JPH07107718A - Permanent magnet generator - Google Patents

Abstract

PURPOSE:To increase the reluctance of a stator yoke by a governor mechanism for inhibiting a generated output at the time of the revolution at high speed of a rotary magnet generator. CONSTITUTION:A notch is formed to the section of a yoke on the outside of a stator 2 generating electromotive force by interlinking magnetic flux from a rotor 3 with a permanent magnet 31, and a moving core 4 is arranged. An arm tool 61 with a flyweight 6 and a piece 63 is installed to a disk 52 set up to a shaft 5, a collar fitting 53 fitted to the shaft 5 and the moving core 4 are bonded by a link 42, and the collar fitting 53 is biased to the outside by a spring 54. Accordingly, when the collar fitting 53 is pushed toward the inside by centrifugal force applied to the flyweight 6 at the time of the rotation at high speed of the rotor 3, the moving core 4 is slipped off from the stator 2 by the link 42, thus increasing reluctance, then inhibiting a generated output.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent magnet generator which uses a permanent magnet for a rotor and has a small change in power generation output in a range from low rotation to high rotation.

[0002]

2. Description of the Related Art Synchronous generators that use permanent magnets for their rotors are used in in-vehicle generators and the like because they have low copper loss and high efficiency.

In this type of generator, since the magnetic flux from the magnet rotor is constant, the power generation output becomes large according to the rotation speed, and it is necessary to prevent the output from becoming too large at high speed rotation and causing an overvoltage to the load. There is.

For this reason, a rotor comprising a permanent magnet and a rotating shaft are connected by a governor mechanism, and a small generator which moves in a direction in which the rotor comes out of the stator in accordance with the rotating speed is an actual open-air plane 2-146975. It is shown in the publication.

[0005]

SUMMARY OF THE INVENTION In the small generator disclosed in the above publication, the rotor is moved and separated from the stator by the operation of the governor due to the high speed rotation. Therefore, the power output from the stator is However, since a heavy rotor is moved, the mechanical constant becomes large, which is disadvantageous, and there is a problem in that the cost is increased in order to ensure the mechanical accuracy against vibration and air gap during high speed rotation.

The present invention has been made in view of the above problems, and an object thereof is to control a power output of a rotating magnet type generator at a high rotation speed without moving a rotating heavy object. An object of the present invention is to provide a permanent magnet generator that changes the resistance of the circuit and suppresses excessive output.

[0007]

In order to achieve the above object, according to the present invention, in a permanent magnet type generator for generating an electromotive force in a stator by an interlinkage magnetic flux from a rotor having a permanent magnet. , A governor mechanism attached to the rotary shaft of the rotor, a notch provided in the magnetic path of the interlinking magnetic flux of the stator, and a magnet provided in the notch that moves parallel to the rotary shaft. Provided is a permanent magnet generator including a movable iron core that increases or decreases the magnetic resistance of a road, and a link mechanism that moves the movable iron core away from the cutout portion at a high speed by a governor mechanism.

[0008]

A movable iron core for increasing or decreasing the magnetic path resistance of the yoke on the outer circumference of the stator is attached, and the movable iron core is slid by a governor mechanism provided on the rotating shaft during high speed rotation to increase the magnetic resistance of the stator. Therefore, the interlinkage magnetic flux is controlled even when the rotor rotates at a high speed, and the excessive power generation output is controlled.

[0009]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along a line perpendicular to the rotation axis.

In these drawings, reference numeral 1 denotes a generator casing, inside of which a stator 2 having a winding 21 is housed, and an outer yoke 22 is partially cut away to form a magnetic path. The movable iron core 4 having a curved cross section is attached to the cutout portion so as to be slidable in the rotation axis direction.

The rotor 3 corresponding to the stator 2 has six permanent magnets 31 which are divided into six pieces, and their magnetizations are alternately reversed in polarity as shown in FIG. A magnetic flux is generated, and a core 32 serving as an inner magnetic path is arranged in the axial direction of the magnetic flux to strengthen the magnetic force of the six magnetic poles in the outer peripheral portion.

The rotating shaft 5 is rotatably supported by bearings 11 and 12 arranged on the side wall of the housing 1, and a pulley 51 is attached to one end of the rotating shaft 5 so as to guide the torque from the engine. A disc 52 is fixed between the rotor 3 and the bearing 12, and a flange 53, which is slidable in the axial direction, is provided on the rotary shaft between the disc 52 and the rotor 3 in the spring 54.
It is pressed in the direction of the disk 52 by the elastic force of.

Reference numeral 6 denotes a flyweight of a governor mechanism, which is attached to one end of a dogleg-shaped arm 61 having a fulcrum 62 at a predetermined position of the disk 52, and has a piece 63 abutting against the collar fitting 53 at the other end. When the rotating shaft reaches a predetermined high speed rotation, centrifugal force applied to the flyweight 6 causes the bridge 6 to move.
3 presses the collar fitting 53 to press the spring 54.

Further, a link 42 is attached from the fulcrum 55 on the outer peripheral portion of the collar fitting 53 to the fulcrum 41 of the movable iron core 4 through the shaft fulcrum 56, and the shaft fulcrum 5 is supported by a predetermined portion of the housing 1. , The flange 53 is the permanent magnet 3 of the rotor 3.
When it moves in the direction of 1, the movable iron core 4 moves to the stator 2
It is structured so as to slip out of the portion of the circle 22 and slide to the position of FIG.

Next, the operation of the present embodiment thus constructed will be described. Engine runs at low speed, i.e. rotor 3
When the number of rotations is low, the centrifugal force acting on the flyweight 6 attached to the disk 52 is weak. Therefore, the piece 63 at the other end of the arm tool 61 pushes the collar fitting 53, but the elastic force of the spring 54 is strong. There is no movement of the collar member 53, so that the movable iron core 4 engaged by the link 42 does not slide and maintains the position shown in FIG. Therefore, the magnetic flux linking the permanent magnet 31 to the stator 2 at low rotation is weak, but the movable iron core 4 serves as a magnetic path in the notch of the yoke 22 of the stator 2 to efficiently generate electromotive force. Then, the power generation output is obtained.

Then, as the engine rotates at a high speed, the centrifugal force applied to the flyweight 6 becomes large, and the piece 63 provided on the arm tool 61 strongly presses the collar fitting 53 to move it. Therefore, the link 42 supported by the shaft fulcrum 56 slides the movable iron core 4 to the right as shown in FIG. 3 to increase the magnetic resistance of the yoke 22 to the stator 2 which increases at high speed. The interlinkage magnetic flux of is suppressed and the power generation output is controlled.

FIG. 4 is a curve diagram showing the relationship between the generator rotational speed and the output current. The dotted line in the figure shows an example when the governor mechanism is not operated, and the solid line shows an example when the governor mechanism is operated. .

Although the present invention has been described with reference to the above embodiments, various modifications are possible within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

[0019]

According to the present invention as in the above embodiments,
The stator of the rotary magnet type generator is cut out to increase the magnetic resistance, and a movable iron core that reduces the magnetic resistance of the cutout is attached.At the same time, a governor mechanism is provided on the rotor to move the movable iron piece according to the number of revolutions. The slide reduces the magnetic resistance at low rotation and increases the magnetic resistance at high rotation, so sufficient power generation output can be obtained at low rotation, and the power generation output can be suppressed at high rotation, which reduces weight. The effect that the excessive output can be controlled by moving the movable iron core is obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the present embodiment cut at a right angle to a rotation axis.

FIG. 3 is an explanatory diagram showing a state of a governor and a movable iron core during high speed rotation of the present embodiment.

FIG. 4 is a curve diagram showing the relationship between the generator rotation speed and the output voltage in the present embodiment.

[Explanation of symbols]

 2 ... Stater 3 ... Rotor 4 ... Movable iron core 5 ... Rotating shaft 6 ... Fly weight 22 ... Yoke 31 ... Permanent magnet 42 ... Link 53 ... Collar metal fitting 54 ... Spring

Claims (2)

[Claims] 1. A permanent magnet generator for producing an electromotive force in a stator by interlinkage magnetic flux from a rotor having a permanent magnet, and a governor mechanism attached to the rotating shaft of the rotor, A cutout portion provided in the magnetic path of the interlinking magnetic flux of the stator, a movable iron core that is provided in the cutout portion and moves in parallel to the rotation axis to increase or decrease the magnetic resistance of the magnetic path, and the movable iron core by a governor mechanism. A permanent magnet generator comprising: a link mechanism that keeps away from the cutout portion during high-speed rotation. 2. The notch is a yaw near the outer circumference of the stator.
The permanent magnet generator according to claim 1, wherein a part of the groove is cut away.