JPS60210156A - Rotor of magnet generator - Google Patents

Abstract

PURPOSE:To reduce the size by axially interposing a columnar magnet between a pair of pole cores integrally molded at the shaft, disposing a ring-shaped coupling member on the outer periphery of the magnet, and integrally coupling them, thereby reducing a nonmagnetic circuit to increase total magnetic flux. CONSTITUTION:A ring-shaped coupling member 9 of a nonmagnetic material is mounted on the outer periphery of a permanent magnet 4' formed in a columnar shape magnetized axially, and interposed axially between a pair of pole cores 2' and 3'. The first and second shafts 2'a, 3'a are formed integrally with the cores 2', 3', mechanically bonded by press-fitting or welding by the member 9 to form a rotor. Thus, since the rotational shaft does not pass the magnet 4', a nonmagnetic circuit decreases to reduce the size, and the manufacture of the magnet 4 becomes convenient. Further, since the mechanical strength increases, high speed rotation is enabled.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a rotor for a magnet generator having a pole core of the Landsol pole type for charging a vehicle battery.

(Prior Art) Conventionally, as shown in FIG. 1, in the rotor of a generator having permanent magnets magnetized in the axial direction, the magnet 4 is cylindrical in order to pass the shaft 2, and the shaft 2 has a cylindrical shape. Non-magnetic materials such as stainless steel are used to reduce φβ.

Since a portion of this shirt 1 becomes a non-magnetic circuit, the total cross-sectional area of the magnetic circuit is reduced and the air gap magnetic flux is reduced, and the magnet 4 is generally brittle, so it cannot withstand centrifugation during high-speed operation. There was a power issue.

In addition, in FIG. 1, 3 is a pole core, and φ is an effective magnetic flux.

(Objective of the present invention) An object of the present invention is to provide a rotor for a magnet generator in which the shaft portion of the rotor can be made smaller and the non-magnetic circuit portion of the permanent magnet can be reduced.

(Structure of the present invention) The present invention has a pair of pole cores having Ranzor-pol type magnetic pole surfaces that mesh with each other on the outer peripheral surface, and has a cylindrical permanent magnet sandwiched between the pole cores and magnetized in the axial direction. Further, each of the ball cores has a first shaft portion and a second shaft portion integrally projecting from the ball core in opposite directions in the axial direction.

and a ring-shaped connection that mechanically firmly connects the pair of ball cores on the outer peripheral surface of the permanent magnet and transmits the rotational force of the first shaft portion to the second shaft portion via the ball core. It is equipped with a member.

(Embodiment of the present invention) An embodiment will be described with reference to FIG. 2 and FIG. 3, which is a cross section taken along line m-1a in FIG.

Reference numeral 1 denotes a pulley, and 2' and 3' represent ball cores with axial vibration ability, and magnetic pole portions are arranged alternately as shown in FIG. Further, 4' is a rod-shaped permanent magnet magnetized in the axial direction. 5a and 5b are bearings, 6 is a stator core, 7 is a stator winding, and 8a and 8b are frames.

The ball cores 2' and 3' are mechanically joined by press-fitting, welding, etc., by a ring 9 which is a ring-shaped connecting member made of a non-magnetic material such as stainless steel, and this ring 9 and the ball cores 2', 3' and a rotor bearing 5a consisting of magnets 9;
It is rotatably assembled to frames 8a and 8b via 5b.

The pulley 1 is driven by a heald (not shown), and has a voltage adjustment and rectification circuit (also not shown).

Further, the ball cores 2', 3' each have first shaft portions 2'a, !, which protrude in opposite directions to each other. : It has a second shaft portion 3'a.

In this way, since the magnet 4' becomes rod-shaped, it is easy to manufacture the magnet, and space is not wasted. (Compared to the conventional example, the cross-sectional area of the magnet, which forms the magnetic circuit, is increased by about 15% without increasing the overall size.) can do.

As a result, the total magnetic flux in the air gap increases.

Furthermore, in the conventional example shown in FIG. 1, even if a non-magnetic material is used for the shaft 1, leakage magnetic flux φβ still exists, but in the present invention there is no leakage flux because there are no holes.

Furthermore, the non-magnetic ring 9 is a ball core 2'.

Since the outer periphery of the magnet 4' is wrapped in addition to mechanically coupling the parts 3' to each other, the drawback of the magnet being made of brittle material is overcome, and a generator is provided which can sufficiently handle high-speed operation.

4 and 5, which are other embodiments, will be explained.

In the embodiment shown in FIG. 2, ball cores 2' and 3' are connected by a non-magnetic ring 9, but instead of this ring 9, the entire rotor consisting of ball cores 211, 311 and magnets 4' is connected to a ring-shaped connecting member. A similar effect can be obtained even if the aluminum die-casting 9a is used for bonding.

(Effects of the Present Invention) According to the present invention, since a permanent magnet without holes can be used, a magnet with a large total magnetic flux can be obtained despite being small, and miniaturization can be achieved.

[Brief explanation of drawings]

FIG. 1 is a conventional diagram, FIGS. 2 and 3 are a partial sectional view and a tn-tn sectional view of a magnet generator showing a first embodiment of the present invention, and FIGS. 4 and 5 are a diagram showing a second embodiment. They are a partial sectional view and a V-V sectional view showing an example. 2', 3'...Ball core, 4...Permanent magnet, 2'
a...First shaft part, 3'a...Second shaft part, 9,9a・
...ring-shaped connecting part. Representative Patent Attorney Takashi Okabe Figure 1 Figure 2

Claims (1)

[Scope of Claims] A pair of pole cores having Ranzor-Pole magnetic pole surfaces that mesh with each other on their outer peripheral surfaces; a cylindrical permanent magnet held between the pole cores and magnetized in the axial direction; and from each of the pole cores. A first shaft portion and a second shaft portion integrally protruding in opposite directions in the axial direction, and the pair of pole cores are mechanically and firmly connected to each other on the outer peripheral surface of the permanent magnet, and the first shaft portion is A rotor for a magnet generator including a ring-shaped connecting member that transmits rotational force to the second shaft portion through the pole core.