TEMPERATURE CONTROL OF A MOVER WITH ACTIVE BYPASS, PREDICTIVE FEEDFORWARD CONTROL, AND PHASE CHANGE HOUSING
First Claim
1. A stage assembly that moves a device, the stage assembly comprising:
- a stage that retains the device;
a base assembly;
a stage mover that moves the stage, the stage mover including a magnet array that is secured to one of the stage and the base assembly, and a conductor array that is secured to the other of the stage and the base assembly, the conductor array including a first zone having a first body heat exchanger and a second zone having a second body heat exchanger, wherein current directed to conductor array creates a force that can be used to move one of the arrays relative to the other array;
a temperature controller that includes (i) an inlet valve assembly that is in fluid communication with the first body heat exchanger, and the second body heat exchanger, and (ii) a first temperature system that is in fluid communication with the inlet valve assembly, the first temperature system directing a body circulation fluid at a first temperature, and at a second temperature to the inlet valve assembly, the first temperature being different than the second temperature; and
a control system that controls the inlet valve assembly to selectively control (i) the flow rate of the body circulation fluid at the first temperature, and the flow rate of the body circulation fluid at the second temperature that is directed to the first body heat exchanger, and (ii) the flow rate of the body circulation fluid at the first temperature, and the flow rate of the body circulation fluid at the second temperature that is directed to the second body heat exchanger.
1 Assignment
0 Petitions
Accused Products
Abstract
A stage assembly includes (i) a stage; (ii) a base assembly; (iii) a stage mover, and (iv) a temperature controller. The stage mover includes a magnet array and a conductor array. The conductor array can be grouped into one or more zones. The temperature controller selectively directs a circulation fluid at a first temperature, and at a second temperature to each zone. Feedforward signals based on the expected heat dissipation of the conductor array can be used to improve the response time of the temperature controller. The temperature controller can include a phase change material and a housing assembly that retains the phase change material in an enclosed chamber near the conductor array.
31 Citations
25 Claims
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1. A stage assembly that moves a device, the stage assembly comprising:
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a stage that retains the device; a base assembly; a stage mover that moves the stage, the stage mover including a magnet array that is secured to one of the stage and the base assembly, and a conductor array that is secured to the other of the stage and the base assembly, the conductor array including a first zone having a first body heat exchanger and a second zone having a second body heat exchanger, wherein current directed to conductor array creates a force that can be used to move one of the arrays relative to the other array; a temperature controller that includes (i) an inlet valve assembly that is in fluid communication with the first body heat exchanger, and the second body heat exchanger, and (ii) a first temperature system that is in fluid communication with the inlet valve assembly, the first temperature system directing a body circulation fluid at a first temperature, and at a second temperature to the inlet valve assembly, the first temperature being different than the second temperature; and a control system that controls the inlet valve assembly to selectively control (i) the flow rate of the body circulation fluid at the first temperature, and the flow rate of the body circulation fluid at the second temperature that is directed to the first body heat exchanger, and (ii) the flow rate of the body circulation fluid at the first temperature, and the flow rate of the body circulation fluid at the second temperature that is directed to the second body heat exchanger. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A stage assembly that moves a device, the stage assembly comprising:
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a stage that retains the device; a base assembly; a stage mover that moves the stage along a first axis, the stage mover including a magnet array that is secured to one of the stage and the base assembly, and a conductor array that is secured to the other of the stage and the base assembly, the conductor array including a first zone and a second zone, wherein current directed to the conductor array generates a force on the stage; a temperature controller that selectively directs a first circulation fluid to the first zone and the second zone; and a control system that controls the temperature controller to independently control at least one of the flow rate and temperature of the circulation fluid to the first zone and to the second zone, wherein the control system utilizes feedforward control based on the expected heat load for each zone. - View Dependent Claims (13, 14, 15)
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16. A stage assembly that moves a device, the stage assembly comprising:
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a stage that retains the device; a base assembly; a stage mover that moves the stage, the stage mover including a magnet array that is secured to one of the stage and the base assembly, and a conductor array that is secured to the other of the stage and the base assembly, wherein current directed to the conductor array generates a force on the stage; and a temperature controller that controls the temperature of the conductor array, the temperature controller including a phase change material and a housing assembly that retains the phase change material in an enclosed chamber near the conductor array. - View Dependent Claims (17, 18, 19, 20, 21)
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22. A stage assembly that moves a device, the stage assembly comprising:
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a stage that retains the device; a base assembly; a planar mover that moves the stage, the stage mover including a magnet array that is secured to one of the stage and the base assembly, and a conductor array that is secured to the other of the stage and the reaction assembly, the conductor array including a plurality of conductor units that are arranged in a two dimensional array, wherein current directed to one or more of conductor units generates a force on the stage; and a temperature controller that independently adjusts the temperature of each conductor unit of the conductor array. - View Dependent Claims (23, 24, 25)
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Specification