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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 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 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 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...
In this paper an adaptive rotor flux observer is developed. This observer performs a real-time correction of the mutual inductance and rotor resistance of the motor using data from the DC-link voltage sensor, the inverter state and the phase current and position sensors. The observer compares the behavior of two independent observers (sensorless and sensored observers) in order to correct the parameters...
This paper consider the utilization of the division operation in real-time motion control microcontroller systems. It is shown that the most typical case is calculation of the inverse DC-link voltage for the correction of the inverter control signals due to DC-link voltage deviations. The benchmark of the division operation shows that it takes approximately 30 or more CPU cycles to perform division...
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