Resolver signal generator convenient to carry and use and capable of adjusting number of pole pairs

Abstract

The invention relates to the technical field of resolver signal generators, and particularly discloses a portable resolver signal generator with adjustable pole pair number, which comprises a power supply module used for converting an external input power supply into multiple paths of voltage required by the resolver signal generator; the communication module is connected with the upper computer and is used for receiving an angle setting instruction and a pole pair number setting instruction from the upper computer; the signal acquisition module is used for acquiring an excitation signal sent by an external decoder; the signal generation module is respectively connected with the communication module and the signal acquisition module; the portable adjustable pole pair number rotary transformer signal generator is provided, 24V direct current power supply and miniaturized module integrated design are adopted, the test can be completed on site without an external fixed power supply, the on-site adaptability of equipment is improved, and on the premise that a rotary transformer in rigid connection with a motor rotating shaft is not disassembled, the test efficiency is improved, and the test cost is reduced. And the system is directly carried to an industrial site for troubleshooting.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of resolver signal generators, and particularly relates to a resolver signal generator with adjustable pole pairs, which is convenient to carry and use. BACKGROUND

[0002] As a high-precision electromagnetic induction position detection element, the resolver is often combined with a decoder to form a position detection system, and is widely used in servo motor driving, numerical control machine tools, industrial robots and other complex industrial sites. The core function of the resolver is to convert the mechanical rotation angle information into an analog electrical signal, and then the decoder demodulates and calculates the analog signal to output a digital angle signal for use by the control system. In this system, the working state of the resolver and the decoder directly determines the accuracy and reliability of the position detection. Once the system has a position detection deviation or signal anomaly, it is necessary to quickly locate the fault source, whether it is the resolver end (such as resolver winding damage, installation deviation, mechanical wear, etc.) or the decoder end (such as signal demodulation circuit failure, excitation signal anomaly, etc.), in order to shorten the equipment downtime.

[0003] According to the search, the publication No. CN115541949A discloses a resolver analog signal generating device, which includes a resolver carrier wave generating module, a resolver excitation generating module and a resolver analog signal generating module. The resolver carrier wave generating module is used to generate N-channel different rotation speed rotating magnetic field signals. By sampling the rotating magnetic field signals and channel gating, coarse channel cosine carrier wave signals and fine channel cosine carrier wave signals are output. The resolver excitation generating module is used to generate a resolver excitation signal with a set frequency. The resolver analog signal generating module is used to generate coarse channel cosine resolver analog signals according to the coarse channel cosine carrier wave signals and the resolver excitation signal, and to generate fine channel cosine resolver analog signals according to the fine channel cosine carrier wave signals and the cosine excitation signal.

[0004] The resolver is usually rigidly connected with the motor shaft, and the disassembly process requires disassembling multiple mechanical parts, which is time-consuming and laborious. Although the desktop resolver signal generator can provide analog signals, it is bulky, heavy and inconvenient to carry to the scene for testing. Engineers often use manual rotation of the resolver to troubleshoot, which can only roughly change the resolver angle by human power, cannot accurately control the angle parameters, and cannot simulate the resolver signals under different pole pairs. SUMMARY

[0005] The present application aims to provide a portable rotary transformer signal generator with adjustable pole pairs to solve the problem that rotary transformers are usually rigidly connected with motor shafts, and the disassembly process needs to disassemble multiple mechanical parts, which is time-consuming and laborious, and although bench rotary transformer signal generators can provide analog signals, they cannot be carried to the scene for testing, and if the rotary transformer angle is roughly changed by manually rotating the rotary transformer, the angle parameter cannot be accurately controlled, and the rotary transformer signal under different pole pairs cannot be simulated.

[0006] To achieve the above object, the present application provides the following technical solutions: A portable rotary transformer signal generator with adjustable pole pairs comprises: A power module is used to convert external input power into multiple voltages required by the rotary transformer signal generator. A communication module is connected with the host computer and is used to receive angle setting instructions and pole pair setting instructions from the host computer. A signal acquisition module is used to acquire excitation signals from an external decoder. A signal generation module is connected with the communication module and the signal acquisition module. The signal generation module comprises an ARM controller and a signal synthesis unit. The ARM controller is configured to perform the following operations: according to the angle setting instructions and the pole pair setting instructions received by the communication module, calculate the corresponding angle envelope digital signal; at the same time, according to the excitation signal acquired by the signal acquisition module, generate a control instruction for phase synchronization. The signal synthesis unit is configured to perform the following operations: receive the angle envelope digital signal and the synchronization control instruction generated by the ARM controller, convert the angle envelope digital signal into an analog voltage signal, and generate a carrier signal synchronized with the external excitation signal, then modulate the analog voltage signal onto the synchronized carrier signal, generate a rotary transformer analog signal and output it to the external decoder.

[0007] In one embodiment, the input end of the signal acquisition module is connected with the excitation signal output end of the external decoder.

[0008] In one embodiment, the signal acquisition module comprises: An excitation signal acquisition circuit is used to acquire the excitation signal of the external decoder. An RDC chip two is connected with the excitation signal acquisition circuit through the ARM controller. The excitation signal acquisition circuit is used to condition the acquired excitation signal.

[0009] In one embodiment, the ARM controller generates a digital signal containing pole pair number and angle information by performing digital operations, specifically by calculating the values ​​of sin(N×θ) and cos(N×θ) based on the pole pair number N and the angle θ.

[0010] In one embodiment, the ARM controller generates an angle envelope digital signal by calculating sine and cosine function values.

[0011] In one embodiment, the signal synthesis unit includes: The DAC chip is connected to the ARM controller via the SPI bus. It is used to receive the angle envelope digital signal sent by the ARM controller and convert it into the corresponding analog voltage signal. RDC chip one is connected to the ARM controller via the SPI bus. It is used to receive the synchronization control command sent by the ARM controller and generate a high-frequency sine wave carrier signal that is synchronized with the frequency and phase of the external excitation signal. The multiplier is connected to both the DAC chip and the RDC chip to perform analog multiplication on the analog voltage signal output by the DAC chip and the high-frequency sinusoidal carrier signal generated by the RDC chip, thereby achieving amplitude modulation and outputting an amplitude-modulated wave form of a resolver analog signal.

[0012] In a preferred embodiment, the multiplier is an analog multiplier integrated circuit that outputs a resolver analog signal in the form of an amplitude-modulated wave.

[0013] In a preferred embodiment, the RDC chip operates in excitation signal output mode.

[0014] In one embodiment, it also includes: The filtering unit, connected to the output of the multiplier, is used to perform low-pass filtering on the resolver analog signal output by the multiplier to filter out high-frequency harmonic noise generated by modulation.

[0015] In one embodiment, the filtering unit includes: A low-pass filter circuit, wherein the low-pass filter circuit adopts an active filter topology; A signal driving circuit, wherein the signal driving circuit adopts a voltage follower structure.

[0016] In one embodiment, the power module includes a primary voltage conversion unit and a secondary voltage regulation unit. The primary voltage conversion unit performs a preliminary conversion on the input DC voltage, and the secondary voltage regulation unit regulates the voltage after the preliminary conversion to generate the multiple voltages required by the resolver signal generator and to power the external decoder. The primary voltage conversion unit is a DC-DC converter, and the secondary voltage regulation unit is a low-dropout regulator, used to convert a 24V DC input into ±5V and 3.3V voltage outputs.

[0017] Compared with the prior art, the beneficial effects of the present invention are: By providing a portable adjustable pole-log number resolver signal generator, which adopts a 24V DC power supply and a miniaturized modular integrated design, testing can be completed on-site without the need for an external fixed power supply, improving the field adaptability of the equipment. It can be carried directly to the industrial site for troubleshooting without disassembling the resolver that is rigidly connected to the motor shaft.

[0018] The angle envelope signal is generated by performing digital calculations by the ARM controller. The pole pair number and angle parameters can be flexibly adjusted to simulate resolver signals under different pole pair numbers. The frequency and phase of the external decoder excitation signal are acquired and synchronized by the RDC chip, which can make the generated resolver analog signal highly consistent with the output characteristics of the real resolver. With the high-fidelity signal transmission of the filtering and drive unit, it is possible to accurately distinguish whether the fault source is at the resolver end or the decoder end.

[0019] The power module converts the 24V input to ±5V and 3.3V multiple voltages to power the external decoder, adapting to different power supply standards and meeting the power supply requirements of both the device itself and the external decoder. This simplifies the wiring process for on-site testing and improves the convenience of troubleshooting. Attached Figure Description

[0020] Fig. 1 This is a schematic diagram of the principle of the present invention.

[0021] Fig. 2 This is a flowchart of the phase synchronization control of the present invention.

[0022] Fig. 3 This is a circuit diagram of the excitation signal acquisition loop of the present invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figs. 1-3 A portable resolver signal generator with adjustable pole pairs includes: The power module is used to convert the external input power into multiple voltages required by the resolver signal generator; The communication module connects to the host computer and is used to receive angle setting instructions and pole pair setting instructions from the host computer. The signal acquisition module is used to acquire the excitation signal emitted by the external decoder; The signal generation module is connected to both the communication module and the signal acquisition module. The signal generation module includes an ARM controller and a signal synthesis unit; The ARM controller is configured to perform the following operations: calculate the corresponding angle envelope digital signal based on the angle setting instruction and pole pair setting instruction received by the communication module; and generate control instructions for phase synchronization based on the excitation signal acquired by the signal acquisition module. The signal synthesis unit is configured to perform the following operations: receive the angle envelope digital signal and synchronization control command generated by the ARM controller, convert the angle envelope digital signal into an analog voltage signal, generate a carrier signal synchronized with the external excitation signal, and then modulate the analog voltage signal onto the synchronized carrier signal to generate a resolver analog signal and output it to an external decoder.

[0025] Specifically, the power supply module converts the external input power into multiple voltages required for its own operation, powering each module; the communication module establishes a connection with the host computer, receives angle setting instructions and pole pair setting instructions from the host computer, and transmits them to the ARM controller; the signal acquisition module acquires the excitation signal from the external decoder and transmits it to the ARM controller; the ARM controller calculates the angle envelope signal corresponding to the pole pair number and angle according to the host computer instructions, and simultaneously implements phase synchronization control based on the acquired excitation signal to ensure the consistency of subsequent signals; the signal synthesis unit is connected to the ARM controller, synthesizes the angle envelope signal and the phase-synchronized excitation signal to generate a compliant resolver analog signal, and outputs this signal to the external decoder to simulate the resolver signal output and determine the fault source.

[0026] In the above technical solution, the resolver signal generator is portable and can be directly carried to the field for use. Troubleshooting can be carried out without disassembling the resolver equipment. Its adjustable pole pair function can be adapted to resolver-decoder systems of different specifications. Combined with phase synchronization control, it can provide accurate resolver analog signals. At the same time, it makes up for the lack of portability of large benchtop signal generators in laboratories. It can quickly and accurately locate the source of the fault as the resolver end or the decoder end, improving the efficiency and accuracy of on-site fault diagnosis. In addition, the multi-voltage output of the power module can simultaneously meet the power supply needs of itself and external decoders, further enhancing the convenience of on-site use.

[0027] In one embodiment, the input terminal of the signal acquisition module is connected to the excitation signal output terminal of the external decoder, directly receiving the excitation signal and its frequency and phase information provided by the external decoder. The signal acquisition module includes: an excitation signal acquisition circuit for acquiring the excitation signal from the external decoder; and an RDC chip two connected to the excitation signal acquisition circuit via an ARM controller. The excitation signal acquisition circuit conditions the acquired excitation signal. The RDC chip two does not perform frequency or phase measurements but works in conjunction with the RDC chip one to decode and verify the resolver analog signal output by the signal generation module, confirming the correctness of the signal simulation.

[0028] Furthermore, the frequency and phase of the excitation signal are directly provided by an external decoder. The signal acquisition module is only responsible for receiving and conditioning the signal and does not perform frequency or phase measurement functions. The phase-locked loop and phase synchronization functions are implemented by an external independent circuit or chip, and do not depend on the RDC chip.

[0029] In one embodiment, RDC chip two operates in resolver-to-digital conversion mode, but its function does not include measuring the frequency and phase of the excitation signal. Instead, it is used in conjunction with RDC chip one to decode the generated resolver analog signal to verify the accuracy of the signal simulation.

[0030] In one embodiment, the ARM controller generates a digital signal containing pole pair number and angle information by performing digital operations; the ARM controller generates an angle envelope digital signal by calculating the values ​​of sine and cosine functions, specifically by calculating the values ​​of sin(N×θ) and cos(N×θ) based on the pole pair number N and the angle θ.

[0031] Specifically, the ARM controller receives the pole pair parameter N and angle parameter θ from the host computer via the communication module, and simultaneously receives the excitation signal frequency and phase information from the external decoder transmitted by the signal acquisition module. For the generation of the angle envelope digital signal, the ARM controller has a built-in high-precision digital computing core, which uses the CORDIC algorithm to accurately calculate sin(N×θ) and cos(N×θ), and directly solves the polar coordinate to rectangular coordinate conversion through iterative calculation. During the calculation, the ARM controller uses the excitation signal frequency obtained from the external decoder as the clock reference to match the update frequency of the angle envelope signal, and at the same time, it fine-tunes the calculation results based on the phase information provided by the decoder to ensure that the angle envelope signal and the excitation signal are phase synchronized. The ARM controller transmits the two generated orthogonal digital signals (sin(N×θ) and cos(N×θ)) to the digital-to-analog conversion module of the signal synthesis unit to provide an accurate digital reference for subsequent analog signal modulation.

[0032] In the above technical solution, by directly multiplying the pole pair number N with the angle θ and then solving the trigonometric function, it can flexibly adapt to resolver-decoder systems with different pole pair number specifications. It can achieve multi-scenario compatibility by modifying the N value through the host computer without changing the hardware, thus improving the versatility of the equipment. This operation logic can accurately couple the pole pair number and angle information into the digital signal. With the high-speed computing power of the ARM controller, it can realize real-time dynamic adjustment of the angle envelope signal. It can respond quickly after the host computer issues angle or pole pair number commands. The digital operation method has stronger resistance to electromagnetic interference in industrial environments. The quantization error of the trigonometric function calculation can be controlled to a very small range through the high-performance computing core of the ARM, so that the generated angle envelope signal is highly consistent with the angle output characteristics of the real resolver.

[0033] In one embodiment, the signal synthesis unit includes: a DAC chip connected to an ARM controller via an SPI bus, used to receive an angle envelope digital signal sent by the ARM controller and convert it into a corresponding analog voltage signal; an RDC chip connected to the ARM controller via an SPI bus, used to receive a synchronization control command sent by the ARM controller and generate a high-frequency sinusoidal carrier signal synchronized with the frequency and phase of an external excitation signal; and a multiplier connected to both the DAC chip and the RDC chip, used to perform analog multiplication on the analog voltage signal output by the DAC chip and the high-frequency sinusoidal carrier signal generated by the RDC chip to achieve amplitude modulation and output a resolver analog signal in amplitude-modulated wave form; the multiplier is an analog multiplier integrated circuit that outputs a resolver analog signal in amplitude-modulated wave form. The RDC chip operates in excitation signal output mode.

[0034] Specifically, the ARM controller, based on instructions from the host computer and excitation signal parameters obtained from the external decoder, synchronously sends control signals to the DAC chip and RDC chip 1 in the signal synthesis unit. It transmits two orthogonal digital envelope signals, sin(N×θ) and cos(N×θ), to the DAC chip via the SPI bus, and simultaneously sends frequency and phase synchronization commands to the RDC chip 1. The parameters of these synchronization commands are directly set according to the frequency and phase of the excitation signal given by the external decoder. In excitation signal output mode, the RDC chip 1 starts its internal oscillator according to the synchronization commands, generating a high-frequency sine wave that is in phase and frequency with the excitation signal from the external decoder. The carrier signal, such as the 10kHz standard resolver excitation frequency, is directly transmitted to one input of the analog multiplier. After receiving the digital envelope signal, the DAC chip converts it into two corresponding analog voltage envelope signals through its internal digital-to-analog converter circuit and transmits them to the other input of the analog multiplier. Based on the analog modulation principle, the analog multiplier integrated circuit performs a multiplication operation on the two input signals, that is, the analog voltage envelope signal modulates the high-frequency sine wave carrier wave amplitude, and outputs a resolver analog signal in amplitude modulation form. This signal exactly matches the fine and coarse signal input requirements of the external decoder, completing the accurate analog output of the resolver signal.

[0035] In one embodiment, the system further includes: a filtering unit connected to the output of the multiplier, used to perform low-pass filtering on the resolver analog signal output by the multiplier to filter out high-frequency harmonic noise generated by modulation. The filtering unit includes: a low-pass filter circuit, which adopts an active filter topology; and a signal driving circuit, which adopts a voltage follower structure.

[0036] Specifically, the amplitude-modulated (AM) wave output from the multiplier is directly input to a low-pass filter circuit. This circuit employs an active filter topology, consisting of an integrated operational amplifier, precision resistors, and capacitors forming a closed-loop feedback circuit. The operational amplifier provides gain and active load capability, while the resistors and capacitors form an RC frequency selection network. By precisely matching the RC parameters, the filter cutoff frequency is set to 1.5-2 times the carrier frequency. For example, if the carrier frequency is 10kHz, the cutoff frequency is set to 15kHz, ensuring that the useful AM wave signal passes through without attenuation, while high-frequency noise and harmonics above the cutoff frequency are significantly attenuated. The AM wave signal after active low-pass filtering is then filtered. The analog signal is fed into the signal driving circuit, which uses an integrated operational amplifier (op-amp) as its core to form a voltage follower. The non-inverting input of the op-amp is connected to the filtered signal, and the inverting input is directly connected to the op-amp output to form a deep voltage series negative feedback. Based on the virtual short characteristic, the op-amp output voltage is equal to the voltage at the non-inverting input, achieving distortion-free signal amplitude transmission. At the same time, the deep negative feedback increases the circuit's input impedance to the megaohm level and reduces the output impedance to the milliohm level. The rectifier analog signal, after filtering and driving, is accurately input to the coarse / fine turn signal input port of the external decoder, completing the entire closed-loop chain from signal generation to reliable transmission. In one embodiment, the power module includes a primary voltage conversion unit and a secondary voltage regulation unit. The primary voltage conversion unit performs a preliminary conversion on the input DC voltage, and the secondary voltage regulation unit regulates the pre-converted voltage to generate the multiple voltages required by the resolver signal generator and to power the external decoder. The primary voltage conversion unit is a DC-DC converter, and the secondary voltage regulation unit is a low-dropout regulator used to convert the 24V DC input into ±5V and 3.3V voltage outputs.

[0037] In the above technical solution, firstly, an external 24V DC power supply is connected to the DC-DC converter of the primary voltage conversion unit. The DC-DC converter, based on the principle of switching power supply, converts the 24V high-voltage DC to an intermediate voltage of approximately ±5.5V through the high-frequency switching of the internal power switching transistor. Subsequently, the intermediate voltage is input to three sets of low-dropout regulators in the secondary voltage regulation unit. The low-dropout regulators form a deep negative feedback regulation loop through internal error amplifiers, adjustment transistors, and feedback resistors. For the positive voltage path, one low-dropout regulator accurately regulates the +5.5V intermediate voltage to +5V, and another regulates the +5.5V intermediate voltage. The voltage is regulated to 3.3V from either 5V or directly from a DC-DC converter. For negative voltage paths, a dedicated negative voltage low-dropout regulator regulates the -5.5V intermediate voltage to -5V. The three output voltages are precisely distributed: 3.3V supplies digital circuits such as the ARM controller, communication module, and digital signal processing section of the RDC chip; ±5V supplies analog circuits such as the RDC chip analog section of the signal acquisition module, the DAC chip analog section of the signal synthesis module, multipliers, and operational amplifiers of active filters; and +5V is output through a dedicated output interface to provide matching excitation power to external decoders.

[0038] like Fig. 3 As shown, the excitation signal acquisition circuit provided in this embodiment of the invention includes a signal conditioning circuit based on a dual operational amplifier chip. The signal conditioning circuit uses the operational amplifier chip AS2376 as its core to form a dual-channel signal processing circuit. Specifically, the circuit includes: Input section: Receives the excitation signal from an external decoder, labeled as the REFSYN signal input terminal; Core processing section: The first operational amplifier U8A forms the first signal conditioning channel, and a feedback network is formed through resistor R24 ​​(20kΩ) and resistor R26 (2.5kΩ) to set the gain characteristics of the channel; The input terminal is connected to the REFSYN signal via resistor R24; The output terminal generates a conditioned signal RDCREFFN_RL; The second operational amplifier U8B constitutes the second signal conditioning channel: A feedback network is formed by resistors R25 (100kΩ) and R27 (10kΩ); The input terminal is connected to the REFSYN signal via resistor R25; The output terminal generates a conditioned signal RDCREFF_RH; Reference voltage section: A precision reference voltage source, +REF2.5V (+2.5V), is used to provide bias voltage for the two operational amplifiers; A suitable common-mode voltage point is established using a resistor network (including R28, R29, R30, R31, and R32); Filtering section: Capacitor C68 (1nF) is connected between AGND and the signal path for high-frequency noise filtering; The excitation signal acquisition loop operates as follows: When the excitation signal from the external decoder is input through the REFSYN port, it undergoes signal conditioning via two operational amplifier channels, U8A and U8B. Channel U8A primarily buffers the signal and amplifies it to a specific gain, while channel U8B performs further signal conditioning and level matching. The differential signals RDCREFFN_RL and RDCREFF_RH output from the two channels are sent to the reference signal input of the resolver-to-digital converter chip two.

[0039] The working principle and usage process of this invention are as follows: First, connect an external 24V DC power supply. The device power module starts working, converting the input voltage into ±5V and 3.3V multiple voltages required by the system through a DC-DC converter and a low-dropout regulator. The +5V voltage simultaneously powers the external decoder. Next, connect to the host computer via the USB interface of the communication module to receive the user-set target angle θ and pole pair number N commands. Connect the decoder excitation output port to the excitation signal input terminal of the signal generator via a cable. The excitation signal acquisition circuit immediately starts working. The acquired REFSYN raw excitation signal is amplified and level-shifted by a signal conditioning circuit based on an AS2376 operational amplifier, and its frequency and phase information is transmitted to the ARM controller. The signal acquisition module transmits the excitation signal from the external decoder and its frequency and phase information to the ARM controller. The ARM controller processes two sets of data simultaneously. On one hand, based on the θ and N parameters sent by the host computer, it calculates sin(N×θ) and cos(θ) in real time using the CORDIC algorithm. On the one hand, the ARM controller generates a digital angle envelope signal (N×θ), and on the other hand, it generates a synchronization control command based on the frequency and phase data received from the external decoder. Then, the ARM controller sends commands to the DAC chip and RDC chip 1 of the signal synthesis unit via the SPI bus. The DAC chip converts the digital angle envelope signal into two analog voltage signals, while the RDC chip 1 generates a high-frequency sine wave carrier signal that is completely synchronized with the external excitation in the excitation signal output mode. The two signals are simultaneously input to the analog multiplier integrated circuit for modulation. The analog voltage signal modulates the synchronization carrier amplitude to generate an amplitude-modulated wave form of the resolver analog signal. After the signal passes through the filtering unit composed of an active low-pass filter circuit and a voltage follower to filter out high-frequency noise and enhance the driving capability, it is output to the coarse and fine machine signal input terminal of the external decoder through the decoder signal input port. At this time, the technician observes the angle value displayed by the decoder. If it is consistent with the value set by the host computer, the decoder is determined to be normal and the fault point is on the resolver side. If the display is abnormal, the decoder fault is confirmed, thus quickly and accurately completing the on-site fault location.

[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A portable and easy-to-use resolver signal generator with adjustable pole pairs, characterized in that, include: The power module is used to convert the external input power into multiple voltages required by the resolver signal generator; The communication module connects to the host computer and is used to receive angle setting instructions and pole pair setting instructions from the host computer. The signal acquisition module is used to acquire the excitation signal emitted by the external decoder; The signal generation module is connected to both the communication module and the signal acquisition module. The signal generation module includes an ARM controller and a signal synthesis unit; The ARM controller is configured to perform the following operations: calculate the corresponding angle envelope digital signal based on the angle setting instruction and pole pair setting instruction received by the communication module; and generate control instructions for phase synchronization based on the excitation signal acquired by the signal acquisition module. The signal synthesis unit is configured to perform the following operations: receive the angle envelope digital signal and synchronization control command generated by the ARM controller, convert the angle envelope digital signal into an analog voltage signal, generate a carrier signal synchronized with the external excitation signal, and then modulate the analog voltage signal onto the synchronized carrier signal to generate a resolver analog signal and output it to an external decoder.

2. The portable, adjustable pole pair resolver signal generator according to claim 1, characterized in that, The input terminal of the signal acquisition module is connected to the excitation signal output terminal of the external decoder.

3. The portable, adjustable pole pair resolver signal generator according to claim 2, characterized in that, The signal acquisition module includes: Excitation signal acquisition circuit, used to acquire excitation signals from an external decoder; RDC chip two is connected to the excitation signal acquisition circuit through an ARM controller; The excitation signal acquisition circuit is used to condition the acquired excitation signal.

4. The portable, adjustable pole pair resolver signal generator according to claim 1, characterized in that, The ARM controller generates a digital signal containing pole pair number and angle information by performing digital calculations.

5. The portable, adjustable pole pair resolver signal generator according to claim 4, characterized in that, The ARM controller generates an angle envelope digital signal by calculating the values ​​of the sine and cosine functions. Specifically, it calculates the values ​​of sin(N×θ) and cos(N×θ) based on the number of pole pairs N and the angle θ.

6. The portable, adjustable pole pair resolver signal generator according to claim 1, characterized in that, The signal synthesis unit includes: The DAC chip is connected to the ARM controller via the SPI bus. It is used to receive the angle envelope digital signal sent by the ARM controller and convert it into the corresponding analog voltage signal. RDC chip one is connected to the ARM controller via the SPI bus. It is used to receive the synchronization control command sent by the ARM controller and generate a high-frequency sine wave carrier signal that is synchronized with the frequency and phase of the external excitation signal. The multiplier is connected to both the DAC chip and the RDC chip to perform analog multiplication on the analog voltage signal output by the DAC chip and the high-frequency sinusoidal carrier signal generated by the RDC chip, thereby achieving amplitude modulation and outputting an amplitude-modulated wave form of a resolver analog signal.

7. The portable, adjustable pole pair resolver signal generator according to claim 6, characterized in that, The multiplier is an analog multiplier integrated circuit that outputs a resolver analog signal in the form of an amplitude-modulated wave.

8. The portable, adjustable pole pair resolver signal generator according to claim 6, characterized in that, The RDC chip operates in excitation signal output mode.

9. The portable, adjustable pole pair resolver signal generator according to claim 6, characterized in that, Also includes: The filtering unit, connected to the output of the multiplier, is used to perform low-pass filtering on the resolver analog signal output by the multiplier to filter out high-frequency harmonic noise generated by modulation.

10. The portable, adjustable pole pair resolver signal generator according to claim 9, characterized in that, The filtering unit includes: A low-pass filter circuit, wherein the low-pass filter circuit adopts an active filter topology; A signal driving circuit, wherein the signal driving circuit adopts a voltage follower structure.

11. The portable, adjustable pole pair resolver signal generator according to claim 1, characterized in that, The power module includes a primary voltage conversion unit and a secondary voltage regulation unit. The primary voltage conversion unit performs a preliminary conversion on the input DC voltage, and the secondary voltage regulation unit regulates the voltage after the preliminary conversion to generate the multiple voltages required by the resolver signal generator and to power the external decoder. The primary voltage conversion unit is a DC-DC converter, and the secondary voltage regulation unit is a low-dropout regulator, used to convert a 24V DC input into ±5V and 3.3V voltage outputs.

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