Patent ID: 6011337
Filing Date: 2000-01-04
Classification: H02K

Abstract:
A double-sided, non-iron core, brushless, axial magnetic field permanent-magnet type DC motor, comprising a shaft, a first electromagnet unit and a second electromagnet unit in parallel to each other mounted around said shaft, and a permanent magnet unit mounted around said shaft in parallel to said first electromagnet unit and said second electromagnet unit, wherein: said permanent magnet unit is allowed to rotate around said first electromagnet unit and said second electromagnet unit, comprising a plurality of permanent steel magnets equiangularly spaced around the center thereof and having their direction of magnetization disposed in parallel to said shaft, each two adjacent permanent steel magnets of said permanent magnet unit being arranged in reversed magnetic directions; said first electromagnet unit and said second electromagnet unit are respectively mounted around said shaft at two opposite sides of said permanent magnet unit and stopped from relative movement; first electromagnetic areas and second electromagnetic areas are respectively provided at said first electromagnet unit and said second electromagnet unit, the number of said first electromagnetic areas and the number of said second electromagnetic areas being equal to the number of said permanent steel magnets at said permanent magnet unit, each two adjacent first electromagnetic areas having reversed direction of magnetization and being alternatively changed, each two adjacent second electromagnetic areas having reversed direction of magnetization and being alternatively changed, said first electromagnetic areas and said second electromagnetic areas being arranged in a staggered manner, the phase difference between said first electromagnetic areas and said second electromagnetic areas being 90.degree..