Resolver, motor, electric drive system, and electric device

Abstract

The present application is applicable to the technical field of measurement, and provides a resolver (100), a motor (1000), an electric drive system, and an electric device. The resolver (100) comprises a fixed portion (10) and a rotating portion (20). The fixed portion (10) comprises fixed magnetic cores (11) and fixed windings (12); the rotating portion (20) comprises rotating magnetic cores (22) and rotating windings (21); the fixed magnetic cores (11) are fitted to the rotating magnetic cores (22), and the fixed magnetic cores (11) and the rotating magnetic cores (22) define magnetic core windows (40); at least part of each rotating winding (21) is provided in the corresponding magnetic core window (40); the rotating magnetic cores (22) can rotate relative to the fixed magnetic cores (11), and are spaced apart from the fixed magnetic cores (11) in a radial direction (Y) to form air gaps (30); and each air gap (30) is communicated with two opposite ends of the corresponding magnetic core window (40) in an axial direction (X). In this way, the fluctuation of the inductance of the resolver (100) is small, thereby reducing the sensitivity of the resolver (100) to movement in the axial direction (X).

Description

Rotary transformer, motor, electric drive system and electric device

[0001] Cross-reference to related applications

[0002] This application claims priority to the Chinese patent application No. 202410438334.0, filed on April 11, 2024, entitled "Rotary transformer, motor, electric drive system and electric device", the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of measurement, in particular to a rotary transformer, a motor, an electric drive system and an electric device. BACKGROUND

[0004] In the related art, the rotary transformer can include a fixed part and a rotating part, and the rotating part is arranged to be rotatable relative to the fixed part.

[0005] During the rotation of the rotating part relative to the fixed part, the rotating part has a risk of axial movement relative to the fixed part, and the rotary transformer has high sensitivity to the axial movement of the rotating part, which affects the inductance of the rotary transformer, thereby causing large fluctuations. In this way, during the operation of the rotary transformer, the rotation stability of the rotary transformer is poor, which affects the measurement accuracy of the rotary transformer. SUMMARY

[0006] In view of the above problems, the purpose of the embodiments of the present application is to provide a rotary transformer, a motor, an electric drive system and an electric device, which can reduce the sensitivity of the rotary transformer to axial movement.

[0007] The technical solution adopted by the embodiments of the present application is:

[0008] In a first aspect, the embodiments of the present application provide a rotary transformer, comprising:

[0009] The fixed part includes a fixed magnetic core and a fixed winding connected to the fixed magnetic core.

[0010] The rotating part includes a rotating magnetic core and a rotating winding connected to the rotating magnetic core. The fixed magnetic core is sleeved on the outer periphery of the rotating magnetic core, and forms a magnetic core window together with the rotating magnetic core. At least part of the rotating winding is arranged in the magnetic core window. The rotating magnetic core is rotatable relative to the fixed magnetic core, and forms an air gap along the radial direction with the fixed magnetic core. The air gap is communicated with the opposite ends of the magnetic core window along the axial direction.

[0011] The rotating transformer provided by the embodiment of the application forms the air gap in the radial direction by the fixed magnetic core and the rotating magnetic core, and the air gap is communicated with the opposite ends of the magnetic core window in the axial direction, so that the dimension of the air gap in the radial direction does not change when the rotating part moves in the axial direction relative to the fixed part, which makes the main magnetic circuit of the fixed magnetic core and the rotating magnetic core basically unchanged, thereby reducing the inductance fluctuation of the rotating transformer, reducing the sensitivity of the rotating transformer to the axial movement of the rotating part, improving the rotation stability of the rotating transformer, and improving the measurement accuracy of the rotating transformer.

[0012] In some embodiments, the fixed magnetic core is provided with a first end portion and a second end portion at the opposite ends of the magnetic core window in the axial direction, and the air gap is formed in the radial direction between the first end portion and the rotating magnetic core and between the second end portion and the rotating magnetic core.

[0013] In this way, the sensitivity of the rotating transformer to the axial movement is reduced, the rotation stability of the rotating transformer is improved, and the measurement accuracy of the rotating transformer is improved. In addition, the size of the rotating magnetic core in the radial direction is reduced, so that the volume and weight of the rotating magnetic core are reduced, and the rotating magnetic core can be adapted to high-speed rotation occasions, so that the rotating transformer can be applied to high-speed rotation occasions.

[0014] In some embodiments, in the axial direction, the opposite ends of the rotating magnetic core protrude out of the fixed magnetic core;

[0015] Alternatively, in the axial direction, the opposite ends of the fixed magnetic core protrude out of the rotating magnetic core.

[0016] In this way, the fluctuation of the inductance can be further reduced to further reduce the sensitivity of the rotating transformer to the axial movement.

[0017] In some embodiments, the rotating winding is a planar winding.

[0018] In this way, on the one hand, the rotating winding and the fixed winding are beneficial to be arranged in the magnetic core window, so as to improve the space utilization of the magnetic core window and help to realize the miniaturization and lightweight design of the rotating transformer. On the other hand, the rotating winding is beneficial to be away from the air gap, so that the influence of the spatial harmonic magnetic field at the air gap on the rotating winding can be improved, the eddy current loss caused by the spatial harmonic magnetic field on the rotating winding is reduced, the rotation stability of the rotating transformer is improved, and the measurement accuracy of the rotating transformer is improved.

[0019] In some embodiments, the rotating winding and the fixed winding are arranged in the axial direction.

[0020] In this way, on the one hand, the rotating winding is away from the air gap, so that the influence of the spatial harmonic magnetic field at the air gap on the rotating winding can be improved, so as to reduce the eddy current loss caused by the spatial harmonic magnetic field on the rotating winding, improve the rotation stability of the rotary transformer, and improve the measurement accuracy of the rotary transformer. On the other hand, the rotating winding and the fixed winding can be close to each other along the axial direction, so as to improve the electromagnetic coupling coefficient between the rotating winding and the fixed winding, thereby reducing the loss of the rotating winding, improving the rotation stability of the rotary transformer, and improving the measurement accuracy of the rotary transformer.

[0021] In some embodiments, the number of fixed windings is multiple, and the rotating winding is provided with fixed windings on opposite sides along the axial direction.

[0022] In this way, the coupling coefficient between the rotating winding and the fixed winding can be improved, so that the loss of the rotating winding can be reduced, the rotation stability of the rotary transformer can be improved, and the measurement accuracy of the rotary transformer can be improved.

[0023] In some embodiments, the outer peripheral wall of the rotating magnetic core extends linearly along the axial direction.

[0024] In this way, the rotating magnetic core can be miniaturized and lightened. Based on this, the rotating magnetic core can rotate at high speed, that is, the rotary transformer can be applied to high-speed rotating occasions.

[0025] In some embodiments, the rotating magnetic core includes a plurality of first magnetic cores; at least part of the first magnetic cores are distributed on the rotating winding along the circumferential direction, and / or at least part of the first magnetic cores are distributed on the rotating winding along the axial direction, and / or at least part of the first magnetic cores are distributed on the rotating winding along the radial direction.

[0026] By adopting the above technical solution, a plurality of first magnetic cores are distributed on the rotating winding to form the rotating magnetic core. In this way, the weight of the rotating magnetic core can be reduced, so that the rotary transformer can be applied to high-speed rotating occasions.

[0027] In some embodiments, the rotating winding is provided with a first limiting groove, and the rotating magnetic core is radially limited in the first limiting groove.

[0028] By radially limiting the rotating magnetic core through the first limiting groove, the first limiting groove can resist the centrifugal force in the rotation process of the rotating magnetic core, so as to improve the stability of the rotating part in the rotation process, and the rotary transformer can be applied to high-speed rotating occasions.

[0029] In some embodiments, the rotating winding is provided with a plurality of first limiting grooves, and at least part of the first limiting grooves are distributed along the circumferential direction at intervals; the rotating magnetic core includes a plurality of first magnetic cores, and the first magnetic cores are respectively radially and circumferentially limited in the corresponding first limiting grooves.

[0030] By adopting the technical scheme, on one hand, the first magnetic core is limited in the corresponding first limiting groove, and the first limiting grooves are distributed along the circumference, so that the first magnetic cores are arranged at intervals, which helps to reduce the weight of the rotating magnetic core, and helps the rotating magnetic core to be applied to a high-speed rotating occasion, so that the rotary transformer can be applied to the high-speed rotating occasion. On the other hand, the first magnetic core is limited in the first limiting groove along the radial direction and the circumferential direction, respectively, so that the rotating magnetic core can be stably installed on the rotating winding, and the problem of the rotating magnetic core being thrown out due to a large centrifugal rate during high-speed rotation is improved, and the stability of the high-speed rotation of the rotary transformer is improved.

[0031] In some embodiments, the rotating winding includes an intermediate portion, a connecting portion, and an annular portion, the annular portion surrounds the outer periphery of the intermediate portion and is distributed at intervals with the intermediate portion; the connecting portion is connected between the annular portion and the intermediate portion, the number of the connecting portions is multiple, and the connecting portions are distributed at intervals along the circumference, and the annular portion, the intermediate portion, and the two adjacent connecting portions form the first limiting groove.

[0032] In this way, the first magnetic core can be limited between the annular portion and the intermediate portion along the radial direction, and between the two adjacent connecting portions along the circumferential direction, so that the rotating magnetic core is limited along the circumferential and radial directions on the rotating winding.

[0033] In some embodiments, the rotating part further includes a rotating shaft structure, and the rotating magnetic core is installed on the rotating winding through the rotating shaft structure.

[0034] The rotating magnetic core is installed on the rotating winding through the rotating shaft structure, so that the rotating magnetic core does not need to be additionally designed to install and limit the rotating winding. In this way, the structure of the rotating magnetic core can be very simple and small, the weight of the rotating magnetic core can be reduced, and the rotating magnetic core can rotate at high speed relative to the fixed magnetic core, so that the rotary transformer can be applied to high-speed rotating occasions.

[0035] In some embodiments, the rotating shaft structure is installed on the rotating winding, and the rotating shaft structure includes a first limiting portion and a second limiting portion, the first limiting portion and the second limiting portion are respectively arranged on opposite sides of the rotating winding along the axial direction, and the rotating magnetic core includes a first magnetic core.

[0036] The first magnetic core passes through the rotating winding along the axial direction and is limited between the first limiting portion and the second limiting portion along the axial direction; and / or, the rotating winding is provided with the first magnetic core on opposite sides thereof along the axial direction, and the first limiting portion and the second limiting portion limit the corresponding first magnetic core on the rotating winding along the axial direction.

[0037] In this way, the rotating shaft structure can install the rotating magnetic core on the rotating winding, so that the rotating magnetic core is limited on the rotating winding at least along the axial direction.

[0038] In some embodiments, the rotating shaft structure comprises a first rotating shaft and a second rotating shaft, the first rotating shaft comprises a first shaft body and a first limiting part connected to the first shaft body, and the second rotating shaft comprises a second shaft body and a second limiting part connected to the second shaft body; the first shaft body and the second shaft body are connected to each other to be mounted on the rotating winding.

[0039] In this way, the rotating shaft structure is convenient for mounting the rotating magnetic core on the rotating winding.

[0040] In some embodiments, the rotating shaft structure further comprises a third limiting part.

[0041] The third limiting part and the first limiting part, and / or the third limiting part and the second limiting part, form a second limiting groove therebetween, and the first magnetic core is circumferentially limited in the second limiting groove.

[0042] In this way, the rotating shaft structure can also limit the rotating magnetic core in the circumferential direction, so as to realize stable mounting of the rotating part, and facilitate application of the rotating part in high-speed rotating occasions.

[0043] In some embodiments, the fixed magnetic core comprises a plurality of second magnetic cores; at least part of the second magnetic cores are arranged in the circumferential direction, and / or at least part of the second magnetic cores are arranged in the axial direction, and / or at least part of the second magnetic cores are arranged in the radial direction.

[0044] By adopting the above technical solution, the fixed magnetic core can be divided into a plurality of second magnetic cores, which helps to reduce the weight of the fixed magnetic core, so as to realize lightweight design of the rotary transformer.

[0045] In a second aspect, the embodiments of the present application provide an electric machine.

[0046] The electric machine provided by the embodiments of the present application adopts the rotary transformer as described above, so that the inductance of the rotary transformer is less sensitive to axial movement, thereby improving the rotation stability of the rotary transformer and improving the measurement accuracy of the rotary transformer, so as to accurately control the operation of the electric machine.

[0047] In a third aspect, the embodiments of the present application provide an electric drive system, comprising an electric machine and a rotary transformer, and the rotor of the electric machine is fixedly connected to the rotating part.

[0048] The electric drive system provided by the embodiments of the present application adopts the rotary transformer as described above, so that the electric drive system can stably and efficiently output power.

[0049] In a fourth aspect, the embodiments of the present application provide an electric device, comprising a rotary transformer, an electric machine or an electric drive system.

[0050] The electric device provided by the embodiments of the present application can stably and efficiently output power by using the resolver, the motor or the electric drive system.

[0051] The above description is only a summary of the technical solutions of the present application. In order to make the technical means of the present application more clear and understandable, the embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described below. BRIEF DESCRIPTION OF DRAWINGS

[0052] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0053] Fig. 1 is a schematic diagram of a vehicle provided by some embodiments of the present application;

[0054] Fig. 2 is a partial schematic diagram of a motor provided by some embodiments of the present application;

[0055] Fig. 3 is a partial schematic diagram of a motor provided by some other embodiments of the present application;

[0056] Fig. 4 is a partial schematic diagram of a motor provided by some other embodiments of the present application;

[0057] Fig. 5 is a partial schematic diagram of a motor provided by some other embodiments of the present application;

[0058] Fig. 6 is a partial schematic diagram of a motor provided by some other embodiments of the present application;

[0059] Fig. 7 is a structural schematic diagram of a resolver provided by some embodiments of the present application;

[0060] Fig. 8 is an exploded schematic diagram of Fig. 7;

[0061] Fig. 9 is a sectional view of Fig. 7 along A-A;

[0062] Fig. 10 is an enlarged view of B in Fig. 9;

[0063] Fig. 11 is a sectional view of a resolver provided by some other embodiments of the present application;

[0064] Fig. 12 is a sectional view of a resolver provided by some other embodiments of the present application;

[0065] Fig. 13 is a sectional view of a resolver provided by some other embodiments of the present application;

[0066] FIG14 is a schematic diagram of the rotating portion of the rotary transformer provided in FIG7 ;

[0067] FIG15 is an exploded schematic diagram of FIG14;

[0068] FIG16 is an exploded schematic diagram of a rotary transformer provided in some other embodiments of the present application;

[0069] FIG17 is a simulation diagram of a rotary transformer provided in some embodiments of the present application;

[0070] FIG18 is a simulation schematic diagram of the rotary transformer of Comparative Example 1.

[0071] Among them, the reference numerals in the figure are: 1000-motor; 2000-battery; 3000-control system; 4000-gearbox; 100-rotor transformer; 200-rotor; 300-stator; 400-motor shaft; 10-fixed part; 101-first end face; 102-second end face; 11-fixed magnetic core; 111-second magnetic core; 1111-first end portion; 1112-second end portion; 1113-first peripheral portion; 1114-second peripheral portion; 12-fixed winding; 20-rotating part; 201-first limiting groove; 202-second limiting groove; 203-third end face; 21-rotating winding; 211-middle portion; 212-annular portion ;213-connecting part;22-rotating magnetic core;221-first magnetic core;23-rotating shaft structure;231-first rotating shaft;2311-first shaft body;2312-first limiting part;2313-third limiting part;232-second rotating shaft;2321-second shaft body;2322-second limiting part;30-air gap;30a-first air gap;30b-second air gap;40-core window;L-center axis;X-axial direction;Y-radial direction;Z-circumferential direction. DETAILED DESCRIPTION

[0072] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0073] In the description of this application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0074] In addition, the terms "first", "second", etc. are used only for the purpose of description, and should not be understood as indicating or implying relative importance or implying the number of the technical features indicated. Therefore, the features defined as "first", "second", etc. can explicitly or implicitly include one or more of the features.

[0075] In the description of the present application, the meaning of "a plurality of" is more than two, and "more than two" includes two, unless otherwise explicitly specified and limited. Accordingly, the meaning of "a plurality of groups" is more than two groups, including two groups.

[0076] In the description of the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0077] In the description of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B, which can represent: A exists, A and B exist, and B exists. In addition, in the present application, the character " / ", generally represents that the front and rear associated objects are in an "or" relationship.

[0078] Although the present application has been described with reference to the preferred embodiments, various improvements can be made and parts thereof can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

[0079] In the related art, the resolver is an electromagnetic sensor, also known as a synchronous resolver. It is a small AC motor used to measure the angular displacement and angular velocity of a rotating object.

[0080] The resolver can generally include a fixed part and a rotating part, the rotating part being arranged to be rotatable relative to the fixed part. Specifically, the fixed part includes a fixed winding, and the rotating part includes a rotating winding, the rotating winding being arranged to be rotatable relative to the fixed winding.

[0081] During the rotation of the rotating part relative to the fixed part, the rotating part is at risk of axial movement relative to the fixed part, and the rotating transformer is highly sensitive to the axial movement of the rotating part, so that the inductance of the rotating transformer is affected, thereby generating a large fluctuation. Thus, during the operation of the rotating transformer, the rotating stability of the rotating transformer is poor, which affects the accuracy of the measurement and output data of the rotating transformer.

[0082] Based on the above considerations, the embodiments of the present application provide a rotating transformer, a motor, an electric drive system and an electric device. By arranging the fixed magnetic core and the rotating magnetic core, and the fixed magnetic core and the rotating magnetic core are spaced apart along the radial direction to form an air gap, the air gap is respectively communicated to the opposite ends of the magnetic core window along the axial direction, so that when the rotating part moves axially relative to the fixed part, the size of the air gap along the radial direction does not change, which makes the main magnetic circuit of the fixed magnetic core and the rotating magnetic core basically unchanged, thereby reducing the inductance fluctuation of the rotating transformer, reducing the sensitivity of the rotating transformer to the axial movement of the rotating part, and helping to improve the rotating stability of the rotating transformer, thereby improving the measurement accuracy of the rotating transformer.

[0083] It should be noted here that the air gap refers to the spacing between the fixed part and the rotating part for the rotation of the rotating part relative to the fixed part. That is, due to the existence of the air gap, the rotating part can rotate relative to the fixed part without interference.

[0084] In some embodiments, the rotating transformer can be applied to an electric device.

[0085] The electric device can be, but is not limited to, an electric toy, an electric tool, an electric bicycle, an electric motorcycle, a ship, a spacecraft, etc. The electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles and spacecraft, etc.

[0086] The electric device can also be a vehicle, and can also be a vehicle chassis. According to the power source, the vehicle can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or a range extender car, etc. According to the driving mode, the vehicle can be a front drive car, a rear drive car or a four-wheel drive car.

[0087] For convenience of description, some embodiments of the present application take the electric device as a vehicle for example.

[0088] Please refer to FIG. 1, which is a schematic diagram of a vehicle according to some embodiments of the present application. The vehicle is provided with an electric drive system, which can be arranged at the bottom, head or tail of the vehicle to provide power for the vehicle. That is, the vehicle includes an electric drive system.

[0089] The vehicle has a machine cabin and a passenger cabin. The machine cabin is used to accommodate the electric drive system of the vehicle, and the passenger cabin is used to provide an operating space and a seating space for the driver. When the vehicle is a front drive car, the machine cabin is arranged at the head of the vehicle, i.e. the machine cabin is a front machine cabin. When the vehicle is a rear drive car, the machine cabin is arranged at the tail of the vehicle, i.e. the machine cabin is a rear machine cabin. When the vehicle is a four-wheel drive car, the machine cabin is divided into a front machine cabin and a rear machine cabin, the front machine cabin is arranged at the head of the vehicle, and the rear machine cabin is arranged at the tail of the vehicle. The passenger cabin is arranged between the head and the tail of the vehicle.

[0090] The electric drive system is the power system of the vehicle, i.e. the electric drive system of the vehicle, which is used to convert electrical energy into mechanical energy to drive the vehicle to start, navigate, travel and meet the working power demand during travel.

[0091] In some embodiments, part of the electric drive system can be arranged in the machine cabin, and the other part can be arranged at the bottom of the vehicle.

[0092] In some embodiments, the electric drive system can include an electric motor 1000, which is used as a power source of the electric drive system. It can be understood that the electric drive system is not limited to be applied in the vehicle, but can also be applied in other electric devices requiring power output.

[0093] In some embodiments, the electric drive system can further include a battery 2000, which is used to supply power to the electric motor 1000, for example, to meet the working power demand of the vehicle during starting, navigation and travel.

[0094] In some embodiments, the electric drive system can further include a control system 3000, which is used to control the operation of the electric drive system. Specifically, the control system 3000 is electrically connected to the battery 2000, and the control system 3000 can be used to convert the direct current provided by the battery 2000 into alternating current and output the alternating current to the electric motor 1000, so as to control the operation of the electric motor 1000, thereby achieving the driving control of the vehicle. For example, the control system 3000 can control the start, speed change and stop of the electric motor 1000, so as to drive the vehicle to start, change speed and stop, etc.

[0095] The control system 3000 can also be used to convert alternating current into direct current, for example, during the kinetic energy recovery of the vehicle, the electric motor 1000 can convert the mechanical energy driving it to rotate into alternating current, and the control system 3000 can convert the alternating current into direct current and charge it into the battery 2000.

[0096] In some embodiments, the electric drive system can further comprise a gearbox 4000 connected with the motor 1000 to realize torque change of the motor 1000. The gearbox 4000, also known as a transmission, is a mechanism used to change the speed and torque of the rotation from the engine, which can fix or step change the transmission ratio of the output shaft and the input shaft.

[0097] In some embodiments, the battery 2000 can be integrated with the motor 1000 to form the electric drive system. The control system 3000 can also be integrated with the motor 1000 to form the electric drive system. The gearbox 4000, the control system 3000 and the motor 1000 can also be integrated to form the electric drive system. The gearbox 4000, the control system 3000, the battery 2000 and the motor 1000 can also be integrated to form the electric drive system. Of course, in some embodiments, the electric drive system can also integrate other structures, such as a cooling oil circuit, etc.

[0098] Please refer to FIG. 2 to FIG. 6, which respectively show the structural schematic diagram of the motor 1000 provided by the embodiments of the present application. The motor 1000, also known as an electric motor, is a device that converts electrical energy into mechanical energy. The motor 1000 can comprise a rotor 200, a stator 300 and a motor shaft 400. Specifically, the motor 1000 generates a rotating magnetic field by the energized coil of the stator 300 and acts on the rotor 200 to form a magnetic electric power rotating torque. The fixed part in the motor 1000 is called the stator 300; while the rotating part in the motor 1000 is called the rotor 200.

[0099] It needs to be explained here that the motor 1000 has an axial direction X, a circumferential direction Z and a radial direction Y. The axial direction X of the motor 1000 refers to the axial direction X of the rotor 200, that is, the axial direction X of the motor shaft 400, that is, the direction of the central axis of the motor shaft 400. The radial direction Y of the motor 1000 refers to the radial direction Y of the rotor 200, that is, the radial direction Y of the motor shaft 400, that is, the radius direction of the motor shaft 400. The circumferential direction Z of the motor 1000 refers to the circumferential direction Z of the rotor 200, that is, the circumferential direction Z of the motor shaft 400, that is, the circumferential direction of the motor shaft 400.

[0100] The motor shaft 400 refers to the shaft-like structure in the motor 1000 used to output power. The rotor 200 is fixedly connected with the motor shaft 400, so that the motor shaft 400 can rotate under the driving of the rotor 200 to output power.

[0101] The stator 300 is sleeved on the outer periphery of the motor shaft 400, and the stator 300 and the motor shaft 400 can rotate relative to each other, so that the stator 300 and the rotor 200 can rotate relative to each other. In some embodiments, the stator 300 can be supported on the motor shaft 400 by a bearing.

[0102] The energized coil on the stator 300 can generate a magnetic field when energized, and act on the rotor 200 to form a magnetic electric power rotation torque, so as to realize the rotation of the rotor 200, and then drive the motor shaft 400 to rotate together, so as to output power through the motor shaft 400.

[0103] In some embodiments, the number of rotors 200 in the motor 1000 can be one or more. The number of stators 300 can also be one or more.

[0104] The motor 1000 can be divided into a radial motor and an axial motor.

[0105] The radial motor is a motor 1000 in which the stator 300 and the rotor 200 are arranged along the radial direction Y. For example, in some embodiments, as shown in FIG. 2, the stator 300 is located at the outer periphery of the rotor 200, i.e., the stator 300 is sleeved on the outer periphery of the rotor 200; or the rotor 200 can also be located at the outer periphery of the stator 300, i.e., the rotor 200 is sleeved on the outer periphery of the stator 300.

[0106] The axial motor is a motor 1000 in which the stator 300 and the rotor 200 are arranged along the axial direction X, as shown in FIGS. 3-6. Specifically, the rotor 200 and the stator 300 are arranged along the axial direction X in sequence, so that the rotor 200 is located at the side of the stator 300 along the axial direction X, so that the stator 300 drives the rotor 200 to rotate, and then drives the motor shaft 400 to rotate.

[0107] In another embodiment, as shown in FIG. 3, the rotor 200 can be one, and the stator 300 can also be one, and the stator 300 is located at one side of the rotor 200 along the axial direction X. This motor 1000 has a simple structure and a small size.

[0108] In yet another embodiment, as shown in FIG. 4, the motor 1000 includes two stators 300 and one rotor 200, and the two stators 300 are located at opposite sides of the rotor 200 along the axial direction X. In this way, the same rotor 200 can be driven to rotate by the two stators 300, so as to improve the output power, and the motor 1000 has a more compact structure.

[0109] In still another embodiment, as shown in FIG. 5, the motor 1000 includes two rotors 200 and one stator 300, and the two rotors 200 are located at opposite sides of the stator 300 along the axial direction X, and the two rotors 200 are fixedly connected to the motor shaft 400. In this way, the same two rotors 200 can be driven to rotate by the one stator 300, and the same motor shaft 400 is driven to rotate, so as to improve the output power, and the motor 1000 has a more compact structure.

[0110] In some other embodiments, referring to FIG. 6, the motor 1000 includes a plurality of rotors 200 and a plurality of stators 300, which are arranged along the axial direction X. The stator 300 is arranged between two adjacent rotors 200 along the axial direction X, and the rotor 200 is arranged between two adjacent stators 300 along the axial direction X. The plurality of rotors 200 are driven to rotate by the plurality of stators 300, and the motor shaft 400 is driven to rotate, so as to improve the output power.

[0111] In some embodiments, referring to FIGS. 2-8, FIG. 7 is a perspective view of the resolver 100 according to some embodiments of the present application, and FIG. 8 is an exploded view of FIG. 7. The electric drive system can further include the resolver 100, which can be used to measure the angular velocity, angular displacement, and the like of the motor shaft 400.

[0112] In some embodiments, referring to FIGS. 2-8, the resolver 100 includes a fixed part 10 and a rotating part 20, which is arranged to be rotatable relative to the fixed part 10. Specifically, the fixed part 10 includes a fixed winding 12, and the rotating part 20 includes a rotating winding 21, which is arranged to be rotatable relative to the fixed winding 12.

[0113] The fixed winding 12 refers to the winding in the fixed part 10 of the resolver 100, and the rotating winding 21 refers to the winding in the rotating part 20 of the resolver 100.

[0114] The rotor 200 is fixedly connected to the rotating part 20. Specifically, the motor shaft 400 is fixedly connected to at least one of the rotating winding 21 of the rotating part 20 and the rotating shaft structure 23 described below. As an example, the motor shaft 400 is fixedly connected to the rotating shaft structure 23.

[0115] Specifically, the fixed winding 12 can serve as the primary winding of the resolver 100 to receive the excitation voltage. The rotating winding 21 can serve as the secondary winding of the resolver 100 to obtain the induced voltage through electromagnetic coupling with the primary winding. The induced voltage of the rotating winding 21 can change with the angular displacement of the rotating winding, so that the angular displacement and angular velocity of the rotor 200 fixedly connected to the rotating part 20 can be measured, thereby achieving measurement of the motor 1000.

[0116] The control system 3000 can be electrically connected to the fixed winding 12 and the stator 300. The control system 3000 can provide an excitation voltage to the fixed winding 12, so that the fixed winding 12 generates a magnetic field. The rotating winding 21 can rotate with the rotor 200 of the motor 1000, and the rotating winding 21 is electromagnetically coupled to the fixed winding 12, so that the rotating winding 21 obtains an induced voltage. Thus, the angular displacement, angular velocity and other information of the rotor 200 can be measured, and the control system 3000 can control the operation of the motor 1000 based on the information.

[0117] The rotating transformer 100 has a central axis L, and the rotating portion 20 can rotate relative to the fixed portion 10 around the central axis L. The rotating transformer 100 also has an axial direction X, a circumferential direction Z and a radial direction Y, and the axial direction X of the rotating transformer 100 is parallel to the central axis L. The axial direction X of the rotating transformer 100 refers to the axial direction X of the circle defined when the rotating portion 20 rotates relative to the fixed portion 10. The circumferential direction Z of the rotating transformer 100 is the circumferential direction of the circle defined when the rotating portion 20 rotates relative to the fixed portion 10, that is, the rotating direction of the rotating portion 20. The radial direction Y of the rotating transformer 100 is the radial direction of the circle defined when the rotating portion 20 rotates relative to the fixed portion 10.

[0118] The axial direction X of the rotating transformer 100 is the axial direction X of the motor 1000, which can be directly referred to as the axial direction X hereinafter. The circumferential direction Z of the rotating transformer 100 is the circumferential direction Z of the motor 1000, which can be directly referred to as the circumferential direction Z hereinafter. The radial direction Y of the rotating transformer 100 is the radial direction Y of the motor 1000, which can be directly referred to as the radial direction Y hereinafter.

[0119] Please refer to FIGS. 7-10, and other drawings. FIG. 9 is a sectional view of FIG. 7 along A-A, and FIG. 10 is an enlarged view of B in FIG. 9. The rotating transformer 100 provided by the embodiments of the present application includes a fixed portion 10 and a rotating portion 20. The fixed portion 10 includes a fixed magnetic core 11 and a fixed winding 12 connected to the fixed magnetic core 11. The rotating portion 20 includes a rotating winding 21 and a rotating magnetic core 22 connected to the rotating winding 21. The fixed magnetic core 11 is sleeved on the outer periphery of the rotating magnetic core 22, and forms a magnetic core window 40 together with the rotating magnetic core 22, and at least part of the rotating winding 21 is arranged in the magnetic core window 40. The rotating magnetic core 22 can rotate relative to the fixed magnetic core 11, and is spaced from the fixed magnetic core 11 along the radial direction Y to form an air gap 30, and the air gap 30 is respectively communicated with the opposite ends of the magnetic core window 40 along the axial direction X.

[0120] The fixed portion 10 is the portion of the rotating transformer 100 that does not rotate. Specifically, the fixed winding 12 and the fixed magnetic core 11 are the portions of the rotating transformer 100 that do not rotate.

[0121] The rotating part 20 is a rotatable part of the resolver 100. The resolver 100 can rotate relative to the fixed part 10 around the center axis L. Specifically, the rotating winding 21 and the rotating magnetic core 22 are rotatable parts of the resolver 100, and the rotating winding 21 and the rotating magnetic core 22 can rotate together around the center axis L.

[0122] The fixed magnetic core 11 and the rotating magnetic core 22 are both components with high magnetic conductivity. The fixed winding 12 receives an excitation voltage and can generate a magnetic field. The fixed winding 12 and the rotating winding 21 can achieve electromagnetic coupling, so that the rotating winding 21 generates an induced voltage. The fixed magnetic core 11 and the rotating magnetic core 22 are both excited to generate a magnetic field. Based on the high magnetic conductivity of the fixed magnetic core 11 and the rotating magnetic core 22, the magnetic field of the resolver 100 is concentrated, thereby improving the electromagnetic coupling of the resolver 100, improving the rotation stability of the resolver 100, and improving the measurement accuracy of the resolver 100. Specifically, the fixed magnetic core 11 and the rotating magnetic core 22 form a magnetic core window 40, and at least part of the rotating winding 21 is located in the magnetic core window 40, so that the fixed winding 12 and the rotating winding 21 can achieve electromagnetic coupling in the magnetic core window 40 with high coupling capability, thereby realizing efficient voltage conversion to improve the rotation stability of the resolver 100.

[0123] The magnetic core window 40 refers to a window formed by the fixed magnetic core 11 and the rotating magnetic core 22 for electromagnetic coupling of the fixed winding 12 and the rotating winding 21. The magnetic core window 40 is a space defined by the main magnetic circuit of the fixed winding 12 and the rotating winding 21, and the main magnetic circuit passes through the air gap 30.

[0124] The fixed magnetic core 11 and the rotating magnetic core 22 can be made of at least one of silicon steel sheet, ferrite, microcrystalline, ultramicrocrystalline, and permalloy material, so that the fixed magnetic core 11 and the rotating magnetic core 22 have high magnetic conductivity.

[0125] As shown in FIGS. 9 and 10, the rotating magnetic core 22 and the fixed magnetic core 11 are spaced apart along the radial direction Y to form the air gap 30, and the magnetic core window 40 has the air gap 30 at opposite ends along the axial direction X. The air gap 30 and the magnetic core window 40 are distributed and communicated along the axial direction X.

[0126] For the convenience of description, the air gap 30 at the opposite ends of the magnetic core window 40 along the axial direction X is respectively a first air gap 30a and a second air gap 30b. It can be understood that the rotating magnetic core 22 and the fixed magnetic core 11 are spaced apart along the radial direction Y to form the first air gap 30a, and are spaced apart along the radial direction Y to form the second air gap 30b, and the first air gap 30a and the second air gap 30b are spaced apart along the axial direction X. The magnetic core window 40 is located between the first air gap 30a and the second air gap 30b along the axial direction X. The first air gap 30a and the magnetic core window 40 are distributed and communicated along the axial direction X, and the second air gap 30b and the window are distributed and communicated along the axial direction X.

[0127] The rotating transformer 100 provided by the embodiment of the present application sets the fixed magnetic core 11 and the rotating magnetic core 22, and the fixed magnetic core 11 and the rotating magnetic core 22 are spaced apart along the radial direction Y to form the air gap 30, which is communicated with the opposite ends of the magnetic core window 40 along the axial direction X, so that when the rotating part 20 moves along the axial direction X relative to the fixed part 10, the size of the air gap 30 along the radial direction Y does not change, which makes the main magnetic circuit of the fixed magnetic core 11 and the rotating magnetic core 22 basically unchanged, thereby reducing the inductance fluctuation of the rotating transformer 100, reducing the sensitivity of the rotating transformer 100 to the axial X movement of the rotating part 20 relative to the fixed part 10, and helping to improve the rotation stability of the rotating transformer 100, thereby improving the measurement accuracy of the rotating transformer 100.

[0128] In addition, the size of the air gap 30 along the radial direction Y is not affected by the axial X movement of the rotating part 20, so that the axial X movement of the rotating part 20 does not need to leave space for the air gap 30 along the radial direction Y, which makes the size of the air gap 30 along the radial direction Y very small, thereby increasing the inductance of the rotating transformer 100, and helping to improve the measurement accuracy of the rotating transformer 100.

[0129] In addition, by setting the first air gap 30a and the second air gap 30b at the opposite ends of the magnetic core window 40 along the axial direction X, at least part of the rotating winding 21 is located in the magnetic core window 40, so that at least part of the rotating winding 21 is located between the first air gap 30a and the second air gap 30b along the axial direction X. Moreover, the first air gap 30a and the second air gap 30b are both formed by spacing the fixed magnetic core 11 and the rotating magnetic core 22 along the radial direction Y. In this way, on the one hand, the current distribution of the rotating winding 21 can be improved, so that the heat generation of the rotating winding 21 is more uniform, and the loss of the rotating winding 21 can be reduced; on the other hand, it is helpful to make the rotating winding 21 away from the air gap 30, so that the eddy current loss caused by the space harmonic magnetic field at the air gap 30 on the rotating winding 21 can be improved. Based on this, it is helpful to improve the measurement accuracy of the rotating transformer 100.

[0130] In some embodiments, please refer to FIG. 7 and FIG. 8, and combine with other figures. The fixed winding 12 is located in the magnetic core window 40, which facilitates the electromagnetic coupling between the fixed winding 12 and the rotating winding 21.

[0131] In some embodiments, please refer to FIG. 7 to FIG. 10, and combine with other figures. The fixed magnetic core 11 is provided with the first end portion 1111 and the second end portion 1112 at opposite ends along the axial direction X of the magnetic core window 40, the first end portion 1111 and the rotating magnetic core 22 are spaced apart along the radial direction Y to form the air gap 30, and the second end portion 1112 and the rotating magnetic core 22 are spaced apart along the radial direction Y to form the air gap 30.

[0132] As shown in FIG. 9 and FIG. 10, the inner circumferential side of the fixed magnetic core 11 is recessed, so that the inner circumferential side of the fixed magnetic core 11 protrudes to form the first end portion 1111 and the second end portion 1112 spaced apart along the axial direction X. The space formed by the recess of the fixed magnetic core 11 and the outer circumferential wall of the rotating magnetic core 22 form the magnetic core window 40, so that the first end portion 1111 and the second end portion 1112 are the two opposite walls of the magnetic core window 40 along the axial direction X. The first end portion 1111 surrounds the outer circumference of the rotating magnetic core 22, and the second end portion 1112 surrounds the outer circumference of the rotating magnetic core 22.

[0133] As shown in FIG. 9, taking the part of the fixed magnetic core 11 located on the right side of the rotating magnetic core 22 as an example, the part of the fixed magnetic core 11 is approximately "U" shaped, and the first end portion 1111 and the second end portion 1112 are opposite ends of the "U" shaped structure, respectively.

[0134] The inner circumferential wall of the first end portion 1111 is provided with the first end face 101, the inner circumferential wall of the second end portion 1112 is provided with the second end face 102, and the outer circumferential wall of the rotating magnetic core 22 is provided with the third end face 203. The first end face 101 and the third end face 203 are spaced apart along the radial direction Y to form the first air gap 30a, and the second end face 102 and the third end face 203 are spaced apart along the radial direction Y to form the second air gap 30b.

[0135] By providing the first end portion 1111 and the second end portion 1112, the fixed magnetic core 11 and the rotating magnetic core 22 can surround the magnetic core window 40, and the air gap 30 connected to opposite ends of the magnetic core window 40 along the axial direction X is formed along the radial direction Y. In this way, it is helpful to reduce the sensitivity of the rotary transformer 100 to the axial direction X movement, improve the rotation stability of the rotary transformer 100, and improve the measurement accuracy of the rotary transformer 100.

[0136] In addition, the first end portion 1111 and the second end portion 1112 are formed on the inner circumferential side of the fixed magnetic core 11, so that the magnetic core window 40 is located substantially in the inner space of the fixed magnetic core 11, and the inner circumferential wall of the fixed magnetic core 11 is very close to the outer circumferential wall of the rotating magnetic core 22 in the radial direction Y, so as to reduce the size of the air gap 30 in the radial direction Y. In this way, the rotating magnetic core 22 does not need to be additionally processed to reduce the air gap 30, thereby helping to reduce the size of the rotating magnetic core 22 in the radial direction Y, so as to reduce the volume and weight of the rotating magnetic core 22, so that the rotating magnetic core 22 can be adapted to high-speed rotating occasions, so that the rotary transformer 100 can be applied to high-speed rotating occasions.

[0137] In other embodiments, the outer circumferential wall of the rotating magnetic core 22 can also be protruding to form an end portion, so that the end portion of the rotating magnetic core 22 and the fixed magnetic core 11 are spaced apart to form the air gap 30 in the radial direction Y. That is, the cross-sectional view of the rotating magnetic core 22 parallel to the axial direction X can be approximately in the shape of "L" or "U".

[0138] In some embodiments, please refer to FIGS. 9 and 10, and combine with other drawings. In the axial direction X, the opposite ends of the rotating magnetic core 22 can be flush with the fixed magnetic core 11.

[0139] Specifically, one end of the rotating magnetic core 22 in the axial direction X is flush with one end of the fixed magnetic core 11 in the axial direction X, and the other end of the rotating magnetic core 22 in the axial direction X is flush with the other end of the fixed magnetic core 11 in the axial direction X.

[0140] In other embodiments, please refer to FIG. 11, and combine with other drawings. FIG. 11 is a cross-sectional view of the rotary transformer 100 provided by some embodiments of the present application. In the axial direction X, the opposite ends of the rotating magnetic core 22 protrude out of the fixed magnetic core 11.

[0141] As shown in FIG. 11, the dimension of the rotating magnetic core 22 in the axial direction X is greater than the dimension of the fixed magnetic core 11 in the axial direction X. One end of the rotating magnetic core 22 in the axial direction X protrudes out of one end of the fixed magnetic core 11 in the axial direction X, and the other end of the rotating magnetic core 22 in the axial direction X protrudes out of the other end of the fixed magnetic core 11 in the axial direction X.

[0142] In this way, when the rotating magnetic core 22 moves in the axial direction X, the rotating magnetic core 22 can still be directly opposite to the fixed magnetic core 11 in the radial direction Y, and the direct opposite area of the rotating magnetic core 22 and the fixed magnetic core 11 is larger, so that the problem that the main magnetic circuit is affected when the rotating magnetic core 22 moves can be improved, thereby further reducing the fluctuation of inductance, and further reducing the sensitivity of the rotary transformer 100 to the axial direction X movement.

[0143] In some embodiments, please refer to FIG. 12, and combine with other figures. FIG. 12 is a sectional view of the resolver 100 according to some embodiments of the present application. In the axial direction X, the opposite ends of the fixed magnetic core 11 protrude out of the rotating magnetic core 22.

[0144] As shown in FIG. 12, the dimension of the rotating magnetic core 22 along the axial direction X is smaller than the dimension of the fixed magnetic core 11 along the axial direction X. One end of the fixed magnetic core 11 along the axial direction X protrudes out of one end of the rotating magnetic core 22 along the axial direction X, and the other end of the fixed magnetic core 11 along the axial direction X protrudes out of the other end of the rotating magnetic core 22 along the axial direction X.

[0145] By using the above technical solution, when the rotating magnetic core 22 moves in the direction of the second air gap 30b towards the first air gap 30a, the facing area of the rotating magnetic core 22 and the fixed magnetic core 11 at the first air gap 30a increases, and the facing area of the rotating magnetic core 22 and the fixed magnetic core 11 at the second air gap 30b decreases, so that the overall facing area of the rotating magnetic core 22 and the fixed magnetic core 11 remains basically unchanged. This can improve the problem that the main magnetic circuit is affected when the rotating magnetic core 22 moves, thereby further reducing the fluctuation of the inductance, and further reducing the sensitivity of the resolver 100 to the axial movement X.

[0146] In some embodiments, please refer to FIGS. 7-10, and combine with other figures. The rotating winding 21 is a planar winding.

[0147] The planar winding refers to a winding structure in which the wire is wound layer by layer on a plane. In some examples, the planar winding can include a PCB (Printed Circuit Board) winding, which refers to an electromagnetic coil structure realized on a printed circuit board. Specifically, the PCB winding prints the wire of the coil on the PCB board, forming a compact and integrated coil structure.

[0148] In this way, the rotating winding 21 is substantially in a plate-like structure. On the one hand, this facilitates the layout of the rotating winding 21 and the fixed winding 12 in the magnetic core window 40, thereby improving the space utilization of the magnetic core window 40 and facilitating the miniaturization and lightweight design of the resolver 100. On the other hand, this facilitates the rotating winding 21 to be away from the air gap 30, thereby improving the influence of the spatial harmonic magnetic field at the air gap 30 on the rotating winding 21, reducing the eddy current loss caused by the spatial harmonic magnetic field on the rotating winding 21, and improving the rotation stability and measurement accuracy of the resolver 100.

[0149] In addition, the rotating winding 21 is designed as a planar winding, so that the rotating winding 21 can be preformed, and then the rotating magnetic core 22 is installed on the rotating winding 21. In this way, the rotating magnetic core 22 does not need to be formed as a "U" shaped structure to wind and limit the rotating winding 21, thereby facilitating the miniaturization and light weight design of the rotating magnetic core 22, and further facilitating the application of the rotary transformer 100 in high-speed rotating occasions.

[0150] In some embodiments, the fixed winding 12 can be a planar winding, or a winding of a wire, a copper foil, etc. wound on the fixed magnetic core 11.

[0151] In some embodiments, please refer to FIGS. 9 to 13, and combine with other drawings. FIG. 13 is a cross-sectional view of the rotary transformer 100 provided in some embodiments of the present application. The rotating winding 21 and the fixed winding 12 are arranged along the axial direction X.

[0152] In this way, on the one hand, the rotating winding 21 is away from the air gap 30, thereby improving the influence of the spatial harmonic magnetic field at the air gap 30 on the rotating winding 21, reducing the eddy current loss caused by the spatial harmonic magnetic field on the rotating winding 21, improving the rotation stability of the rotary transformer 100, and improving the measurement accuracy of the rotary transformer 100. On the other hand, the rotating winding 21 and the fixed winding 12 can be close to each other along the axial direction X, thereby improving the electromagnetic coupling coefficient between the rotating winding 21 and the fixed winding 12, reducing the loss of the rotating winding 21, improving the rotation stability of the rotary transformer 100, and improving the measurement accuracy of the rotary transformer 100.

[0153] In some embodiments, please refer to FIGS. 9 to 12, and combine with other drawings. The number of the fixed windings 12 is multiple, and the rotating winding 21 is respectively provided with the fixed windings 12 on opposite sides along the axial direction X.

[0154] It can be understood that, along the axial direction X, the rotating winding 21 and the fixed winding 12 can be distributed in the layout mode of fixed winding 12, rotating winding 21, fixed winding 12, and so on.

[0155] As an example, as shown in FIG. 9, the number of the rotating winding 21 is one, and the number of the fixed windings 12 is two. The two fixed windings 12 are distributed along the axial direction X with a certain interval, and along the axial direction X, the rotating winding 21 is located between the two fixed windings 12.

[0156] In this way, the coupling coefficient between the rotating winding 21 and the fixed winding 12 can be improved, thereby reducing the loss of the rotating winding 21, improving the rotation stability of the rotary transformer 100, and improving the measurement accuracy of the rotary transformer 100.

[0157] In other embodiments, as shown in FIG. 13, the fixed winding 12 can be located on only one side of the rotating winding 21 along the axial direction X.

[0158] In some embodiments, the rotating winding 21 and the fixed winding 12 are both planar windings, which facilitates the layout of the rotating winding 21 and the fixed winding 12 in the magnetic core window 40 and facilitates the electromagnetic coupling of the rotating winding 21 and the fixed winding 12.

[0159] In some embodiments, please refer to FIGS. 7-13, and combine with other drawings. The outer peripheral wall of the rotating magnetic core 22 is linearly arranged along the axial direction X.

[0160] Based on this, the rotating magnetic core 22 has an approximate "I" shape structure on the cross section parallel to the axial direction X.

[0161] In this way, compared with the rotating magnetic core 22 in some cases made into "L" shape or "U" shape, the rotating magnetic core 22 provided by the embodiments of the present application has a smaller volume, which can achieve the effects of miniaturization and light weight. Based on this, the rotating magnetic core 22 can realize high-speed rotation, that is, the rotary transformer 100 can be applied to high-speed rotating occasions.

[0162] In some embodiments, please refer to FIGS. 7 and 8, and combine with other drawings. The rotating magnetic core 22 includes a plurality of first magnetic cores 221.

[0163] Among them, the first magnetic core 221 refers to one part of the rotating magnetic core 22, which has a higher magnetic conductivity.

[0164] Among them, the fixed magnetic core 11 can form an air gap 30 with the corresponding first magnetic core 221 along the radial direction Y.

[0165] Among them, the plurality of first magnetic cores 221 can adopt at least one of the following three schemes:

[0166] The first kind, as shown in FIGS. 7 and 8, and combine with other drawings. At least part of the first magnetic core 221 is distributed on the rotating winding 21 along the circumferential direction Z.

[0167] As an example, as shown in FIG. 8, the plurality of first magnetic cores 221 are distributed on the rotating winding 21 along the circumferential direction Z.

[0168] The second kind, at least part of the first magnetic core 221 is distributed on the rotating winding 21 along the axial direction X.

[0169] The third kind, at least part of the first magnetic core 221 is distributed on the rotating winding 21 along the radial direction Y.

[0170] By adopting the above technical solution, the plurality of first magnetic cores 221 are distributed on the rotating winding 21 to form the rotating magnetic core 22. In this way, the weight of the rotating magnetic core 22 is reduced, so that the rotating transformer 100 can be applied to high-speed rotating occasions.

[0171] In some embodiments, please refer to FIGS. 7-10, and in combination with other drawings. The rotating winding 21 is provided with a first limiting groove 201, and the rotating magnetic core 22 is limited in the first limiting groove 201 along the radial direction Y.

[0172] The first limiting groove 201 refers to a groove provided on the rotating winding 21 for limiting the rotating magnetic core 22.

[0173] By limiting the rotating magnetic core 22 along the radial direction Y through the first limiting groove 201, the first limiting groove 201 can resist the centrifugal force during the rotation of the rotating magnetic core 22, so as to improve the stability of the rotating part 20 during rotation, so that the rotating transformer 100 can be applied to high-speed rotating occasions.

[0174] In some embodiments, as shown in FIGS. 7-10, the first limiting groove 201 can be provided through the rotating winding 21 along the axial direction X.

[0175] In this way, the rotating magnetic core 22 can pass through the first limiting groove 201 along the axial direction X, so that the rotating magnetic core 22 extends out of the opposite sides of the first limiting groove 201 along the axial direction X. That is, along the axial direction X, the opposite parts of the rotating magnetic core 22 are located outside the opposite sides of the first limiting groove 201, and the rotating winding 21 is located between the opposite parts of the rotating magnetic core 22 along the axial direction X. The part of the rotating magnetic core 22 extending out of one side of the first limiting groove 201 along the axial direction X can form the first air gap 30a with the fixed magnetic core 11 along the radial direction Y, and the part of the rotating magnetic core 22 extending out of the other side of the first limiting groove 201 along the axial direction X can form the second air gap 30b with the fixed magnetic core 11 along the radial direction Y.

[0176] In other embodiments, the rotating winding 21 is recessed to form the above-mentioned first limiting groove 201 along the opposite sides of the axial direction X, that is, the first limiting groove 201 can constitute a groove. The rotating magnetic core 22 can include a plurality of the above-mentioned first magnetic cores 221, and at least part of the first magnetic cores 221 are distributed in sequence along the axial direction X. The first magnetic cores 221 are limited in the corresponding first limiting grooves 201, so that the rotating winding 21 is provided with the first magnetic cores 221 along the opposite sides of the axial direction X. The first magnetic core 221 on one side of the rotating winding 21 along the axial direction X is spaced from the fixed magnetic core 11 to form the first air gap 30a, and the first magnetic core 221 on the other side of the rotating winding 21 along the axial direction X is spaced from the fixed magnetic core 11 to form the second air gap 30b.

[0177] It needs to be supplemented here that the rotating winding 21 can be provided with a plurality of first limiting grooves 201, among the plurality of first limiting grooves 201, part of the first limiting grooves 201 can be through grooves, and part of the first limiting grooves 201 can be recesses.

[0178] In some embodiments, please refer to FIG. 7 and FIG. 8, and combine with other drawings. The rotating winding 21 is provided with a plurality of first limiting grooves 201, and at least part of the first limiting grooves 201 are distributed along the circumferential direction Z. The rotating magnetic core 22 includes a plurality of first magnetic cores 221, and each of the first magnetic cores 221 is limited in the corresponding first limiting groove 201 along the radial direction Y and the circumferential direction Z.

[0179] By adopting the above technical solution, on the one hand, each of the first magnetic cores 221 is limited in the corresponding first limiting groove 201, and the plurality of first limiting grooves 201 are distributed along the circumferential direction Z, so that the plurality of first magnetic cores 221 are arranged at intervals, which helps to reduce the weight of the rotating magnetic core 22, and helps the rotating magnetic core 22 to be applied to high-speed rotating occasions, so that the rotary transformer 100 can be applied to high-speed rotating occasions. On the other hand, the first magnetic core 221 is limited in the first limiting groove 201 along the radial direction Y and the circumferential direction Z, so that the rotating magnetic core 22 can be stably installed on the rotating winding 21, which improves the problem that the rotating magnetic core 22 is thrown out due to large centrifugal rate during high-speed rotation, and improves the stability of high-speed rotation of the rotary transformer 100.

[0180] As an example, as shown in FIG. 8, the first limiting groove 201 is a through groove penetrating the rotating winding 21, and the plurality of first limiting grooves 201 are distributed at intervals along the circumferential direction Z on the rotating winding 21. The rotating magnetic core 22 includes a plurality of first magnetic cores 221, the plurality of first magnetic cores 221 are distributed at intervals along the circumferential direction Z, and each of the first magnetic cores 221 is limited in the corresponding first limiting groove 201.

[0181] As shown in FIG. 8, the rotating winding 21 can include an intermediate part 211, a connecting part 213 and an annular part 212. The annular part 212 surrounds the outer periphery of the intermediate part 211 and is distributed at intervals with the intermediate part 211. The connecting part 213 is connected between the annular part 212 and the intermediate part 211, the number of the connecting part 213 is a plurality, and the plurality of connecting parts 213 are distributed at intervals along the circumferential direction Z, so that the annular part 212, the intermediate part 211 and the two adjacent connecting parts 213 form the first limiting groove 201. In the case that the first magnetic core 221 is limited in the first limiting groove 201, the first magnetic core 221 is limited between the annular part 212 and the intermediate part 211 along the radial direction Y, and is limited between the two adjacent connecting parts 213 along the circumferential direction Z, so that the rotating magnetic core 22 is limited in the circumferential direction Z and the radial direction Y on the rotating winding 21.

[0182] At least part of the annular portion 212 of the rotating winding 21 is located in the magnetic core window 40 for electromagnetic coupling with the fixed winding 12.

[0183] In some embodiments, please refer to FIG. 7 to FIG. 15, and combine with other drawings. FIG. 14 is a perspective view of the rotating part 20 of the resolver 100 according to some embodiments of the present application, and FIG. 15 is an exploded view of FIG. 14. The resolver 100 further comprises a rotating shaft structure 23, and the rotating magnetic core 22 is mounted on the rotating winding 21 through the rotating shaft structure 23.

[0184] The rotating shaft structure 23 refers to a structure for mounting the rotating magnetic core 22 on the rotating winding 21.

[0185] By mounting the rotating magnetic core 22 on the rotating winding 21 through the rotating shaft structure 23, the rotating magnetic core 22 does not need to be additionally designed to mount and limit the rotating winding 21, for example, the cross section of the rotating magnetic core 22 parallel to the axial direction X does not need to be designed as an “L” shape or a “U” shape. In this way, the structure of the rotating magnetic core 22 can be very simple and small, for example, the outer peripheral wall of the rotating magnetic core 22 is arranged to extend linearly along the axial direction X, so that the rotating magnetic core 22 is designed as an “I” shape, which can reduce the weight of the rotating magnetic core 22, so that the rotating magnetic core 22 can rotate at a high speed relative to the fixed magnetic core 11, thereby making the resolver 100 can be applied to high-speed rotating occasions.

[0186] It should be noted here that when the resolver 100 is applied to the motor 1000, the rotating shaft structure 23 can be connected to the motor shaft 400 of the motor 1000, so that the motor shaft 400 can rotate synchronously with the rotating part 20 of the resolver 100.

[0187] In some embodiments, please refer to FIG. 7 to FIG. 15, and combine with other drawings. The rotating shaft structure 23 is mounted on the rotating winding 21, and the rotating shaft structure 23 comprises a first limiting portion 2312 and a second limiting portion 2322, and the first limiting portion 2312 and the second limiting portion 2322 are respectively arranged on opposite sides of the rotating winding 21 along the axial direction X. The rotating magnetic core 22 comprises a first magnetic core 221.

[0188] As shown in FIGS. 7-15, the rotating shaft structure 23 includes a first limiting portion 2312 and a second limiting portion 2322, which are spaced apart along the axial direction X and located on opposite sides of the rotating winding 21 along the axial direction X, respectively. The rotating shaft structure 23 is mounted on the rotating winding 21 except for the first limiting portion 2312 and the second limiting portion 2322, so that the relative positions between the first limiting portion 2312 and the rotating winding 21 and the relative positions between the second limiting portion 2322 and the rotating winding 21 can be fixed, i.e., the rotating shaft structure 23 is limited as a whole on the rotating winding 21.

[0189] Specifically, the relative positions between the first limiting portion 2312 and the rotating winding 21 along the axial direction X and the relative positions between the second limiting portion 2322 and the rotating winding 21 along the axial direction X can be fixed, i.e., the relative positions of the first limiting portion 2312 and the second limiting portion 2322 along the axial direction X can be fixed, so that the rotating shaft structure 23 is limited as a whole on the rotating winding 21 along the axial direction X.

[0190] The first magnetic core 221 refers to at least part of the structure of the rotating magnetic core 22, which has a higher magnetic conductivity and is the same as the first magnetic core 221 described above. The number of the first magnetic core 221 can be one or more.

[0191] The first limiting portion 2312 and the second limiting portion 2322 can be used to limit the first magnetic core 221 along the axial direction X, and at least one of the following two schemes can be used:

[0192] The first scheme is shown in FIGS. 7-15 and in combination with other drawings. The first magnetic core 221 passes through the rotating winding 21 along the axial direction X and is limited along the axial direction X between the first limiting portion 2312 and the second limiting portion 2322.

[0193] Specifically, the rotating winding 21 is provided with a first limiting slot 201 along the axial direction X, and the first magnetic core 221 is arranged in the first limiting slot 201, so that the first magnetic core 221 extends out of opposite sides of the first limiting slot 201 along the axial direction X, respectively, and the part of the first magnetic core 221 extending out of one side of the first limiting slot 201 is spaced apart from the fixed magnetic core 11 to form a first air gap 30a, and the part of the first magnetic core 221 extending out of the other side of the first limiting slot 201 is spaced apart from the fixed magnetic core 11 to form a second air gap 30b.

[0194] Along the axial direction X, the first magnetic core 221 is limited between the first limiting portion 2312 and the second limiting portion 2322, so that the first limiting portion 2312 and the second limiting portion 2322 are limited at opposite ends of the first magnetic core 221 along the axial direction X, respectively.

[0195] In this way, the first magnetic core 221 is axially limited by the first limiting portion 2312 and the second limiting portion 2322, so that the first magnetic core 221 is axially limited on the rotating shaft structure 23. Based on the rotating shaft structure 23 being limited on the rotating winding 21, the first magnetic core 221 and the rotating winding 21 can be relatively limited in the axial direction X.

[0196] In the second way, the rotating winding 21 is provided with the first magnetic core 221 on opposite sides in the axial direction X, and the first limiting portion 2312 and the second limiting portion 2322 respectively limit the corresponding first magnetic core 221 on the rotating winding 21 in the axial direction X.

[0197] It can be understood that, in the axial direction X, the rotating winding 21 is provided with the first magnetic core 221 on opposite sides, and the first magnetic core 221 on one side of the rotating winding 21 can be spaced apart from the fixed magnetic core 11 to form a first air gap 30a, and the first magnetic core 221 on the other side of the rotating winding 21 can be spaced apart from the fixed magnetic core 11 to form a second air gap 30b.

[0198] In the axial direction X, the first limiting portion 2312 and the second limiting portion 2322 are respectively located on opposite sides of the rotating winding 21, and the first magnetic core 221 on opposite sides of the rotating winding 21 is located between the first limiting portion 2312 and the second limiting portion 2322. The first limiting portion 2312 limits the first magnetic core 221 on one side of the rotating winding 21 on the rotating winding 21 in the axial direction X, that is, the first magnetic core 221 on one side of the rotating winding 21 is limited between the rotating winding 21 and the first limiting portion 2312 in the axial direction X. The second limiting portion 2322 limits the first magnetic core 221 on the other side of the rotating winding 21 on the rotating winding 21 in the axial direction X, that is, the first magnetic core 221 on the other side of the rotating winding 21 is limited between the rotating winding 21 and the second limiting portion 2322 in the axial direction X.

[0199] In this way, the rotating shaft structure 23 can install the rotating magnetic core 22 on the rotating winding 21, so that the rotating magnetic core 22 is at least limited on the rotating winding 21 in the axial direction X.

[0200] Based on this, the cross section of the rotating magnetic core 22 parallel to the axial direction X does not need to be made into an "L" shape or a "U" shape to wind and limit the rotating winding 21 in the axial direction X. In this way, the outer peripheral wall of the rotating magnetic core 22 can be arranged to extend linearly in the axial direction X, so that the structure of the rotating magnetic core 22 can be made into a simple "I" shape, so that the rotating magnetic core 22 can be inserted into the first limiting groove 201 of the rotating winding 21. Therefore, it is helpful to reduce the weight of the rotating magnetic core 22, so that the rotating magnetic core 22 can rotate at high speed relative to the fixed magnetic core 11, so that the rotating transformer 100 can be applied to high-speed rotating occasions.

[0201] In some embodiments, please refer to FIG. 14 and FIG. 15, and combine with other drawings. The rotating shaft structure 23 comprises a first rotating shaft 231 and a second rotating shaft 232. The first rotating shaft 231 comprises a first shaft body 2311 and the first limiting part 2312 which is connected to the first shaft body 2311. The second rotating shaft 232 comprises a second shaft body 2321 and the second limiting part 2322 which is connected to the second shaft body 2321. The first shaft body 2311 and the second shaft body 2321 are connected to each other to be installed on the rotating winding 21.

[0202] The first rotating shaft 231 and the second rotating shaft 232 are two components of the rotating shaft structure 23, that is, the rotating shaft structure 23 is processed in a segmented manner to obtain the first rotating shaft 231 and the second rotating shaft 232.

[0203] The first shaft body 2311 and the first limiting part 2312 are two parts of the first rotating shaft 231, and the second shaft body 2321 and the second limiting part 2322 are two parts of the first rotating shaft 231.

[0204] The first shaft body 2311 and the second shaft body 2321 are connected to each other to be installed on the rotating winding 21, so that the first limiting part 2312 and the second limiting part 2322 are limited relative to the rotating winding 21. That is, other parts of the rotating shaft structure 23 except the first limiting part 2312 and the second limiting part 2322 are installed on the rotating winding 21.

[0205] By dividing the rotating shaft structure 23 into the first rotating shaft 231 and the second rotating shaft 232, the first magnetic core 221 of the rotating magnetic core 22 can be first limited in the first limiting groove 201, and then the first limiting part 2312 of the first rotating shaft 231 and the second limiting part 2322 of the second rotating shaft 232 are pressed on the first magnetic core 221, and finally the first shaft body 2311 of the first rotating shaft 231 and the second shaft body 2321 of the second rotating shaft 232 are connected to each other to be installed on the rotating winding 21. In this way, the rotating magnetic core 22 is installed on the rotating winding 21 by the rotating shaft structure 23, and the stable installation effect of the rotating part 20 is realized. Based on this, the operation of installing the rotating magnetic core 22 on the rotating winding 21 by the rotating shaft structure 23 is very convenient and easy to realize.

[0206] It needs to be supplemented here that the rotating magnetic core 22 can be arranged around the outer periphery of the first shaft body 2311 and the second shaft body 2322, and the fixed magnetic core 11 can be arranged around the outer periphery of the first shaft body 2311 and the second shaft body 2321.

[0207] In some embodiments, please refer to FIG. 14 and FIG. 15, and combine with other figures. The middle part 211 of the rotating winding 21 can be annular. The first shaft body 2311 of the first rotating shaft 231 can be inserted into the middle part 211 along the axial direction X to be connected with the second shaft body 2321 of the second rotating shaft 232, so that the middle part 211 can be limited between the first shaft body 2311 and the second shaft body 2321 along the axial direction X, to realize the installation of the rotating shaft structure 23 on the rotating winding 21.

[0208] In some embodiments, please refer to FIG. 14 and FIG. 15, and combine with other figures. The rotating shaft structure 23 further comprises a third limiting part 2313.

[0209] The third limiting part 2313 refers to a part on the rotating shaft structure 23 for limiting the first magnetic core 221 in the circumferential direction Z.

[0210] The third limiting part 2313 can limit the first magnetic core 221 in at least one of the following two schemes:

[0211] Firstly, please refer to FIG. 14 and FIG. 15, and combine with other figures. The third limiting part 2313 and the first limiting part 2312 surround to form the second limiting groove 202.

[0212] It can be understood that the first rotating shaft 231 further comprises the third limiting part 2313, which is arranged on the first shaft body 2311, so that the third limiting part 2313 and the first limiting part 2312 surround to form the second limiting groove 202.

[0213] The number of the third limiting part 2313 on the first rotating shaft 231 can be multiple, and the multiple third limiting parts 2313 can be distributed on the first shaft body 2311 in the circumferential direction Z, so that the two adjacent third limiting parts 2313 can surround to form the second limiting groove 202 with the first limiting part 2312, so that the first rotating shaft 231 can surround to form multiple second limiting grooves 202 distributed in the circumferential direction Z.

[0214] Secondly, please refer to FIG. 14 and FIG. 15, and combine with other figures. The third limiting part 2313 and the second limiting part 2322 surround to form the second limiting groove 202.

[0215] It can be understood that the second rotating shaft 232 further comprises the third limiting part 2313, which is arranged on the second shaft body 2321, so that the third limiting part 2313 and the second limiting part 2322 surround to form the second limiting groove 202.

[0216] The third limiting portion 2313 on the second rotating shaft 232 can be multiple, and the multiple third limiting portions 2313 can be distributed on the second shaft body 2321 along the circumferential direction Z, so that the two adjacent third limiting portions 2313 and the second limiting portion 2322 can form the second limiting groove 202, so that the second rotating shaft 232 can form multiple second limiting grooves 202 distributed along the circumferential direction Z.

[0217] Based on the above structure, the first magnetic core 221 is limited in the second limiting groove 202 along the circumferential direction Z.

[0218] In this way, the rotating shaft structure 23 can also limit the rotating magnetic core 22 in the circumferential direction Z, so as to realize the stable installation effect of the rotating part 20, and facilitate the application of the rotating part 20 in high-speed rotating occasions.

[0219] In some embodiments, please refer to FIG. 8 and FIG. 16, and combine with other drawings. Wherein, FIG. 16 is an exploded schematic view of the resolver 100 provided by some other embodiments of the application. The fixed magnetic core 11 includes multiple second magnetic cores 111.

[0220] Among them, the second magnetic core 111 refers to one part of the fixed magnetic core 11, which has high magnetic conductivity.

[0221] Among them, the rotating magnetic core 22 can form an air gap 30 with the corresponding second magnetic core 111 along the radial direction Y.

[0222] Among them, the multiple second magnetic cores 111 can adopt at least one of the following three schemes:

[0223] The first kind, as shown in FIG. 16, at least part of the second magnetic core 111 is arranged along the circumferential direction Z.

[0224] The second kind, as shown in FIG. 8 and FIG. 16, at least part of the second magnetic core 111 is arranged along the axial direction X.

[0225] The third kind, at least part of the second magnetic core 111 is arranged along the radial direction Y.

[0226] By adopting the above technical scheme, the fixed magnetic core 11 can be divided into multiple second magnetic cores 111, which helps to reduce the weight of the fixed magnetic core 11, so as to realize the lightweight design of the resolver 100.

[0227] As an example, as shown in FIG. 8 and FIG. 9, the fixed magnetic core 11 can be divided into two second magnetic cores 111, and the two second magnetic cores 111 are distributed along the axial direction X.

[0228] One of the second magnetic cores 111 includes the first peripheral portion 1113 and the first end portion 1111, and the first peripheral portion 1113 is arranged around the outer periphery of the first end portion 1111. The other second magnetic core 111 includes the second peripheral portion 1114 and the second end portion 1112, and the second peripheral portion 1114 is arranged around the outer periphery of the second end portion 1112. The first peripheral portion 1113 and the second peripheral portion 1114 are sequentially arranged along the axial direction X, and the first end portion 1111 and the second end portion 1112 are arranged at intervals along the axial direction X. The first peripheral portion 1113, the second peripheral portion 1114, the first end portion 1111, the second end portion 1112, and the outer peripheral wall of the rotating magnetic core 22 form the magnetic core window 40. The first end portion 1111 and the rotating magnetic core 22 are arranged at intervals along the radial direction Y to form the first air gap 30a, and the second end portion 1112 and the rotating magnetic core 22 are arranged at intervals along the radial direction Y to form the second air gap 30b. The main magnetic circuit of the rotating magnetic core 22 and the fixed magnetic core 11 sequentially passes through the rotating magnetic core 22, the first air gap 30a, the first end portion 1111, the first peripheral portion 1113, the second peripheral portion 1114, the second end portion 1112, the second air gap 30b, and the rotating magnetic core 22.

[0229] As another example, as shown in FIG. 16, each of the two second magnetic cores 111 can be divided into a plurality of portions arranged along the circumferential direction Z. It can also be understood that the fixed magnetic core 11 is divided into two second magnetic cores 111 arranged along the axial direction X, and each of the two second magnetic cores 111 includes a plurality of second magnetic cores 111 arranged along the circumferential direction Z. One of the second magnetic cores 111 includes the first end portion 1111, and the other of the second magnetic cores 111 includes the second end portion 1112.

[0230] The motor 1000 provided by the embodiment of the present application includes a resolver 100. The resolver 100 in the embodiment is the same as the resolver 100 in the previous embodiment, and details are described in the resolver 100 in the previous embodiment, which will not be described here.

[0231] As an example, the motor 1000 further includes a rotor 200, a stator 300, and a motor shaft 400. The rotor 200 is sleeved on the motor shaft 400 and is fixed to the motor shaft 400. The stator 300 is sleeved outside the motor shaft 400, and the motor shaft 400 can rotate relative to the stator 300. The rotating winding 21 of the resolver 100 is electrically connected to the rotor 200.

[0232] The rotating shaft structure 23 of the resolver 100 is fixedly connected to the motor shaft 400.

[0233] Therefore, the resolver 100 can be used to measure the angular velocity, angular displacement, and other information of the motor shaft 400.

[0234] The motor 1000 provided by the embodiment of the present application adopts the resolver 100 related by each of the above embodiments, so that the inductance of the resolver 100 is less sensitive to the axial X movement, thereby improving the rotation stability of the resolver 100 and improving the measurement accuracy of the resolver 100. In addition, the resolver 100 can realize high-speed rotation.

[0235] Referring to FIG. 1, and in combination with other drawings, the electric drive system provided by the embodiment of the present application includes a motor 1000 and a resolver 100. The resolver 100 in the embodiment is the same as the resolver 100 in the previous embodiment, and the related description of the resolver 100 in the previous embodiment is referred to, and details are not described herein.

[0236] The rotating part 20 of the resolver 100 is fixedly connected with the rotor 200 of the motor 1000.

[0237] As an example, the rotating shaft structure 23 of the rotating part 20 is fixedly connected with the motor shaft 400 of the motor 1000.

[0238] In addition, the control system 3000 can be electrically connected to the fixed winding 12 and the stator 300, so as to measure the rotation angular velocity and angular displacement of the motor 1000, thereby controlling the operation of the motor 1000.

[0239] The electric drive system provided by the embodiment of the present application adopts the resolver 100 related by each of the above embodiments, so that the electric drive system can stably and efficiently output power.

[0240] Referring to FIG. 1, and in combination with other drawings, the electric drive system provided by the embodiment of the present application includes a motor 1000 and a resolver 100. The resolver 100 in the embodiment is the same as the resolver 100 in the previous embodiment, and the related description of the resolver 100 in the previous embodiment is referred to, and details are not described herein.

[0241] The electric drive system provided by the embodiment of the present application adopts the resolver 100 related by each of the above embodiments, so that the electric drive system can stably and efficiently output power.

[0242] As one of the embodiments of the present application, as shown in FIGS. 7-10, the resolver 100 includes a fixed part 10 and a rotating part 20. The fixed part 10 includes a fixed magnetic core 11 and a plurality of fixed windings 12 connected to the fixed magnetic core 11. The rotating part 20 includes a rotating winding 21, a rotating magnetic core 22, and a shaft structure 23 that mounts the rotating magnetic core 22 to the rotating winding 21. The fixed magnetic core 11 surrounds an outer periphery of the rotating magnetic core 22 and forms a magnetic core window 40 with the rotating magnetic core 22. The fixed magnetic core 11 has a first end portion 1111 and a second end portion 1112 at opposite ends of the magnetic core window 40 along an axial direction X, the first end portion 1111 is spaced apart from the rotating magnetic core 22 along a radial direction Y to form a first air gap 30a, and the second end portion 1112 is spaced apart from the rotating magnetic core 22 along the radial direction Y to form a second air gap 30b. The magnetic core window 40 is located between the first air gap 30a and the second air gap 30b along the axial direction X and is connected to the first air gap 30a and the second air gap 30b. The rotating magnetic core 22 is linearly extended along the axial direction X. The rotating winding 21 is a planar winding. A portion of the rotating winding 21 is located in the magnetic core window 40, and the fixed winding 12 is located in the magnetic core window 40. The rotating winding 21 has the fixed winding 12 at opposite sides thereof along the axial direction X.

[0243] Based on the above structure, the first air gap 30a and the second air gap 30b are set to 0.5 mm, the number of turns of the fixed winding 12 is set to 6 turns, and the number of turns of the rotating winding 21 is set to 3 turns. The resolver 100 is simulated, as shown in FIG. 17, which is a simulation result diagram of the resolver 100 of FIG. 7. Thus, the following data can be obtained:

[0244] LP = 50.43 uH; M = 24.87 uH; LS = 12.49 uH; RP = 64.88 mΩ; RS = 14.03 mΩ; and the maximum current density is 1.07 x 108 A / m2.

[0245] Among them, LP is the self-inductance of the fixed winding 12, M is the mutual inductance between the rotating winding 21 and the fixed winding 12, LS is the self-inductance of the rotating winding 21, RP is the parasitic resistance of the fixed winding 12, and RS is the parasitic resistance of the rotating winding 21.

[0246] As the comparative example 1, as shown in FIG. 18, FIG. 18 is a simulation result diagram of the rotary transformer 100 of the comparative example 1. The fixed magnetic core 11 constitutes the magnetic core window 40, and the fixed winding 12 is arranged in the magnetic core window 40. The inner circumferential side of the fixed magnetic core 11 is provided with a notch, and the notch is distributed and communicated along the radial direction of the magnetic core window 40. The rotary winding 21 passes through the notch along the radial direction Y, and part of the rotary winding 21 is located in the magnetic core window 40. In the axial direction X, the fixed magnetic core 11 is spaced from the rotary winding 21 to form the air gap 30 at the two end faces opposite to the notch. Based on the above structure, the sensitivity of the inductance of the rotary transformer to the axial movement of the rotary part relative to the fixed part can also be reduced. In order to prevent the axial movement of the rotary winding 21 from interfering with the fixed magnetic core 11, the air gap 30 is set to 2.5 mm, the number of turns of the fixed winding 12 is set to 6 turns, and the number of turns of the rotary winding 21 is set to 3 turns. The rotary transformer 100 is simulated, as shown in FIG. 18. Thus, the following data can be obtained:

[0247] LP = 18.53 uH; M = 8.1 uH; LS = 4.25 uH; RP = 253.47 mΩ; RS = 87.54 mΩ. The current density is highest at 2.65 x 108 A / m2.

[0248] From the above two sets of simulation data, on the one hand, the air gap 30 of the rotary transformer 100 provided by the embodiment of the present application is small, and the inductance of the rotary transformer 100 is large, which is about 2.7 times the inductance in the comparative example 1.

[0249] Moreover, the equivalent resistance of the rotary transformer 100 provided by the embodiment of the present application is small, which is about 0.25 times the equivalent resistance in the comparative example 1. Based on this, the loss of the rotary transformer 100 provided by the embodiment of the present application is low.

[0250] Moreover, the current density of the rotary transformer 100 provided by the embodiment of the present application is smaller than the current density of the rotary transformer 100 in the comparative example 1, so that the heat generation of the rotary transformer 100 provided by the embodiment of the present application is more uniform, which helps to reduce the loss.

[0251] The above is only an optional embodiment of the present application and is not used to limit the present application. The present application can have various changes and variations for those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of claims of the present application.

Claims

1. A rotary transformer (100), wherein: include: A fixed part (10) comprising a fixed magnetic core (11) and a fixed winding (12) connected to the fixed magnetic core (11); A rotating part (20) includes a rotating magnetic core (22) and a rotating winding (21) connected to the rotating magnetic core (22); The fixed magnetic core (11) is sleeved on the outer periphery of the rotating magnetic core (22), and is surrounded by the rotating magnetic core (22) to form a magnetic core window (40), and at least a portion of the rotating winding (21) is arranged in the magnetic core window (40); the rotating magnetic core (22) is rotatable relative to the fixed magnetic core (11), and is spaced from the fixed magnetic core (11) in the radial direction (Y) to form an air gap (30), and the air gap (30) is connected to the opposite ends of the magnetic core window (40) in the axial direction (X).

2. The rotary transformer (100) according to claim 1, wherein The fixed magnetic core (11) is provided with a first end (1111) and a second end (1112) at opposite ends of the magnetic core window (40) along the axial direction (X), respectively. The air gap (30) is formed between the first end (1111) and the rotating magnetic core (22), and between the second end (1112) and the rotating magnetic core (22) along the radial direction (Y).

3. The rotary transformer (100) according to claim 1 or 2, wherein: In the axial direction (X), opposite ends of the rotating magnetic core (22) protrude outside the fixed magnetic core (11); Alternatively, in the axial direction (X), opposite ends of the fixed magnetic core (11) protrude outside the rotating magnetic core (22).

4. The rotary transformer (100) according to any one of claims 1 to 3, wherein: The rotating winding (21) is a planar winding.

5. The rotary transformer (100) according to any one of claims 1 to 4, wherein: The rotating winding (21) and the fixed winding (12) are arranged along the axial direction (X).

6. The rotary transformer (100) according to claim 5, wherein: There are a plurality of fixed windings (12), and the fixed windings (12) are respectively provided on two opposite sides of the rotating winding (21) along the axial direction (X).

7. The rotary transformer (100) according to any one of claims 1 to 6, wherein: The outer peripheral wall of the rotating magnetic core (22) is arranged to extend linearly along the axial direction (X).

8. The rotary transformer (100) according to any one of claims 1 to 7, wherein: The rotating magnetic core (22) includes a plurality of first magnetic cores (221); at least part of the first magnetic cores (221) is distributed on the rotating winding (21) along the circumferential direction (Z), and / or at least part of the first magnetic cores (221) is distributed on the rotating winding (21) along the axial direction (X), and / or at least part of the first magnetic cores (221) is distributed on the rotating winding (21) along the radial direction (Y).

9. The rotary transformer (100) according to any one of claims 1 to 8, wherein: The rotating winding (21) is provided with a first limiting groove (201), and the rotating magnetic core (22) is limited in the first limiting groove (201) along the radial direction (Y).

10. The rotary transformer (100) according to claim 9, wherein: The rotating winding (21) is provided with a plurality of first limiting grooves (201), and at least some of the first limiting grooves (201) are spaced apart along the circumferential direction (Z); the rotating magnetic core (22) comprises a plurality of first magnetic cores (221), and the first magnetic cores (221) are respectively limited in the corresponding first limiting grooves (201) along the radial direction (Y) and the circumferential direction (Z).

11. The rotary transformer (100) according to claim 10, wherein: The rotating winding (21) comprises a middle portion (211), a connecting portion (213) and an annular portion (212); the annular portion (212) surrounds the outer circumference of the middle portion (211) and is spaced apart from the middle portion (211); the connecting portion (213) is connected between the annular portion (212) and the middle portion (211); there are multiple connecting portions (213), and the multiple connecting portions (213) are spaced apart along the circumferential direction (Z); the annular portion (212), the middle portion (211) and two adjacent connecting portions (213) are arranged to form the first limiting groove (201).

12. The rotary transformer (100) according to any one of claims 1 to 11, wherein: The rotating part (20) further comprises a rotating shaft structure (23), and the rotating magnetic core (22) is mounted on the rotating winding (21) via the rotating shaft structure (23).

13. The rotary transformer (100) according to claim 12, wherein: The rotating shaft structure (23) is mounted on the rotating winding (21), and the rotating shaft structure (23) includes a first limiting portion (2312) and a second limiting portion (2322), wherein the first limiting portion (2312) and the second limiting portion (2322) are respectively arranged on opposite sides of the rotating winding (21) along the axial direction (Z), and the rotating magnetic core (22) includes a first magnetic core (221); The first magnetic core (221) passes through the rotating winding (21) along the axial direction (X) and is limited between the first limiting portion (2312) and the second limiting portion (2322) along the axial direction (X); and / or the first magnetic core (221) is respectively provided on two opposite sides of the rotating winding (21) along the axial direction (X), and the first limiting portion (2312) and the second limiting portion (2322) respectively limit the corresponding first magnetic core (221) on the rotating winding (21) along the axial direction (X).

14. The rotary transformer (100) according to claim 13, wherein: The rotating shaft structure (23) includes a first rotating shaft (231) and a second rotating shaft (232), wherein the first rotating shaft (231) includes a first shaft body (2311) and a first limiting portion (2312) connected to the first shaft body (2311), and the second rotating shaft (232) includes a second shaft body (2321) and a second limiting portion (2322) connected to the second shaft body (2321); the first shaft body (2311) and the second shaft body (2321) are connected to each other so as to be mounted on the rotating winding (21).

15. The rotary transformer (100) according to claim 13 or 14, wherein: The rotating shaft structure (23) further includes a third limiting portion (2313); A second limiting groove (202) is formed between the third limiting portion (2313) and the first limiting portion (2312), and / or between the third limiting portion (2313) and the second limiting portion (2322), and the first magnetic core (221) is limited in the second limiting groove (201) along the circumferential direction (Z).

16. The rotary transformer (100) according to any one of claims 1 to 15, wherein: The fixed magnetic core (11) includes a plurality of second magnetic cores (111); at least part of the second magnetic cores (111) are arranged along a circumferential direction (Z), and / or at least part of the second magnetic cores (111) are arranged along an axial direction (X), and / or at least part of the second magnetic cores (111) are arranged along a radial direction (Y).

17. A motor (1000), wherein: The rotary transformer (100) comprises the rotary transformer (100) according to any one of claims 1 to 16.

18. An electric drive system, wherein: It comprises a motor and a rotary transformer (100) according to any one of claims 1 to 16, wherein the rotor (200) of the motor (1000) is fixedly connected to the rotating part (20).

19. An electric device, wherein: The rotary transformer (100) comprises the rotary transformer (100) according to any one of claims 1 to 16; or, the motor (1000) comprises the motor (1000) according to claim 17; or, the electric drive system comprises the electric drive system according to claim 18.

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