Motor information acquisition system

Patent metadata

Field	Value
Publication number	US-11237213-B2
Application number	US-202016909021-A
Country	US
Kind code	B2
Filing date	Jun 23, 2020
Priority date	Jul 5, 2019
Publication date	Feb 1, 2022
Grant date	Feb 1, 2022

Abstract

A motor information acquisition system is provided that acquires information representing an operation state of a motor included in a machine tool in order to monitor a state of the machine tool and that includes a motor control device configured to control the motor based on control data, a timing generation section configured to generate acquisition timing of the information representing the operation state of the motor based on the control data, a rotor magnetic flux reduction command output section configured to output a command for reducing a magnetic flux density of a rotor of the motor to the motor control device when the acquisition timing is reached, and a motor information acquisition section configured to acquire information representing the operation state of the motor when the magnetic flux density of the rotor is reduced by the command.

First claim

The invention claimed is:

1. A motor information acquisition system that acquires information representing an operation state of a motor included in a machine tool in order to monitor a state of the machine tool, the motor information acquisition system comprising:
a controller configured to control the motor based on control data, wherein the control data includes an operation command generated from a machining program; and
a processor configured to:
generate acquisition timing to acquire the information representing the operation state of the motor based on the control data, wherein, in the acquisition timing, the motor reaches a constant speed and a current flowing through the motor is a level lower than a preset threshold;
output, when the acquisition timing is generated, a command to reduce a magnetic flux density of a rotor of the motor to the controller; and
acquire the information representing the operation state of the motor for the acquisition timing after reducing the magnetic flux of the rotor of the motor based upon the command.

2. The motor information acquisition system according to claim 1 , wherein
the motor is an induction motor, and
the controller reduces an exciting current of the induction motor in response to the command.

3. The motor information acquisition system according to claim 1 , wherein
the motor is a synchronous motor, and
the controller increases a D-phase current of the synchronous motor in response to the command.

4. The motor information acquisition system according to claim 1 , wherein the information representing the operation state of the motor includes waveform data of at least one of a current signal representing a current flowing through the motor and a speed signal representing a speed of the motor.

Assignees

• Fanuc Corp

Inventors

• Kamiya Yohei

Classifications

• G01R31/343 Primary

  in operation · CPC title

• G05B2219/37616

  Use same monitoring tools to monitor tool and workpiece · CPC title

• G05B19/4065 Primary

  Monitoring tool breakage, life or condition · CPC title

• Y02P70/10

  Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working · CPC title