Selecting a DC Coreless Coil for Initial Testing in Infusion System Applications

DC coreless motors stand out as ideal choices for Infusion System applications, particularly in battery-powered devices. These motors offer versatility with various coil options featuring different nominal voltage ratings. While the instinct may be to align the motor's nominal voltage with the device's drive voltage, optimal results aren't always guaranteed, especially when a gearhead is required. The nominal voltage rating of the DC motor plays a crucial role in influencing gearmotor performance through several key specifications:

• Torque Constant. Defined in mNm/A, the torque constant determines the current required by the motor to produce a certain amount of torque. A higher torque constant results in a lower current drawn by the motor for a given torque output.

• Terminal Resistance. Expressed in ohms, terminal resistance influences the slope of the speed/torque curve and affects the losses produced by the motor. The working point for the application can be reviewed on the speed/torque curve to determine the proper resistance to select to ensure optimal performance.
• Maximum Continuous Current. Rated in Amps, the maximum continuous current rating keeps the motor within the rated temperature rise during operation. Operating the motor at a current draw below this rating helps minimize temperature rise and enhances longevity.

If you're having difficulty choosing the right winding configuration for your DC Coreless motor, don't hesitate to reach out to the Portescap team! Our engineers are ready to assist.