Permanent Magnet Rotor Barriers for Motor Saturation Relief
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Solution Overview
Problem
The magnetic saturation of motors in laundry treatment devices is deepened by quadrature axis armature reaction, limiting performance improvements and increasing production costs.
Innovation Solution
A rotor structure with permanent magnet slots and magnetic barriers that relieve magnetic saturation, improve torque density and overload capacity, and reduce the amount of rare earth permanent magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the amount of permanent magnets is increased to improve motor performance, then the torque density and power output improve, but the production cost increases due to higher rare earth material costs
Solution Approach 1:
The patent applies local quality by creating magnetic barriers with different magnetic permeability than the surrounding rotor core material. These barriers are strategically positioned in specific regions where magnetic saturation occurs, providing localized magnetic field management without requiring additional permanent magnets throughout the entire rotor structure.
Solution Approach 2:
The patent changes the magnetic permeability parameter by introducing magnetic barriers with different permeability characteristics. This parameter change allows the barriers to redirect and distribute magnetic flux, effectively reducing magnetic saturation in critical areas and improving overall motor performance without increasing permanent magnet quantity.
2Reliability
If the magnetic saturation degree is increased to handle higher loads, then the overload capacity improves, but the torque ripple increases causing motor vibration and performance degradation
Solution Approach 1:
The patent converts the harmful effect of magnetic saturation into a beneficial effect by using magnetic barriers to redirect saturated magnetic flux. The barriers transform the concentrated saturated flux into distributed flux patterns, reducing torque ripple while maintaining the high flux density needed for overload capacity.
Solution Approach 2:
The magnetic barriers act as intermediaries between the permanent magnets and the rotor core. They mediate the magnetic flux distribution, preventing direct concentration of flux that causes saturation and torque ripple, while still allowing sufficient flux to pass through to maintain overload capacity.
3Ease of manufacture
If the motor is designed for unidirectional rotation to simplify structure, then the manufacturing cost decreases, but the adaptability for bidirectional applications is limited
Solution Approach 1:
The magnetic barrier structure designed for unidirectional rotation applications can be universally applied to bidirectional motors by simply adjusting the position and orientation of the barriers. The same basic barrier geometry and placement strategy work for both rotation directions, providing a universal solution that maintains manufacturing simplicity while enabling bidirectional operation.
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
Enhances motor performance by suppressing quadrature axis armature reaction, reducing magnetic saturation, and decreasing production costs while maintaining high torque density and overload capacity.
Implementation Method 1
the rotor structure is driven under the magnetic action of the permanent magnets, and can rotate with respect to a stator
Implementation Method 2
the magnetic barriers can be used as a structure for relieving the degree of magnetic saturation
Data Source
AI summary
A rotor structure, a motor structure, and a laundry treatment device are provided. The rotor structure has a rotor iron core, multiple permanent magnets and multiple magnetic barriers. The rotor has multiple permanent magnet slots arranged along a circumferential direction of the rotor core. The permanent magnets are disposed in the permanent magnet slots respectively. The magnetic barriers are disposed on the rotor iron core. The rotor structure can rotate unidirectionally or bidirectionally in the circumferential direction. At least one side of a permanent magnet slot is provided with the magnetic barriers in the rotation direction of the rotor structure. Two ends of each magnetic barrier face towards the permanent magnet corresponding to the permanent magnet slot and towards the outer edge of the rotor core, respectively.