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In order to achieve sensorless control for permanent magnet synchronous motor (PMSM), an observer based on model reference adaptive system (MRAS) is designed to estimate the rotor speed according to the mathematic model. A speed sensorless vector control system is established and simulated with Simulink. Simulation results show that the MRAS-based control system, which is able to implement the speed...
To meet the need of main drive motor and the low speed high torque requirement of load, a synchronous motor and gear reducer were used .However, they have many serious drawbacks, such as high cost, low transmission efficiency ects. In this paper, a novel structure of motor which the number of slots per pole per phase q is less than 1 was proposed. It can solve the problems in direct drive system and...
This paper presents a speed controller for an interior permanent magnet synchronous motor (IPMSM) based on adaptive backstepping method. IPMSM speed is acquired through extended-EMF method, which is simple to achieve and has a good dynamic performance. A novel nonlinear control strategy, backstepping, is used to design speed tracking and current controllers. The system can achieve fast speed tracking...
This paper proposes maximum torque control of IPMSM drive using multi model reference adaptive fuzzy controller (Multi-MFC) and artificial neural network (ANN). This control method is applicable over the entire speed range which considered the limits of the inverter's current and voltage rated value. For each control mode, a condition that determines the optimal-axis current for maximum torque operation...
Direct torque control (DTC) of interior permanent magnet (IPM) synchronous motors is known to deliver fast torque and flux dynamic responses. However, the poor flux estimation at very low speeds has been its largest drawback. A multitude of flux observers have been proposed for flux estimation but most of them fail to fare in the low speed region. This paper proposes a new stator flux observer for...
This paper proposes a new speed sensorless direct torque and flux controlled interior permanent magnet synchronous motor (IPMSM) drive. Closed-loop control of both the torque and stator flux linkage are achieved by using two proportional-integral (PI) controllers. The reference voltage vectors are generated by a space vector modulation (SVM) unit. The drive uses an adaptive sliding mode observer for...
To solve the problems of torque ripple and inconstant switch frequency of inverter in the conventional direct torque control (DTC) for permanent magnet synchronous motor (PMSM) drive, a novel DTC method using space vector pulse width modulation (SVM) is proposed based on analysis of PMSM mathematical model. In this novel DTC system of PMSM , traditional torque hysteresis controller and flux hysteresis...
The transient and steady state operations of a closed loop variable speed 6-pulse PWM inverter-fed permanent magnet synchronous motor [PMSM] drive system are simulated. Performance of the system covering important operational aspects while using a hysteresis controller or a modified predictive current controller were evaluated over a wide range of speed. Comparison of the results provide insight into...
In the wind energy conversion system, the wind turbine captures the wind energy. Then the generator changes it to the electrical power. So the characteristic of the wind turbine is very important. For some laboratories that donpsilat have the practical wind turbine, it is very convenience to use the wind turbine simulator instead of the real wind turbine. The paper introduces the structure and characteristic...
Extended Kalman filter observer for the direct torque controlled permanent magnet synchronous motor drive is talked about, the estimation schemes for PMSM rotor initial position and rotate speed are obtained. Direct torque control is studied. The PMSM rotor initial position is indispensable to sensorless PMSM direct torque control systems. High frequency voltage signal is injected into stator winding...
The paper presents a direct-torque-control scheme for a direct drive variable-speed permanent magnet synchronous generator (PMSG) for wind energy without any position sensor. Direct control of the rotating velocity and amplitude of the stator flux vector allows very fast torque response of PMSG according to the generator speed. Fixed switching frequency and very low torque ripple are obtained with...
A nonlinear adaptive robust speed tracking controller is presented for a three-phase surface permanent magnet synchronous motor (SPSMS) considering the control strategy of maximum torque control (MTC) related to this motor. Ignoring the motor iron losses, the proposed controller is designed based on combination of input-output feedback linearization (IOFL) control and adaptive sliding mode technique...
In AC servo drives, the rotor position and measured stator currents of permanent magnet synchronous motor (PMSM) are required as feedbacks of drive system. The rotor position of PMSM is very important variable to be known correctly to obtain the optimal torque per ampere from the motor. Unfortunately, manufacturerspsila position sensor datasheets may not include the angular relationship between the...
Unreasonable torque ripple in the permanent magnet synchronous motor (PMSM) direct torque control (DTC) drives is caused by the inconsistency between the actual effect on torque of the voltage vector and the exception of the switching table. In order to solve this problem, the number of available non-zero voltage vectors is up to 12 in a sector by dividing stator flux circle into 12 sectors and the...
This paper presented a methodology for real-time prediction of the torque availabilities of an interior permanent magnet (IPM) synchronous machine and a high voltage (HV) battery sub-system for hybrid electric vehicle (HEV) applications. Having the torque availabilities information available to vehicle system control (VSC) in real-time can ensure the optimal vehicle operations, while reducing vehicle...
Field oriented control (FOC) may be used for simple high-power synchronous drives, such as pumps and fans, to unify system with asynchronous drives. But distinction is strong influence of torque component of current on flux. Internal feedback in control object is investigated. This feedback becomes positive one in definite regimes. A simple addition in control is proposed, based on features of control...
This paper deals with a model predictive control of permanent magnet synchronous motors applied to electrical antiskid braking system. A direct torque controller is proposed instead of two cascaded model predictive controllers for torque control and current control respectively. The nonlinearities due to the coupling terms with the speed and the current are taken into account into the controller derivation...
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