C-Shaped Latching Relay for Compact Magnetic Circuit
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Solution Overview
Problem
The existing latching relay design is bulky due to the stacked alignment of the electromagnet, auxiliary yoke, permanent magnet, and movable iron piece, which hinders size reduction, and is prone to improper contact switching under mechanical vibrations or impacts.
Innovation Solution
A C-shaped fixed iron core with an exciting coil and magnetic pole pieces, where the permanent magnet is sandwiched between bar-like iron pieces, allowing for a compact design and enhanced magnetic attraction force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the electromagnet, auxiliary yoke, permanent magnet, and movable iron piece are stacked and aligned on the same axis, then the magnetic attraction force is sufficient, but the overall dimension of the relay becomes larger
Solution Approach 1:
The patent transitions from a one-dimensional stacked alignment to a two-dimensional planar arrangement. The fixed iron core is configured in a substantially C-shape with magnetic pole pieces extending in opposite directions, and the movable iron piece is positioned between these pole pieces in the same plane rather than stacked along the same axis. This dimensional change allows sufficient magnetic attraction force while reducing the overall dimension of the relay.
2Device complexity
If the conventional stacked structure is used, then the assembly is simple, but the relay is prone to improper contact switching under mechanical vibrations or impacts
Solution Approach 1:
By arranging the magnetic components in a planar C-shaped configuration rather than a stacked arrangement, the patent creates a more stable magnetic circuit that is less sensitive to mechanical vibrations and impacts. The C-shaped fixed iron core with pole pieces extending in opposite directions provides better mechanical stability and contact reliability while maintaining assembly simplicity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration maintains the magnetic attraction force while reducing the overall size of the latching relay, improving stability against vibrations and impacts by increasing the contact area and retention force.
Implementation Method 1
an electromagnet portion 110, a movable iron piece portion 120... The electromagnet portion 110 comprises a substantially U-shaped fixed iron core 111, a coil bobbin 112 insert molded integrally with the fixed iron core 111, an exciting coil 113 wound around the coil bobbin 112
Implementation Method 2
a condition in which the movable iron piece is attracted to the magnetic pole surface of the fixed iron core is maintained by the magnetic force of the permanent magnet when the energization of the exciting coil is stopped to non-excite the electromagnet, thereby retaining a switched state of the electrical contacts
Data Source
AI summary
A latching relay has a fixed iron core including an exciting coil wound around an intermediate portion and a magnetic pole piece at two ends; movable iron pieces sandwiching a permanent magnet between two bar-shaped iron pieces disposed in parallel with each other, and are fixed with a holder; and a switchable electrical contact portion. The fixed iron core and the movable iron pieces are disposed facing each other to insert each of the magnetic pole pieces on two sides of the fixed iron core to be spaced apart in a space between the two bar-shaped iron pieces of two end portions of the movable iron pieces. The movable iron pieces are supported pivotally in a direction in which the two bar-shaped iron pieces are aligned. The movable iron pieces are linked to the electrical contact portion, and the movable iron pieces perform a switching of the electrical contact portion.