Reel type slot machine having stepper motor monitoring system

Details Reel type slot machine having stepper motor monitoring system Reel type slot machine having stepper motor monitoring system

1997-03-17

1999-08-17

O'Neil, Michael

Amusement devices: games

Including means for processing electronic data

In a chance application

273143R, 318685, A63F 922, G05B 1940

Patent

active

059385294

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.

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