Magnetic Strain Wave Gear Rotor Assembly With Post-Inserted Magnets
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional magnetic strain wave gear devices face difficulties in efficiently assembling the high-speed rotor due to magnetic attraction forces, leading to low assembly efficiency and decreased energy conversion efficiency when attempting to narrow the gap between the rotor and stator.
Innovation Solution
The design includes a low-speed rotor end plate with rotor magnet passage holes allowing rotor magnets to be inserted after the high-speed rotor core is positioned, eliminating magnetic attraction forces during assembly and enabling narrower gaps for improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rotor magnets are pre-installed on the high-speed rotor before insertion into the stator, then the magnetic strain wave gear device can function properly, but magnetic attraction forces make accurate insertion difficult and assembly efficiency low
Solution Approach 1:
The assembly process is segmented into distinct phases: first inserting the high-speed rotor core without magnets, then separately inserting rotor magnets through passage holes in the end plate. This segmentation allows the rotor to be inserted without magnetic interference, and magnets are added afterward when no magnetic attraction opposes the insertion.
Solution Approach 2:
The high-speed rotor core is inserted into the stator before the rotor magnets are installed. This preliminary action of inserting the rotor body first, without magnets, eliminates magnetic attraction forces during the critical insertion phase, allowing for accurate positioning and alignment before the magnets are subsequently installed through the end plate passage holes.
2Ease of manufacture
If the gap between the high-speed rotor and stator is widened to improve assembly work, then assembly efficiency improves, but the energy conversion efficiency of the magnetic strain wave gear device decreases
Solution Approach 1:
By performing the preliminary action of inserting the rotor core without magnets, the patent enables the gap to be set to the optimal small value for energy efficiency. Without magnetic attraction forces during insertion, the rotor can be accurately positioned even with a minimal gap, thereby maximizing energy conversion efficiency while still allowing for practical assembly operations.
Solution Approach 2:
The patent changes the temporal parameter of magnet installation, delaying it until after rotor insertion. This parameter change allows the spatial parameter (gap size) to be optimized to a minimal value, because the harmful magnetic attraction forces are absent during the insertion phase, eliminating the need for a larger gap that would be required to overcome such forces.
3Loss of energy
If the gap between stator and rotor is narrowed to improve energy conversion efficiency, then energy conversion efficiency improves, but magnetic attraction forces make insertion even more difficult
Solution Approach 1:
The patent applies preliminary action by inserting the high-speed rotor core into the stator before installing the rotor magnets. This sequence allows the rotor to be positioned with high accuracy even when the gap is minimal, because no magnetic attraction forces are present during insertion to disrupt alignment. The magnets are subsequently installed through passage holes in the end plate, completing the assembly without compromising insertion accuracy.
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 assembly efficiency while maintaining or improving energy conversion efficiency by reducing magnetic attraction forces and narrowing the gap between stator and rotor magnets.
Implementation Method 1
it is difficult to magnetize the rotor magnets of the high-speed rotor through current conduction to stator windings after the high-speed rotor is inserted into the stator
Implementation Method 2
magnetic attraction forces are exerted between the permanent magnets of the stator and the rotor magnets of the high-speed rotor
Data Source
AI summary
Provided is a magnetic strain wave gear device that makes it possible to achieve both improvement of the efficiency of assembly work and suppression of decrease in energy conversion efficiency. A magnetic strain wave gear device includes: a stator having a stator core, a stator winding, and a stator magnet; a first rotor; and a second rotor. The second rotor includes a second rotor core provided with a plurality of rotor magnet insertion holes and a plurality of rotor magnets inserted into the plurality of respective rotor magnet insertion holes. The first rotor includes a cylindrical first rotor core and a first rotor end plate. The first rotor end plate has a rotor magnet passage hole through which the rotor magnets can be inserted into the rotor insertion holes from outside in a direction of a rotation shaft.