CN115955158B - Active noise reduction method for inverter dead zone regulation type three-phase synchronous motor - Google Patents
Active noise reduction method for inverter dead zone regulation type three-phase synchronous motor Download PDFInfo
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Abstract
The invention discloses an inverter dead zone regulation type active noise reduction method for a three-phase synchronous motor, which comprises the steps of installing a microphone array around the three-phase motor, collecting noise emitted by the motor during operation and inputting the noise into a control system; the control system generates the dead zone width of the left side and the right side of the three-phase inverter through the harmonic signal processing module and the dead zone width generating module; and then, combining a voltage reference generated by a conventional control strategy of the motor, and generating a dead-zone regulation pulse width modulation wave through a modulation module. The dead zone regulation pulse width modulation wave is input into an inverter to control harmonic current distribution and fundamental current of a motor, so that feedback noise elimination of motor harmonic noise is realized in a dead zone regulation mode while motor output is met. According to the invention, the installation of the inverted signal output device such as a loudspeaker is not needed, so that the influence of the installation position of the inverted signal output device on the noise suppression effect in the traditional active noise reduction device is avoided, and the total volume and cost of the active noise reduction device are reduced.
Description
Technical Field
The invention relates to the field of active noise reduction of motors, in particular to a method for actively reducing noise of a motor by collecting motor noise in real time, feeding the motor noise into an inverter (namely a motor driver) and correspondingly adjusting a dead zone of a switching signal of the inverter.
Background
The motor active noise reduction technology is widely applied, such as air conditioners, wind driven generators, electric automobiles and the like. The motor active noise reduction device is generally composed of a motor and a driving control system thereof, a noise acquisition device and an inverse signal output device. The noise acquisition device acquires a noise signal sent by the motor and inputs the noise signal into the control system, the control system filters out frequency components which can not be heard by human ears, then generates a control signal and sends the control signal to the inversion signal output device, and the inversion signal output device outputs a signal which has the same frequency as the noise but opposite phase to the noise source so as to offset the noise sent by the motor, thereby achieving the purpose of actively reducing noise.
Disclosure of Invention
Technical problems: the invention aims to provide an inverter dead zone regulation type three-phase synchronous motor active noise reduction method, wherein an active motor noise reduction system with an inverted signal output device is used for outputting an inverted signal by using a loudspeaker and other devices, so that a certain physical space is occupied, and the final noise reduction effect depends on the installation position of the inverted signal output device such as the loudspeaker and the like.
The technical scheme is as follows: in order to achieve the above purpose, the active noise reduction method for the inverter dead zone regulation type three-phase synchronous motor adopts the following technical scheme:
according to the method, a microphone array is arranged around a three-phase synchronous motor, noise sound pressure emitted by the motor during operation is collected in real time, and then the sound pressure is fed into a control system of the three-phase synchronous motor; in a control system, all of the microphone arraysmNoise sound pressure collected by each microphonep 1 ，p 2 ，… p m Is input to a harmonic signal processing module,mis a positive integer; the sound pressure harmonic signal is obtained through processing of the harmonic signal processing module, then the sound pressure harmonic signal is input into the dead zone width generating module, and the dead zone width of each phase left and right sides of the three-phase pulse width modulation wave is actively adjusted in real time according to the noise conditiont dxl 、t dxr ，x =a，b，cRespectively representa，b，cA phase; will be described above with noise feedback control featurest dxl 、t dxr Input to a voltage space vector modulation module and combined with an alpha-axis voltage reference in an alpha-beta coordinate system generated by a conventional control strategy module for controlling fundamental wavesU* α And beta axis voltage referenceU* β Generating a dead zone regulation pulse width modulation wave; the dead zone regulation pulse width modulation wave is input into an inverter to control harmonic current distribution and fundamental current of a motor, so that feedback noise elimination of motor harmonic noise is realized in a dead zone regulation mode while motor output is met.
In the harmonic signal processing module, each noise sound pressurep 1 ，p 2 ，… p m Firstly, the noise is input into a harmonic extraction module, and the front corresponding to each noise is obtained by extracting the noise from low to high according to the frequencyr6 pieces ofkThe amplitude and phase of the subacoustic pressure harmonics,r、kare all positive integers; then extracting the obtainedrThe sound pressure harmonic signals are input into a phase compensation module to carry out phase compensation; then inputting all compensated sound pressure harmonic signals into a harmonic signal synthesis module, wherein the harmonic signal synthesis module synthesizes noise sound pressure harmonic amplitude sets and phase sets corresponding to a plurality of microphones into a harmonic vector set V h The method comprises the steps of carrying out a first treatment on the surface of the Finally, the harmonic vector set V h And inputting the sound pressure harmonic wave vector into a harmonic wave screening module for screening.
In the phase compensation module, each microphoneiDistance to motor surfacel 1 ，…l i ，… l m According to the measurement or design diagram, is stored in advance in the phase compensation module, from which the value of the advance phase compensation required by each microphone is calculated,i=1,2…m。
the value of the required advance phase compensation for each microphone, for microphonesi The frequency of the collected noise is 6kSub-sound pressure harmonic signal with phase θ of phase compensation corresponding thereto ki6 The method comprises the following steps:
wherein, the liquid crystal display device comprises a liquid crystal display device, v s as the speed of sound in the current ambient medium,mthe number of the microphones is the number of the microphones,rfor 6 selectedkNumber of subharmonics.
The harmonic signal synthesis module synthesizes the same-frequency sound pressure harmonic waves acquired by the different compensated microphones to obtain a harmonic vector set V h The method comprises the steps of carrying out a first treatment on the surface of the The module is matched with microphone when combinediAcquisition 6kSubacoustic pressure harmonic amplitude multiplied by weightw ki6 Then, according to the vector parallelogram synthesis rule, a 6 is obtained by synthesis at a harmonic frequencykSubacoustic pressure harmonic vector; synthesizing all selected harmonic frequencies to obtain a harmonic vector set V h This set contains the magnitude information and phase information of the resulting sound pressure harmonic vector.
The harmonic signal synthesis module is used for a microphoneiAcquisition 6kWeighting of infrasound pressure harmonic amplitudew ki6 The constraint is satisfied:
，
wherein, the liquid crystal display device comprises a liquid crystal display device,w ki6 and (3) the constant value is preset, or the real-time adjustment is carried out according to the working condition.
The harmonic screening module is used for screening the harmonic vector set V according to the screening rule that the amplitude of the harmonic is from large to small h Middle screeningqThe amplitude and phase output of each sound pressure harmonic vector is used for calculating the on time variation of an upper switching tube of each phase and recording the screened frequency as 6k 1 , 6k 2 ,..., 6k q ；q ≤ rAnd is a positive integer.
The dead zone width generation module firstly screens out 6k j The subacoustic pressure harmonic amplitude is multiplied by a conversion scaling factor G j Then multiplying by two weight coefficientsw dj 、1-w dj Yield 6k j -1 time and 6k j Amplitude reference of +1st order voltage harmonic, 0< w dj <1，j =1,2,…,qThe method comprises the steps of carrying out a first treatment on the surface of the Then 6 is added withk j After the phase angles of the subacoustic pressure harmonic waves are reversed, 6 is added respectivelyk j -1 st order voltage harmonic phase compensation value θ cj1 And 6k j +1 order voltage harmonic phase compensation value θ cj2 After which 6 is obtainedk j -1 time and 6k j Phase reference of +1st order voltage harmonic, after which 6k j -1 time and 6k j The harmonic voltage reference vector formed by the phase reference and the amplitude reference of +1 order voltage harmonic is input into the harmonic voltage space vector modulation module to calculate 6k j The change of the on time of the upper switching tube of each phase corresponding to the + -1-order voltage harmonic wave is added to the three-phase current at the momenti abc Conversion of input dead zone width conversion Module to 6k j The width of dead zones on the left and right sides of each phase, which are required to be regulated, corresponding to the infrasound pressure harmonic wave; then the dead zone width of each phase which is required to be regulated and corresponds to all sound pressure harmonic waves is input into a summation module to obtain the dead zone width of each phase before and after limitingt' dxl ，t' dxr After that fort' dxl ，t' dxr Limiting amplitude, and finally outputting to obtain dead zone width of left and right sides of each phaset dxl ，t dxr 。
The dead zone width conversion module performs dead zone width conversion according to the direction of each phase of current, and specifically comprises the following steps:
wherein delta isT xj Is 6k j Corresponding to + -1 order voltage harmonicsxThe amount of on-time variation of the upper switching tube of the phase,w x is thatxThe width distribution coefficient of dead zone at the left side and the right side of the phase is 0-0%w x ≤1，t dxjl ，t dxjr Respectively 6k j The harmonic wave of the subsonic pressure is correspondingly required to be regulatedxThe left dead zone width and the right dead zone width,t dxjl ，t dxjr subscript of (2)dRepresenting this time as dead zone adjustment time.
The summing module sums the obtained 6k j The dead zone width of each phase which needs to be regulated and corresponds to the infrasound pressure harmonic wave is summed according to the phase, and the initial dead zone width is added, and the on-off time of a switching tube is compensated:
wherein, the liquid crystal display device comprises a liquid crystal display device,t' dxl ，t' dxr respectively isxThe width of dead zone on the left and right sides before phase clipping,t dxl0 ，t dxr0 respectively isxThe left and right dead zone width initial values of the phases,t son ，t soff the on time and the off time of the switching tube respectively.
The beneficial effects are that: compared with the traditional motor active noise reduction device, the inverter dead zone regulation type three-phase synchronous motor active noise reduction method disclosed by the invention does not need to additionally install the inverted signal output device such as a loudspeaker, thereby avoiding the influence of the installation position of the inverted signal output device on the noise suppression effect and reducing the total volume and the system cost of the active noise reduction device.
Drawings
Figure 1 is a schematic diagram of a hardware embodiment of the invention comprising a motor and a microphone array,
figure 2 is a block diagram of the overall control scheme of the present invention,
figure 3 is a detailed control block diagram of the interior of the harmonic signal processing module of the present invention,
figure 4 is an internal detailed control block diagram of the dead zone width generation module of the present invention,
fig. 5 is a schematic diagram of dead-zone width adjustment of a three-phase drive waveform of a motor drive inverter of the present invention.
The drawings are as follows: three-phase synchronous motor 100, microphone array 200.
A control system 300, a harmonic signal processing module 310, a dead zone width generation module 320, a conventional control strategy module 330, and a voltage space vector modulation module 340.
The device comprises a harmonic extraction module 311, a phase compensation module 312, a harmonic signal synthesis module 313 and a harmonic screening module 314.
A harmonic voltage space vector modulation module 321, a dead-zone width conversion module 322, and a summation module 323.
Detailed Description
According to the inverter dead zone regulation type three-phase synchronous motor active noise reduction method, a microphone array 200 is arranged around a three-phase synchronous motor 100, noise sound pressure emitted by the motor during operation is collected in real time, and then the sound pressure is fed into a control system 300 of the three-phase synchronous motor; in the control systemIn system 300, all of microphone array 200mNoise sound pressure collected by each microphonep 1 ，p 2 ，… p m Is input to the harmonic signal processing module 310,mis a positive integer; the sound pressure harmonic signal is obtained through processing by the harmonic signal processing module 310, and then is input into the dead zone width generating module 320, and the dead zone width of each phase left and right sides of the three-phase pulse width modulation wave is actively adjusted in real time according to the noise conditiont dxl 、t dxr ，x =a，b，cRespectively representa，b，cA phase; will be described above with noise feedback control featurest dxl 、t dxr Is input to the voltage space vector modulation module 340 and incorporates an alpha-axis voltage reference in the alpha-beta coordinate system generated by the conventional control strategy module 330 for controlling the fundamental waveU* α And beta axis voltage referenceU* β Generating a dead zone regulation pulse width modulation wave; the dead zone regulation pulse width modulation wave is input into the inverter 400 to control the harmonic current distribution and the fundamental current of the motor, so that the feedback noise elimination of the motor harmonic noise is realized in a dead zone regulation mode while the motor output is met.
In the harmonic signal processing module 310, each noise sound pressurep 1 ，p 2 ，… p m Is firstly input into a harmonic extraction module 311 to extract the front corresponding to each noise from low to high according to the frequencyr6 pieces ofkThe amplitude and phase of the subacoustic pressure harmonics,r、kare all positive integers; then extracting the obtainedrThe sound pressure harmonic signals are input to the phase compensation module 312 for phase compensation; then all the compensated sound pressure harmonic signals are input into a harmonic signal synthesis module 313, and the harmonic signal synthesis module 313 synthesizes the noise sound pressure harmonic amplitude set and the phase set corresponding to the microphones into a harmonic vector set V h The method comprises the steps of carrying out a first treatment on the surface of the Finally, the harmonic vector set V h The harmonic screening module 314 is input to screen to obtain sound pressure harmonic vectors.
Each of the wheat in the phase compensation module 312Distance of wind from motor surfacel 1 ，l 2 ，… l m According to the measurements or designs, stored in advance in the phase compensation module 312, from which the values of the advance phase compensation required for each microphone are calculated.
The specific embodiment is as follows:
a microphone array is arranged at a fixable position close to a motor, for example, an analog MEMS microphone is arranged at the front side, the back side, the left side, the right side and the top, five microphones are arranged at the top respectively, the acquired noise information is amplified to the order of 0-3.3V through a signal conditioning circuit and is input into an ADC sampling port of a motor control system, and a 32-bit control chip, such as STM32G474, is selected as a control chip in consideration of calculation force required by the control scheme.
The harmonic signal processing module inputs each noise sound pressure to the harmonic extraction module firstly, and uses higher orderdqThe cascade filter is converted, and the front corresponding to each noise is extracted from low frequency to high frequencyr6 pieces ofkAmplitude and phase of infrasound pressure harmonics, in this embodimentrSetting to 5, i.e. extracting the amplitude and phase of 6, 12, 18, 24 and 30 th order sound pressure harmonics of the respective noise; these signals are then input to a phase compensation module for phase compensation.
Measuring distances of individual microphones in a microphone array from a motor surfacel 1 ，l 2 ，… l 5 And store it in advance in a phase compensation module, from which the value of the phase compensation required by each microphone is calculated, for a frequency of 6kSubacoustic pressure harmonic signal, microphonei Phase θ of phase compensation corresponding to the collected noise ki6 The method comprises the following steps:
wherein, the liquid crystal display device comprises a liquid crystal display device,v s take 314 m/s. Traversing microphoneiMicrophone is providediAcquisition of noise 6kPhase of infrasound pressure harmonic signal minus θ ki6 And obtaining the compensated phase.
Microphone after harmonic signal synthesis module pair compensationiThe collected same-frequency sound pressure harmonic waves are synthesized, and the amplitude values of the same-frequency sound pressure harmonic waves are multiplied by weightsw ki6 In this embodiment the weights are set to equal weights, i.e. for allkWill bew ki 6 All are set to be 0.2, and then a sound pressure harmonic vector is obtained comprehensively under a harmonic frequency according to a vector parallelogram synthesis rule; synthesizing all selected harmonic frequencies to obtain a harmonic vector set V h The set contains the amplitude information and the phase information of the synthesized sound pressure harmonic vector.
The harmonic wave screening module selects the harmonic wave vector set V according to the screening rule of the amplitude of the harmonic wave from large to small h The harmonic amplitude with the largest amplitude is screened outqAmplitude and phase outputs of the sound pressure harmonic vectors, and the frequency selected is recorded as 6k 1 , 6k 2 ,..., 6k q In one embodimentqSet to 3.
The dead zone width generation module will first be 6k j The subharmonic amplitude is multiplied by a conversion scaling factor G to be set j Then multiplying by two weight coefficientsw dj 、1-w dj Yield 6k j -1 st harmonic sum 6k j Amplitude reference of +1 order harmonic, in one embodimentw dj Are all set to 0.5, then 6k j The subharmonic phase angles are reversed and added with 6 to be set respectivelyk j -1 st order voltage harmonic phase compensation value θ cj1 And 6k j +1 order voltage harmonic phase compensation value θ cj2 And then used as a phase reference for the phase,j=1, 2,3; thereafter, 6 will bek j -1 time and 6k j The harmonic voltage reference vector formed by the phase reference and the amplitude reference of +1 order voltage harmonic is input into the harmonic voltage space vector modulation module to calculate 6k j The change of the on time of the upper switching tube of each phase corresponding to the + -1-order voltage harmonic wave is changedThe amount of conversion and the current of three phases at the timei abc Conversion of input dead zone width conversion Module to 6k j The width of dead zones on the left and right sides of each phase, which are required to be regulated, corresponding to the infrasound pressure harmonic wave; then the dead zone width of each phase which is required to be regulated and corresponds to all sound pressure harmonic waves is input into a summation module to obtain the dead zone width of each phase before and after limitingt' dxl ，t' dxr After that fort' dxl ，t' dxr Limiting amplitude, and finally outputting to obtain dead zone width of left and right sides of each phaset dxl ，t dxr 。
The dead zone width conversion module performs dead zone width conversion according to the direction of each phase of current, and the specific rule is as follows:
，
wherein delta isT xi Is 6k j Corresponding to + -1 order voltage harmonicsxThe amount of on-time variation of the upper switching tube of the phase,w x is thatxThe dead zone width distribution coefficient on the left and right sides of the phase, set to 0.5 in one embodiment,t dxjl ，t dxjr respectively 6k j The harmonic wave of the subsonic pressure is correspondingly required to be regulatedxDead zone width on the left and right sides of the phase.
The summing module sums all the dead zone widths and superimposes the initial dead zone width and the on-off time of the switching tube:
wherein, the liquid crystal display device comprises a liquid crystal display device,t' dxl ，t' dxr respectively isxThe width of dead zone on the left and right sides before phase clipping,t dxl0 ，t dxr0 respectively isxThe left and right dead zone width initial values of the phase, set to 3 mus in one embodiment,t son ，t soff guides for switching tubesAnd (5) checking the on time and the off time to obtain a switching tube data manual.
And finally, inputting the dead zone width into a modulation module, and modulating and outputting dead zone regulation pulse width modulation waves by combining with a conventional control strategy of the motor.
Claims (10)
1. An inverter dead zone regulation type three-phase synchronous motor active noise reduction method is characterized by comprising the following steps of: according to the method, a microphone array (200) is arranged around a three-phase synchronous motor (100), noise sound pressure emitted by the motor during operation is collected in real time, and then the sound pressure is fed into a control system (300) of the three-phase synchronous motor; in the control system (300), noise sound pressure p collected by all m microphones in the microphone array (200) 1 ，p 2 ，…p m Is input into a harmonic signal processing module (310), m being a positive integer; the sound pressure harmonic signal is obtained through the processing of the harmonic signal processing module (310), and then the sound pressure harmonic signal is input into the dead zone width generating module (320), and the dead zone width t of each phase left and right sides of the three-phase pulse width modulation wave is actively adjusted in real time according to the noise condition dxl 、t dxr X=a, b, c, respectively representing a, b, c phases; t with noise feedback control feature dxl 、t dxr Is input to a voltage space vector modulation module (340) and combined with an alpha-axis voltage reference in an alpha-beta coordinate system generated by a conventional control strategy module (330) for controlling fundamental waves
And beta-axis voltage reference->
Generating a dead zone regulation pulse width modulation wave; the dead zone regulation pulse width modulation wave is input into an inverter (400) to control harmonic current distribution and fundamental current of the motor, so that feedback noise elimination of motor harmonic noise is realized in a dead zone regulation mode while motor output is met.
2. The inverter dead zone regulated three-phase synchronous motor initiative of claim 1The noise reduction method is characterized in that: in the harmonic signal processing module (310), each noise sound pressure p 1 ，p 2 ，…p m Firstly, inputting the harmonic wave into a harmonic wave extraction module (311), and extracting the first r 6k harmonic wave amplitudes and phases corresponding to each noise according to the frequency from low to high, wherein r and k are positive integers; then inputting the r extracted sound pressure harmonic signals into a phase compensation module (312) for phase compensation; then inputting all compensated sound pressure harmonic signals into a harmonic signal synthesis module (313), wherein the harmonic signal synthesis module (313) synthesizes noise sound pressure harmonic amplitude sets and phase sets corresponding to a plurality of microphones into a harmonic vector set V h The method comprises the steps of carrying out a first treatment on the surface of the Finally, the harmonic vector set V h And inputting a harmonic screening module (314) to screen and obtain a sound pressure harmonic vector.
3. The inverter dead zone regulation type three-phase synchronous motor active noise reduction method according to claim 2, wherein the method comprises the following steps: in the phase compensation module (312), the distance l from each microphone i to the motor surface 1 ，…l i ，…l m According to the measurement or design diagram, stored in advance in a phase compensation module (312), from which the values of the advance phase compensation required for the respective microphones are calculated, i=1, 2 … m.
4. The inverter dead zone regulation type three-phase synchronous motor active noise reduction method according to claim 3, wherein the method comprises the following steps: the value of the advance phase compensation required by each microphone corresponds to the phase theta of the phase compensation of the sound pressure harmonic signal with the frequency of 6k times in the noise collected by the microphone i 6ki The method comprises the following steps:
wherein v is s For the sound velocity in the current environment medium, m is the number of microphones, and r is the number of 6k selected harmonics.
5. According toThe inverter dead zone regulation type three-phase synchronous motor active noise reduction method as claimed in claim 2, wherein the method comprises the following steps: the harmonic signal synthesis module (313) synthesizes the same-frequency sound pressure harmonic waves acquired by the different compensated microphones to obtain a harmonic vector set V h The method comprises the steps of carrying out a first treatment on the surface of the When being combined, the module multiplies the amplitude of 6k sound pressure harmonic waves acquired by the microphone i by the weight w 6ki Then, according to a vector parallelogram synthesis rule, synthesizing to obtain a 6k subsound pressure harmonic vector under a harmonic frequency; synthesizing all selected harmonic frequencies to obtain a harmonic vector set V h This set contains the magnitude information and phase information of the resulting sound pressure harmonic vector.
6. The inverter dead zone regulation type three-phase synchronous motor active noise reduction method according to claim 2 or 5, characterized in that: the harmonic signal synthesis module (313) is used for weighting w of the amplitude of the 6 k-th sound pressure harmonic acquired by the microphone i 6ki The constraint is satisfied:
wherein w is 6ki And (3) the constant value is preset, or the real-time adjustment is carried out according to the working condition.
7. The inverter dead zone regulation type three-phase synchronous motor active noise reduction method according to claim 2, wherein the method comprises the following steps: the harmonic screening module (314) is used for screening the harmonic vector set V according to the screening rule from large to small in harmonic amplitude h The amplitude and phase output of q sound pressure harmonic vectors are screened out to calculate the on time variation of the upper switch tube of each phase, and the screened frequency is recorded as 6k 1 ,6k 2 ,...,6k q The method comprises the steps of carrying out a first treatment on the surface of the q is less than or equal to r and is a positive integer.
8. The inverter dead zone regulation type three-phase synchronous motor active noise reduction method according to claim 1 or 7, characterized in that: the dead zone width generation module (320) first filters6k of out j The subacoustic pressure harmonic amplitude is multiplied by a conversion scaling factor G j Then multiplied by two weight coefficients w dj 、1-w dj Obtain 6k j -1 st and 6k j Amplitude reference of +1st order voltage harmonic, 0<w dj <1, j=1, 2, …, q; then 6k is taken j After the phase angle of the subacoustic pressure harmonic wave is reversed, 6k is added respectively j -1 st order voltage harmonic phase compensation value θ cj1 And 6k j +1 order voltage harmonic phase compensation value θ cj2 After which 6k is obtained j -1 st and 6k j Phase reference of +1st order voltage harmonic, 6k will then be j -1 st and 6k j The harmonic voltage reference vector formed by the phase reference and the amplitude reference of the +1st voltage harmonic is input into a harmonic voltage space vector modulation module (321) to calculate 6k j The change of the on time of the upper switching tube of each phase corresponding to the + -1-order voltage harmonic wave is added with the three-phase current i at the moment abc An input dead zone width conversion module (322) converts to 6k j The width of dead zones on the left and right sides of each phase, which are required to be regulated, corresponding to the infrasound pressure harmonic wave; then the dead zone width of each phase which is required to be regulated and corresponds to all sound pressure harmonic waves is input into a summation module (323) to obtain the dead zone width t 'of each phase before and after limiting' dxl ，t' dxr After that for t' dxl ，t' dxr Limiting amplitude, and finally outputting to obtain dead zone width t of left and right sides of each phase dxl ，t dxr 。
9. The inverter dead zone regulation type three-phase synchronous motor active noise reduction method according to claim 8, wherein the method comprises the following steps: the dead zone width conversion module (322) performs dead zone width conversion according to the direction of each phase current, and specifically comprises the following steps:
wherein DeltaT xj Is 6k j The change quantity, w, of the conduction time of an upper switching tube of x phases corresponding to +/-1-order voltage harmonic x The coefficients are distributed for the width of dead zones on the left side and the right side of the x phase, and w is more than or equal to 0 x ≤1，t dxjl ，t dxjr Respectively 6k j The width of the left dead zone and the width of the right dead zone of the x-phase which are required to be adjusted and correspond to the infrasound pressure harmonic, t dxjl ，t dxjr The subscript d of (2) represents this time as dead band adjustment time.
10. The inverter dead zone regulation type three-phase synchronous motor active noise reduction method according to claim 8, wherein the method comprises the following steps: the summing module (323) sums the resulting 6k j The dead zone width of each phase which needs to be regulated and corresponds to the infrasound pressure harmonic wave is summed according to the phase, and the initial dead zone width is added, and the on-off time of a switching tube is compensated:
wherein t' dxl ，t' dxr The width of dead zones at the left side and the right side before x-phase amplitude limiting is respectively t dxl0 ，t dxr0 Left and right dead zone width initial values of x phase respectively, t son ，t soff The on time and the off time of the switching tube respectively.
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