Combat Hybrid Power System Component Technologies Technical Challenges and Research Priorities (2002) / Chapter Skim
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2 Advanced Electric Motor Drives and Power Electronics
2 Advanced Electric Motor Drives and Power Electronics
Pages 15-22
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From page 15... ...
Generally, this requirement translates into operating the motor with maximum flux until the base speec} is reachecI, followec} by flux weakening in the constant horsepower region. For battery-powere(1 vehicles, it is important to design the drive system to meet the high-speec3 operating point, because the voltage and the impedance of the motor limit the current and hence the torque procluced at high speeds.
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From page 16... ...
Induction motors lend themselves to flux weakening more easily than permanent magnet motors, but they are less efficient than PM motors for full-Ioac3 operation. For inflection motor strives, the maximum voltage point can coincicle with the base speed (point A in Figure 2-~)
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From page 17... ...
for applications having little or no constant horse power region of operation. PM synchronous reluctance motors with weak permanent magnets that depend on high reluctance torque offer wider CHP range but exhibit larger torque pulsations that are detrimental to the operation of the drive system.
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From page 18... ...
in electric motors, since they tend to operate at reasonably low switching frequencies so as to limit iron loss in the motors. Further improvement in efficiency can be obtained by the use of wiclebanc} gap materials (e.g., SiC; see Chapter 4)
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From page 19... ...
increase ripple current carrying capacity. DC/DC CONVERTERS Since a high voltage is procluced in the majority of hybrid power systems on vehicles, it becomes imperative to have a DC/DC converter to supply all the auxiliary loads on the vehicle.
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From page 20... ...
design parameters quantitatively linked to changes in overall system performance Expansion of current research to validate models and link motor design programs with power electronics and drive simulation programs 20
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From page 21... ...
. pact caging size Low loss materials that can be readily manufactured in laminar form Techniques for injecting magnetic materials into the rotors, and curing and magnetizing them onsite Development of wideband gap materials such as SiC Development of thermal management systems with phase transition and other materials to remove heat quickly from the power devices and inverters and improve transient performance Integration of SiC diodes with insulated gate bipolar transistor hard switched inverters to reduce reverse recovery transients to yield low EMI and high efficiency comparable to soft switching inverters Fundamental research on materials to meet these requirements Design tools for optimizing the combination of devices required and other characteristics, e.g., switching frequency Development of high thermal conductivity materials such as graphite foams and silicon carbide, in combination with phase transition fluids 21
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From page 22... ...
2000. Thermal Management Solutions Utilizing High Thermal Conductivity Graphite Foams.
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