H - Electricity – 02 – K
Patent
H - Electricity
02
K
318/1, 310/63, 3
H02K 41/02 (2006.01) G01P 3/52 (2006.01) G05D 3/12 (2006.01) H02K 7/20 (2006.01) H02P 7/06 (2006.01)
Patent
CA 2024666
A linear motor comprises a stator and an armature provided, respectively, with a set of spaced apart permanent magnets and a set of drive coils (not shown). The permanent magnets produce a radial magnetic field whose strength varies periodically along the length of the stator . The field strength is to derive speed and position signals by means of detectors constituted by field coils and Hall Effect sensors. The periodic variation of the field strength is compensated for in the case of the field coils by staggering their phases along the length of the armature and selectively combining their outputs; in the case of the Hall Effect sensors, the periodical variation is used to derive positional information.
Kelly Hugh-Peter Granville
Linear Drives Limited
Mccarthy Tetrault Llp
LandOfFree
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