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motor control unit

A control device and motor technology, applied in the direction of AC motor control, control system, electrical components, etc., can solve problems such as junction temperature exceeding, production line loss, rectifier diode damage, etc.

Active Publication Date: 2019-05-03
SANYO DENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the equipment is operated by driving the motor with the inverter, the equipment stops, so losses occur in the production line, etc.
That is, in the Japanese Patent Laid-Open Publication No. Hei 5-30644 method, it is difficult to protect the rectifier diode without stopping the equipment when the power supply is unbalanced.
In addition, in the method of Japanese Patent Laid-Open Publication No. Hei 5-30644, if the current of a certain phase continues to be above the rated current for a certain period of time, the temperature of the rectifier diode rises, and the junction temperature exceeds a specified value, and the rectifier diode The diode may be damaged

Method used

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Experimental program
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no. 1 approach ＞

[0063] Next, the first embodiment will be described. figure 1 It is an explanatory diagram of the motor control device 1 of the first embodiment. figure 2 It is an explanatory drawing of the effect of 1st Embodiment.

[0064] Such as figure 1 As shown, the motor control device 1 is supplied with AC power from an external three-phase AC power supply 9 . The three-phase AC power supply 9 supplies three-phase AC power of R-phase, S-phase, and T-phase to the motor control device 1 . Furthermore, the motor control device 1 drives the motor 3 . More specifically, the motor 3 is a three-phase AC motor driven by three-phase AC power input from the motor control device 1 . The motor 3 is used, for example, in various devices (not shown). The rotation of the motor 3 is detected by the encoder 5 . The detected rotation (speed) of the motor 3 is input to the motor control device 1 . The motor control device 1 implements feedback by, for example, a method described later. In addit...

no. 2 approach ＞

[0092] image 3 It is an explanatory diagram of the motor control device 1 of the second embodiment. Figure 4 It is explanatory drawing of the effect of 2nd Embodiment. In addition, descriptions of the same points as those of the first embodiment are omitted.

[0093] The points of difference between the second embodiment and the first embodiment are as follows. In the second embodiment, as in the first embodiment, the electric motor 3 is supplied with electric current from the three-phase AC power supply 9 . In addition, in the second embodiment, the electric current from the motor 3 is regenerated to the three-phase AC power supply 9 . Therefore, converter 13 of the second embodiment includes not only diodes but also semiconductors (power transistors) controlled by voltage input to the gate. As semiconductors (power transistors) for example power MOSFETs (Metal Oxide Semiconductor Field Effect Transistors) or insulated gate bipolar transistors (IGBTs) are used. Accordi...

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Abstract

The invention provides a motor control device comprising the following structures: a converter electrically connected with a three-phase AC power source; an inverter electrically connected with the converter and the motor; a control portion used for detecting the current flowing between the three-phase AC power source and the converter, and controlling the inverter. The control portion can control according to the current value flowing the three-phase, so the maximum current flowing the three-phase has the absolute value bigger than 0 and smaller than a preset value.

Description

[0001] Cross References to Related Applications [0002] This application is based on Japanese Patent Application No. 2014-199020 submitted to the Japan Patent Office on September 29, 2014, and therefore the entire content of the Japanese Patent Application is incorporated herein by reference. technical field [0003] The invention relates to a motor control device. Background technique [0004] In a motor control unit, a converter rectifies and converts three-phase AC current from a three-phase AC power supply to DC current. The inverter again converts the above DC current into AC current. The motor is driven by the aforementioned alternating current. [0005] In such a motor control device, for example, load imbalance may occur due to impedance imbalance of high-voltage power receiving and distribution equipment or the connection of the same three-phase power supply line to a single-phase power supply device. As a result, an imbalance may occur in the AC voltage input t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/08
Inventor 井出勇治山﨑悟史小山雅久
Owner SANYO DENKI CO LTD