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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...
This paper deals with the control strategy for synchronous homopolar machine adapted for traction applications. Advantages and disadvantages of homopolar motors are first discussed. Mathematical models and variations of its design are given. The structure of the proposed control strategy is based on field oriented control but it was modified in order to achieve maximum performance according to experimentally...
This material is a general review of the current situation with hybrid vehicles in Russian Federation, based on the dynamics and economy of hybrid cars, and on their possible benefits and advantages in future.
This paper presents a method of GPS-track data processing and analysis which is aimed at obtaining the tangential and normal acceleration and the elevation angle data of a vehicle driving over its entire route with respect to time. The method comprises an algorithm which eliminates the position reading errors of the GPS system and improves the accuracy of the results. The data produced by this proposed...
This paper considers the problem of self-sensing control capability for synchronous homopolar machine. The advantages and disadvantages of the homopolar motor for traction application are discussed. The magnetic anisotropy of this machine allows to implement encoderless control systems which operates in the whole speed range. This feature is very important for traction applications to reduce the cost...
This paper discusses a simple and efficient method of determining the maximum performance torque-speed characteristic for an induction motor drive. The proposed method considers the voltage and current constraints of the inverter supply for the drive. The mathematical description of the motor in DQ reference frames was adapted to build a model applicable for numeric calculation. It has been shown...
This paper proposes a high-performance speed measurement method for electric drives using incremental encoders. The proposed solution improves the period-based speed estimation method. Such methods suffer from low resolution of time measurement at high speeds. The proposed method solves this problem by processing every speed estimation between the consecutive execution of the speed controller predicting...
This paper deals with the derivation of commutation angles for maximum torque for switched reluctance motors operated over their entire speed range. A linearised model of the motor was used for this purpose, and the definition of the rated speed was derived. It is shown that the switched reluctance motor provides constant power in the field-weakening mode in case of continuous current operation. Then,...
The further penetration of renewable sources in the grid requires the implementation of energy storages in order to smooth out the variability and intermittent nature of renewables. This paper looks at the possibilities for a storage solution to meet an unprecedented situation of having no power input from renewables or an outage from grid sources for five consecutive days in the highest demand period...
This paper deals with the method of elimination of the DC offset impact on the speed estimation system which uses sine/cosine incremental position encoder. The impact of the DC offset in the input signals to the PLL-based speed estimation is shown. The problem can be solved by means of the highpass filter which should be implemented in the angle domain instead of time domain. The simulation and experimental...
This paper discusses an adaptive algorithm to control a magnetorheological fluid vibration isolator operating under varying frequency of the vibration source. The algorithm provides automatic tuning of the isolator properties by controlling the viscosity of magnetorheological fluid in the throttle channels. This ensures efficient damping and vibration protection at the main harmonic of a varying vibrational...
This paper describes the development of an undergraduate and a post graduate course on Small Unmanned Aircraft (SUA). Few emerging technologies provide the potential for such a diverse application of knowledge as SUA which are more commonly referred to as “Drones”. They are being used for civil purposes in a growth business sector predicted to be worth billions of pounds over the next 10 years. They...
The study discusses the design principles of instructional laboratory equipment applied for practical investigations of electric drive control. The laboratory workstations comprise of two-motor hardware systems where each motor is controlled by a real-time DSP board. A control structure under test is assembled at the software level using a number of control elements, which is then compiled into a...
The purpose of this paper is to test the algorithm of PWM with inverter non-idealities compensation and switching losses minimization on a model with various power directions and power factor. The PWM strategy implements simultaneous switching losses minimization and dead-time and voltage drop compensation. The operation of the algorithm is considered. Collisions between switching losses minimization...
This paper deals with the solution of the insulation monitoring system for the frequency controlled electric drives in TN networks. The insulation monitoring system is active during standstill of the drive. Inverter executes a special test switching pattern and the leakage current is obtained from the signal of the current transformer, which measures the current in all three phases of the drive simultaneously...
This paper discusses the implementation of a real-time model of a switched reluctance motor drive for which the parameters of its magnetisation curve are represented by the data in a look-up table. A method of cubic interpolation has been applied for the look-up table approximation in order to provide a high accuracy and realistic performance of the modelled motor drive. The model structure has been...
This paper proposes the combined use of DPWM strategy to reduce switching losses with inverter non-idealities compensation algorithm. While both methods have been widely studied separately, the combined use poses some restrictions which should be considered. In this paper the priority is given to precise voltage realization and the switching losses optimization is implemented if possible. The proposed...
This paper proposes speed estimation method for the incremental position encoders. This method uses variable angular path to keep the bandwidth and accuracy in the specified range regardless of the current speed. This paper also describes existing speed estimation methods, their strong and weak points. Moreover, non-idealities of the incremental encoders are discussed and compensation algorithm is...
This article analyzes the effect of the modulation strategy on the thermal behavior of the power devices in AC drives. Excessive temperatures in the Silicon can be prevented by adequate selection of the switching frequency and modulation method. Continuous and discontinuous modulation methods will be considered. The impact of the modulation strategy and switching frequency on the total harmonic distortion...
The wide range of modern industrial applications demand on extremely high performance of motion control systems in terms of tracking accuracy and therefore control bandwidth. The paper presents a novel dynamic model feedforward quasi-continuous servo drive control approach with regular current feedback sampling implemented on FPGA. Compared to the conventional DSP-based systems the current and the...
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