H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/20
H02P 8/00 (2006.01) H02P 25/08 (2006.01)
Patent
CA 1077126
STEPPING MOTOR USING EXTENDED DRIVE PULSES ABSTRACT A stepping motor is driven with extended pulses producing an effective excitation intermediate to the single phase and the dual phase operations. The unique drive cir- cuit creates a series of drive pulses for each motor phase so that each pulse slightly overlaps the drive pulse of the next adjacent phase. Thus, since each previous phase is still providing torque while the current in the next phase is being built up, the torque characteristics are improved, and the extended pulses are terminated before the subsequent phase is energized so that excessive power consumption is avoided. In closed loop systems, a fixed duration overlap provides the improved speed-torque char- acteristic at high speeds where the overlap is a large percentage of the drive pulse, while at lower speeds (such as when the motor is accelerating) where power consumption is greatest, the overlap is a smaller percentage of the drive pulse hence minimizing the increase in power consump- tion. This type of operation maximizes slew speed while conserving power consumption at low speeds. In open loop systems, using extended drive pulses increases the torque over that provided by single phase excitation, and the duration of the overlap may be adjusted so that large over- laps occur only where the torque needs are greatest (at times of acceleration, for example) while small overlap occur where torque requirements are low (during constant speed operation, for example), thus minimizing the total overall power consumption. -1-
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