Experimental results for tiny, geared, brushed, DC motors and small, thinfilm solar cells

TT Motor makes a tiny, brushed, geared, DC motor: TGPP06.  Firgelli Automation will sell you one model for $15.

Powerfilm makes a credit card sized, thinfilm(plastic) solar cell SP3-37.  Jameco sells them for about $4.

What happens when you connect them and expose to direct, full sun?

The TGPP06 is a family.  All models are about the size of ‘pager’ motors.  The family uses the same 3V nominal motor.  Family members all have a plastic, planetary gear set on the end of the motor.  The length of the gear set differs among the family members ( one extra planetary gear group over the preceding family member.)

  • TGPP06-C:  1/26.5 gear redution, 980 rpm loaded, 1250 rpm no load, stall torque 120 g.cm
  • TGPP06-D-136: 1/136 gear reduction, 190 rpm loaded, 240 rpm no load, stall torque 400 g.cm
  • TGPP06-D-700: 1/700 gear reduction, 37 rpm loaded, 47 rpm no load, stall torque 800 g.cm

That’s from their data sheets.  (Their data sheets don’t  always seem consistent. I’m wondering about the torque specs, which don’t seem correct for the gear ratios.)

The Powerfilm SP3-37 is a panel (solar cells in series) putting out 3V at 22 mA at ‘operating conditions’ which is approximately full, direct sun with a suitable load (approximately at the maximum power point on the current to voltage curve?)  See their data sheet.

Experimentally when connected to a SP3-37, the TGPP06-D-700 turns at about 15 rpm in full, direct (perpendicular to the panel) sun.  Under bright overcast (the sun behind a rare cumulus cloud) the motor stopped turning.

Experimentally when connected to a SP3-37, the TGPP06-D-136  turns at about 120 rpm in full, direct (perpendicular to the panel) sun.  In full sun, I could not stop the rotation by pinching the rotor shaft with my fingers (but it is very small, and hard to pinch with your fingers.)   When held at 45 degrees to full sun, it turns more slowly, a few tens of rpm.

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s