Oscillating Motor With Elastic Element For Smooth Reciprocating Motion
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Solution Overview
Problem
Current oscillating motors for electric toothbrushes have unstable working frequencies, poor vibration effects, and complex structures that make them unsuitable for mass production, with the rotor's magnetic thrust becoming inefficient at large angles, leading to bumpy and difficult-to-maintain reciprocating movements.
Innovation Solution
A motor design with a stator-mounted coil assembly and a rotor with a permanent magnet structure, featuring separate upper and lower shells for easy installation and maintenance, and an elastic element for smooth reciprocating motion, ensuring a larger air-gap magnetic flux density and faster dynamic response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coils are arranged on the rotor, then the motor can generate rotational vibration effect, but the coils will loosen due to vibration and lead arrangement becomes difficult
Solution Approach 1:
The patent inverts the conventional arrangement by placing coils on the stator instead of the rotor. The rotor contains permanent magnets while the stator contains the coil assemblies. This inversion eliminates the loosening problem of coils on the vibrating rotor and simplifies lead arrangement since coils remain stationary.
2Ease of manufacture
If the enclosure is integrated with stator and rotor installed sequentially, then the motor structure is compact, but the installation and maintenance process becomes complicated and time-consuming
Solution Approach 1:
The patent divides the motor into separable components: the enclosure, the stator part (with coil assemblies), and the rotor part. The stator part can be independently installed into the enclosure, and the rotor part can be independently installed or replaced. This segmentation enables convenient maintenance without requiring complete disassembly of the motor.
3Ease of operation
If the rotor rotates to large angles under magnetic thrust, then the reciprocating swing motion is achieved, but the magnetic thrust efficiency decreases and the motion becomes bumpy
Solution Approach 1:
The patent introduces an elastic element that dynamically adjusts the rotor's motion. The elastic element stores and releases elastic potential energy, providing a restoring force that complements the magnetic thrust. This dynamic mechanism ensures smooth reciprocating swing motion even when the rotor rotates to larger angles, maintaining motion reliability.
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 a significantly larger output torque with improved reliability, reduced assembly and maintenance time, and lower costs due to its simple structure and convenient installation and detachment processes, while ensuring smooth reciprocating motion.
Implementation Method 1
the rotor part mainly rotates under the action of a magnetic thrust to generate an angle with the position under the stationary state thereof, then the current direction of the motor changes to change the direction of the magnetic thrust
Implementation Method 2
the rotor part includes an elastic element, one end of the elastic element is fixed by the enclosure, and the other end of the elastic element is connected with the rotor part
Data Source
AI summary
The present invention discloses a motor, including an enclosure, a rotor part and a stator part, wherein the stator part includes an upper coil assembly and a lower coil assembly, the rotor part includes an elastic element, the enclosure includes an upper shell and a lower shell, the upper shell is provided with an upper installation groove, the lower shell is provided with a lower installation groove, one end of the elastic element is fixed by the enclosure, and the other end thereof is connected with the rotor part. The stator and the rotor adopt upper and lower structures, thus being simple in structure and convenient to detach and install, the coils are arranged on the stator, the rotor is of a permanent magnet structure capable of providing a larger air-gap magnetic flux density, and the elastic element ensures very smooth reciprocating swing of the rotor part.