Rotating Electric Machine With Double-Ring Rotor And Interleaved Poles
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Solution Overview
Problem
Rotating electric machines with permanent magnet fields face challenges in varying field strength across a wide rotational speed range, leading to losses and size constraints, while hybrid excitation machines increase parts count and suppress permanent magnet potentials.
Innovation Solution
A rotating electric machine design featuring multi-phase coils wound on armature cores with protruding coil ends surrounded by magnetic circuits, creating a brushless variable field without a field winding, and utilizing a double-ring rotor structure with interleaved magnetic poles to enhance torque-acting surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a permanent magnet field is employed to achieve small size and high performance, then the size and performance are improved, but the field strength cannot be varied across a wide rotational speed range leading to losses
Solution Approach 1:
The patent combines permanent magnets and winding fields into a hybrid excitation system. The permanent magnets provide a baseline magnetic field for high efficiency, while the winding field allows variable field strength control across different rotational speeds, resolving the contradiction between fixed field strength and adaptability requirements
Solution Approach 2:
The patent introduces a dynamic field control mechanism where the winding field can be adjusted based on rotational speed requirements. The controller dynamically varies the field strength by controlling the current in the winding field, enabling the system to adapt to different operating conditions while maintaining high efficiency
2Adaptability or versatility
If a winding field is employed instead of permanent magnet field to vary field strength, then field strength variability is improved, but the space required increases considerably
Solution Approach 1:
The patent places the winding field inside the rotor structure, nesting it within the existing permanent magnet arrangement. The winding field is positioned in the rotor core, utilizing the internal space efficiently, thereby avoiding significant volume increase while enabling variable field strength capability
Solution Approach 2:
The patent utilizes the axial dimension by arranging the winding field along the axial direction of the rotor. This dimensional arrangement allows the winding field to be integrated without significantly increasing the radial or circumferential dimensions, thus maintaining a compact machine volume
3Adaptability or versatility
If hybrid excitation machine is designed with exciting coil to form desired magnetic circuit, then field strength variability is improved, but the number of rotor cores increases to 2 increasing parts count and size
Solution Approach 1:
The patent merges the exciting coil function with the rotor core structure by integrating the winding field directly into the rotor core. This integration eliminates the need for separate rotor cores, reducing parts count while maintaining the hybrid excitation capability for variable field strength control
4Power
If electric current supplied to exciting coil is increased to increase output, then output power is improved, but the potentials of permanent magnets are suppressed
Solution Approach 1:
The patent implements a feedback control system that monitors the magnetic field strength and adjusts the winding field current accordingly. The controller detects when permanent magnet potentials are being suppressed and reduces the winding field current to maintain optimal operating conditions, preventing excessive suppression while still achieving high output power
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 achieves high output torque or electric power for its size by increasing torque-acting surfaces and utilizing both magnetomotive forces, minimizing axial length, and allowing for efficient field control without additional windings.
Implementation Method 1
at least one multi-phase coil has at least one coil end part protruding from the at least one armature core and surrounded by at least one magnetic circuit formed in the rotating electric machine
Implementation Method 2
surrounded by at least one magnetic circuit formed in the rotating electric machine
Implementation Method 3
at least one rotor rotatably disposed and having a plurality of magnetic poles facing the at least one armature core
Data Source
AI summary
A rotating electric machine includes at least one multi-phase coil, at least one armature core having the at least one multi-phase coil wound thereon, and at least one rotor rotatably disposed and having a plurality of magnetic poles facing the at least one armature core. The at least one multi-phase coil has at least one coil end part protruding from the at least one armature core and surrounded by at least one magnetic circuit formed in the rotating electric machine. There are a plurality of gaps formed between the at least one armature core and the at least one rotor.