Using winch motor for weapon drive?

[BrentwoodSchoolRoboteers]

Brushless controllers are very expensive from what I can see. When you say heavy how much are we talking. Motors are heavy at the best of times!

Thanks.

[emisnug]

Brushless controllers are very expensive from what I can see. When you say heavy how much are we talking. Motors are heavy at the best of times!

Thanks.

In terms of weight saving, we're getting 4.5ishKw constant power (under load) for a motor weight of 1.25Kg (Slightly less now that I've chopped the excess shaft off of the end).

In comparison, a similar brushed motor (ME0708, which is admittedly the first 4.5ish KW constant motor I found on google) is 12.7Kg.

However, as Gary says, for the first couple of seconds, the raw torque generated by a brushed motor is far superior, but after those first couple of seconds (as low as .5s), it's a dead heat. For anything with a larger moment of inertia, it will be slower to spin up, but not by much - as soon as it breaks that moment of inertia, the brushless can pull more power and dump a bit more torque, so can spin up to speed perhaps 1-3 seconds slower than a brushed. Other roboteers, feel free to correct me.

Brushless motors are also more efficient in general, and don't really require servicing. The PWM curves, as Chris will tell you, are fun to deal with.