Wedge magnet array for linear motor

Details Wedge magnet array for linear motor Wedge magnet array for linear motor

1998-12-22

2000-08-15

Ramirez, Nestor

Electrical generator or motor structure

Dynamoelectric

Linear

310 42, H02K 4100

Patent

active

061041084

ABSTRACT:
A linear motor, suitable to drive a photolithography positioning stage, incorporates a magnet array having transverse magnets and wedge magnets. The transverse magnets are spaced at regular intervals along a direction parallel with their magnetic polarities. Each transverse magnet is linked by a closed magnetic flux circuit with two adjacent wedge magnets having magnetic polarities oriented at an angle relative to the transverse magnet polarities. The local flux direction is substantially parallel to the magnetic polarity within each magnet, effectively enhancing magnetic flux density. Magnetic flux circuits are completed directly through the magnets and not through side rails, allowing selection of stronger, lighter-weight nonmagnetic side rail material. Wedge magnets with rectangular and trapezoidal cross-sectional shapes are described. Alternative array configurations contain two rows of complementary transverse and wedge magnets spaced on opposite sides of a coil array. Paired transverse magnets spaced across from one another have opposite polarities.

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Trumper, David et al., "Magnet Arrays For Synchronous Machine", Proc. of IEEE Industry Application Society Annual Meeting Oct. 2-8, 1993 (IEEE CAT93CH3366, vol. 1 or 3 vols.).
Halbach, Klaus, "Design Of Permanent Multipole Magnets With Oriented Rare Earth Cobalt Material", Nuclear Instruments and Methods 169, (1980), pp. 1-10. (month unknown).
Halbach, Klaus, "Physical And Optical Properties Of Rare Earth Cobalt Magnets", Nuclear Instruments and Methods 187, (1981), pp. 109-117. (month unknown).

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