Motor Voltage Vector Distribution Control for Dual Inverter Systems
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Solution Overview
Problem
Existing motor systems with two power supplies and two inverters lack effective control methods to distribute motor voltage vectors efficiently, limiting flexibility in meeting power requests and increasing noise and losses.
Innovation Solution
A motor system with a control unit that calculates and adjusts the voltage vectors of two inverters to distribute motor voltage vectors at any ratio, allowing for flexible power distribution and noise reduction by changing the magnitude, phase, and direction of the inverter voltage vectors based on the state of charge and temperature of the power supplies and inverters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If two power supplies and two inverters are used to drive a motor, then power output capability is improved, but control complexity increases
Solution Approach 1:
The patent combines the control of two independent inverters into a unified control framework. The control unit integrates the voltage vector control of both inverters, treating them as a coordinated system rather than separate entities. This merging approach maintains the power output benefits of dual inverters while reducing control complexity through unified management.
Solution Approach 2:
The control unit implements a universal control strategy that can distribute power requests to either inverter or both inverters based on system conditions. The same control algorithm handles various operating modes (single inverter operation, dual inverter operation, power distribution ratios), providing multi-functional capability that simplifies the overall control architecture.
2Adaptability or versatility
If voltage vectors of two inverters are independently controlled, then flexibility in power distribution is improved, but noise and losses increase
Solution Approach 1:
The patent applies local quality by distributing different components of the voltage vector to different inverters based on their individual characteristics and operating conditions. Instead of uniform control, each inverter's voltage vector is optimized locally to minimize losses and noise while contributing to the overall motor drive requirement.
Solution Approach 2:
The control unit dynamically changes the parameters of the inverter voltage vectors (magnitude, phase, frequency) based on real-time system conditions. By adjusting these parameters optimally, the system achieves flexible power distribution while minimizing energy losses and noise generation through coordinated parameter optimization.
3Device complexity
If motor voltage vector is distributed to two inverters at fixed ratio, then system simplicity is improved, but adaptability to different power requests deteriorates
Solution Approach 1:
The patent implements dynamic voltage vector distribution where the allocation ratio between the two inverters is not fixed but continuously adjusted based on power requests and system conditions. This dynamic approach maintains relative system simplicity while achieving high adaptability through real-time optimization of the distribution ratio.
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 solution provides greater freedom in driving motors, meets various power requests, and reduces noise and losses by optimizing the operation of two inverters while maintaining motor output.
Implementation Method 1
a first inverter which converts direct current power from a first power supply into alternating current power
Implementation Method 2
a second inverter which converts direct current power from a second power supply into alternating current power
Implementation Method 3
A motor system with a control unit that calculates and adjusts the voltage vectors of two inverters to distribute motor voltage vectors at any ratio
Data Source
AI summary
A control unit calculates a motor voltage vector including a corresponding excitation voltage command and a torque voltage command in response to an output request for the motor and changes a first inverter voltage vector and a second inverter voltage vector while maintaining the motor voltage vector obtained to allow distribution of the motor voltage vector at any ratio. The first inverter voltage vector includes a first excitation voltage command and a first torque voltage command associated with an output from the first inverter, and the second inverter voltage vector includes a second excitation voltage command and a second torque voltage command associated with an output from the second inverter.