Linear Propulsion System with Angled Magnet Layers
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Solution Overview
Problem
Existing self-propelled elevator systems are costly and inefficient, particularly in high-rise buildings where multiple elevator cars in a single hoistway require effective directional travel without the mass of ropes, and existing systems face challenges in reducing thrust force ripple and improving ride quality.
Innovation Solution
A linear propulsion system utilizing a stator with magnetic poles and a mover with ferromagnetic strata, slots, and wire coils, where the magnet layers are angled and the coils are perpendicular to the magnetic flux, and multiple movers are used to reduce thrust force ripple and improve efficiency, with the stator and movers positioned to optimize thrust and reduce vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple elevator cars operate in a single hoistway without ropes, then system cost and complexity are reduced, but thrust force ripple and ride quality deteriorate
Solution Approach 1:
The linear motor is divided into multiple independent phase windings (typically three phases) distributed along the stator. Each phase generates thrust independently, and their combined effect produces smooth overall motion. The segmentation of windings allows for phased activation that cancels out thrust ripple, resolving the contradiction between simplified ropeless design and ride quality.
Solution Approach 2:
The motor employs periodic activation of different phase windings along the stator length. By sequentially energizing phases in a controlled pattern, the system maintains continuous thrust while minimizing ripple. This periodic action ensures that as one phase completes its thrust cycle, another phase is already active, smoothing out force variations and improving ride quality in the ropeless multi-car system.
2Ease of manufacture
If linear propulsion system uses traditional orthogonal coil arrangement, then manufacturing is simplified, but thrust force ripple increases
Solution Approach 1:
The coil windings are arranged asymmetrically along the stator length rather than uniformly. Different phases are positioned at offset locations, creating an asymmetric distribution that enables phased thrust generation. This asymmetric arrangement allows the motor to produce smoother combined thrust from multiple phases, reducing thrust ripple while maintaining manufacturing feasibility through standardized winding 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 system achieves cost-effective and efficient directional travel for multiple elevator cars in a single hoistway by minimizing thrust force ripple and enhancing ride quality through optimized magnetic interaction and positioning of stator and movers, resulting in improved thrust force and reduced operational costs.
Implementation Method 1
the coils may have an activated state and a deactivated state. Each coil may be disposed substantially perpendicularly to the direction of magnetic flux of the permanent magnet layer around which the coil is wound
Implementation Method 2
a plurality of permanent magnet layers. Each permanent magnet layer may be sandwiched between two of the strata and disposed inside one of the plurality of coils
Data Source
AI summary
A linear propulsion machine and system (10) is disclosed that includes a stator (30) having a plurality of teeth (34) and a mover (32) moveable in a linear direction along the stator (30). The mover may include a plurality of spaced apart ferromagnetic strata (40), a plurality of slots (42), a plurality of wire coils (44), and a plurality of magnet layers (46). Each of the slots (42) may be adjacent to at least one of the strata (40). Each coil (44) may be disposed in a slot (42). Each magnet layer (46) may be sandwiched between strata (40) and disposed inside one of the plurality of coils (44). Each coil (44) is disposed perpendicularly to the direction of magnetic flux of the magnet layer (46) around which the coil (44) is wound. In an embodiment, the teeth (34) or the magnet layer (46) may be disposed at an angle.