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Debunking Common Myths and Misconceptions about Micro Motors in Infusion Devices

Transitioning your new infusion pump design from ideation to the concept stage involves various factors influencing motor technology selection. While initial research can offer some guidance, it often falls short of providing comprehensive and accurate insights. In this blog post, we'll delve into key considerations for selecting motor technology and review practical details to ensure your infusion pump operates efficiently and reliably.
Key Considerations for Motor Technology in Infusion Pumps
Motor Life vs. Pump Life. The operational profile for an infusion pump is determined early in the design process, establishing the average number of hours of daily use and the product life in years. These factors combined dictate the lifetime requirement for the pump, which can be applied to the lifetime requirement of the motion solution. However, the motion solution usually operates on a duty cycle, meaning it doesn't run continuously while the pump delivers the drug. To accurately determine the motor's lifespan, consider the on-time from the duty cycle to calculate the total hours the motor will need to operate over the pump's life.
A Different Motor for Extended Pump Life Requirements. When extending the warranty or lifespan of an infusion pump, such as increasing it from 2 to 4 years, engineers might assume that a different motor or technology is necessary. However, multiple factors influence a motor's lifespan in an application, including current draw versus maximum current rating, radial and axial shaft loading, and torque output versus maximum torque rating. It's essential to review the updated life requirements against the current motion solution before deciding to switch to a new motor.
DC Motor Drive Voltage. In the initial testing phase, engineers might be tempted to select a DC motor coil with a rated voltage matching the pump's input voltage. However, this might not be the ideal choice, particularly if a gearbox is included. A DC motor can be operated at a voltage range and does not need to adhere to its specified rating. The coil winding parameters determine the speed versus torque curve's slope, so the optimal coil depends on where your working point lies on these curves. When a gearbox is used, the combination of gear ratios and coil windings should be carefully evaluated through calculations to identify the best selection for optimizing performance.
Conclusion
Selecting the right motor technology for your infusion pump is crucial for its success and longevity. By considering factors such as motor life versus pump life, the potential need for different motors for extended pump life, and the nuances of DC motor drive voltage, you can make informed decisions that enhance the performance and reliability of your device.
If you have any questions or need expert advice on motion technology for your new infusion pump design, don't hesitate to reach out to Portescap’s experts. We're here to help you navigate these complexities and find the best solutions for your needs.