Method for controlling speed in a tape feeding, cutting and ejec

Electricity: motor control systems – Closed loop speed control system for dc motor with commutator – Armature control by digital or combined analog and digital...

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388815, 388902, 3889075, H02P 517

Patent

active

055398529

ABSTRACT:
A method for controlling the speed of a motor for a tape drive in a mailing machine includes providing an optical sensor for signaling the appearance of slots in a slotted wheel connected to the motor shaft. The time intervals between slots are used to make a prediction in respect of expected future time intervals and the motor speed is adjusted in accordance with the predicted value to obtain the desired value. For best results, the data is received at the microprocessor using the "capture" mode of operation in order to avoid excessive errors due to a "busy" processor. The invention enables the small motor of a tape drive to avoid over and undershoot even when operating under highly variable load conditions.

REFERENCES:
patent: 4513381 (1985-04-01), Houser et al.
patent: 5021781 (1991-06-01), Salazer et al.
patent: 5167002 (1992-11-01), Fridhandler
patent: 5225759 (1993-07-01), Endo et al.

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