A coaxial reverse axial flux motor for electric aircraft

Abstract

The present invention discloses a coaxial reverse axial flux motor for electric aircraft, including a reverse rotating rotor mechanism, a forward rotating rotor mechanism and a stator mechanism. The reverse rotating rotor mechanism and the forward rotating rotor mechanism of the present invention are both installed on the stator mechanism and are coaxial structures, which can achieve the requirements of motor reverse output and torque offset, and do not need to add additional torque offset devices on the body of the electric aircraft, which greatly improves the stability of the aircraft flight, simplifies the flight control of the aircraft structure, saves the power of the battery carried by the electric aircraft, and thus improves the comprehensive performance of the aircraft; the present invention adopts the axial flux working principle, which greatly increases the power density and torque-to-weight ratio of the motor and reduces the motor loss. The coaxial reverse axial flux motor of the present invention can be applied to large electric unmanned / manned aircraft.

Description

Technical Field

[0001] The invention relates to the technical field of brushless DC motors, in particular to a coaxial reverse axial flux motor for electric aircraft. Background Art

[0002] Currently, common electric aircraft, such as electric unmanned helicopters, electric autogyroplanes and other types of aircraft are basically powered by a single-axis motor + single propeller. The disadvantage is that the rotation of the single-axis motor + single propeller will produce a large reverse torque, which directly acts on the aircraft body and seriously affects the flight stability of the aircraft. In order to offset the large reverse torque generated by the rotation of the single-axis motor + single propeller, it is often necessary to add additional devices to the aircraft. For example, electric helicopters usually have a tail rotor at the tail of the helicopter to offset the aforementioned reverse torque. This not only greatly increases the cost and difficulty of aircraft design, production, and flight control, but also wastes extra power from the batteries carried on the aircraft.

[0003] In addition, the existing coaxial reversing motors for electric drones are mostly single-axis radial flux motors, and use a gear transmission structure to achieve reversing operation. They have a simple structure, low power density, and poor performance indicators. They are mostly used in model aircraft and cannot meet the use requirements of large unmanned / manned electric aircraft. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a coaxial reverse axial flux motor for electric aircraft, which solves the problem that electric flight using a single-axis motor + a single propeller in the past requires adding an additional torque compensation device to the fuselage, and meets the requirements of large electric unmanned / manned aircraft that the motors used must have high power density, high torque-to-weight ratio, and low motor loss.

[0005] The technical solution of the present invention is:

[0006] A coaxial reverse axial flux motor for an electric aircraft comprises a reverse rotating rotor mechanism, a forward rotating rotor mechanism and a stator mechanism;

[0007] The reverse rotating rotor mechanism comprises a motor housing, a reverse rotor upper cover fixed inside the motor housing, and a reverse rotor magnet fixed to the lower end surface of the reverse rotor upper cover and the inner bottom surface of the motor housing, wherein the reverse rotor upper cover divides the inside of the motor housing into a positive chamber and a negative chamber from top to bottom;

[0008] The forward rotating rotor mechanism comprises a forward rotor housing, a forward rotor magnet fixed on the inner top surface and the inner bottom surface of the forward rotor housing, and a forward rotating shaft with a forward output end extending out of the forward rotor housing. The forward rotor housing is placed in the positive chamber of the motor housing and does not contact the motor housing. The forward rotating shaft is fixedly connected to the forward rotor housing, and the forward output end of the forward rotating shaft extends out of the motor housing.

[0009] The stator mechanism includes a stator bracket, and a forward winding core and a reverse winding core which are mounted and fixed on the stator bracket. The top and bottom of the stator bracket are respectively connected to the motor housing through corresponding bearings, so as to realize the rotation of the reverse rotating rotor mechanism relative to the stator bracket. The forward winding core is located inside the forward rotor housing, and the forward winding core is not in contact with the forward rotor housing and the forward rotor magnet respectively. The forward rotating shaft penetrates into the stator bracket and the forward rotating shaft and the stator bracket are coaxial. A bearing is connected between the forward rotating shaft and the stator bracket, so as to realize the rotation of the forward rotating rotor mechanism relative to the stator bracket. The reverse winding core is located in the negative chamber, and the reverse winding core is not in contact with the motor housing and the reverse rotor magnet respectively.

[0010] Magnetic conductive plates are fixed on the lower end surface of the reverse rotor upper cover and the inner bottom surface of the motor housing, and on the inner top surface and inner bottom surface of the forward rotor housing. The reverse rotor magnetic steel and the forward rotor magnetic steel are fixed on the corresponding magnetic conductive plates.

[0011] The stator bracket is provided with a rotating shaft mounting hole which passes through from top to bottom. The forward rotating shaft penetrates into the rotating shaft mounting hole from top to bottom. Bearings are connected in the rotating shaft mounting hole of the stator bracket and adjacent to the bottom and top ends. The forward rotating shaft is connected and positioned with the stator bracket via two bearings. The forward output end of the forward rotating shaft extends upward to the outside of the motor housing.

[0012] The bottom end of the stator bracket extends out of the motor housing, and the bottom end of the stator bracket is fixedly connected to the motor fixing bracket.

[0013] A forward drive component fixing disk is fixedly connected to the forward output end of the forward rotating shaft.

[0014] The bottom end of the stator support is provided with a three-phase lead-out connector which is led out to the outside of the motor housing, and the winding of the forward winding core and the winding of the reverse winding core are both connected to the three-phase lead-out connector.

[0015] The stator bracket is provided with a cooling pipeline, and the bottom end of the stator bracket is provided with a water inlet pipe joint and a water outlet pipe joint respectively connected to the two ends of the cooling pipeline, and the water inlet pipe joint and the water outlet pipe joint both extend to the outside of the motor housing.

[0016] The motor housing and the forward rotor housing are both composed of an upper cover, a lower cover and a cover shell connected between the upper cover and the lower cover.

[0017] The forward winding core and the reverse winding core both include an integrally potted core winding fixing frame and a core winding. The core winding iron is fixed on the core winding fixing frame, and the core winding fixing frame is fixed on the stator bracket.

[0018] Advantages of the present invention:

[0019] The reverse rotating rotor mechanism and the forward rotating rotor mechanism of the present invention are both installed on the stator mechanism and are coaxial structures, which can achieve the requirements of motor reverse output and torque offset. There is no need to add additional torque offset devices on the body of the electric aircraft, which greatly improves the stability of the aircraft flight, simplifies the flight control of the aircraft structure, saves the power of the battery carried by the electric aircraft, and thus improves the overall performance of the aircraft; the present invention adopts the axial flux working principle, which greatly increases the power density and torque-to-weight ratio of the motor and reduces the motor loss. The coaxial reverse axial flux motor of the present invention can be applied to large electric unmanned / manned aircraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is the front view of the present invention.

[0021] Figure 2 It is a cross-sectional view of the present invention.

[0022] Figure 3 is a cross-sectional view of the counter-rotating rotor mechanism of the present invention.

[0023] Figure 4 It is a cross-sectional view of the forward rotating rotor mechanism of the present invention.

[0024] Figure 5 It is a structural schematic diagram of the stator mechanism of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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] See Figure 1-Figure 5 , a coaxial reverse axial flux motor for an electric aircraft, comprising a reverse rotating rotor mechanism, a forward rotating rotor mechanism and a stator mechanism;

[0027] The reverse-rotating rotor mechanism comprises a motor housing 1, a reverse-rotor upper cover 2 fixed inside the motor housing 1, and a reverse-rotor magnet 3 fixed on the lower end surface of the reverse-rotor upper cover 2 and the inner bottom surface of the motor housing 1. The reverse-rotor upper cover 2 divides the inside of the motor housing 1 into a positive chamber and a negative chamber from top to bottom. The top end of the motor housing 1 is used to fix and connect a reverse propeller or a reverse-rotating rotor.

[0028] The forward rotating rotor mechanism includes a forward rotor housing 4, a forward rotor magnet 5 fixed on the inner top surface and the inner bottom surface of the forward rotor housing 4, and a forward rotating shaft 6 whose forward output end passes through the outside of the forward rotor housing 4, the forward rotor housing 4 is placed in the positive chamber of the motor housing 1 and does not contact the motor housing 1, the forward rotating shaft 6 is fixedly connected to the forward rotor housing 4, the forward output end of the forward rotating shaft 6 extends upward to the outside of the motor housing 1, and a forward driving member fixing disk 7 is fixedly connected to the forward output end of the forward rotating shaft 6, and the forward driving member fixing disk 7 is used to be fixedly connected to a forward propeller or a forward rotating rotor;

[0029] The stator mechanism includes a stator bracket 8, and a forward winding core 9 and a reverse winding core 10 which are mounted and fixed on the stator bracket 8. The bottom end of the stator bracket 8 extends out of the motor housing 1. The top and bottom of the stator bracket 8 are respectively connected to the motor housing 1 through corresponding bearings 11, so as to realize the reverse rotation of the rotor mechanism relative to the stator bracket 8. The bottom end of the stator bracket 8 is fixedly connected to a motor fixing frame 12. The bottom end of the stator bracket 8 is provided with a three-phase lead-out wire connector 13 which is led out to the outside of the motor housing 1. The windings of the forward winding core 9 and the windings of the reverse winding core 10 are both connected to the three-phase lead-out wire connector 13. A cooling pipeline is provided on the stator bracket 8. The bottom end of the stator bracket 8 is provided with inlet terminals which are respectively connected to the two ends of the cooling pipeline. A water pipe joint 14 and a water outlet pipe joint 15, the forward winding core 9 is located inside the forward rotor housing 4, the forward winding core 4 does not contact the forward rotor housing 4 and the forward rotor magnet 5 respectively, a rotating shaft mounting hole is opened on the stator bracket 8 which passes through from top to bottom, the forward rotating shaft 6 penetrates into the rotating shaft mounting hole from top to bottom and the forward rotating shaft 6 and the stator bracket 8 are coaxial, bearings 11 are connected in the rotating shaft mounting hole of the stator bracket 8 and adjacent to the bottom and the top, the forward rotating shaft 6 is connected and positioned with the stator bracket 8 through two bearings, so as to realize the rotation of the forward rotating rotor mechanism relative to the stator bracket, the reverse winding core 10 is located in the negative chamber of the motor housing 1, the reverse winding core 10 does not contact the motor housing 1 and the reverse rotor magnet 3 respectively.

[0030] Among them, magnetic conductive plates 16 are fixed on the lower end surface of the reverse rotor upper cover 2 and the inner bottom surface of the motor housing 1, and on the inner top surface and inner bottom surface of the forward rotor housing 4. The reverse rotor magnetic steel 3 and the forward rotor magnetic steel 5 are fixed on the corresponding magnetic conductive plates 16 to achieve magnetic field conduction between the reverse rotor magnetic steels 3 or the forward rotor magnetic steels 5 on each positioning surface, and at the same time isolate the influence of the magnetic field of the magnetic steel on the outside world; the motor housing 1 and the forward rotor housing 4 are both composed of an upper cover, a lower cover and a cover shell connected between the upper cover and the lower cover, which is convenient for the assembly and connection of the reverse rotating rotor mechanism, the forward rotating rotor mechanism and the stator mechanism; the forward winding core 9 and the reverse winding core 10 both include an integrally encapsulated core winding fixing frame and a core winding, the core winding iron is fixed on the core winding fixing frame, and the core winding fixing frame is fixed on the stator bracket 8.

[0031] When in use, the forward winding core 9 and the reverse winding core 10 are powered on to respectively drive the reverse rotating rotor mechanism and the forward rotating rotor mechanism to perform coaxial reverse rotation around the stator support 8 .

[0032] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A coaxial reverse axial flux motor for an electric aircraft, characterized in that: It includes a reverse rotating rotor mechanism, a forward rotating rotor mechanism and a stator mechanism; The reverse rotating rotor mechanism comprises a motor housing, a reverse rotor upper cover fixed inside the motor housing, and a reverse rotor magnet fixed on the lower end surface of the reverse rotor upper cover and the inner bottom surface of the motor housing, wherein the reverse rotor upper cover divides the inside of the motor housing into a positive chamber and a negative chamber from top to bottom; magnetic conductive plates are fixed on the lower end surface of the reverse rotor upper cover and the inner bottom surface of the motor housing, and on the inner top surface and inner bottom surface of the forward rotor housing, and the reverse rotor magnet and the forward rotor magnet are fixed on the corresponding magnetic conductive plates; The forward rotating rotor mechanism comprises a forward rotor housing, a forward rotor magnet fixed on the inner top surface and the inner bottom surface of the forward rotor housing, and a forward rotating shaft with a forward output end extending out of the forward rotor housing. The forward rotor housing is placed in the positive chamber of the motor housing and does not contact the motor housing. The forward rotating shaft is fixedly connected to the forward rotor housing, and the forward output end of the forward rotating shaft extends out of the motor housing. A forward driving member fixing disk is fixedly connected to the forward output end of the forward rotating shaft. The stator mechanism includes a stator bracket, and a forward winding core and a reverse winding core which are mounted and fixed on the stator bracket. The top and bottom of the stator bracket are respectively connected to the motor housing through corresponding bearings, so as to realize the rotation of the reverse rotating rotor mechanism relative to the stator bracket. The forward winding core is located inside the forward rotor housing, and the forward winding core is not in contact with the forward rotor housing and the forward rotor magnet respectively. The forward rotating shaft penetrates into the stator bracket and the forward rotating shaft and the stator bracket are coaxial. A bearing is connected between the forward rotating shaft and the stator bracket, so as to realize the rotation of the forward rotating rotor mechanism relative to the stator bracket. The reverse winding core is located in the negative chamber, and the reverse winding core is not in contact with the motor housing and the reverse rotor magnet respectively.

2. A coaxial reverse axial flux motor for electric aircraft according to claim 1, characterized in that: The stator bracket is provided with a rotating shaft mounting hole which passes through from top to bottom. The forward rotating shaft penetrates into the rotating shaft mounting hole from top to bottom. Bearings are connected in the rotating shaft mounting hole of the stator bracket and adjacent to the bottom and top ends. The forward rotating shaft is connected and positioned with the stator bracket via two bearings. The forward output end of the forward rotating shaft extends upward to the outside of the motor housing.

3. A coaxial reverse axial flux motor for electric aircraft according to claim 1, characterized in that: The bottom end of the stator bracket extends out of the motor housing, and the bottom end of the stator bracket is fixedly connected to the motor fixing bracket.

4. A coaxial reverse axial flux motor for electric aircraft according to claim 1, characterized in that: The bottom end of the stator support is provided with a three-phase lead-out connector which is led out to the outside of the motor housing, and the winding of the forward winding core and the winding of the reverse winding core are both connected to the three-phase lead-out connector.

5. A coaxial reverse axial flux motor for electric aircraft according to claim 1, characterized in that: The stator bracket is provided with a cooling pipeline, and the bottom end of the stator bracket is provided with a water inlet pipe joint and a water outlet pipe joint respectively connected to the two ends of the cooling pipeline, and the water inlet pipe joint and the water outlet pipe joint both extend to the outside of the motor housing.

6. A coaxial reverse axial flux motor for electric aircraft according to claim 1, characterized in that: The motor housing and the forward rotor housing are both composed of an upper cover, a lower cover and a cover shell connected between the upper cover and the lower cover.

7. A coaxial reverse axial flux motor for electric aircraft according to claim 1, characterized in that: The forward winding core and the reverse winding core both include an integrally potted core winding fixing frame and a core winding. The core winding iron is fixed on the core winding fixing frame, and the core winding fixing frame is fixed on the stator bracket.

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