Transverse Flux Motor Flux Ring Layout for Low-Speed Torque
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Solution Overview
Problem
Existing electric motors face limitations in the number of poles due to the size and weight constraints, which restricts torque generation and require high-speed operation for increased power, making it difficult to achieve low-speed outputs efficiently.
Innovation Solution
The design incorporates a stator with flux rings featuring radially extending flux projections and axial returns, allowing for a higher number of poles without increasing motor size or weight, and includes a rotor with permanent magnets and concentrators for efficient low-speed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If discrete coils are arrayed circumferentially around the axis of rotation to increase the number of poles, then torque generation is improved, but the size and weight of the motor increase
Solution Approach 1:
The patent transitions from conventional radial flux machines to transverse flux machines, fundamentally changing the flux direction from radial to transverse. This dimensional change in flux path allows multiple poles to be arranged in a compact configuration without proportionally increasing motor size, resolving the contradiction between torque generation and weight
Solution Approach 2:
The motor employs segmented flux rings with multiple discrete flux projections instead of continuous structures. This segmentation allows independent optimization of each flux projection and enables compact arrangement of multiple poles, achieving high pole count without proportional increase in overall motor dimensions and weight
2Power
If the rotor operates at high speed to increase power output, then power is improved, but low-speed operation becomes difficult to achieve efficiently
Solution Approach 1:
The transverse flux configuration with multiple poles fundamentally changes the machine's electromagnetic parameters, specifically the torque-speed characteristics. The high pole count creates a lower synchronous speed for a given frequency, enabling efficient low-speed operation without requiring high rotational speeds, thus providing flexible operating speed range
3Quantity of substance
If the stator diameter is increased to accommodate more coils for more poles, then the number of poles is improved, but the size and cost of the motor increase
Solution Approach 1:
By changing from radial to transverse flux configuration, the patent enables a different spatial arrangement of poles that does not require proportional increase in stator diameter. The transverse flux path allows compact packaging of multiple poles within the same stator envelope, increasing pole count without increasing stator area
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 enhances torque generation and enables efficient low-speed operation by maximizing pole interactions while maintaining a compact motor design.
Implementation Method 1
The stator is electrically energized to generate magnetic flux that causes the rotor to rotate
Implementation Method 2
The rotor includes permanent magnets that are acted on by the electromagnetic field induced by current through the stator to cause rotation of the rotor
Data Source
AI summary
A transverse flux motor is formed by a stator portion and a rotor portion. The stator portion includes one or more phase assemblies formed by flux ring plates axially bracketing coil wire windings. The flux rings include teeth that magnetically interact with circumferentially opposed and adjacent teeth to form flux paths transverse to the axis of rotation of the rotor assembly.