CN110835041B - Star-sealing circuit design method for elevator permanent magnet synchronous traction machine - Google Patents
Star-sealing circuit design method for elevator permanent magnet synchronous traction machine Download PDFInfo
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- CN110835041B CN110835041B CN201911080111.7A CN201911080111A CN110835041B CN 110835041 B CN110835041 B CN 110835041B CN 201911080111 A CN201911080111 A CN 201911080111A CN 110835041 B CN110835041 B CN 110835041B
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- 230000001360 synchronised effect Effects 0.000 title claims abstract description 74
- 238000007789 sealing Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000005094 computer simulation Methods 0.000 claims description 6
- 238000004804 winding Methods 0.000 claims description 6
- 238000000691 measurement method Methods 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
- B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
- B66B11/04—Driving gear ; Details thereof, e.g. seals
- B66B11/043—Driving gear ; Details thereof, e.g. seals actuated by rotating motor; Details, e.g. ventilation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
- B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
- B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/06—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter
- H02P3/18—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor
- H02P3/22—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor by short-circuit or resistive braking
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Stopping Of Electric Motors (AREA)
Abstract
The invention discloses a method for designing a star sealing circuit of an elevator permanent magnet synchronous traction machine, which comprises the following steps: obtaining a plurality of torque-speed curves respectively corresponding to different series resistance values when the permanent magnet synchronous traction machine is braked in a short circuit mode through a star-sealing circuit; calculating the braking torque required by the elevator, and making an equal torque line which is equal to the braking torque required by the elevator on a plurality of torque-speed curves, wherein the equal torque line and each torque-speed curve have a left intersection point and a right intersection point, the speed corresponding to the left intersection point is the lowest braking speed of the permanent magnet synchronous tractor, and the speed corresponding to the right intersection point is the highest braking speed of the permanent magnet synchronous tractor; one of the torque-speed curves is selected from which the highest braking speed is greater than the highest permitted running speed of the elevator, and the series resistance value corresponding to this selected torque-speed curve is set as the resistance value of the series resistance. Therefore, the invention can select the series resistor with proper resistance value, and improves the safety of the elevator.
Description
Technical Field
The invention relates to a method for designing a star sealing circuit of an elevator permanent magnet synchronous traction machine.
Background
In the prior art, when the electromechanical brake braking torque of the elevator is insufficient or fails, and the weight on the car side and the weight on the counterweight side of the elevator are in an unbalanced state, the suspension system can cause the car to overspeed under the action of gravity, thereby bringing about a serious safety risk. In order to eliminate such a risk, in the permanent magnet synchronous traction machine, after a power supply circuit of the permanent magnet synchronous traction machine is cut off, three-phase windings of the permanent magnet synchronous traction machine are connected in a star connection manner by using series resistors to limit the speed of a car, which is a so-called star blocking brake technology of the permanent magnet synchronous traction machine.
For the star-sealing braking technology of the permanent magnet synchronous tractor, how to select the resistance value of the series resistor and the specification of the star-sealing contactor is a technical problem, but no clear and feasible design scheme exists in the prior art. If the selection is not proper, frequent elevator faults can be caused, and contact burning of the star-sealing contactor and damage of a frequency converter and a main machine coil can be caused if the selection is not proper, so that the speed of the car can not be reduced sometimes, and safety risks are caused.
Disclosure of Invention
An object of the present invention is to solve at least one of the above problems and disadvantages in the prior art.
According to one aspect of the invention, a method for designing a star sealing circuit of an elevator permanent magnet synchronous traction machine is provided, wherein the star sealing circuit comprises star sealing contactors and series resistors which are respectively connected in series on lead wires of a three-phase winding of the permanent magnet synchronous traction machine. The design method of the star sealing circuit of the elevator permanent magnet synchronous traction machine comprises the following steps:
s100: obtaining a plurality of torque-speed curves corresponding to different series resistance values R1, R2, R3, R4 and R5 when the permanent magnet synchronous tractor is braked in a short circuit mode through the star-sealing circuit;
s200: calculating the braking torque T required by the elevator, and making an equal torque line which is equal to the braking torque T required by the elevator on a plurality of torque-speed curves, wherein the equal torque line and each torque-speed curve have a left intersection point and a right intersection point, the speed corresponding to the left intersection point is the lowest braking speed V0 of the permanent magnet synchronous tractor, and the speed corresponding to the right intersection point is the highest braking speed V1 of the permanent magnet synchronous tractor;
s300: one torque-speed curve is selected from the torque-speed curves of which the highest braking speed V1 is greater than the highest running speed V permitted by the elevator, and the series resistance value R2 corresponding to this selected torque-speed curve is set as the resistance value R2 of the series resistance of the star circuit.
According to an exemplary embodiment of the invention, the method for designing the star closing circuit of the permanent magnet synchronous traction machine of the elevator further comprises the following steps:
s400: obtaining a plurality of impact current peak value-speed curves respectively corresponding to different series resistance values R1, R2, R3, R4 and R5 when the permanent magnet synchronous traction machine is braked in a short circuit mode through the star-sealing circuit;
s500: selecting an impact current peak value-speed curve corresponding to the resistance value R2 of the set series resistor of the star circuit, and determining the highest impact current C corresponding to the highest running speed V allowed by the elevator according to the selected impact current peak value-speed curve;
s600: and selecting the specification of the satellite contactor according to the determined highest impact current C, so that the selected satellite contactor can bear the determined highest impact current C.
According to another exemplary embodiment of the present invention, in the step S100, a plurality of torque-speed curves corresponding to different series resistance values R1, R2, R3, R4, R5 of the permanent magnet synchronous traction machine during short-circuit braking through the star circuit are calculated by using a computer simulation.
According to another exemplary embodiment of the present invention, in the step S100, a plurality of torque-speed curves corresponding to different series resistance values R1, R2, R3, R4, R5, respectively, of the permanent magnet synchronous traction machine when short-circuit braking is performed through the star circuit are drawn by using a measurement method.
According to another exemplary embodiment of the present invention, in the step S400, a plurality of impact current peak-speed curves respectively corresponding to different series resistance values R1, R2, R3, R4, R5 of the permanent magnet synchronous traction machine when short-circuit braking is performed through the star circuit are calculated by using a computer simulation.
According to another exemplary embodiment of the present invention, in the step S400, a plurality of impact current peak-speed curves corresponding to different series resistance values R1, R2, R3, R4, R5 respectively when the permanent magnet synchronous traction machine is short-circuited and braked by the star circuit are drawn by using a measurement method.
According to another exemplary embodiment of the invention, in step S300, the maximum braking speed V1 of this torque-speed curve is selected to be 1.1 to 1.3 times the maximum permitted running speed V of the elevator.
According to another exemplary embodiment of the invention, in said step S300, the maximum braking speed V1 of this torque-speed curve is selected to be 1.2 times the maximum permitted running speed V of the elevator.
According to another exemplary embodiment of the present invention, in step S600, the maximum impulse current that can be borne by the selected satellite contacts is 1.1 to 1.3 times the determined maximum impulse current C.
According to another exemplary embodiment of the present invention, in step S600, the maximum inrush current that can be borne by the selected satellite contactor is 1.2 times the determined maximum inrush current C.
In the foregoing exemplary embodiments according to the present invention, the series resistor with a suitable resistance value can be conveniently selected, so that the permanent magnet synchronous traction machine can reliably realize elevator braking, and the use safety of the elevator is improved.
In addition, in some embodiments of the invention, a star-sealing contactor with a proper specification can be conveniently selected, so that the permanent magnet synchronous traction machine can reliably realize elevator braking, and the use safety of the elevator is improved.
Other objects and advantages of the present invention will become apparent from the following description of the invention which refers to the accompanying drawings, and may assist in a comprehensive understanding of the invention.
Drawings
Fig. 1 shows a schematic diagram of a star sealing circuit of an elevator permanent magnet synchronous traction machine according to one embodiment of the present invention;
fig. 2 shows a plurality of torque-speed curves corresponding to different series resistance values respectively when the permanent magnet synchronous traction machine shown in fig. 1 is braked by a star-closing circuit in a short circuit manner;
fig. 3 shows a plurality of impact current peak-speed curves respectively corresponding to different series resistance values when the permanent magnet synchronous traction machine shown in fig. 1 is short-circuited and braked through a star-closing circuit.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings. In the specification, the same or similar reference numerals denote the same or similar components. The following description of the embodiments of the present invention with reference to the accompanying drawings is intended to explain the general inventive concept of the present invention and should not be construed as limiting the invention.
Furthermore, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments of the disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in schematic form in order to simplify the drawing.
According to one general technical concept of the present invention, there is provided a method for designing a star sealing circuit of an elevator permanent magnet synchronous traction machine, the star sealing circuit including star sealing contactors and series resistors respectively connected in series to lead wires of three-phase windings of the permanent magnet synchronous traction machine. The design method of the star sealing circuit of the elevator permanent magnet synchronous traction machine comprises the following steps: obtaining a plurality of torque-speed curves corresponding to different series resistance values R1, R2, R3, R4 and R5 when the permanent magnet synchronous tractor is braked in a short circuit mode through the star-sealing circuit; calculating the braking torque T required by the elevator, and making an equal torque line which is equal to the braking torque T required by the elevator on a plurality of torque-speed curves, wherein the equal torque line and each torque-speed curve have a left intersection point and a right intersection point, the speed corresponding to the left intersection point is the lowest braking speed V0 of the permanent magnet synchronous tractor, and the speed corresponding to the right intersection point is the highest braking speed V1 of the permanent magnet synchronous tractor; one torque-speed curve is selected from the torque-speed curves of which the highest braking speed V1 is greater than the highest running speed V permitted by the elevator, and the series resistance value R2 corresponding to this selected torque-speed curve is set as the resistance value R2 of the series resistance of the star circuit.
Fig. 1 shows a schematic diagram of a star sealing circuit of an elevator permanent magnet synchronous traction machine according to one embodiment of the present invention;
as shown in fig. 1, in the illustrated embodiment, the star circuit of the elevator permanent magnet synchronous traction machine includes star contactors 11 and series resistors 12 respectively connected in series to the lead wires of the three-phase winding of the permanent magnet synchronous traction machine 20.
As shown in fig. 1, in the illustrated embodiment, the star contactor 11 cuts off the power supply circuit between the permanent magnet synchronous traction machine 20 and the elevator inverter 30 when the electromechanical brake braking torque of the elevator is insufficient or fails and the elevator car side weight and counterweight side weight are in an unbalanced state. After the power supply circuit between the permanent magnet synchronous traction machine 20 and the elevator inverter 30 is cut off, the star contactor 11 star-connects the three-phase windings of the permanent magnet synchronous traction machine 20 in a star connection using the series resistor 12 to limit the speed of the car.
Fig. 2 shows a plurality of torque-speed curves corresponding to different series resistance values R1, R2, R3, R4, R5, respectively, of the permanent magnet synchronous traction machine shown in fig. 1 when braking is performed by a star circuit short circuit.
As shown in fig. 1 and 2, in the illustrated embodiment, the method for designing the star circuit of the permanent magnet synchronous traction machine 20 of the elevator comprises the following steps:
s100: obtaining a plurality of torque-speed curves corresponding to different series resistance values R1, R2, R3, R4 and R5 respectively when the permanent magnet synchronous tractor 20 is braked by a star-closing circuit short circuit;
s200: calculating the braking torque T required by the elevator, making an equal torque line which is equal to the braking torque T required by the elevator on a plurality of torque-speed curves, wherein the equal torque line and each torque-speed curve have a left intersection point and a right intersection point, the speed corresponding to the left intersection point is the lowest braking speed V0 of the permanent magnet synchronous tractor, and the speed corresponding to the right intersection point is the highest braking speed V1 of the permanent magnet synchronous tractor;
s300: one torque-speed curve is selected from the torque-speed curves in which the highest braking speed V1 is greater than the highest running speed V permitted for the elevator, and the series resistance value R2 corresponding to this selected torque-speed curve is set as the resistance value R2 of the series resistance 12 of the star circuit.
As shown in fig. 2, when the resistance value of the series resistor 12 is selected as R2, the braking torque T1 of the permanent magnet synchronous traction machine 20 at the highest running speed V allowed by the elevator is greater than the braking torque T required by the elevator, and therefore, elevator braking can be achieved.
Fig. 3 shows a plurality of surge current peak-speed curves corresponding to different series resistance values R1, R2, R3, R4, R5, respectively, of the permanent magnet synchronous traction machine 20 shown in fig. 1 when braking by a star circuit short circuit.
As shown in fig. 1 to 3, in the illustrated embodiment, the method for designing the star closing circuit of the permanent magnet synchronous traction machine of the elevator further comprises the following steps:
s400: obtaining a plurality of impact current peak value-speed curves respectively corresponding to different series resistance values R1, R2, R3, R4 and R5 when the permanent magnet synchronous tractor 20 is braked by a star-closing circuit in a short circuit manner;
s500: selecting a surge current peak value-speed curve corresponding to the resistance value R2 of the series resistor 12 of the set star-closing circuit, and determining the highest surge current C corresponding to the highest running speed V allowed by the elevator according to the selected surge current peak value-speed curve;
s600: the specification of the satellite contactor 11 is selected according to the determined highest inrush current C so that the selected satellite contactor 11 can bear the determined highest inrush current C.
As shown in fig. 3, the star seal contactor 11 is selected to bear the highest impact current C when the permanent magnet synchronous traction machine 20 is braked in a short circuit mode, so that the star seal contactor 11 does not have the risk of burning and the like.
As shown in fig. 1 and 2, in an exemplary embodiment of the present invention, in step S100, a plurality of torque-speed curves corresponding to different series resistance values R1, R2, R3, R4, and R5 of the permanent magnet synchronous traction machine 20 during short-circuit braking through a star circuit may be calculated by using a computer simulation.
As shown in fig. 1 and 2, in another exemplary embodiment of the present invention, in step S100, a plurality of torque-speed curves corresponding to different series resistance values R1, R2, R3, R4, and R5 of the permanent magnet synchronous traction machine 20 during short braking through a star circuit may be drawn by using a measured method.
As shown in fig. 1 to 3, in an exemplary embodiment of the present invention, in step S400, a plurality of impact current peak-speed curves corresponding to different series resistance values R1, R2, R3, R4, and R5, respectively, of the permanent magnet synchronous traction machine 20 when braking by short-circuiting a star circuit may be calculated by using a computer simulation.
As shown in fig. 1 to 3, in another exemplary embodiment of the present invention, in step S400, a plurality of impact current peak-speed curves corresponding to different series resistance values R1, R2, R3, R4, and R5, respectively, of the permanent magnet synchronous traction machine 20 during short braking through a star circuit are drawn by using a measurement method.
As shown in fig. 1 and 2, in an exemplary embodiment of the invention, the highest braking speed V1 of this torque-speed curve is selected to be 1.1 to 1.3 times the highest running speed V allowed by the elevator in step S300.
In another exemplary embodiment of the invention, as shown in fig. 1 and 2, the highest braking speed V1 of this torque-speed curve is selected to be 1.2 times the highest running speed V permitted for the elevator in step S300.
As shown in fig. 1 to 3, in an exemplary embodiment of the present invention, in step S600, the maximum inrush current that can be borne by the selected satellite contactor 11 is 1.1 to 1.3 times the determined maximum inrush current C.
In another exemplary embodiment of the present invention, as shown in fig. 1 to 3, in step S600, the maximum inrush current that can be borne by the selected satellite contactor 11 is 1.2 times the determined maximum inrush current C.
It will be appreciated by those skilled in the art that the embodiments described above are exemplary and can be modified by those skilled in the art, and that the structures described in the various embodiments can be freely combined without conflict in structure or principle.
Although the present invention has been described in connection with the accompanying drawings, the embodiments disclosed in the drawings are intended to be illustrative of preferred embodiments of the present invention and should not be construed as limiting the invention.
Although a few embodiments of the present general inventive concept have been shown and described, it will be appreciated by those skilled in the art that changes may be made in these embodiments without departing from the principles and spirit of the general inventive concept, the scope of which is defined in the appended claims and their equivalents.
It should be noted that the word "comprising" does not exclude other elements or steps, and the words "a" or "an" do not exclude a plurality. Furthermore, any reference signs in the claims shall not be construed as limiting the scope of the invention.
Claims (9)
1. A design method of a star sealing circuit of an elevator permanent magnet synchronous traction machine comprises a star sealing contactor (11) and series resistors (12) which are respectively connected in series on lead wires of a three-phase winding of the permanent magnet synchronous traction machine (20),
the design method of the star sealing circuit of the elevator permanent magnet synchronous traction machine comprises the following steps:
s100: obtaining a plurality of torque-speed curves respectively corresponding to different series resistance values R1, R2, R3, R4 and R5 when the permanent magnet synchronous traction machine (20) is braked in a short circuit mode through the star-closing circuit;
s200: calculating the braking torque T required by the elevator, and making an equal torque line which is equal to the braking torque T required by the elevator on a plurality of torque-speed curves, wherein the equal torque line and each torque-speed curve have a left intersection point and a right intersection point, the speed corresponding to the left intersection point is the lowest braking speed V0 of the permanent magnet synchronous tractor, and the speed corresponding to the right intersection point is the highest braking speed V1 of the permanent magnet synchronous tractor;
s300: selecting one torque-speed curve with the highest braking speed V1 being greater than the highest running speed V allowed by the elevator, and setting the series resistance R2 corresponding to the selected torque-speed curve as the resistance R2 of the series resistor (12) of the star circuit;
s400: obtaining a plurality of impact current peak value-speed curves respectively corresponding to different series resistance values R1, R2, R3, R4 and R5 when the permanent magnet synchronous traction machine (20) is braked in a short circuit mode through the star-sealing circuit;
s500: selecting a surge current peak value-speed curve corresponding to the resistance value R2 of the series resistor (12) of the set star circuit, and determining the highest surge current C corresponding to the highest running speed V allowed by the elevator according to the selected surge current peak value-speed curve;
s600: the specification of the satellite contacts (11) is selected according to the determined highest inrush current C, so that the selected satellite contacts (11) can bear the determined highest inrush current C.
2. The design method of the star sealing circuit of the elevator permanent magnet synchronous traction machine according to claim 1, characterized in that:
in the step S100, a plurality of torque-speed curves corresponding to different series resistance values R1, R2, R3, R4, and R5 when the permanent magnet synchronous traction machine (20) is short-circuited and braked by the star circuit are calculated by computer simulation.
3. The design method of the star sealing circuit of the elevator permanent magnet synchronous traction machine according to claim 1, characterized in that:
in the step S100, a plurality of torque-speed curves corresponding to different series resistance values R1, R2, R3, R4, and R5 when the permanent magnet synchronous traction machine (20) is short-circuited and braked by the star-closing circuit are drawn by using an actual measurement method.
4. The design method of the star sealing circuit of the elevator permanent magnet synchronous traction machine according to claim 1, characterized in that:
in the step S400, a plurality of impact current peak-speed curves corresponding to different series resistance values R1, R2, R3, R4, and R5 when the permanent magnet synchronous traction machine (20) is short-circuited and braked by the star circuit are calculated by computer simulation.
5. The design method of the star sealing circuit of the elevator permanent magnet synchronous traction machine according to claim 1, characterized in that:
in the step S400, a plurality of impact current peak-speed curves corresponding to different series resistance values R1, R2, R3, R4, and R5, respectively, of the permanent magnet synchronous traction machine (20) during short-circuit braking by the star circuit are drawn by an actual measurement method.
6. The design method of the star sealing circuit of the elevator permanent magnet synchronous traction machine according to claim 1, characterized in that:
in step S300, the maximum braking speed V1 of the selected torque-speed curve is 1.1 to 1.3 times the maximum running speed V allowed by the elevator.
7. The design method of the star sealing circuit of the elevator permanent magnet synchronous traction machine according to claim 6, characterized in that:
in said step S300, the maximum braking speed V1 of this torque-speed curve is selected to be 1.2 times the maximum permitted travel speed V of the elevator.
8. The design method of the star sealing circuit of the elevator permanent magnet synchronous traction machine according to claim 1, characterized in that:
in the step S600, the maximum impulse current which can be borne by the selected satellite contactor (11) is 1.1-1.3 times of the determined highest impulse current C.
9. The design method of the star sealing circuit of the elevator permanent magnet synchronous traction machine according to claim 8, characterized in that:
in step S600, the maximum inrush current that can be borne by the selected satellite contactor (11) is 1.2 times the determined maximum inrush current C.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911080111.7A CN110835041B (en) | 2019-11-07 | 2019-11-07 | Star-sealing circuit design method for elevator permanent magnet synchronous traction machine |
| PCT/CN2019/128291 WO2021088229A1 (en) | 2019-11-07 | 2019-12-25 | Star-connection circuit design method for elevator permanent magnet synchronous traction motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911080111.7A CN110835041B (en) | 2019-11-07 | 2019-11-07 | Star-sealing circuit design method for elevator permanent magnet synchronous traction machine |
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| Publication Number | Publication Date |
|---|---|
| CN110835041A CN110835041A (en) | 2020-02-25 |
| CN110835041B true CN110835041B (en) | 2021-04-23 |
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| CN201911080111.7A Active CN110835041B (en) | 2019-11-07 | 2019-11-07 | Star-sealing circuit design method for elevator permanent magnet synchronous traction machine |
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| CN (1) | CN110835041B (en) |
| WO (1) | WO2021088229A1 (en) |
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| CN115072531B (en) * | 2022-06-23 | 2023-10-27 | 重庆大学 | A method for improving the star-locking torque of an elevator permanent magnet synchronous traction machine |
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| WO2021088229A1 (en) | 2021-05-14 |
| CN110835041A (en) | 2020-02-25 |
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