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Modular multilevel converters with storage devices integrated in the submodules are emerging topologies for traction drives. This paper proposes a new state-of-charge control technique to optimally utilise supercapacitor cells that are connected to the sub-module capacitors by means of boost DC/DC converters. The proposed strategy ensures that the charging/discharging trajectory of all the supercapacitor...
This paper proposes an improved signal-injection-based stator-winding thermal-monitoring method for field-oriented-controlled (FOC) induction motors. In this method, stator-winding DC resistance is normally used as a direct indicator of winding temperature, and is obtained from injected DC currents and voltages in the motor winding. Conventionally, however, implementation of this DC-injection method...
This paper presents a bridgeless-single ended primary inductance converter (BL-SEPIC) fed brushless DC (BLDC) motor drive for low power household applications. The speed of the BLDC motor is controlled by adjusting the DC link voltage of the VSI feeding a BLDC motor. The VSI feeding BLDC motor is used for achieving an electronic commutation of the BLDC motor and operates in a low frequency switching...
A boost-buck (BB) DC-DC converter is proposed for solar photovoltaic (SPV) array fed water pumping system using a permanent magnet brushless DC (BLDC) motor drive. To design a BB converter with suitable voltage control, DC-DC boost and buck converters are cascaded such that it accomplishes the purpose of maximum power point tracking (MPPT) and soft starting of the BLDC motor. The BB converter exhibits...
In industrial applications where both DC (direct current) and AC (alternating current) adjustable speed drives (ASD) are used, high levels of harmonic voltage and current distortions are produced. For instance, in oil and gas industry, including land and offshore drilling rigs, ships, deep notches in the voltage waveform exist due to SCR's (silicon controlled rectifier or thyristor) operation in the...
The application of reduced common mode voltage pulse width modulation methods bring much high order harmonics to the variable speed drive system, which causes considerable iron loss inside the electric motor. In this paper, an improved iron loss model considering those high order harmonics is proposed. Iron loss coefficients are obtained based on experimental data by utilizing multiple linear regression...
This paper proposes a new design for a spoke-type BLDC motor using a ferrite permanent magnet (Fe-PM) to improve the reliability of the motor. First, the design process for a neodymium permanent magnet free spoke-type BLDC motor without an inserted additional assistant permanent magnet (PM) is presented. The proposed motor is designed by taking into account the demagnetization phenomenon. Second,...
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