- #1

D.B0004

- 17

- 0

## Homework Statement

2-1. A constant torque of 4

*Nm*is applied to an unloaded motor at rest at time

*t = 0*. The motor reaches a speed of 1717

*rpm*in 4

*s*. Assuming the damping to be negligible, calculate the motor inertia in

*Nm·s2*.

## Homework Equations

T = J(eff) * dw/dt

J = kg*M^2

## The Attempt at a Solution

I have NO clue where to start. First question - why is the motor inertia units stated as Nm*S2? I thought moment of inertia was only kg*m^2 (m = meters).

Second question - can someone point me in the right direction? I have been reading for hours. I know this is simple I'm just missing a link. Thanks for the help.

Also the problem seems basic but I posted it in this section because its for a 4000 level course - Electric Drives. Let me know if it should be elsewhere.