Abstract:
Especially for use in the semiconductor industry, a displacement device (701) is disclosed comprising a first part comprising a carrier (714) on which a system of magnets (710) is arranged according to a pattern of row and columns extending parallel to the X- direction and the Y-direction, respectively. The magnets in each row and column are arranged according to a Halbach array, i.e. the magnetic orientation of successive magnets in each row and each column rotates 90° counter-clockwise. The second part comprises an electric coil system (712) with two types of electric coils, one type having an angular offset of +45°, and the other type having an offset of -45° with respect to the X-direction. The first part (714, 710) is movable over a range of centimeters or more with respect to the stationary second part (712). For high precision positioning of the first part, an interferometer system (731, 730) is provided.
Abstract:
A displacement device with precision measurement with a displacement device for supporting a workpiece including an optical sensor (52); a support plate (54) defining a support plate aperture (56); a planar motor (58) disposed parallel the support plate (54), the planar motor (58) having a first side (60) operable to support the workpiece (40) and a second side (62) opposite the support plate (54); and a 2D-grating (68) disposed on the planar motor (58), the 2D-grating (68) being in optical communication with the optical sensor (52) through the support plate aperture (56).
Abstract:
An inverted planar motor employs an integration of a magnetic planar support (20) and a magnetic lift support (30), and a coil actuator (10) magnetically interactive with the magnetic planar support (20) and the magnetic lift support (30). In operation, coil actuator (10) concurrently moves the magnetic planar support (20) and the magnetic lift support (30) parallel to an XY plane of an XYZ reference frame associated with the coil actuator (10) based on a magnetic interaction between the coil actuator (10) and the magnetic planar support (20), and exclusively moves the magnetic lift support (30) orthogonal to the XY plane of the XYZ reference frame associated with the coil actuator (10) based on a magnetic interaction between the coil actuator (10) and the magnetic lift support (30).
Abstract:
Especially for use in the semiconductor industry, a displacement device (701) is disclosed comprising a first part comprising a carrier (714) on which a system of magnets (710) is arranged according to a pattern of row and columns extending parallel to the X- direction and the Y-direction, respectively. The magnets in each row and column are arranged according to a Halbach array, i.e. the magnetic orientation of successive magnets in each row and each column rotates 90° counter-clockwise. The second part comprises an electric coil system (712) with two types of electric coils, one type having an angular offset of +45°, and the other type having an offset of -45° with respect to the X-direction. The first part (714, 710) is movable over a range of centimeters or more with respect to the stationary second part (712). For high precision positioning of the first part, an interferometer system (731, 730) is provided.
Abstract:
An inverted planar motor employ a magnetic displacement device (10), and a coil actuator (20) magnetically interactive with the magnetic displacement device (10). The coil actuator (20) includes an electric coil (21) and a current amplifier (26) switchable between a K-factor measuring mode and a current measuring mode. The K-factor measuring mode includes current amplifier (26) preventing a flow of current through the electric coil (21) to facilitate a measurement of an electro motive force voltage (VEMF) indicative of a K- factor of the electric coil (21). The current measuring mode includes current amplifier (26) controlling a flow of current through the electric coil (21) and a current sensor (27) facilitating a measurement of the flow of current through the electric coil (21). The coil actuator (20) further includes a primary cooling body (25) having current sensor (27) disposed therein to stabilize a current measuring temperature of the current sensor (27).
Abstract:
An inverted planar motor employs an integration of a magnetic planar support (20) and a magnetic lift support (30), and a coil actuator (10) magnetically interactive with the magnetic planar support (20) and the magnetic lift support (30). In operation, coil actuator (10) concurrently moves the magnetic planar support (20) and the magnetic lift support (30) parallel to an XY plane of an XYZ reference frame associated with the coil actuator (10) based on a magnetic interaction between the coil actuator (10) and the magnetic planar support (20), and exclusively moves the magnetic lift support (30) orthogonal to the XY plane of the XYZ reference frame associated with the coil actuator (10) based on a magnetic interaction between the coil actuator (10) and the magnetic lift support (30).
Abstract:
A displacement device with precision measurement with a displacement device for supporting a workpiece including an optical sensor (52); a support plate (54) defining a support plate aperture (56); a planar motor (58) disposed parallel the support plate (54), the planar motor (58) having a first side (60) operable to support the workpiece (40) and a second side (62) opposite the support plate (54); and a 2D-grating (68) disposed on the planar motor (58), the 2D-grating (68) being in optical communication with the optical sensor (52) through the support plate aperture (56).
Abstract:
For ensuring high-precision control of a planar motor (1) comprising a magnet (2) and j coils (3), j=l ...N, wherein currents T7 can flow through the coils (3) such that a force and a moment are generated that interact with the magnet (2), it has been proposed to determine force and moment needed to change the relative position of magnet (2) and coils from a present position to a desired position, and then to determine the currents T7 necessary for generating this force and moment in the computing means (43) of the control unit (4) of the electric motor (1). The coil currents are then regulated accordingly with regulating means (44). The relative position of magnet (2) and coils (3) is measured with measuring means (5) and fed into the first input means (41) of the control unit (4).
Abstract:
An inverted planar motor employ a magnetic displacement device (10), and a coil actuator (20) magnetically interactive with the magnetic displacement device (10). The coil actuator (20) includes an electric coil (21) and a current amplifier (26) switchable between a K-factor measuring mode and a current measuring mode. The K-factor measuring mode includes current amplifier (26) preventing a flow of current through the electric coil (21) to facilitate a measurement of an electro motive force voltage (VEMF) indicative of a K- factor of the electric coil (21). The current measuring mode includes current amplifier (26) controlling a flow of current through the electric coil (21) and a current sensor (27) facilitating a measurement of the flow of current through the electric coil (21). The coil actuator (20) further includes a primary cooling body (25) having current sensor (27) disposed therein to stabilize a current measuring temperature of the current sensor (27).
Abstract:
Coil assemblies (2) of electric motors (1) produce heat that can be a disadvantage when needing the electric motor (1) for high precision positioning applications. To reduce the negative impact of the heat, the coils (26a, 26b, 26c) are arranged in an internally cooled housing (21). The housing (21) has an outermost layer (25) at least on the side lacing the magnet assembly (3) of the electric motor (1), the outermost layer (25) being made of low or non-electrically conductive, non-magnetic or nearly non-magnetic material. The outermost layer (25) prevents heat radiation to the environment.