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Recently a novel electric hammer driven by tubular permanent magnet linear synchronous motor (TPMLSM) has arouse great interest among researchers in the field of deep drilling for its distinctive advantages compared with hydraulic and pneumatic hammers. The working temperature in deep down-hole is relatively high, so the research of the influence of high temperature in deep hole on the electromagnetic...
This paper presents a rotor position estimated method of a five-phase IPM motor based on high-frequency sinusoidal voltage injection to improve the sensorless control system performance at low speed for electric vehicles. The high-frequency sinusoidal voltage is injected into the estimated rotor reference frame. The estimated rotor position and speed are obtained by detecting and processing high-frequency...
The thrust and levitation force of the long stator linear synchronous motor (LSLSM) are key points to evaluate the performance of the maglev train. However, it is not easy to be achieved due to the non-linear and dynamic coupling characteristics between thrust and levitation force. In this paper, the finite element analysis model of long stator linear synchronous motor is built for analyzing the thrust...
When designing a very-high-speed (VHS) machine, it is crucial to evaluate the windage losses accurately, because they are an important part of the total losses. It is therefore important to validate a reliable model, further used for the design and optimization of the motor. In this paper, an empirical windage loss model has been compared to measurements on a motor running up to 155 krpm in a pressure...
A novel tubular transverse-flux flux-reversal permanent magnet linear motor (TTFFRPMLM) for long stroke applications is designed and analyzed in this paper, which not only has the low cost advantage of the existing flux-reversal motor (FRM) by combining both PMs and armature coils in short primary, but also can address the problem of complicated structure of the existing transverse-flux motor (TFM)...
A hybrid high temperature superconducting (HTS) linear synchronous propulsion system composed of a HTS linear synchronous motor (HTSLSM) in the middle and HTS magnetic suspension sub-systems on both sides has been proposed for a high-speed maglev train. Four carriages have been made up for the proposed maglev, and each carriage consists of four HTSLSM modules, which weight 45 tons. The maglev train...
The modal analysis plays an important role in analyzing the vibration and noise of the motors. The models of the stator which are based on the interior permanent magnet synchronous motors (IPMSM) by the 3D finite element software are analyzed. Firstly, it is significant to simplify the stator rind by considering the different components. Then the relationships of the different parameters of the stator...
With the development of technology, The power density of permanent magnet synchronous motor application in aerospace is increasing rapidly. The integration of the machine with the power electronic converter and control system has many advantages such as high power density, high reliability and small size, etc. However the cooling design of it is challenging [1]. In this paper, the optimal design of...
Low switching frequency operation is one of the most effective methods to reduce the switch losses in high-power industrial machine drives. However, a low switching frequency would affect the operation performance, e.g., harmonic distortion in the stator current, modulation delay and so on. With an electrically excited synchronous machine (EESM) being taken as the high-power drive load of a two-level...
This paper analyzes the resonance phenomenon that occurs in the uncontrolled slave motor of two surface mounted permanent magnet synchronous motor (SPMSM) drives, connected in parallel to a single inverter. This phenomenon is observed when the inverter is controlled by the master-slave method, due to the differences in parameters between the two motors and load, during medium and low speed operation...
This paper presents a field-circuit coupled design and analysis method for the permanent magnet synchronous motor (PMSM) system used in electric vehicles. The time-stepping finite-element method is used to simulate the motor system, which integrates the electromagnetic field analysis of the motor prototype and the control algorithm of the drive system. A two-dimensional transient electromagnetic field...
Due to the space size of the vehicle itself and vehicle energy capacity constraints, hybrid electric vehicles (HEV) usually use high power density and high efficiency permanent magnet synchronous motor (PMSM) as the integrated starter/generator (ISG) motor of drive system, but the temperature rise caused by the losses in the process of running will lead to some problems. It is necessary to obtain...
Simulation of the thermo-electromagnetic properties of superconducting magnet exposed to the travelling magnetic field generated by a traditional stator was performed by resorting to the finite-element technique. A two-stage segregated modeling from a motor model to magnet model with unidirectional data transmissions was employed. Firstly, the motor model was calculated to obtain the magnetic field...
In this paper, a new current control approach applied in linear synchronous motor (LSM) drive system is proposed for traction-system. The proposed method is featured by adjusting the current proportions of paralleled converters in double-end supply. First, the theoretical model of LSM of double-end supply is established and the control strategy consists of an outer PI speed closed-loop, an inner current...
Taken permanent magnet synchronous motor with similar number of slots and poles as an object, in order to solve electromagnetic vibration problem, the restrain effect on electromagnetic vibration and its harmonies by auxiliary slot is researched in this paper. This paper analyzes the reasons of radial electromagnetic force wave by the analytical method. The influence of different numbers of auxiliary...
Restarting with speed for PMSM is critical to Rail Train application. And the switching frequencies must be restricted to several hundred hertz to minimize the switching losses. In order to output more torque with limited DC supply voltage, square wave should be used in the condition of high speeds. Hybrid synchronized PWM control schemes are often used to satisfy these restrictions. The restart and...
Based on the model of surface mounted permanent magnet synchronous motor, an improved algorithm for off-line parameter identification of motor is presented. In this paper, the single-phase sinusoidal AC signal is injected into the motor which can simulate the single-phase locked-rotor test and the DC signal is injected into the motor in order to simulate the DC test, then filtering the input signal...
An external rotor transverse flux motor has been proposed in our previous research, which has the advantages of low manufacturing cost and high torque density. In this paper, a novel transverse flux is introduced based on the foregoing motor's structure. At first, the detail motor structures and working principle are introduced. Then, the three-dimensional model of proposed motor is built by finite...
Compared to permanent magnet motors using rare-earth metals, a wound field synchronous motors tends to generate more heat due to increased windings, so it is required to consider cooling measures in design. In this study, a 3D computational fluid dynamics simulation and experimental verification of an 80kW Wound Field Synchronous Motor was performed to investigate the cooling performance of dual cooling...
The flux weakening control is significant for the interior permanent magnet synchronous motor to obtain a wide constant power range which is required in the electric vehicle application. A representative flux weakening method is to design an outer voltage loop using the voltage reference and the voltage limit. If the characteristic current of the motor is less than the current limit, the deep flux...
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