JPS6253156A - Motor - Google Patents

Abstract

PURPOSE:To mount or replace a temperature sensor easily by forming a housing section, such as a hole, a groove, etc., into which the temperature sensor, such as a temperature relay, a temperature fuse, etc. is inserted, to a stator core. CONSTITUTION:A hole 7 is shaped at a position having required intervals from teeth sections 2 as a housing section, into which a temperature relay 6 is inserted and housed, in a yoke section 3 for a stator core 1. Windings 5 are wound on the teeth sections 2 for the stator core 1 through spools 4 consisting of an insulating material, and the temperature relay 6 is connected in series with the windings 5. The temperature relay 6 interrupts currents flowing through the windings 5 connected in series by the opening of a contact for the relay 6.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to electric motors, and in particular, the present invention relates to electric motors, and in particular to temperature relays and temperature fuses that cut off current flowing through the windings when the temperature of the windings rises. The present invention relates to an electric motor equipped with an f-sensing device.

[Conventional technology and its problems] When the temperature of the stator windings increases due to long-term use or overload of the motor, it is necessary to reduce the temperature of the windings by cutting off the current flowing through the windings. be. For this reason, conventionally, as shown in FIG. 4, a temperature relay 6 is connected to the winding 5 so as to cut off the current flowing through the winding 5 when the temperature of the winding 5 rises. 6 was tied to the coil end of the winding 5 with a string 9 or the like.

However, in this case, since the temperature relay is tied to the coil end of the stator winding, the entire stator becomes longer in the axial direction, and the entire motor also becomes longer in the axial direction.

Further, it takes time and effort to tie the temperature relay to the coil end with a string or the like, and it is very troublesome to replace the temperature relay if it is defective or breaks down. Particularly when the windings are directly wound around the stator core, there is also the drawback that it takes a lot of effort to tie the temperature relay to the windings.

Therefore, it is an object of the present invention to prevent the overall size from increasing even though a temperature sensing device such as a temperature relay or a temperature fuse is installed, and to save time and effort in installing and replacing the temperature sensing device. The purpose is to provide an electric fIJ machine that does not require electricity.

1 Means for Solving Problem 1 In order to solve the above problem, the electric motor of the present invention is constructed as follows.In other words, the electric motor of the present invention is configured as follows. The stator core has holes, grooves, and other accommodating portions into which temperature sensing devices such as temperature relays and temperature fuses can be inserted.

1 Effect 1 In the electric motor of the present invention, when attaching a temperature relay to the stator, the temperature sensing device such as the temperature relay or temperature fuse is simply inserted into the housing part such as a hole or groove provided in the stator core. Then, the temperature sensing device is positioned and held fixed.

Even if the temperature of the stator windings is sensed indirectly through the stator core, the core itself has relatively good thermal conductivity, so it is as accurate as sensing the humidity of the windings directly. can be measured.

Also, a hole provided in the stator for inserting a temperature sensing device,
Since the receiving portion such as the groove is provided at a location that does not affect the magnetic flux that effectively acts on the rotor, it does not affect the operation of the electric motor.

[Example 1 Hereinafter, the present invention will be explained in detail based on the drawings.

In FIG. 1, reference numeral 1 denotes a stator core of an electric motor, which is integrally formed with a plurality of circularly arranged teeth 2 and a yoke 3 that connects them. A winding 5 is wound around the teeth 2 of the stator core 1 via a spool 4 made of an insulating material, and a temperature relay 6 is connected in series to the winding 5. There is. This temperature relay 6 is
It senses the temperature, opens the contacts when the temperature rises above a predetermined temperature, and closes the contacts again when the temperature drops.

That is, by opening the contacts, the current flowing through the series-connected windings 5 is interrupted.

Further, in the yoke portion 3 of the stator core 1, a hole 7 is provided at a position spaced apart from the tooth portion 2 by a required distance as a housing portion into which the temperature relay 6 is inserted and accommodated. This hole 7 is formed in such a size that the side surface of the temperature relay 6 comes into contact with the inner surface of the hole 7 so that the temperature of the stator core 1 can be directly sensed.

By inserting the σ relay 6 into the hole 7, the temperature of the winding 5 is sensed via the stator core 1. Since the stator core 1 is made of a magnetic material with good thermal conductivity, the difference between sensing the temperature of the winding 5 directly and sensing it through the stator core 1 is not much of a problem. Also, even if there is a certain degree of difference, consider the difference!
The type of temperature relay 6 can be selected using the following steps.

The hole 7 may be a 51 through hole as shown in FIGS. 1 and 2, but if it is a hole with a bottom, the temperature relay 6 can be positioned therein. In addition, if the size of this box 7 is made to be smaller than the size of the temperature relay 6, the temperature relay 6 is inserted into the hole 7 so that its temperature sensing part is in contact with the inner surface of the hole 7, and the temperature relay 6 is inserted into the gap. Insert and fix a spacer made of synthetic resin or the like.

FIG. 3 shows another embodiment, in which only the stator A1 is shown. In this embodiment, a groove 8 into which a temperature relay 6 can be fitted is formed in the yoke part 3 between the fJjJ part 2 and the tooth part 2 of the stator core 1 as a housing part. In this case as well, the temperature relay 6 can be easily fixed by fitting a spacer with comparative internal strength between the side surface of the groove 8 and the temperature relay 6.

The hole 7 or groove 8 into which the temperature relay 6 is inserted is formed at a position that does not affect the magnetic flux acting on the rotor, depending on the shape of the stator core 1.

In this way, the temperature relay 6 can be easily installed and replaced by simply inserting the temperature relay 6 into the hole 7 or groove 8.

In the above embodiment, the temperature relay 6 is used as the temperature sensing device, but the same applies to the case where a temperature fuse or other temperature sensing device is used.

[Advantageous Effects of the Invention 1] As described above, in the core motor of the present invention, the stator core is provided with an accommodating portion such as a hole or a groove into which a temperature sensing device such as a temperature relay or a temperature sensor is inserted. By simply inserting the temperature sensing device into this hole or groove, the temperature sensing device is positioned and held fixed, so there is no need to tie it down with strings, etc., making it easy to install and replace the temperature sensing device. Also, even if a temperature sensing device is installed, the electric vJ
The overall dimensions will not increase.

Furthermore, since the temperature sensing device is installed inside the stator core, it is not directly affected by cooling fans, etc.
Since the temperature of the winding is sensed through a core made of a material with relatively good thermal conductivity, the accurate temperature of the winding is sensed.

[Brief explanation of drawings]

Fig. 1 is a front view showing a stator in a heart motor according to an embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 is a stator core of another embodiment. The front view shown and FIG. 4 are cross-sectional views showing the stator of a conventional electric motor. Explanation of symbols 1...Stator core 2...Tooth portion 3...Yoke portion 4... Spool 5... Winding 6... Temperature relay 7... Hole
8...Mizo Patent Applicant Shibaura Seisakusho Co., Ltd. Representative Patent Attorney Tsuta 1) Shoko
j”. 1 other person 1

Claims (1)

[Claims] 1. An electric motor characterized in that a housing part such as a hole or groove for inserting a temperature sensing device such as a temperature relay or a temperature fuse is provided in a part of the stator core that does not affect the magnetic flux acting on the rotor.