Active damping system and method of variable frequency driving motor

Abstract

The invention provides an active vibration reduction system and method for a variable-frequency driving motor, and belongs to the technical field of acoustic engineering, and the system comprises a vibration collection module which is used for collecting vibration data during the operation of the driving motor, and carrying out the calculation based on the vibration data to obtain a vibration waveform; the vibration data comprises the vibration frequency and the rotating speed of the driving motor; the harmonic calculation output module is in communication connection with the vibration acquisition module and is used for calculating harmonic parameters based on the vibration waveform; and the variable frequency driving control module is in communication connection with the harmonic calculation output module and is used for carrying out active harmonic injection on a driving motor based on the harmonic parameters so as to reduce electromagnetic noise of the driving motor. An active harmonic injection mode is adopted, active harmonic injection noise reduction is achieved by counteracting electromagnetic noise generated in the working process of the driving motor, and the technical problem that the electromagnetic noise generated by frequency converter harmonic waves cannot be accurately reduced or eliminated in an existing scheme is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of acoustic engineering, and in particular to an active vibration reduction system and method for a variable frequency drive motor. Background Art

[0002] Active vibration reduction is widely used in vibration and noise control fields such as electric vehicles, high-precision manufacturing equipment, aerospace, and high-performance ships.

[0003] The vibration data controller is usually used as an intermediate link between the data acquisition system and the output of the variable frequency drive control system. The variable frequency drive control system can achieve a wide range of high-speed continuous speed control and adapt to a variety of complex working environments. However, the inverter will generate harmonics when supplying power. The harmonics will generate electromagnetic force at the motor core, causing motor vibration, that is, motor noise. Traditional motor noise reduction is mainly to control noise from the motor body. For example, changing the shape of the base can reduce the motor vibration noise to a certain extent, but it cannot accurately reduce or eliminate the electromagnetic noise generated by the inverter harmonics. Summary of the invention

[0004] In view of this, it is necessary to provide an active vibration reduction system and method for a variable frequency drive motor to solve the technical problem that existing solutions cannot accurately reduce or eliminate the electromagnetic noise generated by the harmonics of the inverter.

[0005] In order to solve the above problems, on the one hand, the present invention provides an active vibration reduction system for a variable frequency drive motor, comprising: A vibration collection module, used to collect vibration data of the driving motor when it is running, and calculate a vibration waveform based on the vibration data; the vibration data includes the vibration frequency and rotation speed of the driving motor; A harmonic calculation output module, which is in communication with the vibration acquisition module and is used to calculate harmonic parameters based on the vibration waveform; The variable frequency drive control module is communicatively connected with the harmonic calculation output module and is used for actively injecting harmonics into the drive motor based on the harmonic parameters to reduce the electromagnetic noise of the drive motor.

[0006] In a possible implementation, the vibration collection module includes: A vibration sensor is fixed on the drive motor and is used to collect vibration data of the drive motor; A vibration control box is connected to the vibration sensor for calculating a vibration waveform based on the vibration data.

[0007] In a possible implementation manner, the harmonic parameter includes waveform data opposite to the vibration waveform.

[0008] In a possible implementation, the electromagnetic noise includes: electromagnetic vibration noise generated by electromagnetic force harmonics of the driving motor body, stator natural frequency, or rotor eccentricity.

[0009] In a possible implementation, the variable frequency drive control module is further used to control the drive motor to operate under a silent condition when controlling the drive motor to start.

[0010] On the other hand, the present invention further provides an active vibration reduction method for a variable frequency drive motor, the method being applied to the active vibration reduction system for the variable frequency drive motor described above, the method comprising: The vibration data of the driving motor when it is running is collected based on the vibration collection module, and the vibration waveform is calculated based on the vibration data; the vibration data includes the vibration frequency and rotation speed of the driving motor; Based on the harmonic calculation output module, and using the vibration waveform, the harmonic parameters are calculated; Based on the variable frequency drive control module, the harmonic parameters are combined to perform active harmonic injection on the drive motor to reduce the electromagnetic noise of the drive motor.

[0011] In a possible implementation, the vibration data of the driving motor during operation is collected based on the vibration collection module, and the vibration waveform is calculated based on the vibration data, including: Based on the vibration sensor fixed on the driving motor in the vibration collection module, the vibration data of the driving motor is collected; Based on a vibration control box in the vibration collection module that is in communication connection with the vibration sensor, and using the vibration data, a vibration waveform is calculated.

[0012] In a possible implementation manner, the harmonic parameter includes waveform data opposite to the vibration waveform.

[0013] In a possible implementation, the electromagnetic noise includes: electromagnetic vibration noise generated by electromagnetic force harmonics of the driving motor body, stator natural frequency, or rotor eccentricity.

[0014] In a possible implementation, the active vibration reduction method for a variable frequency drive motor further includes: Based on the variable frequency drive control module, when the drive motor is controlled to start, the drive motor is controlled to operate under a silent condition.

[0015] The beneficial effects of adopting the above implementation method are: the active vibration reduction system and method of the variable frequency drive motor provided by the present invention, the active vibration reduction system includes: a vibration acquisition module, which is used to collect vibration data when the drive motor is running, and calculate the vibration waveform based on the vibration data; the vibration data includes the vibration frequency and speed of the drive motor; a harmonic calculation output module, which is connected to the vibration acquisition module in communication, and is used to calculate the harmonic parameters based on the vibration waveform; a variable frequency drive control module, which is connected to the harmonic calculation output module in communication, and is used to perform active harmonic injection on the drive motor based on the harmonic parameters to reduce the electromagnetic noise of the drive motor. Different from manually adjusting the output of the variable frequency drive control system, the present invention adopts the method of active harmonic injection, controls the output power of the variable frequency drive control module by actively calculating the harmonic parameters, offsets the electromagnetic noise generated during the operation of the drive motor, realizes active harmonic injection noise reduction, solves the technical problem that the existing solution cannot accurately reduce or eliminate the electromagnetic noise generated by the harmonics of the frequency converter, and is suitable for the field of high-precision equipment using permanent magnet synchronous motors. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0017] Figure 1 A schematic structural diagram of an embodiment of an active vibration reduction system for a variable frequency drive motor provided by the present invention; Figure 2 The present invention is a flow chart of an embodiment of the active vibration reduction method for a variable frequency drive motor provided by the present invention. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0019] In the description of the embodiments of the present application, unless otherwise specified, “plurality” means two or more than two.

[0020] The terms "including" and "having" and any variations thereof in the embodiments of the present invention are intended to cover non-exclusive inclusions. For example, a process, method, apparatus, product or equipment comprising a series of steps or modules is not necessarily limited to those steps or modules clearly listed, but may include other steps or modules not clearly listed or inherent to these processes, methods, products or equipment.

[0021] The naming or numbering of the steps in the embodiments of the present invention does not mean that the steps in the method flow must be executed in the time / logical sequence indicated by the naming or numbering. The execution order of the named or numbered process steps can be changed according to the technical purpose to be achieved, as long as the same or similar technical effects can be achieved.

[0022] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0023] The present invention provides an active vibration reduction system and method for a variable frequency drive motor, which are described below.

[0024] like Figure 1 As shown, the present invention provides an active vibration reduction system for a variable frequency drive motor, comprising: The vibration collection module 101 is used to collect vibration data of the drive motor 104 when it is running, and calculate the vibration waveform based on the vibration data; the vibration data includes the vibration frequency and rotation speed of the drive motor 104; the drive motor 104 can be a permanent magnet synchronous motor; A harmonic calculation output module 102 is connected to the vibration acquisition module 101 for calculating harmonic parameters based on the vibration waveform; The variable frequency drive control module 103 is in communication with the harmonic calculation output module 102 and is used to perform active harmonic injection into the drive motor 104 based on the harmonic parameters to reduce the electromagnetic noise of the drive motor 104 .

[0025] It is understandable that the permanent magnet synchronous motor is mainly composed of components such as the stator, rotor and end cover. The stator is made of laminated sheets to reduce the iron loss generated when the motor is running, and is equipped with a three-phase AC winding, called an armature. The rotor can be made into a solid form or pressed from laminated sheets, on which permanent magnet materials are installed. Depending on the position of the permanent magnet material on the motor rotor, the permanent magnet synchronous motor can be divided into two structural forms: protruding type and built-in type. The protruding rotor has a simple magnetic circuit structure and low manufacturing cost, but since the starting winding cannot be installed on its surface, asynchronous starting cannot be achieved.

[0026] There are three main types of magnetic circuit structures for built-in rotors: radial, tangential and hybrid. The difference between them lies mainly in the relationship between the magnetization direction of the permanent magnet and the rotation direction of the rotor. Figure 2 Three different forms of built-in rotor magnetic circuit structures are given. Since the permanent magnet is placed inside the rotor, the rotor surface can be made into pole shoes. Copper bars or cast aluminum are placed inside the pole shoes to play a role in starting and damping, and both steady-state and dynamic performance are good. Since the built-in rotor magnetic circuit is asymmetric, it will generate magnetic resistance torque during operation, which helps to improve the power density and overload capacity of the motor itself, and such a structure is easier to achieve weak magnetic speed expansion.

[0027] The purpose of the present invention is to provide an active vibration reduction method for a variable frequency drive motor 104, which utilizes the electromagnetic noise mechanism of a synchronous motor and the principle of sound wave superposition, and uses the feedback mechanism of a variable frequency drive control module 103 and a vibration collection module 101 to achieve vibration noise of the drive motor 104.

[0028] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention to solve its technical problem is: to provide an active vibration reduction system for a variable frequency drive motor 104, an output device based on active harmonic injection, and also includes a drive motor 104 in a fixed frequency working state under a silent working condition, a variable frequency drive control module 103, a vibration collection module 101 composed of a vibration sensor 1011 and a control box, and a vibration data controller (harmonic calculation output module 102) connected to the vibration collection module 101. The present invention uses the method of harmonic injection to control the variable frequency drive control module 103 to output a specified harmonic, offset the electromagnetic vibration noise generated by the electromagnetic force harmonics of the motor body, the natural frequency of the stator or the eccentricity of the rotor, and realize active vibration reduction of the variable frequency drive motor 104.

[0029] The beneficial effects of the present invention are: different from manually adjusting the output of the variable frequency drive control module 103, the present invention adopts an active harmonic injection method to control the inverter output power by actively calculating harmonic parameters, thereby achieving active harmonic injection noise reduction, solving the electromagnetic noise problem of the drive motor 104, and is suitable for the field of high-precision equipment using the drive motor 104.

[0030] The present invention uses harmonic injection to control the variable frequency drive control module 103 to output specified harmonics to offset the electromagnetic vibration noise generated by the electromagnetic force harmonics of the motor body, the stator natural frequency or the rotor eccentricity, thereby achieving active vibration reduction of the variable frequency drive motor 104.

[0031] In some embodiments, the vibration collection module 101 includes: A vibration sensor 1011 is fixed on the drive motor 104 and is used to collect vibration data of the drive motor 104; The vibration control box 1012 is in communication with the vibration sensor 1011 and is used to calculate a vibration waveform based on the vibration data.

[0032] It is understandable that in the field of engineering vibration testing, there are various testing means and methods, but according to the measurement methods of various parameters and the physical properties of the measurement process, vibration sensors can be divided into three categories: mechanical vibration sensors, optical vibration sensors, and electrical vibration sensors.

[0033] Mechanical vibration sensor: The parameters of engineering vibration are converted into mechanical signals, which are then amplified by the mechanical system for measurement and recording. Commonly used instruments include lever-type vibrometers and Geiger vibrometers, which can measure lower frequencies and have lower accuracy. However, they are simpler and more convenient for on-site testing.

[0034] Optical vibration sensor: The parameters of engineering vibration are converted into optical signals, which are displayed and recorded after being amplified by the optical system. Such as reading microscopes and laser vibrometers.

[0035] Electrical vibration sensor: The parameters of engineering vibration are converted into electrical signals, which are then displayed and recorded after being amplified by electronic circuits. The key point of the electrical measurement method is to first convert the mechanical vibration into electrical quantities (electromotive force, charge and other electrical quantities), and then measure the electrical quantities to obtain the mechanical quantities to be measured. This is the most widely used measurement method at present.

[0036] Although the physical properties of the three measurement methods mentioned above are different, the measurement systems they constitute are basically the same. They all include three links: vibration pickup, measurement amplification circuit, and display and recording.

[0037] 1. Vibration pickup: The device that converts the measured mechanical vibration into mechanical, optical or electrical signals is called a sensor.

[0038] 2. Measurement circuit. There are many types of measurement circuits, all of which are designed for the conversion principles of various sensors. For example, the measurement circuits specially matched with piezoelectric sensors include voltage amplifiers, charge amplifiers, etc. In addition, there are integration circuits, differential circuits, filter circuits, normalization devices, etc.

[0039] 3. Signal analysis, display and recording. The voltage signal output from the measurement circuit can be input into the signal analyzer or transmitted to the display instrument (such as electronic voltmeter, oscilloscope, phase meter, etc.), recording equipment (such as optical oscilloscope, tape recorder, X-Y recorder, etc.) according to the measurement requirements. It can also be recorded on a tape when necessary, and then input into the signal analyzer for various analysis and processing to obtain the final result.

[0040] In some embodiments, the harmonic parameters include waveform data that is the inverse of the vibration waveform.

[0041] It can be understood that by generating a waveform opposite to the vibration waveform, the waveform in the electromagnetic noise can be offset, thereby achieving the purpose of offsetting the electromagnetic noise.

[0042] In some embodiments, the electromagnetic noise includes: electromagnetic vibration noise generated by the electromagnetic force harmonics of the drive motor 104, the stator natural frequency, or the rotor eccentricity.

[0043] In some embodiments, the variable frequency drive control module 103 is also used to control the drive motor 104 to operate under a silent condition when controlling the drive motor 104 to start.

[0044] The present invention also provides an active vibration reduction method for a variable frequency drive motor 104, the method being applied to the active vibration reduction system of the variable frequency drive motor 104, such as Figure 2 As shown, the method comprises: S201, collecting vibration data of the driving motor 104 when it is running based on the vibration collection module 101, and calculating a vibration waveform based on the vibration data; the vibration data includes the vibration frequency and rotation speed of the driving motor 104; S202, based on the harmonic calculation output module 102, and using the vibration waveform, calculate and obtain harmonic parameters; S203 , based on the variable frequency drive control module 103 and in combination with the harmonic parameters, active harmonic injection is performed on the drive motor 104 to reduce the electromagnetic noise of the drive motor 104 .

[0045] It can be understood that, unlike manually adjusting the output of the variable frequency drive control system, the present invention adopts an active harmonic injection method to control the output power of the variable frequency drive control module by actively calculating the harmonic parameters, offsetting the electromagnetic noise generated during the operation of the drive motor, and realizing active harmonic injection noise reduction. It solves the technical problem that the existing solutions cannot accurately reduce or eliminate the electromagnetic noise generated by the harmonics of the frequency converter, and is suitable for the field of high-precision equipment using permanent magnet synchronous motors.

[0046] In some embodiments, the vibration data of the driving motor 104 during operation is collected based on the vibration collection module 101, and a vibration waveform is calculated based on the vibration data, including: Based on the vibration sensor 1011 fixed on the driving motor 104 in the vibration collection module 101, the vibration data of the driving motor 104 is collected; Based on the vibration control box 1012 in the vibration collection module 101 that is in communication connection with the vibration sensor 1011 and using the vibration data, a vibration waveform is calculated.

[0047] In some embodiments, the harmonic parameters include waveform data that is the inverse of the vibration waveform.

[0048] It can be understood that by generating a waveform opposite to the vibration waveform, the waveform in the electromagnetic noise can be offset, thereby achieving the purpose of offsetting the electromagnetic noise.

[0049] In some embodiments, the electromagnetic noise includes: electromagnetic vibration noise generated by the electromagnetic force harmonics of the drive motor 104, the stator natural frequency, or the rotor eccentricity.

[0050] In some embodiments, the active vibration reduction method of the variable frequency drive motor 104 further includes: Based on the variable frequency drive control module 103 , when the drive motor 104 is controlled to start, the drive motor 104 is controlled to work under a silent condition.

[0051] In some embodiments, the specific steps of the active vibration reduction method of the variable frequency drive motor 104 include: when the permanent magnet synchronous motor starts, the variable frequency drive control module 103 receives the superior instruction to start the permanent magnet synchronous motor, and the permanent magnet synchronous motor is in a silent working condition (~170kW@47rpm); when the permanent magnet synchronous motor is running, the vibration sensor 1011 in the vibration acquisition module 101 collects vibration data and uploads it to the vibration control box 1012, the vibration control box 1012 calculates the vibration waveform and sends the vibration waveform to the harmonic calculation output module 102, the harmonic calculation output module 102 transmits the calculated harmonic parameters to the variable frequency drive control module 103, and the variable frequency drive control module 103 implements active vibration reduction.

[0052] Active noise reduction can eliminate electromagnetic noise in a targeted and precise manner by filtering noise harmonics, thus controlling the noise source. Active vibration reduction is widely used in vibration and noise control fields such as electric vehicles, high-precision manufacturing equipment, aerospace, and high-performance ships.

[0053] The active vibration reduction system and method of the variable frequency drive motor 104 provided by the present invention are introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

Claims

1. An active vibration reduction system for a variable frequency drive motor, characterized in that: include: A vibration collection module, used to collect vibration data of the driving motor when it is running, and calculate a vibration waveform based on the vibration data; the vibration data includes the vibration frequency and rotation speed of the driving motor; A harmonic calculation output module, which is in communication with the vibration acquisition module and is used to calculate harmonic parameters based on the vibration waveform; The variable frequency drive control module is communicatively connected with the harmonic calculation output module and is used for actively injecting harmonics into the drive motor based on the harmonic parameters to reduce the electromagnetic noise of the drive motor.

2. The active vibration reduction system of the variable frequency drive motor according to claim 1, characterized in that: The vibration collection module comprises: A vibration sensor is fixed on the drive motor and is used to collect vibration data of the drive motor; The vibration control box is connected to the vibration sensor for calculating the vibration waveform based on the vibration data.

3. The active vibration reduction system of the variable frequency drive motor according to claim 1, characterized in that: The harmonic parameters include waveform data that is the inverse of the vibration waveform.

4. The active vibration reduction system of the variable frequency drive motor according to claim 1, characterized in that: The electromagnetic noise includes: electromagnetic vibration noise generated by electromagnetic force harmonics of the driving motor body, stator natural frequency or rotor eccentricity.

5. The active vibration reduction system of the variable frequency drive motor according to any one of claims 1 to 4, characterized in that: The variable frequency drive control module is also used to control the drive motor to operate under a silent condition when controlling the drive motor to start.

6. An active vibration reduction method for a variable frequency drive motor, characterized in that: The method is applied to the active vibration reduction system of the variable frequency drive motor according to claim 1, and the method comprises: The vibration data of the driving motor when it is running is collected based on the vibration collection module, and the vibration waveform is calculated based on the vibration data; the vibration data includes the vibration frequency and rotation speed of the driving motor; Based on the harmonic calculation output module, and using the vibration waveform, the harmonic parameters are calculated; Based on the variable frequency drive control module, the harmonic parameters are combined to perform active harmonic injection on the drive motor to reduce the electromagnetic noise of the drive motor.

7. The active vibration reduction method for a variable frequency drive motor according to claim 6, characterized in that: The vibration data of the driving motor when it is running is collected based on the vibration collection module, and the vibration waveform is calculated based on the vibration data, including: Based on the vibration sensor fixed on the driving motor in the vibration collection module, the vibration data of the driving motor is collected; Based on a vibration control box in the vibration collection module that is in communication connection with the vibration sensor, and using the vibration data, a vibration waveform is calculated.

8. The active vibration reduction method for a variable frequency drive motor according to claim 6, characterized in that: The harmonic parameters include waveform data that is the inverse of the vibration waveform.

9. The active vibration reduction method for a variable frequency drive motor according to claim 6, characterized in that: The electromagnetic noise includes: electromagnetic vibration noise generated by electromagnetic force harmonics of the driving motor body, stator natural frequency or rotor eccentricity.

10. The active vibration reduction method of a variable frequency drive motor according to any one of claims 6 to 9, characterized in that: Also includes: Based on the variable frequency drive control module, when the drive motor is controlled to start, the drive motor is controlled to operate under a silent condition.

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