Patent ID: 9567730
Date: 2017-02-14
CPC Classifications: B60L,E02F,H02P,Y02T

Claim:
1. A work machine comprising: a swing structure; an electric motor for driving the swing structure; an electricity storage device connected to the electric motor; an inverter that controls driving of the electric motor; a swing control lever unit that issues a drive command to the electric motor as a drive command for the swing structure; a swing speed detecting device that detects rotational speed of the electric motor as swing speed of the swing structure; and a controller that controls torque of the electric motor, wherein the controller reads the swing speed of the swing structure detected by the swing speed detecting device to thereby control such that, when the swing speed is zero, the torque of the electric motor is smaller than a maximum torque value and, when the swing speed is a first rotational speed higher than zero, the torque of the electric motor is the maximum torque value.