Integrated Motor Housing and Reducer to Simplify Drive Wiring
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Solution Overview
Problem
The complexity of electrical wirings and structure increases when the electrical power converter and electric motor are separated in electric drive devices, leading to a more intricate system.
Innovation Solution
An electric drive device with an electric motor and speed reducer are integrally formed, where the motor housing receives the rotor, stator, and electrical power converter, simplifying the structure by housing the electrical wirings within the motor housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the electrical power converter and electric motor are separated, then the electrical power converter can be independently positioned, but the electrical wirings become complicated and the structure becomes more complex
Solution Approach 1:
The patent merges the electrical power converter and electric motor into a single integrated unit where the converter is housed within the motor housing. This combination eliminates the need for separate electrical wirings between two independent components, thereby reducing structural complexity while maintaining the ability to position the integrated unit as a whole.
2Ease of manufacture
If the electrical power converter and electric motor are separated, then each component can be optimized independently, but the overall structure becomes more complex
Solution Approach 1:
The converter housing is integrated within the motor housing to form a unified structure. This merging allows both components to be manufactured as a single assembly, simplifying the overall structure while enabling independent optimization of each component's design within the integrated framework.
3Device complexity
If the electrical power converter is housed within the motor housing, then the structure is simplified and wiring is reduced, but the motor housing must accommodate additional components
Solution Approach 1:
The electrical power converter is nested within the motor housing, with the converter housing positioned inside the motor housing space. This nesting arrangement allows the converter to be housed within the existing motor housing volume without requiring additional external space, thereby simplifying the overall structure while accommodating additional components.
Data Source
AI summary
An electric drive device includes an electric motor and a speed reducer. The electric motor includes a rotor, a stator, an electrical power converter and a motor housing. The electrical power converter is electrically connected to stator windings of the stator and is configured to supply an electric current to the stator windings. The motor housing receives the rotor, the stator and the electrical power converter. The speed reducer includes: a motor-side rotatable body that is coupled to a shaft of the rotor; and a drive-side rotatable body. The speed reducer is configured to reduce a rotational speed of the drive-side rotatable body relative to a rotational speed of the motor-side rotatable body. The motor housing and the speed reducer are integrally formed together.