CN112653356A - Control method and system for self-starting synchronous motor, storage medium and processor - Google Patents
Control method and system for self-starting synchronous motor, storage medium and processor Download PDFInfo
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Abstract
The invention discloses a control method and a control system for a self-starting synchronous motor, a storage medium and a processor. Wherein, the method comprises the following steps: collecting the running current of the self-starting synchronous motor after the self-starting synchronous motor is started to a synchronous speed; determining whether the self-starting synchronous motor operates in a target state or not according to the operating current, wherein when the self-starting synchronous motor operates in the target state, the operating efficiency is highest under the current load; and under the condition that the self-starting synchronous motor is not operated in the target state, adjusting the operation voltage of the self-starting synchronous motor so as to enable the self-starting synchronous motor to be operated in the target state. The invention solves the technical problem that the self-starting synchronous motor is difficult to reach the optimal efficiency point due to the constant-voltage operation under different loads.
Description
Technical Field
The invention relates to the technical field of self-starting synchronous motor control, in particular to a control method and system of a self-starting synchronous motor, a storage medium and a processor.
Background
The self-starting synchronous motor combines the advantages of an asynchronous motor on the basis of the synchronous motor, and realizes self-starting through asynchronous torque generated by a guide bar. Compared with a synchronous motor, the starting process of the self-starting synchronous motor does not need to be controlled by a complex frequency converter; compared with an asynchronous motor, the self-starting synchronous motor has the advantages of small rotor loss and high motor efficiency under the constant-speed operation. In the prior art, the self-starting synchronous motor is connected with a constant-frequency constant-amplitude voltage source for starting and running, the running voltage of the motor is the same and cannot be adjusted under different loads, the motor can not run at the optimal efficiency point under different loads, and the efficiency improvement of the self-starting synchronous motor is limited.
Aiming at the problem that the self-starting synchronous motor in the prior art is difficult to achieve the optimal efficiency point due to the fact that the self-starting synchronous motor runs under different loads at constant voltage, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a control method and system of a self-starting synchronous motor, a storage medium and a processor, which are used for at least solving the technical problem that the self-starting synchronous motor in the prior art is difficult to achieve the optimal efficiency point due to constant-voltage operation under different loads.
According to an aspect of an embodiment of the present invention, there is provided a control method of a self-starting synchronous motor, including: collecting the running current of the self-starting synchronous motor after the self-starting synchronous motor is started to a synchronous speed; determining whether the self-starting synchronous motor operates in a target state or not according to the operating current, wherein when the self-starting synchronous motor operates in the target state, the operating efficiency is highest under the current load; and under the condition that the self-starting synchronous motor is not operated in the target state, adjusting the operation voltage of the self-starting synchronous motor so as to enable the self-starting synchronous motor to be operated in the target state.
Further, after determining whether the self-starting synchronous motor is operated in the target state according to the operation current, the method further includes: in the case where the self-starting synchronous machine has been operated in the target state, the current operating voltage is kept in use.
Further, after determining whether the self-starting synchronous motor is operated in the target state according to the operation current, the method further includes: in the case where the self-starting synchronous motor has been operated in the target state, the adjustment of the operating voltage of the self-starting synchronous motor is stopped.
Further, before collecting the operating current of the self-starting synchronous motor, the method further comprises: detecting whether the load of the self-starting synchronous motor changes; and under the condition that the load of the self-starting synchronous motor changes, the step of collecting the running current of the self-starting synchronous motor is carried out.
Further, before collecting the operating current of the self-starting synchronous motor, the method further comprises: and if the running load of the self-starting synchronous motor is the same as the starting load of the self-starting synchronous motor, after the self-starting synchronous motor is started, the step of collecting the running current of the self-starting synchronous motor is carried out.
Further, the step of collecting the operating current of the self-starting synchronous motor includes: collecting the running current of the self-starting synchronous motor according to a preset sampling frequency, and determining whether the self-starting synchronous motor runs in a target state according to the running current, wherein the method comprises the following steps: determining whether the running current reaches the minimum current of the self-starting synchronous motor under the current load; if the running current does not reach the minimum current of the self-starting synchronous motor under the current load, determining that the self-starting synchronous motor does not run in the target state; if the operating current has reached a minimum current of the self-starting synchronous machine under the present load, it is determined that the self-starting synchronous machine has operated in the target state.
Further, when the load of the self-starting synchronous motor changes, adjusting the operating voltage of the self-starting synchronous motor to make the self-starting synchronous motor operate in a target state comprises: if the load is increased, increasing the operating voltage according to a first preset step; if the load decreases, the operating voltage is decreased by a second predetermined step.
Further, in a case where a starting load and an operating load of the self-starting synchronous motor are the same, adjusting an operating voltage of the self-starting synchronous motor to operate the self-starting synchronous motor in a target state includes: the operating voltage is increased or decreased at a third preset step to bring the operating current to the minimum current of the self-starting synchronous motor at the present load.
According to another aspect of the embodiments of the present invention, there is also provided a control system of a self-starting synchronous motor, including: comprises a self-starting synchronous motor; the current detection device is used for collecting the running current of the self-starting synchronous motor after the self-starting synchronous motor is started to a synchronous speed; determining whether the self-starting synchronous motor operates in a target state according to the operating current; when the self-starting synchronous motor operates in a target state, the operation efficiency is highest under the current load; and the voltage adjusting device is connected with the current detecting device and used for adjusting the running voltage of the self-starting synchronous motor under the condition that the self-starting synchronous motor is not operated in the target state so as to enable the self-starting synchronous motor to be operated in the target state.
Further, the above system further comprises: a load giving module in communication with the self-starting synchronous machine for serving as a load for the self-starting synchronous machine; and the controllable switch is arranged between the current detection device and the voltage regulation device and is used for being switched off when the self-starting synchronous motor is operated in a target state and being switched on when the load of the self-starting synchronous motor is changed.
According to another aspect of the embodiments of the present invention, there is also provided a storage medium including a stored program, wherein the control method of the self-starting synchronous motor is executed by controlling a device in which the storage medium is located when the program is executed.
According to another aspect of the embodiments of the present invention, there is also provided a processor for executing a program, wherein the program executes the control method of the self-starting synchronous motor.
In the embodiment of the invention, the self-starting synchronous motor can run under the voltage value corresponding to the minimum current by adjusting the amplitude of the voltage of the input end of the self-starting synchronous motor, the control of the running state with the optimal efficiency of the self-starting synchronous motor under different loads is realized, and the problem that the self-starting synchronous motor is difficult to reach the optimal efficiency point due to the constant voltage running under different loads is solved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a flowchart of a control method of a self-starting synchronous motor according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an alternative control system for a self-starting synchronous machine according to an embodiment of the present invention;
FIG. 3 is a flow chart of an alternative method of controlling a self-starting synchronous machine according to an embodiment of the present invention;
FIG. 4 is a flow chart of control logic for regulating the operating voltage of the self-starting synchronous machine based on the current value detected by the current detection device;
FIG. 5 is a graph of current-voltage and efficiency-voltage relationships obtained using the control method of the self-starting synchronous machine of the present invention;
fig. 6 is a schematic diagram of a control system for a self-starting synchronous machine according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
In accordance with an embodiment of the present invention, there is provided an embodiment of a method for controlling a self-starting synchronous machine, wherein the steps illustrated in the flowchart of the figure may be performed in a computer system, such as a set of computer-executable instructions, and wherein, although a logical order is illustrated in the flowchart, in some cases, the steps illustrated or described may be performed in an order different than that illustrated herein.
Fig. 1 is a control method of a self-starting synchronous motor according to an embodiment of the present invention, as shown in fig. 1, the method including the steps of:
step S101, collecting the running current of the self-starting synchronous motor after the self-starting synchronous motor is started to a synchronous speed;
step S102, determining whether the self-starting synchronous motor operates in a target state or not according to the operating current, wherein when the self-starting synchronous motor operates in the target state, the operating efficiency is highest under the current load;
and step S103, under the condition that the self-starting synchronous motor is not operated in the target state, adjusting the operation voltage of the self-starting synchronous motor so as to enable the self-starting synchronous motor to be operated in the target state.
The self-starting synchronous motor has self-starting capability, and comprises but is not limited to a self-starting permanent magnet synchronous motor, a self-starting permanent magnet auxiliary synchronous reluctance motor, a self-starting synchronous reluctance motor and other motors which are synchronously operated by realizing self-starting through asynchronous torque.
The collecting of the running current of the self-starting synchronous motor can be realized by a current detection device connected with the self-starting synchronous motor, and the adjusting of the running voltage of the self-starting synchronous motor can be realized by a voltage adjusting device connected with the self-starting synchronous motor.
The start-to-synchronous speed of the self-starting synchronous motor means that the self-starting synchronous motor has been successfully self-started and operates at a rated rotation speed (i.e., synchronous speed). The method for judging the starting speed of the self-starting synchronous motor to the synchronous speed comprises the following steps: the rotation speed of the self-starting synchronous motor enters the synchronous speed and fluctuates within a certain range within a certain time, and the range can be determined according to the actual operation environment and the size of the starting load of the self-starting synchronous motor, so that the successful starting of the self-starting synchronous motor is ensured. The detection of the rotation speed fluctuation range can be realized by adding a rotation speed detection module in a voltage control system (which can be a power supply or a voltage adjusting device of the input voltage of the self-starting synchronous motor) of the self-starting synchronous motor or by adopting independent rotation speed detection equipment such as a tachometer and the like.
The target state in step S102 may be an optimal efficiency point at which the self-starting synchronous motor operates under the current load. Judging whether the self-starting synchronous motor operates in a target state according to the operation current value of the self-starting synchronous motor, which specifically comprises the following steps: if the running current of the self-starting synchronous motor is the minimum value of the running current under the current load, judging that the self-starting synchronous motor reaches the optimal efficiency point under the current load, and at the moment, the self-starting synchronous motor runs in a target state without adjusting the input voltage; if the running current of the self-starting synchronous motor is not the minimum value of the running current under the current load, the step S103 is entered to adjust the input amplitude of the running voltage of the self-starting synchronous motor, so that the running current is adjusted correspondingly.
For the self-starting synchronous motor, under the condition that the load torque is not changed, the running current of the self-starting synchronous motor is firstly reduced and then increased along with the reduction of the running voltage, and the motor efficiency is firstly increased and then reduced along with the reduction of the input running voltage, so that the self-starting synchronous motor has an input running voltage value with optimal running, the running current of the self-starting synchronous motor corresponding to the running voltage value is minimum, and the motor efficiency is highest. The target state may be an optimum operating voltage at which the self-starting synchronous motor operates under the current load.
It should be noted that the self-starting synchronous machine has different optimal operating voltages for different load torques.
According to the steps, the operation current of the self-starting synchronous motor is detected, whether the self-starting synchronous motor operates at the highest efficiency under the current load is judged according to the operation current value of the self-starting synchronous motor, the amplitude of the input voltage is correspondingly adjusted, the problem that the optimal efficiency point cannot be reached due to the constant-voltage operation of the self-starting synchronous motor under different loads is solved, and the optimal efficiency operation of the self-starting synchronous motor under different loads is realized.
Optionally, after determining whether the self-starting synchronous motor is operated in the target state according to the operation current, the method further comprises: in the case where the self-starting synchronous machine has been operated in the target state, the current operating voltage is kept in use.
The self-starting synchronous motor operates in a target state, namely at the optimal operating voltage under the current load, the operation efficiency is highest under the current load, and the current operating voltage is kept used without adjusting the input operating voltage.
Optionally, after determining whether the self-starting synchronous motor is operated in the target state according to the operation current, the method further comprises: in the case where the self-starting synchronous motor has been operated in the target state, the adjustment of the operating voltage of the self-starting synchronous motor is stopped.
The target state is the optimal efficiency point of the self-starting synchronous motor running under the current load, so that the self-starting synchronous motor runs at the optimal running voltage after running at the target state, and the running voltage under the current load does not need to be adjusted.
Optionally, before collecting the running current of the self-starting synchronous motor, the method further comprises: detecting whether the load of the self-starting synchronous motor changes; and under the condition that the load of the self-starting synchronous motor changes, the step of collecting the running current of the self-starting synchronous motor is carried out.
After the self-starting synchronous motor is started to the synchronous speed, whether the operation current of the self-starting synchronous motor needs to be collected in the step S101 is influenced by the load and the input operation voltage of the self-starting synchronous motor. Because different loads correspond to different optimal operating voltages, when the load changes, the step S101 needs to be performed to collect the current operating current of the self-starting synchronous motor, and whether the self-starting synchronous motor operates in the target state is determined according to the step S102, so as to determine whether the current self-starting synchronous motor has the minimum operating current under the current load.
As an alternative embodiment, in case of a load change of the self-starting synchronous machine, the voltage adjusting device may be connected to the control circuit of the self-starting synchronous machine by closing a controllable switch connected between the voltage adjusting device and the current detecting device of the self-starting synchronous machine, and the above steps S101-S103 are entered to adjust the operation voltage according to the operation current of the self-starting synchronous machine. Optionally, the controllable switch is automatically closed according to a change in the load value. It should be noted that, no matter whether the controllable switch is closed or not, the running current of the self-starting synchronous motor is always in the collected state, and the controllable switch is used for controlling whether to be connected to the voltage adjusting device or not so as to adjust the running voltage of the self-starting synchronous motor.
The change of the load value includes a case that the running torque of the self-starting synchronous motor is different from the starting torque of the self-starting synchronous motor and a case that the load is changed during the synchronous operation of the self-starting synchronous motor, so that the controllable switch is automatically closed as long as the change of the load is generated, and the controllable switch is automatically closed due to the change of the load, and the action can be an immediate response action to reduce the running time of the self-starting synchronous motor under the non-optimal running voltage.
The load may be an adjustable load or a constant load to which the self-starting synchronous machine is connected.
Optionally, before collecting the running current of the self-starting synchronous motor, the method further comprises: and if the running load of the self-starting synchronous motor is the same as the starting load of the self-starting synchronous motor, after the self-starting synchronous motor is started, the step of collecting the running current of the self-starting synchronous motor is carried out.
After the starting process of the self-starting synchronous motor is finished, if the starting torque of the self-starting synchronous motor is equal to the running torque (namely the running load of the self-starting synchronous motor is the same as the starting load of the self-starting synchronous motor), the controllable switch can be closed in a manual control mode, and the step S101 is entered for collecting the running current of the self-starting synchronous motor; if the running torque of the motor is different from the starting torque of the motor (namely, the running load of the self-starting synchronous motor is different from the starting load of the self-starting synchronous motor), the controllable switch can be automatically closed according to the difference of the load values.
The control of the controllable switch according to the comparison of the operation load and the start load value after the self-starting synchronous motor is started is the first operation of the controllable switch after the self-starting synchronous motor is started. If the closing mode of the controllable switch is manual control, a certain time margin is required to be left before the action.
Optionally, the step of collecting the running current of the self-starting synchronous motor comprises: collecting the running current of the self-starting synchronous motor according to a preset sampling frequency, and determining whether the self-starting synchronous motor runs in a target state according to the running current, wherein the method comprises the following steps: determining whether the running current reaches the minimum current of the self-starting synchronous motor under the current load; if the running current does not reach the minimum current of the self-starting synchronous motor under the current load, determining that the self-starting synchronous motor does not run in the target state; if the operating current has reached a minimum current of the self-starting synchronous machine under the present load, it is determined that the self-starting synchronous machine has operated in the target state.
According to the corresponding relation between the output optimal efficiency point of the self-starting synchronous motor under the determined load and the minimum current value of the running current, if the running current of the self-starting synchronous motor is the minimum value running under the current load, the self-starting synchronous motor is judged to reach the optimal efficiency point under the current load, and at the moment, the self-starting synchronous motor runs in a target state.
Collecting the running current of the self-starting synchronous motor according to a preset sampling frequency, wherein the running current of the self-starting synchronous motor is repeatedly detected according to a set time interval in the sampling frequency, recording the running current value of the last time point, namely I1, and the running current value of the current time point, namely I2, judging that the running current has a decreasing trend if I2 is less than I1, re-assigning values to I1 and I2 according to the updated time point, and repeatedly judging until I2 is not less than I1, at the moment, the minimum running current value is obtained through the detection of the running current, the running current is stopped being detected, and the current running voltage is kept.
It should be noted that, if the load value changes, the operation current needs to be sampled and subjected to cyclic judgment according to the above steps, so as to obtain the minimum operation current of the self-starting synchronous motor under the current load.
Optionally, in a case where a load of the self-starting synchronous motor changes, adjusting an operation voltage of the self-starting synchronous motor to operate the self-starting synchronous motor in a target state includes: if the load is increased, increasing the operating voltage according to a first preset step; if the load decreases, the operating voltage is decreased by a second predetermined step.
The first preset step is a first adjustment step length of the preset running voltage of the self-starting synchronous motor, so that the running voltage is increased by taking the first preset step as a unit; the second preset step is an adjustment step of the preset operating voltage of the self-starting synchronous motor, so that the operating voltage is reduced in units of the second preset step.
If the load value is increased, increasing the operating voltage by increasing the voltage value of the first preset step on the basis of the current operating voltage, and if the load value is decreased, decreasing the voltage value of the second preset step on the basis of the current operating voltage to decrease the operating voltage.
Optionally, in a case where a starting load and an operating load of the self-starting synchronous motor are the same, adjusting an operating voltage of the self-starting synchronous motor to operate the self-starting synchronous motor in a target state includes: the operating voltage is increased or decreased at a third preset step to bring the operating current to the minimum current of the self-starting synchronous motor at the present load.
Because the self-starting synchronous motor has the optimal operation voltage, the operation current corresponding to the optimal operation voltage value is minimum, and the efficiency of the self-starting synchronous motor is highest. The amplitude of the running voltage is adjusted by detecting the running current value of the self-starting synchronous motor, so that the optimal efficiency running control of the motor can be realized, and the specific running voltage adjusting method comprises the following steps:
judging whether I2 < I1 is met, wherein I1 is the running current value detected by the current detection device at the last time point, and I2 is the running current value currently detected by the current detection device; if the current operating voltage value U is satisfied, increasing or decreasing the current operating voltage value U by taking a third preset step3 as a unit so that the operating voltage value is changed to U +/-step 3, and repeating the current detection and circulating the judgment process until I2 is not less than I1; if I2 is not less than I1, the cycle is tripped and the operating voltage U remains unchanged, which according to the previous steps can be obtained from the minimum value of the operating current of the starter synchronous motor at the present load.
It should be noted that, increasing or decreasing the operating voltage according to the third preset step is understood that the adjustment of the operating voltage may be either increased or decreased. Specifically, an attempt may be made to increase the operating voltage value, and if the operating current increases, which indicates that the operating voltage needs to be adjusted in the opposite direction, the operating voltage value is decreased; and if the running current is reduced after the running voltage value is increased, the regulating direction of the running voltage is correct, and the running voltage value is continuously increased.
The third preset step is a third adjustment step of the preset running voltage of the self-starting synchronous motor, so that the starting load and the running load of the self-starting synchronous motor are the same, and the third preset step is increased or decreased by taking the third preset step as a unit.
The first preset step, the second preset step and the third preset step can be the same or different, the value can be set according to the adjustment precision of the operating voltage, and the smaller the value is, the higher the adjustment precision of the operating voltage is.
Through the steps, whether the self-starting synchronous motor works at the optimal operation voltage under the current load or not can be judged according to the operation current value of the self-starting synchronous motor, if the self-starting synchronous motor does not work at the optimal operation voltage, the amplitude of the operation voltage of the self-starting synchronous motor is correspondingly adjusted, the problem that the optimal efficiency point cannot be reached due to the constant-voltage operation of the self-starting synchronous motor under different loads is solved, and the optimal efficiency operation of the self-starting synchronous motor under different loads is realized.
Fig. 2 is a schematic diagram of an alternative control system for a self-starting synchronous motor according to an embodiment of the present invention. The control system of the self-starting synchronous machine comprises the self-starting synchronous machine 20, a current detection device 21, a voltage amplitude modulation device 22, a load 23 and a controllable switch S1. The self-starting synchronous motor 20, the current detection device 21 and the voltage amplitude modulation device 22 form a closed-loop control loop of the optimal operation voltage of the self-starting synchronous motor.
The self-starting synchronous motor 20 is a controlled part, connected with the load 23, the voltage amplitude modulation device 22 and the current detection device 21, and the self-starting synchronous motor 20 receives the load torque value output by the load 23 and the voltage value output by the voltage amplitude modulation device 22, and the current value output by the self-starting synchronous motor 20 is an input signal of the current detection device 21.
The current detection device 21 receives a current value signal output from the starter synchronous motor 20, and its output signal operates the operation of the voltage amplitude modulation device 22. The voltage modulation device 22 includes, but is not limited to, autotransformers, induction regulators, motor-generator sets, and the like that may be used for self-starting synchronous motor voltage regulation.
The load 23, which may be an adjustable load or a constant load to which the self-starting synchronous machine 20 is connected, is connected to a load input of the shaft of the self-starting synchronous machine 20. Alternatively, the controllable switch S1 may be automatically closed or opened under the combined control of the load 23 and the voltage amplitude modulation device 22, or the controllable switch S1 may be manually controlled. The load 23 controls the closing of S1, the value of the load 23 is changed, and the controllable switch S1 can be automatically closed; the voltage amplitude modulation device 22 controls the switch-off of S1, and when the operation voltage output by the voltage amplitude modulation device 22 is not changed, the controllable switch S1 is switched off.
Fig. 3 is an alternative control method of the self-starting synchronous motor based on the control system of the self-starting synchronous motor provided in fig. 2, which includes:
in step S301, the controllable switch S1 is turned off, the load is connected, and the self-starting synchronous motor is started to a synchronous speed at a starting voltage. At the moment, the current detection device and the voltage amplitude modulation device are not connected into a closed-loop control loop of the running voltage of the self-starting synchronous motor, and the regulation of the input voltage of the self-starting synchronous motor is not started.
In step S302, the controllable switch S1 is closed, and the closed-loop control loop of the self-starting synchronous motor with the optimal operating voltage is closed.
In step S302, closing the controllable switch S1 is the first action of S1, which occurs after the self-starting synchronous machine starting process is completed. If the starting torque of the self-starting synchronous motor is the running torque of the self-starting synchronous motor, the first closing action of the S1 needs to be manually controlled, and a certain time needs to be left before manual operation so as to determine that the self-starting synchronous motor finishes the starting process; if the running torque and the starting torque of the self-starting synchronous motor are different, the first action of S1 can be automatically controlled by the load, after the self-starting synchronous motor is started, the running load of the self-starting synchronous motor is connected, the torque of the self-starting synchronous motor is changed, and the controllable switch S1 is automatically closed according to the change of the torque.
Step S303 is to adjust the operating voltage of the self-starting synchronous motor according to the current value detected by the current detection device until U is unchanged, and then S1 is turned off.
Specifically, as shown in fig. 4, a flow chart of a control logic for adjusting the operating voltage of the self-starting synchronous motor according to the current value detected by the current detection device is shown, where I1 is the current value detected by the current detection device at the last time point according to the sampling frequency, and I2 is the current value currently detected by the current detection device according to the sampling frequency; u is an operation voltage value output by the voltage amplitude modulation device, an initial voltage U is set as a starting voltage, and the starting voltage is greater than a rated voltage value; step is the adjusting step length of the running voltage of the self-starting synchronous motor, and can be set according to the adjusting precision of the voltage amplitude modulation device, and the smaller the step value is, the higher the adjusting precision of the control system is. The steps of the control logic include:
step S401, collecting the running current of the self-starting synchronous motor, and recording the current value I1 detected at the last time point and the current value I2 detected currently; the values of I1 and I2 are updated in real time according to the passage of the detection time, specifically, according to the sampling frequency, the original I2 value is assigned to I1 every time point is passed, and the current value newly acquired at present is assigned to I2.
In step S402, it is determined whether I2 < I1 is satisfied, that is, whether the current operating current is the minimum current under the current load is determined. If I2 < I1 is true, go to step S403; if I2 is not less than I1, proceed to step S404;
step S403, assigning a value of (U +/-step) to U (namely, increasing or decreasing the adjustment step based on the initial voltage U), assigning the value of I2 in step S402 to I1, returning to step S401 to detect the current value at the next time point, assigning the current value to I2, comparing the reassigned I1 and I2, repeating the steps until I2 is not less than I1, and entering step S404;
step S404, keeping the current operation voltage U unchanged, and entering step S405 to end the detection cycle.
When the load value changes, it is necessary to re-enter step S401 to perform the above-described steps S401 to S405. In step S403, if the load value is large, the operating voltage is adjusted by increasing the adjustment step based on the initial voltage U, the adjusted operating voltage value is U + step, and if the load value is small, the operating voltage is adjusted by decreasing the adjustment step based on the initial voltage U, and the adjusted operating voltage value is U-step.
According to the steps, the output operation voltage of the voltage amplitude modulation device corresponds to the minimum value of the operation current of the self-starting synchronous motor, and the operation efficiency of the self-starting synchronous motor under the current load is highest. Optionally, after the self-starting synchronous motor reaches the optimal operating voltage, if the output operating voltage of the voltage amplitude modulation device remains unchanged for a certain time, the closed-loop control circuit of the optimal operating voltage of the self-starting synchronous motor is disconnected, that is, the controllable switch S1 is disconnected. The time range in which the operating voltage is maintained may be set according to the detection accuracy of the current detection device, and it is determined that the operating voltage of the self-starting synchronous motor is adjusted to an optimum voltage value in consideration of signal transmission of the current detection device and an operation delay of the voltage amplitude modulation device.
And step S304, the self-starting synchronous motor enters the running state under the optimal running voltage until the load torque is changed, the controllable switch S1 is closed, and the steps S302 to S304 are repeated.
Since the optimal operating voltage values of the self-starting synchronous motor corresponding to different load torques are different, when the load torque changes, the process from step S302 to step S304 needs to be repeated to readjust the optimal operating voltage of the self-starting synchronous motor. The action of closing the controllable switch S1 in step S304 is a non-first action of S1, which can be automatically controlled by the load module, and is an immediate response action to reduce the operation time of the self-starting synchronous motor at a non-optimal operation voltage.
Fig. 5 is a schematic diagram showing the relationship between current-voltage and efficiency-voltage in the voltage control method of the self-starting synchronous motor according to the embodiment of the present invention, and fig. 5 is a schematic diagram showing the input operation voltage of the self-starting synchronous motor on the abscissa, the operation current of the self-starting synchronous motor on the ordinate of the broken line, and the efficiency of the self-starting synchronous motor on the ordinate of the solid line. Under the condition that the load is not changed, the running current of the self-starting synchronous motor is firstly reduced and then increased along with the reduction of the input running voltage, and the efficiency of the self-starting synchronous motor is firstly increased and then reduced along with the reduction of the input running voltage. Therefore, as can be seen from fig. 5, the self-starting synchronous motor has the optimal operating voltage, the corresponding operating current of the self-starting synchronous motor is the minimum, and the efficiency is the highest.
According to the embodiment, the amplitude of the input running voltage of the self-starting synchronous motor is correspondingly adjusted by detecting the running current value of the self-starting synchronous motor, so that the problem that the running voltage of the self-starting synchronous motor is constant and unadjustable under different loads is solved, on the other hand, the self-starting synchronous motor runs under the voltage value corresponding to the minimum current, and the optimal efficiency running state control of the self-starting synchronous motor under different loads is realized.
Example 2
According to an embodiment of the present invention, there is provided a control system embodiment of a self-starting synchronous machine, as shown in fig. 6, including a self-starting synchronous machine 60; a current detection device 61 for collecting an operation current of the self-starting synchronous motor 60 after the self-starting synchronous motor 60 is started to a synchronous speed; determining whether the self-starting synchronous motor 60 is operated in the target state according to the operation current; wherein, when the self-starting synchronous motor 60 is operated in the target state, the operation efficiency is highest under the current load; and a voltage adjusting device 62 connected to the current detecting device 61 for adjusting the operating voltage of the self-starting synchronous motor 60 so that the self-starting synchronous motor 60 operates in the target state when the self-starting synchronous motor does not operate in the target state.
Optionally, the system further includes: a load giving module in communication with the self-starting synchronous machine for serving as a load for the self-starting synchronous machine; and the controllable switch is arranged between the current detection device and the voltage regulation device and is used for being switched off when the self-starting synchronous motor is operated in a target state and being switched on when the load of the self-starting synchronous motor is changed.
The load setting module is used as a load of the self-starting synchronous motor, and the load value is adjustable by setting different set values. The self-starting synchronous motor, the current detection device, the voltage adjustment device and the load setting module form a closed-loop control circuit of the running voltage of the self-starting synchronous motor.
The voltage adjusting device is a voltage amplitude adjusting device for adjusting the control voltage amplitude of the synchronous motor.
Optionally, a voltage adjusting device of the self-starting synchronous motor may add a rotation speed detection module; the self-starting synchronous motor operation voltage can be adjusted by an automatic control system or a manual adjustment mode.
According to an embodiment of the present invention, there is provided an embodiment of a storage medium including a stored program, wherein the control method of the self-starting synchronous motor is executed by controlling a device in which the storage medium is located when the program is executed.
According to an embodiment of the present invention, an embodiment of a processor for running a program is provided, wherein the program is run to execute the control method of the self-starting synchronous motor described above.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
In the above embodiments of the present invention, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed technology can be implemented in other ways. The above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units may be a logical division, and in actual implementation, there may be another division, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, units or modules, and may be in an electrical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (12)
1. A control method of a self-starting synchronous motor, characterized by comprising:
collecting the running current of the self-starting synchronous motor after the self-starting synchronous motor is started to a synchronous speed;
determining whether the self-starting synchronous motor operates in a target state according to the operating current, wherein when the self-starting synchronous motor operates in the target state, the operation efficiency is highest under the current load;
and under the condition that the self-starting synchronous motor is not operated in the target state, adjusting the operation voltage of the self-starting synchronous motor so as to enable the self-starting synchronous motor to be operated in the target state.
2. The method of claim 1, wherein after determining whether the self-starting synchronous machine is operating in a target state based on the operating current, the method further comprises:
in the case where the self-starting synchronous machine has been operated in the target state, the current operating voltage is kept in use.
3. The method of claim 1, wherein after determining whether the self-starting synchronous machine is operating in a target state based on the operating current, the method further comprises: stopping adjusting the operating voltage of the self-starting synchronous motor when the self-starting synchronous motor has operated in the target state.
4. The method of claim 1, wherein prior to collecting the operating current of the self-starting synchronous machine, the method further comprises:
detecting whether the load of the self-starting synchronous motor changes or not;
and under the condition that the load of the self-starting synchronous motor changes, acquiring the running current of the self-starting synchronous motor.
5. The method of claim 1, wherein prior to collecting the operating current of the self-starting synchronous machine, the method further comprises:
and if the running load of the self-starting synchronous motor is the same as the starting load of the self-starting synchronous motor, after the self-starting synchronous motor is started, the step of collecting the running current of the self-starting synchronous motor is carried out.
6. The method according to any one of claims 1 to 5, characterized in that the step of collecting the operating current of the self-starting synchronous machine comprises: collecting the running current of the self-starting synchronous motor according to a preset sampling frequency, and determining whether the self-starting synchronous motor runs in a target state according to the running current, wherein the method comprises the following steps:
determining whether the operating current reaches a minimum current of the self-starting synchronous motor under a current load;
if the running current does not reach the minimum current of the self-starting synchronous motor under the current load, determining that the self-starting synchronous motor does not run in a target state;
determining that the self-starting synchronous motor has been operated in a target state if the operating current has reached a minimum current of the self-starting synchronous motor under a present load.
7. The method of claim 1, wherein adjusting the operating voltage of the self-starting synchronous machine to operate the self-starting synchronous machine in the target state in the event of a change in the load of the self-starting synchronous machine comprises:
if the load is increased, increasing the operating voltage according to a first preset step;
and if the load is reduced, reducing the operating voltage according to a second preset step.
8. The method of claim 1, wherein adjusting the operating voltage of the self-starting synchronous machine to operate the self-starting synchronous machine in the target state under the condition that a starting load and an operating load of the self-starting synchronous machine are the same comprises:
increasing or decreasing the operating voltage at a third predetermined step to bring the operating current to a minimum current of the self-starting synchronous motor at a present load.
9. A control system for a self-starting synchronous machine, comprising:
self-starting a synchronous motor;
the current detection device is used for collecting the running current of the self-starting synchronous motor after the self-starting synchronous motor is started to a synchronous speed; determining whether the self-starting synchronous motor operates in a target state according to the operating current; when the self-starting synchronous motor operates in the target state, the operation efficiency is highest under the current load;
and the voltage adjusting device is connected with the current detecting device and used for adjusting the running voltage of the self-starting synchronous motor under the condition that the self-starting synchronous motor is not operated in the target state so as to enable the self-starting synchronous motor to be operated in the target state.
10. The control system of claim 9, further comprising:
a load giving module in communication with the self-starting synchronous machine for serving as a load for the self-starting synchronous machine;
and the controllable switch is arranged between the current detection device and the voltage regulation device and is used for being switched off when the self-starting synchronous motor is operated in the target state and being switched on when the load of the self-starting synchronous motor changes.
11. A storage medium characterized by comprising a stored program, wherein a device in which the storage medium is located is controlled to execute the control method of the self-starting synchronous motor according to any one of claims 1 to 8 when the program is executed.
12. A processor, characterized in that the processor is configured to run a program, wherein the program is configured to execute the control method of the self-starting synchronous machine according to any one of claims 1 to 8 when running.
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Application publication date: 20210413 |