Wednesday, May 23, 2007

Screwdriver Antenna Update

I finally found a driving motor to drive the driving rod. I found the motor from the junk yard where they sells some used stuff. I tested the motor and it is working fine. It has a speed of arounf 500rpm with a torque of abt 2-3kg. This motor is actually called "gear motor" as it has a gearbox which will convert the speed of the motor from fast to slow and at the same time increase the torque. The gearbox has a gear ratio of 22:1 which means the motor will rotate 22 times and the output shaft will rotate 1 times. Therefore, to have a 500rpm with a gear ratio of 22:1, we need the motor to have 11,000rpm.

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