JPH1052007A - Magnetized yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the workability and safety by arranging magnetic field generating coils on both the outer and inner peripheries of the magnetized yoke of a rotor for a large-sized synchronous motor provided with a plurality of permanent magnets incorporated in the inner periphery of a ring-like magnetic yoke. SOLUTION: A pulse magnetic field generating coil is composed of an inner peripheral coil 1 arranged on the inner periphery of a rotor and an outer peripheral coil 2 arranged on the outer periphery of the rotor. When the pulse magnetic field generating coil is constituted in a hollow state, the coils 1 and 2 are respectively positioned at distances of 0-5mm from the surfaces of magnets 5 and a ring-like magnetic yoke 4 and the arranging intervals C1 and C2 of the coils 1 and 2 are made longer than the inner and outer peripheral widths M1 and M2 of the magnets 5 by 0-40mm so that generated magnetic fields can effectively flow to the magnets 5. In addition, the lengths C3 of the coils 1 and 2 are made longer than the lengths M3 of the magnets 5 by 0-40mm. The permanent magnets 5 (unmagnetized) are fixed by sticking, for example, 6-12 pieces of magnets with an adhesive or spacers when the diameter of the ring-like magnetic yoke is 400mm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetized yoke capable of easily manufacturing a magnet rotor for a large permanent magnet type synchronous motor exceeding several tens of kW for vehicles and industries.

[0002]

2. Description of the Related Art FIG. 3 is a schematic sectional view of a magnet rotor for a permanent magnet type synchronous motor. The structure is such that a plurality of permanent magnets 15 are incorporated in the inner periphery of a ring-shaped magnetic yoke 14. is there. Magnet rotors for permanent magnet type large synchronous motors exceeding several tens of kW have very large rotors themselves, and there is no way to generate a magnetic field that can saturate magnets with large magnets incorporated. For this reason, usually, a method has been adopted in which a small magnet is attached after magnetizing, and the magnet is attached to a rotor as a single segment and rubbed with a jig.

[0003]

However, such a method not only requires a large-sized jig when bonding magnetized magnets, but also deteriorates the magnet dimensional accuracy during assembly. In addition, assembly often involves danger.

[0004]

Means for Solving the Problems In view of the above problems, the present inventors have made intensive studies and as a result completed the present invention. That is, the present invention relates to a magnetized yoke for a large synchronous motor rotor having a ring-shaped magnetic yoke and a plurality of permanent magnets incorporated in the inner periphery of the ring-shaped magnetic yoke. The gist of the present invention is a magnetized yoke in which a pulse magnetic field generating coil is arranged.

[0005]

Embodiments of the present invention will be described below with reference to the drawings. 1A and 1B are schematic partial cross-sectional views of an example of the magnetized yoke of the present invention. FIG.
(A) is a sectional view of the rotor circumferential surface, and (b) is a sectional view of the AA ′ plane of (a). The pulse magnetic field generating coil used in the present invention has an inner peripheral coil 1 on the inner periphery of the rotor.
However, an outer peripheral coil 2 is arranged on the outer periphery of the rotor. When the pulse magnetic field generating coil is hollow, the inner and outer peripheral coils are respectively disposed from the surfaces of the magnet 5 and the ring-shaped magnetic yoke 4 from the surface of the magnet 5 as shown in FIG. It is placed at a position of 5mm, and the widths C1 and C
2 is smaller than the inner and outer peripheral widths M1 and M2 of one pole of the magnet 5, respectively.
It is preferable to arrange them at a wide interval of up to 40 mm. Further, as shown in FIG. 1B, the length C3 of the inner and outer peripheral coils is desirably oriented 0 to 40 mm longer than the magnet length M3. When the diameter of the ring-shaped magnetic yoke 4 is 400 mm, for example, 6 to 12 pieces of the permanent magnet 5 (not magnetized) are preferably bonded. At this time, the magnet 5 may be incorporated and fixed by a known method, such as mechanical fixing by the spacer 6 between magnets.

FIG. 2 is a schematic partial sectional view of an example of the magnetized yoke of the present invention using the magnetic path forming yoke. FIG.
As shown in (1), the inner peripheral coil 1 and the outer peripheral coil 2 for generating a pulsed magnetic field can be wound around a magnetic path forming yoke 3 for surrounding the coil and returning a magnetic flux. The magnetic path forming yoke 3 is 10 to 3 times wider than the inner and outer peripheral width of one pole of the magnet 5.
It is preferable that the inner coil 1 and the outer coil 2 are arranged at a position 0 to 1 mm from the surfaces of the magnet 5 and the ring-shaped magnetic yoke 4 with a width of 0 mm wide. Further, it is desirable that the length of the yoke 3 for forming the magnetic path be oriented 0 to 40 mm longer than the length of the magnet. Further, a yoke 3 for forming a magnetic path.
The outer thickness Y1 of the inner circumference and the outer thickness Y2 of the outer circumference have a thickness of 30 to 1 which is not saturated so that the magnetic flux generated by the coil flows sufficiently.
It is 00mm. The flow of the magnetic flux at this time is in the direction of the arrow in FIG. The inner and outer peripheral coils for generating the pulse magnetic field and the yoke for forming the magnetic path are fixed by mechanical fixing using a resin mold or bolts to the reinforcing member so as to withstand the force applied to the coil by the magnetic field generated during magnetization. I just need.

[0007]

Next, an embodiment of the present invention will be described. Example 1 A ring-shaped magnetic yoke 4 having an inner diameter of 450 mm, an outer diameter of 490 mm, and a length of 250 mm was prepared. An Nd-based sintered type permanent magnet 5 was produced by a known method with dimensions of an outer diameter of 450 mm, an inner diameter of 440 mm, an outer width of 150 mm, and a length of 200 mm. These eight sheets were arranged inside the ring-shaped magnetic yoke 4, fixed by the inter-magnet spacers 6 and bonded, and assembled into a ring to produce a rotor.
The inner coil 1 and the outer coil 2 for generating a pulsed magnetic field are shown in FIG.
As shown in (a) and (b), the magnet 5 and the ring-shaped magnetic yoke 4 are located on the inner and outer circumferences of the rotor at positions 2 mm apart from the surface of the magnet 5 at intervals of 15 mm wider than the inner and outer circumference width of one pole of the magnet 5. Placed. Length of inner coil 1 and outer coil 2 is 2
It was 30 mm. A pulse current of 4 kA was applied to the pulse magnetic field generating hollow coil of the magnetized yoke to generate a magnetic field of 25 kOe and magnetize the magnet 5. The magnetized result was 97% compared to a magnet magnetized by applying a normal static magnetic field of 30 kOe.
９８98%.

Embodiment 2 As shown in FIG. 2, except that an inner coil 1 and an outer coil 2 for generating a pulse magnetic field are wound around a yoke 3 for forming a magnetic path.
A magnetized yoke was manufactured in the same manner as in Example 1. However, the magnetic path forming yoke 3 was made of a material SS400, having a length of 230 mm, an inner peripheral outer thickness Y1 of the magnetic path forming yoke of 40 mm, and an outer peripheral thickness Y2 of 50 mm. Also, the inner circumferential coil 1 and the outer circumferential coil 2 are positioned at 0.5 mm from the surfaces of the magnet 5 and the ring-shaped magnetic yoke 4, respectively, from the inner and outer circumferential width of one pole of the magnet 5.
The magnetic path forming yokes 3 were set so as to be arranged at a wide interval of 5 mm. The magnetized result was equivalent to 100% of the magnet magnetized by applying a normal static magnetic field of 30 kOe.

[0009]

According to the present invention, magnetization can be performed after an unmagnetized magnet is assembled in the rotor, so that a large-sized magnet rotor with high accuracy can be manufactured, and workability and safety can be improved. Can be greatly improved.

[Brief description of the drawings]

FIG. 1 is a schematic partial sectional view of an example of a magnetized yoke according to the present invention. (A) It is sectional drawing in a circumferential surface. (B) It is sectional drawing of the AA 'plane of (a).

FIG. 2 is a schematic partial sectional view of another example of the magnetized yoke of the present invention.

FIG. 3 is a schematic sectional view of a magnet rotor of a permanent magnet type large synchronous motor.

[Explanation of symbols]

 1 ‥‥ Inner coil for generating pulse magnetic field 2 ‥‥ Outer coil for generating pulse magnetic field 3 ‥‥ Yoke for forming magnetic path 4, 14 ‥ Magnetic yoke for ring 5, 15 ‥ Permanent magnet 6, 16 ‥ Spacer between magnets C11 ‥‥ Inner circumference coil width C2 ‥‥ Outer circumference coil width C3 ‥‥ Inner / outer circumference coil length M1 内 Inner circumference magnet width M2 ‥‥ Outer circumference magnet width M3 内 Inner circumference magnet length Y1 の For magnetic path forming yoke Outer thickness of inner circumference Y2 外側 Outer thickness of outer circumference of magnetic path forming yoke

Claims (3)

[Claims] 1. A magnetized yoke for a rotor for a large synchronous motor having a ring-shaped magnetic yoke and a plurality of permanent magnets built in the inner periphery of the ring-shaped magnetic yoke, on both sides of an outer periphery and an inner periphery of the rotor. A magnetized yoke comprising a coil for generating a pulsed magnetic field. 2. The magnetic field generating coil is hollow.
2. The magnetized yoke according to 1. 3. The magnetized yoke according to claim 1, wherein the magnetic field generating coil is wound around a magnetic path forming yoke.