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High power density, high speed operation, high efficiency and wide speed range made the interior permanent magnet (IPM) synchronous motors an interesting choice for ac drive systems. Different control strategies have been proposed to reach a high performance drive system. Direct torque control (DTC) is one of these widely used methods which has fast torque dynamic and a simple structure. Different...
In the last decades, fault diagnosis of voltage source inverters has received a lot attention since their application to variable speed drives has become an industrial standard. Recently, some methods have been suggested for open-circuit faults in the switching devices of voltage source inverters. However, most of these methods might not work properly for different working conditions of the motor...
This paper proposed a new switching scheme for controlling permanent magnet synchronous motor (PMSM). The voltage source inverter (VSI) is represented as event driven system with 23 modes of operation. The switching among these modes is governed by the supervisory control approach. The salient future of the switching control is system order reduction, decoupling in the design procedure, insensitivity...
This paper presents a study of axial flux permanent magnet synchronous motor (AFPMSM) drive system. An internal model control (IMC) strategy is introduced to control the AFPMSM drive through currents, leading to an extension of PI control with integrators added in the off-diagonal elements to remove the cross-coupling effects between the applied voltages and stator currents in a feed-forward manner...
Since there's a biggish output ripple in current direct torque's control, we design a direct torque control system for three-level inverters used in asynchronous motors by analyzing the operational principle of the diode clamped three-level inverters, and simulation is done as well. Ripples of the torque and the rotational speed of the motor can be deduced effectively, and a stable output and a good...
An intelligent liquid-state soft starter is made by connecting in series a special resistance to motor stator circuit. Using embedded control technology and an intelligent control algorithm, the speed, the rise and fall of the movable polar plate can be changed, and the resistance can be changed accordingly. With liquid-state resistance reducing gradually from maximum to zero, motor can be accelerated...
Interior permanent magnet synchronous motors (IPMSMs) are employed for drive motors of electric and hybrid vehicles. Therefore, the control method in overmodulation range of inverter is important for fast torque response and expanding operation range of IPMSM. In this paper, the control methods based on perfect tracking control and PWM hold model are proposed in overmodulation range. The proposed...
This paper propose a new current control system for IPMSM to reduce harmonic currents caused by the overmoduration and a non-sinusoidal magnetic flux distribution on the rotor. The harmonic currents have problems with making a current control system of IPMSMs unstable easily. The proposed current control system has two current controllers. One of them controls fundamental current to satisfy the required...
Electric drives for automobiles require at low speed for starting a torque which is a multiple of the rated torque, and for above rated speed a torque which is about the rated torque. Known (V/f) control results in a decreasing torque above rated operation while the (V · p)/(f · N) control -where the terminal voltage V = Vt is less or equal to Vrated, the number of series turns of the stator winding...
This paper presents a novel low cost Inverter to drive a Spindle motor at high speed with high starting torque using bipolar starting and unipolar running algorithm. The proposed inverter consists of 8 switches, which is a far less count as compared to some of the existing inverter topologies for driving a Spindle motor. With the proposed inverter Spindle motor can achieve high starting torque with...
This paper introduces two torque ripple suppression control methods for permanent magnet synchronous motor. With a system identification technique, the system model from compensating current input to torque detection output can be expressed as the speed-adjustable 1-dimension complex vector in the coordinate system synchronizing with the torque ripple frequency. The first method introduces a periodic...
In this paper, Direct Torque Control (DTC) algorithms for dual three-phase induction motor fed by six phases Voltage Source Inverter (VSI) is described. The induction machine has two sets of three-phase stator windings spatially shifted by arbitrary angle. The machine dynamic model is based on the vector space decomposition theory. Optimal switching strategies to control the machine for different...
This paper describes a fast torque control system of permanent magnet synchronous motor (PMSM) based on model predictive control (MPC) considering overmodulation region of inverter. In overmodulation region, output voltage of inverter contains harmonic voltage which influences performance of current control and can't be avoided. To consider influences of harmonic voltage, we use a harmonic voltage...
The three-level inverter and the combination of direct torque control method used in induction motor, designed a simple direct torque control method of twelve vector by use of diode-clamped three-level inverter, in the same as highly torque control accuracy. The result shows that it has simple, fast response, high torque control accuracy Benefits. The control scheme used in high voltage control motor...
With increasing performance of magnet material and decreasing cost permanent magnet synchronous machines (PMSM) become more and more important for practical use in light railway and e-car applications. Excellent torque dynamics are extremely important in these applications - not because of acceleration or deceleration, but to meet additional demands as slip-slide protection and electronic stability...
The excellent control system of winder could significantly increase production capacity, improve paper quality, as well as reduce paper losses. The AC and high speed winder had a high-precision and automatic drive control system, which consisted of 6SE70 inverter as AC drive control device, Siemens S7-400 PLC as controller, and touchscreen OP270 as screen displaying the given input and current status,...
This study presents a novel means of designing a simple and effective torque control for Permanent Magnet Synchronous Motor (PMSM). The overall stability of the system is shown using Lyapunov technique. The Lyapunov functions used contain a term penalizing incremental energy of control error, torque and stator flux, enhancing the stability. A new logical FPGA torque controller and flux observer based...
This paper introduces the structure of the double AC motors speed-regulating experimental system and control methods of the system, and describes the application of the STM32 microcontroller: hardware module design and programming. With the SVPWM technology, software flow chart based on STM32 MCU is also given. Compared with traditional speed control system, this system has high efficiency and energy...
This paper deals with the development of a test bench for mild hybrid drives used in construction machines. Due to the special conditions under which construction machines are operating this test bench needs to be adapted. Hence the bearing of the electrical drive, which is mounted directly to the internal combustion engine, the temperature control by a cooling circuit and the integration of an appropriate...
A Direct Stator Flux and Torque Control (DSFTC) scheme for asymmetrical six-phase induction motor drives is discussed in this paper. The induction machine has two sets of stator three-phase windings spatially shifted by 30 electrical degrees with isolated neutral points. The proposed control strategy is very simple and it is based on Proportional Integral (PI) regulators implemented in the stator...
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