Two-Layer Lundell Motor Magnetic Flux Barrier Design
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Solution Overview
Problem
Existing multi-Lundell motors face challenges in increasing torque and output while reducing magnetic interference between stator units and accurately detecting the magnetic flux of permanent magnets, which is hindered by the complexity of components and magnetic interference.
Innovation Solution
A two-layer motor design with A-phase and B-phase rotors and stators, each comprising two rotor/stator cores with claw poles and a field magnet, where the A-phase and B-phase components are arranged at an electrical angle of 90 degrees, and a control unit adjusts the phase angle and excitation width of input voltages to optimize torque and output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an insulator such as a spacer is arranged between the stator units to form a gap between the stator units, then magnetic interference between the stator units is reduced, but the number of components increases
Solution Approach 1:
The patent introduces a magnetic flux barrier as an intermediary element positioned between adjacent stator units. This barrier acts as a mediator that selectively blocks magnetic flux paths, preventing magnetic interference between stator units while maintaining a compact structure without requiring additional spacers or insulation components.
Solution Approach 2:
The magnetic flux barrier is strategically positioned only in specific locations where magnetic interference occurs between stator units, rather than using a comprehensive insulation approach throughout the entire motor structure. This localized solution reduces the number of components while effectively addressing the magnetic interference problem.
2Measurement precision
If the magnetic flux of the permanent magnet of the rotor is detected by a sensor arranged opposing an axial end of the rotor, then the rotation angle of the rotor can be detected, but the magnetic flux of the stator greatly affects the sensor making it difficult to accurately detect the magnetic flux of the permanent magnet
Solution Approach 1:
The magnetic flux barrier serves as a mediator that selectively blocks magnetic flux paths from the stator while allowing the sensor to detect the magnetic flux from the permanent magnet. This intermediary element filters out unwanted magnetic interference, enabling accurate detection of the rotor's magnetic flux without requiring complex sensor shielding or positioning adjustments.
3Power
If the excitation width is set to 180 degrees or less and the angular phase is advanced, then torque and output are increased, but the control complexity increases
Solution Approach 1:
The patent optimizes the excitation width parameter to 180 degrees or less and advances the angular phase of the input voltage to specific ranges. These parameter changes maximize torque and output while the control unit is designed to efficiently manage these optimized parameters, balancing performance improvement with acceptable control complexity.
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 design enhances torque and output by minimizing magnetic interference and allowing accurate detection of magnetic flux, reducing the number of components and improving motor performance.
Implementation Method 1
a field magnet, which is located between the two rotor cores
Implementation Method 2
The Lundell rotor functions so that the polarity of the claw poles change alternately
Implementation Method 3
a sensor that detects the magnetic flux of the permanent magnet of the rotor may be arranged opposing an axial end of the rotor and detect the rotation angle of the rotor
Data Source
AI summary
This motor includes a two-layer rotor, a two-layer stator and a control unit. An A-phase rotor includes a pair of rotor cores and a field magnet. A B-phase rotor includes a pair of rotor cores and a field magnet. An A-phase stator includes a pair of stator cores and an A-phase winding. A B-phase stator includes a pair of stator cores and a B-phase winding. The control unit controls an A-phase input voltage applied to the A-phase winding, and a B-phase input voltage applied to the B-phase winding. The relative arrangement angle of the A-phase stator and the A-phase rotor relative to the B-phase stator and the B-phase rotor is set to an electrical angle of 90 degrees. The control unit applies a leading phase angle to the basic voltage waveforms of the A-phase input voltage and the B-phase input voltage, to set the energization width to at most 180 degrees.