Abrading – Precision device or process - or with condition responsive... – With feeding of tool or work holder
Patent
1993-10-26
1996-11-12
Lavinder, Jack W.
Abrading
Precision device or process - or with condition responsive...
With feeding of tool or work holder
451 28, B24B 4902
Patent
active
055734430
ABSTRACT:
A spindle arrangement is provided for either holding a workpiece or mounting a working tool onto a rotary shaft in a cutting/grinding process. The spindle arrangement includes radial magnetic bearings for rotatably supporting the rotary shaft in a radial direction thereof by using suction forces of electromagnets, displacement sensors provided in the radial direction of the rotary shaft for measuring an amount of positional displacement of the rotary shaft, and a controlling device for comparing the measured amount of the positional displacement and a displacement command and then changing the suction forces of the radial electromagnets based on the compared result so as to cause agreement between the measured amount and the command. Instead of or in addition to those elements, the spindle can include a thrust magnetic bearing for rotatably supporting the rotary shaft in a thrust direction thereof by using suction forces of electromagnets, a displacement sensor provided in the thrust direction of the rotary shaft for measuring an amount of displacement of the rotary shaft, and a controlling device for comparing the measured amount of the displacement and a displacement command and then changing the suction forces of the thrust electromagnets based on the compared result so as to cause agreement between the measured amount and the command. A method for operating the spindle is also provided.
REFERENCES:
patent: 4180946 (1980-01-01), Heijkenskjold
patent: 4956945 (1990-09-01), Ooshima
patent: 5024025 (1991-06-01), Kihara
patent: 5027280 (1991-06-01), Ando
patent: 5133158 (1992-07-01), Kihara
patent: 5205078 (1993-04-01), Takara
Nakagawa Toru
Takahashi Masayuki
Yasuda Issei
Lavinder Jack W.
Matsushita Electric - Industrial Co., Ltd.
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