Planetary Push-Pull Electric Motor Eliminates Gearbox Backlash
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Solution Overview
Problem
Conventional electric motors require gearboxes to achieve desired speed and torque, which increase assembly length, weight, noise, and cost, while being inefficient.
Innovation Solution
A planetary push-pull electric motor (PPPEM) with a stator and eccentrically mounted planetary rotor, utilizing radial electromagnets to generate push-pull magnetic forces for continuous rolling motion, eliminating the need for gearboxes by directly transferring rotation to an output shaft with zero backlash.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a gearbox is connected to the electric motor to reduce speed and increase torque, then the desired speed and torque are achieved, but the assembly length and diameter increase
Solution Approach 1:
The patent merges the motor and gearbox functions into a single integrated unit. The planetary rotor mechanism is built directly into the motor structure, eliminating the need for a separate external gearbox. This integration achieves both speed reduction and torque multiplication while maintaining a compact assembly size.
Solution Approach 2:
The patent employs a nested structure where the planetary rotor is positioned within the stator assembly. The planetary rotor orbits within the stator while simultaneously rotating on its own axis, creating a compact nested arrangement that achieves gear reduction without increasing overall assembly dimensions.
2Force
If a gearbox is connected to the electric motor, then speed reduction and torque increase are achieved, but the weight increases
Solution Approach 1:
By combining the motor and gear reduction mechanism into one unit, the patent eliminates the weight of separate gearbox components. The planetary rotor mechanism uses the motor's own magnetic field and structure to achieve torque multiplication, rather than adding a separate heavy gearbox assembly.
3Speed
If a gearbox is connected to the electric motor, then speed control is achieved, but noise increases
Solution Approach 1:
The patent replaces traditional mechanical gear engagement with a magnetic field-based planetary rotor system. The planetary rotor is magnetically attracted and repelled by the stator's magnetic poles, creating smooth motion control without the mechanical impact and noise associated with traditional gear teeth engagement.
4Force
If a gearbox is connected to the electric motor, then torque is increased, but the device complexity increases
Solution Approach 1:
The patent combines the motor and gear reduction into a single integrated mechanism, reducing the number of separate components and assemblies. The planetary rotor serves both as the motor's moving component and as the gear reduction element, simplifying the overall device structure.
Solution Approach 2:
The planetary rotor performs multiple functions simultaneously: it acts as the motor's rotor, provides speed reduction through its orbital motion, and generates torque multiplication. This multi-functionality reduces the need for separate dedicated components for each function.
5Force
If a gearbox is connected to the electric motor, then torque is increased, but efficiency decreases
Solution Approach 1:
The patent replaces mechanical gear transmission with a magnetic field-based system. The planetary rotor is driven directly by magnetic attraction and repulsion forces from the stator, eliminating mechanical friction, tooth engagement losses, and other inefficiencies associated with traditional gearbox 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
The PPPEM provides efficient power output with reduced size, weight, noise, and cost, while maintaining high torque and flexibility in speed control, overcoming the limitations of traditional motor designs.
Implementation Method 1
a series of electromagnets radially mounted about said ring stator centerline for generating radial magnetic force upon the magnetic fields of said planetary rotor when said series of electromagnets is activated
Implementation Method 2
based on the interaction, when operated, between a stator, configured with a series of electromagnets arranged radially around the stator axis, and a planetary rotor
Implementation Method 3
The electromagnetic interaction between these two elements produces S-shaped magnetic lines which are then induced to be straightened, and the resultant semi-tangential vector results in the production of rotational moment
Data Source
Figure 1
Figure 2A
Figure 2B
AI summary
A planetary push-pull electric motor comprising a ring stator fixedly mounted on the central axis of the planetary push-pull electric motor; a planetary rotor arranged to be magnetically movable around an inner circumference of the ring stator, the planetary rotor rotatably mounted on an eccentric rotor axis in respect to the central axis of the ring stator; a series of electromagnets radially mounted about the ring stator for generating magnetic fields; and a means for transferring rotation of the eccentric planetary rotor axis to directly power an output shaft, wherein when the series of electromagnets are activated, the planetary rotor is magnetically impelled to pivot and roll from one temporary, moving contact line to an adjacent one, creating a rotary moment upon each of the temporary, moving contact lines, providing a power output.