1.

For the small, geared stepper motor 28BYJ-48:

a. Phase inductance is not provided. Suggest a test for determining it.

b. The phase inductance turns out to be 5 mH. What is the maximum speed of the output shaft (after

the gearbox) with a supply voltage of +5 Volt if we use the simple Darlington Array from Toshiba -

Spec is given in Problem 2?

Hint1: Problems 1 and 2 refer to this project:

28BYJ-48 Stepper Motor with ULN2003 + Arduino (4 Examples) (makerguides.com)

Hint2: Another discussion of this project:

How to Use a Stepper Motor: 12 Steps (with Pictures) - Instructables