A wireless excitation and rotor position detection integrated device and circuit for a rotating transformer multiplexed electrically excited motor

Abstract

A wireless excitation and rotor position detection integrated device and circuit for a rotating transformer multiplexed electrically excited motor relates to a wireless excitation and rotor position detection integrated device and circuit for an electrically excited motor. The present application is to solve the problem that the existing wireless excitation mechanism and position sensor are set respectively, resulting in complex motor end structure, large axial size and high cost. The device comprises a primary side shell fixed on the motor end cover, and a primary side static side and a secondary side rotating side are arranged in the primary side shell; the primary side static side comprises a primary side magnetic core and a primary side multi-phase winding, and the primary side multi-phase winding is coaxially arranged in the primary side magnetic core; the secondary side rotating side comprises a secondary side single-phase winding, a secondary side magnetic core, a secondary side compensation, a rectifier circuit board and a secondary side shell, and the secondary side shell is fixedly arranged on the outer periphery of the motor rotating shaft and rotates synchronously with the rotor. The present application belongs to the technical field of wireless excitation and rotor position detection of electrically excited motor.

Description

Technical Field

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

[0002] Electrically Excited Synchronous Machines (EESMs) have shown promising application prospects in new energy vehicle drive systems and high-performance electric drive fields due to their independence from rare-earth permanent magnet materials and their advantages such as adjustable excitation, excellent field weakening speed-enhancing performance, and high high-speed operating efficiency. Existing EESMs typically use a carbon brush-slip ring mechanism to power the rotor excitation windings. While this technology is relatively mature, it is a contact-based power supply method, prone to mechanical wear, unstable contact, frequent maintenance, and limited service life during high-speed operation. This makes it difficult to meet the requirements of high reliability, low maintenance, and long lifespan in high-speed, high-power-density applications. Therefore, wireless excitation technology based on Wireless Power Transfer (WPT) is adopted. By setting a rotating magnetic coupling mechanism between the stationary and rotating sides, excitation energy is transferred non-contactly to the rotor excitation windings, effectively replacing the traditional carbon brush-slip ring structure and improving the reliability and operational stability of the motor system under high-speed conditions.

[0003] However, existing wireless excitation technology only solves the rotor excitation power supply problem. The motor control system still needs to rely on independent position sensors such as rotary transformers to obtain rotor position information. Therefore, the wireless excitation device and the position detection device usually need to be set separately at the motor shaft end and stacked axially. This solution has two main drawbacks: First, the separate stacked structure increases the axial length of the motor end and the number of additional components, which is not conducive to the miniaturization, lightweighting, and high power density design of the whole machine. For high-speed rotating systems, it also increases the difficulty of end structure design and dynamic balancing design, which is detrimental to mechanical reliability under high-speed operating conditions. Second, the position sensor usually requires the matching excitation circuit, signal conditioning circuit, and decoding circuit, thereby increasing the system hardware scale, number of interfaces, assembly complexity, and manufacturing cost, which is not conducive to improving system integration and operational reliability.

[0004] To address the problems of existing wireless excitation mechanisms and position sensors being separately installed, resulting in complex motor end structures, large axial dimensions, and high costs, this invention proposes an integrated device for wireless excitation and rotor position detection of an electrically excited motor based on a radial rotary transformer with a primary-side multiphase winding and a secondary-side single-phase winding. This device integrates wireless excitation energy transmission and rotor position detection functions into the same rotary transformer, eliminating the need for a separate wound rotary transformer or other position sensors. A rotating magnetic field with constant amplitude is generated by the primary-side multiphase windings to achieve stable wireless excitation of the rotor excitation windings. Simultaneously, utilizing the sinusoidal variation of the primary and secondary mutual inductance with rotor position, position information is modulated into the primary-side voltage, current, and back electromotive force signals. The rotor position information is obtained by sampling, synchronously demodulating, filtering, extracting the envelope, and calculating the angle of the primary-side signals. The position decoding employs a closed-loop decoding link, enabling continuous rotor position detection under static, low-speed, high-speed, and variable-speed conditions, and simultaneously obtaining rotor position and speed information without the need for a separate initial position detection device. Compared with the existing scheme of axially stacking wireless excitation devices and independent position detection devices, the present invention can reduce the number of motor end components, shorten the axial dimension, and increase the motor volume power density; it eliminates the need for the high-frequency excitation circuit required by traditional position sensors, thus reducing system costs; and it reduces the space occupied at the motor end, thereby improving mechanical reliability and dynamic balance performance under high-speed operating conditions. Summary of the Invention

[0005] To address the problems of existing wireless excitation mechanisms and position sensors being set up separately, resulting in complex motor end structures, large axial dimensions, and high costs, this invention proposes an integrated device and circuit for wireless excitation and rotor position detection of an electrically excited motor based on a rotary transformer reuse.

[0006] The technical solution adopted by the present invention to solve the above problems is as follows: The integrated device for wireless excitation and rotor position detection of an electrically excited motor based on rotary transformer reuse includes a primary side housing, which is fixed on the motor end cover. The primary side housing has a primary stationary side and a secondary rotating side inside. The primary stationary side includes a primary magnetic core and a primary multi-phase winding, which is coaxially arranged inside the primary magnetic core. The secondary rotating side includes a secondary single-phase winding, a secondary magnetic core, a secondary compensation and rectification circuit board, and a secondary side housing. The secondary side housing is fixedly arranged on the outer periphery of the motor shaft and rotates synchronously with the rotor. The secondary side housing is fixed to the motor shaft by a key connection.

[0007] Furthermore, the number of phases in the primary multiphase winding is ,and .

[0008] Furthermore, the primary and secondary magnetic cores form a radially distributed rotational coupling structure, and a radially coupled air gap is formed between the primary and secondary magnetic cores.

[0009] Furthermore, the primary multiphase winding and the secondary single-phase winding are concentrically arranged along the circumferential direction. The primary multiphase winding adopts a distributed winding, and the secondary single-phase winding adopts a sinusoidal winding. The primary windings of each phase of the primary multiphase winding are arranged along the circumferential direction according to electrical angles. Symmetrical arrangement.

[0010] Furthermore, the rectifier circuit board is a ring-shaped PCB circuit board located on the axial side of the secondary magnetic core. The secondary single-phase winding is electrically connected to the rectifier circuit board through leads, and the output end of the rectifier circuit board is electrically connected to the motor rotor excitation winding.

[0011] Furthermore, mutual inductance is formed between each phase of the secondary single-phase winding and the primary multi-phase winding. ,in , This indicates the number of phases in the primary multiphase winding and the mutual inductance between the windings. All of them change periodically with the rotor's mechanical angular position, and the electrical angles of adjacent sets of mutual inductances differ sequentially. .

[0012] The present invention discloses an integrated circuit for wireless excitation and rotor position detection of an electrically excited motor based on a rotary transformer multiplexing, comprising a primary circuit module and a secondary circuit module. The primary circuit module is disposed at the stationary end of the motor, and the secondary circuit module is fixedly disposed on the motor shaft. The primary-side circuit module includes a DC power supply, a high-frequency inverter, a primary-side compensation network, a primary-side multiphase winding, and a primary-side signal acquisition and position decoding module; the DC power supply is connected to the high-frequency inverter, the output of the high-frequency inverter is connected to the input of the primary-side compensation network, and the output of the primary-side compensation network is connected to the primary-side multiphase winding. The secondary circuit module includes a secondary single-phase winding, a secondary compensation network, a secondary rectifier circuit, and a motor rotor excitation winding. The output terminal of the secondary single-phase winding is connected to the input terminal of the secondary compensation network, the output terminal of the secondary compensation network is connected to the input terminal of the secondary rectifier circuit, and the output terminal of the secondary rectifier circuit is connected to the motor rotor excitation winding.

[0013] Furthermore, the primary-side signal acquisition and position decoding module includes a sampling unit, a reference synchronization unit, a synchronization demodulation unit, a filtering unit, an orthogonal reconstruction and normalization unit, a phase-locked loop (PLL) solution unit, and an angle compensation unit, which are connected in sequence. The sampling unit is used to synchronously and uniformly sample the primary-side multiphase current signal; The synchronous demodulation unit is used to synchronously demodulate the sampled phase signals; The filtering unit is used to extract the low-frequency envelope signal; The orthogonal reconstruction and normalization unit is used to obtain orthogonal components and perform amplitude normalization; The phase-locked loop (PLL) calculation unit is used to output rotor position angle and speed information; The angle compensation unit is used to perform fixed phase correction and delay compensation for the position angle.

[0014] The beneficial effects of this invention are: 1. This invention integrates the rotary magnetic coupling structure required for wireless excitation with the rotor position detection function into the same rotary coupling mechanism, eliminating the need for a separate position sensor or independent signal rotary transformer. This reduces the number of additional components at the motor end, shortens the axial dimension of the motor end, improves space utilization, and helps to increase the overall power density of the machine.

[0015] 2. This invention achieves the dual functions of energy transmission and position detection by reusing the same magnetic coupling mechanism and winding system, reducing the types of components, assembly steps and related auxiliary circuits, thereby helping to reduce system manufacturing costs, assembly costs and subsequent maintenance costs.

[0016] 3. This invention constructs a position decoding link based on primary-side sampling signals, encompassing synchronous demodulation, filtering, quadrature reconstruction, and phase-locked loop closed-loop tracking. This enables continuous rotor position detection under stationary, low-speed, high-speed, and variable-speed operating conditions, and can simultaneously output position angle and speed information. Because a unified position decoding link is used, there is no need to switch between different detection mechanisms in different speed ranges, thus achieving full-speed-domain position detection and improving the continuity, smoothness, and anti-interference capability of position detection.

[0017] 4. This invention does not require an additional independent initial position detection device, nor does it require pre-input of the actual rotor initial angle. The rotor initial position information is carried by the primary-side modulation signal itself, and is autonomously acquired and converged through synchronous demodulation, low-pass filtering, quadrature reconstruction, and phase-locked loop closed-loop tracking. At the same time, combined with compensation for filtering delay and phase error, the position detection accuracy under high-speed and dynamic conditions can be further improved. Attached Figure Description

[0018] Figure 1 This is a schematic diagram comparing the integrated solution of the wireless excitation and position detection device proposed in this invention with the traditional solution; Figure 2 This is a schematic diagram of the system circuit of the integrated device for primary-side multi-phase and secondary-side single-phase wireless excitation and position detection proposed in this invention; Figure 3 This is a schematic diagram and exploded view of the integrated three-phase primary and single-phase secondary device in Example 1; Figure 4 This is a schematic diagram of the cross-sectional structure of the integrated three-phase primary-single-phase secondary device in Example 1; Figure 5 This is a schematic diagram of the LCC-P system circuit of the primary-side three-phase-secondary-side single-phase integrated device in Example 1; Figure 6 This is a block diagram of the position sampling and calculation of the integrated primary-side three-phase and secondary-side single-phase device in Example 1; Figure 7 This is a schematic diagram and exploded view of the integrated primary-side two-phase and secondary-side single-phase device in Example 2; Figure 8 This is a schematic diagram of the cross-sectional structure of the integrated primary-side two-phase and secondary-side single-phase device in Example 2; Figure 9 This is a schematic diagram of the SS system circuit of the primary-side two-phase-secondary-side single-phase integrated device in Example 2; Figure 10 This is a block diagram of the position sampling and calculation of the integrated device of primary side two-phase and secondary side single-phase in Example 2. Detailed Implementation

[0019] Specific Implementation Method 1: The wireless excitation and rotor position detection integrated device for an electrically excited motor based on a radial rotary transformer multiplexing method described in this implementation method includes a primary side housing 31, which is fixed on the motor end cover. The primary side housing 31 has a primary side stationary side and a secondary side rotating side. The primary side stationary side includes a primary side magnetic core 11 and a primary side multiphase winding 12, which are coaxially arranged inside the primary side magnetic core 11. The secondary side rotating side includes a secondary side single-phase winding 21, a secondary side magnetic core 22, a secondary side compensation and rectifier circuit board 23, and a secondary side housing. The secondary side housing is fixedly arranged on the outer periphery of the motor shaft and rotates synchronously with the rotor. The secondary side housing is fixed to the motor shaft by a key connection.

[0020] The number of phases in the primary multiphase winding 12 is: ,and .

[0021] Among them, the primary magnetic core 11 and the secondary magnetic core 22 form a radially distributed rotational coupling structure, and a radially coupled air gap 00 is formed between the primary magnetic core 11 and the secondary magnetic core 22.

[0022] The primary multiphase winding 12 and the secondary single-phase winding 21 are concentrically arranged along the circumferential direction. The primary multiphase winding 12 is a distributed winding, and the secondary single-phase winding 21 is a sinusoidal winding. The primary windings of each phase of the primary multiphase winding 12 are arranged along the circumferential direction according to electrical angles. Symmetrical arrangement.

[0023] The rectifier circuit board 23 is a ring-shaped PCB circuit board disposed on the axial side of the secondary magnetic core 22. The secondary single-phase winding 21 is electrically connected to the rectifier circuit board 23 through leads. The output end of the rectifier circuit board 23 is electrically connected to the motor rotor excitation winding.

[0024] Among them, the secondary single-phase winding 21 and each phase of the primary multi-phase winding 12 form mutual inductance. ,in , This indicates the number of phases in the primary multiphase winding 12, and the mutual inductance between each winding. All of them change periodically with the rotor's mechanical angular position, and the electrical angles of adjacent sets of mutual inductances differ sequentially. .

[0025] Specific Implementation Method 2: The integrated circuit for wireless excitation and rotor position detection of an electrically excited motor based on rotary transformer reuse described in this implementation method includes a primary circuit module and a secondary circuit module. The primary circuit module is set at the stationary end of the motor, and the secondary circuit module is fixedly set on the motor shaft. The primary-side circuit module includes a DC power supply, a high-frequency inverter, a primary-side compensation network, a primary-side multiphase winding, and a primary-side signal acquisition and position decoding module; the DC power supply is connected to the high-frequency inverter, the output of the high-frequency inverter is connected to the input of the primary-side compensation network, and the output of the primary-side compensation network is connected to the primary-side multiphase winding. The secondary circuit module includes a secondary single-phase winding, a secondary compensation network, a secondary rectifier circuit, and a motor rotor excitation winding. The output terminal of the secondary single-phase winding is connected to the input terminal of the secondary compensation network, the output terminal of the secondary compensation network is connected to the input terminal of the secondary rectifier circuit, and the output terminal of the secondary rectifier circuit is connected to the motor rotor excitation winding.

[0026] The high-frequency inverter's output is connected to the primary-side compensation network for energy transmission. On the other hand, the primary-side signal acquisition and position decoding module is electrically connected to the sampling node on the primary-side inverter output side. It is used to acquire primary-side multiphase voltage signals, current signals, or equivalent back electromotive force signals, and to calculate the rotor position based on the sampled signals.

[0027] The position decoding module forms a closed-loop position decoding link. The position angle estimate output by the phase-locked loop (PLL) solution unit is fed back to the synchronization demodulation unit to construct a reference signal that is synchronized with the high-frequency excitation of the primary side.

[0028] The primary-side signal acquisition and position decoding module includes a sampling unit, a reference synchronization unit, a synchronization demodulation unit, a filtering unit, an orthogonal reconstruction and normalization unit, a phase-locked loop (PLL) solution unit, and an angle compensation unit, which are connected in sequence. The sampling unit is used to synchronously and uniformly sample the primary-side multiphase current signal; The synchronous demodulation unit is used to synchronously demodulate the sampled phase signals; The filtering unit is used to extract the low-frequency envelope signal; The orthogonal reconstruction and normalization unit is used to obtain orthogonal components and perform amplitude normalization; The phase-locked loop (PLL) calculation unit is used to output rotor position angle and speed information; The angle compensation unit is used to perform fixed phase correction and delay compensation for the position angle.

[0029] The system injects high-frequency current into the primary multiphase winding via a high-frequency inverter to establish a high-frequency rotating magnetic field. The secondary single-phase winding receives coupled energy, which, after compensation and rectification, supplies power to the motor rotor excitation winding. Furthermore, due to the periodic change in mutual inductance between the primary and secondary sides with the rotor position, the secondary current, after coupling, generates a position-related back electromotive force and equivalent reflected impedance change on the primary side, resulting in the primary electrical signal containing high-frequency carrier and low-frequency position modulation components. The system acquires rotor position and speed information by synchronously sampling, demodulating, filtering, quadraturely reconstructing, and performing phase-locked loop (PLL) calculations on the primary signal.

[0030] Example Example 1: like Figures 3 to 6 As shown in the figure, the wireless excitation and rotor position detection integrated device for an electrically excited motor based on a radial rotary transformer reused in this embodiment adopts an asymmetrical winding configuration of three-phase primary side and single-phase secondary side, and includes a wireless energy transmission part and a rotor position information detection part.

[0031] like Figure 3 and Figure 4 As shown in the figure, the wireless excitation and rotor position detection integrated device for an electrically excited motor based on a radial rotary transformer multiplexing, as described in this embodiment, includes a primary stationary side and a secondary rotating side. The primary stationary side includes a primary magnetic core 11 and a primary three-phase winding 12; the secondary rotating side includes a secondary magnetic core 22, a secondary single-phase winding 21, and a secondary rotating circuit board 23. The secondary rotating side housing is fixed to the motor shaft by a key connection, while the primary side housing 31 is fixed to the motor end cover or housing. A radial coupling air gap 00 exists between the primary stationary side and the secondary rotating side.

[0032] like Figure 3As shown, both the primary magnetic core 11 and the secondary magnetic core 22 adopt a ring-shaped toothed soft magnetic structure distributed along the circumferential direction. The primary three-phase winding 12 adopts a double-layer distributed winding, which is symmetrically arranged along the circumferential direction at an electrical angle of 120° to establish a three-phase rotating magnetic field with approximately constant amplitude. The secondary single-phase winding 21 adopts an equivalent sinusoidal winding that matches the number of pole pairs of the primary spatial fundamental wave. The pole slots of the primary and secondary sides adopt a non-equal slot and non-integer multiple near slot matching relationship to reduce the coupling of harmonics of the same order. By designing the pitch of the primary coil, higher-order spatial harmonics can be suppressed, so that the fundamental component of the air gap magnetic permeability dominates, thereby ensuring that the mutual inductance between the secondary single-phase winding and the primary A, B and C phase windings varies approximately sinusoidally with the rotor position and is staggered by 120° in electrical angle. Both the primary three-phase winding 12 and the secondary single-phase winding 21 adopt Litz wire windings.

[0033] The secondary rotating circuit board 23 is located on the axial side of the secondary magnetic core 22 and is used to integrate the secondary compensation circuit and the rectifier circuit. The secondary single-phase winding 21 is electrically connected to the secondary rotating circuit board 23 through leads. The output end of the secondary rotating circuit board 23 is electrically connected to the motor rotor excitation winding.

[0034] like Figure 5 As shown, the wireless excitation and rotor position detection integrated circuit for an electrically excited motor based on a radial rotary transformer multiplexing adopts an LCC-P type compensation topology, which can realize constant current output on the secondary side.

[0035] The integrated circuit for wireless excitation and rotor position detection of an electrically excited motor based on radial rotary transformer multiplexing includes a primary-side module and a secondary-side module. The primary-side circuit module is located at the stationary end of the motor and includes a DC power supply, a high-frequency inverter, a primary-side three-phase LCC compensation network, a primary-side three-phase winding 12, and a primary-side signal acquisition and position decoding module. The DC power supply is connected to the high-frequency inverter, the output of the high-frequency inverter is electrically connected to the input of the primary-side three-phase compensation network, and the output of the primary-side three-phase compensation network is electrically connected to the primary-side three-phase winding 12. The primary-side LCC compensation network includes a series compensation inductor. Parallel compensation capacitors Series compensation capacitor Primary windings of each phase It is connected to the corresponding series compensation branch and together with the parallel compensation branch, it forms a three-phase LCC resonant network.

[0036] like Figure 5 As shown, the secondary circuit module is mounted on the motor shaft and rotates synchronously with it. It includes a secondary single-phase winding 21, a secondary P-type compensation network, a secondary rectifier circuit, and a motor rotor excitation winding. The secondary P-type compensation network includes a compensation capacitor. The secondary-side uncontrolled rectifier circuit is integrated on a single circuit board, and the secondary-side receiving coil... With compensation capacitor The parallel-connected compensation network output is electrically connected to the input of the secondary rectifier circuit, and the output of the secondary rectifier circuit is electrically connected to the motor rotor excitation winding.

[0037] like Figure 6 As shown, the primary-side signal acquisition and position decoding module is electrically connected to the sampling node on the output side of the high-frequency inverter. It is used to acquire the primary-side three-phase current signal, the primary-side three-phase voltage signal, or the equivalent back electromotive force signal reconstructed from them, and to perform rotor position decoding based on the signals. The primary-side signal acquisition and position decoding module includes a sampling unit, a synchronous demodulation unit, a reference synchronization unit, a filtering unit, an orthogonal reconstruction and normalization unit, a phase-locked loop calculation unit, and an angle compensation unit connected in sequence.

[0038] In this embodiment, the secondary single-phase winding forms mutual inductance with the primary A-phase winding, B-phase winding, and C-phase winding, respectively. , and ,in Indicates the rotor's mechanical angular position, mutual inductance , and The mechanical angular position of the rotor changes periodically and is staggered by 120° in electrical angle.

[0039] During normal operation, the DC power supply injects three-phase high-frequency current into the primary three-phase windings via a high-frequency inverter to establish a rotating high-frequency magnetic field in the radially coupled air gap. Under the influence of this rotating high-frequency magnetic field, the secondary single-phase winding induces an AC voltage. After processing by the secondary compensation network and rectifier circuit, this voltage provides excitation current to the motor rotor excitation winding, thus achieving wireless excitation of the electrically excited motor. Simultaneously, due to the variation of the mutual inductance between the primary and secondary sides with the rotor position, the secondary side current, after coupling between the primary and secondary sides, forms a back electromotive force component in each phase of the primary side that is related to the rotor position. This component manifests as an equivalent reflected impedance that varies with the rotor position on the primary side. Therefore, the primary three-phase electrical signal contains a high-frequency carrier component and a low-frequency position modulation component.

[0040] like Figure 6As shown, in this embodiment, the position decoding module takes the primary three-phase modulation signal as input, performs synchronous and uniform sampling on the primary three-phase signal, and constructs a synchronous reference signal based on the high-frequency excitation signal. The sampled three-phase signal and the synchronous reference signal are synchronously demodulated, and the position component in the high-frequency modulation signal is shifted to the low-frequency baseband. After the demodulated signal is low-pass filtered, a three-phase low-frequency envelope signal corresponding to the rotor position is obtained. The three-phase low-frequency envelope signal is then subjected to coordinate transformation to obtain a stationary two-phase orthogonal position signal, and amplitude normalization is performed. The normalized orthogonal component is input to the phase-locked loop (PLL) solution unit. After phase detection, loop filtering and angle integration, the rotor position angle estimate and angular velocity estimate are output. The angle compensation unit is used to perform fixed phase correction and equivalent delay compensation on the position angle estimate to improve the position decoding accuracy.

[0041] In this embodiment, the position decoding adopts a closed-loop decoding method. The position angle estimate output by the phase-locked loop (PLL) unit participates in the construction of the synchronization reference signal, thereby forming a closed-loop decoding link of reference generation, synchronization demodulation, orthogonal reconstruction, and PLL correction. This decoding link can uniformly process the primary-side modulation signal under stationary, low-speed, high-speed, and variable-speed conditions, without the need to switch between different detection modes in different speed ranges, and can achieve continuous position detection across the entire speed domain.

[0042] This embodiment eliminates the need for a separate initial position detection device and pre-input of the actual rotor initial angle. The rotor initial position information is carried by the primary-side modulation signal itself and is autonomously captured and converged through a closed-loop decoding chain. Using this method, rotor position and speed information can be obtained simultaneously with wireless excitation, and it is beneficial for improving the continuity, stability, and anti-interference capability of position detection under dynamic operating conditions.

[0043] This embodiment, without the need for independent rotary transformers, encoders, or Hall position sensors, can simultaneously complete excitation energy transmission and rotor position information detection using the same primary-side three-phase to secondary-side single-phase rotary coupling mechanism. Compared to the scheme of axially stacking wireless excitation mechanisms and independent position detection devices, this embodiment can reduce the number of independent components at the motor end, shorten the axial dimension, reduce system cost and assembly complexity, and is beneficial to improving mechanical reliability and overall power density under high-speed operating conditions.

[0044] Example 2: like Figures 7 to 10 As shown, this embodiment provides an integrated wireless excitation and rotor position detection device for an electrically excited motor based on a radial rotary transformer. The device adopts an asymmetrical winding configuration of two phases on the primary side and one phase on the secondary side, and includes a wireless energy transmission section and a rotor position information detection section, without the need to set up a separate rotary transformer, encoder or Hall position sensor.

[0045] like Figure 7 and 8 As shown in the figure, the wireless excitation and rotor position detection integrated device for an electrically excited motor based on a radial rotary transformer multiplexing in this embodiment includes a primary stationary side and a secondary rotating side. The primary stationary side includes a primary magnetic core 11 and a primary two-phase winding 12; the secondary rotating side includes a secondary magnetic core 22, a secondary single-phase winding 21, and a secondary rotating circuit board 23. The secondary rotating side housing is fixed to the motor shaft by a key connection, while the primary side housing 31 is fixed to the motor end cover or housing. There is a radial coupling air gap 00 between the primary stationary side and the secondary rotating side.

[0046] like Figure 7 As shown, both the primary magnetic core 11 and the secondary magnetic core 22 adopt a ring-shaped toothed soft magnetic structure distributed along the circumferential direction. The primary two-phase winding 12 adopts a double-layer distributed winding, which is symmetrically arranged along the circumferential direction at an electrical angle of 90° to establish a two-phase rotating magnetic field with an approximately constant amplitude. The secondary single-phase winding 21 adopts an equivalent sinusoidal winding that matches the number of pole pairs of the primary spatial fundamental wave. The pole slots of the primary and secondary sides adopt a non-equal slot and non-integer multiple near slot matching relationship to reduce the coupling of harmonics of the same order. By designing the pitch of the primary coil, higher-order spatial harmonics can be suppressed, so that the fundamental component of the air gap magnetic permeability dominates, thereby ensuring that the mutual inductance between the secondary single-phase winding and the primary two-phase winding changes approximately sinusoidally with the rotor position and differs by 90° in electrical angle. Both the primary two-phase winding 12 and the secondary single-phase winding 21 adopt Litz wire windings.

[0047] The secondary rotating circuit board 23 is located on the axial side of the secondary magnetic core 22 and is used to integrate the secondary compensation circuit and the rectifier circuit. The secondary single-phase winding 21 is electrically connected to the secondary rotating circuit board 23 through leads. The output end of the secondary rotating circuit board 23 is electrically connected to the motor rotor excitation winding.

[0048] like Figure 9 As shown in the figure, the wireless excitation and rotor position detection integrated circuit for an electrically excited motor based on a radial rotary transformer multiplexing described in this embodiment adopts an SS-type compensation topology.

[0049] The integrated circuit for wireless excitation and rotor position detection of an electrically excited motor based on radial rotary transformer multiplexing includes a primary-side module and a secondary-side module. The primary-side circuit module is located at the stationary end of the motor and includes a DC power supply, a high-frequency inverter, a primary-side two-phase S-type compensation network, a primary-side two-phase winding 12, and a primary-side signal acquisition and position decoding module. The DC power supply is connected to the high-frequency inverter, and the output terminal of the high-frequency inverter is electrically connected to the input terminal of the primary-side two-phase compensation network. The output terminal of the primary-side two-phase compensation network is electrically connected to the primary-side two-phase winding 12. The primary-side two-phase S-type compensation network includes a series compensation capacitor connected in series with the A-phase primary winding. and the series compensation capacitor connected in series with the primary winding of phase B. A-phase primary winding With series compensation capacitor The A-phase series resonant branch is formed, and the B-phase primary winding... With series compensation capacitor This forms a B-phase series resonant branch, and the two branches together form a primary-side two-phase S-type resonant network.

[0050] The secondary circuit module is mounted on the motor shaft and rotates synchronously with it. It includes a secondary single-phase winding 21, a secondary S-type compensation network, a secondary rectifier circuit, and a motor rotor excitation winding. The secondary S-type compensation network includes a series compensation capacitor connected in series with the secondary single-phase winding 21. Secondary single-phase winding With series compensation capacitor The secondary-side series resonant branch is formed, and the output terminal of the secondary-side S-type compensation network is electrically connected to the input terminal of the secondary-side rectifier circuit, while the output terminal of the secondary-side rectifier circuit is electrically connected to the motor rotor excitation winding. The secondary-side S-type compensation network and the secondary-side rectifier circuit are preferably integrated on the secondary-side rotating circuit board 23.

[0051] like Figure 9 As shown, the primary-side signal acquisition and position decoding module is electrically connected to the sampling node on the output side of the high-frequency inverter. It is used to acquire the primary-side two-phase current signal, the primary-side two-phase voltage signal, or the equivalent back electromotive force signal reconstructed from them, and to perform rotor position decoding based on these signals. The primary-side signal acquisition and position decoding module includes, in sequence, a sampling unit, a reference synchronization unit, a synchronization demodulation unit, a filtering unit, an orthogonal reconstruction and normalization unit, a phase-locked loop (PLL) calculation unit, and an angle compensation unit.

[0052] In this embodiment, mutual inductance is formed between the secondary single-phase winding and the primary A-phase winding and B-phase winding, respectively. and ,in The rotor mechanical angular position is defined as follows. Both sets of mutual inductances change periodically with the rotor mechanical angular position and are 90° out of phase in electrical angle.

[0053] When the device is operating normally, the DC power supply injects two-phase high-frequency current into the two-phase primary winding via a high-frequency inverter to establish a rotating high-frequency magnetic field in the radially coupled air gap. The single-phase secondary winding induces an AC voltage under the influence of this rotating high-frequency magnetic field. After processing by the secondary S-type compensation network and rectifier circuit, this voltage provides excitation current to the motor rotor excitation winding, thus achieving wireless excitation of the electrically excited motor. In this embodiment, by matching the compensation parameters of the primary and secondary sides, the system operates in a resonant state near the operating frequency, thereby achieving constant current output on the secondary side to meet the rotor excitation winding's requirement for stable excitation current. Since the mutual inductance between the primary and secondary sides changes with the rotor position, the current on the secondary side, after coupling between the primary and secondary sides, forms a back electromotive force component related to the rotor position in the two phases of the primary side. This component manifests as a change in equivalent reflected impedance on the primary side, varying with the rotor position, resulting in the primary two-phase signal simultaneously containing a high-frequency carrier component and a low-frequency position modulation component.

[0054] like Figure 10 As shown, in this embodiment, the position decoding module takes the primary-side two-phase modulation signal as input, performs synchronous and uniform sampling on the primary-side two-phase signal, and constructs a synchronization reference signal based on the high-frequency excitation signal. The sampled two-phase signal is synchronously demodulated with the synchronization reference signal, shifting the position component in the high-frequency modulation signal to the low-frequency baseband. After low-pass filtering, the demodulated signal yields a two-phase low-frequency envelope signal corresponding to the rotor position. The two-phase low-frequency envelope signal is then orthogonally corrected to obtain a stationary two-phase orthogonal position signal, which is then normalized in amplitude. The normalized orthogonal components are input to the phase-locked loop (PLL) calculation unit, and after phase detection, loop filtering, and angle integration, output rotor position angle estimates and angular velocity estimates. The angle compensation unit performs fixed phase correction and equivalent delay compensation on the position angle estimates to improve position decoding accuracy.

[0055] In this embodiment, the position decoding adopts a closed-loop decoding method. The position angle estimate output by the phase-locked loop (PLL) unit participates in the construction of the synchronization reference signal, thereby forming a closed-loop decoding link of reference generation, synchronization demodulation, quadrature correction, and PLL correction. This decoding link can uniformly process the primary-side modulation signal under stationary, low-speed, high-speed, and variable-speed conditions, without the need to switch between different detection modes in different speed ranges, and can achieve continuous position detection across the entire speed domain.

[0056] This embodiment eliminates the need for a separate initial position detection device and pre-input of the actual rotor initial angle. The rotor initial position information is carried by the primary-side modulation signal itself and is autonomously captured and converged by the closed-loop decoding chain. Using this method, rotor position and speed information can be obtained simultaneously with wireless excitation, and it is beneficial for improving the continuity, stability, and anti-interference capability of position detection under dynamic operating conditions.

[0057] This embodiment, without the need for independent rotary transformers, encoders, or Hall position sensors, can simultaneously complete excitation energy transmission and rotor position information detection using the same primary-side two-phase to secondary-side single-phase rotary coupling mechanism. Compared to the scheme of axially stacking wireless excitation mechanisms and independent position detection devices, this embodiment can reduce the number of independent components at the motor end, shorten the axial dimension, reduce system cost and assembly complexity, and is beneficial to improving mechanical reliability and overall power density under high-speed operating conditions.

[0058] 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 rotor position detection of an electrically excited motor based on a rotary transformer multiplexing method, characterized in that, The device includes a primary side housing (31), which is fixed on the motor end cover. The primary side housing (31) has a primary stationary side and a secondary rotating side inside. The primary stationary side includes a primary magnetic core (11) and a primary multiphase winding (12), which is coaxially arranged inside the primary magnetic core (11). The secondary rotating side includes a secondary single-phase winding (21), a secondary magnetic core (22), a secondary compensation and rectifier circuit board (23), and a secondary side housing. The secondary side housing is fixed on the outer periphery of the motor shaft and rotates synchronously with the rotor. The secondary side housing is fixed on the motor shaft by a key connection.

2. The integrated wireless excitation and rotor position detection device for an electrically excited motor based on a rotary transformer multiplexing according to claim 1, characterized in that, The number of phases of the primary multiphase winding (12) is ,and .

3. The integrated wireless excitation and rotor position detection device for an electrically excited motor based on a rotary transformer multiplexing according to claim 1, characterized in that, The primary magnetic core (11) and the secondary magnetic core (22) form a radially distributed rotational coupling structure, and a radially coupled air gap (00) is formed between the primary magnetic core (11) and the secondary magnetic core (22).

4. The integrated wireless excitation and rotor position detection device for an electrically excited motor based on a rotary transformer multiplexing according to claim 1, characterized in that, The primary multiphase winding (12) and the secondary single-phase winding (21) are concentrically arranged along the circumferential direction. The primary multiphase winding (12) adopts a distributed winding, and the secondary single-phase winding (21) adopts a sinusoidal winding. The primary windings of each phase of the primary multiphase winding (12) are arranged along the circumferential direction according to electrical angles. Symmetrical arrangement; The mutual inductance between each phase of the secondary single-phase winding (21) and the primary multi-phase winding (12) varies approximately sinusoidally with the rotor position.

5. The integrated wireless excitation and rotor position detection device for an electrically excited motor based on a rotary transformer multiplexing according to claim 1, characterized in that, The rectifier circuit board (23) is a ring-shaped PCB circuit board set on the axial side of the secondary magnetic core (22). The secondary single-phase winding (21) is electrically connected to the rectifier circuit board (23) through leads. The output end of the rectifier circuit board (23) is electrically connected to the motor rotor excitation winding.

6. The integrated wireless excitation and rotor position detection device for an electrically excited motor based on a rotary transformer multiplexing according to claim 1, characterized in that, The secondary single-phase winding (21) and each phase of the primary multi-phase winding (12) form mutual inductance. ,in , This indicates the number of phases in the primary multiphase winding (12). Indicates the rotor's mechanical angular position, and the mutual inductance of each group. All of them change periodically with the rotor's mechanical angular position, and the electrical angles of adjacent sets of mutual inductances differ sequentially. .

7. A circuit based on the apparatus of any one of claims 1 to 5, characterized in that, It includes a primary circuit module and a secondary circuit module. The primary circuit module is located at the stationary end of the motor, and the secondary circuit module is fixedly mounted on the motor shaft. The primary-side circuit module includes a DC power supply, a high-frequency inverter, a primary-side compensation network, a primary-side multiphase winding, and a primary-side signal acquisition and position decoding module; the DC power supply is connected to the high-frequency inverter, the output of the high-frequency inverter is connected to the input of the primary-side compensation network, and the output of the primary-side compensation network is connected to the primary-side multiphase winding. The secondary circuit module includes a secondary single-phase winding, a secondary compensation network, a secondary rectifier circuit, and a motor rotor excitation winding. The output terminal of the secondary single-phase winding is connected to the input terminal of the secondary compensation network, the output terminal of the secondary compensation network is connected to the input terminal of the secondary rectifier circuit, and the output terminal of the secondary rectifier circuit is connected to the motor rotor excitation winding.

8. The integrated circuit for wireless excitation and rotor position detection of an electrically excited motor based on a rotary transformer multiplexing, as described in claim 7, is characterized in that... The primary-side signal acquisition and position decoding module includes a sampling unit, a reference synchronization unit, a synchronization demodulation unit, a filtering unit, an orthogonal reconstruction and normalization unit, a phase-locked loop (PLL) solution unit, and an angle compensation unit, which are connected in sequence. The sampling unit is used to synchronously and uniformly sample the primary-side multiphase current signal; The synchronous demodulation unit is used to synchronously demodulate the sampled phase signals; The filtering unit is used to extract the low-frequency envelope signal; The orthogonal reconstruction and normalization unit is used to obtain orthogonal components and perform amplitude normalization; The phase-locked loop (PLL) calculation unit is used to output rotor position angle and speed information; The angle compensation unit is used to perform fixed phase correction and delay compensation for the position angle.

9. The integrated circuit for wireless excitation and rotor position detection of an electrically excited motor based on a rotary transformer multiplexing, as described in claim 7, is characterized in that... The output of the high-frequency inverter is connected to the primary compensation network on one hand, and is used to inject high-frequency excitation current into the primary multiphase winding (12) and perform wireless excitation energy transmission; on the other hand, the primary signal acquisition and position decoding module is electrically connected to the sampling node on the primary inverter output side, and is used to acquire the primary multiphase voltage signal, the primary multiphase current signal or the equivalent back electromotive force signal, and perform rotor position calculation based on the position modulation component in the sampling signal.

10. The integrated circuit for wireless excitation and rotor position detection of an electrically excited motor based on a rotary transformer multiplexing, as described in claim 8 or 9, is characterized in that... The primary-side signal acquisition and position decoding module forms a closed-loop position decoding link. The position angle estimation value output by the phase-locked loop calculation unit is fed back to the reference synchronization unit or the synchronization demodulation unit to construct a demodulation reference signal synchronized with the primary-side high-frequency excitation. The calculated rotor position angle is then corrected by a fixed phase and compensated for delay by an angle compensation unit to output rotor position angle and speed information for motor control.

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