Vibration (pager motor)
The 3 kinds of motors currently in the Cyborg parts bucket. Some specs on these are in the vibromotor spreadsheet
- The first number in the 'at this V' column is the lowest voltage we were able to get the thing to go on at all. We usually had to help it get started.
- The next column, 'draw at (mA),' is the draw at that voltage, according to the really lovely fancy power supply upstairs with the digital outputs.
- The ohm values are just division according to Ohm's Law, V / I = R .
- The power consumption of the motors tested is P = V * I .
The thinking behind 'starts from Most Stuck' is that the point at which it stops on its own is the stickiest point, and it would be good to know how much voltage it takes to overcome that. The process we used is this:
- get the motor running
- drop the voltage until it stops
- raise the voltage until it starts on its own
- repeat once or twice
It is likely to vary on a motor-to-motor basis but this is at least a starting point. Likely PWM is going to be a more consistent and cleaner way to vary the feel of the vibration. I'd like to come up with some PWM specs, not sure yet what those would be exactly.
Cmaier 04:03, 30 July 2009 (PDT)
For an unrelated IRC discussion, I came across a PWM driver IC that might be interesting for driving vibrator motors, too: ON Semiconductor CAT4109. It's available through Digkey. More can be found here.