26 results about "Rotor eccentricity" patented technology

A lateral–vertical dynamics coordinated control method for a distributed drive electric vehicle, and a related device. The lateral–vertical dynamics coordinated control method for a distributed drive electric vehicle comprises the following steps: creating a fourteen-degree-of-freedom full vehicle model which considers unbalanced magnetic force in an in-wheel motor, so as to accurately represent a state response of a vehicle under different inputs; a three-dimensional piecewise affine tire model performing piecewise linearization of a lateral force of a tire under different side slip angles and vertical loads, so that nonlinear features of the tire can be described under extreme operating conditions; creating an active front-wheel steering controller on the basis of hybrid model predictive control, obtaining a reference center of mass side slip angle and a yaw rate by means of a bicycle model, and then calculating an additional steering angle of the vehicle, thereby ensuring vehicle stability; and designing a multi-constraint input and multi-constraint output active suspension controller based on dual-model predictive control by using roll stability and ride comfort, that is, a tire dynamic load, a vehicle body acceleration, and an in-wheel motor stator-rotor eccentricity, as suspension design control targets.

The invention relates to the technical field of drilling equipment, and discloses a cluster hollow coring device based on a small-diameter motor, the cluster hollow coring device comprises a drill bit, a plurality of screw motors, a slurry pump, a plurality of cardan shafts, a reversing assembly and a transmission shaft, the plurality of screw motors are distributed around the axis of the drill bit at intervals; the slurry pump is communicated with all the screw motors and is used for conveying drilling fluid to all the screw motors; each universal shaft is connected with an output shaft of the corresponding screw motor; the reversing assembly is connected with all the universal shafts; the transmission shaft is connected with the drill and the reversing assembly. The reversing assembly is used for converting output power of the multiple screw motors into input power of the transmission shaft. A single large-diameter screw motor is replaced by a plurality of small-diameter screw motors, and the rotor core shift distance of the small-diameter screw motor is smaller, so that the core shift vibration generated during working is reduced, the wear degree of the rotor can be effectively reduced, the failure of a pressure chamber of the motor is avoided, and the service life is prolonged.

Eccentricity measuring system designed to be applied to a motor system comprising a stator and a rotor, and measuring an eccentricity of the rotor, wherein the eccentricity measuring system comprises: an eccentricity measuring element designed to detect the presence or absence of rotor eccentricity by measuring a change in the magnetic field generated between the rotor and the stator; and a sensor housing, comprising: a first surface in which the eccentricity measuring element is embedded, and a central hole through the center of the sensor housing, so that a rotating shaft of the rotor is fitted into the central hole, the first surface faces a distal end of the rotor.

The application provides a rotor eccentric fault diagnosis method and device based on MCU and a vehicle, and the method comprises the following steps: in response to a control instruction, a motor is controlled to operate at a constant rotating speed; a rotating speed signal of the motor is acquired through a position sensor; a rotating speed ripple is extracted according to the rotating speed signal of the motor; a rotating speed ripple amplitude is calculated based on the rotating speed ripple; a rotor eccentricity is acquired according to the rotating speed ripple amplitude; and a diagnosis result is obtained according to the rotor eccentricity. The method can solve the problem that the rotor eccentric fault diagnosis methods commonly used at present, such as current spectrum analysis and back electromotive force analysis, are difficult to apply to the new energy vehicle electric drive system of the embedded permanent magnet synchronous motor using a distributed winding, can effectively diagnose the rotor eccentric fault in real time, and can be directly applied in the vehicle system without additional offline calculation, and is more convenient and fast.

This invention discloses a permanent magnet electromagnetic levitation steam turbine generator, relating to the field of generator sets. It includes a base plate, a generator set base, a stator block, stator coils, magnetic pole windings, and end shafts. The generator set base is fixedly mounted on the upper end of the base plate. The permanent magnet electromagnetic levitation steam turbine generator of this invention allows the rotor to be in a levitation state, completely avoiding the mechanical friction of traditional rotor bearing pressure structures. Once a displacement sensor detects a deviation, the position of the magnetic levitation structure can be finely adjusted by adjusting the screw or changing the current in the conductive coil, achieving overall dynamic adjustment of the magnetic levitation structure. This ensures that the rotor eccentricity meets power generation requirements. The threaded fit between the adjusting screw and the screw seat allows for independent adjustment of the local position of the support ring. The rotor magnetic partition and the levitation magnetic partition isolate the generator's magnetic field from the detection mechanism, preventing mutual interference. The cooperation between the anti-detachment rod and the anti-detachment sleeve provides temporary mechanical support in case of unexpected failure of the magnetic levitation system.

Eccentricity measuring system applied to a motor system comprising a stator and a rotor, and measuring the eccentricity of the rotor, wherein the eccentricity measuring system comprises: an eccentricity measuring element that measures the presence or absence of rotor eccentricity by measuring a change in the magnetic field generated between the rotor and the stator, wherein the eccentricity measuring element comprises one or more eccentricity measuring sensors; and a detection housing that includes: a surface in which the eccentricity measuring element is embedded; and a central hole formed by the center of the sensor housing, wherein a rotating shaft of the rotor is fitted into the central hole, wherein the eccentricity measuring element is coupled to a front surface of the sensing housing and comprises a sensing board arranged on a surface of the eccentricity measuring element, such that the one or more eccentricity measuring sensors are embedded in the sensing board, and wherein the one or more eccentricity measurement sensors comprise a sensing port extending in an axial direction and electrically connected to the sensing board.

The invention discloses a high-pressure compressor standard rotor eccentricity vector measurement method and system based on installation error compensation, belongs to the field of high-pressure compressor standard rotor eccentricity measurement, and solves the problem that a component centroid reference system and a rotary table measurement reference system cannot be completely consistent in high-pressure compressor standard rotor measurement. The method includes the steps that contour data of the lower end face and the upper end face of a component relative to a rotary table plane are collected, and inclination errors of the lower end face and the upper end face relative to the rotary table plane are obtained through fitting; obtaining the posture of the upper end face relative to the lower end face; establishing a geometric relation model of the height and the inclination amount of the part, calculating the eccentricity introduced by inclination of the lower end surface, and determining the perpendicularity and the perpendicularity phase of the lower end surface; and compensating an error between the centroid reference system and the rotary table measurement reference system according to the eccentricity introduced by inclination of the lower end face, the perpendicularity of the lower end face and the perpendicularity phase to obtain an eccentric vector measurement result. The method is suitable for the precision detection scene of the standard rotor of the high-pressure compressor of the aero-engine.

The invention relates to the technical field of generator set rotor eccentricity measurement, in particular to a generator set rotor eccentricity online measurement method and system, and the method comprises the steps: arranging two displacement sensors on an outer side section and a midspan monitoring section of a rotor bearing respectively to form a double-section measurement array; synchronously acquiring gap signals of the sensors and converting the gap signals into effective physical gap values; respectively resolving to obtain a common-mode motion coordinate at the bearing and an original comprehensive motion coordinate at the midspan; correcting the common-mode motion coordinate by using a shafting transfer function model established through system identification in advance, and predicting a transfer component of the common-mode motion coordinate in a midspan section; deducting the transmission component from the original comprehensive motion coordinate to obtain a pure rotor dynamic eccentricity coordinate; and finally synthesizing the total eccentricity and carrying out intelligent early warning. According to the invention, the high-precision online measurement of the eccentricity of the rotor is realized, the interference of common-mode motion such as shaft neck swing is effectively eliminated, and the measurement result is accurate and reliable.

Eccentricity measuring system applied to a motor system comprising a stator and a rotor, and measuring the eccentricity of the rotor, wherein the eccentricity measuring system comprises: an eccentricity measuring sensor adapted to a pole shoe of the stator and designed to measure the presence or absence of rotor eccentricity by measuring a change in the magnetic field generated between the rotor and the stator; a first detection connection which is formed integrally with a connection arrangement of the stator and is designed to transmit detection information from the eccentricity measuring sensor to the outside; a second sensing port having a surface adjacent to an axial distal end face of the stator, wherein the second sensing port is configured to transmit sensing information from the eccentricity measuring sensor to the first sensing port; and a connecting substrate designed to electrically connect the first detection port and the second detection port.

The application belongs to the field of quantitative characterization of eccentric fault of rotating machinery, and particularly relates to a method for constructing a motor rotor eccentric quantitative characterization model and application thereof, comprising: establishing a motor mathematical model, generating motor data under different motor eccentricities, and obtaining a model labeled sample set; sampling to construct an actual unlabeled sample set of an actual motor; training an approximate characterization model on the labeled sample set; and performing adversarial training on the approximate characterization model and a data discriminator using the unlabeled sample set and motor data corresponding to the model characterization of the motor in a normal state in the labeled sample set to correct the approximate characterization model; wherein, when constructing a static eccentric quantitative characterization model, the motor data is the back-EMF fundamental wave amplitude of each phase winding, and when constructing a dynamic eccentric quantitative characterization model, the motor data is the back-EMF harmonic amplitude of each phase winding. The method can realize quantitative characterization of motor rotor eccentricity by using a neural network even when there is no data under eccentric fault conditions.

The invention discloses a thermally-induced rigidity-variable high-performance mounting bracket and a control method thereof, relates to the technical field of vibration reduction equipment, and aims to solve the technical problem that an existing vehicle-mounted motor vibration reduction bracket cannot be adaptively adjusted along with temperature change. Through the TiNiNb shape memory alloy pull column, temperature self-adaption rigidity switching, low-temperature rigidity fixing impact resistance and normal-high-temperature flexible vibration reduction are achieved, and vibration characteristics of different temperature ranges of the motor are adapted; the vibration buffering gasket is matched with the air damping mechanism to form double vibration reduction, and the high-frequency broadband vibration attenuation effect is greatly improved through the triple damping effect; the ventilation air bag realizes forced air circulation by means of motor vibration, vibration reduction heat is quickly discharged, and high-temperature vibration reduction stability is guaranteed; the vibration wave mechanism is matched with the one-way shaft ring, vibration is converted into reverse rotation force of the radial vibration buffering ring, eccentric radial vibration force of the rotor is counteracted from the source, and accurate radial vibration reduction is achieved.

The present application relates to the technical field of generator set rotor eccentricity measurement, in particular to a kind of generator set rotor eccentricity online measurement method and system, two displacement sensors are respectively arranged in the cross section of the outside of rotor bearing and the cross section of across, to form double cross section measurement array;Synchronously collect the gap signal of each sensor and convert into effective physical gap value;Respectively solve to obtain the common mode motion coordinates of bearing and the original comprehensive motion coordinates of across;Using the shafting transfer function model established by system identification in advance, the common mode motion coordinates are corrected, and the transfer component in the cross section of across is predicted;Subtract the transfer component from the original comprehensive motion coordinates, obtain the pure rotor dynamic eccentricity coordinates;Finally, the total eccentricity is synthesized and intelligent early warning is carried out.The present application realizes the high-precision online measurement of rotor eccentricity, effectively eliminates the interference of shaft neck wobble and other common mode motion, and the measurement result is accurate and reliable.

This utility model relates to the field of automotive starter motor housing technology, and more particularly to an automotive starter motor housing with a shock-resistant structure. It includes a base and a fixed housing, with the fixed housing fixedly connected to the base. The housing also includes a damping rubber layer, an annular honeycomb mounting bracket, a starter motor, a motor end cap, and fixing bolts. The fixed housing is filled with a damping rubber layer, and the annular honeycomb mounting bracket is disposed inside the damping rubber layer. The starter motor is installed inside the annular honeycomb mounting bracket. When vibrations generated by the engine are transmitted to the starter motor, the annular honeycomb mounting bracket compresses the damping rubber layer, which converts the mechanical energy of the vibration into heat energy for dissipation. This prevents problems such as brush wear and rotor eccentricity caused by high-frequency vibrations in the engine compartment. When the vehicle travels over rough roads, the floor plate compresses the damping shock absorber, causing it to compress and deform, thus isolating and protecting the starter motor and preventing damage to the connection between the starter motor and the vehicle frame when the vehicle travels over rough roads.

The invention relates to the technical field of fault diagnosis, and particularly discloses a rotor eccentricity fault detection method and system based on inductance symmetry analysis, and the method comprises the steps: obtaining motor winding structure parameters; mapping to obtain a three-phase inductance initial value under the star-shaped equivalent model; reconstructing the instantaneous equivalent inductance of the three-phase winding; constructing an inductance symmetry deviation factor based on the three-phase reconstruction inductance value; rotor eccentricity type recognition is executed based on the eccentricity judgment template; and outputting an eccentric identification result. In the prior art, winding structure differences are ignored, and eccentric characteristics are extracted directly based on current and voltage waveforms, and the technical problem that cross-model motors under different topological structures are difficult to use in a scene facing star-shaped, triangular or multi-layer lap winding structures is solved. According to the method, the inductance equivalent transformation model for different winding topologies is constructed, and the inductance symmetry deviation factor and the eccentric template matching identification mechanism are combined, so that the universality of eccentric fault detection is improved.

The invention provides a brushless motor torque real-time analysis method, which comprises the following steps: scanning each position of a stator and a rotor of a brushless motor, and acquiring the air gap length, the unilateral magnetic pull distribution and the torque fluctuation amplitude of each position to obtain the real-time air gap non-uniformity degree and the magnetic field distortion degree; according to the obtained real-time air gap non-uniformity degree and the magnetic field distortion degree, rotor eccentricity influence is classified and recognized, and the eccentricity compensation amount of each position is obtained through evaluation; analyzing the obtained eccentric compensation amount of each position, identifying a torque fluctuation amplitude, and filtering to obtain a filtered torque signal; according to the filtered torque signal, dynamically compensating and adjusting the air gap length and the unilateral magnetic pulling force distribution of each position to obtain the adjusted magnetic field action intensity distribution; and performing correction mapping on non-uniform magnetic pulling force caused by non-uniform air gap distribution through the adjusted magnetic field action intensity distribution to obtain correction magnetic pulling force of each position.

Eccentricity measuring system applied to a motor system comprising a stator and a rotor, and measuring the eccentricity of the rotor, wherein the eccentricity measuring system comprises: an eccentricity measuring sensor adapted to a pole shoe of the stator and designed to measure the presence or absence of rotor eccentricity by measuring a change in the magnetic field generated between the rotor and the stator; a data acquisition port configured to transmit data acquisition information from the eccentricity measurement sensor to an external device; and a connecting substrate designed to electrically connect the sensing port and the eccentricity measurement sensor.

The invention discloses a multi-mode double-five-phase permanent magnet synchronous motor torque ripple suppression fault-tolerant control method, which belongs to the technical field of multi-phase motor open-circuit fault fault-tolerant control, and comprises the following steps: establishing a mathematical model under rotor eccentricity and single-phase open-circuit fault, and analyzing flux linkage imbalance characteristics caused by rotor eccentricity; an unbalanced flux linkage component is introduced, the influence of rotor eccentricity on the torque is quantified, and a second harmonic component in torque pulsation is deduced; according to three different working modes of the motor, a second harmonic current injection instruction is deduced based on a torque ripple suppression target; calculating harmonic current parameters by measuring back electromotive force data in an off-line manner, and integrating the harmonic current parameters into a fault-tolerant control framework; a switching signal is generated by adopting carrier-based pulse width modulation, and torque ripple suppression under a fault is realized. According to the invention, the torque ripple under the combined action of rotor eccentricity and open-circuit fault is effectively inhibited, and the operation stability and reliability of the motor are improved.

This invention relates to the field of motor fault diagnosis technology, specifically to a method and system for identifying generator rotor flux and inter-turn short circuit faults. The method involves parallel acquisition of multi-channel raw flux waveforms using the key phase signal as a synchronization reference; normalization of the waveforms based on operating conditions; extracting waveform segments from each magnetic pole based on the key phase signal and subtracting them point-by-point from a health benchmark to obtain a differential flux sequence; extracting three features to form a feature vector; accurately identifying inter-turn short circuits, rotor eccentricity, and health status using a pre-trained fuzzy logic classifier; and outputting the faulty magnetic pole number or eccentricity direction and degree; further calculating the depth and width of the dip to assess the severity of the short circuit; and inferring the slot number range where the short circuit is located based on the waveform dip boundary. This invention effectively suppresses operating condition interference, achieves reliable differentiation between inter-turn short circuits and eccentricity faults, and can accurately locate the magnetic pole or even the slot region, providing highly sensitive early warning and decision-making basis for generator condition-based maintenance.

The application relates to the technical field of motor fault diagnosis, in particular to a generator rotor magnetic flux and inter-turn short circuit fault identification method and system, which adopts a key phase signal as a synchronous reference to collect multiple-channel original magnetic flux waveforms in parallel; the waveforms are subjected to working condition normalization processing; the waveform segments of each magnetic pole are intercepted based on the key phase signal, and a differential magnetic flux sequence is obtained by point-by-point difference with a healthy reference; three features are extracted to form a feature vector, a pre-trained fuzzy logic classifier is used to accurately distinguish inter-turn short circuit, rotor eccentricity and a healthy state, and the fault magnetic pole number or the eccentricity direction and degree are output; the recess depth and width are further calculated to evaluate the short circuit severity level, and the slot number range where the short circuit occurs is inversely deduced according to the waveform recess boundary. The application effectively suppresses working condition interference, realizes reliable differentiation of inter-turn short circuit and eccentricity faults, can accurately locate to a magnetic pole or even a slot area, and provides high-sensitivity early warning and decision basis for generator state maintenance.

The utility model belongs to the technical field of electric equipment fault detection, particularly relates to an electric equipment fault detection device, and aims to solve the problems that the detection mode adopted by the conventional detection device is relatively traditional, for example, whether a motor rotor is eccentric or not is detected by a handheld detection device, and the operation is complicated. According to the technical scheme, the device comprises a working plate, four supporting legs are arranged at the bottom of the working plate, a circular groove is formed in the top of the working plate, a vertical shaft is rotationally installed in the center of the circular groove, and a circular plate is installed at the top end of the vertical shaft; the four supporting structures are used for placing motors and are rotationally mounted at the top of the circular plate; and the rotating mechanism is mounted at the bottom of the working plate, and the vertical shaft is matched with the rotating mechanism. According to the utility model, the structure is simple, the motor can be detected through the ultrasonic detector, the motor can be automatically adjusted by 360 degrees, and the purpose of automatic detection is achieved.

The application discloses a three-loop suspension control method of a bearingless motor based on eccentricity compensation. In view of the problem that the rotor of the bearingless motor is prone to oscillation and difficult to be stably suspended, eccentricity compensation is introduced to inhibit positive feedback generated by rotor eccentricity. In view of the problem of large overshoot in the radial displacement adjustment process, a radial velocity loop is introduced on the basis of traditional displacement current double-loop suspension control, so that when the displacement error is zero, the given value and the actual radial velocity are both zero, and the rotor can move to the given position without overshoot and oscillation. By introducing the eccentricity compensation and the radial velocity control, the bearingless motor which is complex and difficult to control can be equivalent to a traditional servo motor, the design difficulty of the controller parameters is reduced, and the stability of the suspension control system is improved.

The utility model provides a side flow pipe of multistage sliding vane pump, including a plurality of mutually detachable connection pump body, the pump body includes the first-stage pump body, at least one intermediate-stage pump body and last-stage pump body that are connected in order, and the first-stage pump body, the at least one intermediate-stage pump body and the last-stage pump body are mutually independent and are all equipped with rotors equipped with sliding vanes, the rotors are sleeved with eccentric parts, and the eccentric parts are connected with the first-stage pump body and the at least one intermediate-stage pump body and the last-stage pump body. The inner wall of the eccentric part and the rotor are eccentrically arranged and form an eccentric cavity, the eccentric part is wrapped with a grading pump shell, an annular pump cavity is formed between the grading pump shell and the eccentric part, the eccentric part is provided with a plurality of flow distribution holes communicating the pump cavity with the eccentric cavity, side flow pipes are arranged outside the adjacent pump bodies, and the side flow pipes communicate with the pump cavities of the adjacent pump bodies correspondingly; the through-flow area of the side flow pipe is far larger than that of an interstage hole, local resistance of fluid transmission is reduced, and the transmission efficiency is improved; fluid does not directly wash the inner wall of the pump shell, damage of axial thrust to pump body connection is avoided, and the service life of the pump body is prolonged; the bending part of the side flow pipe realizes smooth steering of fluid, kinetic energy loss is reduced, and overall energy consumption is reduced.

Eccentricity measuring system applied to a motor system comprising a stator and a rotor, and measuring the eccentricity of the rotor, wherein the eccentricity measuring system comprises: an eccentricity measuring sensor adapted to a pole shoe of the stator and configured to measure the presence or absence of rotor eccentricity by measuring a change in the magnetic field generated between the rotor and the stator; and a data acquisition port configured to transmit data acquisition information from the eccentricity measurement sensor to an external device, wherein an electrode pattern electrically connected to the eccentricity measurement sensor is inserted into the sensing port.

The invention discloses a digital monitoring system for a driving motor for logistics equipment. The digital monitoring system comprises a data acquisition layer, an edge computing layer and a cloud platform application layer, and the data acquisition layer comprises sensor modules and protocol adapters which are deployed on a plurality of logistics equipment driving motors. According to the system-level cooperative monitoring, an information island monitored by a single motor is broken, centralized and unified management and cooperative state analysis of all driving motors in the logistics system are realized, and the overall reliability and operation consistency of the system are improved; intelligent predictive maintenance: data value is deeply mined through a cloud AI model, potential faults such as bearing wear, rotor eccentricity and insulation aging can be pre-warned in advance, passive maintenance is changed into active prevention, and non-planned downtime and maintenance cost are greatly reduced.

The application provides an SVPWM sector compensation method and system for high-frequency electromagnetic vibration of a permanent magnet motor, and belongs to the field of motor driving control. The method comprises the following steps: obtaining rotor eccentricity parameters of the permanent magnet motor; establishing an air gap permeance-electromagnetic force mapping model; constructing a voltage space compensation function based on the air gap permeance-electromagnetic force mapping model; calling the voltage space compensation function to calculate real-time compensation coefficients of the current sector according to the real-time rotor position angle; dynamically correcting the action time of the basic non-zero voltage vector in the current SVPWM cycle by using the real-time compensation coefficients; and generating and outputting a PWM driving signal according to the corrected time, so as to suppress the high-frequency electromagnetic vibration generated by the coupling of rotor eccentricity and frequency converter switching harmonics. The application can effectively suppress the high-frequency electromagnetic vibration under the full eccentricity working condition of the rotor, has high robustness, and is suitable for permanent magnet synchronous motors controlled by various frequency converters.

The application provides a rotor eccentricity detection method and system based on modal resonance for a permanent magnet motor, and belongs to the field of permanent magnet motor eccentricity fault detection. The method comprises the following steps: obtaining the motor operating state and collecting the structural response signal; establishing a modal database to obtain the natural frequency and frequency band range of each order modal; constructing an air gap permeance modulation model to obtain an eccentricity candidate feature set through two-dimensional Fourier decomposition; performing frequency spectrum analysis on the structural response signal to obtain a power spectrum, and calculating a frequency band enhancement feature quantity in the modal frequency band; matching the eccentricity candidate feature set and the frequency band enhancement feature quantity, judging whether there is eccentricity through a preset eccentricity determination rule, and outputting the eccentricity type and eccentricity degree evaluation result. The application improves the observability and anti-interference ability of the eccentricity feature under complex working conditions, and realizes high-sensitivity, high-robustness and mechanism-explained detection and evaluation of the rotor eccentricity fault.