Vector analysis of the current commutation in PM BLDC drives

Buja, Giuseppe; Menis, R.; Keshri, Ritesh Kumar

doi:10.2478/bpasts-2013-0089

Cited by 6 publications

(7 citation statements)

References 15 publications

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“…As described in [15], FCS-MPC in the natural reference frame (a-b-c frame) is being used for PM BLDC motor for commutation torque ripple reduction. Stationary frame representation [18] of PM BLDC motor helps to get a predictive model in the stationary plane. The block diagram of FCS-MPC for PM BLDC motor is shown in Fig.…”

Section: A Finite Control-set Model Predictive Control (Fcs-mpc)mentioning

confidence: 99%

“…Model predictive control is applied for PM BLDC motor in a-b-c reference frame in some cases for reduction of commutation torque ripple [15], for improved dynamic behavior [16] and for position control [17]. With the emergence of stationary frame analysis for PM BLDC motor [18], analysis for the control method gets easier. New control techniques applied to PM BLDC motor are in the stationary frame.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Predictive Current Control Techniques for PM BLDC Motor in Stationary Plane

Trivedi

Keshri

2020

IEEE Access

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In general, PM BLDC motors are injected with square wave phase currents through PI-PWM control in a-b-c reference plane to ensure maximum torque-per-ampere. The operation of PM BLDC motor in a stationary plane has shown considerable simplification in design, and analysis in the control techniques. The present paper considers the injection of square wave phase current through predictive current control strategies in the stationary plane. For the evaluation of performance, cases of deadbeat predictive control, hysteresis based predictive control, and finite control-set model predictive control (FCS-MPC) methods are considered. Control schemes have been designed for 48V, 660W PM BLDC motor. Comparative evaluation is carried out in terms of the harmonic components available in the current and torque, tracking of the current trajectory in the stationary plane in the low and high-speed region, and execution time of all the control methods. Considered predictive methods are tested on an experimental prototype, and control is implemented through digital Signal Processor (DSP) TMS320F28335. Evaluation leads to the conclusion that predictive control performs better than PI-PWM for reducing commutation torque ripple, keeping current harmonics under control. It is observed that predictive control strategies in the stationary plane, improve the torque-speed characteristic to the wider utilization of constant torque zone of operation as compared to conventional strategies.

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Section: A Finite Control-set Model Predictive Control (Fcs-mpc)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of Predictive Current Control Techniques for PM BLDC Motor in Stationary Plane

Trivedi

Keshri

2020

IEEE Access

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“…In a-b-c reference frame, current in commutating and noncommutating mode plays a role in control while when observed in stationary frame in sector S 1 the current vector in commutation period transits from one vector to another vector (e.g., I 6 to I 1 ) and during noncommutation period it stays at a particular vector location (e.g., I 1 ) as shown in Figure 5. The current vector trajectory for low speed (case i), for ideal mode (case ii), and for high speed (case iii) is as shown in Figure 6 [19]. Figure 6.…”

Section: Stationary Reference Framementioning

confidence: 99%

“…In [17,18], DTC is used for PM BLDC motor in the stationary reference frame in which flux trajectory and two phases and three phases switching mode are described with experimental validation. Detailed analysis of stationary reference frame applied to PM BLDC motor with experimental validation is shown in [19]. In [20], for nonideal back-EMF by applying the stationary frame of reference, the reference current is generated and injected with suitable harmonics for torque-ripple-free operation in PM BLDC motor.…”

Section: Introductionmentioning

confidence: 99%

Comparative evaluation of a-b-c and stationary frame of reference for permanentmagnet brushless DC motor drive applied for generation of switching pattern

Trivedi¹,

Keshri²

2019

Turk J Elec Eng & Comp Sci

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This paper focuses on the evaluation of the operation of permanent magnet brushless DC (PM BLDC) motor through the control implemented in the natural reference frame (a-b-c frame) and the stationary reference frame (α − β frame). To a large extent, ripple-free torque and attainment of higher torque-speed characteristic depend on the gating pulses/switching patterns of the inverter employed. PM BLDC motor requires injection of the square wave current for the maximum torque per ampere, so the reference is required to be generated and tracked accordingly. The effectiveness of the strategies of pulse-width-modulation-based current control in the a-b-c plane and, the case of singlevoltage-vector model predictive control and proposed two-voltage-vector model predictive control in the stationary plane have been evaluated. The parameter for comparison is based on improved tracking performance of the reference, ease in analysis of the control technique and less complexity in implementation of the control. The analysis has been verified through experimentation, with the control implemented through C2000 TMS320F28335 microcontroller commenting on the advantages of the stationary-plane-based approach.

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“…Space vector modulation (SVM) is successfully used as AC drives power supplies [4][5][6][7][8][9][10][11][12][13][14][15]. It allows to reduce current ripples against sinusoidal pulse width modulation (PWM), however, the problem still requires a solution for high-quality drives with wide range of speed control.…”

Section: Introductionmentioning

confidence: 99%

The effect of space vector modulation algorithm on characteristics of three-phase voltage inverter for drives of optical telescopes

Tomasov¹,

Усольцев²,

Zolov³

et al. 2017

Bulletin of the Polish Academy of Sciences Technical Sciences

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Abstract. The effect of space vector modulation algorithm on magnitude of current vector ripples was considered on the mathematical model of a three-level three-phase voltage inverter with symmetric active inductive load. Limitations on the use of such inverters as a power supply for precision drive of optical telescopes were specified.Key words: multilevel inverter, space vector modulation, modulation algorithm, current ripples, precision AC drive.The effect of space vector modulation algorithm on characteristics of three-phase voltage inverter for drives of optical telescopes V. TOMASOV * , A. USOLTSEV, P. ZOLOV, and P. GRIBANOV ITMO University, 49 Kronverksky Pr., St. Petersburg, 197101, Russia viding the modulation period into two or three equal time intervals, within which the base vectors bounding 60-degree sector containing the modulation voltage vector are formed [16][17][18]. Thus, the number of base "vectors" increases to 12 and 56, accordingly. But it significantly complicates the control system. Eventually, VSI of AC drive must form a circular hodograph of stator flux linkage, or, equivalently, of stator current, in steady state mode. The trajectory of stator current vector between adjacent commutations of inverter switches is determined by the attitude and magnitude of active voltage base vector. Therefore, different sequences or algorithms of base vectors formation within the modulation period lead to different trajectories of current vector and different ripples. The effect of the choice of sequence of base vectors forming on the current (flux linkage) ripples during transitions of modulation vector across the segment borders is considered in [19,20]. However, the kind and magnitude of ripples depends not only on voltage jumps at the boundaries, but also on the algorithm (sequence) of vectors forming within segments. Moreover, the number of algorithms excluding redundancy of base vectors for threephase VSI is six.This work covers the investigation of effect of modulation algorithm on current ripples in the load of the inverter. Threelevel inverter was selected as an object of study, as it most clearly demonstrates this effect in different operation modes. At the same time, the findings may be extended to inverters with more levels, as well as to two-level inverters. Moreover, during deep control, which is needed to achieve ultra low velocities of the drive, current formation operates on two or three-level mode, regardless of the total number of levels of VSI. At the same time, rotating EMF is close to zero, and motor becomes active inductive load for the inverter. Therefore, symmetric RL-circuit was used as the load. Base vectors plane of three-phase inverterAll possible states of three-phase inverter output voltage can be represented as vectors, ends of which are placed at the sides

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Vector analysis of the current commutation in PM BLDC drives

Cited by 6 publications

References 15 publications

Evaluation of Predictive Current Control Techniques for PM BLDC Motor in Stationary Plane

Evaluation of Predictive Current Control Techniques for PM BLDC Motor in Stationary Plane

Comparative evaluation of a-b-c and stationary frame of reference for permanentmagnet brushless DC motor drive applied for generation of switching pattern

The effect of space vector modulation algorithm on characteristics of three-phase voltage inverter for drives of optical telescopes

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