controller cover; The control board includes a control PCB board; a weak electricity area and a strong electricity area are provided on the control PCB board; The weak electricity area extends from one side of the control PCB board to the middle; the strong electricity area is distributed around the weak electricity area.

13. The hand dryer according to claim 12, wherein, Inside the low-voltage area, there are an MCU control unit, a temperature detection circuit, an infrared induction and heating power switching circuit, a debugging and downloading port circuit, a rotor position signal detection circuit, an LED display control circuit, a current amplification and chopping circuit, an auxiliary power supply circuit, a bus voltage detection circuit, and an overcurrent protection circuit; Inside the high-voltage area, there are a rectification circuit, a two-phase asymmetric half-bridge circuit, and a heating wire control circuit.

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