Motor Controller Dual Circuits Torque Fluctuation
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Solution Overview
Problem
The controllability of steered angles in motors with independent stator coils can be compromised due to differences in detection values from rotation angle sensors, leading to decreased precision and potential torque fluctuations.
Innovation Solution
A controller with two processing circuits that communicate and operate drive circuits based on calculated operation amounts, using integral elements to adjust for differences in detection values and switch between operation processes to maintain target angles, thereby reducing steady-state deviations and torque abruptness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If independent stator coils with separate drive circuits are used to improve reliability, then system redundancy is improved, but detection value differences from rotation angle sensors cause decreased controllability of steered angles
Solution Approach 1:
The system is divided into two independent processing circuits, each with its own operation amount calculation process. The first processing circuit calculates a first operation amount based on detection values from the first rotation angle sensor, while the second processing circuit calculates a second operation amount based on detection values from the second rotation angle sensor. This segmentation allows independent calculation while maintaining overall system redundancy and controllability.
Solution Approach 2:
The patent changes the operational parameters by introducing two distinct operation amount calculation processes with different integral elements. The first operation amount uses a first integral element, while the second operation amount uses a second integral element. This parameter differentiation allows each processing circuit to independently adjust for detection value differences, thereby maintaining controllability despite using independent sensors.
2Measurement precision
If operation amount calculation based on integral elements is used to reduce steady-state deviation, then control precision is improved, but switching between operation processes causes abrupt torque changes
Solution Approach 1:
The patent applies preliminary action by setting an initial value for the second integral element based on the output value of the first integral element before switching from the first operation process to the second operation process. This preliminary setting prevents abrupt torque changes that would otherwise occur during the transition, as the second integral element starts from a pre-calculated value that accounts for the current system state.
Solution Approach 2:
The initial value setting process acts as an intermediary between the first and second operation processes. By calculating the initial value of the second integral element from the first integral element's output, the system creates a smooth transition mechanism that mediates between two different control processes, preventing abrupt torque changes while maintaining the benefits of both operation modes.
3Device complexity
If a single processing circuit is used to simplify the controller structure, then device complexity is reduced, but the system lacks redundancy and cannot continue operation if the processing circuit fails
Solution Approach 1:
The controller is segmented into two independent processing circuits, each capable of independently calculating operation amounts and controlling the motor. This segmentation increases reliability through redundancy, as the system can continue operation using one processing circuit if the other fails, while maintaining a relatively simple overall structure through modular design.
Solution Approach 2:
The patent uses parameter changes by introducing two distinct operation amount calculation processes with different integral elements. The first operation amount uses a first integral element, while the second operation amount uses a second integral element. This parameter differentiation allows each processing circuit to independently adjust for detection value differences, thereby maintaining controllability despite using independent sensors.
Data Source
AI summary
A controller for a motor includes a first processing circuit and a second processing circuit. The first processing circuit is configured to execute a first operation amount calculation process, an operation process, and an output process. The first operation amount calculation process is a process of calculating a first operation amount. The operation process is a process of operating a first drive circuit. The second processing circuit is configured to execute a second operation amount calculation process, a first use operation process, a second use operation process, and an initial value setting process. The second operation amount calculation process is a process of calculating a second operation amount. The initial value setting process is a process of setting an initial value of an integral element depending on a value of an integral element of the first operation amount calculation process.