Motor Resolver Shield Layout for Compact Vehicle Drive Units
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Solution Overview
Problem
The spatial arrangement of the rotor, resolver, and drive gear in existing vehicle drive systems can cause interference with the shielding member, making it difficult to secure space for the shielding member and effectively suppress leakage magnetic flux from the motor, especially when the case is shortened in the axial direction.
Innovation Solution
A shielding member is positioned to extend radially between the stator coil and rotor, with notches to avoid interference with bearings and gears, and is fastened to the case to prevent leakage magnetic flux from reaching the resolver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the shielding member is disposed to extend radially in the space between the stator coil and rotor to suppress leakage magnetic flux, then the leakage magnetic flux suppression is improved, but interference with bearing parts or gears occurs
Solution Approach 1:
The shielding member is divided into multiple shielding plates (first shielding plate and second shielding plate) arranged at different radial positions. The first shielding plate extends radially outward from the rotor, and the second shielding plate extends radially inward from the first shielding plate, creating segmented zones that suppress leakage magnetic flux while avoiding interference with bearing parts and gears
Solution Approach 2:
The shielding member transitions from a simple radial extension to a multi-dimensional structure with plates positioned at different radial depths. This dimensional arrangement allows the shielding function to be distributed across multiple spatial layers, enabling effective magnetic flux suppression without interfering with components at specific radial positions
2Length of moving object
If the case is shortened in the axial direction to reduce overall size, then the compactness is improved, but space for the shielding member becomes insufficient
Solution Approach 1:
The shielding member utilizes the radial dimension extensively rather than requiring additional axial space. By arranging shielding plates at different radial positions from the rotor, the design achieves effective leakage magnetic flux suppression within the constrained axial length of the compact case
3Length of moving object
If the bearing fixing part approaches the motor in the axial direction to improve compactness, then the case size is reduced, but interference with the shielding member increases
Solution Approach 1:
The shielding member is segmented into multiple plates positioned at different radial locations. This segmentation allows the bearing fixing part to approach the motor axially without interfering with the shielding function, as each shielding plate operates independently at its specific radial position
Solution Approach 2:
Different portions of the shielding member have different radial extensions tailored to their specific functions. The first shielding plate extends radially outward to suppress leakage flux near the stator coil, while the second shielding plate extends radially inward to protect the rotor area, allowing local optimization that accommodates the bearing fixing part
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 effectively suppresses leakage magnetic flux to the resolver while avoiding interference with other components, maintaining a compact case design and ensuring accurate detection of the motor's rotation state.
Implementation Method 1
a shielding member which suppresses leakage magnetic flux discharging from the motor to the resolver
Data Source
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AI summary
A vehicle drive system is provided, which includes a shaft, a motor which rotates the shaft, a resolver which detects a rotation state of the motor, a shielding member which suppresses leakage magnetic flux discharging from the motor to the resolver, and a case which accommodates the shaft, the motor, and the resolver. The shielding member is disposed so that the shielding member extends in a radial direction of the shaft in a space between a gap that is formed between a stator coil and a rotor of the motor, and the resolver. A notch is formed radially outward of the shielding member to avoid interference with one of a bearing part and a gear provided inside the case.