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The distributed regenerative drive system (DRDS) proposed in this paper is based on the three-phase grid quasi sinusoidal power converter and a common distributed dc-link as a power supply for the vector controlled three-phase power inverter and for the bidirectional dc-dc power converter. The braking energy of both three phase induction motor and dc motor are regenerated in the grid at unity power...
The speed and position estimation from Back EMF has been a problem under speed reversal response due to change of sign of speed. In this paper, an algorithm using fuzzy logic is proposed to estimate the speed and position of BLDC motor from back EMF for sensorless brushless DC (BLDC) motor drives to improve the performance of conventional sensorless drives. Most existing sensorless methods of the...
The paper presents a complete mathematical analysis of a BLDC motor commutation which results in the motor static characteristics torque-speed and efficiency-speed. The motor, having a sinusoidal back emf, is supplied from a DC source via a 6-leg inverter using the 120degON operation. The formulas for the phase currents and voltages are derived. The first harmonic of the phase voltage is determined,...
This paper will present a test bench to verify the reliability of new prototypes of inverter for electric motor in the hybrid vehicle. These inverters must be tested in the same conditions as in real vehicle. A 22 kW induction motor has been used, coupled with a DC motor in order to impose the load torque. We have implemented various mission profiles ( European ARTEMIS cycles) of load torque on the...
This paper describes the reduction in torque ripple due to phase commutation of brushless dc motors. With two-phase 120deg electrical conduction for the inverter connected to the conventional three-phase BLDC machine, the commutation torque ripple occurs at every 60 electrical degrees when a change over from one phase to another occurs. This effect increases the commutation time at higher speeds which...
The paper presents a complete mathematical analysis of a sinusoidal BLDC motor commutation. The motor is supplied from a DC source via a 6-leg inverter using the 120degON operation. The commutation period of 60 electrical degrees is divided into two sub-periods, for which the corresponding differential equations are solved using the initial and final conditions. The obtained model is simple to apply;...
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