Title:
MAGNETIC CLAMPING DEVICE
Document Type and Number:
WIPO Patent Application WO/2024/004503
Kind Code:
A1
Abstract:
Provided is a magnetic clamping device in which the power consumption of a magnetizing coil made of a magnet material capable of reversing the polarity is reduced. A magnetic clamping device 10 comprises: an alnico magnet 16 in which the polarity can be reversed by a neodymium magnet 18 and a magnetizing coil 17; a controller 7; a rectification circuit 31; and a first reflux circuit 32. The rectification circuit 31 performs half-wave rectification on an alternating-current power source, supplies positive-side pulses to the magnetizing coil 17 for a given period when being instructed by the controller 7 to magnetize the magnetizing coil 17, and supplies negative-side pulses to the magnetizing coil 17 for a given period when being instructed to demagnetize the same. The first reflux circuit 32 includes a diode 34 and a switch 35 that are serially connected to each other, returns a current obtained from back electromotive force resulting from turning on the switch 35 during the period in which magnetization is instructed by the controller 7 and forming a closed circuit with the magnetizing coil 17, and turns off the switch 35 during the period in which demagnetization of the magnetizing coil 17 is instructed by the controller 7.
Inventors:
YOSHIDA MASAKAZU (JP)
Application Number:
PCT/JP2023/020414
Publication Date:
January 04, 2024
Filing Date:
June 01, 2023
Export Citation:
Assignee:
KOSMEK LTD (JP)
International Classes:
B29C33/32; B29C45/64; H01F13/00
Domestic Patent References:
| WO2020241090A1 | 2020-12-03 |
Foreign References:
| JPS55100069A | 1980-07-30 |
Attorney, Agent or Firm:
KASEGUMA Tsuguhisa (JP)
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