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An estimation method for sensorless control employing a test signal based reference model is presented. The method estimates the slip frequency by a comparison of the measured impedance curve while the machine is in operation with the reference model curves. The reference model is measured during DC magnetisation of a cold machine at steady state and constant rotor flux linkage. During normal machine...
This paper reports on inverter nonlinearity effects on sensorless control methods based on high-frequency signal injection (HF-injection). Inverter output voltage distortions and their influence on position detection are described analytically and their compensation is discussed. Furthermore it is pointed out that the effects of inverter nonlinearities on sensorless control depend on whether the rotating...
The comparison of inductive and capacitive filter for standalone variable speed operated doubly fed induction generator DFIG is presented in the paper. Simulation and experimental results of both methods of filtration are shown. The model equations with stator connected filtering capacitors are analyzed. Sensorless control of the stator voltage vector in the polar frame is described. PLL based frequency...
It has been reported that the fundamental space vector PWM (SVPWM) waveforms of both a DC link voltage source inverter (VSI) and a matrix converter (MC) can be used as excitation signals for position estimation of a permanent magnet synchronous motor (PMSM). This paper evaluates the quality of the position estimates as well as the influence when the sensorless algorithm is implemented on a VSI and...
This paper addresses the sensorless control scheme of induction machines using transient voltage excitation at zero and low frequencies. The method is based on saliency detection through the use of pulse excitation and the evaluation of the response of the machine line currents changes. Different signal processing structures are necessary for the rotor position estimation. The estimation algorithm...
This paper presents the characteristics and the performance of a 75 W-19 V ac-dc adapter for notebook PC tailored on the latest Energy Star Program requirements. The power supply is composed of a front-end PFC pre-regulator and a Flyback downstream converter. An innovative PFC control circuit sensing both the input and the output voltages through an auxiliary winding is the key element in achieving...
This paper presents a signal injection method without torque variation for the position sensorless control. Proposed method utilizes the maximum torque control frame that makes torque ripple caused by a signal injection minimized. It is proved from the definition of the maximum torque control frame and evaluated by experimental results.
This paper proposes the sensorless control system of induction motor using the observer gain tuning and high frequency injection techniques. The high frequency injection is activated by the condition of observer gain k. The high frequency injection technique is based on magnetic saliencies caused by the saturation and high frequency injection.
This paper investigates the problem of single-phase induction motor (SPIM) sensorless speed control. A discrete time PI controller and a sensorless technique are implemented on a PC-based platform using a standard three-phase inverter drive and vector control. An indirect rotor flux oriented control technique is developed based on a sensorless technique. A MRAS with a Kalman filter algorithm is developed...
This paper presents an improved direct torque control (DTC) method for sensorless matrix converter drives using a multi-mode indirect space vector modulation (ISVM) and an adaptive sliding mode observer. The drive system is characterized by reduced torque and flux ripples, unity input power factor, sinusoidal input/output waveforms and good sensorless control performance over a wide speed range, while...
The aim of this paper is to present the method of sensorless control of super high speed permanent magnet motor. The extended Kalman filter (EKF) is considered as the speed observer and some aspects of using it (including tuning the covariance matrixes) are presented in the paper. The start-up process as well as the steady state is taken into consideration.
In this paper, a Doubly Fed Induction Machine (DFIM) operating in motor mode and supplied by two Voltage Source Inverters (VSI), in stator and rotor sides, is presented. The aim is to analyze the position sensor fault effects on a Direct Torque Control (DTC) of the DFIM. This justifies the necessity of a reconfiguration control when a position sensor fault appears in order to avoid an interruption...
Two encoderless control methods for permanent magnet machines are compared for automotive applications. At low and zero speeds, model based methods cannot be utilised, and therefore a saliency tracking method is needed. A ldquod-axis injectionrdquo method and a ldquocurrent derivativerdquo method are evaluated in terms of quality of position signal and additional current distortion introduced. The...
This paper gives a view about a standardized implementation of a combined INFORM/EMF-model to cover the full speed range of sensorless permanent magnet synchronous motor drives. A special feedback loop returns the output information of the observer to the integrating voltage model. Thus, a stable operation with high robustness against parameter uncertainties and low frequency disturbances is achieved.
The paper deals with a sensorless control of a permanent magnet synchronous motor drive for a hybrid electric catamaran. A surface-mounted permanent magnet motor has been chosen and a distinctive sensorless control of this machine is deeply described. Control performance is validated by simulation and experimental results. Start-up mode, reversal of speed and synchronization lost occurrence will be...
This paper discusses the sensorless control capability of an outer rotor PMSM with two different concentrated stator coil winding configurations resulting in a single- and double-layer configuration at same machine geometry. As a key parameter the differential inductance in direct and quadrature axis over current load is measured and compared. Furthermore the steady state short circuit current is...
This paper describes a new estimation method of rotor position for 3-phase SRM based on the space vector of the phase inductance at standstill and during rotating condition. The rotor position is simply obtained without magnetic characteristics of the motor and additional hardware. In this method, assuming the phase inductance waveform to be sine wave, the rotor position is obtained by computing the...
A sensorless control system for a surface mounted permanent magnet (PM) machine is developed which uses measurement of motor current derivative during the fundamental PWM vector excitation only. Vector extension is required when the vector width falls below a minimum time duration. The extension is made to allow the high frequency switching oscillations due to parasitic capacitances in the drive to...
A sophisticated simulator of permanent magnet synchronous machine (PMSM) drive was developed and is used for research into model-based sensorless control strategies. In this paper, we focus on estimators based on the extended Kalman Filter (EKF). The limits and possible improvements of the EKF are investigated using the developed simulator and real data recorded on designed laboratory prototypes of...
The full-order Luenberger flux observer (FOLO) combined with adaptive techniques is the most widely used method for sensorless induction machine (IM) vector controlled drives. However, IM model-based sensorless schemes have an inherently unstable region under regenerating conditions. Additionally, the stator resistance is also required at low speeds, which leads to a complicated multiple-input multiple-output...
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