Brushless coreless motor

Abstract

The utility model provides a brushless coreless motor, which is characterized in that a position signal generator with a magnet seat and a magnet is arranged in the brushless coreless motor, the magnet seat is arranged on a rear end cover assembly, the magnet is embedded into the magnet seat, and the magnet seat is fixedly connected with a rotor assembly and is rotatably connected with the rear end cover assembly. According to the brushless coreless motor, the rotor assembly and the magnet are fixedly connected through the magnet seat arranged on the rear end cover assembly, so that the magnet can be relatively embedded in the rear end cover assembly, the magnet is arranged in the shell of the brushless coreless motor, the axial size of the brushless coreless motor is greatly reduced, the structural compactness of the brushless coreless motor is improved, and the service life of the brushless coreless motor is prolonged. Therefore, the space utilization rate of the brushless coreless motor product is improved, and the miniaturization of the brushless coreless motor is easy to realize.

Description

Technical Field

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

[0002] At present, the brushless hollow cup motor is a DC motor. The brushless hollow cup motor has the advantages of small size, high efficiency, high power density, high controllability, etc. The brushless hollow cup motor is widely used in various industrial, medical, aerospace and various scenes in life. Usually, the end of the motor rotor of the brushless hollow cup motor will be connected with the magnet after passing through the rear cover of the motor, so that the magnet is placed outside the housing of the brushless hollow cup motor, resulting in the defects of the brushless hollow cup motor having a long axial dimension and a non-compact structure. Utility Model Content

[0003] In order to solve the above problems, the purpose of the embodiments of the present application is to provide a brushless hollow cup motor.

[0004] In a first aspect, an embodiment of the present application provides a brushless coreless motor, comprising: a housing, a stator assembly, a rotor assembly, a circuit board module, a front cover assembly, a position signal generator, and a rear cover assembly;

[0005] The rotor assembly and the stator assembly are sequentially arranged in a direction from the center to the edge of the housing; the housing, the stator assembly and the rotor assembly are coaxially arranged;

[0006] The front end cover assembly is fixed on one side of the casing and connected to the rotor assembly; the rear end cover assembly is fixed on the other side of the casing;

[0007] The circuit board module is connected to the stator assembly;

[0008] The position signal generator comprises: a magnet seat and a magnet;

[0009] The magnet seat is arranged on the rear end cover assembly; the magnet is embedded in the magnet seat, the magnet seat is fixedly connected to the rotor assembly, and is rotatably connected to the rear end cover assembly.

[0010] In the solution provided in the first aspect of the embodiment of the present application, a position signal generator having a magnet seat and a magnet is provided in the brushless hollow cup motor, the magnet seat is provided on the rear end cover assembly, the magnet is embedded in the magnet seat, the magnet seat is fixedly connected to the rotor assembly and is rotatably connected to the rear end cover assembly. Compared with the method in the related art in which the motor rotor end of the brushless hollow cup motor is connected to the magnetic steel after passing through the rear cover of the motor, so that the magnetic steel is placed outside the housing of the brushless hollow cup motor, the rotor assembly and the magnet are fixedly connected by using the magnet seat provided on the rear end cover assembly, so that the magnet can be relatively embedded in the rear end cover assembly, thereby providing the magnet in the housing of the brushless hollow cup motor, which greatly compresses the axial size of the brushless hollow cup motor, improves the structural compactness of the brushless hollow cup motor, improves the space utilization rate of the brushless hollow cup motor product, and easily realizes the miniaturization of the brushless hollow cup motor.

[0011] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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 some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 A schematic structural diagram of a brushless coreless motor provided in an embodiment of the present application is shown;

[0014] Figure 2 A schematic structural diagram of a magnet seat provided in an embodiment of the present application is shown.

[0015] Icons: 1. Casing; 2. Stator core; 3. Hollow cup winding; 4. Rotating shaft; 5. Magnetic ring; 6. Retaining frame; 7. First circuit board; 8. First end cover; 9. First bearing; 10. Position signal generator; 1001. Magnet seat; 1002. Magnet; 10011. Rotating shaft mounting hole; 10012. Magnet mounting hole; 11. Second end cover; 12. Second bearing. DETAILED DESCRIPTION

[0016] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships 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 referred device or element 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.

[0017] In addition, 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, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0018] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0019] At present, the brushless hollow cup motor is a DC motor. The brushless hollow cup motor has the advantages of small size, high efficiency, high power density, high controllability, etc. The brushless hollow cup motor is widely used in various industrial, medical, aerospace and various scenes in life. Usually, the end of the motor rotor of the brushless hollow cup motor will be connected with the magnet after passing through the rear cover of the motor, so that the magnet is placed outside the housing of the brushless hollow cup motor, resulting in the defects of the brushless hollow cup motor having a long axial dimension and a non-compact structure.

[0020] The brushless hollow cup motor proposed in this application aims to solve the problem that the rotor end of the brushless hollow cup motor passes through the second end cover of the motor and then is sleeved with a magnet, so that the magnet is placed outside the motor housing. This results in the need to reserve a special space in the axial direction of the motor to accommodate the magnet, resulting in a long axial dimension of the brushless hollow cup motor and a non-compact structure.

[0021] Based on this, the following embodiments of the present application propose a brushless hollow cup motor, which provides a position signal generator having a magnet seat and a magnet in the brushless hollow cup motor, and the magnet seat is provided on the rear end cover assembly, and the magnet is embedded in the magnet seat. The magnet seat is fixedly connected to the rotor assembly and rotatably connected to the rear end cover assembly, and the rotor assembly and the magnet are fixedly connected by using the magnet seat provided on the rear end cover assembly, so that the magnet can be relatively embedded in the rear end cover assembly, thereby providing the magnet in the casing of the brushless hollow cup motor. This greatly compresses the axial dimension of the brushless hollow cup motor, improves the structural compactness of the brushless hollow cup motor, improves the space utilization rate of the brushless hollow cup motor product, and easily realizes the miniaturization of the brushless hollow cup motor.

[0022] In the following embodiments, the term "magnet" and the term "magnetic steel" play the same role in the brushless hollow cup motor proposed in this application.

[0023] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and embodiments.

[0024] Example

[0025] See also Figure 1 The structural schematic diagram of the brushless hollow cup motor shown in the figure, this embodiment proposes a brushless hollow cup motor, including: a housing 1, a stator assembly, a rotor assembly, a circuit board module, a front cover assembly, a position signal generator 10 and a rear cover assembly.

[0026] In the housing 1, the rotor assembly and the stator assembly are sequentially arranged from the center to the edge of the housing 1; the housing 1, the stator assembly and the rotor assembly are coaxially arranged. The front cover assembly is fixed to one side of the housing 1 and connected to the rotor assembly; the rear cover assembly is fixed to the other side of the housing 1; and the circuit board module is connected to the stator assembly.

[0027] The position signal generator 10 comprises: a magnet seat 1001 and a magnet 1002; the magnet seat 1001 is arranged on the rear end cover assembly; the magnet 1002 is embedded in the magnet seat 1001; the magnet seat 1001 is fixedly connected to the rotor assembly and is rotatably connected to the rear end cover assembly.

[0028] Specifically, the above-mentioned stator assembly includes: a stator core 2 and a hollow cup winding 3; the outer circumferential surface of the above-mentioned stator core 2 is fixedly connected to the inner circumferential surface of the above-mentioned casing 1; the inner circumferential surface of the above-mentioned stator core 2 is fixedly connected to the outer circumferential surface of the above-mentioned hollow cup winding 3; the above-mentioned casing 1, the above-mentioned stator core 2, the above-mentioned hollow cup winding 3 and the above-mentioned rotor assembly are coaxially arranged; the above-mentioned hollow cup winding 3 is connected to the above-mentioned circuit board module.

[0029] Specifically, the above-mentioned rotor assembly includes: a rotating shaft 4 and a magnetic ring 5; the above-mentioned rotating shaft 4 and the above-mentioned magnetic ring 5 are both arranged in the above-mentioned casing 1; the above-mentioned magnetic ring 5 is sleeved on the above-mentioned rotating shaft 4; the above-mentioned rotating shaft 4, the above-mentioned magnetic ring 5 and the above-mentioned casing 1 are coaxially arranged; one end of the above-mentioned rotating shaft 4 is rotatably connected to the above-mentioned front end cover assembly, and the other end of the above-mentioned rotating shaft 4 passes through the above-mentioned circuit board module and is fixedly arranged on the above-mentioned magnet seat 1001; the above-mentioned magnetic ring 5 can rotate around the above-mentioned hollow cup winding 3.

[0030] From the above description of the rotor assembly and the stator assembly, it can be known that: in the above-mentioned casing 1, the rotating shaft 4, the magnetic ring 5, the hollow cup winding 3 and the stator core 2 are arranged in sequence from the center to the edge of the above-mentioned casing 1; and the rotating shaft 4, the magnetic ring 5, the hollow cup winding 3, the stator core 2 and the casing 1 are coaxially arranged.

[0031] Specifically, the front end cover assembly includes: a first bearing 9 and a first end cover 8; the first end cover 8 is fixed to one side of the housing 1; the first bearing 9 is connected to the first end cover 8 by interference fit; one end of the rotating shaft 4 is rotatably connected to the first end cover 8 through the first bearing 9.

[0032] Specifically, the rear end cover assembly includes: a second bearing 12 and a second end cover 11; the second end cover 11 is fixed to the other side of the housing 1; the second bearing 12 is connected to the second end cover 11 by interference fit; the magnet seat 1001 is rotatably connected to the second end cover 11 through the second bearing 12.

[0033] Specifically, the above-mentioned circuit board module includes: a retaining frame 6 and a first circuit board 7; the above-mentioned retaining frame 6 is installed in the above-mentioned casing 1 and contacts the side of the above-mentioned stator core 2 close to the above-mentioned second end cover 11; the above-mentioned first circuit board 7 is installed on the above-mentioned retaining frame 6, and the above-mentioned first circuit board 7 is electrically connected to the above-mentioned hollow cup winding 3.

[0034] Here, the electrical connection means that the coil terminals of the hollow cup winding 3 are welded on the first circuit board 7 .

[0035] In one embodiment, the retaining frame 6 is an annular structure.

[0036] See also Figure 2As shown in the structural schematic diagram of the magnet seat, the brushless hollow cup motor proposed in this embodiment, the magnet seat 1001 is provided with a shaft mounting hole 10011 on the side close to the shaft 4, and the magnet seat 1001 is provided with a magnet mounting hole 10012 on the side away from the shaft 4; the other end of the shaft 4 passes through the first circuit board 7 and is arranged on the shaft mounting hole 10011 of the magnet seat 1001, and the magnet 1001 is embedded in the magnet mounting hole 10012 of the magnet seat 1001, so that the shaft 4, the magnet seat 1001 and the magnet 1002 rotate synchronously around the second bearing 12.

[0037] In one embodiment, the diameter of the shaft mounting hole 10011 is smaller than the diameter of the magnet mounting hole 10012 .

[0038] Furthermore, the brushless coreless motor provided in this embodiment further includes: a second circuit board (not shown in the figure); the second circuit board is arranged on the second end cover 11 .

[0039] In one embodiment, the second circuit board is a sensor circuit board.

[0040] The sensor circuit board is integrated with a signal receiving chip, which can detect the position signal generated by the position signal generator 10 during rotation, including detecting the position of the rotating shaft 4 and calibrating the zero point position, thereby realizing the position detection function of the brushless hollow cup motor.

[0041] The specific process of the second circuit board realizing the position detection function is prior art and will not be described in detail here.

[0042] The brushless hollow cup motor proposed in this embodiment adopts electronic commutation, the hollow cup winding 3 is stationary, the magnetic ring 5 rotates, and the Hall element (i.e. Figure 1 The magnet 1002 in the figure and the sensor circuit board (not shown) sense the position of the magnetic poles of the magnetic ring 5. Based on this perception, an electronic circuit is used to switch the direction of the current in the coil in a timely manner to ensure that the magnetic force in the correct direction is generated to drive the brushless hollow cup motor.

[0043] In summary, this embodiment proposes a brushless hollow cup motor, by providing a position signal generator with a magnet seat and a magnet in the brushless hollow cup motor, the magnet seat is provided on the rear end cover assembly, the magnet is embedded in the magnet seat, the magnet seat is fixedly connected to the rotor assembly and is rotatably connected to the rear end cover assembly, compared with the method in the related art that the motor rotor end of the brushless hollow cup motor will be connected with the magnetic steel after passing through the rear cover of the motor, so that the magnetic steel is placed outside the housing of the brushless hollow cup motor, the rotor assembly and the magnet are fixedly connected by using the magnet seat provided on the rear end cover assembly, so that the magnet can be relatively embedded in the rear end cover assembly, thereby setting the magnet in the housing of the brushless hollow cup motor, which greatly compresses the axial size of the brushless hollow cup motor, improves the structural compactness of the brushless hollow cup motor, improves the space utilization rate of the brushless hollow cup motor product, and easily realizes the miniaturization of the brushless hollow cup motor.

[0044] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the above claims.

Claims

1. A brushless coreless motor, It is characterized in that include: Casing, stator assembly, rotor assembly, circuit board module, front cover assembly, position signal generator and rear cover assembly; In the housing, the rotor assembly and the stator assembly are sequentially arranged in a direction from the center to the edge of the housing; the housing, the stator assembly and the rotor assembly are coaxially arranged; The front end cover assembly is fixed to one side of the casing and connected to the rotor assembly; The rear end cover assembly is fixed to the other side of the housing; The circuit board module is connected to the stator assembly; The position signal generator comprises: a magnet seat and a magnet; The magnet seat is arranged on the rear end cover assembly; the magnet is embedded in the magnet seat, the magnet seat is fixedly connected to the rotor assembly, and is rotatably connected to the rear end cover assembly.

2. The brushless coreless motor according to claim 1, It is characterized in that The stator assembly comprises: a stator core and a hollow cup winding; The outer circumferential surface of the stator core is fixedly connected to the inner circumferential surface of the housing; the inner circumferential surface of the stator core is fixedly connected to the outer circumferential surface of the hollow cup winding; The housing, the stator core, the hollow cup winding and the rotor assembly are coaxially arranged; The hollow cup winding is connected to the circuit board module.

3. The brushless coreless motor according to claim 2, It is characterized in that The rotor assembly comprises: a rotating shaft and a magnetic ring; The rotating shaft and the magnetic ring are both arranged in the housing; the magnetic ring is sleeved on the rotating shaft; The rotating shaft, the magnetic ring and the housing are coaxially arranged; One end of the rotating shaft is rotatably connected to the front end cover assembly, and the other end of the rotating shaft passes through the circuit board module and is fixedly disposed on the magnet seat; The magnetic ring can rotate around the hollow cup winding.

4. The brushless coreless motor according to claim 3, It is characterized in that The front end cover assembly comprises: a first bearing and a first end cover; The first end cover is fixed to one side of the housing; the first bearing is connected to the first end cover by interference fit; One end of the rotating shaft is rotatably connected to the first end cover through the first bearing.

5. The brushless coreless motor according to claim 3, It is characterized in that The rear end cover assembly comprises: a second bearing and a second end cover; The second end cover is fixed on the other side of the housing; the second bearing is connected to the second end cover by interference fit; The magnet seat is rotatably connected to the second end cover via a second bearing.

6. The brushless coreless motor according to claim 5, It is characterized in that The circuit board module comprises: a holding frame and a first circuit board; The retainer is installed in the housing and contacts the side surface of the stator core close to the second end cover; The first circuit board is mounted on the retaining frame, and the first circuit board is electrically connected to the hollow cup winding.

7. The brushless coreless motor according to claim 6, It is characterized in that A rotating shaft mounting hole is provided on a side of the magnet seat close to the rotating shaft, and a magnet mounting hole is provided on a side of the magnet seat away from the rotating shaft; The other end of the rotating shaft is arranged on the rotating shaft mounting hole of the magnet seat after passing through the first circuit board, and the magnet is embedded in the magnet mounting hole of the magnet seat, so that the rotating shaft, the magnet seat and the magnet rotate synchronously around the second bearing.

8. The brushless coreless motor according to claim 5, It is characterized in that Also includes: a second circuit board; The second circuit board is arranged on the second end cover.

9. The brushless coreless motor according to claim 8, It is characterized in that The second circuit board is a sensor circuit board.

10. The brushless coreless motor according to claim 6, It is characterized in that The retaining frame is in an annular structure.

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