CN210517774U

CN210517774U - Motor open-phase protection circuit and three-phase motor device

Info

Publication number: CN210517774U
Application number: CN201921514874.3U
Authority: CN
Inventors: 刘福林
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-09-11
Filing date: 2019-09-11
Publication date: 2020-05-12
Anticipated expiration: 2029-09-11

Abstract

The utility model relates to a motor open-phase protection circuit, which comprises an AC contactor KM1, an intermediate relay KA1, a stop button SB-1 and a start button SB-2, wherein a three-phase motor M is connected to an AC power supply through a main contact of the AC contactor KM 1; the A-phase power supply of the alternating current power supply is connected with one end of a stop button SB-1, the other end of the stop button SB-1 is connected with one end of an alternating current contactor KM1 through a normally open contact KA1-2 of an intermediate relay KA1, and the other end of the alternating current contactor KM1 is connected with the C-phase power supply of the alternating current power supply; a B-phase power supply of an alternating current power supply is connected to one end of a starting button SB-2 and one end of a normally open contact KA1-1 of an intermediate relay KA1 through an intermediate relay KA1, and the other end of the starting button SB-2 and the other end of the normally open contact KA1-1 of the intermediate relay KA1 are connected with the other end of a stopping button SB-1. The utility model discloses optimized the open-phase protector structure, simple operation is but reliable, and has reduced the wiring degree of difficulty, can conveniently install additional on various lathe. The utility model discloses still provide three-phase motor device.

Description

Motor open-phase protection circuit and three-phase motor device

Technical Field

The utility model belongs to the technical field of the electric machine control technique and specifically relates to a motor open-phase protection circuit and three-phase motor device are related to.

Background

In the operation process of a three-phase motor, if a certain phase power supply line is disconnected, the motor is caused to have a phase loss phenomenon, the phase loss operation of the motor is one of important reasons for motor burnout, the motor is damaged due to sudden phase loss, a lot of troubles are brought to production and life, the repair time of the motor after the phase loss burnout is longer, and the economic benefit of a user is directly influenced. Therefore, the motor needs to be provided with the phase-lack protector, but the phase-lack protector used in the current market has a complex structure, can be used by wiring by personnel with corresponding professional qualifications, has a huge appearance, is expensive, and limits popularization and use.

SUMMERY OF THE UTILITY MODEL

The utility model provides a motor lacks looks protection circuit and three-phase motor device to solve the complicated technical problem of current lack looks protector structure, the utility model discloses having optimized lack looks protector structure, can having avoided the motor to run under the lack looks condition and cause the damage, simple operation is but reliable, and has reduced the wiring degree of difficulty, can install additional in the former electronic box of various lathe, occupation space not.

In order to solve the technical problem, the embodiment of the utility model provides a motor open-phase protection circuit, including ac contactor KM1, auxiliary relay KA1, stop button SB-1, start button SB-2, three-phase motor M is connected to ac power supply through the main contact of ac contactor KM 1;

the A-phase power supply of the alternating current power supply is connected with one end of the stop button SB-1, the other end of the stop button SB-1 is connected with one end of the alternating current contactor KM1 through the normally open contact KA1-2 of the intermediate relay KA1, and the other end of the alternating current contactor KM1 is connected with the C-phase power supply of the alternating current power supply;

the B-phase power supply of the alternating current power supply is connected to one end of the starting button SB-2 through the intermediate relay KA1, one end of the normally open contact KA1-1 of the intermediate relay KA1, and the other end of the stopping button SB-2 and the other end of the normally open contact KA1-1 of the intermediate relay KA1 are connected with the other end of the starting button SB-1.

Preferably, the alternating current power supply is a 380V alternating current power supply.

Preferably, the system further comprises a three-phase circuit breaker QS;

the A-phase power supply of the alternating current power supply is connected to one end of the stop button SB-1 through the three-phase circuit breaker QS and the fuse FU-1;

the B-phase power supply of the alternating current power supply is connected to the intermediate relay KA1 through the three-phase circuit breaker QS and the fuse FU-2;

the C-phase power supply of the ac power supply is connected to the ac contactor KM1 through the three-phase circuit breaker QS and the fuse FU-3.

The utility model also provides a three-phase motor device, including alternating current power supply, three-phase motor M and foretell motor open-phase protection circuit, the motor open-phase protection circuit is connected alternating current power supply with between the three-phase motor M.

Compared with the prior art, the embodiment of the utility model has the beneficial effects that, the embodiment of the utility model provides a motor phase loss protection circuit, it is when three-phase motor M operates, when A looks power takes place to lack the looks, auxiliary relay KA1 loses the electricity, thereby the normally open contact KA1-1, KA1-2 of auxiliary relay KA1 reset the disconnection, cause alternating current contactor KM1 directly cuts off the power supply, then three-phase motor M stops operating immediately, reaches the effect of protection motor; when the phase-B power supply is in phase loss, the intermediate relay KA1 loses power, so that the normally open contact KA1-2 of the intermediate relay KA1 is reset and disconnected, the alternating current contactor KM1 is powered off, the three-phase motor M stops running immediately, and the effect of protecting the motor is achieved; when the phase lack occurs to the C-phase power supply, the alternating current contactor KM1 is directly powered off, so that the three-phase motor M immediately stops running, and the motor is protected. The utility model discloses optimized the open-phase protector structure, simple operation is but reliable, and has reduced the wiring degree of difficulty, can install additional on various lathe. The circuit structure of the embodiment has the advantages of small volume, low price, easiness in popularization and the greatest advantage, does not occupy the space of an original electric box, controls the power-off of the open-phase protection of the motor by utilizing the on-off of the relay contact, and is safe and reliable. The embodiment of the utility model provides a still provide a three-phase motor device.

Drawings

Fig. 1 is a circuit structure diagram of a motor open-phase protection circuit in an embodiment of the present invention;

fig. 2 is a circuit structure diagram of the open-phase protection circuit of the motor in the embodiment of the present invention;

FIGS. 3A-3C are circuit wiring diagrams of relay mounts adapted for the motor phase loss protector of FIGS. 1 and 2;

fig. 4A-4D are printed wiring diagrams of the motor open-phase protector adapted to fig. 1 and 2.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Referring to fig. 1 and 2, the preferred embodiment of the present invention provides a motor open-phase protection circuit, which includes an ac contactor KM1, an intermediate relay KA1, a stop button SB-1, and a start button SB-2, wherein a three-phase motor M is connected to an ac power source through a main contact of the ac contactor KM 1; main contacts KM1-1, KM1-2 and KM1-3 of the alternating current contactor KM1 are respectively connected in a three-phase circuit between the alternating current power supply and the three-phase motor M; the alternating current power supply is a 380V alternating current power supply;

the B-phase power supply of the alternating current power supply is connected to one end of the starting button SB-2 and one end of the normally open contact KA1-1 of the intermediate relay KA1 through the intermediate relay KA1, and the other end of the starting button SB-2 and the other end of the normally open contact KA1-1 of the intermediate relay KA1 are connected with the other end of the stopping button SB-1.

The working principle of the motor open-phase protection circuit is as follows:

when the three-phase motor M runs and the A-phase power supply is in phase failure, the intermediate relay KA1 loses power, so that the normally open contacts KA1-1 and KA1-2 of the intermediate relay KA1 are reset and disconnected, the alternating current contactor KM1 is directly powered off, the three-phase motor M stops running immediately, and the motor protection effect is achieved.

When the phase B power supply is in phase loss, the intermediate relay KA1 loses power, so that the normally open contact KA1-2 of the intermediate relay KA1 is reset and disconnected, the alternating current contactor KM1 is powered off, the three-phase motor M stops running immediately, and the motor protection effect is achieved.

When the phase lack occurs to the C-phase power supply, the alternating current contactor KM1 is directly powered off, so that the three-phase motor M immediately stops running, and the motor is protected.

As further optimization, motor open-phase protection circuit still includes three-phase circuit breaker QS, closes three-phase circuit breaker QS for three-phase motor M's start-up work prepares, through pressing start button SB-2 starter motor is pressing after start button SB-2, relay KA 1's coil is electrified, relay KA 1's normally open contact KA1-1, KA1-2 closed auto-lock.

Referring to fig. 3A to 3C and fig. 4A to 4D, fig. 3A to 3C are diagrams of wiring of a relay socket, and fig. 4A to 4D are diagrams of wiring of a printed wiring type, which can be wired according to the wiring diagram of a relay socket or a printed wiring board.

The utility model discloses optimized lack looks protector structure, simple operation is but reliable, and has reduced the wiring degree of difficulty, can install additional in the former electronic box of various lathe. The circuit structure of the embodiment has the advantages of small volume, low price, easiness in popularization and the greatest advantage, does not occupy the space of an original electric box, controls the power-off of the open-phase protection of the motor by utilizing the on-off of the relay contact, and is safe and reliable.

Therefore, the motor is protected from being burnt out when the motor is in a phase failure state by instantly controlling the starting and the stopping of the motor contactor through the on-off of the contact of the relay, the expenditure is saved for the country and the enterprise, and the economic benefit is improved.

The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.

Claims

1. The motor open-phase protection circuit is characterized by comprising an alternating current contactor KM1, an intermediate relay KA1, a stop button SB-1 and a start button SB-2, wherein a three-phase motor M is connected to an alternating current power supply through a main contact of the alternating current contactor KM 1;

the B phase power supply of AC power supply passes through the auxiliary relay KA1 is connected to the one end of start button SB-2, the one end of the normally open contact KA1-1 of auxiliary relay KA1 constitutes the circuit auto-lock, the other end of start button SB-2, the other end of the normally open contact KA1-1 of auxiliary relay KA1 is connected the other end of stop button SB-1.

2. The motor open-phase protection circuit of claim 1, wherein the ac power supply is a 380V ac power supply.

3. The motor open-phase protection circuit according to claim 1 or 2, characterized by further comprising a three-phase circuit breaker QS;

4. A three-phase motor apparatus comprising an ac power source, a three-phase motor M and a motor open-phase protection circuit according to any one of claims 1 to 3.