Electricity: motive power systems – Open-loop stepping motor control systems
Patent
1985-11-08
1987-05-05
Shoop, Jr., William M.
Electricity: motive power systems
Open-loop stepping motor control systems
318685, H02P 800
Patent
active
046635777
ABSTRACT:
A driving circuit for a multi-phase stepping motor including an odd number of phase windings which are sequentially connected in series to each other so that a starting end of one winding is connected to a terminating end of an adjacent winding to form an annular connection, comprises switching means each connected to a junction between two adjacent windings, and each junction is connected to a positive pole or a negative pole of a drive power source through the switching means or is not connected to any sides of the power source by means of each switching means. The switching means are alternately and repeatedly controlled so that the total number of the junctions connected to the positive pole or the negative pole of the power source when the motor is driven is two or three, or the switching means are controlled so that two or three junctions are alternately and repeatedly connected to the positive pole or the negative pole of the power source each time an input pulse is supplied. When the switching means for driving the windings of the multi-phase stepping motor are composed of two switching elements at a minimum per one phase, a desired half-step drive operation can be exactly attained. Accordingly, a circuit configuration thereof can be greatly simplified and a capacity of the drive power source can be reduced to substantially twice a rated current of the windings since the winding for each phase is connected in series or in parallel with the power source.
REFERENCES:
patent: 3866104 (1975-02-01), Heine
patent: 4000452 (1976-12-01), Heine
patent: 4095161 (1978-06-01), Heine et al.
Bergmann Saul M.
Oriental Motor Co., Ltd.
Shoop Jr. William M.
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