Electrical generator or motor structure – Dynamoelectric – Rotary
Reexamination Certificate
2001-06-27
2002-03-12
Ramirez, Nestor (Department: 2834)
Electrical generator or motor structure
Dynamoelectric
Rotary
C310S06700R, C310S06800R, C310S089000
Reexamination Certificate
active
06356005
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a wheel drum structure of an inner stator portion with an inbuilt driving control circuit and, more particularly, to a wheel drum type outer rotor motor having an inner stator portion, which uses an inner ring portion thereof to build a maximal hollow space to receive a driving control circuit therein.
BACKGROUND OF THE INVENTION
As shown in
FIG. 1A
, a prior art wheel drum type outer rotor motor comprises an axial through inner hole
315
, coil wire heads/tails
419
, a magnet iron yoke ring
611
, an outer rotor housing
612
, a housing end cover plate
613
, a bearing
614
, an outer rotor magnet
615
, an inner stator
71
, and a sensing circuit board
712
.
The bottleneck of manufacturing a motor of high operational efficiency usually arises in the problem of winding an exciting coil, e.g., a winding path
713
of a winding guide needle shown in
FIGS. 1B and 1C
. For a motor to have a high operational efficiency, it must have corresponding electric load and magnetic load. The electric load relates to the thickness of wound conductor of an exciting coil of a stator. A higher electric load represents a higher exciting current. To have a higher exciting current, an exciting coil with a thicker wound conductor is required so that the higher exciting current can flow therein. To enhance the effective operational efficiency of a motor, the occupied ratio of volume of an exciting coil in a wire groove must be increased to receive stator coils of thicker wire and lower impedance, e.g., stator coils
413
shown in
FIGS. 2B and 2C
.
Additionally, a driving control circuit of a conventional wheel drum type motor is installed outside the motor. Because a guide wire connected between the driving control circuit or a detecting circuit and the motor is longer, the whole control system is easily affected. Moreover, the installed position of the driving control circuit is also a problem. If the driving control circuit is used in an electric light vehicle, the path of the guide wire between the wheel drum type motor and the driving control circuit and delicacy of the whole system must be taken into account.
SUMMARY OF THE INVENTION
In consideration of the problems of a conventional wheel drum type motor, the inner bore of a conventional inner stator portion (e.g., an inner stator
71
shown in
FIG. 1B
) is maximally enlarged (e.g., a hollow space
213
shown in FIG.
2
B). Because it is alright that magnetic conduction space at the inner bore portion is appropriate when a motor is excited, the inner bore of a stator inner ring portion can be enlarged. The enlarged hollow space can receive a driving control circuit of the motor, hence resolving the problems of disposition of the circuit, wiring engineering, and circuit disturbance. Furthermore, a root end of the stator portion can be equiangularly separated from an outer ring portion of the inner stator according to the number of wire grooves. The separated root end must correspond to the outer ring portion of the inner stator to build embedded joining ends penetrating each other. Therefore, an insulated wire groove seat of the stator root end can be formed at the outer stator coil in advance and then insulatedly disposed in a wire groove seat. This represents that the occupied ratio of volume of the stator coil in the stator wire groove can be greatly enhanced (e.g., (&thgr;2) shown in FIGS.
2
B and
2
C). A wheel drum structure of an inner stator portion with an inbuilt driving control circuit of the present invention can let a wheel drum type motor have a high operational efficiency, a high structural strength, and the characteristics of easy installation and maneuver and immune to disturbance.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawing, in which:
REFERENCES:
patent: 4659951 (1987-04-01), Angi et al.
patent: 4773829 (1988-09-01), Vettori
patent: 4883982 (1989-11-01), Forbes et al.
patent: 5083052 (1992-01-01), Ochi
patent: 5663603 (1997-09-01), Sakashita et al.
patent: 5939807 (1999-08-01), Patyk et al.
patent: 5986379 (1999-11-01), Hollenbeck et al.
patent: 6137197 (2000-10-01), Taniguchi et al.
Lam Thanh
Rabin & Berdo P.C.
Ramirez Nestor
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