Rotor Magnet-Mounting Member With Temporary Hooking Tabs
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Solution Overview
Problem
Conventional methods for mounting permanent magnets in rotor claw-shaped magnetic poles face difficulties in installing reinforcing members without interfering with the magnets, leading to potential magnetic flux leakage and performance degradation.
Innovation Solution
The use of magnet-mounting members with a C-shaped cross section and hooking tabs that can be temporarily disabled to facilitate easy installation, preventing displacement of permanent magnets and ensuring reliable fixation against claw-shaped magnetic poles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If reinforcing members with magnet-retaining structure are installed after permanent magnets are fitted, then permanent magnets can be fixed reliably, but installation becomes difficult due to interference between magnet-retaining structure and permanent magnets
Solution Approach 1:
The patent applies preliminary action by disabling the magnet-retaining function of hooking tabs before installing the reinforcing member. The hooking tabs are bent outward in advance to create a non-retaining state, allowing the reinforcing member to be installed without interfering with the permanent magnets. After installation, the hooking tabs are restored to their original position to enable the magnet-retaining function, thus achieving both easy installation and reliable fixation.
2Ease of manufacture
If reinforcing members are installed after permanent magnets are affixed to them, then installation is easier, but gaps are created between permanent magnets and claw-shaped magnetic pole sides, causing magnetic flux leakage
Solution Approach 1:
The patent applies preliminary action by positioning the permanent magnets on the claw-shaped magnetic poles before installing the reinforcing members. The magnets are affixed to the magnetic pole sides in advance, ensuring proper positioning and eliminating gaps. The reinforcing members are then installed with their hooking tabs disabled to avoid interference, and finally the hooking tabs are restored to retain the magnets, thus achieving both easy installation and prevention of magnetic flux leakage.
3Reliability
If hooking tabs are in original state during installation, then permanent magnets are prevented from displacement, but installation of magnet-mounting members becomes difficult
Solution Approach 1:
The patent applies dynamics by making the hooking tabs changeable between two states: a disabled state during installation and an enabled state during operation. The hooking tabs are bent outward to a non-retaining position before installation, allowing easy mounting of the magnet-mounting members. After installation, the tabs are restored to their original inward position to enable the magnet-retaining function, thus achieving both easy installation and prevention of magnet displacement through state change.
Data Source
AI summary
A magnet-mounting member for holding permanent magnets against side faces of each claw-shaped magnetic pole has pairs of extreme-end and basal-end hooking tabs for preventing displacement of the permanent magnets in either a basal-end or extreme-end direction. The magnet-mounting member is configured such that a function of the basal-end hooking tabs to prevent displacement of the permanent magnets can be disabled by deforming the basal-end hooking tabs. When the magnet-mounting member is forced onto the claw-shaped magnetic pole, the basal-end hooking tabs go into contact with the permanent magnets and deform outward, whereby the magnet-retaining function of the basal-end hooking tabs is disabled. When the magnet-mounting member has been fully pushed onto the claw-shaped magnetic pole, the basal-end hooking tabs resume an original shape to prevent the permanent magnets from being displaced in either direction.