115 results about "Motor dynamics" patented technology

The invention discloses a measuring system of state of charge of motor dynamic cell, in order to conquer the problem that it is difficult to obtain internal parameter of cell, and it is difficult to test and mould, and the measurement can not be accurately performed. The measuring system comprises a data collecting part and data central processing and conveying part. The data collecting part comprises voltage sensor, current sensor and temperature sensor. The data central processing and conveying part is composed of data processing unit and CAN conveying unit. The data processing unit uses digital signal processor with blur prediction algorithm, wherein the CAN conveying unit comprises CAN bus transceiver and CAN bus. One end of the CAN bus transceiver is electrically connected with the CAN controller of digital signal processor and the other end of the CAN bus transceiver is electrically connected with the CAN bus and the CAN bus is electrically connected with the electric control unit of motor or main control computer. The invention can be applied for cell testing and administering field of electric automobile, hybrid dynamic motor and other products.

The invention relates to a tri-level inversion indirect vector control system based on simplified SVPWM (space vector pulse width modulation). On bases of the SVPWM simplification algorithm under a 60-degree coordinate system, an asynchronous motor dynamic mathematical model, a vector control fundamental principle and a main circuit in the step A, the tri-level inverter vector control system based on network parameter control (NPC) is established. The method dispenses with judgment that a reference voltage vector is in a large section or a small section, as well as a great deal of trigonometric functional operation, and only requires simple logical judgment, so that nearest three vectors for synthesizing the reference voltage vector can be obtained; and meanwhile, an output switch state equation is introduced in the algorithm, so that midpoint electric potential balance on the direct current side can be effectively controlled, and the method can be easily popularized to inverters with higher level.

The invention discloses an oil pumping unit motor dynamic load simulated loading system and an oil pumping unit motor dynamic load simulated loading method in the technical field of motor dynamic load simulated test. The system comprises a torque meter, a belt pulley and gearbox module, an oil pumping unit four-bar mechanism module, a downhole load module, a four-quadrant frequency converter and a load motor, all of which are connected in sequence. The method comprises the steps of determining the optimal equivalent balance weight and downhole friction according to a measured motor load torque and a simulated motor load torque, calculating the crank driving moment according to the determined equivalent balance weight and the determined downhole friction, converting the crank driving moment into the motor load torque, generating a motor load torque driving instruction, and sending the instruction to the load motor. No transformation of a standard well is needed, the construction cost of a testing system is saved, the difference of frequency converters or servo motors does not need to be considered, and the system and the method are highly universal.

The invention provides a vehicle electric wheel multifunctional testing table and belongs to the technical field of electric vehicles. The testing table comprises a power supply module, a testing table frame body, a vertical loading system, a steering system and a rolling drum system. The power supply module is respectively connected with the vertical loading system, the steering system and the rolling drum system and provides power for the systems. The testing table frame body is constructed as a testing table body frame which provides supporting for the vertical loading system and the steering system. The vertical loading system and the steering system are both placed on the testing table frame body and load vertical force and steering force on an electric wheel respectively. The rolling drum system is separated from the testing table frame body and is used for simulating road conditions and vehicle rotational inertia. According to the vehicle electric wheel multifunctional testing table, testing and evaluation can be carried out on relationship of tyre force and slip ratio, driving anti-slip performance, slip ratio control performance under hydraulic braking, motor durability, motor dynamic performance and the like of an electric wheel system under large side force, and meanwhile the vehicle electric wheel multifunctional testing table is suitable for multifunctional testing of a traditional tyre beyond motor performance testing.

The invention discloses a method and a system for controlling dynamic overload automatic load reduction of motor driving. The method comprises the steps of acquiring a rated value of a physical variable used for describing motor driving overload, an overload multiple, the overload time, an actual measurement value and the motor running time; determining an overload accumulative threshold value of the physical variable according to the acquired rated value, the overload multiple and the overload time, and determining an overload accumulative value of the physical variable according to the acquired rated value, the actual measurement value and the motor running time; carrying out closed-loop adjustment on the physical variable when the overload accumulative value is greater than the overload threshold value so as to enable a current actual measurement value to be less than or equal to the rated value. According to the invention, automatic load reduction in motor driving overload is realized, thereby avoiding a circumstance of equipment downtime or damages caused by motor dynamic overload.

The invention discloses a method for identifying parameters of a dual-motor drive belt conveyer energy consumption model. The method includes the following steps: S10, establishing a coal mine dual-motor drive belt conveyer energy consumption model according to an energy consumption model based on a single-motor dynamic model; S20, performing parameter identification on rotating speed of the motorand load torque according to motor operation parameters of the motor after a load is applied; and S30, identifying energy consumption parameters of the dual motor drive belt conveyer according to theidentified rotating speed and load torque parameter values. The rotating speed of the motor and the load torque are identified first, the identified rotating speed value and load torque value are substituted into the energy consumption model, the problem of identification precision reduction caused by a measuring error brought by adoption of a rotating speed sensor and a torquemeter is avoided, and an identification result is closer to the reality and more accurate.

The invention discloses a motor test spacer-bush-type coupling and a dismounting method thereof, wherein the coupling comprises an inner spacer bush (1) sleeved on a motor rotary shaft (7), a pressing ring (6), an outer shaft sleeve (2) sleeved on the inner spacer bush (1) and at least six M20 bolts (3); the excircle at the larger end of the inner spacer bush (1) is connected with a female end of the pressing ring (6); and each bolt is connected with the outer shaft sleeve (2) and the motor rotary shaft (7) through a spring washer (4), a flat washer (5) and bolt holes on the pressing ring (6). The dismounting method of the coupling comprises the mounting of the motor test spacer-bush-type coupling and the dismounting of the dismounting of the motor test spacer-bush-type coupling. The coupling provided by the invention has the advantages of simple structure, low cost, short time of dismounting, high production efficiency, and is safe and reliable in use; and after the coupling is used, the motor shaft extension and the inner spacer bush of the coupling can not cause the problems of dimension deformation and surface damage and the like, the motor shaft extension is not damaged, the service life of the inner spacer bush is prolonged, and the motor dynamic balance is not influenced and the like.

A system to control the fixed mass/spring mechanical resonance of the motor in conjunction with a model of the motor that estimates the present position and allows the determination of the motor stator voltage pattern which will produce the requested output force. This approach effectively eliminates the electrical restoring force from the motor dynamics and minimizes the problems associated with the varying resonant frequency of the motor.

The invention provides a method and system for an electric lifting table to retract while meeting resistance based on self-learning, a lifting device and a medium. The system comprises a self-learningapparatus and an apparatus for retracting while meeting resistance. The self-learning apparatus obtains a parameter characteristic value of a lifting component, and obtains a tightness degree changearea according to the parameter characteristic value; and the apparatus for retracting while meeting resistance obtains a motor dynamic parameter value, corrects the motor dynamic parameter value in the tightness degree change area to obtain a corrected motor dynamic parameter value, and executes retraction while meeting resistance according to the corrected motor dynamic parameter value. By adoption of a self-learning algorithm, the interference of the motor dynamic parameter value caused by the consistency difference of the lifting component is eliminated, the consistency deviation of the lifting component caused by production process and fatigue after multiple times of use can be eliminated, and the wrong trigger of retraction while meeting resistance is avoided from the root cause, sothat the sensitivity of the retraction while meeting resistance and the usability of the function of retraction while meeting resistance are greatly improved, the production consistency requirements of the lifting component are reduced, and the production cost of the lifting component is reduced.

The invention provides a double-motor dynamic suspension system of a rehabilitation robot. The upper end of an upright post is fixedly connected with an upper support plate and a suspension plate. Anupper sliding block and a lower sliding block are connected to two vertical plain shafts in a sleeving mode and are connected with each other through two springs. The lower sliding block is driven bya power source to move axially along the plain shafts. The upper surface of the upper sliding block is provided with a movable pulley. One end of a rope is wound around a winch, and the other end passes through the movable pulley and then is connected to a patient after changing direction through a fixed pulley installed on the suspension plate. A damping block limits the up-and-down movement of the upper sliding block. A proximity sensor is installed on the lower surface of the suspension plate to monitor the distance between the patient and the suspension plate. A tension sensor is installedbetween the fixed pulley and the suspension plate. By the adoption of the system, accurate adjustment of the two parameters, height and force, can be achieved at the same time. The system is stable and does not shake.

A control method for an haptic device is provided with particular attention to motor control amplifiers exploiting the inate motor dynamics of DC motors. The control method encompasses a digital and analog circuit. In the digital circuit, a command voltage is determined by a digital controller utilizing sensed motion information of the haptic device and a motion command signal. In the analog circuit, an amplifier applies a voltage to an electrical DC motor. The applied voltage incorporates the determined command voltage from the digital controller and a voltage to reduce the electrical dynamics of the electrical DC motor.

The invention belongs to the air-conditioner control technical field and discloses an identification control method of the rotational inertia of a motor. With the method adopted, problems in automatic acquisition of the rotational inertia of a variable frequency motor can be solved. According to the method, the accelerated velocity and acceleration time of motor rotation velocity in two stages are controlled; motor d/q-axis current corresponding to each fluctuation period of a load torque in each stage is sampled according to the periodicity of the fluctuation of the load torque of the rotor of the motor; and the rotational inertia of the motor is obtained according to the relations of the motor torque and the current, and a motor dynamic equation model. The method of the invention is suitable for determining the rotational inertia of the motor of an air conditioner.

The invention relates to a method for controlling an autonomous rendezvous between spacecrafts under action of impulse thrust, which belongs to the technical field of aerospace, and aims to solve the problem that a traditional method for controlling the rendezvous between the spacecrafts under the action of the impulse thrust is easy to be influenced by a disturbance moment because of adopting anopen-loop control mode. The method for controlling the autonomous rendezvous between the spacecrafts under the action of the impulse thrust comprises the following steps: establishing a kinetic modelof the relative motion between the spacecrafts, and converting a state space model of the relative motion into a discrete motion model; introducing state feedback control rate in the impulse action process; introducing virtual energy functions for a impulse action motion and a free motion; determining three inequalities meeting the requirement that the spacecrafts realize the autonomous rendezvous, satisfying a finite impulse thrust inequality, and converting the inequalities into linear matrix inequalities related with X1,X2 and Y1; and calculating a state feedback gain matrix K according tothe worked-out X1 and Y1 matrixes to obtain a state feedback sampling control law u(k)=Kx(k) of the relative motion between the spacecrafts, which meets the design requirement. The method for controlling the autonomous rendezvous between the spacecrafts under the action of the impulse thrust is suitable for the autonomous rendezvous process of the spacecrafts.

The invention relates to a test apparatus used for unmanned aerial vehicle motor dynamic tension and torsion. The test apparatus comprises a transition assembly, a tension test assembly and a torsion test assembly, wherein the transition assembly comprises a test shaft and a sleeve, and one end of the test shaft is mutually rotationally connected with a housing of a motor through the sleeve; the tension test assembly comprises a first tension meter, the first tension meter is connected with the other end of the test shaft, and the first tension meter detects an axial force of the test shaft; and the torsion test assembly comprises a second tension meter, a drag rope and a roller, and the drag rope, after being led out from the circumferential direction of the test shaft, is led to the second tension meter through the roller. According to the invention, tension generated by a rotor motor can be accurately measured in real time, and the motor torsion can also be simultaneously measured in real time; and through arrangement of the torsion test assembly, the drag rope is enabled to overcome the torsion to balance rotation forces of blades, the test shaft is enabled to maintain still, it is ensured that the first tension meter does not jitter when the tension is tested, and the test accuracy is improved.

The invention discloses a permanent magnet synchronous motor (PMSM) fractional order variable structure model considering iron loss and an identification method. According to the invention, the integer-order inductance of a traditional motor equivalent circuit model is extended to the fractional order inductance, and with the addition of a fractional order parameter, the model gains more degrees of freedom and greater flexibility; and meanwhile, the iron core loss is introduced into the model so that the model for the research on the motor efficiency optimization is more accurate. In the invention, the model variable structure is realized through the switching control between the two models, therefore, the accuracy of the model is higher, the practicality and accuracy of the model are balanced, the multiple demands of the motor dynamic response and efficiency optimization are satisfied, and a high application value is gained.

The invention discloses a doubly-fed wind motor dynamic equivalence method based on similarity homology. The method comprises the following steps of stepS10, using a prony algorithm to fit the outputpower of doubly-fed wind motors to the linear combination of the exponential functions of an amplitude, a phase, a frequency and damping; stepS20, according to the linear combination acquired from thestepS10, using a similarity theory to determine a similar oscillation mode between the doubly-fed wind motors; stepS30, using the similar oscillation mode to define a homology similarity quantification index between the doubly-fed wind motors, and discriminating a homology cluster in a wind power plant; S40, taking active power output by the doubly-fed wind motors as weight and acquiring the equivalent transient internal potential of an equivalent machine, and connecting the equivalent transient internal potential buses of the doubly-fed wind motors of a same group to the equivalent transient internal potential bus of the equivalent machine through a complex transformation ratio phase shifting transformer respectively; and stepS50, calculating the equivalent parameter of each equivalentmachine, and connecting the equivalent transient internal potential bus of the equivalent machine to the equivalent machine through an equivalent doubly-fed wind motor impedance.

The invention discloses a motor on-site dynamic balance correction and vibration detection method, particularly relates to the field of motor dynamic balance correction and detection, and comprises avibration detection device and a vibration detection and dynamic balance correction method. The vibration detection device comprises a base, a display, a detection mechanism, a gradienter and an installation assembly. The upper surface of the base is provided with an embedding groove. The detection mechanism is movably arranged in the embedding groove, the displayer is arranged above the embeddinggroove in a sliding mode, the gradienter is fixedly arranged at the front end of the display, and the installation assembly is arranged on one side of the base and detachably connected with a motor fixing base. According to the invention, the motor main shaft is cleaned firstly, and then the levelness between the device and the motor main shaft is adjusted through the gradienter, so that the detection accuracy of the sensor can be ensured; after the reference block and the motor main shaft are fixed, the reference block is used as a reference point to accurately find the offset distance of the points of the outer ring of the motor, so that when the points correspond to the rotor, high-precision counterweight correction can be performed on the rotor.

The invention discloses a hydraulic balanced motor dynamic sealing device. The dynamic sealing device includes a sealing end cap, an inner sealing seat, an outer sealing seat, O-shaped rings, lubricating grease and insulating hydraulic oil; the upper end of the sealing end cap is fixedly connected to a hydraulic balanced motor; the left side on the lower end of the sealing end cap axially and radially limits the inner sealing seat sleeving a motor shaft; the O-shaped rings are installed on the radial contact surfaces of the inner sealing seat and the motor shaft and the sealing end cap; the right side on the lower end of the sealing end cap axially and radially limits the outer sealing seat sleeving the motor shaft; the outer sealing seat is provided with an outer shaft oil chamber; the outer shaft oil chamber is filled with the lubricating grease; the O-shaped rings are installed on the two ends of the outer shaft oil chamber to perform sealing; the O-shaped rings are installed on theradial contact surface of the outer sealing seat and the sealing end cap to perform sealing; and the outer sealing seat is detachably and fixedly connected to the sealing end cap. The dynamic sealingdevice can simplify the technology steps of replacing the sealing rings, so that the maintenance costs of the motor can be reduced.

The invention discloses a direct current brushless motor simulation device and a control method thereof. The device comprises a motor driver power stage, a load analog inductor, a voltage and currentanalog circuit, a bus capacitor, a DC-DC module, a voltage and current controller, a motor simulator, a circuit opening and closing device, a voltage and current measuring unit and a real motor controller. The device provided by the invention has the characteristics and advantages that 1) a motor dynamic equation is quickly solved through an estimation-correction numerical integration method, which ensures the real-time performance and satisfies the accuracy of motor simulation; 2) a motor model and corresponding starting or loading parameters thereof are freely configured, and direct currentbrushless motors of various different parameters can be simulated without changing circuit components; and 3) the device is compatible with the control methods of sensored and sensorless direct current brushless motors, and provides corresponding physical quantity feedback.

The invention discloses a quad-rotor guaranteed performance quantitative control method considering airborne resource limitation, and relates to the technical field of quad-rotor automatic control. The method comprises the following steps: firstly, establishing a motion/kinetic model which considers control input quantification and can represent strong coupling and strong uncertainty of the quadrotor; secondly, designing a mixed event triggering function based on a fixed threshold value and a relative threshold value, and constructing a mixed event triggering extended state observer for a track and an attitude loop respectively; then, establishing a four-rotor trajectory tracking error conversion model by utilizing a preset performance control principle to ensure that the trajectory tracking performance meets preset transient and steady performance index requirements; further, designing a quad-rotor trajectory loop virtual control law, and generating quad-rotor centroid dynamics virtual control input and an expected course angle instruction through inverse dynamics calculation; and finally, designing a quad-rotor virtual attitude control law. The quadrotor trajectory loop control precision is greatly improved, and finally effective utilization of airborne resources under a guaranteed performance framework is achieved.

A calibration unit, system, and method for calibrating a device under test are provided. The calibration unit, system, and method use a single axis rotational unit to calibrate devices under test on a test head. The single axis rotation unit is configured to extend at an angle from a known axis. The test head can be designed in the shape of a frustum with multiple sides. The calibration unit, system, and method can use combinations of gravitational excitation, Helmholtz coil excitation, and rotational rate excitation for calibrating the device under test. The calibration unit, system, and method can calibrate a 3 degree for freedom or higher MEMS devices.

The invention discloses a heavy haul train sliding mode tracking control method with input saturation. The method comprises the following steps that S1, a longitudinal motion stress condition of a heavy haul train is analyzed, a longitudinal motion kinetic equation for input saturation of the heavy haul train is established, and a train kinetic model is obtained; S2, under the condition of considering input saturation, a novel dynamic auxiliary compensator is designed; S3, the stability of the dynamic auxiliary compensator is verified, and the boundary of a compensation signal is acquired andS4, under the condition of input saturation, an anti-saturation sliding mode controller is designed;S5, the stability of the system is provided to ensure that each carriage of the train stably tracksthe target curve. According to the invention, each carriage has good displacement and speed tracking precision, andthe dynamic auxiliary compensator is designed, so that the range of compensation signals is reduced, and the engineering applicability is enhanced.

The invention discloses a motor dynamic braking circuit and a motor dynamic braking method. After being rectified by a rectifier bridge module, alternating current is converted into direct current busP/N with stable voltage through bus capacitor filtering, and then the direct current is converted into the alternating current through an inverter bridge module to drive the motor; one end of a power-on soft start module is connected to the bus positive P, the other end is connected with one ends of a bus capacitor module and a regenerative braking module, the other ends of the bus capacitor module and the regenerative braking module are connected to the bus negative N, and a dynamic braking module is directly connected to the direct current bus P/N. The dynamic braking circuit completely multiplexes the body diodes of the inverter bridge module to achieve rectification, three additional diodes do not need to be additionally arranged on each axis, the system cost is reduced, and the PCB area is reduced; the dynamic braking module shared by the multi-axis common bus system can be supported without adding any additional wiring, so that the system wiring is simplified, and the cost of wiring terminals and cables is reduced.

The invention belongs to the technical field of motor dynamic balance, and particularly relates to a high-speed motor dynamic balance self-adjusting device. The device comprises a rotating shaft, weight balancing blocks, a fixed plate and a locking piece, wherein the rotating shaft is connected with a self-contained rotating shaft of the motor; the weight balancing blocks are connected with the fixed plate and are locked to the rotating shaft through the locking piece, and the weight balancing blocks are evenly distributed around the rotating shaft in the circumferential direction. The whole weight balancing device is externally arranged outside the motor, so that the dynamic balance of the whole motor can be adjusted anytime and anywhere. The weight required to be balanced is calculated only in the process of running and correcting, and then the weight balancing and locking are carried out on the fixed plate, so that the weight balancing can be rapidly completed. According to the structure, the whole motor is not required to be detached, and a dynamic balance test is carried out independently. Meanwhile, the dynamic balance of the motor during operation is ensured. The weight balancing blocks are convenient to machine and easy to realize standardization. The structure is wide in application range, and can be popularized to other rotary equipment to be used for correcting dynamic balance.

The energy recovery system applies reverse mode voltage on the motor coil when the electric brake system is activated, through synchronous switching controlling the up and down arm MOSFET, with the current flowing back to the source end when the arm closes, to achieve energy recovery. It relies on Gate voltage to switch signal, realizes the controllable reverse torque brake, provide smooth and reliable brake torque, without complex electric frame structure to recover the motor dynamic maximumly.