Outer rotor motor for unmanned aerial vehicle and rotor shell processing method of outer rotor motor

Abstract

The invention discloses an external rotor motor for an unmanned aerial vehicle and a rotor shell processing method of the external rotor motor. The method comprises the following steps: S1, designing a rotor shell of the motor; s2, a rotor shell blank is obtained in a casting mode; and S3, machining the rotor shell blank. On the basis of the outer teeth in the circumferential direction, rotation data of the motor can be collected by means of the data collecting device, monitoring data are transmitted to the ground, flight accidents are effectively avoided, and when rotation stopping is caused by faults, maintainers can be helped to judge fault positions at the first time, and the maintenance efficiency is improved. By means of cooperation of the outer teeth in the circumferential direction of the rotor shell and the rotation stopping device, the blades can be stopped in time during landing, especially on a compact unmanned aerial vehicle with a plurality of staggered blades, the blades are braked in time, the rotation stopping positions of the blades are controlled, mutual interference among the blades can be effectively avoided, and the stability of the unmanned aerial vehicle is improved. And the problems of production cost caused by using a sensor to control the position of the paddle and high cost of remedial measures once hardware is damaged are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of external rotor motors, in particular to an external rotor motor for an unmanned aerial vehicle and a method for processing a rotor shell of the external rotor motor. Background Art

[0002] Aerial photography drones need to fly stably during aerial photography. Therefore, low-KV motors with large propellers should be used for aerial photography. They have low speed and high efficiency. Low-speed motors also have low vibration. Therefore, aerial photography drones mostly use outer rotor motors, but the stator of the outer rotor motor is completely included in the rotor.

[0003] When there are internal problems in the motor, such as armature windings, stator cores, and Ni-Fe-B magnets, which cause the motor to stop, it is difficult to know the fault location from the appearance, and it is impossible to determine the fault location immediately. Generally, the motor needs to be disassembled for inspection one by one, which is extremely inefficient. Moreover, when there are general faults that do not cause the motor to stop immediately, because the drone is flying at high altitude, it is difficult to provide timely feedback from the drone to the ground, resulting in delayed problem discovery, affecting flight safety and post-flight maintenance and repairs.

[0004] In addition, the existing motors do not have a quick braking function. When the drone lands, the blades cannot stop in time. At the same time, based on the compact drone, the positions of multiple blades are fixed to prevent mutual interference. The existing method of controlling the blade position is achieved through multiple sensors, which is costly. Once the hardware is damaged, the production cost and remedial measures cost are extremely high. Summary of the invention

[0005] The purpose of the present invention is to provide an outer rotor motor for a drone and a method for processing the rotor shell of the outer rotor motor, so as to solve the problems of difficulty in repairing internal faults of the existing drone outer rotor motor, delayed problem discovery and the lack of a brake function in the motor, which leads to extremely high production costs and remedial measures costs for compact drones.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions: A method for machining a rotor housing of an outer rotor motor comprises the following steps: S1. Design the rotor housing of the motor; S2, obtaining a rotor housing blank by casting; S3, machining rotor housing blank: First order: CNC lathe rough and fine turning of the outer circle in the end face direction, end face groove and rough turning of small holes; Second order: CNC lathe rough and fine turning of the outer circle of the large hole direction, the tapered hole and fine turning of the magnetic steel pasting position; The third sequence: The machining center uses three axes to rough and fine mill the 12 internal ribs and 12 fan-shaped bottom holes; The fourth sequence: The three axes of the machining center drill and tap the end face of the rotor housing blank, a 2 mm drill drills through the keyway position, and a 1 mm milling cutter mills two holes; Fifth order: wire cutting the arched keyway through the fourth order reserved hole; Sixth sequence: The machining center uses four-axis roughing and finishing to mill and chamfer 58 teeth, and leaves a scale indicating the angle with the arched keyway on the first tooth or the 58th tooth or the first and 58th teeth; S4. Anticorrosion treatment: Electrophoretic paint; S5. Bonding magnetic steel: Apply glue to the bonding parts of the magnets on the rotor housing, place the magnets in the order of N and S poles, and glue them firmly.

[0007] A further technical solution is: in the sixth sequence, in the arrangement order from the 1st tooth to the 58th tooth, the midline spacing angle between every two adjacent teeth is 6°, and the position between the 1st tooth and the 58th tooth is a stop position.

[0008] A further technical solution is that position marking holes are provided on two teeth on the diagonal line of the rotor housing.

[0009] A further technical solution is: in the above S4, a sleeve is used to seal the tapered shaft hole and the magnetic steel position of the rotor housing to prevent them from being adsorbed and painted.

[0010] An outer rotor motor for a drone comprises a rotor housing. The drone is provided with a data acquisition device adapted to 58 teeth.

[0011] A further technical solution is that a stop device adapted to the stop position is provided on the drone.

[0012] A further technical solution is: the stopping device is an electromagnetic telescopic rod, a cross plate, a brake plate and a spring, the electromagnetic telescopic rod is installed on the drone, the cross plate is installed on the telescopic end of the electromagnetic telescopic rod, the brake plate is installed on the cross plate through the spring, and a guide column is arranged between the brake plate and the cross plate.

[0013] A further technical solution is that the width of the brake plate is not less than the distance between two adjacent teeth and is not greater than the width of the stop position.

[0014] A further technical solution is that the width of the transverse plate is greater than the width of the stop position.

[0015] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: The present invention proposes a rotor casing processing method for an outer rotor motor and an outer rotor motor. The rotor casing processing method is used to produce a rotor casing of an outer rotor motor with external teeth. Based on the circumferential external teeth, the rotation data of the motor can be collected with the help of a data acquisition device. Even when flying at high altitudes, the monitoring data can be transmitted to the ground to effectively avoid the occurrence of flight accidents. When a fault causes a stop, it can also help maintenance personnel to determine the fault location in the first time, thereby improving maintenance efficiency, that is, the fault location can be inferred from the appearance.

[0016] With the help of the cooperation of the circumferential external teeth of the rotor housing and the stop device, the blades can be controlled to stop in time during landing. Especially on compact UAVs with multiple blades intertwined with each other, timely braking of the blades and controlling the stop position of each blade can effectively avoid mutual interference between the blades, and avoid the production costs brought about by using sensors to control the blade position and the high cost of remedial measures once the hardware is damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the outer rotor motor in the present invention.

[0018] Figure 2 It is a schematic diagram of the structure of the rotor housing in the present invention.

[0019] Figure 3 For the present invention Figure 2 Schematic diagram of the structure from a top-down perspective.

[0020] Figure 4 For the present invention Figure 2 Schematic diagram of the structure from an upward perspective.

[0021] Figure 5 For the present invention Figure 2 Schematic diagram of the structure from a half-section perspective.

[0022] Figure 6 It is a structural schematic diagram of the stop device in the present invention.

[0023] Figure numerals: 1. stop device; 2. electromagnetic telescopic rod; 3. cross plate; 4. brake plate; 5. spring; 6. guide column. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invented product is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0030] In this embodiment, Figure 1 As shown, a method for machining a rotor housing of an outer rotor motor comprises the following steps: S1. Design the rotor housing of the motor; S2, obtaining a rotor housing blank by casting; S3, machining rotor housing blank: First order: CNC lathe rough and fine turning of the outer circle in the end face direction, end face groove and rough turning of small holes; Second order: CNC lathe rough and fine turning of the outer circle of the large hole direction, the tapered hole and fine turning of the magnetic steel pasting position; The third sequence: The machining center uses three axes to rough and fine mill the 12 internal ribs and 12 fan-shaped bottom holes; The fourth sequence: The three axes of the machining center drill and tap the end face of the rotor housing blank, a 2 mm drill drills through the keyway position, and a 1 mm milling cutter mills two holes; Fifth order: wire cutting the arched keyway through the fourth order reserved hole; Sixth sequence: The machining center uses four-axis roughing and finishing to mill and chamfer 58 teeth, and leaves a scale indicating the angle with the arched keyway on the first tooth or the 58th tooth or the first and 58th teeth; S4. Anticorrosion treatment: Electrophoretic paint; S5. Bonding magnetic steel: Apply glue to the bonding parts of the magnets on the rotor housing, place the magnets in the order of N and S poles, and glue them firmly.

[0031] First, the drawings of the rotor shell are designed. Then, wax mold manufacturing, shell mold, dewaxing, and shell firing are carried out in sequence according to the drawings. Then, casting, sand removal, oxide film removal, and shaping are carried out in sequence to obtain the rotor shell blank. Then, the rotor shell blank is transferred to the machining workshop for processing: the first sequence: CNC lathe rough and fine turning of the end face direction outer circle, end face groove, and rough turning of small holes; the second sequence: CNC lathe rough and fine turning of the large hole direction outer circle, taper hole, and fine turning of the magnetic steel pasting position; the third sequence: the machining center three-axis rough and fine milling of 12 internal ribs and 12 fan-shaped bottom holes; the fourth sequence: the machining center three-axis drilling and tapping of the end face of the rotor shell blank, 2 Use a 1mm drill bit to drill through the keyway position, and use a 1mm milling cutter to mill two holes; the fifth sequence: use the fourth sequence reserved hole to wire cut the arched keyway; the sixth sequence: use the four-axis machining center to rough and fine mill and chamfer 58 teeth, and leave an angle scale with the arched keyway on the 1st tooth or the 58th tooth or the 1st tooth and the 58th tooth; when processing 58 teeth, it is necessary to determine the position relationship between one or more teeth and the arched keyway, generally the angle relationship between the 1st tooth or the 58th tooth and the arched keyway, so that the position of each component inside the motor can be determined by the appearance position of the tooth, which is convenient for maintenance personnel to quickly find the fault location and improve efficiency.

[0032] Preferably, in the sixth order, in the arrangement sequence from the 1st tooth to the 58th tooth, the midline spacing angle between every two adjacent teeth is 6°, and the position between the 1st tooth and the 58th tooth is a stop position.

[0033] As a special position, the stop position can be used as a mark to distinguish the 1st tooth and the 58th tooth. Secondly, it can be used as a monitoring separation point or a stop blank point in a data acquisition device (sensor, such as a proximity sensor, a speed sensor, etc.).

[0034] Preferably, position identification holes are provided on two teeth on the diagonal line of the rotor housing.

[0035] It can be used as a mark to identify the 58 teeth.

[0036] Preferably, in S4, a sleeve is used to seal the tapered shaft hole and the magnetic steel position of the rotor housing to prevent them from absorbing paint. Example

[0037] Based on the above embodiments, this embodiment Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, an outer rotor motor for a UAV includes a rotor housing, and a data acquisition device adapted to 58 teeth is provided on the UAV.

[0038] When the rotor casing rotates, the 58 teeth on its outer circumference will pass through the data acquisition device (sensors, such as proximity sensors, speed sensors, etc.) in turn. The data acquisition device monitors the working data of the motor and promptly feeds back to the ground or the back end. First, it is used to promptly remind the ground drone of the various flight states, especially when a fault occurs, so that it can return and land in time to avoid flight accidents and losses. Second, the data sent back can be used to optimize the flight performance of the motor and the drone. Third, the 58 teeth are distributed in sequence, and the fault location can be determined at the first time according to their positional relationship with the various components inside the motor, thereby improving maintenance efficiency. Example

[0039] Based on the above embodiments, this embodiment Figure 6 As shown, the drone is provided with a stop device 1 adapted to the stop position. The stop device 1 comprises an electromagnetic telescopic rod 2, a horizontal plate 3, a brake plate 4 and a spring 5. The electromagnetic telescopic rod 2 is mounted on the drone, the horizontal plate 3 is mounted on the telescopic end of the electromagnetic telescopic rod 2, the brake plate 4 is mounted on the horizontal plate 3 through the spring 5, and a guide column 6 is provided between the brake plate 4 and the horizontal plate 3.

[0040] By using the cooperation of the stop device 1, the data acquisition device and the 58 teeth, and with the help of the control program, the rotation of the blades can be stopped in time when the UAV lands and returns, and then the stop positions of multiple blades can be controlled to ensure that multiple blades on the compact UAV do not interfere with each other. It also avoids the production cost caused by using sensors to control the blade positions and the high cost of remedial measures once the hardware is damaged.

[0041] Preferably, the width of the brake plate 4 is not less than the distance between two adjacent teeth and not greater than the width of the stop position.

[0042] The brake plate 4 is used to intervene in the stop position immediately after the UAV lands (before intervention, the brake plate 4 will not be interfered by the 58 teeth), stop the rotation of the blades in time, and then control the stop position of multiple blades to ensure that the multiple blades on the compact UAV do not interfere with each other.

[0043] Preferably, the width of the transverse plate 3 is greater than the width of the stop position.

[0044] Prevent the cross plate 3 from being interfered by the stop position.

[0045] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for machining a rotor housing of an outer rotor motor, characterized in that: The steps include: S1. Design the rotor housing of the motor; S2, obtaining a rotor housing blank by casting; S3, machining rotor housing blank: First order: CNC lathe rough and fine turning of the outer circle in the end face direction, end face groove and rough turning of small holes; Second order: CNC lathe rough and fine turning of the outer circle of the large hole direction, the tapered hole and fine turning of the magnetic steel pasting position; The third sequence: The machining center uses three axes to rough and fine mill the 12 internal ribs and 12 fan-shaped bottom holes; The fourth sequence: The three axes of the machining center drill and tap the end face of the rotor housing blank, drill through the keyway with a 2 mm drill bit, and mill two holes with a 1 mm milling cutter; Fifth order: wire cutting the arched keyway through the fourth order reserved hole; Sixth sequence: The machining center uses four-axis roughing and finishing to mill and chamfer 58 teeth, and leaves a scale indicating the angle with the arched keyway on the first tooth or the 58th tooth or the first and 58th teeth; S4. Anticorrosion treatment: Electrophoretic paint; S5. Bonding magnetic steel: Apply glue to the bonding parts of the magnets on the rotor housing, place the magnets in the order of N and S poles, and glue them firmly.

2. The method for machining the rotor housing of an outer rotor motor according to claim 1, characterized in that: The sixth sequence, in the arrangement order from the 1st tooth to the 58th tooth, has a center line spacing angle of 6° between every two adjacent teeth, and the position between the 1st tooth and the 58th tooth is a stop position.

3. The method for machining the rotor housing of an outer rotor motor according to claim 2, characterized in that: Position identification holes are arranged on two teeth on the diagonal line of the rotor housing.

4. The method for machining a rotor housing of an outer rotor motor according to claim 1, characterized in that: In S4, a sleeve is used to seal the tapered shaft hole and the magnetic steel position of the rotor housing to prevent them from being adsorbed and painted.

5. An outer rotor motor for a drone, characterized in that: The invention comprises a rotor housing as described in any one of claims 1 to 4, and a data acquisition device adapted to the 58 teeth is arranged on the drone.

6. The outer rotor motor for a drone according to claim 5, characterized in that: The drone is provided with a stop device (1) adapted to the stop position.

7. The outer rotor motor for a drone according to claim 6, characterized in that: The stopping device (1) comprises an electromagnetic telescopic rod (2), a transverse plate (3), a brake plate (4) and a spring (5); the electromagnetic telescopic rod (2) is mounted on the drone; the transverse plate (3) is mounted on the telescopic end of the electromagnetic telescopic rod (2); the brake plate (4) is mounted on the transverse plate (3) via the spring (5); and a guide column (6) is provided between the brake plate (4) and the transverse plate (3).

8. The outer rotor motor for a drone according to claim 7, characterized in that: The width of the brake plate (4) is not less than the distance between two adjacent teeth and is not greater than the width of the stop position.

9. The outer rotor motor for a drone according to claim 7, characterized in that: The width of the transverse plate (3) is greater than the width of the stop position.

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