Back to results
US 6,661,131 B2Granted
Motor and apparatus using the same motor
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorHideshi Fukutani
Life of this patent
Estimating the term…
Abstract
A motor has plural through-holes punched in a top surface of its frame. A cap made of magnetic material is placed at a location on a stator which corresponds to the through-holes, and the cap is spaced axially from the through holes. An attracting magnet is placed outside the cap. This structure allows a bearing to hold its oil, and generates attracting force in an axial direction without adversely affecting driving-magnetic-circuits. As a result, an apparatus using this motor can be low in profile and run at a high speed.
Claims9
A motor comprising:
- a bracket defining
- (i) a bearing housing unitarily formed with said bracket, and
- (ii) a mounting base for mounting the motor to an apparatus, said mounting base being unitarily formed with said bracket;
- a metal fixed to an inner wall of said bearing housing, wherein said metal is impregnated with oil;
- a stator on an outer wall of said bearing housing, said stator including a stator core with a coil therearound;
- a rotor including
- (i) a frame having in a top surface thereof through-holes,
- (ii) a shaft fixed to said frame, and
- (iii) a rotor magnet fixed to said frame,
- a cap of magnetic material facing said through-holes and spaced axially from said through-holes, said cap being spaced from an outer circumference of said metal and being axially spaced from an end face of said metal, and also being fixed at an inner circumference of said stator core;
- and
- an attracting magnet positioned outside of said cap.
9 more elements
A motor comprising:
- a bracket including a mounting base for mounting the motor to an apparatus;
- a bearing housing fixed to said bracket;
- a metal contained in said bearing housing, wherein said metal is to be impregnated with oil;
- a stator on an outer wall of said bearing housing, said stator including a stator core with a coil therearound;
- a rotor including
- (i) a frame having in a top surface thereof through-holes,
- (ii) a shaft fixed to said frame, and.
- (iii) a rotor magnet fixed to said frame;
- and
- an attracting magnet for magnetically attracting said frame, said attracting magnet being on an end face of said stator core such that said attracting magnet faces said through-holes and is axially spaced from said through-holes.
7 more elements
An apparatus comprising:
- a housing;
- and
- a motor mounted within said housing via a mounting base, wherein said motor includes
- (i) a bracket defining said mounting base and a bearing housing,
- (ii) a metal fixed to an inner wall of said bearing housing, wherein said metal is to be impregnated with oil,
- (iii) a stator on an outer wall of said bearing housing, said stator including a stator core with a coil therearound,
- (iv) a rotor including
- (a) a frame having in a top surface thereof through-holes,
- (b) a shaft fixed to said frame, and
- (c) a rotor magnet fixed to said frame, and
- (v) a cap facing said through-holes and spaced axially from said through-holes, said cap being spaced from an outer circumference of said metal and being axially spaced from an end face of said metal, and also being fixed at an internal circumference of said stator core.
8 more elements
An apparatus comprising:.
- a housing;
- and
- a motor mounted within said housing via a mounting base, wherein said motor includes
- (i) a bracket including said mounting base,
- (ii) a bearing housing fixed to said bracket,
- (iii) a metal contained in said bearing housing, wherein said metal is to be impregnated with oil,
- (iv) a stator on an outer wall of said bearing housing, said stator including a stator core with a coil therearound,
- (v) a rotor including
- (a) a frame having in a top surface thereof through-holes,
- (b) a shaft fixed to said frame, and
- (c) a rotor magnet fixed to said frame, and
- (vi) an attracting magnet for magnetically attracting said frame, said attracting magnet being on an end face of said stator core such that said attracting magnet faces said through-holes and is axially spaced from said through-holes.
9 more elements
Dependencies are inferred from the claim text.