Motor Rotor Tooth Groove Layout for Compact Axial Assembly
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Solution Overview
Problem
Conventional motor assemblies with pinion gears positioned outside the motor case result in increased size in the direction of the shaft, leading to larger motor and motor assembly dimensions.
Innovation Solution
A motor design featuring a stator with a vertically extending shaft, a rotatable rotor with a magnet and tooth groove on its outer surface, and a bearing system that supports the rotor, allowing for rotational output to be transmitted to a gear without the need for an external output transmission gear, thereby reducing the motor's axial size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pinion gear is disposed outside the motor case in the shaft extension direction, then the gear can mesh with the pinion gear for power transmission, but the size of the motor and motor assembly increases in the axial direction
Solution Approach 1:
The gear is integrated directly into the motor case structure, merging the gear component with the motor housing. This eliminates the need for a separate external gear assembly and reduces the axial length by consolidating functions into a single compact unit.
Solution Approach 2:
The gear teeth are formed on the radial outer surface of the motor case rather than extending axially outward. This dimensional repositioning allows power transmission to occur in the radial direction, thereby reducing the axial footprint of the motor assembly.
2Device complexity
If the tooth groove is provided on the radially outer surface of the case, then rotational output can be transmitted to a gear without external transmission gears, but the case structure becomes more complex
Solution Approach 1:
The tooth groove feature is incorporated directly into the motor case structure, combining the case with the gear transmission element. This integration eliminates separate transmission components while using standard manufacturing processes for forming grooves in cylindrical surfaces.
Solution Approach 2:
The tooth groove acts as an intermediary interface between the rotor's radial output and an external gear. By providing this mating feature on the case, the design enables power transmission without requiring complex external transmission mechanisms.
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
This configuration reduces the motor's size in the axial direction by eliminating the need for external gear transmission, enhancing compactness while maintaining effective rotational output and wear resistance through the use of different materials for the gear and tooth groove.
Implementation Method 1
The magnet is radially outward of the stator and opposes the stator in a radial direction
Data Source
AI summary
A motor includes a stator, a rotor, and a bearing. The stator includes a shaft that extends in a vertical direction. The rotor is rotatable around the shaft. The bearing supports the rotor in a rotatable manner. The rotor includes a magnet, a case, and a tooth groove. The magnet is radially outward of the stator and opposes the stator in a radial direction. The case covers a radially outer end of the magnet. The tooth groove is provided in a radially outer surface of the case.