Ignition Coil Magnet Biasing to Reduce Energy Loss
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Solution Overview
Problem
Existing ignition coils experience energy loss when primary energy is transformed into secondary energy due to the opposition between magnet-magnetomotive force and coil-magnetomotive force, leading to inefficient magnetic flux generation and energy conversion.
Innovation Solution
The ignition coil design includes a magnet with magnetization vectors inclined relative to the gap direction, allowing the coil-magnetomotive force to exceed the magnet-magnetomotive force quickly, thereby minimizing energy loss and maximizing magnetic flux generation and secondary energy production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a magnet is disposed in the air gap between the center core and outer peripheral core to magnetically bias the closed magnetic path, then secondary voltage and secondary energy are enhanced, but energy loss increases during transformation of primary energy to secondary energy
Solution Approach 1:
The magnetization vectors of the magnet are inclined at a specific angle (45 degrees) relative to the gap direction, changing the magnetic field orientation parameter. This inclination allows the coil-magnetomotive force to exceed the magnet-magnetomotive force more quickly, reducing the time period where primary energy is lost without generating magnetic flux, while still maintaining the magnetic bias needed for high secondary voltage.
2Quantity of substance
If the magnet-magnetomotive force is larger than the coil-magnetomotive force immediately after primary coil energization, then magnetic flux is generated in the core, but primary current increases rapidly causing energy loss
Solution Approach 1:
By inclining the magnetization vectors at 45 degrees, the component of magnet-magnetomotive force opposing the coil-magnetomotive force is reduced. This parameter change allows magnetic flux to be generated while controlling the rate of primary current increase, minimizing energy loss during the energization phase.
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 design minimizes energy loss during the transformation of primary energy into secondary energy, enhancing the efficiency of magnetic flux generation and secondary energy production, and allows for the use of less expensive magnet materials while reducing thermal energy generation.
Implementation Method 1
a magnet disposed in an air gap between the center core and the outer peripheral core in an axial direction of windings of the primary and secondary coils. The magnet is used to magnetically bias the closed magnetic path
Implementation Method 2
The ignition coil works to block supply of electrical current to the primary coil to change an amount of magnetic flux in the closed magnetic path, thereby inducing a secondary high voltage at the secondary coil
Data Source
AI summary
An ignition coil for use in an internal combustion engine includes a primary coil, a secondary coil, a core, and a magnet. The core creates a closed magnetic circuit through which magnetic flux produced upon energization of the primary coil flows. The core has formed therein a gap through which the magnetic circuit passes. The magnet is disposed in the gap and has magnetic domains whose magnetization vectors are at least partially oriented obliquely relative to a gap direction. The orientation of the magnetization vectors in the magnet minimizes an energy loss when primary energy is transformed into secondary energy.