Electric Machines & Control Application (CN 31-1959/TM, ISSN 1673-6540), founded in 1959 and sponsored by Shanghai Electrical Apparatus Research Institute (Group) Co., Ltd., aims to publish cutting-edge achievements in various research fields related to the electrical science. The journal is a source journal of the Comprehensive Evaluation Database of Chinese Academic Journals, and the full text articles are included in Chinese Academic Journals (CD). It has been included in Chinese Core Journals and Key Magazine of China Technology for years. Recently, it has also been included in Japan Science and Technology Agency database (JST, Japan) and Abstract Journals (AJ, Russia). The impact factor is steadily increasing year by year. Electric Machines and Control Application is published on the 10th of each month and is publicly distributed domestically and internationally. The post issuing code is 4-199. More
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    2024,51(6):1-11, DOI: 10.12177/emca.2024.038
    Abstract:
    Six-phase permanent magnet synchronous motors have the ability of phase-deficient operation, thus precise prediction of their high resistance connection state must be made to ensure effective disconnection for faulty lines, prevent protection misoperation caused by system disturbances, and provide reliable criteria for fault-tolerant control. A mathematical model for complete decoupling of six-phase permanent magnet synchronous motor is established based on vector space decomposition, and its control system model is established. Motor signals in normal state and high resistance connection state are collected, and their energy distance features are extracted by wavelet packet decomposition, input to the back propagation neural network for offline training, and finally applied to sense development situation of high resistance connection state online under drastic conditions. Simulations are carried out based on Matlab, and the results show that the proposed strategy can effectively identify high resistance connection state, sensitively sense its development situation, send warning signals before the high resistance faults occur, and have certain robustness to drastic conditions.
    2024,51(6):12-19, DOI: 10.12177/emca.2024.049
    Abstract:
    Induction coilgun usually generates pulsating electromagnetic force which causes the large acceleration force fluctuation of the armature during the launch process. The excessive peak of acceleration force and the inordinate acceleration force fluctuation may be harmful to the load, especially for those carrying sensitive electronic components, which limits the value of induction coil emitters in practical engineering applications. Addressing the above questions, a new type of driving circuit for multi-capacitance time-sharing triggering is proposed, and the feasibility of the circuit is illustrated by analyzing the influence of the change of capacitance value and armature triggering position on the emission efficiency of the launcher. Three modes of driving circuits are designed for comparison, and the calculation results show that: under the conditions of the same initial energy storage and the approximate muzzle velocity of the armature, compared with other circuit triggering modes, in the time-sharing triggering mode proposed, the peak of electromagnetic acceleration force of the armature is reduced by 2.04 kN, and the acceleration force fluctuation is reduced by 2.36 kN. Therefore, the driving circuit with time-sharing triggering capacitor could effectively reduce the peak acceleration force and acceleration force fluctuation, and provides reference value for the design of the induction coilgun with sensitive loads.
    2024,51(6):20-30, DOI: 10.12177/emca.2024.042
    Abstract:
    Aiming at the problem that the hysteresis of error transfer becomes more serious with the increase of the number of motors in the traditional ring coupling control strategy, a consensus control strategy of multi-motor system based on event-triggered is proposed. The speed compensation of each motor in the multi-motor system is obtained by consensus algorithm to ensure the consistency of each motor speed and improve the tracking performance of the system. When the system reaches the steady state, the event-triggered mechanism is used to reduce unnecessary communication times and save communication resources. In addition, the ring coupling structure can ensure the synchronization performance of the system within the event-triggered threshold, and the event-triggered threshold decreases with time. Simulation results show that compared with traditional ring coupling control strategy, the proposed strategy of motor system has better synchronization performance and tracking performance, and along with the increase of the number of motor, the error transfer delay problem is improved. At the same time, the event-triggered control effectively reduce steady-state process unnecessary communication.
    2024,51(6):31-43, DOI: 10.12177/emca.2024.046
    Abstract:
    The fractional slot permanent magnet motor winding adopts a star-delta (Y-Δ) connection multi-layer winding structure, which can restrain the low order harmonic of armature magnetic field and improve the operation efficiency. However, this structure is more complex than the conventional Y connection double-layer winding structure, and the risk of inter-turn short circuit is higher. Firstly, a circuit model of inter-turn short circuit in Y-Δ connection fractional-slot permanent magnet motor (FS-PMM) is established. The fault three-phase current is derived, and fault current will be affected by the position of the inter-turn short circuit. Secondly, the whale optimization algorithm is improved by adaptive weights and Cauchy Gaussian mutation strategy. The improved whale optimization algorithm is adopted for optimizing the parameters of variational mode decomposition, and a parameter optimized variational mode decomposition algorithm for processing current signal is proposed. Finally, by calculating the multi-scale fuzzy entropy of current and torque, a fault diagnosis method for Y-Δ connection FS-PMM inter-turn short circuit is proposed. The accuracy of this fault diagnosis method can reach over 95%, and it can effectively distinguish the inter-turn short circuit fault between the Y connection part and the Δ connection part.
    2024,51(6):44-56, DOI: 10.12177/emca.2024.039
    Abstract:
    The rectifier is an important component of the doubly salient electromagnetic generator (DSEG), which frequently bears high voltage and large current and is prone to failure. However, due to the asymmetry and non-sinusoidal nature of the DSEG phase currents, the traditional open-circuit fault diagnosis algorithms are highly susceptible to misdetection in the transient of the variable operating conditions. To diagnose the open-circuit fault in the DSEG rectifier unit, based on phase current size positional relation, a strong robustness diagnosis strategy is proposed. By theory derivation and experimental verification, it can be concluded that the proposed strong robustness open-circuit fault diagnosis strategy does not misdiagnose in the transient states of variable load, variable excitation and variable speed. And it can detect all types of single-tube and dual-tube open-circuit faults within one fundamental wave period, and has small computation and space occupation.
    2024,51(6):57-68, DOI: 10.12177/emca.2024.045
    Abstract:
    Based on the discharge inductance model, the transient characteristics of capacitive rectifier system of pulsed homopolar inductor alternator are analyzed, and all four operating modes of this rectifier system are clarified. The critical voltage between modes and the formulas for calculating commutation delay angle and overlap angle are derived, and a transient model is established. The accuracy of the proposed theoretical calculation is verified by valve-to-valve circuit simulation and experimental results. The function of each mode in the circuit to the charging process is expounded, and the equivalent form of circuit is analyzed, and reveals the design principle of the charge voltage and the amplitude of motor electromotive force (EMF). The results of the study show that: the circuit can be seen as a form of charging a capacitor by serially connecting a DC source with an equivalent commutation reactance and an equivalent transient commutation inductance; mode 1 and mode 2 play a major role in the whole charging process; the reasonable charge voltage should be between 1.3 times and 1.5 times of the amplitude of generator′s phase EMF.
    2024,51(6):69-77, DOI: 10.12177/emca.2024.043
    Abstract:
    Permanent magnet synchronous motors used in electric vehicles are needed to consider not only the performance under rated operating conditions, but also the overall efficiency across the entire road spectrum. Based on this, an optimal design method for asymmetric V-shaped interior permanent magnet synchronous motor based on new European driving cycle (NEDC) driving cycle is introduced. The geometric parameters of the upper and lower parts of the permanent magnet in the above asymmetric motor are parametrically modeled as independent parameters. Taking the NEDC efficiency and torque-cost ratio as the optimization objectives, the genetic algorithm is used to optimize the symmetric and asymmetric V-shaped permanent magnet synchronous motors, respectively. Finally, the optimal design point on the Pareto front is selected for comparison of electromagnetic performance. The simulation results show that compared with the symmetrical structure, the asymmetrical rotor structure exhibits stronger torque performance due to the magnetic field offset effect. Therefore, the asymmetric V-shaped permanent magnet synchronous motor exhibits better electromagnetic performance and lower manufacturing cost, and has a broad application prospect in the field of electric vehicles.
    2024,51(6):78-87, DOI: 10.12177/emca.2024.051
    Abstract:
    The inter-turn short-circuit (ITSC) fault of stator winding is one of the most common faults of permanent magnet synchronous motor (PMSM). A large current will be generated in the shorted portion of the winding when the fault occurs, which will pose a great threat to the safe operation of PMSM. In order to diagnose the ITSC fault, the effect of ITSC fault on the stator current of PMSM is analyzed. The stator currents of PMSM with different ITSC faults are obtained by finite element simulation and experimental measurements. And the effect of ITSC fault on stator current of PMSM is analyzed by current imbalance, negative-sequence current, and wavelet energy spectrum. The analysis results show that with the increase of short-circuited turns and the decrease of contact resistance, the current imbalance, negative-sequence current, and the energy gradient of D1 in wavelet energy spectrum increase. Thus, the increase of these three indicators can be used as the basis for diagnosing the ITSC fault.
    2024,51(6):88-97, DOI: 10.12177/emca.2024.047
    Abstract:
    In order to solve the pole frequency vibration problem of a 10-pole and 12-slot surface-mount permanent magnet synchronous motor, a weakening scheme of the pole structure with axially unequal width is proposed. This scheme can effectively reduce the extreme frequency vibration of the motor under the premise of ensuring the torque density of the motor. Firstly, based on the Maxwell stress tensor method, an analytical expression for the radial electromagnetic force of the motor is derived, and a model of the electromagnetic force acting on the stator teeth of the motor is established. Simultaneously, factors contributing to the generation of pole frequency electromagnetic force harmonics in the prototype are analyzed. Then, through finite element simulation analysis, the basic mechanism of reducing pole frequency electromagnetic force by using the magnetic pole structure with axially unequal width is explained. And comparison analysis of the motor′s electromagnetic performance and vibration acceleration before and after optimization is conducted. Finally, the results show that the polar structure with axially unequal width can effectively reduce the harmonics and vibrations of the polar electromagnetic force while maintaining the torque density of the motor, which confirms the effectiveness of the optimization scheme.
    2024,51(6):98-106, DOI: 10.12177/emca.2024.041
    Abstract:
    A fault-tolerant control scheme based on command filtered backstepping method is proposed for the failure of a single motor in a four-motor servo system. Firstly, a dynamic model of the fault servo system with unknown inertia and unbalanced torque is established. Subsequently, the controller is designed using command filtered backstepping technology, in which an error compensation system is designed to improve the control accuracy. In addition, the neural network is used to deal with the nonlinear disturbance caused by the faulty motor, and synchronization error signals are designed to achieve synchronization control of the system. Finally, based on the Lyapunov stability theory, the stability of the closed-loop system under the condition of single motor failure is proved. And simulation is designed to verify the effectiveness and superiority of the proposed control method.
    2024,51(6):107-116, DOI: 10.12177/emca.2024.050
    Abstract:
    When the permanent magnet synchronous motor is under high frequency conditions, the core loss of the stator and rotor and the eddy current loss of the permanent magnet will increase, which will increase the temperature of the motor, resulting in insulation aging and permanent magnet demagnetization. In order to solve the problem of increasing loss at high frequency, a double claw pole motor with axially segmented claw pole stator and single-stage claw pole rotor with soft magnetic composite materials for stator and rotor core materials is designed. Similar to the problem of excessive torque ripple in the double-salient structure, a combination of rotor magnetic pole offset and stator oblique pole to reduce torque ripple is used. Finally, the electromagnetic design and temperature distribution of the motor are analyzed to verify the rationality of the design. For the selection of claw pole parameters, the effects of the main size ratio, polar arc coefficient, rotor magnetic pole offset distance and stator oblique pole angle on the air gap magnetic density, no-load back electromotive force, torque and torque ripple of the double claw pole motor are studied.
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    2019,46(9):85-94, 110, DOI:
    [Abstract] (440) [HTML] (0) [PDF 923.86 K] (14340)
    Abstract:
    The impact of largescale access of wind farms on the transient stability of power grids could not be ignored. Taking the extended twomachine system with doublyfed wind turbines as an example, the equivalent model of doublyfed induction generator was established, and the twomachine system could be equivalent to a singlemachine infinity system. Based on the law of equal area, the analytic formula of critical clearing angle of the system was deduced in detail after wind power accessed. The analytic formula was used to quantitatively analyze the variation trends of the critical clearing angle with wind power ratio, wind turbine grid connection position, fault location and load access position. The influence laws of the above four factors on the stability of transient power angle were summarized. The simulation models of the extended twomachine system with doublyfed induction generator was established in BPA and FASTEST, and the accuracy of the theoretical analysis was verified.
    2017,44(6):8-12, DOI:
    Abstract:
    Multimotor synchronous and coordinate system was widely used in the field of motor control. The control strategy played a important role in the performance of multimotor synchronization system. Domestic and foreign scholars had conducted deep research, who aimed at the problem of multimotor synchronization.They put forward a variety of synchronization control strategies. The control strategies proposed at home and abroad were reviewed. The accuracy of tracking, robustness and capacity of antiload of the control object were analyzed. The new prospect of multimotor synchronization control was proposed.
    2020,47(3):17-22, DOI: 10.12177/emca.2019.172
    Abstract:
    In the permanent magnet synchronous motor (PMSM) drive system, the system current inner loop controller based on the finite control set model predictive current control (FCS-MPCC) algorithm is affected by the variation of motor parameters. The prediction model of PMSM is derived. The cost function is reconstructed with the voltage vector as the constraint, and the current ripple problem caused by the digital delay is compensated. A robust FCS-MPCC algorithm is proposed, which reduces the sensitivity of the algorithm to the parameters by introducing weight coefficients and quantitative adjustments in the prediction model. The simulation results show that the proposed algorithm is effective and can make the system have good dynamic performance and steady state accuracy.
    2017,44(6):1-7, 18, DOI:
    Abstract:
    Inwheel motor drive technology represents an essential development direction in new energy vehicle drive system. The technical requirements and drive form were introduced. The technical requirements and drive form of inwheel motor drive were summarized. Current research situation of inwheel motor drive technology was compared and analyzed briefly. The key technique problems of inwheel motor technology were proposed. The essential technologies in descreasing unsprung mass, restraining vertical vibration effect and reducing torque ripple of inwheel motor were discussed, which were supposed to be solved urgently. The development trend of inwheel motor drive technology was predicted.
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