Motor driving apparatus having power regeneration function

A driving device and power regeneration technology, which is applied in the direction of output power conversion device, motor control in four quadrants, electrical components, etc., can solve the problem that the regenerative action cannot be guaranteed to stop, and achieve the effect of reliable regenerative action

Inactive Publication Date: 2011-07-20
FANUC LTD
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  • Summary
  • Abstract
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  • Claims
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Problems solved by technology

However, in this proposal, it is judged that the current value in the corrected regenerative current sampling phase becomes less than a predetermined value, but the regenerative operation cannot be reliably stopped by this judgment.

Method used

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  • Motor driving apparatus having power regeneration function
  • Motor driving apparatus having power regeneration function
  • Motor driving apparatus having power regeneration function

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Embodiment Construction

[0022] In order to easily understand the present invention, first use Figure 1 to Figure 5 The regenerative operation of the rectifier in the motor drive unit and the problems of the prior art will be described. figure 1 It is a block diagram showing a configuration example of a motor drive device using a rectifier of a 120-degree energization method. exist figure 1 Among them, symbol 102 represents a motor, symbol 104 represents an industrial three-phase input power supply, symbol 106 represents an inverter (inverter), and symbol 108 represents a rectifier (only the main circuit part is shown). In addition, reference numeral 112 denotes a three-phase input voltage detection circuit, reference numeral 114 denotes a three-phase input current detection circuit, reference numeral 116 denotes a DC voltage detection circuit, and reference numeral 120 denotes a rectifier control unit.

[0023] The rectifier 108 includes a three-phase bridge rectification circuit and smoothing cap...

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Abstract

A motor driving apparatus has power regeneration function wherein provisions are made to ensure that the regenerative operation of a rectifier continues as long as the supply of power from an inverter continues, and that the regenerative operation of the rectifier stops when the supply of power from the inverter ends. The apparatus includes: a detection unit which detects an input voltage and current; an instantaneous effective power calculation unit which, based on the detected input voltage and current, calculates instantaneous effective power supplied from the rectifier to the inverter; a DC component calculation unit which, based on the value of the calculated power, calculates the DC component of the effective power; and a regenerative operation stopping decision unit which compares the value of the calculated DC component with a predetermined threshold value and decides that a power regeneration operation for feeding regenerative power from the inverter back into the power supply be stopped.

Description

technical field [0001] The present invention relates to a motor drive device having a power regeneration function for returning regenerative power generated when a motor is decelerated to a power source. Background technique [0002] Inverters that convert industrial power into DC power and supply the DC power as power converters for motor control are used in motor drives for machine tools, forging machines, injection molding machines, industrial robots, and industrial machinery (inverter) rectifier (forward converter or AC-DC converter). In today's energy saving trend, rectifiers with power regeneration devices that return the power generated when the motor decelerates to the power supply, and rectifiers with a 120-degree power supply method that can realize power regeneration at a low cost have also been widely used ( For example, refer to the following patent document 1). [0003] In the above-mentioned rectifier of the 120-degree energization method, there are two kind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/797
CPCH02P23/06
Inventor 岩下平辅置田肇丹羽正一
Owner FANUC LTD
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