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In DC-biased sinusoidal current vernier reluctance machines (DC-biased-VRMs), the DC exciting winding and AC armature winding are integrated into one single winding. Therefore, the copper loss can be reduced with torque density increasing, and only one set of power electronic converter is demanded. This paper is to propose a DC-biased-VRMs drive with asymmetrical power electronics devices and corresponding...
This paper proposes a control schema for permanent magnet machines, which is synthesized by field-oriented control, synchronous pulse width modulation and phase-lock loop based sampling synchronization. Switching frequency of inverters in electric locomotive applications is limited by considering switching losses. Lower switching frequency deteriorates performance of machines, e.g., extra machine...
Permanent magnet Vernier (PMV) machines have attracted more and more attention for their merits of high torque density and simple structure. And principle of electromechanical energy conversion is the most common way to investigate the PMV machine by calculating back EMF and electromagnetic torque. In this paper, a new perspective on the mechanism of PMV machines based on the Maxwell stress tensor...
This paper introduces the differential-mode circulating current (DMCC) and zero-sequence circulating current (ZSCC) reduction method for paralleled inverters with zero common-mode (CM) PWM algorithm. By analyzing the reason of current jump in phase-leg, the method based on the freedom of PWM signal exchange and active voltage vector sequence exchange can be adopted which can keep volt-seconds balance...
This paper introduces a paralleled three-phase four-leg inverters and the corresponding pulse width modulation (PWM) method for the purpose of reduction the common mode current (CMC) and common mode electromagnetic interference (EMI). Considering the control principle of three-phase four-leg to limit the common mode voltage and the characteristic of paralleled inverters, the simple PWM scheme for...
In order to optimize aircraft performance and decrease operating and maintenance costs, traditional aircraft is moving towards a more electric aircraft. Moreover, integrated starting/generating system is one of the key components in a more electric aircraft. To determine whether starting/generating system meets the intended requirements, it is necessary to test the system. Herein, this paper is going...
Flux reversal permanent magnet (FRPM) machine, with magnets mounted on or inserted into the stator, is favorable for the direct drive applications. In this paper, a novel FRPM machine with Ralbach array magnets in stator slot opening is proposed. While the magnets are moved to the slot opening, effective airgap length is reduced and slot area is enlarged. The analysis results indicates that the torque...
This paper presents thermal analysis of a water-cooled dual-stator axial-flux permanent magnet (AFPM) machine with focus on the sandwiched rotor. The rotor of the machine is featured by combined rectangle-shaped magnets. Firstly, the eddy current losses in the PM are calculated and analyzed. Secondly, lumped-parameter and FE thermal models are established to calculate the temperature distribution...
In this paper, a novel stator structure with axially tapered stator tooth tip is proposed to mitigate cogging torque and reduce the machine back EMF harmonics. Furthermore, the stator tooth tips are specifically designed to provide balanced axial electromagnetic force. In order to realize continuous variation of stator tooth tip widths, the soft magnetic composite (SMC) material is used for the stator...
Surface permanent magnet vernier (SPMV) motors are gaining more and more attentions over recent years due to their high torque density. Generally, most researches focuses on their applications in low speed, high torque area, and the study on their high speed operation is rarely seen. In this paper, a SPMV motor with 12 slot, 20 rotor pole is evaluated for traction application. The optimal designed...
This paper investigates the effect of AC losses on the steady-state temperature rise distribution in concentrated windings of permanent magnet machines with parallel strands by combined electromagnetic and thermal finite-element analyses. The copper losses are decomposed into DC loss, strand-level AC loss and bundle-level AC loss. It shows that the AC losses can significantly increase the winding...
In recent years, the magnetic field modulation motors (MFMM) are attracting more and more attentions due to their compact structure and contactless torque transmission function, etc. However, multi-design parameters and output ports make the optimization for the MFMM necessary and difficult. In this paper, an automatic multi-objective optimization of the MFMM based on the advanced differential evolution...
Permanent magnet vernier machines are receiving more and more attentions in low-speed high-torque applications due to their inherent features such as compact structure, high torque density, low torque ripple, etc. This paper presents and compares several linear topologies of permanent magnet vernier machines, all of which have double-sided secondary and toroidal-winding configuration. By using finite...
Multiphase machines are superior to three-phase machines with high reliability and large power capability. In the post-fault operation when one phase of an induction machine is open circuit, model predictive control has been proved to have rapid current, torque and speed response. However, the mathematical model in post-fault operations of multiphase permanent magnet (PM) machines is quite different...
This paper studies the magnetic stress and vibration characteristic of the permanent magnet assisted synchronous reluctance machine (PM-SynRM). Firstly, the frequency and spatial orders of radial stress are investigated by analytical equations. Then, two PM-SynRMs are designed, and their open-circuit and armature magnetic stresses are calculated by finite element method (FEM) and compared with the...
In this paper, an exact analytical method is developed to computer the air-gap magnetic field of surface-mounted permanent-magnet (SMPM) motors for valuating slotting effects accurately. In order to improve the flux density and reduce cogging torque, the genetic algorithm toolbox of Matlab is used to optimize the motor, in which the actual depth of slot, slot opening, the length of gap and pole-arc...
An interior permanent magnet (IPM) machine applied in rail transportation is designed and optimized in this paper. A quasi-octagonal stator iron yoke is adopted in the machine in order to meet the requirement of the installation while the parallel slot structure is also employed due to the arrangement of the performed windings. The method of equivalent stator slot is proposed in this paper to analyze...
This paper proposed a super-twisting algorithm based sliding mode observer (STA-SMO) for permanent magnet synchronous machine (PMSM) sensorless control, in which voltage-source inverter (VSI) nonlinearity is taken into consideration. A lookup table for online tunning sliding mode coefficients of STA-SMO is obtained based on existing stable conditions. Since mismatch between reference and actual voltage...
This paper mainly focuses on the analysis of the eddy current loss in permanent magnet (PM) of the surface-mounted PM vernier machine (SPMVM). The eddy current losses under open-circuit, armature reaction and load conditions are detailed investigated by the analytical method and finite-element analysis (FEA). The influence of the pole ratio, which is defined as the ratio of the rotor PM pole-pairs...
This paper investigated and compared two types of modified model predictive control methods with finite set for six-phase PMSM MTPA control. The first one has conventional cascaded speed and current controller loops where the PI current loop is replaced with a MPC control loop. The second method uses one MPC controller in place of conventional cascaded loops for both speed and current control. The...
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