Electric Motors

Small DC Frame Sizes

• $6 for 24V, 1000RPM - 15W - [1]

No Gearbox

• 550, 775, 895 - etc frame sizes - [2]
• Ex. 775 motor - 150W - [3]
• Ex 895 motor - 360W - $17 - 12000 RPM - [4]. Good power but fast.
• 150W for $12 - [5]

Geared

• 14W - $6 - 1000 RPM - or slow, down to 22 kg-cm [6]. Cheap but too low power.

Using Existing Drills

• Corded drills may be used as a power source.
• Cheap option, for good torque - 500W - no need to buy anything.

Treadmill Motor

• The best option for the money, $50 for 3 hp. [7]

NEMA Motor Sizes

• See Nema Stepper Sizes

Basic

• This page explores sourcing for various electric motors
• Summary: 4 hp treadmill motors (high voltage DC) are the cheapest replicable source of motors per horsepower - at $20 per horsepower. Next is 5 hp compressor motors for $180, or $60/kW. Interesting, the surplus treadmill motors are a win. Since they are 130VDC, you could rectify regular wall power or use batteries

BLDC Hub Motors

• $100/kW - [8]
• 1kW is $150 - [9]

220 AC

Best price per kW for motors - $70/kW

• 5 hp compressor motor - $180 - $60/kW - [10]
• 5 hp/ 3kW compressor - continuous duty - $215 - [11]

Weird

• 3hp AC - $30 - [12]

See Also

• Electric Motor Sourcing merge with? Yeah we should. tons of duplicate pages
• Open Source Motor/Engine Construction Set