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This paper investigates the power module design for better common-mode (CM) noise performance. A high frequency full-bridge diode rectifier is studied as an example. For this circuit, a comprehensive parametric study and a proposed CM equivalent model are first presented to identify the most influential factors in CM noise generation and mitigation. It is shown that proper parasitic value and parasitics...
This paper presents a sensor-less vector control method which estimates the rotor angle and speed of a nine-phase, Interior Permanent Magnet (IPM) machine with concentrated stator winding, especially for use at starting, zero and low speed operations. The injection of unique high frequency voltage signals into a non-torque producing third sequence circuit of the machine provides current information...
A switched reluctance machine (SRM) is applicable to high speed applications due to its simple magnetic structure and mechanical robustness. During the operation of a converter, however, it causes high peak phase current which leads to a rise in the VA rating of an SRM system. Therefore, this paper investigates the reduction of peak phase current and describes the basic design procedure of an SRM...
A new three dimensional package based on Printed Circuit Board (PCB) embedded die technology is presented in this paper. The package takes advantage of the Power Chip On Chip (PCOC) concept, where commutation cell is housed within the bus bar, allowing a very low inductance design for the package of up to 0.25 nH. Two key design challenges with the package relate to the layout and the thermal management...
This paper investigates the calculation, modelling and interpretation of efficiency maps for electrical machines. The efficiency maps are calculated using a finite-element based mapping of losses, torque and flux-linkage as a function of the d- and q-axis currents and speed. For modelling efficiency maps, it is shown that a number of key loss types can be described in the form Tmωn. The effect of...
The paper presents the design and experimental results of a Thomson coil based fast mechanical switch for hybrid AC and DC circuit breakers rated at 30 kV voltage and 630 A current. The compact design with optimized circuit parameters and geometric dimensions of components targets 2 mm travel within 1 ms when driven by a 2 mF capacitor bank pre-charged to 500 V. The use and design of a disc spring...
In this paper, a multi-leg transformer structure is proposed to realize high effective turns ratio for high step-down ratio dc-dc converters. By adding an extra degree of freedom, the proposed transformer structure can reduce the number of winding layers and the cost of a planar transformer. The proposed core and winding structures effectively reduce the number of primary turns, which results in balanced...
In this paper, optimal waveforms to control constant instantaneous torque of switched reluctance motors while minimizing copper losses are computed by using the pattern search as an optimization algorithm. Optimal torque sharing using two quadratic and one linear functions is proposed to approximate the optimal torque waveforms accurately. The optimal torque sharing was verified with a 3.75 kW, 3820...
This papar proposes which the Dual Active Bridge (DAB) converter changes between Full Bridge (FB) converter's operation and Half Bridge (HB) converter's operation on the secondary side of the high frequency transformer depending on the output power. With the HB converter operation's, the iron loss of the transformer becomes small because the secondary voltage of the transformer becomes half compared...
The copper loss minimizing torque control method in the field weakening region was considered for wound synchronous machines (WSMs). In general, the maximum voltage should be utilized to minimize the stator current under the assumption that the power factor is equal to unity. Therefore, the current minimizing solutions are often found at the intersection of torque and voltage curves. However, if the...
This paper examines high speed performance of a permanent magnet (PM) machine with a reconfigurable winding (RW). First, the variations of machine parameters due to winding reconfiguration are presented and their impacts on drive system performance are investigated. To further understand system behavior, the reconfigurable ratio is set as a variable, and its effect on saliency ratio, flux weakening...
In this paper a grid compliant variable-flux PM generator topology for wind turbine applications is proposed. An analytical comparative study of a series-double excited synchronous generator and an electrically excited synchronous generator (SG) is carried out with particular focus on the amount of MMF required to satisfy grid codes. A finite element based design optimization of the proposed generator...
This paper presents a high-speed 3 kW 80 krpm surface-mounted permanent magnet (SMPM) motor for compressor applications. The design procedure using finite element analysis (FEA) is presented with a particular focus on the efficiency calculation. The paper also aims to give general indications to provide a cost-efficient solution. A prototype is built and experimental results are given and compared...
The layout of power modules is one of the key points in power module design, especially for high power densities, where couplings are increased. In this paper, along with the design example, a fast and universal layout design method for both wirebond and planar power modules is presented. Some practical considerations and implementations are introduced in the optimization of module layout design.
The estimation of electrical losses is a basic requirement for motor design based on efficiency optimization. A utility and accurate electrical loss calculation method for induction motors utilizing 2-D finite element analysis is proposed in this paper. The stator copper losses are directly calculated on the basis of Joule's Law; the rotor copper losses are expressed as the integration of current...
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