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Permanent magnet synchronous machines (PMSMs) have been used in many applications due to their outstanding advantages such as high torque/power density, high efficiency, light weight and good reliability. However the emerging field of electrical traction gave arise to issues which were in general hardly considered in the past Yet, even though well established methods for eDrive control are available,...
The novel doubly salient slot permanent magnet linear machines (DSSPMLMs) are proposed in this paper. First, the topology and geometric parameters of the DSSPMLMs with 12 slots are introduced, and the corresponding basic operating principle is investigated. Then, feasible slot/pole combinations and winding configurations are further analyzed. To the DSSPMLMs with 12 slots, all structures with 10/11/13/14...
This paper proposes a novel flux-reversal hybrid magnet memory machine (FR-HMMM), which is geometrically characterized by consequent-pole hybrid magnets mounted on the stator poles. The low-coercive-force (LCF) permanent magnets (PMs) are alternately placed between the adjacent stator slots, while the rare-earth NdFeB PMs are located on the center of stator pole. Due to the consequent pole configuration,...
Vernier permanent magnet synchronous machine (VPMSM) is a promising candidate for low speed direct-drive applications. At the design stage of VPMSMs, one of the key issues is the selection of the slot/pole number combination. This paper will show that a proper selection of the slot/pole number combination can be achieved based on an index parameter of VPMSMs: the gear ratio. Firstly, the magnetic...
In this paper, the stator/rotor pole combinations in variable flux reluctance machines (VFRMs) are investigated from the prospect of magnetic gearing effect. Firstly, the magnetic gearing effect in the torque production of VFRMs is revealed from an analytical model. Based on this, the principles of feasible stator/rotor pole selection and corresponding winding configuration are analyzed. Then, the...
Referring to a 4-wheel drive Formula Student Electric vehicle, a fractional-slot synchronous permanent magnet machine has been designed. Torque density has been improved adopting outer rotor topology and lightweight materials. An ironless rotor with PMs placed in an Halbach array configuration allows reduced rotor inertia to be obtained. The results described in the paper provide a quantitative assessment...
Since the vernier machine (VM) is a flux modulation machine that also operates simultaneously as a synchronous machine, the torque producing mechanism of this device is difficult to understand. This paper begins with an analytical study of a synchronous permanent magnet (PM) machine, where the back-emf and torque are derived based on a generic number of slots per pole per phase stator. Numerical comparison...
This paper investigates the applicability of fractional-slot concentrated windings to Synchronous Reluctance Motors for industry applications. Tooth-wound winding arrangements are attractive for the industry due to their lower cost of manufacturing, but when associated to a synchronous reluctance rotor they tend to lower the output torque and power factor of the machine significantly, and to excite...
In this paper, the significant influence of rotor-poles number on the electromagnetic performances of the novel rotor-permanent magnet flux-switching (RPM-FS) machine is investigated. The operation principles of the RPM-FS machines with 10-, 11-, 13- and 14-rotor-poles are analyzed from the generator and motor-driving perspectives, respectively, and the armature reaction field and PM field modulation...
This paper deals with the design of the rotor of synchronous reluctance machines, characterized by a multi flux-barrier structure. In particular, the focus will be on the proper design of flux-barriers geometry. An analytical model is adopted to compute the impact of the rotor flux-barriers on the torque, focusing on the torque ripple. Thanks to proper assumptions, the analytical model is simplified...
This paper proposes an enhanced approach to estimate the stator winding temperature based on active DC flux injection for induction machines with two representative direct torque control (DTC) schemes, the conventional hysteresis-based DTC and the deadbeat DTC. In this method, the stator resistance is regarded as the indicator of its temperature, and is estimated by applying offsets to the flux controllers...
Ultra-high speed switched reluctance machines (SRM) are becoming more and more promising due to its robustness and simple geometry. This paper proposed a detailed design procedure for an ultra-high speed SRM, including dimension calculation, material selection, winding selection, windage torque calculation, drive system and control strategy. The ultimate goal is to build a machine that is electromagnetically...
This paper investigates a novel two-converters based operation of a Brushless Doubly Fed Reluctance Machine (BDFRM). The BDFRM has a ducted rotor, and the stator is wound with two distributed windings which are fed from two separate power converters. Operation theory with frequency sharing between the two windings is introduced and corresponding FEA simulations are analyzed. The proposed BDFRM design...
This contribution suggests an approach to determine the optimal design of a Permanent Magnet Synchronous Motor for a given application by calculating the effects of coil configuration switching, pole-changing and multi-phase windings. The impact on the torque-speed-characteristic of a motor is evaluated in a normalized parameter plane, enabling the designer to compare the influences by using criteria...
A new scheme for Direct Torque Control (DTC) of dual inverter fed Induction Motor (IM) with open end stator winding is presented in this paper. This scheme eliminates common mode voltage from the windings there by facilitating both inverters to draw power from a common DC source without circulation of common mode currents though the windings and switches. A major advantage of this DTC scheme is the...
Hybrid excited flux-switching machine (HEFS) is a novel brushless synchronous motor. Compared to conventional permanent magnet synchronous machine (PMSM) and permanent magnet flux switching (PMFS) machine, it has additional excitation winding in its stator to modulate the air-gap magnet field. In this paper, the topology and operating principle of HEFS is analyzed. Its dynamic mathematical models...
This papers deals with the control of active and reactive powers in wind energy conversion systems (WECS) powered by dual-stator-winding squirrel-cage induction generators (BDFIG). In these systems, the MPPT technics based on a torque control present coupling with reactive power objectives. A High Order Sliding Mode MIMO control is proposed for satisfying the power objectives in a decoupled way. The...
Permanent Magnet Synchronous Motor (PMSM) as the key component of the Electric Vehicles (EVs), has numerous advantages over other synchronous motors. Fault diagnosis is essential to guarantee the safety and continuity of the operation for EVs. An undetected fault in the PMS M system may lead to high repair cost, or even catastrophic failure. Among lots of faults in the PMSM, the most serious are short...
On the basis of establishing mathematical model of induction machine, the simplifying assumption of two-dimensional plane finite element model was proposed, and Dirichlet and main boundary conditions were defined. The speed governing of induction machine was realized using back-to-back voltage-fed frequency converter. The continuous output direct voltage value of three-phase non-controlled rectifier...
This paper studies the dynamic performance of BLDC motor with MatLab/Simulink, and the results of torques and speeds are verified with Mathematica software. MatLab/Simulink provides suitable environment for control application and power electronic design, whereas Mathematica is better for symbolic part and therefore it could be preferred for design and control applications for electrical motors. By...
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