JPH0421331A - Motor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electric motor in which a plurality of ring-shaped permanent magnets are arranged on a shaft to form a skew.

[Prior Art] In electric motors that employ permanent magnets in the rotor, it is difficult to form a skew on the stator side, where the windings are provided, so the skew is formed on the rotor side.

However, it is not easy to create a skew in a rotor made of permanent magnets. Conventionally, multiple ring-shaped permanent magnets were arranged around the shaft, and each permanent magnet was slightly rotated to create a comprehensive skew. It was configured to be formed.

[Problems to be solved by the invention] However, according to the conventional method, there is a problem in that if the permanent magnet is not firmly attached to the shaft, it will move in the direction of rotation when vibration or torque is generated. Ta.

Therefore, even if the adhesive force of some of the permanent magnets among the plurality of permanent magnets is not weakened, the coupling with the shaft is lost regardless of the adjacent permanent magnet due to the torque generated in the permanent magnet.

In addition, because the permanent magnet cannot be press-fitted into the shaft due to the material that makes up the permanent magnet, we hoped to improve the adhesion effect by forming splines on the shaft to ensure reliable adhesion to the shaft. .

However, since the torque generated in the permanent magnet is on the outer circumferential side of the permanent magnet, and the connection with the shaft is on the inner diameter side, a fixing strength several times the torque generated on the permanent magnet is required.

Moreover, the electric motor must have sufficient coupling between the shaft and the permanent magnets under the vibrations that may occur in practice.
In practice, strong fixation was required.

Furthermore, when a plurality of magnetized permanent magnets are arranged side by side, an attractive force acts in the direction of rotation, making assembly difficult.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an electric motor in which a plurality of permanent magnets installed side by side can maintain connection with a shaft and can be easily assembled.

[Means for solving the problem] The present invention forms unevenness on the side surface of a ring-shaped permanent magnet,
The problem is solved by fitting these irregularities with adjacent permanent magnets.

[Function] Even if torque is generated in each of the multiple permanent magnets installed together, the adjacent permanent magnets are connected by the unevenness, so the adjacent permanent magnets become one, and the permanent magnets are connected to the shaft. No local force is applied, the connection with the shaft is uniform throughout, and the connection between the permanent magnet and the shaft is reliably maintained.

[Embodiment] The present invention will be explained based on an embodiment shown in the drawings. Fig. 1 is a side view of a main part of an electric motor showing an embodiment of the invention, and Fig. 2 shows the following: It is a side view seen from an axial direction.

In FIG. 1, the electric motor includes a plurality of permanent magnets 1.2.3
．． A plurality of permanent magnets 1, 2, 3, 4 are arranged side by side in the axial direction, and each permanent magnet 1, 2, 3, 4 is formed in a ring shape, and unevenness 5 is uniformly formed on the side part.

The unevenness 5 may have any shape as long as it fits in the axial direction.

Further, a slight gap may be formed in the fitting portion of the unevenness 5, and in that case, the small gap can be used to fill the adhesive.

Each of the permanent magnets 1.2.3.4 is magnetized NS in a negative manner, and the adjacent permanent magnets 1.2.3.4 are magnetized in a NS manner.
3.4, the recesses and recesses 5 are fitted one by one in a state shifted in the direction of rotation.

Furthermore, as shown in FIG. 2, permanent magnets 1.2.3.
A shaft 7 is passed through the inner diameter side of the shaft 4 via a yoke 6, and the shafts 7 and 4 are bonded together so that they can rotate together with the shaft 7.

The shaft 7 and the yoke 6 are connected by press-fitting, and the yoke 6 and the permanent magnet 1.2.3.4 are connected to each other by injecting adhesive into /118 formed in the axial direction on the outer circumference of the yoke 6. Fixed.

In such a configuration, the electric motor is constructed by press-fitting the yoke 6 onto the shaft 7, fitting the permanent magnets 1, 2, 3, 4 around the outer periphery of the yoke 6, and injecting adhesive from the groove 8 and solidifying it.

A conventional fixing method using such an adhesive may be used.

When the adhesive hardens and the permanent magnets 1, 2, 3, 4 are bonded to the yoke 6, the permanent magnets 1, 2, 3, 4 become integrated with the shaft 7. Although not shown in the drawings, the electric motor is equipped with a rotor inside the stator as a conventional electric motor. Complete.

The electric motor completed in this way uses permanent magnets 1.2.3.4.
is shifted in the rotational direction for each unevenness, so a skew is substantially formed.

These permanent magnets 1.2.3.4 are individually glued and fixed to the yoke 6, but even if a force in the rotational direction is applied to each permanent magnet 1.2.3.4, The force that the permanent magnet 1.2.3.4 receives is the force that the adjacent permanent magnet 1.
．． 2.3.4 by the unevenness 5, they are distributed in a --like manner.

In this way, the force generated locally on the permanent magnet 1.2.3.4 is dispersed among the plurality of permanent magnets 1.2.3.4 by the unevenness 5, and can be sufficiently withstood even if the adhesive strength is weak. Become.

[Effects of the Invention] According to the present invention, it is possible to solve the problem that the permanent magnet is fixed to the shaft via the yoke or the bond is locally broken, and a special bonding method is adopted. This is not necessary and the effect of making it easy to manufacture a TO machine is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a side view of essential parts of an electric motor showing an embodiment of the present invention, and FIG. 2 is a side view of the motor as viewed from the axial direction. 1. 2. 3, 4...Permanent magnet, 5...Irregularities, -Yoke, 7...Shaft, 8...Groove.

Claims (1)

[Claims] In an electric motor in which a plurality of ring-shaped permanent magnets are arranged on a shaft to form a skew, an unevenness is formed on the side surface of the ring-shaped permanent magnet, and the unevenness is fitted between adjacent permanent magnets. An electric motor featuring: