Systems, methods, and apparatus for controlling bi-directional servo actuator with pwm control
a technology of servo actuators and actuators, applied in the direction of electric controllers, process and machine control, instruments, etc., can solve the problems of increasing the overall temperature of the control panel, and reducing the energy efficiency of the circui
Active Publication Date: 2011-11-24
GE INFRASTRUCTURE TECH INT LLC
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Benefits of technology
The invention is about controlling bi-directional servo actuators. It provides systems, methods, and apparatus for controlling the current through an actuator based on a direction control signal. The current is manipulated through one or more devices to establish a positive current path and a negative current path through the actuator. The feedback from the actuator is used to control the current, which can be based on a comparison of the feedback and a pulse width modulation signal. The technical effect of the invention is to provide a more efficient and effective way to control bi-directional servo actuators.
Problems solved by technology
Conventional servo controllers may provide the drive current for the actuators using linear buffers or linear amplifiers, which typically require bulky heat sinks to dissipate excess heat produced from the drive electronics.
When turbines have a large number of valves, each with associated actuators and LVDTs, the turbine's servo controller may become excessively bulky due to the required number and size of heat sinks for the drive circuitry.
Furthermore, when drive energy is converted to heat through the linear drive circuitry, the energy efficiency of the circuit is reduced, and the dissipated heat adds to the overall temperature of the control panel.
Method used
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[0028]Embodiments of the invention will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers refer to like elements throughout.
[0029]Certain embodiments of the invention may enable complete or partial elimination of heat sinks by replacing the linear output devices with switching amplifiers. According to example embodiments of the invention, switching devices may be provided for driving actuators associated with a turbine. In certain example embodiments, switching devices may be provided for driving excitation signals for position sensors associated with actuators. According to example e...
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Certain embodiments of the invention may include systems, methods, and apparatus for controlling bi-directional drive current through an actuator. The method may include receiving a direction control signal, manipulating one or more devices to establish at least one switchable positive current path or at least one switchable negative current path through an actuator based at least in part on the direction control signal, providing feedback based at least on current associated with the actuator, and controlling the current based at least in part on the feedback. The method may include manipulating one or more devices to establish at least one positive current path and at least one negative current path through an actuator via pulse width modulation control.
Description
RELATED APPLICATIONS[0001]This application is related to application Ser. No. ______, filed concurrently with the present application on ______, entitled: “Systems, Methods, and Apparatus for Providing High Efficiency Servo Actuator and Excitation Drivers,” the contents of which are hereby incorporated by reference in their entirety.[0002]This application is also related to application Ser. No. ______, filed concurrently with the present application on ______, entitled: “Systems, Methods, and Apparatus for Controlling Actuator Drive Current Using Bi-directional Hysteresis Control,” the contents of which are hereby incorporated by reference in their entirety.[0003]This application is also related to application Ser. No. ______, filed concurrently with the present application on ______, entitled: “Systems, Methods, and Apparatus for Controlling Bi-directional Servo Actuator Using an H-Bridge with Hysteresis Control,” the contents of which are hereby incorporated by reference in their ...
Claims
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IPC IPC(8): G05F1/10
CPCG05B11/01
Inventor CARTER, ROY ANTHONYDESAI, RAVINDRA MAHAVIR
Owner GE INFRASTRUCTURE TECH INT LLC