Electricity: motive power systems – Plural diverse motor controls – Running-speed control
Patent
1987-04-14
1988-06-07
Ro, Bentsu
Electricity: motive power systems
Plural diverse motor controls
Running-speed control
318254, 318275, 318374, H02P 310
Patent
active
047499230
ABSTRACT:
A motor control device provided on an electric sewing machine comprising a brushless permanent-magnet motor and in combination with a magnetic pole sensor, rotational-speed and rotational-speed polarity detector for sewing machine, detectors for needle-position and needle positioning signal, and the control systems of speed and needle stagnation thereof; with the specific ways of controlling the needle stagnant position and the strength of the reverse current for braking the motor, simple structure, less power wastage and no wearable friction clutch and brake device are needed, a quick sewing machine starting, quick stabilizing of speed control and precise stagnation of the sewing needle at a preset position can be achieved.
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patent: 4516514 (1985-05-01), Neki et al.
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patent: 4558265 (1985-12-01), Hayashida et al.
patent: 4618808 (1986-10-01), Ish-Shalom et al.
patent: 4629949 (1986-12-01), Senso
patent: 4692676 (1987-09-01), Dohi et al.
Ro Bentsu
Yong Huei Hsing Electric Industries Corp.
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