Rotation Control Device, Rotation Control Method and Construction Machine

• US 20080018271A1
• Filed: 07/04/2005
• Published: 01/24/2008
• Est. Priority Date: 07/05/2004
• Status: Active Grant

• Current Assignee: Komatsu Ltd.
• Original Assignee: Komatsu Ltd.
• Inventors: Inoue, Hiroaki, Morinaga, Jun
• Granted Patent: US 7,619,378 B2
• Time in Patent Office: Days
• US Class Current: 318/257
• CPC Class Codes: E02F 9/123 Drives or control devices specially adapted therefor E02F9/125 and E02F9/128 take precedence

Abstract

A control device 50 of an electric rotary excavator generates a rotation speed coefficient in accordance with a setting condition of a fuel dial 13 and a selection condition of a mode selection switch 14 and changes a value of a target speed command value based on the rotation speed coefficient to change a rotation speed of a rotary body 4. Accordingly, when the engine speed becomes low through operation of the fuel dial 13 or the mode selection switch 14, the rotation speed of the rotary body 4 can be decreased accordingly, while when the engine speed becomes high, the rotation speed can be increased accordingly. Therefore, the operation feeling substantially similar to a conventional arrangement for hydraulically rotating the rotary body 4 can be obtained, so that the operator is not confused when the operator shifts excavators from the conventional hydraulic excavator to the electric rotary excavator.

Claims

1. A rotation control device for controlling a rotary body that is rotated by an electric motor, comprising:

a target speed command generating means that is adapted to change a target speed command value of the rotary body in accordance with at least one of the following factors;

a setting condition of a fuel supply setting means for setting a fuel supply to an engine that is used in conjunction with the electric motor;

an operation amount of a work machine lever for operating a work machine that is driven by the engine; and

a selection condition of a work mode selecting means for selecting a work mode of a work performed using the work machine to set the fuel supply to the engine.

2. A rotation control method for controlling a rotary body that is rotated by an electric motor, comprising:

changing a rotation speed of the rotary body in accordance with at least one of the following factors;

a setting condition of a fuel supply setting means for setting a fuel supply to an engine that is used in conjunction with the electric motor;

an operation amount of a work machine lever for operating a work machine that is driven by the engine; and

a selection condition of a work mode selecting means for selecting a work mode of a work performed using the work machine to set the fuel supply to the engine.

3. A construction machine, comprising:

a rotary body that is rotated by an electric motor; and

a rotation control device for controlling the rotary body, wherein

the rotation control device includes a target speed command generating means that is adapted to change a target speed command value of the rotary body in accordance with at least one of the following factors;

a setting condition of a fuel supply setting means for setting a fuel supply to an engine that is used in conjunction with the electric motor;

an operation amount of a work machine lever for operating a work machine that is driven by the engine; and

a selection condition of a work mode selecting means for selecting a work mode of a work performed using the work machine to set the fuel supply to the engine.