Hi

I want to control a car with stepper motors installed. I am looking for some high speed stepper motors that can be installed in an ordinary RC car.

Also, I want good torque with it and not too expensive either. Idea is to translate a signal from the remote control into something the stepper motor can use.

which ones can go faster?
Hybrid? Reluctance type?

 

I think you will find that steppers totally suck for this application.

Expensive, power hungry and totally inefficient.

 

Then how can I control movement by pulses?

 

How much movement do you want per pulse?

 

How much movement do you want per pulse?

sorry for not being specific, but I want the motor to atleast run at same speed as a normal RC car , DC motor runs.... idk how many rpm that is ...
RPM can be changed if i got good torque through gears I guess? so its about torque too.... Also... how much current does it need ? a normal stepper? 12V operated. I can't find the current rating for the one I bought.... also

can I use a stepper motor with micro controller if it doesn't come with a driver circuit?
Can H bridge + any stepper (5 wire uni polar) be used with micro controller?

 

a normal stepper? 12V operated.

Your making a common stepper motor mistake. The voltage rating on the motor name plate or data sheet is for a continuous non pulsing voltage. In normal use a stepper is usually driven with a voltage ~10 times the name plate voltage, to get its output rated torque.

 

I want the motor to at least run at same speed as a normal RC car

In that case I see no advantage in using a stepper motor. It's more complicated to drive than a normal brushed DC motor. You would need a proper driver circuit between a MCU and the motor.
Is this a case of "I've bought a stepper motor: now what can I use it for?" ?

 

Your making a common stepper motor mistake. The voltage rating on the motor name plate or data sheet is for a continuous non pulsing voltage. In normal use a stepper is usually driven with a voltage ~10 times the name plate voltage, to get its output rated torque.

So bybye stepper huh....

In that case I see no advantage in using a stepper motor. It's more complicated to drive than a normal brushed DC motor. You would need a proper driver circuit between a MCU and the motor.
Is this a case of "I've bought a stepper motor: now what can I use it for?" ?

Basically, this is what I want

I have an RC car.... anymore after hearing what I heard, servo is out of my system.
I am going to put a micro controller between the car motors and the signal that they get from the internal car circuitry. (the micro controller is then connected to the DC motors)

I want to save the path in this way. Like I command from RC and the signal goes in Micro controller, gets saved as well as runs the motors... later I use that signal alone to run the motors to replicate the path I made while I was driving it...

Hope I was clear enough... so for driving circuit, another question... i use relays or transistors ? what works best with arduino?

 

I want to save the path in this way.

Rather than carry the micro in the car, wouldn't it be easier to have the remote directly connected to the micro, to record and play back the button presses?

 

I just googled for "motor control for rc cars diy". Amazing number of hits (>1M). I recommend going through a number of these sites. You'll get some ideas and probably lots of questions. Then come back hear to ask your questions.

 

Rather than carry the micro in the car, wouldn't it be easier to have the remote directly connected to the micro, to record and play back the button presses?

Thats also another approach I did not think of....

so could you explain a bit more about this idea of yours?
where exactly do you recommend the placement of micro? between the button and the controller ? of remote?

 

You could wire I/O pins of the micro to the push-buttons. How difficult that would be depends on the circuitry and construction of the remote.

 

You could wire I/O pins of the micro to the push-buttons. How difficult that would be depends on the circuitry and construction of the remote.

What advantage would that have over the one with micro mounted inside RC car....

Only one I can think of is that I won't need much current maybe for transmitting signal? or would this still be a problem?

If i do that, can micro controller feed enough current to the circuit to transmit these commands?