Long Stator Linear Motor Transport Unit Magnetic Flux Control
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Solution Overview
Problem
Long stator linear motors face challenges in flexible control of transport units due to fixed energy conditions and complex power electronics, limiting speed range and propulsive force variability without increasing energy consumption or complexity.
Innovation Solution
The solution involves changing the magnetic reluctance and magnetomotive force of the magnetic circuit by adjusting the position of drive magnets and coils, or introducing magnetic reluctance elements, to influence movement variables like propulsive force and speed without altering the energy-related basic conditions of the power electronics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the speed range and propulsive force variability are increased by conventional field-weakening regulation, then the operational flexibility is improved, but the electrical losses increase and maximum achievable speed is limited
Solution Approach 1:
The patent changes the magnetic flux parameter of the magnetic circuit by adjusting magnetic reluctance (through movable magnetic elements) and magnetomotive force (through additional coils), enabling speed and force variability without conventional field-weakening regulation, thus reducing electrical losses while maintaining operational flexibility
Solution Approach 2:
The patent introduces magnetic reluctance elements and additional coils as intermediary components that mediate the magnetic circuit properties, allowing indirect control of propulsive force and speed without directly increasing electrical losses in the power electronics
2Force
If the magnetic flux is increased to enhance propulsive force, then the force generation is improved, but the maximum achievable speed is reduced
Solution Approach 1:
The patent makes the magnetic flux dynamic and adjustable during operation by changing magnetic reluctance and magnetomotive force, allowing the system to optimize between propulsive force and speed requirements in real-time, rather than being fixed in one state
Solution Approach 2:
The patent changes the magnetic flux parameter dynamically through adjustment of magnetic reluctance elements and additional coil excitation, enabling the system to achieve both high propulsive force when needed and high speed when needed, resolving the traditional trade-off
3Speed
If additional power electronics are added to expand speed range, then the speed variability is improved, but the device complexity increases
Solution Approach 1:
The patent makes the existing power electronics multi-functional by using them to control both the drive coils and additional coils, allowing the same power electronics to achieve both propulsion and magnetic flux regulation without requiring separate dedicated circuits
Solution Approach 2:
The patent introduces magnetic reluctance elements and additional coils as intermediary components that enable speed and force control through magnetic circuit modification rather than through complex power electronics, simplifying the overall system architecture
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 approach allows for flexible control of transport units, reducing electrical losses and increasing maximum achievable speed without field-weakening regulation, thus enhancing the operational flexibility and efficiency of long stator linear motors.
Implementation Method 1
drive magnets of the transport unit interacting with drive coils of the long stator linear motor in order to generate a propulsive force
Implementation Method 2
drive magnets of the transport unit and the drive coils of the transport route of the long stator linear motor being sources of magnetomotive force for a developing magnetic circuit
Data Source
AI summary
Method for operating a transport apparatus that utilizes a long stator linear motor, the method includes moving a transport unit along a transport route of the long stator linear motor, causing drive magnets arranged on both sides of a main body of the transport unit to interact, at least in a region of a transfer position for transferring the transfer unit between two opposite route portions of the transport route, with drive coils of the opposite route portions of the transport route in order to generate a propulsive force (Fv), utilizing the drive magnets of the transport unit and the drive coils of the transport route of the long stator linear motor as sources of magnetomotive force of a magnetic circuit that develops at least in the region of the transfer position on both sides of the transport unit, and transferring the transport unit between the opposite route portions of the transport route in the transfer position by changing on at least one side of the transfer unit a magnetic flux (Ψ1, Ψ2) of the magnetic circuit of the at least one side during movement of the transport unit along the transport route in order to generate a lateral force acting on the transport unit.