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Submerge Scooters Background and History Motor types Lithium
Submerge Scooters Background and History Motor types Lithium

... Brushed motors are very efficient if well designed and implemented DPV's are a perfect application for brushed motors: DPV's most often used at or near full load, where brushed motors are most efficient. Simplest possible control system with zero electronics. Low RPM motors (<1000 RPM) have very li ...
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... DG system is assumed to be a combination of AC and DC sources. The AC system is converted to DC using active power factor correction technique (boost type PWM). DC-DC converter is used for voltage regulation. Boost converter is used since electromagnetic interference (EMI) is less and so reduced fil ...
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Electromechanical Devices and Machines I– EEE 343 Department
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Variable-frequency drive



A variable-frequency drive (VFD) (also termed adjustable-frequency drive, variable-speed drive, AC drive, micro drive or inverter drive) is a type of adjustable-speed drive used in electro-mechanical drive systems to control AC motor speed and torque by varying motor input frequency and voltage.VFDs are used in applications ranging from small appliances to the largest of mine mill drives and compressors. However, around 25% of the world's electrical energy is consumed by electric motors in industrial applications, which are especially conducive for energy savings using VFDs in centrifugal load service, and VFDs' global market penetration for all applications is still relatively small. That lack of penetration highlights significant energy efficiency improvement opportunities for retrofitted and new VFD installations.Over the last four decades, power electronics technology has reduced VFD cost and size and has improved performance through advances in semiconductor switching devices, drive topologies, simulation and control techniques, and control hardware and software.VFDs are available in a number of different low- and medium-voltage AC-AC and DC-AC topologies.
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