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Alternating current motor driving device with charging function and charging method thereof

A technology of AC motors and driving devices, applied in the direction of AC motor control, output power conversion devices, electrical components, etc., to achieve the effects of shortening charging time, eliminating large current spikes, and reducing stress

Active Publication Date: 2012-11-28
VACON CHINA DRIVERS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is still required to keep low standby power consumption, then unnecessary loops can be closed by relays etc. This solution increases parts count and is therefore expensive

Method used

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  • Alternating current motor driving device with charging function and charging method thereof
  • Alternating current motor driving device with charging function and charging method thereof
  • Alternating current motor driving device with charging function and charging method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] figure 1 The main circuit diagram of the AC motor drive device controlled by the frequency converter is given. The AC motor driving device includes a three-phase AC wire connection terminal L 1 , L 2 , L 3 ;A master switch K 1 , charging resistor R C1 , R C2 Parallel connection between the two-phase contacts of the power supply; a rectifier REC composed of 6 diodes; an intermediate DC circuit, the voltage between the DC+ and DC- poles of the intermediate DC circuit is u DC , the intermediate DC link consists of two balancing resistors R 1 , R 2 The capacitor unit C 1 , C 2 Composition; Inverter INU consisting of 6 controllable switches, for example, IGBTs with anti-parallel freewheeling diodes V 1 …V 6 , The IGBT is connected to U, V, W at the output to generate a three-phase AC output voltage with adjustable frequency and amplitude; an AC motor M.

[0026] The inverter also includes an auxiliary power supply PS. As shown in this example, the input power of...

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PUM

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Abstract

The invention discloses an alternating current motor driving device and a method for charging a capacitor unit. The alternating current motor driving device consists of an alternating current motor, a frequency converter and a master switch, wherein the frequency converter comprises a rectifier, an inverter, an intermediate direct current circuit with a capacitor unit, a control unit for controlling the frequency converter to operate, and a charging device for charging the capacitor unit; the charging device comprises a regulated power supply which is electrically connected with the intermediate direct current circuit and provides constant charging current for the capacitor unit; and the master switch controls the operation of the regulated power supply. The alternating current motor driving device has the beneficial effects that a power supply with adjustable or program control constant current is provided for charging the capacitor unit, the energy consumption is reduced, the high-current sharp pulse in the prior art is eliminated, and the stress of the master switch is reduced, so that the service life of the master switch is prolonged.

Description

technical field [0001] The invention relates to an AC motor driving device with charging function and a method for charging a capacitor unit in a frequency converter of the AC motor driving device. Background technique [0002] For the adjustment of the speed or torque of the AC motor, the squirrel-cage AC motor controlled by the frequency converter is the most commonly used nowadays, which is hereinafter referred to as the AC motor drive device. [0003] The most common type of frequency converter today is the voltage-controlled PWM (Pulse Width Modulation), where the AC mains voltage is first regulated and then filtered in the intermediate circuit by capacitors with high capacitance to produce a constant DC voltage, Finally, it is converted into an adjustable AC output voltage through the inverter bridge, and the amplitude of the pulse contained in the voltage reaches a constant DC voltage of the intermediate circuit. [0004] In some applications, such as elevators, AC m...

Claims

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Application Information

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IPC IPC(8): H02P27/06H02M1/32H02M1/36
Inventor 帕沃梅瑞琳娜尤哈维泰宁
Owner VACON CHINA DRIVERS CO LTD