CN212278670U

CN212278670U - Open-loop and closed-loop integration of three-phase asynchronous motor

Info

Publication number: CN212278670U
Application number: CN202020883098.0U
Authority: CN
Inventors: 王克丰
Original assignee: Haiyan Ideal Electronic Technology Co ltd
Current assignee: Haiyan Ideal Electronic Technology Co ltd
Priority date: 2020-05-23
Filing date: 2020-05-23
Publication date: 2021-01-01
Anticipated expiration: 2030-05-23

Abstract

The utility model discloses a three-phase asynchronous machine open-loop and closed-loop integration belongs to three asynchronous machine control field, the power distribution box comprises a box body, the refrigerator is installed in the bottom left side of box, and air conditioning calandria are located box inner wall left side to the output of refrigerator, the controller is installed to the lateral wall of refrigerator, the output of controller and the input electric connection of refrigerator, hinged joint is passed through on the lateral wall right side of box and the lateral wall left side of baffle. The utility model discloses a thereby refrigerator and fan mutually support can cool down to the electric elements in the box to can protect electric elements, the mutually supporting of rethread baffle, hinge and dust screen, thereby can prevent that some dust from entering into all to closed-loop controller and open-loop controller to its protection, be fit for being extensively promoted and used.

Description

Open-loop and closed-loop integration of three-phase asynchronous motor

Technical Field

The utility model relates to a three asynchronous machine control technical field especially relates to a three-phase asynchronous machine open-loop and closed loop are integrated.

Background

When the BLDC motor is controlled, if the open-loop control method is not suitable for switching to the closed-loop control method, the closed-loop control is out of control, when the motor is switched into the closed loop from the open loop at a certain load TL at a speed SL, a PWM duty ratio DL exists, so that the open loop is ideally and reliably switched into the closed loop, generally, the DL is the duty ratio of stable work of the motor at SL, when the motor works under different working conditions, the load during starting is different, the reliable closed-loop switching-in DL is also different, and if the closed-loop switching-in DL is fixed, the driving requirement of a large load range is difficult to meet, and the open-loop switching-in and. And because the water pump works under different working conditions, the load of the water pump is different, so that if starting is switched into the closed loop from the open loop with a fixed PWM duty ratio, the failure of switching into the closed loop can be caused.

Patent number CN20181125 discloses a control method of open-loop switching closed-loop of six-step control of three-phase BLDC motor, which belongs to the technical field of video monitoring, and sets a PWM duty ratio interval when driving to open-loop target rotation speed, and when entering the interval, drives the PWM duty ratio larger than the PWM duty ratio of closed-loop theory when maximum load, sets the PWM duty ratio slightly smaller than the minimum load at the end of the interval, and decreases when the entire interval duty ratio is decreased, when the time length of the interval is reasonably set, there is inevitably a zero-crossing point of the PWM voltage rising section at about the middle position of the entire commutation period, and the zero-crossing point of the PWM voltage falling section at about the middle position of the entire commutation period, and the moment is taken as the ideal moment of switching from open-loop to closed-loop, thereby realizing the technical problem of reliable open-loop switching to closed-loop Reliable switching method of ring.

At present, the technology has certain defects: 1. when the closed-loop controller and the open-loop controller work, a large amount of heat is generated to damage electrical components; 2. dust easily enters the box body to damage the closed-loop controller and the open-loop controller.

SUMMERY OF THE UTILITY MODEL

The utility model provides a three-phase asynchronous machine open-loop and closed-loop integration, thereby mutually support through refrigerator and fan and can cool down to the electric elements in the box to can protect electric elements, the mutually supporting of rethread baffle, hinge and dust screen, thereby can prevent that some dust from entering into all to closed-loop control ware and open-loop control ware to its protection, can effectively solve the problem in the background art.

The utility model provides a specific technical scheme as follows:

the utility model provides a pair of three-phase asynchronous machine open-loop and closed-loop integration, the power distribution box comprises a box body, the refrigerator is installed in the bottom left side of box, and air conditioning calandria are located the box inner wall left side to the output of refrigerator, the controller is installed to the lateral wall of refrigerator, the output of controller and the input electric connection of refrigerator, hinged joint is passed through on the lateral wall right side of box and the lateral wall left side of baffle, the handle is installed to the lateral wall of baffle, logical groove has been seted up at the inside wall left side top of box, logical inside wall of groove is installed the fan, logical right side of groove is installed dust screen and is.

Optionally, a transverse plate A is installed on the inner side wall of the box body, and an open-loop controller is installed at the top of the transverse plate A.

Optionally, a transverse plate B is installed on the inner side wall of the box body, and a closed-loop controller is installed on the outer side wall of the transverse plate B.

Optionally, the output end of the open-loop controller and the output end of the closed-loop controller are both electrically connected to the input end of the fan.

Optionally, the input end of the controller, the input end of the closed-loop controller, and the input end of the open-loop controller are electrically connected to the output end of the external power supply.

The utility model has the advantages as follows:

1. the utility model discloses it is practical, convenient operation and excellent in use effect, the output of controller and the input of refrigerator are electric connection, thereby open the controller refrigerator and begin the gas that the compressor compressed is cooled down in the condenser first, give off heat to cooling water (or air), then flow through the regenerator and be further cooled by the gas that flows back, and enter the adiabatic expansion of expander, the pressure and the temperature of compressed gas descend simultaneously, gas does work outwards when expanding in the expander, become a part of compressor input work, gas after the while inflation enters the cold box, absorb the heat of the object that is cooled, reach the purpose of refrigeration promptly, because the output of refrigerator installs the air conditioning calandria, the air conditioning calandria is located the box inboard, because the inside wall left side top of box has seted up logical groove, the logical groove inside wall installs the fan, the output of fan respectively with open loop controller's input and closed loop controller's input electric connection, thereby no matter closed-loop controller control motor or open-loop controller control motor, the fan all operates to make the interior air flow of box, thereby can cool off electrical components in the box, thereby protect electrical components.

2. The utility model discloses in, hinged joint is passed through in the lateral wall right side of box and the lateral wall left side of baffle, thereby the baffle can rotate at the lateral wall of box, the handle is installed to the lateral wall of baffle, seal the baffle to the box through the pulling handle, again because logical groove has been seted up at the inside wall left side top of box, the dust screen is installed on the inside wall right side that leads to the groove, the dust screen is located the right side of fan, thereby can prevent that the fan from blowing in the box with the dust, thereby can protect closed-loop control ware and open-loop control ware.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

Fig. 1 is a schematic diagram of an overall structure of an open-loop and closed-loop integration of a three-phase asynchronous motor according to an embodiment of the present invention;

fig. 2 is the embodiment of the present invention discloses a schematic diagram of a three-phase asynchronous motor open-loop and closed-loop integrated through groove structure.

In the figure: 1. a box body; 2. a baffle plate; 3. a hinge; 4. a refrigerator; 5. a controller; 6. a cold air exhaust pipe; 7. an open-loop controller; 8. a handle; 9. a transverse plate A; 10. a closed-loop controller; 11. a transverse plate B; 12. A dust screen; 13. a fan; 14. a through groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, 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.

The following will describe in detail the integration of open loop and closed loop of a three-phase asynchronous motor according to an embodiment of the present invention with reference to fig. 1 to 2.

As shown in fig. 1-2, a three-phase asynchronous motor open-loop and closed-loop integration, including box 1, refrigerator 4 is installed in the bottom left side of box 1, and air conditioning calandria 6 are located box 1 inside wall left side are installed to refrigerator 4's output, controller 5 is installed to refrigerator 4's lateral wall, controller 5's output and refrigerator 4's input electric connection, hinge 3 is connected on box 1's lateral wall right side and baffle 2's lateral wall left side, handle 8 is installed to baffle 2's lateral wall, logical groove 14 has been seted up at box 1's inside wall left side top, fan 13 is installed to logical groove 14's inside wall, dustproof net 12 and dustproof net 12 are located fan 13 right side are installed on logical groove 14's right side. The refrigerator and the fan are matched with each other, so that the electric element in the box can be cooled, the electric element can be protected, and the baffle, the hinge and the dustproof net are matched with each other, so that part of dust can be prevented from entering the closed-loop controller and the open-loop controller to protect the closed-loop controller and the open-loop controller.

In this embodiment, as shown in fig. 1, a transverse plate a9 is installed on the inner side wall of the box body 1, and an open-loop controller 7 is installed on the top of the transverse plate a 9. Wherein, the loop of the switching control motor is convenient.

In this embodiment, as shown in fig. 1, a transverse plate B11 is installed on the inner side wall of the box body 1, and the closed-loop controller 10 is installed on the outer side wall of the transverse plate B11. Wherein, the loop of the switching control motor is convenient.

In this embodiment, as shown in fig. 1, the output end of the open-loop controller 7 and the output end of the closed-loop controller 10 are both electrically connected to the input end of the fan 13. Wherein, simple structure can effectually dispel the heat.

In this embodiment, as shown in fig. 1, the input terminal of the controller 5, the input terminal of the closed-loop controller 10, and the input terminal of the open-loop controller 7 are electrically connected to the output terminal of the external power supply. Wherein, can timely cutting off power prevents the electric shock emergence.

It should be noted that, the utility model relates to a three-phase asynchronous motor open-loop and closed-loop integration, in operation, switch on the external power supply, the lateral wall right side of box 1 is connected with the lateral wall left side of baffle 2 through hinge 3, thereby baffle 2 can rotate at the lateral wall of box 1, handle 8 is installed to the lateral wall of baffle 2, seal box 1 through pulling handle 8 with the baffle, because logical groove 14 has been seted up at the left top of the inside wall of box 1, dustproof net 12 is installed on the right side of the inside wall of logical groove 14, dustproof net 12 is located the right side of fan 13, thereby can prevent fan 13 from blowing in the dust into box 1, thereby can protect closed-loop controller 10 and open-loop controller 7, the output of controller 5 is electrically connected with the input of refrigerator 4, thereby open controller 5 the gas that refrigerator 4 begins to work the compressor compression is cooled down in the condenser first, the heat is discharged to the cooling water (or air), then flows through the heat regenerator to be further cooled by the return gas, and enters the expander for adiabatic expansion, the pressure and the temperature of the compressed gas are simultaneously reduced, the gas does work outwards when expanding in the expander, and becomes a part of the input work of the compressor, and the expanded gas enters the cold box to absorb the heat of the cooled object, so as to achieve the purpose of refrigeration, and because the output end of the refrigerator 4 is provided with the cold air exhaust pipe 6, the cold air exhaust pipe 6 is positioned at the inner side of the box body 1, and because the top of the left side of the inner side wall of the box body 1 is provided with the through groove 14, the inner side wall of the through groove 14 is provided with the fan 13, the output end of the fan 13 is respectively electrically connected with the input end of the open-loop controller 7 and the input end of the closed-loop controller 10, so that no matter whether the closed-loop, thereby, the electric components in the case 1 can be cooled and protected. The specific model of the component is a refrigerator BGK1801-18 (the gas compressed by the compressor, which starts to work in the refrigerator, is cooled in a condenser, releases heat to cooling water (or air), then flows through a heat regenerator to be further cooled by return gas, and enters an expander for adiabatic expansion, the pressure and temperature of the compressed gas are reduced at the same time, the gas does work outwards when expanding in the expander, becomes a part of the input work of the compressor, and the expanded gas enters a cold box to absorb the heat of the cooled object, thereby achieving the purpose of refrigeration); knudu OVKS fan.

The utility model discloses a three-phase asynchronous motor open loop and closed loop integration 1, box body; 2. a baffle plate; 3. a hinge; 4. a refrigerator; 5. a controller; 6. a cold air exhaust pipe; 7. an open-loop controller; 8. a handle; 9. a transverse plate A; 10. a closed-loop controller; 11. a transverse plate B; 12. a dust screen; 13. a fan; 14. the channel members are all standard or known to those skilled in the art, and their structure and principle are known to those skilled in the art through technical manuals or through routine experimentation.

It is apparent that those skilled in the art can make various changes and modifications to the embodiments of the present invention without departing from the spirit and scope of the embodiments of the present invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. The open-loop and closed-loop integration of the three-phase asynchronous motor comprises a box body (1) and is characterized in that, a refrigerator (4) is arranged on the left side of the bottom of the box body (1), a cold air exhaust pipe (6) is arranged at the output end of the refrigerator (4), the cold air exhaust pipe (6) is positioned on the left side of the inner side wall of the box body (1), the outer side wall of the refrigerator (4) is provided with a controller (5), the output end of the controller (5) is electrically connected with the input end of the refrigerator (4), the right side of the outer side wall of the box body (1) is connected with the left side of the outer side wall of the baffle plate (2) through a hinge (3), a handle (8) is arranged on the outer side wall of the baffle (2), a through groove (14) is arranged at the top of the left side of the inner side wall of the box body (1), fan (13) are installed to the inside wall that leads to groove (14), dust screen (12) and dust screen (12) are located fan (13) right side are installed to the right side that leads to groove (14).

2. The integration of open loop and closed loop of a three-phase asynchronous motor according to claim 1, characterized in that a transverse plate A (9) is installed on the inner side wall of the box body (1), and an open loop controller (7) is installed on the top of the transverse plate A (9).

3. The integration of open loop and closed loop of a three-phase asynchronous motor according to claim 1, characterized in that a transverse plate B (11) is installed on the inner side wall of the box body (1), and a closed-loop controller (10) is installed on the outer side wall of the transverse plate B (11).

4. The integration of open and closed loop of a three-phase asynchronous motor according to claim 2, characterized in that the output of the open-loop controller (7) and the output of the closed-loop controller (10) are electrically connected to the input of the fan (13).

5. The integration of open and closed loops of a three-phase asynchronous motor according to claim 4, characterized in that the input of the controller (5), the input of the closed loop controller (10) and the input of the open loop controller (7) are electrically connected to the external power supply output.