Step Error Measurement Using Back EMF
Original Publication Date: 1986-Dec-01
Included in the Prior Art Database: 2005-Mar-09
A variable reluctance step motor used for positioning a daisy wheel so that a correct character petal thereon is struck against a platen by a hammer is tested to determine the extreme value of absolute position error occurring in a revolution of the daisy wheel. This is obtained through using hardware of U.S. Patent 4,422,040 to Raider et al without changing the hardware or increasing its test time by changing the program of a microprocessor of Raider et al.:AB 6 p.