CN212183368U - Hall sensor for DC brushless motor - Google Patents

Abstract

The utility model relates to a hall sensor for DC brushless motor, it includes prefabricated section and hall sensor component, the rectangle recess has been seted up to the prefabricated section upper surface, set up in the prefabricated section with the chamber that holds of the interior diapire intercommunication of rectangle recess, hall sensor component bottom surface is fixed with left inserted bar and right inserted bar, the lateral wall that left inserted bar one side was kept away from to right inserted bar and left inserted bar keep away from the length that distance less than or equal to the rectangle recess between the lateral wall of right inserted bar one side, left side inserted bar lower extreme and right inserted bar lower extreme are installed jointly and are held the chamber and support tight subassembly. The fixing effect to hall sensor element has been strengthened to this application, promotes the stability of hall sensor element in the use.

Description

Hall sensor for DC brushless motor

Technical Field

The application relates to the technical field of Hall sensors, in particular to a Hall sensor for a direct-current brushless motor.

Background

The Hall sensor belongs to a reversing switch in a direct current brushless motor, and is mainly used for sensing the position of a rotor, and switching the current direction and the magnetic field change of a driving coil by sensing the change of the magnetic field polarity of the rotor, so that the aim of reversing a driving circuit is fulfilled, and the motor can stably rotate. The Hall sensor is a magnetic induction sensor, and the relative position and the induction distance between a magnetic induction surface of the Hall sensor and the rotor are very important.

The existing Chinese patent with publication number CN206389236U discloses a Hall sensor support for a brushless DC motor driver, which comprises a platform, wherein two clamping jaws are oppositely arranged on the lower end face of the platform, the two clamping jaws are used for clamping a circuit board in a mounting hole to fix the platform, two wedge-shaped bosses are oppositely arranged on the upper end face of the platform, and the two wedge-shaped bosses and the upper end face of the platform form a cavity for fixing a Hall sensor. The utility model discloses a hall sensor support when using, will earlier adopt the hall sensor component pin 90 degrees horizontal shaping of bending of cartridge, during the component installation earlier pack into the platform from hall sensor support side with the hall sensor body that the shaping is good and the cavity that its both sides wedge boss constitutes, then pack into hall sensor and hall sensor support whole the mounting hole of circuit board, utilize the restriction of hall sensor support mounting hole on dog and the circuit board, realize the location to the preceding terminal surface direction of perpendicular to hall sensor.

With respect to the related art among the above, the inventors consider that the following drawbacks exist: when the device is used, the inserted pins of the Hall sensor element are required to be bent for 90 degrees and horizontally molded, the bent parts of the pins of the Hall sensor element are easy to break, and the fixing effect of the Hall sensor element is influenced, so that the stability of the Hall sensor element in the using process is influenced.

SUMMERY OF THE UTILITY MODEL

In order to strengthen the fixed effect of hall sensor element, promote the stability of hall sensor element in the use, this application provides a hall sensor for direct current brushless motor.

The application provides a hall sensor for direct current brushless motor adopts following technical scheme:

a hall sensor for DC brushless motor, including prefabricated section and hall sensor component, the rectangle recess has been seted up to the prefabricated section upper surface, set up in the prefabricated section with the chamber that holds of the interior diapire intercommunication of rectangle recess, hall sensor component bottom surface is fixed with left inserted bar and right inserted bar, the lateral wall that left inserted bar one side was kept away from to right inserted bar and left inserted bar keep away from the length that distance less than or equal to the rectangle recess between the lateral wall of right inserted bar one side, left side inserted bar lower extreme and right inserted bar lower extreme are installed jointly and are held the chamber and support tight subassembly.

Through adopting above-mentioned technical scheme, in the use, the staff only need weld the prefabricated section on DC brushless motor's casing, afterwards, the staff need pass the rectangle recess with left inserted bar and right inserted bar, so that support tight subassembly and hold the chamber and support tightly, thereby played good limited effect to hall sensor element position on the prefabricated section, hall sensor element self structure is difficult for taking place to damage, hall sensor element's fixed effect has been strengthened, promote hall sensor element's stability in the use.

Preferably, support tight subassembly including install in left grafting pole lower extreme and with it slide the left stopper of being connected, install in right grafting pole lower extreme and slide the right stopper of being connected with it and set up the first spring between left stopper and right stopper, left side stopper and right stopper all with hold the chamber cooperation of sliding, the distance between the lateral wall that first spring one side was kept away from to right stopper and the lateral wall that first spring one side was kept away from to left stopper is less than the length of rectangle recess.

Through adopting above-mentioned technical scheme, when installing hall sensor element on the prefabricated section, the staff only needs simultaneously to press left stopper and right stopper to the one side that is close to first spring, so that left stopper passes the rectangle recess with right stopper simultaneously, get into when left stopper and right stopper and hold the chamber after, under the spring action of first spring, left stopper gets into the intracavity that holds of first spring both sides respectively with right stopper, thereby the condition that left peg graft pole and right peg graft pole break away from the rectangle recess has been avoided, hall sensor element's stability in the use has been strengthened.

Preferably, a left chamfer is formed on an intersecting edge between the bottom surface of the left limiting block and the side wall of the left limiting block, which is far away from one side of the first spring, and a right chamfer is formed on an intersecting edge between the bottom surface of the right limiting block and the side wall of the right limiting block, which is far away from one side of the first spring.

Through adopting above-mentioned technical scheme, through setting up left chamfer and right chamfer, at the in-process of installation left stopper and right stopper, the position that left chamfer is close to left stopper bottom surface and the position that right chamfer is close to right stopper take the lead into the rectangle recess in, afterwards, the staff only needs top-down to promote hall sensor element and can accomplish the installation to this degree of difficulty that has reduced staff installation left stopper and right stopper.

Preferably, the lateral wall that first spring one side was kept away from to left side grafting pole is laminated with the lateral wall of one side wherein of rectangle recess, the lateral wall that first spring one side was kept away from to right side grafting pole is laminated with the lateral wall of rectangle recess opposite side, the cross section of left side grafting pole and the cross section of right grafting pole are the T shape of handstand, set up the left T shape spout of being connected with left grafting pole slip on the lateral wall that first spring one side was kept away from to left stopper, set up the right T shape spout of being connected with right grafting pole slip on the lateral wall that first spring one side was kept away from to right stopper.

Through adopting above-mentioned technical scheme, the lateral wall that first spring one side was kept away from to left grafting pole, the lateral wall that first spring one side was kept away from to right grafting pole are laminated with the lateral wall of rectangle recess both sides respectively to this has strengthened the stability of left grafting pole and right grafting pole in the use, has reduced left grafting pole and the gliding condition of right grafting pole along the rectangle recess in the use. Through setting up left T shape spout, the staff is passing the in-process of rectangle recess with left stopper, and for the installation of being convenient for, the staff can slide the lateral wall of keeping away from first spring one side with left peg graft pole to the one end parallel and level of keeping away from first spring with left T shape spout. Through setting up right T shape spout, the staff is passing the in-process of rectangle recess with right spacing block, and for the installation of being convenient for, the staff can keep away from the lateral wall of first spring one side with right peg graft pole and slide to the one end parallel and level of keeping away from first spring with right T shape spout.

Preferably, set up on the lateral wall of one side wherein of the prefabricated section and hold the left mounting groove of chamber intercommunication, the extending direction of left side mounting groove is parallel with the flexible direction of first spring, install left conflict subassembly in the left side mounting groove.

Set up on the lateral wall of prefabricated section opposite side and hold the right mounting groove of chamber intercommunication, the extending direction of right side mounting groove is parallel with the flexible direction of first spring, install the right side in the mounting groove and contradict the subassembly.

Through adopting above-mentioned technical scheme, set up left conflict subassembly in left mounting groove, and set up right conflict subassembly in right mounting groove, so that the staff presses left stopper and right stopper simultaneously through left conflict subassembly and right conflict subassembly, so that first spring shrink, so that left stopper and right stopper reverse pass the rectangle recess, and dismantle hall sensor element, be favorable to the staff to change the hall sensor element of damage.

Preferably, the left side subassembly of contradicting includes the left fixed plate that pastes and fixes with the inner wall of left mounting groove, runs through and sets up on left fixed plate and with it the left slide bar of the complex that slides, keep away from the fixed left pressure piece of one end of first spring and set up in the left second spring of pressing between piece and the left fixed plate according to the piece and setting up, the distance between left slide bar and the left stopper is less than the original length of second spring.

Through adopting above-mentioned technical scheme, when using left conflict subassembly to order about left stopper to the one side removal that is close to first spring, the staff only need press the left side to the one side that is close to first spring and press the briquetting to this makes first spring shrink, and after left slide bar and left stopper butt, left slide bar promotes left stopper and removes to the one side that is close to first spring, so that the staff takes out left stopper from holding the intracavity.

Preferably, when the second spring is in the original length, the surface of one side of the left pressing block, which is far away from the first spring, is flush with one end, which is far away from the first spring, of the left mounting groove.

Through adopting above-mentioned technical scheme, when normal use, the one end parallel and level that first spring was kept away from to the surface and the left mounting groove of first spring one side are kept away from to the left side according to the briquetting to this makes the left side press the briquetting to play the effect of good shutoff left mounting groove, has reduced debris and has got into the probability in the left mounting groove, so that the staff operates left conflict subassembly smoothly.

Preferably, the bottom surface of the Hall sensor element is attached to the upper surface of the prefabricated block.

By adopting the technical scheme, in the using process, the bottom surface of the Hall sensor element is attached to the upper surface of the prefabricated block, so that the probability that sundries enter the rectangular groove from the gap between the bottom surface of the Hall sensor element and the upper surface of the prefabricated block is reduced, and the Hall sensor can be normally used.

In summary, the present application includes at least one of the following beneficial technical effects:

in the application, in the using process, a worker only needs to weld the prefabricated block on the shell of the brushless direct current motor, and then needs to enable the left inserting rod and the right inserting rod to penetrate through the rectangular groove, so that the abutting component is abutted against the accommodating cavity, a good limiting effect is achieved on the position of the Hall sensor element on the prefabricated block, the structure of the Hall sensor element is not prone to damage, the fixing effect of the Hall sensor element is enhanced, and the stability of the Hall sensor element in the using process is improved;

in the application, by arranging the left chamfer and the right chamfer, in the process of installing the left limiting block and the right limiting block, the position of the left chamfer close to the bottom surface of the left limiting block and the position of the right chamfer close to the right limiting block enter the rectangular groove first, and then, a worker only needs to push the Hall sensor element from top to bottom to complete the installation work, so that the difficulty of installing the left limiting block and the right limiting block by the worker is reduced;

this application sets up left conflict subassembly in left mounting groove to set up right conflict subassembly in right mounting groove, so that the staff presses left stopper and right spacing piece simultaneously through left conflict subassembly and right conflict subassembly, so that first spring shrink, so that left stopper and right spacing piece reverse pass the rectangle recess, and dismantle hall sensor element, be favorable to the staff to change the hall sensor element of damage.

Drawings

Fig. 1 is a schematic structural diagram of a hall sensor for a dc brushless motor according to an embodiment of the present invention.

Fig. 2 is a cross-sectional view of a preform block in an embodiment of the application.

FIG. 3 is a partial structural cross-sectional view of an embodiment of the application.

Description of reference numerals: 1. prefabricating blocks; 11. a rectangular groove; 12. an accommodating chamber; 13. a left mounting groove; 14. a right mounting groove; 2. a Hall sensor element; 21. a left insertion rod; 22. a right insertion rod; 3. a propping component; 31. a left stop block; 311. a left T-shaped chute; 312. left chamfering; 32. a right stopper; 321. a right T-shaped chute; 322. right chamfering; 33. a first spring; 4. a left interference component; 41. a left fixing plate; 42. a left slide bar; 43. a left pressing block; 44. a second spring; 5. a right interference component; 51. a right fixing plate; 52. a right slide bar; 53. a right pressing block; 54. and a third spring.

Detailed Description

The present application is described in further detail below with reference to figures 1-3.

The embodiment of the application discloses a Hall sensor for a direct-current brushless motor. Referring to fig. 1, the hall sensor for the dc brushless motor comprises a prefabricated block 1 and a hall sensor element 2, wherein the prefabricated block 1 is in a block-shaped structure with a rectangular cross section, the prefabricated block 1 is made of steel, and the prefabricated block 1 is welded on a shell of the dc brushless motor. As shown in fig. 2, the precast block 1 is provided with a rectangular groove 11 and an accommodating cavity 12, the cross section of the rectangular groove 11 is rectangular, and the rectangular groove 11 is formed in the upper surface of the precast block 1. Hold chamber 12 and be the cuboid shape cavity, it is seted up inside prefabricated section 1, holds the interior roof of chamber 12 and the interior diapire intercommunication of rectangle recess 11, and the length that holds chamber 12 is greater than the length of rectangle recess 11.

Referring to fig. 1, the bottom of the hall sensor element 2 is rectangular and is mounted on the prefabricated block 1, the bottom surface of the hall sensor element 2 is attached to the upper surface of the prefabricated block 1, and as shown in fig. 3, the hall sensor element 2 is provided with a left insertion rod 21 and a right insertion rod 22. Left peg graft pole 21 and right peg graft pole 22 are the rod-like structure of transversal personally submitting handstand "T" shape, the upper end of left peg graft pole 21 and the upper end of right peg graft pole 22 all are fixed with hall sensor element 2's bottom surface, the vertical portion of left peg graft pole 21 and the vertical portion of right peg graft pole 22 all run through rectangle recess 11 and the cooperation of sliding with it, and the lateral wall that right peg graft pole 22 one side was kept away from to left peg graft pole 21 and the lateral wall laminating of rectangle recess 11 one side wherein, the lateral wall that left peg graft pole 21 one side was kept away from to right peg graft pole 22 and the lateral wall laminating of rectangle recess 11 opposite side, with this the condition of taking place the skew in rectangle recess 11 in left peg graft pole 21 and right peg graft pole 22 in the use has been avoided, be favorable to reinforcing hall sensor element 2 stability in the use.

Referring to fig. 3, the lower end of the left insertion rod 21 and the lower end of the right insertion rod 22 are jointly installed with the abutting assembly 3 for abutting the abutting assembly 3 against the inner wall of the accommodating cavity 12, and the abutting assembly 3 includes a left limit block 31, a right limit block 32 and a first spring 33. Left stopper 31 is rectangle massive structure, and it sets up in left peg graft pole 21 lower extreme, and left stopper 31 with hold chamber 12 cooperation of sliding, and left T shape spout 311 has been seted up on the lateral wall of left stopper 31 keeping away from right peg graft pole 22 one side. The cross section of the left T-shaped sliding groove 311 is inverted T-shaped, the upper end of the vertical part of the left T-shaped sliding groove 311 is communicated with the upper surface of the left limiting block 31, and the left T-shaped sliding groove 311 is connected with the left insertion rod 21 in a sliding mode. Right stopper 32 is rectangle massive structure, and it sets up in right peg graft pole 22 lower extreme, and right stopper 32 with hold chamber 12 cooperation of sliding, and has seted up right T shape spout 321 on the lateral wall of right stopper 32 keeping away from left peg graft pole 21 one side. The cross section of the right T-shaped sliding groove 321 is inverted T-shaped, the upper end of the vertical part of the right T-shaped sliding groove 321 is communicated with the upper surface of the right limiting block 32, and the right T-shaped sliding groove 321 is connected with the right insertion rod 22 in a sliding mode.

Referring to fig. 3, the first spring 33 is disposed between the left stopper 31 and the right stopper 32, one end of the first spring 33 is fixed to the side wall of the left stopper 31 close to the right stopper 32, the other end of the first spring 33 is fixed to the side wall of the right stopper 32 close to the left stopper 31, and in this embodiment, the distance between the side wall of the right stopper 32 far away from the first spring 33 and the side wall of the left stopper 31 far away from the first spring 33 is smaller than the length of the rectangular groove 11. When the hall sensor element 2 is installed on the prefabricated block 1, the worker only needs to press the left limiting block 31 and the right limiting block 32 towards the middle at the same time, so that the first spring 33 is contracted, the distance between the side wall of the left limiting block 31 far away from the first spring 33 and the side wall of the right limiting block 32 far away from the first spring 33 is smaller than the length of the rectangular groove 11, the left limiting block 31 and the right limiting block 32 can conveniently pass through the rectangular groove 11, after the left limiting block 31 and the right limiting block 32 enter the accommodating cavity 12, the left limiting block 31 and the right limiting block 32 are reset under the elastic force of the first spring 33, so that the left insertion rod 21 and the right insertion rod 22 are well limited, the situation that the left insertion rod 21 and the right insertion rod 22 are separated from the prefabricated block 1 from the rectangular groove 11 is avoided, and the installation work of the hall sensor element 2 on the prefabricated block 1 is completed, the stability of the hall sensor element 2 during use is enhanced.

Referring to fig. 3, a left chamfer 312 is formed on the left stopper 31, the left chamfer 312 is an inclined surface structure, and the left chamfer 312 is formed on an intersecting edge between the bottom surface of the left stopper 31 and the side wall of the left stopper 31 on the side far away from the first spring 33. The right limiting block 32 is provided with a right chamfer 322, the right chamfer 322 is an inclined plane structure, and the right chamfer 322 is arranged on the intersecting edge between the bottom surface of the right limiting block 32 and the side wall of the right limiting block 32 far away from the first spring 33. Through the arrangement of the left chamfer 312 and the right chamfer 322, the distance between the edge of the left chamfer 312 close to one side of the first spring 33 and the edge of the right chamfer 322 close to one side of the first spring 33 is smaller than the length of the rectangular groove 11, so that the difficulty of installing the left limiting block 31 and the right limiting block 32 into the accommodating cavity 12 from the rectangular groove 11 by workers is reduced.

Referring to fig. 2, a left mounting groove 13 and a right mounting groove 14 are further formed in the precast block 1, the cross section of the left mounting groove 13 and the cross section of the right mounting groove 14 are both circular, the axis of the left mounting groove 13 coincides with the axis of the right mounting groove 14, as shown in fig. 3, the extending direction of the left mounting groove 13 is parallel to the extending direction of the first spring 33, and the left mounting groove 13 and the right mounting groove 14 are respectively communicated with two ends of the accommodating cavity 12.

Referring to fig. 3, a left interference assembly 4 is installed in the left installation groove 13, and the left interference assembly 4 includes a left fixing plate 41, a left slide rod 42, a left pressing block 43, and a second spring 44. The left fixing plate 41 is a circular plate-shaped structure, the axis of the left fixing plate is overlapped with the axis of the left mounting groove 13, and the arc-shaped surface of the left fixing plate 41 is fitted and fixed with the inner arc-shaped surface of the left mounting groove 13. The left sliding rod 42 is a round rod structure, the axis of the left sliding rod 42 coincides with the axis of the left fixing plate 41, and the left sliding rod 42 penetrates through the left fixing plate 41 and is in sliding fit with the left fixing plate 41. The left pressing block 43 is a disc-shaped structure, the axis of the left pressing block coincides with the axis of the left slide rod 42, and the side wall of the left pressing block 43 close to the left fixing plate 41 is fixed with one end of the left slide rod 42 far away from the first spring 33. The extending and retracting direction of the second spring 44 is parallel to the axial direction of the left sliding rod 42, the second spring 44 is sleeved outside the left sliding rod 42, one end of the second spring 44 is fixed to the side wall of the left pressing block 43 on the side close to the first spring 33, the other end of the second spring 44 is fixed to the side wall of the left fixing plate 41 on the side far away from the first spring 33, and the distance between the left sliding rod 42 and the left limiting block 31 is smaller than the original length of the second spring 44.

Referring to fig. 3, a right interference assembly 5 is installed in the right installation groove 14, and the right interference assembly 5 includes a right fixing plate 51, a right sliding rod 52, a right pressing block 53, and a third spring 54. The right fixing plate 51 has a circular plate-shaped structure, the axis of the right fixing plate coincides with the axis of the right mounting groove 14, and the arc-shaped surface of the right fixing plate 51 is fitted and fixed with the inner arc-shaped surface of the right mounting groove 14. The right sliding rod 52 is a round rod structure, the axis of the round rod structure coincides with the axis of the right fixing plate 51, and the right sliding rod 52 penetrates through the right fixing plate 51 and is matched with the right fixing plate in a sliding manner. The right pressing block 53 is a disc-shaped structure, the axis of the right pressing block is overlapped with the axis of the right slide rod 52, and the side wall of the right pressing block 53 close to the right fixing plate 51 is fixed with one end of the right slide rod 52 far away from the first spring 33. The extension direction of the third spring 54 is parallel to the axial direction of the right slide rod 52, the third spring is sleeved outside the right slide rod 52, one end of the third spring 54 is fixed to the side wall of the right pressing block 53 close to one side of the first spring 33, the other end of the third spring 54 is fixed to the side wall of the right fixing plate 51 far away from one side of the first spring 33, and the distance between the right slide rod 52 and the right limiting block 32 is smaller than the original length of the third spring 54.

Referring to fig. 3, by providing the left and right interference assemblies 4 and 5, when the hall sensor element 2 is damaged and needs to be replaced, the worker only needs to press the left pressing block 43 and the right pressing block 53 at the same time, so that the second spring 44 and the third spring 54 are contracted at the same time, in the process, the left slide bar 42 and the right slide bar 52 both slide to a side close to the first spring 33, thereby causing the left sliding rod 42 to push the left stopper 31 to move to a side close to the first spring 33, meanwhile, the right sliding rod 52 pushes the right fixing plate 51 to move towards the side close to the first spring 33 until the distance between the side wall of the left limiting block 31 far away from the first spring 33 and the side wall of the right limiting block 32 far away from the first spring 33 is smaller than the length of the rectangular groove 11, and the hall sensor element 2 can be taken down by pulling the hall sensor element 2 upwards, so that the damaged hall sensor element 2 can be replaced.

Referring to fig. 3, when the second spring 44 is at the original length, the surface of the left pressing block 43 away from the first spring 33 is flush with the end of the left mounting groove 13 away from the first spring 33, and the surface of the right pressing block 53 away from the first spring 33 is flush with the end of the right mounting groove 14 away from the first spring 33, so that the left mounting groove 13 and the right mounting groove 14 are respectively blocked by the left pressing block 43 and the right pressing block 53, thereby reducing the situation that sundries enter the left mounting groove 13 and the right mounting groove 14, and facilitating the smooth detachment of the damaged hall sensor element 2 by a worker.

The implementation principle of the hall sensor for the direct-current brushless motor in the embodiment of the application is as follows: in the use, the staff only need weld prefabricated section 1 on DC brushless motor's casing, afterwards, the staff need pass rectangle recess 11 with left peg graft pole 21 and right peg graft pole 22, so that support tight subassembly 3 and hold chamber 12 and support tightly, thereby played good limited effect to hall sensor element 2 position on prefabricated section 1, hall sensor element 2 self structure is difficult for taking place to damage, hall sensor element 2's fixed effect has been strengthened, promote hall sensor element 2 stability in the use.

In this scheme, when installing hall sensor element 2 on prefabricated section 1, the staff only need press left stopper 31 and right stopper 32 to the one side that is close to first spring 33 simultaneously, so that left stopper 31 passes rectangle recess 11 with right stopper 32 simultaneously, after left stopper 31 and right stopper 32 get into and hold chamber 12, under the spring action of first spring 33, left stopper 31 gets into the chamber 12 that holds of first spring 33 both sides respectively with right stopper 32 in, thereby left peg graft pole 21 and the condition that right peg graft pole 22 breaks away from rectangle recess 11 have been avoided, hall sensor element 2's stability in the use has been strengthened.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides a hall sensor for direct current brushless motor, a serial communication port, including prefabricated section (1) and hall sensor component (2), rectangle recess (11) have been seted up to prefabricated section (1) upper surface, set up chamber (12) that hold with the interior diapire intercommunication of rectangle recess (11) in prefabricated section (1), hall sensor component (2) bottom surface is fixed with left inserted bar (21) and right inserted bar (22), the lateral wall of left inserted bar (21) one side is kept away from in right inserted bar (22) and left inserted bar (21) keep away from the length that distance between the lateral wall of right inserted bar (22) one side is less than or equal to rectangle recess (11), left inserted bar (21) lower extreme and right inserted bar (22) lower extreme install jointly and hold chamber (12) and support tight subassembly (3).

2. The hall sensor for a dc brushless motor according to claim 1, wherein: support tight subassembly (3) including install in left plug rod (21) lower extreme and with it slide left stopper (31) of being connected, install in right plug rod (22) lower extreme and slide right stopper (32) of being connected with it and set up first spring (33) between left stopper (31) and right stopper (32), left side stopper (31) and right stopper (32) all with hold chamber (12) and slide the cooperation, the distance between the lateral wall of first spring (33) one side is kept away from in right stopper (32) and left stopper (31) one side is kept away from between the lateral wall of first spring (33) one side is less than the length of rectangle recess (11).

3. The hall sensor for a dc brushless motor according to claim 2, wherein: the bottom surface of left side stopper (31) and left stopper (31) are kept away from crossing edge between the lateral wall of first spring (33) one side and have been seted up left chamfer (312), right chamfer (322) have been seted up on crossing edge between the lateral wall of first spring (33) one side is kept away from with right stopper (32) to the bottom surface of right stopper (32).

4. The hall sensor for a dc brushless motor according to claim 2, wherein: the side wall of one side of the first spring (33) and the side wall of one side of the rectangular groove (11) are far away from the left inserting rod (21), the side wall of one side of the first spring (33) and the side wall of the other side of the rectangular groove (11) are far away from the right inserting rod (22), the cross section of the left inserting rod (21) and the cross section of the right inserting rod (22) are inverted T-shaped, a left T-shaped sliding groove (311) connected with the left inserting rod (21) in a sliding mode is formed in the side wall of one side of the left limiting block (31) far away from the first spring (33), and a right T-shaped sliding groove (321) connected with the right inserting rod (22) in a sliding mode is formed in the side wall of one side of the right limiting block (32) far away from the first spring.

5. The hall sensor for a dc brushless motor according to claim 2, wherein: a left mounting groove (13) communicated with the accommodating cavity (12) is formed in the side wall of one side of the precast block (1), the extending direction of the left mounting groove (13) is parallel to the telescopic direction of the first spring (33), and a left abutting assembly (4) is mounted in the left mounting groove (13);

set up on the lateral wall of prefabricated section (1) opposite side and hold right mounting groove (14) of chamber (12) intercommunication, the extending direction of right side mounting groove (14) is parallel with the flexible direction of first spring (33), install right conflict subassembly (5) in right side mounting groove (14).

6. The hall sensor for a dc brushless motor according to claim 5, wherein: the left side is contradicted subassembly (4) and is included and fixed left fixed plate (41) with the inner wall laminating of left mounting groove (13), run through and set up on left fixed plate (41) and with its sliding fit's left slide bar (42), keep away from fixed left side of one end of first spring (33) with left slide bar (42) and press piece (43) and set up in a left side and press second spring (44) between piece (43) and left fixed plate (41), the distance between left side slide bar (42) and left stopper (31) is less than the original length of second spring (44).

7. The hall sensor for a dc brushless motor according to claim 6, wherein: when the second spring (44) is in the original length, the surface of one side, away from the first spring (33), of the left pressing block (43) is flush with one end, away from the first spring (33), of the left mounting groove (13).

8. The hall sensor for a dc brushless motor according to claim 1, wherein: the bottom surface of the Hall sensor element (2) is attached to the upper surface of the prefabricated block (1).

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