Temporary Yaesu Elevation Rotor Fix
Earlier I fried my elevation motor, and I was in need of a quick fix.
The plan is to eventually rewind the original 24VAC motor but this will take some time and materials I do not have for the time being.
The quick, non-destructive solution was to get a $7 worth 24VDC motor, and put that in to service.
All I had to do, besides the rectifier system, was to drill two new holes in the motor bracket and move the cogwheel over to the DC motor shaft.
The ZHENGKE ZGA25RP DC 24V 500RPM Micro Gear Box Motor have an unload speed at about 500 rpm, so the elevation is moving at about 1/5 of the original speed. However, this is more than sufficient when tracking the moon. The stall torque is also sufficient due to the low gearing.
I am considering to get a larger, faster and more powerful DC motor, but then I will have to ether do a non-reversal cogwheel modification or get hold of an another cogwheel that will fit.
Left: Original 24VAC motor.
Right: very small 24VDC motor fixed to the original bracket .
DC motor, rectifiers and relay in place.
schematics
Hello,
Sometime ago, I solved similar problem with my Kenpro rotor (predecessor of the Yaesu), I left it rewinded and it worked again. The reason of buring was missing stop switch on the end of the dial. The motor got there and stopped there and with no cooling it burned. Even in the original there was a waring that after 1minute work it must be 1minute peace period.
I would like to know, if you have seen some problems with the spark noises from the motor, I am using for elevation the Superjack, which has DC motor and although there is (simple) LC filtering, I hear it in the 2m and 70cm radio, when motor is on.
BR from Prague,
OK1VAW, Vojtech
Hi there Vojtech
Yes, there is some sparke noise comming from the DC-motor.
So it is not sn ideal solution.
73
Geir