VALVE ACTUATORS
First Claim
Patent Images
1. A valve actuator, comprising:
- a drive shaft, which, in use, is configured to adjust a valve between an open position and a closed position;
an AC induction motor configured to drive the drive shaft;
a contactless position sensor, which, in use, configured to output a signal representing an angular position of the drive shaft or the valve; and
a controller configured to control the AC motor in accordance with the signal output by position sensor.
2 Assignments
0 Petitions
Accused Products
Abstract
A valve actuator having a drive shaft, which, in use, is configured to adjust a valve between an open position and a closed position, an AC induction motor for driving the drive shaft a contactless position sensor configured to, in use, output a signal representing an angular position of the drive shaft or the valve, and a controller configured to control the AC motor in accordance with the signal output by position sensor.
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Citations
21 Claims
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1. A valve actuator, comprising:
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a drive shaft, which, in use, is configured to adjust a valve between an open position and a closed position; an AC induction motor configured to drive the drive shaft; a contactless position sensor, which, in use, configured to output a signal representing an angular position of the drive shaft or the valve; and a controller configured to control the AC motor in accordance with the signal output by position sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 20, 21)
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16. A valve actuator controller, comprising:
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a device configured to receive a signal from a contactless position sensor, the contactless position sensor being configured to, in use, output a signal representing an angular position of a drive shaft or a valve; and a device configured to control an AC induction motor, the AC induction motor being configured to, in use, drive the drive shaft, in accordance with the signal output by position sensor.
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17. A method of operating a drive shaft, the drive shaft being configured to, in use, adjust a valve between an open position and a closed position, the method comprising:
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receiving a signal from a contactless position sensor configured to, in use, output a signal representing an angular position of the drive shaft or the valve; and controlling an AC induction motor, which, in use, is configured to drive the drive shaft, in accordance with the signal output by position sensor.
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18-19. -19. (canceled)
Specification