1034 results about "Motor vibration" patented technology

An improved system for monitoring vibration of an electric machine is disclosed. According to one embodiment, sensors are positioned in a plane orthogonal to the motor shaft and each sensor detects vibration along at least one axis of the motor. The sensors are oriented such that the polarity of each sensor is reversed. The pairs of sensors may be used to isolate specific vibrations within the motor. According to another embodiment, a sensor may be mounted directly to the motor shaft. The sensor on the motor shaft directly detects vibrations along the motor shaft. Optionally, a second sensor may be mounted to a fixed location within the motor housing, and the combination of the sensor on the motor shaft and the sensor at a fixed location may be used to isolate specific vibrations within the motor. A motor controller may adjust operation of the motor to reduce the isolated vibration.

The invention provides a method for starting a motor without sensor in order to overcome the shortcoming of the starting method by controlling a permanent magnetic motor based on no motor in the prior art. The method has strong commonality and wide suitable scope, can smoothly switch to a speed closed ring control from a speed opened ring control and is free from being affected by loading feature. In the process of switching to the speed closed ring control from the speed opened ring control, a rotor position given value gradually approaches to a rotor position estimated value, so as to stably control the switching process of the speed opened and closed ring controls in the starting process of the motor, prevent the current of the motor from suddenly changing, stabilize the motor revolving speed, greatly decrease the motor vibration and promote the success ratio of switching. Furthermore, the method is free from being affected by loading feature in the switching process and has strongcommonality and wide suitable scope.

The invention provides an electromagnetic clamping mechanism which comprises an electromagnet, a permanent magnet and a deformable body. The permanent magnet is arranged on a magnetic link of the electromagnet, a control magnetic circuit is formed between the permanent magnet and the electromagnet, the permanent magnet moves relative to the electromagnet under the drive of the magnetic field of the control magnetic circuit, the deformable body is driven to deform, and then clamping locking and releasing are achieved. The invention further provides a linear driving device and combination with the electromagnetic clamping mechanism. According to the electromagnetic clamping mechanism and the linear driving device and combination with the electromagnetic clamping mechanism, due to the fact that magnetic poles of the permanent magnet and the electromagnet make contact with each other or are close to each other, the functions of large driving force, large displacement, high-precision driving and power off clamping keeping are formed, existing electric and magnetostrictive drive material application equipment and instruments are improved, and the electromagnetic clamping mechanism and the linear driving device and combination with the electromagnetic clamping mechanism can be widely applied in the field of drivers (actuators), brakes, sensors, motors, vibration and control equipment, robots, precision manufacturing, biomedical engineering and the like.

The invention discloses a rolling bearing fault diagnosis method based on a convolutional neural network (CNN). By aiming at problems of rolling bearing characteristic components such as easy submergence and difficulty in extraction and combining with rolling bearing signal own and large monitoring data quantity and other characteristics, the CNN is introduced in the rolling bearing fault diagnosis. By short time Fourier Transform, a motor vibration signal is converted into a time frequency spectrogram to be adapted to a CNN network training sample format, and then mass sample data having labels used to express different faults is established, and therefore sample diversity is guaranteed, and network overfitting is prevented. The CNN network having a proper layer number is established, and parameters are initialized, and then the preprocessed samples are input in the CNN for forward propagation. By combining with predetermined label calculation errors, a network weight is adjusted by using an error reverse propagation algorithm, and then after a plurality of times of iterations, the network used for the interconnection between the signal and equipment is established, and therefore the rolling bearing fault accurate diagnosis is realized.

The invention provides a method and a device for reducing vibration noise of a motor. The method for reducing the vibration noise of the motor includes a, acquiring measured values of the frequency and the amplitude of the vibration noise of the motor and storing the measured values; b, computing theoretical values of the frequency and the amplitude of the vibration noise of the motor according to calibration parameters of the motor; c, comparing the measured values acquired in the step a to the theoretical values computed in the step b, and computing pre-compensation quantities for the frequency and the amplitude of the vibration noise of the motor; d, generating a novel control parameter according to the pre-compensation quantities; f, generating PWM (pulse width modulation) signals according to the novel control parameter; g, controlling the motor according to the PWM signals. The method and the device have the advantages that the measured values of the vibration noise of the motor are compared to the theoretical values of the vibration noise of the motor, pre-compensation can be carried out on the motor, motor control strategies can be adjusted, accordingly, the vibration noise of the motor can be reduced, the method is simple and reliable, the cost is low, and the service life of the motor can be prolonged.

The invention relates to a constant-force grinding and polishing tool system and belongs to grinding and polishing tools. The constant-force grinding and polishing tool system comprises a power device, a gear change grinding tool, a damping device, a guide device, a force compensation and detection device and a counter weight device to realize constant-force grinding. A grinding tool head guarantees the gear change grinding tool to move vertically by the aid of the guide device to form a blade normal grinding and polishing force through total weight resultant force of the tool system and a low-friction countercylinder. A tool head normal force is measured and compared with a set value by an S-type sensor, a final value is fed back to a computer, and the low-friction countercylinder is regulated and controlled for force compensation by an electrical appliance proportional valve. The power device insulates vibration influences of a motor vibration source on the tool system by the aid of the damping device, and high-precision force control is realized through feedback of the S-type sensor. The constant-force grinding and polishing tool system has the advantages that the system is novel in structure, constant-force polishing of blade surfaces with different curvatures is realized, surface uniformity is realized, residual stress is diminished, and polishing efficiency is improved.

The invention discloses a monitoring device for temperature rise and vibration of a motor and a realizing method thereof, solving the problems of the present monitoring device that the motor vibration monitoring is defective, the monitoring data is incomplete and the like. The monitoring device for temperature rise and vibration comprises a microprocessor, a power supply processing module, a motor current collecting module, a motor vibration and temperature rise collecting module, a man-machine interaction module and a communication data transmission module, wherein the microprocessor is used for receiving and processing the data information; the power supply processing module is used for supplying power for the operation of the device; the motor current collecting module is used for collecting and converting a voltage signal which is converted from the current acquired by a current transformer; the motor vibration and temperature rise collecting module is used for collecting the motor vibration and temperature data information; the man-machine interaction module is used for realizing man-machine interaction; the communication data transmission module is used for uploading the monitored condition of the motor to a detection system. The monitoring device provided by the invention has a current detection function and can be used for comprehensively monitoring the abnormal overload, abnormal temperature rise and abnormal vibration of the motor.

The invention discloses a low-vibration noise performance fractional slot concentrated winding permanent magnet motor and a design method, and belongs to the field of rotating motors. On the basis ofa motor matched with an existing notched pole, and some stator additional teeth are correspondingly added (the specific number of the teeth is determined according to the matched notched pole of the motor). For a three-phase 18/16 motor, six additional teeth are added, the position of each stator notch is calculated, and the winding structure adopts a concentrated winding structure corresponding to the three-phase 18/16 motor. The rotor structure adopts the common surface-mounted structure, and radial magnetizing is adopted; the motor has the advantages that the stator structure is changed, the content of tooth harmonic waves in the winding magnetomotive force in an air gap is lowered, therefore, the motor vibration and noise are lowered, and meanwhile the rotating torque of the motor is ensured. In addition, due to changes of the stator structure, the content of subharmonic waves of the magnetomotive force in the air gap is lowered, and then eddy-current losses generated in the permanent magnet are lowered. Accordingly, the motor has the great significance in motor body designing.

The invention discloses an on-line state monitoring system for a medium speed maglev train,which comprises a temperature monitoring subsystem,a vibration monitoring subsystem and a current monitoringsubsystem; the whole monitoring system comprises a vibration sensor,a temperature sensor,a vibration collector,a temperature transmitter,a vehicle host and a vehicle-ground communication device,a cable; the system is divided into vehicle-mounted equipment and ground equipment,wherein the vehicle host in the vehicle-mounted equipment is respectively connected with the communication equipment,the vibration collector and the temperature transmitter; the ground equipment comprises a suspension frame vibration sensor,a linear motor vibration sensor; a current collector vibration sensor,a suspensionelectromagnet temperature sensor,a linear motor temperature sensor and a current collector temperature sensor. According to the invention,the running state monitoring of the key components of the medium speed maglev train,such as the linear motor,the electromagnet and the current collector,is monitored,the running state of each key component is intelligently analyzed and evaluated,and a basis forguiding the operation and maintenance and the optimization design of the train is provided.

The present invention relates to the technical field of electronic devices, and discloses a motor vibration control method and apparatus. The method comprises: acquiring an input signal obtained according to a desired motor vibration curve; inputting a digital signal sequence of the input signal into an equalizer to obtain an output signal processed by an equalizer; and inputting the output signalto the motor to control vibration of the motor, wherein the equalizer is a digital filter constructed according to a damping coefficient zeta, a resonance frequency [omega]n, a preset system samplingrate fs, a preset damping coefficient [zeta]d and a preset cutoff frequency [omega]d of the motor. The motor vibration control method and apparatus provided by embodiments of the present invention have an advantage that an actual vibration effect of the motor can conform to a desired motor vibration curve.

The invention provides a motor vibration control method and device and a computer readable storage medium. The method comprises the steps: amplifying a steady-state voltage to generate a first voltagesignal for controlling the accelerated vibration of a motor to a target vibration amplitude lower than the steady-state vibration amplitude; attenuating a starting voltage to the steady-state voltageto generate a second voltage signal for controlling the motor to vibrate from the target vibration amplitude to the steady-state vibration amplitude; generating a steady-state voltage signal used forcontrolling steady-state vibration of the motor based on the steady-state voltage with the preset duration; and finally controlling the motor to vibrate through the target voltage signal generated bythe first voltage signal, the second voltage signal and the steady-state voltage signal. Through the implementation of the invention, the steady-state voltage is amplified to be used as the excitation voltage of the motor vibration acceleration section, and then the excitation voltage is stably reduced to the steady-state voltage, so that the acceleration time of the motor vibration response in the early stage is effectively shortened, and the hysteresis feeling of the motor vibration feedback to a user is reduced.

The embodiment of the invention relates to the technical field of electronic devices and discloses a motor driving signal generating method which comprises a step of acquiring an acceleration segmentsignal, a constant segment signal and an attenuation segment signal, wherein the frequencies of the constant segment signal and the attenuation segment signal are smaller than that of the accelerationsegment signal, a step of connecting the acceleration segment signal and the constant segment signal and reserving a silent period without signal output between the braking segment and the constant segment to obtain a first motor driving signal, a step of adjusting the constant segment signal parameters of the first motor driving signal according to a vibration sensing demand and splicing the attenuation segment signal to the adjusted first motor driving signal to obtain a second motor driving signal, and a step of adjusting the attenuation segment signal parameters of the second motor driving signal to obtain the second motor driving signal with the highest braking efficiency and determining the second motor driving signal with the highest braking efficiency as a final motor driving signal. A low-frequency heavy tactile effect can be achieved when the motor vibration is controlled, and the fidelity of a specific tactile effect in scenes such as game and car central control screens isimproved.

The invention discloses a test method and device for nonlinear parameters of a motor, and the method comprises the following steps of exciting vibration of the motor by using an excitation signal, performing synchronous information acquisition on the motor in a vibrating state to obtain a voltage measured value and a current measured value, acquiring a linear parameter initial value and a nonlinear parameter initial value of the motor, calculating a linear parameter target value of the motor according to the voltage measured value, the current measured value and the linear parameter initial value, and calculating a nonlinear parameter target value of the motor by adaptive filtering according to the voltage measured value, the current measured value, the linear parameter target value and the nonlinear parameter initial value. By measuring the nonlinear parameters of the motor, accurate control of the motor vibration is realized by using a nonlinear model to improve the control accuracyof the motor, thereby improving motor performance.

The invention relates to an ultra high speed test CRH train bogie and belongs to the field of railway vehicle bogie devices with elastic deformation buffering capacity, the problem of welding stress centralization is solved by a horizontal and longitudinal beam integrated type tray frame, and a wing-shaped elastic support arm of an elastic frame can have a damping effect by own elastic deformation. According to the novel bogie, by the aid of matching usage of the elastic frame and motor suspension devices with vibration absorption functions, high cut-down and inhibition effects can be realized on motor vibration, and accordingly, the vibration frequency control difficulty of a power system is reduced greatly and surplus vibration damping buffering components can be effectively cut down, so that redundant components can be simplified greatly, the structure dimension is shortened, and the weight is reduced. Master pin backward titling structures of traction wheel sets can swing consistently in S shapes. The ultra high speed test CRH train bogie can overcome inherent mutual contradiction of dual requirements on two aspects of lightweight design and speed lifting of a 500km/h ultra high speed train and is a novel breakthrough in the field of localization ultra high speed bogies.

The invention relates to a test system and a test method for an open-end winding permanent magnet synchronous motor. The test system comprises a conventional test system comprising a permanent magnet synchronous load motor and a to-be-tested open-end winding driving motor which are coaxially connected through a torque sensor, a piezoelectric acceleration sensor added to a casing of the to-be-tested open-end winding driving motor, a temperature sensor, a driving motor inverter temperature sensor arranged on a casing of a driving motor inverter as well as a manual control panel connected onto the driving motor inverter in parallel, wherein the torque sensor, a rotating transformer, a driving motor temperature sensor, the driving motor inverter temperature sensor, the piezoelectric acceleration sensor, a driving motor current sensor, a driving motor inverter current sensor and a power voltage sensor are in communication connection with a data acquisition card respectively. The test system and the test method can switch the winding state of the open-end winding motor dynamically in real time and can measure motor vibration and torque fluctuation of the motor as well as temperature increase of motor and inverter systems in a switching process.

The invention discloses a vibration-state on-line monitoring method of a high-voltage motor driving a conveying belt. The method is characterized by setting vibration sensors used for outputting vibration signals on each bearing seat of a high voltage motor and collecting vibration characteristic signals; establishing an electromagnetic vibration classification index caused by a high voltage motor stator abnormity, extracting a electromagnetic vibration fault characteristic caused by an uneven air gap, establishing an electromagnetic vibration classification index caused by a rotor conducting bar abnormity, extracting a mechanical vibration fault characteristic caused by imbalance, establishing a mechanical vibration classification index generated by a rolling bearing abnormity and extracting a mechanical vibration fault characteristic caused by poor high voltage motor installation and adjustment respectively; according to the collected vibration characteristic signals, through certain operation, obtaining the indexes of monitoring a high voltage motor fault and carrying out corresponding early warning. In the invention, the classification index of high voltage motor vibration diagnosis is established; electrical and mechanical failure faults of the high voltage motor are accurately forecasted; an operation state and a deterioration trend of the high voltage motor are grasped and safe operation is ensured.

The invention provides an electronic device comprising a framework, a screen assembled with the framework to form an accommodation space and a vibration motor accommodated in the accommodation space and fixedly connected with the framework, wherein the vibration motor is used for driving the framework to vibrate and driving the screen to vibrate to produce sound, the vibration motor comprises a shell, a vibrator and a stator accommodated in the shell, and an elastic part used for suspending the vibrator in the shell, one of the vibrator and the stator comprises a magnetic circuit system, the other one of the vibrator and the stator comprises a coil, and the vibration motor vibrates along a direction vertical to the plane where the screen is located. The vibration motor of the electronic device provided by the invention is fixed to the framework, the vibration motor vibrates and drives the framework to vibrate so as to indirectly drive the screen to vibrate to produce sound, thereby being convenient to control the output audio and good in sound production performance.

The invention discloses a reciprocating type vibrating screen. The reciprocating type vibrating screen comprises a base, a spring, a rack, vibrating motors, reciprocating driving devices, a screen net frame and a combined screen net, wherein the rack is connected with the base through the spring; the vibrating motors are correspondingly mounted on two opposite side surfaces of the rack, and the reciprocating driving devices are mounted on one side surface, adjacent to the side surfaces equipped with the vibrating motors, of the rack; the reciprocating driving devices are connected with the screen net frame and can drive the screen net frame to reciprocate; the combined screen net is detachably positioned on the screen net frame; two discharging ports are formed in the lower part of the combined screen net. According to the reciprocating type vibrating screen, the vibrating motors perform vibrating while the reciprocating moving type screening is carried out, so that materials can be spread to the whole screen net, and as a result, the use area of the screen surface can be increased, and the screening efficiency can be improved; elastic balls are positioned in the combined screen net and can pump to strike the screen net to scatter the agglomerated materials, and as a result, the screening effect can be improved; meanwhile, the screen net can be greatly prevented from being blocked, so that the service life of the screen net can be prolonged.

The invention relates to a mobile terminal and a rapid recording method thereof. The mobile terminal comprises a touch screen driving device, a microcontroller, a motor and a recording module, the microcontroller is used for determining gestures received by a screen of the mobile terminal according to values of an internal preset register of a touch screen driver, sending motor vibration instructions to the motor when recording starting gestures are determined, and sending recording starting signals to the recording module to start recording when starting determination gestures are determined; and sending the motor vibration instructions to the motor when recording finishing gestures are determined, and sending recording finishing signals to the recording module to stop recording when finishing determination gestures are determined. The mobile terminal and the rapid recording method are simple in operation, functions can be rapidly and conveniently achieved, process conceal safety is achieved, and recording in an emergency can be effectively achieved.

The invention relates to a blind person obstacle-avoiding navigation method capable of precisely feeding back distance and direction of an obstacle. According to the method, a signal collecting device, a motor vibration device and a voice prompt device are arranged on a crutch and can rotate along with the crutch, data processing circuits are arranged between the signal collecting device and the motor vibration device and between the signal collecting device and the voice prompt device and are used for receiving collected signals, the collected signals are made to be control signals through set steps of the data processing circuits, and then the control signals are correspondingly transmitted to the motor vibration device and the voice prompt device. The method has the advantages that a single chip microcomputer work unit is used for controlling two ultrasonic sensors to collect the distance between an obstacle and the ultrasonic sensors in real time, the voice prompt device is controlled to feed back the specific distance between the obstacle and a blind person and the specific direction of the obstacle, the motor vibration device is used for feeding back the rough distance between the obstacle and the blind person and the rough direction of the obstacle, and therefore auxiliary navigation is provided for the blind person in the walking process.

The invention discloses an online monitoring and fault-diagnosing device of a main fan for mines. An air pressure signal sensor is arranged at the air opening of the main fan and is connected with PLC through a differential pressure transmitter; an air flow temperature sensor is arranged at the air opening of the main fan and is connected with the PLC through a temperature and humidity transmitter; a motor vibration sensor is arranged on a motor of the main fan and is connected with the PLC through a vibration transmitter; a temperature sensor is arranged on a winding of a motor and is connected with the PLC; a temperature sensor is arranged in a bearing of the motor and is connected with the PLC; a signal sensor is arranged in an electrical cabinet and is connected with the PLC; a voltage and current sensor is arranged on the electrical cabinet and is connected with the PLC through an electricity quantity parameter analyzer; a valve signal sensor is arranged at a valve and is connected with the PLC; the PLC is connected with a switch; the switch is connected with a displayer and a mine safety monitoring center respectively. According to the technical scheme, the drawback that the main fan for mines in the prior art uses a singlechip for control and lacks fault diagnosis is overcome and the device is suitable to be used for monitoring various main fans in mines and giving automatic alarms in case of fault.

The invention provides a laser radar having the self-check function. The radar comprises a laser emitting module, a laser receiving module, a motor scanning module, a self-checking module, an information recording module and a control and data processing module, wherein the self-checking module comprises one or more types of a humidity acquisition unit, an air pressure acquisition unit, a temperature acquisition unit, a voltage acquisition unit, a current acquisition unit, a motor rotation speed acquisition unit and a motor vibration acquisition unit, the control and data processing module isused for determining whether the laser radar is in fault according to the information acquired by the self-checking module, if yes, whether the fault can be solved through adjustment is further determined, if yes, components of the laser radar are controlled for corresponding adjustment, the adjustment information is sent to the information recording module for record, otherwise, the laser radar is controlled for power failure protection. The radar is advantaged in that a problem of aggravation of a micro fault caused by non-timely processing existing in the laser radar can be reduced, and data support can be provided for subsequent maintenance and improvement of the laser radar.

The invention discloses a rotary motor state monitoring method based on a support vector machine and data driving. The method comprises a step of collecting a rotary motor vibration signal, using curve fitting vibration information to predict rotary motor acceleration and speed operation states, and evaluating a motor state according to indexes of an error, motor performance and the like, a step of installing an acquisition node on a shell of rotary motor, obtaining a three-axis vibration signal of a monitoring motor and environment temperature and humidity in real time, transmitting the signal and the environment temperature and humidity to a receiving end through the IOT (Internet of things) wireless communication technology, storing the signal and the environment temperature and humidity to a database from the receiving end, and calculating each node speed spectrogram and other information by using wavelet analysis and an ARIMA model or other time series prediction methods to obtain a prediction curve, a step of adding historical error compensation to get an accurate prediction value, and comparing the prediction value with a true value to get an error at the moment. The error is taken as a main characteristic of the support vector machine, and a fault judgment is made with the combination of temperature, motor power, rotation speed and other auxiliary characteristics.

The invention discloses a mobile terminal motor automatic detection method and system. The method comprises the following steps: pre-storing various vibration frequencies of a motor; when receiving a motor automatic detection instruction, starting a motor and controlling the motor to work according to the preset vibration frequencies in sequence; meanwhile, starting an acceleration sensor, continuously obtaining acceleration speed of a mobile terminal and time when the acceleration speed is obtained to obtain acceleration speed change frequency; and judging whether the obtained acceleration speed change frequency is same with the motor vibration frequency set currently, if so, reminding that the motor works normally under such vibration frequency, or otherwise, reminding that the motor works abnormally under the vibration frequency. A new function is added to the mobile terminal: the motor automatic detection function is added to the mobile terminal, so that whether the motor works normally is judged automatically and more accurately instead of manually before the mobile terminal leaves a factory; meanwhile, automatic detection of whether the motor works normally is triggered by corresponding command in the use process of the mobile terminal; and convenience is provided for the user.