Browse Prior Art Database

Position Reset For Stepping Motor Position Drives

IP.com Disclosure Number: IPCOM000048683D
Original Publication Date: 1982-Mar-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Gilstad, S: AUTHOR

Abstract

A logic circuit for the automatic position reset for stepping motor system includes two sensors. Activating the first sensor releases the reset clamp on the logic circuit, while the activation of the second sensor activates the first latch which then permits the stepping motor clocking system to activate the second latch to produce a single clock signal output.

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Position Reset For Stepping Motor Position Drives

A logic circuit for the automatic position reset for stepping motor system includes two sensors. Activating the first sensor releases the reset clamp on the logic circuit, while the activation of the second sensor activates the first latch which then permits the stepping motor clocking system to activate the second latch to produce a single clock signal output.

As shown in the figure, latch 1 is held in a reset position by the signal from the sensor S1. The output signal from the sensor S2 is directed to the clock input of the latch 1. The Q output of latch 1 is directed to the set input D of latch 2 and to one input of a NAND gate 3. The stepper motor clock is directed to the clocking input of latch 2. A reset output pulse occurs only when the drive is moving in one direction such that sensor S1 is activated first and then sensor S2 triggers the latch 1 at its leading edge. The reset output pulse is one clock period in length, such that the counting scheme on the clock pulses coming from the step motor can start the counter on the next clock pulse.

In operation, both latch 1 and latch 2 are held in a reset mode. Latch 1 is held in a reset mode by the output of sensor S1 being directed to its reset R input. Latch 2 was placed in the reset mode by the system reset signal directed to its reset R input. Sensors S1 and S2 can be photosensors. Sensor S1 is activated first, releasing the reset clamp on latch 1. When sen...