Axial field flux-switching permanent magnet (AFFSPM) machine has the advantages of inherent sinusoidal back-EMF waveform, high power density, and large torque capability, which is suitable to use in electric vehicle (EV). However, the cogging torque of the AFFSPM machine is high and it is difficult to modify the flux, which limits the use in EV. In this paper, a novel multi-tooth axial field...
This paper proposes a novel partitioned stator flux reversal memory machine (PS-FRMM, which is geometrically similar to the magnetically geared machines having surface-mounted PMs and armature windings on two separate stationary bodies. The proposed machines offer the merits of alleviating the conflict between electric and magnetic loadings, and hence the armature slot areas can be increased...
With ever improving performance of rare earth permanent magnet (PM) material, PM machines have been widely used. PM vernier (PMV) machines, with the working principle of flux modulation effect, have gained increasing attentions due to their high torque density. Owing to the uniformly distributed ferromagnetic poles (FMPs), the fundamental magnetomotive force induced by rotor PMs interact with...
Theoretical IPMSM control technique is complicated, and reliability is low, because of the changing parameters. Further, in case of general look-up table designing method which obtains torque characteristics(according to current and speed) or torque characteristics(according to magnetic flux through the entire control region), obtaining a precise result can be difficult and has the...
The armature of a balanced armature receiver (BAR) is made by a soft magnetic material with a nonlinear B-H curve and a saturation value. Based on our previous research, the saturation of armature may affect the nonlinear magnetic characteristics, especial with a strong current or a big vibration displacement. As one of the nonlinear magnetic characteristics in electromagnetic field, the...
As an inherent nonlinear device, an analysis method of a balanced armature receiver (BAR) considering the nonlinearity, especial the nonlinear magnetic characteristics are important. From literature survey, the finite element method (FEM) could be considered as the most accurate analysis method. Thus, a mass of simulations with 3D FEM analyses are proposed in this paper to analyze the...
IPMSM is mainly used as the traction motor of HEV and EV, because it has the high torque density and the wide operating range. Especially the size limit of traction motor exists in HEV, because HEV system consist of the engine and the electric propulsion systems at limited space. Many studies have been conducted to maximize the torque of a single air gap IPMSM with the size constraints. In...
Rare earth permanent magnet motors are used in many industrial fields because of the advantage of superior output power density. Currently, however, non-rare earth motors have been actively studied due to the instability of rare earth supply and price fluctuations. Example of non-rare earth motors includes a synchronous reluctance motor (SynRM), a wound rotor synchronous motor (WRSM), a...
When motor is in operation, harmonic components are inevitably included. Due to the harmonic components, experimental results of motor performance is different from that obtained from FEA analysis, which assumes there is no time harmonic components. However, time harmonic components should be considered in performance analysis process, since time harmonic has effect such as noise and loss.Time...
The inverter system must be necessary for a high-temperature superconducting (HTS) synchronous motor control in any electric propulsion system such as ship, vehicle, and aircraft. HTS motors for electric propulsion are driven and controlled by pulse width modulation (PWM) input voltage with harmonics, which is made in voltage source inverter (VSI) by a various switching pattern. Therefore,...
A bearingless permanent magnet synchronous motor (BPMSM) is a new type of motor with the magnetic bearing function applied to the traditional permanent magnet synchronous motor. Besides of the simple structure, high efficiency, and high torque density, the BPMSM can operate with no friction, no wear, high-speed and high-precision, and so on, which show great potential application in many...
Recently, due to the rising issue of environmental pollution, secure process of rare earth material with high efficiency is increasing world wide. However, the price of the rare earth material has increased significantly by restriction of rare earth production in China, where more than 90% of rare earth material is produced. Therefore, non rare earth material, for replacing of rare earth...
A bearingless permanent magnet slice motor (BPMSM) has compact structure and high efficiency, which can realize the rotor magnetic suspension at five degrees of freedom. The rotor magnetic field oriented strategy can realize the decoupling control of torque and suspension force, but it is difficult to meet the high performance requirements of torque and suspension force. The theory and method...
This paper studied on the comparison of traction motor for same size with sintered rare-earth magnet and bonded Dy free magnet. We designed PMASynRM with bonded Dy free injection magnet by changing only rotor and experimented to verify performance at the same size IPMSM with sintered rare-earth magnet. We simulated the magnetic orientation of the injection Dy free magnet to make the...
Fault-tolerant permanent-magnet (FTPM) machines provided high efficiency, good fault-tolerant capability and high reliability. The electromagnetic torque of FTPM machine contains both permanent magnet (PM) and reluctance torques. At high speed operation condition, high reluctance torque can not only help prevent machines out of control when using flux weakening control method but also...
Axial field flux-switching permanent magnet machine (AFFSPMM) has the advantages of inherent sinusoidal back-EMF waveform, high power density, and large torque capability, which is suitable to use in electric vehicle. The investigated AFFSPM machine is composed of two outer stators and one inner rotor both with a doubly-salient structure. The stator contains 12 modular U-shaped laminated...
It is well known that the shape of a magnet pole has a significant influence on the air-gap flux density distribution, back-electromotive force harmonic and torque ripple in surface-mounted permanent magnet (SMPM) motors. In general, reducing the torque ripple by changing the shape of the permanent magnet (PM) has a negative effect on the electromagnetic torque and increased cost. This paper...
A novel separated pole-piece type ferrite magnet motor (FMM) is comprises pole-pieces and webs separated from each other in order to maximize its magnetic performance and to minimize leakage flux. However, since such disconnected pole-pieces and webs are constrained only by end plates and rivets, the motors are vulnerable in terms of mechanical integrity at high rotating speeds (and thus under...
An internal permanent magnet synchronous motor (IPMSM) has a high output density per volume but has non-linear characteristics due to a beta angle control. Moreover, it is also difficult to precisely control by changing the motor parameters in a nonlinear manner with magnetic flux and torque according to load and temperature characteristics during operation. Therefore, we propose a new...
In this paper, permanent magnet assisted synchronous reluctance motor (PMa-synRM) is designed for electric vehicle propulsion system. Synchronous reluctance motor (synRM) does not contains magnet, so that the cost of the motor remains low even the price of the rare-earth magnet increases dramatically. Moreover, it has advantage on high power density due to its structure and thermal robustness...
In order to reduce the heavy rare earth element, permanent magnet are continuously developing. Especially, maintain of high coercive force is a very important technology in motors that mainly use high currents. In addition, since the price of heavy rare earth element is high, the use of the rare earth element is minimized so that the price competitiveness of the motor is obtained. In this...
In the past two decades, bearingless permanent magnet synchronous motors (BPMSMs) have been researched widely. Because of the advantages of high efficiency, long operation life, no friction, and so on, the BPMSMs have the prospects to be widely applied in high-speed and high-precision mechanical processing and many other industrial fields. In the control system of the BPMSM, in order to obtain...
A bearingless permanent magnet synchronous motor (BPMSM) is a new type of motor, which inserts functions of the magnetic bearings into the traditional permanent magnet synchronous motor, and realizes the steady suspension and rotation of rotor at the same time. Because of its advantages, such as high efficiency, high power factor, good control performance, no mechanical contact, non-wear,...
In order to control and reduce the electromagnetic vibration of induction motors, the stress in motors cores, which is the inherent reason of vibration, should be computed accurately. Stress in induction motors is mainly generated from Maxwell electromagnetic force between the stator and rotor under the rotational magnetization excitation. The non-oriented silicon steel in motors shows...
The Brushless DC(BLDC) motor is getting more widely used in home appliances, vehicle and industry for its easy control method and low cost. For proper control of the BLDC motor, it is designed to have trapezoidal Back-EMF wave form and the square wave current is applied to its phase current which has instantaneous switching in its wave form. Although, in low speed or low phase current, the...
In this paper a novel magnetic field modulation linear primary permanent magnet synchronous motor (LPPMSM) is proposed, which is originated from brushless electrically excited synchronous machine ( BEESM ) .LPPMSM have short primary (rotor side), long secondary structure. The primary side consists of an iron core with salient teeth wound which 3-phase armature windings and permanent magnets...
This paper discusses a motor that was designed to satisfy the size constraints of system by using ferrite magnet and has the same performance as rare-earth magnet motor. In general, the size of the motor is increased in order to meet the same performance of motor using a ferrite magnet, because of its very low energy density compared to the rare-earth magnet. Thus this paper researched the...
Cogging Torque is essential torque component on permanent magnet motor having teeth and slots and also this is an important characteristic of some applications such as electrical steering motor which requires precision position control and lower acoustic noise. There had been investigated variety techniques to reduce cogging torque during several decades and most of them show common feature...
IEEE Standard 37.96-2000, Guide for AC Motor Protection, recommends the use of overcurrent relays for overload and locked rotor protection. Because of the familiar use of overcurrent protection, little attention is paid to the nature of motor thermal limit curves and their relation to winding temperature in an induction motor. Although thermal limit curves are defined in IEEE Standard...
In this paper, we study the robust torque control of wireless tram with independently rotating wheelsets(IRWs). In order to perform robust torque control of Interior Permanent Magnet Synchronous Motor(IPMSM) in the driving condition, D-Q axis current information are required. However, it is difficult to get appropriate current information, because of a lot of current vector exists for required...
