The Brushless DC (BLDC) motor is a simple robust machine which has found application over a wide power and speed of ranges in different shapes and geometry. This paper briefly reviews the fundamentals behind the motor and also the different types of BLDC motors with different geometries and then presents a new configuration for BLDC motor/generator, which does not use a permanent magnet in the ...

Ramp-signal generators are particularly critical in controlling the frequency and dutycycle of pulse-width modulated (PWM) switching supplies. They are normally implemented with a timed charging current source into a capacitor and a reset switch controlled by two comparators whose reference signals set the lower and upper limits of the ramp. A fast comparator is required to ensure the reset ope...

This paper proposes an excitation system and voltage control for a Squirrel Cage Induction Generator in an independent wind energy conversion system. Energy is considered to be very promising alternative for power generation because of its tremendous environment, social, and economic benefits. Of all wind power technologies, the variable speed systems employing the Squirrel Cage Induction Gener...

This paper summarizes recent research at the author’s laboratory into power management circuitry, including: (1) Envelope-tracking power supplies for base station power amplifiers, (2) Digital PWM generator circuitry, (3) Spreadspectrum clocking for EMI reduction in digitally-controlled power supplies, (4) High-efficiency coupled-inductor DC-DC converters with fast response and low ripple, and ...

The purpose of this paper is to establish a robust and low-cost structure for a generator connected to an isolated load for wind applications. In a hybrid excitation synchronous generator (HESG), the excitation flux is created by both permanent magnets and excitation coils, so the output voltage can be controlled by the DC excitation field. For isolated loads, it is then possible to use a simpl...

Hybrid AC/DC microgrids facilitate the procedure of DC power connection into the conventional AC power system by developing the distributed generations (DGs) technologies. The conversion processes between AC and DC electrical powers are more convenient by hybrid systems. In this paper, an energy management system (EMS) for a hybrid microgrid network is proposed due to the optimal utilization of...

Received Sep 15, 2017 Revised Nov 14, 2017 Accepted Nov 23, 2017 In this paper, a straightforward strategy for tracking the maximum power (MP) accessible in the wind energy conversion system for dc microgrid is proposed. A three-phase diode bridge rectifier alongside a dc-dc converter has been utilized between the terminals of wind-driven induction generator and dc microgrid. Induction generato...

Received Sep 15, 2017 Revised Nov 14, 2017 Accepted Nov 23, 2017 In this paper, a straightforward strategy for tracking the maximum power (MP) accessible in the wind energy conversion system for dc microgrid is proposed. A three-phase diode bridge rectifier alongside a dc-dc converter has been utilized between the terminals of wind-driven induction generator and dc microgrid. Induction generato...