Project Robotics - March 2009 - (Page 7) sponsor advertisement allegro aCs714 hall-effeCt sensor aVailaBle at digi-key from digi-key, the allegro aCs714 provides economical and precise solutions for aC or dC current sensing in automotive systems. The device package allows for easy implementation by the customer. Typical applications include motor control, load detection and management, switched-mode power supplies, and overcurrent fault protection. The device consists of a precise, low-offset, linear hall sensor circuit with a copper conduction path located near the surface of the die. device accuracy is optimized through the close proximity of the magnetic signal to the hall transducer. such as motors and pneumatics, to provide force feedback. for example, the phanToM premium system from sensable Technologies (figure 2) uses an active force feedback system to provide resistance in accord with the design of the teleoperation system. other active systems with multiple degrees-of-freedom have recently been unveiled for use with gaming systems. reCent haptiC researCh one of the cutting-edge areas of haptic research is called “passive haptics.” since active haptic interfaces use actuators such as motors, they present the risk that the actuators could add too much force and injure the user. passive haptic interfaces offer a safer alternative. instead of adding force figure 2 the phantoM premium system from sensable is a commercially available activehaptic device. CLiCk here for additioNaL iNforMatioN to the system, passive haptics remove force from the system, using passive actuators such as magneto-rheological brakes. passive haptic interfaces are not only inherently safer, but also more efficient, more compact, and less expensive. They also present the possibility of using energy harvesting to gather power for operating other systems. Working on passive haptic systems at northwestern university’s department of Mechanical engineering in the mid 1990s, professors J. edward Colgate, Michael a. peshkin, and Witaya Wannasuphoprasit explored the use of energetically neutral passive haptic devices that use continuously variable transmissions (CVT) as actuators that neither dissipate energy from nor add energy to the system. an early result of this work was a two- degree-of-freedom device, called a cobot (figure 3). While CVT devices are capable of Contents Viewpoint the Cutting edge for haptiC researCh Modeling CoMplex eleCtroMeChaniCal systeMs deVeloping a two-wheeled self-BalanCing transport platforM home page product training Module online ordering suppliers Catalog 7 | VoluMe 1 | nuMBer 1 http://ad.doubleclick.net/clk;212402643;32989198;m?http://dkc1.digikey.com/us/en/ph/Allegro/acs71x.html http://ad.doubleclick.net/clk;212362954;32989198;w?http://www.digikey.com http://ad.doubleclick.net/clk;212362954;32989198;w?http://www.digikey.com http://ad.doubleclick.net/clk;212363051;32989198;l?http://digikey.com/PTM/PTMMaster.page?site=us&lang=en http://ad.doubleclick.net/clk;212363300;32989198;i?http://ordering.digikey.com/ordering/addpart.aspx?site=US&source=search http://ad.doubleclick.net/clk;212363091;32989198;p?http://digikey.com/Suppliers/SupplierIndex.page?site=us&lang=en http://ad.doubleclick.net/clk;212363309;32989198;r?http://dkc1.digikey.com/us/en/pdf/Current.html
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