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This paper presents an adaptive position observer with permanent magnet flux estimation for permanent magnet synchronous motor in a drive system. The new nonlinear adaptive position observer for the permanent magnet synchronous motor is designed relying on stator current, voltage measurements and the speed information. Then, an adaptive flux constant estimator is constructed to generate the flux constant...
In this paper, a new sensorless detection scheme for PMSM is presented. This detection scheme consits of PMSM's mathematical model and the flux-linkage observer. The mathematical model is used to approximate the nonlinear system of PMSM. Due to the current modification scheme with error-correction fashion, as detailed in this paper, the actual rotor position and the machine speed can be estimated...
This paper proposes the predictive controller design for a sensorless interior permanent magnet synchronous motor drive system. The predictive controllers include a current-loop predictive controller and a speed-loop predictive controller. By using the proposed control algorithms, the closed-loop sensorless interior permanent magnet synchronous motor drive system can achieve fast transient responses,...
This paper presents an initial rotor position estimation method for low saliency interior permanent-magnet synchronous motor (IPMSM) drives. The method injects signals into the stationary α-β frame of the motor and substitutes the injected signals into the stationary α-β frame model of the motor to solve for the rotor position. In particular, the method injects specific signals into the motor to eliminate...
Sensorless techniques have got considerable importance in IPMSM drives researches. In the two past decades, a number of High Frequency Signal Injection (HFSI) techniques have been proposed and developed for IPMSM rotor position estimation at standstill and low speed. These techniques are divided into transient signal injection techniques, which are based on exploiting the PWM signal to extract the...
This paper aims to carry out a comparative study on techniques used for position sensor faults detection in PMSM drives. Fault detection algorithms are developed based on wavelets decomposition, and especially multiresolution analysis (MRA) technique, and parity equations method. The considered fault is the loss of encoder outputs information in a PMSM drive with flux oriented control (FOC). Simulation...
Precise speed control of an Interior Permanent Magnet Synchronous Motor (IPMSM) drive becomes a complex issue due to complex coupling among its winding currents and the rotor speed as well as the nonlinear nature of the developed torque. The system nonlinearity becomes severe when the IPMSM drive operates in the field weakening region. The main purpose of this paper is to present the implementation...
An analysis of permanent magnet synchronous (PMS) motors is carried out to establish a basis for high performance control of the motors. It is then used to formulate vector control and direct torque control of the machines. This provides an insight into the advanced AC motor control methods in general and into vector control and direct torque control in particular, providing new opportunities for...
PMSM drives are the upcoming drives nowadays as these have many advantages such as high efficiency, high speed, high torque to inertia ratio, high torque to current ratio etc., The estimation of PMSM drive parameters is an important consideration in their field. Many methods are available for this. However the optimal way to estimate the parameters is normally preferred making use of neural networks...
This paper aims at the following control schemes of the IPM-SM drive, (i) A closed-loop direct torque control of an IPM-SM for variable speed drive with speed/position sensor, (ii) A speed and position sensor-less direct torque control scheme of the IPM-SM drive. To achieve closed loop control of torque and stator flux linkage, two PI controllers has been used; whereas to generate reference voltage...
A position sensorless Surface Permanent Magnet Synchronous Motor (SPMSM) drive based on flux angle is presented in this paper. The motor equations are written in rotor fixed d-q reference frame. A PID controller is used to process the speed error to generate the reference torque current keeping the magnetizing current fixed. The estimated stator flux using Recurrent Neural Network (RNN) is used to...
Field Oriented Control (FOC) Permanent Magnet Synchronous Motor (PMSM) is a commutator less servo drive which provides high controllability, greater efficiency, superior torque to inertia ratio and high power density. However, the performance of FOC-PMSM depends on the driver circuits, which requires expensive computing elements. Besides, an intelligent current regulator is desired for a highly precise...
In high-power current-source inverter (CSI) fed drives, reduction of losses in semiconductor devices and dc-link inductor through the dc-link current minimization is one of the primary goals. In this paper, a control strategy for the high power CSI-fed interior permanent magnet (IPM) drive is proposed for this purpose. This control strategy keeps the dc-link current at minimum level without exceeding...
The reliability of the PMSM drives is the one of critical factors in several industries, in particularly, the areas where the precise operation and/or high performance are required. This paper proposes a novel diagnosis scheme using Extend Kalman Filter (EKF), especially, in subject to the open-phase faults of the inverter switches. The stator resistances of PMSM are estimated by the EKF in real time...
Externally excited synchronous machines exceptionally suit the needs of axle drives in automotive applications due to their high efficiency over the whole operation range and the advantages for the realization of the functional safety. With the rotor current giving an additional degree of freedom new possibilities and necessities come up, bearing special challenges regarding the control. A loss minimum...
The paper describes a Direct-Flux Vector Control (DFVC) scheme suitable for synchronous Permanent Magnet (PM) drives employed in applications that require motor flux-weakening operation, as happens for traction drives. The proposed controller operates in stator flux reference frame and can be easily adapted for Surface-mounted PM (SPM) and Interior PM (IPM) motors. The stator flux is directly controlled...
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...
Recently, sensorless controls, which eliminate position and speed sensors in a permanent magnet synchronous motor drive, have been much studied. Most sensorless control algorithms are based on the back-EMF and speed estimations which are obtained from the voltage equations. Therefore, the sensorless control performance is largely affected by the parameter errors of a motor. This paper investigates...
Drives based on permanent magnet synchronous machines become more and more popular in many industrial applications. In most application traditional control algorithms are used leading to problems with the drive operation optimization. The paper presents a method of field weakening implementation in model based predictive control scheme.
In this paper, a new technique for on-line detecting inter-turn stator winding fault in Permanent Magnet Synchronous Machine (PMSM) is presented. It is based on a residual analysis improved by adding a back-EMF waveform estimation system which allows identifying real back-EMF frequency components of the healthy machine. Then, a simple current residual monitoring permits us to detect the fault and...
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