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To improve the accuracy of stator flux estimator in Direct Torque Control (DTC) of Interior Permanent-Magnet Synchronous Machine (IPMSM), a pulse response based rotor position estimator is proposed. The current ripples caused by active voltage vectors in DTC are utilized by the rotor position estimator. Then, the estimated rotor position serves as an input for a model-based stator flux estimator in...
This paper presents a load torque estimation method for self-sensing brushless DC drives. Torque ripples in brushless DC machines can be reduced using load torque information. This method uses the terminal voltage, the virtual neutral point voltage and the DC-bus current of the machine. The algorithm uses the variation of successive back-emf samples to estimate the rotor speed. The rotor position...
This paper discusses an enhancement for salient-pole brushless dc-drives using a single current sensor in the dc-bus. The improvement is made by replacing the hall sensors with a rotor-position estimator, increasing the reliability of the drive and reducing its cost. As a result, the BLDC-drive is controlled by using a single sensor only, requiring a minimum amount of electronics to process the measurements...
At low speed, the rotor-position estimation in sensorless control is often carried out based on the evaluation of the phase-current ripples resulting from the supply of high-frequency voltage test signals. However, the rotor-position estimation is affected by cross-saturation in the machine, resulting in less accurate position estimations at higher loads. As the importance of sensorless control of...
This paper deals with the seamless integration of high-frequency test voltages for IPMSM rotor-position estimation in the discrete-time current-controller with fixed sampling frequency of a voltage-source converter. Pulsed test voltages are used that don't interfere with the current samples taken to control the phase currents. For this purpose, an asymmetric pulse-width modulator is applied. As a...
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