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This paper proposes a system that can actuate itself with wirelessly received power. The system consists of two coils with different purposes; the power-receiving coil wirelessly receives power from the external sinusoidal magnetic field, and the actuation coil controls the current for 1D self-actuation. The actuation current has a square waveform and is controlled to be in phase with the external...
This paper presents a method to measure the velocity of permanent magnet synchronous motors (PMSMs) by sensing the external stray magnetic field (SMF) outside the stator surface. First, a magnetic circuit model of PMSM was developed to analyze the distribution of SMF. The key is to sense the SMF by a magnetic sensor and extract the frequency through a zero-crossing comparison to obtain the velocity...
Engineering often requires magnetic bearings with sufficient capacity and to reduce the volume as much as possible at the same time. In this paper, the design principles of air gap, magnetic pole, rotor, stator, magnetic pole area and coils are given on the basis of practical engineering experience. Radial magnetic bearing structure with different shaft diameters and different magnetic poles number...
The failure rate of rotor bars is high, which causes large area of broken conducting bars, shortening the lifetime of motors. Therefore, the diagnosis of broken rotor fault diagnosis is of great importance. First, the mathematical model of induction motors is presented, and the internal and external magnetic field boundary conditions are defined. Second, frequency domain analysis method is combined...
Aiming at the problem of multi-DOF bionic drive, a new type of hybrid driven permanent magnet multi-DOF motor with liquid suspension mode is presented in this paper. The structure and working principle of the motor are introduced in detail. The analytical method and the finite element method are used to analyze the air gap magnetic field, and the results are compared and verified. In addition, the...
This paper presents an inter-turn short circuit detection through the measurement of external magnetic field of induction motor. The technique of analysis is based on discrete wavelet transform energy in transient state where the machine operates at start-up and standstill states. The wavelet offers a very fine analysis of the unidimensional and two-dimensional signals. Through multilevel discrete...
The performance of high-speed motorized spindle will directly affect the overall performance of high-speed machine tools, such as machining precision, processing strength and efficiency, vibration and noise, lifetime and so on. As one of the key R&D items of the motorized spindle design, motor control system is a nonlinear and strong coupling system. Based on the analysis of the control system...
Linear hybrid excitation flux reversal machines are very attractive for low cost long stroke applications due to their simple and cheap secondary structure. This paper proposes a new hybrid excitation flux reversal machines with consequent-pole permanent-magnet arrays first. Owing to the adoption of consequent-pole permanent-magnet arrays, usage of permanentmagnet material of the proposed machine...
For many industrial applications, upgrading the machine performance by changing the rotor structure while keeping or slightly modifying the stator structure is an economic and effective solution for complying with the existing production line. Electromagnetic torque is always one of the key factors that need to be evaluated. An intuitive and universal approach applying the same principle for torque...
Compared with other types of motors, solid rotor induction motor has the simplest and most robust construction. This good performance makes the solid rotor induction motors widely used in numerous high speed and high output applications. In this paper, the electromagnetic design process of an 18 MW, 12000 rpm solid rotor induction motor is discussed. In order to improve the rotor electromagnetic properties,...
This paper proposes a design technique of permanent magnet synchronous motor (PMSM) using hybrid type permanent magnet (PM) to consider simple structure and irreversible demagnetization. Here, the hybrid type PM is defined as using both of neodymium permanent magnet (Nd-PM) and ferrite permanent magnet (Fe-PM) in a rotor. For developing a competitive motor in terms of performance per manufacturing...
Permanent magnet (PM) machines have been widely applied over the past few decades, such as renewable power generation, electric vehicles, domestic appliances, etc.
The skewing is the most commonly used technique for noise minimization in induction motors. In order to take the skewing into consideration in FEM simulations, one should design a multi-slice 2D model or a 3D model, since the skewing affects the motor design along the shaft axis. As a consequence, the complexity of the FE model increases as well as the computational time, especially when the analysis...
This paper deals with the early detection of a rotor bar breakage through harmonics of the stator current and of the magnetic field in an induction motor proximity. The investigations are based on the 3D finite element model of a squirrel-cage induction motor.
One of the common faults encountered in 3 Phase squirrel-cage induction motors (IM) is broken rotor bar faults which constitutes nearly 7% of all the IM failure. In this work, a study on the electromagnetic characteristics of open-loop pulse width modulated (PWM) inverter fed IM is carried out under healthy condition & broken bar fault condition using Finite Element Method (FEM) analysis. The...
A 3D analytical model is developed for the computation of the no-load magnetic field distribution in flux reversal linear-rotary permanent magnet actuator (FR-LRPMA) with two PM poles (PM_pole) and two ferromagnetic poles (Fe_pole) on each stator tooth. Then a 3D model for calculating the air-gap permeance is presented considering the effect of stator slot and the permeance difference of Fe_pole and...
Despite the fact that the axial inductor machine is used in various economic sectors, such as aircraft, train - building, etc. there is not a lot of information available about 3D magnetic field calculations of this type of electrical machines, as well as its comparison with 2D calculations. The goal of this paper is to find out if 3D calculation is really necessary for magnetic field investigation...
This paper presents numerical simulation results of a passive magnetic bearing (PMB) used in Flywheel Energy Storage Systems FESS. The magnetic design, the modal analysis, aimed to outline the first six eigenmodes, and a kinetic analysis for the PMB with and without radial eccentricity are presented. These methods and results are valuable in the design phase of the PMB, for sizing its main parameters.
This paper reflects the evolution from the 2D to the 3D finite element analysis of the squirrel-cage induction motors related to the evaluation on the influence of the broken bar fault and the investigation of methods for the efficient fault detection. Based on the scalar 3D formulation of the electromagnetic field and through the step by step in time domain finite element solution, the time dependence...
The paper deals with the nonlinear analytical harmonic modeling (HM) of 3-phases, and 6-slots/4-poles switched reluctance machine (SRM). The proposed model consists in computing magnetic field distribution and static torque of a conventional winding distribution SRM. Because a SRM has inherently nonlinear characteristics, the analytical subdomain model which does not take into account the saturation...
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