larryseibold

thank you for the drive motor tool. It would be nice to save or print the results in some easy manner. I would like to know how you handle friction at the various locations, generally promotional to weight. I would also recommend a %slope time variable to separate peak power from watt-hrs.

samantha-9

It would be great if it showed you the motor options after.

nikhil-12

tell th torque of each motor

1 reply

cbenson Regular

The torque for each motor we sell can be found on the product page on www.robotshop.com

frank-62

Thank you for this tool! Do the output(for each motor) refer to the free-run and stall torque? Or, are these values for a specific operating point?

1 reply

cbenson Regular

The torque value would what is required in that specific situation, and can be considered the maximum continuous torque. Based on observations and what motor manufacturers provide, the stall torque would be ~4x or 5x this value.

mitchberkson

Can you tell me why my result is different than yours?

Mass: 25 kg
Motors: 1
Wheel radius: 0.2 m
Velocity: 2 m/s
Incline: 0
Acceleration: 1 m/s2

You get:
Torque = 78 kgf-cm

I get:
Torque = (25 kg) x (1 m/s2) x (0.2 m) x (1/9.8 m/s2) x (100 cm/m) = 51 kgf-cm

Thanks.

1 reply

cbenson Regular

@Mitch Berkson Factor in 65% efficiency (that’s the default value), which gives 51 / 0.65 = 78.

mitchberkson

Or in this simpler example:

Mass: 1 kg
Motors: 1
Wheel radius: 1 m
Velocity: 0 m/s
Incline: 90
Acceleration: 0 m/s2

I would expect a torque of 9.8 N-m, but the calculator says 15 N-m.

mitchberkson

Thanks. The calculator and explanation are so well done that if you’re going to throw in an arbitrary number, it’s a shame not to mention it up front.