Automatic rotation control system and control method for multiple motors

Abstract

The present invention discloses an automatic rotation control system and a control method for multiple motors, which relate to the field of motor control. The control system includes a central controller, an acquisition module, a counter, a remote control terminal and a first pulse trigger. The control method includes S1, which sequentially numbers the motors, sets the maximum value of the counter, the number of motors running simultaneously and a threshold value for the working time; S2, which acquires the working status and working time of the motors; S3, which determines whether the number of running motors n is less than m; S4, which counts once; S5, which transmits the counting result a to the central controller, and starts the motor numbered a; S6, which enters S3 when n=n+1; and the control system of the present invention is combined with the control method to accurately control the start and stop of multiple motors, thereby simplifying the control principle, improving the system's ability to cope with abnormal conditions, effectively ensuring the safe and stable operation of equipment in the power station, and avoiding an increase in the probability of control defects due to an increase in the amount of programs in the system.

Description

Technical Field

[0001] The present invention relates to the field of motor control, and in particular to an automatic rotation control system and a control method for multiple motors. Background Art

[0002] A generator is a mechanical device that converts other forms of energy into electricity. Driven by a turbine, steam turbine, diesel engine, or other power machinery, it converts energy generated by water flow, air flow, fuel combustion, or nuclear fission into mechanical energy, which is then transmitted to the generator, where it is then converted into electrical energy. Generators are widely used in industrial and agricultural production, national defense, science and technology, and daily life. In automatic control systems for auxiliary equipment in generators, two or three motors are most commonly used in rotational operation. In a two-motor automatic control system, the first motor is generally designated as the primary motor, and the second as the backup motor. When the rotation conditions are met, the second motor becomes the primary motor and the first as the backup motor. Starting is determined by the control conditions: if one motor needs to be started, the primary motor is activated; if two motors need to be started, the backup motor is activated. In a three-motor automatic control system, the first motor is generally designated as the primary motor, the second as the primary backup motor, and the third as the secondary backup motor. When the rotation conditions are met, the other two motors are set as the main motor, the third motor as the first backup motor, and the first motor as the second backup motor. The start-up is based on the control conditions: if one motor needs to be started, the main motor is started; if two motors need to be started, the first backup motor is started; if three motors need to be started, the second backup motor is started. Although the above control method has been widely and maturely applied in the oil, water, and gas systems of hydropower stations, when the number of motors to be controlled continues to increase, such as to 4 or even 10, continuing to use the above automatic rotation method will require the compilation of a large number of programs (the amount of programming required basically doubles for each additional motor). The increase in the number of programs will also lead to an increase in the probability of control defects, affecting the system's ability to respond to abnormal conditions and affecting the safe and stable operation of the equipment. Summary of the Invention

[0003] The purpose of the present invention is to design an automatic rotation control system and control method for multiple motors in order to solve the above problems.

[0004] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0005] An automatic rotation control system for multiple motors includes a central controller for controlling the start and stop of each motor, multiple acquisition modules, counters, a remote control terminal and a first pulse trigger. One acquisition module is used to collect relevant information of one motor. The signal output end of each acquisition module is connected to the signal input end of the central controller, the signal end of the counter is connected to the signal end of the central controller, the control signal output end of the first pulse trigger is connected to the control signal input end of the counter, the control signal output end of the central controller is respectively connected to the control signal input end of each motor and the control signal input end of the first pulse trigger, the signal end of the remote control terminal is connected to the signal end of the central controller, and the first pulse trigger is set with a time interval t. When sending pulses continuously, the next pulse will not be sent until the interval time t of the previous pulse.

[0006] The automatic rotation control method for multiple motors is applied to the automatic rotation control system for multiple motors described above, and includes the following steps:

[0007] S1. Sequentially number multiple motors 1, 2, 3...x, set the maximum value of the counter to x+1, set the number of motors running simultaneously m, and the motor working time threshold;

[0008] S2, the acquisition module collects the working status of each motor and the working time of each motor in the working state in real time;

[0009] S3, determine whether the number n of motors currently running is less than the number m of motors set to run simultaneously. If so, control the first pulse trigger to send a pulse to the counter and enter S4. If not, return to S2;

[0010] S4, the counter counts once to a+1, where a is the cumulative count result of the previous time;

[0011] S5, let a=a+1, transmit the current counting result a to the central controller, and the central controller controls the motor numbered a to start;

[0012] S6. Set n=n+1 and go to S3.

[0013] The beneficial effects of the present invention are as follows: a pulse signal is sent to the counter through the first pulse trigger to accumulate the count once, and the current count result of the counter is sent to the central controller, and the central controller then controls the motor with the corresponding number to start and enter the working state. When the counter reaches the maximum number of the motor, the counter is reset to zero and automatically adds 1, and starts counting from 1 again; when the motor in the working state reaches a pre-set time threshold, the central controller controls the corresponding motor to enter the stop state, and this cycle can realize the start and stop control of multiple motors. Accurate control of multiple motors can be achieved by accumulating counts in the counter, which reduces the difficulty of controlling the start and stop of multiple motors, effectively avoiding the limitation of the number of motor configurations due to the difficulty in controlling multiple motors, or the omission of control of too many motors, which makes the control system have hidden dangers; the control method of the present invention can accurately control the start and stop of multiple motors, simplify the control principle, improve the ability of the system to cope with abnormal conditions, effectively ensure the safe and stable operation of the equipment in the power station, and avoid the increase in the probability of control defects due to the increase in the amount of programs in the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the automatic rotation control system of multiple motors of the present invention;

[0015] Figure 2 It is a flow chart of the automatic rotation control method of multiple motors of the present invention. DETAILED DESCRIPTION

[0016] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the embodiments of the present invention. It should be understood that the described embodiments are only a portion of the embodiments of the present invention, not all of them. Generally, the components of the embodiments of the present invention described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations.

[0017] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0018] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0019] In the description of the present invention, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] Furthermore, the terms “first”, “second”, etc. are merely used for distinguishing descriptions and should not be understood as indicating or implying relative importance.

[0021] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, terms such as "disposed" and "connected" should be understood in a broad sense. For example, "connected" can mean a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also mean internal communication between two components. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0022] The specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] like Figure 1 As shown, an automatic rotation control system for multiple motors includes a central controller for controlling the start and stop of each motor, multiple acquisition modules, counters, a remote control terminal and a first pulse trigger. One acquisition module is used to collect relevant information of one motor, and the central controller is used to control the start and stop of the motor and the first pulse trigger. The signal output end of each acquisition module is connected to the signal input end of the central controller, the signal end of the counter is connected to the signal end of the central controller, the control signal output end of the first pulse trigger is connected to the control signal input end of the counter, the control signal output end of the central controller is respectively connected to the control signal input end of each motor and the control signal input end of the first pulse trigger, the signal end of the remote control terminal is connected to the signal end of the central controller, and the first pulse trigger is set with a time interval t. When sending pulses continuously, the next pulse will not be sent until the interval time t of the previous pulse.

[0024] Each acquisition module includes a status acquisition module for acquiring the working status of the motor and a duration acquisition module for acquiring the working duration of the motor. The data signal output end of the duration acquisition module and the data signal output end of the status acquisition module are both connected to the data signal input end of the central controller.

[0025] The automatic rotation control system also includes a second pulse trigger, the control signal output end of the second pulse trigger is connected to the control signal input end of the counter, and the control signal output end of the central controller is connected to the control signal input end of the second pulse trigger. When the central controller detects that the controlled motor should start and enter the working state but fails to start due to a fault, the central controller controls the second pulse trigger to send a pulse to the counter, causing the counter to count once, and sends the counting result to the central controller to control the start of the next motor.

[0026] The number of motors that need to run simultaneously and the threshold for their operating hours are set via a remote control terminal. The central controller then controls the activation of a first pulse trigger, which sends a pulse to a counter, causing the counter to accumulate a count and transmit the accumulated result to the central controller. The central controller then controls the corresponding motor to start and enter the working state. When the motor enters the working state, it begins to collect the working status and operating hours of the motor and transmits the collected working status and operating hours to the central controller. When the operating hours of the motor reach the set threshold, the central controller controls the motor to stop working. When the number of motors collected in the working state reaches the set number of motors running, the central controller controls the first pulse trigger to stop working. When the accumulated count of the counter reaches the total number of controlled motors plus 1, the central controller controls the counter to reset to zero and automatically increment by 1 to start a new round of control, achieving the purpose of cyclically controlling the start and stop of multiple motors. Accumulating counts in the counter allows for precise control of multiple motors, reducing the difficulty of controlling the start and stop of multiple motors and effectively avoiding the problem of limiting the number of motors configured due to the difficulty of controlling multiple motors, or omissions in the control of too many motors, which may pose a hidden danger to the control system.

[0027] like Figure 2 As shown, the automatic rotation control method of multiple motors is characterized by comprising the following steps:

[0028] S1. Sequentially number multiple motors 1, 2, 3...x, set the maximum value of the counter to x+1, set the number of motors running simultaneously m and the motor working time threshold.

[0029] S2. The acquisition module acquires the working status of each motor and the working time of each motor in the working state in real time.

[0030] S3. Determine whether the number n of motors currently running is less than the set number m of motors running simultaneously. If so, control the first pulse trigger to send a pulse to the counter and enter S4. If not, return to S2. The first pulse trigger is set with a time interval t. Every time interval t, the first pulse trigger sends a pulse signal to the counter.

[0031] S4. The counter counts once to a+1, where a is the last cumulative counting result. If the last cumulative counting result a is less than x, then directly enter S5; if the last cumulative counting result a is equal to x, then the counter is reset to zero so that a=0, and then enter S5.

[0032] S5. Let a=a+1, and transmit the current counting result a to the central controller. The central controller controls the motor numbered a to start. If the motor numbered a starts normally, enter S6; if the motor numbered a fails to start, the central controller controls the second pulse trigger to send a pulse to the counter and enter S4.

[0033] S6. Set n=n+1 and go to S3.

[0034] S7. When the working time of a motor reaches the working time threshold or the motor fails, the motor stops running, and n=n-1 is set, and then enters S3.

[0035] The control method of the present invention can accurately control the start and stop of multiple motors, simplify the control principle, improve the system's ability to cope with abnormal conditions, effectively ensure the safe and stable operation of equipment in the power station, and avoid the increase in the probability of control defects caused by the increase in the amount of program in the system.

[0036] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. Any technical variations made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. A method for automatically rotating multiple motors, characterized in that: The following steps are involved: S1. Sequentially number multiple motors 1, 2, 3...x, set the maximum value of the counter to x+1, set the number of motors running simultaneously m, and the motor working time threshold; S2, the acquisition module collects the working status of each motor and the working time of each motor in the working state in real time; S3, determine whether the number n of motors currently running is less than the number m of motors set to run simultaneously. If so, control the first pulse trigger to send a pulse to the counter and enter S4. If not, return to S2; S4, the counter counts once to a+1, where a is the last cumulative count result; if a is less than x, go directly to S5; if the last cumulative count result a is equal to x, the counter is reset to zero and a=0, then go to S5; S5. Let a = a + 1, and transmit the current count result a to the central controller. The central controller controls the motor numbered a to start. If the motor numbered a fails to start, the central controller controls the second pulse trigger to send a pulse to the counter and enters S4. S6. Set n=n+1 and go to S3.

2. The automatic rotation control method of multiple motors according to claim 1, characterized in that: After S6, the process also includes S7. When the working time of a motor reaches a working time threshold or the motor fails, the motor stops running, then n=n-1, and then enters S3.

3. An automatic rotation control system for multiple motors, used to implement the automatic rotation control method for multiple motors according to any one of claims 1 to 2, characterized in that: It includes a central controller for controlling the start and stop of each motor, multiple acquisition modules, a counter, a remote control terminal and a first pulse trigger. One acquisition module is used to collect relevant information of a motor. The signal output end of each acquisition module is connected to the signal input end of the central controller, the signal end of the counter is connected to the signal end of the central controller, the control signal output end of the first pulse trigger is connected to the control signal input end of the counter, the control signal output end of the central controller is respectively connected to the control signal input end of each motor and the control signal input end of the first pulse trigger, the signal end of the remote control terminal is connected to the signal end of the central controller, the first pulse trigger is set with a time interval t, and when pulses are sent continuously, the next pulse will not be sent until the interval time t of the previous pulse; the automatic rotation control system also includes a second pulse trigger, the control signal output end of the second pulse trigger is connected to the control signal input end of the counter, and the control signal output end of the central controller is connected to the control signal input end of the second pulse trigger.

4. The automatic rotation control system for multiple motors according to claim 3, characterized in that: Each acquisition module includes a status acquisition module for acquiring the working status of the motor and a duration acquisition module for acquiring the working duration of the motor. The data signal output end of the duration acquisition module and the data signal output end of the status acquisition module are both connected to the data signal input end of the central controller.

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