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Design News, May 2013

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M E D I CA L DESIGN APPLICATIONS Motors for Portable Medical Devices Understanding the advantages of different motor technologies is essential for designing motion solutions for low power, portable medical applications. D Different motor technologies each offer motion solutions with distinct advantages for different types of portable medical devices. These motion solutions are contributing to new portable medical devices that are smaller, lighter, more powerful, and often cheaper than ever before — and designed for global distribution. New slotless, brushless ECS Series motors from Portescap are targeting hospital invasive ventilators and home care bi-level respiratory machines, where high-speed operation and highly dynamic control are used to quickly adjust the pressure output of the ventilation system. T6 T REND WAT C H : ME D I C A L / A S U P P L E M E N T T O D E S I G N NE WS MAY 2013 magenta cyan yellow black New Slotless Brushless Motors A new line slotless brushless motor design from Portescap called the ECS Series is targeting applications in respiratory therapy ranging from hospital invasive ventilators to home care bi-level respiratory machines, where high-speed motor operation and highly dynamic control are required to quickly adjust the pressure output of the ventilation system. "Primary improvements have been made to the stator and magnetic circuit to enable lower iron losses and increase efficiency, responsiveness, and life. By improving motor efficiency, we have been able to significantly reduce the temperature rise of the motor in operation," said Jonathan Martha, North American medical segment manager for Portescap. "In terms of responsiveness, we have been able to dramatically reduce the lag time for a respirator or ventilator to respond when a patient requests air, how quickly the device is able to deliver. Plus in terms of efficiency, we have been able to achieve up to and above a 90 percent efficient motor." One customer is using these slotless motors to design a new ventilator which will potentially eliminate the need for the motor cooling system and fan electronics altogether. The motor's improved efficiency has reduced the temperature rise enough to remove the cooling mechanism. Eliminating the cooling system would reduce the cost, size, and weight of the end device. Since power considerations are important and higher efficiencies require less current input to achieve the same output, applications are able to achieve a higher power output. This allows design engineers to make some trade-offs, and potentially lower the power source to lower costs. With a battery-operated mobile device, battery technology continues to improve but it is still one of the limiting factors of most portable medical [www.designnews .com] ES245662_DNTW1305_T6.pgs 05.03.2013 01:32 UBM Source: Portescap BY AL PRESHER, CONTRIBUTING EDITOR

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