Devices, systems and methods for sensing temperature of a drag cup in a rheometer motor
AssigneeWaters Investment Limited
InventorNigel Doe
Life of this patent
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Abstract
Devices, systems and methods are disclosed for sensing the temperature of a drag cup within a motor of a rheometer. Such a device includes a coil in communication with a source of current and in close enough proximity to a drag cup such that the coil senses the temperature of the drag cup through fluctuations in electrical activity across the coil.
Claims26
A drag cup motor, comprising:
- a motor core holder;
- motor windings disposed around the motor core holder;
- a drag cup surrounding and rotatable about the motor core holder;
- and
- a coil mounted around the motor core holder and in communication with a source of current, wherein the coil is in close enough proximity to the drag cup such that the coil can sense the temperature of the drag cup through fluctuations in electrical activity across the coil.
A drag cup motor in a rheometer, comprising:
- a motor core holder;
- motor windings disposed around the motor core holder;
- a drag cup surrounding and rotatable about the motor core holder;
- and
- a coil wound around a coil former that is mounted on the motor core holder, the coil being in communication with a source of current, wherein the coil is in close enough proximity to the drag cup such that the coil can sense the temperature of the drag cup through fluctuations in electrical activity across the coil.
A device for sensing the temperature of a drag cup in a motor of a rheometer, the device comprising:
- means for sensing temperature, wherein the means for sensing temperature is in contact with a source of current;
- and
- a drag cup located within a motor of a rheometer and in close enough proximity to the means for sensing temperature such that the means for sensing temperature senses the temperature of the drag cup through fluctuations in electrical activity.
A method of adjusting winding current in a drag cup motor to compensate for changes in torque due to changes in drag cup temperature, the method comprising:
- operating the drag cup motor;
- supplying current to a coil that is wound adjacent an internal periphery of the drag cup;
- determining changes in torque due to changes in temperature of the drag cup by sensing fluctuations in voltage across the coil caused by changes in temperature of the drag cup;
- and
- adjusting winding current to compensate for the changes in torque.
Dependencies are inferred from the claim text.