Page 4 of catalogue Motors of ElectroCraft GmbH

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Dialysis Machine
Situation: A next generation kidney dialysis machine was being designed with two modifications to the original stepper motor used for the blood pump

Typical applications for

due to problematic issues during operation. The first design challenge was the mechanism that coupled the motor shaft to the machine was a cause of long-term failure due to stress caused by point loading. The second challenge was the noise inherent to stepper motor operation was bothersome to patients who were connected to the machine for hours at a time. Solution: The motor shaft was designed and machined such that it mated directly to the pump by customizing the shaft diameter, tapping a concentric threaded hole, providing a thru-hole for set-screw and incorporating a ridge for an O-ring seal. The rotor was designed to eliminate the detent torque by skewing the normally straight laminations on the teeth. This patented design provides reduced vibration and noise from the motor when operated in all full, half and micro-stepping resolutions. Results: Working with the ElectroCraft engineering team, the medical machine manufacturer was able to resolve several problems in their original machine design with an updated design that better integrated the motor into the machine improving both the reliability and the patient experience.

ElectroCraft Stepper Motors:
• Custom OEM applications (Our Specialty) • Packaging • Semiconductor handling and testing • Antenna positioning • Laboratory equipment • Rapid prototyping Machines • Medical equipment • Dispensing

A redesigned motor from ElectroCraft improved both machine reliability and the patient experience