Inductive Energy Transmission Device with Segmented Magnetic Cores
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Solution Overview
Problem
Existing contactless inductive energy transmission devices for displacement systems suffer from low energy transmission efficiency and increased mass, which affects the dynamics of the displacement device, due to segmented primary cores and large air gaps, leading to mechanical disturbances and reduced magnetic coupling.
Innovation Solution
A contactless inductive energy transmission device with a magnetic circuit featuring E-shaped primary and secondary cores, where the primary core has a continuous central limb gap and the secondary core has a gap over its entire length, both made of magnetically conductive materials, reducing eddy current losses and allowing for larger magnetic coupling and power transmission with reduced secondary core length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the primary core is segmented with filler segments to reduce self-induction, then self-induction is reduced, but the overall transferable energy is limited and the secondary core length must increase
Solution Approach 1:
The primary core is segmented into multiple magnetically conductive core sections along its longitudinal axis, with air gaps between them. This segmentation reduces self-induction while maintaining magnetic coupling for energy transfer, eliminating the need for filler segments and allowing continuous magnetic flux paths.
Solution Approach 2:
Air gaps serve as intermediaries between the magnetically conductive core sections, replacing the need for non-magnetic filler segments. These air gaps allow magnetic flux to pass through while physically separating the core sections, reducing self-induction without blocking energy transfer.
2Loss of energy
If the secondary core length is increased to achieve desired reduction in self-induction, then self-induction is reduced, but the total moving mass increases affecting dynamics
Solution Approach 1:
The secondary core is segmented into multiple magnetically conductive sections with air gaps between them, replacing the need for long continuous cores or filler segments. This reduces the overall length and mass of the secondary core while maintaining effective energy transfer through the air gaps.
3Ease of operation
If a large air gap is formed between E-profile rails, then mechanical movement is enabled, but the magnetic field is weakened requiring larger magnets
Solution Approach 1:
The air gap is segmented into multiple smaller gaps between magnetically conductive core sections, rather than one large continuous gap. This maintains magnetic field strength across each smaller gap while allowing mechanical movement, eliminating the need for oversized magnets.
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 achieves higher energy transmission efficiency and improved dynamic properties by minimizing eddy current losses, maintaining electromagnetic compatibility, and enabling the transmission of kilowatt-range powers with reduced moving mass, comparable to static solutions.
Implementation Method 1
contactless, inductive transmission of electrical energy from a first, preferably stationary, system of a displacement device to a second, movable system of the displacement device
Implementation Method 2
The primary core has a continuous central limb gap and the secondary core has a gap over its entire length, both made of magnetically conductive materials, reducing eddy current losses
Data Source
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AI summary
The present invention relates to a device (1) for the contactless inductive transmission of electrical energy from a first, preferably stationary, system of a displacement device to a second, movable system of the displacement device, comprising a magnetic circuit consisting of a primary core (10) associated with the first system, on which a primary coil is wound, and a secondary core (20) associated with the second system, on which a secondary coil is wound. The secondary core (20) is displaceably arranged relative to the primary core (10) along a displacement path (X), which preferably runs parallel to a displacement path of the displacement device. The primary core (10) extends at least over the entire length (L) of the displacement path. According to the invention, the primary core (10) comprises at least one primary core gap (30a) extending over the entire longitudinal extent (L10) of the primary core (10).The invention further relates to a displacement device, in particular a linear displacement device, with such an energy transmission device (1) and a method for operating such a device (1).