Variable speed operation on ground, fault-protected circuits
This new variable-speed motor has low ground, and has no trouble with GFCI circuits. It uses Dynamic Rotor™ technology switches at low frequency, producing ground currents well below the Class A GFCI limit of 6 mA and eliminating the ground fault circuit interrupter tripping that comes from high-frequency PWM switching. The motor's patented design puts the electronic power switches right in the coils in the rotating armature. Desired speed and torque is controlled by stationary light-emitting diodes on the motor's end-bell, which turn the rotating switches on and off. It doesn't need an external encoder, instead using internal speed feedback. It meets all CE standards, offers high torque at low speed and has nearly no RFI/EMI. The motor and controller are integrated together, so there are no cables between the control and the motor. The design reduces electronic circuitry and parts, making it cheaper and more reliable. It is reversible, runs up to 5,000 rpm, runs off analog or digital signals and can be programmed.
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Thanks to embedded electronics, medical devices are getting smaller and smarter than ever. Pacemakers and implantable defibrillators are now able to call physicians. MRIs, CT scanners, and ultrasound machines are gaining mobility. And the venerable Band-Aid may soon be able to detect illnesses ranging from fevers to heart arrhythmias. On February 21, join Design News senior editor Charles Murray for a wide-ranging discussion, "Embedded Angles for Medical Products," which will explore the latest developments in medical electronics. The discussion will examine advances in medical device technology and offer an inside look at the embedded electronics behind it.
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