can some one please give me some idea on how to build a zero speed sensor switch.

I want the sensor to give me an output signal when my motor speed is exactly zero. This will act as a swith to start the power in and run the motor in reverse direction.

can i use some simple micro switch or something?

 

You first need to create some kind of feedback from the motor so that you can tell that it is rotating. It can be magnetic hall effect, optical sensors, mechanical, electrical, ...

What type of motor are you using? How are you controlling the motor, microcontroller?

 

Also, what is the anticipated slowest speed when the motor is moving? Your sensor will need to differentiate between the two.

 

Thanks a lot alberto.

I am using an ac universal motor. i want the switch to give me a pluse when the speed is Zero. The motor will be operating around 350 rpm.

i was searching the web and got some good hall effect direction and speed sensors from Allegro that i think i can use.

thanks for the feedback.