Circular Linear Stator Layout for Magnet-Free Rotational Motors

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Solution Overview

Problem

Existing linear motor technologies are limited to translational movement and do not efficiently facilitate rotational movement of non-magnetic conductive rotors without the use of permanent magnets.

Innovation Solution

A rotational linear motor drive system utilizing a circular configuration of linear stator groups on either side of a non-magnetic conductive rotor, driven by three-phase electrical input, where the frequency of the input waveform controls the rotor's speed, and the induced current produces a magnetic field opposing the stator field to achieve rotational motion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If linear motors are used for translational movement, then movement efficiency is improved, but rotational movement capability is lost

Engineering Contradiction:

Improverotational speedVSAvoidmovement type capability

Core Design Contradiction:

SpeedVSAdaptability or versatility

Solution Approach 1:

The patent applies curvature by arranging linear stator groups in a circular configuration around a central rotor, transforming the linear motor structure into a rotational system. The stator groups are positioned at different angular positions (e.g., 0°, 120°, 240° for three-phase) to create a rotating magnetic field that drives the rotor in circular motion, thus achieving rotational movement capability while maintaining linear motor efficiency

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The invention transitions from one-dimensional linear movement to two-dimensional rotational movement by adding angular positioning of stator groups around the rotor. This dimensional change allows the motor to produce torque and achieve rotational speed while maintaining the efficient electromagnetic interaction characteristics of linear motors

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Force

If permanent magnets are used to achieve rotational movement, then torque production is improved, but device complexity and cost increase

Engineering Contradiction:

ImprovetorqueVSAvoidmotor structure

Core Design Contradiction:

ForceVSDevice complexity

Solution Approach 1:

The patent extracts and eliminates permanent magnets from the motor structure, replacing them with electromagnets (stator groups with windings). The stator groups generate magnetic fields through controlled electrical currents, producing torque on the conductive rotor without requiring permanent magnets, thus simplifying the structure and reducing cost while maintaining torque production capability

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The invention substitutes the magnetic field generation mechanism from permanent magnets (passive magnetic field) to electromagnets (active controlled magnetic field). This allows dynamic control of torque through electrical input, replacing the fixed magnetic properties of permanent magnets with controllable electromagnetic fields generated by the stator windings

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If stator groups are arranged in circular configuration, then rotational movement is enabled, but manufacturing complexity increases

Engineering Contradiction:

Improverotational capabilityVSAvoidstator arrangement

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent divides the stator into multiple independent stator groups (e.g., three stator groups for three-phase operation) positioned at different angular positions around the rotor. Each stator group can be manufactured and assembled separately, then positioned at predetermined angular intervals (e.g., 120° apart), simplifying the manufacturing process compared to creating a fully integrated circular stator structure

Inventive Principle:

Principle #1Segmentation

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 enables increased torque and speed proportional to input voltage, allowing for rotational movement without permanent magnets, enhancing the motor's efficiency and versatility.

Implementation Method 1

The magnetic field produced by the stator windings will create an opposite corresponding current and associated magnetic field in the non-magnetic conductive rotor, causing it to spin. The induced current will produce a magnetic field opposing the change in magnetic flux in the stator windings.

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

The magnetic field produced by the stator windings will create an opposite corresponding current and associated magnetic field in the non-magnetic conductive rotor, causing it to spin.

Methodology Applied

Scientific EffectLorentz force: Lorentz Force

Data Source

PatentUS20240396415A1Rotational Linear Motor

Publication Date: 2024.11.28 JONES DANIEL PATRICK

AI summary

The invention relates to a rotational linear motor drive system for the acceleration of a rotational shaft. The rotational linear motor drive system comprises a stator, with at least two stator elements, arranged on either side of a non-magnetic conductive rotor. Each stator maybe connected to its own energy source or may be connected in series to a single energy source. The rotor can operate at the same time with the two synchronized stator groups, or the rotor may be driven out of phase by each stator group. No permanent magnets are used in the design of the motor.