CN215344407U - AC starting controller for three-phase squirrel-cage asynchronous motor - Google Patents
AC starting controller for three-phase squirrel-cage asynchronous motor Download PDFInfo
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- CN215344407U CN215344407U CN202121523719.5U CN202121523719U CN215344407U CN 215344407 U CN215344407 U CN 215344407U CN 202121523719 U CN202121523719 U CN 202121523719U CN 215344407 U CN215344407 U CN 215344407U
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Abstract
The AC starting controller of the three-phase squirrel-cage asynchronous motor comprises a main circuit and a control circuit which are arranged in a box body, wherein the main circuit comprises three starting resistors and four AC contactors, one ends of three pairs of main contacts of a first contactor are respectively connected with a three-phase power supply input end through the starting resistors, and the other ends of the three pairs of main contacts of the first contactor are led out of a power supply output end; three pairs of main contacts of the second contactor are respectively connected in parallel at two ends of the three starting resistors; one ends of three pairs of main contacts of the third contactor are respectively and correspondingly electrically connected with the other ends of the three pairs of main contacts of the first contactor, and the other ends of the three pairs of main contacts of the third contactor are electrically connected with each other; one ends of three pairs of main contacts of the fourth contactor are respectively and correspondingly electrically connected with one ends of the three pairs of main contacts of the first contactor, and the other ends of the three pairs of main contacts are led out of a power supply output end; the control circuit is a programmable controller. The controller can realize simple design of a control circuit, high reliability, convenient speed regulation control and small-sized design of the box body.
Description
Technical Field
The utility model belongs to the field of motor control, and particularly relates to an alternating-current starting controller of a three-phase squirrel-cage asynchronous motor.
Background
The three-phase squirrel-cage asynchronous motor has the advantages of simple structure, reliable work and the like, so that the three-phase squirrel-cage asynchronous motor is widely adopted by a dragging system. In order to realize the starting and pole-changing speed control of the motor, a control circuit is generally designed. Most of control circuits in the early years are realized by adopting relay control logic, and because the control logic uses a large number of mechanical contacts and is more and complicated in connection, a controller is generally large in size, large in power consumption and high in failure rate, and once a system is formed, the function is difficult to change or increase. In addition, the relay control logic uses a large number of mechanical contacts, the contacts can be damaged by electric arcs when opened and closed, mechanical abrasion is caused, the service life is short, the working frequency of the relay is low, and the problem of shaking of the contacts during action is solved, so that the reliability and maintainability of a control system are poor. Generally, the timing control of relay control logic is realized by adopting a time relay, and the time relay has the problems of low timing precision, narrow timing range, easy environmental influence, difficult time adjustment and the like, so that the real-time response speed of a control system is influenced. In the design and construction process, a relay control logic is used for completing an item, the design, construction and debugging of the relay control logic are required to be carried out in sequence, the period is long, and the modification is difficult, so that the application of the relay control logic circuit has certain limitation. With the advent and use of programmable controllers, there is a need to explore and popularize the application field of programmable controllers, and especially, there is a need to widely adopt the control systems for starting and speed regulation of three-phase squirrel-cage asynchronous motors.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem of providing the three-phase squirrel-cage asynchronous motor alternating-current starting controller which can realize the simple design of a control circuit, high reliability, convenient and fast speed regulation control and the miniaturized design of a box body.
In order to achieve the purpose, the utility model adopts the following technical scheme:
the alternating current starting controller of the three-phase squirrel-cage asynchronous motor comprises a box body, wherein a main circuit and a control circuit are arranged in the box body, the main circuit comprises three starting resistors and four alternating current contactors, one ends of three pairs of main contacts of a first alternating current contactor are respectively connected with a three-phase power supply input end through the starting resistors, and the other ends of the three pairs of main contacts of the first alternating current contactor are led out of a first group of power supply output ends and are used for being connected with a first speed power supply input end of the three-phase squirrel-cage asynchronous motor;
three pairs of main contacts of the second alternating current contactor are respectively connected in parallel at two ends of the three starting resistors; one ends of three pairs of main contacts of a third alternating current contactor are respectively and correspondingly electrically connected with the other ends of the three pairs of main contacts of the first alternating current contactor one by one, and the other ends of the three pairs of main contacts of the third alternating current contactor are electrically connected with each other;
one ends of three pairs of main contacts of a fourth alternating current contactor are respectively and correspondingly electrically connected with one ends of three pairs of main contacts of the first alternating current contactor one by one, and the other ends of the three pairs of main contacts of the fourth alternating current contactor are led out of a second group of power supply output ends for connecting a two-speed power supply input end of a three-phase squirrel-cage asynchronous motor;
the control circuit is a programmable controller, a control signal output end of the control circuit is respectively and electrically connected with one end of a coil of each alternating current contactor, the other end of the coil of each alternating current contactor is electrically connected with the N end of a 220V alternating current power supply and used for controlling the attraction of each alternating current contactor, so that the three-phase squirrel-cage asynchronous motor connected with each main circuit is connected with the alternating current power supply to realize the starting and speed regulation control.
Preferably, the three-phase squirrel-cage asynchronous motor ac starting controller is further provided with a state output circuit, the state output circuit comprises a plurality of electromagnetic relays, two ends of a coil of each electromagnetic relay are respectively and electrically connected with the control output end and the grounding end of the control circuit, and two ends of a normally open contact of each electromagnetic relay are respectively led out a pair of passive contacts through leads for correspondingly outputting the working state of each three-phase squirrel-cage asynchronous motor connected with the controller.
Preferably, the three starting resistors are arranged in an upper chamber at the upper end in the box body, so that the heat dissipation effect of the resistors is improved.
As a further preference, the control circuit and four ac contactors are provided in a lower chamber located below an upper chamber, and the control circuit is mounted in the middle of the lower chamber through a shield case; the four alternating current contactors are arranged in pairs and are arranged on the upper side and the lower side of the control circuit.
The utility model has the beneficial effects that:
1. the controller starting and speed regulating circuit is simple and optimized by adopting the programmable controller to design the control circuit of the three-phase squirrel-cage asynchronous motor AC starting controller, and the programmable controller stores and executes instructions to perform logic operation and sequence control, particularly a modularized installation combination mode, thereby providing a safe, reliable and perfect optimized solution for the automatic control of the AC motor. And then ensure that control process reliability is high, speed governing control is convenient, and the functioning speed is fast, and installation maintenance is simple, and the adaptability to industrial environment interference killing feature is strong, makes this controller have advantages such as control process is nimble convenient, long service life.
2. The space in the box body of the controller is optimized, and the controller is reasonable in layout, so that the appearance of the three-phase squirrel-cage asynchronous motor alternating-current starting controller is exquisite and attractive, the inner chamber is reasonable and simple in layout, and the controller has the excellent performances of small volume, light weight, convenience and flexibility in control and maintenance and strong anti-interference capability.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a left side view of fig. 1.
Fig. 3 is a schematic view of the internal structure of the box body with the box door removed.
Fig. 4 is a circuit schematic of the present invention.
In the figure: the box body 1, the box door 2, the shock absorber 3, the shielding case 4, the control circuit 5, the main circuit 6 and the state output circuit 7.
Detailed Description
Reference will now be made in detail to embodiments of the present patent, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present patent and are not to be construed as limiting the present patent.
As shown in fig. 1 and 2, the ac starting controller of the three-phase squirrel-cage asynchronous motor according to the present invention comprises a box body 1, a box door 2 hinged to the front of the box body 1, a wire mesh shielding gasket (not shown in the figure) arranged between the inner side of the box door 2 and the spigot of the box body 1, and four shock absorbers 3 symmetrically fixed to the back of the box body 1 for improving the performance of vibration and impact resistance during wall-mounted installation.
As shown in fig. 3 and 4, a main circuit 6 and a control circuit 5 are arranged in a box 1, the main circuit 6 includes three starting resistors R1-R3 and four ac contactors KM 1-KM 4, wherein one ends of three pairs of main contacts of a first ac contactor KM1 are respectively connected to three-phase power input ends L1-L3 through the starting resistors R1-R3, and the other ends of the three pairs of main contacts of the first ac contactor KM1 are led out of a first group of power output ends for connecting to a first speed power input end of a corresponding three-phase squirrel-cage asynchronous motor; the influence of impact current on a power grid during starting can be reduced through the starting resistors R1-R3, and the voltage reduction starting of the alternating current motor is realized;
three pairs of main contacts of the second alternating current contactor KM2 are respectively connected in parallel at two ends of three starting resistors R1-R3; one ends of three pairs of main contacts of a third alternating current contactor KM3 are respectively and correspondingly electrically connected with the other ends of the three pairs of main contacts of a first alternating current contactor KM1, and the other ends of the three pairs of main contacts of the third alternating current contactor KM3 are mutually and electrically connected;
one ends of three pairs of main contacts of a fourth alternating current contactor KM4 are respectively and correspondingly electrically connected with one ends of three pairs of main contacts of the first alternating current contactor KM1, and the other ends of the three pairs of main contacts of the fourth alternating current contactor KM4 are led out of a second group of power supply output ends for connecting two-speed power supply input ends of corresponding three-phase squirrel-cage asynchronous motors.
The control circuit 5 is a programmable controller, a control signal output pin of the programmable controller is electrically connected with one end of a coil of each alternating current contactor KM 1-KM 4 in each main circuit 6 in a one-to-one correspondence manner, the other end of the coil of each alternating current contactor KM 1-KM 4 is electrically connected with the N end of a 220V alternating current power supply, and the control circuit is used for controlling the attraction and conduction of each alternating current contactor, so that a three-phase squirrel-cage asynchronous motor connected with each main circuit 6 is connected with the alternating current power supply, and starting and speed regulation control are realized.
The three-phase squirrel-cage asynchronous motor alternating current starting controller is further provided with a state output circuit 7, the state output circuit 7 comprises a plurality of electromagnetic relays, four electromagnetic relays are taken as an example in the embodiment and are KA 1-KA 4 in sequence, two ends of a coil of each electromagnetic relay are electrically connected with a control signal output end and a grounding end of the programmable controller respectively, and two ends of a normally open contact of each electromagnetic relay are led out of a pair of passive contacts through leads respectively for correspondingly outputting the working state of each three-phase squirrel-cage asynchronous motor connected with the programmable controller.
As shown in fig. 3, the three starting resistors are disposed in the upper chamber 101 at the upper end of the case 1 to improve the heat dissipation effect of the resistors. The control circuit 5 and four alternating current contactors of each main circuit 6 are arranged in a lower chamber 102 positioned below an upper chamber in the box body, and the control circuit 5 is arranged in the middle of the lower chamber through a shielding cover 4; the four alternating current contactors of each main circuit 6 are symmetrically arranged in pairs and are installed on the upper side and the lower side of the control circuit 5.
As shown in fig. 4, the main circuit 6 is multiple and each main circuit is arranged in an independent box 1 so as to be connected with each three-phase squirrel-cage asynchronous motor.
When the three-phase squirrel-cage asynchronous motor AC starting controller works, the input points of the three-phase squirrel-cage asynchronous motor AC starting controller are respectively connected with the control switch to input starting and stopping signals, first-speed and second-speed starting signals of the motor, and state signals of a control process comprise state signals of readiness, whether a fault exists and the like. When the motor is ready and works normally, the first-speed signal is switched on, the second-speed signal is switched off, then a starting signal (starting signal is switched on) is given, and the motor is controlled to start at the first speed through the programmable controller, namely, the first alternating current contactor KM1 is controlled to be sucked in first, so that the first-speed power supply input end of the corresponding motor is switched on to realize reduced-voltage starting; after 3 seconds, the programmable controller controls the second alternating current contactor KM2 to be attracted and conducted, the starting resistor is in short circuit, and after the alternating current contactors KM1 and KM2 are connected, the corresponding motor enters a first-speed running state. When the motor needs to operate in a second-speed state, a second-speed signal is connected, the first-speed signal and the starting signal are kept connected, the stopping signal is kept disconnected, the motor is controlled to start at the second speed through the programmable controller, namely the programmable controller controls the alternating current contactors KM1 and KM2 to be disconnected firstly, the KM4 and the KM3 are attracted and connected, the alternating current contactors KM2 are controlled to be attracted and connected after 3 seconds, the starting resistors are in short circuit, and the corresponding motor is connected with a power supply to enter the second-speed operation state. The motor can be stopped by switching on the stop signal and switching off the start signal and the first-speed and second-speed signals.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and equivalent alternatives or modifications according to the technical solution of the present invention and the inventive concept thereof should be covered by the scope of the present invention.
Claims (4)
1. The utility model provides a three-phase squirrel-cage asynchronous motor exchanges start controller, includes the box, characterized by: a main circuit and a control circuit are arranged in the box body, the main circuit comprises three starting resistors and four alternating current contactors, wherein one ends of three pairs of main contacts of the first alternating current contactor are respectively connected with a three-phase power supply input end through the starting resistors, and the other ends of the three pairs of main contacts of the first alternating current contactor are led out of a first group of power supply output ends for being connected with a first speed power supply input end of a three-phase squirrel-cage asynchronous motor;
three pairs of main contacts of the second alternating current contactor are respectively connected in parallel at two ends of the three starting resistors; one ends of three pairs of main contacts of a third alternating current contactor are respectively and correspondingly electrically connected with the other ends of the three pairs of main contacts of the first alternating current contactor one by one, and the other ends of the three pairs of main contacts of the third alternating current contactor are electrically connected with each other;
one ends of three pairs of main contacts of a fourth alternating current contactor are respectively and correspondingly electrically connected with one ends of three pairs of main contacts of the first alternating current contactor one by one, and the other ends of the three pairs of main contacts of the fourth alternating current contactor are led out of a second group of power supply output ends for connecting a two-speed power supply input end of a three-phase squirrel-cage asynchronous motor;
the control circuit is a programmable controller, a control signal output end of the control circuit is respectively and electrically connected with one end of a coil of each alternating current contactor, the other end of the coil of each alternating current contactor is electrically connected with the N end of a 220V alternating current power supply and used for controlling the attraction of each alternating current contactor, so that the three-phase squirrel-cage asynchronous motor connected with each main circuit is connected with the alternating current power supply to realize the starting and speed regulation control.
2. The three-phase squirrel-cage asynchronous motor ac start controller of claim 1, wherein: the three-phase squirrel-cage asynchronous motor alternating current starting controller is further provided with a state output circuit, the state output circuit comprises a plurality of electromagnetic relays, two ends of a coil of each electromagnetic relay are respectively and electrically connected with a control output end and a grounding end of the control circuit, and two ends of a normally open contact of each electromagnetic relay are respectively led out of a pair of passive contacts through a lead for correspondingly outputting the working state of each three-phase squirrel-cage asynchronous motor connected with the controller.
3. The three-phase squirrel-cage asynchronous motor ac start controller of claim 1, wherein: the three starting resistors are arranged in the upper chamber at the upper end in the box body, so that the heat dissipation effect of the resistors is improved.
4. The three-phase squirrel-cage asynchronous motor ac start controller of claim 3, wherein: the control circuit and the four alternating current contactors are arranged in a lower chamber below the upper chamber, and the control circuit is arranged in the middle of the lower chamber through a shielding cover; the four alternating current contactors are arranged in pairs and are arranged on the upper side and the lower side of the control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121523719.5U CN215344407U (en) | 2021-07-06 | 2021-07-06 | AC starting controller for three-phase squirrel-cage asynchronous motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121523719.5U CN215344407U (en) | 2021-07-06 | 2021-07-06 | AC starting controller for three-phase squirrel-cage asynchronous motor |
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| Publication Number | Publication Date |
|---|---|
| CN215344407U true CN215344407U (en) | 2021-12-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121523719.5U Active CN215344407U (en) | 2021-07-06 | 2021-07-06 | AC starting controller for three-phase squirrel-cage asynchronous motor |
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| Country | Link |
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| CN (1) | CN215344407U (en) |
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2021
- 2021-07-06 CN CN202121523719.5U patent/CN215344407U/en active Active
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