Comparison of Direct Torque Control of BLDC Motor with ‎Minimum Torque Ripple in Four- and Six-Switch Inverters

H. Mirzaei; M. Alizadeh Pahlavani; P. Naderi

doi:10.15866/iree.v8i3.1857

Comparison of Direct Torque Control of BLDC Motor with ‎Minimum Torque Ripple in Four- and Six-Switch Inverters

H. Mirzaei^(1*), M. Alizadeh Pahlavani⁽²⁾, P. Naderi⁽³⁾

^(*) Corresponding author

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Abstract

The current study represents direct torque control (DTC) methods implemented in the four- and six-switch inverter for brushless dc (BLDC) motors with non-sinusoidal back-EMF using two-phase conduction modes. In this control method only two phases are being directed using a six-phase inverter at each time. By proper choice of inverter's spatial voltage vectors in two-phase conduction mode through a simple look-up table, the current with desired waveform is obtained. Thus, it is possible to obtain the DTC of a BLDC motor drive with a faster torque response. In this paper, a DTC method in BLDC motor using four-switch inverter in a constant torque region has also been studied. In order to effectively control the torque in a two-phase conduction mode, a new switching pattern which forms a new look-up table of voltage vector is designed and also used as a four-switch inverter to generate the desired torque profile. As a result, we are able to access two-phase conduction DTC of a BLDC motor drive using four- and six-switch inverter with a faster torque response. The direct torque control and simulation with non-sinusoidal back electromotive force are also extensively compared in this paper using three-phase conduction mode and four- and six-switch inverter
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Keywords

Direct Torque Control (DTC); BLDC Motor; Back Electromotive Force (BEMF)

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References

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