Electric Pump Coil Guide Layout Without Bus Bars
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Solution Overview
Problem
Conventional electric pumps require space for bus bars between the stator and control unit, leading to increased size due to the need for arranging these components.
Innovation Solution
The electric pump design incorporates a coil guide system that eliminates the need for bus bars by guiding and connecting coil wires directly from the stator to a circuit board, using a first coil guide portion that holds the coil wire along the axial direction and a second inclined coil guide portion that facilitates easy insertion and secure connection, reducing the overall size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a bus bar is arranged between the stator and control unit to connect coil wires, then electrical connection is achieved, but the axial space requirement increases leading to larger pump size
Solution Approach 1:
The invention extracts and eliminates the bus bar component from the system by directly connecting coil wires from the stator to the circuit board. This removal of the intermediate bus bar component reduces the axial space requirement and simplifies the overall component arrangement, directly resolving the technical contradiction between pump size and component arrangement complexity
Solution Approach 2:
The invention changes the spatial arrangement by having coil wires extend in the radial direction from the stator to the circuit board, rather than requiring axial space for bus bars. This dimensional change in wire routing allows electrical connection without increasing axial dimensions, thereby reducing pump size while maintaining connection functionality
2Ease of manufacture
If bus bars are used for electrical connection, then reliable electrical connection is achieved, but additional components and connection points are required increasing assembly complexity
Solution Approach 1:
The invention removes the bus bar component entirely from the system, eliminating the need for separate bus bar installation and connection processes. This extraction simplifies manufacturing by reducing the number of components and assembly steps, directly improving ease of manufacture while reducing device complexity
Solution Approach 2:
The invention merges the electrical connection function directly into the circuit board by having coil wires connect directly to connection terminals on the circuit board. This consolidation eliminates the need for separate bus bar components and their associated assembly operations, thereby simplifying manufacturing and reducing component count
Data Source
AI summary
An electric pump includes a motor including a rotor rotatable about an axis extending in an axial direction and a stator with a coil wire, a pump connected to the rotor, a circuit board on a first side in the axial direction of the motor, and a coil guide between the motor and the circuit board. The coil wire extends to the first side in the axial direction and is connected to the circuit board. The coil guide includes a first portion guiding the coil wire along the axial direction, and a second portion which faces the motor and in which the first portion is opened. The second portion is a surface inclined to the first side in the axial direction toward an opening of the first portion. A width of the second portion as viewed from the axial direction decreases toward the opening of the first portion.