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motor control equipment

A technology of motor control and equipment, applied in motor control, AC motor control, control system, etc., can solve problems such as deceleration torque can not be output, machine collision, error, etc.

Active Publication Date: 2020-12-01
OKUMA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Here, there is a possibility that in the demagnetized state, the ideal deceleration torque cannot be output at the time of deceleration, the table 141 exceeds the target position and causes a machine collision, etc.
That is, if the values ​​of the thresholds Ref1, Ref2, Ref3, and Ref4 are increased to prevent over-detection, an abnormality causing demagnetization that cannot be detected at the necessary time is ignored
Furthermore, conversely, if the values ​​of the thresholds Ref1, Ref2, Ref3, and Ref4 decrease, there is another problem of frequently causing excessive detection that demagnetization is erroneously detected as occurring despite the absence of demagnetization.

Method used

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Embodiment Construction

[0021] Examples are described. The same components as in the example of the related art are assigned the same reference numerals, and their detailed descriptions are omitted. figure 1 and figure 2 A block diagram of a motor control device of the present invention is shown. similar to Figure 4As an example of the motor control device, the motor control device of the present invention also outputs two-phase current command values ​​Idc and Iqc based on the speed difference Vdif, and calculates the difference between the current command values ​​Idc and Iqc (current difference) and the difference between the current feedback values ​​Idd and Iqd (current difference) is proportionally integrated, and two-phase voltage differences ΔVdc and ΔVqc are output. Furthermore, the motor control apparatus calculates two-phase voltage feed-forward values ​​Vdff and Vqff based on the two-phase current command values ​​Idc and Iqc and the speed detection value Vdet of the motor 14 . Then...

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Abstract

A motor control device that calculates a speed difference based on a speed command and a speed detection value of a motor, calculates a field current common phase voltage difference based on a field current command value and a field current detection value, and judges occurrence when all of the following conditions are satisfied Demagnetization: The field current common phase voltage difference exceeds the voltage threshold; the speed difference exceeds the speed threshold; and acceleration is in progress.

Description

[0001] Cross References to Related Applications [0002] The entire disclosure of Japanese Patent Application No. 2015-250333 filed on December 22, 2015, including specification, claims, drawings, and abstract, is incorporated herein by reference in its entirety. technical field [0003] The present application relates to a motor control device used for a feed axis including a linear axis and a rotary axis in a machine tool or the like. Background technique [0004] Motors using permanent magnets, such as brushless DC motors used for the feed axes of mobile machine tools, etc., require high output and high-speed response, and also need to maintain quality. In particular, machine tools and the like are often used in harsh environments. Therefore, conventionally, in order to deal with insulation degradation due to aging and the like, various attempts are made in the motor to detect abnormalities before the motor completely fails, that is, in the initial stage of failure. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/06
CPCH02P27/06H02P29/0241H02P21/22H02P29/032H02P29/024
Inventor 柴田知宏花木义麿
Owner OKUMA CORP