Abstract
This paper investigates the sensorless control of a general Five-phase permanent magnet brushless DC (5Φ-BLDC) motor working at the low speeds. High frequency (HF) injection-based sensorless control is most popular, however, the system delay and stator resistance could deteriorate the sensorless control performance. In this paper, an HF model of 5Φ BLDCs at frequency-domain is primarily established as a replacement over the conventional static model, and an interpretation from the sinusoidal internal model is carried out to direct the sensorless control implementation. Accordingly, the measured d-axis HF current, which is typically neglected in the conventional method, is reused to demodulate the position angular information from the measured q-axis HF current. The proposed sensorless control is performed on a 5Φ BLDC drive, and experimental results confirm the effectiveness of this method while comparing its performance with the conventional method.
Highlights
Due to its high-power density and high reliability as well as the excellent fault-tolerant capacities, the multi-phase machine has attracted tremendous attention in recent years and has been replacing three-phase (3 ) motor drive in many applications [1], [2]
The sensorless control performance can be improved by lowering the injection frequency and using a novel position demodulation method basing on Lock-in Amplifier (LIA)
The remainder of this paper is organized as follows: sector II highlights the challenge in performing the sensorless control of a 5 BLDC drive; sector III develops a comprehensive High frequency (HF) motor model incorporating several factors that are somehow neglected in the previous literature; in sector IV details the novelties of this paper which are, respectively, system delay offsetting and injection frequency optimization; in sector V comparative experiments with the classical method are conducted; and lastly sector VI concludes the contribution of this paper
Summary
Due to its high-power density and high reliability as well as the excellent fault-tolerant capacities, the multi-phase machine has attracted tremendous attention in recent years and has been replacing three-phase (3 ) motor drive in many applications [1], [2]. The sensorless control performance can be improved by lowering the injection frequency and using a novel position demodulation method basing on Lock-in Amplifier (LIA) To be specific, both the reference and modulated signals are taken from the measured currents, and thanks to this, the influence of system delay and stator resistance are possible to be mitigated. The remainder of this paper is organized as follows: sector II highlights the challenge in performing the sensorless control of a 5 BLDC drive; sector III develops a comprehensive HF motor model incorporating several factors that are somehow neglected in the previous literature; in sector IV details the novelties of this paper which are, respectively, system delay offsetting and injection frequency optimization; in sector V comparative experiments with the classical method are conducted; and lastly sector VI concludes the contribution of this paper. The time delay compensation, which is deemed quantifiable, is suggested in some literature, this is still not accurate enough
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