Reel type slot machine
having stepper motor monitoring system
Issue Date: August 17, 1999 Inventors: Rodesch; Gregory L. (Oceanside, CA); Rodesch; Dale F. (San Diego,
CA) Appl. No.: 818850 Filed: March 17, 1997
Abstract
A reel-type slot machine includes a microprocessor driven game control circuit for randomly determining a game
result and three reel assemblies each including a symbol-bearing reel driven by a stepper motor for displaying the game results. The stepper motors each include a permanent magnet rotor and four
stator windings which respond to quadrature phase motor drive signals generated by the game control circuit to incrementally rotate the reels. A reel motion monitoring circuit senses back EMF on
each stator winding to generate an error signal which inhibits play in the event a motor fails to respond to an applied drive signal or a reel is moved by tampering.
