| 摘要 |
<p>In a construction machine including a prime mover 22, a hydraulic pump 41 driven by the prime mover 22, a hydraulic motor 27 driven by hydraulic fluid from the hydraulic pump 41, an electric motor 25, a storage device 24 for delivering and receiving electric power to and from the electric motor 25, a controller 60 for electric motor control, the controller exercising drive control on the electric motor 25, and a speed reduction mechanism 26 for transmitting drive forces of the electric motor 25 and hydraulic motor 27 to a swing structure, wherein the controller 60 for electric motor control includes inductive voltage waveform detecting means for detecting an inductive voltage waveform of the electric motor 25, and magnetic pole position computing means for, in the state where the swing structure 2 is driven only by torque of the hydraulic motor 27, taking in the inductive voltage waveform from the inductive voltage detecting means and computing a magnetic pole position of a rotor of the electric motor 25 on the basis of the inductive voltage waveform obtained not via a rotation position sensor.</p> |
