A wireless excitation and position detection integrated device and circuit of an electric excitation motor with a multiplexed rotary magnetic coupling mechanism

Abstract

This invention relates to an integrated device and circuit for wireless excitation and position detection of an electrically excited motor that reuses a rotating magnetic coupling mechanism. The invention addresses the problem of increased overall axial length and reduced power density of the motor due to factors such as overlapping installation positions and numerous motor end attachments. The integrated device comprises a wireless power transmission component and a rotor position information detection component. The motor, rotor position information detection component, and wireless power transmission component are arranged sequentially from left to right, and the rotor position information detection component and wireless power transmission component are integrated into a single structure. The circuit consists of a primary-side circuit module and a secondary-side circuit module. The secondary-side circuit module supplies power to the rotor position information detection component from the rotating side. This invention belongs to the field of wireless power transmission technology.

Description

Technical Field

[0001] This invention relates to an integrated device and circuit for wireless excitation and position detection of an electrically excited motor, belonging to the field of wireless power transmission technology. Background Technology

[0002] Electrically Excited Synchronous Machines (EESMs) do not rely on permanent magnets and offer advantages such as controllable excitation, strong speed-up capability, and high efficiency in high-speed regions. However, the carbon brush and slip ring assembly included in EESMs is prone to severe mechanical wear during high-speed operation, which reduces system reliability and increases maintenance costs. Wireless excitation technology based on Wireless Power Transfer (WPT) can replace the carbon brush and slip ring assembly, fundamentally solving the above problems.

[0003] Numerous research institutions both domestically and internationally have conducted extensive studies on EESM wireless excitation technology. The University of Sheffield in the UK proposed a radial coupling mechanism design method, optimizing various aspects including electricity, magnetism, and heat, but it did not consider the problem of high-speed centrifugal force. To address this issue, Oak Ridge National Laboratory in the US proposed a rotating magnetic coupling mechanism without a magnetic core on the rotating side, reducing the rotational inertia of the rotating side; however, this magnetic coupling mechanism requires external heat dissipation. Furthermore, in the market, EESM wireless excitation technology is gradually maturing, with companies such as BMW and Huawei planning to apply it to their next-generation products. However, in motor control, accurate rotor position detection is crucial, and currently, position detection devices are mostly used. In the aforementioned research and product applications, the wireless excitation device and the position detection device are independent, both requiring installation at the motor end. Due to overlapping installation positions and numerous accessories at the motor end, the overall axial length of the motor increases, and the power density decreases. Therefore, it is necessary to propose an integrated device for wireless excitation and rotor position detection of an electrically excited motor to effectively reduce the overall axial length of the device and increase its power density. Summary of the Invention

[0004] To address the problem of increased overall axial length and reduced power density of motors due to factors such as overlapping installation positions and numerous motor end accessories, this invention proposes an integrated device and circuit for wireless excitation and position detection of an electrically excited motor that reuses a rotary magnetic coupling mechanism.

[0005] The technical solution adopted by the present invention to solve the above problems is as follows: The integrated device for wireless excitation and position detection of an electrically excited motor with a reused rotating magnetic coupling mechanism includes a wireless energy transmission component and a rotor position information detection component. The motor, rotor position information detection component, and wireless energy transmission component are arranged sequentially from left to right, and the rotor position information detection component and wireless energy transmission component are an integrated structure. The wireless energy transmission component includes a primary side and a secondary side. The primary side includes a primary magnetic core frame, a primary magnetic core, and a primary winding, which are fixedly installed on the motor. The secondary side includes a secondary magnetic core frame, a secondary magnetic core, a secondary winding, and a secondary rotating circuit. The secondary magnetic core frame is installed on the motor shaft and rotates with the motor shaft. The rotor position information detection component includes a resolver rotor and a resolver stator.

[0006] Furthermore, an air gap is left between the primary side and the secondary side.

[0007] Furthermore, the primary side magnetic core frame is installed on the motor end cover of the motor. The primary side magnetic core frame has two cavities. One cavity is used to install the rotor position information detection component, and the other cavity is used to install the primary side magnetic core and the primary side winding.

[0008] Furthermore, the secondary side magnetic core frame is fixed on the motor shaft. The secondary side magnetic core frame has two cavities. One cavity houses the secondary side magnetic core and secondary side winding, and the other cavity houses the secondary side rotating circuit. The secondary side winding is connected to the secondary side rotating circuit through a wire hole in the secondary side magnetic core frame. One output terminal of the secondary side rotating circuit is connected to the excitation winding of the EESM for motor excitation, and the other output terminal of the secondary side rotating circuit is connected to the resolver rotor of the rotor position information detection component for rotor position information detection.

[0009] Furthermore, the resolver stator of the rotor position information detection component is fixedly embedded in a cavity of the primary magnetic core skeleton, and the terminals of the resolver stator are connected to the external circuit through the through holes on the primary magnetic core skeleton. The resolver rotor of the rotor position information detection component and the resolver stator are radially concentrically distributed, and the resolver rotor is fixed on the motor shaft.

[0010] Furthermore, the resolver rotor is a single-phase excitation winding, while the resolver stator is a two-phase sine and cosine winding. When AC current is applied to the resolver rotor excitation winding, a sine and cosine outer envelope voltage is induced on the resolver stator, and the rotor position information is detected by decoding.

[0011] The present invention discloses an integrated circuit for wireless excitation and position detection of an electrically excited motor using a reusable rotating magnetic coupling mechanism, comprising a primary-side circuit module and a secondary-side circuit module. The primary-side circuit module is fixedly installed and includes a DC power supply, a high-frequency inverter, a primary-side compensation network, and a transmitting coil. The DC power supply is connected to the high-frequency inverter, the primary-side compensation network is integrated on the high-frequency inverter board, the output of the high-frequency inverter is connected to the primary-side compensation network, and the output of the primary-side compensation network is connected to the transmitting coil. The secondary-side circuit module is mounted on the motor shaft and rotates with the motor. It includes a receiving coil, a secondary-side compensation network, a secondary-side rectifier circuit, an excitation winding, and a resolver rotor.

[0012] Furthermore, the receiving coil of the secondary circuit module is connected to the secondary compensation network, and the output of the secondary compensation network is connected to the secondary rectifier circuit for rectification. The rectified electrical energy is directly fed into the excitation winding of the EESM for excitation without the need for a filter capacitor. The output of the secondary compensation network is also connected to the resolver rotor to provide excitation voltage to the resolver rotor from the rotating side for rotor position information detection.

[0013] Furthermore, the secondary rectifier circuit and the excitation winding are connected in series and belong to the same branch, while the resolver rotor belongs to another branch; both branches are powered by the output of the secondary compensation network and are in parallel.

[0014] The beneficial effects of this invention are:

[0015] 1. This invention combines a wireless excitation device with a wound rotary transformer. The rotary rotor is directly powered from the rotating side by a wireless power transmission component, reducing the use of a toroidal transformer, simplifying the additional components at the motor end, reducing the overall axial length of the device, and increasing its power density. Simultaneously, it reduces the cost of the device.

[0016] 2. Unlike the traditional split structure, this invention integrates the rotating magnetic coupling mechanism and the secondary rotating circuit into a single package; making the entire device structure more compact and highly integrated, and further improving the power density of the device.

[0017] 3. Unlike traditional rotary transformer decoding systems, the rotary rotor of the device proposed in this invention is directly powered by the secondary rotating circuit, eliminating the need for an additional excitation buffer circuit, thus simplifying the system circuit and reducing circuit costs.

[0018] 4. The secondary-side circuit module of this invention eliminates the need for filter capacitors, reducing the number of components on the rotating side, further decreasing the rotational inertia on the rotating side, and improving the mechanical reliability of the device. Furthermore, the reduction in components also brings cost advantages. Attached Figure Description

[0019] Figure 1This is a 3D structural schematic diagram of the integrated wireless excitation and position detection device proposed in this invention; Figure 2 This is the system circuit diagram of the integrated wireless excitation and position detection device in Example 1; Figure 3 This is the system circuit diagram of the integrated wireless excitation and position detection device in Example 2; Figure 4 This is a schematic diagram comparing the decoding system of the device proposed in this invention with a traditional rotary transformer decoding system; Figure 5 This is a cross-sectional structure and installation diagram of the wireless excitation and position detection device in Example 1; Figure 6 This is a cross-sectional structure and installation diagram of the wireless excitation and position detection device in Example 2; Figure 7 This is a cross-sectional structure and installation diagram of an existing wireless excitation device and a wound rotary transformer; Figure 8 This is a 3D structural schematic diagram of an existing wireless excitation device and a wound rotary transformer; Figure 9 This is an exploded view of the wireless excitation and position detection device in Example 1 (U-shaped magnetic core splicing installation). Figure 10 This is an exploded view of the wireless excitation and position detection device in Example 2 (U-shaped magnetic core splicing installation). Figure 11 This refers to the winding distribution of the wireless power transmission component in Embodiments 1 and 2; Figure 12 These are schematic diagrams of the secondary side rotation circuit in Embodiments 1 and 2; Figures 5 to 10 In the middle, 00-air gap, 11-primary winding terminal, 12-primary core skeleton, 13-primary core, 14-primary winding, 20-wireless excitation device, 21-secondary core skeleton, 22-secondary core, 23-secondary winding, 24-secondary rotating circuit, 25-one circuit, 26-the other circuit, 30-standardized wound rotary transformer, 31-terminal, 32-resolver stator, 33-resolver rotor, 34-toroidal transformer, 35-toroidal transformer, 40-motor, 41-motor shaft, 42-motor end cover. Detailed Implementation

[0020] Specific implementation method one: as follows Figure 1As shown, this embodiment of an integrated device for wireless excitation and position detection of an electrically excited motor that reuses a rotary magnetic coupling mechanism includes a motor 40. A rotor position information detection component and a wireless energy transmission component are sequentially provided on one side of the motor shaft 41 of the motor 40, and the rotor position information detection component and the wireless energy transmission component are an integrated structure.

[0021] A system circuit of an integrated device for wireless excitation and position detection of an electrically excited motor that reuses a rotary magnetic coupling mechanism includes two parts: a primary side circuit module and a secondary side circuit module. The primary side circuit module is fixedly installed, while the secondary side circuit module is installed on the motor shaft and rotates with the motor.

[0022] The primary circuit module consists of four parts: DC power supply, high-frequency inverter, primary-side compensation network, and transmitting coil. The DC power supply of the primary side circuit module is connected to the high-frequency inverter, and the primary side compensation network is integrated on the inverter board; the output of the inverter is connected to the primary side compensation network, and the output of the primary side compensation network is connected to the transmitting coil. The secondary circuit module consists of five parts: receiving coil, secondary compensation network, secondary rectifier circuit, excitation winding, and resolver rotor (winding). The receiving coil of the secondary circuit module is connected to the secondary compensation network; The output of the secondary compensation network is connected to the secondary rectifier circuit for rectification, and the rectified electrical energy is fed into the excitation winding of the EESM for excitation. On the other hand, it is directly connected to the resolver rotor to provide excitation voltage to the resolver rotor from the rotating side for rotor position information detection, without the need for an additional excitation buffer circuit. The secondary rectifier circuit and the excitation winding are connected in series and belong to the same branch, while the resolver rotor belongs to another branch; both branches are powered by the output of the secondary compensation network and are in parallel. The electrical energy output from the secondary rectifier circuit is directly fed into the excitation winding of the electrically excited motor for excitation, without the need for an additional filter capacitor.

[0023] Specific implementation method two: such as Figure 1 As shown, based on the first specific implementation method, the wireless power transmission component includes a primary side and a secondary side, with an air gap 00 between the primary side and the secondary side.

[0024] One of the primary sides is fixedly installed on the motor end cover 42 of the motor 40, and the secondary side is installed on the motor shaft 41 and rotates with the motor 40.

[0025] The primary side includes three parts: primary magnetic core frame 12, primary magnetic core 13 and primary winding 14; the primary magnetic core frame 12 is fixed on the motor end cover 42 and includes two cavities, left and right. The left cavity is used to install the rotor position information detection component, and the right cavity is used to install the wireless energy transmission component. The primary magnetic core 13 and primary winding 14 of the primary side are also included.

[0026] The secondary side comprises four parts: a secondary magnetic core frame 21, a secondary magnetic core 22, a secondary winding 23, and a secondary rotating circuit 24. The secondary magnetic core frame 21 is fixed to the rotating shaft 41 by means of slotted keys, stepped shafts, and axial clamping rings, and includes two cavities, left and right. The secondary magnetic core 22 and secondary winding 23 of the wireless power transmission component are installed in the left cavity, and the secondary rotating circuit 24 is assembled in the right cavity.

[0027] The primary winding 14 and the secondary winding 23 can be wound with Litz wire; in applications where there are high requirements for axial space or speed of the device, PCB board windings can also be used.

[0028] The secondary winding 23 is connected to the secondary rotating circuit 24 through the wire hole in the secondary magnetic core skeleton 21. The secondary rotating circuit 24 has two output terminals 25 and 26. One terminal 25 is connected to the excitation winding of the EESM for motor excitation; the other terminal 26 is connected to the resolver rotor 33 of the position information detection component for rotor position information detection.

[0029] The resolver rotor 33 is directly powered by the secondary rotating circuit 24, eliminating the need for additional toroidal transformers 34 and 35.

[0030] In some embodiments, the rotor position information detection component may employ a structure of resolver stator 32 and resolver rotor 33 in a standardized wound-rotor transformer 30. The resolver stator 32 is fixedly installed in the left cavity of the primary core frame 12, and its terminals are connected to the external circuit through through holes on the primary core frame 12. The resolver rotor 33 is also located in the left cavity of the primary core frame 12, and is radially concentric with the resolver stator 32, and is mounted on the motor shaft 41 and rotates with the motor 40.

[0031] The primary magnetic core 13 and the secondary magnetic core 22 can be axial or radial structures; they can be a single core or segmented cores. The primary winding 14 and the secondary winding 23 can be coaxial or adjacent windings. The structures of the primary / secondary magnetic cores 13 and 22 and the primary / secondary windings 14 and 23 can be selected to suit the specific installation space and application.

[0032] Specific Implementation Method Three: Based on Specific Implementation Method Two, the primary magnetic core 13 and the secondary magnetic core 22 can be axial or radial structures; they can be a single core or segmented cores. The primary winding 14 and the secondary winding 23 can be coaxial windings or adjacent windings. The structures of the primary / secondary magnetic cores 13 and 22 and the primary / secondary windings 14 and 23 can be selected for adaptability according to the specific installation space and application.

[0033] Specific implementation method four: Based on specific implementation method two, the primary winding 14 and the secondary winding 23 can be wound with Litz wire; in cases where the axial space or speed requirements of the device are high, PCB board windings can also be used.

[0034] Specific implementation method five: Based on specific implementation method two, the resolver rotor 33 is directly powered by the secondary rotating circuit 24, without the need for additional toroidal transformers 34 and 35.

[0035] Example Example 1 like Figure 2 As shown, the system circuit of the integrated device for wireless excitation and position detection of an electrically excited motor using a multiplexed rotary magnetic coupling mechanism adopts an LCC-P type compensation topology, which can realize constant current output on the secondary side; the rectifier circuit adopts uncontrolled rectification.

[0036] The primary circuit module of the system circuit includes four parts: a DC power supply, a high-frequency inverter, a primary-side LCC compensation network, and a transmitting coil. The DC power supply is directly connected to the high-frequency inverter, and the primary-side LCC compensation network is integrated on the inverter board. The primary-side LCC compensation network includes: a compensation inductor L1, a first compensation capacitor C1, and a second compensation capacitor C2. The transmitting coil L... P The first compensation capacitor C1 is connected in parallel with the second compensation capacitor C2. The high-frequency inverter output has two connection terminals A and B. One end of the compensation inductor L1 is connected to connection terminal A, and the other end is connected to one end of the first compensation capacitor C1; the other end of the first compensation capacitor C1 is connected to connection terminal B of the inverter.

[0037] like Figure 2 As shown, the secondary circuit module of the system circuit includes: a receiving coil L S The circuit consists of five parts: a secondary P-type compensation network, a secondary rectifier circuit, an excitation winding, and a resolver rotor. The secondary P-type compensation network contains only one compensation capacitor C3 and is integrated with the secondary rectifier circuit on a single circuit board.

[0038] like Figure 2 As shown, the receiving coil L in the secondary circuit module of the system circuit SThe two ends are connected in parallel with the compensation capacitor C3. The output of the compensation capacitor C3 is connected to the secondary rectifier circuit for rectification. The rectified power is directly fed into the excitation winding of the EESM for excitation without the need for an additional filter capacitor. On the other hand, it is directly connected to the resolver rotor to provide excitation voltage to the resolver rotor from the rotating side for rotor position information detection. Figure 4 Compared to the decoding circuit of a traditional rotary transformer, the rotary rotor of the electric excitation motor wireless excitation and position detection integrated device with multiplexing rotary magnetic coupling mechanism described in this invention is directly powered by the secondary rotating circuit, eliminating the need for an additional excitation buffer circuit, thus simplifying the system circuit and reducing circuit costs.

[0039] like Figure 2 As shown, the secondary rectifier circuit and the excitation winding of the system circuit are connected in series and belong to the same branch, while the resolver rotor belongs to another branch; both branches are powered by the output of the secondary compensation circuit and are in parallel.

[0040] like Figure 1 and Figure 5 As shown, the integrated wireless excitation and position detection device for an electrically excited motor with a multiplexed rotary magnetic coupling mechanism is installed outside the motor end cover 42. This integrated device includes a wireless energy transmission component and a rotor position information detection component. The wireless energy transmission component is divided into a primary side and a secondary side. The primary side includes three parts: a primary magnetic core frame 12, a primary magnetic core 13, and a primary winding 14. The secondary side includes four parts: a secondary magnetic core frame 21, a secondary magnetic core 22, a secondary winding 23, and a secondary rotating circuit 24. The rotary magnetic coupling mechanism adopts an axial structure.

[0041] like Figure 1 and Figure 5 As shown, the rotor position information detection component comprises two parts: a resolver stator 32 (stationary side) and a resolver rotor 33 (rotating side). The resolver rotor 33 is a single-phase excitation winding, and the resolver stator 32 is a two-phase sine and cosine winding. When AC current is applied to the excitation winding of the resolver rotor 33, a sine and cosine outer envelope voltage is induced on the resolver stator 32, which is then decoded to detect the rotor position information.

[0042] like Figure 1 and Figure 5As shown, the primary magnetic core frame 12 comprises two cavities, left and right, and is constructed from a nylon material distributed circumferentially around the periphery of the motor shaft 41. The left side of the primary magnetic core frame 12 is fixed to the outside of the motor end cover 42. The primary magnetic core frame 12 can be flexibly adjusted according to the structure of the motor to construct the two cavities; the left cavity can accommodate the rotor position information detection component, and the right cavity can accommodate the primary magnetic core 13 and primary winding 14 on the primary side of the wireless power transmission component, providing flexibility in implementation.

[0043] like Figure 1 and Figure 5 As shown, the longitudinal section of the primary magnetic core 13 is a U-shape with the opening facing right. It is composed of a manganese-zinc ferrite core distributed circumferentially around the periphery of the motor shaft 41 and embedded in the right-side cavity of the primary magnetic core skeleton 12. The primary magnetic core 13 here can also be made of... Figure 9 The multiple U-shaped magnetic cores shown are assembled together.

[0044] like Figure 1 and Figure 5 As shown, the secondary side and the primary side of the wireless power transmission component are axially distributed, with an air gap 00 between them; and the secondary side is fixed on the motor shaft 41 and rotates together with the motor 40.

[0045] like Figure 1 and Figure 5 As shown, the longitudinal section of the secondary magnetic core frame 21 is a vertical "I" shape, containing two cavities on the left and right. It is composed of nylon material distributed circumferentially around the periphery of the motor shaft 41, and the inner side of the frame is connected to the motor shaft 41 by slotted keys, stepped shafts, and axial clamping rings. The longitudinal section of the secondary magnetic core 22 is a "U" shape opening to the left. It is composed of a piece of manganese-zinc ferrite distributed circumferentially around the periphery of the motor shaft 41 and embedded in the left cavity of the secondary magnetic core frame 21. The secondary magnetic core 22 can also be made of... Figure 9 The multiple U-shaped magnetic cores shown are assembled together.

[0046] like Figure 5 As shown, both the primary winding 14 and the secondary winding 23 of the wireless power transmission component are Litz coils. The primary winding 14 is located in the cavity of the primary magnetic core 13, and the secondary winding 23 is located in the cavity of the secondary magnetic core 22. Both the primary winding 14 and the secondary winding 23 are toroidal coils, arranged adjacent to each other with an air gap 00 between them. The primary winding terminal 11 is connected to the external circuit through the through holes on the primary magnetic core 13 and the primary magnetic core frame 12, and the secondary winding terminal 230 is connected to the secondary rotating circuit 24 through the through holes on the secondary magnetic core 22 and the secondary magnetic core frame 21.

[0047] like Figure 11As shown, the primary winding 14 and the secondary winding 23 can be arranged adjacently or coaxially. Coaxial arrangement method one: the outer winding is the primary winding 14, and the inner winding is the secondary winding 23. Coaxial arrangement method two: the outer winding is the secondary winding 23, and the inner winding is the primary winding 14.

[0048] like Figure 11 As shown, in situations where axial space is extremely limited or high speed requirements are needed, the primary winding 14 and the secondary winding 23 can be PCB windings.

[0049] like Figure 12 As shown, the secondary rotating circuit 24 of the device is a circular PCB circuit board. Figure 7 and Figure 8 The secondary rotating circuit 241 and the rotating magnetic coupling mechanism of the existing wireless excitation device 20 are axially distributed on the motor shaft 41, and the two are encapsulated separately, adopting a split installation structure. Figure 1 and Figure 5 The device proposed in this invention embeds the secondary-side rotating circuit 24 in the right-side cavity of the secondary-side magnetic core skeleton 21, and the secondary-side rotating circuit 24 is encapsulated together with the rotating magnetic coupling mechanism. Furthermore, unlike the secondary-side rotating circuit 241 in the existing wireless excitation device 20, the secondary-side rotating circuit 24 in this device has two output terminals: one, 25, is connected to the excitation winding of the EESM for excitation of the excitation winding; the other, 26, is connected to the resolver rotor 33 of the rotor position information detection component, providing excitation voltage to the resolver rotor 33 from the rotating side for rotor position information detection.

[0050] like Figure 1 and Figure 5 As shown, the resolver rotor 33 in the rotor position information detection component is directly powered by the secondary rotation circuit 24, without the need for additional toroidal transformers 34 and 35.

[0051] like Figure 1 and 5 As shown, the rotor position information detection component can adopt the structure of a resolver stator 32 and resolver rotor 33 in a standardized wound-rotor transformer 30. The resolver stator 32 is embedded in the cavity on the left side of the primary core frame 12 and is fixedly installed. Its terminals 31 are connected to the external circuit through through holes on the primary core frame 12. The resolver rotor 33 is also located in the cavity on the left side of the primary core frame 12, and is radially concentric with the resolver stator 32. It is mounted on the motor shaft 41 and rotates together with the resolver rotor 33.

[0052] During normal operation, the DC power supply outputs high-frequency AC power after passing through the high-frequency inverter. This high-frequency AC power is then compensated by the primary-side LCC compensation network and injected into the primary winding 14 through terminal 11. Subsequently, the AC power is transmitted contactlessly to the secondary winding 23 using the principle of electromagnetic induction. The secondary winding 23 transmits the received electrical energy to the annular PCB board 24 through terminal 230. The PCB board processes the energy to generate two output channels 25 and 26. Output channel 25 supplies current to the excitation winding of the EESM for excitation. Output channel 26 supplies electrical energy to the resolver rotor 33 in the rotor position information detection component for rotor position information detection. Throughout the entire operation, the relative positions of the primary and secondary sides of the wireless energy transmission component, and the resolver stator 32 and resolver rotor 33 of the rotor position information detection component, do not shift. Therefore, the device can stably and reliably excite the excitation winding of the EESM and accurately detect rotor position information.

[0053] Example 2 like Figure 3 As shown, the system circuit of the integrated device for wireless excitation and position detection of an electrically excited motor using a multiplexed rotary magnetic coupling mechanism adopts an LC-P type compensation topology, which can realize constant current output on the secondary side; the rectifier circuit adopts uncontrolled rectification.

[0054] like Figure 3 As shown, the primary circuit module of the system circuit includes: a DC power supply, a high-frequency inverter, a primary-side LC-type compensation network, and a transmitting coil L. P The system consists of four parts. The DC power supply is directly connected to the high-frequency inverter, and the primary-side LC-type compensation network is integrated on the inverter board. The primary-side LC-type compensation network includes: compensation inductor L3 and primary-side compensation capacitor C4. The high-frequency inverter output has two connection terminals, A and B. One end of compensation inductor L3 is connected to connection terminal A, and the other end is connected to one end of primary-side compensation capacitor C4; the other end of primary-side compensation capacitor C1 is connected to connection terminal B of the inverter. The transmitting coil L... P Both ends are connected in parallel with the primary-side compensation capacitor C4.

[0055] like Figure 3 As shown, the secondary circuit module of the system circuit includes: a receiving coil L S The circuit consists of five parts: a secondary P-type compensation network, a secondary rectifier circuit, an excitation winding, and a resolver rotor. The secondary P-type compensation network contains only one compensation capacitor C3 and is integrated with the secondary rectifier circuit on a single circuit board.

[0056] like Figure 3 As shown, the receiving coil L in the secondary circuit module of the system circuit SThe two ends are connected in parallel with the compensation capacitor C3. The output of the compensation capacitor C3 is connected to the secondary rectifier circuit for rectification. The rectified power is directly fed into the excitation winding of the EESM for excitation without the need for an additional filter capacitor. On the other hand, it is directly connected to the resolver rotor to provide excitation voltage to the resolver rotor from the rotating side for rotor position information detection. Figure 4 Compared to the decoding system of traditional rotary transformers, the rotary rotor of the electric excitation motor wireless excitation and position detection integrated device with multiplexing rotary magnetic coupling mechanism described in this invention is directly powered by the secondary rotating circuit, eliminating the need for an additional excitation buffer circuit, thus simplifying the system circuit and reducing circuit costs.

[0057] like Figure 3 As shown, the secondary rectifier circuit and the excitation winding of the system circuit are connected in series and belong to the same branch, while the resolver rotor belongs to another branch; both branches are powered by the output of the secondary compensation circuit and are in parallel.

[0058] like Figure 6 As shown, the integrated wireless excitation and position detection device for an electrically excited motor with a multiplexed rotary magnetic coupling mechanism is installed on the outside of the motor end cover 42. Structurally, the device includes a wireless energy transmission component and a rotor position information detection component. The wireless energy transmission component is divided into a primary side and a secondary side. The primary side includes three parts: a primary magnetic core frame 12, a primary magnetic core 13, and a primary winding 14. The secondary side includes four parts: a secondary magnetic core frame 21, a secondary magnetic core 22, a secondary winding 23, and a secondary rotating circuit 24. The rotary magnetic coupling mechanism adopts a radial structure.

[0059] like Figure 6 As shown, the rotor position information detection component comprises two parts: a resolver stator 32 (stationary side) and a resolver rotor 33 (rotating side). The resolver rotor 33 is a single-phase excitation winding, and the resolver stator 32 is a two-phase sine and cosine winding. When AC current is applied to the excitation winding of the resolver rotor 33, a sine and cosine outer envelope voltage is induced on the resolver stator 32, which is then decoded to detect the rotor position information.

[0060] like Figure 6 As shown, the primary magnetic core frame 12 comprises two cavities, left and right, and is constructed from a nylon material distributed circumferentially around the periphery of the motor shaft 41. The left side of the primary magnetic core frame 12 is fixed to the outside of the motor end cover 42. The primary magnetic core frame 12 can be flexibly adjusted according to the structure of the motor to construct the two cavities; the left cavity can accommodate the rotor position information detection component, and the right cavity can accommodate the primary magnetic core 13 and primary winding 14 on the primary side of the wireless power transmission component, providing flexibility in implementation.

[0061] like Figure 6As shown, the longitudinal section of the primary magnetic core 13 is a U-shaped opening facing downwards. It is composed of two manganese-zinc ferrite pieces distributed circumferentially around the periphery of the motor shaft 41 and embedded in the right-side cavity of the primary magnetic core frame 12. The primary magnetic core 13 here can also be... Figure 10 The multiple U-shaped magnetic cores shown are assembled together.

[0062] like Figure 6 As shown, the secondary side and the primary side of the wireless power transmission component are concentrically distributed, with an air gap 00 between them; and the secondary side is fixed on the motor shaft 41 and rotates together with the motor 40.

[0063] like Figure 6 As shown, the secondary magnetic core skeleton 21 comprises two cavities, left and right, and is composed of nylon material distributed circumferentially around the periphery of the motor shaft 41. The inner side of the skeleton is connected to the motor shaft 41 via slotted keys, stepped shafts, and axial clamping rings. The secondary magnetic core 22 has a U-shaped longitudinal section with an upward opening, and is composed of two manganese-zinc ferrite pieces distributed circumferentially around the periphery of the motor shaft 41, embedded in the left cavity of the secondary magnetic core skeleton 21. The secondary magnetic core 22 can also be made of... Figure 10 The multiple U-shaped magnetic cores shown are assembled together.

[0064] like Figure 6 As shown, both the primary winding 14 and the secondary winding 23 of the wireless power transmission component are Litz coils. The primary winding 14 is located in the cavity of the primary magnetic core 13, and the secondary winding 23 is located in the cavity of the secondary magnetic core 22. Both the primary winding 14 and the secondary winding 23 are toroidal coils, arranged coaxially with an air gap 00 between them. The primary winding terminal 11 is connected to the external circuit through a through hole on the primary magnetic core 13 and the primary magnetic core frame 12, and the secondary winding terminal 230 is connected to the secondary rotating circuit 24 through a through hole on the secondary magnetic core 22 and the secondary magnetic core frame 21.

[0065] like Figure 11 As shown, the primary winding 14 and the secondary winding 23 can be arranged coaxially with Litz wires or adjacently with Litz wires.

[0066] like Figure 12 As shown, the secondary rotating circuit 24 of the device is a circular PCB circuit board. Figure 7 and Figure 8 The secondary rotating circuit 241 and the rotating magnetic coupling mechanism of the existing wireless excitation device 20 are axially distributed on the motor shaft 41, and the two are encapsulated separately, adopting a split installation structure. Figure 6The device proposed in this invention embeds the secondary-side rotating circuit 24 in the right-side cavity of the secondary-side magnetic core skeleton 21, and the secondary-side rotating circuit 24 is encapsulated together with the rotating magnetic coupling mechanism. Furthermore, unlike the secondary-side rotating circuit 241 in the existing wireless excitation device 20, the secondary-side rotating circuit 24 in this device has two output terminals: one, 25, is connected to the excitation winding of the EESM for excitation of the excitation winding; the other, 26, is connected to the resolver rotor 33 of the rotor position information detection component, providing excitation voltage to the resolver rotor 33 from the rotating side for rotor position information detection.

[0067] like Figure 6 and Figure 7 As shown, the resolver rotor 33 in the rotor position information detection component is directly powered by the secondary rotation circuit 24, without the need for additional toroidal transformers 34 and 35.

[0068] like Figure 6 As shown, the rotor position information detection component can adopt the structure of a resolver stator 32 and resolver rotor 33 in a standardized wound-rotor transformer 30. The resolver stator 32 is embedded in the cavity on the left side of the primary core frame 12 and is fixedly installed. Its terminals 31 are connected to the external circuit through through holes on the primary core frame 12. The resolver rotor 33 is also located in the cavity on the left side of the primary core frame 12, and is radially concentric with the resolver stator 32. It is mounted on the motor shaft 41 and rotates together with the resolver rotor 33.

[0069] During normal operation, the DC power supply outputs high-frequency AC power after passing through the high-frequency inverter. This high-frequency AC power, after compensation by the primary-side LC compensation network, is injected into the primary winding 14 from terminal 11. Then, using the principle of electromagnetic induction, the AC power is transmitted contactlessly to the secondary winding 23. The secondary winding 23 transmits the received electrical energy to the annular PCB board 24 through terminal 230. The PCB board processes the energy to generate two output channels 25 and 26. Output channel 25 supplies current to the excitation winding of the EESM for excitation. Output channel 26 supplies electrical energy to the resolver rotor 33 in the rotor position information detection component for rotor position information detection. Throughout the entire operation, the relative positions of the primary and secondary sides of the wireless power transmission component, and the resolver stator 32 and resolver rotor 33 of the rotor position information detection component, do not shift. Therefore, the device can stably and reliably excite the excitation winding of the EESM and accurately detect rotor position information.

[0070] Working principle This invention proposes an integrated device and circuit for wireless excitation and position detection of an electrically excited motor that reuses a rotating magnetic coupling mechanism. Unlike traditional wireless excitation devices and wound rotary transformers, this device eliminates the toroidal transformer structure found in wound rotary transformers by reusing the rotating magnetic coupling mechanism in the wireless excitation device. This reduces the overall axial length and cost of the device while increasing its power density. Furthermore, the rotating magnetic coupling mechanism integrates the secondary magnetic core and the secondary rotating circuit, further reducing the device size and increasing power density. In terms of system circuitry, unlike the decoding system of traditional rotary transformers, the proposed device can be directly powered by the secondary rotating circuit, eliminating the need for an additional excitation buffer circuit and simplifying the system circuitry. Compared to traditional wirelessly excited motor solutions, the device of this invention features low cost, high integration, and high power density, and provides a new path for wireless excitation of motors with limited end space, making it highly valuable for practical applications.

[0071] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments without departing from the scope of the present invention, based on the technical essence of the present invention and within the spirit and principles of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. An integrated device for wireless excitation and position detection of an electrically excited motor that reuses a rotary magnetic coupling mechanism, comprising a wireless power transmission component and a rotor position information detection component, characterized in that, The motor, rotor position information detection component and wireless energy transmission component are arranged from left to right. The rotor position information detection component and wireless energy transmission component are integrated structures. The wireless energy transmission component includes a primary side and a secondary side. The primary side includes a primary magnetic core skeleton (12), a primary magnetic core (13) and a primary winding (14), which are fixedly installed on the motor (40). The secondary side includes a secondary magnetic core skeleton (21), a secondary magnetic core (22), a secondary winding (23) and a secondary rotating circuit (24). The secondary magnetic core skeleton (21) is installed on the motor shaft (41) of the motor (40) and rotates with the motor shaft (41). The rotor position information detection component includes a resolver rotor and a resolver stator.

2. The integrated device for wireless excitation and position detection of an electrically excited motor using a multiplexed rotary magnetic coupling mechanism according to claim 1, characterized in that, An air gap (00) is left between the primary side and the secondary side.

3. The integrated device for wireless excitation and position detection of an electrically excited motor using a reusable rotary magnetic coupling mechanism as described in claim 1, characterized in that, The primary side magnetic core frame (12) is installed on the motor end cover (42) of the motor (40). The primary side magnetic core frame (12) has two cavities. One cavity is used to install the rotor position information detection component, and the other cavity is used to install the primary side magnetic core (13) and the primary side winding (14).

4. The integrated device for wireless excitation and position detection of an electrically excited motor using a reusable rotary magnetic coupling mechanism as described in claim 1, characterized in that, The secondary side magnetic core frame (21) is fixed on the motor shaft (41). The secondary side magnetic core frame (21) has two cavities. The secondary side magnetic core (22) and secondary side winding (23) are installed in one cavity, and the secondary side rotating circuit (24) is installed in the other cavity. The secondary side winding (23) is connected to the secondary side rotating circuit (24) through the wire hole in the secondary side magnetic core frame (21). One output terminal (25) of the secondary side rotating circuit (24) is connected to the excitation winding of the EESM for motor excitation, and the other output terminal (26) of the secondary side rotating circuit (24) is connected to the resolver rotor (33) of the rotor position information detection component for rotor position information detection.

5. The integrated device for wireless excitation and position detection of an electrically excited motor using a reusable rotary magnetic coupling mechanism according to claim 4, characterized in that, The resolver stator (32) of the rotor position information detection component is fixedly embedded in a cavity of the primary magnetic core skeleton (12). The terminals of the resolver stator (32) are connected to the external circuit through the through holes on the primary magnetic core skeleton (12). The resolver rotor (33) of the rotor position information detection component and the resolver stator (32) are radially concentrically distributed. The resolver rotor (33) is fixed on the motor shaft (41).

6. The integrated device for wireless excitation and position detection of an electrically excited motor using a reusable rotary magnetic coupling mechanism as described in claim 5, characterized in that, The resolver rotor (33) is a single-phase excitation winding, and the resolver stator (32) is a two-phase sine and cosine winding. When AC current is applied to the excitation winding of the resolver rotor (33), a sine and cosine outer envelope voltage is induced on the resolver stator (32), and the rotor position is detected by decoding.

7. A circuit applied to the apparatus of any one of claims 1 to 6, characterized in that, The system comprises two parts: a primary-side circuit module and a secondary-side circuit module. The primary-side circuit module is fixedly installed and includes a DC power supply, a high-frequency inverter, a primary-side compensation network, and a transmitting coil. The DC power supply is connected to the high-frequency inverter. The primary-side compensation network is integrated on the high-frequency inverter board, with its output connected to the primary-side compensation network, and the output of the primary-side compensation network connected to the transmitting coil. The secondary-side circuit module is mounted on the motor shaft and rotates with the motor. It includes a receiving coil, a secondary-side compensation network, a secondary-side rectifier circuit, an excitation winding, and a resolver rotor.

8. The integrated circuit for wireless excitation and position detection of an electrically excited motor using a multiplexed rotary magnetic coupling mechanism according to claim 7, characterized in that, The receiving coil of the secondary circuit module is connected to the secondary compensation network. The output of the secondary compensation network is connected to the secondary rectifier circuit for rectification. The rectified electrical energy is directly fed into the excitation winding of the EESM for excitation without the need for a filter capacitor. The output of the secondary compensation network is also connected to the resolver rotor to provide excitation voltage to the resolver rotor from the rotating side for rotor position information detection.

9. The integrated circuit for wireless excitation and position detection of an electrically excited motor using a multiplexed rotary magnetic coupling mechanism according to claim 7, characterized in that, The secondary rectifier circuit and the excitation winding are connected in series and belong to the same branch, while the resolver rotor belongs to another branch; both branches are powered by the output of the secondary compensation network and are in parallel.

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