1180 results about "Synchronous motor" patented technology

The invention relates to a deep integrated electric drive assembly design method and system, and the method comprises the steps: obtaining the parametric modeling data of an electric drive assembly, and carrying out the digital twin synchronous motor modeling, and obtaining a drive three-dimensional model; topological structure data of the electric drive assembly are obtained, and mixed algorithm optimization calculation is carried out on the topological structure data and the drive three-dimensional model to obtain a system optimization solution set; performing model prediction control construction based on the system optimization solution set, and performing gear contour line modification processing on the electric drive assembly to obtain a speed reduction transmission strategy; performing heat dissipation management extraction optimization on the system optimization solution set according to a preset variable cross-section micro-channel heat dissipation algorithm to obtain a dynamic heat dissipation strategy; preliminarily integrating the speed reduction transmission strategy and the dynamic heat dissipation strategy to obtain an initial design scheme; eMI filtering optimization is carried out on the initial design scheme, multi-stage electromagnetic shielding construction is carried out, and a system performance optimization scheme is obtained. The comprehensive performance of the system can be improved through integral design, regulation and control.

The invention relates to the technical field of natural gas treatment, and particularly discloses a turbine and motor double-drive magnetic levitation natural gas expansion recompression unit, system and method, and the turbine and motor double-drive magnetic levitation natural gas expansion recompression unit comprises a natural gas expansion machine, a high-speed synchronous motor and a natural gas compressor which are coaxially and rigidly connected; the magnetic suspension supporting system comprises an expansion side magnetic suspension bearing arranged at the output end of the natural gas expansion machine and a compression side magnetic suspension bearing arranged at the input end of the compressor, and is used for realizing non-contact suspension and torque transmission of the rotor; the electric control unit comprises an electric appliance cabinet and a pressure sensor, a converter and a main controller are arranged in the electric appliance cabinet, the converter is connected with a power grid and the high-speed synchronous motor, and the main controller dynamically adjusts the operation mode and power of the high-speed synchronous motor by taking the outlet pressure of the natural gas compressor as a control variable. The natural gas compressor is driven by the natural gas expansion machine and the highly synchronous motor, the unit with the reverse power generation function is adopted, the operation flexibility of the unit is improved, and the comprehensive utilization rate of energy is remarkably increased.

The invention discloses a bidirectional self-adaptive inertia control method and device for an interconnected converter, and the method comprises a voltage source converter structure, a bidirectional inertia control method and self-adaptive inertia coefficient set.The bidirectional self-adaptive inertia control method and device are suitable for an AC-DC hybrid micro-grid so as to balance AC micro-grid frequency and DC micro-grid voltage dynamic response. Virtual synchronous motor control is adopted as a control outer ring to realize power adjustment and emergency control mode switching, an additional virtual capacitor control ring is designed to suppress the influence of high-frequency interference on a differential element, and the method can enable an IC to adjust a working mode to operate in a rectification or inversion state under a self-adaptive operation condition, so that the reliability of the IC is improved. The strategy enables the interconnection converter to smoothly adapt to three operation modes of grid connection, island power adjustment and island emergency control, thereby balancing the dynamic response characteristics of the two modes after disturbance, and achieving the improvement of the overall performance of the AC / DC micro-grid.

The invention discloses a performance simulation method, system and equipment of a synchronous motor and a medium, and relates to the technical field of motor engineering and simulation technologies. According to the method, electromagnetic parameters are obtained based on a geometric structure, material attributes and current parameters of a motor; according to loss data in the electromagnetic parameters, calculating to obtain a temperature distribution data set of each component in the motor; according to the electromagnetic force and temperature distribution data set in the electromagnetic parameters, calculating stress distribution and deformation of each component in the motor; carrying out fusion processing on the electromagnetic parameters, the temperature distribution data set and the stress distribution to obtain a fusion data set; fusing the data set to obtain an initial multi-physics field coupling model; performing parameter correction on the initial multi-physics field coupling model to generate a synchronous motor multi-physics field coupling model; and performing simulation according to the synchronous motor multi-physics field coupling model to obtain performance simulation data. By implementing the technical scheme, a reliable basis can be provided for design optimization, performance analysis and fault diagnosis of the motor.

A method for controlling a permanent magnet (PM) synchronous motor in an ESP application is provided. A load angle of the PM motor is estimated. A voltage adjustment value is determined for the PM motor based at least on the estimated load angle of the PM motor. A voltage to be applied to the PM motor is determined based on the voltage adjustment value.

The invention relates to the technical field of motor control, and discloses an axial magnetic flux hybrid excitation synchronous motor field weakening control system based on multi-source feedback. According to the system, a motor digital twinborn model is constructed, and real-time operation data are collected by using a multi-source sensor and synchronized to the model; establishing a three-dimensional electromagnetic field state space based on the model, extracting features through a manifold neural operator, and generating a multi-dimensional excitation state feature set; determining an excitation anomaly feature index set according to the feature set distribution density; collecting data in real time, extracting current excitation characteristic parameters, mapping the current excitation characteristic parameters to a three-dimensional electromagnetic field state space, calculating spatial correlation with the abnormal index set, and outputting weak magnetic demand correlation factors; and finally, according to the correlation factor, the feature set and real-time data iteration updating operator parameters, a control instruction is generated to dynamically adjust the coupling proportion of the electrical excitation component and the permanent magnet excitation component. According to the system, comprehensive perception and accurate regulation and control of the motor operation state are realized, and the adaptability and reliability of field weakening control are improved.

The present invention provides a permanent magnet synchronous motor and a variable frequency compressor, which relate to the technical field of compressor design and manufacturing. The permanent magnet synchronous motor includes a stator core and a rotor core arranged inside the stator core; the stator core includes stator teeth uniformly distributed in the circumferential direction, a stator yoke is arranged between two adjacent stator teeth, two adjacent stator teeth and the stator yoke between the two stator teeth form a stator slot, and a winding is embedded in the stator slot; a plurality of uniformly distributed eccentric arcs and straight line segments are arranged in the circumferential direction of the outer edge of the rotor core, uniformly distributed magnetic steel plug holes are arranged inside the rotor core, and a groove is arranged between two adjacent magnetic steel plug holes; a permanent magnet with alternating NS poles is arranged in the magnetic steel plug hole. In the present invention, by limiting the inner diameter Rsi of the stator core, the maximum outer diameter Rro of the rotor core and the axial length Les of the stator core to satisfy: 0.455≤Les / (Rsi+Rro)≤1.264, the torque density of the synchronous motor can be increased and the cost can be reduced.

The present invention belongs to the technical field of parameter identification for permanent-magnet synchronous motors. Disclosed are a parameter identification method and apparatus for a permanent-magnet synchronous motor, and a storage medium and a device. The method comprises: using a variable step-size feedback neural network algorithm to solve a voltage equation and a d-q axis current discrete state equation, which take cross-coupled inductance into consideration, of a permanent-magnet synchronous motor in a dq coordinate system, so as to obtain intermediate parameters generated in the process of constructing the d-q axis current discrete state equation; and performing calculation on the basis of the intermediate parameters, so as to obtain the stator resistance, the d-axis inductance, the q-axis inductance, the cross-coupled inductance and the permanent-magnet flux linkage of the permanent-magnet synchronous motor, and thereby completing parameter identification. The present invention takes cross-coupled inductance into consideration and uses the variable step-size feedback neural network algorithm, such that the computational load is extremely small, the degree of complexity is reduced, rapid and effective identification can be realized, and errors can be reduced; in different convergence time periods, the algorithm adjusts the step size on the basis of the magnitude of steady-state errors, such that identification results approach stable values more quickly, thereby improving the speed and stability of convergence.

The invention relates to the technical field of new energy grid connection, in particular to a new energy grid-connected inverter system based on a double-stator synchronous motor interface, which comprises a three-phase inverter and a double-stator synchronous motor, the double-stator synchronous motor comprises a first stator, a rotor and a second stator. Planar air gaps exist between the rotor and the first stator and between the rotor and the second stator. The rotor comprises a first rotor and a second rotor which are rigidly connected, the first rotor is axially adjacent to the first stator, the second rotor is axially adjacent to the second stator, and a magnetic isolation ring is arranged between the first rotor and the second rotor; each of the first stator and the second stator comprises a stator core and an armature winding, the first rotor comprises a first rotor core, an excitation winding and a starting winding, and the second rotor comprises a second rotor core and a permanent magnet. According to the invention, the double-stator configuration can realize voltage transformation and frequency conversion functions, and can solve the problems of reduced power grid inertia, insufficient short-circuit capacity, aggravated broadband oscillation risk and the like caused by grid connection of large-scale new energy through power electronic equipment.

The invention provides a bus current estimation method and device of a synchronous motor, equipment and a storage medium. The bus current estimation method comprises the steps of obtaining a corresponding three-phase current sampling value of the synchronous motor in a current control period; the target action duration corresponding to each phase of the synchronous motor in the current control period is obtained; wherein the target action duration corresponding to each phase is calculated in the previous control period of the synchronous motor; and according to the current control period, the three-phase current sampling value and the target action duration corresponding to each phase, calculating to obtain the bus current of the synchronous motor in the current control period. Through the mode, the actual action time of each phase corresponds to the corresponding current sampling value, and the bus current is obtained through calculation on the basis, so that the bus current value is accurate, and estimation precision reduction caused by period lag of the algorithm execution time and the action time is avoided.

The invention provides a grid-connected system and method based on parallel operation power equalization of synchronous motor units, and relates to the technical field of new energy and electric power engineering. The system comprises a new energy station power generation system and a parallel synchronous motor unit group, wherein the parallel synchronous motor unit group at least comprises two synchronous motor units which have the same electrical parameters and are connected in parallel; the first end of the parallel synchronous motor unit group is connected with the new energy station power generation system, and the second end is connected with the power grid. The method comprises the following steps: connecting one ends of all synchronous motor units to the same power supply bus, applying excitation current to the motor at the end, applying excitation current to the motor at the other end, then measuring the generator end voltage waveform, adjusting the relative mechanical angles of the synchronous motor units according to the measurement result, and ensuring that the relative mechanical angles of all the motor units are equal. And power equalization between parallel synchronous motor units is realized. The system structure can be simplified, the cost can be reduced, and the reliability and the flexibility of the new energy grid-connected system can be improved.

The invention relates to the technical field of driving control of symmetrical vacuum pressure control valves, in particular to a zero-point-free zero returning method of a double-position synchronous motor for a symmetrical vacuum pressure control valve, which is suitable for scenes needing high-precision pressure control, such as semiconductor manufacturing, vacuum coating, precision vacuum detection and the like. The problems that in the prior art, the vacuum sealing performance is damaged by depending on a special sensor, cost is high, abrasion of a sealing ring is aggravated due to zero point fixation, and double-shaft synchronization precision and load distribution are disjointed are solved. According to the method, the position where the sealing ring reaches the sealing pre-tightening force serves as a dynamic non-fixed zero point, an additional zero point sensor or a collision sensor or a horizontal sensor is not needed, the current-torque coupling characteristic of a motor is utilized, and full-process automatic control is achieved through a high-precision Hall current sensor and an incremental encoder. The method comprises the following specific steps: initializing motor parameters, establishing a T = K * I mapping relation, calibrating a current overload threshold value, calibrating a current detection module, synchronously starting and operating double motor shafts, identifying a collision state based on current detection, locking and verifying a zero returning position, and judging zero point uniqueness based on torque uniformity. The double-shaft zero returning repetition precision is high, zero point uniqueness judgment fits the actual working condition, uneven abrasion of the sealing ring can be reduced, the service life of the sealing ring and the maintenance period of the valve are prolonged, meanwhile, the equipment manufacturing cost and the maintenance difficulty are reduced, and the vacuum sealing stability and the pressure control precision of the symmetric vacuum pressure control valve are effectively improved.

The invention provides a rigid-flex circuit board thermocompression bonding device and method. The rigid-flex circuit board thermocompression bonding device comprises a positioning assembly, and the positioning assembly comprises a thermocompression seat, a U-shaped thermocompression table, a mounting groove and a controller. The bidirectional synchronous motor drives the adjusting screw rod to rotate, so that the positioning plate is accurately controlled to move, rapid positioning of circuit boards of different sizes is achieved, and it is ensured that the positions of the circuit boards are accurate during hot pressing; the distance between the clamping blocks is adjusted by rotating the knob, the circuit board is firmly clamped, displacement during hot pressing is prevented, the hot pressing precision is improved, meanwhile, the structure can adapt to circuit boards of various sizes, the universality of the device is enhanced, and different production requirements are met; through the pressure sensor, the buffer block and the spring, pressure can be monitored in real time, pressure fluctuation can be buffered, uniform pressure application is ensured, meanwhile, the temperature sensor is matched with the heating pressing plate, temperature is monitored in real time and accurately regulated and controlled, temperature uniformity in the hot pressing process is ensured, bubbles, layering and other defects of a circuit board are effectively reduced, and the product performance and the yield are improved.

The invention discloses an electromagnetic noise suppression control method for a multi-phase self-excitation synchronous motor. A driving system of the synchronous motor comprises a double-closed-loop control system and an inverter. The specific method comprises the steps that the double-closed-loop control system outputs voltage reference signals of all coordinate axes, and all the coordinate axes are arranged in an electromechanical energy conversion plane and a non-electromechanical energy conversion plane respectively; injecting the square wave signal into a selected coordinate axis, and cooperatively adjusting excitation and noise values by using the positive correlation between excitation current and the amplitude of the square wave and the negative correlation between the excitation current and the frequency of the square wave; and then outputting the adjusted voltage reference signal, processing the adjusted voltage reference signal and other voltage reference signals, and outputting the processed voltage reference signal and other voltage reference signals to an inverter to generate a driving voltage. Therefore, the square wave amplitude is synchronously increased and the excitation current is kept stable when the noise reduction of the square wave frequency is improved by utilizing the quantitative relation that the excitation current is positively correlated with the square wave amplitude and negatively correlated with the square wave frequency, so that the load capacity of the synchronous motor is prevented from being reduced.

The invention belongs to the field of synchronous motor rotor position signal acquisition and processing, and particularly relates to a resolver angle compensation method which can improve the motor rotor position signal detection precision. The method comprises the following steps: step 1, acquiring rotary power transformation angle values of n periods; 2, determining an error array of n periods according to the electrical angle value of each period; step 3, performing interpolation calculation on the error array of n periods to obtain a 2-degree error distribution array; and 4, compensating the real-time sampling rotary power transformation angle according to the 2-degree error distribution array.

A torque ripple reduction method for a synchronous electric motor of a vehicle includes obtaining, by a control system, look-up tables (LUTs) that each include harmonic currents that satisfy a constrained objective function for phase current magnitude for the synchronous electric motor, based on a requested motor torque, determining, by the control system and using the LUTs, a plurality of currents including fundamental direct and quadrature currents and 6th order and 12th order harmonic quadrature currents, determining, by the control system, direct and quadrature voltages for the synchronous electric motor based on the plurality of currents including injection of the 6th and 12th order harmonic quadrature currents, and controlling, by the control system, the synchronous electric motor based on the determined direct and quadrature voltages to at least one of reduce torque ripples and increase efficiency of the synchronous electric motor.

The invention discloses a motor adaptive harmonic suppression system and method fused with LSTM prediction, and belongs to the technical field of power electronic control. Comprising a harmonic feature extraction module, a trapezoidal angle prediction module, an integral adjustment module and a trapezoidal voltage compensation module. The harmonic feature extraction module converts the three-phase current into dq-axis current; the trapezoidal angle prediction module establishes a model for predicting an optimal initial trapezoidal angle based on a long short-term memory neural network according to the d-axis harmonic current, the motor rotating speed and the bus voltage; the integral adjusting module adjusts a trapezoidal angle on line by inputting a harmonic error; and the trapezoidal voltage compensation module is used for modulating trapezoidal compensation voltage and outputting compensation voltage required by an alpha axis and compensation voltage required by a beta axis. According to the invention, prediction of the long-short-term memory neural network and online adjustment of the trapezoidal angle and modulation of the trapezoidal compensation voltage of the integrator are fused, the harmonic current of the permanent synchronous motor control system can be effectively inhibited, the torque ripple of the motor is reduced, and the performance of the motor is improved.

The present invention discloses a method, device, equipment, and medium for suppressing motor back-electromotive force harmonics. The method includes: obtaining the three-way back-electromotive force of a synchronous motor; transforming the three-way back-electromotive force to obtain a direct-axis back-electromotive force and a quadrature-axis back-electromotive force; performing a Fourier transform on the quadrature-axis back-electromotive force and extracting the amplitude, frequency, and initial phase of each order harmonic of the quadrature-axis back-electromotive force; reconstructing each order harmonic of the quadrature-axis current based on the amplitude, frequency, and initial phase of each order harmonic of the quadrature-axis back-electromotive force; superimposing each order harmonic of the quadrature-axis current to obtain a reconstructed quadrature-axis current; and injecting the reconstructed quadrature-axis current into the quadrature-axis back-electromotive force to obtain the original torque representation value. This solution achieves suppression of motor back-electromotive force harmonics, with excellent harmonic suppression effect.

The invention relates to the technical field of network construction type flexible direct-current power transmission system control, in particular to an oscillation suppression control method for a network construction type flexible direct-current power transmission system. The method comprises the following steps of: firstly, establishing a PI controller of a rectifier-side converter through reference voltage of the rectifier-side converter; then, based on virtual synchronous motor control, constructing a mathematical model of a network-forming controller, extracting an angular frequency error and an angular frequency change rate, and designing a power deviation and an adaptive adjustment rule to realize dynamic optimization of control parameters; and on the basis, generating a reference voltage of the alternating-current side network-building type inverter through the final network-building type controller, and further establishing a PI controller of the alternating-current side network-building type inverter. And finally, in combination with a rectification side PI controller, a network-building type controller and an inversion side PI controller, the stable control and oscillation suppression of the network-building type flexible direct current power transmission system are comprehensively realized.

The invention discloses a synchronous motor modular excitation active vibration suppression method for eccentric vibration, and the method comprises the steps: dividing a rotor excitation winding into 2P independent current control excitation modules in the circumferential direction, and respectively arranging an X-direction displacement probe and a Y-direction displacement probe, obtaining a first displacement signal and a second displacement signal of the rotor mass center relative to the stator and a rotor mechanical angular speed; performing band-pass filtering on the first displacement signal and the second displacement signal, and extracting a first displacement first-order component and a second displacement first-order component; calculating the shortest air gap direction angle and the eccentricity amplitude under the stator coordinate system, calculating the eccentricity, and calculating a first-order eccentricity coefficient; calculating a shortest air gap direction angle under a rotor coordinate system, and calculating an equivalent correction coefficient; and according to the equivalent correction coefficient, the first-order eccentricity coefficient, and the shortest air gap direction angle and the mechanical position angle under the rotor coordinate system, the injection amount of each excitation module is calculated, an excitation current instruction is generated and output to the corresponding excitation module, and active suppression of the unbalanced magnetic pulling force is realized.

The invention discloses a hybrid excitation synchronous motor control method and system, and belongs to the technical field of motor control. The problem that a motor control system can operate at high precision when a position sensor breaks down is mainly solved. The method comprises the following steps that when a position sensor breaks down, a system is switched to an active short circuit protection (ASC) mode, and operation of a motor is controlled by giving instruction values of d-axis current and q-axis current in the mode; then, in an ASC mode, estimating a rotor angle through a voltage equation in a static coordinate system, so as to obtain an electrical angle of a rotor; after the rotor angle estimation is completed, the system is switched from the ASC mode to the vector control mode without the position sensor, and the d-axis voltage and the q-axis voltage are adjusted in the mode, so that the motor can be continuously and accurately controlled and stably run. The invention provides an efficient and safe motor control method, and the safety and reliability of the electric vehicle under the condition of sensor fault are effectively improved.

The invention relates to a flexible DC converter based on a virtual synchronous motor, and a control method and system, and belongs to the technical field of electrical engineering. When an AC system fails, an active amplitude limiting coefficient, a reactive amplitude limiting coefficient and a current amplitude limiting coefficient are obtained through an AC voltage amplitude; multiplying the positive and negative active amplitude limiting coefficients by the rated power of the converter to obtain upper and lower limits of an active power reference value of an active virtual rotating speed control ring controlled by the virtual synchronous motor; multiplying the positive and negative reactive power amplitude limiting coefficients by a reactive power output upper limit of the system to obtain an upper limit and a lower limit of a reactive power reference value of a reactive power droop control ring controlled by the virtual synchronous motor; and multiplying the current amplitude limiting coefficient by the maximum allowable current set value during normal operation to obtain the upper limit of the current reference value of the current inner loop controlled by the virtual synchronous motor. The converter can also operate in a network construction type control mode during a fault period, and the maximum operation capability of equipment is exerted to support transient and steady stable operation of an alternating current power grid.

The invention belongs to the field of dehumidification, and particularly discloses a rotary dehumidifier applied to an outdoor electrical cabinet, which comprises a shell, a dehumidification mechanism, a regeneration mechanism and a controller, the dehumidification mechanism comprises a middle frame arranged in the shell, a containing groove is formed in the middle frame, a dehumidification rotating wheel is movably arranged in the containing groove, and an exhaust fan is arranged between a cover plate at the front end of the dehumidification rotating wheel and the middle frame. The regeneration mechanism comprises a synchronous motor arranged at the input end of the dehumidification rotating wheel, a shell is installed on the portion, on one side of the periphery of the dehumidification rotating wheel, of the middle frame, a heater is arranged in the portion, at the front end of the dehumidification rotating wheel, of the shell, a fan is fixedly installed at an air inlet of the shell through an air duct, and an air outlet pipe is fixedly installed at the rear end of the shell. The rotating wheel dehumidification principle is utilized, moisture in the cabinet body is discharged out, the influence of the environment temperature is small, and the rotating wheel dehumidification cabinet is suitable for being used in outdoor electrical cabinets.

The propulsion hydraulic system for the vertical shaft heading machine comprises a propulsion oil cylinder set, a hydraulic control system, a hydraulic control system and a hydraulic control system, and the propulsion oil cylinder set comprises a plurality of propulsion oil cylinders; the synchronous motor is formed by rigidly and coaxially connecting a plurality of hydraulic motors, and a rod cavity of each thrust cylinder is connected with an oil inlet of each hydraulic motor; the first control valve is connected with the pressure oil pipeline, the first oil return pipeline, rodless cavities of the propelling oil cylinders and oil outlets of the hydraulic motors; the second control valve is connected with the pressure oil pipeline and the rodless cavity of each thrust cylinder; and the flow capacity of the first control valve is greater than that of the second control valve. Functional requirements of high-pressure low-speed propelling and low-pressure fast synchronous stretching of the cutter head can be met, and the system is simple, easy to debug and low in cost.

The invention relates to the technical field of distributed energy grid-connected control, in particular to an intelligent monitoring ball enhanced distributed power supply coordination pre-synchronization control method and system, and the method comprises the steps: deploying a master intelligent monitoring ball at a grid-connected point, deploying slave intelligent monitoring balls at the output ends of all distributed power supplies, and forming a star-shaped sensing network; based on a multi-objective optimization algorithm, calculating a pre-synchronization target parameter and an adjustment weight of each distributed power supply, and generating a coordination control instruction; the virtual synchronous motor module receives the coordination control instruction, dynamically adjusts a virtual inertia and a damping coefficient, and adjusts output voltage, frequency and phase through a pre-synchronization execution unit; and after the synchronization reaches the standard, sequentially closing the grid-connected switches according to a preset power supply response priority sequence to complete the grid-connected action. According to the invention, a technical architecture of global monitoring-coordinated decision-precise execution-closed loop optimization is constructed, so that the stability and precise control problem during high-permeability distributed energy grid connection is solved.

The invention belongs to the technical field of direct-current synchronous motor control, and particularly relates to a PMSM improved sliding mode control system and method based on a two-section type dynamic boundary layer, in the aspect of rotating speed control, a rotating speed ring terminal sliding mode controller is introduced, related items of load torque and mechanical angular speed are combined into total disturbance, a nonlinear terminal sliding mode surface is selected, and the total disturbance is calculated. The problem that nonlinear disturbance cannot be effectively processed through traditional PI rotating speed control can be solved, finite time convergence of PMSM speed tracking errors is achieved, and meanwhile system buffeting is effectively reduced. In the aspect of current control, an improved sliding-mode observer is obtained according to a two-section quasi sliding-mode surface and an exponential reaching law design based on a terminal saturation function, so that the observation steady-state error of dq-axis back electromotive force is effectively eliminated, high-frequency buffeting in a sliding-mode reaching stage is effectively reduced, and the steady-state and dynamic performance of a system under electrical parameter mismatch is improved.

The present invention provides a method and apparatus for controlling energy storage-type emergency power supply and driving of an electrically excited synchronous motor elevator. The method comprises: determining whether to enter an emergency power supply mode; entering the emergency power supply mode, and switching an elevator from mains power supply to emergency power supply; converting direct-current power stored in a battery into three-phase alternating-current control power; starting an elevator assistance unit and an electrical control unit, and determining whether the elevator satisfies an operation condition; receiving an elevator operation instruction, starting an excitation direct-current conversion link, and controlling operation of the elevator according to the operation instruction; and exiting the emergency working mode, switching the elevator from emergency power supply to mains power supply, and switching from a circuit of the excitation conversion link to an original circuit. The present invention replaces an original diesel engine power generation system with a combination of new energy storage and current conversion, solves the problems of energy storage-type emergency power supply and emergency driving of an electrically excited synchronous motor elevator, and allows for quick establishment of an emergency rescue lifting channel, thereby providing safety guarantee for mine personnel and production.

The invention relates to the field of construction tools, in particular to light foam concrete pouring and conveying equipment which structurally comprises a base, a horizontally-arranged discharging device is arranged at the top of the base, an upper cover plate is installed on the upper surface of the discharging device, a feeding pipe is arranged on one side of the upper cover plate, and the discharging device comprises a guide pipe and a buffer. The buffer is connected with a feeding hopper, the feeding hopper and a bottom pipe at the bottom form a groove body, a rotary feeding rod is arranged in the buffer and the bottom pipe, the feeding rod is connected with a driving motor main shaft installed outside the feeding hopper, the synchronous motor drives the middle pipe to rotate, and the synchronous motor is electrically connected with a driving motor main board. The long-distance conveying capacity of foam concrete is achieved, defoaming in the start-stop process is greatly reduced, the effective pushing torque of the feeding rod is concentrated in the axial conveying direction by means of the segmented design of the pre-conveying section and the conveying section of the feeding rod and the radial limiting effect of the buffer, radial overflow of materials is restrained, and damage to foam caused by radial shearing is reduced.

The invention discloses an asymmetric six-phase hybrid excitation synchronous motor, a control algorithm and a two-gear transmission thereof, a stator winding of the motor is composed of two sets of three-phase symmetric windings in star connection, the first set of windings and the second set of windings are respectively connected to two three-phase PWM (Pulse Width Modulation) controllers, namely a main controller and an auxiliary controller, and the main controller and the auxiliary controller are respectively connected with the three-phase PWM controllers. And the two controllers are jointly powered by a vehicle-mounted battery. According to the asymmetric six-phase hybrid excitation synchronous motor, the control algorithm and the two-gear transmission thereof, under the condition that the battery voltage is limited, the output power of the motor can be further improved, in addition, the motor rotor is powered by the excitation winding, the excitation winding of the rotor is directly regulated and controlled in real time, and the efficiency of the motor is improved. And the high speed, miniaturization and high efficiency of the vehicle-mounted synchronous motor are greatly improved.

The invention discloses a Halbach array type permanent magnet motor rotor structure for a new energy vehicle, and relates to the technical field of new energy vehicle synchronous motors. And a second layer of No.1 permanent magnet, a second layer of No.2 permanent magnet, a second layer of No.3 permanent magnet, a second layer of No.4 permanent magnet, a second layer of No.5 permanent magnet, a second layer of No.6 permanent magnet and a second layer of No.7 permanent magnet are fixedly mounted on the inner side wall of the rotor silicon steel sheet. The number of effective magnetic poles of the rotor can be increased through the double-layer structure, magnetic leakage of a magnetic field in air gaps can be reduced, the efficiency of the motor is improved, the magnetizing angles of the permanent magnets are different, the magnetic field is more concentrated in a needed area through the design of the magnetic poles with different widths, and the uniformity of the magnetic field is further improved. And the magnetic field fluctuation during the operation of the motor is effectively reduced.