By activating more than one coil at a time we can increase the power of the motor. Although functional, this technique only gives the motor half the torque it could have. The circuit as described thus far actuates only one coil at a time and is called "Wave-Drive". However, we wanted to take this circuit a step further. This plus a ULN2003 darlington array and an external clock source would have been enough to drive the motor and fulfill proof-of-concept. The basics of the circuit are nothing special: a 4029 binary counter is configured as a 5-stage counter (0,1,2,3,4,0,1,2,3,4,etc.), and its binary outputs are decoded to 5 signal (phase) lines by a 4028 BCD-to-Decimal decoder. Now, ETC does make the PMM5303 HIC for 5-Phase Stepper Motors chip, but we ended up making our own driver consisting of commonly-available IC's and one custom GAL. Being as it's a 5-phase rather than your more standard 2-phase stepper motor, finding an existing driver box or chip to run it proved to be rather impossible, if not cost-prohibitive. The motor is a Seagate part #54173-001 or #72060-440 hard drive motor. Anyone else pick up one of those ten-wire, 5-phase stepper motors from Ax-Man and want to know how to drive it? We did!
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