CN203367993U

CN203367993U - Motor temperature protection device

Info

Publication number: CN203367993U
Application number: CN 201320419611
Authority: CN
Inventors: 谯兴宇
Original assignee: Dazhou Electric Power Bureau Of Sichuan Electric Power Co; State Grid Corp of China SGCC
Current assignee: Dazhou Electric Power Bureau Of Sichuan Electric Power Co; State Grid Corp of China SGCC
Priority date: 2013-07-15
Filing date: 2013-07-15
Publication date: 2013-12-25
Anticipated expiration: 2023-07-15

Abstract

The utility model specifically relates to a motor temperature protection device. A fuse 1RD, a start button SA, a stop button SB, a relay KM, normally-closed temperature control switch KSD1, a normally-closed temperature control switch KSD2, a normally-closed temperature control switch KSD3 and a fuse 2RD are serially connected successively between the U phase and the W phase of a three-phase power source, wherein the stop button SA is connected in parallel with a normally open contact KM2 of the relay KM; the normally-closed temperature control switch KSD1 is installed on the U-phase stator coil of a three-phase motor, the normally-closed temperature control switch KSD2 is installed on the V-phase stator coil of the three-phase motor, the normally-closed temperature control switch KSD3 is installed on the W-phase stator coil of the three-phase motor; and a normally open contact KM1 of the relay KM is arranged on the power line of the three-phase motor and serially connected with a plastic switch ZK. The motor temperature protection device of the utility model can be used to perform comprehensive and high-sensitivity real-time monitoring on the temperature of each stator coil of the three-phase motor, and when the temperature of any stator coil reaches a preset temperature, the power source will be controlled so as to stop supplying power to the three-phase motor to protect the three-phase motor.

Description

A kind of motor temperature protector

Technical field

The utility model relates to a kind of electric motor protective device, is specifically related to a kind of motor temperature protector.

Background technology

While continuing operation in the situations such as overload, phase shortage, blocking when motor, the insulation of coil of stator of motor is easy to damage, thereby various temperature protective devices occurred.

Now the temperature protective device of motor is various on the market, and pluses and minuses are respectively arranged, and roughly is divided into: 1, and insufficient sensitivity, the protection temperature is non-constant, and perhaps temperature does not still play a protective role higher than safety line yet; 2, apparatus structure complexity, high cost.And, along with aluminium core motor is universal cheaply, because copper core is larger than the ampacity of the aluminum core line of same model, under identical service condition, the stator coil of aluminium core motor more capacity damages.

The utility model content

The purpose of this utility model is to provide a kind of motor temperature protector, has solved the temperature protective device insufficient sensitivity of current three phase electric machine, and the problem of structure too complex high cost.

For solving above-mentioned technical problem, the utility model by the following technical solutions: a kind of motor temperature protector comprises:

Be serially connected with successively fuse 1RD, start button SA, stop button SB, relay K M, normally closed temperature detect switch (TDS) KSD1, normally closed temperature detect switch (TDS) KSD2, normally closed temperature detect switch (TDS) KSD3 and fuse 2RD between the U of three phase mains phase and W phase, wherein said start button SA is parallel with the normally opened contact KM2 of relay K M;

Described normally closed temperature detect switch (TDS) KSD1 is arranged on the U phase stator coil of three phase electric machine, and described normally closed temperature detect switch (TDS) KSD2 is arranged on the V phase stator coil of three phase electric machine, and described normally closed temperature detect switch (TDS) KSD3 is arranged on three phase electric machine W phase stator coil;

Have the normally opened contact KM1 of relay K M to be arranged on the power line of three phase electric machine, with plastic switch, ZK is connected in series.

Further technical scheme is, the normally opened contact KM3 serial connection be provided with between the U phase of described three phase mains and W phase by relay K M starts the startup prompting branch road that warning light HD forms; The U phase of three phase mains and W are provided with that normally-closed contact KM4 serial connection by relay K M stops that warning light LD forms between mutually stops pointing out branch road.

Compared with prior art; the beneficial effects of the utility model are: can comprehensive, highly sensitive each stator coil temperature to three phase electric machine monitor in real time; when any one stator coil reaches predetermined temperature; can control power supply stops, to the three phase electric machine power supply, playing the effect of protection three phase electric machine.

The accompanying drawing explanation

Fig. 1 is circuit connection diagram of the present utility model.

Fig. 2 is the installation site schematic diagram of temperature detect switch (TDS) of the present utility model in three phase electric machine.

Fig. 3 is motor circuit connection layout of the present utility model.

Embodiment

In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the utility model, and be not used in restriction the utility model.

Fig. 1, Fig. 2 and Fig. 3 show an embodiment of a kind of motor temperature protector of the utility model: a kind of motor temperature protector comprises:

As shown in Figure 1, be serially connected with successively fuse 1RD, start button SA, stop button SB, relay K M, normally closed temperature detect switch (TDS) KSD1, normally closed temperature detect switch (TDS) KSD2, normally closed temperature detect switch (TDS) KSD3 and fuse 2RD between the U of three phase mains phase and W phase, wherein said start button SA is parallel with the normally opened contact KM2 of relay K M;

As shown in Figure 2, described normally closed temperature detect switch (TDS) KSD1 is arranged on the U phase stator coil of three phase electric machine, and described normally closed temperature detect switch (TDS) KSD2 is arranged on the V phase stator coil of three phase electric machine, and described normally closed temperature detect switch (TDS) KSD3 is arranged on three phase electric machine W phase stator coil;

As shown in Figure 3, have the normally opened contact KM1 of relay K M to be arranged on the power line of three phase electric machine, with plastic switch, ZK is connected in series.

Fig. 1 also shows another embodiment of a kind of motor temperature protector of the utility model, and the normally opened contact KM3 serial connection be provided with between the U phase of described three phase mains and W phase by relay K M starts the startup prompting branch road that warning light HD forms; The U phase of three phase mains and W are provided with that normally-closed contact KM4 serial connection by relay K M stops that warning light LD forms between mutually stops pointing out branch road.

Operation principle of the present utility model is: any one in the normally closed temperature detect switch (TDS) KSD1 in three phase electric machine, normally closed temperature detect switch (TDS) KSD2 and normally closed temperature detect switch (TDS) KSD3 disconnects because corresponding stator coil excess Temperature triggers its normally-closed contact, relay K M will cut off the power supply, normally opened contact KM1 disconnects, and causes three phase electric machine M to stop operating;

When running well, relay K M obtains electric, causes normally opened contact KM3 to connect, and starts warning light HD and lights, and normally-closed contact KM4 disconnects, and stops warning light LD and extinguishes, and the expression one-way motors is moved, otherwise in like manner.

In the utility model, normally closed temperature detect switch (TDS) KSD1, normally closed temperature detect switch (TDS) KSD2 and normally closed temperature detect switch (TDS) KSD3 are selecting temperature control point with the exhausted about grade of motor as a reference, and temperature control point should be identical, and the temperature detect switch (TDS) of KSD9700 of all take is example.

Claims

1. a motor temperature protector is characterized in that: comprising:

2. a kind of motor temperature protector according to claim 1 is characterized in that: the normally opened contact KM3 serial connection that the U phase of described three phase mains and W are provided with by relay K M between mutually starts the startup prompting branch road that warning light HD forms; The U phase of three phase mains and W are provided with that normally-closed contact KM4 serial connection by relay K M stops that warning light LD forms between mutually stops pointing out branch road.