Driver circuit arrangement for a stepping motor

US4032827A · kind A · utility

Assignee

• Timex Corporation · US

Inventors

• Eduard Dobratz
• Herbert Schwartz · Wurmberg, DE

Key dates

• Filing date: Mar 15, 1976
• Grant date: Jun 28, 1977
• Expiry date: Mar 15, 1996

Classification

• Technology area (CPC G): Physics
• CPC primary: G04C3/143
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A crystal oscillator controlled stepping motor for a timekeeping device having the high frequency oscillator coupled to a divider which reduces the oscillator frequency to the required output frequency which, in turn, is coupled to the driver circuit arrangement. The driver circuit arrangement provides drive pulses to the stepping motor in response to the output of the divider and a feedback signal from the stepping motor. The driver circuit arrangement in response to the output of the divider and the feedback signal detects faulty indexing steps and skipped or missed indexing steps and provides drive pulses to effect a remedial action.