Concentric Dual-Winding DC Motor for Emergency Sliding Door Operation
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Solution Overview
Problem
Existing solutions for automatic sliding door automation units on escape routes are costly and complex, failing to meet safety standards while being economically advantageous and compact.
Innovation Solution
A direct-current electric motor with concentric, superimposed, and insulated windings connected to separate power units and control circuits, allowing independent operation and alternate power supply from a battery for fault-free operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a breakaway system with multiple components is used to ensure door opening in emergencies, then safety is improved, but production and assembly cost increases considerably
Solution Approach 1:
The patent combines multiple independent components (separate emergency motor, separate battery, separate control circuit) into a single integrated motor unit with dual windings sharing a common stator and control electronics. This merging reduces component count, simplifies assembly, and lowers production costs while maintaining the fail-safe door opening capability.
2Reliability
If a redundant system with duplicated electronic control components and alternative power source is implemented, then system reliability is improved, but device complexity and installation complexity increase significantly
Solution Approach 1:
The motor unit is designed to perform multiple functions through its dual windings: normal operation mode using the first winding with mains power, and emergency mode using the second winding with battery power. The single motor housing and control system serve both functions, eliminating the need for separate emergency motor and control units, thus reducing system complexity while maintaining redundancy.
3Reliability
If two separate motors with elastic coupling are used for traction system, then reliability is improved, but device size and installation complexity increase
Solution Approach 1:
The patent nests the second winding inside the same stator body as the first winding, with both windings concentric around a single driving shaft. This nested configuration allows the emergency motor functionality to be contained within the volume of the normal motor, eliminating the need for a separate emergency motor and reducing overall device size while maintaining redundant operation 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
The motor ensures reliable and cost-effective operation of automatic sliding doors, maintaining safety standards with reduced size and complexity, enhancing durability and quietness by minimizing mechanical imbalances and vibrations.
Implementation Method 1
a first winding (6) and a second winding (7) which are concentric, superimposed and electrically insulated with respect to each other for their connection respectively to a first power unit and to a second power unit for their independent actuation
Data Source
AI summary
A direct-current electric motor, particularly for operating automatic sliding doors, comprising a single stator body (2) that supports permanent magnets (3) and accommodates a rotor (4) constituted by a single driving shaft (5) around which a first winding (6) and a second winding (7) are wound. The first winding (6) and the second winding (7) are concentric, superimposed and electrically insulated with respect to each other for their connection respectively to a first power unit and a second power unit for their independent actuation.