Poly-phase Reluctance Motor with Transverse Flux
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Solution Overview
Problem
Conventional multi-phase permanent magnet synchronous motors face challenges with magnetic coupling between phases, leading to reduced precision in current control, increased copper loss, and restricted structural strength and temperature rise, limiting their efficiency and applicability.
Innovation Solution
A multi-phase reluctance electric motor with transverse magnetic flux is designed, featuring a stator and rotor with integrated structures, including a gas partition channel, ring-shaped iron core segments, and radially magnetized or parallel tile-shaped permanent magnets, which eliminates mutual inductance between phases, simplifies armature coil requirements, and enhances control precision and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If permanent magnets are positioned on the stator in a conventional multi-phase permanent magnet synchronous motor, then the motor can generate magnetic flux, but the structural strength and allowable temperature rise of the stator are restricted
Solution Approach 1:
The patent inverts the conventional arrangement by positioning permanent magnets on the rotor instead of the stator. This allows the stator to be constructed with stronger materials better suited for withstanding high temperatures and mechanical stresses, while the rotor carries the permanent magnets. The inversion resolves the contradiction by separating the magnetic flux generation function (now on rotor) from the structural support function (now on stator).
2Power
If a distributed winding is used in a conventional multi-phase permanent magnet synchronous motor, then the motor can generate magnetic flux, but the end wires are long and the copper loss is great
Solution Approach 1:
The patent segments the winding system into separate single-phase armature members, each with its own concentrated winding. This segmentation eliminates the need for long distributed windings and reduces copper loss by concentrating the windings closer to the magnetic sources. Each segment operates independently, reducing the total wire length required while maintaining magnetic flux generation capability.
3Productivity
If separate phases with magnetic coupling are used in a conventional multi-phase permanent magnet synchronous motor, then the motor can operate as a multi-phase system, but the mutual inductance will adversely affect the precision on current control
Solution Approach 1:
The patent segments the motor into multiple independent single-phase armature members with concentrated windings, each phase being spatially separated and magnetically isolated from others. This segmentation eliminates mutual inductance between phases, allowing each phase to be controlled independently with high precision current control, while the multi-phase system maintains high productivity through coordinated operation of all phases.
4Power
If a distributed winding with many coils is used in a conventional multi-phase permanent magnet synchronous motor, then the motor can generate magnetic flux, but the insulation of the winding is complex and the manufacturing cost is high
Solution Approach 1:
The patent segments the winding into simple concentrated windings for each single-phase armature member, eliminating the complex distributed winding structure. Each segment requires minimal insulation and can be manufactured independently, significantly reducing insulation complexity and manufacturing cost while maintaining the ability to generate magnetic flux through the concentrated windings and permanent magnet interaction.
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
The motor achieves improved control precision, reduced copper loss, and increased efficiency, allowing for easier torque enhancement and increased reliability, thus expanding its applicability by positioning permanent magnets on the stator.
Implementation Method 1
the 2n number of permanent magnets 3 utilizes permanent magnet having a tile-shaped structure which is radially magnetized or magnetized in parallel
Implementation Method 2
an armature coil 2 and 2n number of permanent magnets 3; wherein the armature coil 2 has an annular coil structure and the armature coil 2 is embedded within an annular space formed between the first iron core segment, the second iron core segment and the third iron core segments
Implementation Method 3
the armature coil 2 has an annular coil structure and the armature coil 2 is embedded within an annular space formed between the first iron core segment, the second iron core segment and the third iron core segments
Data Source
AI summary
A multi-phase reluctance electric motor with transverse magnetic flux which includes a stator and a rotor. The stator comprises a housing (1) and a number m of phase armature units, each being staggered at an electrical angle of 360°/m along the circumferential direction sequentially in the housing (1) along the axial direction and comprises an armature iron core, an armature coil (2) and permanent magnets (3). The armature coil (2) is embedded within an annular space formed among first, second and third annular iron core segments (6, 7, 8) of the armature iron core. The pole distance τm between two adjacent permanent magnets (3) on the same segment and the tooth distance τp between the rotor teeth (5) along the circumferential direction fulfil 2 τm=τp. This motor eliminates mutual inductance between phases, improving control precision of current and electromagnetic torque and dynamic characteristics of the system.