Brushless Motor Resolver Placement for Cable Routing
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Solution Overview
Problem
The complexity in routing cables for rotation angle detection units in brushless motors, as described in existing vehicle steering systems, leads to inconvenient and complex wiring arrangements due to the separate placement of resolvers on either side of the steering shaft.
Innovation Solution
A brushless motor design where the first and second motor units share a common rotary shaft, with the rotation angle detection units arranged within the first motor unit, allowing cables to be concentrated on one side and facilitating easier routing and phase adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotation angle detection units are arranged on both sides of the rotary shaft in separate motor units, then each motor unit can independently detect rotation angles, but cable routing becomes complex and wiring becomes inconvenient
Solution Approach 1:
The patent merges the second rotation angle detection unit from the second motor unit into the first motor unit. Specifically, the second rotation angle detection unit is arranged in the first motor unit alongside the first rotation angle detection unit, allowing both detection units to share the same housing space. This consolidation eliminates the need for separate cable routing on both sides of the rotary shaft, simplifying the overall wiring arrangement while maintaining independent rotation angle detection capabilities for both motor units.
2Reliability
If rotation angle detection units are arranged on both sides of the rotary shaft, then each motor unit has its own detection unit, but the wiring arrangement becomes inconvenient and complex
Solution Approach 1:
The patent consolidates both rotation angle detection units within the first motor unit's housing. The second rotation angle detection unit is positioned in the first motor unit rather than in the second motor unit, allowing cables from both detection units to be routed through a single convenient location. This arrangement significantly improves wiring convenience while preserving the functional independence of rotation angle detection for both motor units.
3Adaptability or versatility
If rotation angle detection units are placed in separate motor units on opposite sides, then each unit is self-contained, but cable routing becomes complicated
Solution Approach 1:
The patent combines the location of both rotation angle detection units within the first motor unit while maintaining their functional independence. The first rotation angle detection unit detects the rotation angle of the first motor unit, and the second rotation angle detection unit detects the rotation angle of the second motor unit. Both units are housed together in the first motor unit, which simplifies cable routing by allowing both cables to exit from the same side, thereby reducing cable arrangement complexity without compromising motor unit independence.
Data Source
AI summary
A brushless motor includes a first motor unit and a second motor unit having a common rotary shaft and coupled to each other in an axial direction in which the rotary shaft extends, and two resolvers configured to respectively detect a rotation angle of the first motor unit and a rotation angle of the second motor unit. The two resolvers are arranged in the first motor unit.