I have a small DC motor being driven by a controller which supplies +6V/-6V to the motor to control its speed and direction (elliptical machine resistance control motor). The issue is that 6Vs is not provide enough speed/power from the motor, but if I drive the motor with a 9V or 12V battery it works sufficiently. The controller determines the position of the mechanism with a potentiometer and changes the driving voltage accordingly until the correct position is reached. What I would like to do is double the voltage being supplied to the motor (to +12V/-12V), while leaving the rest of the system intact. I have been trying to research simple cheap boost converters, but I cannot figure out if these devices can take a varying +/- input voltage and output the corresponding +/- voltage with double the amplitude. Thanks in advance for any insight anyone can provide.

  • \$\begingroup\$ Unless you define the specs for input and load power, temp rise, peak load current, DCR, driver design , your question is unanswerable. \$\endgroup\$ – Sunnyskyguy EE75 Jan 15 at 15:57
  • \$\begingroup\$ Maybe I am really showing my limited electronics understanding here, but I would not think this would all be necessary for a small low power DC circuit. I am sure the motor is drawing only a few hundred milliamps at -6V/+6V. Is there not a kind of boost converter that could simple multiply (1.5X, 2X) my positivite and negative input voltages, while providing a current up to perhaps 1A? Even a boost device using an external 12VDC or 120VAC power supply would be acceptable. If it weren't for the varying -/+ input voltage I would have thought a standard hobby grade boost converter would work. \$\endgroup\$ – jslade11 Jan 15 at 18:57
  • \$\begingroup\$ What is the motor DCR? \$\endgroup\$ – Sunnyskyguy EE75 Jan 15 at 18:57

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