OTHER SUPERIOR PRODUCTS

SIMILAR PRODUCTS

SOURCES FOR STEPPER MOTORS
Despite their many advantages, stepper motors aren’t nearly as common as the trusty DC motor, so they are harder to find. And when you do find them, they’re expensive when new. The surplus market is by far the best source for stepper motors for hobby robotics. See Appendix B, “Sources,” for a list of selected mail order surplus companies that regularly carry a variety of stepper motors. They carry most of the “name brand” steppers: Thompson-Airpax, Molon, Haydon, and Superior Electric. The cost of surplus steppers is often a quarter or fifth of the original list price.
The disadvantage of buying surplus is that you don’t always get a hookup diagram or adequate specifications. Purchasing surplus stepper motors is largely a hit-or-miss affair, but most outlets let you return the goods if they aren’t what you need. If you like the motor, yet it still lacks a hookup diagram, read the following section on how to decode the wiring.

Two finished stepper motor translator boards, with indicator LEDs. The board on the left controls two stepper motors; the board on the right controls four stepper motors.

Locate the common wire by following these steps. Take a measurement of each combination of the wires and note the results. You should end up with three measurements: wires 1 and 2, wires 2 and 3, and wires 1 and 3. The meter readings will be the same for two of the sets. For the third set, the resistance should be roughly doubled. These two wires are the main windings. The remaining wire is the common.

Decoding a five-wire motor is the most straightforward procedure. Measure each wire combination, noting the results of each. When you test the leads to one winding, the result will be a specified resistance (let’s call it “R”). When you test the leads to two of the windings, the resistance will be double the value of “R,” as shown in Fig. 19.17. Isolate this common wire with further testing and you’ve successfully decoded the wiring.

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