Patent ID: 6586857
Filing Date: 2003-07-01
Classification: H02K

Abstract:
A device capable of increasing the rotation speed of a magneto motor, comprising:a magneto motor including a stator portion and a rotor portion, said stator portion having stator coil windings disposed in stator wire grooves, said wire grooves also providing a positioning device to fix and position a magnetic sensor circuit board, said rotor portion being a rotating rotor formed by a pivot, a magnetic conduction iron yoke, and a tubular arrangement of rotor magnets concentrically joined together, said tube magnet corresponding to an exciting coil of the stator portion to generate armature reaction; a plurality of magnetic sensors positioned on said magnetic sensor circuit board in respective correspondence to said rotor magnets to sense a plurality of magnetic sensing signals and output respective sensing signals, which let said stator coils correspond to variations of rotating poles of said rotor magnets; and a magnetic sensing signal selection circuit for selecting at least one of said sensing signals from said magnetic sensors through instructions of a control terminal thereof, the sensing signals of said magnetic sensors all being input to input terminals of a switch, an output terminal of said switch being provided to output the sensing signal of one of said magnetic sensors, the sensing signal output being transferred to a motor driving and control circuit to adjust a switching angle of excitation current of said stator coils for generating an armature reaction, a first of said plurality of magnetic sensors being positioned near a central angle position of adjacent stator teeth, said first magnetic sensor sensing the variations of rotating poles of said rotor magnets to adjust said switching angle of the excitation current of said stator coils for generating an orthogonal interaction between magnetic fields of said rotor portion and said stator portion and thereby maximizing a magnetic flux density in a gap between said rotor portion and said stator portion, at least a second of said plurality of magnetic sensors being positioned at a non-central angle position of said adjacent stator teeth, said second of said plurality of magnetic sensors sensing the variation of rotating poles of said rotor magnets to adjust said switching angle of the excitation current of said stator coils for generating a non-orthogonally interaction between magnetic fields of said rotor portion and said stator portion and thereby reduce said magnetic flux density in the gap between said rotor portion and said stator portion from said maximum.