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Pulsating mode of asynchronous motors operation is finding wide application in various electric drives. In this regard, the problem of creating mathematical models of a pulsating mode, taking into account the real factors, becomes urgent. These models will allow to optimize the process of designing of the pulsing actuators based on asynchronous motors. The article describes mathematical models of...
To solve the problems of rotor flux field orientation loss and operation performance degradation caused by neglecting iron loss in the conventional vector control system, a new vector control strategy based on iron loss model of induction motor (IM) is proposed in this paper. In this strategy, a slip-type indirect field oriented vector control (IFOC) is designed by setting the magnetizing currents...
This paper deals with the optimal state reference calculation for synchronous motors with a magnetically salient rotor. A look-up table computation method for the maximum torque-per-ampere (MTPA), maximum torque-per-volt (MTPV), and field-weakening operation is presented. The proposed method can be used during the drive start-up, after the magnetic model identification. It is computationally efficient...
Axial flux machines (AFMs) are used in applications that require high power and torque densities in a pancake-type form factor. There are various types of AFMs based on the configuration of the rotor/stator and permanent magnet (PM) orientation. Most AFMs employ surface permanent magnet machines and as the result, the machine has low inductance and saliency. In this paper, an axial flux machine with...
This paper proposes a method based on signal injection to obtain the saturated current-flux relations of a PMSM from locked-rotor experiments. With respect to the classical method based on time integration, it has the main advantage of being completely independent of the stator resistance; moreover, it is less sensitive to voltage biases due to the power inverter, as the injected signal may be fairly...
This paper explores some of the characteristics and limitations of the series configuration of hybrid excitation synchronous machine (HESM) compared to the wound field synchronous machine (WFSM). It also explores the influence of magnet excitation to field excitation ratio on their performances. The WFSM is a conventional salient pole synchronous motor, and the HESM consists of conventional salient...
This paper presents a research regarding a special design for a micro-wind turbine that drives a permanent magnet generator with two rotors that spin in opposite directions and recovering the energy by intermediate of brushes-rings system. The aim of this study is to develop and prove the functionality of a two rotors counter rotating permanent magnet generator by comparative results between the finite...
There are many publications that emphasize the advantages of C- and E-Core Flux-Switching-PM-Machines, which apply less magnet material than the conventional Flux-Switching-PM-Machine. However, most researches only focus on low-power applications beneath 1 kW. This paper investigates the performance of Flux-Switching-PM-Machines in a speed range between 1000 min−1 and 3000 min−1 at a 300 W and at...
This paper investigates the influence of geometric design variables on the machine's characteristics of low voltage permanent magnet synchronous motor for in-wheel direct-drive application. On the base of finite-element-analysis, sensitivity analysis has be performed to improve the torque density and the efficiency. The effect of different slot/pole combinations on the machine's characteristics has...
In this paper, a semi-analytical modeling method is applied to a Doubly Salient Permanent Magnets machine. This machine is characterized by a rotor carrying a large number of teeth. It is suitable to applications requiring high torque and low speed. A Reluctance Network is used in order to model the machine with a good compromise between accuracy and simulation duration. Moreover, the antisymmetric...
Interior permanent magnet synchronous motors (IPMSMs) are currently widely utilized as traction motors. The permanent magnets used in IPMSMs are an important factor; thus, high-coercivity permanent magnets with lesser rare-earth elements are in development. This paper proposes two modified versions of double-layered IPMSMs containing a strong magnet to improve their efficiency and reduce their size...
This paper proposes a torque ripple reduction method for Switched Reluctance Motor (SRM). Large torque ripple occurs in SRM during switching phase interval. In order to reduce the torque ripple, the ideal current waveform, which reduces completely the torque ripple, is applied as a command value controlling the instantaneous torque. In the proposed method, the ideal current waveform is derived by...
This paper proposes a sensorless self-commissioning technique for PM-assisted synchronous reluctance motors. The identification of the machine's flux maps is performed at standstill without any position transducer and with no need of rotor locking. The machine is first excited with alternated high voltage pulses, injected in the estimated d and q directions of the rotor to determine its saturation...
Hybrid permanent magnet (PM) variable flux memory (VFM) machines employ both the high coercive force PM, i.e. the constant PM (CPM), and the low coercive force PM, i.e. the variable PM (VPM), with which the PM magnetization state can be flexibly regulated to match various operation requirements. These two kinds of PMs can be magnetically connected with either parallel or series configuration so that...
Considering that the magnetic performance of the ferrite magnet is relatively weak, an interior ferrite Permanent magnet synchronous motors (PMSM) with reliable flux-focusing structure is presented in this paper. An optimal maximum torque per ampere (MTPA) control strategy is proposed, which fits the variation of core saturation and winding inductances. In order to simplify the computation complexity...
The effect of slots poles combination on inductance and torque was investigated on the motor with outer rotor bonded NdFeB Halbach cylinder designed for automotive application. Motor with Halbach rotor has better performance with higher number of slots and poles combination. The magnet eddy loss was calculated and analyzed with different slots poles. The impact of rotor back on the eddy current was...
In this paper, conventional Magnetic Gear (MG), which has Surface Mounted Permanent Magnet rotor Magnetic Gear (SPMMG), and Consequent pole Permanent Magnet rotor Magnetic Gear (CPMMG), which has high torque density, is analyzed. For analysis, various pole pieces shape considering flux density distribution and leakage flux in pole piece core are studied. Moreover proposed design variables are adopted...
In this paper, we propose a bias field free Spin Hall Nano Oscillator (SHNO) device with perpendicular-to-plane magnetic anisotropy for alternative computing. Coupled oscillator networks can be used to perform computations such as edge detection of an image, associative computing, etc. that are unsuitable (inefficient) in von-Neumann computing models. Recent experiments on SHNOs have demonstrated...
This paper presents the design and performance comparison of a conventional claw-pole machine with a permanent magnet based claw-pole machine for automotive application. The magnets are placed in the inter-claw region to decrease the leakage flux and to supply increased magnetic flux in the machine. It has been observed that with the addition of permanent magnets weighing only a few grams, there is...
Wide usage of drives based on induction motors has put forward the problem of asynchronous motor torque and velocity maximum utilization. The important move in this direction is a fine adjustment of the rotor magnetic flux observer. The observer adjustment technique is put forward. The criterion of optimality is constancy of acceleration providing magnitude constancy of stator current active and magnetizing...
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