Shared Drive Circuit Control for DC and Multiphase Motors
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Solution Overview
Problem
Existing rotating machine control devices face challenges in efficiently driving both multiphase rotating machines and direct current (DC) rotating machines using a single drive circuit, requiring complex switch configurations and additional switches to manage phase energization and de-energization.
Innovation Solution
A rotating machine control device is configured with multiphase power converters, a DC rotating machine switch, and a control unit, where the DC rotating machine switch is independently managed to allow simultaneous control of DC and multiphase machines, reducing the number of switches needed and enabling efficient energization and de-energization of DC motors without affecting the multiphase machines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single drive circuit is used to drive both multiphase rotating machines and DC rotating machines, then device complexity is reduced, but switch management becomes more complex and additional switches are required
Solution Approach 1:
The drive circuit is segmented into distinct control paths: a multiphase power converter for multiphase rotating machines and a separate DC rotating machine switch for DC rotating machines. This segmentation allows each component to be optimized independently while sharing common elements like the power supply connection, reducing overall complexity while maintaining ease of control.
Solution Approach 2:
The drive circuit is designed with universal components that serve multiple functions. The power supply connection point is shared between multiphase and DC rotating machines, and the control unit can independently manage both machine types through a unified control architecture, eliminating the need for separate complete drive circuits.
2Adaptability or versatility
If additional switches are added to manage phase energization and de-energization, then control flexibility is improved, but device complexity increases
Solution Approach 1:
The DC rotating machine switch is extracted as a separate, independently managed component from the multiphase power converter. This extraction simplifies the switch configuration by dedicating specific switches to DC machine control, reducing the complexity of managing switches across the entire system while maintaining the flexibility needed for independent control of each machine type.
Solution Approach 2:
The control system employs dynamic switching strategies where the DC rotating machine switch can be independently controlled based on real-time operational requirements. This dynamic control allows the system to adapt to different operating conditions (such as regenerative braking or motor mode) without requiring a fixed, overly complex switch configuration.
3Productivity
If DC rotating machine switch is independently managed, then operational efficiency is enhanced, but control system complexity increases
Solution Approach 1:
The control unit acts as an intermediary that manages both the multiphase power converter and the DC rotating machine switch through a unified control logic. This intermediary approach allows independent management of the DC rotating machine switch for optimized operational efficiency while presenting a simplified interface to the operator and reducing overall control system complexity through centralized intelligence.
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 allows for efficient and flexible control of both DC and multiphase rotating machines, reducing the complexity of switch management and enhancing operational efficiency in applications like electric power steering systems.
Implementation Method 1
one or more multiphase power converters connected to a positive electrode and a negative electrode of a power supply via a high potential line and a low potential line, respectively
Implementation Method 2
one or more direct current (DC) rotating machines in which a first terminal that is one end is connected to a phase current path of one or more phases of at least one of the multiphase winding sets
Data Source
AI summary
One or more multiphase power converters are connected to a positive electrode and a negative electrode of a power supply via a high potential line and a low potential line, respectively, convert DC power of the power supply into multiphase alternate current power by operations of a plurality of inverter switching elements, and apply a voltage to each of phase windings of a multiphase winding set. A DC rotating machine switch including switches on a high potential side and a low potential side connected in series via a DC motor terminal connected to a second terminal that is an end of the DC rotating machine on an opposite side to a first terminal. The DC rotating machine switch generates a voltage of the DC motor terminal variable by switching. A control unit controls operations of the inverter switching elements and the DC rotating machine switch.