Rotary Machine Control Apparatus Torque Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional rotary machine control apparatuses face challenges in maintaining torque output when a short circuit failure occurs in one of the systems, leading to braking torque generation due to counter electromotive voltage, which requires increased current supply to the normal system to compensate, while also managing heat generation.
Innovation Solution
A control apparatus with electric power converters, failure detection, and a control portion that calculates current command values and maximum current limit values, stopping output to the failed system and increasing the maximum current limit value in the normal system as the rotation angular velocity increases to compensate for braking torque without excessive heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the maximum current limit value is increased to compensate for braking torque, then the torque output is improved, but the heat generation in the normal system increases
Solution Approach 1:
The maximum current limit value is made dynamic by adjusting it according to the rotation angular velocity. As the rotation speed increases, the current limit is increased to compensate for the braking torque effect. This dynamic adjustment ensures that the torque output remains sufficient across different operating conditions while preventing excessive heat generation at lower speeds where the braking torque effect is minimal.
Solution Approach 2:
The control apparatus changes the parameter of maximum current limit value based on the rotation angular velocity. By varying this parameter dynamically, the system optimizes the balance between torque compensation and heat management, allowing higher current at higher speeds where braking torque is more significant, and limiting current at lower speeds to prevent overheating.
2Force
If the current supply to the normal system is increased to compensate for braking torque, then the torque output is improved, but the risk of element damage from excessive heat increases
Solution Approach 1:
The system dynamically adjusts the current supply based on rotation angular velocity, creating a speed-dependent current limit. This ensures that compensatory current is only increased when the rotation speed is high enough that the braking torque effect is significant, while preventing excessive current at low speeds that would cause overheating and element damage.
Solution Approach 2:
The control apparatus changes the maximum current limit parameter according to rotation angular velocity, optimizing the balance between torque compensation and thermal management. This parameter adjustment strategy maintains reliability by preventing excessive heat generation while ensuring sufficient torque output when needed.
3Temperature
If the maximum current limit value is kept low to prevent heat generation, then the heat management is improved, but the torque output is insufficient to compensate for braking torque
Solution Approach 1:
The maximum current limit is dynamically adjusted based on rotation angular velocity, allowing the system to optimize torque output at each operating speed. At high rotation speeds where braking torque is significant, the current limit is increased to provide sufficient compensation. At low speeds where heat management is critical, the current limit is kept lower to prevent overheating.
Solution Approach 2:
The control apparatus varies the maximum current limit parameter according to rotation angular velocity, creating an optimal balance between torque compensation and heat management across the entire operating range. This parameter change strategy ensures that the system can deliver sufficient torque when needed while maintaining thermal safety.
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
Effectively compensates for braking torque and prevents heat generation in the normal system by increasing the maximum current limit value with rotation angular velocity, ensuring torque output and preventing element damage from excessive heat.
Implementation Method 1
electric power converters in a plurality of systems... convert DC power to supply to a corresponding winding group
Implementation Method 2
a braking torque against a driving may generate in the rotary machine due to the counter electromotive voltage, which is generated in the failure system accompanied with the rotation of the rotary machine
Data Source
AI summary
A rotary machine control apparatus controlling a drive of a rotary machine that has multiple winding groups is provided. The rotary machine control apparatus includes electric power converters in multiple systems, a failure detection portion, and a control portion. An electric power converter has switching elements in an upper arm and a lower arm and converts DC power. The failure detection portion detects a failure of an electric power converter or a winding group. The control portion calculates a current command value and a maximum current limit value, and controls an output to the electric power converter. The control portion stops the output to the electric power converter in a failure system, and the control portion increases the maximum current limit value with respect to the output to an electric power converter in a normal system.