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Electric motor control device

A technology for control devices and motors, applied in motor control, AC motor control, control systems, etc., can solve problems such as the reduction of output power of motor control devices, and achieve the effect of high-precision life estimation calculations

Active Publication Date: 2015-02-04
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] A third conventional example: For example, Patent Document 2 proposes a technique of reducing or stopping the output power of the motor control device at the time when it is predicted that the life of the smoothing capacitor has reached the end of life based on the prediction result of life deterioration.

Method used

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Examples

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Embodiment approach 1

[0023] figure 1 It is a block diagram showing the configuration of the motor control device according to Embodiment 1 of the present invention. exist figure 1 In the diagram, the structure for estimating the life of the main circuit capacitor is shown using a part of the general structure of the motor control device.

[0024] First, a general configuration of a motor control device will be briefly described.

[0025] exist figure 1 Among them, the converter circuit 1 is a three-phase full-wave rectification circuit composed of a diode bridge, the AC input terminal is connected to the system power supply 3 through the inserted system impedance (reactor) 2, and the DC output terminal is connected to the positive busbar P and the negative busbar N connection. That is, the converter circuit 1 performs three-phase full-wave rectification on the three-phase AC voltage of the system power supply 3 input through the inserted system impedance 2, converts it into a DC voltage includ...

Embodiment approach 2

[0058] image 3 It is a block diagram showing the configuration of a motor control device according to Embodiment 2 of the present invention. In addition, in image 3 in, right with figure 1 The structural elements shown in (Embodiment 1) are identical or equivalent to the same reference numerals. Here, the description will focus on the part related to the second embodiment.

[0059] As shown in the figure, the motor control device according to the second embodiment is figure 1(Embodiment 1) On the basis of the structure shown, an expected life setting unit 26 and an operation time accumulation unit 27 are added, and an inverter control unit 7b, a capacitor life estimation unit 19b, and a capacitor life estimating unit 19b whose symbols are changed are provided. Judgment section 21b.

[0060] The capacitor life estimating circuit 19b calculates the remaining life time L of the main circuit capacitor 4 using formula (6). R , and output to the capacitor life determination ...

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Abstract

Ripple current flowing into a main circuit capacitor (4) is estimated based on power output to an electric motor (9) and a system impedance (2), thereby making it possible to always perform the ripple current estimation and life estimation calculation of the main circuit capacitor (4) in an online manner. Since the data (Zs) of the system impedance (2) significantly affecting the ripple current estimation of the main circuit capacitor (4) is used, it is possible to estimate capacitor ripple current in accordance with the magnitude of the system impedance (2), enabling main circuit capacitor life estimation calculation with high accuracy.

Description

technical field [0001] The present invention relates to a motor control device, and more particularly to a motor control device provided with a life estimation function of a main circuit capacitor for stably forming a bus voltage of a switching circuit. Background technique [0002] The switching circuit, which is the main element of the inverter unit in the motor control device, switches the bus voltage on and off through switching elements arranged between DC buses of different poles to generate drive power for the motor. The bus voltage in this switching circuit is a DC voltage stabilized by removing ripple components of a DC voltage obtained by rectifying an input AC voltage by the converter circuit with a smoothing capacitor. In this way, the smoothing capacitor used to stably form the bus voltage in the switching circuit is called a main circuit capacitor. [0003] However, in the motor control device, a pulsating current caused by a pulsating component included in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/12H02M7/48
CPCH02P29/0033H02P29/026H02P27/085H02P6/12G01R31/42H02P29/40G01R31/64
Inventor 加藤昌则
Owner MITSUBISHI ELECTRIC CORP