CN203367990U

CN203367990U - Motor forward and reverse rotation protection device

Info

Publication number: CN203367990U
Application number: CN 201320419278
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 discloses a motor protection device, and specifically relates to a motor forward and reverse rotation protection device. The motor forward and reverse rotation protection device is characterized in that a master control loop comprises a start button SA1, a contactor 1KM, a normally-closed contact 2KM1 of a contactor 2KM, a stop button SB, a normally-closed temperature control switch KSD1, a normally-closed temperature control switch KSD2 and a normally-closed temperature control switch KSD3 which are serially connected successively, wherein the start button SA1 is connected in parallel with a normally open contact 1KM3 of the contactor 1KM; additionally, the master control loop further comprises a start button SA2, a contactor 2KM and a normally-closed contact 1KM1 of the contactor 1KM which are serially connected successively from a power source U, wherein the elements are connected between the normally-closed contact 2KM1 of the contactor 2KM and the stop button SB, and the start button SA2 is connected in parallel with a normally open contact 2KM2 of the contactor 2KM, etc. When the motor is in both of the forward rotation and the reverse rotation, the motor forward and reverse rotation protection device can be used to perform comprehensive and high-sensitivity real-time monitoring on the temperature of each stator coil of a 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 positive and inverse protective device

Technical field

The utility model relates to a kind of electric motor protective device, is specifically related to a kind of motor positive and inverse protective device.

Background technology

While the situation such as overload, phase shortage, blocking occurring in the forward and backward running when motor, while continuing operation, 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, the apparatus structure complexity, high cost, and also 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 positive and inverse protective device, has solved current electric motor protective device insufficient sensitivity, and operating temperature just differs, complex structure, the problem that cost is too high.

For solving above-mentioned technical problem, the utility model by the following technical solutions: a kind of motor positive and inverse protective device, comprise and be connected to power supply U phase and the power supply W main control loop between mutually,

Described main control loop comprises start button SA1, contactor 1KM, normally-closed contact 2KM1, the stop button SB of contactor 2KM, normally closed temperature detect switch (TDS) KSD1, normally closed temperature detect switch (TDS) KSD2 and the normally closed temperature detect switch (TDS) KSD3 of serial connection successively, wherein start button SA1 is parallel with the normally opened contact 1KM3 of contactor 1KM

Main control loop also comprises from power supply U phase start button SA2, the contactor 2KM of serial connection successively and the normally-closed contact 1KM1 of contactor 1KM in addition, be connected between the normally-closed contact 2KM1 and stop button SB of contactor 2KM, wherein said start button SA2 is parallel with the normally opened contact 2KM2 of contactor 2KM;

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

There is the normally opened contact 1KM0 of relay 1KM to be serially connected in the forward supply line of described three phase electric machine, have the normally opened contact 2KM0 of relay 2KM to be serially connected in the reversion supply line of described three phase electric machine.

Further technical scheme is, the normally opened contact 1KM3 and the forward that are serially connected with successively relay 1KM between described power supply U phase and power supply W phase start warning light HD-1; The normally opened contact 2KM3 and the reversion that are serially connected with successively relay 2KM between described power supply U phase and power supply W phase start warning light LD-1.

Further technical scheme is, described power supply U phase and power supply W be serially connected with successively between mutually relay 1KM normally-closed contact 1KM4, relay 2KM normally-closed contact 2KM4 and stop warning light LD.

Compared with prior art; the beneficial effects of the utility model are: when motor the time can both comprehensive, highly sensitive each stator coil temperature to three phase electric machine be monitored in real time in forward, reversion; 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 the utility model motor positive and inverse protective device: a kind of motor positive and inverse protective device, comprise the main control loop be connected between power supply U phase and power supply W phase,

As shown in Figure 1, described main control loop comprises start button SA1, contactor 1KM, normally-closed contact 2KM1, the stop button SB of contactor 2KM, normally closed temperature detect switch (TDS) KSD1, normally closed temperature detect switch (TDS) KSD2 and the normally closed temperature detect switch (TDS) KSD3 of serial connection successively, wherein start button SA1 is parallel with the normally opened contact 1KM3 of contactor 1KM

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

As shown in Figure 3, there is the normally opened contact 1KM0 of relay 1KM to be serially connected in the forward supply line of described three phase electric machine, have the normally opened contact 2KM0 of relay 2KM to be serially connected in the reversion supply line of described three phase electric machine.

Fig. 1 also shows another embodiment of the utility model motor positive and inverse protective device, and the normally opened contact 1KM3 and the forward that are serially connected with successively relay 1KM between described power supply U phase and power supply W phase start warning light HD-1; The normally opened contact 2KM3 and the reversion that are serially connected with successively relay 2KM between described power supply U phase and power supply W phase start warning light LD-1.

Fig. 1 also shows another embodiment of the utility model motor positive and inverse protective device, described power supply U phase and power supply W be serially connected with successively between mutually relay 1KM normally-closed contact 1KM4, relay 2KM normally-closed contact 2KM4 and stop warning light LD.

Operation principle of the present utility model is: no matter motor is in forward or inverted status, any one in 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 1KM or relay 2KM outage, normally opened contact 1KM0 or normally opened contact 2KM0 disconnect, and cause three phase electric machine M to stop operating.

And when three phase electric machine during in the forward state, relay 1KM is in "on" position, its normally opened contact 1KM3 closure, forward starts warning light HD-1 and lights.

When three phase electric machine during in inverted status, relay 2KM is in "on" position, its normally opened contact 2KM3 closure, and forward starts warning light LD-1 and lights.

When three phase electric machine quits work, be that the normally-closed contact 1KM4 of relay 1KM and the normally-closed contact 2KM4 of relay 2KM, all in closure state, stop warning light LD and light.

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 positive and inverse protective device is characterized in that: comprises and is connected to power supply U phase and the power supply W main control loop between mutually,

2. a kind of motor positive and inverse protective device according to claim 1, is characterized in that: the normally opened contact 1KM3 and the forward startup warning light HD-1 that are serially connected with successively relay 1KM between described power supply U phase and power supply W phase; The normally opened contact 2KM3 and the reversion that are serially connected with successively relay 2KM between described power supply U phase and power supply W phase start warning light LD-1.

3. a kind of motor positive and inverse protective device according to claim 1 is characterized in that: described power supply U phase and power supply W be serially connected with successively between mutually relay 1KM normally-closed contact 1KM4, relay 2KM normally-closed contact 2KM4 and stop warning light LD.