Appliance Design - October 2008 - (Page 24) MOTORS Nanomotion PZT motors uses 2 AC Sine waves to generate an ultrasonic standing wave. Motion Medical devices employ novel technologies. Magnets M ost motors are made of metal and they use permanent magnets, electromagnets, or a combination of both to induce motion. While these magnetic motors are perfectly suitable for the vast number of potential applications there are some applications, particularly in the medical industry, that require motors that are not made of ferrous materials and that do not use magnets. Prime examples are medical instruments and the robots and other equipment that handle them when the devices are used in or around medical imaging devices such as a magnetic resonance imaging (MRI) machine. Here, traditional motors can pose safety and image quality concerns. This is an especially acute issue as these imaging machines become more prevalent and their uses expand beyond capturing multi-dimensional images of their subjects. Increasingly, MRIs are being used in real time with automated or semi-automated test systems, and by doctors remotely manipulating surgical tools, injection pumps, probes, manipulators, and other such devices while using the MRI images to guide their efforts. These types of applications have put pressure on manufacturers to use motor technology that will be safe to operate within the confines of an imager. An MRI machine uses magnetic signals, rather than X-rays, to create image “slices” of the patient. To generate these signals, primary and secondary magnets are used and this can be problematic for devices that use traditional motors. The trouble is that traditional motors contain ferromagnetic metals that can pose a safety hazard when used in machines that have high magnetic fields, such as an MRI. With the very high magnetic interaction forces at work, heating may occur in conductive materials by electromagnetic induction. Metal objects employed in or near an MRI system can be sucked into the machine, drawn by the strong magnetic forces employed. These devices use pulsed magnetic and radio frequency fields of very www.applianceDESIGN.com Without by larry adams 24 applianceDESIGN October 2008 http://www.applianceDESIGN.com
Table of Contents Feed for the Digital Edition of Appliance Design - October 2008 Appliance Design - October 2008 Contents Editorial Shipments/Forecasts News Watch Prototyping - Materials Play the Part Prototyping - Mix & Match Motors Electronics Coatings Design Marts Association Report: AHRI Advertiser's Index Appliance Design - October 2008 Appliance Design - October 2008 - Appliance Design - October 2008 (Page Cover1) Appliance Design - October 2008 - Appliance Design - October 2008 (Page Cover2) Appliance Design - October 2008 - Appliance Design - October 2008 (Page 1) Appliance Design - October 2008 - Appliance Design - October 2008 (Page 2) Appliance Design - October 2008 - Contents (Page 3) Appliance Design - October 2008 - Editorial (Page 4) Appliance Design - October 2008 - Shipments/Forecasts (Page 5) Appliance Design - October 2008 - News Watch (Page 6) Appliance Design - October 2008 - News Watch (Page 7) Appliance Design - October 2008 - News Watch (Page 8) Appliance Design - October 2008 - News Watch (Page 9) Appliance Design - October 2008 - News Watch (Page 10) Appliance Design - October 2008 - News Watch (Page 11) Appliance Design - October 2008 - Prototyping - Materials Play the Part (Page 12) Appliance Design - October 2008 - Prototyping - Materials Play the Part (Page 13) Appliance Design - October 2008 - Prototyping - Materials Play the Part (Page 14) Appliance Design - October 2008 - Prototyping - Materials Play the Part (Page 15) Appliance Design - October 2008 - Prototyping - Materials Play the Part (Page 16) Appliance Design - October 2008 - Prototyping - Materials Play the Part (Page 17) Appliance Design - October 2008 - Prototyping - Materials Play the Part (Page 18) Appliance Design - October 2008 - Prototyping - Materials Play the Part (Page 19) Appliance Design - October 2008 - Prototyping - Materials Play the Part (Page 20) Appliance Design - October 2008 - Prototyping - Materials Play the Part (Page 21) Appliance Design - October 2008 - Prototyping - Mix & Match (Page 22) Appliance Design - October 2008 - Prototyping - Mix & Match (Page 23) Appliance Design - October 2008 - Motors (Page 24) Appliance Design - October 2008 - Motors (Page 25) Appliance Design - October 2008 - Motors (Page 26) Appliance Design - October 2008 - Motors (Page 27) Appliance Design - October 2008 - Motors (Page 28) Appliance Design - October 2008 - Motors (Page 29) Appliance Design - October 2008 - Electronics (Page 30) Appliance Design - October 2008 - Electronics (Page 31) Appliance Design - October 2008 - Electronics (Page 32) Appliance Design - October 2008 - Electronics (Page 33) Appliance Design - October 2008 - Electronics (Page 34) Appliance Design - October 2008 - Electronics (Page 35) Appliance Design - October 2008 - Coatings (Page 36) Appliance Design - October 2008 - Coatings (Page 37) Appliance Design - October 2008 - Coatings (Page 38) Appliance Design - October 2008 - Design Marts (Page 39) Appliance Design - October 2008 - Association Report: AHRI (Page 40) Appliance Design - October 2008 - Advertiser's Index (Page 41) Appliance Design - October 2008 - Advertiser's Index (Page Cover4)
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