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The article describes a procedure for reduction to relative values of the flux linkage vector projection observer (one of the converters of the digital control system of the sensorless vector electric drive) as a result of which the fixed point part of the processor's ALU is used more efficiently and it becomes possible to apply the IQ-style of generating a computable code with the floating point...
In this paper a sensorless control method is presented for a matrix converter-fed synchronous reluctance motor. The method includes low speed and standstill operating regions. The fields of application are aerospace actuators where sensorless control augments the reliability of the drive, and robustness towards harsh ambient temperatures. The simulation results show the effectiveness of the presented...
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...
This paper presents a modified flux observer which is robust to the parameter variation. In this paper, the mathematical modeling of an interior permanent magnet synchronous motor (IPMSM) is shown and the proportional and integral (PI) current regulator with decoupling strategy is analyzed. The flux error terms from the current regulator are used to compensate the parameter variation. The proposed...
Induction machine drives have the potential to be a highly efficient candidate for variable load power conversion applications dominated by low per unit torque, medium speed duty cycles. To achieve efficiency, the key control variable is flux linkage, which is central to direct torque and flux controlled (DTFC) drives. Deadbeat DTFC drives, by switching at fixed rates, can seamlessly handle voltage/current...
Generally, a back electro-motive-force or flux observer is used for position sensorless drive of permanent magnet synchronous motors from middle to high speed range. Thus, the estimation accuracy of the observer influences position sensorless drive performance. This paper proposes a position sensorless drive system using the Hinfin flux observer in which the observer gain is designed by using the...
This paper presents an approach using high frequency signal injection to estimate the initial rotor position and magnet polarity for an interior permanent magnet synchronous machine (IPMSM). The method using rotating vector, carrier frequency excitation and heterodyning, tracking observers for position are discussed. A DSP-based drive system for this purpose is developed. To distinguish the polarity...
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