Motor Sensor Routing via Axial Port Overlap
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Solution Overview
Problem
In integrated motor configurations, the long wires connecting the rotational position sensor and the control circuit are susceptible to disturbance noise, degrading the accuracy of the sensor due to their routing through the motor's circumferential wall.
Innovation Solution
A motor design featuring a coupling connector that connects the motor sensor and the control device, with the sensor housing part having a port that overlaps with the coupling connector in the axial direction, allowing for reduced wire length and minimizing noise susceptibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the wire is routed from the motor rotating shaft to the circumferential wall through the integrated motor structure, then the motor can be integrated with the control device, but the wire becomes longer and more susceptible to disturbance noise
Solution Approach 1:
The patent changes the routing dimension of the wire from a three-dimensional path through the motor structure to a two-dimensional planar path on the circuit board. The wire is extended along the circuit board in the radial direction from the rotating shaft vicinity to the circumferential wall, rather than routing it through the motor's internal volume. This dimensional change on the circuit board surface reduces the wire length and its exposure to disturbance noise while maintaining the integrated motor structure.
2Ease of operation
If the work window is provided in the circumferential wall for maintenance, then accessibility is improved, but the wire routing distance increases and noise susceptibility worsens
Solution Approach 1:
The patent merges the work window function with the wire routing path. The work window is provided in the circumferential wall not only for maintenance access but also serves as the exit point for the wire that is extended along the circuit board. This merging allows the wire to reach the circumferential wall through a shortened path on the circuit board, reducing its length and noise susceptibility while maintaining maintenance accessibility through the same work window.
3Measurement precision
If the wire length is reduced to minimize noise susceptibility, then measurement precision is improved, but the routing path becomes more constrained
Solution Approach 1:
The patent utilizes the circuit board's existing surface and structure as the routing path for the wire. The circuit board itself serves the dual function of electrical connection and mechanical routing guide. The wire is extended along the circuit board in the radial direction, using the board's own geometry to define the optimal path from the rotating shaft vicinity to the circumferential wall, thereby minimizing wire length and noise susceptibility without requiring additional complex routing structures.
Data Source
AI summary
An object of the present invention is to provide a motor which has a maintenance port and of which the wire is insusceptible to disturbance noise. The motor includes: a bracket housing a rotor and a stator; a control device housing part located on the radial direction outside of the bracket; a control device located inside the control device housing part; a sensor housing part located at the end of the bracket on the side opposite to an output end; a motor sensor mounted at the end of a rotating shaft on the side opposite to the output end; and a coupling connector connecting the motor sensor and the control device with each other. The control device housing part and the sensor housing part communicate with each other. The coupling connector is located inside the sensor housing part. The sensor housing part has a port which has an opening in the axial direction, and the port and the coupling connector at least partially overlap with each other in the axial direction.