NDLI: Simple overlap angle control strategy for commutation torque ripple minimisation in BLDC motor drive

Content Provider	IET Digital Library
Author	Lad, Chetan K. Chudamani, Rajagopalan
Abstract	In this paper, a novel overlap angle controlled Direct Torque Control (DTC) scheme is proposed which strikes the balance between commutation torque ripple and losses. The commutation torque ripple in a Brushless DC (BLDC) motor is mainly due to the effect of commutation on non-commutating phase current and it will be more severe in high power applications. DCT techniques are used to reduce the torque ripple. In comparison to the conventional two-phase conduction Six-Step DTC (SSDTC), the commutation torque ripple is considerably reduced by Twelve-Step DTC (TSDTC) but at the cost of increased inverter and winding losses. The proposed method offers commutation torque ripple minimisation and loss optimization simultaneously by controlling the motor operation in hybrid two- and three-phase conduction. The proposed method basically leads to motor operation in three phase conduction during overlap region and in two phase conduction during non-overlap region. The overlap and non-overlap regions are identified by calculating the commutation interval and suitably scaling it by a factor K ov . The proposed method is validated through experimental results and the effect on commutation torque ripple and drive efficiency are compared with SSDTC and TSDTC experimentally.
Starting Page	797
Ending Page	807
Page Count	11
ISSN	17518660
Volume Number	12
e-ISSN	17518679
Issue Number	Issue 6, Jul (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-epa/12/6
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-epa.2017.0644
Journal	IET Electric Power Applications
Publisher Date	2018-02-16
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	12-Step DTC BLDC Motor Drive Brushless DC Motor Brushless DC Motor Drive Commutation Interval Commutation Torque Ripple Effect Commutation Torque Ripple Minimisation Control of Electric Power System D.C. Machines DC Motor Drive Drive Drive Efficiency DTC Scheme Electromagnetic Torque Pulsation Hybrid Two-phase Conduction Inverter Invertors Loss Optimisation Machine Control Machine Windings Mechanical Variables Control Minimisation Noncommutating Phase Current Noncommutation Interval Optimisation Technique Overlap Angle Controlled Direct Torque Control Scheme SSDTC Three-phase Conduction Torque Control Two-phase Conduction Six-step DTC Voltage Space Vector Winding Loss
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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