A three-station mechanism driver control method

Abstract

The present invention relates to a circuit control method, and in particular to a three-station mechanism driver control method, which includes: obtaining the rated current of the motor according to the rated voltage and the rated power of the motor, and obtaining the running stall judgment current and the starting stall judgment current in sequence based on the rated current; when the motor starts to rotate, the stall current is used to judge whether it is stalled according to the starting stall current, and after the motor starts, the stall current is used to judge whether it is stalled according to the running stall current, so as to achieve reliable starting and sensitive stall protection. After the stall occurs, the present invention controls the motor to make the moving contact reverse back half a circle to prevent the mechanical damage of the three-station mechanism caused by the time stall. The present invention can also identify the abnormal position of the three-station mechanism, which is convenient for the three-station mechanism to be in an abnormal position due to power failure during the operation of the three-station mechanism, and can still operate normally when the power is restored again.

Description

Technical Field

[0001] The invention relates to a circuit control method, in particular to a three-station mechanism driver control method. Background Art

[0002] The description in this section merely provides background information related to the present disclosure and does not constitute prior art.

[0003] The three-position switch, also known as the three-position isolating switch, is usually used in power transmission and distribution equipment to improve operational safety. For example, in a direct-acting three-position switch, the moving contact can be driven by the forward and reverse rotation of the motor to pass through the three static contacts and contact each other, allowing the three-position mechanism to flexibly switch between the three states of conduction, disconnection and grounding.

[0004] However, the electrical connection between the moving contact and the three static contacts is generally achieved by the contact of the metal structure. After running for a long time, the lack of lubrication will cause the contacts to become stuck, resulting in excessive pressure between the moving and static contacts, or even complete jamming of the contacts, causing the motor to stall. In some cases, the position signal of the travel switch used to determine the position of the moving contact is abnormal, which can also cause the moving and static contacts to get stuck. If not discovered in time, the three-position switch will be damaged.

[0005] The existing processing method is generally to manually handle when the moving and static contacts are stuck, which requires timely power off, repair, and final reset during the process, increasing the workload of the operating personnel.

[0006] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present invention and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because these solutions are described in the background technology section of the present invention. Summary of the invention

[0007] The purpose of the present invention is to provide a three-station mechanism driver control method, which can solve the effect of stalling by monitoring the startup stall judgment current and the operation stall judgment current and actively reversing the motor.

[0008] In order to achieve the above-mentioned object, the present invention discloses the following three-station mechanism driver control method, which is used to control the moving contact to move between the busbar contact seat, the isolation contact seat and the grounding contact seat, so as to respectively switch the three-station mechanism between the three states of on, off and grounding; the three-station mechanism driver control method comprises:

[0009] Obtaining a rated current of the motor according to a rated voltage of the motor and a rated power of the motor;

[0010] Taking the rated current as a reference, obtaining a running stall judgment current greater than the rated current; taking the running stall judgment current as a reference, obtaining a starting stall judgment current;

[0011] When the motor is started, the driver collects the real-time current of the motor in real time. When the real-time current is greater than the starting stall judgment current, the motor is controlled to reverse, so that the moving contact retreats half a circle from the busbar contact seat, the isolation contact seat or the grounding contact seat;

[0012] When the motor is operating normally, the driver collects the real-time current of the motor in real time. When the real-time current is greater than the running stall judgment current, the motor is controlled to reverse so that the moving contact retreats half a turn from the busbar contact seat, the isolation contact seat or the grounding contact seat.

[0013] As a further description of the above technical solution, the running stall judgment current is greater than the rated current of the motor operation, and the starting stall judgment current is greater than the running stall judgment current.

[0014] As a further description of the above technical solution, the running stall judgment current is set to twice the rated current of the motor operation, and the starting stall judgment current is set to five times the running stall judgment current.

[0015] As a further description of the above technical solution, in the step "When the motor starts, the driver collects the real-time current of the motor in real time, and when the real-time current is greater than the starting jam judgment current, the motor is controlled to reverse so that the moving contact retreats half a turn from the bus contact seat, the isolation contact seat or the grounding contact seat", a starting jam judgment time is provided, and when the real-time current is greater than the starting jam judgment current and remains for more than the starting jam judgment time, the motor is controlled to reverse.

[0016] As a further description of the above technical solution, in the step "When the motor is operating normally, the driver collects the real-time current of the motor in real time, and when the real-time current is greater than the operation jam judgment current, the motor is controlled to reverse so that the moving contact retreats half a turn from the bus contact seat, the isolation contact seat or the grounding contact seat", an operation jam judgment time is provided, and when the real-time current is greater than the operation jam judgment current and remains for more than the operation jam judgment time, the motor is controlled to reverse.

[0017] As a further description of the above technical solution, the startup stall judgment time is the same as the operation stall judgment time.

[0018] As a further description of the above technical solution, a double-pole double-throw relay is used to switch the direction of the winding current of the motor, thereby changing the rotation direction of the motor.

[0019] As a further description of the above technical solution, a single-pole single-throw relay is provided at the positive common end of the forward rotation circuit and the reverse rotation circuit, and an NMOS tube is provided at the negative common end. The driver is signal-connected to the single-pole single-throw relay and the NMOS tube. In the step "when the motor is started, the driver collects the real-time current of the motor in real time, and when the real-time current is greater than the starting stall judgment current, the motor is controlled to reverse so that the moving contact retreats half a circle from the bus contact seat, the isolation contact seat or the grounding contact seat" or the step "when the motor is operating normally, the driver collects the real-time current of the motor in real time, and when the real-time current is greater than the running stall judgment current, the motor is controlled to reverse so that the moving contact retreats half a circle from the bus contact seat, the isolation contact seat or the grounding contact seat", whenever the real-time current of the motor is too large and the motor needs to be reversed, the NMOS tube is closed first, and the single-pole single-throw relay is closed after the motor freewheeling time.

[0020] By means of the above technical solution, the beneficial effects of the present invention are as follows:

[0021] The three-station mechanism driver control method of the present invention can obtain the rated current of the motor running in the circuit through the rated voltage of the power supply and the rated power of the motor, and then set a larger running stall judgment current and a starting stall judgment current in sequence based on the rated current of the motor running in the circuit. By monitoring the starting stall judgment current and the running stall judgment current, the motor is reversed to achieve release from the stall. Compared with the existing method that requires manual intervention for regulation, the present invention significantly improves efficiency and reduces labor costs.

[0022] To further understand the features and technical contents of the present invention, please refer to the following detailed description and drawings of the present invention. However, the drawings provided are only for reference and description and are not intended to limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0024] Figure 1It is a circuit diagram of a three-station mechanism driver control method provided in an embodiment of this specification;

[0025] Figure 2 It is a schematic diagram of a three-station mechanism of a three-station mechanism driver control method provided in an embodiment of this specification;

[0026] Figure 3 It is a schematic diagram of the isolation closing or grounding opening process of a three-station mechanism driver control method provided in an embodiment of this specification;

[0027] Figure 4 It is a schematic diagram of the isolation opening or grounding closing process of a three-station mechanism driver control method provided in an embodiment of this specification;

[0028] In the figure: 100, moving contact; 200, busbar contact seat; 300, isolation contact seat; 400, grounding contact seat; 1, circuit; 11, forward circuit; 12, reverse circuit; 2, motor; 3, power supply; 4, double-pole double-throw relay; 5, single-pole single-throw relay; 6, NMOS tube. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this specification, not all of the embodiments. Based on the embodiments in this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this specification.

[0030] The following is an explanation of the embodiments of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and the details in this specification can also be modified and changed in various ways based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only simple schematic illustrations and are not depicted according to actual sizes. It is stated in advance. The following embodiments will further explain the relevant technical contents of the present invention in detail, but the disclosed contents are not intended to limit the scope of protection of the present invention.

[0031] It should be understood that, although the terms "first", "second", "third", etc. may be used herein to describe various components or signals, these components or signals should not be limited by these terms. These terms are mainly used to distinguish one component from another component, or one signal from another signal. In addition, the term "or" used herein may include any one or more combinations of the associated listed items depending on the actual situation.

[0032] See also Figure 1-4 , is a three-station mechanism driver control method of this embodiment, which is used to control the three-station mechanism, the three-station mechanism includes a circuit and a motor 2 connected in series in the circuit 1, both ends of the circuit 1 are connected to the power supply 3, the output end of the motor 2 is connected to the moving contact 100, and the motor 2 is used to control the moving contact 100 to move between the busbar contact seat 200, the isolation contact seat 300 and the grounding contact seat 400, so as to respectively switch the three-station mechanism between the three states of conduction, disconnection and grounding; wherein the three-station mechanism driver control method includes:

[0033] According to the rated voltage of the motor 2 and the rated power of the motor 2, the rated current of the motor 2 is obtained;

[0034] Taking the rated current as a reference, a running stall judgment current greater than the rated current is obtained; taking the running stall judgment current as a reference, a starting stall judgment current is obtained;

[0035] When the motor 2 is started, the driver collects the real-time current of the motor 2 in real time. When the real-time current is greater than the starting stall judgment current, the motor 2 is controlled to reverse, so that the moving contact 100 retreats half a circle from the busbar contact seat 200, the isolation contact seat 300 or the grounding contact seat 400;

[0036] When motor 2 is operating normally, the driver collects the real-time current of motor 2 in real time. When the real-time current is greater than the running stall judgment current, motor 2 is controlled to reverse, so that the moving contact 100 retreats half a turn from the busbar contact seat 200, the isolation contact seat 300 or the grounding contact seat 400.

[0037] During the above-mentioned use, before the motor 2 is started, the moving contact 100 at the output end of the motor 2 may actually have been stuck at any position between the bus contact seat 200, the isolation contact seat 300 and the grounding contact seat 400. At this time, if the motor 2 is started, it will inevitably be stuck, which may cause the real-time current monitored by the circuit 1 to abnormally increase by several times. Therefore, according to the above-mentioned calculated starting stall judgment current, the real-time current of the motor 2 is timely compared with the starting stall judgment current during the starting phase. If the real-time current of the motor 2 is continuously greater than the starting stall judgment current under certain conditions, it can be determined that the motor 2 is in an abnormal stall state where the moving contact 100 is blocked. At this time, the motor 2 is controlled to reverse and the moving contact 100 is quickly disengaged from the stuck state, so that the motor 2 can be disengaged from the abnormal stall state where the moving contact 100 is blocked, so as to facilitate the next step of operation. Similarly, during the normal operation of the motor 2, the moving contact 100 at the output end of the motor 2 may be suddenly stuck at any position between the bus contact seat 200, the isolation contact seat 300 and the grounding contact seat 400 at any time, causing the moving contact 100 to encounter abnormal resistance, or even the moving contact 100 to completely stop moving. In this embodiment, the real-time current of the motor 2 is timely compared with the running jam judgment current at any stage of the operation according to the above-mentioned calculated running jam judgment current. If the real-time current of the motor 2 is continuously greater than the running jam judgment current under certain conditions, it can be determined that the motor 2 is in an abnormal jam state where the moving contact 100 is blocked. At this time, the motor 2 is controlled to reverse and the moving contact 100 is quickly retreated half a circle from the stuck state, so that the motor 2 can be released from the abnormal jam state where the moving contact 100 is blocked, so as to facilitate the next step of operation. Specifically, the driver includes a Hall element, and the Hall element is arranged on the main circuit of the circuit 1, such as Figure 1 The A-shaped mark on the right side is used to monitor the current of the motor 2 in real time.

[0038] Through the above method, the stall state of motor 2 can be monitored by the driver itself through monitoring of the three-station mechanism, and the stall state can be quickly released through the reversal of motor 2. Compared with the existing situation where manual monitoring of possible stalls is required at any time and manual intervention is required to deal with the stalls, the operating efficiency of the three-station mechanism is improved, which is more accurate and sensitive than manual operation and saves labor costs.

[0039] The following is an embodiment of eliminating and correcting the stalling of the motor 2 by means of the method of the present invention.

[0040] Example 1 is the process of driving mechanism controlling isolation closing or grounding opening. For details, please refer to Figure 1 and Figure 3 ,in,

[0041] According to the rated power P of motor 2 M and rated voltage U M Calculate its rated current I M , where I M =P M ÷U M ;

[0042] Set the motor running stall judgment current I RB , where I RB =2×I M ;

[0043] Set the motor start-up stall judgment current I SB , where I SB =5×I RB ;

[0044] After receiving the command, the timing starts at t;

[0045] Set the motor start time to T S ;

[0046] Set the stall judgment time to T B ;

[0047] Set the actual stall time to t B ;

[0048] Set the motor freewheeling time to T FC ;

[0049] Set the stall back-off time to T R ;

[0050] Set the operation timeout to T T ;

[0051] Set the collected motor current I SM ;

[0052] Double-pole double-throw relay 4 is RLY1;

[0053] SPST relay 5 is RLY2;

[0054] NMOS tube 6 is Q1;

[0055] When the driver receives the isolation closing or grounding opening command, RLY2 is closed first, then Q1 is turned on, the forward circuit 11 is turned on, and the motor 2 starts to run forward. The front T of the motor 2 forward rotation S The internal locked-rotor current is I SB Make a judgment, that is, when the motor 2 starts to run T S If the motor current I is detected SM Greater than I SB Duration t BMore than T B , the driver is controlled to shut down Q1 and output a stall alarm signal. FC Then disconnect RLY2;

[0056] Motor 2 rotates forward for more than T S After the time, the stall current is I RB Make a judgment, if I SM Greater than I RB Duration t B More than T B , then Q1 is turned off and a stall alarm signal is output. FC After time T, close RLY1, turn on Q1, and R Time to turn off Q1, by T FC After the time, disconnect RLY1 and RLY2;

[0057] If motor 2 rotates forward for more than T S After the travel switch is detected, Q1 is turned off. FC After that, disconnect RLY2; if motor 2 rotates forward for more than T T If the limit switch is not detected, the output operation timeout signal is turned off, Q1 is turned off, and after T FC Then disconnect RLY2.

[0058] Example 2 is the process of driving mechanism controlling isolation opening or grounding closing. For details, please refer to Figure 1 and Figure 4 ,in,

[0059] When the driver receives the isolation opening or grounding closing command, RLY1 and RLY2 are closed first, then Q1 is turned on, the reversing circuit 12 is turned on, and the motor 2 starts to reverse. S The internal locked-rotor current is I SB Make a judgment, that is, when the motor 2 starts to run T S If the motor current I is detected SM Greater than I SB Duration t B More than T B , the driver is controlled to shut down Q1 and output a stall alarm signal. FC Then disconnect relays RLY1 and RLY2;

[0060] Motor 2 reverses for more than T S After the time, the stall current is I RB Make a judgment, if I SM Greater than I RB Duration t B More than T B, then Q1 is turned off and a stall alarm signal is output. FC After time T, RLY1 is disconnected and Q1 is turned on. R Time to turn off Q1, by T FC After the time, disconnect RLY2;

[0061] If the motor 2 reverses for more than T S After the travel switch is detected, Q1 is turned off. FC After that, disconnect RLY1 and RLY2; if the motor 2 reverses for more than T T If the limit switch is not detected, the output operation timeout signal is turned off, Q1 is turned off, and after T FC Then disconnect RLY1 and RLY2.

[0062] Specifically, in the above-mentioned Embodiment 1 and Embodiment 2, the travel switch is arranged in the three-position mechanism for monitoring the specific position and travel information of the moving contact 100, and serves as a physical judgment of the driving mechanism controlling the circuit 1.

[0063] Motor running stall judgment current I RB Set to rated current I M Twice the motor start stall judgment current I SB Set to the motor running stall judgment current I RB The reason for the five times of the above is that in the initial running stall scenario, the moving contact 100 is generally stuck more deeply, and the moving contact 100 lacks inertia, and needs a larger kinetic energy provided by the motor 2 to overcome the resistance. Of course, in some other embodiments, it is actually necessary to make fine adjustments within the above range, and still achieve a better effect of releasing the stall.

[0064] Similarly, the stall judgment time T B It can be adjusted according to the actual mechanical maintenance status of the three-position switch or the degree of possible resistance. For example, in the case of a large mechanical structure, large inertia or resistance, the stall judgment time T can be appropriately lengthened. B To avoid misjudgment, when the friction of the materials at the contact points between the moving contact 100 and the multiple stationary contacts of the mechanical structure are similar, the stall judgment time and the start stall judgment time are set to the same T B , easy to monitor.

[0065] Q1 of the NMOS tube 6 is set as an NMOS field effect tube electrically connected to the driving mechanism. In the above-mentioned embodiments 1 and 2, by controlling the start and stop of Q1, it can be ensured that the surge current of the circuit 1 is reduced before the double-pole double-throw relay 4 or the single-pole single-throw relay 5 is switched, thereby protecting the contacts and other circuit elements of the double-pole double-throw relay 4 and the single-pole single-throw relay 5, and extending the service life of the circuit 1.

[0066] The contents disclosed above are only preferred feasible embodiments of the present invention, and are not intended to limit the scope of the present invention. Therefore, all equivalent technical changes made using the contents of the present invention's specification and drawings are included in the scope of the present invention.

[0067] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0068] Although the present application has been described through embodiments, those skilled in the art will appreciate that there are many modifications and changes to the present application without departing from the spirit of the present application. It is intended that the attached embodiments include these modifications and changes without departing from the present application.

Claims

1. A three-position mechanism driver control method for controlling a moving contact to move between a busbar contact seat, an isolation contact seat and a grounding contact seat, so as to switch the three-position mechanism between the three states of on, off and grounding, characterized in that: The three-station mechanism driver control method comprises: Obtaining a rated current of the motor according to a rated voltage of the motor and a rated power of the motor; Taking the rated current as a reference, obtaining a running stall judgment current greater than the rated current; taking the running stall judgment current as a reference, obtaining a starting stall judgment current; When the motor is started, the driver collects the real-time current of the motor in real time. When the real-time current is greater than the starting stall judgment current, the motor is controlled to reverse, so that the moving contact retreats half a circle from the busbar contact seat, the isolation contact seat or the grounding contact seat; When the motor is operating normally, the driver collects the real-time current of the motor in real time. When the real-time current is greater than the running stall judgment current, the motor is controlled to reverse so that the moving contact retreats half a turn from the busbar contact seat, the isolation contact seat or the grounding contact seat.

2. The three-station mechanism driver control method according to claim 1, characterized in that: The running stall judgment current is greater than the rated current of the motor operation, and the starting stall judgment current is greater than the running stall judgment current.

3. The three-station mechanism driver control method according to claim 1, characterized in that: The running stall judgment current is set to twice the rated current of the motor, and the starting stall judgment current is set to five times the running stall judgment current.

4. The three-station mechanism driver control method according to claim 1, characterized in that: In the step "When the motor starts, the driver collects the real-time current of the motor in real time. When the real-time current is greater than the starting jam judgment current, the motor is controlled to reverse so that the moving contact retreats half a circle from the bus contact seat, the isolation contact seat or the grounding contact seat", a starting jam judgment time is provided. When the real-time current is greater than the starting jam judgment current and remains for more than the starting jam judgment time, the motor is controlled to reverse.

5. The three-station mechanism driver control method according to claim 4, characterized in that: In the step "When the motor is running normally, the driver collects the real-time current of the motor in real time, and when the real-time current is greater than the operation jam judgment current, the motor is controlled to reverse so that the moving contact retreats half a circle from the bus contact seat, the isolation contact seat or the grounding contact seat", an operation jam judgment time is provided. When the real-time current is greater than the operation jam judgment current and remains for more than the operation jam judgment time, the motor is controlled to reverse.

6. The three-station mechanism driver control method according to claim 5, characterized in that: The startup stall judgment time is the same as the operation stall judgment time.

7. The three-station mechanism driver control method according to claim 1, characterized in that: The direction of the motor winding current is switched by a double-pole double-throw relay, thereby changing the rotation direction of the motor.

8. The three-station mechanism driver control method according to claim 7, characterized in that: A single-pole single-throw relay is provided at the positive common end of the forward rotation circuit and the reverse rotation circuit, and an NMOS tube is provided at the negative common end. The driver is signal-connected to the single-pole single-throw relay and the NMOS tube. In the step "when the motor is started, the driver collects the real-time current of the motor in real time, and when the real-time current is greater than the starting stall judgment current, the motor is controlled to reverse, so that the moving contact retreats half a circle from the bus contact seat, the isolation contact seat or the grounding contact seat" or the step "when the motor is running normally, the driver collects the real-time current of the motor in real time, and when the real-time current is greater than the running stall judgment current, the motor is controlled to reverse, so that the moving contact retreats half a circle from the bus contact seat, the isolation contact seat or the grounding contact seat", whenever the real-time current of the motor is too large and the motor needs to be reversed, the NMOS tube is closed first, and the single-pole single-throw relay is closed after the motor freewheeling time.

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