Maglev Brush Motor Structure for Radial and Axial Toothbrush Motion
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Solution Overview
Problem
Existing electric toothbrush motors rely on springs or torsion bars, which are prone to damage, have low bearing capacity, and limited torque transmission, and lack axial telescoping functionality, resulting in unstable performance and inadequate all-around cleaning.
Innovation Solution
A bidirectional magnetic levitation brush motor device utilizing electromagnetic effects for movement transmission, eliminating the need for elastic structures and incorporating a commutator and electric brush needles to achieve radial and axial movement, enhancing safety and cleaning efficacy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If springs or torsion bars are used for movement transmission, then the motor can achieve radial swinging motion, but the service life is reduced due to damage of elastic structures and the torque transmission per unit volume is limited
Solution Approach 1:
The patent extracts and removes the elastic structures (springs and torsion bars) from the motor system. By eliminating these prone-to-damage components, the invention achieves indefinite service life for the motor while maintaining the radial swinging function through electromagnetic actuation alone.
Solution Approach 2:
The patent replaces the mechanical elastic structure system with an electromagnetic actuation system. The electromagnetic force directly drives the radial swinging motion, eliminating the need for springs and torsion bars, thereby increasing torque transmission capability and service life.
2Power
If springs or torsion bars are used for movement transmission, then the motor can achieve radial swinging motion, but the torque transmission per unit volume is small
Solution Approach 1:
The patent replaces the mechanical elastic structure system with an electromagnetic actuation system. The electromagnetic force directly drives the radial swinging function, eliminating the need for springs and torsion bars, thereby increasing torque transmission capability and service life.
Solution Approach 2:
The patent segments the motor into independent functional modules: electromagnetic actuation system, magnetic levitation bearing system, and brushless commutation system. This modular segmentation allows each component to be optimized for its specific function, maximizing torque transmission efficiency per unit volume.
3Adaptability or versatility
If only radial swinging motion is provided, then the motor structure is simple, but the cleaning effect is insufficient without axial telescoping function
Solution Approach 1:
The patent designs the motor to perform multiple functions: it provides both radial swinging motion and axial telescoping motion using the same electromagnetic actuation system. This multi-functionality enables comprehensive cleaning coverage while avoiding the need for separate mechanical mechanisms for each motion type.
Solution Approach 2:
The patent implements dynamic control of the electromagnetic actuation system to produce different motion patterns. By dynamically adjusting the electromagnetic force vectors, the motor can switch between radial swinging and axial telescoping modes, adapting to different cleaning requirements.
4Reliability
If elastic structures are used for movement transmission, then the motor can achieve swinging motion, but the bearing capacity is low and performance is unstable under different loads
Solution Approach 1:
The patent replaces the mechanical elastic structure system with an electromagnetic actuation system. The electromagnetic force directly drives the radial swinging function, eliminating the need for springs and torsion bars, thereby increasing torque transmission capability and service life.
Solution Approach 2:
The patent changes the fundamental operating parameter from mechanical elastic deformation to electromagnetic force generation. This parameter change enables the motor to maintain stable performance across different load conditions, as electromagnetic force can be precisely controlled and adjusted in real-time.
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 solution extends the motor's service life, increases torque transmission per unit volume, and enables stable, all-around cleaning with radial and axial movement, improving the safety and effectiveness of electric toothbrushes.
Implementation Method 1
the coil windings are wound around outer sides of the rotor teeth; and four placing grooves are formed, the four placing grooves are symmetrically distributed about a bisector of the rotor core
Implementation Method 2
Movement transmission is achieved by means of an electromagnetic effect
Implementation Method 3
Bidirectional magnetic levitation brush motor device
Implementation Method 4
self-attraction surfaces and non-self-attraction surfaces are formed by the magnetic steel and the rotor core
Data Source
AI summary
Disclosed herein is a bidirectional magnetic levitation brush motor device, including a motor housing, a motor shaft and an end cover, wherein the end cover is arranged at a bottom end of the motor housing, shaft holes are formed in axes of the motor housing and the end cover, the motor shaft is arranged between the two shaft holes, bearings are arranged at junctions of the motor shaft with the motor housing and the end cover, the end of the motor shaft that is away from the end cover extends out of the motor housing, and a transmission connection shaft is arranged at a top end of the motor shaft. With regard to the present invention, movement transmission is achieved by means of an electromagnetic effect, and mounting of elastic structures such as a torsion bar and the like is no longer needed.