Rotation control device of working machine
First Claim
1. A rotation control device for a working machine, the device comprising:
- an electric motor for rotatably driving a rotating body;
operation means for issuing a rotation command for rotation of the rotating body;
control means for controlling said electric motor based on the rotation command issued from said operation means;
a rotating speed detecting means for detecting a rotating speed of the rotating body; and
a mechanical brake for generating mechanical braking force, wherein said control means has a neutral range set by adding a predetermined width to an absolute neutral point serving as a basic point, the absolute neutral point corresponding to an operation amount of said operation means of zero, and in said neutral range, a mechanical brake zone is set on the absolute neutral point side, while a position holding control zone is set on a side opposite to said neutral point side, and wherein said control means is adapted to cause said mechanical brake to work in the mechanical brake zone of said neutral range, to perform position holding control in said position holding control zone, thereby stopping and holding said rotating body, and to perform speed control according to the operation amount of said operation means outside the neutral range.
1 Assignment
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Accused Products
Abstract
In a neutral range preset, there are set a zone for stopping and holding a rotating body only by a mechanical brake, a zone for holding the body only by performing position holding control, and a zone for simultaneously exerting both effects, i.e., the effect of the mechanical brake and the effect of the holding control. On-the-spot holding torque generated when the position holding control is performed is stored. The higher of the on-the-spot holding torque stored and accelerating torque according to an operation amount of the body at a rotation starting time is set as electric motor torque for acceleration. When performing a pressing work including pressing a bucket against an object for work, torque control is carried out according to the operation amount.
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Citations
18 Claims
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1. A rotation control device for a working machine, the device comprising:
- an electric motor for rotatably driving a rotating body;
operation means for issuing a rotation command for rotation of the rotating body;
control means for controlling said electric motor based on the rotation command issued from said operation means;
a rotating speed detecting means for detecting a rotating speed of the rotating body; and
a mechanical brake for generating mechanical braking force, wherein said control means has a neutral range set by adding a predetermined width to an absolute neutral point serving as a basic point, the absolute neutral point corresponding to an operation amount of said operation means of zero, and in said neutral range, a mechanical brake zone is set on the absolute neutral point side, while a position holding control zone is set on a side opposite to said neutral point side, and wherein said control means is adapted to cause said mechanical brake to work in the mechanical brake zone of said neutral range, to perform position holding control in said position holding control zone, thereby stopping and holding said rotating body, and to perform speed control according to the operation amount of said operation means outside the neutral range. - View Dependent Claims (2, 3, 4)
- an electric motor for rotatably driving a rotating body;
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5. A rotation control device for a working machine, the device comprising:
- an electric motor for rotatably driving a rotating body;
operation means for issuing a rotation command for rotation of the rotating body;
control means for controlling said electric motor based on the rotation command issued from said operation means; and
a rotating speed detecting means for detecting a rotating speed of the rotating body, said control means performing speed control according to an operation amount of said operation means and imposing a limitation on a maximum value of accelerating torque according to said operation amount, wherein, when said operation means is positioned within a preset neutral range, said control means is adapted to perform position holding control of said rotating body, to store torque generated in said electric motor by the position holding control as on-the-spot holding torque, and to set, in accelerating the rotation, the higher of said on-the-spot holding torque stored and said accelerating torque produced according to the operation amount of said operation means, as electric motor torque for acceleration. - View Dependent Claims (6, 7, 8)
- an electric motor for rotatably driving a rotating body;
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9. A rotation control device for a working machine, the device comprising:
- an electric motor for rotatably driving a rotating body;
operation means for issuing a rotation command for rotation of the rotating body;
control means for controlling said electric motor based on the rotation command issued from said operation means; and
rotating speed detecting means for detecting a rotating speed of the rotating body, said control means performing speed control according to an operation amount of said operation means, wherein, when performing a pressing work including pressing a part of said rotating body against an object of work, said control means performs torque control according to the operation amount of said operation means instead of said speed control. - View Dependent Claims (11, 13, 16)
- an electric motor for rotatably driving a rotating body;
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10. A rotation control device for a working machine, the device comprising:
- an electric motor for rotatably driving a rotating body;
operation means for issuing a rotation command for rotation of the rotating body;
control means for controlling said electric motor based on the rotation command issued from said operation means; and
a rotating speed detecting means for detecting a rotating speed of the rotating body, said control means performing speed control according to an operation amount of said operation means, wherein, when performing a pressing work including pressing a part of said rotating body against an object of work, said control means performs control to impose a torque limitation according to the operation amount of the operation means on said speed control. - View Dependent Claims (14, 15, 18)
- an electric motor for rotatably driving a rotating body;
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12. A rotation control device of a working machine, the device comprising:
- an electric motor for rotatably driving a rotating body;
operation means for issuing a rotation command for rotation of the rotating body;
control means for controlling said electric motor based on the rotation command issued from said operation means; and
a rotating speed detecting means for detecting a rotating speed of the rotating body, said control means performing speed control according to an operation amount of said operation means, wherein, when an actually measured value of the rotating speed is smaller than a target value corresponding to the operation amount of said operation means, said control means performs control to impose a torque limitation on said speed control. - View Dependent Claims (17)
- an electric motor for rotatably driving a rotating body;
Specification