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This paper proposes a novel technique to estimate online the inductances of a Permanent Magnet Synchronous Machine (PMSM) based on the measurement of the current derivatives excited by two active-voltage vectors and one zero-voltage vector within a PWM cycle. The d- and q-axes inductances of PMSMs are calculated during normal operation of the drive system. The influence of the magnetic saturation...
This paper proposes Fuzzy Logic Controller scheme in sensorless (PMSM) drives based on fundamental excitation. Fuzzy Logic Control (FLC) is suitable for a controller design when the system is difficult to model mathematically due its complexity, nonlinearity and imprecision. Especially for sensorless drives of PMSM which uses the complex estimator's equations and adaptation mechanism. Fuzzy Logic...
An Extended Kaiman filter(EKF) based speed and position observer for a PMSM in low and medium speeds is presented in this paper. The estimator is used to control an IPMSM of 1.5 kW, 3000 rpm rating. EKF algorithm is implemented in the stationary αβ reference frame model for PMSM. Design considerations for the Extended Kaiman Filter are presented, followed by simulation and experimental results for...
In this paper, a novel sensorless control strategy with the injection of a high-frequency pulsating carrier signal into a stationary reference frame is proposed. Differing from the two most commonly used conventional high-frequency carrier signal injection methods, i.e., the injection of a rotating carrier voltage into a stationary reference frame and the injection of a pulsating carrier voltage into...
In more electric vehicles, to reduce cost, volume and weight, a Hall effect position sensor may be used instead of a resolver as the mechanical sensor to allow vector control of a Permanent Magnet Synchronous Machine (PMSM) with a sinusoidal back-EMF. As this kind of sensor provides only six measurements per electrical turn, the position error between the actual rotor position and the measured position...
This paper presents calculations and measurements for a permanent magnet synchronous machine (PMSM) with buried magnets. Due to wide field weakening capability and high utilisation of this external rotor machine, it can be especially used for traction applications. The steady-state torque is about 346 Nm and overload torque at three times nominal current is about 580 Nm. Fractional-slot concentrated...
Three-level inverters and relative techniques have been concerned more and more in industrial drive applications because of the outstanding performance. The aim of this paper is to present a strategy for the sensorless vector control of Permanent Magnet Synchronous Motor (PMSM) drive fed with a three-level Neutral-Point-Clamped (NPC) inverter. By measuring the different current change rates which...
This paper investigates the nonlinear model of the permanent magnet synchronous machines (PMSMs). In order to incorporate the structural and saturation saliencies, two parameters are defined to indicate the saturation ratios. An analytical model is derived and the inductance matrix is expressed in both stationary and rotating reference frames, respectively. An incremental inductance measure system...
This paper describes a speed sensorless permanent magnet synchronous motor (PMSM) direct torque control (DTC) using single DC-link voltage and current sensors. The phase currents are estimated in a two-stage process: prediction and adjustment. Prediction is based on the dynamic motor model, whereas adjustment relies on the inverter switches states and the measured DC-link current. This system is then...
To reduce control systempsilas cost and complexity of permanent magnet synchronous motors (PMSM), mechanical sensorless control is becoming a research focus. This paper presents a novel high frequency (HF) signal injection method for the mechanical sensorless control of surface mounted permanent magnet synchronous motors (SPMSM) in low speed and even zero speed regions based on the little saturation...
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