Movable Self-Directing Stator for Low-Loss Electrical Machines
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Solution Overview
Problem
Existing electrical machines face inefficiencies due to energy losses and heating issues caused by eddy currents and magnetic field dissipation, which limit their operational range and efficiency, especially as rotational speed increases.
Innovation Solution
The introduction of a movable stator that can rotate freely with respect to both the stationary stator and rotor, made of ferromagnetic materials, to optimize the magnetic field orientation and reduce eddy currents, thereby enhancing energy transmission and reducing losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the magnetic field is concentrated in the area of electric current flowing in the windings, then maximum torque and efficiency are achieved, but the magnetic field distribution becomes sensitive to rotor angle, making it difficult to maintain optimal field concentration across all rotation positions
Solution Approach 1:
The invention divides the traditional single stator-rotor system into three independent rotating elements: stationary stator, movable stator, and rotor. Each element can rotate independently, allowing the magnetic field to be segmented and directed through different paths. The movable stator acts as an intermediate element that segments the magnetic field transmission, enabling optimal field concentration in the rotor winding area without requiring complex control of the entire magnetic circuit.
Solution Approach 2:
The movable stator serves as an intermediary element between the stationary stator and the rotor. It mediates the magnetic field transmission by rotating independently to maintain optimal magnetic coupling. This intermediary structure allows the magnetic field to be effectively concentrated in the rotor winding area without direct coupling constraints, solving the angle sensitivity problem while maintaining high torque production.
2Productivity
If the rotor rotates at high speed, then productivity increases, but eddy currents and magnetic field dissipation increase, causing heating and efficiency loss
Solution Approach 1:
The invention introduces dynamic independence by allowing the movable stator to rotate at different speeds and in different directions relative to both the stationary stator and the rotor. This dynamic configuration optimizes magnetic field coupling at various operational speeds. By independently adjusting the movable stator's rotation, the system maintains efficient magnetic transmission even at high rotational speeds, reducing eddy current losses and heating effects.
Solution Approach 2:
The system changes operational parameters by introducing an additional degree of freedom through the movable stator's independent rotation. This allows optimization of magnetic field strength, direction, and coupling efficiency as functions of rotational speed. By adjusting the movable stator's angular position and speed independently, the system compensates for increased eddy current losses at high speeds, maintaining efficiency across a broader operational range.
3Power
If ferromagnetic materials are used to concentrate the magnetic field, then torque and efficiency improve, but eddy currents are generated in the rotating magnetic core, causing heating and limiting maximum rotational speed
Solution Approach 1:
The invention segments the ferromagnetic materials into two separate rotating elements: the movable stator and the rotor. Each element can be optimized for different functions. The movable stator, which rotates independently, carries the ferromagnetic materials for magnetic field concentration, while the rotor focuses on electromagnetic induction. This segmentation reduces eddy current paths and heating in the rotor, allowing high-speed operation while maintaining torque production.
Solution Approach 2:
The movable stator acts as an intermediary that carries the ferromagnetic materials needed for magnetic field concentration. By placing these materials in the movable stator rather than the rotor, the system achieves effective magnetic field management without subjecting the rotor to excessive eddy current heating. The intermediary structure allows the rotor to operate at higher speeds with reduced thermal constraints.
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 configuration improves the concentration of the magnetic field, increases torque, and reduces heating and losses, leading to a more efficient and lightweight electrical machine with improved operational characteristics.
Implementation Method 1
The movable stator is made at least partially of ferromagnetic materials and is located coaxially inside the hollow rotor... capable of orienting to the magnetic field generated by the machine
Implementation Method 2
The electrical machine uses magnetic induction to transmit energy between the stator and the rotor
Implementation Method 3
The rotation of the magnetic core (as part of the rotor) leads to the generation of eddy currents in the magnetic core... The introduction of a movable stator that can rotate freely with respect to both the stationary stator and rotor, made of ferromagnetic materials, to optimize the magnetic field orientation and reduce eddy currents
Data Source
AI summary
An electrical machine with two or more stators is proposed. One stator (1) is stationary and is fixed to the body (4) of the machine, and the second stator (6) is movable and can rotate freely to both the rotor (2) and the stationary stator (1). The movable stator (6) is self-orienting according to the lines of the magnetic field created by the electric windings and/or permanent magnets of the stationary stator (1). The movable stator (6) concentrates and shapes up the magnetic field B so that the magnetic lines are almost perpendicular to the rotor windings. The movable stator (6) does not rotate relative to the magnetic field of the stationary stator (1) and the magnetic field in it does not change, there is no continuous re-magnetization, magnetic hysteresis is avoided and no eddy currents are generated, due to which the losses and heating of the machine are reduced. The movable stator (6) may comprise permanent magnets to increase the magnetic field in the rotor active zones (2).