阅读说明：本技术 旋转电机及使用该旋转电机的门装置 (Rotating motor and door device using same ) 是由 小松孝教 山本幸弘 于 2017-07-14 设计创作，主要内容包括：在旋转电机中,旋转角度检测装置具有磁产生体和与磁产生体对置的磁传感器。在旋转轴的轴向的端面设置有圆形的凹部。磁产生体设置在凹部内。磁产生体在旋转轴的轴向上被磁化。在磁产生体的与磁传感器对置的面形成有多个磁极。在磁产生体的侧面设置有沿着凹部的内周面的圆弧面。磁产生体具有用于进行磁产生体在旋转轴的周向上的定位的定位部。(In a rotating electrical machine, a rotation angle detection device includes a magnetism generating body and a magnetic sensor facing the magnetism generating body. A circular recess is provided on an axial end surface of the rotary shaft. The magnetism generating body is disposed in the recess. The magnetic generator is magnetized in the axial direction of the rotating shaft. A plurality of magnetic poles are formed on a surface of the magnetic generator facing the magnetic sensor. An arc surface is provided on a side surface of the magnetic generator along an inner peripheral surface of the recess. The magnetism generating body has a positioning portion for positioning the magnetism generating body in the circumferential direction of the rotating shaft.)

1. A rotating electrical machine is provided with:

a housing;

a stator provided to the housing;

a rotating shaft rotatably provided in the housing;

a rotor provided on the rotating shaft; and

a rotation angle detection device comprising: a magnetic generator provided at an axial end of the rotating shaft; and a magnetic sensor facing the magnetism generating body, the rotation angle detecting device generating a signal corresponding to a rotation angle of the rotating shaft,

a recess is provided on an axial end surface of the rotary shaft,

the magnetism generating body is disposed in the recess,

the periphery of the recess of the rotating shaft is made of a magnetic material,

the magnetic generator is magnetized in an axial direction of the rotating shaft,

a plurality of magnetic poles are formed on a surface of the magnetic generator facing the magnetic sensor,

the front surface of the concave part is in a circular shape,

an arc surface along the inner peripheral surface of the concave portion is provided on the side surface of the magnetic generator,

the magnetism generating body has a positioning portion for positioning the magnetism generating body in a circumferential direction of the rotating shaft.

2. The rotating electric machine according to claim 1,

the positioning portion is a flat surface portion that is provided on a side surface of the magnetic generator and linearly connects circumferential end portions of the arc surface.

3. The rotating electric machine according to claim 1,

the positioning portion is a notch portion provided on a side surface of the magnetic generator.

4. The rotary electric machine according to any one of claims 1 to 3,

the entire magnetism generating body is housed in the recess.

5. The rotating electric machine according to any one of claims 1 to 4,

the rotating electric machine further includes a bearing provided between the housing and the rotating shaft,

the recess and the magnetism generating body are disposed inside the bearing.

6. The rotating electric machine according to any one of claims 1 to 5,

the housing is provided with a cover made of a magnetic material, which is larger than the diameter of the rotating shaft and covers the magnetic generator and the magnetic sensor.

7. A door device is provided with:

a door panel that opens and closes the entrance;

a cross member disposed above the door panel; and

the rotating electrical machine according to any one of claims 1 to 6, which is provided to the cross member, and is a door motor that moves the door panel.

8. The door apparatus according to claim 7, wherein,

an end portion of the door motor on a side where the rotation angle detecting device is disposed is opposed to the cross member,

the cross member is formed of a magnetic material at a portion thereof facing the door motor.

Technical Field

The present invention relates to a rotating motor having a rotation angle detection device for detecting a rotation angle of a rotating shaft, and a door device for moving a door panel by the rotating motor.

Background

In a conventional rotation angle detecting device, a holder is fitted into an end portion of a rotating shaft. A disc-shaped permanent magnet is provided in the holder (see, for example, patent document 1).

In another conventional rotation angle detecting device, a permanent magnet is fixed to an end surface of a rotating shaft. The permanent magnet has a rectangular parallelepiped shape (see, for example, patent document 2).

In the conventional rotation angle sensor, a magnet is fixed to an end portion of the rotating shaft via a fixing aid. The magnet is formed by overlapping the annular portion and the plate-like portion. The annular part is fixed on the auxiliary tool for fixing. The plate-like portion faces the magnetic sensor. Further, a plate-like portion having an oblong planar shape has been proposed (for example, see patent document 3).

Further, in the conventional motor, a magnet is partially embedded in an end surface of a rotating shaft (see, for example, patent document 4).

In addition, in the conventional volumetric flowmeter, a signal transmission magnet is embedded in an end surface of the rotor shaft. The signal transmitting magnet is magnetized in a direction orthogonal to the rotor axis. The rotating magnetic flux of the signal transmitting magnet is detected by a magnetic sensor facing the signal transmitting magnet (see, for example, patent document 5).

Disclosure of Invention

Problems to be solved by the invention

In the conventional devices disclosed in patent documents 1 to 3, the entire magnet protrudes from the end surface of the rotating shaft, and the axial dimension of the entire device increases, which hinders miniaturization. In patent documents 1 to 3, since the magnet is magnetized in the radial direction of the rotating shaft, the magnetic field generated when the magnet is embedded in the end portion of the rotating shaft is reduced.

In addition, when the magnet of patent document 2 is embedded in the end portion of the rotating shaft, it is difficult to process the magnet by providing a rectangular recess portion in the end surface of the rotating shaft, and it is difficult to position the magnet in the circumferential direction of the rotating shaft by providing a circular recess portion. Further, in patent document 3, since the diameter of the magnet is larger than the diameter of the rotating shaft, it is difficult to fit the magnet into the rotating shaft.

Further, since the magnet of patent document 4 is also magnetized in the radial direction of the rotation axis, the magnetic field generated is reduced when the amount of the magnet embedded in the rotation axis is increased. In the volumetric flowmeter disclosed in patent document 5, the magnetic sensor is located at a position offset from the axial center of the rotor shaft, and detects the rotation speed instead of the rotation angle of the rotor shaft, so that it is not necessary to adjust the angle of the signal transmission magnet in the recess.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rotating electrical machine and a door device using the rotating electrical machine, which can reduce the axial dimension and facilitate the positioning of a magnetism generating body in the circumferential direction of a rotating shaft.

Means for solving the problems

A rotating electric machine according to the present invention includes: a housing; a stator provided to the housing; a rotating shaft rotatably provided in the housing; a rotor provided on the rotating shaft; and a rotation angle detection device having: a magnetic generator provided at an axial end of the rotating shaft; and a magnetic sensor facing the magnetic generator, wherein the rotation angle detection device generates a signal corresponding to a rotation angle of the rotating shaft, a recess is provided on an end surface in an axial direction of the rotating shaft, the magnetic generator is provided in the recess, a periphery of the recess of the rotating shaft is formed of a magnetic material, the magnetic generator is magnetized in the axial direction of the rotating shaft, a plurality of magnetic poles are formed on a surface of the magnetic generator facing the magnetic sensor, a front surface of the recess is circular, an arc surface along an inner circumferential surface of the recess is provided on a side surface of the magnetic generator, and the magnetic generator has a positioning portion for positioning the magnetic generator in the circumferential direction of the rotating shaft.

Effects of the invention

The rotating electric machine of the present invention is provided with a recess on an end surface of a rotating shaft, a magnetic generator disposed in the recess, a magnetic body formed around the recess of the rotating shaft, the magnetic generator being magnetized in an axial direction of the rotating shaft, a plurality of magnetic poles being formed on a surface of the magnetic generator facing a magnetic sensor, the recess having a circular front shape, an arcuate surface being provided on a side surface of the magnetic generator along an inner circumferential surface of the recess, the magnetic generator having a positioning portion for positioning the magnetic generator in a circumferential direction of the rotating shaft, and therefore, the axial dimension can be reduced, and positioning of the magnetic generator in the circumferential direction of the rotating shaft is facilitated.

Drawings

Fig. 1 is a sectional view of a rotating electric machine according to embodiment 1 of the present invention.

Fig. 2 is a rear view showing a part of the rotating electric machine of fig. 1.

Fig. 3 is a front view showing an end surface of the rotating shaft of fig. 1.

Fig. 4 is a front view showing a 1 st modification of the magnetic generator of fig. 3.

Fig. 5 is a front view showing a 2 nd modification of the magnetic generator of fig. 3.

Fig. 6 is an explanatory diagram showing magnetic fields generated by the magnetic generator of fig. 1.

Fig. 7 is a front view showing a part of an elevator car as an application example of the rotating electric machine of the present invention.

Fig. 8 is a side view showing a portion of the car of fig. 7.

Detailed Description

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.