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In this paper, a single-stage smoothing filter algorithm is used for the speed-sensorless field-oriented control of induction motors and is verified experimentally. Two well-known flux models of induction motor are used for estimation of rotor flux and speed. The uncertainties in measurement and model are accounted for. The experiment is carried out on a closed loop field-oriented control system....
This paper presents a new approach for broken rotor bars detection in induction motors. When broken rotor bar occurs, the rotor resistance will increase. Furthermore, thermal effects of rotor resistance are considered to address practical aspects. Therefore, a suitable method to detect broken rotor bar is rotor resistance estimation. An applicable method in state estimation is Cubature Kalman Filter...
Sensorless control is a promising alternative for controlling Electric Vehicle (EV) and Hybrid Electric Vehicle (HEV) propulsion systems without the need of complex devices, such as resolvers or encoders. As the usage of a physical sensor is avoided, this allows significant cost reductions of the drive, and the reliability of the system is also improved. EVs require an operation range from standstill...
In this paper, a novel model reference adaptive (MRA) based speed and rotor position estimation strategy is proposed for the surface mounted permanent magnet synchronous motor (SPMSM). In the proposed strategy, a new adaptive law is proposed by considering the MRA adaptive law as a controller. Furthermore a parameter self-turning strategy and a speed compensation strategy are proposed to improve the...
Nonintrusive efficiency evaluation method based on the air gap torque and rotor slot frequency is generally used in industry application. However, this method has the following problems: 1) the number of rotor slots should be given in advance; 2) with some special number of pole pairs and rotor slots, the stator and rotor slot harmonics may be aliasing, which may lead to great errors in identification...
Multiphase induction machines (MIMs) are attractive for safety-critical applications, because they are able to operate under open-phase fault. On the other hand, algorithms for sensorless speed estimation improve reliability and decrease cost and maintenance. The approach based on rotor slot harmonics (RSHs) is especially popular, due to advantages such as its independence from time-varying parameters...
Control of permanent magnet synchronous machines (PMSMs) requires rotor position measurement/estimation, as well as the magnet polarity detection for startup of the machine. The rotor position of PMSMs is typically measured using a speed/position sensor (e.g. an encoder), while the magnet polarity is commonly measured using digital hall-effect sensors. Since simplifying the system can help improve...
Efficiency of induction machines can be determined using international efficiency test standards such as the IEEE standard 112, IEC 60034-2-1 and JEC 37. The methods presented in these standards involve tests such as the no-load test, lock rotor test and a dynamometer test. Performing the no-load test is simple with fewer requirements in terms of equipment. The dynamometer test and the locked rotor...
This paper deals with the self-commissioning of synchronous reluctance motors. Previous work has demonstrated that the motor flux maps can be accurately identified at standstill by exciting the machine with square-wave voltage pulses of large amplitude, of the same order of the machine nominal voltage. This was made without the need of rotor locking and without using position sensors. The knowledge...
This paper proposes a novel rotor angular position estimation method based on self-inductance rectangle for doubly salient electro-magnetic motor (DSEM). It starts with injecting three test voltage pulses A+C-, B+A- and C+B-with the same width in order. At the end of each test pulse, the response currents iac, iba and icb are sampled and detected to identify the two-phase series inductances Lac, L...
This paper presents a method of position and speed estimation technique for a four-phase switched reluctance machine with novel bridge converter. The phase inductance is measured by high frequency voltage injection in an idle phase which is opposite to energized phase and the inductance variation is maximum. The two order Fourier series is used to match the phase inductance with rotor position. The...
This paper investigates two methods of self-sensing rotor position estimation based on signal injection for a homopolar synchronous motor. The magnetic anisotropy of the machine can be utilized for rotor position estimation, which can exclude a position encoder from the system in order to increase reliability of the drive. The stator response observer was tested and the field response observer was...
For interior permanent magnet synchronous motor (IPMSM) drives, high-frequency (HF) rotating voltage signal injection method is widely employed to estimate the initial rotor position. However, conventional demodulation method based on current phase is complex and susceptible to filters and digital control delays, an amplitude demodulation algorithm is proposed in this paper. With the proposed method,...
This paper deals with the sensorless direct torque control (DTC) scheme for the permanent magnet synchronous motor (PMSM), where a new estimation algorithm is developed based on the polynomial chaos theory and the extended Kalman filter (EKF) for the sensorless obtaining of the rotor speed, stator flux and electromagnetic torque. The proposed estimator can effectively deal with parametric uncertainties...
Extension of share of renewable energy sources in energy mix is a big challenge for our community to increase energy security and fight against global warming by cutting emissions of GHG. The paper estimate wind turbines capacity that can be integrated in actual electrical system of Moldova without its reconfiguration. The study is based on analysis of power transformer stations operating on 110kV,...
A full cycle pulse current peak envelope sensorless technique is presented in the paper, using the pulse injected and the chopper control mode with fixed chopping falling time for the rotor position detected. The high frequency pulse injected in the non conducting region, the chopper control mode in the conducting region, the discrete peak values of the pulse current are detected, the full cycle pulse...
In this paper, the signal processing scheme of high frequency (HF) signal injected sensorless control scheme of Permanent Magnet Synchronous Motor (PMSM) at low speed is discussed. First, a new modulation strategy based on Short-time Fourier Transform (STFT) and a special apart reference frame is presented, which is capable of processing signal effectively and estimating the position and speed of...
This paper studies the possibility of removing the position sensor from electric vehicles (EVs) powertrains that employ the externally-excited synchronous machine (EESM) for traction. Three position estimation approaches are studied: back-electromotive-force integration, state-observer and high-frequency voltage injection approaches. Theoretical background is presented, a comparative performance analysis...
In this work, a new predictive phase-locked loop (PLL) for encoderless control of a permanent-magnet synchronous generator (PMSG) in a variable-speed wind energy conversion system (WECS) is presented. The idea of the predictive PLL is derived from the direct-model predictive control (DMPC) principle. The predictive PLL uses a limited (discretized) number of rotor-angles for predicting/estimating the...
In this paper a systematic model based approach to state estimation for Permanent Magnet Synchronous Motor (PMSM) to built up sensorless drives is presented. A moving horizon estimation (MHE) algorithm is used, an optimization based scheme that yields excellent performance. Under mild assumptions, an optimal problem of type Equality Constrained Quadratic Programming (EQP) is resolved at each iteration...
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