Oscillating Motor Torque and Current Optimization
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Solution Overview
Problem
Existing oscillating motors for electric clippers require high operating currents, especially during starting and stalling, and are not efficiently powered by rechargeable batteries due to insufficient torque, limiting their portability and battery life.
Innovation Solution
An oscillating motor design featuring a U-shaped magnetic yoke with alternating magnetic poles produced by coils and four permanently mounted magnets, allowing for efficient torque generation with reduced power consumption and stable current, eliminating the need for large currents during operation and enabling battery-powered operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a rotating motor with cam mechanism or eccentric link structure is used to generate oscillating motion, then oscillating motion can be achieved, but the operating current becomes huge especially during starting and stalling
Solution Approach 1:
The patent replaces the traditional mechanical transmission system (rotating motor + cam mechanism/eccentric link) with a direct oscillating motor structure. The oscillating motor generates oscillating motion directly through electromagnetic interaction between the swing arm and magnetic yoke, eliminating the need for mechanical conversion mechanisms. This substitution reduces operating current by avoiding the high current demands of mechanical transmission systems during starting and stalling.
Solution Approach 2:
The patent employs periodic electromagnetic excitation through coils that are sequentially energized to create alternating magnetic poles in the magnetic yoke. This periodic magnetic field generation drives the swing arm to oscillate back and forth. The periodic action principle allows the motor to maintain steady oscillating motion with lower current consumption compared to continuous rotation with mechanical conversion.
2Force
If the magnetic flux of support magnetic yokes is increased to ensure sufficient torque, then torque is improved, but the power consumption increases to 8-12 watts requiring 220V AC connection
Solution Approach 1:
The patent applies local quality by concentrating magnetic flux in specific regions where it is most effective. The magnetic yoke is designed with optimized flux paths that concentrate magnetic field lines between the swing arm and yoke surfaces, maximizing torque generation efficiency. This localized flux concentration allows sufficient torque to be generated with lower overall power consumption.
Solution Approach 2:
The patent optimizes magnetic circuit parameters including permeability, flux density, and air gap dimensions to maximize torque output per unit power. By carefully selecting and adjusting these parameters, the motor achieves high torque efficiency that enables operation from low-voltage rechargeable batteries rather than requiring high-power 220V AC connections.
3Speed
If a rotating motor is used with transmission mechanism, then oscillating motion can be generated, but the motor life is limited to about 400 hours due to high current during starting and stalling
Solution Approach 1:
The patent replaces the rotating motor with mechanical transmission system with a direct oscillating motor structure. This eliminates the mechanical wear and high current stress associated with cam mechanisms and eccentric links, significantly improving motor reliability and extending operational life beyond the 400 hours limitation of traditional systems.
4Force
If the middle support magnetic yoke has large magnetic flux, then attraction force is sufficient, but the structure becomes complex and requires 220V AC power connection
Solution Approach 1:
The patent segments the magnetic system into distinct components: a U-shaped magnetic yoke with optimized flux paths, a swing arm with permanent magnets, and sequential coil excitation. This segmentation allows each component to be optimized independently for its specific function, achieving sufficient attraction force with a simpler overall structure that can operate from low-voltage DC power sources.
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 motor achieves lower operating currents, longer battery life, and reduced noise, making it more energy-efficient and suitable for portable designs without the need for cam mechanisms or eccentric link structures.
Implementation Method 1
A motor is an electromagnetic device that converts electric energy based on the law of electromagnetic induction
Implementation Method 2
the radial end faces of the first and the second permanent magnet have opposite polarities and correspond the end face of the first support leg; the radial end faces of the third and the fourth permanent magnet have opposite polarities and correspond to the end face of the second support leg
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An oscillating motor and electric clippers, the oscillating motor comprising a U-shaped magnetic yoke (100), four permanent magnets (610, 620, 630, 640) and a swing arm (400). Under a control circuit (300), the U-shaped magnetic yoke (100) causes end faces (111, 121) of two support legs (110, 120) to produce alternating magnetic poles. The four permanent magnets (610, 620, 630, 640) are fixedly mounted to an inner arm (420) via a second magnetic yoke (500). The four permanent magnets (610, 620, 630, 640) are respectively a first permanent magnet (610), a second permanent magnet (620), a third permanent magnet (630), and a fourth permanent magnet (640), and are sequentially distributed on a same circumferenial surface taking a fulcrum as a circle centre. The polarities of radial end faces (611, 641) of the first permanent magnet (610) and the fourth permanent magnet (640) are the same. The polarities of radial end faces (621, 631) of the second permanent magnet (620) and the third permanent magnet (630) are the same, and the opposite of the polarity of the radial end face (611) of the first permanent magnet (610). When a coil is electrified, the four permanent magnets produce torque having the same direction of rotation, and thereby oscillate back and forth under the effect of the two support legs of the U-shaped magnetic yoke. The motor has greater torque than the existing motors having the same power, the acting magnetic flux is large, and the driving power is correspondingly reduced.