Adjustable Tooth Head Ring for Electric Machine Load Efficiency
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Solution Overview
Problem
Existing electric machines struggle to maintain high efficiency across varying load states, particularly in full-load and semi-load operations, leading to inefficiencies and increased losses.
Innovation Solution
Incorporating a tooth head ring in the annular gap between the stator and rotor laminated cores, allowing for adjustable relative positions to optimize magnetic flux and torque based on load conditions, with actuation or passive mechanisms to transition between positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the stator windings are received in grooves that open radially inward with webs extending radially inward to partially close the grooves, then the magnetic flux path is improved and torque is enhanced, but the device complexity increases due to the additional tooth head ring component and adjustable positioning mechanism
Solution Approach 1:
The tooth head ring is designed to be adjustable between two distinct positions: a first position where tooth heads abut the teeth of the stator laminated core for high torque output, and a second position where tooth heads abut the grooves for reduced losses. This dynamic repositioning capability allows the machine to adapt its magnetic circuit configuration based on load conditions, resolving the contradiction between maximizing torque and minimizing losses by making the structure dynamically adjustable rather than fixed
Solution Approach 2:
The tooth head ring serves as an intermediary component between the stator and rotor laminated cores. It mediates the magnetic flux path by providing two alternative configurations: abutting the teeth to enhance flux for high torque, or abutting the grooves to reduce eddy current losses. This intermediary element enables flexible control over the magnetic circuit without requiring direct modification of the stator or rotor core structures
2Loss of energy
If the machine operates in full-load condition with tooth heads abutting the teeth, then torque output is maximized, but energy losses increase; conversely, if operating in semi-load with tooth heads abutting grooves, then losses are reduced but torque capability decreases
Solution Approach 1:
The system dynamically adjusts the tooth head ring position based on operating load conditions. In full-load operation, the tooth heads are positioned to abut the stator teeth, creating an optimized magnetic flux path for maximum torque. In semi-load operation, the tooth heads are repositioned to abut the grooves, reducing eddy current losses. This dynamic adaptation resolves the contradiction by allowing the machine to optimize for torque when needed and for efficiency when load is reduced
Solution Approach 2:
The invention changes the physical configuration parameter of the magnetic circuit by repositioning the tooth head ring. This parameter change alters the magnetic flux distribution and impedance characteristics of the machine. By changing the position parameter between two discrete states, the system optimizes performance for different operating conditions, resolving the contradiction between torque capability and energy losses through parameter adaptation
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
Enables efficient operation across different load states by maximizing torque in full-load and minimizing losses in semi-load, enhancing overall performance and efficiency.
Implementation Method 1
allowing for adjustable relative positions to optimize magnetic flux and torque based on load conditions
Data Source
AI summary
An electric machine, including a housing, a rotor which includes a rotor shaft and a rotor laminated core, and a stator which includes a stator laminated core. The stator laminated core includes grooves in which stator windings are received. A respective tooth of the stator laminated core is arranged between two respective grooves that are arranged adjacent to one another in a circumferential direction of the stator laminated core. An annular gap is configured between the rotor laminated core and the stator laminated core, and a tooth head ring is arranged in the annular gap, a respective recess of the tooth head ring arranged between two tooth arranged adjacent to one another in a circumferential direction of the tooth head ring. A relative position of the stator laminated core and the tooth head ring is adjustable to a first and second relative position.