CN117240145B - Noise reduction method of sensitive single-phase motor based on SHEPWM - Google Patents
Noise reduction method of sensitive single-phase motor based on SHEPWM Download PDFInfo
- Publication number
- CN117240145B CN117240145B CN202311528285.1A CN202311528285A CN117240145B CN 117240145 B CN117240145 B CN 117240145B CN 202311528285 A CN202311528285 A CN 202311528285A CN 117240145 B CN117240145 B CN 117240145B
- Authority
- CN
- China
- Prior art keywords
- angle
- switching
- angles
- square wave
- waveform
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 48
- 230000009467 reduction Effects 0.000 title claims abstract description 33
- 238000012360 testing method Methods 0.000 claims abstract description 16
- 238000012545 processing Methods 0.000 claims abstract description 12
- 230000000694 effects Effects 0.000 abstract description 2
- 230000008030 elimination Effects 0.000 abstract description 2
- 238000003379 elimination reaction Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 11
- 238000004364 calculation method Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 6
- 238000004804 winding Methods 0.000 description 6
- 238000004590 computer program Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000001360 synchronised effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Abstract
The invention provides a noise reduction method of a sensitive single-phase motor based on SHEPWM, which comprises the following steps: presetting the number of switching angles of each cycle of the square wave, capturing and processing Hall signals of the motor, and acquiring a count value of the switching angles, a count value of the Hall signals and a count value of phase voltage pulse width; setting the switching angle and the conduction time of the square wave by calculating the angle of the switching angle and the phase voltage pulse width of each period; generating SHEPWM pulses, performing noise test, obtaining the waveform of the square wave at the moment, and judging whether the noise requirement is met according to the times of harmonic components in the waveform; if the noise requirement is not met, the number of the switching angles, the angle values of the switching angles and the phase voltage pulse width are adjusted every cycle until the noise requirement is met. According to the invention, by optimizing the specific harmonic elimination pulse width modulation method, under the condition of greatly reducing the calculated amount, the undesirable low-order harmonic in the square wave is eliminated, and the output fundamental wave voltage is controlled, so that the efficient noise reduction effect of the motor is achieved.
Description
Technical Field
The invention relates to the technical field of motor noise reduction, in particular to a noise reduction method of a sensitive single-phase motor based on SHEPWM.
Background
The single-phase permanent magnet synchronous motor with the Hall sensor is generally powered by a 220V alternating current single-phase power supply to operate, so that the motor is commonly applied to the household appliance industry, such as an air conditioner external motor, an electric fan, a blowing motor, an exhaust fan, a washing machine, a refrigerator and the like. The operation principle of the square wave driven single-phase permanent magnet synchronous motor is basically the same as that of a common direct current motor, the square wave driven single-phase permanent magnet synchronous motor is sent to a microcontroller after the Hall sensor captures the rotor position, the controller generates corresponding switch states after performing logic analysis, then power devices in an inverter are triggered in a certain sequence, and power supply power is distributed to windings of a motor stator according to certain logic, so that the motor generates continuous torque.
Referring to fig. 1, a schematic diagram of a single-phase inverter is shown, upper and lower bridge arms of a power device of an a-phase inverter are V1 and V2, and upper and lower bridge arms of a power device of a B-phase inverter are V3 and V4. Because the input is single-phase alternating current power supply, each phase has two phase changes, two phases have four phase changes, and one trapezoidal wave occupies 90 degrees. When sine wave current is input into A+ and B-, the power device switch states in the inverter are V1 and V4 on, V2 and V3 off, and current flows into the A-phase winding from the V1 pipe and flows out of the B-phase winding, and returns to the power supply through the V4 pipe; when the Hall sensor captures a position signal, the controller performs phase inversion control according to the overturn of the position detection signal, namely, the sinusoidal wave current input is controlled to be converted into A-, B+, at the moment, the trigger combination state of the inverter power device is that V1 and V4 are turned off, V2 and V3 are turned on, current flows into a B-phase winding from a V3 pipe, flows out of the A-phase winding, returns to a power supply from the V2 pipe, and is controlled to be commutated again when the Hall sensor captures the position signal, and the inversion is controlled to be repeated to form square wave control. The square wave drive is adopted, the Hall sensor is used for obtaining the rotor position, and the scheme of forced phase change through the signal is simple in control method and low in cost. However, the square wave drive phase change will present current abrupt change, which results in larger torque ripple, and the square wave current has a large number of harmonic components, so the noise index is poor, and the square wave drive phase change device is difficult to be applied to household products in practice.
In addition, the SHEPWM is generally adopted to eliminate specific low-order harmonic waves by calculating the switching moment of PWM waves, however, because the established mathematical model is a group of nonlinear equation sets, the solution can only be carried out by adopting a numerical method, and the solution process is complex; the traditional Newton iteration method has the defects that the solution is strict in initial value due to the local convergence, the solution speed is low, and the convergence is poor. Based on the influence of the above factors, a great amount of calculation force and time are consumed for solving the switching angle, so that the solution is limited, and the application of the SHEPWM technology in practice is limited.
Therefore, it is desirable to design a method that can efficiently reduce noise generated by the motor when it is running.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a noise reduction method of a sensitive single-phase motor based on SHEPWM, which solves the defects that the existing single-phase motor adopts square wave driving phase inversion to cause poor noise index and the SHEPWM technology applied to motor noise reduction needs to consume a large amount of calculation power and time, and aims at the requirements of the application products of the motor on noise suppression, the invention eliminates undesirable low-order harmonic waves in square waves and controls the magnitude of output fundamental wave voltage under the condition of greatly reducing the calculation amount and time by optimizing a specific harmonic wave elimination pulse width modulation method, thereby achieving the effect of high-efficiency noise reduction of the motor.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a method of noise reduction for a shawm-based sensored single phase motor, comprising:
s1: based on the SHEPWM modulation mode, the relation between the number of the quarter-period symmetrical waveform switching angles, the angle value and the harmonic frequency is obtained, and accordingly the number of the switching angles of each period of the square wave is preset.
S2: and capturing and processing a Hall signal of the motor, and acquiring a count value of a switching angle, a count value of arrival of the Hall signal and a count value of phase voltage pulse width of the motor.
S3: the switching angle of the square wave and the conduction time thereof are set by calculating the angle of the switching angle per cycle and the phase voltage pulse width.
S4: generating SHEPWM pulse, performing noise test, obtaining the waveform of the square wave at the moment, and judging whether the noise requirement is met according to the times of harmonic components in the waveform.
S5: if the noise requirement is not met, the number of the switching angles, the angle values of the switching angles and the phase voltage pulse width are adjusted every cycle, and the step S2 is repeated, so that harmonic components are eliminated until the noise requirement is met.
According to the noise reduction method of the sensitive single-phase motor based on the SHEPWM, provided by the invention, the Fourier series expansion form of the bipolar SHEPWM output voltage waveform is expressed as follows:
(1)
based on the SHEPWM modulation mode, a waveform with quarter-period symmetry is adopted, and the waveform only contains sine terms and odd harmonic components, so that the waveform comprises the following components:
(3)
wherein n is the frequency of fundamental wave and each subharmonic,is cosine coefficient>Is sine coefficient +.>Angular frequency, t is time.
According to the noise reduction method of the sensitive single-phase motor based on SHEPWM provided by the invention, the waveform is assumed to have unit amplitude, namelyThen get +.>The method comprises the following steps:
(8)
wherein k represents a value of [0, pi/2 ]]The number of switching angles in the interval,the angle value of the ith switch angle of the k switch angles in the interval is represented.
According to the noise reduction method of the sensitive single-phase motor based on SHEPWM, in the step S1, square waves with the number of 4 switching angles are preset, and then the number of switching angles after each adjustment is twice the number of the current switching angles.
According to the noise reduction method of the sensitive single-phase motor based on SHEPWM, when square waves with the number of 4 switch angles are adopted, the processing mode of the Hall signal is as follows:
further comprising step S21: the first four period captured hall signals are respectively a first hall signal, a second hall signal, a third hall signal and a fourth hall signal, and then the second hall signal, the third hall signal, the fourth hall signal and the first hall signal are sequentially used for each period position signal from the current period position signal.
According to the noise reduction method of the sensitive single-phase motor based on the SHEPWM, which is provided by the invention, the noise reduction method further comprises the following step S22: when square waves with the number of the switch angles being more than or equal to 8 are adopted, the Hall signals are filtered by adopting a moving average, the Hall signals captured in each period are averaged, and the average value is used as the position signal of the period, so that random noise in the Hall signals is averaged.
According to the noise reduction method of the sensitive single-phase motor based on SHEPWM, when square waves with the number of 4 switching angles are adopted, the angle value of each switching angle is as follows:
wherein c is the count value of the arrival of the Hall signal, and d is the count value of the switching angle.
According to the noise reduction method of the sensitive single-phase motor based on SHEPWM, when square waves with the number of 4 switch angles are adopted, the phase voltage pulse width is as follows:
where e is the count value of the phase voltage pulse width.
According to the noise reduction method of the sensitive single-phase motor based on SHEPWM, in the step S5, if the number of the switch angles, the angle values of the switch angles and the phase voltage pulse width are adjusted, the harmonic component is increased during noise test, and the angle values and the number of the switch angles are reversely adjusted on the basis of the last numerical value.
According to the noise reduction method of the sensitive single-phase motor based on the SHEPWM, the high-frequency rotating speed of the single-phase motor is fixed to 18000+/-500 rpm, when 4-switch-angle square waves are adopted, the conduction time of the square waves is 412 mu s, and at the moment, the conduction time of the switch angle is 44 mu s; when the 8-switch-angle square wave is adopted, the conduction time of the square wave is 361 mu s, and at the moment, the conduction time of the switch angle is 26 mu s.
Therefore, compared with the prior art, the invention has the following beneficial effects:
1. according to the scheme, a preset number of switch angles are formed in the square wave based on a SHEPWM modulation mode, hall signals of the motor in each period are captured through the Hall sensor, the count value of the switch angles, the count value of the arrival of the Hall signals and the count value of the phase voltage pulse width of the motor are obtained through the counter, so that the angle of the switch angles and the phase voltage pulse width in each period are calculated according to an empirical formula, after noise testing, the number of harmonic frequencies in the square wave waveform at the moment are analyzed, the number of the switch angles, the angle and the phase voltage pulse width are adjusted according to the change of the harmonic frequencies of the waveform obtained by the next noise testing, the process is repeated until harmonic components are eliminated or the phase voltage pulse width is reduced to a large extent, and therefore the requirement of the product on noise is met.
2. The invention determines the angle, the number and the phase voltage pulse width of the switching angle in each period through simple calculation and noise test waveforms, adopts traditional square wave drive, utilizes the Hall sensor to obtain the rotor position, can take into account the advantages of simple control scheme and low cost of forced commutation of the Hall signal, and simultaneously gradually filters a large number of harmonic components in the square wave current until reaching the noise index, thereby providing a breakthrough scheme for noise reduction of the motor, and enabling the square wave drive scheme to be applied to a plurality of household products and having wide application prospect and market value.
3. The motor noise reduction method provided by the invention has strong flexibility, the angle, the number and the phase voltage pulse width of each period of the switching angle of the square wave can be flexibly adjusted according to the noise requirement of motor application products, the excessive quality of products with low noise requirement is avoided, and the cost loss and the cost waste are avoided.
4. The invention can generate smoother output waveform by optimizing the SHEPWM modulation method, thereby reducing harmonic interference and noise and improving the anti-interference capability of the motor and the stability of output voltage; meanwhile, parameters such as frequency, phase and amplitude of the output voltage can be controlled more flexibly by adopting the SHEPWM technology.
5. According to the invention, the Hall signal is filtered in a moving average filtering mode, so that periodic noise and high-frequency noise in the Hall signal can be effectively removed, and the smoothness of the Hall signal is improved; and the calculated amount calculated by the average value is small, so that the calculation efficiency is high, the real-time performance is good, and the response speed of the system is improved.
The invention is described in further detail below with reference to the drawings and the detailed description.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a single-phase inverter of the prior art.
Fig. 2 is a method flow diagram of an embodiment of a noise reduction method for a shawm-based sensored single phase motor of the present invention.
Fig. 3 is a flowchart of hall signal processing for different numbers of switching angles according to an embodiment of a noise reduction method for a shawm-based inductive single phase motor of the present invention.
FIG. 4 is a waveform diagram of a 4-switch angle square wave versus a square wave on-time in an embodiment of a noise reduction method for a SHEPWM-based inductive single phase motor according to the present invention, wherein (1) is a Hall signal waveform; (2) the waveform of the upper bridge arm of the phase A; (3) the waveform of the lower bridge arm of the phase A; (4) is a B-phase lower bridge arm waveform.
FIG. 5 is a waveform diagram of a 4-switch angle square wave with respect to switch angle time in an embodiment of a noise reduction method for a SHEPWM-based inductive single phase motor according to the present invention, wherein (1) is a Hall signal waveform; (2) the waveform of the upper bridge arm of the phase A; (3) the waveform of the lower bridge arm of the phase A; (4) is a B-phase lower bridge arm waveform.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
Referring to fig. 2, the noise reduction method for the sensing single-phase motor based on the SHEPWM provided by the invention comprises the following steps:
s1: based on the SHEPWM modulation mode, the relation between the number of the quarter-period symmetrical waveform switching angles, the angle value and the harmonic frequency is obtained, and accordingly the number of the switching angles of each period of the square wave is preset.
Specifically, the embodiment modulates the PWM modulation signal through the high-frequency edge of the sinusoidal variation of the alternating current based on the shewm modulation mode, firstly, phase shifts the clock signal by adopting time base error phase shift to obtain a group of clock signals with a plurality of phase differences, and then uses the clock signals as the time base of the PWM modulation signal to perform the edge modulation of the sinusoidal variation of the high frequency, thereby obtaining the equivalent sine wave output signal.
S2: and capturing and processing a Hall signal of the motor, and acquiring a count value of a switching angle, a count value of arrival of the Hall signal and a count value of phase voltage pulse width of the motor.
Specifically, the noise reduction method of the embodiment is applied to a sensitive single-phase motor, wherein a hall sensor is arranged on the single-phase motor, or is applied to a single-phase hall direct current motor, when current passes through a winding coil of the motor, a magnetic field is generated, and the magnetic field of the magnetic steel interacts with the current magnetic field to generate a rotation moment so as to enable a rotor to rotate. The Hall sensor generates a corresponding electric signal according to the position of the magnetic steel on the rotor and feeds back the Hall signal to the controller. The controller adjusts the rotating speed and the direction of the motor according to the Hall signal, and obtains the count value of the switch angle, the count value coming from the Hall signal and the count value of the phase voltage pulse width of the motor through the counter chip.
The controller realizes the work of motor control, SHEPWM related angle calculation and the like, and adopts an FPGA chip for realizing the control of PWM modulation signal output.
S3: the switching angle of the square wave and the conduction time thereof are set by calculating the angle of the switching angle per cycle and the phase voltage pulse width.
S4: generating SHEPWM pulse, performing noise test, obtaining the waveform of the square wave at the moment, and judging whether the noise requirement is met according to the times of harmonic components in the waveform.
S5: if the noise requirement is not met, the number of the switching angles, the angle values of the switching angles and the phase voltage pulse width are adjusted every cycle, and the step S2 is repeated, so that harmonic components are eliminated until the noise requirement is met.
According to the embodiment, based on a SHEPWM modulation mode, a preset number of switch angles are formed in a square wave, hall signals of a motor in each period are captured through a Hall sensor, count values of the switch angles, the arrival count values of the Hall signals and the phase voltage pulse width of the motor are obtained through a counter, so that angles of the switch angles and the phase voltage pulse width in each period are calculated according to an empirical formula, after noise testing, the number of harmonic frequencies in the square wave waveform at the moment are analyzed, the number of the switch angles, the angles and the phase voltage pulse width are adjusted according to the change of the harmonic frequencies of the waveform obtained by the next noise testing, the process is repeated until harmonic components are eliminated or the phase voltage pulse width is reduced to a large extent, and therefore the requirement of a product on noise is met.
Specifically, in this embodiment, if the angle value and the number of the switching angles are increased, the voltage pulse width value will be correspondingly reduced; if the angle value and the number of the switching angles are reduced, the voltage pulse width value will correspondingly increase.
Specifically, the fourier series expansion form of the bipolar shawm output voltage waveform of this embodiment is expressed as:
(1)
wherein n is the frequency of fundamental wave and each subharmonic,is cosine coefficient>Is sine coefficient +.>Angular frequency, t is time.
(1) Wherein:
(2)
for a quarter-period symmetric waveform, there are:
(3)
wherein:
(4)
assuming that the waveform has a unit amplitude, i.eThen->The following can be found:
(5)
the formula is as follows:
(6)
the first and last terms in equation (5) are derived as:
(7)
substituting formula (7) into formula (5) to obtain other integral terms in the formula, the integral terms can be obtained:
(8)
wherein k represents a value of [0, pi/2 ]]The number of switching angles in the interval,the angle value of the ith switching angle out of k switching angles in the interval is represented, and n is the number of times of the fundamental wave and each subharmonic.
In this embodiment, in step S1, square waves with the number of switching angles of 4 are preset, and then the number of switching angles after each adjustment is twice the number of current switching angles.
According to the embodiment, the angle, the number and the phase voltage pulse width of the switching angle in each period are determined through simple calculation and noise test waveforms, the traditional square wave drive is adopted, the rotor position is obtained through the Hall sensor, the advantages of simple control scheme and low cost of forced commutation of the Hall signal can be considered, meanwhile, a large number of harmonic components in the square wave current are gradually filtered until the noise index is reached, a breakthrough scheme is provided for noise reduction of the motor, the square wave drive scheme can be applied to a plurality of household products, and the method has wide application prospects and market values.
In this embodiment, when square waves with a number of 4 switch angles are adopted, the processing manner of the hall signal is as follows:
further comprising step S21: the first four period captured hall signals are respectively a first hall signal, a second hall signal, a third hall signal and a fourth hall signal, and then the second hall signal, the third hall signal, the fourth hall signal and the first hall signal are sequentially used for each period position signal from the current period position signal.
Specifically, in the present embodiment, the first four period capturing signals are P0, P1, P2, and P3, and then the current period position signal uses P2, the next period position signal uses P3, and so on.
In this embodiment, step S22 is further included: when square waves with the number of the switch angles being more than or equal to 8 are adopted, the Hall signals are filtered by adopting a moving average, the Hall signals captured in each period are averaged, and the average value is used as the position signal of the period, so that random noise in the Hall signals is averaged.
Specifically, in this embodiment, the current period capturing position signal is P2, and then the current period capturing position signal is averaged with P0, P1, and P3 captured in the previous period to obtain the current period position signal, and so on.
The Hall signal is filtered in a moving average filtering mode, so that periodic noise and high-frequency noise in the Hall signal can be effectively removed, and the smoothness of the Hall signal is improved; and the calculated amount calculated by the average value is small, so that the calculation efficiency is high, the real-time performance is good, and the response speed of the system is improved.
In this embodiment, when square waves of 4 switching angles are taken, the angle value of each switching angle at this time is:
wherein c is the count value of the arrival of the Hall signal, and d is the count value of the switching angle.
In this embodiment, when taking a square wave of 4 switching angle numbers, the phase voltage pulse width at this time is:
where e is the count value of the phase voltage pulse width.
In this embodiment, the on-time of the switch angle is about one tenth of the on-time of the square wave.
The motor noise reduction method provided by the embodiment is very strong in flexibility, the angle, the number and the phase voltage pulse width of the switching angle of each period of the square wave can be flexibly adjusted according to the noise requirement of motor application products, excessive product quality with low noise requirement is avoided, cost loss and waste are caused, the test times are flexibly reduced, the labor and production cost of motor noise reduction can be reduced, and the balance point of motor noise reduction quality and product cost is achieved.
In this embodiment, in step S5, if the number of switching angles, the angle values of the switching angles, and the phase voltage pulse width are adjusted so that the harmonic component increases during the noise test, the angle values and the number of switching angles are reversely adjusted based on the previous value.
In this embodiment, the high-frequency rotation speed of the single-phase motor is fixed to 18000±500rpm, and when a square wave with 4 switching angles is adopted, the conduction time of the square wave is 412 μs, and at this time, the conduction time of the switching angle is 44 μs; when the 8-switch-angle square wave is adopted, the conduction time of the square wave is 361 mu s, and at the moment, the conduction time of the switch angle is 26 mu s.
As shown in FIG. 5, with 565Hz as the fundamental frequency, the experimental noise test result of the single-phase permanent magnet synchronous motor carried with the blower controller shows that the noise test result is 79.3dB, which is lower than 85 dB, the 21 st harmonic wave is reduced, the human ear does not obviously feel the hidden 'metal impact' sound, and the production noise reject ratio is 0.025%.
According to the embodiment, smoother output waveforms can be generated by optimizing the SHEPWM modulation method, so that harmonic interference and noise are reduced, and the anti-interference capacity of the motor and the stability of output voltage are improved; meanwhile, parameters such as frequency, phase and amplitude of the output voltage can be controlled more flexibly by adopting the SHEPWM technology.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (devices), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The foregoing has outlined the more detailed description of the method and system provided herein, and the detailed description of the principles and embodiments of the present application has been presented herein with the application of a specific example, the above description of the example being provided only to facilitate the understanding of the method and core concepts of the present application; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
The above embodiments are only preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, but any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention are intended to be within the scope of the present invention as claimed.
Claims (5)
1. A method of noise reduction for a shawm-based sensored single phase motor comprising:
s1: based on a SHEPWM modulation mode, obtaining the relation among the number of quarter-period symmetrical waveform switching angles, angle values and harmonic frequencies, and presetting the number of the switching angles of each period of the square wave according to the relation;
s2: capturing and processing a Hall signal of a motor, and acquiring a count value of a switching angle, a count value of arrival of the Hall signal and a count value of phase voltage pulse width of the motor;
s3: setting the switching angle and the conduction time of the square wave by calculating the angle of the switching angle and the phase voltage pulse width of each period;
s4: generating SHEPWM pulses, performing noise test, obtaining the waveform of the square wave at the moment, and judging whether the noise requirement is met according to the times of harmonic components in the waveform;
s5: if the noise requirement is not met, the number of the switching angles, the angle values of the switching angles and the phase voltage pulse width of each period are adjusted, and the step S2 is repeated, so that harmonic components are eliminated until the noise requirement is met;
in the step S1, square waves with the number of 4 switch angles are preset, and then the number of switch angles after each adjustment is twice the number of current switch angles;
when square waves with the number of 4 switch angles are adopted, the processing mode of the Hall signals is as follows:
step S21: the first four period captured Hall signals are respectively a first Hall signal, a second Hall signal, a third Hall signal and a fourth Hall signal, and each period position signal sequentially uses the second Hall signal, the third Hall signal, the fourth Hall signal and the first Hall signal from the current period position signal;
step S22: when square waves with the number of the switch angles being more than or equal to 8 are adopted, the Hall signals are filtered by adopting a moving average, the Hall signals captured in each period are averaged, and the average value is used as the position signal of the period, so that random noise in the Hall signals is averaged;
when taking a square wave of 4 switching angles, the angle value of each switching angle at this time is:
wherein c is the count value of the arrival of the Hall signal, and d is the count value of the switching angle;
when taking square waves of 4 switching angle numbers, the phase voltage pulse width is:
where e is the count value of the phase voltage pulse width.
2. The method according to claim 1, characterized in that it comprises:
the fourier series expanded version of the bipolar shawm output voltage waveform is expressed as:
(1)
based on the SHEPWM modulation mode, a waveform with quarter-period symmetry is adopted, and the waveform only contains sine terms and odd harmonic components, so that the waveform comprises the following components:
(3)
wherein n is the frequency of fundamental wave and each subharmonic,is cosine coefficient>Is sine coefficient +.>Angular frequency, t is time.
3. The method according to claim 2, characterized by comprising:
assuming that the waveform has a unit amplitude, i.eThen get +.>The method comprises the following steps:
(8)
wherein k represents a value of [0, pi/2 ]]The number of switching angles in the interval,the angle value of the ith switch angle of the k switch angles in the interval is represented.
4. The method according to claim 1, characterized in that:
in step S5, if the number of switching angles, the angle values of the switching angles, and the phase voltage pulse width are adjusted so that the harmonic component increases during the noise test, the angle values and the number of the switching angles are reversely adjusted based on the previous value.
5. The method according to claim 1, characterized in that:
the high-frequency rotating speed of the single-phase motor is fixed to 18000+/-500 rpm, when a 4-switch-angle square wave is adopted, the conduction time of the square wave is 412 mu s, and at the moment, the conduction time of the switch angle is 44 mu s; when the 8-switch-angle square wave is adopted, the conduction time of the square wave is 361 mu s, and at the moment, the conduction time of the switch angle is 26 mu s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311528285.1A CN117240145B (en) | 2023-11-16 | 2023-11-16 | Noise reduction method of sensitive single-phase motor based on SHEPWM |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311528285.1A CN117240145B (en) | 2023-11-16 | 2023-11-16 | Noise reduction method of sensitive single-phase motor based on SHEPWM |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117240145A CN117240145A (en) | 2023-12-15 |
| CN117240145B true CN117240145B (en) | 2024-02-23 |
Family
ID=89084825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311528285.1A Active CN117240145B (en) | 2023-11-16 | 2023-11-16 | Noise reduction method of sensitive single-phase motor based on SHEPWM |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117240145B (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295935A (en) * | 2007-12-10 | 2008-10-29 | 西北工业大学 | Optimizing PWM modulation method capable of restraining harmonic wave |
| CN106786770A (en) * | 2017-01-19 | 2017-05-31 | 株洲中车时代电气股份有限公司 | A kind of photovoltaic inversion unit and three-phase photovoltaic grid-connected TRT |
| CN107565870A (en) * | 2017-08-30 | 2018-01-09 | 深圳市天祜智能有限公司 | Family expenses cooking machine Hall closed loop control method |
| CN108322077A (en) * | 2018-03-28 | 2018-07-24 | 中车青岛四方车辆研究所有限公司 | Variable duration impulse system based on SHEPWM and modulator approach |
| CN108683350A (en) * | 2018-05-25 | 2018-10-19 | 西安理工大学 | A kind of three level NPC converter particular harmonics optimization modulation strategy |
| CN112803717A (en) * | 2021-01-20 | 2021-05-14 | 华北电力大学 | SHEPWM control system and method for controlling output voltage of high-power converter |
| CN115459567A (en) * | 2022-09-02 | 2022-12-09 | 北方工业大学 | Three-level pulse width modulation optimization method and device |
-
2023
- 2023-11-16 CN CN202311528285.1A patent/CN117240145B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101295935A (en) * | 2007-12-10 | 2008-10-29 | 西北工业大学 | Optimizing PWM modulation method capable of restraining harmonic wave |
| CN106786770A (en) * | 2017-01-19 | 2017-05-31 | 株洲中车时代电气股份有限公司 | A kind of photovoltaic inversion unit and three-phase photovoltaic grid-connected TRT |
| CN107565870A (en) * | 2017-08-30 | 2018-01-09 | 深圳市天祜智能有限公司 | Family expenses cooking machine Hall closed loop control method |
| CN108322077A (en) * | 2018-03-28 | 2018-07-24 | 中车青岛四方车辆研究所有限公司 | Variable duration impulse system based on SHEPWM and modulator approach |
| CN108683350A (en) * | 2018-05-25 | 2018-10-19 | 西安理工大学 | A kind of three level NPC converter particular harmonics optimization modulation strategy |
| CN112803717A (en) * | 2021-01-20 | 2021-05-14 | 华北电力大学 | SHEPWM control system and method for controlling output voltage of high-power converter |
| CN115459567A (en) * | 2022-09-02 | 2022-12-09 | 北方工业大学 | Three-level pulse width modulation optimization method and device |
Non-Patent Citations (2)
| Title |
|---|
| Bipolar SHEPWM for Pure Sine Wave Single-Phase Inverter;Aymen Chaaira et al;《2022 5th International Conference on Advanced Systems and Emergent Technologies (IC_ASET)》;第127-131页 * |
| 大功率牵引变流器电流谐波最小PWM控制策略的研究与实现;赵震;《铁道机车车辆》;第39卷(第4期);第1-5，110页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117240145A (en) | 2023-12-15 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2019085106A1 (en) | Electric motor control system and inverter air conditioner | |
| CN109525152A (en) | Motor drive control method, device and circuit | |
| CN109039171A (en) | A kind of high-speed permanent-magnet brushless DC motor control method based on variable turn-on cycle | |
| CN109743001A (en) | A kind of refrigerator direct current is without sensing compressor variable frequency controller and control method | |
| CN105680740A (en) | High-rotation speed brushless DC motor position-sensorless control method | |
| CN101237216A (en) | Method for improving frequency converter frequency via 7-section space vector calculation | |
| Kumar et al. | BL-CSC converter fed BLDC motor drive with sensorless control | |
| CN117240145B (en) | Noise reduction method of sensitive single-phase motor based on SHEPWM | |
| CN105429547B (en) | Single-phase brushless direct-current motor vector control method based on virtual phase structure | |
| Tsotoulidis et al. | A sensorless commutation technique of a brushless DC motor drive system using two terminal voltages in respect to a virtual neutral potential | |
| Kumar et al. | A simple four-phase switched reluctance motor drive for ceiling fan applications | |
| Chang et al. | Current sensorless field-oriented control of induction motors | |
| Kan et al. | Adaptive wide angle PWM control strategy of BLDC motor drive for efficiency optimization and wide speed control range | |
| Chern et al. | Sensorless speed control of BLDC motor using six step square wave and rotor position detection | |
| EP2665178A2 (en) | System and method for sensor-less hysteresis current control of permanent magnet synchronous generators without rotor position information | |
| CN115842489A (en) | Brushless direct current motor optimization method applied to drum washing machine | |
| CN106788032B (en) | Alternating current generator rotary speed tracing control method | |
| Promthong et al. | Sensorless control of BLDC motor drive with 150° conducting mode to minimize torque ripple | |
| Wang et al. | A commutation optimization strategy for high speed brushless DC drives with inaccurate rotor position signals | |
| Zhu et al. | Improve direct torque control performance of induction motor with duty ratio modulation | |
| Wang et al. | A Commutation Optimization Strategy for High-Speed Brushless DC Drives With Voltage Source Inverter | |
| Niasar et al. | A low-cost sensorless BLDC motor drive using one-cycle current control strategy | |
| Lin et al. | Space-vector PWM techniques for a two-phase permanent magnet synchronous motor considering a reduction in switching losses | |
| Bolognani et al. | Sensorless control of PM synchronous motors with non-sinusoidal back EMF for home appliance | |
| Dey et al. | Nearly constant switching frequency hysteresis current controller with fast online computation of boundary for a 2-level induction motor drive |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |