Motor Position Sensor Mounting for Compact Bearing Shield Layout
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Solution Overview
Problem
Existing motor designs face challenges in compactness and efficient use of installation space for sensor components, leading to increased volume and potential interference between electronic sensors and metal bearing brackets.
Innovation Solution
A motor assembly with a sensor arrangement where the sensor is mounted on a bearing bracket using an insulating disk, allowing for a compact design by sharing the mounting space with the rotor shaft, and a target on the rotor is fixedly connected to prevent positional offset during rotation, utilizing an inductive measurement principle for precise rotor position determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sensor is mounted on a separate mounting structure, then the sensor positioning is stable and reliable, but the motor volume increases and installation space is wasted
Solution Approach 1:
The patent combines the sensor mounting function with the existing bearing bracket structure. The bearing bracket, which already supports the rotor shaft, is designed to also accommodate the sensor through a sensor receiving structure, eliminating the need for separate mounting structures and reducing overall motor volume while maintaining stable sensor positioning
Solution Approach 2:
The bearing bracket is designed with multi-functionality, serving both as a structural support for the rotor shaft and as a mounting platform for the sensor. The sensor receiving structure integrated into the bearing bracket allows the same component to fulfill multiple functions, optimizing space utilization
2Length of moving object
If the sensor is mounted close to the bearing bracket, then the motor length is reduced, but electrical interference may occur between sensor electronics and metal bearing bracket
Solution Approach 1:
The patent introduces an insulating component as an intermediary between the sensor electronics and the metal bearing bracket. This insulating structure prevents electrical interference while allowing the sensor to be mounted in close proximity to the bearing bracket, thereby reducing motor length without compromising electrical isolation
Solution Approach 2:
The sensor receiving structure incorporates insulating materials that act as thin film barriers between the electronic components of the sensor and the conductive bearing bracket. This insulation layer prevents harmful electrical interference while maintaining the compact mounting arrangement
3Ease of operation
If the target is not firmly connected to the rotor, then the target can rotate freely, but positional offset occurs during rotation leading to measurement errors
Solution Approach 1:
The patent implements a firm connection between the target and the rotor before rotation begins. The target is securely attached to the rotor surface, ensuring that the target rotates exactly with the rotor without any relative movement or offset, thereby preventing measurement errors while maintaining the necessary rotational freedom
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 enables a compact motor design with reliable rotor position sensing, reducing overall length and volume, while ensuring no interference between sensor electronics and the bearing bracket, and preventing measurement errors due to rotor-target offset.
Implementation Method 1
the sensor is mounted on the bearing bracket by means of an insulating disk. By means of the insulating disk it is ensured that, in the case of a metal bearing bracket, no interference occurs between the electronics of the sensor and the bearing bracket
Implementation Method 2
utilizing an inductive measurement principle for precise rotor position determination
Data Source
AI summary
A motor assembly includes a rotor and a sensor arrangement. The sensor arrangement has a sensor and a target. The target is applied to a surface of the rotor and the sensor is mounted on a bearing shield of the motor opposite the target.