Slewing-type working machine
First Claim
1. A slewing-type working machine comprising:
- a lower propelling body;
a upper slewing body rotatably provided on the lower propelling body;
an electric slewing motor causing the upper slewing body to slew, and generating regenerative braking force and regenerative electric power during slewing braking of the upper slewing body;
a electric storage device functioning as an electric power source for the electric slewing motor, and capable of being charged with the regenerative electric power to regenerate slewing energy of the upper slewing body;
electric storage device condition detecting means detecting whether the electric storage device is under a normal condition with sufficient capacity to regenerate the slewing energy or under an abnormal condition without sufficient capacity; and
control means controlling a velocity of the electric slewing motor based on a result of detection by the electric storage device condition detecting means, whereinthe control means performs a velocity limiting control for limiting a maximum velocity of the electric slewing motor when the electric storage device is under the abnormal condition.
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Accused Products
Abstract
A slewing-type working machine includes: an electric storage device capable of being charged with regenerative electric power for regenerating slewing energy of an upper slewing body while functioning as an electric power source for an electric slewing motor; an electric storage device and electric storage device controller detecting whether the electric storage device is under a normal condition with sufficient capacity to regenerate the slewing energy or under an abnormal condition without sufficient capacity; and a controller controlling a velocity of the electric slewing motor based on a result of detection by the electric storage device and electric storage device controller, wherein the controller performs a velocity limiting control for limiting a maximum velocity of the electric slewing motor when the electric storage device is under the abnormal condition.
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Citations
8 Claims
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1. A slewing-type working machine comprising:
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a lower propelling body; a upper slewing body rotatably provided on the lower propelling body; an electric slewing motor causing the upper slewing body to slew, and generating regenerative braking force and regenerative electric power during slewing braking of the upper slewing body; a electric storage device functioning as an electric power source for the electric slewing motor, and capable of being charged with the regenerative electric power to regenerate slewing energy of the upper slewing body; electric storage device condition detecting means detecting whether the electric storage device is under a normal condition with sufficient capacity to regenerate the slewing energy or under an abnormal condition without sufficient capacity; and control means controlling a velocity of the electric slewing motor based on a result of detection by the electric storage device condition detecting means, wherein the control means performs a velocity limiting control for limiting a maximum velocity of the electric slewing motor when the electric storage device is under the abnormal condition. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification