Motor Resolver Shielding Layout for Leakage Flux Suppression
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Solution Overview
Problem
Leakage magnetic flux from the motor gap adversely affects the resolver in existing vehicle drive systems, particularly when the resolver is positioned close to the stator coil and rotor gap.
Innovation Solution
A shielding member made of nonmagnetic material is integrated into the vehicle drive system, comprising a first shielding plate extending radially and a second shielding plate approaching the rotor, to suppress leakage magnetic flux from reaching the resolver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolver is positioned close to the motor gap to improve detection accuracy, then measurement precision is improved, but leakage magnetic flux adversely affects the resolver
Solution Approach 1:
A shielding member made of nonmagnetic material is introduced as an intermediary between the motor gap and the resolver. This shielding member includes a first shielding plate disposed in the space between the gap and the resolver rotor, and a second shielding plate extending toward the rotor, creating a physical barrier that blocks leakage magnetic flux from reaching the resolver while allowing the resolver to maintain its close positioning for accurate detection
2Device complexity
If the resolver outer diameter is reduced to fit inside the motor coil end, then device complexity is reduced, but leakage magnetic flux interference increases
Solution Approach 1:
The shielding member serves as a mediator that enables the resolver to be positioned close to the motor gap without suffering from leakage magnetic flux interference. The first shielding plate blocks flux from the gap side, while the second shielding plate extends toward the rotor to provide additional protection, allowing the resolver to maintain a compact design
3Object-affected harmful factors
If the first shielding plate extends radially outward beyond the gap, then shielding effectiveness is improved, but device complexity increases
Solution Approach 1:
The shielding member is segmented into two distinct shielding plates with different functions: the first shielding plate extends radially outward beyond the gap to block leakage flux from reaching the resolver, while the second shielding plate extends toward the rotor to provide additional protection. This segmentation allows each plate to be optimized for its specific shielding function while maintaining overall system compactness
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 shielding member effectively reduces the adverse effects of leakage magnetic flux on the resolver, maintaining accurate detection of motor rotation states while minimizing interference with other components.
Implementation Method 1
a shielding member made of a nonmagnetic material 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, and a shielding member made of a nonmagnetic material which suppresses leakage magnetic flux from the motor discharging to the resolver. The resolver includes a resolver stator extending to a vicinity of a gap formed between a stator coil and a rotor of the motor, and a resolver rotor which rotates with the rotor of the motor. The shielding member includes a first shielding plate disposed in a space between the gap and the resolver rotor so that the first shielding plate extends in the radial direction of the shaft, and a second shielding plate extending in a direction approaching the rotor of the motor from the first shielding plate.