Motor Drive Apparatus Radial Component Layout
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Solution Overview
Problem
Conventional electric power steering (EPS) systems face challenges in achieving a compact design due to the large physical configuration of semiconductor modules and capacitors required for torque generation and surge voltage protection, which occupies excessive space in vehicles.
Innovation Solution
A drive apparatus with a built-in electronic control unit where semiconductor modules and capacitors are strategically placed on a heat sink, overlapping in the centerline direction to minimize axial space, and capacitors are connected in parallel for surge protection, allowing for a more compact radial design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If semiconductor modules and capacitors are disposed in an axial direction of the motor, then the motor can provide sufficient torque, but the physical configuration in the axial direction gets larger
Solution Approach 1:
The patent transitions from axial arrangement to radial arrangement of semiconductor modules and capacitors. The semiconductor modules are disposed around the stator in the radial direction, and capacitors are placed in the radial space between the semiconductor modules and the motor case, changing the dimensional organization from axial (1D) to radial (2D/3D spatial distribution) to reduce axial length while maintaining power capabilities
2Length of moving object
If semiconductor modules are disposed around a stator, then the physical configuration in the axial direction is small, but the physical configuration in a radial direction gets larger
Solution Approach 1:
The patent implements nested arrangement where capacitors are positioned within the radial space already occupied by the semiconductor module arrangement. Specifically, capacitors are disposed in the radial direction between the semiconductor modules and the motor case, effectively nesting components within available spatial envelopes to minimize overall radial length
3Use of energy by moving object
If a brushless motor is used for torque generation, then the EPS system provides low fuel consumption, but it requires an electronic control unit with semiconductor modules that increase device complexity
Solution Approach 1:
The patent merges the electronic control unit components (semiconductor modules and capacitors) directly into the motor structure. The semiconductor modules are disposed around the stator and the capacitors are integrated in the radial space within the motor case, combining what were previously separate components into a unified motor-ECU assembly, thereby reducing overall system 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
This configuration results in a smaller physical footprint for the drive apparatus, enabling more efficient use of space within vehicles while maintaining effective surge voltage protection and torque generation capabilities.
Implementation Method 1
The heat sink is extended in the same direction as the center line direction of the shaft from an end wall of the motor case... placed longitudinally to be directly or indirectly in contact with a side wall surface of the heat sink
Data Source
AI summary
An electronic control unit (50, 70) including semiconductor modules (501 to 506) and capacitors (701 to 706) is disposed in the axial direction of a motor (30). The semiconductor modules (501 to 506) are placed longitudinally and brought into contact with a heat sink (601). The vertical line to each of surfaces of semiconductor chips included in the semiconductor modules (501 to 506) is perpendicular to the axial line of the motor (30). Accordingly, the capacitors (701 to 706) are disposed so that at least a part of the capacitors (701 to 706) overlap the semiconductor modules (501 to 506) and heat sink (601) in the axial direction of the motor (30).