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Hybrid shovel

An excavator and hybrid technology, which is applied to hybrid vehicles, earthmovers/shovels, motors, etc., can solve the problems of reducing the output of IPM motors and achieve the effect of simple structure

Inactive Publication Date: 2012-01-11
SUMITOMO HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the magnetic force of the permanent magnet embedded in the rotor decreases, the output of the IPM motor will decrease

Method used

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Experimental program
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Embodiment Construction

[0025] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0026] First, a hybrid excavator to which the present invention is applied will be described.

[0027] figure 1 Side view of a hybrid excavator. An upper revolving body 3 is mounted on an undercarriage 1 of the hybrid excavator via a revolving mechanism 2 . The boom 4 extends from the upper slewing body 3 , and an arm 5 is connected to the front end of the boom 4 . In addition, a bucket 6 is connected to the tip of the arm 5 . The boom 4 , stick 5 and bucket 6 are hydraulically driven by the boom cylinder 7 , stick cylinder 8 and bucket cylinder 9 respectively. In addition, a cab 10 and a power source (not shown) are mounted on the upper revolving structure 3 .

[0028] figure 2 yes means figure 1 A block diagram showing the structure of the drive system of the hybrid excavator. An engine 11 as a mechanical drive unit and a motor generator 12 as an auxiliary dr...

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Abstract

An electric storage means (30) comprises: a DC bus connected to a condenser (19) and supplying DC current; a smoothing capacitor connected to the DC bus; and a voltage detector (23) for detecting the voltage of the DC bus. An electric generator (12), when an engine (11) is started, is driven by the engine (11) so as to rotate and generates an induced voltage (E). The demagnetization of the permanent magnet of the electric generator (12) is determined by comparing the induced voltage (E) detected by the voltage detector (23) with a preset reference induced voltage (RE).

Description

technical field [0001] The invention relates to a hybrid excavator, in particular to a hybrid excavator whose engine is assisted by a generator. Background technique [0002] In a hybrid excavator such as a hybrid hydraulic excavator, an electric motor called an assist motor is generally driven by electric power from a battery to assist an engine (for example, see Patent Document 1). In most cases, permanent magnet motors such as IPM (Interior Permanent Magnet) motors are used as auxiliary motors. [0003] In the IPM motor, a rotor in which permanent magnets are embedded is disposed inside a stator in which coils are provided. By passing current to the coils of the stator and generating a rotating magnetic field, the rotor is rotated by the action of the rotating magnetic field and the magnetic field formed by the permanent magnets of the stator. Therefore, the rotational force of the rotor, that is, the output of the IPM motor, is proportional to the strength of the magne...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/16E02F9/20F02D29/00F02D29/04F02D29/06B60L50/10B60L50/15H02P29/00
CPCB60L11/02F02D29/06Y02T10/7005B60L11/18B60W2710/0666E02F9/2217Y02T10/6217B60W10/08E02F9/2075B60Y2200/412B60W20/00Y02T10/7077H02P23/14E02F9/2025Y02T10/642B60K6/46Y02T10/70E02F9/123E02F9/2091E02F9/2058B60L50/10B60L50/60Y02T10/62Y02T10/64Y02T10/7072E02F9/20F02D29/04H02P6/16B60W20/10B60W2300/17
Inventor 杉山祐太
Owner SUMITOMO HEAVY IND LTD