New sensorless commutation technique for brushless DC motors

Gambetta, D.; Ahfock, A.

doi:10.1049/iet-epa:20070517

Cited by 24 publications

(12 citation statements)

References 8 publications

(6 reference statements)

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“…The sector of initial electrical rotor position can be estimated by using the combination of signs of L ab L ac and L bc (Fig.5), which is summarized in Table I, with two domains. An expression for the rotor position found in (15) was generated by using rotational coordinate transformation from the above expressions(14). …”

Section: B the Line Current Slope Difference Calculation Methodsmentioning

confidence: 99%

Initial position estimation of permanent magnet synchronous motors based on variation behavior of winding inductances

Meng

et al. 2015

2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia)

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An estimation method of initial rotor position is a difficult research branch in permanent magnet synchronous motors(PMSM), it is also an important research branch in sensorless technique. In PMSM with a saliency pole structured rotor, influenced by saliency effects, the self-inductance and mutualinductance present periodicity variation, Starting from this feature Firstly, the method of injecting high frequency low voltage pulses is utilized for identifying the line inductance and then the influence of winding current to line inductance are thorough analyzed by Fourier series decomposition. Secondly, using the rotational coordinate transformation, the fundamental harmonic and third harmonic can be eliminated to some extent, and then the inductance can be presented by a sine function, then the position vs. inductance characteristics are modeled for estimating the rotor position. The experimental results show that the proposed method estimates the initial rotor position reliably and efficiently.Index Terms-permanent magnet synchronous motor(PMSM) ; high frequency low voltage pulses; initial rotor position; the position vs. inductance model; rotational coordinate transformation;

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Section: B the Line Current Slope Difference Calculation Methodsmentioning

confidence: 99%

Initial position estimation of permanent magnet synchronous motors based on variation behavior of winding inductances

Meng

et al. 2015

2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia)

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“…The commutation EBEMF is 18.13 V when i f =5A,n = 1000 r/min, thus the mathematics expression of e * pf can be obtained by substituting the measured data into (4), as (9) shows…”

Section: Fitting Parameters Acquisition Testmentioning

confidence: 99%

“…Numerous sensorless control algorithms for BLDC have been reported over the past decades, and they are of great reference value for DSEM. The followings are mainly included: zero-crossing point detection of back electromotive force (BEMF), testing pulses injection, states observer and flux linkages based techniques [8][9][10][11][12]. All the aforementioned methods have their own advantages; however, BEMF-based method is the most widely used one especially at medium and high speeds [8].…”

Section: Introductionmentioning

confidence: 99%

Research on sensorless and advanced angle control strategies for doubly salient electro‐magnetic motor

Zhou

Zhang

Guo

et al. 2016

IET Electric Power Applications

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This paper proposes a sensorless method for doubly salient electromagnetic motor (DSEM). The commutation signals are obtained through the comparison between the voltage of silent phase and a pre-set threshold value based on the characteristic that the excitation back electromotive force (EBEMF) at commutation points is unaffected by the saturation of excitation field. Furthermore, in order to improve the torque output performance of DSEM, a novel sensorless advanced angle control (AAC) is investigated. Unlike traditional AAC, through piecewise linear fitting EBEMF in advance commutation interval, this method does not require the detection of standard commutation points. The experiments implemented on a 12/8-pole DSEM validate the proposed methods over a wide range of speed and load conditions in both steady and dynamic procedures.

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“…The estimation of commutation points based on speed independent, flux‐linkage function such as G ‐function [20] and G ′‐function [21] are investigated. The sensorless position estimation by equal inductance method and the applicability of the method for a category of motors (printed circuit PMBLdcM) is explored in [22, 23], where by detecting the equal phase inductance positions, upcoming commutation instants are determined. There is a 30° electrical rotational lead between the equal phase inductance positions and upcoming commutation instants.…”

Section: Introductionmentioning

confidence: 99%

Frequency‐independent rotor position signal generation scheme for a PMBLdc motor without position sensors

Achary¹,

Nagamani²,

Ilango³

2020

IET Electric Power Applications

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A simple scheme for generating rotor position signals in a Permanent Magnet Brushless dc Motor (PMBLdcM) without the need for Hall‐effect sensors is presented here. In the PMBLdcM, the difference between the terminal voltages reflects the phase back‐electromotive force whenever the particular phase is not energised. The line‐to‐line terminal voltage signals are processed twice to obtain the Position functions or P‐functions. The zero‐crossing instants of these signals correspond to the instants for energising the individual phases of the PMBLdcM irrespective of the speed. Typically, the position functions are trapezoidal in nature with the magnitude comparable to the applied terminal voltages. Thus, by suitably processing the position functions, the rotor position information similar to the conventional Hall signals can be generated. The proposed technique is simple, easy to implement, frequency‐independent, does not require the machine's neutral point and complex mathematical calculations. Moreover, since it involves the processing of real‐time signals, the method does not depend upon the accuracy of model parameters. Also, the scheme is effective even at low speeds since the magnitude of position functions is comparable to the applied terminal voltages. The proposed scheme is verified through simulations and experiments for a 1 hp PMBLdcM in the laboratory.

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New sensorless commutation technique for brushless DC motors

Abstract: In brushless DC (BLDC) drives commutation is performed by power electronic devices forming part of an inverter bridge. Switching of the power electronic devices has to be

Cited by 24 publications

References 8 publications

Initial position estimation of permanent magnet synchronous motors based on variation behavior of winding inductances

Initial position estimation of permanent magnet synchronous motors based on variation behavior of winding inductances

Research on sensorless and advanced angle control strategies for doubly salient electro‐magnetic motor

Frequency‐independent rotor position signal generation scheme for a PMBLdc motor without position sensors

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