how to Drive 3volts motors rated 4-5Amps

Other Hardware Motors, Mechanics, Power and CNC
1

Hello,

I have some tamiya motors and would like to use them on a project, the problem is when i looked up the data sheet of my motor (Tamiya plasma dash 4WD). the motors are at 3volts , 4-5amps. this is quite difficult since L293d only drives motor above 4.5 volts at 1A.

Any suggestions? and please recommend something using common parts since i live in a third - world country, and some things are not easy to find. Thanks

2

If the motors are to run in just one direction, use a logic level MOSFET, like this one. You need a 150 Ohm resistor between the gate and the Arduino output pin.

3

jremington:
If the motors are to run in just one direction, use a logic level MOSFET, like this one. You need a 150 Ohm resistor between the gate and the Arduino output pin.

Thank you for that, I have not yet finalize my decision if i want it to turn in both direction.

but if i do decide to make it bidirectional do you have a suggestion ?

4

For bidirectional motion, you need a low voltage motor driver capable of handling the stall current of the motors, which can be 5 to 10 times the running current. What is that stall current?

Pololu has the best selection of inexpensive motor drivers.

5

jremington:
For bidirectional motion, you need a low voltage motor driver capable of handling the stall current of the motors, which can be 5 to 10 times the running current. What is that stall current?

Pololu has the best selection of inexpensive motor drivers.

Just measured the motors current, I am getting

around 1.5 A of No load
around 2.8 A of with load
and A stall current of around 4.5A

sadly Pololu is not in my country and would take very long (around a month) to arrive if i ever buy from them, which is not ideal in my situation.

6

Life can be, at times, nonideal.

7

From searches I have done for my own purposes high-current h-bridge drivers that work at low voltages are not common.

I recently ordered some ROHM BD6212 ,motor drivers (not yet arrived). They claim to be able to handle 2 amps. Maybe it would be possible to use a pair in parallel for 4 amps.

...R

8

A relay could change motor direction, and a mosfet control (PWM) speed.
Leo..