A rotorless motor assembly, aircraft, and electrically powered device without a conductive slip ring

Abstract

This disclosure provides a statorless motor assembly, aircraft, and electrical device without conductive slip rings. The statorless motor assembly includes a housing, a shaft structure, a permanent magnet rotor, an armature rotor, a contactless power supply device, and a motor controller. The shaft structure includes at least an armature shaft, which rotates relative to the housing or is fixed within the housing. The permanent magnet rotor and the armature rotor are sleeved on the armature shaft, with the permanent magnet rotor rotating relative to the armature shaft and the armature rotor being fixed or rotating relative to the armature shaft. The contactless power supply system includes at least a stationary transmitter and a rotating receiver, both connected to the motor controller. The stationary transmitter is positioned at a relatively stationary position on the motor assembly, and the rotating receiver is positioned on the armature shaft or the armature rotor. This embodiment eliminates the need for conductive slip rings and brushes, resulting in smoother rotation and meeting the future development needs of electric aircraft for high power density, high efficiency, and long lifespan of the power motor.

Description

Technical Field

[0001] This disclosure relates to the technical field of electric motors, and more specifically, to a statorless motor assembly without conductive slip rings, an aircraft, and an electric device. Background Technology

[0002] A statorless motor, also known as a counter-rotating dual-rotor motor, uses bearings to suspend the stator of a traditional motor, forming a new rotor that works alongside the original rotor for dual-shaft output. A typical motor has a stator and a rotor, with only the rotor outputting torque. A statorless motor, by using bearings to transform the original stator into a new armature rotor, also outputs the counter-torque between the armature rotor and the original rotor to perform work. This doubles the total torque output of a traditional single-rotor motor. This means that, while maintaining constant electrical and magnetic loads and without changes in electromagnetic materials, the motor's torque density is doubled. This is of great significance for applications such as electric aircraft where motor weight is critical. However, since the armature of a statorless motor must be fed through conductive slip rings to rotate, this undoubtedly adds a brush that was originally eliminated by brushless motors. Although liquid metal brushes with almost no wear can be used, the armature windings of high-efficiency, high-power-density permanent magnet motors are usually three-phase windings. To power the rotating armature windings, at least three-pole conductive slip rings with extremely high current are required. However, actual liquid brush slip rings with two or more poles are relatively large and have significant frictional losses. Especially when the motor uses a permanent magnet brushless DC motor with a position sensor, multi-pole slip rings are needed to connect to the position sensor, which further increases the number of poles of the slip rings. The addition of conductive slip rings increases the size and weight of the motor and also introduces some energy loss. When using solid brushes, periodic replacement is also required due to brush wear. Summary of the Invention

[0003] The purpose of this disclosure is to provide a statorless motor assembly, aircraft, and electric device without conductive slip rings, in order to solve the aforementioned problems existing in the prior art.

[0004] To address the aforementioned technical problems, this disclosure provides a statorless motor assembly without conductive slip rings, comprising a housing, a shaft structure, a permanent magnet rotor, an armature rotor, a contactless power supply device, and a motor controller. The shaft structure includes at least an armature shaft, which rotates relative to the housing or is fixed within the housing. The permanent magnet rotor and the armature rotor are sleeved on the armature shaft, with the permanent magnet rotor rotating relative to the armature shaft and the armature rotor being fixed or rotating relative to the armature shaft. The contactless power supply system includes at least a stationary transmitter and a rotating receiver, both connected to the motor controller. The stationary transmitter is positioned at a relatively stationary position within the motor assembly, and the rotating receiver is positioned on the armature shaft or the armature rotor.

[0005] In some embodiments, the permanent magnet rotor includes an end cap disposed on the armature shaft, the end cap having a recess and the opening of the end cap facing the armature rotor; a magnet and a yoke are disposed on the outer edge of the end cap, the yoke being located on the opposite outer side of the end cap, and the magnet being located on the opposite inner side of the end cap and disposed opposite to the armature rotor.

[0006] In some embodiments, the armature rotor is located within the recess of the end cover, the armature rotor includes an armature core and an armature winding, the armature winding is wound axially on the armature core, and the armature winding is connected to the motor controller through winding leads.

[0007] In some embodiments, the stationary transmitter includes a transmitting core, a transmitting coil, a high-frequency oscillator, a power input line, and a control signal input line. The transmitting coil is disposed on the transmitting core, and the high-frequency oscillator is connected to the transmitting core via the high-frequency input line. The power input line is connected to an external battery, and the control signal input line is connected to an external flight control system.

[0008] In some embodiments, the rotating receiver includes a receiving coil, a receiving core, and a high-frequency rectifier circuit. The receiving coil is disposed on the receiving core, and the high-frequency rectifier circuit is connected to the motor controller or integrated with the motor controller.

[0009] In some embodiments, the transmitting core of the stationary transmitter and the receiving core of the rotating receiver are arranged opposite to each other and are capable of rotating relative to each other, with an axial or radial coupling air gap formed between the transmitting core and the receiving core.

[0010] In some embodiments, the transmitting core and the receiving core are C-shaped rotating bodies, the openings of the transmitting core and the receiving core are arranged opposite to each other, and / or the transmitting core and the receiving core are made of nickel-zinc-iron high-frequency soft magnetic material.

[0011] In some embodiments, the stationary transmitter further includes a modulation circuit, which includes at least an adder and a high-frequency signal generator. The high-frequency signal generator is a linear voltage-controlled oscillator that is frequency-modulated based on a speed control signal. The adder is used to attenuate the high-level voltage from the speed control signal and add it to a base modulation voltage to jointly control the voltage-controlled oscillator.

[0012] In some embodiments, the rotary receiver further includes a frequency detection circuit, an analog subtractor, and a linear amplifier. The frequency of the induced voltage of the receiving coil is obtained by the frequency detection circuit to obtain an output voltage. The output voltage is subtracted by the analog subtractor and then amplified to reproduce the speed control signal on the motor controller side.

[0013] In some embodiments, the shaft structure further includes a fixed base, the armature shaft is disposed within the fixed base and supported by the fixed base, at least partially located within the fixed base, and the armature shaft is capable of free rotation relative to the fixed base.

[0014] In some embodiments, the end cap is suspended on the armature shaft via a first bearing so that the permanent magnet rotor can rotate relative to the armature shaft, and the motor controller is disposed on the armature rotor and connected to the rotation receiver.

[0015] In some embodiments, the transmitting core of the stationary transmitter is disposed on the inner surface of the fixed base, and the receiving core of the rotating receiver is disposed on the outer surface of the armature shaft or on the armature rotor. The longitudinal sections of the transmitting core and the receiving core are C-shaped rotating bodies with openings facing outward and inward, respectively, and they are coaxially arranged opposite each other. The coupling air gap between the transmitting core and the receiving core is arranged axially.

[0016] In some embodiments, the end cap is suspended on the armature shaft by a first bearing so that the permanent magnet rotor can rotate relative to the armature shaft. The shaft structure also includes a rotating frame, which is mounted on the armature shaft by a second bearing. The armature rotor is mounted on the side surface of the rotating frame facing the end cap.

[0017] In some embodiments, the transmitting core is fixed to the armature shaft, the high-frequency oscillation generator is disposed near the outside of the housing, and the receiving core is disposed on the other side surface of the rotating frame away from the end cap.

[0018] This disclosure provides an aircraft including the aforementioned statorless motor assembly.

[0019] In some embodiments, a front propeller and a rear propeller are further included, wherein a rear propeller clamp for fixing the rear propeller is provided on the side of the end cap away from the armature rotor, and a front propeller clamp for fixing the front propeller is provided at the end of the armature shaft away from the armature rotor.

[0020] This disclosure provides an electric device including the statorless motor assembly described above.

[0021] Compared to traditional statorless counter-rotating dual-rotor motors, the embodiments disclosed herein eliminate the need for conductive slip rings and brushes, resulting in smoother rotation and meeting the high power density, high efficiency, and long lifespan requirements of future electric aircraft development. Specifically, the embodiments of this disclosure utilize very high frequency or ultra-high frequency electromagnetic induction between two relatively rotating iron cores to achieve contactless power transmission to the rotating motor controller, thereby realizing a statorless counter-rotating dual-rotor motor without conductive slip rings. Since this disclosure eliminates the sliding friction between the brushes and slip rings of conductive slip rings, the mechanical losses caused by conductive slip rings are eliminated, and the need for regular brush inspection and replacement is eliminated. The speed and lifespan limitations imposed by conductive slip rings on the motor are also removed. Furthermore, the use of very high frequency or ultra-high frequency transformers in this disclosure significantly reduces the size and weight of the transformer, resulting in a significantly smaller overall volume and weight of the motor assembly compared to traditional statorless motors using conductive slip rings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is one of the structural schematic diagrams of a statorless motor assembly without conductive slip rings according to an embodiment of the present disclosure;

[0024] Figure 2 This is a second schematic diagram of the structure of a statorless motor assembly without conductive slip rings according to an embodiment of this disclosure.

[0025] Figure label:

[0026] 1-Permanent magnet rotor; 2-Magnetic steel; 3-Magnetic yoke; 4-Armature rotor; 5-Armature core; 6-Armature winding; 7-Front propeller; 8-Front propeller clamp; 9-Rear propeller; 10-Rear propeller clamp; 11-First bearing; 12-Rotating frame; 13-Launching core; 14-Launching coil; 15-Receiver coil; 16-Receiver core; 17-High-frequency output wire; 18-Motor controller; 19-Winding lead; 20-High-frequency input line; 21-Armature shaft; 22-Fixed base; 23-High-frequency oscillation generator; 24-Power input line; 25-Control signal input line; 26-End cover; 27-Second bearing. Detailed Implementation

[0027] Various embodiments and features of this disclosure are described herein with reference to the accompanying drawings.

[0028] It should be understood that various modifications can be made to the embodiments described herein. Therefore, the above description should not be considered as limiting, but merely as an example of embodiments. Other modifications within the scope and spirit of this disclosure will be apparent to those skilled in the art.

[0029] The accompanying drawings, which are included in and form part of this specification, illustrate embodiments of the present disclosure and, together with the general description of the disclosure given above and the detailed description of the embodiments given below, serve to explain the principles of the disclosure.

[0030] These and other features of this disclosure will become apparent from the following description of preferred forms of embodiments given as non-limiting examples, with reference to the accompanying drawings.

[0031] It should also be understood that although this disclosure has been described with reference to some specific examples, those skilled in the art can certainly implement many other equivalent forms of this disclosure, which have the features described in the claims and are therefore all within the scope of protection defined herein.

[0032] The above and other aspects, features and advantages of this disclosure will become more apparent when taken in conjunction with the accompanying drawings and in view of the following detailed description.

[0033] Specific embodiments of this disclosure are described thereafter with reference to the accompanying drawings; however, it should be understood that the claimed embodiments are merely examples of this disclosure, which may be implemented in various ways. Well-known and / or repeated functions and structures are not described in detail to avoid unnecessary or redundant details that could obscure this disclosure. Therefore, the specific structural and functional details claimed herein are not intended to be limiting, but merely to serve as the basis and representative basis for the claims to teach those skilled in the art to use this disclosure in a variety of substantially any suitable detailed structures.

[0034] This specification may use the phrases “in one embodiment,” “in another embodiment,” “in yet another embodiment,” or “in still another embodiment,” all of which may refer to one or more of the same or different embodiments according to this disclosure.

[0035] like Figure 1 and Figure 2 As shown, Figure 1 and Figure 2 The structure of a statorless motor assembly without conductive slip rings is shown in this embodiment. The statorless motor assembly without conductive slip rings provided in this embodiment is used as a drive device in fields such as aircraft, for example, it can drive a propeller; the statorless motor assembly without conductive slip rings can also be used as a drive device in electric equipment such as vehicles.

[0036] The statorless motor assembly includes a housing, a shaft structure, a permanent magnet rotor 1, an armature rotor 4, a contactless power supply device, and a motor controller 18. The shaft structure includes at least an armature shaft 21, which can rotate relative to the housing or be fixedly installed inside the housing.

[0037] The permanent magnet rotor 1 and the armature rotor 4 are mounted on the armature shaft 21. The permanent magnet rotor 1 can rotate relative to the armature shaft 21, and the armature rotor 4 can be fixed or rotate relative to the armature shaft 21. For example, when the armature shaft 21 rotates relative to the housing, the permanent magnet rotor 1 can simultaneously rotate relative to the armature shaft 21, and the armature rotor 4 is fixed on the armature shaft 21 and rotates with the rotation of the armature shaft 21. When the armature shaft 21 is fixed relative to the housing, both the permanent magnet rotor 1 and the armature rotor 4 rotate relative to the armature shaft 21.

[0038] Furthermore, the permanent magnet rotor 1 includes an end cover 26, which is disposed on the armature shaft 21. The end cover 26 has a recess, and the opening of the end cover 26 faces the armature rotor 4. A magnet 2 and a yoke 3 are disposed on the outer edge of the end cover 26. The yoke 3 is located on the opposite outer side of the end cover 26, and the magnet 2 is located on the opposite inner side of the end cover 26 and is disposed opposite to the armature rotor 4.

[0039] Furthermore, in order to further reduce the axial dimension of the motor assembly, the armature rotor 4 is located in the recess of the end cover 26. The armature rotor 4 includes an armature core 5 and an armature winding 6, wherein the armature winding 6 is wound axially on the armature core 5, and the armature winding 6 is connected to the motor controller 18 through winding leads 19.

[0040] Furthermore, a rear propeller clamp 10 is provided on the side of the end cap 26 away from the armature rotor 4, and a front propeller clamp 8 is provided on the end of the armature shaft 21 away from the armature rotor 4. Here, the front propeller clamp 8 is used to fix the front propeller 8, and the rear propeller clamp 10 is used to fix the rear propeller 9.

[0041] Furthermore, the contactless power supply system includes at least a stationary transmitter and a rotating receiver, both of which are connected to the motor controller 18. The stationary transmitter is positioned at a relatively stationary location on the motor assembly and includes a transmitting core 13, a transmitting coil 14, a high-frequency oscillation generator 23, a power input line 24, and a control signal input line 25. The transmitting core 13 has a mounting slot, and the transmitting coil 14 is located within the mounting slot for fixation. In this embodiment, the speed control signal is a serial digital signal. The high-frequency oscillation generator 23 is connected to the transmitting core 13 via a high-frequency input line 20. The power input line 24 is connected to an external battery to provide power, and the control signal input line 25 is connected to an external flight control system to receive the speed control signal.

[0042] Furthermore, the rotating receiver includes a receiving coil 15, a receiving core 16, and a high-frequency rectifier circuit; wherein, the receiving core 16 is provided with a mounting groove, the receiving coil 15 is located in the mounting groove, and the receiving core 16 is connected to the motor controller 18 through a high-frequency output wire 17.

[0043] Furthermore, the transmitting core 13 of the stationary transmitter and the receiving core 16 of the rotating receiver are arranged opposite to each other, wherein the transmitting core 13 and the receiving core 16 do not contact each other but can rotate relative to each other. Specifically, the transmitting core 13 and the receiving core 16 can be C-shaped rotating bodies, and the openings of the transmitting core 13 and the receiving core 16 are arranged opposite to each other. The transmitting core 13 and the receiving core 16 are made of nickel-zinc-iron high-frequency soft magnetic material, and the axial or radial coupling air gap between the transmitting core 13 and the receiving core 16 should be less than 0.2 mm.

[0044] The high-frequency rectifier circuit mentioned here is connected to the motor controller 18. In some embodiments, it can be integrated with the motor controller 18, so that the output terminal of the high-frequency rectifier circuit can be used as the power input terminal of the motor controller 18, which makes it convenient for the signal output by the high-frequency rectifier circuit to be directly input to the motor controller 18.

[0045] Furthermore, the stationary transmitter also includes a modulation circuit, which includes at least an adder and a high-frequency signal generator. The high-frequency signal generator is a linear voltage-controlled oscillator that performs small-amplitude frequency modulation based on the speed control signal. Its rated output frequency is f0 = nV0, and its corresponding rated output voltage Vout is n times the basic modulation voltage V0. The adder attenuates the high-level voltage Vin from the speed control signal by a factor of m and adds it to the basic modulation voltage V0 to jointly control the linear voltage-controlled oscillator.

[0046] In this embodiment, the switching frequency output by the high-frequency signal generator is a frequency deviation f that is proportional to the speed control signal of the motor assembly, superimposed on the fundamental frequency f0. δ Where f0 corresponds to V0, and assuming m = 100n, the output frequency of the high-frequency signal generator is always between the fundamental frequency f0 and f0 + f δ Jumping between two frequencies, f0 and f0+f δ These correspond to 0 and 1 in a serial digital signal, respectively. Since m = 100n, f δ If the value is much smaller than f0, then the small change in the output frequency of the voltage-controlled oscillator has a negligible effect on the final output voltage of the rotating receiver.

[0047] Furthermore, the rotating receiver also includes a frequency detection circuit, an analog subtractor, and a linear amplifier, wherein the frequency of the induced voltage of the receiving coil 15 is output as a voltage V after frequency detection. out Always at V0 and V0+V δ The value fluctuates between two values, and V is obtained through the analog subtractor. out After the -V0 operation is performed and appropriately amplified, the 0 and 1 of the serial digital signal of the speed control signal can be obtained in real time, thereby reproducing the speed control signal of digital serial communication on the side of the motor controller 18.

[0048] In this embodiment, the high-frequency oscillation generator 23 converts the DC current from the external battery into a very high frequency current, such as 78MHz, and supplies it to the transmitting coil 14. The transmitting core 13 couples the high-frequency magnetic field generated by the transmitting coil 14 to the receiving core 16 through a 0.2mm air gap between the transmitting core 13 and the receiving core 16.

[0049] Furthermore, the high-frequency magnetic field received by the receiving core 16 induces a 78MHz high-frequency current in the receiving coil 15. After passing through the high-frequency rectifier circuit and filter circuit, the high-frequency current forms a direct current and is supplied to the motor controller 18 as the power source for the motor controller 18.

[0050] The speed control signal output by the external flight control system as an analog quantity is sent to the stationary transmitter. The modulation circuit in the stationary transmitter will slightly modulate the switching frequency of the high-frequency oscillator 23. After the high-frequency signal received by the receiving coil 15 is demodulated by the frequency detection circuit in the rotating receiver, the control signal can be obtained and transmitted to the motor controller 18, thereby realizing the control of the speed of the motor assembly.

[0051] In one specific implementation, such as Figure 1 As shown, in this embodiment, the armature shaft 21 can rotate relative to the housing, the armature rotor 4 is fixed relative to the armature shaft 21 and rotates with the rotation of the armature shaft 21, and the permanent magnet rotor 1 rotates relative to the armature shaft 21.

[0052] Specifically, the shaft structure further includes a fixed base 22, and the armature shaft 21 is disposed within the fixed base 22 and supported by the fixed base 22, with at least a portion of it located within the fixed base 22. Here, the armature shaft 21 is suspended within the fixed base 22 by bearings, and the armature shaft 21 can rotate freely relative to the fixed base 22.

[0053] In this embodiment, the end cap 26 of the permanent magnet rotor 1 is suspended on the armature shaft 21 via a first bearing 11, so that the permanent magnet rotor 1 can rotate relative to the armature shaft 21. Furthermore, in this embodiment, the motor controller 18 is mounted on the armature rotor 4 and connected to the stationary transmitter and the rotating receiver.

[0054] In this embodiment, the stationary transmitter and the rotating receiver are disposed within the fixed base 22 to utilize the space within the fixed base 22 for a reasonable arrangement of the stationary transmitter and the rotating receiver. The transmitting core 13 of the stationary transmitter is disposed on the inner surface of the fixed base 22, and the receiving core 16 of the rotating receiver is disposed on the outer surface of the armature shaft 21. The receiving core 16 can also be disposed on the armature rotor 4 (the armature rotor 4 rotates together with the armature shaft 21). The longitudinal sections of the transmitting core 13 and the receiving core 16 are C-shaped rotating bodies with openings facing outwards and inwards, respectively, and they are coaxially opposite each other. The coupling air gap between the transmitting core 13 and the receiving core 16 is arranged axially.

[0055] The embodiments disclosed herein enable an external DC power supply to transmit power to a motor controller via a high-frequency electromagnetic field emitted by a stationary transmitter of a contactless power supply system through a rotating receiver located very close to the transmitter, thus eliminating the need for a contact-type conductive slip ring. The external control signal is demodulated by a frequency detection circuit on the rotating receiver after frequency modulation with a small frequency offset of the oscillation frequency of the stationary transmitter, and then transmitted to the motor controller to control the motor speed.

[0056] In another implementation, such as Figure 2 As shown, the armature shaft 21 is fixed relative to the housing, and both the armature rotor 4 and the permanent magnet rotor 1 rotate relative to the armature shaft 21.

[0057] Specifically, the end cap 26 of the permanent magnet rotor 1 is suspended on the armature shaft 21 via the first bearing 11, so that the permanent magnet rotor 1 can rotate relative to the armature shaft 21.

[0058] The shaft structure also includes a rotating frame 12, which is mounted on the armature shaft 21 via a second bearing 27. The armature rotor 4 is mounted on the side surface of the rotating frame 12 facing the end cover 26, so that the armature rotor 4 can rotate relative to the fixed armature shaft 21.

[0059] In this embodiment, the transmitting core 13 of the stationary transmitter is fixed on the armature shaft 21, the high-frequency oscillation generator 23 is preferably located near the outside of the housing, the power input line 24 is connected to an external battery, and the control signal input line 25 is connected to an external flight control system; the receiving core 16 in the rotating receiver is located on the surface of the rotating frame 12 away from the end cover 26, or it can be located on the armature rotor 4 (the rotating frame 12 and the armature rotor 4 rotate together), and the output terminal of the high-frequency rectifier circuit is equivalent to the power input terminal of the motor controller 18.

[0060] The high-frequency oscillation generator 23 converts the DC current from the external battery into a 120MHz ultra-high frequency current and supplies it to the transmitting coil 14. The transmitting core 13 couples the high-frequency magnetic field generated by the transmitting coil 14 to the receiving core 16 through a 0.2mm air gap between the transmitting core 13 and the receiving core 16, so that the receiving coil 15 induces a 120MHz high-frequency current. After passing through the high-frequency rectifier circuit and the filter circuit, the high-frequency current becomes DC power and is supplied to the motor controller 18 as the power supply for the motor controller 18.

[0061] The analog signal output by the external flight control system, namely the speed control signal of the motor assembly, is sent to the stationary transmitter. The modulation circuit of the stationary transmitter will then slightly modulate the switching frequency output by the high-frequency oscillator 23. The frequency detection circuit in the rotating receiver demodulates the high-frequency signal received by the receiving coil 15 to obtain the control signal and transmit it to the motor controller 18 to control the speed of the motor assembly.

[0062] This disclosure also provides an aircraft including the aforementioned statorless motor assembly.

[0063] Furthermore, the aircraft also includes a front propeller and a rear propeller, wherein a rear propeller clamp for fixing the rear propeller is provided on the side of the end cap away from the armature rotor, and a front propeller clamp for fixing the front propeller is provided on the end of the armature shaft away from the armature rotor.

[0064] This disclosure also provides an electric device, including the statorless motor assembly described above, wherein the electric device may be, for example, an electric vehicle.

[0065] Compared to traditional statorless counter-rotating dual-rotor motors, the embodiments disclosed herein eliminate the need for conductive slip rings and brushes, resulting in smoother rotation and meeting the high power density, high efficiency, and long lifespan requirements of future electric aircraft development. Specifically, the embodiments of this disclosure utilize very high frequency or ultra-high frequency electromagnetic induction between two relatively rotating iron cores to achieve contactless power transmission to the rotating motor controller, thereby realizing a statorless counter-rotating dual-rotor motor without conductive slip rings. Since this disclosure eliminates the sliding friction between the brushes and slip rings of conductive slip rings, the mechanical losses caused by conductive slip rings are eliminated, and the need for regular brush inspection and replacement is eliminated. The speed and lifespan limitations imposed by conductive slip rings on the motor are also removed. Furthermore, the use of very high frequency or ultra-high frequency transformers in this disclosure significantly reduces the size and weight of the transformer, resulting in a significantly smaller overall volume and weight of the motor assembly compared to traditional statorless motors using conductive slip rings.

[0066] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0067] Furthermore, the features of the embodiments shown in the accompanying drawings or the various embodiments mentioned in this specification should not be construed as independent embodiments. Rather, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments not described in words or with reference to the accompanying drawings.

[0068] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A statorless motor assembly without conductive slip rings, characterized in that, The device includes a housing, a shaft structure, a permanent magnet rotor, an armature rotor, a contactless power supply device, and a motor controller. The shaft structure includes at least an armature shaft, which is rotatable relative to the housing or fixed within the housing. The permanent magnet rotor and the armature rotor are sleeved on the armature shaft, with the permanent magnet rotor rotating relative to the armature shaft and the armature rotor being fixed or rotating relative to the armature shaft. The contactless power supply system includes at least a stationary transmitter and a rotating receiver, both of which are connected to the motor controller. The stationary transmitter is positioned at a relatively stationary position on the motor assembly, and the rotating receiver is positioned on the armature shaft or the armature rotor.

2. The statorless motor assembly without conductive slip rings according to claim 1, characterized in that, The permanent magnet rotor includes an end cover disposed on the armature shaft. The end cover has a recess and its opening faces the armature rotor. A magnet and a yoke are disposed on the outer edge of the end cover. The yoke is located on the opposite outer side of the end cover, and the magnet is located on the opposite inner side of the end cover and is disposed opposite to the armature rotor.

3. The statorless motor assembly without conductive slip rings according to claim 2, characterized in that, The armature rotor is located in the recess of the end cover. The armature rotor includes an armature core and an armature winding. The armature winding is wound axially on the armature core and is connected to the motor controller through winding leads.

4. The statorless motor assembly without conductive slip rings according to claim 2, characterized in that, The stationary transmitter includes a transmitting core, a transmitting coil, a high-frequency oscillator, a power input line, and a control signal input line. The transmitting coil is mounted on the transmitting core, and the high-frequency oscillator is connected to the transmitting core via the high-frequency input line. The power input line is connected to an external battery, and the control signal input line is connected to an external flight control system.

5. The statorless motor assembly without conductive slip rings according to claim 4, characterized in that, The rotating receiver includes a receiving coil, a receiving core, and a high-frequency rectifier circuit. The receiving coil is disposed on the receiving core, and the high-frequency rectifier circuit is connected to the motor controller or is integrated with the motor controller.

6. The statorless motor assembly without conductive slip rings according to claim 5, characterized in that, The transmitting core of the stationary transmitter and the receiving core of the rotating receiver are arranged opposite to each other and can rotate relative to each other, with an axial or radial coupling air gap formed between the transmitting core and the receiving core.

7. The statorless motor assembly without conductive slip rings according to claim 6, characterized in that, The transmitting core and the receiving core are C-shaped rotating bodies, and the openings of the transmitting core and the receiving core are arranged opposite each other and / or the transmitting core and the receiving core are made of nickel-zinc-iron high-frequency soft magnetic material.

8. The statorless motor assembly without conductive slip rings according to claim 5, characterized in that, The stationary transmitter also includes a modulation circuit, which includes at least an adder and a high-frequency signal generator. The high-frequency signal generator is a linear voltage-controlled oscillator that is frequency-modulated based on the speed control signal. The adder is used to attenuate the high-level voltage from the speed control signal and add it to the base modulation voltage to jointly control the voltage-controlled oscillator.

9. The statorless motor assembly without conductive slip rings according to claim 5, characterized in that, The rotary receiver also includes a frequency detection circuit, an analog subtractor, and a linear amplifier. The frequency of the induced voltage of the receiving coil is obtained by the frequency detection circuit to obtain the output voltage. The output voltage is subtracted by the analog subtractor and then amplified to reproduce the speed control signal on the motor controller side.

10. The statorless motor assembly without conductive slip rings according to any one of claims 5-9, characterized in that, The shaft structure also includes a fixed base, the armature shaft is disposed in the fixed base and supported by the fixed base, at least partially located in the fixed base, and the armature shaft can rotate freely relative to the fixed base.

11. The statorless motor assembly without conductive slip rings according to claim 10, characterized in that, The end cap is suspended on the armature shaft via a first bearing so that the permanent magnet rotor can rotate relative to the armature shaft. The motor controller is mounted on the armature rotor and connected to the rotary receiver.

12. The statorless motor assembly without conductive slip rings according to claim 11, characterized in that, The transmitting core of the stationary transmitter is disposed on the inner surface of the fixed base, and the receiving core of the rotating receiver is disposed on the outer surface of the armature shaft or on the armature rotor. The longitudinal sections of the transmitting core and the receiving core are C-shaped rotating bodies with openings facing outward and inward, respectively, and are coaxially opposite to each other. The coupling air gap between the transmitting core and the receiving core is disposed along the axial direction.

13. The statorless motor assembly without conductive slip rings according to any one of claims 5-9, characterized in that, The end cap is suspended on the armature shaft by a first bearing so that the permanent magnet rotor can rotate relative to the armature shaft. The shaft structure also includes a rotating frame, which is mounted on the armature shaft by a second bearing. The armature rotor is mounted on the side surface of the rotating frame facing the end cap.

14. The statorless motor assembly without conductive slip rings according to claim 13, characterized in that, The transmitting core is fixed on the armature shaft, the high-frequency oscillation generator is located near the outside of the housing, and the receiving core is located on the other side surface of the rotating frame away from the end cover.

15. An aircraft, characterized in that, Includes the statorless motor assembly as described in claim 2.

16. The aircraft according to claim 15, characterized in that, It also includes a front propeller and a rear propeller, wherein a rear propeller clamp for fixing the rear propeller is provided on the side of the end cap away from the armature rotor, and a front propeller clamp for fixing the front propeller is provided on the end of the armature shaft away from the armature rotor.

17. An electric device, characterized in that, Includes the statorless motor assembly as described in claim 2.

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