Sensor to Detect Shaft Rotation Direction Change Needed

[Cbronson]

I need a sensor to detect a change of direction in a rotating shaft. When the sensor detects the sudden change in direction it would trigger action of an electromagnet. The sensor would monitor either the shaft or a disk attached. A 12 volt dc power source would be used in the circuity.

 

[Japher]

http://en.wikipedia.org/wiki/Centrifugal_switch

 

[ScottyUK]

Two pulses from the shaft, 90 degrees apart. In one direction pulse A leads pulse B, in the other direction the reverse is true. A simple bit of cookbook logic will determine the direction from the pulses.


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If we learn from our mistakes I'm getting a great education!

 

[VEBill]

Same as Scotty, except why limit yourself to two pulse per rotation?

Using the basic of encoders, have dozens / hundreds / thousands of pulses per rotation (with the same two-phase approach). More pulses per shaft rotation will speed the reaction time (if required).

 

[ScottyUK]

I'm meeting the spec!!


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If we learn from our mistakes I'm getting a great education!

 

[VEBill]

Customer-written specs are ALWAYS incomplete, inaccurate, and sometimes completely impossible. ;-)