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View Full Version : Multi-Speed motor Questions

Burg
12-23-2004, 01:08 PM
These motors, from the robovation kit, didn't come with any information and I haven't been able to find much about them. I was wondering how much power do they have? Are they capable of lifting an object, if the setup was properly designed?

Any help would be great, Thanks.

Kevin Sevcik
12-23-2004, 01:19 PM
Peak power looks to be about 2.2-2.3 Watts. This would be the limiting factor in just how fast you can lift something if you perfectly design your motor. 2.3 Watts = 1.7 foot pound-force/second. So with a 100% efficient lifting device, you could lift a 1.7 pound weight at 1 foot per second or a 3.4 pound weight at .5 feet per second, assuming you got the gearing just right.

Generally speaking, most motors can lift a surprisingly large amount of weight, assuming you gear them down enough.

In a general sense, http://www.innovationfirst.com/FIRSTRobotics/edu-motors.htm gives you a rough torque-speed curve. You can use this to figure out just how fast the motor will turn at a given torque load. Designing around peak power is just highly useful in situations where you have a well-defined load or range of loads.

Side note: Last year I designed around peak power to figure out how much to gear down the window motor to lift our robot at max speed. Or more precisely, at close to max speed with enough safety factor to lift an entire second robot at decent speed.

Burg
12-23-2004, 03:54 PM
sweet, just the thing I was looking for. Thanks alot for the help. I'm averaging about 3 pounds, after more thought. Time restriction is nothing much to worry about. I was just curious if the motors could even take it.

Thanks again!