JPS58198156A - Frequency generator - Google Patents

Abstract

PURPOSE:To improve the generating efficiency of a frequency generator by forming 2n pieces of small projections per one pole of a permanent magnet at an equal pitch on the surface of the permanent magnet which is opposed to an armature coil. CONSTITUTION:A rotor is composed of a permanent magnet 9 which is magnetized totally in number P alternately at N poles and S-poles circumferentially at an equal pitch. An armature coil 11 is composed by connecting generating strands of (2n+1)XP pieces radially arranged in series with each other. Further, 2n pieces of small projections d1 are formed on all poles in the prescribed height t at the same pitch as that of the generating strands of the coil 11. In this manner, the generating voltage can be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a frequency generator, in particular a rotor consisting of nine permanent magnets magnetized alternately with N and S poles at equal pitches in the circumferential direction, and a plurality of permanent magnets arranged in the radial direction. An armature winding made up of power generating wire elements connected in series is disposed opposite to the rotor with a gap in between, and an alternating current voltage with a frequency proportional to the rotational speed of the rotor is generated in the armature winding. This paper concerns the improvement of frequency generators.

An object of the present invention is to obtain a frequency generator whose output voltage can be increased with a simple construction.

The frequency generator of the present invention has N poles S at equal pitches in the circumferential direction.
A permanent magnet whose poles are alternately magnetized to a total of P poles is used as a rotor,
is (2n+x)xP books arranged in the radial direction (however, n
A tm child winding consisting of power generation line elements of =1*2t3 (positive integer) connected in series is arranged opposite to the rotor through a gap, and this armature winding KL7 to generate an AC voltage with a frequency proportional to the rotation speed of the rotor.
The h-frequency generator is characterized in that 2n small protrusions are provided on the surface of the permanent magnet facing the armature winding at equal pitches and with equal thickness for one pole of the permanent magnet. do.

Embodiments of the conventional frequency generator and the present invention will be described below with reference to the drawings.

FIG. 1 (JL) shows a cross-sectional view of a flat motor equipped with a frequency generator according to the present invention, in which 1 is a stator yoke that also serves as the outer case of the motor, and 2 is a nine bracket fixed to this stator yoke 1. , 3 is a stator winding of the motor fixed to the stator yoke 1, 4 is an insulating plate on which the stator winding 3 and the frequency generator are attached, 6 is a rotor shaft, 5 is a bearing thereof,
8 is a rotor yoke, 9 is a permanent magnet fixed to the rotor yoke 8, 7 is a boss of the rotor consisting of the rotor yoke 8 and the permanent magnet 9, and 10 is a space between the insulating plate 4 and the permanent magnet 9. The air gap 11 is attached to the insulating plate 4 and is an armature winding of a nine-frequency generator.

Figure 1) is a detailed view of the armature winding 11 of the frequency generator mounted on the insulating plate 4, and the armature winding 11 extends radially from the center in the (2n+1)X ' P power generation line elements 11-1 (where n = 11213 - the number of positive curves, P is the number of poles of the permanent magnet) are arranged at equal pitches in the circumferential direction, and the power generation line elements are arranged adjacent to each other. Both ends of the round wire are connected alternately with the outer connecting wire 11-2 and the inner connecting wire 11-3, and all the generating line elements are connected in series, and the terminals A and B are drawn out to the outside. An alternating current voltage with a frequency more proportional to the rotational speed of the permanent magnet is taken out, and this voltage is applied as a speed feedback signal to the speed control circuit of the motor to control the speed of the motor to match the set speed.

FIG. 1(e) is an explanatory diagram showing the state of magnetization of the permanent magnet 9. For example, the permanent magnet 9 is magnetized into six poles in total, with N and S poles alternately arranged at equal pitches. The magnetic flux flows in a direction penetrating the plane of the paper. Power generation line element 1
The number of 1-1 is (2n+1)×2, n=2. Taking the case of P=6 as an example, the number of power generation line elements is (2X2+1)X6=3
There are 0 pieces.

In order to explain the operation of this generator, a developed diagram showing the relationship between the armature winding 11 and each magnetic pole of the permanent magnet 9 is shown in FIG.
). FIG. 2 Φ) is an explanatory diagram showing a linear magnetic flux distribution of a permanent magnet.

The neutral wire of each magnetic pole of the permanent magnet is numbered n-1 to n-6, and the conductors of the armature winding 110 generating line elements are numbered 1 to 30. In Fig. 2 41), (b), if the permanent magnet rotates in the direction of the → mark, six of the conductors 1 to 30 of the power generating line element, 1, 6, 11, 16, 21°26 The conductor is the neutral line n-1r n-2tn-Ln between each a pole of the permanent magnet.
-4+n-Ln-6 and move relative to each other, the magnetic flux interlinking with each conductor changes rapidly from N pole to S pole, or from S pole to S N pole. An electromotive force according to dφ −eLTTK is generated in each conductor, and the conductor is 1.6
The conductors 111, 16, 21, and 26 are all connected in series so that each conductor is in the opposite direction, and the direction of change in the interlinking magnetic flux is opposite, so the magnetic flux generated in each conductor is The directions of the electromotive forces match, and the voltage generated at terminals A and H is the sum of the voltages induced in each conductor. On the other hand, the above conductors i, 6,
11゜16.21.26 The state of interlinkage between the magnetic flux generated by the permanent magnet and other conductors does not change as shown in the magnetic flux distribution in Figure 2 φ), so no induced voltage is generated. do not have.

Next, the permanent magnet continues to rotate, and when the neutral wire n-1 reaches a position facing the conductor 2, the conductors 2, 7, 12.1
7, 22.27 are the neutral wires of the permanent magnets n-1+ n-
2+ n-3r n-4+ n-5+ Opposed to n-6 d
φ, the interlinkage magnetic flux suddenly changes, nine electromotive forces are generated according to each conductor'-eL-a7, and the sum of all electromotive forces appears at terminals A and B. In this way, in the frequency generator having the structure shown in Fig. 1 (&) to (e), the neutral wire of the permanent magnet and the conductor of the opposing power generating S element are opposed to each other (... An electromotive force is generated in the conductor, and the direction of the electromotive force becomes an alternating voltage that is reversed for each conductor.The frequency f of this alternating current voltage is determined by the number of generating line elements being C and the rotation speed of the permanent magnet being N(r, p, rn), it can be expressed as N f-ton × bacteria (Hz), and since the frequency f of the output voltage is proportional to the rotational speed of the motor and the number C of generating line elements, the speed of the motor In order to increase the frequency of the generator in order to improve the quality of control, it is sufficient to arrange a large number of generating line elements, and when the number of poles of the permanent magnet is increased, the number of conductors interlinked with the neutral wire also increases. It has the advantage that the generated voltage can be increased because it increases in proportion to .However, if the permanent magnet is used in common with the permanent magnet of the motor, the number of poles of the permanent magnet cannot be increased too much because it is determined by the characteristics of the motor. The number of conductors that help generate voltage in the power generation wire element of the armature winding is only the same number as the number of poles of the permanent magnet, and the other conductors are at rest, which has the disadvantage of poor power generation efficiency. .

The present invention solves the problems of the conventional generators as described above and provides a frequency generator with high power generation efficiency.

In the first embodiment of the present invention, as shown in FIG. 3(a), the generating line element 11-1 of the electric machine pre-winding@11 is placed on the surface of the permanent magnet 9 facing the generating line element of the magnetic pole. 2 at the same pitch as the pitch
N small protrusions d1 are provided on all magnetic poles so as to have a constant height t.

Since the frequency generator of the present invention has the above-described configuration, the distribution of magnetic flux interlinking with the opposing power generation line elements is as shown in FIG. 3(b), and between the neutral lines n-1 and n-2, The magnetic flux is not uniform, and the magnetic flux is large in the part with the small protrusion d1, and the magnetic flux is less in the part d, where there is no protrusion, and there is a sudden change point in the magnetic flux where the magnetic flux increases or decreases at the same pitch as the pitch of the conductor of the power generation line element. is composed of δ
Therefore, in the generator with the configuration shown in Figure 3(a), the conductors that are useful for generating voltage due to the rotation of the permanent magnet are the conductors other than conductors 1, 6, 11, 16, and 21, 26 that face the neutral line. Conductor 2.
3, 4.5 - 27.28, 29.30 also face the step part of the small protrusion d1 of the permanent magnet, and the magnetic flux to -da changes suddenly, so an electromotive force of dφ "7T" is generated in this conductor as well. This electromotive force is the neutral −
Since the direction is the same as that of the electromotive force generated in the conductor facing the conductor, there is an advantage that all the electromotive forces are added together and the output voltage increases. However, since the protrusion is provided on the surface facing the permanent magnet me slave winder, the average length of the air gap increases and the magnetic flux interlinking with the armature winding decreases, so the increase in output voltage remains flat. This is 30 degrees stronger than conventional generators with permanent magnets. However, it has a significant effect on improving the taste of the control circuit. Moreover, providing such projections on the surface of the magnetic pole can be easily manufactured using a plastic magnet or the like.

In the second embodiment of the present invention, the magnetic pole surface of the permanent magnet 9 is formed flat as shown in FIG. For each magnetic pole, 2n small protrusions Q are brought into contact with and fixed to a magnetic material such as iron with the same height t at the same pitch as the power generating line elements.

In this embodiment, as in the embodiment of FIG. Since the other conductors also face the step between the small protrusion made of magnetic material fixed to the surface of the permanent magnet and the surface of the permanent magnet, the interlinkage magnetic flux changes suddenly and an electromotive force is generated, which is generated in all the conductors. Since the directions of the electromotive forces are uniform, they are added together and the output increases. In the embodiment shown in Fig. 4 (jL), since the small protrusion Q is provided on the facing surface of the permanent magnet, the average gap increases and the average magnetic flux decreases, resulting in an increase in the output voltage of approximately 30 It is about %.

In the 30th embodiment of the present invention, FIG. 5 (JL), (
b) As shown in K, a layer used when magnetizing the permanent magnet 9 to flow a magnetizing current to the magnetizing yoke 12 f71i Kawahiro body l
In addition to #lS that accommodates #3, there are 2n grooves R per permanent magnet l pole with the same pitch as the generating line element facing the threshold between grooves S and S.
is provided with a uniform depth t, and a magnetizing conductor 13 is placed in this groove R.
is not provided, but the surface of the Mizuku wa 9 to be magnetized is brought into close contact with the surface provided with the grooves S and @R, and the magnetization conductor 13 is tl! ,
Let the current flow through it and magnetize it. If it shifts like this, the permanent magnet 9
In addition, it is possible to form a layer with a magnetic flux distribution as shown in FIG. 5(c).

In the embodiment shown in Figures (&) and (b), a gap is created between the permanent magnet 9 and the magnetizing yoke 12 in the part where the groove R is provided, and the magnetizing current is not applied to the magnetizing conductor 13. Groove R when flowing
The result is that the magnetizing force of the part of the permanent magnet 90 that faces decreases #
The magnetic flux distribution will be as shown in Figure c5 (C).

In this embodiment, as in the first and second embodiments of the present invention, all the conductors of the power generating line element serve to generate voltage, so the output voltage is added and there is an effect of increasing the generated voltage. Unlike the other embodiments shown in FIGS. 3 and 4, there is an advantage that there is no need for a separate material component such as a permanent magnet provided with a protrusion or other material for abutting and fixing the protrusion of another magnetic material.

[Brief explanation of the drawings] Figure 1 (1) is a cross-sectional view of a nine-piece flat motor equipped with a frequency generator, Figure 1 (b) is a plan view for explaining its armature windings, and Figure 1 ( c) is an explanatory diagram of the magnetized state 11 of the permanent magnet of the rotor, and FIG. 2(a) is a developed diagram showing the correlation between the armature winding of a conventional frequency generator and each magnetic pole of the permanent magnet. ! 2
Figure (b) is an explanatory diagram showing the magnetic flux distribution of the permanent magnet in a linear form, and Figure 3 (a) is a development showing the correlation between the armature winding of the frequency generator of the present invention and each magnetic pole of the permanent magnet. Figure, Figure 3 (b
) is an explanatory diagram showing the magnetic flux distribution of a permanent magnet in a linear form.
Figure 4(b) is a developed view showing the relationship between the armature winding and each magnetic pole of the permanent magnet in another embodiment of the present invention.
5(a) is an explanatory diagram of the magnetic flux distribution of the permanent magnet, FIG. 5(a) is an explanatory diagram of the magnetized state of the permanent magnet in yet another embodiment of the present invention, and FIG. 5(b) is the plane of the warp magnetizing yoke. Figure, Figure 5(e)
is an explanatory diagram of magnetic flux distribution of a permanent magnet. 1... Stator yoke, 2... Bracket, 3...
Stator winding, 4... Insulating plate, 5... Bearing, 6...
Rotor thin, 7... Rotor boss, 8... Rotor yoke, 9... Permanent magnet, 10... Air gap, 11...
Armature winding, 11-1...Generating wire element, 11-2...
Outside crossover wire, 11-3...Inner Iltshi wire, 12
... Magnetizing yoke, 13... Magnetizing conductor, R, S.
...Groove, A, B...Trail, n-1 to n-6...Neutral wire, 1 to 30...Conductor, f...Frequency, C...Number of power generation line elements , N... Number of rotations of permanent magnet, d,... Small protrusion, d! ...Part without protrusion, Q...Small protrusion, t
...height, [, ...height, t, ...depth. +1 (0) (b) (C)

Claims (1)

[Claims] (11 Alternating north and south poles at pitches in the circumferential direction! rtP
The rotor is a permanent magnet magnetized to the poles, and (2n+1)xP pieces are arranged in the radial direction (however, n-1, 2, 3,
An armature winding consisting of power generation wire elements connected in series (a positive integer) is disposed opposite the rotor through a gap, and the rotor is connected to the armature winding. In a frequency generator that generates an alternating current voltage with a frequency proportional to the rotation speed, 2n small protrusions are provided for one pole of the permanent magnet on the surface of the permanent magnet facing the armature winding. A frequency generator characterized by being installed at equal pitches and at equal heights. (2) The frequency generator according to claim 1, wherein the small protrusions are formed by a magnetic material other than a permanent magnet material being brought into contact with the permanent magnet. Pitch alternates between north and south poles, total P
A permanent magnet with magnetized poles is used as a rotor, and A(Zn+))XP pieces are arranged in the y radial direction (where n=1.2.3.
An armature winding consisting of power generation wire elements of . In a nine-frequency generator that generates an alternating current voltage with a frequency proportional to the rotational speed of the generator, 2n conductors for one pole are not accommodated between the grooves that accommodate the conductors through which the magnetizing current flows. A frequency generator that uses permanent magnets magnetized by nine magnetized yokes with grooves arranged at equal pitches and equal depths.