Magnetic Transmission Assembly Variable Speed Integration
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Solution Overview
Problem
Conventional transmission devices, including mechanical and magnetic types, face challenges in achieving high drive power density due to their heavy weight and noise levels, making them unsuitable for electric vehicles that require efficient torque and speed variations.
Innovation Solution
A magnetic transmission assembly comprising a rotor, stator, and a magnetically conductive element with adjustable steel pieces and pole pairs, allowing for variable-speed ratios and integration into electric motors for reduced volume and weight, enhancing drive power density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a mechanical transmission device is used, then torque conversion and transmission are achieved, but the weight is heavy and noise level is high
Solution Approach 1:
The patent replaces the mechanical gear transmission system with a magnetic field-based transmission system. The magnetic transmission device uses magnetic poles and magnetic flux to achieve torque conversion without mechanical contact, thereby eliminating the weight and noise problems associated with mechanical gears while maintaining the torque conversion function.
Solution Approach 2:
The patent changes the transmission mechanism from mechanical parameter-based (gear teeth, meshing) to magnetic parameter-based (magnetic pole distribution, magnetic flux density). By controlling the number and distribution of magnetic poles, the system achieves variable speed ratios without the physical constraints of mechanical gear dimensions.
2Object-affected harmful factors
If an ordinary magnetic transmission device is used, then vibration and noise level are reduced, but the weight cannot be reduced
Solution Approach 1:
The patent segments the magnetic transmission system into modular components: a stator with multiple magnetic poles, a rotor with corresponding poles, and independent control circuits for each phase. This segmentation allows for optimized material usage and reduced overall weight while maintaining the vibration and noise reduction benefits of magnetic transmission.
Solution Approach 2:
The magnetic transmission device is designed to perform multiple functions: torque conversion, variable speed ratio adjustment, and direct integration with the motor structure. By combining the transmission function with the motor structure, the system eliminates the need for separate heavy transmission components, achieving weight reduction while maintaining low vibration and noise characteristics.
3Adaptability or versatility
If the motor is combined with a transmission device, then different output torques and travel speeds are achieved, but the overall drive power density is difficult to improve due to heavy total weight
Solution Approach 1:
The patent merges the transmission device directly into the motor structure, forming an integrated motor-transmission unit. The magnetic transmission components are incorporated within the motor housing, sharing common structural elements and magnetic circuits. This integration eliminates the weight of separate transmission housings and mounting structures, thereby improving drive power density while maintaining the ability to provide different output torques and speeds through magnetic pole control.
4Adaptability or versatility
If the number of steel pieces in the magnetically conductive element is increased, then more pole pairs can be formed, but the device complexity and weight increase
Solution Approach 1:
The patent implements a dynamic configuration where the number of active steel pieces in the magnetically conductive element can be adjusted during operation. By selectively energizing different phases and controlling the magnetic poles, the system can vary the number of effective pole pairs without physically reconfiguring the entire structure. This dynamic control achieves multiple speed ratios while maintaining a fixed, simplified physical structure.
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 magnetic transmission assembly achieves a high drive power density by enabling efficient torque and speed variations while reducing weight and noise, making it suitable for electric vehicles with improved performance and efficiency.
Implementation Method 1
the magnetically conductive element selectively makes PN1 or PN2 steel pieces correspond to the rotor and the stator
Implementation Method 2
The induction coils are energized to form the poles
Data Source
AI summary
A magnetic transmission assembly is adapted to integration with a motor or generator. The magnetic transmission assembly includes a rotor, a stator, and a magnetically conductive element. The rotor and the stator are sleeved coaxially and respectively have R and ST1 pole pairs. The magnetically conductive element is located between the rotor and the stator, and has steel pieces. When the magnetically conductive element is actuated, the magnetically conductive element selectively enables PN1 or PN2 steel pieces to be corresponding to the rotor and the stator. The steel pieces corresponding to the rotor and the stator interact with magnetic fields of the R and ST1 pole pairs to generate a predetermined variable-speed ratio. The magnetic transmission assembly can be integrated into the motor, so as to improve the drive power density.