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Voltage abnormality detection device

A technology for detecting device and abnormal voltage, which is applied in measuring devices, measuring current/voltage, measuring electricity, etc., can solve the problem that the power supply voltage abnormal detection circuit cannot accurately grasp the voltage value, and achieve the effect of good precision

Active Publication Date: 2017-08-29
BROTHER KOGYO KK
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the power supply voltage abnormality detection circuit cannot accurately grasp the current voltage value

Method used

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Embodiment Construction

[0025] Embodiments of the present invention will be described below. figure 1 The numerical control device 1 is an example of the abnormal voltage detection device of the present invention. The numerical control device 1 controls the machine tool 2 to cut a workpiece held on the upper surface of a table (not shown).

[0026] refer to figure 1 , the machine tool 2 will be described. The left-right direction, front-back direction, and up-down direction of the machine tool 2 are the X-axis direction, the Y-axis direction, and the Z-axis direction, respectively. The machine tool 2 includes a spindle mechanism, a spindle moving mechanism, a tool changer, and the like, which are not shown. The spindle mechanism includes a spindle motor 32 that rotates the spindle on which the tool is mounted. The spindle moving mechanism includes a Z-axis motor 31 , an X-axis motor 33 , and a Y-axis motor 34 to move the spindle in the X-axis direction, the Y-axis direction, and the Z-axis direct...

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Abstract

The invention discloses a voltage anomaly detection device which can precisely detect the voltage anomaly of a power supply well. A numerical control apparauts comprises a voltage anomaly detection circuit which comprises a reference circuit and an PFGA. An R-phase reference circuit divides a three-phase alternating-current voltage, and the R phase serves as the reference. When the potential difference between the R phase and the lower one of S and T phases is higher than a specified voltage, a pulse is outputted. An S-phase reference circuit divides the three-phase alternating-current voltage, and the S phase serves as the reference. When the potential difference between the S phase and the lower one of R and T phases is higher than the specified voltage, a pulse is outputted. A T-phase reference circuit divides the three-phase alternating-current voltage, and the T phase serves as the reference. When the potential difference between the T phase and the lower one of R and T phases is higher than the specified voltage, a pulse is outputted. The FPGA is used for analyzing the pulses outputted by the reference circuit, detecting whether there is a voltage anomaly or not, and detecting a voltage value. Accordingly, the numerical control apparauts can precisely detect whether there is an anomaly in the three-phase alternating-current voltage well.

Description

technical field [0001] The invention relates to a voltage anomaly detection device. Background technique [0002] The power conversion device controls an AC motor by directly monitoring an AC output of an arbitrary frequency from an AC power supply of a fixed frequency without direct current. Since an abnormality occurs in an output voltage waveform when an abnormality occurs in an input power supply voltage, it is difficult for an AC motor to operate satisfactorily. The power supply voltage abnormality of the three-phase AC power supply has various states such as a phase loss state and a state in which the phase sequence of the power supply is reversed. The open-phase state is a state in which only one of the three phases is disconnected. Therefore, the power conversion device needs to provide a power supply voltage abnormality detection circuit that detects the power supply voltage abnormality by some means and stops the operation. [0003] The power supply voltage abno...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00G01R29/18G01R31/02
Inventor 鹈饲敏明横田伸治
Owner BROTHER KOGYO KK
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