JP2000299956A - Rotating electric machine - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a rotating electric machine having a breathing hole for preventing dew formation in a rotation detector room. A partition wall is provided which can prevent high-temperature and high-humidity air from flowing into a rotation detector 9 chamber in a motor body chamber,
Separate breathing holes in the motor body room and the rotation detector 9 room
15a and 15b are formed. The motor body room and the rotation detector room are separated by a partition having no hole penetrating on the front and back, and the motor body room and the rotation detector room each have independent breathing holes, and have a structure that can be opened to the atmosphere. Dew condensation does not occur in the rotation detector chamber, and malfunction of the rotation detector can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine having a rotation detector, and more particularly, to a motor body room and a rotation detector room which are partitioned by a partition having no holes penetrating the motor body room and the rotation detector room. The present invention relates to a rotating electric machine having a mechanism for opening each rotation detector chamber to the atmosphere.

[0002]

2. Description of the Related Art As a motor having a conventional rotation detector, a rotation detector is attached to an end on the side opposite to the drive shaft as described in Japanese Patent Application Laid-Open No. 2-111246, for example. There is a structure in which an air hole provided in the mounting boss acts as a fan when the rotating plate mounting boss rotates. That is, the mechanism of the fan of the air hole stirs the air in the rotation detector chamber to prevent the temperature of the rotation detector from rising.

[0003]

However, in a motor provided with a rotation detector having the above-described structure, a high temperature and a high humidity occur in the motor main body chamber immediately after the rotation of the motor from the state where the rotor is rotating. No mention is made of any means for preventing the air from entering the rotation detector chamber. Further, in the structure in which the rotation detector chamber is in a closed state, there is no mention of means for preventing water from entering from outside due to the temperature of the rotation detector chamber being lowered from a high temperature state and becoming negative pressure. In particular, in the case of a motor having a rotation detector that uses a rotation plate having a slit, the temperature difference between the rotation detector room and the atmosphere should be minimized to prevent dew / water droplets from adhering to the rotation plate and the rotation detector. is necessary.

In a motor requiring high-precision control, it is necessary to increase the number of pulses of a rotating plate used for a rotation detector. Further, in order to reduce the size of the rotation detector, the size of the rotating plate should be reduced. When a large number of pulses are provided on the reduced rotating plate, the slit width is reduced. Further, in order to improve the assemblability of the rotation detector, a connection portion of a signal line is required in the rotation detector room so that the rotation detector can be detachably attached. It is necessary to prevent the rotation detector from malfunctioning due to dew / water droplets adhering to the connection between the slit and the signal line, and it is required to prevent dew condensation inside the rotation detector room.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a rotary electric machine main chamber and a rotation detector chamber which are partitioned by a partition having no holes penetrating the rotary electric machine main chamber. Each of the rotation detector chambers has an independent breathing hole for opening to the atmosphere. With this configuration, it is possible to prevent the air that has become hot and humid in the rotary electric machine main chamber from flowing into the rotation detector chamber. Further, the temperature difference between the temperature inside the rotation detector chamber and the temperature of the atmosphere can be suppressed as much as possible, and intrusion of water from the outside can be prevented.

[0006] Preferably, the structure of the rotation detector that rotates together with the rotor has a structure having projections. With this configuration, the rotation of the rotor causes the protrusion to act as a fan, and the rotation detector chamber to be rotated. The air is released from the breathing hole to the atmosphere while stirring the air, and the temperature of the rotation detector chamber is set to the atmospheric temperature.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electric motor according to an embodiment of the present invention will be described with reference to FIGS.

First, the overall structure of the motor will be described with reference to FIG.

FIG. 1 is an upper half sectional view of an electric motor according to one embodiment of the present invention.

In this embodiment, a permanent magnet synchronous motor for an electric vehicle having a rotation detector will be described as an example. However, the present invention can be similarly applied to a motor having another rotation detector. Although the above-described electric motor is described for an electric vehicle, it can be applied to an electric motor used for other purposes.

At a substantially central portion of the shaft 1 in the axial direction, a cylindrical rotor 3 is fixed. The permanent magnet 2 is fixed inside the rotor 3. The inner ring side of the bearings 4a, 4b is attached to both ends of the shaft 1. The outer rings of the bearings 4a and 4b are held by a front end bracket 5 and a rear end bracket 6, respectively. Therefore, the rotor 3 and the shaft 1 are rotatably supported by the front end bracket 5 and the rear end bracket 6 by the bearings 4a and 4b. A breathing hole 15a is provided above the front end bracket 5 in a direction substantially horizontal to the shaft 1. The breathing hole 15a serves to open the motor body chamber to the atmosphere.

The front end bracket 5 and the rear end bracket 6 are respectively provided with a stator frame 7
Are fitted at both ends and are fastened by bolts. The stator frame 7 is provided with a shaping portion such as a mount boss for mounting the electric motor on a vehicle. The stator frame 7 has a substantially cylindrical shape, and a stator 8 is fixed to an inner surface of a substantially central portion of the stator frame 7.

Since the armature winding is applied to the stator 8 of the electric motor, the axial length of the stator 8 is longer than the axial length of the rotor 3 by the length of the coil end. The front end bracket 5 and the rear end bracket 6 move toward the space between the inner diameter of the coil end of the stator 8 and the shaft 1 caused by the difference between the shaft length of the stator 8 of the motor and the shaft length of the rotor 3. , Which are curved inward. The curved portion of the rear end bracket 6 serves as a partition separating the motor main body chamber and the rotation detector 9 chamber.

A rotation detector 9 is mounted in a curved space of the rear end bracket 6. The rotation detector 9 according to the present embodiment can detect both the magnetic pole position and the rotational displacement of the electric motor. The rotation detector 9 fixes a rotary plate 10 having a slit formed on the side opposite to the drive shaft of the shaft 1 with bolts 12 via a wheel cover 11, and emits light at a position located on the outer diameter side of the rotary plate 10.
It has a structure having a module 14 composed of a light receiving element.

The encoder cover 13 is fixed to the rear end bracket 6 by bolts. The encoder cover 13 is provided for waterproofing / dustproofing the rotation detector 9 and improving serviceability, and is detachable from the rear end bracket 6. A breathing hole 15b is provided above the encoder cover 13 in a direction substantially horizontal to the shaft 1. The breathing hole 15b serves to open the rotation detector 9 to the atmosphere. Breathing hole 15
By having b, the temperature difference between the temperature inside the rotation detector 9 and the atmospheric temperature can be minimized.

The armature winding of the stator 8 is generally provided with a varnish made of a resin material for fixing the armature winding. The varnish absorbs moisture in the motor body chamber, and the moisture absorbed evaporates due to a rise in temperature due to energization of the armature windings, so that the motor body chamber becomes hot and humid. If the motor main body chamber and the rotation detector 9 chamber are connected by a through hole, the air that has become hot and humid in the motor main body chamber flows into the rotation detector 9. When the state is rapidly cooled from that state, dew condensation occurs in the rotation detector 9 due to a temperature difference between the rotation detector 9 and the atmosphere.

It is needless to say that the number of the breathing holes 15a and 15b does not need to be one in each of the motor main body room and the rotation detector 9 room as shown in the figure, but may be plural.

Next, the structure of the breathing tube 16 provided in the electric motor will be described with reference to FIG.

FIG. 2 is a partially enlarged sectional view of a breathing tube 16 provided in the rotation detector 9 of the electric motor according to one embodiment of the present invention.

As shown in FIG. 2, the encoder cover 13
A breathing tube 16 is formed integrally with a breathing hole 15b provided in a direction substantially horizontal to the shaft 1 at the top. Respiratory tract 1
A breather tube 17 is connected to 6 and crawls above a vehicle (not shown) to be opened to the atmosphere. By opening to the atmosphere above the vehicle as described above, it is possible to prevent water from entering the rotation detector 9 from outside. In the above structure, the breathing hole 15a provided in the electric motor body (not shown) is also integrally formed with a breathing tube, a breather tube is connected to the breathing tube, and the breathing tube is crawled up to a vehicle (not shown) to be opened to the atmosphere. Opening to the atmosphere above the vehicle as described above can prevent water from entering the motor body from outside.

Next, the shape of the wheel cover 11 used in the electric motor will be described with reference to FIG.

FIG. 3 is a perspective view of the wheel cover 11 used in the electric motor according to one embodiment of the present invention.

Although the number of the protrusions 11a according to the present embodiment is four, the number and shape of the protrusions 11a are not particularly limited.

A wheel cover 11 for fixing the rotary plate 10 to the shaft 1 rotates with the rotation of the shaft 1, and has a through hole 11 through which a bolt 12 is inserted at the center.
b is formed, and a projection 11a is integrally formed on a surface that is not in contact with the rotating plate 10. The rotation of the projection 11a acts as a fan, and serves to stir the air in the rotation detector 9 chamber. Due to the fan action of the protrusion 11a, the rotation detector 9
The temperature rise in the room can be minimized.

[0025]

According to the present invention, the motor main body chamber and the rotation detector chamber are partitioned by a partition wall having no hole penetrating from front to back.
By providing a structure in which each of the motor main body chamber and the rotation detector chamber has independent breathing holes and can be opened to the atmosphere, a structure in which dew condensation does not occur in the rotation detector chamber can be achieved.

[Brief description of the drawings]

FIG. 1 is an upper half sectional view of an electric motor according to an embodiment of the present invention.

FIG. 2 is a partially enlarged cross-sectional view of a breathing tube mounting portion provided in a rotation detector chamber of the electric motor according to the embodiment of the present invention.

FIG. 3 is a perspective view of a wheel cover used for the electric motor according to the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... shaft, 2 ... permanent magnet, 3 ... rotor, 4a, 4b
... Bearing, 5 ... Front end bracket, 6 ...
Rear end bracket, 7 ... Stator frame, 8 ...
Stator, 9 ... rotation detector, 10 ... rotating plate, 11 ... wheel cover, 11a ... projection, 11b ... through hole, 12 ... bolt, 13 ... encoder cover, 14 ... module, 1
5a, 15b: breathing hole, 16: breathing tube, 17: breather tube.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) H02K 29/14 H02K 11/00 BCF term (Reference) 5H019 AA00 BB03 BB08 BB12 BB27 CC03 CC09 DD01 FF00 FF01 5H605 AA02 BB05 CC02 DD07 DD16 5H609 BB03 PP02 PP16 QQ02 QQ08 RR06 RR07 5H611 AA01 BB08 PP05 QQ01 QQ03 RR05 TT01 UA01 5H621 HH01 JK07 JK11 JK13 JK14

Claims (4)

[Claims] In a rotating electric machine having a rotation detector for detecting rotation of a rotor, the rotating electric machine main chamber and the rotation detector chamber are separated by a partition wall having no holes penetrating on the front and back, and the rotating electric machine main chamber and A rotating electric machine, wherein an independent breathing hole for opening to the atmosphere is provided in each of the rotation detector chambers. 2. The rotating electric machine according to claim 1, further comprising a breathing tube formed integrally with said breathing hole. 3. A rotating electric machine according to claim 1, wherein said rotating electric machine comprises a permanent magnet type rotor and a rotation detector for detecting a magnetic pole position and a rotation speed of said rotor. 4. The rotating electric machine according to claim 1, wherein a protrusion is integrally formed with a structure on which the rotation detector rotates.