Rotary Encoder Arrangement in Cable Winch Motor
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Solution Overview
Problem
Existing cable winch systems lack a compact and easily maintainable arrangement for rotary encoders to determine the rotational speed of electric drive motors and transmissions, leading to increased construction size and complexity in assembly and maintenance.
Innovation Solution
A rotary encoder is arranged between the electric drive motor and the transmission, utilizing a flat, annular disk with uniformly spaced windows scanned by a Hall sensor, which is housed in a coupling space defined by the transmission and motor, allowing for a space-saving and protected installation that simplifies assembly and maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the rotary encoder is arranged outside the transmission housing, then assembly and maintenance are simplified, but the encoder is exposed to environmental influences
Solution Approach 1:
The rotary encoder is nested within the transmission housing structure, specifically utilizing the coupling space between the drive motor and transmission. The encoder disk is mounted on the input shaft inside the housing, while the sensor is accessible through an opening in the housing wall, combining protection with accessibility.
Solution Approach 2:
The housing wall acts as an intermediary structure that provides both protection and accessibility. A sensor opening is created in the housing wall, allowing the sensor to scan the encoder disk while remaining protected within the housing structure.
2Ease of manufacture
If the rotary encoder components are distributed separately, then assembly is simplified, but the radial construction size increases
Solution Approach 1:
The encoder disk and sensor are merged into a single functional unit housed within the coupling space. The disk is mounted on the input shaft and the sensor is positioned to scan the disk's edge, creating a compact integrated arrangement that minimizes radial space requirements.
Solution Approach 2:
The encoder signal is tapped axially rather than radially. The sensor scans the edge of the rotating disk and detects signals in the axial direction, perpendicular to the disk rotation plane, which reduces the radial space required for the encoder components.
3Ease of repair
If the sensor is accessible from outside the housing, then maintenance is easier, but the encoder arrangement becomes more complex
Solution Approach 1:
The housing is segmented with a dedicated sensor opening that provides access to the encoder sensor. This allows the sensor to be accessed and replaced independently through the housing wall without disassembling the entire transmission or opening the main housing.
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 arrangement enables a compact, environmentally protected, and easily accessible rotary encoder setup, facilitating simpler assembly and maintenance by allowing the sensor to be inserted from the outside, reducing the need to open the housing and enhancing the overall efficiency of the cable winch system.
Implementation Method 1
The rotary encoder comprises a disk and a sensor which is designed as a Hall sensor... the magnets being detected by the Hall sensor when they move past the Hall sensor by rotation of the transmission input shaft
Data Source
AI summary
A cable winch, comprising an electric drive motor, a transmission, and a rotary indicator, where the electric drive motor is coupled to the transmission and the rotary indicator is associated with the electric drive motor and/or the transmission in such a way that the rotary indicator provides a signal for determining the rotational speed of the drive motor and/or of the transmission, with the rotary indicator being arranged between the electric drive motor and the transmission.