Patent ID: 8869519

Claim:
A hybrid-type shovel comprising: an engine; a hydraulic pump driven by an output of the engine; a boom drive hydraulic cylinder and an arm drive hydraulic cylinder that are driven by hydraulic pressure supplied from the hydraulic pump; a generator coupled to the engine and generating electric power by revolution of said engine; an electric power accumulating means that supplies electric power to the generator; and a turning motor connected to said electric power accumulating means via an inverter to drive a turning mechanism, wherein said electric power accumulating means includes a DC bus connected to an electric power accumulator and supplies a direct current, a smoothing capacitor provided to the DC bus, and a voltage detector that detects a voltage of the DC bus; said generator generates an induced voltage by being rotationally driven by said engine when starting said engine; and a means for determining degaussing of a permanent magnet of said generator by performing a comparison between the induced voltage detected by said voltage detector and a previously set reference induced voltage.