JPS62178146A - Brushless generator - Google Patents

Abstract

PURPOSE:To enhance reliability, by arranging non-winding grooves for the winding grooves of a stator in a brushless speed generator. CONSTITUTION:A brushless speed generator is provided with a rotor, a stator core 2, and the like, and the four C-type field magnets 1 are fitted at equal intervals on the circumference of a rotary shaft 5. Twelve winding grooves 3 at equal intervals on the stator core 2 are wound up with three-phase and four-pole windings, and between the grooves 3, two auxiliary grooves 4 are arranged at equal intervals. The stator core 2 is skewed at one slot pitch (2pi/36) to be laminated so that generating induced voltage cannot be distorted by the grooves 3, 4. Then, by rotating the rotary shaft 5, voltage similar to magnetic flux distribution is induced to respective phase windings.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a brushless generator using a magnet as a rotor field.

BACKGROUND OF THE INVENTION An example of a conventional brushless speed generator (hereinafter referred to as BLTG) will be described below with reference to the drawings.

FIG. 4 is a main configuration diagram of a conventional BLTG as seen from the axial direction of the rotor and stator cores.

The four C-type field magnets 1 are mounted on the circumference of the rotating shaft 5 at equal intervals. As shown in the figure, the polarity of the field magnet 1 is such that N and S poles are arranged alternately.
The magnetic flux distribution on the circumference of each polar field magnet 1 shown in the figure is a trapezoidal distribution.

The 36 winding grooves 7 of the stator core 6 are provided with three-phase, four-pole windings vA (not shown), and these windings are concentrated windings with 9 slot pitches for each pole. The stator core 6 is laminated with a skew of 1 slot pitch (2π/36) as shown in FIG. 5 so that the generated induced voltage is not distorted by the winding grooves 7, and the rotating shaft 5 can be rotated. Therefore, a voltage similar to the magnetic flux distribution is induced in each phase winding as shown in FIG. 3, and the induced voltage outputs a generated voltage value having an electrical angle of 2π/3=120°e1. By combining the windings of the three-phase configuration, the DC voltage per rotation is determined by BL.
Let it be TG voltage.

Problems to be Solved by the Invention In the conventional BLTG, a skew of one slot pitch is implemented to prevent the generated induced voltage from being distorted, and the number of grooves used in the three-phase, four-pole winding is 3×4=1.
2, 36-12 = 24 grooves are not used, and the surface resistance of one groove is small, so if you want to increase the induced voltage, you will need to increase the number of turns of the winding, but It is necessary to reduce the diameter of the wire, and there is a possibility of wire breakage during manufacturing and use, reducing reliability.

Also, since the number of grooves used is 12, the number of grooves in the stator core 6 is reduced to 1.
If set to 2, - pole slot pitch 12 slots/4
This is pole -3, but the stator core 6 is skewed by one slot pitch to prevent the induced voltage from being distorted.
The maximum angle of the constant value part of the maximum value of the induced voltage is 90°X-30° in mechanical angle (60° in electrical mechanical angle), making it impossible to extract the DC voltage for each rotation.

In order to solve the problem mentioned above, it is possible to increase the number of phases, but when the number of phases is increased, it is necessary to increase the number of ω-ray grooves 7 in the stator core 6, and the number of grooves per groove is As the surface bond becomes smaller (1 bit becomes larger), it becomes necessary to increase the switching change of each phase per rotation in proportion to the increased number of phases, and the reliability of the device decreases. .Therefore, the present invention has the following features:
Our goal is to provide highly reliable BLTG.

Means for Solving the Problems The present invention has a rotor consisting of P field magnets arranged at equal intervals on the circumference of a rotating shaft, and N winding grooves arranged at equal intervals. In the BLTG, the stator core is equipped with a stator core formed by vtM of an iron plate having M small auxiliary grooves equidistantly spaced between the N winding grooves. is skewed by 2π/(N+NM) pitches.

Effect The present invention has the following configuration, which allows the winding groove to be made thicker, reduces the number of winding phases, and increases the wire diameter of the winding, resulting in a highly reliable BLTG. It provides:

Embodiment FIG. 1 shows a main configuration diagram of a rotor and stator core of a BLTG according to an embodiment of the present invention.

The four C-type field magnets 1 are mounted on the circumference of the rotating shaft 5 at equal intervals. As shown in the figure, the polarity of the field magnet 1 is such that N-3 poles are arranged alternately.
As shown in the figure, the magnetic flux distribution on the circumference of the various field magnets 1 has a trapezoidal distribution.

The 12 equally spaced winding grooves 3 of the stator core 2 are provided with three-phase, four-pole windings (not shown).
There are two auxiliary grooves 4 at equal intervals between the stator core 2.
are laminated with a skew of one slot pitch (2π/36) as shown in FIG. 2 so that the induced voltage generated by the grooves 3 and 4 is not distorted.By rotating the rotating shaft 5, each phase winding is As shown in Figure 3 (a voltage similar to the magnetic flux distribution is induced, and the constant value part of the maximum value of the induced voltage is 2π/3
By extracting the voltage at =120° (Ti, air angle) and making connections to synthesize each phase, a DC voltage for each rotation is output and used as the BLTG voltage.

Effects of the Invention The present invention provides a method for skewing the stator core by artificially increasing the number of slots for each pole by providing grooves in which no wire is wound in the stator in contrast to the grooves for winding in the stator. By reducing this skew angle, it is possible to make the winding groove thicker and the winding wire diameter thicker.
can be provided.

[Brief explanation of drawings]

Fig. 1 is a main configuration diagram of the rotor and stator core of a BLTG in an embodiment of the present invention, Fig. 2 is a developed view of the stator seen from above the circumference of the rotor in Fig. 1, and Fig. 3 is a main configuration diagram of the stator core. Magnetic flux distribution diagrams of the rotor field magnets of the invention and the conventional example, Fig. 4 is the main (R diagram) of the rotor and stator core of the BLTG in the conventional example, Fig. 5 is the rotor circumferential side of Fig. 4. It is a developed view of the inner circumferential surface of the stator seen from a closer perspective. 1... Rotor C-shaped magnet, 2...
Stator core, 3... Winding groove, 4...
Auxiliary groove, 5...Rotation axis. Name of agent: Patent attorney Toshio Nakao and one other person Figure 2. ■＠Tsuchikaji Figure 4 2'1″S 5 Figure

Claims (1)

[Claims] A rotor consisting of P field magnets arranged at equal intervals on the circumference, and N winding grooves arranged at equal intervals,
a stator core comprising laminated stator iron plates having M small auxiliary grooves equidistantly spaced between the N winding grooves, the laminated fixing A brushless generator in which the groove of the child core is skewed by a pitch of 2π/(N+N·M), and the winding is provided in the winding groove.