JPH0739257U - Permanent magnet rotor - Google Patents

Abstract

(57) [Summary] [Structure] In a permanent magnet rotor having a plurality of permanent magnets in the outer peripheral direction of a rotating shaft, a plurality of permanent magnets are provided on the outer periphery of the rotating shaft with a gap around the outer periphery of the rotating shaft. A semi-cured plate-like material in which a glass fiber or polymer fiber base material is impregnated with an epoxy resin is provided in the void. [Effect] Since a plate-like material containing an epoxy resin is interposed in the gap between the adjacent permanent magnets in which a plurality of permanent magnets are arranged on the outer circumference of the rotating shaft to bond and fix the permanent magnets to each other, the adhesive strength is the same as that of the conventional permanent magnets. Greatly improved compared to the rotor. Therefore, it is possible to obtain an excellent permanent magnet rotor in which separation of the permanent magnet does not occur even during high-speed rotation at high temperature during operation.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a permanent magnet rotor having permanent magnets arranged on the outer circumference of a rotary shaft.

[0002]

[Prior art]

 A conventional permanent magnet rotor, in which a plurality of permanent magnets are arranged on the outer circumference of a rotary shaft, is provided with a yoke 2 formed by laminating iron plates having protrusions 3 on the outer circumference of the rotary shaft 1 as shown in FIG. Adhesive 4 is applied to the inner surface of the permanent magnet 5 to adhere to it, and a semi-cured tape or sheet material obtained by impregnating glass cloth with epoxy resin is wound around the outermost circumference of the permanent magnet 2 to 3 times. After that, these were heated to a predetermined temperature to cure the adhesive 4 and the semi-cured tape or sheet material 6 to fix the permanent magnet to the rotary shaft.

[0003]

[Problems to be solved by the device]

 However, in the conventional case, the inner peripheral surface of the permanent magnet is fixed to the outer periphery of the yoke of the rotary shaft with an adhesive, and the adhesive force of the adhesive is reduced due to heat generated from the winding wire during operation. For this reason, centrifugal force is applied to the permanent magnets during high-speed rotation, causing the permanent magnets to separate from the yoke. The purpose of this plan is to firmly fix the permanent magnet without peeling off from the yoke of the rotating shaft even when rotating at high speed.

[0004]

[Means for Solving the Problems]

 The present invention relates to a permanent magnet rotor having a plurality of permanent magnets on the outer circumference of a rotating shaft, in which a plurality of permanent magnets are arranged on the outer circumference of the rotating shaft with gaps in the axial direction, and glass fibers or high A semi-cured plate-like material in which an epoxy resin is impregnated on a base material of molecular fibers is provided.

[0005]

[Action]

 Therefore, the permanent magnets attached to the outer periphery of the rotary shaft are sheets based on glass fiber or polyester fiber sandwiched between the outer peripheral surface of the rotary shaft, the inner peripheral surface of the permanent magnet and adjacent permanent magnets. The material is adhesively fixed by a semi-hardened plate-like material impregnated with epoxy resin.

[0006]

【Example】

 The present invention will be described with reference to the embodiment shown in FIG. FIG. 1 is a sectional view showing an embodiment of the present invention. The same parts as those in FIG. 2 are designated by the same reference numerals and detailed description thereof will be omitted. The permanent magnet rotor is provided with a yoke 2 formed by stacking iron plates having protrusions 3 on the outer circumference of the rotary shaft 1, and the inner peripheral surface of the permanent magnet 4 is fixed to the outer peripheral surface of the yoke between the protrusions 3 and 3 with an adhesive. There is. In the adjacent gaps of the permanent magnets 4, a glass cloth having a thickness equal to the gap is impregnated with an epoxy resin containing a bisphenol A type epoxy resin and an acid anhydride curing agent, and heated at a predetermined temperature and time in advance. A plate-like material 7 in a semi-cured state is sandwiched between the permanent magnets 4 and the permanent magnet 4 has a thickness of 0. A sheet material 6 in a semi-cured state in which a 13 mm glass cloth was impregnated with an epoxy resin was wound twice and a half, and then heated and cured at a predetermined temperature and a predetermined time. In the embodiment of FIG. 1, the yoke is attached to the outer circumference of the rotary shaft to fix the permanent magnet, but the permanent magnet may be directly fixed to the outer circumference of the rotary shaft.

[0007]

[Effect of device]

 As described above, according to the present invention, the permanent magnets are bonded and fixed to each other by interposing the plate-shaped material containing the epoxy resin in the gap between the adjacent permanent magnets in which a plurality of permanent magnets are arranged on the outer circumference of the rotating shaft, so that the adhesive strength is improved. Is significantly improved over the conventional permanent magnet rotor. Therefore, it is possible to obtain an excellent permanent magnet rotor that does not cause separation of the permanent magnet even during high-speed rotation at high temperature during operation.

[Brief description of drawings]

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

FIG. 2 is a sectional view of a permanent magnet rotor showing a conventional example.

[Explanation of symbols]

 1 rotating shaft 2 yoke 3 protrusion 4 adhesive 5 permanent magnet 6 tape 7 plate

Claims (1)

[Scope of utility model registration request] 1. A permanent magnet rotor having a plurality of permanent magnets on the outer circumference of a rotary shaft, wherein a plurality of permanent magnets are arranged on the outer circumference of the rotary shaft with a gap in the axial direction, and a glass fiber between the gaps. Alternatively, a permanent magnet rotor is provided with a semi-cured plate-like material obtained by impregnating an epoxy resin on a base material of polymer fiber.