Parallel Magnetic Circuit Latching Relay for Balanced Voltage
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Solution Overview
Problem
Magnetic latching relays with series-type magnetic circuits face issues such as poor load capability and impact resistance due to strong permanent magnet attraction forces, requiring large reset forces and voltage imbalances between setting and resetting voltages.
Innovation Solution
A magnetic latching relay with a parallel-type magnetic circuit featuring two parallel permanent magnetic paths, a magnetic isolation recess on the iron yoke, and a cut on the pole shoe of the iron core, which adjusts retention forces and balances voltage magnitudes, along with improved coil and spring structures to enhance creepage distance and impact resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a series-type magnetic circuit with a permanent magnet is used, then the armature can be kept in the attracted state, but the pressure on the contact point at a normal-close terminal is relatively small, resulting in poor load capability and resistance against impact and vibration
Solution Approach 1:
The magnetic circuit is segmented into two parallel paths: one path through the iron core and armature, and another path through the magnetic conductor member. This segmentation allows the permanent magnet's magnetic flux to be distributed, enabling independent optimization of attraction force and contact pressure, thereby resolving the contradiction between maintaining armature attraction and ensuring sufficient contact point pressure for load capability.
Solution Approach 2:
The magnetic conductor member is positioned to create a localized magnetic path that does not pass through the armature-contact interface. This local quality adjustment allows the permanent magnet to provide strong attraction force through the iron core while simultaneously directing magnetic flux through the magnetic conductor member to generate adequate contact pressure at the normal-close terminal, improving load capability without compromising attraction stability.
2Ease of operation
If a series-type magnetic circuit with a permanent magnet is used, then the armature can be kept in the attracted state, but a large reset force is required to overcome the permanent magnet's attraction force, and the setting voltage and resetting voltage are unbalanced
Solution Approach 1:
By segmenting the magnetic circuit into parallel paths, the permanent magnet's flux is divided between the iron core path and the magnetic conductor member path. This reduces the total flux through the armature, thereby decreasing the permanent magnet's attraction force on the armature. Consequently, the reset force required to overcome this attraction is reduced, and the setting/resetting voltage balance is improved, making the relay easier to operate.
3Reliability
If the coil and iron core structure is improved to increase creepage distance, then electrical accidents caused by metal spatters can be prevented, but the device complexity increases
Solution Approach 1:
The magnetic conductor member is merged with the existing magnetic circuit components (iron yoke and iron core) to form an integrated parallel magnetic path. This merging approach achieves the dual function of increasing creepage distance to prevent electrical accidents and maintaining a relatively simple overall structure, as the magnetic conductor member utilizes the existing magnetic flux paths without requiring completely separate structural elements.
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
The parallel-type magnetic circuit design stabilizes state switching, balances setting and resetting voltages, improves impact resistance, and prevents electrical accidents by isolating contact points and collecting metal spatters, thus enhancing the overall performance of the relay.
Implementation Method 1
The permanent magnet 106 generates a permanent magnetic circuit which starts from an N pole of the permanent magnet, passes through the iron core 104, an air gap, the armature 102, the iron yoke 103, reaches an S pole of the permanent magnet
Implementation Method 2
the permanent magnet filed and the magnetic field generated by the coil is in the same direction, the magnetic forces will add to each other
Implementation Method 3
Upon excitation, the coil 105 generates a magnetic field which passes through the iron core 104, the air gap, the armature 102, the iron yoke 103 and the S-N of the permanent magnet
Implementation Method 4
the magnetic forces will add to each other to form a force which overcomes the counter force of the spring sheet 101, so as to cause the armature 102 and the iron core 104 to attract each other
Implementation Method 5
the permanent magnetic paths provide a force to maintain the air gap to be closed; the movable spring sheet provides a counter force to maintain the air gap to be opened
Data Source
AI summary
A magnetic latching relay of a parallel type magnetic circuit, forming two parallel permanent magnetic circuits on the permanent magnetic circuit of a relay; one of the permanent magnetic circuits is used to provide adequate attraction to an armature, so that permanent magnetic attraction can achieve a balance of applied forces with the counter-force provided by a movable spring, so as to realize relay bistability or state transition more stably.