JPS62260553A - Dc motor - Google Patents

Abstract

PURPOSE:To prevent commutation from being deteriorated and lengthen the span of life of brushes, by connecting field coils wound up on respective poles, to the brushes. CONSTITUTION:The yoke section of a motor is composed of a yoke 1, pole cores 21-24, and field coils 31-34. The respective pole cores 21-24 are wound up with respective coils 31a-34a, and coils 31a and 32a, 33a and 34a, 31b and 32b, and 33b and 34b are connected in series. Besides, the coils 31, 33 are connected to respective brushes 41, 42, and a power source 7 is connected to other side brushes 61, 62. Then, to the brushes 41, 42, all field coils 31-34 wound up on the respectove pole cores 21-24 are connected, and so even if current unbalance is generated between the brushes 41, 42, unbalance is not generated on the magnetic flux of the respective pole cores 21-24, and so unbalance is not generated on the electromotive force of an armature.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is applied to, for example, a scooter motor, and particularly relates to the connection of field coils.

[Conventional technology]

Conventionally, in order to reduce costs, field coils for starter motors have been made of several round wires wound directly around a pole core, and brush pigtails are welded directly to the terminals of the field coils. In the case of 4-pole motors or more, there are some that eliminate the crossover wire between brushes of the same voltage in order to reduce costs.

[Problem that the invention seeks to solve]

However, if the crossover wire is abolished, there is a problem that the current in the field coil tends to become unbalanced, the magnetic flux of the ball core becomes unbalanced, the electromotive force of the armature becomes unbalanced, and rectification deteriorates.

[Means for solving problems]

Therefore, the present invention provides a DC motor in which a field coil is made of a bundle of a plurality of insulated conductors and wound directly around each magnetic pole. The object of the present invention is to provide a DC motor characterized by having a field coil wound around the entire surface connected thereto.

[Effect]

Field coils wound around all magnetic poles are connected to one brush.

〔Effect of the invention〕

As described above, according to the present invention, field coils wound around each magnetic pole are connected to the brush.
This has the excellent effect of not creating an imbalance in mutual magnetic flux, preventing deterioration of rectification, and improving brush life.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention shown in the drawings will be described.

FIG. 1 is a diagram showing a yoke portion of a motor, where 1 is a yoke, 21 to 24 are ball cores, and 31 to 34 are field coils.

FIG. 2 is a wiring diagram of the field coil of the DC motor of the present invention, showing the case where the field coil is wound with two wires, 31a and 31b forming the field coil 31 wound around the ball core 21. and the following 32a
, 32b are field coils 32. 33 a, 3
3b, field coils 33, 34a, and 34b form a field coil 34, respectively.

Further, the field coils 31a, 32b are connected in series, the field coils 33a, 34a are also connected in series, and one end of the field coils 31a, 33a is connected to the brush 41, and the field coils 32a, 34a are connected in series.
is grounded.

As shown in FIG. 3, the field coil 31a,
32a is connected to the brush 41 at a welded portion 43.

The brushes 61 and 62 are also connected to the power source 7.

The brushes 41 and 42 each have ball cores 21 to 2.
Since the field coils 31 to 34 wound around the brushes 41 and 42 are all connected, even if the current is unbalanced between the brushes 41 and 42, the magnetic flux of each ball core will not be unbalanced. There is no imbalance in power, it is possible to prevent deterioration of rectification, and the life of the brush commutator can be extended.

FIG. 4 shows another embodiment of the DC motor of the present invention, in which field coils 31a to 34a and field coil 31 are wound around each ball core 21 to 24, respectively.
field coils 31a to 34b are connected in parallel, one end A of the field coils 31a to 34a is connected to the brush 41, and the other end B is grounded.

Further, one end C of the field coils 31b to 34b is grounded to the brush 42, and the other end is similarly grounded to B.

[Brief explanation of drawings]

FIG. 1 is a front view showing an embodiment of the DC motor of the present invention, FIG. 2 is an electrical wiring diagram of the DC motor in FIG. 1, and FIG. 3 is a front view showing the connection between the brush and the field coil.
FIG. 4 is an electrical wiring diagram showing another embodiment of the DC motor of the present invention. 1...Yoke, 21~24...Ball core, 31~
34...Field coil, 41.42...Brush. 5... Armature. Representative Patent Attorney Takashi Okabe 1, York 21-24, Goruko 7 31-34: Field Coil Figure 1 Figure 3 31a-14a FT-IL l'D IIL
31b-34t) ・Field coil 41.42
-・2゛Rashi Figure 2 Figure 4

Claims (1)

[Claims] In a DC motor in which a field coil is made of a bundle of insulated conductors and wound directly around each magnetic pole, a field coil is wound around all of the magnetic poles on each of a plurality of brushes that conduct electricity between the field coil and the armature. A DC motor characterized by connected coils.