PCB axial magnetic flux direct current brushless motor

Abstract

The utility model discloses a PCB axial magnetic flux direct current brushless motor, which comprises a rotor shell, a rotor disc assembly, a stator shell, a PCB stator disc and a driving shaft piece, the middle part of the stator shell is provided with a supporting panel, the front side of the supporting panel is provided with a stator cavity, and the PCB stator disc is arranged in the stator cavity; a rotor cavity is formed in the rotor shell, the rotor disc assembly is installed in the rotor cavity, the rotor shell and the stator shell are connected in an embedded mode, the rotor disc assembly and the PCB stator disc are oppositely arranged in the same cavity, the driving shaft piece is fixedly connected to the center of the rotor disc assembly, and the front end of the driving shaft piece extends out of the rotor shell. The electrified PCB stator disc drives the rotor disc assembly to rotate, the rotor disc assembly drives the driving shaft piece to rotate, and the front end of the driving shaft piece transmits power outwards; the motor is driven by axial magnetic flux to rotate, the machine body is small in size and light in weight, the installation freedom degree is higher, and the layout which cannot be achieved by a traditional motor can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of engine motor, concretely relates to a PCB axial flux DC brushless motor. BACKGROUND

[0002] With the increasingly fierce competition in the automobile market, each host factory is committed to improving the thermal efficiency of the engine, and one of the very important technical routes is the electronic variable valve timing adjustment technology (EVVT: electric variable valve timing). The related products mainly have two parts of the brushless DC motor (BLDC: Brushless Direct Current) and the gearbox (Gearbox). At present, the EVVT brushless DC motor appearing on the market generally adopts a radial flux motor with a Hall position sensor, the motor rotor is internally assembled with a shaft, the end of the shaft is equipped with a driving unit, the motor controller is assembled on the side of the motor stator, and secondary injection molding is carried out, so that the volume and weight of the existing motor are relatively large, the cost is high, and the motor efficiency is relatively low. Moreover, the space in the existing engine timing cover is very compact, and the EVVT of this form is difficult to arrange in the engine compartment, so the existing brushless DC motor needs to be improved. SUMMARY

[0003] In view of the above problems and technical requirements, the purpose of the utility model is to develop a brushless DC motor part with more compact structure, lower cost and higher motor efficiency, by adopting the PCB axial flux DC brushless motor, without setting the Hall position sensor, cooperating with the FOC vector control method to accurately control the phase of the EVVT, overcoming the defects of large volume and high cost of the existing motor.

[0004] The utility model discloses a technical scheme as follows: a PCB axial flux DC brushless motor, including rotor casing, rotor disc subassembly, stator casing, PCB stator disc and drive shaft spare, the stator casing middle part is support panel, and the support panel front side is stator cavity, is installed with PCB stator disc in stator cavity;Rotor casing is equipped with rotor cavity, installs rotor disc subassembly in rotor cavity, and rotor casing and stator casing are embedded and are connected, and rotor disc subassembly and PCB stator disc are oppositely arranged in the same cavity, and the centre of drive shaft spare is fixedly connected in rotor disc subassembly, and drive shaft spare front end protrudes from rotor casing, and PCB stator disc drives rotor disc subassembly to rotate after electrifying, and rotor disc subassembly drives drive shaft spare to rotate, and drive shaft spare front end transmits power to the outside. In the above scheme, the traditional iron core winding stator is changed into PCB stator disc, makes the volume and weight of stator greatly reduce, makes PCB stator disc produce axial magnetic flux through electrifying to PCB stator disc, thereby drives the rotation of rotor, in addition to size and weight, the advantages of no iron core also include reducing stator hysteresis and eddy current loss, thereby improving efficiency or physical output per unit of electric quantity input, further improve the working efficiency and reliability of motor.

[0005] Further, the rotor disc subassembly includes a back iron plate and permanent magnets, the back iron plate is circular, a plurality of pairs of permanent magnets are arranged on the inner side of the back iron plate, and the plurality of pairs of permanent magnets are evenly arranged around the center of the back iron plate. The number of pairs of permanent magnets can be determined according to system functions and motor torque / power requirements. The permanent magnets are installed on the back iron plate. The back iron plate can improve the utilization rate of magnetic flux, thereby improving the efficiency of the motor, and together with the permanent magnets, forms a motor rotor.

[0006] Further, the PCB stator disc includes a base and copper wire windings, the base is an annular PCB printed circuit board, a plurality of copper wire windings are etched around the center of the base, the copper wire windings are equidistantly spaced, and the shape of the copper wire windings is trapezoidal or circular. Generally, the magnetic flux density of the trapezoidal structure is higher, so it is more recommended to arrange the copper wire windings in a trapezoidal winding manner.

[0007] Further, a PCB control board is installed in the cavity at the back side of the support panel, a control chip is arranged in the PCB control board, the control chip can control the current of the PCB stator disc, the PCB control board is fixedly connected to the support panel by a plurality of screws, a cavity cover is arranged on the outer side of the PCB control board, and the cavity cover encloses the PCB control board in the stator casing.

[0008] Further, a first bearing is fixedly arranged at the center of the rotor casing, a second bearing is arranged at the center of the stator casing, the drive shaft spare is fixedly connected to the center of the back iron plate, the drive shaft spare on both sides of the back iron plate is rotatably connected to the first bearing and the second bearing respectively, and the front end of the drive shaft spare protrudes out of the rotor casing through the first bearing.

[0009] Further, the first bearing and the second bearing are both ball bearings.

[0010] Further, the front end of the driving shaft is provided with a driving clamping piece, and the driving clamping piece and the driving shaft are connected in an interference fit.

[0011] Further, the rotor shell and the stator shell are both injection molded shells.

[0012] Further, the stator shell is provided with a current input port on the peripheral surface, and a current connection plug is injection molded in the current input port.

[0013] Further, the stator shell is provided with a plurality of connecting lugs on the peripheral surface.

[0014] The motor of the utility model has the advantages that the traditional iron core winding stator is replaced by a PCB stator disc, and copper wire winding is directly etched on the surface of the PCB stator disc, so that the weight and size of the motor are greatly reduced, the current flowing into the PCB stator disc is controlled through a PCB control board, a Hall position sensor is not needed, and the phase of EVVT can be accurately controlled in cooperation with the FOC vector control method. Under the guidance of the FOC vector control method, the PCB control board intermittently supplies power to different copper wire windings, so that the copper wire winding that is powered generates an axial magnetic field, the axial magnetic field can drive the rotor disc assembly and the driving shaft to rotate, and the purpose of transmission is achieved. In the axial flux motor, electromagnetic current is efficient, compared with the traditional radial flux motor, the improved motor has the advantages of stronger durability, and the compact motor body has higher installation freedom, can realize the layout that the traditional motor cannot realize, is not only mobile, but also greatly improves the internal space and carrying capacity of the vehicle. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is an exploded view structure of the utility model brushless motor;

[0016] Figure 2 It is an end face structure diagram of the utility model brushless motor;

[0017] Figure 3 It is Figure 2 It is a sectional view at A-A;

[0018] Figure 4 It is an installation structure diagram of the PCB stator disc of the utility model brushless motor;

[0019] Figure 5 It is an installation structure diagram of the PCB control board of the utility model brushless motor;

[0020] Figure 6 It is a rotor disc assembly structure diagram of the utility model brushless motor;

[0021] The figure is marked as: driving shaft 1, driving clamping piece 11, rotor shell 2, first bearing 21, rotor disc assembly 3, back iron plate 31, permanent magnet 32, stator shell 4, supporting panel 41, second bearing 42, current input port 43, connecting lug 44, PCB stator disc 5, base body 51, copper wire winding 52, PCB control panel 6, screw 61, cavity cover 62. DETAILED DESCRIPTION

[0022] The utility model will be further described below in combination with the drawings and examples.

[0023] As Figures 1-6 The utility model relates to a kind of PCB axial flux DC brushless motor, including rotor shell 2, rotor disc assembly 3, stator shell 4, PCB stator disc 5 and driving shaft 1, the middle part of stator shell 4 is supporting panel 41, the front side of supporting panel 41 is stator cavity, and PCB stator disc 5 is installed in stator cavity;Rotor shell 2 is equipped with rotor cavity, rotor disc assembly 3 is installed in rotor cavity, rotor shell 2 and stator shell 4 are embeddedly connected, and rotor disc assembly 3 and PCB stator disc 5 are oppositely arranged in the same cavity.

[0024] PCB stator disc 5 includes base body 51 and copper wire winding 52, base body 51 is annular PCB printed circuit board, and multiple copper wire windings 52 are etched around the center on base body 51, copper wire winding 52 is equidistantly spaced, and the shape of copper wire winding 52 is trapezoidal or circular.Usually, the magnetic flux density of trapezoidal structure is higher, so it is more recommended to arrange copper wire winding in the way of trapezoidal winding.The cavity in the rear side of supporting panel 51 is installed with PCB control panel 6, and control chip is equipped in PCB control panel 6, and the current of PCB stator disc 5 can be controlled by control chip, and PCB control panel 6 is fixedly connected on supporting panel 41 by multiple screws 61, and cavity cover 62 is arranged on the outside of PCB control panel 6, and cavity cover 62 encloses PCB control panel 6 in stator shell 4.

[0025] Rotor disc assembly 3 includes back iron plate 31 and permanent magnet 32, back iron plate 31 is circular, and multiple pairs of permanent magnets 32 are arranged on the inner side of back iron plate 31, and the multiple pairs of permanent magnets 32 are evenly arranged around the center of back iron plate 31.The number of permanent magnets 32 can be determined according to system function and motor torque / power demand, and permanent magnet 32 is installed on back iron plate 31, and back iron plate 31 can improve the utilization rate of magnetic flux, thereby improving the efficiency of motor, and together with permanent magnet 32, it constitutes motor rotor.Rotor shell 2 is fixedly provided with first bearing 21 at the center, stator shell 4 is provided with second bearing 42 at the center, driving shaft 1 is fixedly connected with the center of back iron plate 31, and driving shaft 1 on both sides of back iron plate 31 is rotatably connected with first bearing 21 and second bearing 42 respectively, and the front end of driving shaft 1 extends out of rotor shell 2 through first bearing 21.Both first bearing 21 and second bearing 42 are ball bearings.

[0026] The driving shaft 1 is fixedly connected at the center of the rotor disc assembly 3, and the front end of the driving shaft 1 extends out of the rotor shell 2; the PCB stator disc 5 after being electrified drives the rotor disc assembly 3 to rotate, the rotor disc assembly 3 drives the driving shaft 1 to rotate, and the front end of the driving shaft 1 transmits power outward.

[0027] The rotor shell 2 and the stator shell 4 are both injection molded shells; the peripheral surface of the stator shell 4 is provided with a current input port 43, and the current input port 43 is injection molded with an electrified connector; and the peripheral surface of the stator shell is also provided with a plurality of connecting lugs 44.

[0028] The working principle of the utility model is as follows: FOC vector control method is adopted, the amplitude and frequency of the output voltage of the frequency converter are controlled through the PCB control board, the PCB control board successively electrifies different copper wire windings on the PCB stator disc, the copper wire winding 52 after being electrified generates an axial magnetic field, attracts the permanent magnet 32 on the back iron plate 31 to be close, the back iron plate 32 rotates, when the back iron plate 32 makes the permanent magnet 32 rotate through the copper wire winding 52 under the action of inertia, immediately switches the current to the next copper wire winding 52, continuously attracts the permanent magnet 32 to rotate in the same method, realizes the rotation of the back iron plate 31, the back iron plate drives the driving shaft 1 at the center to rotate, and the driving shaft 1 transmits power outward through the driving clamping piece 11 at the front end.

[0029] The above is only a few preferred embodiments of the utility model, but the protection scope of the utility model is not limited to this, any person skilled in the art can easily think of changes and replacements within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model. Therefore, the protection scope of the utility model should be the protection scope of the claims.

Claims

1. A PCB axial flux DC brushless motor characterized by: The application relates to a motor, which comprises a rotor shell, a rotor disc assembly, a stator shell, a PCB stator disc and a driving shaft piece, the middle part of the stator shell is a supporting panel, the front side of the supporting panel is a stator cavity, the PCB stator disc is arranged in the stator cavity, a rotor cavity is arranged in the rotor shell, the rotor disc assembly is arranged in the rotor cavity, the rotor shell and the stator shell are embeddedly connected, the rotor disc assembly and the PCB stator disc are oppositely arranged in the same cavity, the driving shaft piece is fixedly connected to the center of the rotor disc assembly, the front end of the driving shaft piece extends out of the rotor shell, the PCB stator disc drives the rotor disc assembly to rotate after being electrified, the rotor disc assembly drives the driving shaft piece to rotate, and the front end of the driving shaft piece transmits power outward.

2. The PCB axial flux DC brushless motor of claim 1, wherein: The rotor disc assembly comprises a back iron plate and permanent magnets, the back iron plate is circular, a plurality of pairs of permanent magnets are arranged on the inner side of the back iron plate, and the plurality of pairs of permanent magnets are evenly arranged around the center of the back iron plate.

3. The PCB axial flux DC brushless motor of claim 2, wherein: The PCB stator disc comprises a base and copper wire windings, the base is an annular PCB (printed circuit board), a plurality of copper wire windings are etched around the center of the base, the copper wire windings are equidistantly arranged, and the shape of the copper wire winding is trapezoidal or circular.

4. The PCB axial flux DC brushless motor of claim 3, wherein: A PCB control board is arranged in the cavity on the rear side of the supporting panel, a control chip is arranged in the PCB control board, the control chip can control the current of the PCB stator disc, the PCB control board is fixedly connected to the supporting panel through a plurality of screws, a cavity cover is arranged on the outer side of the PCB control board, and the cavity cover encloses the PCB control board in the stator shell.

5. A PCB axial flux DC brushless motor as claimed in claim 4, characterized in that: A first bearing is fixedly arranged in the center of the rotor shell, a second bearing is arranged in the center of the stator shell, the driving shaft piece is fixedly connected to the center of the back iron plate, the driving shaft pieces on the two sides of the back iron plate are rotatably connected to the first bearing and the second bearing respectively, and the front end of the driving shaft piece extends out of the rotor shell through the first bearing.

6. A PCB axial flux DC brushless motor as claimed in claim 5, characterized in that: The first bearing and the second bearing are both ball bearings.

7. A PCB axial flux DC brushless motor as claimed in claim 6, characterized in that: A driving clamping piece is arranged on the front end of the driving shaft piece, and the driving clamping piece is connected to the driving shaft piece in an interference fit.

8. The PCB axial flux DC brushless motor of claim 7, wherein: The rotor shell and the stator shell are both injection molded shells.

9. The PCB axial flux DC brushless motor of claim 8, wherein: A current input port is arranged on the circumferential surface of the stator shell, and a current connector is injection molded in the current input port.

10. The PCB axial flux BLDC motor of claim 9, wherein: A plurality of connecting ears are arranged on the circumferential surface of the stator shell.

Images