A direct-current brushless motor hall sensor mounting structure

Abstract

The utility model discloses a kind of DC brushless motor hall sensor mounting structure, including stator winding, stator core, hall element, hall bracket and hall base, the top of the hall bracket is equipped with annular slide, the foot of the bottom end of this hall bracket is inserted and fixed on the notch of stator core, the bottom of the hall base is provided with slide rail, and slide rail is installed on annular slide and can be moved along annular slide to adjust the use position of hall base and hall element, three groups of mounting slots are distributed on the top of the hall base, and hall element can be installed in each mounting slot;The utility model can guarantee that hall element can be adjusted to optimum position, hall element is installed in stator winding end position, and forms a whole structure with motor stator, structure is more compact, stator is interchangeable, does not occupy redundant space, effectively reduces motor size, reduces cost.

Description

Technical Field

[0001] This utility model relates to the field of brushless DC motors, specifically a Hall sensor mounting structure for brushless DC motors. Background Technology

[0002] There are two traditional methods for mounting Hall sensors in brushless DC motors: one is to mount the sensor separately, with the Hall sensor mounted on a Hall circuit board that can be fixed to the rear end cover, while the matching Hall sensing permanent magnet is mounted on the rotor. This method allows for adjustable Hall sensor position but requires sufficient installation space and a separate sensing magnet. The other method involves directly bonding the Hall element to the stator core slot, using the motor's main magnet as the Hall sensing permanent magnet. While this method is simple in structure and installation, the Hall element position is not adjustable, making it impossible to guarantee the positional relationship between the Hall output signal and the motor's back electromotive force. Therefore, a new Hall sensor mounting structure for brushless DC motors is proposed. Utility Model Content

[0003] The purpose of this invention is to provide a mounting structure for a Hall sensor in a brushless DC motor, so as to solve the problem of the non-adjustable position of the Hall element mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: A Hall sensor mounting structure for a brushless DC motor includes a stator winding, a stator core, a Hall element, a Hall bracket, and a Hall base. The Hall bracket has an annular slide rail at its top, and the support foot at the bottom of the Hall bracket is inserted into and fixed to the slot of the stator core. The Hall base has a slide rail at its bottom, which is mounted on the annular slide rail and can move along the annular slide rail. Three sets of mounting slots are distributed above the Hall base, and a Hall element can be installed in each set of mounting slots. A through slot is provided between adjacent mounting slots on the Hall base, and a fastener is installed in the through slot. The Hall base is mounted on the Hall bracket by the fastener.

[0005] Furthermore, the Hall base is made of non-metallic insulating material, and an insulating adhesive is coated between the Hall base and the Hall element.

[0006] Furthermore, both the portion of the through groove that accommodates the fastener and the cavity of the mounting groove are filled with epoxy resin.

[0007] Furthermore, the mounting slots are distributed on the Hall base at 120-degree electrical angles.

[0008] Furthermore, the lead wire of the Hall element is tied and fixed to the end of the stator winding.

[0009] Furthermore, the Hall bracket is made of non-magnetic metal.

[0010] The beneficial effects of this utility model are as follows: This utility model has three mounting slots distributed at 120° electrical angles, and the Hall element moves in the circumferential direction along the slide rail to ensure that the Hall element can be adjusted to the optimal position. The Hall sensing permanent magnet is shared with the rotor permanent magnet. At the same time, the Hall element is installed at the end of the stator winding, forming an integral structure with the motor stator. The Hall bracket provides stable support for the entire structure, making the structure more compact. The stator is interchangeable, does not occupy extra space, effectively reduces the size of the motor, and lowers the cost. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural view of the stator winding of this utility model; Figure 2 This is a three-dimensional structural view of the Hall effect support of this utility model; Figure 3 This is a three-dimensional structural view of the Hall effect sensor base of this utility model; Figure 4 This is a schematic diagram of the combined structure of the Hall bracket, Hall base, and stator core of this utility model.

[0012] In the diagram: 1. Stator winding; 2. Hall element; 3. Fastener; 4. Hall bracket; 401. Annular slide rail; 402. Support leg; 5. Hall base; 501. Slide rail; 502. Mounting slot; 503. Through slot; 6. Stator core. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figure 1-4 This invention provides a technical solution for a DC brushless motor Hall sensor mounting structure, comprising a stator winding 1, a stator core 6, a Hall element 2, a Hall bracket 4, and a Hall base 5. The top of the Hall bracket 4 is provided with an annular slide rail 401, and the support foot 402 at the bottom of the Hall bracket 4 is inserted into and fixed in the slot of the stator core 6. The slot depth of the stator core 6 exceeds 3mm, providing sufficient space for mounting the Hall element 2. The bottom of the Hall base 5 is provided with a slide rail 501, which is mounted on the annular slide rail 401 and can move along the annular slide rail 401 to adjust the usage position of the Hall base 5 and the Hall element 2.

[0015] In this embodiment, three sets of mounting slots 502 are distributed above the Hall base 5. Each set of mounting slots 502 can accommodate a Hall element 2. The mounting slots 502 are distributed on the Hall base 5 at 120-degree electrical angles. A through slot 503 is provided between adjacent mounting slots 502 on the Hall base 5. A fastener 3 is provided in the through slot 503. The portion of the through slot 503 that accommodates the fastener 3 and the cavity of the mounting slot 502 are both filled with epoxy resin to prevent the position of the Hall element 2 from changing and to effectively protect the Hall element 2. The fastener 3 is, but is not limited to, bolts or screws. The Hall base 5 is mounted on the Hall bracket 4 by the fastener 3. The Hall bracket 4 is made of non-magnetic metal. The Hall base 5 is made of, but is not limited to, non-metallic insulating material, such as alumina, magnesium oxide ceramic, phenolic resin, or polyvinyl chloride. Insulating adhesive is applied between the Hall base 5 and the Hall element 2. The lead wire of the Hall element 2 is tied and fixed to the end of the stator winding 1.

[0016] It should be noted that the mounting slots 502 mentioned are distributed on the Hall base 5 at 120 electrical degrees. The Hall element 2 is moved in the circumferential direction along the slide rail 501 so that the zero-crossing point of the back electromotive force of the A phase winding is consistent with the zero-crossing point of the A signal of the Hall element 2. After determining the position of the Hall element 2, the Hall base 5 is fixed on the Hall bracket 4 with screws. The Hall element 2 is a Hall sensor.

[0017] The Hall sensor mounting structure for this brushless DC motor has a Hall bracket 4 whose legs 402 are inserted into and fixed in the slot of the stator core 6. The top surface of the Hall bracket 4 is provided with an annular slide rail 401. The bottom end of the Hall base 5 is equipped with a slide rail 501, which is mounted on the annular slide rail 401 and can move along the annular slide rail 401. The Hall element 2 is installed in the mounting slot 502 on the Hall base 5. After the position of the Hall element 2 is determined, the Hall base 5 is fixed to the Hall bracket 4 by fasteners such as screws. The lead wire of the Hall element 2 is tied and fixed to the end of the stator winding 1.

[0018] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0019] The above embodiments only illustrate preferred embodiments of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be understood that for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present utility model, and these all fall within the protection scope of the present utility model. In the present utility model, unless otherwise explicitly specified and limited, the terms "installation", "connection", "joining", "fixing", etc. should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two components or the interaction between two components. Among them, there are various ways of detachable installation, such as by plugging and snapping, or by bolt connection, etc.

[0020] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A mounting structure for a Hall sensor on a brushless DC motor, characterized in that: The device includes a stator winding, a stator core, a Hall element, a Hall bracket, and a Hall base. The Hall bracket has an annular slide rail at its top, and the support legs at the bottom of the Hall bracket are inserted into and fixed to the slots of the stator core. The Hall base has a slide rail at its bottom, which is mounted on the annular slide rail and can move along the annular slide rail. There are three sets of mounting slots distributed above the Hall base, and each set of mounting slots can install a Hall element. There are through slots opened on the Hall base between adjacent mounting slots, and fasteners are installed in the through slots. The Hall base is mounted on the Hall bracket by the fasteners.

2. The mounting structure for a Hall sensor of a brushless DC motor according to claim 1, characterized in that: The Hall base is made of non-metallic insulating material, and insulating adhesive is applied between the Hall base and the Hall element.

3. The mounting structure for a Hall sensor of a brushless DC motor according to claim 1, characterized in that: Both the portion of the through groove that accommodates the fasteners and the cavity of the mounting groove are filled with epoxy resin.

4. The mounting structure for a Hall sensor of a brushless DC motor according to claim 1, characterized in that: The mounting slots are distributed on the Hall base at 120-degree electrical angles.

5. The mounting structure for a Hall sensor of a brushless DC motor according to claim 1, characterized in that: The lead wire of the Hall element is tied and fixed to the end of the stator winding.

6. The mounting structure for a Hall sensor of a brushless DC motor according to claim 1, characterized in that: The Hall effect support is made of non-magnetic metal.

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