LINEAR MOTOR AND TRANSDUCER ARRANGEMENT THEREFOR

Title:

LINEAR MOTOR AND TRANSDUCER ARRANGEMENT THEREFOR

Document Type and Number:

WIPO Patent Application WO2005071816

Kind Code:

A3

Abstract:

An improved linear motor which compensates for manufacturing or assembly errors in the positioning of the magnetic field detectors. The linear motor synthesises a correction signal which can be simply combined (for example added) to the output of one of the magnetic field detectors so as to ensure that the magnetic field detector outputs have the correct phase relationship. This in turn ensures that accurate positioning of the rotor relative to the stator can be achieved. In a preferred embodiment, a deliberate error is introduced into the positioning of the magnetic field detectors and this error, plus any error due to manufacturing or assembly tolerances, is corrected using the correction signal. This allows a simplified correction circuit which only corrects for phase offset errors in one direction to be used.

Inventors:

ROSE IAN DAVID (GB)

Application Number:

PCT/GB2005/000254

Publication Date:

October 20, 2005

Filing Date:

January 26, 2005

Export Citation:

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Assignee:

COPLEY MOTION SYSTEMS LLC (GB)
ROSE IAN DAVID (GB)

International Classes:

G01D5/14; G01D5/244; H02K29/08; H02P6/00; H02K41/02; (IPC1-7): G01D1/00; G01D5/14; H02K29/08

Foreign References:

EP1014539A2

2000-06-28

Other References: