Voltage regulator or resistors to change voltages for motors


Posted on Feb 6, 2014

After doing a little research I found out that I can change voltage by either using a voltage regulator chip or resistors. I have a couple different scenarios in which I`ll have to drop the voltage for my motors and I was wondering which method to use for each application. I`m using an H-Bridge to drive a bipolar stepper motor rated at 3. 1V. I nee


Voltage regulator or resistors to change voltages for motors
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d the stepper motor`s speed to change. Does the H-Bridge in this circuit drop the voltages as necessary to change the motors speed or is it simply able to rotate in either direction at a constant speed Driving a 7. 2V DC motor with a PWM output ( ). I believe I`m supposed to wire up the power and ground of the PWM to the motor`s 7. 2V power supply and wire the signal wire to one of the Arduino`s ports. This motor would also have to change speed. Although I`d like to use resistors for all of my voltage drops/increases I believe I read somewhere that it cant be used if the appliance its connected to has to change voltages (ex. a motor that needs to change speeds. ) Stepper Motor - Wire the inputs to an H bridge with a 3v power supply. (2 AA cells in series) Although I`m planning on giving the stepper motor a seperate power supply to simply things, if I were to run it off the same power source (6 AA cells) as the Arduino, can I use a resistor to drop 9v to 7. 2v and than supply that power to an H-bridge Which would than be connected to the stepper motor. 7. 2V DC Motor - Use an h-bridge to pulse 7. 2V to the power and ground of the PWM and pulse the signal wire to control the motors speed Or can I use resistors to drop 9v to 7. 2v and than simply pulse the signal wire to control the speed I`m not sure if the problem with the resistors dropping varying amounts of voltage depending on the motor`s load would persist in this...




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