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Interior Permanent Magnet Synchronous Motor(IPMSM) is used for wide applications because of its large torque density and high efficiency. However, IPMSM has large space harmonics and strong magnetic nonlinearity. The establishment of the dynamic characteristic analysis technique is required to examine control techniques to high performance and high efficient drive of IPMSM. In the paper, a new matrix...
This paper describes the MTPA (maximum torque per ampere) control strategy of Salient-pole PMSM (permanent magnet synchronous motor) and its flux-weaking control strategy. Salient-pole PMSM often used the MTPA control strategy, the method that MTPA curves obtained from look-up table is usually used, but it will reduce the real-time performance and reliability of the system. In this paper, electromagnetic...
Permanent magnet synchronous motors (PMSM) have been developed for numerous applications due to their attractive features especially after the development of rare earth permanent magnet materials as NdFeB or SmCo. However, the magnets on the rotor accentuate the thermal constraints and limit the high speed operation. To eliminate these drawbacks, a new Switching Flux Synchronous Motor with Hybrid...
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...
This paper presents a new control method for a torque ripple compensation of permanent magnet synchronous motors (PMSMs). The control method is based on a new equation to estimate the instantaneous torque. The equation can accurately take into account variations of both a magnetic energy and a magnetic co-energy. To achieve a stable and an effective torque ripple reduction, a feedforward control and...
Direct torque and flux control (DTFC) of interior permanent-magnet synchronous motors (IPMSMs) 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...
Based on the coordinate transformation theory and principle of electromechanical energy conversion, it is demonstrated that the rotor field-oriented control decouples not only flux and torque but also transformer electromotive force (TEMF) and motion electromotive force (MEMF). The field-oriented control of induction motor can be achieved by control of rotor motion electromotive force. A universal...
This paper presents the flux weakening control method of an open winding machine which is connected to the two isolated inverters. The methods of the current reference modification and the over voltage modulation of two inverters are proposed to enhance the flux weakening control of the open winding machine at high speed. Furthermore, the power flows through two inverters are controlled independently...
The knowledge of the real machine parameters is necessary for the calculation of the operating behavior, for the determination of the control circuit parameters when the machine is part of a control loop and last but not least for the verification of the predicted values obtained in the design phase of the machine. The known procedures for the measurement of the direct-axis inductance and the quadrature-axis...
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