Star sealing protection device and method

Abstract

The star sealing protection device comprises a frequency converter, a frequency converter control module, a motor three-phase winding, a detection module, a first contactor and a second contactor, the input end of the frequency converter is connected with the frequency converter control module, and the output end of the frequency converter is connected with the motor three-phase winding through a normally open contact of the first contactor; a normally open contact of the first contactor is connected with a first normally open contact of the second contactor and a second normally open contact of the second contactor, and the second normally open contact of the second contactor is further connected with the input end of the detection module. The output end of the detection module is connected with the input end of the frequency converter control module and used for achieving the effect of effectiveness of the first contactor, the effect of effectiveness judgment of the star sealing effect can be effectively achieved, output of the frequency converter is controlled through the frequency converter control module, and therefore the effect of output blocking of the frequency converter is achieved. And the star sealing protection quality is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the elevator technical field, especially to a star seal protection device and method. BACKGROUND

[0002] At present, based on the outstanding advantages of energy saving and high efficiency, the driving host of the elevator mainly adopts permanent magnet synchronous motor. Usually, when the elevator safety related design is carried out, the structure principle of the permanent magnet synchronous motor is used, and the star seal technology is adopted to ensure that the elevator keeps low speed running state in the case of abnormal elevator sliding, so as to give passengers the opportunity to escape.

[0003] The traditional star seal technology mainly drives the main machine of the counterweight or the car to rotate when the elevator is in the state of losing control under the condition of empty load uplink or heavy load downlink. The permanent magnet synchronous motor is equivalent to a generator, and its three-phase winding becomes a generator output. At this time, the star seal contactor is in the release state. The normally closed or normally open contact of the star seal contactor short-circuits the three-phase winding output of the motor. The rotor of the motor is subjected to resistance, plays a braking role, makes the elevator run slowly, prevents the elevator from high-speed top or squatting, and plays a safety protection role. However, when the wiring of the star seal contactor is removed or missing, the control system cannot judge its effectiveness, so that the star seal contactor cannot play a safety protection role. SUMMARY

[0004] Therefore, the present application provides a star seal protection device and method, which can solve the problem that the effectiveness of the star seal contactor cannot be judged in the prior art.

[0005] The technical scheme of the present application is as follows:

[0006] A star seal protection device, comprising a frequency converter, a frequency converter control module, a motor three-phase winding, a detection module, a first contactor and a second contactor, the input end of the frequency converter is connected with the frequency converter control module, the output end of the frequency converter is connected with the motor three-phase winding through the normally open contact of the first contactor, realizing the effect of star seal, the normally open contact of the first contactor is connected with the first normally open contact of the second contactor and the second normally open contact of the second contactor respectively, the normally open contact of the second contactor is also connected with the input end of the detection module, the output end of the detection module is connected with the input end of the frequency converter control module, realizing the effect of the effectiveness of the first contactor.

[0007] As a further optional scheme of the star seal protection device, the detection module comprises an input power supply unit and a three-phase voltage balance detection unit, the input power supply unit is connected with the first normally open contact of the second contactor, and the second normally open contact of the second contactor is connected with the three-phase voltage balance detection unit.

[0008] As a further optional solution of the star-enclosing protection device, the first contactor is a star-enclosing contactor.

[0009] As a further optional solution of the star-enclosing protection device, the second contactor is a K contactor.

[0010] A star-enclosing protection method, which applies any one of the above star-enclosing protection devices, specifically comprises:

[0011] When the elevator stops, the first contactor is closed, the detection module drives the second contactor to act, the normally open contact of the second contactor is closed, at this time, voltage is input to the detection unit, when detecting that the three-way voltage is consistent, the star-enclosing loop is normal; when the voltage is unbalanced, a star-enclosing loop abnormal signal is sent to the frequency converter control module, the frequency converter control module generates a locking instruction, and the output of the frequency converter is locked, thereby realizing the effect of star-enclosing protection.

[0012] The beneficial effects of the present application are: by setting the frequency converter control module, the detection module, the first contactor and the second contactor, the first contactor realizes the star-enclosing effect, the second contactor and the detection module detect the working state of the first contactor, which can effectively realize the effect of judging the effectiveness of star-enclosing, and the output of the frequency converter is controlled through the frequency converter control module, thereby realizing the effect of locking the output of the frequency converter, and improving the quality of star-enclosing protection. BRIEF DESCRIPTION OF DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0014] Figure 1 It is a circuit schematic diagram of the prior art star-enclosing protection;

[0015] Figure 2 It is a circuit schematic diagram of a star-enclosing protection device of the present application;

[0016] Figure 3 It is a circuit schematic diagram of a second star-enclosing abnormal condition in a star-enclosing protection device of the present application;

[0017] Figure 4 It is a circuit schematic diagram of a third star-enclosing abnormal condition in a star-enclosing protection device of the present application;

[0018] Figure 5 It is a circuit schematic diagram of a fourth star-enclosing abnormal condition in a star-enclosing protection device of the present application. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0020] Reference Figures 1-5 A star protection device, comprising a frequency converter, a frequency converter control module, a motor three-phase winding, a detection module, a first contactor and a second contactor, the input end of the frequency converter is connected with the frequency converter control module, the output end of the frequency converter is connected with the motor three-phase winding through the normally open contact of the first contactor, the normally open contact of the first contactor is connected with the first normally open contact of the second contactor and the second normally open contact of the second contactor respectively, the normally open contact of the second contactor is also connected with the input end of the detection module, and the output end of the detection module is connected with the input end of the frequency converter control module, so as to realize the effectiveness of the first contactor.

[0021] In the embodiment, by setting the frequency converter control module, the detection module, the first contactor and the second contactor, the first contactor realizes the star protection effect, the second contactor and the detection module detect the working state of the first contactor, the effectiveness of the star protection effect can be effectively realized, the output of the frequency converter is controlled through the frequency converter control module, so as to realize the output blocking effect of the frequency converter and improve the quality of the star protection.

[0022] Preferably, the detection module comprises an input power supply unit and a three-phase voltage balance detection unit, the input power supply unit is connected with the first normally open contact of the second contactor, and the second normally open contact of the second contactor is connected with the three-phase voltage balance detection unit.

[0023] Preferably, the first contactor is a star protection contactor.

[0024] Preferably, the second contactor is a K contactor.

[0025] The specific working principle is as follows:

[0026] When the elevator runs, Y0 does not output, and the K contactor does not act. The main contact and auxiliary contact of the contactor do not act. The contact FX of the star protection contactor is also disconnected;

[0027] When the elevator stops, Y0 outputs, the K contactor is attracted, and the main contact and auxiliary contact of the contactor act.

[0028] The contact FX of the star protection contactor is closed;

[0029] The detection is performed when the elevator is stationary, and there are four specific scenarios:

[0030] First scenario:

[0031] like Figure 2 As shown, when the elevator is stationary, contactor FX actuates, contactor K actuates.

[0032] At this time, V0 = V1 = V2 = V+, the three-phase voltage values ​​are equal, so the star sealing is normal;

[0033] The second scenario:

[0034] like Figure 3 As shown, when the star-sealing contactor contacts are damaged or one phase is missing, V0=V1=V+, V2=R1*V+ / (2R2+R1), at this time V0=V1≠V2, and the star-sealing is judged to be abnormal;

[0035] The third scenario:

[0036] like Figure 4 As shown, when the star-sealing contactor contacts are damaged or two phases are missing, V0 = V+, V0 = V2 = R1 * V+ / (2R2 + R1). At this time, V0 ≠ V1 = V2, and the star-sealing is judged to be abnormal.

[0037] The fourth scenario:

[0038] like Figure 5 As shown, when the star-sealing contactor contacts are damaged or three phases are missing, V0 = V1 = V2 = 0. At this time, V0 = V1 = V2 = 0, and the star-sealing is judged to be abnormal.

[0039] A satellite protection method, wherein the method applies any of the above-mentioned satellite protection devices, specifically including:

[0040] When the elevator stops, the first contactor closes, and the detection module drives the second contactor to operate. The normally open contact of the second contactor closes, and voltage is input to the detection unit. When the three voltages are detected to be consistent, the star-sealing circuit is normal. When the voltage is unbalanced, an abnormal signal of the star-sealing circuit is sent to the inverter control module. The inverter control module generates a blocking command to block the inverter output, thereby achieving the effect of star-sealing protection.

[0041] In this embodiment, by setting up a frequency converter control module, a detection module, a first contactor, and a second contactor, the first contactor achieves the star-blocking effect, and the second contactor and the detection module detect the working status of the first contactor, which can effectively achieve the effect of judging the effectiveness of the star-blocking effect. The frequency converter control module controls the output of the frequency converter, thereby achieving the effect of blocking the output of the frequency converter and improving the quality of the star-blocking protection.

[0042] The above merely provides the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A satellite protection device, characterized in that, The system includes a frequency converter, a frequency converter control module, a three-phase motor winding, a detection module, a first contactor, and a second contactor. The input terminal of the frequency converter is connected to the frequency converter control module, and the output terminal of the frequency converter is connected to the three-phase motor winding through the normally open contact of the first contactor to achieve a star-sealing effect. The normally open contact of the first contactor is connected to the first normally open contact of the second contactor and the second normally open contact of the second contactor. The second normally open contact of the second contactor is also connected to the input terminal of the detection module, and the output terminal of the detection module is connected to the input terminal of the frequency converter control module to ensure the effectiveness of the first contactor.

2. The star-sealing protection device according to claim 1, characterized in that, The detection module includes an input power supply unit and a three-phase voltage balance detection unit. The input power supply unit is connected to the first normally open contact of the second contactor, and the second normally open contact of the second contactor is connected to the three-phase voltage balance detection unit.

3. A star-sealing protection device according to claim 2, characterized in that, The first contactor is a star-sealed contactor.

4. A satellite protection device according to claim 3, characterized in that, The second contactor is a K contactor.

5. A method for protecting satellites, characterized in that, The method employs any one of the satellite protection devices described in claims 1-4, specifically including: When the elevator stops, the first contactor closes, and the detection module drives the second contactor to operate. The normally open contact of the second contactor closes, and voltage is input to the detection unit. When the three voltages are detected to be consistent, the star-sealing circuit is normal. When the voltage is unbalanced, an abnormal signal of the star-sealing circuit is sent to the inverter control module. The inverter control module generates a blocking command to block the inverter output, thereby achieving the effect of star-sealing protection.

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