Date: Sat, 28 Feb 2015 11:02:00 -0600
From: Patrick Greenlee <patrick_g@windstream.net>
To: towertalk@contesting.com
Subject: Re: [TowerTalk] SteppIR
That is why it is called a stepper motor. Its motion is stepwise, not
continuous, think digital not analog. If the steps are small enough and
are taken rapidly enough you can closely simulate the smooth turning of
an analog motor. Of course an advantage of the stepper motor is you can
keep track of where you are by counting the steps and not need a shaft
encoder or other method of tracking position in a system driven by an
analog motor. Stepping motors make position servos simpler.
Patrick NJ5G
## whats wrong with installing a shaft encoder on the plane jane DC..or AC
motor? That’s what K7NV does on his prop pitch conversions..and works
slick..simple concept, easy mod to any motor. Its all fed to the Green Heron
box...which is a modified RT-21.
## The GH box for the small PP only puts out one dc voltage, that’s it. The
oem 28 vdc motor in the PP uses the PWM in the GH box to control the speed
of the PP. So that way you can ramp up and ramp down...sorta like a
8 speed automatic transmission in a car. .1 deg readout, pre sets, the whole
9 yards.
## PWM works slick on DC motors. It allows you to slow the motor way down,
without losing torque..... like you get if you try and slow down a motor by
reducing
its voltage.
Jim VE7RF
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