Electromagnetic Contactor Switching Element for Defined Tilting
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Solution Overview
Problem
Electromagnetic contactors with pure AC control fail to achieve defined tilting behavior according to the NFC63-110 standard, leading to potential sticking of the magnet system and undefined switch-on thresholds, which increases costs when control electronics are required to meet standards.
Innovation Solution
Incorporating a switching element, such as a thyristor, triac, transistor, or relay, in front of the magnetic coil to control voltage application, ensuring only defined voltage values reach the coil, preventing chattering and contact welding, and optimizing energy usage by switching off below thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pure AC control is used with laminated E-magnet systems, then cost is reduced by using standard drives, but the device fails to achieve defined tilting behavior according to NFC63-110 standard and may cause the magnet system to get stuck
Solution Approach 1:
The patent changes the electrical parameters by introducing a switching element that converts pure AC control to controlled DC/UC operation. The switching element (thyristor, triac, transistor, or relay) enables the magnetic coil to receive controlled voltage with defined polarity, transforming the control mode from standard AC to a modified DC/UC operation that achieves the required tilting behavior while maintaining cost-effectiveness through the use of standard iron circuit components
2Reliability
If control electronics are added to achieve defined tilting behavior according to NFC63-110 standard, then reliability is improved, but cost increases considerably
Solution Approach 1:
The patent extracts the essential control function from complex electronic control systems and implements it through a simpler switching element placed directly in series with the magnetic coil. This switching element (thyristor, triac, transistor, or relay) performs the critical function of controlling voltage application and defining the tilting behavior without requiring additional control electronics, thereby achieving the required reliability at lower cost
Solution Approach 2:
The switching element acts as an intermediary between the AC voltage source and the magnetic coil, mediating the voltage application to achieve defined tilting behavior. The switching element converts the AC control signal into controlled voltage application to the coil, enabling the magnet system to exhibit the required tilting characteristic without complex control electronics
3Ease of operation
If AC voltage is applied to the coil without a switch-on threshold, then the magnet system may start moving when energy is high enough, but the magnet system runs against the main contact spring and may get stuck
Solution Approach 1:
The switching element performs a preliminary action by controlling when voltage is applied to the magnetic coil. It ensures that voltage is only applied when the switching element conducts, creating a defined switch-on threshold. This preliminary control of voltage application prevents the magnet system from moving against the main contact spring and getting stuck, ensuring reliable switching operation
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 solution enables a defined breakover behavior, avoiding chattering and contact welding, while ensuring no energy consumption below switch-on or switch-off thresholds, thus meeting the NFC63-110 standard without the need for costly control electronics.
Implementation Method 1
a magnetic coil are arranged between the armature and the yoke
Implementation Method 2
an armature return spring and a magnetic coil being arranged between the armature and the yoke
Data Source
AI summary
The invention relates to an electromagnetic contactor, comprising fixed and movable contacts, which are fixed on a contact carrier, which is coupled to a movable armature, which is arranged opposite a yoke, wherein an armature restoring spring and a magnetic coil (2) are arranged between the armature and the yoke. The invention is characterized in that a switch (3) having a switching element (6) is arranged before the magnetic coil (2).