Dual Inverter Motor Control for Stable Torque During Mode Switching
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Solution Overview
Problem
The switching of motor driving modes in dual inverter systems leads to unstable torque output due to rapid reductions in available voltage, which existing methods to stabilize efficiency often compromise motor driving apparatus efficiency.
Innovation Solution
A motor driving apparatus with a dual inverter system that includes a controller to perform flux weakening control by linearly adjusting the output voltage level of the inverter for a preset time interval during mode switching, stabilizing torque output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If motor driving mode is switched when switching condition is satisfied, then motor can operate in optimal efficiency mode, but torque output becomes unstable due to rapid voltage reduction
Solution Approach 1:
The controller performs preliminary flux weakening control before the actual mode switching occurs. When the switching condition is satisfied, the controller starts adjusting the output voltage level linearly over a preset time interval, preparing the motor for the upcoming mode change and preventing torque instability during the transition.
Solution Approach 2:
The controller dynamically adjusts the output voltage level of the inverter during the mode switching process. By linearly changing the voltage level over a preset time interval rather than making an abrupt change, the system maintains torque stability while transitioning between driving modes.
2Stability of the object's composition
If switching reference line of maximum efficiency is adjusted to stabilize torque, then torque stability improves, but motor driving apparatus efficiency decreases
Solution Approach 1:
The controller changes the voltage level parameter dynamically during mode switching. By linearly adjusting the output voltage level over a preset time interval, the system maintains optimal efficiency operation while ensuring torque stability during the transition, avoiding the need to shift the switching reference line.
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
Stabilizes torque output during mode switching by reducing voltage fluctuations, maintaining efficiency, and preventing torque shocks.
Implementation Method 1
the controller may determine whether flux weakening control is performed according to an available voltage level of the dual inverter and to perform the flux weakening control by linearly adjusting an output voltage level of the dual inverter
Data Source
AI summary
A motor driving apparatus includes a motor having a plurality of windings, a dual inverter including a first inverter connected to first ends of the plurality of windings and a second inverter connected to second ends of the plurality of windings and configured to drive the motor through at least one of the first inverter or the second inverter according to a motor driving mode, and a controller configured to determine whether flux weakening control is performed according to an available voltage level of the dual inverter when a switching condition of the motor driving mode is satisfied and to perform the flux weakening control by linearly adjusting an output voltage level of the dual inverter for a preset time interval for which the flux weakening control is performed.