Geared Motor Position Indicator Mounting for Signal Integrity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing manufacturing process for geared motors poses a risk of damaging the position indicator due to harsh conditions, and the position signal is often distorted by electromagnetic fields, especially when the indicator is mounted on the non-driven end of the electric motor.
Innovation Solution
The position indicator is mounted on the input shaft of the gearbox at a second side, away from the electric motor, allowing for easier access and reduced exposure to harsh conditions during manufacturing, and is positioned to minimize interference from electromagnetic fields, with a cap providing protection and enabling contactless sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the position indicator is mounted on the rotor shaft of the electric motor, then the angular position can be sensed, but the position indicator is exposed to harsh conditions during manufacturing and is at risk of damage
Solution Approach 1:
The position indicator is separated from the electric motor rotor shaft and mounted independently on the input shaft of the gearbox. This segmentation allows the position indicator to be installed after the motor-gearbox assembly is complete, avoiding exposure to harsh manufacturing conditions while maintaining angular position sensing capability.
Solution Approach 2:
The input shaft of the gearbox serves as an intermediary mounting location for the position indicator. By placing the position indicator on this intermediate component rather than directly on the motor rotor shaft, the system protects the fragile position indicator from damage during manufacturing while still enabling accurate angular position measurement.
2Ease of operation
If the position indicator is mounted on the non-driven end of the electric motor, then access is easier during assembly, but the position indicator is highly susceptible to damage from tool forces
Solution Approach 1:
The position indicator is extracted from the electric motor assembly and mounted on the gearbox input shaft instead. This removes the position indicator from the area where tool forces are applied during motor assembly, eliminating the risk of damage while maintaining accessibility for installation.
3Measurement precision
If the position indicator is mounted on the driven end of the electric motor, then the angular position can be sensed, but the position indicator becomes inaccessible after coupling the electric motor to the gearbox
Solution Approach 1:
By separating the position indicator mounting location from the electric motor housing area and placing it on the gearbox input shaft, the position indicator remains accessible after assembly. This segmentation allows maintenance and adjustment of the position indicator without disassembling the motor-gearbox coupling.
4Loss of information
If a cable is used to transmit the position signal from the position sensor to the power converter, then the signal can be transmitted, but the electromagnetic fields from the electric motor distort the signal
Solution Approach 1:
The position indicator and its sensing system are extracted from the electric motor's electromagnetic field environment by mounting them on the gearbox input shaft. This spatial separation reduces electromagnetic interference with the position signal, improving signal quality while maintaining transmission capability.
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
This configuration reduces the risk of damaging the position indicator during manufacturing and ensures a strong, clear position signal by isolating it from electromagnetic interference, allowing for reliable operation and improved manufacturing efficiency.
Implementation Method 1
the position indicator is mounted on the input shaft of the gearbox at a second side vis-à-vis of its first side
Implementation Method 2
the position indicator is covered by a cap, which seals the housing of the gearbox... a rotating magnetic field caused by a position indicator can be sensed in a contactless manner through the cap
Data Source
Figure 1~2
AI summary
A Geared motor (1) is proposed, which comprises a gearbox (2) with an input shaft (8), an electric motor (3) with a rotor (18), wherein the rotor (18) is coupled to or mounted on the input shaft (8) of the gearbox (2) at a first side of the input shaft (8), and a position indicator (21), which is designed to indicate an angular position of the rotor (18). In detail, the position indicator (21) is mounted on the input shaft (8) of the gearbox (2) at a second side vis-à-vis of its first side. Moreover, a geared a vehicle (27) with such a geared motor (1) are disclosed.