WO2010121407A1

WO2010121407A1 - Special motor for dishwasher and water pump assembly using it

Info

Publication number: WO2010121407A1
Application number: PCT/CN2009/071357
Authority: WO
Inventors: 纪树海; 汶志杰; 许志坚; 曾茂森
Original assignee: 深圳市拓邦股份有限公司
Priority date: 2009-04-20
Filing date: 2009-04-20
Publication date: 2010-10-28
Also published as: CN102037633A; CN102037633B

Abstract

A special motor for dishwasher comprises a motor body (2) and a variable frequency driving unit (3) connected to one end of the motor body (2). The motor body (2) comprises a stator (22), a rotor (23) matching with the stator (22) and a middle cover (24) fixedly connected with the stator (22). The variable frequency driving unit (3) comprises a back end cover (31) and a variable frequency driving controller (32). The back end cover (31) is fixedly connected to the middle cover (24) and the variable frequency driving controller (32) is accommodated between the back end cover (31) and the middle cover (24). A water pump assembly using the special motor for dishwasher is a three segments connecting structure composed of a water pump (1), the motor body (2) and the variable frequency driving unit (3). The water pump (1) is connected to the other end of the motor body (2). The variable frequency driving unit (3) drives the water pump (1) to work by the motor body (2) and controls the frequency-conversion and speed-adjusting of the motor body (2).

Description

Instruction manual Dishwasher-specific motor and water pump assembly using the same

#细 or

[1] The present invention relates to the field of dishwashers, and more particularly to a dishwasher-dedicated motor and a water pump assembly using the same.

[2] The dishwasher is used to automatically clean the residual stains on the tableware, which is very convenient for people's lives.

In the existing domestic dishwashers, an asynchronous motor is often used as the power system of the main water pump, and the main water pump is driven to wash the dishes according to the needs of the washing mode. However, the use of asynchronous motors as the power system of the dishwasher water pump has the following disadvantages: large weight, short life, many failures, high installation requirements, small voltage range, and poor speed regulation performance, low efficiency (50%~60) %) , the connection structure with the main water pump is complicated and the reliability is poor.

[3] In order to improve the complexity of the existing asynchronous motor, the weight is large, and the power loss of the motor is large, the Chinese invention patent CN2827259Y discloses a dishwasher with a heat dissipation weight reduction structure of the rotor core of the motor, and the invention patent passes A plurality of heat dissipation and weight reduction holes are arranged on the electronic rotor core, which reduces the weight of the motor rotor, reduces power loss, and improves heat dissipation while ensuring constant torque. However, the motor of the dishwasher only reduces the weight of the asynchronous motor by providing a plurality of heat-dissipating weight-reducing holes, and does not improve the structure of the dishwasher from the structure and principle, and therefore cannot effectively solve the existing structure of the asynchronous motor. Complex, heavy, high installation requirements, and poor speed regulation and low efficiency, and no improvement in connection with the pump.

[4] One of the technical problems to be solved by the present invention is to provide a dishwasher for the above-mentioned existing dishwasher using an asynchronous motor as a power system of the water pump, which has complicated structure, poor speed regulation performance and low efficiency. Special motor, using DC brushless motor with variable frequency drive controller, its structure is simple and reasonable, and it can realize frequency conversion speed regulation, high efficiency and energy saving.

[5] Another technical problem to be solved by the present invention is to provide a water pump assembly using the above-mentioned dishwasher-dedicated motor in view of the above-mentioned problems of complicated installation and poor reliability of the conventional asynchronous motor and the water pump. The motor and the water pump form a three-stage connection structure, and the structure is simple and reliable.

[6] The technical solution adopted by the present invention to solve one of the technical problems is to provide a dishwasher-dedicated motor, including a motor body, the motor body including a stator, a rotor disposed in cooperation with the stator, and a fixed connection with the stator a middle cover; a variable frequency drive unit is connected to one end of the motor body, the variable frequency drive unit includes a rear end cover, and a variable frequency drive controller; the rear end cover is fixedly connected with the middle cover, and the variable frequency drive controller is received in the rear cover Between the end cap and the middle cover.

[7] In the dishwasher-dedicated motor of the present invention, the outer side of the middle cover is provided with a plurality of asymmetric first external lugs, and the rear end cover is correspondingly provided with a plurality of asymmetric second external connections. The lugs are respectively oppositely connected to the plurality of first external lugs to securely connect the rear end cover to the middle cover.

[8] In the dishwasher-dedicated motor of the present invention, the internal three-phase winding of the stator is provided with a lead wire, and the lead wire is connected to the drive controller PCB assembly; the variable frequency drive controller further includes a power signal line component, the power signal line component includes a power line and a signal line, one end of the power line and the signal line is connected to a driving controller PCB component, and the other end is externally connected to a power source and a signal source; the driving control The PCB assembly converts the power input from the power line into a three-phase power supply and supplies it to the stator to generate a rotating magnetic field to drive the rotor to rotate. Similarly, it receives the frequency signal input from the signal line and changes the rotational speed of the rotor by changing the frequency of the rotating magnetic field of the stator.

[9] In the dishwasher-dedicated motor of the present invention, the motor body is further provided with a PCB lead wire assembly

The PCB lead wire assembly is fixedly connected to the stator, and includes a PCB board, a terminal mating plug, and the lead wire, one end of the lead wire is soldered on the PCB board, and the other end is connected to the terminal butt plug; The controller PCB assembly includes a driving PCB board and a terminal docking socket disposed on the driving PCB board, wherein the driving PCB board is provided with a power supply part for supplying three-phase voltage to the stator and for converting the input power frequency to control the rotor speed a control unit, the one side of the terminal docking socket is plugged into the terminal mating plug; one end of the power line of the power signal line assembly is connected to the other side of the terminal docking socket corresponding to the power source part, The other end is provided with a power input interface and an external power supply is disposed through the rear end cover. One end of the signal line is connected to the driving PCB board corresponding to the control part, and the other end is provided with a control signal line interface and passes through the back end. Cover the external signal source.

[10] In the dishwasher-dedicated motor of the present invention, the drive controller PCB assembly is fixed to the rear end of the middle cover and received in the rear end cover, and the outer side of the middle cover is convexly provided with the first door Shape structure, the first gate structure a front end of the rear end cover is provided with a first door-shaped structure corresponding to the first door-shaped structure of the middle cover, and a bottom end of the second door-shaped structure is provided with respect to the first half hole The second half hole is formed with a door hole through which the power line and the signal line of the power signal line assembly pass through the rear end cover.

[11] In the dishwasher-dedicated motor of the present invention, the magnetic material of the rotor is made of four, six or eight pieces of neodymium iron boron magnetic tile structure; The steel sheet is made of a plastic structure, which is made of laminated silicon steel sheets, a matching hole for mounting the rotor is disposed at a portion thereof, and a magnet wire is disposed around the matching hole, and a side surface of the PCB board of the P CB lead wire assembly is correspondingly disposed There are a plurality of bosses, and the electromagnetic wires are connected to the plurality of bosses. Further, the two ends of the stator are convexly provided with a structure boss for protecting the electromagnetic wires, and the outer side thereof is further provided with Ground terminal.

[12] The technical solution adopted by the present invention to solve another technical problem thereof is: providing a water pump assembly using the above-mentioned dishwasher-dedicated motor, and a water pump connected to the other end of the motor body, the water pump motor body And the variable frequency drive unit constitutes a three-stage connection structure, and the variable frequency drive unit drives the water pump to work by the motor body and performs frequency conversion and speed regulation on the motor body.

[13] In the water pump assembly of the present invention, the motor body further includes a front end cover fixedly coupled to the stator, the water pump includes a mounting seat and a water pump body disposed on the mounting seat; Correspondingly, the mounting seat is provided with a plurality of card slots, wherein the corresponding hooks are respectively placed in the plurality of card slots, the mounting seat is fastened to the front end cover, and the water pump is fixed to the motor body. connection.

[14] In the water pump assembly of the present invention, the rotor is provided with a rotating shaft, and a front end of the rotating shaft is provided with a connecting portion, and a mounting seat of the water pump is correspondingly provided with a mounting portion, and the connecting portion passes through the front end cover Cooperating with the mounting portion; a rear end of the rotating shaft is provided with a matching portion, and a middle portion of the rear end cover is correspondingly provided with a mounting passage, the engaging portion passes through the middle cover, drives the controller PCB assembly, and is inserted into the In the installation channel, the connection between the rotating shaft and the mounting seat is adjusted by installing the rotating shaft of the channel to adjust the installation state of the motor and the water pump.

[15] In the water pump assembly of the present invention, the front end cover, the middle cover, and the rear end cover are flame-retardant plastic parts or metal parts, and the end surface thereof is provided with a mesh structure for weight reduction and heat dissipation, and a bearing chamber for mounting a bearing is disposed at a middle portion of the front end cover and the middle cover, the bearing chamber has a regular twelve-sided shape, and the end portion is provided with a through hole for the rotating shaft to pass through the front end cover and the middle cover; a threaded portion is provided, and the mounting portion of the mounting seat is correspondingly provided with a threaded hole, and the connecting portion of the rotating shaft passes through the through hole of the front end cover and is screwed to the mounting portion; the middle portion of the driving PCB board is provided with a through hole, The front end of the mounting channel is corresponding to the through hole of the driving PCB board and The through hole is inserted into the through hole, and the engaging portion of the rotating shaft passes through the through hole of the middle cover and is inserted into the mounting channel.

[16] The beneficial effects of the dishwasher-dedicated motor of the present invention and the water pump assembly using the same:

[17] First, the structure is simple, reasonable, light weight: The dishwasher-specific motor is a DC brushless motor, including the motor body and the variable frequency drive controller. The water pump and the water pump always form a three-stage structure. And the rear end cover, the fixed connection of the water pump, the motor body and the variable frequency drive controller is realized, and the variable frequency drive controller is housed in the rear cover and the middle cover, and the installation is reliable, and the rotation shaft can also be rotated through the installation passage of the rear end cover Adjusting the installation state of the rotating shaft and the water pump, the structure is reasonable, compact, practical, and can achieve a good installation state; the inverter control is performed by checking the position of the rotor of the motor by the back electromotive force, without the Hall sensor, and the motor The front end cover, the middle cover and the rear end cover are all provided with a mesh structure, which is advantageous for heat dissipation and weight reduction. Therefore, the DC brushless motor is light in weight, which is only one third of the weight of the asynchronous motor.

[18] Second, frequency control, high efficiency and energy saving: 直流Using DC brushless motor with variable frequency drive controller, can realize stepless speed regulation through frequency conversion, make the motor work in a wide speed range, and can approach the highest efficiency The point is normal operation, the efficiency is above 75%.

[19] Third, environmental protection, water saving, cleaner cleaning: Because the motor can be frequency-controlled, so that the motor can maintain efficient operation over a wide range of speeds, so the dishwasher can be set to choose a variety of washing modes: For example: normal washing The mode, the strong washing mode, the automatic washing mode, etc., achieve water saving by using different modes of operation, and the tableware improves the washing degree in the strong washing mode, and can fully satisfy the consumer's use requirements.

[20] Fourth, the input voltage range is wide, the intelligent function is strong: By setting the variable frequency drive controller, the input voltage range of the motor is 180VAC~240VAC, the motor can run normally at constant speed, output constant power; and the variable frequency drive controller Inverter control is carried out by checking the position of the rotor of the motor by back electromotive force. In the operation of the dishwasher, it is possible to monitor whether the motor is working normally, so as to control the normal operation of the dishwasher.

Country deletion

[21] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

Figure 1 is a cross-sectional view showing the structure of a water pump assembly in accordance with a preferred embodiment of the present invention;

Figure 2 is a cross-sectional view showing the structure of the motor shown in Figure 1;

[24] Figure 3 is a perspective exploded view of the motor shown in Figure 1;

Figure 4 is a schematic structural view of the stator shown in Figure 3; [26] FIG. 5 is a schematic structural view of the PCB board lead-out assembly shown in FIG. 3;

[27] Figure 6 is a schematic structural view of the front end cover shown in Figure 3;

[28] Figure 7 is a schematic structural view of the middle cover shown in Figure 3;

[29] Figure 8 is a schematic structural view of the variable frequency drive controller shown in Figure 3;

[30] Fig. 9 is a schematic structural view of the rear end cover of Fig. 3.

difficult

[31] As shown in FIG. 1, is a schematic view of a water pump assembly according to a preferred embodiment of the present invention. The improvement of the present invention is a water pump assembly composed of a motor 10 and a motor 10 and a water pump 1, the motor 10 and a water pump. For use in a dishwasher, the illustration only shows the dishwasher-specific motor 10 and its water pump assembly with the water pump 1. The other construction of the dishwasher is similar to the prior art and will not be described here. 2 is a cross-sectional view of the motor of FIG. 1, and FIG. 3 is an exploded perspective view of the motor of FIG. 1. The motor 10 of the present invention is a DC brushless motor, and the power system of the water pump 1 drives the water pump 1 to operate, and The stepless speed regulation is realized by frequency conversion, which comprises a motor body 2 and a variable frequency drive controller 3 connected to the motor body 2. The water pump composed of the water pump 1, the motor body 2 and the variable frequency drive controller 3 always becomes a three-stage assembly structure, the motor The body 2 is fixedly connected with the water pump 1, and the variable frequency drive controller 3 drives the water pump 1 through the motor body 2 to perform frequency conversion and speed regulation of the motor body 2.

[32] Referring to FIGS. 1-3, the motor body 2 includes: a front end cover 21, a stator 22, a rotor 23, a middle cover 24, bearings 251, 252, and a PCB lead wire assembly 26; the front end cover 21 and the middle cover 24 They are respectively disposed at two ends of the stator 22 and assembled with the stator 22 . The rotor 23 is disposed in the middle of the stator 22 , and the PCB lead wire assembly 26 is mounted on the stator 22 . The motor body 2 is assembled by first attaching the PCB board lead-out assembly 26 to the stator 22 through a tapping screw 28, and then sequentially mating the front end cover 21, the bearing 251, the stator 22, the rotor 23, the bearing 252, and the middle cover 24. After assembly, the four sets of mounting screws 271 are fastened to the nut 272.

Referring to FIG. 1-3, the variable frequency drive controller 3 is connected to the rear end of the motor body 2, and includes: a rear end cover 31, a drive controller PCB assembly 32, and a power line signal line assembly 33; The cover 31 is fixedly connected to the middle cover 24 of the motor body 2, and the drive controller PCB assembly 32 is built in, and is fixed to the rear end of the middle cover 24 of the motor body 2 by a tapping screw 34, and the components disposed thereon face the rear end. The cover 31 is received in the rear end cover 31, and a through hole 321 is defined in the middle portion of the rear end cover 31. The front end of the rear end cover 31 is provided with a mounting passage 311, and the front end of the mounting passage 311 is correspondingly disposed and inserted into the through hole 321 The power signal line assembly 33 includes a power line 331 and a signal line 332, and one end of the power line 331 is connected to the driving controller PCB assembly 32. The other end is provided with a power input interface 333 for external power supply, one end of the signal line 332 is connected to the drive controller PCB assembly 32, and the other end is provided with a control signal line interface 334 for external signal source; In the embodiment, by forming a door hole 35 between the rear end cover 31 and the middle cover 24, the power line 331 and the signal line 332 pass through the door hole 35 for externally connecting a power source and a signal source (not shown); The rear end cover 31 is opposite to the outer side of the middle cover 24 of the motor body 2, and three asymmetric second outer lugs 310 and first outer lug 240 are disposed, and are tightly coupled with the nut 362 by three sets of assembly screws 361 The fixed connection, the variable frequency drive controller ₃ is assembled with the motor body 2.

Referring to FIG. 1-3, the water pump 1 is connected to the front end of the motor body 2, and includes: a mounting seat 13 and a water pump body 14 disposed on the mounting seat 13; the front end cover 21 of the motor body 2 is provided with four The plastic hooks 210 are respectively provided with four card slots 130. The corresponding cards of the four hooks 210 are placed in the four card slots 130, and the water pump 1 is assembled with the motor body 2. . In addition, the rotor 23 is provided with a rotating shaft 230. The front end of the rotating shaft 230 is connected to the water pump 1, and the rear end is inserted into the mounting passage 311 in the middle of the rear end cover 31 of the variable frequency drive controller 3, and passes through the rear end cover 31. The mounting passage 311 adjusts the rotating shaft 230 so that the motor 10 and the water pump 1 have a good mounting state. In the embodiment, the front end of the rotating shaft 230 is provided with a connecting portion 231, the connecting portion 231 is provided with a thread, the mounting seat 13 is correspondingly provided with a mounting portion 131, and the mounting portion 131 is provided with a threaded hole, the rotating shaft The connecting portion 231 of the 230 is threadedly connected to the mounting portion 131 of the water pump 1 through the front end cover 21; the rear end of the rotating shaft 230 is provided with a fitting portion 232, and the engaging portion 232 passes through the rear cover 31 and is inserted into the rear end cover 31. In the mounting passage 311, the rotating shaft 230 is rotated by the mounting passage 311, so that the screw connection between the connecting portion 232 of the rotating shaft 230 and the mounting portion 131 of the mounting seat 13 can be adjusted, so that the motor 10 and the water pump 1 have a good mounting state. .

[35] The working principle of the dishwasher-dedicated motor and the water pump assembly using the same: The variable frequency drive controller 3 drives the water pump 1 through the motor body 2 to perform frequency conversion and speed adjustment of the motor body 2. Specifically, the rotor 23 is a permanent magnet, for example: a magnetic material of four, six or eight pieces of neodymium iron boron magnetic tile structure, which is provided with the rotating shaft 230 connected to the water pump 1, the stator 22 internal three-phase windings are provided with lead wires 2 9, the lead wires 29 are connected to the drive controller PCB assembly 32, and the power supply line 331 of the power signal line assembly 33 and one end of the signal line 332 are connected to the drive controller PCB assembly. 32. The other end of the motor 10 is externally connected to a power source and a signal source. The drive controller PCB assembly 32 converts the power input from the power line 331 into a three-phase power source and supplies the stator 22 to generate a rotating magnetic field to drive the rotor 23 to rotate. Pump 1 works, same That is, it receives the frequency signal input from the signal line 332 and changes the rotational speed of the rotor 23 by changing the frequency of the rotating magnetic field of the stator 22 to adjust the amount of water discharged from the water pump 1.

[36] Referring to Figure 4-9, the components and mutual relations between the motor body 2 and the variable frequency drive unit 3 are detailed as follows:

[37] FIG. 4 is a schematic structural view of a stator. The stator 22 is made of a three-phase nine-slot steel sheet and is made of a laminated steel sheet 220. The stator 22 is provided with a matching hole in the middle. 221, for mounting the rotor 23; a magnet wire 222 is disposed around the matching hole 221, and a structural boss 223 for protecting the electromagnetic wire 222 is protruded from both end faces thereof, and the structure boss 223 is made of plastic; Mounting holes 224 for assembling and connecting the front end cover 21 and the middle cover 24 are respectively provided at the diagonal corners; and a grounding terminal 225 is provided on the outer side thereof, and the grounding terminal 225 is riveted to the laminated steel sheet 220 by rivets 229. It is worth mentioning that the stator 22 is provided with a positioning structure for mounting the PCB lead wire assembly 26. In the embodiment, the positioning structure comprises two sets of symmetrically disposed positioning posts 226 and screw posts 227, the screws A threaded bore 228 is provided in the middle of the post 227.

[38] FIG. 5 is a schematic structural view of a PCB board lead-out assembly. The PCB board lead-out assembly 26 is fixedly coupled to the stator 22 for extracting three-phase windings inside the stator 22, which includes a PCB board 261 and a terminal. The plug 262 and the lead wire 29 are butted. A plurality of symmetrical positioning holes 263 and mounting holes 264 are disposed on the PCB 261. The positioning holes 263 are disposed on the positioning post 226 of the stator 22 and are disposed on the positioning post 226. The mounting hole 264 is disposed on the positioning post 226. Corresponding to the screw post 227 on the stator 22, the mounting hole 264 is correspondingly connected with the screw hole 228 on the screw post 227 by the tapping screw 28 to fix the PCB board 261 to the stator 22; The board 261 can be an existing PCB board of various shapes, and has three bosses 265 on the side thereof. The magnet wires 222 of the stator 22 are soldered to the three bosses 265, and the three bosses 265 are powered. The terminal 29 is electrically connected to the lead wire 29 and is led out through the lead wire 29; one end of the lead wire 29 is soldered on the PCB board 261, and the other end is connected to the terminal mating plug 262, and the terminal mating plug 262 is used for connection driving control. The PCB assembly 32 is such that the stator 22 is connected to the drive controller PCB assembly 32 through the PCB board lead-out assembly 26, and it can be understood that the lead-out line 29 can be made in addition to being connected through the PCB board 261. The plastic pin or the inlaid spring piece is taken out and connected to the drive controller PCB assembly 32.

[39] FIG. 6 is a schematic structural view of a front end cover. The front end cover 21 is a flame-retardant plastic member, and is disposed in cooperation with the stator 22. The end surface is a mesh structure 211, which is advantageous for weight reduction and heat dissipation; There is a dodecagonal bearing chamber 212 for mounting the bearing 251, and a bearing chamber 251 is mounted in a dodecagonal bearing chamber, so that the bearing is mounted reliably, and the end of the bearing chamber 212 is provided with a perforation (not shown). Shown for the rotor 23 The rotating shaft 230 passes through the front end cover 21; the four opposite corners are respectively provided with positioning posts 213 for assembling and connecting the stator 22. The four positioning posts 213 are convexly disposed toward the stator 22, respectively, from the front end of the stator 22. The front mounting cover 21 and the stator 22 are assembled in the four mounting holes 224 of the stator 22, and the central portion of the positioning post 213 is provided with a through hole 214 for the front end cover 21 and the stator after the mounting screw 271 is worn. 22 fixed connection; In addition, the front end surface is provided with four plastic hooks 210 for assembling the connection water pump 1.

[40] FIG. 7 is a schematic structural view of a middle cover. The middle cover 24 is a flame-retardant plastic member, and is disposed in cooperation with the stator 22. The end surface is a mesh structure 241, which is advantageous for weight reduction and heat dissipation; a bearing chamber (not shown) having a dodecagon shape for mounting the bearing 252; and an end portion of the bearing chamber is provided with a through hole 242 for the shaft 230 of the rotor 23 to pass through the middle cover 24; Positioning posts 243 for assembling and connecting the stators 22 are respectively disposed at opposite corners. The four positioning posts 243 are convexly disposed toward the stator 22, and are respectively inserted into the four mounting holes 224 of the stator 22 from the rear end of the stator 22. The middle cover 24 is assembled with the stator 22, and the middle portion of the positioning post 243 is provided with a through hole 244 for fixing the middle cover 24 and the stator 22 after the mounting screw 271 is worn. It is worth mentioning that A fixing structure for mounting the drive controller PCB assembly 32 is disposed on the rear end surface of the middle cover 24. In the embodiment, the fixing structure is two sets of symmetrically disposed positioning posts 2451, a hook 2452, and a screw post 2453. Threaded in the middle of column 2453 a first door-shaped structure 246 is disposed on the outer side of the middle cover 24, and a front end of the first door-shaped structure 246 is extended with a mating block 2460. The front end of the mating block 2460 is provided with a first half-hole 2461 and two connecting posts 2462. In this embodiment, the first half hole 2461 has a semi-arc shape for forming the power supply signal line assembly 33 to pass through. In addition, the three outer first flanges 240 are disposed on the outer side of the middle cover 24, and the middle portion of the first outer lug 240 is provided with a threaded hole 2401 for the middle cover 24 to be worn after the assembly screw 361 is worn. The rear end cover 31 is fixedly connected.

[41] FIG. 8 is a schematic structural diagram of a drive controller PCB assembly. The drive controller PCB assembly 32 includes a drive PCB board 320, and a terminal docking socket 322 disposed on the drive PCB board 320. The drive PCB board The through hole 321 is disposed in the middle of the cover portion 321 for inserting the mounting channel 311 of the rear end cover 31; the hooks 2452 of the middle cover 24 are respectively engaged with the two sides of the driving PCB board 320, The driving PCB board 320 is provided with two sets of positioning holes 323 and mounting holes 324. The positioning holes 323 are correspondingly disposed on the positioning post 2451 of the middle cover 24 and are disposed on the positioning post 2451. The mounting holes 324 are middle and middle. The screw post 2453 of the cover 24 is correspondingly disposed, and the mounting hole 324 is correspondingly connected with the threaded hole 2454 of the screw post 2453 by the self-tapping screw 34 to fixedly connect the driving PCB board 320 to the middle cover 24; The driving PCB board 320 is further provided with Two connection holes 325 of the signal line 332 of the power line signal line assembly 33 are connected. The terminal docking socket 322 is used for plugging the terminal mating plug 262 of the PCB board outlet assembly 26 and the power cord 3 31 of the power line signal line assembly 33, and the terminal mating plug 262 is plugged into the terminal docking socket 322. The front end of the power line signal line assembly 33 is plugged into the rear end of the terminal mating socket 322. The other components of the drive controller PCB assembly 32 are not shown, and can be implemented by the prior art. .

Referring to FIG. 2 and FIG. 9, the rear end cover 31 is a flame-retardant plastic member, and is disposed in cooperation with the middle cover 24. The end surface of the rear cover 31 is a mesh structure 312, which is advantageous for weight reduction and heat dissipation; 313, for accommodating the drive controller PCB assembly 32 and the power line signal line assembly 33; the outer side of the first door-shaped structure 24 corresponding to the middle cover 24 is provided with a second gate structure 316, the second gate structure 316 The front end corresponding to the first gate structure 246 is provided with a matching groove 3160. The bottom end of the matching groove 3160 is provided with a second half hole 3161 with respect to the first half hole 2461. The second half hole 3161 has a semicircular arc shape corresponding to the two connections. The column 2462 is provided with two connecting holes (not shown), and the two connecting posts 2462 are correspondingly inserted into the two connecting holes, and the first half hole 2461 and the second half hole 3161 are matched to form the door hole 35, The power supply signal line assembly 33 is disposed; the outer side of the rear end cover 31 is disposed corresponding to the three first external lugs 240 of the middle cover 24, and the three second external lugs 310 are disposed. a threaded hole (not shown) in the middle, the assembly screw 361 corresponding to the external through the second lug 3

a threaded hole of 10 and a threaded hole 2401 of the first outer lug 240 of the middle cover 24, and fastened by a nut 362 to fasten the rear end cover 31 and the middle cover 24; it is worth mentioning that the rear The front end of the end cover 31 is provided with the mounting channel 311. The front end of the mounting channel 311 is disposed corresponding to the through hole 321 of the driving PCB board 320 and is inserted into the through hole 321 . The rotating shaft 230 of the rotor 23 passes through the middle cover. The through hole 242 of the 24 is inserted into the mounting passage 311, and the rotating shaft 230 can be adjusted through the mounting passage 311 for connecting the water pump.

As can be seen from the above, the variable frequency drive controller 3 of the present invention drives the water pump 1 through the motor body 2 to perform variable frequency speed regulation on the motor body 2; wherein the drive controller PCB assembly 32 is an important control component, the drive controller PCB assembly The driving PCB board 320 of 32 is provided with a power supply unit and a control unit (not shown). The power supply line 331 of the power signal line assembly 33 is connected to the power supply unit for supplying power, and the signal line 332 is connected to the control. For input and output frequency signals, the power supply unit is used to supply three-phase power to the stator of the motor, and the control unit converts the input power frequency to control the rotational speed of the rotating shaft 230 as required. The power supply unit can be input as a direct current or as an alternating current. If the input is alternating current, it must be converted to direct current by the converter. Whether the direct current input or the alternating current input is to be input to the motor, the direct current voltage must be converted from the inverter to the three-phase. Voltage. In this embodiment, the power supply unit is provided with a converter and an inverter, and an alternating current input is used. The power supply line 331 of the power line signal line assembly 33 is connected to the alternating current power supply and supplied to the power supply unit, and the input voltage range is 180 VAC. ~240VAC, and then converted into a DC voltage by the converter, and then converted into a three-phase voltage by the inverter to drive the motor. The circuit structure of the converter and the inverter can be realized by the prior art. Generally, the The inverter includes six power transistors (Q1~Q6) divided into an upper arm (Ql, Q3, Q5) and a lower arm (Q2, Q4, Q6) for connecting the three-phase winding of the stator 22, and outputting a three-phase voltage to The stator 22 three-phase winding, after the three-phase winding of the stator 22 is connected to the three-phase voltage, a rotating magnetic field is generated. Since the rotor 23 of the brushless DC motor is a permanent magnet, the charging direction of the stator three-phase winding is sequentially changed by the inverter. The alternating magnetic field generated by the charging winding cuts the rotor winding, thereby generating an induced current in the rotor winding, and the rotor magnet generates an electromagnetic force under the rotating magnetic field of the stator, thereby forming an electromagnetic force on the rotating shaft. The torque, the rotating shaft 230 rotates, and is used to drive the water pump 1 to work. Similarly, the signal line 331 of the power line signal line component 33 is connected to the signal source to provide a frequency signal to the control unit, and the control unit provides PWM (pulse width modulation) to determine the switching frequency of the six power transistors (Q1 to Q6) and The inverter is commutated to control the speed of the rotating shaft. The control unit uses the variable frequency speed closed-loop control mode to control the input frequency range of the signal line interface 334 (11 0HZ-160HZ). The operating speed range of the control unit is (2200RPM-3200RPM). ), the relationship between frequency and speed is (frequency 1HZ corresponding speed 20RPM), and the rotor position is detected by the back electromotive force to perform inverter control. Therefore, the motor can be frequency-controlled by the control unit, and the water output of the water pump 1 can be changed. The motor can be operated efficiently over a wide range of speeds, and the dishwasher can be arbitrarily selected according to the water discharge amount of the water pump 1. It is worth mentioning that the principle of detecting the position of the rotor by using the counter electromotive force lies in In the three-phase winding of any engraved stator, two phase windings are energized, one phase winding is not energized, and the non-energized stator winding cuts the rotor The field generates an induced electromotive force, and the current direction is obtained by comparing the voltages across the windings that are not energized, and then the rotor position is determined by the right-hand rule to obtain the rotor position. The position of the rotor is detected by the back electromotive force, and the Hall sensor is not required to further simplify the structure. . The components of the above-mentioned driving controller PCB assembly 32 and the circuit connection thereof can be realized by the prior art, and the driving and frequency conversion speed regulation of the motor can be realized.

[44] In addition, it is worth mentioning that the front end cover 21, the middle cover 24, and the rear end cover 31 may be made of a metal material; the motor body 2 and the variable frequency drive controller 3 may be designed to be separated. The structural form, the internal three-phase winding of the motor body 2 is taken out by the PCB board lead-out assembly, and the drive controller P of the variable frequency drive controller 3 The CB component 32 is connected, and the electrical connection between the variable frequency drive controller 3 and the motor body 2 can be realized, and the motor body 2 can be driven and frequency-controlled by the variable frequency drive controller 3; the internal three-phase winding of the motor body 2 The lead wire can be made into an injection molded pin or a mounted spring piece in addition to being taken out by a PCB board connection.

[45] In summary, the dishwasher-dedicated motor and the water pump assembly using the same have the following advantages: First, the structure is simple, reasonable, and light: the dishwasher-dedicated motor is a DC brushless motor, The utility model comprises a motor body and a variable frequency drive controller, wherein the water pump and the water pump form a three-stage structure, and the front end cover and the rear end cover are arranged to realize a fixed connection between the water pump, the motor body and the variable frequency drive controller, and the variable frequency drive controller It is housed in the rear end cover and the middle cover, and the installation is reliable. In addition, the rotation axis of the rear end cover can be used to adjust the installation state of the rotating shaft and the water pump, so that the structure is reasonable, compact, and practical; Inspect the position of the rotor of the motor for inverter control, no Hall sensor is required, and the front end cover, the middle cover and the rear end cover of the motor are provided with a mesh structure, which is beneficial for heat dissipation and effectively reduces weight, so the DC The brushless motor is light in weight, only one-third of the weight of the asynchronous motor. Secondly, frequency control, energy-efficient: 釆Using DC brushless motor with variable frequency drive controller, stepless speed regulation can be realized by frequency conversion, the motor can work in a wide speed range, and can operate normally close to the highest efficiency point, and the efficiency is above 75%; Environmentally friendly water-saving and cleaner washing: Since the motor can be frequency-controlled, the motor can operate efficiently over a wide range of speeds, so the dishwasher can be set to a variety of washing modes: eg normal washing mode, strong washing mode , automatic washing mode, etc., by using different modes of operation to achieve water saving, and the tableware in the strong washing mode improves the cleaning degree, can fully meet the consumer's use needs; In addition, the input voltage range is wide, the intelligent function is strong: Set the variable frequency drive controller, the input voltage range of the motor is 180VAC~240VAC, the motor can run normally at constant speed and output constant power; and the variable frequency drive controller checks the position of the rotor of the motor through the back electromotive force for inverter control. The dishwasher can monitor whether the motor is working properly. In order to control the normal operation of the dishwasher.

While the invention has been described with respect to the embodiments of the present invention, it will be understood that Therefore, the invention is not limited to the specific embodiments disclosed, but all the embodiments falling within the scope of the appended claims.

Claims

Claim

[1] A dishwasher-dedicated motor, comprising: a motor body (2), the motor body

(2) Include stator (22), rotor (23) with stator (22), and stator

(22) Fixed connection middle cover (24); variable frequency drive unit connected to the motor body (2)

(3) The variable frequency drive unit (3) comprises a rear end cover (31) and a variable frequency drive controller (32); the rear end cover (31) is fixedly connected with the middle cover (24), and the variable frequency drive The controller (32) is housed between the rear end cover (31) and the middle cover (24).

[2] The dishwasher-dedicated motor according to claim 1, wherein the outer side of the middle cover (24) is provided with a plurality of asymmetric first outer lugs (240), and the rear end cover ( 31) is provided with a respective plurality of second external asymmetrical lug (310) and respectively connected to the opposing first plurality of external lug _(240), to the rear end cover (31) and the cover (24) fixed connection.

[3] The dishwasher-dedicated motor according to claim 1, wherein the internal three-phase winding of the stator (22) is provided with a lead wire (29), the lead wire (29) and a drive controller The PCB component (32) is connected; the variable frequency drive controller (3) further includes a power signal line component (33), and the power signal line component (33) includes a power line (331) and a signal line (332). One end of the power line (331) and the signal line (332) is connected to the drive controller PCB assembly (32), and the other end of the motor is externally connected to the power source and the signal source.

[4] The dishwasher-dedicated motor according to claim 3, wherein the motor body (2) is further provided with a PCB lead wire assembly (26), and the PCB lead wire assembly (26) is fixedly connected to The stator (22) includes a PCB board (261), a terminal mating plug (262), and the lead wire (29), one end of the lead wire (29) is soldered on the PCB board (261), and the other end is Connecting terminal butt plug (262);

The driving controller PCB assembly (32) includes a driving PCB board (320) and a terminal docking socket (322) disposed on the driving PCB board (320), and the driving PCB board (320) is provided with three Phase voltage to the power supply of the stator (22) and for switching the input power frequency to control the rotor

(23) a control unit of the rotational speed, one side of the terminal docking socket (322) is plugged into the terminal docking plug (262);

One end of the power line (331) of the power signal line assembly (33) is connected to the power unit On the other side of the terminal docking socket (322), the other end is provided with a power input interface (333) and an external power supply through the rear end cover (31), and one end of the signal line (332) corresponds to the control The portion is connected to the driving PCB board (320), and the other end is provided with a control signal line interface (334) and passes through an external signal source of the rear end cover (31).

[5] The dishwasher-dedicated motor according to claim 3 or 4, wherein the drive controller P

The CB assembly (32) is fixed to the rear end of the middle cover (24) and received in the rear end cover (31), and the outer side of the middle cover (24) is convexly provided with a first gate structure (246), the first The front end of the gate structure (246) is provided with a first half hole (2461), and the outer side of the rear end cover (31) is provided with a second door structure corresponding to the first door structure (246) of the middle cover (24). (316), the bottom end of the second gate structure (316) is provided with a second half hole (3161) with respect to the first half hole (2461) and is formed with a door hole (35), the power signal line assembly The power cable (331) and signal cable (332) of (33) pass through the rear door (31) through the door hole (35).

[6] The dishwasher-dedicated motor according to claim 3, wherein the magnetic material of the rotor (23) is made of four, six or eight pieces of neodymium iron boron magnetic tile structure; (22) 三相Use three-phase nine-slot steel sheet plastic structure, made of laminated silicon steel sheet (220), with a matching hole (221) for mounting the rotor (23) and surrounding the fit a hole (221) is provided with a magnet wire (222), and a side of the PCB board (261) of the PCB lead wire assembly (26) is correspondingly provided with a plurality of bosses (265), and the magnet wires (222) are connected to the plurality of holes On the boss (265), a stator boss (223) for protecting the electromagnetic wire (222) made of plastic is protruded from both ends of the stator (22), and a ground terminal is further disposed on the outer side of the stator (22). (225).

[7] A water pump assembly using the motor of claim 1, wherein the motor body (

The other end of the 2) is connected with a water pump (1). The water pump (1), the motor body (2) and the variable frequency drive unit ( ₃ ) form a three-stage connection structure, and the variable frequency drive unit ( ₃₎ passes through the motor body.

(2) Drive the water pump (1) Work and adjust the frequency of the motor body (2).

[8] The water pump assembly according to claim 7, wherein the motor body (2) further comprises a front end cover (21) fixedly coupled to the stator (22), the water pump (1) comprising a mount (13) and a water pump body (14) provided on the mounting seat (13); the front end cover (21) is provided with a plurality of hooks (210), and the mounting seat (13) is correspondingly provided with a plurality of card slots ( 130), the plurality of cards The corresponding hooks of the hooks (210) are placed in the plurality of card slots (130), the mounting seat (13) is snap-connected with the front end cover (21), and the water pump (1) is fixedly connected to the motor body (2).

The water pump assembly according to claim 7 or 8, wherein the rotor (23) is provided with a rotating shaft (230), and a front end of the rotating shaft (230) is provided with a connecting portion (231), and the water pump (1) The mounting seat (13) is correspondingly provided with a mounting portion (131), which is coupled to the mounting portion (131) through the front end cover (21); the rear end of the rotating shaft (230) A mating portion (232) is disposed, and a middle portion of the rear end cover (31) is correspondingly provided with a mounting passage (311), the mating portion (232) passes through the middle cover (24), and the drive controller PCB assembly (32) is inserted Connected to the mounting channel (311), the connection of the rotating shaft (230) to the mounting seat (13) is adjusted by the mounting channel (311) rotating the rotating shaft (230).

The water pump assembly according to claim 9, wherein the front end cover (21), the middle cover (24), and the rear end cover (31) are flame-retardant plastic parts or metal parts, and the end faces thereof are provided for reducing a heavy and heat-dissipating mesh structure, and a central portion of the front end cover (21) and the middle cover (24) is provided with a bearing chamber for mounting a bearing, the bearing chamber has a regular twelve-sided shape, and the end portion is provided with a perforation for The rotating shaft (230) passes through the front end cover (21) and the middle cover (24); the connecting portion (231) of the rotating shaft (230) is provided with a thread, and the mounting portion (131) of the mounting seat (13) corresponds to a threaded hole is provided, and a connecting portion (231) of the rotating shaft (23 0) is threadedly connected to the mounting portion (131) through a through hole of the front end cover (21); a through hole is formed in a middle portion of the driving PCB board (320) (321), a front end of the mounting channel (311) is corresponding to the through hole (321) of the driving PCB board (320), and is inserted into the through hole (321), and the engaging portion of the rotating shaft (230) 232) Pass through the perforation of the middle cover (24) and insert it into the mounting channel (311).