Moving coil type linear motor
Patent 4641065 Issued on February 3, 1987. Estimated Expiration Date: 
May 14, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
May 14, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3452259 3619673 3917987 Linear motor Differential linear velocity transducer Moving-coil linear motor Linear DC permanent magnet motor Moving coil linear actuator Positioning table and linear motor Patent #: 4560911 InventorsAssigneeApplicationNo. 06/733775 filed on 05/14/1985US Classes:318/135, LINEAR-MOVEMENT MOTORS310/13, Fixed and movable wound elements310/27Fixed and movable wound elementsExaminersPrimary: Duggan, Donovan F.Attorney, Agent or FirmInternational ClassH02K 41/035 (20060101)Foreign Application Priority Data1984-05-16 JPAbstractA moving coil type linear motor comprises a rail of generally U-shaped cross section, permanent magnets of flat plate-shape and magnetized in the direction of thickness and provided on an inner side of the rails with varied polarities of magnetic poles next to each other. A pair of coils whose length is 1.5 times that of the magnetic pole and has a space of 0.5 times the length of the magnetic pole in the center thereof, are disposed opposingly with the permanent magnets and travel along the permanent magnets within the rail. Brushes are provided with the respective coils, and a feeder pattern arranged on an inner side of the rail, feeds electric power to the coils through the brushes, only when respective active coil parts of the coils are fully in the magnetic flux of the same direction. The linear motor also comprises sensing means for detecting signals regarding the traveling of the coils, and controlling means for controlling the travel of the coils on the ground of the signals from the sensing means. | |
