Broadband electromagnetic noise suppression regulation and control method of motor

Abstract

The invention discloses a broadband electromagnetic noise suppression regulation and control method of a motor, which is applied to a master-slave heterogeneous winding motor, and comprises the following steps: an electromagnetic noise suppression step S1, monitoring current harmonics of a main winding in real time, and calculating and generating a slave winding compensation current reference value according to parameters of the current harmonics of the main winding in combination with parameters of the master-slave heterogeneous winding motor; s2, compensating current is injected into the slave winding according to the slave winding compensating current reference value, the corresponding harmonic electromagnetic force of the main winding is offset through high-frequency harmonic current, and electromagnetic noise suppression is achieved; an electromagnetic noise regulation and control step: T1, calculating a harmonic current parameter needing to be injected into the main winding according to an electromagnetic noise frequency spectrum to be regulated and controlled; and T2, high-frequency harmonic current corresponding to the harmonic current parameter is injected into the main winding to generate electromagnetic noise with corresponding frequency, and spectrum regulation and control of the electromagnetic noise are realized. The broadband electromagnetic noise suppression and regulation of the motor can be realized, and the suppression and regulation effects are good.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and particularly relates to a method for suppressing and regulating broadband electromagnetic noise of a motor. Background Art

[0002] Motors are widely used in various industries due to their advantages such as high efficiency, low emissions, and simple maintenance. However, modern motor control methods result in high-frequency harmonic components in the motor windings, thereby generating electromagnetic noise. Higher requirements for the noise performance of motors are put forward in fields such as aerospace and electric vehicles. The optimization objects of existing research mainly focus on single-winding motors, and the research mainly focuses on mechanical structure optimization, which has a good effect on suppressing mechanical noise, but cannot effectively suppress the electromagnetic noise of the motor; there is also research proposing a method of harmonic injection, but limited by the control loop bandwidth, the injected harmonic frequency is low, and it cannot effectively suppress high-frequency electromagnetic noise. At the same time, existing methods cannot perform broadband electromagnetic noise regulation. Therefore, how to propose a strategy for suppressing electromagnetic noise of motors is a problem that needs to be solved by those skilled in the art. Summary of the Invention

[0003] The purpose of the present invention is to provide a method for suppressing and regulating broadband electromagnetic noise of a motor. The present invention can achieve the suppression and regulation of broadband electromagnetic noise of the motor, with good suppression and regulation effects and convenient operation.

[0004] The technical solution provided by the present invention is as follows: A method for suppressing and regulating broadband electromagnetic noise of a motor, which is applied to a master-slave heterogeneous winding motor, includes:

[0005] Steps for suppressing electromagnetic noise:

[0006] S1. Real-time monitor the current harmonics of the main winding, and calculate and generate a reference value for the compensation current of the secondary winding according to the parameters of the current harmonics of the main winding and in combination with the parameters of the master-slave heterogeneous winding motor;

[0007] S2. Based on the broadband current spectrum regulation method, inject a compensation current into the secondary winding according to the reference value of the compensation current of the secondary winding. This compensation current is a high-frequency harmonic current, and the harmonic electromagnetic force generated by the high-frequency harmonic current cancels the corresponding harmonic electromagnetic force of the main winding to achieve electromagnetic noise suppression;

[0008] Steps for regulating electromagnetic noise:

[0009] T1. Calculate the parameters of the harmonic current to be injected into the main winding according to the electromagnetic noise spectrum to be regulated;

[0010] T2. Inject a high-frequency harmonic current corresponding to the harmonic current parameters into the main winding to generate electromagnetic noise of the corresponding frequency to achieve the spectrum regulation of electromagnetic noise.

[0011] The above-mentioned wide-band electromagnetic noise suppression and regulation method for the motor, wherein the master-slave heterogeneous winding motor is a dual-winding permanent magnet synchronous motor, and the master-slave heterogeneous winding motor includes a main winding and a slave winding that are asymmetric and whose centers are not connected; the main winding operates in a low-frequency state and bears the main power, and the slave winding operates in a high-frequency state to compensate for the performance of the main winding.

[0012] The above-mentioned wide-band electromagnetic noise suppression and regulation method for the motor, wherein the electromagnetic noise is caused by the electromagnetic force harmonics inside the motor. Among them, the electromagnetic force includes the electromagnetic force generated by the interaction between the fundamental magnetomotive force of the permanent magnet and the harmonics of the main and slave windings, and the electromagnetic force generated by the interaction between the fundamental magnetomotive force of the stator and the harmonics of the main and slave windings; the corresponding relationship between the electromagnetic noise and the frequency of the main winding current harmonics is: the frequency of the current harmonics in the rotating coordinate system is the same as the frequency of the actual electromagnetic noise.

[0013] The above-mentioned wide-band electromagnetic noise suppression and regulation method for the motor, in step S1, the parameters of the main winding current harmonics are frequency, amplitude and phase, and the parameter of the master-slave heterogeneous winding motor is the turn ratio of the main winding to the slave winding.

[0014] The above-mentioned wide-band electromagnetic noise suppression and regulation method for the motor, in step S1, the reference value of the compensation current of the slave winding is calculated by the following formula:

[0015]

[0016] where, i vd1 and i vq1 are the currents of the main winding under the direct axis and the quadrature axis in the rotating coordinate system respectively, i vd2 and i vq2 are the currents of the slave winding under the direct axis and the quadrature axis in the rotating coordinate system respectively, N r is the turn ratio of the main winding to the slave winding.

[0017] The above-mentioned wide-band electromagnetic noise suppression and regulation method for the motor, in steps S2 and T1, the wide-band current spectrum regulation method is used to inject the wide-band high-frequency harmonic current into the windings of the master-slave heterogeneous winding motor without distortion.

[0018] The above-mentioned wide-band electromagnetic noise suppression and regulation method for the motor, for the distortion-free injection of the high-frequency harmonic current, the actual control method of the main and slave windings and the reference value of the compensation current meet the following requirements:

[0019] The high-frequency harmonic current to be injected into the slave winding is a sine wave with an amplitude of I inj , and an angular frequency of ω inj ; the main winding and the slave winding use the current loop as the inner control loop, and the output of the current loop is the voltage reference quantity in the rotating coordinate system; the voltage superimposed on the voltage input of the SVPWM modulation module on the d-axis or q-axis of the main winding and the slave winding should meet the following relationship:

[0020]

[0021] The high-frequency harmonic current to be injected into the main winding is a sine wave with an amplitude of I inj and an angular frequency of ω inj ; the main winding and the secondary winding use a current loop as the inner control loop, and the output of the current loop is the voltage reference quantity in the rotating coordinate system; the voltage superimposed on the voltage input of the SVPWM modulation module on the d-axis or q-axis of the main winding and the secondary winding should satisfy the following relationship:

[0022]

[0023] where u 1_comp is the superimposed voltage on the d-axis or q-axis of the main winding in the rotating coordinate system, u 2_comp is the superimposed voltage on the d-axis or q-axis of the secondary winding in the rotating coordinate system, ω c1 is the cut-off frequency of the current loop of the main winding, ω c2 is the cut-off frequency of the current loop of the secondary winding, M is the mutual inductance between the main winding and the secondary winding on the d-axis or q-axis in the rotating coordinate system, L1 is the inductance of the main winding on the d-axis or q-axis in the rotating coordinate system, L2 is the inductance of the secondary winding on the d-axis or q-axis in the rotating coordinate system, and t is time.

[0024] For the above-mentioned broadband electromagnetic noise suppression and regulation method of the motor, the regulation frequency of the electromagnetic noise is consistent with the frequency of the high-frequency harmonic current injected into the main winding.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. By real-time monitoring the harmonic situation of the main winding current, calculating the reference value of the compensation current of the secondary winding according to the main winding current harmonics and the relevant parameters of the main-secondary heterogeneous winding motor, and injecting the compensation current into the secondary winding without distortion using the broadband current spectrum regulation method, the high-frequency harmonic current injected into the secondary winding cancels out the corresponding harmonic electromagnetic force of the main winding, effectively reducing the electromagnetic noise generated during the operation of the motor.

[0027] 2. Calculating the parameters of the harmonic current to be injected according to the electromagnetic noise spectrum to be regulated, and injecting the high-frequency harmonic current into the main winding without distortion, corresponding electromagnetic noise can be generated, thereby realizing the regulation of the electromagnetic noise spectrum and meeting the specific requirements for the electromagnetic noise spectrum of the motor in different scenarios.

[0028] 3. Compared with the harmonic injection noise reduction scheme for single-winding motors, the present invention has a wider spectrum regulation range, can suppress electromagnetic noise with a wider spectrum, and has a higher degree of electromagnetic noise suppression. In addition, when the present invention realizes the noise reduction function, the harmonics are not directly injected into the main winding. The main winding operates at a low frequency and bears the main power, while the secondary winding operates at a high frequency to assist in compensating the performance of the main winding. The two work together without interference, ensuring the normal operation of the main winding.

[0029] 4. The present invention can inject current harmonics with a wide frequency range, especially harmonic frequencies higher than the bandwidth of the winding current loop, into the windings of the master-slave heterogeneous winding motor without distortion, while not affecting the system stability, and has good compatibility with the existing motor system, facilitating popularization and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic structural diagram of the master-slave heterogeneous winding motor based on the present invention.

[0031] Figure 2 It is a process flow chart of a wide-band electromagnetic noise suppression and regulation method for a motor provided by the present invention.

[0032] Figure 3 It is a control block diagram of the wide-band current spectrum regulation technology based on the present invention.

[0033] Figure 4 It is a motor vibration spectrum diagram under normal operating conditions of the present invention.

[0034] Figure 5 It is a diagram of the experimental results of electromagnetic noise spectrum regulation of the present invention.

[0035] Figure 6 It is a diagram of the electromagnetic noise spectrum before suppression in the electromagnetic noise suppression experiment of the present invention.

[0036] Figure 7 It is a diagram of the electromagnetic noise spectrum after suppression in the electromagnetic noise suppression experiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The following further describes the present invention with reference to the drawings and embodiments, but it shall not be used as a basis for limiting the present invention.

[0038] Embodiment: A wide-band electromagnetic noise suppression and regulation method for a motor, which is applied to a master-slave heterogeneous winding motor. Referring to Figure 1 , Figure 1 is a schematic structural diagram of the master-slave heterogeneous winding motor, ABC is the main winding, DEF is the secondary winding, α is the spatial angle difference between the two windings, N r is the turn ratio of the main winding to the secondary winding, θ is the angle difference between the rotor and the A-phase winding, the direction of the permanent magnet flux linkage is defined as the d-axis, and the direction 90 degrees ahead of the d-axis is defined as the q-axis;

[0039] For the main - auxiliary heterogeneous winding motor, the two sets of stator windings are asymmetric and the center points are not connected. The main winding operates at a low - frequency state and bears the main power; the auxiliary winding operates at a high - frequency state to achieve the auxiliary function of compensating for the relevant performance of the main winding.

[0040] Refer to Figure 2 , Figure 2 which is the flowchart of the implementation process of the present invention and includes:

[0041] The corresponding relationship between the electromagnetic noise and the harmonic frequency of the main - winding current is established;

[0042] The electromagnetic noise is caused by the electromagnetic force harmonics inside the motor. Among them, the electromagnetic force includes the electromagnetic force generated by the interaction between the fundamental magnetomotive force of the permanent magnet and the harmonics of the main - auxiliary windings, and the electromagnetic force generated by the interaction between the fundamental magnetomotive force of the stator and the harmonics of the main - auxiliary windings; the corresponding relationship between the electromagnetic noise and the harmonic frequency of the main - winding current is that the frequency of the current harmonics in the rotating coordinate system is consistent with the frequency of the actual electromagnetic noise.

[0043] Steps for suppressing electromagnetic noise:

[0044] S1. Monitor the current harmonics of the main winding in real - time. According to the parameters of the main - winding current harmonics and in combination with the parameters of the main - auxiliary heterogeneous winding motor, calculate and generate the reference value of the compensating current for the auxiliary winding; the relevant parameters of the main - winding harmonic current are the frequency, amplitude, and phase of the harmonic current, and the relevant parameters of the main - auxiliary heterogeneous winding motor include the turns ratio between the main winding and the auxiliary winding;

[0045] It is deduced that when the current harmonics on the main winding and the auxiliary winding satisfy specific amplitude and phase relationships, the mutual cancellation of the corresponding harmonic electromagnetic forces can be achieved, and further the suppression of noise. The conclusion of this deduction is part of the present invention;

[0046] The reference value of the compensating current for the auxiliary winding is calculated by the following formula:

[0047]

[0048] In the formula, i vd1 and i vq1 are the currents of the main winding on the direct axis and the quadrature axis in the rotating coordinate system respectively, i vd2 and i vq2 are the currents of the auxiliary winding on the direct axis and the quadrature axis in the rotating coordinate system respectively, and N r is the turns ratio between the main winding and the auxiliary winding.

[0049] This calculation is completed in real - time by the control unit and serves as the basis for the next step.

[0050] S2. Inject a compensation current into the secondary winding according to the reference value of the compensation current for the secondary winding. This compensation current is a high-frequency harmonic current, and the harmonic electromagnetic force generated by the high-frequency harmonic current cancels the corresponding harmonic electromagnetic force of the primary winding to achieve electromagnetic noise suppression;

[0051] In this step, based on the broadband current spectrum regulation method, inject the compensation current into the secondary winding without distortion according to the reference value of the compensation current for the secondary winding;

[0052] Refer to Figure 3 , Figure 3 is the control block diagram of broadband current spectrum regulation. Among them, i d1_inj is the harmonic current to be injected, and i d1_comp , u d1_comp , u d2_comp are the injection amounts actually entering the control link. The broadband current spectrum regulation technology realizes the distortionless injection of current harmonics with a wide frequency range, especially harmonic frequencies higher than the bandwidth of the winding current loop, without affecting the system stability;

[0053] For the distortionless injection of the high-frequency harmonic current, the actual control method of the primary and secondary windings and the reference value of the compensation current should meet the following requirements:

[0054] The high-frequency harmonic current to be injected into the secondary winding is a sine wave with an amplitude of I inj and an angular frequency of ω inj . The primary and secondary windings use the current loop as the inner control loop, and the output of the current loop is the voltage reference quantity in the rotating coordinate system; the voltage superimposed on the voltage input of the SVPWM modulation module on the d-axis or q-axis of the primary and secondary windings should meet the following relationship:

[0055]

[0056] In the formula, u 1_comp is the superimposed voltage on the d-axis or q-axis of the primary winding in the rotating coordinate system, u 2_comp is the superimposed voltage on the d-axis or q-axis of the secondary winding in the rotating coordinate system, ω c1 is the cut-off frequency of the current loop of the primary winding, ω c2 is the cut-off frequency of the current loop of the secondary winding, M is the mutual inductance between the primary and secondary windings on the d-axis or q-axis in the rotating coordinate system, L2 is the inductance of the secondary winding on the d-axis or q-axis in the rotating coordinate system, and t is time.

[0057] Since the essence of the injection source is the discretization approximation of the sine wave by the controller, its sinusoidality is limited by the control frequency. To ensure a high sinusoidality of the injection source, the highest frequency of the injection source should not exceed one-fifth of the control frequency.

[0058] The high-frequency harmonic current injected into the winding cancels out the corresponding harmonic electromagnetic forces, achieving the suppression of electromagnetic noise; when the harmonic currents of the main and secondary windings satisfy the relationship in Equation (1), the corresponding harmonic electromagnetic forces cancel each other out, achieving the suppression of electromagnetic noise.

[0059] Steps for electromagnetic noise regulation:

[0060] T1. Calculate the harmonic current parameters to be injected into the main winding according to the electromagnetic noise spectrum to be regulated; the electromagnetic noise frequency is the same as the harmonic frequency of the current to be injected.

[0061] T2. Inject high-frequency harmonic current corresponding to the harmonic current parameters into the main winding to generate electromagnetic noise of the corresponding frequency, achieving the spectrum regulation of electromagnetic noise.

[0062] The high-frequency harmonic current to be injected into the main winding is a sine wave with an amplitude I inj , angular frequency ω inj ; the main winding and the secondary winding use a current loop as the inner control loop, and the output of the current loop is the voltage reference quantity in the rotating coordinate system; the voltage superimposed on the voltage input of the SVPWM modulation module on the d-axis or q-axis of the main winding and the secondary winding should satisfy the following relationship:

[0063]

[0064] In the formula, u 1_comp is the superimposed voltage on the d-axis or q-axis of the main winding in the rotating coordinate system, u 2_comp is the superimposed voltage on the d-axis or q-axis of the secondary winding in the rotating coordinate system, ω c1 is the cut-off frequency of the current loop of the main winding, ω c2 is the cut-off frequency of the current loop of the secondary winding, M is the mutual inductance between the main winding and the secondary winding on the d-axis or q-axis in the rotating coordinate system, L1 is the inductance of the main winding on the d-axis or q-axis in the rotating coordinate system, and t is time.

[0065] Since the essence of the injection source is the discretization approximation of the sine wave by the controller, its sinusoidality is limited by the control frequency. To ensure a high sinusoidality of the injection source, the highest frequency of the injection source should not exceed one-fifth of the control frequency.

[0066] Thus, the motor generates electromagnetic noise of a specified frequency, achieving the purpose of electromagnetic noise spectrum regulation.

[0067] The parameters of the prototype in this embodiment are as follows: the bus voltage of the main and secondary windings is 100V, the switching frequency is 50kHz, the motor is no-load, the cut-off frequencies of the current loops on the d-axis and q-axis of the main and secondary windings are set at 500Hz and 1kHz, and the electrical parameters of the main and secondary heterogeneous winding motors are that the dq-axis inductance of the main winding L d1 = 2.92mH, L q1 = 6.09mH, the dq-axis inductance of the secondary winding Ld2 = 0.74 mH, L q2 = 1.30 mH, mutual inductance M d = 0.45 mH, M q = 2.04 mH;

[0068] The measurement results of the motor vibration under normal operating conditions of the prototype are as Figure 4 shown. When no current harmonics are injected, in addition to the vibrations at the fundamental wave and its harmonic frequencies, there is an additional vibration of 1.2 kHz in the motor itself, and this frequency is the natural frequency of the motor structure;

[0069] Electromagnetic noise spectrum regulation: Inject a sine wave with a frequency of 6 kHz and an amplitude of 0.2 A on the q-axis of the main winding. The voltage of the actual injection control link conforms to Equation (3). The electromagnetic noise spectrum is as Figure 5 shown, generating electromagnetic noise with the same frequency as the injected frequency;

[0070] Electromagnetic noise suppression: As Figure 6 shown, current harmonics with a frequency of 3 kHz and an amplitude of 0.2 A are detected on the q-axis of the main winding, corresponding to electromagnetic noise at 3 kHz; As Figure 7 shown, inject current harmonics with specific frequencies into the secondary winding. The voltage of the actual injection control link conforms to Equation (2), and the corresponding electromagnetic vibrations are effectively suppressed. After experiments, the suppression amplitude in the frequency band from 500 Hz to 6 kHz is not less than 15 dB.

[0071] In summary, the present invention provides a broadband electromagnetic noise suppression and regulation method for a motor. Based on the main - secondary heterogeneous winding motor structure and the broadband current spectrum regulation method, it includes establishing the relationship between the electromagnetic noise frequency and the current harmonic frequency, establishing the relationship of the electromagnetic force harmonic cancellation condition based on the parameters of the main - secondary heterogeneous winding motor, calculating the parameters of the current harmonics to be injected according to the electromagnetic noise spectrum to be regulated; based on the broadband current spectrum regulation method, injecting compensation current into the main winding or the secondary winding without distortion; the high - frequency harmonic current injected into the secondary winding realizes the mutual cancellation of the corresponding harmonic electromagnetic forces, achieving the suppression of electromagnetic noise; the high - frequency harmonic current injected into the main winding realizes the regulation of the corresponding electromagnetic noise. The present invention realizes the suppression and regulation of the motor electromagnetic noise, and has a good effect on electromagnetic noise suppression.

[0072] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A broadband electromagnetic noise suppression and regulation method for an electric machine, which is applied to a master-slave heterogeneous winding electric machine, and is characterized in that: Including: Electromagnetic noise suppression steps: S1. Monitor the current harmonics of the main winding in real time. According to the parameters of the main winding current harmonics and in combination with the parameters of the master-slave heterogeneous winding motor, calculate and generate the reference value of the compensation current for the slave winding; S2. Based on the broadband current spectrum regulation method, inject the compensation current into the slave winding according to the reference value of the compensation current for the slave winding. This compensation current is a high-frequency harmonic current. The harmonic electromagnetic force generated by the high-frequency harmonic current cancels the corresponding harmonic electromagnetic force of the main winding to achieve electromagnetic noise suppression; Electromagnetic noise regulation steps: T1. According to the electromagnetic noise spectrum to be regulated, calculate the parameters of the harmonic current to be injected into the main winding; T2. Inject the high-frequency harmonic current corresponding to the harmonic current parameters into the main winding to generate electromagnetic noise with the corresponding frequency to achieve the spectrum regulation of electromagnetic noise.

2. The broadband electromagnetic noise suppression and regulation method for the motor according to claim 1, wherein: The master-slave heterogeneous winding motor is a dual-winding permanent magnet synchronous motor. The master-slave heterogeneous winding motor includes a main winding and a slave winding that are asymmetric and whose centers are not connected; the main winding operates in a low-frequency state and bears the main power, and the slave winding operates in a high-frequency state to compensate for the performance of the main winding.

3. The wideband electromagnetic noise suppression and regulation method for the motor according to claim 1, characterized in that: The electromagnetic noise is caused by the electromagnetic force harmonics inside the motor. Among them, the electromagnetic force includes the electromagnetic force generated by the interaction between the fundamental magnetomotive force of the permanent magnet and the harmonics of the master and slave windings, and the electromagnetic force generated by the interaction between the fundamental magnetomotive force of the stator and the harmonics of the master and slave windings; the corresponding relationship between the electromagnetic noise and the frequency of the main winding current harmonics is: the frequency of the current harmonics in the rotating coordinate system is consistent with the frequency of the actual electromagnetic noise.

4. The broadband electromagnetic noise suppression and regulation method for the motor according to claim 1, wherein: In step S1, the parameters of the main winding current harmonics are frequency, amplitude and phase, and the parameter of the master-slave heterogeneous winding motor is the turn ratio of the main winding to the slave winding.

5. The broadband electromagnetic noise suppression and regulation method for the motor according to claim 1, characterized in that: In step S1, the reference value of the compensation current for the slave winding is calculated by the following formula: where, i vd1 and i vq1 are respectively the currents of the main winding on the direct axis and the quadrature axis in the rotating coordinate system, i vd2 and i vq2 are respectively the currents of the slave winding on the direct axis and the quadrature axis in the rotating coordinate system, N r is the turns ratio of the main winding to the slave winding.

6. The broadband electromagnetic noise suppression and regulation method for the motor according to claim 1, characterized in that: In steps S2 and T1, the broadband current spectrum regulation method is used to inject the broadband high-frequency harmonic current into the windings of the master-slave heterogeneous winding motor without distortion.

7. The broadband electromagnetic noise suppression and regulation method for the motor according to claim 6, characterized in that: For the distortion-free injection of the high-frequency harmonic current, the actual control method of the master and slave windings and the reference value of the compensation current meet the following requirements: The high-frequency harmonic current to be injected into the winding has an amplitude of I inj , an angular frequency of ω inj and is a sine wave; the main winding and the secondary winding use a current loop as the inner control loop, and the output of the current loop is the voltage reference quantity in the rotating coordinate system; the voltage superimposed on the voltage input of the SVPWM modulation module on the d-axis or q-axis of the main winding and the secondary winding should satisfy the following relationship: The high-frequency harmonic current to be injected into the main winding is a sine wave with an amplitude of I inj , and an angular frequency of ω inj ; the main winding and the secondary winding use a current loop as the inner control loop, and the output of the current loop is the voltage reference quantity in the rotating coordinate system; the voltage superimposed on the voltage input of the SVPWM modulation module on the d-axis or q-axis of the main winding and the secondary winding should satisfy the following relationship: where, u 1_comp is the superimposed voltage of the main winding on the d-axis or q-axis in the rotating coordinate system, u 2_comp is the superimposed voltage of the secondary winding on the d-axis or q-axis in the rotating coordinate system, ω c1 is the cut-off frequency of the main winding current loop, ω c2 is the cut-off frequency of the secondary winding current loop, M is the mutual inductance of the main winding and the secondary winding on the d-axis or q-axis in the rotating coordinate system, L1 is the inductance of the main winding on the d-axis or q-axis in the rotating coordinate system, L2 is the inductance of the secondary winding on the d-axis or q-axis in the rotating coordinate system, and t is time.

8. The broadband electromagnetic noise suppression and regulation method for the motor according to claim 1, characterized in that: The regulation frequency of the electromagnetic noise is consistent with the frequency of the high-frequency harmonic current injected into the main winding.

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