Permanent Magnet Linear Drive System for Elevator Guidance
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Solution Overview
Problem
Elevator installations with linear motor drive systems face challenges in achieving precise and secure guidance while minimizing space in the elevator shaft, especially in rucksack configurations that require only one wall for drive, support, and guidance, leading to complex, material-intensive, and cost-intensive solutions.
Innovation Solution
A permanent magnet linear drive system with inclined interaction surfaces on the stationary part and corresponding movable parts, allowing for three-dimensional guidance and stabilization of the elevator car, reducing the need for additional guide elements and minimizing space usage by utilizing attraction forces for both movement and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional guide rails and guide shoes are provided to achieve precise guidance, then guidance precision is improved, but device complexity and material usage increase
Solution Approach 1:
The patent combines the drive function and guidance function into a single integrated linear drive system. The stationary part and movable part with inclined interaction surfaces simultaneously provide both propulsion and three-dimensional guidance, eliminating the need for separate guide rails and guide shoes while maintaining precise guidance.
Solution Approach 2:
The linear drive system is designed to perform multiple functions: it provides drive force for moving the elevator car and simultaneously ensures precise three-dimensional guidance. The inclined interaction surfaces enable the system to handle both horizontal and vertical force components, making the drive system universal for both movement and guidance tasks.
2Stability of the object's composition
If guide rails and additional support means are installed to prevent tipping, then stability is improved, but device complexity and space consumption increase
Solution Approach 1:
The patent merges the stabilization function into the linear drive system itself. The inclined interaction surfaces generate lateral attraction forces that automatically counteract tipping moments, providing stability without requiring separate guide rails or additional support means.
Solution Approach 2:
The patent converts the potentially harmful lateral tipping forces into beneficial stabilization. The inclined surfaces are designed so that when the elevator car experiences tipping moments, the resulting lateral movements generate attraction forces that counteract the tipping, effectively using the destabilizing forces to create stabilizing effects.
3Power
If a permanent magnet linear drive system is used for direct drive, then drive efficiency is improved, but attraction forces cause guidance problems
Solution Approach 1:
The patent changes the geometric parameters of the interaction surfaces by introducing inclination angles. This parameter change allows the system to resolve the attraction forces into vertical drive components and horizontal guidance components, enabling the permanent magnet linear drive system to provide both efficient direct drive and precise guidance simultaneously.
4Volume of stationary object
If elevator installation in rucksack configuration is implemented to save space, then space usage is improved, but guidance and support become more difficult
Solution Approach 1:
The patent combines drive, guidance, and support functions into a single linear drive system installed on one wall in rucksack configuration. The inclined interaction surfaces enable the system to provide all necessary functions (vertical drive, lateral guidance, and tipping prevention) without requiring additional space for separate components.
Solution Approach 2:
The linear drive system in rucksack configuration is designed as a universal system that performs multiple functions: it provides vertical propulsion, ensures lateral guidance, and prevents tipping. This multi-functionality allows the system to operate effectively in the space-constrained rucksack configuration without requiring additional guidance and support components.
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 provides precise, secure, and space-efficient guidance and stabilization of the elevator car, reducing friction losses and the need for additional mechanical support, while allowing for efficient use of the elevator shaft space and cost reduction.
Implementation Method 1
Linear motor drive systems, particularly those operating with permanent magnets, have very high attraction forces between a primary- or stationary-part and a secondary- or movable-part
Implementation Method 2
A permanent magnet linear drive system with inclined interaction surfaces on the stationary part and corresponding movable parts, allowing for three-dimensional guidance and stabilization of the elevator car, reducing the need for additional guide elements
Data Source
AI summary
An elevator installation has an elevator car and a permanent magnet linear drive system with a stationary part and a movable part, which moves along the stationary part when the permanent magnet linear drive system is controlled in a drive mode. The elevator car is arranged in a rucksack configuration. The stationary part has two inclined interaction surfaces which include an angle between 0° and 180°. The movable part comprises two units which are so arranged in common on a rear side of the elevator car and mechanically positively connected with the elevator car that in the case of drive control each of the two units produces a movement along one of the interaction surfaces in order to thus move the elevator car.