Rotation brake method and device for working machine
First Claim
1. A method for braking a revolving superstructure of a work machine, comprising:
- employing a permanent magnet-type electric motor as a swiveling electric motor for drivingly swiveling said revolving superstructure;
in an emergency, allowing electric power generated in said swiveling electric motor due to inertial rotation to be consumed in a braking resistor outside said swiveling electric motor to provide an electric braking action, said electric braking action providing braking and decelerating the revolving superstructure; and
activating a mechanical brake when a rotation speed of the revolving superstructure becomes equal to or lower than a preset value during said decelerating.
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Accused Products
Abstract
To stop, in an emergency, a revolving superstructure quickly from rotating while preventing damage of a mechanical brake. A revolving superstructure is driven swiveling using a permanent magnetic-type swiveling electric motor; in an emergency, such as a malfunction in a drive or control system for the swiveling electric motor, allowing electric power generated in the electric motor due to inertial rotation to be consumed in an external braking resistor so as to make an electric braking action; and a mechanical brake is activated to stop the rotation and hold the stopped revolving superstructure when a rotation speed of the revolving superstructure becomes equal to or lower than a preset value.
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Citations
11 Claims
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1. A method for braking a revolving superstructure of a work machine, comprising:
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employing a permanent magnet-type electric motor as a swiveling electric motor for drivingly swiveling said revolving superstructure; in an emergency, allowing electric power generated in said swiveling electric motor due to inertial rotation to be consumed in a braking resistor outside said swiveling electric motor to provide an electric braking action, said electric braking action providing braking and decelerating the revolving superstructure; and activating a mechanical brake when a rotation speed of the revolving superstructure becomes equal to or lower than a preset value during said decelerating.
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2. A system for braking a revolving superstructure of a work machine, comprising:
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a swiveling electric motor for drivingly swiveling said revolving superstructure; a mechanical brake for mechanically braking said swiveling electric motor; a controller for controlling respective operations of said swiveling electric motor and said mechanical brake; and a speed detector for detecting a rotation speed of said revolving superstructure, wherein; said swiveling electric motor is composed using a permanent magnet-type electric motor designed to make an electric action by allowing electric power generated due to inertial rotation to be consumed in a braking resistor outside said swiveling electric motor; and said controller is adapted to allow said swiveling electric motor to make the electric braking action in an emergency, and to activate said mechanical brake, based on a speed signal generated from said speed detector, when the rotation speed of the revolving superstructure becomes equal to or lower than a preset value by said electric braking action. - View Dependent Claims (3, 4, 5, 6)
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7. A system for braking a revolving superstructure of a work machine, comprising:
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a swiveling electric motor for drivingly swiveling said revolving superstructure; a mechanical brake for mechanically braking said swiveling electric motor; control means for controlling respective operations of said swiveling electric motor and said mechanical brake; and speed detection means for detecting a rotation speed of said revolving superstructure, wherein; said swiveling electric motor is composed using a permanent magnet-type electric motor designed to make an electric action by allowing electric power generated due to inertial rotation to be consumed in a braking resistor outside said swiveling electric motor; and said control means is adapted to allow said swiveling electric motor to make the electric braking action in an emergency, and to activate said mechanical brake, based on a speed signal generated from said speed detection means, when the rotation speed of the revolving superstructure becomes equal to or lower than a preset value by said electric braking action. - View Dependent Claims (8, 9, 10, 11)
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Specification