Motor Control Loop Frequency Testing via External Debug Injection
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Solution Overview
Problem
The integration of frequency characteristics measurement functions into motor control devices can lead to increased resource constraints, such as memory capacity, resulting in higher product costs due to the need for costly measurement equipment like frequency response analyzers.
Innovation Solution
A motor control system configuration that includes a semiconductor integrated circuit for motor control and an external debug device capable of accessing the memory, which generates and superimposes a disturbance signal on the control loop to derive frequency characteristics, allowing for external measurement without the need for costly equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If frequency characteristics measurement function is integrated into motor control device, then measurement capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the frequency characteristics measurement function from the motor control device and relocates it to an external debug device. The motor control device retains only its core motor control functions, while the external debug device performs frequency response analysis by injecting test signals and analyzing the control loop's response, thereby reducing device complexity while maintaining measurement capability
Solution Approach 2:
The patent introduces an external debug device as an intermediary between the user and the motor control device for frequency characteristics measurement. This intermediary handles the complex measurement tasks externally, allowing the motor control device to remain simple while still enabling detailed frequency response analysis through the external tool
2Measurement precision
If frequency characteristics measurement function is integrated into motor control device, then measurement capability is improved, but memory capacity and resource constraints worsen
Solution Approach 1:
The patent extracts the resource-intensive frequency characteristics measurement functionality from the motor control device's internal memory and resources. The external debug device performs all measurement computations and data storage independently, allowing the motor control device to maintain its original memory capacity without allocation for measurement functions
3Measurement precision
If costly measurement equipment like FRA is used, then measurement precision is improved, but product cost increases
Solution Approach 1:
The patent replaces expensive dedicated frequency response analyzer equipment with a more economical external debug device that can be integrated into the development workflow. This approach uses readily available debugging infrastructure to perform frequency characteristics measurement, significantly reducing product cost while maintaining adequate measurement precision for development and validation purposes
Data Source
AI summary
The present disclosure relates to a motor control system including: a motor control device, including a semiconductor integrated circuit having a memory and forming a control loop for a motor so as to control a drive of the motor; and an external debug device, externally connected to the motor control device and accessible to the memory in the motor control device. The external debug device includes a disturbance signal superimposer and a frequency characteristics deriver. The interference signal superimposer generates a disturbance signal for the control loop and superimposes the disturbance signal on a signal generated in the control loop. The frequency characteristics deriver derives frequency characteristics of the control loop based on the signal generated in the control loop by superimposition.