# Stepper motor rated power?

Discussion in 'Sensors and Actuators' started by eem2am, Aug 26, 2010.

1. ### eem2am

414
0
Aug 3, 2009
Do you know what is the rated power of this stepper motor?

It is the 6V, 18.5 Ohms per winding (UBB1/5) type…….

-the stepper has two windings.

Am I right in assuming that this stepper motor’s rated power is 2 * V^2/R = 3.89W ?

If the rated power is indeed this figure of 3.89W, is it ever permissible/adviseable to drive this stepper motor with a power higher than this rated value?

-If so , then for how long may I drive the stepper motor at a power level which is higher than the motors rated power level?

2. ### Resqueline

2,848
2
Jul 31, 2009
Your power assumption is correct if the motor is stopped at a half-step. Running in half-step mode it will consume 3W average. I can't say for how long it'll take this though.
Temporary overpowering tolerance is determined by mass, time, & max allowable temperature. In the ordinary single stepping mode it will consume 2W regardless.
Single stepping mode only applies power to one coil at a time. Half-stepping applies power to two coils simultaneously in-between the single-step positions.