AC Contactor Coil Winding for Compact Motor Relay
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Solution Overview
Problem
Existing motor protection relays require a separate transformer for voltage supply, leading to increased space requirements and costs, making it difficult to achieve a compact design.
Innovation Solution
The circuit arrangement for an AC contactor includes an excitation coil with a second winding that acts as a voltage supply, forming a transformer with the first winding to provide power to the electrical consumer during control current flow, allowing for a compact design while saving costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate transformer is provided for voltage supply to measurement electronics, then the electronics can be supplied with operating voltage, but the space requirement increases and costs increase
Solution Approach 1:
The patent combines the voltage supply function with the existing excitation coil by adding a second winding to it. The excitation coil now serves dual purposes: generating magnetic field for contactor operation (first winding) and transforming voltage for electronics supply (second winding). This eliminates the need for a separate transformer, reducing space and cost while maintaining reliable voltage supply to the electronics.
Solution Approach 2:
The excitation coil is designed with multiple windings to perform multiple functions simultaneously. The first winding generates the magnetic field needed for contactor operation, while the second winding transforms the voltage to supply the measurement electronics. This multi-functional design eliminates the separate transformer component.
2Reliability
If a separate transformer is provided for voltage supply, then the electronics can be supplied with operating voltage, but the costs increase
Solution Approach 1:
The patent merges the voltage transformation function into the existing excitation coil structure by adding a second winding. This eliminates the need for a separate transformer component, reducing part count, assembly complexity, and overall manufacturing cost while ensuring continuous voltage supply to the electronics.
Solution Approach 2:
The excitation coil with multiple windings serves multiple functions: the first winding creates the magnetic field for contactor operation, while the second winding provides voltage transformation for the electronics. This multi-functionality reduces component count and manufacturing costs.
3Productivity
If the second winding is used for voltage supply during control current flow, then power is available precisely when needed, but the electrical consumer must be switched off under certain conditions
Solution Approach 1:
The patent incorporates an electronic circuit that monitors system parameters and provides feedback control. When specified parameters are reached or after a certain time has elapsed, the circuit automatically interrupts the connection of the first winding to the AC power source, switching off the load circuit and the electrical consumer. This feedback mechanism ensures safe operation while maintaining power availability during normal operation.
Solution Approach 2:
The system operates in periodic cycles: during normal operation, the control circuit receives AC voltage and the second winding supplies power to the electrical consumer; when specified conditions are met, the circuit automatically interrupts power and switches off the consumer. This periodic on-off operation ensures both productivity and safety.
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 solution enables a compact and cost-effective design for motor protection relays by using the excitation coil's second winding to supply voltage, ensuring power is available only when needed, thereby reducing space and cost requirements.
Implementation Method 1
the first winding (1) with the core (10) generates a magnetic field
Implementation Method 2
The second winding (2) on the excitation coil (3) forms a transformer with the first winding (1) on the common coil core (10), so that the consumer (4) is supplied with a correspondingly induced alternating current
Data Source
AI summary
The invention relates to a circuit assembly for an alternating current contactor comprising an excitation coil, wherein the excitation coil comprises at least one first winding for generating a pick-up and/or release current, to a motor protection relay comprising such a circuit assembly, and to a method for producing a power supply unit of an electric load, wherein an excitation coil of an alternating current contactor comprising at least one first winding for generating a pick-up and/or release current is used.