Battery-Powered Hair Clipper Pivot Motor With Stable Magnet Retention
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Solution Overview
Problem
Conventional pivot motors used in hair clippers are not suitable for battery power, and they face issues with magnets becoming dislodged due to magnetic forces, leading to inefficiencies and reduced performance.
Innovation Solution
A battery-powered pivot motor design with a shorter axial length, thicker gauge wire, and a redesigned pivot arm that encapsulates magnets and adjusts voltage using a sensor for optimal cutting power, addressing the magnet dislodgment issue and improving efficiency across varying hair densities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional pivot motors are used in battery-powered clippers, then the motor can provide sufficient cutting power, but the motor axial length becomes too long (40mm) for compact battery-powered design
Solution Approach 1:
The patent changes key parameters of the pivot motor: reducing axial length from 40mm to 23-27mm, increasing wire gauge thickness to compensate for shorter length, and adjusting magnet strength to maintain cutting power despite compact dimensions. These parameter changes enable the motor to fit battery-powered clippers while maintaining sufficient cutting performance.
2Device complexity
If magnets are directly attached to the flux bridge using glue or heat staking, then the motor structure is simple, but the magnets become dislodged due to magnetic forces during operation
Solution Approach 1:
The patent applies preliminary anti-action by designing the pivot arm to pre-compress the magnets against the flux bridge before operation begins. This continuous compressive force counteracts the magnetic forces that would otherwise cause the magnets to slide off during motor operation, preventing magnet dislodgment without requiring complex retention structures.
3Length of moving object
If the pivot motor is designed for battery power with shorter axial length, then the motor fits compact clippers, but the wire gauge must be thicker to compensate for reduced length and maintain power output
Solution Approach 1:
The patent compensates for the reduced axial length by increasing the wire gauge thickness in the coil winding. This parameter change increases the electrical conductivity and power generation capability of the shorter motor, maintaining sufficient cutting power despite the compact 23-27mm axial length required for battery-powered clipper integration.
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
The battery-powered pivot motor achieves efficient cutting power at lower voltages, maintains magnet stability, and automatically adjusts voltage for increased load conditions, providing consistent performance with reduced power consumption.
Implementation Method 1
A stator located adjacent the magnetic assembly produces magnetic flux that drives the armature back and forth
Implementation Method 2
the force between the magnets and the laminations can cause the magnets to slide off the flux bridge
Data Source
AI summary
A pivot motor for a hair clipper is provided, including a stator with a plurality of laminations, a bobbin located in operational relation to the stator and having a coil of wire wound around the bobbin, an armature being configured for driving a hair clipper moving blade at one end, and having at least one magnet at an opposite end, the armature having a pivot point, and the motor being configured for operation between 2.5 and 4.2 Volts.