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This paper deals with electrical parameters identification of multi-winding induction motors. In particular, the study has been focused on electromechanical systems consisting of multiple three-phase stator winding sets sharing a common rotor. The stator units composing the system coupled to the power converters, measure systems and control units represent an integrated multi-drive system whose dynamic...
This paper shows that axial flux motors are compact, torque dense, efficient replacements for radial flux fractional horsepower motors. A commercially available radial flux fractional horsepower motor is used as baseline for design of its axial flux counterpart. The torque density and losses of the radial and axial flux motors, with identical permanent magnet utilization factors, are compared with...
This paper deals with the performance evaluation of a high speed axial flux switched reluctance motor for automotive traction applications. The motor makes use of a novel axial flux segmented rotor topology. The main aim of the design is to push the continuous power density as high as possible. The high speed nature of the design and the resulting high electrical frequency, as well as the machine...
There have been a number of recent advancements in magnetic gears and pseudo direct drive permanent magnet (PM) machines with integrated magnetic gears. Despite these advances, there are a number of applications where induction machine drives are preferable. This paper investigates the feasibility of a pseudo direct drive induction machine with an integrated magnetic gear, and presents some of the...
The design and experimental validation of a high-speed permanent magnet motor is presented in this paper. It is well known the dependency of the motor parameters on the temperature, frequency and saturation of the magnetic circuit. A new test procedure is implemented to calculate the values of the motor parameters at the operating speed and temperature. The total losses are obtained from the heat...
This paper examines the possibility of protecting the magnets of permanent magnet electrical machines against demagnetization in case of a sudden three-phase short circuit at the terminals of the stator winding. An analytical description of the effects that reduce the load that can demagnetize the permanent magnets is provided and verified using FEM simulation.
An induction machine with skewed rotor bars has enhanced starting performance and reduced current harmonic distortion. In a conventional skewed induction machine (IM) modeling, the axial magnetic flux variation is usually ignored in machine performance analysis in spite of significant parameter variation in the axial direction. Furthermore, the selection of optimal skew angle is vital to keep the...
This paper presents the design and control structure of a synchronous generator in ring form. The analysed generator is designed in order to test the control structure of a light-weight 10 MW generator for wind turbines. A segmented stator structure with distributed control allows control of the current of single stator segments which facilitates damping of axial displacement due to varying wind speeds...
An investigation into the solution dependence of a conjugate heat transfer computational fluid dynamics (CFD) model of a synchronous generator, with respect to meshing, has been carried out. Utilising CFD as a tool for investigating the airflow and thermal performance of electrical machines is increasing. Meshing is a vital part of the CFD process, but its importance is often misunderstood or overlooked...
This paper investigates a design method of a permanent magnet machine by using the new sintered magnet. The advantage of the new magnet is to realize arbitrary orientation direction. Furthermore, the magnet has higher degrees of freedom in its shape than the conventional Neodymium-Iron-Boron sintered magnet. Therefore, permanent magnet synchronous motor (PMSM) with the magnet can obtain high durability...
Synchronous reluctance motors with rotor flux barriers are a promising type of electric machines thanks to various benefits, among the others, the absence of permanent magnets and rotor excitation. However, these kind of machines has high torque ripple. This is due to the high harmonic content in the magnetomotive force which interacts with the rotor anisotropy. To the aim of minimizing this ripple,...
An increasing interest in both efficient electrical machines and more extensive control strategies demands evermore faster simulation tools. One of the modeling techniques that meets this demand is Fourier-based modeling. However, even Fourier-based models may encounter problems related to CPU usage. To cope with these problems the authors present three simple techniques to reduce the computational...
This paper proposes a method for enhancing torque capability of a dual 3-phase permanent magnet synchronous machine (PMSM) drive system by injecting the fifth and seventh current harmonics without any hardware reconfiguration. In this approach, compared with the third current harmonic injection which is commonly used to enhance torque capability, the two isolated neutral points of the dual 3-phase...
A Synchronous Reluctance Motor (SynRM), which has sinusoidal rotor lamination shape in the axial direction, is proposed. The sinusoidal lamination shape is utilized to vary the magnetic flux in the qr-axis direction. Therefore, cancelling some torque harmonics produced by slotting effects. The stator geometry of a 1.5 kW, conventional three-phase squirrel cage induction motor, with distributed double...
The spatial harmonic of magnet flux is a major cause of torque ripple in permanent magnet synchronous machines (PMSMs), and it is temperature-dependent. Thus, this paper investigates torque ripple modeling and minimization for PMSMs considering magnet temperature variations. Firstly, experimental studies are conducted to demonstrate that the torque ripple is magnet temperature dependent. Then, based...
The electrical windings are the necessary centerpiece for creating the rotating magnetic field. The winding is then a determining factor for the quality of dynamic performances of any electrical machine. This paper deals with the condition of transformation by re-winding a static armature of a small power three-phase squirrel cage induction machine to a five-phase machine. Only double-layer windings...
In this paper, the global operating point dependent losses of induction machines are studied utilizing a local transient loss formulation. After calculating the local loss distribution, the losses are integrated in space and averaged in time to get the average global losses. The main loss components Ohmic losses, iron losses and friction losses are considered. The Ohmic losses in stator and rotor...
The goal of this paper is to propose and validate standstill DC-Decay measuring methods for a rotor in arbitrary position. The first new method (DC-Decay I) delivers the equivalent circuit with a few measurements. The second new method (DC-Decay III) permits to catch the full equivalent circuit of both axes in only one measurement which is unique and a breakthrough in parameter identification. A new...
This paper reviews state-of-the-art in variable-speed operation of hydropower plants, the focus being on pumped-storage hydro. Relevant literatures are reviewed to address the benefits of variable-speed operation to both power system and hydropower plants. Two main configurations (i.e. DFIM and CFSM) to enable variable-speed operation are discussed and compared. Addressing the technology status and...
Voltage and torque ripples can reduce control precision and increase vibration and noise in electric vehicles, servo systems, or wind generators. To address this problem, we proposed a novel winding method in which three phase coils are wound around each tooth, with each coil having a different number of turns around a given tooth. The proposed winding scheme may also be applied to toroidal winding...
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