Rotary transformer, motor, electric driving system and electric equipment

Abstract

The invention is suitable for the technical field of measurement, and provides a rotary transformer, a motor, an electric driving system and electric equipment, the electric equipment comprises the electric driving system, the motor or the rotary transformer, the electric driving system comprises the rotary transformer, the motor comprises the rotary transformer, and the rotary transformer comprises a fixed part and a rotary part. The fixed part comprises a fixed magnetic core and a fixed winding connected to the fixed magnetic core; the rotating part comprises a rotating magnetic core and a rotating winding connected to the rotating magnetic core; the fixed magnetic core is arranged on the periphery of the rotary magnetic core in a sleeving mode, a magnetic core window is defined by the fixed magnetic core and the rotary magnetic core, and at least part of the rotary winding is arranged in the magnetic core window. The rotating magnetic core can rotate relative to the fixed magnetic core, and the rotating magnetic core and the fixed magnetic core are spaced in the radial direction to form an air gap which is communicated with the two opposite ends of the magnetic core window in the axial direction. In this way, the inductance value fluctuation of the rotary transformer is small, and the sensitivity of the rotary transformer to axial movement of a rotating part is reduced.

Description

Technical Field

[0001] The present application belongs to the field of measurement technology, and more specifically, relates to a rotary transformer, a motor, an electric drive system, and an electric device. Background Art

[0002] In the related art, a rotary transformer may include a fixed portion and a rotating portion, and the rotating portion is configured to be rotatable relative to the fixed portion.

[0003] As the rotating part rotates relative to the fixed part, there's a risk of axial movement. Resolvers are highly sensitive to this axial movement, affecting the resolver's inductance and causing significant fluctuations. This results in poor rotational stability during operation, impacting the resolver's measurement accuracy. Summary of the Invention

[0004] In view of the above problems, embodiments of the present application 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.

[0005] In a first aspect, an embodiment of the present application provides a rotary transformer, comprising:

[0006] a fixed part comprising a fixed magnetic core and a fixed winding connected to the fixed magnetic core;

[0007] The rotating part includes a rotating magnetic core and a rotating winding connected to the rotating magnetic core; the fixed magnetic core is arranged on the outer periphery of the rotating magnetic core, and forms a magnetic core window with the rotating magnetic core, and at least a part of the rotating winding is arranged in the magnetic core window; the rotating magnetic core can rotate relative to the fixed magnetic core, and is radially spaced from the fixed magnetic core to form an air gap, and the air gap is connected to the opposite ends of the magnetic core window along the axial direction.

[0008] The rotary transformer provided in the embodiment of the present application forms an air gap by radially spacing the fixed magnetic core and the rotating magnetic core, and the air gap is respectively connected 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 radial size of the air gap does not change. This basically does not change the main magnetic circuit of the fixed magnetic core and the rotating magnetic core, thereby reducing the inductance fluctuation of the rotary transformer, reducing the sensitivity of the rotary transformer to axial movement of the rotating part, and helping to improve the rotational stability of the rotary transformer and improve the measurement accuracy of the rotary transformer.

[0009] In some embodiments, the fixed magnetic core is provided with a first end and a second end at opposite ends of the magnetic core window along the axial direction, and an air gap is formed radially between the first end and the rotating magnetic core, and between the second end and the rotating magnetic core.

[0010] This helps reduce the resolver's sensitivity to axial movement, improves its rotational stability, and enhances its measurement accuracy. Furthermore, it helps reduce the radial dimensions of the rotating magnetic core, thereby reducing its volume and weight, making it suitable for high-speed rotation applications. This allows the resolver to be used in high-speed rotation applications.

[0011] In some embodiments, opposite ends of the rotating magnetic core protrude out of the fixed magnetic core in the axial direction;

[0012] Alternatively, in the axial direction, opposite ends of the fixed magnetic core protrude outside the rotating magnetic core.

[0013] In this way, the fluctuation of the inductance can be further reduced, thereby further reducing the sensitivity of the rotary transformer to axial movement.

[0014] In some embodiments, the rotating winding is a planar winding.

[0015] This facilitates the layout of the rotating and stationary windings within the core window, improving the space utilization of the core window and contributing to a miniaturized and lightweight design of the resolver. Furthermore, it helps keep the rotating winding away from the air gap, thereby reducing the impact of the space harmonic magnetic field at the air gap on the rotating winding and reducing eddy current losses caused by the space harmonic magnetic field in the rotating winding. This improves the rotational stability of the resolver and enhances the measurement accuracy of the resolver.

[0016] In some embodiments, the rotating winding and the stationary winding are arranged axially.

[0017] This arrangement, on the one hand, facilitates the separation of the rotating winding from the air gap, thereby reducing the impact of the space harmonic magnetic field at the air gap on the rotating winding, reducing eddy current losses caused by the space harmonic magnetic field in the rotating winding, and thus improving the rotational stability and measurement accuracy of the resolver. Furthermore, it allows the rotating winding and the stationary winding to be axially close together, which helps to increase the electromagnetic coupling coefficient between the rotating winding and the stationary winding, thereby reducing losses in the rotating winding, improving the rotational stability and measurement accuracy of the resolver.

[0018] In some embodiments, there are multiple fixed windings, and a fixed winding is provided on two opposite sides of the rotating winding along the axial direction.

[0019] Such an arrangement can improve the coupling coefficient between the rotating winding and the fixed winding, thereby reducing the loss of the rotating winding, improving the rotational stability of the rotary transformer, and improving the measurement accuracy of the rotary transformer.

[0020] In some embodiments, the outer peripheral wall of the rotating magnetic core is extended in an axial straight line.

[0021] This arrangement enables the rotating core to be miniaturized and lightweight, and thus enables the rotating core to rotate at high speed, that is, the rotary transformer can be used in high-speed rotation applications.

[0022] In some embodiments, the rotating magnetic core includes multiple first magnetic cores; at least some of the first magnetic cores are distributed circumferentially on the rotating winding, and / or, at least some of the first magnetic cores are distributed axially on the rotating winding, and / or, at least some of the first magnetic cores are distributed radially on the rotating winding.

[0023] By adopting the above technical solution, multiple first magnetic cores are distributed on the rotating winding to form a rotating magnetic core, which helps to reduce the weight of the rotating magnetic core and enables the rotary transformer to be used in high-speed rotation applications.

[0024] 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.

[0025] The first limiting groove limits the rotating magnetic core in the radial direction, so that the first limiting groove can resist the centrifugal force during the rotation of the rotating magnetic core, thereby improving the stability of the rotating part during the rotation process, so that the rotary transformer can be used in high-speed rotation occasions.

[0026] In some embodiments, the rotating winding is provided with a plurality of first limiting grooves, at least some of which are spaced apart circumferentially; the rotating magnetic core includes a plurality of first magnetic cores, which are respectively limited in the corresponding first limiting grooves in the radial and circumferential directions.

[0027] By adopting the above technical solution, on the one hand, each first magnetic core is confined within a corresponding first limiting groove, and multiple first limiting grooves are spaced apart along the circumferential direction, thereby enabling the multiple first magnetic cores to be spaced apart. This helps reduce the weight of the rotating magnetic core, facilitates the application of the rotating magnetic core in high-speed rotation applications, and thus enables the use of the rotary transformer in high-speed rotation applications. On the other hand, the first magnetic core is confined within the first limiting grooves in both the radial and circumferential directions, allowing the rotating magnetic core to be securely mounted on the rotating winding, alleviating the problem of the rotating magnetic core being thrown out during high-speed rotation due to high eccentricity, and improving the stability of the high-speed rotation of the rotary transformer.

[0028] In some embodiments, the rotating part further includes a rotating shaft structure, and the rotating magnetic core is mounted on the rotating winding via the rotating shaft structure.

[0029] The rotating core is mounted on the rotating winding via a rotating shaft structure, eliminating the need for additional design to mount or position the rotating winding. This allows the rotating core to be very simple and compact, reducing its weight and enabling high-speed rotation relative to the fixed core, thus enabling the resolver to be used in high-speed applications.

[0030] In some embodiments, the rotating shaft structure is mounted 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 provided on opposite sides of the rotating winding along the axial direction, and the rotating magnetic core includes a first magnetic core;

[0031] The first magnetic core passes through the rotating winding axially and is axially limited between the first limiting portion and the second limiting portion; and / or, the first magnetic core is respectively provided on opposite sides of the rotating winding along the axial direction, and the first limiting portion and the second limiting portion respectively limit the corresponding first magnetic core axially on the rotating winding.

[0032] Such an arrangement enables the rotating shaft structure to mount the rotating magnetic core on the rotating winding, so that the rotating magnetic core is at least axially limited on the rotating winding.

[0033] In some embodiments, the rotating shaft structure includes a first rotating shaft and a second rotating shaft, the first rotating shaft includes a first shaft body and a first limiting portion connected to the first shaft body, and the second rotating shaft includes a second shaft body and a second limiting portion connected to the second shaft body; the first shaft body and the second shaft body are connected to each other to be installed on the rotating winding.

[0034] Such an arrangement makes it very convenient and easy to install the rotating magnetic core on the rotating winding using the rotating shaft structure.

[0035] In some embodiments, the rotating shaft structure further includes a third limiting portion;

[0036] A second limiting groove is formed between the third limiting portion and the first limiting portion, and / or between the third limiting portion and the second limiting portion, and the first magnetic core is limited in the second limiting groove along the circumferential direction.

[0037] Such an arrangement enables the rotating shaft structure to limit the circumferential position of the rotating magnetic core, thereby achieving a stable installation effect of the rotating part, which is beneficial for the application of the rotating part in high-speed rotation occasions.

[0038] In some embodiments, the fixed magnetic core includes a plurality of second magnetic cores; at least some of the second magnetic cores are arranged circumferentially, and / or at least some of the second magnetic cores are arranged axially, and / or at least some of the second magnetic cores are arranged radially.

[0039] 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 and realize a lightweight design of the rotary transformer.

[0040] In a second aspect, an embodiment of the present application provides a motor including a rotary transformer.

[0041] The motor provided in the embodiment of the present application adopts the above-mentioned rotary transformer, so that the inductance of the rotary transformer is less sensitive to axial movement, thereby improving the rotational stability of the rotary transformer and the measurement accuracy of the rotary transformer to accurately control the operation of the motor.

[0042] In a third aspect, an embodiment of the present application provides an electric drive system, including a motor and a rotary transformer, wherein the rotor of the motor is fixedly connected to the rotating part.

[0043] The electric drive system provided in the embodiment of the present application adopts the rotary transformer mentioned above, so that the electric drive system can output power stably and efficiently.

[0044] In a fourth aspect, an embodiment of the present application provides an electric device, including a rotary transformer, a motor or an electric drive system.

[0045] The electric device provided in the embodiment of the present application adopts the above-mentioned rotary transformer, motor or electric drive system, so that the electric device can output power stably and efficiently.

[0046] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0048] Figure 1 A schematic diagram of a vehicle provided for some embodiments of the present application;

[0049] Figure 2 A partial schematic diagram of a motor provided in some embodiments of the present application;

[0050] Figure 3 Partial schematic diagram of a motor provided in some other embodiments of the present application;

[0051] Figure 4 A partial schematic diagram of a motor provided in some embodiments of the present application;

[0052] Figure 5 A partial schematic diagram of a motor provided in some further embodiments of the present application;

[0053] Figure 6 Partial schematic diagram of a motor provided in some other embodiments of the present application;

[0054] Figure 7 A schematic diagram of the structure of a rotary transformer provided in some embodiments of the present application;

[0055] Figure 8 for Figure 7 Schematic diagram of the decomposition;

[0056] Figure 9 for Figure 7 Cross-sectional view along AA;

[0057] Figure 10 for Figure 9 Enlarged view of point B in the middle;

[0058] Figure 11 Cross-sectional views of rotary transformers provided in other embodiments of the present application;

[0059] Figure 12 A cross-sectional view of a rotary transformer provided in some other embodiments of the present application;

[0060] Figure 13 A cross-sectional view of a rotary transformer provided in some further embodiments of the present application;

[0061] Figure 14 for Figure 7 A schematic diagram of the rotating portion of a rotary transformer is provided;

[0062] Figure 15 for Figure 14 Schematic diagram of the decomposition;

[0063] Figure 16 An exploded schematic diagram of a rotary transformer provided in some other embodiments of the present application;

[0064] Figure 17 A simulation diagram of a rotary transformer provided in some embodiments of the present application;

[0065] Figure 18 Schematic diagram of the simulation of the rotary transformer of comparative example 1.

[0066] Among them, the reference numerals in the figures are:

[0067] 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; 1112-second end; 1113-first peripheral part; 1114-second peripheral part; 12-fixed winding; 20-rotating part; 201-first limiting groove; 202-second limiting groove; 2 03-third end face; 21-rotating winding; 211-middle part; 212-annular part; 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

[0068] 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.

[0069] 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.

[0070] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0071] In the description of this application, "a plurality of" means more than two, and unless otherwise specifically defined, "more than two" includes two. Accordingly, "a plurality of groups" means more than two groups, including two groups.

[0072] In the description of this application, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0073] In the description of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the related objects are in an "or" relationship.

[0074] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

[0075] In related technologies, a resolver is an electromagnetic sensor, also known as a synchronous resolver. It is a small AC motor used to measure angles and is used to measure the angular displacement and angular velocity of a rotating object.

[0076] A rotary transformer may generally include a fixed portion and a rotating portion, wherein the rotating portion is configured to be rotatable relative to the fixed portion. Specifically, the fixed portion includes a fixed winding, and the rotating portion includes a rotating winding, wherein the rotating winding is configured to be rotatable relative to the fixed winding.

[0077] As the rotating part rotates relative to the fixed part, there's a risk of axial movement. Resolvers are highly sensitive to this axial movement, affecting the resolver's inductance and causing significant fluctuations. This results in poor rotational stability during operation, impacting the accuracy of the resolver's measurements and output data.

[0078] 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 setting a fixed magnetic core and a rotating magnetic core, and the fixed magnetic core and the rotating magnetic core are radially spaced to form an air gap, and the air gap is respectively connected 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 radial size of the air gap does not change, which makes the main magnetic circuit of the fixed magnetic core and the rotating magnetic core basically unchanged, so that the inductance fluctuation of the rotating transformer is small, and the sensitivity of the rotating transformer to the axial movement of the rotating part is reduced, which helps to improve the rotational stability of the rotating transformer and thus improve the measurement accuracy of the rotating transformer.

[0079] It should be noted that the air gap refers to the distance between the fixed part and the rotating part, which allows the rotating part to rotate relative to the fixed part. In other words, due to the existence of the air gap, the rotating part can rotate relative to the fixed part without interference.

[0080] In some embodiments, a rotary transformer may be used in an electrically powered device.

[0081] Electric devices may include, but are not limited to, electric toys, electric tools, electric bicycles, electric motorcycles, ships, spacecraft, etc. Electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, etc.

[0082] Electric equipment can also be vehicles or vehicle chassis. Based on the power source, vehicles can be fuel-powered, gas-powered, or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles, or extended-range vehicles. Based on the drive mode, vehicles can be front-wheel drive, rear-wheel drive, or four-wheel drive.

[0083] For the convenience of explanation, some embodiments of the present application are described using the electric device as a vehicle as an example.

[0084] See also Figure 1 , Figure 1 Schematic diagram of a vehicle provided for some embodiments of the present application. The vehicle is provided with an electric drive system, which can be located at the bottom, front, or rear of the vehicle to provide power to the vehicle. In other words, the vehicle includes an electric drive system.

[0085] A vehicle has an engine cabin and a driver's cabin. The engine cabin houses the vehicle's electric drive system, among other things, while the driver's cabin provides operating and seating space for the driver and passengers. When the vehicle is front-wheel drive, the engine cabin is located at the front of the vehicle, i.e., the engine cabin is the front cabin. When the vehicle is rear-wheel drive, the engine cabin is located at the rear of the vehicle, i.e., the engine cabin is the rear cabin. When the vehicle is four-wheel drive, the engine cabin is divided into a front cabin and a rear cabin, with the front cabin located at the front of the vehicle and the rear cabin located at the rear. The driver's cabin is located between the front and rear of the vehicle.

[0086] The electric drive system is the vehicle's power system, that is, the vehicle's electric drive system. The electric drive system is used to convert electrical energy into mechanical energy to drive the vehicle's starting, navigation, driving, and working power needs during driving.

[0087] In some embodiments, a portion of the electric drive system may be disposed within the cabin and another portion may be disposed at the bottom of the vehicle.

[0088] In some embodiments, the electric drive system may include a motor 1000, which serves as a power source for the electric drive system. It is understood that the electric drive system is not limited to applications in vehicles, but may also be applied to other electric devices requiring power output.

[0089] In some embodiments, the electric drive system may further include a battery 2000 , which is used to supply power to the motor 1000 , for example, for starting, navigating, and driving the vehicle.

[0090] In some embodiments, the electric drive system may 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. 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 motor 1000 to control the operation of the motor 1000, thereby achieving drive control of the vehicle. For example, the control system 3000 can control the starting, speed change, and stopping of the motor 1000 to drive the vehicle to start, change speed, and stop.

[0091] The control system 3000 can also be used to convert AC power into DC power. For example, when the vehicle recovers kinetic energy, the motor 1000 can convert the mechanical energy that drives its rotation into AC power, and the control system 3000 can convert the AC power into DC power and recharge it into the battery 2000.

[0092] In some embodiments, the electric drive system may further include a gearbox 4000, which is connected to the motor 1000 to achieve torque change of the motor 1000. The gearbox 4000, also known as a transmission, is a mechanism used to change the speed and torque from the engine. It can change the output shaft and input shaft transmission ratio in a fixed or step-by-step manner.

[0093] In some embodiments, the battery 2000 can be integrated with the motor 1000 to form an electric drive system. The control system 3000 can also be integrated with the motor 1000 to form an electric drive system. The gearbox 4000, the control system 3000 and the motor 1000 can also be integrated to form an electric drive system. The gearbox 4000, the control system 3000, the battery 2000 and the motor 1000 can also be integrated to form an electric drive system. Of course, in some embodiments, the electric drive system can also integrate other structures, such as cooling oil circuits, etc.

[0094] Please also refer to Figures 2 to 6 , Figures 2 to 6 The structural schematic diagrams of the motor 1000 provided in multiple embodiments of the present application are respectively shown. The motor 1000, also known as an electric motor, is a device that converts electrical energy into mechanical energy. The motor 1000 may include a rotor 200, a stator 300 and a motor shaft 400. Specifically, the motor 1000 uses the energized coils of the stator 300 to generate a rotating magnetic field and act on the rotor 200 to form a magneto-electrodynamic rotational torque. The fixed part of the motor 1000 is called the stator 300; and the rotating part of the motor 1000 is called the rotor 200.

[0095] It should be noted 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, which is also the axial direction (X) of the motor shaft 400, i.e., 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, which is also the radial direction (Y) of the motor shaft 400, i.e., the radial direction of the motor shaft 400. The circumferential direction (Z) of the motor 1000 refers to the circumferential direction (Z) of the rotor 200, which is also the circumferential direction (Z) of the motor shaft 400, i.e., the circumferential direction of the motor shaft 400.

[0096] The motor shaft 400 is a shaft-shaped structure used to output power in the motor 1000. The rotor 200 is fixedly connected to the motor shaft 400, so that the motor shaft 400 can rotate under the drive of the rotor 200 to output power.

[0097] The stator 300 is sleeved on the outer circumference of the motor shaft 400, and the stator 300 and the motor shaft 400 can rotate relative to each other, thereby enabling the stator 300 and the rotor 200 to rotate relative to each other. For example, in some embodiments, the stator 300 can be supported on the motor shaft 400 by bearings.

[0098] Among them, the energized coil on the stator 300 can generate a magnetic field when energized, and act on the rotor 200 to form a magneto-electrical rotational torque, thereby realizing the rotation of the rotor 200, and then driving the motor shaft 400 to rotate together, so as to output power through the motor shaft 400.

[0099] In some embodiments, in the motor 1000 , the number of the rotor 200 may be one or more, and the number of the stator 300 may also be one or more.

[0100] The motor 1000 can be divided into a radial motor and an axial motor.

[0101] The radial motor refers to a motor 1000 in which the stator 300 and the rotor 200 are arranged along the radial direction Y. For example, in some embodiments, Figure 2 As shown, the stator 300 is located at the outer periphery of the rotor 200 , that is, the stator 300 is sleeved on the outer periphery of the rotor 200 ; alternatively, the rotor 200 may also be located at the outer periphery of the stator 300 , that is, the rotor 200 is sleeved on the outer periphery of the stator 300 .

[0102] The axial motor is a motor 1000 in which the stator 300 and the rotor 200 are arranged along the axial direction X, such as Figures 3 to 6 Specifically, the rotor 200 and the stator 300 are sequentially distributed along the axial direction X, so that the rotor 200 is located on the side of the stator 300 along the axial direction X, so that the stator 300 drives the rotor 200 to rotate, thereby driving the motor shaft 400 to rotate.

[0103] In other embodiments, see Figure 3 There can be one rotor 200 and one stator 300 . The stator 300 is located on one side of the rotor 200 in the axial direction X. The motor 1000 has a simple structure and a small size.

[0104] In some other embodiments, see Figure 4 The motor 1000 includes two stators 300 and a rotor 200. The two stators 300 are located on opposite sides of the rotor 200 in the axial direction X. In this way, the two stators 300 can drive the same rotor 200 to rotate to improve the output power, and the structure of this motor 1000 is more compact.

[0105] In some further embodiments, see Figure 5 The motor 1000 includes two rotors 200 and a stator 300. The two rotors 200 are located on opposite sides of the stator 300 in the axial direction X, and the two rotors 200 are fixedly connected to the motor shaft 400. In this way, one stator 300 can be used to drive the two rotors 200 to rotate, and drive the same motor shaft 400 to rotate, so as to improve the output power, and the structure of this motor 1000 is more compact.

[0106] In some other embodiments, see Figure 6 The motor 1000 includes a plurality of rotors 200 and a plurality of stators 300 , which are arranged along the axial direction X. A stator 300 is provided between two adjacent rotors 200 along the axial direction X, and a rotor 200 is provided between two adjacent stators 300 along the axial direction X. The plurality of stators 300 drive the plurality of rotors 200 to rotate, thereby driving the motor shaft 400 to rotate, thereby increasing the output power.

[0107] In some embodiments, please refer to Figures 2 to 8 , Figure 7 This is a three-dimensional structural diagram of a rotary transformer 100 provided in some embodiments of the present application. Figure 8 for Figure 7 The electric drive system may further include a rotary transformer 100 , which may be used to measure information such as the angular velocity and angular displacement of the motor shaft 400 .

[0108] In some embodiments, please refer to Figures 2 to 8 The rotary transformer 100 includes a fixed portion 10 and a rotating portion 20, which is configured to be rotatable relative to the fixed portion 10. Specifically, the fixed portion 10 includes a fixed winding 12, and the rotating portion 20 includes a rotating winding 21, which is configured to be rotatable relative to the fixed winding 12.

[0109] The stationary winding 12 refers to a winding in the stationary part 10 of the resolver 100 , and the rotating winding 21 refers to a winding in the rotating part 20 of the resolver 100 .

[0110] 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 mentioned below. As an example, the motor shaft 400 is fixedly connected to the rotating shaft structure 23.

[0111] Specifically, the fixed winding 12 can serve as the primary winding of the rotary transformer 100, receiving an excitation voltage. The rotating winding 21 can serve as the secondary winding of the rotary transformer 100, generating an induced voltage through electromagnetic coupling with the primary winding. The induced voltage of the rotating winding 21 can vary with the angular displacement of the rotating winding, thereby measuring information such as the angular displacement and angular velocity of the rotor 200, which is fixedly connected to the rotating portion 20, and thus enabling measurement of the motor 1000.

[0112] The control system 3000 can be electrically connected to the stationary winding 12 and the stator 300. The control system 3000 can provide an excitation voltage to the stationary winding 12, causing it to generate a magnetic field. The rotating winding 21 can rotate along with the rotor 200 of the motor 1000, and the rotating winding 21 is electromagnetically coupled to the stationary winding 12, generating an induced voltage on the rotating winding 21. Thus, information such as the angular displacement and angular velocity of the rotor 200 can be measured, and the control system 3000 can control the operation of the motor 1000 based on this information.

[0113] The resolver 100 has a central axis L, about which the rotating portion 20 can rotate relative to the fixed portion 10. The resolver 100 also has an axial direction (X), a circumferential direction (Z), and a radial direction (Y). The axial direction (X) of the resolver 100 is parallel to the central axis (L). The axial direction (X) of the resolver 100 refers to the axial direction (X) of the circle defined by the rotating portion 20 when rotating relative to the fixed portion 10. The circumferential direction (Z) of the resolver 100 is the circumferential direction of the circle defined by the rotating portion 20 when rotating relative to the fixed portion 10, that is, the direction of rotation of the rotating portion 20. The radial direction (Y) of the resolver 100 is the radial direction of the circle defined by the rotating portion 20 when rotating relative to the fixed portion 10.

[0114] The axial direction X of the resolver 100 is the axial direction X of the motor 1000 and is hereinafter referred to as the axial direction X. The circumferential direction Z of the resolver 100 is the circumferential direction Z of the motor 1000 and is hereinafter referred to as the circumferential direction Z. The radial direction Y of the resolver 100 is the radial direction Y of the motor 1000 and is hereinafter referred to as the radial direction Y.

[0115] Please also refer to Figures 7 to 10 , and combined with other drawings. Among them, Figure 9 for Figure 7 Cross-section view along AA, Figure 10 for Figure 9 Enlarged view of point B in the figure. The rotary transformer 100 provided in the embodiment of the present application includes a fixed part 10 and a rotating part 20. The fixed part 10 includes a fixed magnetic core 11 and a fixed winding 12 connected to the fixed magnetic core 11. The rotating part 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 is surrounded by the rotating magnetic core 22 to form a core window 40, and at least a portion of the rotating winding 21 is arranged in the core window 40. The rotating magnetic core 22 is capable of rotating 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 connected to the opposite ends of the core window 40 along the axial direction X.

[0116] The fixed portion 10 is a portion that does not rotate in the resolver 100. Specifically, the fixed winding 12 and the fixed core 11 are portions that do not rotate in the resolver 100.

[0117] Rotating portion 20 is the rotatable portion of resolver 100 . Resolver 100 is rotatable relative to stationary portion 10 about a central axis L. Specifically, rotating winding 21 and rotating magnetic core 22 are the rotatable portions of resolver 100 , and both are rotatable about central axis L.

[0118] Both the fixed magnetic core 11 and the rotating magnetic core 22 are components with high magnetic permeability. The fixed winding 12 receives an excitation voltage and is capable of generating a magnetic field. The fixed winding 12 and the rotating winding 21 can achieve electromagnetic coupling, causing the rotating winding 21 to generate an induced voltage. Both the fixed magnetic core 11 and the rotating magnetic core 22 are excited to generate a magnetic field. Due to the high magnetic permeability of the fixed magnetic core 11 and the rotating magnetic core 22, the magnetic field of the rotary transformer 100 is concentrated, thereby improving the electromagnetic coupling of the rotary transformer 100, thereby improving the rotational stability of the rotary transformer 100 and improving the measurement accuracy of the rotary transformer 100. Specifically, the fixed magnetic core 11 and the rotating magnetic core 22 are arranged to form a core window 40, and at least a portion of the rotating winding 21 is located within the core window 40, allowing the fixed winding 12 and the rotating winding 21 to achieve electromagnetic coupling with a high coupling capability in the core window 40, thereby achieving high-efficiency voltage conversion and improving the rotational stability of the rotary transformer 100.

[0119] The core window 40 is a window formed by the stationary core 11 and the rotating core 22 for electromagnetic coupling between the stationary winding 12 and the rotating winding 21. The core window 40 is a space defined by the main magnetic path of the stationary winding 12 and the rotating winding 21, and the main magnetic path passes through the air gap 30.

[0120] The fixed magnetic core 11 and the rotating magnetic core 22 can be made of at least one of silicon steel sheets, ferrite, microcrystals, ultramicrocrystals, and permalloy materials, so that the fixed magnetic core 11 and the rotating magnetic core 22 have higher magnetic conductivity.

[0121] like Figure 9 and Figure 10 As shown, the rotating core 22 and the fixed core 11 are spaced apart in the radial direction Y to form an air gap 30 , and the core window 40 has air gaps 30 at opposite ends along the axial direction X. The air gap 30 and the core window 40 are distributed along the axial direction X and are connected.

[0122] For ease of description, the air gaps 30 at opposite ends of the core window 40 along the axial direction X are defined as a first air gap 30a and a second air gap 30b, respectively. It will be appreciated that the rotating magnetic core 22 and the stationary magnetic core 11 are spaced apart in the radial direction Y to form a first air gap 30a, and spaced apart in the radial direction Y to form a second air gap 30b. The first air gap 30a and the second air gap 30b are spaced apart along the axial direction X. In the axial direction X, the core window 40 is located between the first air gap 30a and the second air gap 30b. The first air gap 30a and the core window 40 are spaced apart and connected along the axial direction X, while the second air gap 30b and the window are spaced apart and connected along the axial direction X.

[0123] The rotary transformer 100 provided in the embodiment of the present application is provided with a fixed magnetic core 11 and a rotating magnetic core 22, and the fixed magnetic core 11 and the rotating magnetic core 22 are separated along the radial direction Y to form an air gap 30, and the air gap 30 is respectively connected to the opposite ends of the magnetic core window 40 along the axial direction X, so that when the rotating part 20 moves relative to the fixed part 10 along the axial direction X, the size of the air gap 30 along the radial direction Y does not change. This makes the main magnetic circuit of the fixed magnetic core 11 and the rotating magnetic core 22 basically unchanged, so that the inductance fluctuation of the rotary transformer 100 is small, and the sensitivity of the rotary transformer 100 to the movement of the rotating part 20 relative to the fixed part 10 along the axial direction X is reduced, which helps to improve the rotational stability of the rotary transformer 100 and thereby improve the measurement accuracy of the rotary transformer 100.

[0124] In addition, the size of the air gap 30 in the radial direction Y is not affected by the axial movement of the rotating part 20 in the axial direction X, so that the air gap 30 does not need to leave space in the radial direction Y for the axial movement of the rotating part 20 in the axial direction X. This allows the size of the air gap 30 in the radial direction Y to be made very small, thereby increasing the inductance of the rotary transformer 100 and helping to improve the measurement accuracy of the rotary transformer 100.

[0125] Furthermore, by providing the first and second air gaps 30a, 30b at opposite ends of the core window 40 along the axial direction X, at least a portion of the rotating winding 21 is located within the core window 40, thereby positioning at least a portion of the rotating winding 21 between the first and second air gaps 30a, 30b along the axial direction X. Furthermore, the first and second air gaps 30a, 30b are formed by spacing the fixed core 11 and the rotating core 22 along the radial direction Y. This improves the current distribution in the rotating winding 21, ensuring more uniform heating and reducing losses. Furthermore, it helps keep the rotating winding 21 away from the air gap 30, thereby reducing eddy current losses caused by the space harmonic magnetic field at the air gap 30. This helps improve the measurement accuracy of the resolver 100.

[0126] In some embodiments, see Figure 7 and Figure 8 The fixed winding 12 is located in the core window 40 , which is beneficial for the fixed winding 12 and the rotating winding 21 to achieve electromagnetic coupling.

[0127] In some embodiments, please refer to Figures 7 to 10 , and in conjunction with other drawings. 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. An air gap 30 is formed between the first end 1111 and the rotating magnetic core 22 along the radial direction Y, and an air gap 30 is formed between the second end 1112 and the rotating magnetic core 22 along the radial direction Y.

[0128] like Figure 9 and Figure 10 As shown, the inner circumference of the fixed magnetic core 11 is recessed, so that the inner circumference of the fixed magnetic core 11 protrudes to form a first end 1111 and a second end 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 enclose a magnetic core window 40, so that the first end 1111 and the second end 1112 are two opposing solid walls of the magnetic core window 40 along the axial direction X. The first end 1111 is disposed around the outer circumference of the rotating magnetic core 22, and the second end 1112 is disposed around the outer circumference of the rotating magnetic core 22.

[0129] like Figure 9 As shown, taking the portion of the fixed core 11 located on the right side of the rotating core 22 as an example, this portion of the fixed core 11 is roughly "U"-shaped, and the first end 1111 and the second end 1112 are respectively the two opposite ends of the "U"-shaped structure.

[0130] The inner circumferential wall of the first end portion 1111 is provided with a first end face 101, the inner circumferential wall of the second end portion 1112 is provided with a second end face 102, and the outer circumferential wall of the rotating magnetic core 22 is provided with a third end face 203. The first end face 101 and the third end face 203 are spaced along the radial direction Y to form a first air gap 30a, and the second end face 102 and the third end face 203 are spaced along the radial direction Y to form a second air gap 30b.

[0131] By providing the first end 1111 and the second end 1112, the fixed magnetic core 11 and the rotating magnetic core 22 can enclose a magnetic core window 40, and air gaps 30 are formed along the radial direction Y, connecting the opposite ends of the magnetic core window 40 along the axial direction X. This helps reduce the sensitivity of the resolver 100 to axial motion in the X direction, improves the rotational stability of the resolver 100, and thereby enhances the measurement accuracy of the resolver 100.

[0132] Furthermore, by forming a first end portion 1111 and a second end portion 1112 on the inner circumference of the fixed magnetic core 11, the magnetic core window 40 is positioned substantially within the interior space of the fixed magnetic core 11. This facilitates the close proximity of the inner circumferential wall of the fixed magnetic core 11 in the radial direction Y to the outer circumferential wall of the rotating magnetic core 22, thereby reducing the size of the air gap 30 in the radial direction Y. This eliminates the need for additional processing of the rotating magnetic core 22 to reduce the air gap 30, thereby facilitating a reduction in the radial direction Y of the rotating magnetic core 22 and its volume and weight. This allows the rotating magnetic core 22 to be adapted for high-speed rotation applications, thereby enabling the rotary transformer 100 to be used in such applications.

[0133] In other embodiments, the outer peripheral wall of the rotating core 22 may also protrude to form an end portion, so that an air gap 30 is formed between the end portion of the rotating core 22 and the fixed core 11 along the radial direction Y. In other words, the cross-section of the rotating core 22 parallel to the axial direction X may be roughly L-shaped or U-shaped.

[0134] In some embodiments, see Figure 9 and Figure 10 In the axial direction X, the two opposite ends of the rotating magnetic core 22 can be flush with the fixed magnetic core 11 .

[0135] Specifically, one end of the rotating core 22 along the axial direction X is flush with one end of the fixed core 11 along the axial direction X, and the other end of the rotating core 22 along the axial direction X is flush with the other end of the fixed core 11 along the axial direction X.

[0136] In other embodiments, see Figure 11 , and combined with other drawings. Among them, Figure 11 The sectional view of the rotary transformer 100 provided in some other embodiments of the present application is as follows: In the axial direction X, opposite ends of the rotating magnetic core 22 protrude outside the fixed magnetic core 11 .

[0137] like Figure 11 As shown, the dimension of the rotating core 22 along the axial direction X is greater than the dimension of the fixed core 11 along the axial direction X. One end of the rotating core 22 along the axial direction X protrudes outside one end of the fixed core 11 along the axial direction X, and the other end of the rotating core 22 along the axial direction X protrudes outside the other end of the fixed core 11 along the axial direction X.

[0138] Such an arrangement ensures that when the rotating magnetic core 22 moves in the axial direction X, the rotating magnetic core 22 can still face the fixed magnetic core 11 in the radial direction Y, and the facing area between the rotating magnetic core 22 and the fixed magnetic core 11 is large. This can improve the problem of the main magnetic circuit being affected when the rotating magnetic core 22 moves, thereby further reducing the fluctuation of the inductance, and further reducing the sensitivity of the rotary transformer 100 to the axial direction X movement.

[0139] In other embodiments, see Figure 12 , and combined with other drawings. Among them, Figure 12 1 is a cross-sectional view of a rotary transformer 100 provided in accordance with some other embodiments of the present application. In the axial direction X, opposite ends of the fixed magnetic core 11 protrude out of the rotating magnetic core 22 .

[0140] like Figure 12 As shown, the dimension of the rotating core 22 along the axial direction X is smaller than the dimension of the fixed core 11 along the axial direction X. One end of the fixed core 11 along the axial direction X protrudes outside one end of the rotating core 22 along the axial direction X, and the other end of the fixed core 11 along the axial direction X protrudes outside the other end of the rotating core 22 along the axial direction X.

[0141] By adopting the above technical solution, when the rotating magnetic core 22 moves along the second air gap 30b toward the first air gap 30a, the facing area between the rotating magnetic core 22 and the fixed magnetic core 11 at the first air gap 30a increases, and the facing area between the rotating magnetic core 22 and the fixed magnetic core 11 at the second air gap 30b decreases, so that the overall facing area between the rotating magnetic core 22 and the fixed magnetic core 11 remains basically unchanged. This can improve the problem of the main magnetic circuit being affected when the rotating magnetic core 22 moves, thereby further reducing the fluctuation of the inductance, and further reducing the sensitivity of the rotary transformer 100 to axial X-movement.

[0142] In some embodiments, please refer to Figures 7 to 10 , and in combination with other drawings. The rotating winding 21 is a planar winding.

[0143] Planar windings are coils made by winding conductors in layers on a flat surface. In some examples, these can include printed circuit board (PCB) windings. PCB windings are electromagnetic coil structures implemented on a printed circuit board (PCB). Specifically, PCB windings print the coil conductors on a PCB, creating a compact and integrated coil structure.

[0144] This arrangement results in a roughly plate-like structure for the rotating winding 21. This, on the one hand, facilitates the layout of the rotating winding 21 and the stationary winding 12 within the magnetic core window 40, thereby improving the spatial utilization of the magnetic core window 40 and contributing to a miniaturized and lightweight design for the resolver 100. On the other hand, it facilitates the separation of the rotating winding 21 from the air gap 30, thereby reducing the impact of the spatial harmonic magnetic field at the air gap 30 on the rotating winding 21. This reduces eddy current losses caused by the spatial harmonic magnetic field in the rotating winding 21, thereby improving the rotational stability of the resolver 100 and enhancing the measurement accuracy of the resolver 100.

[0145] Furthermore, the planar design of the rotating winding 21 allows the rotating winding 21 to be prefabricated before the rotating magnetic core 22 is mounted on the rotating winding 21. This eliminates the need for the rotating magnetic core 22 to be formed into a U-shaped structure to wind and position the rotating winding 21. This facilitates the miniaturization and lightweight design of the rotating magnetic core 22, further facilitating the application of the resolver 100 in high-speed rotation applications.

[0146] In some embodiments, the fixed winding 12 may be a planar winding, or a winding in which a wire, copper foil, or the like is wound around the fixed magnetic core 11 .

[0147] In some embodiments, please refer to Figures 9 to 13 , and combined with other drawings. Among them, Figure 13 1 is a cross-sectional view of a 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.

[0148] This arrangement, on the one hand, facilitates the separation of the rotating winding 21 from the air gap 30, thereby reducing the impact of the spatial harmonic magnetic field at the air gap 30 on the rotating winding 21, reducing eddy current losses caused by the spatial harmonic magnetic field on the rotating winding 21, and improving the rotational stability and measurement accuracy of the resolver 100. Furthermore, it allows the rotating winding 21 and the stationary winding 12 to be closer along the axial direction X, which facilitates increasing the electromagnetic coupling coefficient between the rotating winding 21 and the stationary winding 12, thereby reducing the loss of the rotating winding 21, improving the rotational stability and measurement accuracy of the resolver 100.

[0149] In some embodiments, please refer to Figures 9 to 12 , and in combination with other drawings. There are multiple fixed windings 12, and fixed windings 12 are respectively provided on two opposite sides of the rotating winding 21 along the axial direction X.

[0150] It can be understood that, in the axial direction X, the rotating winding 21 and the fixed winding 12 can be distributed in a layout of fixed winding 12, rotating winding 21, fixed winding 12, . . . .

[0151] As an example, Figure 9 As shown, there is one rotating winding 21 and two fixed windings 12 . The two fixed windings 12 are spaced apart along the axial direction X, and in the axial direction X, the rotating winding 21 is located between the two fixed windings 12 .

[0152] Such a configuration can improve the coupling coefficient between the rotating winding 21 and the fixed winding 12 , thereby reducing the loss of the rotating winding 21 , improving the rotational stability of the rotary transformer 100 , and improving the measurement accuracy of the rotary transformer 100 .

[0153] In other embodiments, Figure 13 As shown, the fixed winding 12 may be located on only one side of the rotating winding 21 along the axial direction X.

[0154] In some embodiments, both the rotating winding 21 and the fixed winding 12 are planar windings, which facilitates the layout of the rotating winding 21 and the fixed winding 12 in the core window 40 and facilitates electromagnetic coupling between the rotating winding 21 and the fixed winding 12 .

[0155] In some embodiments, please refer to Figures 7 to 13 , and in combination with other drawings. The outer peripheral wall of the rotating core 22 is extended along the axial direction X straight line.

[0156] Based on this, in a cross section of the rotating magnetic core 22 parallel to the axial direction X, the rotating magnetic core 22 is substantially in an “I”-shaped structure.

[0157] Compared to L-shaped or U-shaped rotating cores 22 in some cases, the rotating core 22 provided in this embodiment of the present application is smaller, achieving both miniaturization and weight reduction. This allows the rotating core 22 to achieve high-speed rotation, enabling the resolver 100 to be used in high-speed rotation applications.

[0158] In some embodiments, please refer to Figure 7 and Figure 8 , and in combination with other drawings, the rotating magnetic core 22 includes a plurality of first magnetic cores 221 .

[0159] The first magnetic core 221 refers to a portion of the rotating magnetic core 22 and has a relatively high magnetic permeability.

[0160] The fixed magnetic core 11 may be spaced apart from the corresponding first magnetic core 221 along the radial direction Y to form an air gap 30 .

[0161] The plurality of first magnetic cores 221 may adopt at least one of the following three solutions:

[0162] The first one, such as Figure 7 and Figure 8 As shown in FIG. 1 and in conjunction with other figures, at least a portion of the first magnetic cores 221 is distributed along the circumferential direction Z on the rotating winding 21 .

[0163] As an example, Figure 8 As shown, a plurality of first magnetic cores 221 are distributed on the rotating winding 21 at intervals along the circumferential direction Z.

[0164] Second, at least part of the first magnetic cores 221 are distributed along the axial direction X on the rotating winding 21 .

[0165] The third type is that at least part of the first magnetic cores 221 are distributed along the radial direction Y on the rotating winding 21 .

[0166] By adopting the above technical solution, multiple first magnetic cores 221 are distributed on the rotating winding 21 to form the rotating magnetic core 22. This helps to reduce the weight of the rotating magnetic core 22, so that the rotary transformer 100 can be used in high-speed rotation applications.

[0167] In some embodiments, please refer to Figures 7 to 10 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.

[0168] The first limiting groove 201 refers to a groove provided on the rotating winding 21 for limiting the rotating magnetic core 22 .

[0169] The first limiting groove 201 limits the rotating magnetic core 22 in the radial direction Y, so that the first limiting groove 201 can resist the centrifugal force during the rotation of the rotating magnetic core 22, thereby improving the stability of the rotating part 20 during the rotation process, so that the rotary transformer 100 can be used in high-speed rotation occasions.

[0170] In some embodiments, as Figures 7 to 10 As shown, the first limiting groove 201 can be set along the axial direction X to pass through the rotating winding 21.

[0171] With this arrangement, the rotating magnetic core 22 can pass through the first limiting slot 201 along the axial direction X, extending outside of opposite sides of the first limiting slot 201 along the axial direction X. That is, in the axial direction X, two opposing portions of the rotating magnetic core 22 are located outside of opposite sides of the first limiting slot 201, and the rotating winding 21 is located between the two opposing portions of the rotating magnetic core 22 along the axial direction X. The portion of the rotating magnetic core 22 that extends outside of one side of the first limiting slot 201 along the axial direction X can be separated from the fixed magnetic core 11 along the radial direction Y to form a first air gap 30a. The portion of the rotating magnetic core 22 that extends outside of the other side of the first limiting slot 201 along the axial direction X can be separated from the fixed magnetic core 11 along the radial direction Y to form a second air gap 30b.

[0172] In other embodiments, opposite sides of the rotating winding 21 along the axial direction X are recessed to form the aforementioned first limiting grooves 201, that is, the first limiting grooves 201 can form grooves. The rotating magnetic core 22 can include multiple first magnetic cores 221, at least some of which are sequentially distributed along the axial direction X. The first magnetic cores 221 are confined within corresponding first limiting grooves 201, such that the rotating winding 21 is provided with first magnetic cores 221 on opposite sides of the axial direction X. The first magnetic cores 221 on one side of the rotating winding 21 along the axial direction X are separated 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 along the axial direction X is separated from the fixed magnetic core 11 to form a second air gap 30b.

[0173] It should be supplemented here that the rotating winding 21 can be provided with a plurality of first limiting slots 201 , among which some of the first limiting slots 201 can be through slots, and some of the first limiting slots 201 can be grooves.

[0174] In some embodiments, please refer to Figure 7 and Figure 8 , and in conjunction with other drawings. The rotating winding 21 is provided with a plurality of the aforementioned first limiting slots 201, at least some of which are spaced apart along the circumferential direction Z. The rotating magnetic core 22 includes a plurality of first magnetic cores 221, each of which is limited in the corresponding first limiting slots 201 along the radial direction Y and the circumferential direction Z.

[0175] By adopting the above technical solution, on the one hand, each first magnetic core 221 is confined within a corresponding first limiting slot 201, and multiple first limiting slots 201 are spaced apart along the circumferential direction Z. This allows the multiple first magnetic cores 221 to be arranged at intervals, which helps reduce the weight of the rotating magnetic core 22 and facilitates its use in high-speed rotation applications, thereby enabling the resolver 100 to be used in high-speed rotation applications. Furthermore, the first magnetic cores 221 are confined within the first limiting slots 201 along both the radial direction Y and the circumferential direction Z, allowing the rotating magnetic core 22 to be securely mounted on the rotating winding 21. This mitigates the risk of the rotating magnetic core 22 being thrown out during high-speed rotation due to high eccentricity, thereby improving the high-speed rotation stability of the resolver 100.

[0176] As an example, Figure 8 As shown, the first limiting slot 201 is a through slot that passes through the rotating winding 21. A plurality of first limiting slots 201 are distributed along the circumferential direction Z at intervals along 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 along the circumferential direction Z at intervals, and each first magnetic core 221 is retained within a corresponding first limiting slot 201.

[0177] like Figure 8As shown, the rotating winding 21 may include 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. A 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, so that the annular portion 212, the middle portion 211, and two adjacent connecting portions 213 surround and form a first limiting groove 201. When the first magnetic core 221 is limited in the first limiting groove 201, the first magnetic core 221 is limited between the annular portion 212 and the middle portion 211 in the radial direction Y, and between the two adjacent connecting portions 213 in the circumferential direction Z, thereby achieving circumferential Z and radial Y positioning of the rotating magnetic core 22 on the rotating winding 21.

[0178] At least a portion of the annular portion 212 of the rotating winding 21 is located within the magnetic core window 40 for electromagnetic coupling with the fixed winding 12 .

[0179] In some embodiments, please refer to Figures 7 to 15 , and combined with other drawings. Among them, Figure 14 This is a three-dimensional structural diagram of the rotating part 20 of the rotary transformer 100 provided in some embodiments of the present application. Figure 15 for Figure 14 The rotary transformer 100 further includes a rotating shaft structure 23 , through which the rotating core 22 is mounted on the rotating winding 21 .

[0180] The rotating shaft structure 23 is a structure for mounting the rotating core 22 on the rotating winding 21 .

[0181] Because the rotating core 22 is mounted on the rotating winding 21 via the rotating shaft structure 23, the rotating core 22 does not require any additional design to mount or position the rotating winding 21. For example, there is no need to form an L-shaped or U-shaped cross section of the rotating core 22 parallel to the axial direction X. This allows the rotating core 22 to be very simple and compact. For example, the outer peripheral wall of the rotating core 22 can be arranged to extend linearly along the axial direction X, forming the rotating core 22 in an I-shaped configuration. This reduces the weight of the rotating core 22 and enables high-speed rotation of the rotating core 22 relative to the fixed core 11, thereby enabling the resolver 100 to be used in high-speed rotation applications.

[0182] It should be noted that when the rotary transformer 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 rotary transformer 100 .

[0183] In some embodiments, please refer to Figures 7 to 15, and in conjunction with other figures. The rotating shaft structure 23 is mounted on the rotating winding 21 and includes a first limiting portion 2312 and a second limiting portion 2322. The first limiting portion 2312 and the second limiting portion 2322 are respectively provided on opposite sides of the rotating winding 21 along the axial direction X. The rotating magnetic core 22 includes a first magnetic core 221.

[0184] like Figures 7 to 15 As shown, the rotating shaft structure 23 includes a first limiting portion 2312 and a second limiting portion 2322. The first limiting portion 2312 and the second limiting portion 2322 are spaced apart along the axial direction X and are respectively located on opposite sides of the rotating winding 21 along the axial direction X. The remaining portions of the rotating shaft structure 23, except for the first limiting portion 2312 and the second limiting portion 2322, are mounted on the rotating winding 21 so that the relative positions of the first limiting portion 2312 and the rotating winding 21, and the relative positions of the second limiting portion 2322 and the rotating winding 21 can be fixed, that is, the rotating shaft structure 23 is entirely fixed on the rotating winding 21.

[0185] Specifically, the relative position of the first limiting portion 2312 and the rotating winding 21 along the axial direction X, and the relative position of the second limiting portion 2322 and the rotating winding 21 along the axial direction X can be fixed, that is, the relative position of the first limiting portion 2312 and the second limiting portion 2322 in the axial direction X can be fixed, so that the entire rotating shaft structure 23 is limited on the rotating winding 21 along the axial direction X.

[0186] The first magnetic core 221 refers to at least a portion of the rotating magnetic core 22 and has a relatively high magnetic permeability, which is the same as the above-mentioned first magnetic core 221. The number of the first magnetic core 221 can be one or more.

[0187] The first limiting portion 2312 and the second limiting portion 2322 can be used to achieve axial X-limiting of the first magnetic core 221 , and specifically, at least one of the following two solutions can be adopted:

[0188] The first one, such as Figures 7 to 15 As shown in the figure, and in combination with other figures, 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.

[0189] Specifically, the rotating winding 21 is provided with a first limiting groove 201 along the axial direction X, and the first magnetic core 221 is passed through the first limiting groove 201, so that the first magnetic core 221 extends out of the first limiting groove 201 on two opposite sides along the axial direction X respectively. The part of the first magnetic core 221 extending out of one side of the first limiting groove 201 is separated 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 groove 201 is separated from the fixed magnetic core 11 to form a second air gap 30b.

[0190] In 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 respectively limited at two opposite ends of the first magnetic core 221 along the axial direction X.

[0191] With this arrangement, the first limiting portion 2312 and the second limiting portion 2322 limit the first magnetic core 221 in the axial direction X, so that the first magnetic core 221 is limited on the rotating shaft structure 23 in the axial direction X. Because the rotating shaft structure 23 is 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.

[0192] In the second method, a first magnetic core 221 is provided on 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.

[0193] It can be understood that in the axial direction X, the first magnetic cores 221 are respectively provided on the opposite sides of the rotating winding 21. The first magnetic core 221 on one side of the rotating winding 21 can be spaced 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 from the fixed magnetic core 11 to form a second air gap 30b.

[0194] 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 cores 221 on opposite sides of the rotating winding 21 are both 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 along the axial direction X, that is, the first magnetic core 221 on one side of the rotating winding 21 is limited along the axial direction X between the rotating winding 21 and the first limiting portion 2312. 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 along the axial direction X, that is, the first magnetic core 221 on the other side of the rotating winding 21 is limited along the axial direction X between the rotating winding 21 and the second limiting portion 2322.

[0195] Such an arrangement enables the rotating shaft structure 23 to mount the rotating magnetic core 22 on the rotating winding 21 , so that the rotating magnetic core 22 is located on the rotating winding 21 at least along the axial direction X.

[0196] Based on this, there is no need to form the rotating core 22's cross-section parallel to the axial direction X into an "L" or "U" shape to wind and position the rotating winding 21 along the axial direction X. This allows the outer peripheral wall of the rotating core 22 to extend linearly along the axial direction X, allowing the rotating core 22 to be constructed in a simple "I" shape, allowing it to be inserted into the first position-limiting slot 201 of the rotating winding 21. This helps reduce the weight of the rotating core 22, enabling it to rotate at high speed relative to the fixed core 11, thereby enabling the resolver 100 to be used in high-speed rotation applications.

[0197] In some embodiments, please refer to Figure 14 and Figure 15 , and in conjunction with other drawings. The rotating shaft structure 23 includes a first rotating shaft 231 and a second rotating shaft 232. The first rotating shaft 231 includes a first shaft body 2311 and the aforementioned first limiting portion 2312, the first limiting portion 2312 being connected to the first shaft body 2311. The second rotating shaft 232 includes a second shaft body 2321 and the aforementioned second limiting portion 2322, the second limiting portion 2322 being connected to the second shaft body 2321.

[0198] The first shaft 2311 and the second shaft 2321 are connected to each other to be mounted on the rotating winding 21 .

[0199] 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 segmented to obtain the first rotating shaft 231 and the second rotating shaft 232 .

[0200] The first shaft 2311 and the first limiting portion 2312 are two parts of the first rotating shaft 231 , and the second shaft 2321 and the second limiting portion 2322 are two parts of the first rotating shaft 231 .

[0201] The first shaft 2311 and the second shaft 2321 are connected to each other and mounted on the rotating winding 21, so that the first stopper 2312 and the second stopper 2322 are both positioned relative to the rotating winding 21. In other words, the rest of the rotating shaft structure 23 except the first stopper 2312 and the second stopper 2322 is mounted on the rotating winding 21.

[0202] By dividing the rotating shaft structure 23 into a first rotating shaft 231 and a second rotating shaft 232, the rotating shaft structure 23 can first restrain the first magnetic core 221 of the rotating magnetic core 22 within the first restraining groove 201, then press the first restraining portion 2312 of the first rotating shaft 231 and the second restraining portion 2322 of the second rotating shaft 232 against the first magnetic core 221. Finally, the first shaft 2311 of the first rotating shaft 231 and the second shaft 2321 of the second rotating shaft 232 are connected to each other, so that the first shaft 2311 and the second shaft 2321 are mounted on the rotating winding 21. In this way, the rotating shaft structure 23 can securely mount the rotating magnetic core 22 on the rotating winding 21, achieving a stable mounting effect for the rotating portion 20. Consequently, the operation of mounting the rotating magnetic core 22 on the rotating winding 21 by the rotating shaft structure 23 is very convenient and easy to implement.

[0203] It should be supplemented here that the rotating magnetic core 22 can be disposed around the outer periphery of the first shaft 2311 and the second shaft 2322 , and the fixed magnetic core 11 can be disposed around the outer periphery of the first shaft 2311 and the second shaft 2321 .

[0204] In some embodiments, please refer to Figure 14 and Figure 15 , and in conjunction with other figures. The middle portion 211 of the rotating winding 21 can be annular. The first shaft 2311 of the first rotating shaft 231 can be inserted into the middle portion 211 along the axial direction X to connect with the second shaft 2321 of the second rotating shaft 232. This allows the middle portion 211 to be limitedly positioned between the first shaft 2311 and the second shaft 2321 along the axial direction X, thereby enabling the installation of the rotating shaft structure 23 on the rotating winding 21.

[0205] In some embodiments, please refer to Figure 14 and Figure 15 , and in combination with other drawings, the rotating shaft structure 23 further includes a third limiting portion 2313 .

[0206] The third limiting portion 2313 refers to a portion of the rotating shaft structure 23 used to limit the first magnetic core 221 in the circumferential Z direction.

[0207] The third limiting portion 2313 can limit the first magnetic core 221 by adopting at least one of the following two solutions:

[0208] First, see Figure 14 and Figure 15 , and in combination with other drawings, a second limiting groove 202 is formed between the third limiting portion 2313 and the first limiting portion 2312 .

[0209] It can be understood that the first rotating shaft 231 further includes a third limiting portion 2313 , which is disposed on the first shaft body 2311 , such that the third limiting portion 2313 and the first limiting portion 2312 surround and form the second limiting groove 202 .

[0210] Among them, on the first rotating shaft 231, the number of third limiting parts 2313 can be multiple, and multiple third limiting parts 2313 can be distributed on the first shaft body 2311 at intervals along the circumferential direction Z, so that two adjacent third limiting parts 2313 can be surrounded by the first limiting part 2312 to form a second limiting groove 202, so that the first rotating shaft 231 can be surrounded to form multiple second limiting grooves 202 distributed in sequence along the circumferential direction Z.

[0211] Second, see Figure 14 and Figure 15 The second limiting groove 202 is formed between the third limiting portion 2313 and the second limiting portion 2322 .

[0212] It can be understood that the second rotation shaft 232 further includes a third limiting portion 2313 , which is disposed on the second shaft body 2321 , such that the third limiting portion 2313 and the second limiting portion 2322 surround and form the second limiting groove 202 .

[0213] Among them, on the second rotating shaft 232, the number of third limiting parts 2313 can be multiple, and multiple third limiting parts 2313 can be distributed on the second shaft body 2321 at intervals along the circumferential direction Z, so that two adjacent third limiting parts 2313 can be surrounded by the second limiting part 2322 to form a second limiting groove 202, so that the second rotating shaft 232 can be surrounded to form multiple second limiting grooves 202 distributed in sequence along the circumferential direction Z.

[0214] Based on the above structure, the first magnetic core 221 is limited in the second limiting groove 202 along the circumferential direction Z.

[0215] Such an arrangement enables the shaft structure 23 to limit the rotating magnetic core 22 in the circumferential direction Z, thereby achieving a stable installation effect of the rotating part 20, which is beneficial for the application of the rotating part 20 in high-speed rotation occasions.

[0216] In some embodiments, please refer to Figure 8 and Figure 16 , and combined with other drawings. Among them, Figure 16 This is an exploded schematic diagram of a rotary transformer 100 provided in some other embodiments of the present application. The fixed magnetic core 11 includes a plurality of second magnetic cores 111 .

[0217] The second magnetic core 111 refers to a portion of the fixed magnetic core 11 and has a higher magnetic conductivity.

[0218] The rotating magnetic core 22 may be spaced apart from the corresponding second magnetic core 111 along the radial direction Y to form an air gap 30 .

[0219] The plurality of second magnetic cores 111 may adopt at least one of the following three solutions:

[0220] The first one, such as Figure 16 As shown, at least part of the second magnetic core 111 is arranged along the circumferential direction Z.

[0221] The second type, such as Figure 8 and Figure 16 As shown, at least part of the second magnetic core 111 is arranged along the axial direction X.

[0222] The third type is that at least part of the second magnetic core 111 is arranged along the radial direction Y.

[0223] By adopting the above technical solution, the fixed magnetic core 11 can be divided into a plurality of second magnetic cores 111 , which helps to reduce the weight of the fixed magnetic core 11 and achieve a lightweight design of the rotary transformer 100 .

[0224] As an example, Figure 8 and Figure 9 As shown, the fixed magnetic core 11 can be divided into two second magnetic cores 111 , and the two second magnetic cores 111 are distributed in sequence along the axial direction X.

[0225] One of the second magnetic cores 111 includes a first outer portion 1113 and the first end 1111. The first outer portion 1113 surrounds the outer circumference of the first end 1111. The other second magnetic core 111 includes a second outer portion 1114 and the second end 1112. The second outer portion 1114 surrounds the outer circumference of the second end 1112. The first outer portion 1113 and the second outer portion 1114 are sequentially arranged along the axial direction X, and the first end 1111 and the second end 1112 are spaced apart along the axial direction X. The first outer portion 1113, the second outer portion 1114, the first end 1111, the second end 1112, and the outer peripheral wall of the rotating magnetic core 22 form a magnetic core window 40. The first end 1111 and the rotating magnetic core 22 are separated along the radial direction Y to form a first air gap 30a. The second end 1112 and the rotating magnetic core 22 are separated along the radial direction Y to form a second air gap 30b. The main magnetic circuit of the rotating core 22 and the fixed core 11 may sequentially pass through the rotating core 22 , the first air gap 30 a , the first end 1111 , the first outer portion 1113 , the second outer portion 1114 , the second end 1112 , the second air gap 30 b , and the rotating core 22 .

[0226] As another example, Figure 16As shown, each of the two second magnetic cores 111 can be divided into multiple parts distributed along the circumferential direction Z. It can also be understood that the fixed magnetic core 11 is divided into two parts of the second magnetic core 111, and the two parts of the second magnetic core 111 are distributed along the axial direction X, and each part of the second magnetic core 111 includes multiple second magnetic cores 111 distributed along the circumferential direction Z. One part of the second magnetic core 111 includes the first end 1111, and the other part of the second magnetic core 111 includes the second end 1112.

[0227] The motor 1000 provided in the embodiment of the present application includes a rotary transformer 100. The rotary transformer 100 in this embodiment is the same as the rotary transformer 100 in the previous embodiment. For details, please refer to the relevant description of the rotary transformer 100 in the previous embodiment, which will not be repeated here.

[0228] As an example, motor 1000 further includes a rotor 200, a stator 300, and a motor shaft 400. Rotor 200 is sleeved around and fixed to motor shaft 400. Stator 300 is sleeved around motor shaft 400 and is rotatable relative to stator 300. Rotating winding 21 of resolver 100 is electrically connected to rotor 200.

[0229] The rotating shaft structure 23 of the rotary transformer 100 is fixedly connected to the motor shaft 400 .

[0230] Based on this, the rotary transformer 100 can be used to measure information such as the angular velocity and angular displacement of the motor shaft 400 .

[0231] The motor 1000 provided in the embodiments of the present application utilizes the resolver 100 described in the above embodiments, thereby reducing the sensitivity of the resolver 100's inductance to axial X-axis motion, thereby improving the resolver's rotational stability and measurement accuracy. Furthermore, the resolver 100 is capable of high-speed rotation.

[0232] See also Figure 1 , and in conjunction with other drawings, the electric drive system provided in the embodiment of the present application includes a motor 1000 and a rotary transformer 100. The rotary transformer 100 in this embodiment is the same as the rotary transformer 100 in the previous embodiment. For details, please refer to the relevant description of the rotary transformer 100 in the previous embodiment, which will not be repeated here.

[0233] The rotating part 20 of the resolver 100 is fixedly connected to the rotor 200 of the motor 1000 .

[0234] As an example, the rotating shaft structure 23 of the rotating part 20 is fixedly connected to the motor shaft 400 of the motor 1000 .

[0235] Furthermore, the control system 3000 may be electrically connected to the fixed winding 12 and the stator 300 , so as to measure the rotational angular velocity and angular displacement of the motor 1000 , thereby controlling the operation of the motor 1000 .

[0236] The electric drive system provided in the embodiment of the present application adopts the rotary transformer 100 involved in the above embodiments, so that the electric drive system can output power stably and efficiently.

[0237] See also Figure 1 , and in conjunction with other drawings, the electric device provided in the embodiment of the present application includes a rotary transformer 100, a motor 1000, or an electric drive system. The rotary transformer 100, motor 1000, and electric drive system in this embodiment are the same as those in the previous embodiment. For details, please refer to the relevant description of the rotary transformer 100, motor 1000, and electric drive system in the previous embodiment, which will not be repeated here.

[0238] The electric device provided in the embodiments of the present application adopts the rotary transformer 100, the motor 1000 or the electric drive system involved in the above embodiments, so that the electric device can output power stably and efficiently.

[0239] As one of the embodiments of this application, Figures 7 to 10 As shown, the rotary transformer 100 includes a fixed portion 10 and a rotating portion 20. The fixed portion 10 includes a fixed magnetic core 11 and a plurality of fixed windings 12 connected to the fixed magnetic core 11. The rotating portion 20 includes a rotating winding 21, a rotating magnetic core 22, and a shaft structure 23. The shaft structure 23 mounts the rotating magnetic core 22 on the rotating winding 21. The fixed magnetic core 11 surrounds the outer periphery of the rotating magnetic core 22 and, together with the rotating magnetic core 22, forms a core window 40. The fixed magnetic core 11 has a first end 1111 and a second end 1112 at opposite ends of the core window 40 along the axial direction X. The first end 1111 is spaced apart from the rotating magnetic core 22 along the radial direction Y to form a first air gap 30a. The second end 1112 is spaced apart from the rotating magnetic core 22 along the radial direction Y to form a second air gap 30b. In the axial direction X, the core window 40 is located between the first air gap 30a and the second air gap 30b and is connected to the first air gap 30a and the second air gap 30b. The rotating core 22 extends linearly along the axial direction X. The rotating winding 21 is a planar winding. A portion of the rotating winding 21 is located within the core window 40, and the fixed winding 12 is also located within the core window 40. In the axial direction X, the fixed windings 12 are located on opposite sides of the rotating winding 21.

[0240] Based on the above structure, the first air gap 30a and the second air gap 30b are set to 0.5mm, 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 rotary transformer 100 is simulated, as shown in FIG. Figure 17 As shown, Figure 17 for Figure 7 The simulation result diagram of the rotary transformer 100 is shown in FIG. Thus, the following data can be obtained:

[0241] L P =50.43uH、M=24.87uH、L S =12.49uH, R P =64.88mΩ, R S =14.03mΩ,

[0242] The maximum flow density is 1.07×10 8 A / m 2 .

[0243] Among them, L P is the self-inductance of the fixed winding 12, M is the mutual inductance of the rotating winding 21 and the fixed winding 12, L S is the self-inductance of the rotating winding 21, R P is the parasitic resistance of the fixed winding 12, R S is the parasitic resistance of the rotating winding 21 .

[0244] As comparative example 1, Figure 18 As shown, Figure 18 The figure is a simulation result of the rotary transformer 100 of comparative example 1. The fixed core 11 constitutes a core window 40, and the fixed winding 12 is arranged in the core window 40. A notch is provided on the inner circumference of the fixed core 11, and the notch is radially distributed and connected to the core window 40. The rotating winding 21 passes through the notch in the radial direction Y, and is partially located in the core window 40. In the axial direction X, the two end faces of the fixed core 11 opposite to the notch are respectively separated from the rotating winding 21 to form an air gap 30. Based on the above structure, the sensitivity of the inductance of the rotary transformer to the axial movement of the rotating part relative to the fixed part can also be reduced. In order to prevent the axial X movement of the rotating winding 21 from interfering with the fixed 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 rotating winding 21 is set to 3 turns. The rotary transformer 100 is simulated, as shown in FIG. Figure 18 As shown. Thus, the following data can be obtained:

[0245] L P =18.53uH、M=8.1uH、L S =4.25uH, R P =253.47mΩ, R S =87.54mΩ. Current

[0246] The highest density is 2.65×10 8 A / m 2 .

[0247] From the above two sets of simulation data, it can be seen that, on the one hand, the air gap 30 of the rotary transformer 100 provided in the embodiment of the present application is smaller, and the inductance of the rotary transformer 100 is larger, which is about 2.7 times the inductance in Comparative Example 1.

[0248] Furthermore, the equivalent resistance of the rotary transformer 100 provided in the embodiment of the present application is relatively small, being approximately 0.25 of the equivalent resistance in Comparative Example 1. Based on this, the rotary transformer 100 provided in the embodiment of the present application has relatively low loss.

[0249] Furthermore, the current density of the rotary transformer 100 provided in the embodiment of the present application is lower than that of the rotary transformer 100 in Comparative Example 1, so that the heating of the rotary transformer 100 provided in the embodiment of the present application is more uniform, which helps to reduce losses.

[0250] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A rotary transformer, characterized in that: include: a fixed part comprising a fixed magnetic core and a fixed winding connected to the fixed magnetic core; A rotating part, comprising a rotating magnetic core and a rotating winding connected to the rotating magnetic core; The fixed magnetic core is sleeved on the outer circumference of the rotating magnetic core and forms a magnetic core window with the rotating magnetic core, and at least a portion of the rotating winding is arranged in the magnetic core window; the rotating magnetic core is capable of rotating relative to the fixed magnetic core and is radially spaced from the fixed magnetic core to form an air gap, and the air gap is connected to the opposite ends of the magnetic core window along the axial direction.

2. The rotary transformer according to claim 1, wherein: The fixed magnetic core is provided with a first end and a second end at opposite ends of the magnetic core window along the axial direction, respectively. The air gap is formed along the radial direction between the first end and the rotating magnetic core, and between the second end and the rotating magnetic core.

3. The rotary transformer according to claim 1 or 2, characterized in that: In the axial direction, opposite ends of the rotating magnetic core protrude outside the fixed magnetic core; Alternatively, in the axial direction, opposite ends of the fixed magnetic core protrude outside the rotating magnetic core.

4. The rotary transformer according to any one of claims 1 to 3, characterized in that: The rotating winding is a planar winding.

5. The rotary transformer according to any one of claims 1 to 4, characterized in that: The rotating winding and the fixed winding are arranged along the axial direction.

6. The rotary transformer according to claim 5, characterized in that There are multiple fixed windings, and the fixed windings are respectively provided on two opposite sides of the rotating winding along the axial direction.

7. The rotary transformer according to any one of claims 1 to 6, characterized in that: The outer peripheral wall of the rotating magnetic core is extended along the axial line.

8. The rotary transformer according to any one of claims 1 to 7, characterized in that: The rotating magnetic core includes multiple 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.

9. The rotary transformer according to any one of claims 1 to 8, characterized in that: The rotating winding is provided with a first limiting groove, and the rotating magnetic core is limited in the first limiting groove along the radial direction.

10. The rotary transformer according to claim 9, characterized in that: The rotating winding is provided with a plurality of the first limiting grooves, at least some of which are spaced apart along the circumferential direction; the rotating magnetic core includes a plurality of first magnetic cores, which are respectively limited in the corresponding first limiting grooves along the radial direction and the circumferential direction.

11. The rotary transformer according to any one of claims 1 to 10, characterized in that: 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.

12. The rotary transformer according to claim 11, characterized in that The rotating shaft structure is mounted on the rotating winding, and the rotating shaft structure includes a first limiting portion and a second limiting portion, wherein the first limiting portion and the second limiting portion are respectively provided on opposite sides of the rotating winding along the axial direction, and the rotating magnetic core includes a first magnetic core; 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 first magnetic core is respectively provided on opposite sides of the rotating winding along the axial direction, and the first limiting portion and the second limiting portion respectively limit the corresponding first magnetic core on the rotating winding along the axial direction.

13. The rotary transformer according to claim 12, characterized in that: The rotating shaft structure includes a first rotating shaft and a second rotating shaft, the first rotating shaft includes a first shaft body and a first limiting portion connected to the first shaft body, and the second rotating shaft includes a second shaft body and a second limiting portion connected to the second shaft body; the first shaft body and the second shaft body are connected to each other to be installed on the rotating winding.

14. The rotary transformer according to claim 12 or 13, characterized in that: The rotating shaft structure further includes a third limiting portion; A second limiting groove is formed between the third limiting portion and the first limiting portion, and / or between the third limiting portion and the second limiting portion, and the first magnetic core is circumferentially limited in the second limiting groove.

15. The rotary transformer according to any one of claims 1 to 14, characterized in that: The fixed magnetic core includes 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.

16. A motor, characterized in that: The rotary transformer comprises the rotary transformer according to any one of claims 1 to 15.

17. An electric drive system, characterized in that: It comprises a motor and a rotary transformer according to any one of claims 1 to 15, wherein the rotor of the motor is fixedly connected to the rotating part.

18. An electric device, characterized in that: The rotary transformer comprises the rotary transformer according to any one of claims 1 to 15; or, the motor comprises the motor according to claim 16; or, the electric drive system comprises the electric drive system according to claim 17.

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