Hello,
What is the approximate inductance of a small 110V C-frame motor, in its native laminated core environment?
I've got a few C-frame motors in my pile of junk, and am wondering if I can just use them as-is in some MC34063 experiments.
Thanks,
Michael
Basically, the inductance is undefined. If you allow the rotor to move, it turns into a motor/generator/flywheel, and if you use higher frequency than 60 Hz, you don't get the core to fully engage (there's a skin depth). So, it is a resistor instead of an inductor at full power and rated frequency (60 Hz), and a lossy inductor (possibly
1 Henry or so) at low frequency if you clamp the rotor stationary, or use such low current that friction keeps it stationary. And it's a smaller inductor at higher frequencies with the rotor clamped.The variable results you'd get with inductance-measurement devices will just be confusing: it isn't really intended to be a proper linear circuit element for the purpose of a switchmode power supply (MC34063). Scavenging a ferrite bar with a winding from a dead wall-wart power brick is my recommendation.
Ok thanks!
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