JPS60162462A - Rotary field type dc motor - Google Patents

Abstract

PURPOSE:To improve the utility efficiency of a space by disposing adaptively for characteristics a permanent magnet and a conductor, respectively wound on a core. CONSTITUTION:A rotary field type DC motor is provided with an armature winding 5 annularly wound on a stator annular core 4 on the inner periphery of a housing 7, with a rotor 6 made of a field permanent magnet at the center and with a brush 8 and a current collecting ring 9 at the rotor 6. The winding 5 is energized from a DC power source 12 through a brush 10 provided on the housing 7, the ring 9 and a brush 8 provided on the rotor 6. This energization is achieved so as to produce the pole position of a stator side always at the position displaced by 90 deg. of an electric angle with respect to the pole position of the rotor 6, thereby obtaining a small-sized DC motor which continuously rotates.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a small direct current motor used for rotational power of portable equipment, etc., in which miniaturization is preferred.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The structure of a conventional example and its problems A conventional small DC motor will be explained with reference to FIG. In Fig. 1, 1 is the armature core, 2 is the armature winding,
3 is a disclosed permanent magnet. As described above, in the conventional small current electric motor, the armature rotates inside the permanent field 63. In small DC motors, permanent magnets are used as the field rather than wire-wound type because the volume of the field part is small to obtain the same magnetic flux under practical conditions. The torque 1 of a DC motor is expressed as follows.As shown in Fig. 1, as the diameter of a small DC motor is made smaller, the area that can be occupied by the armature winding 2 decreases in proportion to the square of the diameter, and the magnetic loading Although the reduction in electrical equipment is not so great, the torque decreases rapidly as the diameter becomes smaller, making it difficult to design for ultra-compact designs. In addition, from the perspective of space utilization efficiency inside the motor, the field neutral body is dead space.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to provide a rotating field type DC motor that can increase the torque obtained per unit volume and can be miniaturized.

Structure of the Invention In order to achieve the above-mentioned object, the rotating field type DC motor of the present invention includes a stator made of an annular iron core having an annular winding, and a shaft rotatably supported inside the stator and mounted in a uniaxial direction. Insulation of the rotor made of magnetized permanent magnets and the annular winding of the fixed f
! ! 1! A part of the commutator ring is peeled off in all directions, and the commutator is fixed to the rotor shaft. There is a configuration comprising a connected East-M ring and a second brush fixed to the housing and powered by an external 0-current power source to the current collector JD.

However, in order to make small DC motors even more compact, it is necessary to use space in the rotor part, which cannot be reduced in cross-section even when the diameter is reduced by one inch, to use space more efficiently than with windings. ri, only 0
(It is advantageous to use permanent magnets that can be selected from 441"l of -1, 441"l, and Ah lc
The winding part has a large surface area I! Transfer to the stator side to obtain
It is annularly wound and arranged evenly around the inner circumference of the motor housing to eliminate CIC torsion and improve the efficiency of space utilization inside the motor. J, there is a C that goes over the sea urchin.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a schematic sectional view of a rotating field type countercurrent motor in an embodiment of the present invention taken along a direction perpendicular to the axial direction, and FIG. In the cross section,
4 is a stator annular iron core, 5 is an armature winding annularly wound around the stator annular iron core 4, 6 is a rotor made of field permanent magnets, 7
8 is a motor housing, 8 is a brush fixed to the shaft of the rotor 6 and rotates together with the rotor 6, 9 is a current collector ring that is connected to each brush 8 and rotates together with the rotor 6, and 10 is for supplying power to the current collector ring 9. A brush 12 provided on the motor housing 7 is a DC power source. Further, the insulating coating of the armature winding 5 is peeled off from the portion where the brush 8 comes into contact with the brush 8, so that this portion functions as a commutator ring.

The current supplied from the external DC power supply 12 is transmitted to the rotary f6 side via the brush 10 provided on the motor housing 7 and the current collection point 9 fixedly provided on the rotor shaft, and further this current is sent to a brush 8 fixedly provided on the rotor shaft by a wire connection. The brush 8 and commutator ring always keep the magnetic pole position on the stator side at 90° in electrical angle with respect to the magnetic pole position of the rotor 6 consisting of rotating field permanent magnets.
This is for supplying power to the armature winding 5 so that it is generated at a shifted position.

The magnetic poles on the stator occur at two points on the armature winding 5 that are supplied with DC power, as shown in FIG. Therefore, the brushes 8 are separated from each other by 180 degrees in electrical angle, and the positional relationship between the magnetic poles of the permanent magnet field and the brushes 8 is such that the stator magnetic poles are separated by 90 degrees in electrical angle from the magnetic pole position of the permanent magnet field. If it is set so that it occurs at a certain position, a small DC motor that rotates continuously can be obtained.

Effects of the Invention As explained above, according to the present invention, the permanent magnet that falls within the limited space inside the small DC electric shop and the I front body wound around the iron core can be adjusted to suit the characteristics of each. The layout eliminates dead space and improves space usage efficiency.
The diameter of a small DC motor can be reduced. Therefore, in the current situation where other components of small devices, especially electronic circuits, are becoming smaller, the present invention greatly contributes to the miniaturization of the entire small devices. In addition, since the commutator ring is made by removing the insulating coating from a portion of the armature conductor, the commutator ring has a very large number of commutators.
If you shape the rectifier side so as to suppress the brush movement,
Non-spark rectification is achieved, resulting in an electric machine with less noise from other electronic components.

[Brief explanation of drawings]

Fig. 1 is a schematic cross-sectional view of a conventional small DC motor in a direction perpendicular to the axial direction, and Fig. 2 is a schematic cross-sectional view of a rotating field type DC motor according to an embodiment of the present invention. FIG. 3 is a schematic cross-sectional view along the axis of the rotating field type DC motor, and FIG. 4 is an explanatory diagram of the operating principle of the rotating field type DC motor. 4... Stator annular core, 5... Electronic Isogo winding, 6...
・Rotor, 7... Motor housing, 8, 10...
・Brush, 9...Collector ring, 12...DC power supply representative Yagi Yahiro Figure 1! Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. A stator consisting of an annular iron core having an annular winding, a rotor consisting of a permanent magnet supported internally by the fixed member and magnetized in the i radial direction, and an insulating coating of the annular winding of the stator. a commutator ring formed by peeling off a part of the ring over the entire circumferential length;
a first brush fixed on the rotor shaft and feeding power to the commutator pieces; a current collector ring connected to the first brush; and a current collector ring fixed to the motor housing and connected to the current collector ring. An opening field type DC motor equipped with a second brush that is powered from an external free-current power source.