Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1991-03-20
1992-12-22
Voeltz, Emanuel T.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 67R, 310217, H02K 1100, H02K 714, H02K 118
Patent
active
051736284
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a brushless motor, and in further detail to a brushless motor improved in the connection between a stator coil and a circuit substrate.
2. Background Art
There has been a conventional motor with a core opposed to a peripheral magnet in which, as shown in FIG. 14 or 15, a lead 19 from a stator coil 18 wound to a stator core 17 is directly connected with solder to a circuit board 20. Soldering this lead 19 to the circuit substrate 20 requires adjustments, such as positioning of the lead 19, adjusting its length and the like, which is manually conducted. As a result, in the conventional motor construction, the lead 19, as similar to other electronic parts, can not be automatically mounted on the circuit substrate 20. Also, with increased phase number of the coil 18, the soldering work will be time-consuming and reliability of the motor decreases. In addition, the conventional motor is directly soldered to the circuit substrate 20 without midsection of the lead 19 supported, posing a possibility of the lead 19 being easily cut due to motions of associated parts, or vibration, shocks of the same, or the like. Consequently, the conventional motor is poor in reliability.
In further defective aspect, connecting the lead 19 with a terminal in three-phase winding shown in FIG. 16 will probably require to insert the three leads 19, 22, 23, respectively of U, V and W phases, into a common terminal 21 as shown in FIG. 17. In that case, however, the terminal 21, in which those leads 19, 22, 23 are inserted, is naturally greater in dimensions, and further, to fix all the leads 19, 22, 23, the winding end of first phase is temporarily fixed, then likewise is done that of second phase, and subsequently, when the winding end of third phase appears, all of the three leads have to be simultaneously inserted into the terminal 21 and clamped together, which thus results in a troublesome work.
DISCLOSURE OF THE INVENTION
An object of the invention is to provide a brushless motor which can improve efficiency of operation. More specifically, it is a first object of the invention is to not only permit automatic connection of stator coils but also eliminate steps for disposing of the coils after they have been wound; it is a second object of the invention to enable automatic mounting of a set of stator formed by a stator core and stator coils wound thereon onto a substrate, as with other electronic parts, during circuit assembling process; and it is a third object of the invention to permit such stator set to be fixed to the substrate by means of reflow soldering, as with other electronic parts.
To achieve the above-stated objects, the present invention provides a brushless motor including a rotor having a rotor magnet, a stator core with a coil wound thereon, the stator core being disposed in a facing relation with the rotor magnet, and a substrate connected with the coil, wherein a terminal area is formed only on a surface of the substrate facing toward the stator core, wherein there is provided a core holder made of an insulating material, to which the stator core is coupled as well as which retains a terminal connected with the coil, and wherein the core holder is placed upon the substrate by securing a locating pin formed integrally with the core holder into the substrate and locating the core holder in place thereon, while simultaneously the terminal is placed on the terminal area of the substrate and the terminal is soldered to the terminal are on the substrate.
Accordingly, since in the brushless motor of the invention, the end of the stator coil forming a winding is automatically connected with the terminal, without changes, there is no hitherto requirement for manual connection of associated leads subsequent to the winding of the coil and thus the assembling processes are simplified. This makes possible use of electric resistance welding to fix the leads to the terminal, which will render easier and assured the connection of the leads with the terminal, pr
REFERENCES:
patent: 4633110 (1986-12-01), Genco et al.
patent: 4673834 (1987-06-01), Wrobel
patent: 4682065 (1987-07-01), English et al.
patent: 4779330 (1988-10-01), Genco et al.
patent: 4800307 (1989-01-01), Papst
Sakashita Hiroshi
Yoshida Norihide
Kabushiki Kaisha Sankyo Seiki Seisakusho
LaBalle C.
Voeltz Emanuel T.
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