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A novel 4/4 stator/rotor single-phase doubly salient permanent magnet machine (DSPMM) with asymmetric stator poles is proposed in this paper. The stator poles of proposed machine are distributed non-uniformly along the circumference of the stator yoke. Firstly, it investigates the new topology and operation principle based on diagram description and mathematical derivation. Then, the dimension equation,...
This paper presents a simple method to determine equivalent circuit parameters of double-cage Induction Motors (IM). A new formula to calculate the equivalent circuit parameters of double-cage IM is proposed. The formula is very simple so as to be able to calculate by a calculator but can determine the parameters of outer- and inner-cages bars accurately. In addition it is possible to take magnetic...
Integrated charging (IC) technology in electric vehicles (EVs) employing conventional power electronics and motor drivetrain components facilitates level 3 fast charging capabilities with reduction in overall weight and cost of the vehicle. However, when the winding inductances of 3-phase interior permanent magnet synchronous machines (IPMSMs) are realized as line inductors for battery charging, due...
This paper is focused on the analysis of the geometrical deviation of a variable reluctance (VR) resolver and its impact to the inverter losses for automotive applications. Therefore a VR resolver model is introduced, verified with measurements at a sensor test bench and the additional inverter losses are investigated.
Magnetoelectric turbo-generators with direct drive from a turbine which rotor speed reaches several hundreds thousands rpm are widely used in microturbine power plants. Due to the action of centrifugal forces, the permanent magnets of the rotors endure considerable mechanical stresses. In most cases, brittle rare-earth permanent magnets are used in microturbines. To ensure the mechanical stress of...
This paper investigates the cross-coupling effect of a 3 degrees of freedom magnetic bearing (3-DOF MB) using the magnetic circuit method comprehensively. The EMF of X-axis (or Y-axis) coil induced by the current variation Eix (Eiy) can vary in a range of up to 14.7% due to the cross-coupling caused by Z-axis current. Moreover, the X-axis (or Y-axis) force characteristics and stiffnesses are significantly...
A saturation map for the non-uniform magnetic saturation of a V-shaped interior permanent magnet rotor is formulated in this paper. This saturation map is used in conjunction with the magnetic equivalent circuit theory to propose an analytical method for accurate computation of the airgap permanent magnet flux density for interior permanent magnet rotors. Unlike the conventional methods, the proposed...
Modified Magnetic-Equivalent-Circuit for a Double-Cage-Induction Machine is presented in this paper while rotor skewing, time and also space harmonics are considered. Pole numbers, rotor bars and slot numbers can be selected arbitrarily and saturable machine is simulated. To presenting of Modified magnetic equivalent circuit, a single set of the system equations including both magnetic and electric...
This paper proposes a novel variable reluctance hybrid magnet memory machine (VR-HMMM), which is geometrically characterized by doubly salient structure having homopolar hybrid magnets alternatively mounted on the stator poles. The magnetizing coils are wound on the PM excitation teeth to vary the magnetization states of low coercive force (LCF) magnets, and hence the air-gap flux can be flexibly...
The frequency of time harmonics and space harmonics is higher in magnet field of high-speed permanent magnet synchronous machine (PMSM). The rotor loss cannot be neglected any more, especially eddy current loss in permanent magnet (PM). The high temperature of rotor during no-load in PMSM is a problem of flywheel energy storage system (FESS). The size parameters of air gap and rotor structure is important...
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...
This paper investigates a novel hybrid axial- and radial-magnetic circuit permanent magnet synchronous machine with flux weakening capability. The presented machine consists of a solid rotor and two stators, i.e. radial stator and axial stator. The PMs are radially buried in the solid rotor so that the flux flows into both radial and axial stator. This paper describes the principle of the presented...
The unbalanced magnetic force (UMF) occurs in permanent magnet (PM) machines when there is rotor eccentricity. This paper investigates the influence of slot/pole combination and magnet thickness on UMF in PM machines having different rotor eccentricities and magnetizations. It shows the machines with different magnetizations have different UMFs due to rotor eccentricity when magnet thickness and slot/pole...
This paper focus on the issue of internal electromagnetic coupling in the EVT with flux-insulation ring or not. Firstly, it can be known that the EVT makes the internal combustion engine (ICE) decouple from the drive shift and operate with improved fuel economies and emissions by analyzing power splitting procedure. However, the advantages also makes the electromagnetic field of EVT couple seriously...
The self-sensing magnetic bearing technology offers significant cost savings and the potential for dynamics advantages due to its fundamental sensor-actuator collocation. This paper proposes a rotor displacement self-sensing scheme for the permanent magnet bias magnetic bearings (PMB) using three-level amplifier demodulation. Based on the proposed structure of radial PMB, the self-sensing principle...
This paper proposed an analytical method for the calculation of electromagnetic toque in a Permanent Magnet-assisted Synchronous Reluctance Motor (PMASynRM) based on equivalent magnetic network model. The Fourier expression of the electromagnetic torque considering harmonic is theoretically analyzed and simulated. With the aim of reducing torque ripple, the effect of the flux barrier angle on the...
A new electric variable transmission in hybrid electric vehicle is analyzed. The equivalent magnetic circuit and finite element simulation model is established in this paper for analysis of internal magnetic field coupling law. As for the strong coupling relation in the internal magnetic field of electrical transmission, magnetic flux-insulation ring is the electrical the applied into the electric...
This paper presents a set of similarity laws appropriate for low speed switched reluctance machines design. Design methodologies of switched reluctance machines for low speed applications are generally oriented towards the choice of suitable combinations of stator and rotor poles in regular topologies. The proposed similarity laws provide an easy-to-use and robust methodology to compare different...
In the recent past the authors dedicated much work to small PM motor adopting permanent bonded magnets, and to the magnetization problems. Now it is largely proposed the so-called Halbach magnetization, presenting the directions of the magnetic induction variable along the magnet; its constitutes a tentative of sinusoidality for the magnetic induction component orthogonal to the magnet surface. It...
The design of high-speed electrical machines for flywheel systems should consider simultaneously electromagnetic, mechanical and thermal constraints. This paper presents the design of a 4-pole permanent magnet synchronous machine (PMSM) for a flywheel energy storage system, which is applied in an urban railway system. The machine has a maximum speed of 24000 min−1 and a rated power of 130 kW. A design...
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