Stator Shield Structure for Electric Pump EMI Reduction
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Solution Overview
Problem
Electric pumps generate electromagnetic interference that affects external components, necessitating a solution to reduce this interference.
Innovation Solution
The electric pump incorporates a stator assembly with a shield member made of conductive metal located on the outer circumference of the winding sections, which absorbs and reflects electromagnetic waves, thereby reducing interference with the external environment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a winding is energized in the stator assembly, then the electric pump generates electromagnetic waves for operation, but the electromagnetic waves interfere with other external components and affect their performance
Solution Approach 1:
A shield member made of conductive material is introduced as an intermediary between the winding and the external environment. The shield member absorbs and reflects electromagnetic waves generated by the winding, preventing them from interfering with external components while allowing the winding to function normally.
Solution Approach 2:
The shield member converts the harmful electromagnetic radiation into beneficial effects by absorbing and reflecting the waves. The electromagnetic energy that would otherwise cause interference is redirected or dissipated, protecting external components while maintaining the pump's operational electromagnetic field.
2Object-generated harmful factors
If a shield member is added to reduce electromagnetic interference, then the interference with external components is reduced, but the device complexity increases
Solution Approach 1:
The shield member is designed as a thin-walled cylindrical structure that can be easily manufactured and assembled. This thin-film approach provides effective electromagnetic shielding without adding significant structural complexity or volume to the pump assembly.
Solution Approach 2:
The shield member serves multiple functions: it shields against electromagnetic interference, provides structural support for the winding, and can be integrated with existing pump components. This multi-functionality reduces the need for additional separate shielding components, thereby limiting the increase in device complexity.
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 shield member effectively minimizes electromagnetic radiation to the external environment, reducing interference and potential noise from the electric pump.
Implementation Method 1
the shield member can absorb and reflect the electromagnetic waves generated by the winding during the use of the electric pump
Implementation Method 2
the shield member can absorb and reflect the electromagnetic waves generated by the winding during the use of the electric pump
Data Source
AI summary
An electric pump includes a stator assembly. The stator assembly includes a stator core and a winding. The winding includes a main body section, a first section, and a second section. The stator core includes a core tooth portion, a core yoke portion, and a core neck portion. A first reference plane is defined, which coincides with a center axis line of the core tooth portion in an axial direction thereof and a center axis line of the core neck portion in an axial direction thereof. In a cross section of the stator assembly along the first reference plane, an upper end of the main body section is level with an upper end of a main body portion of the core yoke portion, and a lower end of the main body section is level with a lower end of the main body portion of the core yoke portion.