CN111817643A - Motor noise reduction system and method based on microphone array noise monitoring - Google Patents
Motor noise reduction system and method based on microphone array noise monitoring Download PDFInfo
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- CN111817643A CN111817643A CN202010589963.5A CN202010589963A CN111817643A CN 111817643 A CN111817643 A CN 111817643A CN 202010589963 A CN202010589963 A CN 202010589963A CN 111817643 A CN111817643 A CN 111817643A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/175—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general using interference effects; Masking sound
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Abstract
The invention discloses a motor noise reduction system and method based on microphone array noise monitoring, and belongs to the field of motor noise monitoring methods. The utility model provides a motor noise reduction system based on microphone array noise monitoring, the system includes power, microphone array module, main motor, motor circuit control module, first feedback motor, second feedback motor and embedded module, and the microphone array is placed towards main motor, and the microphone array module is connected with embedded module, and motor circuit control module is connected with main motor, first feedback motor and second feedback motor respectively, and the power is the power supply of motor noise reduction system. The invention solves the problem of online monitoring of the noise of the motor, can monitor the noise emitted by the motor according to the using condition and using scene of the motor, further feeds the noise back to the control mechanism, changes parameters such as input current and voltage of the motor, changes the real-time noise emitted by the motor, and achieves the purpose of reducing the noise.
Description
Technical Field
The invention relates to a motor noise reduction system and method based on microphone array noise monitoring, and belongs to the field of motor noise monitoring methods.
Background
How to monitor the motor noise to dynamically adjust the motor noise reduction is a technical problem often related to technical personnel in the field.
In the prior art, the noise volume is observed manually, and whether the noise exceeds the standard or not is monitored in a manual judgment mode, so that the noise volume of the motor is manually adjusted. This method is awkward and not accurate and inefficient to adjust. In addition, most of the existing noise reduction methods only make an article at a noise source, and noise reduction is carried out by adopting a noise reduction protective cover additionally arranged, so that the noise reduction effect is very limited.
Disclosure of Invention
The invention aims to provide a motor noise reduction system and a method based on microphone array noise monitoring, which are mainly used for noise monitoring of a permanent magnet motor and can also be used for noise monitoring of other motors. The invention solves the problem of online monitoring of the noise of the motor, can monitor the noise emitted by the motor according to the using condition and using scene of the motor, further feeds the noise back to the control mechanism, changes parameters such as input current and voltage of the motor, changes the real-time noise emitted by the motor, and achieves the purpose of reducing the noise.
The utility model provides a motor noise reduction system based on microphone array noise monitoring, the system includes power, microphone array module, main motor, motor circuit control module, first feedback motor, second feedback motor and embedded module, the microphone array orientation main motor is placed, the microphone array module with embedded module connects, motor circuit control module respectively with main motor first feedback motor with second feedback motor connects, the power does the power supply of motor noise reduction system.
Further, the microphone array module is used for collecting background noise and electromagnetic noise emitted by the main motor, converting the background noise and the electromagnetic noise into voice signals and sending the voice signals to the embedded module;
the embedded module is used for receiving the voice signals of the microphone array module, analyzing and processing the voice signals, randomly adjusting the vibration frequencies of the first feedback motor and the second feedback motor through the motor circuit control module, and adjusting the input current of the main motor;
the motor circuit control module is controlled by the embedded module, controls the vibration frequency of the first feedback motor and the second feedback motor by generating two paths of random current and voltage, and is controlled by the embedded module to regulate the input current of the main motor;
the first feedback motor and the second feedback motor are used for randomly generating radial electromagnetic force to influence the electromagnetic force generated by the main motor;
and the main motor is used for being controlled by the motor circuit control module to work.
Further, the first and second feedback motors are installed at a main body case of the main motor.
Further, the vibration frequencies of the first feedback motor and the second feedback motor are different.
A motor noise reduction method based on microphone array noise monitoring is applied to the motor noise reduction system based on microphone array noise monitoring, and comprises the following steps:
step one, setting a noise threshold B, and starting a main motor to work after a microphone array module collects background noise B1;
secondly, when the main motor starts to rotate, the microphone array module collects the body noise of the main motor, when the noise of the main motor is increased, excessive noise is generated, namely the main motor generates electromagnetic noise B2, and the microphone array module collects electromagnetic noise B2;
step three, the embedded module receives the background noise B1 and the electromagnetic noise B2, judges whether the difference between the electromagnetic noise B2 and the background noise B1 is larger than a noise threshold B, and if so, executes step four; otherwise, returning to the step two;
the embedded module starts a first feedback motor through the motor circuit control module, random current is input to the first feedback motor, the first feedback motor generates random vibration, and then the fixed vibration frequency of the main motor is changed;
step five, the microphone array module collects a noise value B3;
step six, the embedded module receives the noise value B3, and judges whether the difference between the noise value B3 and the background noise B1 is greater than a noise threshold value B, if so, the step seven is executed; otherwise, returning to the step five;
step seven, the embedded module provides random current and voltage for the first feedback motor and the second feedback motor through the motor circuit control module, so that the first feedback motor and the second feedback motor generate random vibration, the vibration frequency of the whole main motor, the first feedback motor and the second feedback motor is changed, and the whole noise is changed;
step eight, the microphone array module collects a noise value B4;
step nine, the embedded module receives the noise value B4, and judges whether the difference between the noise value B4 and the background noise B1 is greater than a noise threshold value B, if so, the step ten is executed; otherwise, returning to the step eight;
step ten, changing the input current harmonic value of the main motor;
eleven, collecting a noise value B5 by a microphone array module;
step twelve, the embedded module receives the noise value B5, and judges whether the difference between the noise value B5 and the background noise B1 is greater than the noise threshold value B, if yes, the step four is returned; otherwise, returning to the step eleven.
The main advantages of the invention are:
(1) the microphone array sensor is used for monitoring the noise condition of the motor during working, and further realizes control and reduction of the noise of the main motor by feeding back the vibration frequency of the main motor interfered by the working of the motor. The invention can reduce the noise of the main motor in an active intervention mode, and can set the tolerable noise intensity by setting a threshold value.
(2) The invention adopts an embedded control mode, so that the motor control is intelligentized, the motor application scene is wider, and the motor can be applied to various low-noise industries such as household appliances, automobiles and the like.
Drawings
Fig. 1 is a schematic structural diagram of a motor noise reduction system based on microphone array noise monitoring according to the present invention;
fig. 2 is a flowchart of a method of a motor noise reduction method based on microphone array noise monitoring according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the invention discloses an embodiment of a motor noise reduction system based on microphone array noise monitoring, the system includes a power supply, a microphone array module, a main motor, a motor circuit control module, a first feedback motor, a second feedback motor and an embedded module, the microphone array is placed towards the main motor, the microphone array module is connected with the embedded module, the motor circuit control module is respectively connected with the main motor, the first feedback motor and the second feedback motor, and the power supply supplies power to the motor noise reduction system.
Further, the microphone array module is used for collecting background noise and electromagnetic noise emitted by the main motor, converting the background noise and the electromagnetic noise into voice signals and sending the voice signals to the embedded module;
the embedded module is used for receiving the voice signals of the microphone array module, analyzing and processing the voice signals, randomly adjusting the vibration frequencies of the first feedback motor and the second feedback motor through the motor circuit control module, and adjusting the input current of the main motor; the module is composed of an embedded system and can receive and identify the voice signals of the microphone array module so as to carry out voice algorithm identification. After the current is switched on, the embedded module receives background noise of the microphone array module, when the main motor works, the electromagnetic noise of the main motor is received, the noise of the main motor is calculated through difference, and whether the noise reaches a threshold value B is judged, wherein the noise threshold value B is a preset value, namely a highest tolerated noise value. When the difference noise values B2, B3, B4 and B5 are larger than the threshold noise B, the embedded module controls the motor circuit control module to generate random current and voltage, so that the first feedback motor and the second feedback motor generate vibration randomly to influence the vibration noise of the main motor, and simultaneously the embedded module controls the motor circuit control module to change the harmonic current of the input current of the main motor, so that the overall noise of the system is reduced.
The motor circuit control module is controlled by the embedded module, controls the vibration frequency of the first feedback motor and the second feedback motor by generating two paths of random current and voltage, and is controlled by the embedded module to regulate the input current of the main motor; the module can generate current and voltage for enabling each motor to work, the frequency of the current and the voltage is variable, the module is controlled by the embedded module, two paths of random current and voltage signals can be generated randomly, and then the first feedback motor and the second feedback motor are controlled, so that the vibration frequency of the two paths of feedback motors is different, the radial electromagnetic force of the two paths of feedback motors is different in size and direction, and the two paths of feedback motors are integrated with the generated radial force and direction of the main motor to influence the vibration of the surface of the stator of the main motor.
The first feedback motor and the second feedback motor are used for randomly generating radial electromagnetic force to influence the electromagnetic force generated by the main motor; the two-way feedback motor can randomly generate radial electromagnetic force when working, so that the electromagnetic force generated by the main motor is influenced, the size and the direction of the electromagnetic force generated by the main motor can be changed due to the feedback motor to form comprehensive radial electromagnetic force, the size and the direction of the comprehensive radial electromagnetic force are different from those of the original electromagnetic force generated by the main motor, the stator surface vibration of the main motor is reduced, and the noise is reduced.
The main motor is used for being controlled by the motor circuit control module to work; when the main motor works, radial electromagnetic force is generated, and the electromagnetic force can lead the surface of the stator to vibrate, so that high vibration noise is generated.
Further, the first and second feedback motors are installed at a main body case of the main motor.
Further, the vibration frequencies of the first feedback motor and the second feedback motor are different.
Specifically, the first feedback motor and the second feedback motor are small motors and are arranged at the position of a main motor main body shell, and the vibration of the feedback motors can change the vibration frequency of the whole system, so that the natural frequency of the main motor is changed, and the noise is reduced. The feedback motor has smaller power, the embedded module can manage and control the motor circuit control module, so that random current and voltage are generated and input to the first feedback motor and the second feedback motor, the input current and voltage of each feedback motor are different, vibration is generated differently, and the natural working frequency of the whole system including the main motor is changed, so that the surface vibration of the stator core of the main motor is changed, and the surface vibration radiation noise of the main motor point is changed. The motor circuit control module can generate input current for controlling the main motor and can change the harmonic current value of the input current of the main motor.
Referring to fig. 2, the present invention discloses an embodiment of a motor noise reduction method based on microphone array noise monitoring, which is applied to the above-mentioned motor noise reduction system based on microphone array noise monitoring, and the motor noise reduction method includes the following steps:
step one, setting a noise threshold B, and starting a main motor to work after a microphone array module collects background noise B1;
secondly, when the main motor starts to rotate, the microphone array module collects the body noise of the main motor, when the noise of the main motor is increased, excessive noise is generated, namely the main motor generates electromagnetic noise B2, and the microphone array module collects electromagnetic noise B2;
step three, the embedded module receives the background noise B1 and the electromagnetic noise B2, judges whether the difference between the electromagnetic noise B2 and the background noise B1 is larger than a noise threshold B, and if so, executes step four; otherwise, returning to the step two;
the embedded module starts a first feedback motor through the motor circuit control module, random current is input to the first feedback motor, the first feedback motor generates random vibration, and then the fixed vibration frequency of the main motor is changed;
step five, the microphone array module collects a noise value B3;
step six, the embedded module receives the noise value B3, and judges whether the difference between the noise value B3 and the background noise B1 is greater than a noise threshold value B, if so, the step seven is executed; otherwise, returning to the step five;
step seven, the embedded module provides random current and voltage for the first feedback motor and the second feedback motor through the motor circuit control module, so that the first feedback motor and the second feedback motor generate random vibration, the vibration frequency of the whole main motor, the first feedback motor and the second feedback motor is changed, and the whole noise is changed;
step eight, the microphone array module collects a noise value B4;
step nine, the embedded module receives the noise value B4, and judges whether the difference between the noise value B4 and the background noise B1 is greater than a noise threshold value B, if so, the step ten is executed; otherwise, returning to the step eight;
step ten, changing the input current harmonic value of the main motor;
eleven, collecting a noise value B5 by a microphone array module;
step twelve, the embedded module receives the noise value B5, and judges whether the difference between the noise value B5 and the background noise B1 is greater than the noise threshold value B, if yes, the step four is returned; otherwise, returning to the step eleven.
Claims (5)
1. The utility model provides a motor noise reduction system based on microphone array noise monitoring, a serial communication port, the system includes power, microphone array module, main motor, motor circuit control module, first feedback motor, second feedback motor and embedded module, the microphone array orientation main motor is placed, the microphone array module with embedded module connects, motor circuit control module respectively with main motor first feedback motor with the second feedback motor is connected, the power does the power supply of motor noise reduction system.
2. The motor noise reduction system based on microphone array noise monitoring of claim 1,
the microphone array module is used for collecting background noise and electromagnetic noise emitted by the main motor, converting the background noise and the electromagnetic noise into voice signals and sending the voice signals to the embedded module;
the embedded module is used for receiving the voice signals of the microphone array module, analyzing and processing the voice signals, randomly adjusting the vibration frequencies of the first feedback motor and the second feedback motor through the motor circuit control module, and adjusting the input current of the main motor;
the motor circuit control module is controlled by the embedded module, controls the vibration frequency of the first feedback motor and the second feedback motor by generating two paths of random current and voltage, and is controlled by the embedded module to regulate the input current of the main motor;
the first feedback motor and the second feedback motor are used for randomly generating radial electromagnetic force to influence the electromagnetic force generated by the main motor;
and the main motor is used for being controlled by the motor circuit control module to work.
3. The microphone array noise monitoring based motor noise reduction system of claim 2, wherein the first and second feedback motors are mounted at a main housing of the main motor.
4. The motor noise reduction system based on microphone array noise monitoring of claim 3, wherein the first feedback motor and the second feedback motor have different vibration frequencies.
5. A motor noise reduction method based on microphone array noise monitoring is applied to a motor noise reduction system based on microphone array noise monitoring as claimed in any one of claims 1-4, and is characterized in that the motor noise reduction method comprises the following steps:
step one, setting a noise threshold B, and starting a main motor to work after a microphone array module collects background noise B1;
secondly, when the main motor starts to rotate, the microphone array module collects the body noise of the main motor, when the noise of the main motor is increased, excessive noise is generated, namely the main motor generates electromagnetic noise B2, and the microphone array module collects electromagnetic noise B2;
step three, the embedded module receives the background noise B1 and the electromagnetic noise B2, judges whether the difference between the electromagnetic noise B2 and the background noise B1 is larger than a noise threshold B, and if so, executes step four; otherwise, returning to the step two;
the embedded module starts a first feedback motor through the motor circuit control module, random current is input to the first feedback motor, the first feedback motor generates random vibration, and then the fixed vibration frequency of the main motor is changed;
step five, the microphone array module collects a noise value B3;
step six, the embedded module receives the noise value B3, and judges whether the difference between the noise value B3 and the background noise B1 is greater than a noise threshold value B, if so, the step seven is executed; otherwise, returning to the step five;
step seven, the embedded module provides random current and voltage for the first feedback motor and the second feedback motor through the motor circuit control module, so that the first feedback motor and the second feedback motor generate random vibration, the vibration frequency of the whole main motor, the first feedback motor and the second feedback motor is changed, and the whole noise is changed;
step eight, the microphone array module collects a noise value B4;
step nine, the embedded module receives the noise value B4, and judges whether the difference between the noise value B4 and the background noise B1 is greater than a noise threshold value B, if so, the step ten is executed; otherwise, returning to the step eight;
step ten, changing the input current harmonic value of the main motor;
eleven, collecting a noise value B5 by a microphone array module;
step twelve, the embedded module receives the noise value B5, and judges whether the difference between the noise value B5 and the background noise B1 is greater than the noise threshold value B, if yes, the step four is returned; otherwise, returning to the step eleven.
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| WO2022096225A1 (en) * | 2020-11-03 | 2022-05-12 | Bayerische Motoren Werke Aktiengesellschaft | Method and device for active control of vibrations in a vehicle having a plurality of electric machine units |
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