Motor control device, method and rotating motor

Abstract

The present application relates to a motor control device, method and rotating motor. The device includes a vibration sensor, a controller and a peak clipping coil. The vibration sensor is arranged on the motor, and the peak clipping coil is arranged on the side of the stator winding away from the rotor of the motor. The vibration sensor and the peak clipping coil are both connected to the controller. The vibration sensor is used to detect the vibration of the motor to generate a vibration signal and transmit it to the controller. The controller is used to generate a pulse signal according to the vibration signal and transmit it to the peak clipping coil. The pulse signal is used to control the peak clipping coil to generate a magnetic field opposite to the harmonic magnetic field generated by the stator winding of the motor. The controller causes the peak clipping coil to generate a magnetic field in the opposite direction to the magnetic field generated by the stator winding according to the vibration of the motor, which can offset the harmonic magnetic field generated by the stator winding, increase the magnetic resistance of the motor yoke, reduce the magnetic density of the motor air gap, have good vibration reduction and noise reduction effects, and can also alleviate the problem of loosening or damage of components caused by motor vibration, thereby improving the working performance of the motor.

Description

Technical Field

[0001] The present application relates to the technical field of electrical equipment, and in particular to a motor control device, method and rotating motor. Background Art

[0002] The main function of the motor is to generate driving torque. As a power source for electrical appliances or various machines, it is widely used. The motor will generate noise when working. The noise is caused by tangential force and radial force. The tangential electromagnetic force generally causes torque fluctuations, which further brings vibration noise, while the radial electromagnetic force causes the stator to vibrate, thereby transmitting vibration to the structure and radiating noise to the air. The higher the motor speed, the more obvious the vibration of the unit will be. In severe cases, it will cause the unit to shake violently, the connectors to loosen, the seals to be damaged, the transmission parts to wear and fail, and affect the normal operation of peripheral equipment, etc., causing great damage to the equipment itself and the surrounding environment.

[0003] The traditional method of reducing motor noise is to design a composite layer structure on the motor casing to absorb the vibration energy of the motor and reduce the motor noise. However, the vibration reduction amplitude of this composite layer structure is small, the noise reduction effect is not obvious, and it cannot alleviate the motor vibration, resulting in poor motor performance. Summary of the invention

[0004] In view of the problem that traditional noise reduction methods have poor noise reduction effects and cannot alleviate motor vibration, resulting in poor motor working performance, the present invention proposes a motor control device, method and rotating motor. The motor control device, method and rotating motor can achieve good vibration and noise reduction effects, alleviate loosening or damage of components caused by motor vibration, and improve the working performance of the motor.

[0005] A motor control device comprises a vibration sensor, a controller and a peak clipping coil, wherein the vibration sensor is arranged on the motor, the peak clipping coil is arranged on a side of the stator winding of the motor away from the rotor of the motor, and the vibration sensor and the peak clipping coil are both connected to the controller;

[0006] The vibration sensor is used to detect the vibration of the motor to generate a vibration signal and transmit it to the controller. The controller is used to generate a pulse signal according to the vibration signal and transmit it to the peak clipping coil. The pulse signal is used to control the peak clipping coil to generate a magnetic field opposite to the harmonic magnetic field generated by the stator winding of the motor.

[0007] A motor control method comprises the following steps:

[0008] Acquire a vibration signal of the motor; the vibration signal is obtained by a vibration sensor detecting the vibration of the motor;

[0009] A pulse signal is generated according to the vibration signal and transmitted to the peak clipping coil; the pulse signal is used to control the peak clipping coil to generate a magnetic field opposite to the harmonic magnetic field generated by the stator winding of the motor, and the peak clipping coil is arranged on the side of the stator winding of the motor away from the rotor of the motor.

[0010] A rotating electric machine comprises a motor and the motor control device as described above.

[0011] The above-mentioned motor control device, method and rotating motor include a vibration sensor, a controller and a peak clipping coil. The vibration sensor is arranged on the motor, and the peak clipping coil is arranged on the side of the stator winding away from the rotor of the motor. The vibration sensor and the peak clipping coil are both connected to the controller. The vibration sensor is used to detect the vibration of the motor to generate a vibration signal and transmit it to the controller. The controller is used to generate a pulse signal according to the vibration signal and transmit it to the peak clipping coil. The pulse signal is used to control the peak clipping coil to generate a magnetic field opposite to the harmonic magnetic field generated by the stator winding of the motor. The controller generates a pulse signal to the peak clipping coil according to the vibration of the motor, so that the peak clipping coil generates a magnetic field in the opposite direction to the magnetic field generated by the stator winding, which can offset the harmonic magnetic field generated by the stator winding, increase the magnetic resistance of the motor yoke, reduce the magnetic density of the motor air gap, and achieve the reduction of air gap force wave vibration. The vibration reduction and noise reduction effect is good, and the problem of loosening or damage of components caused by motor vibration can be alleviated, thereby improving the working performance of the motor.

[0012] In one of the embodiments, the number of the peak shaving coils matches the number of pole pairs of the motor.

[0013] In one embodiment, when the number of the peak shaving coils is more than two, the structures and sizes of the peak shaving coils are matched.

[0014] In one of the embodiments, the cross-sectional dimension of the peak shaving coil matches the cross-sectional dimension of the stator winding.

[0015] In one embodiment, the vibration sensor is an acceleration sensor or a displacement sensor.

[0016] In one of the embodiments, the motor includes a stator core, a through slot penetrating two end surfaces of the stator core is formed on the periphery of the stator core, and the peak clipping coil is arranged in the through slot.

[0017] In one of the embodiments, the motor includes a stator core, a through hole penetrating two end surfaces of the stator core is formed inside the stator core, and the peak clipping coil is arranged in the through hole.

[0018] In one embodiment, the vibration sensor is disposed on a foot of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a structural block diagram of a motor control device in one embodiment;

[0020] Figure 2 is a working flow chart of a motor control device in one embodiment;

[0021] Figure 3 is a cross-sectional view of a stator core region in one embodiment;

[0022] Figure 4 is a cross-sectional view of a motor with a housing in one embodiment;

[0023] Figure 5 FIG. 4 is a flow chart of a motor control method in one embodiment. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is described more comprehensively below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] In one embodiment, see Figure 1 , a motor control device is provided, including a vibration sensor 200, a controller 100 and a peak clipping coil 300, wherein the vibration sensor 200 is arranged on the motor, the peak clipping coil 300 is arranged on the side of the stator winding 1 away from the rotor 4 of the motor, and the vibration sensor 200 and the peak clipping coil 300 are both connected to the controller 100. The vibration sensor 200 is used to detect the vibration of the motor to generate a vibration signal and transmit it to the controller 100, and the controller 100 is used to generate a pulse signal according to the vibration signal and transmit it to the peak clipping coil 300, and the pulse signal is used to control the peak clipping coil 300 to generate a magnetic field opposite to the harmonic magnetic field generated by the stator winding 1 of the motor. The controller 100 generates a pulse signal to the peak clipping coil 300 according to the vibration of the motor, so that the peak clipping coil 300 generates a magnetic field in the opposite direction to the magnetic field generated by the stator winding 1, which can offset the harmonic magnetic field generated by the stator winding 1, increase the magnetic resistance of the motor yoke 3, and reduce the magnetic density of the motor air gap, thereby reducing the air gap force wave vibration, achieving good vibration reduction and noise reduction effects, and can also alleviate the problem of loose or damaged components caused by motor vibration, thereby improving the working performance of the motor.

[0026] Specifically, the motor air gap refers to the gap between the stator and the rotor 4 of the motor, and the motor yoke 3 refers to the area in the stator core of the motor where the stator winding 1 is not set. The vibration sensor 200 is mainly used to detect the vibration of the motor to generate a vibration signal and transmit it to the controller 100. The position where the vibration sensor 200 is set is not unique, as long as the vibration of the motor can be detected, it can be selected according to the actual needs of the user. For example, if the vibration of the base needs to be detected, the vibration sensor 200 is set at the base, and if the vibration of the end cover needs to be detected, the vibration sensor 200 is set at the end cover. The vibration sensor 200 can also be set at other positions as needed. Further, the number of vibration sensors 200 is not unique, for example, it can be more than two, and each vibration sensor 200 can be set at different positions of the motor to detect the vibration at different positions of the motor, so as to better realize the monitoring of the vibration of the motor. The type of vibration sensor 200 is not unique, as long as the vibration of the motor can be detected. For example, the vibration sensor 200 can be an acceleration sensor, which can detect the change of vibration speed within a certain period of time, thereby obtaining a vibration signal. The vibration sensor 200 may also be a velocity sensor, which can detect the vibration velocity at different times to obtain a vibration signal. It is understood that in other embodiments, the vibration sensor 200 may also be of other types, and may also include more than two different types at the same time, which can be selected according to actual needs, as long as those skilled in the art believe that it can be implemented.

[0027] The types of vibration signals are not unique, and generally can include vibration frequency and vibration amplitude. The vibration frequency can characterize the speed of the motor vibration, and the vibration amplitude can characterize the degree of the motor vibration. When the vibration signal includes the vibration frequency and the vibration amplitude, the vibration signal can reflect the characteristics of the motor vibration, so that the subsequent processing of the motor vibration has better pertinence. It can be understood that the vibration signal referred to in this embodiment can be either the vibration frequency or the vibration amplitude that directly reflects the vibration characteristics, or it can be a voltage signal obtained after conversion according to the vibration signal.

[0028] The controller 100 is a control board that integrates functions such as signal reception, amplification, processing, and conversion. It can be set inside the motor junction box to facilitate the connection of various signal lines and power lines. The motor junction box can also provide certain protection for the controller 100. The controller 100 is responsible for generating a pulse signal according to the vibration signal after receiving the vibration signal and transmitting it to the peak clipping coil 300. The characteristics of the pulse signal generated by the controller 100 are determined according to the characteristics of the received vibration signal. When the vibration signal includes a vibration amplitude, the controller 100 adjusts the amplitude of the pulse signal according to the amplitude of the vibration signal to adjust the degree of magnetic field offset. When the vibration signal includes a vibration frequency, the controller 100 adjusts the duty cycle of the pulse signal according to the frequency of the vibration signal so that the pulse signal can better correspond to offset the magnetic field generated by the stator winding. The vibration signal can also include the vibration frequency and the vibration amplitude at the same time. When the vibration frequency is 100Hz, the controller 100 can generate a pulse signal with a frequency of 100Hz and transmit it to the peak clipping coil 300. The amplitude of the pulse signal can be adjusted according to the attenuation of the vibration amplitude. For example, when the vibration amplitude is 130dB, if the amplitude of every 100dB is set to correspond to 10V, then if the vibration amplitude is not attenuated, the amplitude of the pulse signal is increased to 20V. If the vibration amplitude is attenuated, the amplitude of the pulse signal can be reduced to 5V until the vibration of the motor meets the requirements. Furthermore, the controller 100 can obtain the corresponding voltage signal according to the received vibration signal, compare the voltage value corresponding to the voltage signal with the preset voltage value, and send the pulse signal to the peak clipping coil 300 only when the voltage value is below the set value, so as to realize the on-demand start of the peak clipping coil 300 and improve the work efficiency.

[0029] After receiving the pulse signal, the peak clipping coil 300 can generate a magnetic field opposite to the harmonic magnetic field generated by the stator winding 1. The stator winding 1 rotates according to the timing of the three-phase electricity. The controller 100 can determine the position of the rotating magnetic field according to the timing of the three-phase electricity, and send a corresponding pulse signal according to the position of the magnetic field generated by the stator winding 1. It can also increase the detection voltage value of devices such as Hall sensors, and send a corresponding pulse signal to the peak clipping coil 300 according to the detected voltage value. After receiving the pulse signal, the peak clipping coil 300 can generate a magnetic field opposite to the magnetic field generated by the stator winding 1, or generate a magnetic field that is opposite to the magnetic field generated by the stator winding 1 and matches the magnetic field amplitude generated by the stator winding 1, thereby offsetting the harmonic magnetic field generated by the stator winding 1, increasing the magnetic resistance of the motor yoke 3, reducing the magnetic density of the motor air gap, achieving the reduction of air gap force wave vibration, and having a good vibration reduction and noise reduction effect. It can also alleviate the problem of loose or damaged components caused by motor vibration, and improve the working performance of the motor.

[0030] The peak clipping coil 300 is arranged on the side of the stator winding 1 away from the rotor 4 of the motor, and can be specifically arranged on the stator core, and the stator core can also have a certain fixing effect on the peak clipping coil 300. The stator winding 1 is arranged on the inner side of the stator core, close to the rotor 4, and the peak clipping coil 300 is arranged on the side of the stator winding 1 away from the rotor 4 of the motor, which can be arranged inside the stator core or outside the stator core, and can be adjusted according to actual needs. Generally speaking, the peak clipping coil 300 is directly opposite to the geometric center line of each pole coil of the motor winding, and the effect of offsetting the magnetic field is better. In an extensible manner, the peak clipping coil 300 is similar to the structure of the motor winding coil, which is convenient for controlling the size of the magnetic field generated by the peak clipping coil 300. The peak clipping coil 300 has a different span from the motor winding coil. According to the structural requirements, the type of the peak clipping coil 300 can be the same or similar to the type of the motor winding, so as to better maintain the consistency of the motor structure and improve the working performance of the motor.

[0031] In one embodiment, the number of the peak clipping coils 300 matches the number of pole pairs of the motor. Specifically, each set of coils of the three-phase AC motor will generate N and S magnetic poles, and the number of magnetic poles contained in each phase of each motor is the number of poles. For example, when there is only one coil in each phase winding of the three-phase A, B, and C, which is evenly and symmetrically distributed on the circumference, the current changes once and the rotating magnetic field rotates one circle, which is a pair of poles. If each phase of the three-phase winding A, B, and C is composed of two coils in series, and the span of each coil is 1 / 4 of the circumference, then the synthetic magnetic field established by the three-phase current is still a rotating magnetic field, and the current changes once, and the rotating magnetic field only rotates 1 / 2 turn, which is 2 pairs of poles. Similarly, if the windings are arranged according to a certain rule, 3 pairs of poles, 4 pairs of poles, or generally P pairs of poles can be obtained, and P is the number of pole pairs of the peak clipping coils 300. The number of peak clipping coils 300 matches the number of pole pairs of the motor, and the number of peak clipping coils 300 can be equal to the number of pole pairs of the motor, or the number of peak clipping coils 300 can be close to the number of pole pairs of the motor, which is not limited here. When the number of peak clipping coils 300 matches the number of pole pairs of the motor, the magnetic field generated by the peak clipping coils 300 and the harmonic magnetic field generated by the stator winding 1 can be approximately offset one-to-one, which can increase the magnetic resistance of the motor yoke 3 to a greater extent, reduce the magnetic density of the motor air gap, and achieve the reduction of air gap force wave vibration, with good vibration reduction and noise reduction effects, and can also alleviate the problem of loose or damaged components caused by motor vibration, thereby improving the working performance of the motor.

[0032] In one embodiment, when the number of the peak clipping coils 300 is more than two, the structures and sizes of each peak clipping coil 300 are matched. When the number of the peak clipping coils 300 is more than two, the magnetic field generated by each coil can offset the magnetic field generated by different stator windings 1, so that the peak clipping coil 300 has a better effect of reducing the air gap magnetic density of the motor. The stator winding 1 is generally also arranged with coils of the same structure and size. In this case, each peak clipping coil 300 uses a peak clipping coil 300 with matching structure and size, so that the working effect generated by each peak clipping coil 300 can be similar, and the magnetic field generated by each peak clipping coil 300 can approximately one-to-one correspond to offset the magnetic field generated by the stator winding 1, and the vibration reduction effect is good. The structures and sizes of each peak clipping coil 300 are matched, and the structures and sizes of each peak clipping coil 300 can be equal, or the structures and sizes of each peak clipping coil 300 can be similar, or the structures and sizes of each peak clipping coil 300 can be the same and the sizes of each peak clipping coil 300 are similar, or the structures and sizes of each peak clipping coil 300 are the same, and the sizes of each peak clipping coil 300 are similar, and the sizes of each peak clipping coil 300 are the same, which is not limited here. The structure of the peak clipping coil 300 is not unique, and generally includes an internal conductor and an external insulating layer. The internal conductor is wrapped by the external insulating layer. The internal conductor is used to generate a magnetic field by electromagnetic induction after power is turned on, and the external insulating layer is used to insulate the internal conductor from the external environment. This can not only avoid the potential safety hazard caused by leakage of the peak clipping coil 300, but also reduce the interference of the external environment on the operation of the peak clipping coil 300, thereby improving the working performance of the peak clipping coil 300. It can be understood that in other embodiments, the peak clipping coil 300 can also be other structures, as long as the technicians in this field believe that it can be realized. The size of the peak clipping coil 300 can be adjusted according to actual needs and other structures of the motor, and is not limited here.

[0033] In one embodiment, the cross-sectional size of the peak clipping coil 300 matches the cross-sectional size of the stator winding 1. When the cross-sectional size of the peak clipping coil 300 matches the cross-sectional size of the stator winding 1, the magnitude of the magnetic field generated by the peak clipping coil 300 is approximately equal to the magnitude of the harmonic magnetic field generated by the stator winding 1, so that the magnetic field generated by the peak clipping coil 300 can better offset the harmonic magnetic field generated by the stator winding 1, and the effect of reducing the air gap force wave vibration is good.

[0034] Specifically, the cross-sectional dimensions of the peak clipping coil 300 and the cross-sectional dimensions of the stator winding 1 can be matched by the cross-sectional dimensions of the peak clipping coil 300 being equal to the cross-sectional dimensions of the stator winding 1, or by the cross-sectional dimensions of the peak clipping coil 300 being close to the cross-sectional dimensions of the stator winding 1, and the difference between the cross-sectional dimensions of the peak clipping coil 300 and the cross-sectional dimensions of the stator winding 1 can be within the allowable range. The types of cross-sectional dimensions are not unique, and the cross-sectional shapes of the comparisons can be different according to the different shapes of the cross sections of the peak clipping coil 300 or the stator winding 1 coil, and the cross-sectional shapes of the peak clipping coil 300 or the stator winding 1 coil are related to the structure of the peak clipping coil 300 or the stator winding 1. For example, the peak clipping coil 300 can use the enameled wire with the same structure as the stator winding 1, and the cross-sectional dimensions of the peak clipping coil 300 and the cross-sectional dimensions of the stator winding 1 can both be regarded as circular, then the cross-sectional dimensions of the peak clipping coil 300 and the cross-sectional dimensions of the stator winding 1 can be regarded as the cross-sectional diameter of the peak clipping coil 300 matching the cross-sectional diameter of the stator winding 1. It can be understood that in other embodiments, the cross-sectional dimensions of the peak clipping coil 300 and the cross-sectional dimensions of the stator winding 1 can also be other types of data, such as cross-sectional areas, etc., as long as those skilled in the art believe that the cross-sectional dimensions of the two can be characterized, and they will not be elaborated here.

[0035] In one embodiment, the vibration sensor 200 is an acceleration sensor or a displacement sensor. The type of vibration sensor 200 is not unique, as long as it can detect the vibration of the motor. For example, the vibration sensor 200 can be an acceleration sensor, which can detect the change in vibration speed within a certain period of time, thereby obtaining a vibration signal. The vibration sensor 200 can also be a displacement sensor, which can detect the displacement of the detection part of the motor within a period of time, so that the speed of vibration of the detection part of the motor can be calculated, thereby obtaining a vibration signal. It can be understood that in other embodiments, the vibration sensor 200 can also be of other types, and can also include more than two different types at the same time, which can be selected according to actual needs, as long as those skilled in the art believe that it can be achieved.

[0036] In order to better understand the above embodiment, a detailed explanation is given below in conjunction with a specific embodiment. In one embodiment, from the perspective that the rotating motor rotor 4 generates irregular vibration after being subjected to the Maxwell force, the motor control device includes a vibration sensor 200, a controller 100 and a peak clipping coil 300. The vibration sensor 200 can be an acceleration sensor or a displacement sensor. The peak clipping coil 300 is similar in structure to the motor winding coil, but the span is different, and the material can also be the enameled wire used for the motor winding coil. First, the vibration sensor 200 detects the vibration frequency and amplitude of the motor. The vibration sensor 200 converts these vibration signals into voltage signals and outputs them to the controller 100. Then the controller 100 analyzes the voltage signal to determine the pulse frequency and pulse current size of the given peak clipping coil 300. Finally, a magnetic field of a given pulse current is generated in the peak clipping coil 300. The magnetic field fluctuates periodically with the pulse current. This magnetic field increases the magnetic resistance of the yoke 3 and reduces the air gap magnetic density, thereby weakening the amplitude of the fixed vibration frequency, thereby reducing the vibration of the motor. For example, when a vibration frequency of 100 Hz and an amplitude of 130 dB are detected, and this peak is the maximum peak in the vibration spectrum, the controller 100 will clip this peak. The main principle is to increase the magnetic resistance of the motor yoke 3 through the peak clipping coil 300, thereby reducing the magnetic density of the motor air gap, and finally achieving the effect of reducing the air gap force wave vibration.

[0037] For details, please refer to the working process of the motor control device. Figure 2 After receiving the voltage signal from the vibration sensor 200, the controller 100 sends a pulse command to the peak clipping coil 300. After the peak clipping coil 300 is energized, it generates a reverse magnetic field, which increases the magnetic resistance of the motor yoke 3, thereby reducing the magnetic density of the motor air gap, and finally reducing the air gap force wave vibration. In addition, the controller 100 can continuously adjust the pulse command according to the size of the received voltage signal, and finally reduce the harmonics to achieve the effect of vibration reduction and noise reduction. After the controller 100 receives the vibration signal from the sensor, there is generally a vibration velocity or vibration acceleration. The vibration signal is then analyzed. For example, a vibration signal has a frequency of 100 Hz and an amplitude of 130 dB. In this case, a pulse voltage with a frequency of 100 Hz is provided to the peak clipping coil 300. The voltage amplitude can be determined according to the attenuation of the amplitude. For example, the amplitude of every 100 dB is initially set to 10 V. If the amplitude is not attenuated, it is increased to 20 V. If the vibration is attenuated, it can be reduced to 5 V until the vibration meets the requirements. The pulse signal is adjusted as needed so that the peak clipping coil 300 acted upon by the pulse signal can better achieve the effect of vibration reduction.

[0038] The vibration reduction and noise reduction device includes three devices: a vibration sensor 200, a controller 100, and a peak clipping coil 300. The vibration sensor 200 is located at the motor foot and can timely and accurately receive the vibration signal of the motor and convert it into a voltage signal. The vibration sensor 200 can also be placed in other locations, mainly based on demand. For example, if the vibration of the foot is to be tested, it can be placed at the foot; if the end cover is to be tested, it can also be placed at the end cover. Please refer to Figure 3 The controller 100 is a control panel integrated with signal receiving, amplification, processing and conversion. It is located inside the motor junction box and is responsible for issuing pulse instructions to the peak clipping coil 300 after receiving the voltage signal. Figure 4 , the peak clipping coil 300 is evenly embedded in the open slot of the outer circle of the stator core, so that after the peak clipping coil 300 is energized, a magnetic field opposite to the harmonic magnetic field generated by the stator winding 1 is generated. Or a plurality of evenly distributed through holes are opened inside the stator core, and a component consisting of a multi-turn coil winding and an iron core is installed in the through hole. After the three-phase current is passed through the coil winding, a magnetic field opposite to the stator winding 1 is generated, thereby offsetting the harmonics generated by the stator winding 1 to adjust the vibration of the rotating motor. The electromagnetic coil slot type and the winding method of the electromagnetic coil can be modified according to different actual needs. The number of peak clipping coils 300 is adjusted according to the number of pole pairs of the motor, and one is set for each pole, and the position is opposite to the geometric center line of the coil of each pole of the motor winding. When the number of peak clipping coils 300 is more than two, the structural dimensions of each coil need to be consistent to improve the working performance of the motor control device.

[0039] When the rotating motor is powered on, the rotor 4 generates irregular vibrations after receiving the radial electromagnetic force of the Maxwell force, further transmitting vibrations to the structure and radiating noise to the air. At this time, the vibration sensor 200 at the base of the rotating motor detects the vibration frequency and amplitude signals, and the vibration sensor 200 converts the detected vibration signal into a voltage signal and transmits it to the controller 100 in the motor junction box through the line. After receiving the voltage signal, the controller 100 determines whether the voltage signal is below the set value. If the voltage signal value is above the set value, the controller 100 will immediately issue a pulse instruction to the peak clipping coil 300, so that after the peak clipping coil 300 is energized, a magnetic field with the same frequency, opposite direction and equal amplitude to the magnetic field generated by the stator winding 1 is generated, thereby offsetting the harmonic magnetic field generated by the stator winding 1. Among them, the stator winding 1 rotates according to the timing of the three-phase electricity. The position of the rotating magnetic field can be determined in the controller 100 according to the timing of the three-phase electricity, and Hall sensors and other acquisitions can also be added to ensure that the magnetic field generated by the peak clipping coil 300 is equal in amplitude and opposite in direction to the magnetic field generated by the stator winding 1. At the same time, the controller 100 can repeatedly adjust the strength of the reverse magnetic field generated by the peak clipping coil 300 according to the size of the received voltage signal, and can achieve the full range of offsetting the harmonic magnetic field generated by the stator winding 1, until the controller 100 receives a voltage signal within a set value. This set value can be set by the user according to the working environment of the motor, thereby achieving the effect of reducing noise. The motor control device solves the vibration problem of the rotating motor and the derived problems of high noise, easy loosening, wear, failure and damage of the unit parts, and low service life. It can reduce the vibration noise of the rotating motor, reduce the failure rate of the rotating motor and the unit equipment, extend the service life of the equipment, and improve the operating reliability of the electromechanical equipment.

[0040] The motor control device includes a vibration sensor 200, a controller 100 and a peak clipping coil 300. The vibration sensor 200 is arranged on the motor, and the peak clipping coil 300 is arranged on the side of the stator winding 1 away from the rotor 4 of the motor. The vibration sensor 200 and the peak clipping coil 300 are both connected to the controller 100. The vibration sensor 200 is used to detect the vibration of the motor to generate a vibration signal and transmit it to the controller 100. The controller 100 is used to generate a pulse signal according to the vibration signal and transmit it to the peak clipping coil 300. The pulse signal is used to control the peak clipping coil 300 to generate a magnetic field opposite to the harmonic magnetic field generated by the stator winding 1 of the motor. The controller 100 generates a pulse signal to the peak clipping coil 300 according to the vibration of the motor, so that the peak clipping coil 300 generates a magnetic field opposite to the magnetic field generated by the stator winding 1, which can offset the harmonic magnetic field generated by the stator winding 1, increase the magnetic resistance of the motor yoke 3, reduce the magnetic density of the motor air gap, achieve the reduction of air gap force wave vibration, and have a good vibration reduction and noise reduction effect. It can also alleviate the problem of loose or damaged components caused by motor vibration, and improve the working performance of the motor.

[0041] In one embodiment, see Figure 5 , a motor control method is provided, which can be executed by a controller 100, and the motor control method includes the following steps:

[0042] Step S110: Acquire the vibration signal of the motor.

[0043] Among them, the vibration signal is obtained by the vibration sensor 200 detecting the vibration of the motor. The vibration sensor 200 is mainly used to detect the vibration of the motor to generate a vibration signal and transmit it to the controller 100. The position where the vibration sensor 200 is set is not unique, as long as the vibration of the motor can be detected, it can be selected according to the actual needs of the user. For example, if the vibration of the base needs to be detected, the vibration sensor 200 is set at the base. If the vibration of the end cover needs to be detected, the vibration sensor 200 is set at the end cover. The vibration sensor 200 can also be set at other positions as needed. Further, the number of vibration sensors 200 is not unique, for example, it can be more than two, and each vibration sensor 200 can be set at different positions of the motor to detect the vibration at different positions of the motor, so as to better realize the monitoring of the vibration of the motor. The type of vibration sensor 200 is not unique, as long as the vibration of the motor can be detected. For example, the vibration sensor 200 can be an acceleration sensor, which can detect the change of the vibration speed within a certain period of time, thereby obtaining a vibration signal. The vibration sensor 200 can also be a speed sensor, which can detect the vibration speed at different times, thereby obtaining a vibration signal. It is understandable that in other embodiments, the vibration sensor 200 may also be of other types, and may also include more than two different types at the same time, which can be selected according to actual needs as long as those skilled in the art believe that it can be implemented.

[0044] The types of vibration signals are not unique, and generally can include vibration frequency and vibration amplitude. The vibration frequency can characterize the speed of the motor vibration, and the vibration amplitude can characterize the degree of the motor vibration. When the vibration signal includes the vibration frequency and the vibration amplitude, the vibration signal can reflect the characteristics of the motor vibration, so that the subsequent processing of the motor vibration has better pertinence. It can be understood that the vibration signal referred to in this embodiment can be either the vibration frequency or the vibration amplitude that directly reflects the vibration characteristics, or it can be a voltage signal obtained after conversion according to the vibration signal.

[0045] Step S120 : generating a pulse signal according to the vibration signal and transmitting the pulse signal to the peak clipping coil 300 .

[0046] Among them, the pulse signal is used to control the peak clipping coil 300 to generate a magnetic field opposite to the harmonic magnetic field generated by the stator winding 1 of the motor. The peak clipping coil 300 is arranged on the side of the stator winding 1 away from the rotor 4 of the motor. The controller 100 is a control board that integrates functions such as signal reception, amplification, processing, and conversion. It can be arranged inside the motor junction box to facilitate the connection of various signal lines and power lines. The motor junction box can also play a certain protective role for the controller 100. After receiving the vibration signal, the controller 100 is responsible for generating a pulse signal according to the vibration signal and transmitting it to the peak clipping coil 300. The characteristics of the pulse signal generated by the controller 100 are determined according to the characteristics of the received vibration signal. Taking the vibration signal including vibration frequency and vibration amplitude as an example, when the vibration frequency is 100Hz, the controller 100 can generate a pulse signal with a frequency of 100Hz and transmit it to the peak clipping coil 300. The amplitude of the pulse signal can be adjusted according to the attenuation of the vibration amplitude. For example, when the vibration amplitude is 130dB, if the amplitude of every 100dB is set to correspond to 10V, then if the vibration amplitude is not attenuated, the amplitude of the pulse signal is increased to 20V. If the vibration amplitude is attenuated, the amplitude of the pulse signal can be reduced to 5V until the vibration of the motor meets the requirements. Furthermore, the controller 100 can obtain the corresponding voltage signal according to the received vibration signal, compare the voltage value corresponding to the voltage signal with the preset voltage value, and send the pulse signal to the peak clipping coil 300 only when the voltage value is below the set value, so as to realize the on-demand start-up of the peak clipping coil 300 and improve the work efficiency.

[0047] After receiving the pulse signal, the peak clipping coil 300 can generate a magnetic field opposite to the harmonic magnetic field generated by the stator winding 1. The stator winding 1 rotates according to the timing of the three-phase electricity. The controller 100 can determine the position of the rotating magnetic field according to the timing of the three-phase electricity, and send a corresponding pulse signal according to the position of the magnetic field generated by the stator winding 1. It can also increase the detection voltage value of devices such as Hall sensors, and send a corresponding pulse signal to the peak clipping coil 300 according to the detected voltage value. After receiving the pulse signal, the peak clipping coil 300 can generate a magnetic field opposite to the magnetic field generated by the stator winding 1, or generate a magnetic field that is opposite to the magnetic field generated by the stator winding 1 and matches the magnetic field amplitude generated by the stator winding 1, thereby offsetting the harmonic magnetic field generated by the stator winding 1, increasing the magnetic resistance of the motor yoke 3, reducing the magnetic density of the motor air gap, achieving the reduction of air gap force wave vibration, and having a good vibration reduction and noise reduction effect. It can also alleviate the problem of loose or damaged components caused by motor vibration, and improve the working performance of the motor.

[0048] The peak clipping coil 300 is arranged on the side of the stator winding 1 away from the rotor 4 of the motor, and can be specifically arranged on the stator core, and the stator core can also have a certain fixing effect on the peak clipping coil 300. The stator winding 1 is arranged on the inner side of the stator core, close to the rotor 4, and the peak clipping coil 300 is arranged on the side of the stator winding 1 away from the rotor 4 of the motor. It can be arranged inside the stator core, or it can be arranged on the periphery of the stator core, which can be adjusted according to actual needs. Generally speaking, the peak clipping coil 300 is directly opposite to the geometric center line of each pole coil of the motor winding, and the effect of offsetting the magnetic field is better. In an extensible way, the peak clipping coil 300 is similar to the structure of the motor winding coil, which is convenient for controlling the size of the magnetic field generated by the peak clipping coil 300. The peak clipping coil 300 has a different span from the motor winding coil. According to the structural requirements, the type of the peak clipping coil 300 can be the same or similar to the type of the motor winding, so as to better maintain the consistency of the motor structure and improve the working performance of the motor.

[0049] The motor control method includes a vibration sensor 200, a controller 100 and a peak clipping coil 300. The vibration sensor 200 is arranged on the motor, and the peak clipping coil 300 is arranged on the side of the stator winding 1 away from the rotor 4 of the motor. The vibration sensor 200 and the peak clipping coil 300 are both connected to the controller 100. The vibration sensor 200 is used to detect the vibration of the motor to generate a vibration signal and transmit it to the controller 100. The controller 100 is used to generate a pulse signal according to the vibration signal and transmit it to the peak clipping coil 300. The pulse signal is used to control the peak clipping coil 300 to generate a magnetic field opposite to the harmonic magnetic field generated by the stator winding 1 of the motor. The controller 100 generates a pulse signal to the peak clipping coil 300 according to the vibration of the motor, so that the peak clipping coil 300 generates a magnetic field opposite to the magnetic field generated by the stator winding 1, which can offset the harmonic magnetic field generated by the stator winding 1, increase the magnetic resistance of the motor yoke 3, reduce the magnetic density of the motor air gap, achieve the reduction of air gap force wave vibration, and have a good vibration reduction and noise reduction effect. It can also alleviate the problem of loose or damaged components caused by motor vibration, and improve the working performance of the motor.

[0050] In one embodiment, a rotating motor is provided, comprising a motor and a motor control device as described above. The vibration sensor 200 in the motor control device is arranged on the motor, and is used to detect the vibration of the motor, generate a vibration signal, and transmit it to the controller 100. Specifically, it can be arranged at the foot or end cover of the motor. The controller 100 in the motor control device can be arranged inside the motor junction box, which is convenient for connecting various signal lines and power lines, and the motor junction box can also play a certain protective role for the controller 100. The peak clipping coil 300 in the motor control device is arranged on the side of the stator winding 1 away from the rotor 4 of the motor. After the controller 100 generates a pulse signal according to the vibration signal and transmits it to the peak clipping coil 300, the peak clipping coil 300 generates a magnetic field opposite to the harmonic magnetic field generated by the stator winding 1 of the motor, which can offset the harmonic magnetic field generated by the stator winding 1, increase the magnetic resistance of the motor yoke 3, reduce the magnetic density of the motor air gap, achieve the reduction of air gap force wave vibration, and have a good vibration reduction and noise reduction effect. It can also alleviate the problem of loose or damaged components caused by motor vibration, and improve the working performance of the motor.

[0051] In one embodiment, the motor includes a stator core, and a through slot penetrating the two end faces of the stator core is provided on the periphery of the stator core, and the peak clipping coil 300 is arranged in the through slot. The peak clipping coil 300 is arranged on the side of the stator winding 1 away from the rotor 4 of the motor, and can be specifically arranged on the stator core, and the stator core can also have a certain fixing effect on the peak clipping coil 300. The stator winding 1 is arranged on the inner side of the stator core, close to the rotor 4, and the peak clipping coil 300 is arranged on the side of the stator winding 1 away from the rotor 4 of the motor, which can be arranged inside the stator core or on the periphery of the stator core, which can be adjusted according to actual needs. In this embodiment, a through slot penetrating the two end faces of the stator core is provided on the periphery of the stator core, and the peak clipping coil 300 is arranged in the through slot, so that the position of the peak clipping coil 300 is not easy to change, and the peak clipping coil 300 is arranged on the stator core to reduce some electromagnetic losses, so that most of the generated magnetic field can be used to offset the magnetic field generated by the stator winding 1. Furthermore, the through slots formed on the periphery of the stator core are evenly distributed and arranged at equal distances, so that the peak clipping coils 300 can also be arranged at equal distances, thereby improving the working stability of the motor.

[0052] In one embodiment, the motor includes a stator core, and a through hole penetrating two end surfaces of the stator core is formed inside the stator core, and the peak clipping coil 300 is arranged in the through hole. The peak clipping coil 300 is arranged in the through hole so that the peak clipping coil 300 can be better fixed in position without taking up too much extra space, and the peak clipping coil 300 is arranged on the stator core to reduce some electromagnetic losses, so that most of the generated magnetic field can be used to offset the magnetic field generated by the stator winding 1. Furthermore, the through holes formed inside the stator core are evenly distributed and arranged at equal distances, so that each peak clipping coil 300 can also be arranged at equal distances, thereby improving the working performance of the peak clipping coil 300.

[0053] In one embodiment, the vibration sensor 200 is disposed on the foot of the motor. The foot is a bearing component that bears most of the components of the entire motor. Its vibration is obvious and can well reflect the vibration of the motor. When the vibration sensor 200 is disposed at the foot of the motor, the change of the motor vibration can be better monitored, so that the peak clipping coil 300 can respond in time, which is conducive to timely vibration reduction of the motor. It can be understood that in other embodiments, the peak clipping can also be set at other positions as needed, as long as the technicians in this field believe that it can be achieved.

[0054] The above-mentioned rotating motor includes a vibration sensor 200, a controller 100 and a peak clipping coil 300. The vibration sensor 200 is arranged on the motor, and the peak clipping coil 300 is arranged on the side of the stator winding 1 away from the rotor 4 of the motor. The vibration sensor 200 and the peak clipping coil 300 are both connected to the controller 100. The vibration sensor 200 is used to detect the vibration of the motor to generate a vibration signal and transmit it to the controller 100. The controller 100 is used to generate a pulse signal according to the vibration signal and transmit it to the peak clipping coil 300. The pulse signal is used to control the peak clipping coil 300 to generate a magnetic field opposite to the harmonic magnetic field generated by the stator winding 1 of the motor. The controller 100 generates a pulse signal to the peak clipping coil 300 according to the vibration of the motor, so that the peak clipping coil 300 generates a magnetic field opposite to the magnetic field generated by the stator winding 1, which can offset the harmonic magnetic field generated by the stator winding 1, increase the magnetic resistance of the motor yoke 3, reduce the magnetic density of the motor air gap, achieve the reduction of air gap force wave vibration, and have a good vibration reduction and noise reduction effect. It can also alleviate the problem of loosening or damage of components caused by motor vibration, and improve the working performance of the motor.

[0055] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0056] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A motor control device, characterized in that: It comprises a vibration sensor, a controller and a peak clipping coil, wherein the vibration sensor is arranged on the motor, the peak clipping coil is arranged on a side of the stator winding of the motor away from the rotor of the motor, the peak clipping coil is directly opposite to the geometric center line of each pole coil of the motor winding, the type of the peak clipping coil is the same as the type of the motor winding, and the vibration sensor and the peak clipping coil are both connected to the controller; The vibration sensor is used to detect the vibration of the motor to generate a vibration signal and transmit it to the controller. The controller is used to generate a pulse signal according to the vibration signal and transmit it to the peak clipping coil. The pulse signal is used to control the peak clipping coil to generate a magnetic field opposite to the harmonic magnetic field generated by the stator winding of the motor.

2. The motor control device according to claim 1, characterized in that: The number of the peak-shaving coils is the same as the number of pole pairs of the motor.

3. The motor control device according to claim 1, characterized in that: When the number of the peak shaving coils is more than two, the structures and sizes of the peak shaving coils are the same or similar.

4. The motor control device according to claim 1, characterized in that: The cross-sectional dimension of the peak clipping coil is the same as or close to the cross-sectional dimension of the stator winding.

5. The motor control device according to claim 1, characterized in that: The vibration sensor is an acceleration sensor or a displacement sensor.

6. A motor control method, applied to the motor control device according to any one of claims 1 to 5, characterized in that: The following steps are involved: Acquire a vibration signal of the motor; the vibration signal is obtained by a vibration sensor detecting the vibration of the motor; A pulse signal is generated according to the vibration signal and transmitted to the peak clipping coil; the pulse signal is used to control the peak clipping coil to generate a magnetic field opposite to the harmonic magnetic field generated by the stator winding of the motor, and the peak clipping coil is arranged on the side of the stator winding of the motor away from the rotor of the motor.

7. A rotating electrical machine, characterized in that: It comprises a motor and a motor control device as described in any one of claims 1 to 5.

8. The rotating electrical machine according to claim 7, characterized in that The motor comprises a stator core, a through slot penetrating two end surfaces of the stator core is formed on the periphery of the stator core, and the peak clipping coil is arranged in the through slot.

9. The rotating electrical machine according to claim 7, characterized in that: The motor comprises a stator core, a through hole penetrating two end surfaces of the stator core is formed inside the stator core, and the peak clipping coil is arranged in the through hole.

10. The rotating electrical machine according to claim 7, characterized in that The vibration sensor is arranged on the base foot of the motor.

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