Cross-interlocked DC Machine Auxiliary Excitation Control

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Solution Overview

Problem

Conventional switched DC electric machines with conduction rings and brushes require individual electromechanical control units due to the lack of a efficient means for variable excitation, limiting their operational flexibility.

Innovation Solution

The integration of auxiliary excitation winding sets between two DC electric machines allows for variable excitation by altering the current of the magnetic field winding sets, enabling cross-interlocked operation and shared control through serial or parallel connections.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional switched DC electric machines use individual electromechanical control units with Hall elements for sensing locations, then each machine can operate independently, but the system complexity increases and operational flexibility is limited

Engineering Contradiction:

Improveoperational flexibilityVSAvoidcontrol unit quantity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent merges the control functions of multiple DC electric machines by connecting auxiliary excitation winding sets between machines. The auxiliary excitation winding set of one machine is connected in series with the magnetic field winding set of another machine, allowing shared control through a single control unit instead of requiring individual control units for each machine.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The auxiliary excitation winding sets enable a single control unit to universally control multiple DC electric machines. By altering the current of magnetic field winding sets through the auxiliary excitation windings, one control unit can adjust the operational characteristics of multiple machines, making the control system multi-functional.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If auxiliary excitation winding sets are connected in series between DC electric machines, then variable excitation is enabled and operational flexibility improves, but the device structure becomes more complex

Engineering Contradiction:

Improvevariable excitation capabilityVSAvoidwinding connection structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The auxiliary excitation winding sets serve as intermediary elements between DC electric machines. These windings act as mediators that transfer and regulate current between machines, enabling variable excitation control while simplifying the overall connection structure compared to direct machine-to-machine control connections.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Extent of automation

If Hall elements are used for sensing locations in conventional machines, then switch timing can be determined, but the system requires more components and has reliability issues

Engineering Contradiction:

Improveswitch timing controlVSAvoidelectromechanical control reliability

Core Design Contradiction:

Extent of automationVSReliability

Solution Approach 1:

The patent replaces the mechanical Hall element sensing system with an electromagnetic field-based control system. Instead of using mechanical Hall elements to sense locations and determine switch timing, the system uses auxiliary excitation windings connected in series with magnetic field windings to achieve variable excitation control, eliminating the need for separate mechanical sensing components.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 need for multiple control units, enhancing operational flexibility and efficiency by allowing for variable excitation and shared power management between the machines.

Implementation Method 1

having the rotary part of magnetic force actuated electric machine being installed with an auxiliary excitation winding set, for being connected in series with a magnetic field winding set

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

switched DC electric machine having conduction ring and brush

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS9543797B2Cross-interlocked switch type DC electric machine having auxiliary excitation winding and conduction ring and brush

Publication Date: 2017.01.10 YANG TAI HER

AI summary

The present invention relates to a multi-set switched DC electric machine having conduction ring and brush and having its rotary part of electric machine being installed with an auxiliary excitation winding set, which is served to be driven by the DC power source or by the DC power source rectified from the AC power source, for being connected in series with a magnetic field winding set of electric machine of another electric machine through the auxiliary excitation winding set installed on the rotary part of electric machine, such that the excitation can be variable through altering the current of the magnetic field winding set of electric machine of the another electric machine thereby changing the operational characteristic of the electric machine.