Vehicle Drive Shielding Layout for Resolver Flux Isolation
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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 suppress leakage magnetic flux from the motor, then the magnetic flux suppression effectiveness is improved, but interference with gears and bearings occurs
Solution Approach 1:
The shielding member is divided into multiple shielding plates (first shielding plate and second shielding plate) with different orientations. The first shielding plate extends radially to block magnetic flux, while the second shielding plate extends axially to avoid interfering with the gear and bearing, creating a segmented structure that fulfills multiple functions simultaneously
Solution Approach 2:
Different portions of the shielding member have different structural characteristics - the first shielding plate provides radial shielding coverage, while the second shielding plate provides axial clearance. This local differentiation allows the shielding member to suppress magnetic flux effectively in critical areas while avoiding interference zones
2Length of moving object
If the case size is shortened in the axial direction, then the compactness is improved, but space for the shielding member becomes insufficient
Solution Approach 1:
The shielding member utilizes both radial and axial dimensions through its dual-plate structure. The first shielding plate extends radially to provide shielding coverage, while the second shielding plate extends axially to adapt to the shortened case configuration, effectively using multiple spatial dimensions to resolve the space constraint
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, ensuring reliable operation and compact design of the vehicle drive system.
Implementation Method 1
a shielding member which suppresses leakage magnetic flux discharging from the motor to the resolver
Data Source
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.