Electric swing drive control system and method
First Claim
1. A swing drive system for a machine having an upper structure rotatably associated with an under carriage, the swing drive system adapted to selectively rotate the upper structure relative to the under carriage in response to a command signal from an operator of the machine, the swing drive system comprising:
- an electric swing motor disposed to selectively receive electrical power and a torque command signal to drive a sprocket adapted to mesh with a ring gear connected to the under carriage of the machine;
a sensor associated with the swing drive system and adapted to provide a sensor signal indicative of a swing speed of the upper structure relative to the under carriage;
an electronic controller associated with the sensor and the electric swing motor, the electronic controller being operable to provide the torque command signal to the electric swing motor in response to the command signal, the electronic controller configured to;
receive the command signal;
receive the sensor signal;
provide the torque command signal to maintain a swing motion of the upper structure in response to the command signal and based on the sensor signal during a normal operating state; and
provide the torque command signal based on the sensor signal to brake the swing motion at a substantially constant rate when the command signal is indicative of a zero desired swing speed during a braking operating state.
1 Assignment
0 Petitions
Accused Products
Abstract
A swing drive system for an upper structure of a machine includes an electric motor that receives electrical power and a torque command signal. A sensor provides a sensor signal indicative of a swing speed. An electronic controller provides the torque command signal to the electric motor in response to the command signal by receiving the command and sensor signals, providing the torque command signal to maintain a swing motion of the upper structure during a normal operating state, and providing the torque command signal based on the sensor signal to brake the swing motion at a substantially constant rate when the command signal is indicative of a zero desired swing speed during a braking operating state.
-
Citations
20 Claims
-
1. A swing drive system for a machine having an upper structure rotatably associated with an under carriage, the swing drive system adapted to selectively rotate the upper structure relative to the under carriage in response to a command signal from an operator of the machine, the swing drive system comprising:
-
an electric swing motor disposed to selectively receive electrical power and a torque command signal to drive a sprocket adapted to mesh with a ring gear connected to the under carriage of the machine; a sensor associated with the swing drive system and adapted to provide a sensor signal indicative of a swing speed of the upper structure relative to the under carriage; an electronic controller associated with the sensor and the electric swing motor, the electronic controller being operable to provide the torque command signal to the electric swing motor in response to the command signal, the electronic controller configured to; receive the command signal; receive the sensor signal; provide the torque command signal to maintain a swing motion of the upper structure in response to the command signal and based on the sensor signal during a normal operating state; and provide the torque command signal based on the sensor signal to brake the swing motion at a substantially constant rate when the command signal is indicative of a zero desired swing speed during a braking operating state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for operating an electrically driven swing mechanism disposed to selectively swing an upper structure of a machine relative to an under carriage of the machine, comprising:
-
providing an electronic controller operably associated with an electric swing drive motor and configured to provide a torque command to the electric swing drive motor; providing a driving torque command to the electric swing drive motor that is sufficient to maintain a desired swing speed of the upper structure based on a command signal from an operator and based on an estimated speed of the upper structure relative to the under carriage; and providing a braking torque command to the electric swing drive motor that is sufficient to reduce a speed of the upper structure at a substantially constant rate based on the estimated speed of the upper structure relative to the under carriage when the command signal is indicative of a zero desired swing speed. - View Dependent Claims (11, 12, 13, 14, 15, 16)
-
-
17. A machine having an upper structure rotatably associated with an under carriage and a swing drive system configured to selectively rotate the upper structure relative to the under carriage in response to a command signal from an operator of the machine, comprising:
-
an electric swing motor disposed to selectively receive electrical power and a torque command signal to drive a sprocket meshed with a ring gear connected to the under carriage of the machine; a sensor associated with the swing drive system and disposed to provide a sensor signal indicative of a swing speed of the upper structure relative to the under carriage; an electronic controller associated with the sensor and the electric swing motor, the electronic controller being operable to provide the torque command signal to the electric swing motor in response to the command signal, the electronic controller configured to; receive the command signal; receive the sensor signal; provide the torque command signal to maintain a swing motion of the upper structure in response to the command signal and based on the sensor signal during a normal operating state; and provide the torque command signal based on the sensor signal to brake the swing motion at a substantially constant rate when the command signal is indicative of a zero desired swing speed during a braking operating state. - View Dependent Claims (18, 19, 20)
-
Specification