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Braking and Regenerative Energy with AC Drives
What is Regenerative Energy? When a motor turns faster than the commanded speed as set by its AC variable speed drive, the motor in effect acts as a generator. An example of this would be the control of an elevator car as it descends. With the help of gravity, the load will readily lower. In fact
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AN109 Single Phase AC Measurements Revisited
on complex numbers and the mathematical techniques for analyzing alternating current (AC) networks. In 1897, he. published the first book on how to perform complicated AC calculations with simple algebra. Still today, AC circuit. problems are solved using simple "phasors" algebra, thanks to Charles Proteus
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Basic Output Generator Excitation and Demodulation Requirements for USD Gyroscopes
, are not as stringent as. those for gyroscope spinmotor excitation. A simple oscillator, appropriate for gyro pickoff functional. testing based on a modified Wien bridge oscillator and an LC resonator operated by a bi-polar (±DC). power supply is shown below in figure 1. Figure 1 Simple AC Sinewave
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How to: Pimp Your Ride Pack Like an Engineer Turn Your Prius Into a Backup Generator Shorten Your Commute Answer Cell Phone Calls on an Airplane Sign up with Verizon and fly Continental, Delta, United, or U.S. Airways. For $10 a month and 10 cents a
plug that connects to the Prius' plug. (The diodes keep electricity from flowing from your house to the Prius.) The UPS is in the loop to help convert the Prius' 210- to 240-volt DC power into a home's AC power. Now you're ready: If the grid goes down, connect the plugs, fire up the Prius, and feel
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Software Simplifies Testing to Military and Aerospace Standards
be done with a simple AC. Source with variable voltage and frequency. These standards can require an AC source with an arbitrary. waveform or transient generator in order to create fast transients such as dips, drops and other profiles. While these profiles can be created on an AC source, it can
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April 21, 2009 - Wind-turbine drive takes the prize at Hannover Fair
of simple ac drives for permanent-magnet motors up to 7 kW. Used with permanent-magnet ac motors without speed sensors, the AC650S Series reportedly offers energy savings and a more-compact size compared with conventional systems based on induction motors. Target applications include fans, pumps
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Improve Genset Availability By Detecting Bad Batteries Early
. of battery maintenance is that there is. no simple way to measure the battery's. ability to start an engine. There is no. Excess. Manufacturing. automatic "self diagnostic" within the. Hard to measure. heat. defects. Neglected. battery to detect plate deterioration or. state of health. maintenance
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A New Solution for Harmonics Generated by Variable Speed Drives (.pdf)
to enhance the conversion of ac power to dc power within a VSD or other equipment with a 3-phase, 6-pulse diode bridge rectifier front-end. A New Solution for Harmonics Generated by VSDs DECEMBER 1999. A New Solution for Harmonics. Generated by Variable Speed Drives. Tony Hoevenaars, P.E., MIRUS