Brushless motor

Abstract

The utility model provides a brushless motor, which comprises a shell, a stator winding, a first circuit board, a rotating shaft, rotor magnetic steel and a second circuit board, the stator winding is fixed in the shell, the first circuit board is arranged at the rear end of the shell, the first circuit board is electrically connected with the stator winding, a strong current cable is led out from the first circuit board, and the second circuit board is electrically connected with the rotating shaft. The rotating shaft is rotatably connected in the shell, the rotor magnetic steel is fixed on the rotating shaft, the second circuit board is arranged at the rear end of the shell, a Hall element is arranged on the second circuit board, and a weak current cable is led out of the second circuit board. According to the brushless motor, the influence of the magnetic field generated by the strong current in the strong current cable on the weak current cable is reduced, so that the detection of the Hall element is more accurate, the use effect of the whole brushless motor is better, and the reliability and stability of the brushless motor are enhanced.

Description

Technical Field

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

[0002] Motors are divided into brushed motors and brushless motors. Brushless motors have many advantages over brushed motors, such as low noise and long life. They have been widely used in many fields such as model aircraft, medical equipment, household appliances and electric vehicles.

[0003] In a brushless motor, the winding needs to be powered by strong electricity (three-phase electricity), and the Hall element needs to be powered by weak electricity. Currently, the strong current cable of the winding and the weak current cable of the Hall element are connected to the same circuit board, and the strong current cable and the weak current cable are close to each other.

[0004] In actual use, the strong current in the strong current cable will generate a magnetic field, which is easy to interfere with the weak current cable, resulting in inaccurate detection of the Hall element, affecting the use effect of the brushless motor. Based on this, the present application proposes a brushless motor. Utility Model Content

[0005] The present application provides a brushless motor, which reduces the influence of the magnetic field generated by the strong current in the strong current cable on the weak current cable, makes the Hall element detection more accurate, makes the entire brushless motor more effective, and enhances the reliability and stability of the brushless motor.

[0006] In order to solve the above technical problems, this application adopts the following technical solutions:

[0007] A brushless motor comprises a shell, a stator winding, a first circuit board, a rotating shaft, a rotor magnet and a second circuit board, wherein the stator winding is fixed in the shell, the first circuit board is arranged at the rear end of the shell, the first circuit board is electrically connected to the stator winding, a strong current cable is led out of the first circuit board, the rotating shaft is rotatably connected in the shell, the rotor magnet is fixed on the rotating shaft, the second circuit board is arranged at the rear end of the shell, a Hall element is provided on the second circuit board, and a weak current cable is led out of the second circuit board.

[0008] In this motor, the stator winding, the rotating shaft and the rotor magnet realize the basic functions of the motor. The strong current cable is connected to the first circuit board, and the weak current cable is connected to the second circuit board, so that the strong current cable and the weak current cable are separated.

[0009] Compared with the existing technology, the brushless motor connects the high-current cable to the first circuit board and the low-current cable to the second circuit board, thereby realizing the separation of the high-current cable from the low-current cable, thereby reducing the influence of the magnetic field generated by the strong current in the high-current cable on the low-current cable, making the Hall element detection more accurate, making the entire brushless motor more effective, and enhancing the reliability and stability of the brushless motor.

[0010] In one embodiment of the present application, a first lead-out hole is provided on the side wall of the housing, and the high-voltage cable passes through the first lead-out hole and is connected to the first circuit board;

[0011] The rear end wall of the shell is provided with a second lead-out hole, and the low-voltage cable passes through the second lead-out hole and is connected to the second circuit board.

[0012] In one embodiment of the present application, a first insulating rubber pad is provided at the first lead-out hole, and a second insulating rubber pad is provided at the second lead-out hole.

[0013] In one embodiment of the present application, a short-circuit connecting wire is provided in the first circuit board, two ends of the short-circuit connecting wire form two connecting holes, and two winding ends of the stator winding to be short-circuited are respectively connected to the two connecting holes.

[0014] In one embodiment of the present application, a plurality of groups of connection holes are provided in the first circuit board, and the plurality of groups of connection holes are arranged in a row.

[0015] In one embodiment of the present application, the rotating shaft extends out of the rear end wall of the shell.

[0016] In one embodiment of the present application, the Hall element is detachably connected to the second circuit board.

[0017] In one embodiment of the present application, the shell includes a shell body, a front end cover and a rear end cover, the front end cover is detachably connected to the front end of the shell body, and the rear end cover is detachably connected to the rear end of the shell body. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of the three-dimensional structure of a brushless motor provided in one embodiment of the present application;

[0020] Figure 2A schematic cross-sectional view of a brushless motor provided in one embodiment of the present application;

[0021] Figure 3 A schematic diagram of the three-dimensional structure of a first circuit board and a high-voltage cable used in a brushless motor provided in an embodiment of the present application;

[0022] Figure 4 A schematic diagram of the three-dimensional structure of a second circuit board, a Hall element and a weak-current cable used in a brushless motor provided in one embodiment of the present application.

[0023] Reference numerals:

[0024] 100, shell; 110, shell body; 120, front cover; 130, rear cover; 140, first lead-out hole; 150, second lead-out hole; 160, first insulating rubber pad; 170, second insulating rubber pad; 200, stator winding; 300, first circuit board; 310, connecting hole; 400, high-voltage cable; 500, rotating shaft; 600, rotor magnet; 700, second circuit board; 800, Hall element; 900, low-voltage cable. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application is clearly and completely described below. Obviously, the described embodiments are 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 also fall within the scope of protection of the present application.

[0026] In the description of the present application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0028] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] Figure 1 A schematic diagram of the three-dimensional structure of a brushless motor provided in one embodiment of the present application. Figure 2 A schematic cross-sectional view of the brushless motor provided in one embodiment of the present application. Figure 3 A schematic diagram of the three-dimensional structure of a first circuit board and a high-voltage cable used in a brushless motor provided in one embodiment of the present application. Figure 4 A schematic diagram of the three-dimensional structure of a second circuit board, a Hall element and a weak-current cable used in a brushless motor provided in one embodiment of the present application.

[0030] The embodiment of the present application provides a brushless motor, such as Figure 1 and Figure 2 As shown, it includes a shell 100, a stator winding 200, a first circuit board 300, a rotating shaft 500, a rotor magnet 600 and a second circuit board 700, wherein the shell 100 is a structure for installing and supporting other components, the stator winding 200, the rotating shaft 500 and the rotor magnet 600 realize the basic functions of the motor, the first circuit board 300 can connect the stator winding 200 to the high-voltage power supply circuit, and the second circuit board 700 can connect the Hall element 800 to the low-voltage power supply circuit.

[0031] like Figure 2 As shown, the housing 100 is generally a cylindrical structure, and various mounting plates, mounting brackets and other structures may be arranged inside to facilitate the installation of components inside.

[0032] like Figure 2 As shown, the stator winding 200 is fixed in the housing 100 to achieve relative fixation with the housing 100 .

[0033] like Figure 2 and Figure 3 As shown, the first circuit board 300 is arranged at the rear end of the shell 100, and the first circuit board 300 is electrically connected to the stator winding 200. A high-voltage cable 400 is led out from the first circuit board 300, so as to connect the stator winding 200 with the high-voltage power supply circuit and provide high voltage for the stator winding 200.

[0034] like Figure 2 As shown, the rotating shaft 500 is rotatably connected in the housing 100. Bearings are provided near both ends of the housing 100. The rotating shaft 500 is rotatably connected to the housing 100 through the bearings, which also enables the rotating shaft 500 to rotate smoothly without jamming.

[0035] like Figure 2 As shown, the rotor magnet 600 is fixed on the rotating shaft 500 , so that the rotor magnet 600 can rotate with the rotating shaft 500 , thereby realizing the basic function of the motor together with the stator winding 200 .

[0036] like Figure 2 and Figure 4 As shown, the second circuit board 700 is disposed at the rear end of the housing 100, and a Hall element 800 is disposed on the second circuit board 700. A weak current cable 900 is led out of the second circuit board 700, so as to connect the Hall element 800 with the weak current power supply circuit to provide weak current for the Hall element 800. Generally, the number of the Hall elements 800 is 3, which are distributed at intervals of 120 degrees.

[0037] In this motor, the stator winding 200, the rotating shaft 500 and the rotor magnet 600 realize the basic functions of the motor. The strong current cable 400 is connected to the first circuit board 300, and the weak current cable 900 is connected to the second circuit board 700, so that the strong current cable 400 and the weak current cable 900 are separated.

[0038] Compared with the prior art, the brushless motor connects the high-current cable 400 to the first circuit board 300 and the low-current cable 900 to the second circuit board 700, thereby realizing the separation of the high-current cable 400 and the low-current cable 900, thereby reducing the influence of the magnetic field generated by the strong current in the high-current cable 400 on the low-current cable 900, making the detection of the Hall element 800 more accurate, making the use effect of the entire brushless motor better, and enhancing the reliability and stability of the brushless motor.

[0039] In some embodiments, Figure 1 As shown, the side wall of the housing 100 is provided with a first lead-out hole 140 , and the high-voltage cable 400 passes through the first lead-out hole 140 and is connected to the first circuit board 300 , so that the high-voltage cable 400 can be led out and connected to the high-voltage power supply circuit.

[0040] like Figure 1 As shown, the rear end wall of the housing 100 is provided with a second lead-out hole 150, and the weak-current cable 900 passes through the second lead-out hole 150 and is connected to the second circuit board 700, so that the weak-current cable 900 can be led out and connected to the weak-current power supply circuit. At the same time, the first lead-out hole 140 and the second lead-out hole 150 are located at different positions of the housing 100, so that the strong-current cable 400 and the weak-current cable 900 are separated, reducing the influence of the strong current on the weak-current cable 900.

[0041] It should be noted that there are five cables led out from the second lead-out hole 150 , two of which are connected to the weak-current power supply circuit, and the remaining three correspond to the outputs of the three Hall elements 800 .

[0042] In some embodiments, Figure 1 As shown, a first insulating rubber pad 160 is provided at the first lead-out hole 140, and a second insulating rubber pad 170 is provided at the second lead-out hole 150, so that the high-voltage cable 400 is in direct contact with the first insulating rubber pad 160, and will not be in direct contact with the housing 100, thereby reducing the possibility of wear of the high-voltage cable 400. Similarly, the low-voltage cable 900 is in direct contact with the second insulating rubber pad 170, and will not be in direct contact with the housing 100, thereby reducing the possibility of wear of the low-voltage cable 900.

[0043] When the traditional stator winding 200 is wound, the ends (wire ends) of the windings need to be short-circuited with each other, leaving only three ends (for connecting three-phase electricity). The ends (wire ends) of the two windings are generally connected by manual welding, which may cause problems such as cold welding and wrong welding, and the welding efficiency of manual welding is also low.

[0044] In some embodiments, Figure 3 As shown, a short-circuit connection line (not shown in the figure) is provided in the first circuit board 300, and two connection holes 310 are formed at both ends of the short-circuit connection line. The two winding ends to be short-circuited of the stator winding 200 are respectively connected to the two connection holes 310. A short-circuit connection line is preset in the first circuit board 300, and connection holes 310 are formed at both ends of the short-circuit connection line. When connecting, it is only necessary to connect the two winding ends to be short-circuited to the two connection holes 310 respectively, which changes the traditional method of short-circuiting two wire ends and reduces the possibility of cold welding and wrong welding. At the same time, this method is also more convenient to use equipment for automatic welding, improving welding efficiency.

[0045] In some embodiments, Figure 3 As shown, the first circuit board 300 is provided with multiple groups of connection holes 310, each group has two connection holes 310, and the multiple groups of connection holes 310 are arranged in a circle. There are multiple winding ends to be short-circuited in the stator winding 200, and multiple short-circuit connecting wires can be arranged in the first circuit board 300 to form multiple groups of connection holes 310, and these multiple groups of connection holes 310 are arranged along the circumferential direction of the first circuit board 300. When connecting, it is only necessary to arrange the multiple winding ends to be short-circuited in a circle, without interlacing or misalignment, and connect them to the connection holes 310 in sequence.

[0046] In some embodiments, Figure 1 and Figure 2 As shown, the rotating shaft 500 extends out of the rear end wall of the housing 100, and the extended portion can be installed with components such as an encoder, a paddle and a sensor plate, so as to realize some required functions.

[0047] In some embodiments, Figure 4As shown, the Hall element 800 is detachably connected to the second circuit board 700. The Hall element 800 is a consumable part, and when damaged, it can be removed from the second circuit board 700 for easy repair and replacement.

[0048] In some embodiments, Figure 2 As shown, the housing 100 includes a housing body 110, a front end cover 120 and a rear end cover 130, wherein the front end cover 120 is detachably connected to the front end of the housing body 110, and the rear end cover 130 is detachably connected to the rear end of the housing body 110. For example, the front end cover 120 and the rear end cover 130 can be connected to the housing body 110 by threaded connection, riveting, etc., so as to realize the detachable connection of the entire housing 100.

[0049] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, ordinary technicians in the field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A brushless motor, characterized in that: include: case; A stator winding, wherein the stator winding is fixed in the housing; A first circuit board, which is disposed at the rear end of the housing, is electrically connected to the stator winding, and has a high-voltage cable extending therefrom; A rotating shaft, the rotating shaft is rotatably connected in the housing; A rotor magnetic steel, wherein the rotor magnetic steel is fixed on the rotating shaft; The second circuit board is arranged at the rear end of the shell, a Hall element is arranged on the second circuit board, and a weak current cable is led out of the second circuit board.

2. The brushless motor according to claim 1, characterized in that: The side wall of the housing is provided with a first lead-out hole, and the high-voltage cable passes through the first lead-out hole and is connected to the first circuit board; The rear end wall of the shell is provided with a second lead-out hole, and the low-voltage cable passes through the second lead-out hole and is connected to the second circuit board.

3. The brushless motor according to claim 2, characterized in that: A first insulating rubber pad is provided at the first lead-out hole, and a second insulating rubber pad is provided at the second lead-out hole.

4. The brushless motor according to claim 1, characterized in that: A short-circuit connecting wire is arranged in the first circuit board, two ends of the short-circuit connecting wire form two connecting holes, and two winding ends of the stator winding to be short-circuited are respectively connected to the two connecting holes.

5. The brushless motor according to claim 4, characterized in that: A plurality of groups of connection holes are arranged in the first circuit board, and the plurality of groups of connection holes are arranged in a row.

6. The brushless motor according to any one of claims 1 to 5, characterized in that: The rotating shaft extends out of the rear end wall of the housing.

7. The brushless motor according to any one of claims 1 to 5, characterized in that: The Hall element is detachably connected to the second circuit board.

8. The brushless motor according to any one of claims 1 to 5, characterized in that: The shell comprises a shell body, a front end cover and a rear end cover. The front end cover is detachably connected to the front end of the shell body, and the rear end cover is detachably connected to the rear end of the shell body.

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