Rotary Slide Drive with Magnetic Position Sensing in Tight Spaces
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Solution Overview
Problem
Existing drive devices for activating rotary slides in electrically operated vehicles face challenges in achieving precise angular positioning and compactness, leading to complex construction and high replacement costs due to the need for complex measurement technology and limited installation space.
Innovation Solution
A drive device with an electric motor and gearbox configured for a small installation height, featuring a magnet on the rotary slide output shaft for precise position detection using a sensor unit, and a gearbox with a dual-stage spur gear for silent operation, allowing for a suitable gearing ratio with reduced rotating speed and increased starting torque, enabling precise and efficient angular positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complex measurement technology is used to achieve precise angular positioning of the rotary slide, then positioning precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces complex mechanical measurement technology with a magnetic field-based sensor system. A magnet is attached to the rotary slide output shaft, and a sensor unit detects its position through magnetic field interaction, eliminating the need for complex mechanical encoders or measurement devices while achieving precise angular positioning.
Solution Approach 2:
The patent introduces a magnet as an intermediary element between the rotary slide output shaft and the sensor unit. This magnet serves as a simple yet effective mediator that enables precise position detection through magnetic field interaction, replacing complex direct mechanical measurement systems.
2Volume of moving object
If the drive device is made compact to reduce installation space, then installation space is reduced, but achieving precise positioning becomes more difficult
Solution Approach 1:
The patent transitions from mechanical measurement approaches to a magnetic field-based detection system that operates in a different dimensional space. The sensor unit detects the magnet's position through magnetic field interaction, allowing precise angular position detection in a compact configuration without requiring extensive mechanical measurement infrastructure.
3Force
If a high gearing ratio is used to increase starting torque, then starting torque is improved, but device complexity increases
Solution Approach 1:
The patent optimizes the gearing ratio parameters to achieve the required starting torque while maintaining a relatively simple gearbox structure. By carefully selecting and adjusting the gearing ratio, the system achieves high starting torque without requiring overly complex multi-stage gear arrangements.
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, cost-effective, and efficient drive device with precise angular positioning, overcoming the issues of complexity and high replacement costs, while maintaining a small installation space and reducing the risk of 'sticky' operation after long stationary periods.
Implementation Method 1
a magnet is disposed on an end region of the rotary slide output shaft. The drive device additionally comprises a sensor unit which is configured for detecting a rotary position of the magnet
Data Source
AI summary
The invention relates to a drive device for activating a rotary slide for a fluid system of an at least in part electrically operated motor vehicle. The drive device comprises an electric motor having a motor output shaft, a rotary slide output shaft configured for activating a rotary slide, wherein the rotary slide output shaft is aligned so as to be orthogonal to the motor output shaft, and a magnet is disposed on an end region of the rotary slide output shaft, and a sensor unit which is configured for detecting a rotary position of the magnet and thus of the rotary slide output shaft.