Brushless DC motor
June 26, 2015. 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 ReferencesMethod of manufacturing electrical machinery having a rotor Brushless DC motor Rotational field sensor Electric motor with rotational speed regulation Wide air gap permanent magnet motors Frame module for forming tubular frame of permanent magnet direct current motor Toroidally wound brushless DC motor Two pole permanent magnet rotor construction for toothless stator electrical machine Low damping torque brushless D.C. motor Double casing for electric rotating machine stator InventorAssigneeApplicationNo. 494405 filed on 06/26/1995US Classes:310/254, Stator structure310/44, Powdered metal310/85, Mechanical shields or protectors310/89, Housings, windows or covers310/156.25, Axially offset and radially magnetized magnets310/179, Windings and core structure310/180, Field or excitation windings or structure310/184, Plural field windings310/185, Plural sets of poles310/189, Variable length or tapped winding310/208CoilsExaminersPrimary: Stephan, Steven L.Assistant: Tamai, Karl Attorney, Agent or FirmInternational ClassH02K 037/00AbstractAn improved, brushless, slot-less DC motor is disclosed which includes a plurality of ring shaped permanent rotor magnets affixed to the motor shaft and magnetized to have contiguous pole faces extending about the circumference thereof. A module plastic housing impregnated with powder metal particles is provided as a magnetic shunt to eliminate prior art ferrite-oxide laminations while assuring concentration of the rotor's magnetic flux into coils positioned in the physical air gap between the rotor and stator housing. | |
