Magnetless DC Induction Motor Using Stator Coil and Air Gap

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Solution Overview

Problem

Conventional motors rely on costly permanent magnets, such as Neodymium, which increase production costs and require components like slip rings and brushes for electrical power transfer, posing drawbacks in efficiency and maintenance.

Innovation Solution

A magnet-less electromagnetic motor design utilizing a stator and rotor with air gaps, where a periodic magnetic field induces a current in the rotor ring, allowing for rotation without permanent magnets and eliminating the need for slip rings through inductive or capacitive non-contact power transfer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If permanent magnets like Neodymium are used in motors, then motor performance is improved, but production cost and material cost increase significantly

Engineering Contradiction:

Improvemotor performanceVSAvoidproduction cost

Core Design Contradiction:

PowerVSEase of manufacture

Solution Approach 1:

The patent removes permanent magnets from the motor system entirely, extracting the costly component while maintaining motor functionality through an alternative electromagnetic induction mechanism where the stator coil generates a periodic magnetic field to induce current in the rotor ring

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent replaces expensive permanent magnets with a cost-effective electromagnetic field generation system using standard coils and conductive materials, significantly reducing material costs while achieving comparable motor performance

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Use of energy by moving object

If slip rings and brushes are used for electrical power transfer, then power transfer is achieved, but efficiency decreases and maintenance requirements increase

Engineering Contradiction:

Improveelectrical power transferVSAvoidmaintenance requirement

Core Design Contradiction:

Use of energy by moving objectVSReliability

Solution Approach 1:

The patent replaces the mechanical contact-based slip ring and brush system with a non-contact electromagnetic induction system, where power is transferred inductively or capacitively to the rotor, eliminating mechanical wear and improving reliability

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces an air gap as an intermediary medium between the stator and rotor, enabling non-contact power transfer through electromagnetic fields while maintaining the necessary magnetic coupling for motor operation

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If permanent magnets are used in motors, then motor operation is achieved, but material cost increases

Engineering Contradiction:

Improvemotor operationVSAvoidmaterial cost

Core Design Contradiction:

Ease of operationVSQuantity of substance

Solution Approach 1:

The patent extracts permanent magnets from the motor design, eliminating the need for rare earth materials like Neodymium while maintaining full motor operational capability through electromagnetic induction

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the fundamental operating parameters from permanent magnet-based magnetic field generation to electromagnetic induction-based field generation, allowing motor operation without costly permanent magnet materials

Inventive Principle:

Principle #35Parameter changes

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 design achieves efficient, cost-effective motor operation with high torque at various RPMs, reducing material costs and enhancing reliability by eliminating the need for slip rings and brushes, while enabling regenerative braking and energy recirculation.

Implementation Method 1

a periodic magnetic field induces a current in the rotor ring, allowing for rotation

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a periodic current is induced in the rotor ring. The current flowing through the portion of the rotor ring disposed in the air gap flows in a first direction to rotate the rotor

Methodology Applied

Scientific EffectLorentz force: Lorentz Force

Data Source

PatentUS10097070B1DC induction motor with stator coil driven by a unidirectional field current

Publication Date: 2018.10.09 COLERIDGE DESIGN ASSOCIATES LLC

AI summary

A motor is disclosed. The motor includes a stator with a stator coil to generate a periodic magnetic field and a rotor. An air gap is disposed between the stator and the rotor. The rotor has at least one rotor ring, a portion of the rotor ring is disposed in the air gap. Due to the magnetic field, a periodic current is induced in the rotor ring. The current flowing through the portion of the rotor ring disposed in the air gap flows in a first direction to rotate the rotor relative to the stator.