Magnetic circuit with opposing permanent magnets

Details Magnetic circuit with opposing permanent magnets Magnetic circuit with opposing permanent magnets

2005-08-02

2005-08-02

Barrera, Ramon M. (Department: 2832)

Electricity: magnetically operated switches, magnets, and electr

Magnets and electromagnets

Magnet structure or material

C335S302000, C335S306000

Reexamination Certificate

active

06924722

ABSTRACT:
To reduce the cost of the magnet of magnetic circuits with opposing permanent magnets by ensuring that inexpensive magnets having a low coercive force can be used without substantial loss of magnetism caused by demagnetization fields, there is provided a magnetic circuit with opposing permanent magnets, comprising: a pair of permanent magnet units opposing each other across a gap, the pair of permanent magnets being magnetized in thickness direction, wherein each of the permanent magnet units comprises at least two types of permanent magnet pieces with different coercive forces, and wherein, the permanent magnet piece that receives the largest demagnetization force when the permanent magnet units are manufactured has a larger coercive force than at least one other type of the permanent magnet piece; a yoke magnetically coupled to the permanent magnet units, and provided outside of the permanent magnet units and the gap; and a pair of pole pieces each arranged on a gap side of an opposing surface of each of the permanent magnet units and having a peripheral projection in opposing direction.

REFERENCES:
patent: 4401960 (1983-08-01), Uchikune et al.
patent: 4675609 (1987-06-01), Danby et al.
patent: 4777464 (1988-10-01), Takabatashi et al.
patent: 5055812 (1991-10-01), Abele et al.
patent: 8339916 (1996-12-01), None
patent: 0978727 (2000-02-01), None

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