Motor Drive Load Characteristic Measurement via Adaptive Patterns

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Solution Overview

Problem

Conventional motor drive devices are not optimally suited for servo adjustments, particularly in measuring load characteristics, requiring specialized knowledge and experience, and are ineffective in applications with rapidly changing load characteristics or direct-drive configurations.

Innovation Solution

A motor drive device incorporating an operation pattern generator, position and speed controller, load characteristic compensator, and load characteristic measurement unit, which automatically generates and adjusts operation patterns to estimate load characteristics, including friction torque, using a combination of scaling processing and least square estimation, while preventing oscillations through adaptive filtering.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If conventional motor drive devices are used for servo adjustments, then basic position control and speed control functions are available, but load characteristic measurement requires specialized knowledge and experience, making the operation complex and time-consuming

Engineering Contradiction:

ImproveEase of load characteristic measurementVSAvoidComplexity of adjustment procedure

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The motor drive device automatically generates operation patterns and performs load characteristic measurements without requiring external intervention or specialized knowledge. The system self-configures by executing predetermined operation patterns and automatically calculating load characteristics from the results, enabling users without expertise to perform measurements easily

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system pre-generates operation patterns that are optimized for load characteristic measurement before actual use. These predetermined patterns include necessary test sequences and parameter settings, so that when measurement is needed, the system can immediately execute the pre-prepared patterns without requiring user setup or configuration

Inventive Principle:

Principle #10Preliminary action

2Productivity

If conventional operation patterns are used for load characteristic measurement, then basic measurement is possible, but measurement time is extended and responsiveness is reduced

Engineering Contradiction:

ImproveMeasurement speedVSAvoidMeasurement time

Core Design Contradiction:

ProductivityVSLoss of time

Solution Approach 1:

The system dynamically adjusts operation pattern parameters such as acceleration, deceleration, and positioning based on the specific measurement context. By optimizing these parameters, the system achieves faster measurement cycles while maintaining accuracy, reducing the time required compared to conventional fixed patterns

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The operation patterns are designed to be adaptive and dynamic rather than static. The system can modify measurement sequences and parameters in real-time based on system response, allowing for more efficient measurement that completes faster while capturing necessary load characteristic data

Inventive Principle:

Principle #15Dynamics

3Measurement precision

If high acceleration operation patterns are generated, then load characteristic measurement accuracy is improved, but torque requirements increase and may cause oscillations

Engineering Contradiction:

ImproveLoad characteristic measurement accuracyVSAvoidOscillations and torque limits

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The system incorporates feedback mechanisms that monitor system response during operation pattern execution. By observing actual torque requirements and system behavior, the system can adjust subsequent operation patterns to maintain high acceleration for accuracy while preventing excessive torque that would cause oscillations

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The system takes preliminary actions to prevent oscillations before they occur. By analyzing the relationship between acceleration patterns and torque requirements, the system pre-configures operation patterns that achieve necessary measurement accuracy while inherently avoiding torque levels that would trigger oscillatory behavior

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentEP2955842B1Motor drive device

Publication Date: 2017.10.18 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

AI summary

Motor drive device (30) according to the present invention includes operation pattern generator (1), position and speed controller (23), load characteristic compensator (24), and load characteristic measurement unit (7). Operation pattern generator (1) increases an absolute value of acceleration, at which a motor speed or a motor position is changed, in each operation pattern. Load characteristic measurement unit (7) measures the load characteristic to set load characteristic compensator (24) when torque command indicator is less than or equal to a torque limit value. Load characteristic measurement unit (7) ends the measurement of the load characteristic without setting load characteristic compensator (24) when the torque command indicator is greater than the torque limit value.