Elevator Drive Machine Motor Suspension Design
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Solution Overview
Problem
Elevator drive machines face challenges in balancing high power, safety, and ease of transport and assembly, particularly with increasing demands for speed and payload, requiring a design that can absorb high forces while preventing mechanical tension and facilitating easy installation and maintenance.
Innovation Solution
A drive machine design featuring a solvable coupling between the electric motor's rotor and drive shaft, allowing for direct drive with free suspension of the motor, which simplifies transport and assembly, and includes a brake device for safety, with a clutch area that can be cone-shaped for frictional connection and a clamping element for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the electric motor is rigidly fixed to the drive shaft with complex support structures, then the mechanical connection is strong and stable, but the assembly becomes overly constrained leading to mechanical stress and difficult disassembly
Solution Approach 1:
The coupling device is divided into separate components: a coupling element attached to the drive shaft and a receptacle element attached to the motor shaft. This segmentation allows independent assembly and disassembly while maintaining strong mechanical connection during operation, resolving the contradiction between connection strength and assembly complexity.
Solution Approach 2:
The coupling device acts as an intermediary element between the motor shaft and drive shaft. It provides a simple插接 (plug-in) connection that ensures reliable torque transmission without requiring complex support structures, eliminating mechanical stress from over-constraint while facilitating easy assembly and disassembly.
2Reliability
If the drive shaft and motor are designed as a single integrated unit, then the mechanical connection is most stable, but transport and assembly become significantly more difficult
Solution Approach 1:
The drive system is segmented into separable components: the motor assembly and the drive shaft assembly, connected through the coupling device. This allows each component to be transported independently to the installation site and assembled on-site, greatly improving transport and assembly ease while maintaining connection reliability through the specialized coupling mechanism.
Solution Approach 2:
The coupling elements are pre-attached to their respective components (motor shaft and drive shaft) during manufacturing. This preliminary action ensures that when the components are brought together at the installation site, they can be quickly connected without requiring complex assembly procedures, thus maintaining reliability while improving ease of operation.
3Ease of operation
If the motor is freely suspended from the drive shaft, then transport and assembly are simplified, but additional support structures are needed to prevent mechanical tension
Solution Approach 1:
The complex support structures (such as pendulum supports) are completely removed from the design. Instead, the motor is freely suspended from the drive shaft through the coupling device, which inherently provides the necessary mechanical connection without requiring additional support structures, thus simplifying the overall system while maintaining transport and assembly ease.
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 design enhances the drive machine's power and safety, allows for easy assembly and disassembly, and ensures reliable operation by preventing mechanical tension and facilitating independent testing of components, while maintaining safety through effective braking mechanisms.
Implementation Method 1
a clutch area which tapers away from the rotational axis in the form of a cone and which establishes a frictional connection between the drive shaft and the rotor
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
To facilitate the transport of a drive unit (1) intended for moving an elevator car in a shaft, it is proposed to design a direct drive such that an electric motor (2) of the drive unit (1) is mounted on or inserted into a drive shaft (3) that serves to drive at least one belt (5), so that the electric motor (2) is suspended from the drive shaft (3) without support. This design offers the advantage that the drive unit (1) can be assembled/disassembled relatively easily and the individual components can be transported separately to the installation site.