Sensorless commutation of printed circuit brushless direct current motors

Ahfock, A.; Gambetta, D.

doi:10.1049/iet-epa.2009.0133

Cited by 13 publications

(2 citation statements)

References 6 publications

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“…Moreover, concerning the design aspects, the cogging torque ripples are reduced by modifying the magnetic circuit of the machines using various methods such as feedback linearization algorithms, using T-shaped bifurcations teeth in stator slots, closing the slots using a sliding separator, using notches in the rotor of low power motors, concentrating coil winding in the same phase group, reducing claw pole size, magnet step skewing method and U-shaped magnetic poles. These ideologies were performed conventionally to control the torque ripple of the BLDC motor through designing [23][24]. Every ideology discussed has its disadvantages such as (i) Using modified magnetic circuit reduces torque ripple but results in the increase of additional harmonics, (ii) using T shaped bifurcation teeth in stator slot reduces the mechanical strength of BLDC machines, (iii) introducing notches in the rotor is too difficult, (iv) sliding separators can't be used in low power machines, (v) concentrating coil winding of the same phase is too difficult, (vi) using magnetic step skewing methodology increases structural complexity of the BLDC machine [25].…”

Section: B Literature Survey and Backgroundmentioning

confidence: 99%

A Review of BLDC Motor: State of Art, Advanced Control Techniques, and Applications

et al. 2022

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Brushless direct current (BLDC) motors are mostly preferred for dynamic applications such as automotive industries, pumping industries, and rolling industries. It is predicted that by 2030, BLDC motors will become mainstream of power transmission in industries replacing traditional induction motors. Though the BLDC motors are gaining interest in industrial and commercial applications, the future of BLDC motors faces indispensable concerns and open research challenges. Considering the case of reliability and durability, the BLDC motor fails to yield improved fault tolerance capability, reduced electromagnetic interference, reduced acoustic noise, reduced flux ripple, and reduced torque ripple. To address these issues, closed-loop vector control is a promising methodology for BLDC motors. In the literature survey of the past five years, limited surveys were conducted on BLDC motor controllers and designing. Moreover, vital problems such as comparison between existing vector control schemes, fault tolerance control improvement, reduction in electromagnetic interference in BLDC motor controller, and other issues are not addressed. This encourages the author in conducting this survey of addressing the critical challenges of BLDC motors. Furthermore, comprehensive study on various advanced controls of BLDC motors such as fault tolerance control, Electromagnetic interference reduction, field orientation control (FOC), direct torque control (DTC), current shaping, input voltage control, intelligent control, drive-inverter topology, and its principle of operation in reducing torque ripples are discussed in detail. This paper also discusses BLDC motor history, types of BLDC motor, BLDC motor structure, Mathematical modeling of BLDC and BLDC motor standards for various applications.INDEX TERMS BLDC motor, torque ripple, current shaping techniques, controlling input voltage, direct torque control, drive-inverter topology, field orientation control, motor design, fault tolerance control and electromagnetic interference reduction.

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Section: B Literature Survey and Backgroundmentioning

confidence: 99%

A Review of BLDC Motor: State of Art, Advanced Control Techniques, and Applications

et al. 2022

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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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