Design of Wound Rotor Synchronous Machines with Passive Rectifier
A new Magnetic Equivalent Circuit (MEC) model was developed to support automated multi-objective design of Wound-Rotor Synchronous Machines (WRSMs). In this paper the design and control of coupled synchronous machine/diode rectifier systems proposed. . First, WRSM design is carried out with the objective to minimize machine mass and loss. A map between current and torque is generated using a single-objective optimization in which core, resistive, and switch conduction loss are minimized. The applicability of the excitation to systems in which prime mover angular velocity varies and is (un)controllable is considered, as well as its impact on machine design. In this paper, a reluctance network has been derived to model flux distribution around damper bar openings. A state model with stator, field, and damper winding flux linkages are selected as state variables. The resulting coupled MEC/state model is solved with, skew of the rotor pole to obtain transient machine dynamics, including damper bar currents. A 10 kW and a 2 kW WRSM have been used to validate the proposed dynamic MEC model and control approaches, respectively. Several test cases have been run and have shown relatively strong correlation among MEC, FEA, and hardware results.
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