G-Rotor Pump Controller Integration for EMI Reduction
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Solution Overview
Problem
G-rotor pumps in motor vehicle applications face challenges with electromagnetic interference (EMI) due to electrical cabling acting as an antenna, and there is a need for a more compact pump assembly that integrates the electric motor and controller to minimize EMI and reduce cabling length.
Innovation Solution
The G-rotor pump assembly integrates the electric motor and controller within a single housing unit, with the controller's circuit board positioned axially aligned with the motor and encapsulated by a lower cover, reducing EMI interference and enabling a compact design by minimizing the length of electrical cabling needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the controller is positioned remotely from the electric motor, then the circuit board can be easily manufactured and assembled, but electrical cabling acts as an antenna to pick up EMI and interfere with motor operation
Solution Approach 1:
The controller is integrated within the pump housing in close proximity to the electric motor, merging previously separate components. This eliminates long electrical cabling that acted as EMI antennas, while the controller remains independently manufacturable and assembleable within the housing structure.
2Ease of manufacture
If the controller is positioned remotely from the electric motor, then manufacturing and assembly are easier, but the overall pump assembly size increases
Solution Approach 1:
The controller is nested within the pump housing structure, utilizing the existing housing volume efficiently. The controller fits within the housing alongside the motor and pump components, eliminating the need for additional external space that would be required for a remotely mounted controller.
3Ease of operation
If electrical cabling is used to connect the remote controller to the motor, then the controller can be positioned for ease of assembly, but the cabling picks up EMI and causes operational interference
Solution Approach 1:
The harmful electrical cabling is extracted from the system by positioning the controller directly within the housing near the motor. This eliminates the cabling that generated EMI, while the controller maintains ease of operation through direct integration with the motor mounting structure.
Data Source
AI summary
A G-rotor pump assembly is disclosed. The assembly makes use of a housing having a pump/motor housing portion and a laterally projecting housing portion. An electric motor is disposed within the pump/motor housing portion. A controller has a circuit board with a portion which is positioned within the pump/motor housing portion so as to be generally axially aligned with the electric motor and in proximity to the electric motor. A lower cover is configured to engage with the housing to encapsulate the controller and the electric motor within the housing.