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This paper presents an adjustable field weakening control method for a high-speed permanent magnet motor (PMM). A compact designed PMM sometimes needs strong field weakening in the high-speed domain. The proposed control method adjusts field weakening to obtain enough torque for stability of 1MW/3.2kV/ 6600rpm-PMM operation.
A new control structure is presented for use at the sensorless control of speed for low speed range. That method uses an observer for position estimation. Such structure does not require the calculation of the speed value from the estimated back EMF, thus such drive can work even in a case of non-sinusoidal shape of estimated back EMF. Such structure is especially recommended for speed in a range...
This paper deals with the modeling, analysis and design of SPWM (Sinusoidal Pulse Width Modulation) controlled multilevel inverter fed PMSM (Permanent Magnet Synchronous Motor) drive. The concept of vector control is applied in PMSM to obtain linear dynamics similar to DC motor and the concept of SPWM is applies to produce the controlled switching pulses to multilevel inverter. The five level cascaded...
PMSM applications in high-performance control, with or without sensors, involve well self-tuning of the controllers and observers to machine parameters with off/on-line identifications for “plug-in” controllers. This paper proposed self-commissioning methods to automatic identify the PMSM electrical parameters (stator resistance, dq-inductances and PM flux) in sensorless drives, sometimes the rotor...
The rapid development of fully electric vehicles, their charging systems and their increasing availability to the general public presents both the automotive industry and consumers with some new challenges. Electromagnetic compatibility has been well understood by the industry, but the deployment of high power inverter drives as part of the powertrain is currently not covered by automotive EMC standards...
High order harmonic flux and current of permanent magnet synchronous motor (PMSM) are generated by the distortion of air-gap magnetic field and the nonlinear characteristics of inverter, resulting in the ripple of electromagnetic torque. In this paper, a novel harmonic compensation algorithm was proposed to solve this problem. Based on the harmonic model of the PMSM, harmonic voltage is injected to...
The paper proposes a symmetrical six-phase PMSM two-motor drive system which consists of a six-phase PMSM series-connected with a three-phase PMSM driven by a single inverter. This enables full decoupling vector control of the two machines. Detailed mathematical modeling of the system is presented. A simulation model with vector control is constructed by Matlab/simulink. The simulation results show...
In this paper, a high voltage driving method using low rated voltage devices for Switched Reluctance Motors (SRM) is proposed. In conventional driving circuit for SRM an asymmetrical H-bridge inverter is usually used, the maximum motor voltage depends on the rated voltage of the switching device. Then, the demand of increasing the motor voltage due to increasing rotational speed results to increase...
This paper proposes an approach to simplify the proposed halt sequence of an inverter without the pole position information of a permanent magnet synchronous motor. When the Back-to-back (BTB) system with a small capacitor is stopped by the grid faults during motor regeneration, the DC-link capacitor voltage is increased rapidly if all gates in the BTB system are turned off at the same time. Therefore,...
This paper presents the development of an open loop model of a Permanent Magnet Synchronous Motor (PMSM) drive fed from a 3 phase bridge inverter and operating under self-control mode with the rotor position information. Permanent Magnet Synchronous Motors (PMSM) are widely used in AC servo drives because of its high torque to inertia ratio, high power density, high efficiency and power factor as...
A 2D-3D hybrid finite element method (FEM) approach is proposed for fast analysis of eddy current loss in magnets of permanent magnetic synchronous motors (PMSM) driven by a pulse width modulation (PWM) inverter. A voltage-source PWM inverter circuit coupled 3D FEM model of a PMSM was built with the commercial FEM code JMAG and the eddy current loss in the magnets of the PMSM was calculated which...
This paper presents a novel hall sensor fault detection and fault tolerant control system for Hall Effect position sensors failure of permanent magnet synchronous motor. The proposed system is capable to accurately detect and promptly identify exactly which of the Hall Effect sensors has undergone breakdown when the fault occurs. A simple method to generate the commutation signal even with faulty...
In recent years direct torque control (DTC) has become an alternative to the well known vector control especially for permanent magnet synchronous motor (PMSM). But it presents a problem of field linkage and torque ripple. In order to solve this problem the conventional DTC is combined with space vector pulse width modulation (SVPWM). This control theory has achieved great success in the control of...
This paper presents a performance comparison study between the proposed continuous- and discontinuous-hybrid-PWM (C-HPWM, D-HPWM) based techniques used for neutral point clamped (NPC) 3-level inverter. The H-PWM strategy uses both the advantages of carrier and space vector based PWM strategies. The duty cycles are generated using the carrier based strategy to reduce the computational complexity of...
A traction motor system of electric vehicles (EVs) requires wide torque-speed operation range, high efficiency, and low torque ripple according to its driving point. To achieve the requirements without increasing motor size, a novel variable characteristics motor system is proposed in this paper. A winding structure is studied to reduce unprofitable conductor which makes conduction loss. The developed...
A torque control method for permanent magnet synchronous motor (PMSM) in flux weakening region has been proposed. However in particular case, current control response of proposed method becomes oscillatory. Therefore, stable operating condition is analyzed in this paper. It is revealed that the gain of transfer function from feedback component of voltage phase angle to actual q-axis current is increased...
The permanent magnet synchronous motor (PMSM) has many advantages, such as high energy density, high efficiency and high power factor, and its application in electric vehicle is rapidly expanding. The traditional main circuit structure of three-phase three-leg topology with the space-voltage vector pulse width modulation (SVPWM) technology can reduce the winding harmonic currents and meanwhile improve...
In the AC servo system, the output voltage is restricted by inverter output limitations. Voltage saturation occurs as a result of this limitation. The settling time of current and speed increases because of voltage saturation. This paper proposes a new control system for the rapid and stable speed response of surface permanent magnet synchronous motor (SPMSM) by using the proposed feedforward flux-weakening...
This paper introduces a new concept of power generation system called the motor-assisted gas turbine (MAGT). In the MAGT, a dual-shaft gas turbine and a motor drive are included. The conventional dual-shaft gas turbine has two shafts with different rotational speeds: a power turbine shaft and a compressor shaft. The power turbine shaft is connected to a generator and is rotated at a certain speed...
In this work a simple low-cost open-loop speed control technique has been developed for Permanent Magnet Synchronous Motor (PMSM) without damper winding. The problem with rotor position sensor-less open-loop control of PMSM without damper winding is its inherent instability at higher speed. It is identified in this work that the rate of change of motor terminal frequency and voltage are the two key...
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