Dual Axis Motor Torque Control via Segmented Rotors
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Solution Overview
Problem
Conventional motors face limitations in providing bursts of higher torque without saturating the magnetic core, which can lead to overheating or stalling, especially when starting torque requirements exceed running torque demands, such as in stuck or difficult-to-move conditions like frozen materials or flat tires.
Innovation Solution
A dual axis motor design incorporating a planetary gear system with two motor components and a controller that independently manages magnetic fields and braking to deliver enhanced starting torque by sequencing the rotation of outer and inner rotors and applying brakes to increase torque output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the motor is driven to achieve bursts of torque, then the torque output is increased, but the magnetic core becomes saturated and the motor may overheat or stall
Solution Approach 1:
The motor is divided into two separate motor components (first motor component and second motor component) with independent magnetic fields and control circuits. This segmentation allows each component to operate within its safe torque limits while their combined output through the planetary gear system achieves the required burst torque without saturating either magnetic core individually.
Solution Approach 2:
The planetary gear system is nested within the motor assembly, with the sun gear connected to one motor component and planet gears connected to the other motor component. This nested configuration allows the gear system to multiply the combined torque output of both motor components, achieving high burst torque without requiring either motor component to operate beyond its safe limits.
2Device complexity
If a single motor component is used, then the device complexity is reduced, but the starting torque capability is insufficient for difficult-to-move conditions
Solution Approach 1:
Two motor components are merged into a single integrated motor assembly with a shared planetary gear system and common output shaft. This merging allows the combined torque output of both motor components to be transmitted through a single gear system, achieving high starting torque capability while maintaining a compact, integrated structure rather than using two separate motors.
Solution Approach 2:
The planetary gear system provides mechanical advantage by transforming the torque output from the two motor components. The gear ratio multiplies the combined torque, effectively adding a dimensional transformation that converts moderate torque from two components into high burst torque at the output shaft.
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 dual axis motor effectively provides significantly higher starting torque than individual components, preventing overheating and stalling, while maintaining efficient cooling and extended operational capabilities through coordinated control of magnetic fields and braking.
Implementation Method 1
The coils in the stator of the motor generate a magnetic field that provides a force to magnets or other currents in the rotor of the motor
Implementation Method 2
The brake is applied to the outer motor or the inner motor to provide braking torque to the rotor
Data Source
AI summary
A dual axis motor a first epicyclic gear, a second epicyclic gear, a rim gear, an inner rotor, an outer rotor, a brake and a stator assembly. The second epicyclic gear is operative to mesh with the first epicyclic gear and move in around the first epicyclic. The inner rotor is fixedly connected to the first epicyclic gear. The outer rotor fixedly is connected to the second epicyclic gear. The stator assembly spaced from the inner rotor by a first gap and spaced from the outer rotor by a second gap. The motor provides a resultant torque to driven device. The resultant torque is provided by the inner rotor, outer rotor, the brake, or by sudden deceleration of one or more elements within the dual axis motor. The gear ratio provided by the first and second epicyclic gear allow for an enhanced speed range while providing high starting torque.