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This paper presents the improvement of a low cost saliency-based sensorless drive with a single dc-link current sensor for interior permanent-magnet synchronous machines. The phase currents, reconstructed by the single dc-link current sensor, usually suffer from a significant reconstruction error. This paper analyzes this reconstruction error, especially when applying sensorless drive technique based...
This paper presents a new algorithm for electromagnetic torque and flux estimation in a sensorless drive when uncompensated dc offset of current and/or voltage sensors are present. The novel feature of the offset error correction algorithm is an attempt not to eliminate the consequence of problem but to identify its source. The algorithm uses the first harmonic of estimated torque and dc value of...
This paper presents a novel sensorless control architecture, which is dedicated for mixed-mode IC implementation, for many low-cost applications of brushless DC (BLDC) motors over wide speed ranges. In order to measure the back-EMFs over a whole PWM switching cycle from low to full duty ratio, a hybrid back-EMF zero-crossing detection circuit is presented to sense and compare the back-EMFs without...
In this paper the influence of the non-ideal behavior of power electronics, sensors, and signal processing on pulse signal injection based speed sensorless control is addressed and investigated. The speed sensorless control signals are obtained from the transient current response resulting from an excitation of the machine with voltage pulses. The investigation is focused on sensorless control of...
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