what is the cheapest way to have an electronic motor to accelerate, go 6 turns decelerate and stop?

Answer 1

You haven't specified an output RPM. So if you use a geared down motor which has a very low RPM you will have lots of time to count shaft revolutons and stop. You can use a simple microcontroller like a basic stamp to count input pulses. THe pulses may be generated with a simple lever switch which is opened/closed by a cam profile attached to the motor shaft. Once the count reaches 6 the uC opens a relay stopping the motor. Another simple way to control a slow speed motor (5 rpm gear drive) is with a timer which limits the duration (72 seconds) a set of electrical contacts on a relay are closed.


Faster RPM and much more precise control may also be done with a microcontroller which dirves a stepper motor.
Again the microcontroller is counting pulses it has generated to drive the stepper. Very small stepper motors may be driven directly from a uC for larger motors

Answer 2

Cheapest way would be to have a limit switch that is triggered once per revolution. Hook this to a counter. Set the counter for 6. When the counter is done, have it break the control circuit to stop the motor.

This is a very cheap and crude method to do what you want.

Better and more expensive methods would require an encoder and a processor to interface with it.

Answer 3

I had a 1989 honda that did precisely that. i found by utilising sending the vehicle in for a music up exchange into the final medicine. you may get alot of diverse solutions for the reason. My wager if thats what your finding for could be vacum leak which might reason your timing to be off which inturn slows the engine and your vehicle shuts off.