Elevator Linear Motor Mover Position Control
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Solution Overview
Problem
High-rise elevators face challenges with the weight of hoist ropes and tilting issues due to the need for additional windings to maintain levitation and stabilize the mover relative to the stator, leading to uncomfortable vibrations for passengers.
Innovation Solution
An electric linear motor design with at least two stators on opposite sides and two units of electromagnetic components, including windings and permanent magnets, arranged to control the mover's position and tilting by independently controlling the d-axis component of currents injected into the windings, eliminating the need for additional windings for levitation and tilting control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional windings are added to maintain levitation and stabilize the mover, then the mover position control is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent makes the traction windings perform multiple functions: they generate both the traction force for moving the elevator car and the levitation force for maintaining the air gap. By controlling the d-axis and q-axis current components independently, the same winding system achieves both propulsion and levitation, eliminating the need for separate winding sets and reducing overall system complexity
Solution Approach 2:
The patent combines the previously separate traction windings and levitation windings into a single integrated winding system. The mover contains one set of windings that serves dual purposes, with independent control of current components allowing simultaneous achievement of traction and levitation functions, thereby simplifying the device structure
2Stability of the object's composition
If additional windings are added for levitation control, then the mover stability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The patent makes the traction windings perform multiple functions: they generate both the traction force for moving the elevator car and the levitation force for maintaining the air gap. By controlling the d-axis and q-axis current components independently, the same winding system achieves both propulsion and levitation, eliminating the need for separate winding sets and reducing overall system complexity
Solution Approach 2:
The patent changes the control parameters by independently regulating the d-axis and q-axis current components. This allows dynamic adjustment of the magnetic field to achieve both traction and levitation effects, maintaining mover stability without requiring additional windings or higher manufacturing precision
3Reliability
If additional windings are added for tilting control, then the mover position control is improved, but the device complexity increases
Solution Approach 1:
The patent makes the traction windings perform multiple functions: they generate both the traction force for moving the elevator car and the levitation force for maintaining the air gap. By controlling the d-axis and q-axis current components independently, the same winding system achieves both propulsion and levitation, eliminating the need for separate winding sets and reducing overall system complexity
Solution Approach 2:
The patent introduces dynamic control of the winding currents through independent d-axis and q-axis component regulation. This dynamic control enables the system to adaptively adjust magnetic field distribution to achieve traction, levitation, and tilting correction functions, improving position control without adding static structural complexity
4Force
If traditional linear motor design is used with windings on stator, then the motor can generate sufficient force, but the winding material consumption increases significantly
Solution Approach 1:
The patent inverts the traditional linear motor design by placing the windings on the mover instead of on the stator. The stator contains only permanent magnets, while the mover contains the controllable windings. This inversion reduces the length of windings required since the windings move with the car rather than spanning the entire shaft length, significantly reducing material consumption while maintaining force generation capability
Solution Approach 2:
The patent segments the magnetic field generation functions: permanent magnets on the stator provide the base magnetic field, while controllable windings on the mover provide the variable component. This segmentation allows force generation with reduced winding material since only the moving portion requires controllable windings, not the entire stator length
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 solution effectively controls the levitation and tilting of the mover along the stator beam, reducing the need for additional windings and minimizing vibrations, thereby enhancing passenger comfort and operational efficiency.
Implementation Method 1
The rotor, or 'mover', typically comprises permanent magnets, magnetic fields of which, when being in electromagnetic engagement with the 'traveling' magnetic field of the stator, causes the rotor to move along the linear stator
Implementation Method 2
magnetic fields of which, when being in electromagnetic engagement with the 'traveling' magnetic field of the stator, causes the rotor to move
Implementation Method 3
controlling the d-axis component of currents injected to the windings, respectively and independently of each other, for controlling the movement and the tilting of the mover
Data Source
Figure 1~5
Figure 6~7B
Figure 7C
AI summary
An electric linear motor (125) for an elevator (100) and a method for controlling the operation thereof are presented. The electric linear motor (125) comprises at least one stator beam (130) and at least one mover (160), wherein said at least one stator beam (130) comprises at least two stators (301, 302; 303, 304) on opposite sides of the stator beam (130), and the at least one mover (160) is in electromagnetic engagement with said at least two stators (301, 302; 303, 304) and configured to be moved relative to said stator beam (130). Said at least one mover (160) comprises at least two units of electromagnetic components (311, 312; 313, 314) arranged on opposite sides of the stator beam (130) to face said at least two stators (301, 302; 303, 304) for controlling the movement and the position of the mover (160) with respect to said stator beam (130).