Motor Control Device Phase Rotation Interchange

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Conventional motor control devices for machine tools face complexity in management and maintenance due to non-standard connection phase rotations of motor power lines, leading to potential misinterpretation of incorrect connections.

Innovation Solution

A motor control device with a voltage command output unit, voltage command data interchanging unit, current detection unit, and current feedback data interchanging unit that can adjust voltage and current feedback data based on set phase rotation settings, allowing the motor to operate regardless of the connection phase rotation, while maintaining standard connections and preventing accidental operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the connection phase rotation of motor power lines is changed to switch motor rotation direction, then the motor rotation direction can be controlled, but the management and maintenance complexity increases due to non-standard connections

Engineering Contradiction:

Improvemotor rotation direction controlVSAvoidconnection phase rotation management

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The control device acts as an intermediary between the standard-connected motor and the control system. It detects the connection phase rotation and applies appropriate phase correction to the voltage commands, allowing the motor to be controlled as if it had standard connection without physically changing any connections.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The control device changes the parameter of voltage command phase rotation based on the detected connection phase rotation. By dynamically adjusting the phase rotation parameter of the voltage commands, the system compensates for non-standard connections and achieves proper motor control.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If non-standard connection phase rotation is used for motor drive, then specific mounting configurations are enabled, but errors may occur due to misinterpretation of connection correctness

Engineering Contradiction:

Improvemounting direction flexibilityVSAvoidconnection error prevention

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The control device detects the actual connection phase rotation of the motor power lines and uses this feedback information to automatically adjust the voltage command phase rotation. This closed-loop approach ensures that the motor operates correctly regardless of connection configuration, preventing errors due to misinterpretation of connection correctness.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The control device performs preliminary detection of the connection phase rotation before motor operation begins. By identifying the connection configuration in advance, the system can pre-calculate the appropriate phase correction needed, ensuring reliable operation from the start and preventing control errors.

Inventive Principle:

Principle #10Preliminary action

3Ease of manufacture

If the connection phase rotation differs from standard, then the motor can be mounted in convenient directions, but maintenance becomes complicated due to non-standard configurations

Engineering Contradiction:

Improvemounting convenienceVSAvoidmaintenance complexity

Core Design Contradiction:

Ease of manufactureVSEase of repair

Solution Approach 1:

The control device creates a virtual model of the connection phase rotation by detecting the actual wiring configuration. It then applies the corresponding phase correction to all control operations, allowing maintenance personnel to work with standard connection assumptions while the system handles the actual non-standard configuration transparently.

Inventive Principle:

Principle #26Copying

Data Source

PatentUS10090789B2Motor control device, motor control method, and non-transitory computer readable medium encoded with computer program

Publication Date: 2018.10.02 FANUC LTD

AI summary

To provide a motor control device capable of causing a motor to rotate in any rotation direction, even when leaving the connection state of the motor of a machine tool as standard. A motor control device (10) includes: a coordinate converter (36) as a voltage command output unit that outputs voltage command data instructing a voltage to be applied to a motor (14) based on an external instruction; a voltage command data interchanging unit (38) that outputs by interchanging or not interchanging the voltage command data, based on a setting for interchanging of a phase rotation of the voltage command data; a PWM output unit (40) as an amplifier that drives the motor (14) based on the voltage command data outputted by the voltage command data interchanging unit (38); a current detection unit (42) that detects the electric current flowing through the motor (14) and outputs current feedback data; and a current feedback data interchanging unit (44) that outputs by interchanging or not interchanging the current feedback data based on a setting for interchanging.