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Discussion Starter · #1 ·
I just bought a DC gear motor- I'm trying to spin a 20 pound disk at approximately 33 rpm. I realize I need to hook it up to a power source, but I'm having trouble figuring out the proper source. I'm not too keen on buying multiple 12v batteries and connecting them, also, I've heard something about converting to AC, but I'm not exactly sure how to go about doing that. I also got a DC speed controller and I'd like to use the two in conjunction. How do I do that?

Here are the specs on the motor I've got

PM DC Gear
90 vdc input
hp 1/30
full load amps 0.35
47 rpm
26 lb full load torque

Here are the speed controller specs

HP 1/50 to 1/6
Voltage Output 90
Input Voltage 115


5,990 Posts
Plus output terminal to plus motor terminal; same for the negative terminal. . .?

The motor may spin when hooked to a 12v car battery or 8 D cells in series and
you can read the controller output with a DC voltmeter, if the controller doesn't mind being open-circuited.

Post links to both items; there's always footnotes on the spec sheets hinting at some problem with some configurations.

BTW, Torque in pound-inches = 63024*HP/rpm. 1/30 hp should give you 45 pound-inches.

Idiot Emeritus
1,910 Posts
The motor and speed controller will work just fine with each other.

If the controller is labelled, connect the AC input to the terminals marked AC. It doesn't matter which is hot and which is neutral. If there's a ground terminal, connect the incoming ground there.

If you're using a cord from the controller to the motor, it needs to be 3 wire (black, white, and green). Connect the green wire to the controller ground terminal, and to the motor frame. Connect black to one of the DC output terminals, white to the other. Connect the other end to the motor terminals or wires.

If the controller has a speed adjustment built in, simply energize it, run the speed up a bit, check rotation, (if it turns backward, swap the black and white at the motor), and you're done.

If any of this doesn't make sense, or your motor or controller is different than I've described, write back.

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