Magnetic Wave Gear Torque Constant Optimization
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Solution Overview
Problem
The magnetic wave gear device suffers from a reduced torque constant due to the increased length of the air gap between the stator and the high-speed rotor caused by the presence of the low-speed rotor, which affects its operational efficiency.
Innovation Solution
The configuration of the magnetic wave gear device is optimized by arranging the low-speed rotor, high-speed rotor, and stator in a concentric shape, with specific magnetic bodies and permanent magnets positioned to generate harmonically aligned magnetic flux, satisfying the relation Ns = Nl ± Nh, thereby improving the torque constant.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the low-speed rotor is present in the air gap between the stator and the high-speed rotor, then the magnetic wave gear device can achieve speed reduction, but the air gap length is increased and the torque constant is reduced
Solution Approach 1:
The patent applies nesting by placing the low-speed rotor inside the high-speed rotor, both within the air gap of the stator. This nested configuration allows the low-speed rotor to be positioned concentrically within the high-speed rotor, enabling speed reduction functionality while minimizing the overall air gap length between the stator and the outer high-speed rotor, thereby improving the torque constant
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 the torque constant of the magnetic wave gear device, improving its operational efficiency and reducing the air gap length, similar to that of a typical motor, thereby enhancing its performance.
Implementation Method 1
a high-speed rotor is rotated by a magnetomotive force of a coil provided for a stator
Implementation Method 2
a low-speed rotor that is an output shaft is rotated at a predetermined reduction ratio by a harmonic magnetic flux
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Provided is a magnetic wave gear device (1A) in which: a low-speed rotor (10) is disposed between a stator (30) and a high-speed rotor (20) and has first magnetic bodies (11) and first permanent magnets (12), magnetic poles of which face the same direction, alternately in a circumferential direction; the high-speed rotor has second magnetic bodies (21) and second permanent magnets (22), magnetic poles of which face the same direction as the first permanent magnets, alternately in the circumferential direction; the stator has third magnetic bodies (31) provided with slots (34) in which coils (33) can be wound, and third permanent magnets (32), magnetic poles of which face the same direction as the first permanent magnets, alternately in the circumferential direction; and a relationship of Ns=Nl±Nh is satisfied when Nl is the number of magnetic poles of the low-speed rotor, Nh is the number of pole pairs of the high-speed rotor, and Ns is the number of slots of the stator.