An adaptive active electromagnetic vibration reduction method and system for gear transmission

Abstract

An adaptive active electromagnetic vibration reduction method and system for gear transmission. Relates to a vibration suppression method and system. The purpose is to overcome the problems of the existing vibration reduction device, such as the complex structure, limited controllable characteristic vibration line spectrum, and inability to control shaft vibration. The method steps are as follows: decomposing the first vibration signal into vibration harmonic components, and then calculating the first amplitude and first phase of the vibration harmonic components; generating a preset excitation force; collecting the second vibration signal; decomposing the second vibration signal into vibration harmonic components, and then calculating the second amplitude and second phase of the vibration harmonic components; calculating the vibration influence coefficient; calculating the actual excitation force through the vibration influence coefficient; generating a vibration reduction excitation current corresponding to the actual excitation force; generating a reverse excitation force based on the vibration reduction excitation current, and applying the reverse excitation force to the gear shaft of the gear transmission system to reduce the vibration of the gear transmission system.

Description

Technical Field

[0001] The present invention relates to a vibration suppression method and system. Background Art

[0002] Gear transmission systems are key components of power systems and are widely used in engineering. With the development and in-depth research of gear transmission technology, the vibration and noise problems caused by gear transmission have become a major factor restricting the performance of engineering equipment. Active vibration reduction is an effective means of reducing vibration and noise. Existing active vibration reduction devices are mainly divided into two types: arranging the active actuator at the gearbox base and arranging the active actuator at the gear web. Although the arrangement of the active actuator at the gearbox base can reduce the vibration transmitted to the mounting base, it cannot control the shaft vibration, and the device is generally complex and large in structure. The arrangement of the active actuator at the gear web can reduce the gear meshing frequency vibration, but because it is installed on a rotating component, the structural reliability is low and the controllable characteristic vibration line spectrum is limited. Summary of the Invention

[0003] The purpose of the present invention is to overcome the problems of the existing vibration reduction device, such as complex structure, limited controllable characteristic vibration line spectrum and inability to control shaft vibration, and to provide an adaptive active electromagnetic vibration reduction method and system for gear transmission.

[0004] The present invention provides an adaptive active electromagnetic vibration reduction method for gear transmission, the steps are as follows:

[0005] Step 1: collecting a first vibration signal of the gear transmission system;

[0006] Step 2: converting the first vibration signal from the time domain to the frequency domain, decomposing it into vibration harmonic components, and then calculating a first amplitude and a first phase of the vibration harmonic components;

[0007] Step 3: generating a preset excitation force according to a preset excitation current;

[0008] Step 4: After applying a preset excitation force to the gear shaft of the gear transmission system, a second vibration signal of the gear transmission system is collected;

[0009] Step 5: converting the second vibration signal from the time domain to the frequency domain, decomposing it into vibration harmonic components, and then calculating a second amplitude and a second phase of the vibration harmonic components;

[0010] Step 6: Calculate the vibration influence coefficient using the first amplitude and first phase of the vibration harmonic component, the preset excitation force, and the second amplitude and second phase of the vibration harmonic component;

[0011] Step 7: Calculate the actual excitation force by using the preset excitation force and vibration influence coefficient;

[0012] Step 8: Generate a vibration reduction excitation current corresponding to the actual excitation force according to the parameters of the reverse excitation force corresponding to the actual excitation force;

[0013] The parameters of the reverse excitation force include an excitation force amplitude and an excitation force phase, and the excitation force amplitude of the reverse excitation force is equal to the excitation force amplitude of the actual excitation force, and the phase of the reverse excitation force is opposite to the phase of the actual excitation force;

[0014] Step 9: Generate a reverse excitation force according to the vibration reduction excitation current, and apply the reverse excitation force to the gear shaft of the gear transmission system to reduce vibration of the gear transmission system.

[0015] The present invention also provides an adaptive active electromagnetic vibration reduction system for gear transmission, comprising a stator excitation coil, a rotor magnet, a vibration collection device, a signal processing device and an excitation signal generating device;

[0016] The rotor magnet is coaxially fixed to the gear shaft of the gear transmission system;

[0017] The stator excitation coil is coaxially sleeved on the outside of the rotor magnet, and the stator excitation coil is fixed to the housing of the gear transmission system;

[0018] a vibration collecting device for collecting a first vibration signal of the gear transmission system;

[0019] a signal processing device for converting the first vibration signal from the time domain to the frequency domain, decomposing the first vibration signal into vibration harmonic components, and then calculating a first amplitude and a first phase of the vibration harmonic components;

[0020] an excitation signal generating device for sending a preset excitation current to the stator excitation coil;

[0021] The stator excitation coil is used to generate a preset excitation force according to a preset excitation current, and apply the preset excitation force to the gear shaft of the gear transmission system through the rotor magnet;

[0022] The vibration collection device is further used to collect a second vibration signal of the gear transmission system;

[0023] The signal processing device is further used to convert the second vibration signal from the time domain to the frequency domain, decompose it into vibration harmonic components, and then calculate the second amplitude and second phase of the vibration harmonic components;

[0024] The excitation signal generating device is further used to calculate the vibration influence coefficient matrix through the first amplitude and first phase of the vibration harmonic component, the preset excitation force, and the second amplitude and second phase of the vibration harmonic component;

[0025] It is also used to calculate the actual excitation force through the preset excitation force and vibration influence coefficient matrix;

[0026] It is also used to generate a vibration reduction excitation current corresponding to the actual excitation force according to the parameters of the reverse excitation force corresponding to the actual excitation force, and send it to the stator excitation coil;

[0027] The parameters of the reverse excitation force include an excitation force amplitude and an excitation force phase, and the excitation force amplitude of the reverse excitation force is equal to the excitation force amplitude of the actual excitation force, and the phase of the reverse excitation force is opposite to the phase of the actual excitation force;

[0028] The stator excitation coil is also used to generate a reverse excitation force according to the vibration reduction excitation current, and apply the reverse excitation force to the gear shaft of the gear transmission system through the rotor magnet to reduce the vibration of the gear transmission system.

[0029] The beneficial effects of the present invention are:

[0030] The present invention provides an adaptive active electromagnetic vibration reduction method and system for gear transmissions. By adding an electromagnetic drive coil to the gear rotor-bearing system, this method applies a reverse excitation force to the gear rotor, offsetting the dynamic excitation generated by the gear rotor's operation while maintaining the bearing's support for the static load. This method adaptively adjusts the reverse electromagnetic excitation force applied to the gear rotor, reducing vibrations in the gear transmission's characteristic line spectrum, such as rotation, meshing, and harmonics, between the rotating components and the housing. This method effectively suppresses shaft vibration, housing vibration, and vibration transmitted to the machine feet. Its simple, compact structure and ease of installation make it widely applicable to various gear transmission systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the coordination structure of an adaptive active electromagnetic vibration reduction system for gear transmission and a gear transmission system according to the present invention;

[0032] Figure 2 for Figure 1 Schematic diagram of the structure of the stator excitation coil and rotor magnet. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0034] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0035] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention. Specific implementation method 1

[0037] The adaptive active electromagnetic vibration reduction method for gear transmission of this embodiment is characterized by the following steps:

[0038] Step 1: collecting a first vibration signal of the gear transmission system;

[0039] Step 2: converting the first vibration signal from the time domain to the frequency domain, decomposing it into vibration harmonic components, and then calculating a first amplitude and a first phase of the vibration harmonic components;

[0040] Step 3: generating a preset excitation force according to a preset excitation current;

[0041] Step 4: After applying a preset excitation force to the gear shaft of the gear transmission system, a second vibration signal of the gear transmission system is collected;

[0042] Step 5: converting the second vibration signal from the time domain to the frequency domain, decomposing it into vibration harmonic components, and then calculating a second amplitude and a second phase of the vibration harmonic components;

[0043] Step 6: Calculate the vibration influence coefficient using the first amplitude and first phase of the vibration harmonic component and the second amplitude and second phase of the vibration harmonic component;

[0044] Step 7: Calculate the actual excitation force by using the preset excitation force and vibration influence coefficient;

[0045] Step 8: Generate a vibration reduction excitation current corresponding to the actual excitation force according to the parameters of the reverse excitation force corresponding to the actual excitation force;

[0046] The parameters of the reverse excitation force include an excitation force amplitude and an excitation force phase, and the excitation force amplitude of the reverse excitation force is equal to the excitation force amplitude of the actual excitation force, and the phase of the reverse excitation force is opposite to the phase of the actual excitation force;

[0047] Step 9: Generate a reverse excitation force according to the vibration reduction excitation current, and apply the reverse excitation force to the gear shaft of the gear transmission system to reduce vibration of the gear transmission system.

[0048] Specifically, the magnitude and phase of the exciting force required for each order characteristic line spectrum are calculated based on the influence coefficient method. The principle is as follows: first, a set of known preset amplitudes F0 and phases are applied according to the first amplitude A0 and the first phase θ0 of each order vibration characteristic line spectrum in the first vibration signal. The preset excitation force is applied, and then the second amplitude A1 and the second phase θ1 of each order vibration characteristic line spectrum in the second vibration signal after the preset excitation force is applied are measured. According to the first amplitude A0, the first phase θ0 of the first vibration, the amplitude F0 of the preset excitation force, the phase of the preset excitation force The vibration influence coefficient matrix (including the vibration influence coefficients of each order vibration characteristic line spectrum) is calculated by the second amplitude A1 and the second phase θ1 of the second vibration after the change. The actual amplitude F1 and phase of the excitation force are calculated according to the vibration influence coefficient matrix. That is, the actual excitation force, and finally a set of amplitude F1 phase- The reverse excitation force can offset the preset excitation force and achieve the purpose of active vibration reduction.

[0049] The calculation steps of the reverse excitation force are:

[0050] a) Record the amplitude and phase of the initial vibration of the current working condition;

[0051] b) applying a preset excitation force;

[0052] c) recording the vibration amplitude and phase after applying the preset excitation force;

[0053] d) Calculate the vibration influence coefficient matrix;

[0054] e) Calculate the amplitude and phase of the reverse excitation force. After obtaining the amplitude and phase of the reverse excitation force, calculate the amplitude and phase of the electromagnetic force that should be applied by each unit excitation coil in the electromagnetic drive coil and generate the corresponding current excitation signal. Specific implementation method 2

[0056] This embodiment is a further explanation of the first embodiment. In this embodiment, step three specifically includes:

[0057] The speed of the gear transmission system is collected, and when the speed fluctuation is less than or equal to the set speed fluctuation threshold, a preset excitation force is generated according to the preset excitation current.

[0058] The other technical features of this embodiment are exactly the same as those of embodiment 1.

[0059] Specifically, the change of the current gear transmission working condition is judged by analyzing the change of the speed, the amplitude and the phase of the main characteristic line spectrum. When the speed, the amplitude and the phase of the main characteristic line spectrum are basically stable, the calculation step of the reverse excitation force is started. Specific implementation method three

[0061] This embodiment is a further explanation of the second embodiment. In this embodiment,

[0062] The vibration influence coefficient is obtained by the following formula:

[0063]

[0064] in, is the vector corresponding to the first amplitude and first phase of the vibration harmonic component; is the vector corresponding to the second amplitude and second phase of the vibration harmonic component; To preset incentives;

[0065] Actual motivation Obtained by the following formula:

[0066]

[0067] The other technical features of this embodiment are exactly the same as those of the second embodiment. Specific implementation method four

[0069] An adaptive active electromagnetic vibration reduction system for gear transmission in this embodiment includes a stator excitation coil 1, a rotor magnet 2, a vibration collection device 3, a signal processing device 4 and an excitation signal generating device 5;

[0070] The rotor magnet 2 is coaxially fixed on the gear shaft of the gear transmission system;

[0071] The stator excitation coil 1 is coaxially sleeved on the outside of the rotor magnet 2, and the stator excitation coil 1 is fixed to the housing of the gear transmission system;

[0072] A vibration collecting device 3, used for collecting a first vibration signal of the gear transmission system;

[0073] A signal processing device 4 is used to convert the first vibration signal from the time domain to the frequency domain, decompose it into vibration harmonic components, and then calculate a first amplitude and a first phase of the vibration harmonic components;

[0074] an excitation signal generating device 5 for sending a preset excitation current to the stator excitation coil 1;

[0075] The stator excitation coil 1 is used to generate a preset excitation force according to a preset excitation current, and apply the preset excitation force to the gear shaft of the gear transmission system through the rotor magnet 2;

[0076] The vibration collecting device 3 is also used to collect a second vibration signal of the gear transmission system;

[0077] The signal processing device 4 is further used to convert the second vibration signal from the time domain to the frequency domain, decompose it into vibration harmonic components, and then calculate the second amplitude and second phase of the vibration harmonic components;

[0078] The excitation signal generating device 5 is further configured to calculate a vibration influence coefficient matrix using the first amplitude and the first phase of the vibration harmonic component and the second amplitude and the second phase of the vibration harmonic component;

[0079] It is also used to calculate the actual excitation force through the preset excitation force and vibration influence coefficient matrix;

[0080] It is also used to generate a vibration reduction excitation current corresponding to the actual excitation force according to the parameters of the reverse excitation force corresponding to the actual excitation force, and send it to the stator excitation coil 1;

[0081] The parameters of the reverse excitation force include an excitation force amplitude and an excitation force phase, and the excitation force amplitude of the reverse excitation force is equal to the excitation force amplitude of the actual excitation force, and the phase of the reverse excitation force is opposite to the phase of the actual excitation force;

[0082] The stator excitation coil 1 is also used to generate a reverse excitation force according to the vibration reduction excitation current, and apply the reverse excitation force to the gear shaft of the gear transmission system through the rotor magnet 2 to reduce the vibration of the gear transmission system.

[0083] Specifically, an adaptive active electromagnetic vibration reduction device for gear transmission, as shown in the attached Figure 1 As shown, the device primarily comprises an electromagnetic drive coil (stator excitation coil 1 and rotor magnet 2), a vibration and speed signal acquisition device, and an excitation signal generation device 5. The electromagnetic drive coil and support bearing 11 are mounted together on the gear bearing seat. The electromagnetic drive coil is annularly sleeved around the outside of the gear shaft and secured to the gear transmission housing near the support bearing. Two gear shafts 9 each hold a transmission gear 12, and the two transmission gears 12 mesh with each other.

[0084] The vibration and speed signal acquisition device includes a vibration acquisition device 3, a speed acquisition device 6, and a signal processing device 4. The acquisition devices (vibration acquisition device 3 and speed acquisition device 6) are used to measure vibration displacement, vibration velocity, vibration acceleration, and speed / phase. Eddy current displacement sensors or acceleration sensors are selected based on the gearbox characteristics and the acquisition device installation conditions. Signal processing device 4 processes the signal from vibration acquisition device 3, decomposing the time history waveform into several single harmonic components through Fourier transform, thereby obtaining the signal's frequency structure and the amplitude and phase information of each harmonic.

[0085] The excitation signal generating device 5 receives the real-time speed information and the amplitude and phase information of the characteristic line spectrum provided by the vibration and speed signal collecting device, and starts to actively execute the step of calculating the reverse excitation force.

[0086] The host computer and the excitation signal generating device 5 communicate with each other through the network cable, and simultaneously receive data and signals from the vibration and speed signal acquisition device and the excitation signal generating device 5, so as to realize real-time monitoring of vibration and speed status and control of the excitation signal generating device 5. Specific implementation method five

[0088] This embodiment is a further explanation of the fourth embodiment. In this embodiment, a rotation speed acquisition device 6 is further included.

[0089] Speed ​​acquisition device 6, used to acquire the speed of the gear transmission system;

[0090] The excitation signal generating device 5 is further configured to generate a preset excitation force according to a preset excitation current when the fluctuation of the rotational speed is less than or equal to a set rotational speed fluctuation threshold.

[0091] The other technical features of this embodiment are exactly the same as those of embodiment 4.

[0092] Specifically, the excitation signal generating device 5 receives the real-time speed information and the amplitude and phase information of the characteristic line spectrum provided by the vibration and speed signal acquisition device, and judges the changes in the current gear transmission working condition by analyzing the changes in the speed, the amplitude and phase of the main characteristic line spectrum. When the speed, the amplitude and phase of the main characteristic line spectrum are basically stable, the excitation signal generating device 5 starts to actively execute the calculation step of the reverse excitation force. Specific implementation method six

[0094] This embodiment is a further explanation of the fifth embodiment. In this embodiment, the vibration influence coefficient is obtained by the following formula:

[0095]

[0096] in, is the vector corresponding to the first amplitude and first phase of the vibration harmonic component; is the vector corresponding to the second amplitude and second phase of the vibration harmonic component; To preset incentives;

[0097] Actual motivation Obtained by the following formula:

[0098]

[0099] The other technical features of this embodiment are exactly the same as those of embodiment five. Specific embodiment seven

[0101] This embodiment is a further explanation of the sixth embodiment. In this embodiment, the stator excitation coil 1 includes four groups of parallel sub-excitation coils, and the four groups of sub-excitation coils are evenly distributed around the outer circumference of the rotor magnetic steel 2.

[0102] Each group of sub-excitation coils includes three electromagnet blocks wound by a wire, and the polarities of the three electromagnet blocks facing the rotor magnet 2 are S pole, N pole and S pole respectively.

[0103] The other technical features of this embodiment are exactly the same as those of embodiment six.

[0104] Specifically, the electromagnetic drive coil structure is as shown in the attached Figure 2As shown, it is composed of a rotor magnet and a stator excitation coil. The electromagnetic drive coil is divided into 12 magnetic poles, which together with the rotor magnet form 8 magnetic circuits. The excitation current generates an alternating magnetic field after passing through the stator excitation coil, thereby generating a force to suppress vibration. The stator excitation coil is composed of four groups of unit excitation coils in parallel. The four groups of unit excitation coils are arranged in a circular ring on the outer surface of the rotor magnet. Each group of unit excitation coils includes three arc-shaped electromagnet blocks and a wire wound around the three arc-shaped electromagnet blocks. The twelve arc-shaped electromagnet blocks in the four groups of unit excitation coils are respectively defined as arc-shaped electromagnet blocks. The polarity of the three arc-shaped electromagnet blocks in each group of unit excitation coils and the contact end of the rotor magnet are SNS to ensure that the relative direction magnetic poles are the same and both generate suction; the excitation current (preset excitation current and vibration reduction excitation current) in the four wires of the four groups of unit excitation coils is controlled by the excitation signal generating device 5 and the signal amplifying device 7 to adjust the radial force of the rotor magnet. Specific embodiment eight

[0106] This embodiment is a further explanation of the seventh embodiment. In this embodiment, a signal amplifying device 7 is further included.

[0107] The signal amplifying device 7 is used to receive the excitation signal generated by the excitation signal generating device 5 , generate the corresponding amplitude of the vibration reduction excitation current, and then input it into the stator excitation coil 1 .

[0108] The other technical features of this embodiment are exactly the same as those of embodiment seven.

[0109] Specifically, the signal amplifying device 7 amplifies the power of the current excitation signal emitted by the excitation signal generating device 5 to drive the electromagnetic coil to generate force. The driving signal amplifying device 7 adopts an H-bridge drive form and is mainly composed of a power management circuit, a microprocessor, a temperature and current signal acquisition circuit, and a communication circuit. The power management circuit is used to adjust the input power supply to the power supply of the chip on the driving board; the microprocessor is used to control the driving chip and the acquisition of temperature, current and other signals; the communication circuit is used to communicate with an external controller to realize information exchange. The signal amplifying device 7 has control functions such as output voltage range, output current range, control mode (current control, voltage control), load range, etc., to meet the high-power drive output requirements of multiple electromagnetic drive coils. Specific embodiment nine

[0111] This embodiment is a further explanation of the fourth, fifth, sixth, seventh or eighth embodiment. In this embodiment, an elastic damping device 8 is further included.

[0112] The outer side wall of the stator excitation coil 1 is fixed to the housing of the gear transmission system through an elastic damping device 8.

[0113] The other technical features of this embodiment are exactly the same as those of embodiment four, five, six, seven or eight.

[0114] Specifically, an elastic damping device 8 is provided between the outermost layer of the electromagnetic drive coil and the supporting surface of the box body 10 to isolate the electromagnetic drive coil from transmitting the exciting force to the box body 10 .

[0115] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It should be understood that many modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that features described herein may be combined in ways other than those described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be used in other embodiments.

Claims

1. An adaptive active electromagnetic vibration reduction method for gear transmission, characterized in that: The steps are as follows Step 1: collecting a first vibration signal of the gear transmission system; Step 2: converting the first vibration signal from the time domain to the frequency domain, decomposing it into vibration harmonic components, and then calculating a first amplitude and a first phase of the vibration harmonic components; Step 3: generating a preset excitation force according to a preset excitation current; Step 4: After applying the preset excitation force to the gear shaft of the gear transmission system, a second vibration signal of the gear transmission system is collected; Step 5: converting the second vibration signal from the time domain to the frequency domain, decomposing it into vibration harmonic components, and then calculating a second amplitude and a second phase of the vibration harmonic components; Step 6: Calculate the vibration influence coefficient using the first amplitude and first phase of the vibration harmonic component, the preset excitation force, and the second amplitude and second phase of the vibration harmonic component; Step 7: Calculate the actual excitation force by using the preset excitation force and vibration influence coefficient; Step 8: Generate a vibration reduction excitation current corresponding to the actual excitation force according to the parameters of the reverse excitation force corresponding to the actual excitation force; The parameters of the reverse excitation force include an excitation force amplitude and an excitation force phase, and the excitation force amplitude of the reverse excitation force is equal to the excitation force amplitude of the actual excitation force, and the phase of the reverse excitation force is opposite to the phase of the actual excitation force; Step nine: generating a reverse excitation force according to the vibration reduction excitation current, and applying the reverse excitation force to the gear shaft of the gear transmission system to reduce vibration of the gear transmission system.

2. The adaptive active electromagnetic vibration reduction method for gear transmission according to claim 1, characterized in that: Step three specifically includes: The rotational speed of the gear transmission system is collected, and when the fluctuation of the rotational speed is less than or equal to a set rotational speed fluctuation threshold, a preset excitation force is generated according to a preset excitation current.

3. The adaptive active electromagnetic vibration reduction method for gear transmission according to claim 2, characterized in that: The vibration influence coefficient is obtained by the following formula: in, is the vector corresponding to the first amplitude and first phase of the vibration harmonic component; is the vector corresponding to the second amplitude and second phase of the vibration harmonic component; To preset incentives; Actual motivation Obtained by the following formula:

4. An adaptive active electromagnetic vibration reduction system for gear transmission, characterized in that: It comprises a stator excitation coil (1), a rotor magnetic steel (2), a vibration collection device (3), a signal processing device (4) and an excitation signal generating device (5); The rotor magnet (2) is coaxially fixed on the gear shaft of the gear transmission system; The stator excitation coil (1) is coaxially sleeved on the outside of the rotor magnetic steel (2), and the stator excitation coil (1) is fixed to the housing of the gear transmission system; The vibration collecting device (3) is used to collect a first vibration signal of the gear transmission system; The signal processing device (4) is used to convert the first vibration signal from the time domain to the frequency domain, decompose it into vibration harmonic components, and then calculate the first amplitude and first phase of the vibration harmonic components; The excitation signal generating device (5) is used to send a preset excitation current to the stator excitation coil (1); The stator excitation coil (1) is used to generate a preset excitation force according to a preset excitation current, and to apply the preset excitation force to the gear shaft of the gear transmission system through the rotor magnet (2); The vibration collection device (3) is also used to collect a second vibration signal of the gear transmission system; The signal processing device (4) is further used to convert the second vibration signal from the time domain to the frequency domain, decompose it into vibration harmonic components, and then calculate the second amplitude and second phase of the vibration harmonic components; The excitation signal generating device (5) is further used to calculate a vibration influence coefficient matrix through the first amplitude and first phase of the vibration harmonic component and the second amplitude and second phase of the vibration harmonic component; It is also used to calculate the actual excitation force through the preset excitation force and vibration influence coefficient matrix; It is also used to generate a vibration reduction excitation current corresponding to the actual excitation force according to the parameters of the reverse excitation force corresponding to the actual excitation force, and send the current to the stator excitation coil (1); The parameters of the reverse excitation force include an excitation force amplitude and an excitation force phase, and the excitation force amplitude of the reverse excitation force is equal to the excitation force amplitude of the actual excitation force, and the phase of the reverse excitation force is opposite to the phase of the actual excitation force; The stator excitation coil (1) is also used to generate a reverse excitation force according to the vibration reduction excitation current, and to apply the reverse excitation force to the gear shaft of the gear transmission system through the rotor magnetic steel (2), thereby reducing the vibration of the gear transmission system.

5. The adaptive active electromagnetic vibration reduction system for gear transmission according to claim 4, characterized in that: It also includes a rotation speed acquisition device (6); The speed acquisition device (6) is used to acquire the speed of the gear transmission system; The excitation signal generating device (5) is further configured to generate a preset excitation force according to a preset excitation current when the fluctuation of the rotational speed is less than or equal to a set rotational speed fluctuation threshold.

6. The adaptive active electromagnetic vibration reduction system for gear transmission according to claim 5, characterized in that: The vibration influence coefficient is obtained by the following formula: in, is the vector corresponding to the first amplitude and first phase of the vibration harmonic component; is the vector corresponding to the second amplitude and second phase of the vibration harmonic component; To preset incentives; Actual motivation Obtained by the following formula:

7. The adaptive active electromagnetic vibration reduction system for gear transmission according to claim 6, characterized in that: The stator excitation coil (1) comprises four groups of parallel-connected unit excitation coils, and the four groups of unit excitation coils are evenly distributed around the outer circumference of the rotor magnetic steel (2); Each group of unit excitation coils includes three electromagnet blocks wound by a wire, and the polarities of the three electromagnet blocks facing one end of the rotor magnet (2) are S pole, N pole and S pole in sequence.

8. The adaptive active electromagnetic vibration reduction system for gear transmission according to claim 7, characterized in that: Also includes a signal amplification device (7); The signal amplifying device (7) is used to receive the excitation signal generated by the excitation signal generating device (5), generate a corresponding amplitude of the vibration reduction excitation current, and then input it into the stator excitation coil (1).

9. An adaptive active electromagnetic vibration reduction system for gear transmission according to claim 4, 5, 6, 7 or 8, characterized in that: Also includes an elastic damping device (8); The outer side wall of the stator excitation coil (1) is fixed to the housing of the gear transmission system through the elastic damping device (8).

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