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Method for starting an electric motor in a hydraulically operated working machine

A technology for hydraulic excavators and hydraulic pumps, which is applied in the field of asynchronous motors and can solve problems such as voltage interruptions

Inactive Publication Date: 2013-06-12
卡特彼勒全球矿业HMS有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The disadvantage of this circuit is that when switching from the first stage to the second stage, there is a short current peak, which may interrupt the voltage in the existing grid

Method used

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  • Method for starting an electric motor in a hydraulically operated working machine
  • Method for starting an electric motor in a hydraulically operated working machine
  • Method for starting an electric motor in a hydraulically operated working machine

Examples

Experimental program
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Embodiment Construction

[0018] figure 1 The base state (non-operating state) is shown in which a voltage is applied to the open switch 1 via the line 8 . The delivery volume V of the hydraulic pump 13 has the value zero.

[0019] figure 2 The first control stage of the start-up process of the electric motor 6 of a hydraulic excavator (not shown in detail) with a service weight (gross weight) > 100 t is shown. Switching elements 1 and 3 are closed. The current flows through the closed switching element 1 and via the electrical lines 8 and 9 to the transformer 2 . Switching element 3 to star point 5 of transformer 2 is closed. As a result, at the branching point 7 of the transformer 2 a part of the current / electrical shunt is output via the electrical lines 10 and 12 to the electric machine 6 . In this example, the delivery volume V of the hydraulic pump 13 designed as an axial piston pump is again at the value zero.

[0020] image 3 The second control level of the start-up process is shown. ...

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Abstract

The invention relates to a method for starting at least one asynchronous electric motor of a large hydraulic excavator having a service weight > 100 t and having an electrohydraulic drive, in that the particular electric motor is transferred from an idle position to an operating position by using a three-stage motor starting process, wherein the volumetric flow rate of at least one hydraulic pump operatively connected to the electric motor is set to the delivery rate V = 0 during all starting stages of the electric motor and the delivery rate V of the hydraulic pump is controlled to a value > 0 only after the last starting stage of the electric motor by activating an actuator.

Description

technical field [0001] The invention relates to a method according to the preamble of claim 1 for starting at least one asynchronous motor of a large hydraulic excavator with a service weight (gross weight) > 100 t. Background technique [0002] DE8602103 describes a hydraulic excavator comprising: a traveling frame equipped with wheels or tracks and forming a chassis; a superstructure connected to said chassis, rotatable about a vertical axis and having at least one electric motor; and A cable connected to the chassis, the at least one motor is arranged in the chassis or the upper structure and drives at least one hydraulic pump, and the at least one hydraulic pump provides pressure medium for the hydraulic drive device. [0003] DE 19831121 A1 presents a starting circuit with a starting transformer for a three-phase short-circuited rotor motor and with contactors for adjusting a plurality of starting stages, wherein between every two starting stages in the form of volta...

Claims

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Application Information

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IPC IPC(8): F04B17/03F04B49/00F04B49/02F04B49/06E02F9/20H02P1/26H02P1/28H02K17/02
CPCE02F9/207E02F9/2075E02F9/2235E02F9/2296F04B17/03F04B49/002F04B49/02F04B49/06F04B2203/0201F04B2203/0202F04B2205/09H02P1/26E02F9/2058
Inventor H·齐普里斯S·费林格尔
Owner 卡特彼勒全球矿业HMS有限公司
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