Brushless motor and Hall sensing assembly

Abstract

The utility model discloses a brushless motor and a Hall sensing assembly, and relates to the technical field of motors. The Hall sensing assembly comprises a support, a Hall element and a magnetic conductive sheet. The Hall element is inserted into the bracket; one end of the magnetic conductive sheet is inserted into the support and clings to the Hall element, and the other end of the magnetic conductive sheet is used for extending into a magnetic field of the rotor. According to the Hall sensing assembly, the Hall element and the magnetic conductive sheet are fixedly installed through the support, the Hall element and the magnetic conductive sheet are accurately and reliably positioned, one end of the magnetic conductive sheet can extend into a magnetic field of the rotor, and therefore long-distance sensing of the Hall element and the rotor is achieved; the installation position of the Hall element is not limited by the installation position of the magnetic rotor and the magnetic induction range, the magnetic field induction effect of the Hall element is more stable, and clutters are less.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a Hall sensor assembly, and also to a brushless motor, including the Hall sensor assembly. Background Art

[0002] The brushless motor consists of components such as rotor, stator, PCBA, and Hall plate.

[0003] In brushless motors, the Hall plate needs to achieve Hall sensing with the rotor. However, the installation positions of the rotor and the Hall plate in different types of brushless motors are limited. If the rotor and the Hall plate cannot be installed close to each other to ensure the Hall sensing effect, a Hall sensing rotor needs to be set up separately for the rotor to achieve long-distance sensing, which will inevitably increase the structural complexity of the brushless motor.

[0004] In summary, how to ensure the Hall sensing effect of the Hall plate and the rotor has become an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] The purpose of the present application is to provide a Hall sensor assembly having a Hall element, which can adapt to the installation position of the Hall element and the rotor in the motor regardless of the distance between the Hall element and the rotor, thereby ensuring the Hall sensing effect of the two. Another purpose of the present application is to provide a brushless motor, including the aforementioned Hall sensor assembly.

[0006] To achieve the above-mentioned purpose, the present application provides a Hall sensor assembly, including a bracket, a Hall element and a magnetic conductive sheet; the Hall element is inserted into the bracket; one end of the magnetic conductive sheet is inserted into the bracket and is close to the Hall element, and the other end of the magnetic conductive sheet is used to extend into the magnetic field of the rotor.

[0007] In some embodiments, the bracket is provided with an elastic pressing block for pressing the Hall element toward the magnetic conductive sheet.

[0008] In some embodiments, the Hall element includes a circuit board and pins; the bracket is provided with a first mounting groove for the circuit board to be inserted and positioned, a second mounting groove for the pins to be inserted and positioned, and a third mounting groove for the magnetic conductive sheet to be inserted and positioned; the elastic pressure block adheres to and squeezes the circuit board, and the third mounting groove is provided with a positioning rib protruding toward the circuit board.

[0009] In some embodiments, the elastic pressing block includes a root and a head, the root is connected to the bracket, and the head extends outward from the bracket; the head is provided with an extrusion arc surface protruding toward the circuit board.

[0010] In some embodiments, the positioning rib is semi-cylindrical; more than two positioning ribs are provided in the third installation groove, and all the positioning ribs are distributed in the same direction.

[0011] In some embodiments, the Hall element includes multiple pins, and the bracket is provided with multiple pin positioning grooves for all the pins to be inserted and positioned one by one; all the pin positioning grooves are distributed side by side along the first direction, and some of the pin positioning grooves are staggered with the remaining pin positioning grooves along the second direction; the first direction, the second direction and the insertion direction of any pin are perpendicular to each other.

[0012] In some embodiments, the Hall element includes three pins; the bracket is provided with two elastic pressing blocks; and the two elastic pressing blocks are spaced between the three pins.

[0013] The present application also provides a brushless motor, comprising a motor housing, a stator, a rotor and the above-mentioned Hall sensor assembly; the motor housing is provided with:

[0014] A first mounting cavity capable of accommodating a rotor;

[0015] A second mounting cavity capable of accommodating the bracket;

[0016] The third mounting cavity is arranged between the first mounting cavity and the second mounting cavity; the third mounting cavity extends in a zigzag manner, the magnetic conductive sheet is arranged in the third mounting cavity, and the magnetic conductive sheet has a bending portion matching the third mounting cavity.

[0017] In some embodiments, the motor housing is provided with a control panel; the control panel and the bracket are fixedly connected or integrally formed.

[0018] Compared with the above background technology, the Hall sensor assembly provided in the present application includes a bracket, a Hall element and a magnetic conductive sheet; the aforementioned Hall element is inserted into the bracket; one end of the aforementioned magnetic conductive sheet is inserted into the bracket and close to the Hall element, and the other end is used to extend into the magnetic field of the rotor.

[0019] The Hall sensor assembly provided in the present application uses a bracket to fix the Hall element and the magnetic conductive sheet, so that the Hall element and the magnetic conductive sheet are accurately positioned and reliably connected. Since one end of the magnetic conductive sheet is closely attached to the Hall element through the bracket and the other end extends into the magnetic field of the rotor, the long-distance sensing of the Hall element and the rotor can be satisfied, so that the installation position of the Hall element is not limited by the installation position and magnetic induction range of the magnetic rotor, and the magnetic field sensing effect of the Hall element can be made more stable and less cluttered, which is conducive to improving the performance of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0021] Figure 1A schematic diagram of the structure of a brushless motor provided in an embodiment of the present application;

[0022] Figure 2 A schematic diagram of the structure of the Hall sensor assembly provided in an embodiment of the present application;

[0023] Figure 3 A schematic diagram of the structure of the bracket provided in an embodiment of the present application in a first direction;

[0024] Figure 4 A schematic diagram of the structure of the bracket provided in an embodiment of the present application in the second direction.

[0025] Among them, 1- bracket, 11- pin positioning groove, 2- Hall element, 21- circuit board, 22- pin, 3- magnetic conductive sheet, 4- elastic pressure block, 41- root, 42- head, 5- positioning convex rib, 6- rotor, 7- stator. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] Please refer to Figures 1 to 4 , Figure 1 A schematic diagram of the structure of a brushless motor provided in an embodiment of the present application; Figure 2 A schematic diagram of the structure of the Hall sensor assembly provided in an embodiment of the present application;

[0029] Figure 3 A schematic diagram of the structure of the bracket provided in an embodiment of the present application in a first direction; Figure 4 A schematic diagram of the structure of the bracket provided in an embodiment of the present application in the second direction.

[0030] Please refer to Figure 1 and Figure 2 The present application provides a Hall sensor assembly, including a bracket 1, a Hall element 2 and a magnetic conductive sheet 3; in this embodiment, the Hall element 2 and the magnetic conductive sheet 3 are both inserted into the bracket 1, wherein one end of the magnetic conductive sheet 3 is inserted into the bracket 1 and is close to the Hall element 2, and the other end of the magnetic conductive sheet 3 is used to extend into the magnetic field of the rotor 6.

[0031] In this embodiment, the Hall element 2 and the magnetic conductive sheet 3 are both positioned and installed on the bracket 1, and the two are accurately positioned and reliably connected through the bracket 1; the magnetic conductive sheet 3 is located between the bracket 1 and the magnetic field of the rotor 6, and can transmit magnetic signals between the rotor 6 and the Hall element 2 to meet the Hall sensing requirements at different distances between the rotor 6 and the Hall element 2. Of course, for different types of motors, different magnetic conductive sheets 3 need to be set according to the relative positions of the rotor 6 and the Hall element 2.

[0032] In summary, the Hall sensor assembly provided in the present application uses a bracket 1 to fix the Hall element 2 and the magnetic conductive sheet 3, so that the Hall element 2 and the magnetic conductive sheet 3 can be accurately positioned and reliably connected in the motor. Among them, one end of the magnetic conductive sheet 3 is closely attached to the Hall element 2 through the bracket 1 and the other end extends into the magnetic field of the rotor 6. Therefore, no matter how the relative positions of the Hall element 2 and the rotor 6 are in the motor, the Hall sensing requirements of the Hall element 2 and the rotor 6 can always be met, including but not limited to the long-distance sensing of the Hall element 2 and the rotor 6. It can be seen that the Hall sensor assembly provided in the present application can make the installation position of the Hall element 2 not limited by the installation position and magnetic induction range of the magnetic rotor 6, and can make the magnetic field sensing effect of the Hall element 2 more stable and less cluttered.

[0033] The Hall sensor assembly provided in the present application is further described below in conjunction with the accompanying drawings and implementation examples.

[0034] Please refer to Figure 2 and Figure 3 In some embodiments, the bracket 1 is provided with an elastic pressing block 4; the elastic pressing block 4 and the magnetic conductive sheet 3 are respectively arranged on both sides of the Hall element 2, the magnetic conductive sheet 3 is close to the Hall element 2, and the elastic pressing block 4 can press the Hall element 2 toward the magnetic conductive sheet 3 to improve the connection strength between the Hall element 2 and the magnetic conductive sheet 3.

[0035] On the basis of the above embodiment, the Hall element 2 may include a circuit board 21 and a pin 22 connected to the circuit board 21; a first mounting groove, a second mounting groove and a third mounting groove are provided in the bracket 1, the first mounting groove can be used for the circuit board 21 to be inserted and positioned, the second mounting groove can be used for the pin 22 to be inserted and positioned, and the third mounting groove can be used for the magnetic conductive sheet 3 to be inserted and positioned; in this embodiment, a positioning rib 5 protruding toward the circuit board 21 is provided in the third mounting groove.

[0036] It can be seen that the above embodiment arranges the magnetic conductive sheet 3 and the elastic pressure block 4 on two opposite sides of the Hall element 2, respectively, and uses the elastic pressure block 4 to squeeze the Hall element 2 toward the magnetic conductive sheet 3. The above embodiment also arranges a positioning rib 5 in the third mounting groove, and uses the positioning rib 5 to push the magnetic conductive sheet 3 toward the Hall element 2, thereby improving the assembly strength of the circuit board 21 and the Hall element 2 and ensuring the performance of the Hall sensor component in the product.

[0037] Please refer to Figure 2 and Figure 3 In the above embodiment, the elastic pressing block 4 may include a root 41 and a head 42; the root 41 of the elastic pressing block 4 is connected to the bracket 1, and the head 42 of the elastic pressing block 4 extends outward from the bracket 1. In this embodiment, the head 42 of the elastic pressing block 4 is provided with an extrusion arc surface, which protrudes toward the circuit board 21, so that the circuit board 21 can be attached and extruded, and the circuit board 21 can be prevented from being worn.

[0038] In the above embodiment, the positioning rib 5 may be semi-cylindrical. Usually, more than two positioning ribs 5 may be provided in the third mounting groove, and all positioning ribs 5 are distributed in the same direction. For example, two positioning ribs 5 are provided in the third mounting groove, and the two positioning ribs 5 are parallel to each other. The two positioning ribs 5 are respectively located at the two side edges of the third mounting groove, and can respectively squeeze the two side edges of the magnetic conductive sheet 3 in the third mounting groove.

[0039] In some embodiments, the Hall element 2 includes a plurality of pins 22, and at the same time, the bracket 1 is provided with a plurality of pin positioning grooves 11, and all the pins 22 are inserted and positioned in all the pin positioning grooves 11 one by one. Generally, all the pin positioning grooves 11 are arranged side by side along the first direction, and some of the pin positioning grooves 11 are staggered with the remaining pin positioning grooves 11 along the second direction; wherein, the first direction, the second direction and the insertion direction of any one of the pins 22 are perpendicular to each other.

[0040] For reference Figure 2 and Figure 4 The Hall element 2 includes three pins 22, which are inserted and positioned in the three pin positioning grooves 11 of the bracket 1 in a one-to-one correspondence. The three pins 22 can be positioned along Figure 4 The three pins 22 can be arranged side by side in the vertical direction. Figure 4 The left and right directions are staggered, for example, the upper pin 22 and the lower pin 22 are both located Figure 4 On the left side, another pin 22 is located Figure 4 The right side of the pin 22 is also located in the middle of the two pins 22 in the up-down direction.

[0041] In the above embodiment, the bracket 1 is provided with two elastic pressing blocks 4, which are spaced apart between the three pins 22 and can be used to press the circuit board 21 of the Hall element 2 and also to position the three pins 22 of the Hall element 2.

[0042] For reference Figures 1 to 3On the basis of the embodiments provided above, the present application further provides a brushless motor, including a motor housing, a stator 7, a rotor 6, and of course the above-mentioned Hall sensor assembly. In the brushless motor, the stator 7, the rotor 6 and the Hall sensor assembly are all arranged in the motor housing. For example, the motor housing is provided with a first mounting cavity for accommodating the rotor 6, a second mounting cavity for accommodating the bracket 1, and a third mounting cavity for installing the magnetic conductive sheet 3; the third mounting cavity is arranged between the first mounting cavity and the second mounting cavity, and is used to install the magnetic conductive sheet 3. Usually, the third mounting cavity extends in a zigzag manner, and the magnetic conductive sheet 3 has a bending portion matching the third mounting cavity.

[0043] In the above embodiment, the rotor 6 is specifically a magnetic rotor 6 , one end of the magnetic conductive sheet 3 is fixed to the bracket 1 and the other end extends toward the magnetic rotor 6 , and a magnetic signal can be transmitted between the magnetic rotor 6 and the Hall element 2 .

[0044] In some embodiments, the motor housing is provided with a control panel; the control panel and the bracket 1 are fixedly connected or integrally formed.

[0045] In summary, the brushless motor and its Hall sensor assembly provided by the present application use a bracket 1 to fix the Hall element 2 and the magnetic conductive sheet 3, which can meet the long-distance sensing of the Hall element 2 and the rotor 6, so that the installation position of the Hall element 2 is not limited by the installation position and magnetic induction range of the magnetic rotor 6, and can also make the magnetic field sensing effect of the Hall element 2 more stable and less cluttered, thereby improving the motor commutation performance and NVH (Noise, Vibration, Harshness) performance. The brushless motor provided by the present application combines the Hall sensor assembly and the control board into one, which can reduce costs and make the assembly process more convenient.

[0046] The brushless motor and Hall sensor assembly provided by the present application are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A Hall sensor component, characterized in that: The invention comprises a bracket (1), a Hall element (2) and a magnetic conductive sheet (3); the Hall element (2) is inserted into the bracket (1); one end of the magnetic conductive sheet (3) is inserted into the bracket (1) and is closely attached to the Hall element (2), and the other end of the magnetic conductive sheet (3) is used to extend into the magnetic field of the rotor.

2. The Hall sensor assembly according to claim 1, characterized in that: The bracket (1) is provided with an elastic pressing block (4) for pressing the Hall element (2) toward the magnetic conductive sheet (3).

3. The Hall sensor assembly according to claim 2, characterized in that: The Hall element (2) comprises a circuit board (21) and pins (22); the bracket (1) is provided with a first mounting groove for inserting and positioning the circuit board (21), a second mounting groove for inserting and positioning the pins (22), and a third mounting groove for inserting and positioning the magnetic conductive sheet (3); the elastic pressing block (4) is attached to and presses the circuit board (21), and the third mounting groove is provided with a positioning convex rib (5) protruding toward the circuit board (21).

4. The Hall sensor assembly according to claim 3, characterized in that: The elastic pressing block (4) comprises a root portion (41) and a head portion (42); the root portion (41) is connected to the bracket (1), and the head portion (42) extends outward from the bracket (1); the head portion (42) is provided with an extrusion arc surface protruding toward the circuit board (21).

5. The Hall sensor assembly according to claim 3, characterized in that: The positioning convex rib (5) is semi-cylindrical; more than two positioning convex ribs (5) are arranged in the third installation groove, and all the positioning convex ribs (5) are distributed in the same direction.

6. The Hall sensor assembly according to claim 3, characterized in that: The Hall element (2) comprises a plurality of pins (22), and the bracket (1) is provided with a plurality of pin positioning grooves (11) into which all the pins (22) can be inserted and positioned one by one; all the pin positioning grooves (11) are arranged side by side along a first direction, and some of the pin positioning grooves (11) are staggered with the remaining pin positioning grooves (11) along a second direction; the first direction, the second direction and the insertion direction of any one of the pins (22) are perpendicular to each other.

7. The Hall sensor assembly according to claim 6, characterized in that: The Hall element (2) comprises three pins (22); the bracket (1) is provided with two elastic pressing blocks (4); the two elastic pressing blocks (4) are spaced between the three pins (22).

8. A brushless motor, characterized in that: It comprises a motor housing, a stator, a rotor and a Hall sensor assembly according to any one of claims 1 to 7; the motor housing is provided with: A first mounting cavity capable of accommodating the rotor; A second installation cavity capable of accommodating the bracket (1); A third mounting cavity is arranged between the first mounting cavity and the second mounting cavity; the third mounting cavity extends in a zigzag manner, the magnetic conductive sheet (3) is arranged in the third mounting cavity, and the magnetic conductive sheet (3) has a bending portion matching the third mounting cavity.

9. The brushless motor according to claim 8, characterized in that: The motor housing is provided with a control panel; the control panel and the bracket (1) are fixedly connected or integrally formed.

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