Motor Phase Current Deadbeat Control With Model Mismatch Compensation
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Solution Overview
Problem
Conventional predictive deadbeat control units for motor drives are difficult to tune due to fixed preset time periods and are sensitive to model mismatches, leading to steady-state errors, making them less popular and user-unfriendly.
Innovation Solution
A motor control device with an adjustable preset time period and an integrator unit added in parallel to the predictive deadbeat control unit, allowing users to adjust the time period and tune the controller using standard control criteria like settling time and damping ratio, thereby compensating for model mismatches and improving usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If predictive deadbeat control is used to minimize motor phase current error within a preset time period, then the control speed and responsiveness are improved, but the controller becomes very sensitive to noise and model mismatches, leading to steady-state errors
Solution Approach 1:
The patent introduces an adjustable preset time period parameter that allows the controller to dynamically adapt its response characteristics. By making the time period adjustable rather than fixed, the controller can optimize between fast response and noise rejection based on operating conditions, resolving the contradiction between control speed and reliability.
Solution Approach 2:
The patent changes the parameter of the preset time period from a fixed value to an adjustable parameter. This allows users to tune the controller by modifying the time period parameter, enabling adaptation to different noise levels and model accuracy conditions while maintaining the fast response characteristics of deadbeat control.
2Productivity
If the preset time period is minimized to achieve fast error removal, then the control dynamics are improved, but the controller becomes difficult to tune and less user-friendly
Solution Approach 1:
By making the preset time period adjustable, the patent enables users to tune the controller according to their specific application requirements. This dynamic parameter adjustment transforms a difficult-to-tune fixed-parameter controller into an easily adaptable system that maintains high productivity while improving ease of operation.
3Device complexity
If predictive deadbeat control uses a fixed model for control calculations, then the control algorithm is simple and fast, but model mismatches lead to steady-state errors
Solution Approach 1:
The patent introduces adaptability to the control system by allowing the preset time period to be adjusted based on operating conditions. This dynamic adjustment enables the simple and fast control algorithm to adapt to model mismatches, maintaining both low complexity and high reliability across varying operating conditions.
Data Source
AI summary
The invention relates to a motor control device for controlling a motor current, with a predictive deadbeat control unit configured to, based on a motor current error input signal, use a model predictive control scheme for providing an output signal for controlling the motor current according to a deadbeat control scheme, where the deadbeat control scheme is characterized by minimizing the motor current error input signal within a preset time period; an interface unit configured to allow adjusting the preset time period by a user input; and an integrator unit configured to, based on the motor current error input signal, provide an integrator output that is added to the output signal for controlling the motor current with controlling a motor current, with the advantages of a predictive deadbeat control scheme while avoiding the problems present in the conventional predictive deadbeat approaches. The invention also relates to a corresponding method.