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Patent Searching and Data


Title:
MOVING CORE LINEAR ACTUATOR
Document Type and Number:
WIPO Patent Application WO/2012/008417
Kind Code:
A1
Abstract:
Disclosed is a moving core linear actuator that can appropriately adjust offset position without leading to an increase in device size or an increase in production cost. The moving core linear actuator has a magnetic circuit (mc) that reciprocally moves a mobile element (2). The magnetic circuit (mc) is configured containing: an iron core (20) that configures the mobile element (2); a fixed element core (10) that has a facing section (10c) that faces the iron core (20); permanent magnets (12a, 12b) that are arrayed on the facing section (10c) along the direction of reciprocation and that form a pair of which each surface that faces towards the iron core has the opposite magnetic polarity; and a coil (11) that is wound around the fixed element core (10). The mobile element (2) is moved reciprocally by means of electrifying the coil (11), and in the state of the coil (11) not being electrified, an offset force (F4) acts on the mobile element (2) by means of the magnetic flux arising from the permanent magnets (12a, 12b). By means of providing an air gap (30)—having a lower magnetic permeability than the fixed element core (10) while in the state of a portion of the facing section (10c) having a cutout—between a portion of the facing section (10c) of the fixed element core (10) that is the magnetic flux path and one of the permanent magnets (12b), the offset position, which is the point of equilibrium of the offset force (F4) resulting from the permanent magnets (12) and gravity (mg) acting on the mobile element (2) is caused to be a position (ps2) that differs from the position (ps4) if the air gap (30) were not present.

Inventors:
NAKAGAWA HIROSHI (JP)
FUJII TAKAYOSHI (JP)
FUKUNAGA TAKASHI (JP)
Application Number:
PCT/JP2011/065809
Publication Date:
January 19, 2012
Filing Date:
July 11, 2011
Export Citation:
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Assignee:
SINFONIA TECHNOLOGY CO LTD (JP)
NAKAGAWA HIROSHI (JP)
FUJII TAKAYOSHI (JP)
FUKUNAGA TAKASHI (JP)
International Classes:
H02K33/00
Foreign References:
JP2006014464A2006-01-12
JP2008256110A2008-10-23
JP2002078252A2002-03-15
JP2008256110A2008-10-23
JP2006014464A2006-01-12
Other References:
See also references of EP 2595289A4
Attorney, Agent or Firm:
ONISHI, Masanao (JP)
Onishi Masanao (JP)
Download PDF:
Claims: