Direct Torque Control of Four-Switch Brushless DC Motor With Non-Sinusoidal Back EMF

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Date

2010

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Ieee-inst Electrical Electronics Engineers inc

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Abstract

This paper presents a direct torque control (DTC) technique for brushless dc (BLDC) motors with non-sinusoidal back electromotive force (EMF) using a four-switch inverter in the constant torque region. This approach introduces a two-phase conduction mode as opposed to the conventional three-phase DTC drives. Unlike conventional six-step current and voltage control schemes, by properly selecting the inverter voltage space vectors from a simple look-up table at a predefined sampling time, the desired quasi-square wave current is obtained. Therefore, a much faster torque response is achieved compared to conventional current and voltage control schemes. In addition, for effective torque control, a novel switching pattern incorporating the voltage vector look-up table is designed and implemented for a four-switch inverter to produce the desired torque characteristics. Furthermore, to eliminate the low-frequency torque oscillations, pre-stored back EMF constant versus position look-up tables are designed and used in the torque estimation. As a result, it is possible to achieve two-phase conduction DTC of a BLDC motor drive with faster torque response due to the fact that the voltage space vectors are directly controlled. A theoretical concept is developed and the validity and effectiveness of the proposed DTC scheme are verified through the simulations and experimental results.

Description

Ozturk, Salih B/0000-0001-8322-4066

Keywords

Brushless dc motor drives, direct torque control, fast torque response, four switch inverter, low-frequency torque ripples, non-sinusoidal back EMF, two-phase conduction

Turkish CoHE Thesis Center URL

Citation

80

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Q1

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Q1

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Volume

25

Issue

2

Start Page

263

End Page

271