Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1993-09-14
1996-01-16
Martin, David S.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, 318599, 318603, H02P 800
Patent
active
054850703
ABSTRACT:
A stepping-motor driving system includes a driver for driving a stepping motor by switching an exciting phase thereof. The driver includes a delay-compensation-type pulse-width modulation circuit for compensating for the delay caused by the time constant of an exciting coil of the stepping motor. The delay-compensation-type pulse-width modulation circuit compensates for the delay in the rise and/or fall of the current of the exciting coil. The system also includes a memory for storing time data of the differential value of an immediately preceding exciting-phase switching time in a table of an exciting-phase switching time of the stepping motor. The system also includes a controller for controlling the driver. The controller includes a timer. The controller increments the timer until the count of the timer equals the value of one of the time data stored in the memory. The controller causes the driver to switch an exciting phase of the stepping motor in response to the incrementing of the timer to equal the value of the one of the time data.
REFERENCES:
patent: 3909693 (1975-09-01), Yoshitake et al.
patent: 4636959 (1987-01-01), Salazar et al.
patent: 4707649 (1987-11-01), Kanemura
patent: 4959738 (1990-09-01), Fujii et al.
patent: 5032780 (1991-07-01), Hopkins
patent: 5216345 (1993-06-01), Eyerly
Canon Kabushiki Kaisha
Martin David S.
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