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Stepper Motor Tester Disclosure Number: IPCOM000080941D
Original Publication Date: 1974-Mar-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 42K

Publishing Venue


Related People

Barcomb, JG: AUTHOR [+3]


A tester for stepper motors of the bifilar type in open-loop systems is shown in the drawing.

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Stepper Motor Tester

A tester for stepper motors of the bifilar type in open-loop systems is shown in the drawing.

Each of similar driver test sections A, A, B and B has three indicating light- emitting diodes (LEDs) 10, 12 and 14 which indicate normal, open and shorted conditions. A motor testing section D has LEDs 16 and 18 which pulse to indicate an open or short in one of the motor windings. Another LED 20 will be on if the B phase resistor is OK.

To use the tester the motor is disconnected from the drivers, and the drivers A, A, B and B are plugged into the corresponding driver test sections, while the corresponding motor windings are connected in a bridge circuit in the D test section.

For dynamic tests, the drive system must operate in the slew mode. As the drivers turn on and off they trigger a retriggerable single-shot 22. The resulting pulse width is determined such that any frequency over 300 cps will not let the single-shot time out. The normal LED 10 will be on continuously under normal pulsing conditions, and the output of the single-shot 22 will gate both AND circuits 24 and 26 off.

If the driver under test is stationary (either on or off, open or shorted) the single-shot 22 will time out, enabling gates 24 and 26. If the driver is open, both inputs to 24 will be up and output down lighting LED 12. If the driver is shorted, output of gate 24 will remain high and gate 26 will be enabled, causing the shorted LED 14 to light.

In the motor test section...