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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: 2015-04-01
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 ...

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Abstract

An electric power accumulating means (30) includes a DC bus connected to an electric power accumulator (19) and supplies a direct current, a smoothing capacitor provided to the DC bus, and a voltage detector (23) that detects a voltage of the DC bus. The generator (12) generates an induced voltage E by being rotationally driven by an engine (11) when starting the engine (11). Degaussing of a permanent magnet of the generator is determined by performing a comparison between the induced voltage E detected by the voltage detector (23) and a previously set 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, the inner side of the stator with the coil is arranged and embedded. Figure 8 It is a block diagram showing the configuration of a tandem type hybrid excavator to which the present invention can be applied. [0004] The permanent magnets embedded in the rotor of the IPM motor are powerful magnets, but if the temperature becomes high, the magnetic force may decrease (demagnetization), and the magnetic force may gradually decay over time. If the magnetic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P6/16E02F9/20F02D29/00F02D29/04F02D29/06B60L50/10B60L50/15H02P29/00
CPCF02D29/06E02F9/2217Y02T10/6217B60Y2200/412Y02T10/7005B60L11/18B60W20/00E02F9/2025E02F9/2075Y02T10/70B60W2710/0666B60K6/46Y02T10/7077Y02T10/642B60L11/02B60W10/08H02P23/14E02F9/123E02F9/2091E02F9/2058B60L50/10B60L50/60Y02T10/62Y02T10/64Y02T10/7072E02F9/20F02D29/04H02P6/16B60W20/10B60W2300/17
Inventor 杉山祐太
Owner SUMITOMO HEAVY IND LTD