Synchronous Reluctance Rotor Core Hollow Part Width Optimization
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Solution Overview
Problem
Synchronous reluctance type rotary electric machines face challenges in maximizing rotational torque due to decreased magnetic flux density as flux approaches the shaft, leading to potential magnetic saturation and rotor core deformation at high speeds.
Innovation Solution
The rotor core design includes multi-layered hollow parts with specific width settings (W1≤W2) to facilitate uniform magnetic flux distribution and prevent deformation, using a stud bolt through strategically positioned hollow parts to restrict displacement and enhance torque stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the interval between two hollow parts of the rotor core is set to be larger as the interval is closer to the shaft, then magnetic saturation is prevented at portions close to the shaft, but magnetic flux density decreases as magnetic flux moves closer to the shaft
Solution Approach 1:
The patent applies local quality by setting different interval widths between hollow parts at different radial positions. Specifically, the interval width increases as the position approaches the shaft center, creating locally optimized magnetic flux distribution. This non-uniform interval configuration allows each region of the rotor core to have appropriate magnetic flux density, preventing saturation near the shaft while maintaining adequate flux density in outer regions.
2Reliability
If hollow parts are formed in a rotor core, then magnetic flux distribution is improved, but the rotor core tends to be deformed
Solution Approach 1:
The patent applies parameter changes by carefully controlling the width parameters of hollow parts and their intervals. By optimizing these geometric parameters, the patent achieves uniform magnetic flux distribution while maintaining rotor core structural integrity. The specific parameter settings ensure that the rotor core can withstand high-speed rotation without excessive deformation, thus resolving the contradiction between magnetic flux distribution improvement and structural stability.
3Power
If the rotor core is rotated at high speed, then rotational torque is increased, but the rotor core will be deformed due to centrifugal force
Solution Approach 1:
The patent applies preliminary action by pre-configuring the hollow parts with specific width settings and interval distributions before the rotor core operates at high speed. This preliminary structural design creates a rigid yet flux-optimized rotor core that can resist centrifugal forces during high-speed rotation. The pre-established geometric parameters ensure that the rotor core maintains its shape and does not deform excessively under centrifugal loading, thereby enabling high-speed operation with stable torque characteristics.
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 improves rotational torque efficiency by ensuring magnetic flux flows uniformly and reduces rotor core deformation during high-speed operation, stabilizing torque characteristics and minimizing vibration and noise.
Implementation Method 1
a direction in which magnetic flux easily flows and a direction in which magnetic flux does not easily flow are formed in the rotor core. Thus, the synchronous reluctance type rotary electric machine rotates the shaft using a reluctance torque generated by the hollow parts.
Implementation Method 2
the synchronous reluctance type rotary electric machine rotates the shaft using a reluctance torque generated by the hollow parts
Implementation Method 3
when the rotor core is rotated at a high-speed, there is a likelihood that the rotor core will be deformed due to a centrifugal force generated by the high-speed rotation
Data Source
AI summary
A synchronous reluctance type rotary electric machine of an embodiment includes a shaft and a rotor core. The shaft rotates around a rotation axis. The rotor core is fixed to the shaft and includes multi-layered hollow parts having a convex shape toward a radially inward side formed for each pole in cross section. Then, when a center in a circumferential direction of one pole is a pole center, a hollow part closest to the shaft among the plurality of hollow parts is a first hollow part, a hollow part positioned next to the first hollow part is a second hollow part, and a hollow part positioned on a side opposite to the first hollow part with respect to the second hollow part is a third hollow part, a width W1 between the first hollow part and the second hollow part on the pole center and a width W2 between the second hollow part and the third hollow part on the pole center are set to satisfy W1≤W2.