A control circuit assembly and stator pre-positioning structure motor and debugging method

Abstract

The present invention relates to the technical field of brushless DC motors, and in particular to a control circuit assembly and a stator pre-positioning structure motor and a debugging method. A control circuit assembly and a stator pre-positioning structure motor comprises a housing, a first end cover, a first bearing, a rotor, a stator, a second end cover, a second bearing, a control circuit assembly and a sensor rotor assembly, wherein the housing and the stator are fixedly connected by heating interference fit, a rotor is arranged at the center of the stator, a winding is wound on the stator, a first bearing and a second bearing are respectively installed at both ends of the rotor, the first end cover and the second end cover are respectively matched with the rotor by the first bearing and the second bearing, the housing and the first end cover and the second end cover are fixed by laser welding, the control circuit assembly is installed in a circular groove on the second end cover by a plurality of screws, the control circuit assembly comprises a circuit board and a Hall element welded on the circuit board, and has the advantage of assembling the control circuit assembly near the optimal position for commutation.

Description

Technical Field

[0001] The invention relates to the technical field of brushless direct current motors, and in particular to a motor with a control circuit component and a stator pre-positioning structure and a debugging method. Background Art

[0002] Brushless DC motors need to detect the rotor rotation angle through Hall elements, and the motor driver converts the rotor rotation position signal into the drive commutation signal of the stator winding. The installation position of the Hall element will affect the rotor position signal, causing the stator winding commutation to be advanced or delayed, and ultimately affecting the motor current, speed and other performance parameters. The installation position of the Hall element is uncertain during the motor production process. In order to achieve optimal performance, the motor usually needs to repeatedly adjust the position of the Hall element, which is complex and has low production efficiency. Summary of the invention

[0003] To solve the above problems, the present invention provides a control circuit component pre-positioning structure motor and debugging method, which has the advantages of assembling the control circuit component near the optimal commutation position and reducing the amplitude, number and difficulty of adjusting the position of the control circuit component.

[0004] To achieve the above object, the technical solution adopted by the present invention is:

[0005] A motor with a control circuit assembly and a stator pre-positioning structure comprises a housing, a first end cover, a first bearing, a rotor, a stator, a second end cover, a second bearing, a control circuit assembly and a sensor rotor assembly. The housing and the stator are fixedly connected by heating interference fit. A rotor is arranged at the center of the stator, a winding is wound on the stator, a first bearing and a second bearing are respectively mounted at both ends of the rotor, the first end cover and the second end cover are respectively matched with the rotor through the first bearing and the second bearing, the housing and the first end cover and the second end cover are fixed by laser welding, the control circuit assembly is mounted in a circular groove on the second end cover by a plurality of screws, the control circuit assembly comprises a circuit board and a Hall element welded on the circuit board, and the sensor rotor assembly is fixed to one end of the rotor close to the second bearing.

[0006] Preferably, the sensor rotor assembly comprises a magnetic ring, a pair of magnetic ring gaskets arranged at both ends of the magnetic ring, and a nut, wherein the nut fixes the magnetic ring and the magnetic ring gasket to the tail of the rotor.

[0007] Preferably, the sensor rotor assembly comprises a magnetic ring, a key and an elastic shaft retaining ring; the magnetic ring cooperates with the rotor via the key, and its axial position is fixed by the elastic shaft retaining ring.

[0008] Preferably, the stator has a semicircular positioning groove, the end of the shell has a semicircular first positioning hole, and the opening of the positioning groove is opposite to the opening of the first positioning hole.

[0009] Preferably, a semicircular second positioning hole is provided on the outer circumferential surface of the second end cover interface, a semicircular third positioning hole is provided on the outer circumferential surface of the docking end of the shell and the second end cover, and the opening of the second positioning hole is opposite to the opening of the third positioning hole.

[0010] Preferably, a semicircular fourth positioning hole is provided at the edge of the circuit board, a semicircular fifth positioning hole is provided at the edge of the circular groove of the second end cover, and an opening of the fourth positioning hole is opposite to an opening of the fifth positioning hole.

[0011] Preferably, the control circuit assembly and the stator pre-positioning structure motor further comprises a sensor back cover, the sensor back cover is mounted on the second end cover, and a wire protection sleeve is fixed on the sensor back cover.

[0012] Preferably, a circuit board gasket made of non-metallic material is provided between the control circuit assembly and the second end cover.

[0013] Preferably, the number of the screws is 2.

[0014] The present invention also provides a debugging method for the above-mentioned control circuit assembly and stator pre-positioning structure motor, comprising the following debugging steps:

[0015] Step 1: Install the control circuit assembly in the circular groove of the second end cover by screws. Do not tighten the screws at this time to ensure that the control circuit assembly can rotate freely;

[0016] Step 2: Connect the lead wires of the stator winding and the lead wires of the control circuit assembly to the motor controller respectively;

[0017] Step 3: Provide rated voltage to the control circuit assembly and the stator pre-positioning structure motor through the motor controller to drive it to rotate clockwise, and record the motor speed and current;

[0018] Step 4: Keep the control circuit assembly and the stator pre-positioning structure motor rotating, adjust the position of the control circuit assembly, observe and record the minimum current value and speed value, and temporarily fix the control circuit assembly;

[0019] Step 5: Provide rated voltage to the control circuit assembly and the stator pre-positioning structure motor through the motor controller, drive the motor to rotate counterclockwise, and record the motor speed and current;

[0020] Step 6: Compare the clockwise and counterclockwise speed values ​​and current values ​​of the control circuit assembly and the stator pre-positioning structure motor. If the speed and current differ greatly, it is necessary to continue to adjust the position of the control circuit assembly until the currents in both directions of the motor are substantially equal and the speeds are close. At this time, the position of the control circuit assembly is the optimal position.

[0021] Step 7: Tighten the screws to fix the position of the control circuit assembly and complete the debugging.

[0022] The beneficial effects of using the present invention are as follows: by setting a plurality of positioning holes, the stator and the housing, the second end cover and the control circuit component are pre-positioned, so that the control circuit component is installed near the optimal position for commutation; the motor can achieve optimal performance through adjustment, the difficulty and time of adjusting the Hall element are reduced, and the production efficiency is improved; the debugging method proposes clear debugging qualification criteria, and the direction and specific method of debugging can be clearly pointed out during the production process, reducing the uncertainty in the debugging process; the debugging method is simple and feasible, reducing the difficulty, number and time of adjusting the Hall element, improving the production efficiency, and meeting the position requirements of the motor Hall element. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present invention;

[0024] Figure 2 It is a schematic diagram of assembling the control circuit assembly, the second end cover, and the sensor rotor assembly in the first embodiment of the present invention;

[0025] Figure 3 It is a schematic diagram of the assembly of the housing and the second end cover of the present invention;

[0026] Figure 4 It is a structural schematic diagram of the stator of the present invention;

[0027] Figure 5 For the present invention Figure 1 Enlarged view of part A in the middle;

[0028] Figure 6 It is a schematic diagram of the structure of the sensor rotor assembly in the second embodiment of the present invention.

[0029] Figure 7 It is a schematic diagram of the assembly of the control circuit assembly, the second end cover, and the sensor rotor assembly in the second embodiment of the present invention;

[0030] Reference numerals include:

[0031] 1-first end cover; 2-first bearing; 3-rotor; 4-stator; 41-positioning groove; 5-housing; 51-third positioning hole; 6-second bearing; 7-second end cover; 71-second positioning hole; 72-fifth positioning hole; 8-control circuit assembly; 81-circuit board; 811-fourth positioning hole; 82-Hall element; 9-sensor rotor assembly; 91-magnetic ring; 92-magnetic ring gasket; 93-nut; 10-screw; 11-key; 12-elastic clamp ring for shaft; 13-sensor back cover; 14-wire sheath. DETAILED DESCRIPTION

[0032] The present invention is described in detail below with reference to the accompanying drawings.

[0033] Embodiment 1

[0034] like Figure 1-5 As shown, a motor with a control circuit assembly 8 and a stator 4 pre-positioning structure includes a housing 5, a first end cover 1, a first bearing 2, a rotor 3, a stator 4, a second end cover 7, a second bearing 6, a control circuit assembly 8 and a sensor rotor assembly 9. The housing 5 and the stator 4 are fixedly connected by heating interference fit. The rotor 3 is arranged at the center of the stator 4, and a winding is wound on the stator 4. The first bearing 2 and the second bearing 6 are respectively installed at both ends of the rotor 3. The first end cover 1 and the second end cover 7 are matched with the rotor 3 through the first bearing 2 and the second bearing 6 respectively. The housing 5 is fixed to the first end cover 1 and the second end cover 7 by laser welding. The control circuit assembly 8 is installed in a circular groove on the second end cover 7 by a plurality of screws 10. The control circuit assembly 8 includes a circuit board 81 and a Hall element 82 welded on the circuit board 81. The sensor rotor assembly 9 is fixed to one end of the rotor 3 close to the second bearing 2.

[0035] The sensor rotor assembly 9 includes a magnetic ring 91, a key 11 and an elastic collar 12 for the shaft. The magnetic ring 91 cooperates with the rotor 3 through the key 11, and its axial position is fixed by the elastic collar 12 for the shaft. This arrangement facilitates the installation of the sensor rotor assembly 9. The sensor rotor assembly 93 cooperates with the shaft to ensure coaxiality. The flat key 11 prevents the sensor rotor assembly 9 from rotating relative to the shaft. The elastic collar 12 for the shaft fixes the sensor rotor assembly 9 axially to reduce the axial length.

[0036] The stator 4 has a semicircular positioning groove 41, and the end of the housing 5 has a semicircular first positioning hole, and the opening of the positioning groove 41 is opposite to the opening of the first positioning hole. When the stator 4 and the housing 5 are assembled, the angular positioning of the stator 4 and the housing 5 in the circumferential direction is ensured by aligning the positioning groove 41 with the first positioning hole.

[0037] A semicircular second positioning hole 71 is provided on the outer circumferential surface of the interface of the second end cover 7, and a semicircular third positioning hole 51 is provided on the outer circumferential surface of the butt end of the housing 5 and the second end cover 7, and the opening of the second positioning hole 71 is opposite to the opening of the third positioning hole 51. The angular positioning of the housing 5 and the rear end cover in the circumferential direction is achieved by aligning the second positioning hole 71 with the third positioning hole 51.

[0038] A semicircular fourth positioning hole 811 is provided at the edge of the circuit board 81, and a semicircular fifth positioning hole 72 is provided at the edge of the circular groove of the second end cover 7, and the opening of the fourth positioning hole 811 is opposite to the opening of the fifth positioning hole 72. The angle positioning of the circuit board 81 assembly and the rear end cover in the circumferential direction is achieved by aligning the fourth positioning hole 811 with the fifth positioning hole 72.

[0039] The control circuit assembly and the stator pre-positioning structure motor also includes a sensor back cover 13, which is mounted on the second end cover 7. A wire protection sleeve 14 is fixed on the sensor back cover 13, and the wire protection sleeve 14 is installed in the hole of the sensor back cover 13 to protect the lead wires of the motor.

[0040] A circuit board gasket made of non-metallic material is also provided between the control circuit assembly 8 and the second end cover 7, and the circuit board gasket is used to ensure the insulation performance of the circuit board.

[0041] There are two screws 10 , which are distributed on both sides of the circuit board 81 . By tightening the screws 10 , the screw heads squeeze the circuit board 81 , so that the circuit board 81 is fixed in the circular groove on the second end cover 7 .

[0042] Embodiment 2

[0043] like Figure 3-7 As shown, the control circuit assembly and the stator pre-positioning structure motor in this embodiment are basically the same as those in the first embodiment, and will not be described in detail here. The difference is that the sensor rotor assembly 9 includes a magnetic ring 91, a pair of magnetic ring gaskets 92 and nuts 93 arranged at both ends of the magnetic ring 91, and the nuts 93 fix the magnetic ring 91 and the magnetic ring gasket 92 to the tail of the rotor 3. This structure is easy to install the magnetic ring 91. The magnetic ring gaskets 92 are placed at both ends of the magnetic ring 91 to prevent the nuts 93 from tightening and squeezing the magnetic ring 91 and cracking it.

[0044] like Figure 1-7 As shown, the debugging method of the motor using the control circuit assembly and the stator pre-positioning structure shown in the present invention includes the following debugging steps:

[0045] Step 1: Install the control circuit assembly 8 in the circular groove of the second end cover 7 by means of screws 10. At this time, do not tighten the screws 10 to ensure that the control circuit assembly 8 can rotate freely.

[0046] Step 2: Connect the lead wires of the stator 4 winding and the lead wires of the control circuit assembly 8 to the motor controller respectively;

[0047] Step 3: Provide rated voltage to the control circuit assembly and the stator pre-positioning structure motor through the motor controller, drive it to rotate clockwise, and record the motor speed and current;

[0048] Step 4: Keep the control circuit assembly and the stator pre-positioning structure motor rotating, adjust the position of the control circuit assembly 8, observe and record the minimum current value and speed value, and temporarily fix the control circuit assembly 8:

[0049] Step 5: Provide rated voltage to the control circuit assembly and the stator pre-positioning structure motor through the motor controller, drive the motor to rotate counterclockwise, and record the motor speed and current;

[0050] Step 6: Compare the clockwise and counterclockwise speed and current values ​​of the control circuit assembly and the stator pre-positioning structure motor. If the speed and current differ greatly, it is necessary to continue to adjust the position of the control circuit assembly 8 until the currents in both directions of the motor are basically equal and the speeds are close. At this time, the position of the control circuit assembly 8 is the optimal position;

[0051] Step 7: Tighten the screws 10 to fix the position of the control circuit assembly 8 and complete the debugging.

[0052] Install the control circuit assembly 8 in the second end cover 7 of the motor, drive the motor to rotate clockwise, and adjust the position of the control circuit assembly 8 until the motor current is minimum; drive the motor to rotate counterclockwise, compare the speed and current, and further adjust the position of the control circuit assembly 8 so that the current in both directions of the motor is basically equal and the speed is close. This debugging method has been verified by product production, and the debugging method is simple and feasible, and can meet the position requirements of the motor Hall element 82. This structure is easy to install and debug the control circuit assembly 8, and the control circuit assembly 8 cooperates with the second end cover 7 of the motor, and the coaxiality is good.

[0053] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, many changes can be made in the specific implementation methods and application scopes based on the ideas of the present invention. As long as these changes do not deviate from the concept of the present invention, they all belong to the protection scope of the present invention.

Claims

1. A method for debugging a motor having a control circuit assembly and a stator pre-positioning structure, wherein the motor having the control circuit assembly and the stator pre-positioning structure comprises a housing (5), a first end cover (1), a first bearing (2), a rotor (3), a stator (4), a second end cover (7), a second bearing (6), a control circuit assembly (8) and a sensor rotor assembly (9), wherein the housing (5) and the stator (4) are fixedly connected by heating interference fit, a rotor (3) is arranged at the center of the stator (4), a winding is wound on the stator (4), and a first bearing (2) and a second bearing ( 6), the first end cover (1) and the second end cover (7) are respectively matched with the rotor (3) through the first bearing (2) and the second bearing (6), the housing (5) and the first end cover (1) and the second end cover (7) are fixed by laser welding, the control circuit assembly (8) is installed in the circular groove on the second end cover (7) by a plurality of screws (10), the control circuit assembly (8) includes a circuit board (81) and a Hall element (82) welded on the circuit board (81), and the sensor rotor assembly (9) is fixed to one end of the rotor (3) close to the second bearing (6); The sensor rotor assembly (9) comprises a magnetic ring (91), a key (11) and a shaft elastic clamp (12); the magnetic ring (91) cooperates with the rotor (3) via the key (11), and the shaft elastic clamp (12) is used to fix its axial position; The stator (4) has a semicircular positioning groove (41), the end of the housing (5) has a semicircular first positioning hole, and the opening of the positioning groove (41) is opposite to the opening of the first positioning hole; A semicircular second positioning hole (71) is provided on the outer circumferential surface of the interface of the second end cover (7), and a semicircular third positioning hole (51) is provided on the outer circumferential surface of the butt end of the shell (5) and the second end cover (7), and the opening of the second positioning hole (71) is opposite to the opening of the third positioning hole (51); A semicircular fourth positioning hole (811) is provided at the edge of the circuit board (81), a semicircular fifth positioning hole (72) is provided at the edge of the circular groove of the second end cover (7), and the opening of the fourth positioning hole (811) is opposite to the opening of the fifth positioning hole (72); Its characteristics are: The debugging method includes the following debugging steps: Step 1: Install the control circuit assembly (8) inside the circular groove of the second end cover (7) by means of screws (10). At this time, do not tighten the screws (10) to ensure that the control circuit assembly (8) can rotate freely; Step 2: Connect the lead wires of the stator (4) winding and the lead wires of the control circuit assembly (8) to the motor controller respectively; Step 3: Provide rated voltage to the control circuit assembly and the stator pre-positioning structure motor through the motor controller to drive it to rotate clockwise, and record the motor speed and current; Step 4: Keep the control circuit assembly and the stator pre-positioning structure motor rotating, adjust the position of the control circuit assembly (8), observe and record the minimum current value and speed value, and temporarily fix the control circuit assembly (8); Step 5: Provide rated voltage to the control circuit assembly and the stator pre-positioning structure motor through the motor controller, drive the motor to rotate counterclockwise, and record the motor speed and current; Step 6: Compare the clockwise and counterclockwise rotational speeds and currents of the control circuit assembly and the stator pre-positioning structure motor. If the speed and current differ greatly, it is necessary to continue adjusting the position of the control circuit assembly (8) until the currents in both directions of the motor are substantially equal and the speeds are close. At this time, the position of the control circuit assembly (8) is the optimal position. Step 7: Tighten the screws (10) to fix the position of the control circuit assembly (8) and complete the debugging.

2. The method for debugging a motor with a control circuit assembly and a stator pre-positioning structure according to claim 1, characterized in that: The control circuit assembly and stator pre-positioning structure motor further comprises a sensor back cover (13), the sensor back cover (13) is mounted on the second end cover (7), and a wire protection sleeve (14) is fixed on the sensor back cover (13).

3. The debugging method of a motor with a control circuit assembly and a stator pre-positioning structure according to claim 1, characterized in that: A circuit board (81) gasket made of non-metallic material is also provided between the control circuit assembly (8) and the second end cover (7).

4. The method for debugging a motor with a control circuit assembly and a stator pre-positioning structure according to claim 1, characterized in that: The number of the screws (10) is 2.

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