Society of Robots - Robot Forum
Electronics => Electronics => Topic started by: George221 on February 27, 2013, 04:20:11 PM
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i have 6 Polymer Lithium Ion Battery - 2000mAh and 3.7 V
(http://www.azlabs.net/store/index.php/polymer-lithium-ion-battery-2000mah.html (http://www.azlabs.net/store/index.php/polymer-lithium-ion-battery-2000mah.html))
and i want to use them to control two stepper which required 12V and 0.68A
(http://www.robotshop.com/ca/rbsoy14-soyo-unipolar-stepper-motor.html (http://www.robotshop.com/ca/rbsoy14-soyo-unipolar-stepper-motor.html))
do i need a battery with above 0.68A to run the stepper?
do i need to make the battery in parallel to have above 0.68 A current to run the stepper or make three of them in series and run with 12V and 2000mAh
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2000 mAh = 2 Ah
2 steppers at .68 A each = 1.36 A
the batteries will work fine
run batteries in series for 12 V
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Three batteries in series to get to 12V.
Two such strings in parallel for longer runtime.
Usually no need to separate different batteries for different motors.
Also, what is the C rating of the batteries?
A LiPo can typically drive its mAh rating in amps well - this is known as "1 C."
Many modern batteries can drive more (but for a shorter duration.) For example, a 20 C, 2000 mAh battery could drive up to 40A of current without overheating/safety concerns.