Shared Inverter Control for Three-Phase and Multiple DC Motors
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Solution Overview
Problem
Conventional rotating machine control devices are unable to simultaneously drive one DC motor and one three-phase motor, nor can they drive multiple DC motors simultaneously with a three-phase motor, requiring excessive switches and complicating the circuit configuration.
Innovation Solution
A rotating machine control device is designed to drive multiphase rotating machines and DC rotating machines using a single drive circuit, where the first terminal of each DC rotating machine is connected to a phase current path of a multiphase winding set, allowing simultaneous control of multiple DC rotating machines connected to the same phase, reducing the number of switches required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional rotating machine control devices are used to drive multiple DC motors simultaneously with a three-phase motor, then the control capability is improved, but the number of switches increases and the circuit configuration becomes complicated
Solution Approach 1:
The patent merges the control of multiple DC motors and a three-phase motor into a single unified control device. The control unit integrates multiple control circuits that can simultaneously control DC motors connected to different phases (U-phase, V-phase, W-phase) and the three-phase motor through a common switching unit, eliminating the need for separate control devices and reducing overall circuit complexity.
Solution Approach 2:
The switching unit is designed with universal functionality to handle both DC motor control and three-phase motor control. The same switching elements and control unit can switch between different operating modes (DC motor mode and three-phase motor mode) and simultaneously control multiple DC motors connected to different phases, providing multi-functional capability without requiring dedicated circuits for each motor type.
2Adaptability or versatility
If conventional rotating machine control devices are used to drive one DC motor and one three-phase motor, then the control capability is improved, but the number of switches increases
Solution Approach 1:
The patent combines the switching elements for DC motor control and three-phase motor control into a single shared switching unit. The same switches are used for both DC motor operation and three-phase motor operation by appropriately controlling the switching timing and configuration, thereby reducing the total number of switches required compared to using separate control circuits.
Solution Approach 2:
The control unit dynamically reconfigures the switching elements based on the operating mode. When controlling DC motors, the switching unit operates in DC motor control configuration; when controlling the three-phase motor, it reconfigures to three-phase motor control mode. This dynamic reconfiguration allows the same physical switches to serve multiple purposes, reducing the quantity of switches needed.
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 efficient and simplified control of multiphase and DC rotating machines, reducing the number of switches needed and allowing for simultaneous operation of multiple DC motors with a three-phase motor, enhancing the operational flexibility and efficiency of the control device.
Implementation Method 1
a multiphase power converter that converts DC power of a power supply into multiphase AC power by operations of a plurality of inverter switching elements connected in a bridge configuration and applies a voltage to each phase winding of the multiphase winding set
Implementation Method 2
a DC rotating machine switch that converts DC power into variable voltage by switching operations and applies the variable voltage to the DC rotating machine
Data Source
AI summary
One or more multiphase power converters are connected to a power supply via a high potential line and a low potential line, convert DC power of the power supply into multiphase alternate current power by operations of inverter switching elements, and apply a voltage to each of phase windings of the multiphase winding set. A DC rotating machine switch are made up of two or more legs, each of which is made up of 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. The DC rotating machine switch makes 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.