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how to generate pulses of a ac motor

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waqas ikhtiar

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hi friends
i am making a project of digital techometer using 8051. My question is that how to generate pulse of a rotating motor that is being count by the microcontroller.I have done all the soft work on proteus an keil now the only thing to generate one pulse in one revolution.
can any one help me please..
 

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I think for your project , you can make rotation signal by two way :
1- use shaft encoder or build it
2- use tachogenerator
regard
 
A short list of possible sensors which can be used to provide feedback for motor control:

•Current sensors
- Shunt resistor
- Current-sensing transformer
- Hall effect current sensor
• Speed/position sensors
- Quadrature encoder
- Hall efect tachometer
• Back EMF/Sensorless control method


Here's a Microchip Appnote discussing their strengths and weaknesses:

Microchip Appnote AN894 Motor Control Sensor Feedback Circuits

Wiki - Discussing various speed sensors:

Wiki - Wheel speed sensor

One of the better Hall Effect Sensor Appnotes:

**broken link removed**

I've used both Optical and Hall Effect sensors extensively in several projects with very good results.


BigDog
 
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dv_sa559 said:
I think for your project , you can make rotation signal by two way :
1- use shaft encoder or build it
2- use tachogenerator
regard
Click to expand...
will you please guide that how can we make a shaft encoder using "ldr" or some other method you suggest
 

Yes, you can build a simple shaft encoder by many way :
1)use proximity switch with rotary disc mounted your device , **broken link removed**
2) infrared sensor (transmitter and receiver : SHAFT_ENCODER_PULSE_GENERATING_CIRCUIT - Basic_Circuit - Circuit Diagram - SeekIC.com and any other way.....
But i think tachogenerator is better for make because it is simple as you build a dc generator and coupled it to your device.
 

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