CN107104621B - Weak magnetic control method and device for running speed of alternating current motor - Google Patents
Weak magnetic control method and device for running speed of alternating current motor Download PDFInfo
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- CN107104621B CN107104621B CN201710289143.2A CN201710289143A CN107104621B CN 107104621 B CN107104621 B CN 107104621B CN 201710289143 A CN201710289143 A CN 201710289143A CN 107104621 B CN107104621 B CN 107104621B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/0086—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for high speeds, e.g. above nominal speed
- H02P23/009—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for high speeds, e.g. above nominal speed using field weakening
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Abstract
The invention relates to the technical field of automatic control, and discloses a method and a device for controlling the operating speed of an alternating current motor in a weak magnetic field mode. In the invention, the method comprises the following steps: acquiring a direct-axis output voltage output by the torque inner ring; determining weak magnetic rotation speed compensation according to the output voltage of the straight shaft; and adjusting actual rotating speed setting according to flux weakening rotating speed compensation, and controlling the rotating speed of the alternating current motor according to the adjusted actual rotating speed setting. The embodiment of the invention determines the flux weakening rotation speed compensation by acquiring the direct axis voltage, and adjusts the actual rotation speed setting after the flux weakening rotation speed compensation according to the flux weakening rotation speed compensation so as to control the rotation speed of the alternating current motor. Therefore, when the motor runs in a deep weak magnetic field, the rotating speed of the alternating current motor is controlled by giving the actual rotating speed after the weak magnetic rotating speed compensation, the purpose of preventing the motor from being out of control can be achieved, and meanwhile, the working stability of the motor is improved.
Description
Technical Field
The invention relates to the technical field of automatic control, in particular to a method and a device for controlling the operation speed of an alternating current motor in a flux weakening manner.
Background
In the conventional ac motor vector control method, as the motor rotation speed increases, the voltage output from the power converter is required to increase linearly. However, the voltage output by the power converter is limited. When the motor control demand voltage exceeds the maximum output voltage of the power converter (i.e., the maximum voltage output by the power converter cannot meet the voltage requirement for actual operation of the motor), the motor needs to be subjected to field weakening control.
In the field weakening control (for example, a voltage closed loop method) the field weakening depth is deepened as the rotation speed of the motor gradually increases and the load applied to the motor increases. Example of operation with the motor in motoring mode: as shown in FIG. 1, the motor enters flux weakening controlThen, as the weak magnetic depth increases, the direct axis outputs voltage (i.e. U in the figure)dCurve) gradually decreases to-1 p.u (from
The formula is obtained by the following formula
The ratio of (A) to (B); the corresponding physical meaning is that the output phase voltage peak value linear operation area of the frequency converter can reach the limit value, the per unit of the phase voltage limit value is-1 p.u), and the cross-axis output voltage (namely U in the figure)qCurve) gradually falls to 0p.u, at which point the motor is susceptible to saturation runaway. That is, when the absolute value of the direct-axis output voltage of the power converter gradually increases and reaches the limit value of the output voltage of the power converter, the motor may be saturated out of control or even damaged.
Disclosure of Invention
The invention aims to provide a method and a device for controlling the running speed of an alternating current motor in a flux weakening manner, so that the purpose of preventing the motor from being out of control can be achieved when the motor runs in a deep flux weakening manner, and the working stability of the motor is improved.
In order to solve the above technical problem, an embodiment of the present invention provides a method for controlling an operating speed of an ac motor by flux weakening, including:
acquiring a direct-axis output voltage output by the torque inner ring;
determining weak magnetic rotation speed compensation according to the output voltage of the straight shaft;
and adjusting actual rotating speed setting according to flux weakening rotating speed compensation, and controlling the rotating speed of the alternating current motor according to the adjusted actual rotating speed setting.
The embodiment of the invention also provides a flux-weakening control device for the running speed of the alternating current motor, which comprises: the device comprises an acquisition module, a determination module and a processing module;
the acquisition module is used for acquiring the direct-axis output voltage output by the torque inner ring;
the determining module is used for determining weak magnetic rotation speed compensation according to the direct-axis output voltage;
and the processing module is used for adjusting the actual rotating speed set according to the flux weakening rotating speed compensation and controlling the rotating speed of the alternating current motor according to the adjusted actual rotating speed set.
Compared with the prior art, the implementation method of the invention determines the flux weakening rotation speed compensation by acquiring the direct axis voltage, and adjusts the actual rotation speed setting according to the flux weakening rotation speed compensation so as to control the rotation speed of the alternating current motor. Therefore, when the motor runs in a deep weak magnetic field, the rotating speed of the alternating current motor is controlled by giving the actual rotating speed after the weak magnetic rotating speed compensation, the purpose of preventing the motor from being out of control can be achieved, and meanwhile, the working stability of the motor is improved.
In addition, calculating the difference value between the absolute value of the direct-axis output voltage and a preset voltage threshold; and determining the flux weakening rotation speed compensation according to the difference. Therefore, the actual rotating speed setting can be adjusted according to the change of the output voltage of the direct shaft so as to control the rotating speed of the alternating current motor and prevent the alternating current motor from being out of control.
In addition, determining a first speed set based on the difference; and carrying out amplitude limiting operation on the first speed to obtain weak magnetic rotation speed compensation. The amplitude limiting operation limits the value of the weak magnetic rotation speed compensation, and the effectiveness and the stability of the motor control system in adjusting the rotation speed of the motor are improved.
In addition, the flux weakening rotation speed compensation and the second speed setting are summed to obtain the actual speed setting.
In addition, the difference value between the preset voltage threshold value and the limit value of the output voltage of the frequency converter is within the range of +/-0.5 times of the limit value of the output voltage of the frequency converter; or the difference value between the preset voltage threshold and the limit value of the output voltage of the frequency converter set by the system is within +/-0.5 time of the limit value of the output voltage of the frequency converter set by the system.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings which correspond to and are not to be construed as limiting the embodiments, in which elements having the same reference numeral designations are shown as similar elements, and in which the drawings are not to scale unless otherwise specified.
FIG. 1 is a prior art field weakening voltage waveform schematic for an AC motor;
fig. 2 is a flowchart of a field weakening control method for an operation speed of an ac motor according to a first embodiment of the present invention;
fig. 3 is a flowchart of a field weakening control method for an operation speed of an ac motor according to a second embodiment of the present invention;
fig. 4 is a block diagram showing a configuration of a field weakening control method for an operation speed of an ac motor according to a second embodiment of the present invention;
fig. 5 is a schematic structural view of a field weakening control apparatus for controlling the operating speed of an ac motor according to a third embodiment of the present invention;
fig. 6 is a schematic structural view of a field weakening control apparatus for an operation speed of an ac motor according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
The first embodiment of the present invention relates to a method for controlling the operating speed of an ac motor by flux weakening, and the specific flow is as shown in fig. 2, which includes:
and step 101, acquiring a direct-axis output voltage output by the torque inner ring.
Specifically, in the method (system) of vector control of the ac motor, the basic principle of the vector control is to decompose the stator current vector of the ac motor into a current component generating a magnetic field and a current component generating torque according to the magnetic field orientation principle, and to control them separately, since the amplitude and phase of the two components are controlled simultaneously, i.e. the current vector of the stator is controlled. In the idea of coordinate change, a direct axis generates a direct axis current and a direct axis voltage; the quadrature axis generates quadrature axis current and quadrature axis voltage. In the control system of the motor, the torque inner ring outputs a direct-axis voltage and a quadrature-axis voltage at the same time, and the direct-axis voltage output in the torque inner ring is acquired in the method.
And 102, determining weak magnetic rotation speed compensation according to the output voltage of the direct axis.
Specifically, a certain amount of calculation and a series of adjustment processing are carried out according to the acquired direct-axis output voltage output by the torque inner ring, and then flux weakening rotation speed compensation is output. And the field weakening rotational speed compensation is characterized by the angular frequency of the motor. The magnitude of the angular frequency of the motor can reflect the speed of the rotation speed of the motor, namely, the larger the angular frequency of the motor is, the faster the rotation speed of the motor is, and conversely, the smaller the angular frequency of the motor is, the slower the rotation speed of the motor is.
And 103, adjusting actual rotating speed setting according to the flux weakening rotating speed compensation, and controlling the rotating speed of the alternating current motor according to the adjusted actual rotating speed setting.
Specifically, according to the flux weakening rotation speed compensation, the rotation speed compensation is performed on the currently input speed setting, and the actual rotation speed setting is obtained after the rotation speed compensation is completed, thereby enabling the rotation speed of the alternating current motor to be controlled according to the adjusted actual rotation speed setting.
Compared with the prior art, the implementation method of the invention determines the flux weakening rotation speed compensation by acquiring the direct axis voltage, and adjusts the actual rotation speed setting according to the flux weakening rotation speed compensation so as to control the rotation speed of the alternating current motor. Therefore, when the motor runs in a deep weak magnetic field, the rotating speed of the alternating current motor is controlled by giving the actual rotating speed after the weak magnetic rotating speed compensation, the purpose of preventing the motor from being out of control can be achieved, and meanwhile, the working stability of the motor is improved.
In the implementation, there are various specific implementations of determining the flux weakening rotation speed compensation according to the output voltage of the direct axis, and a specific implementation is given in the second implementation, and it should be noted that what is given in the second implementation is only one of the various implementations, and the application is not limited to the cases listed in the second implementation.
The second embodiment of the invention relates to a flux weakening control method for the running speed of an alternating current motor, which is an improvement of the first embodiment and mainly improves the following steps: in the second embodiment of the present invention, it is necessary to calculate the difference between the absolute value of the direct-axis output voltage and the preset voltage threshold, and determine the field weakening rotation speed compensation according to the difference. Therefore, the actual rotating speed setting can be adjusted according to the change of the output voltage of the direct shaft so as to control the rotating speed of the alternating current motor and prevent the alternating current motor from being out of control.
The flowchart of the present embodiment is shown in fig. 3, and includes:
Specifically, the absolute value of the direct-axis output voltage is calculated according to the acquired direct-axis output voltage, and the calculated absolute value is subtracted from a preset voltage threshold, that is, the absolute value is subtracted from the preset voltage value to obtain a difference value. The difference value between the preset voltage threshold value and the limit value of the output voltage of the frequency converter is within the range of +/-0.5 time of the limit value of the output voltage of the frequency converter; or the difference value between the preset voltage threshold value and the frequency converter output voltage limit value set by the system is within +/-0.5 time of the frequency converter output voltage limit value set by the system. That is, the output voltage of the inverter has a maximum voltage output value, which is the physical limit value of the output voltage of the inverter or a limit value preset by the system, for example, the maximum voltage output value of the inverter is 311V, and the preset voltage threshold value of the motor is set to be between 155V and 467V. It should be noted that the set threshold value is generally close to the limit value of the output voltage of the frequency converter. That is, the set threshold value may be slightly larger or slightly smaller than the output voltage limit value of the frequency converter. For example, the preset voltage threshold may be
Or
In step 203, a first speed setting is determined based on the difference.
Specifically, the first speed setting is determined based on the difference between the absolute value of the direct-axis output voltage and a preset voltage threshold. The specific determination mode can be determined by the regulator. For example: PID (proportional integral derivative, PID), variable gain PID regulator, IP (integral protocol) or fuzzy controller. The regulator determines a first speed setting according to the difference between the absolute value of the direct-axis output voltage obtained by calculation and a preset voltage threshold, and the first speed setting is characterized by the angular frequency of the motor.
And step 204, carrying out amplitude limiting operation on the first speed setting to obtain flux weakening rotation speed compensation.
Specifically, the slicing operation limits the output signal between a set maximum value and a set minimum value. When the input signal is between the set maximum and minimum values, the output equals the input; when the input is larger than the maximum limit value, the output is the maximum limit value; and outputting the minimum limit value when the input is smaller than the minimum limit value.
In the present embodiment, however, the limiter operation is performed on the determined first speed setting, and the purpose of the limiter operation is to limit the input first speed setting within an appropriate range, thereby avoiding large fluctuations in the motor control system due to large flux weakening rotational speed compensation. That is, when the first speed is given between the maximum limit value and the minimum limit value set by the limiter, the feedback speed of the output is given equal to the first speed; when the first speed is given to be greater than the maximum limit value, the output feedback speed is given to be the maximum limit value; when the first speed is given less than the minimum limit value, the output feedback speed is given as the minimum limit value. In addition, the maximum limit value and the minimum limit value set by the limiter are not limited at all, and those skilled in the art can flexibly set the maximum limit value and the minimum limit value according to actual needs. The value of the flux weakening rotation speed compensation is limited between the maximum limit value and the minimum limit value set by the amplitude limiter through amplitude limiting operation, so that the phenomenon that a control system of the motor generates large fluctuation due to large flux weakening rotation speed compensation is avoided, and the stability and the effectiveness of the motor control system in regulating the rotation speed of the motor are improved.
And step 205, summing the flux weakening rotation speed compensation and the second speed given value to obtain an actual speed given value.
Specifically, the control system of the motor receives the flux weakening rotation speed compensation, outputs an actual rotation speed set after summing the flux weakening rotation speed compensation and the second speed set input at the moment, and adjusts the actual rotation speed of the motor according to the actual rotation speed set so as to control the motor to operate.
And step 206, controlling the rotation speed of the alternating current motor according to the regulated actual rotation speed.
In one specific implementation, the specific implementation of vector adjustment is shown in FIG. 4.
Specifically, the control system of the motor inputs a second speed set WrefBy giving the second speed WrefOutputting given actual rotating speed and given actual rotating speed as W after compensation and summation operation with flux weakening rotating speedref2Then by giving the actual rotational speed Wref2And velocity feedback WfdkComparing the actual rotation speed with Wref2And velocity feedback WfdkThe difference value is sent into a speed ring (ASR for short) to be calculated to obtain a target torque
To the torque inner ring, and outputting the direct-axis voltage through the calculation of the torque inner ring
And quadrature voltage
And applying a direct axis voltage
And quadrature voltage
The signal is input into a Space Vector Pulse Width Modulation (SVPWM) for regulation, and finally, a Pulse Width Modulation (PWM) signal with different duty ratios is output to an inverter switch tube to realize the control of the motor operation. And the part in the dotted line frame is
The feedback part of the saturation frequency limit. The part includes:
obtaining the direct-axis output voltage output by the torque inner ring
Then, the direct-axis output voltage is obtained through an abs () absolute value operation module
Absolute value of (2)
And outputs the voltage from the direct axis
Absolute value of (2)
Inputting the difference value between the preset voltage threshold value and the preset voltage threshold value (the difference value between the preset voltage threshold value and the limit value of the output voltage of the frequency converter is within +/-0.5 times of the limit value of the output voltage of the frequency converter, or the difference value between the preset voltage threshold value and the limit value of the output voltage of the frequency converter set by the system is within +/-0.5 times of the limit value of the output voltage of the frequency converter set by the system) into a regulator, outputting the first speed to a limiter after calculation and conversion by the regulator, outputting the weak magnetic rotating speed to compensate to a summation operation module through the limiting operation of the limiter, and outputting the second speed to a W by a control system of the motorrefThe given summation operation with the feedback speed is carried out, and the given actual speed is output as Wref2Given W according to actual speedref2The actual rotational speed of the ac motor is adjusted. The embodiment can continuously perform the circular feedback through the closed-loop control mode, and can control the operation of the motor
Restricted to adjacent UdlimitThe state of the motor ensures that the motor is not out of control in the flux weakening operation.
It should be noted that the present embodiment is only an example, and is not limited to the present embodiment, and the method for controlling the field weakening of the operation speed of the ac motor is also applicable to a permanent magnet synchronous motor PMSM (permanent magnet synchronous motor, abbreviated as "PMSM") and the like.
Compared with the prior art, the implementation method of the invention determines the flux weakening rotation speed compensation by acquiring the direct axis voltage, and adjusts the actual rotation speed setting according to the flux weakening rotation speed compensation so as to control the rotation speed of the alternating current motor. Therefore, when the motor runs in a deep weak magnetic field, the rotating speed of the alternating current motor is controlled by giving the actual rotating speed after the weak magnetic rotating speed compensation, the purpose of preventing the motor from being out of control can be achieved, and meanwhile, the working stability of the motor is improved.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the steps contain the same logical relationship, which is within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
A third embodiment of the present invention relates to a field weakening control apparatus 500 for controlling an operating speed of an ac motor, as shown in fig. 5, including: the device comprises an acquisition module 501, a determination module 502 and a processing module 503.
The obtaining module 501 is configured to obtain a direct-axis output voltage output by the torque inner ring.
A determining module 502, configured to determine flux weakening rotation speed compensation according to the direct axis output voltage.
And the processing module 503 is configured to adjust an actual rotation speed setting according to the flux weakening rotation speed compensation, and control the rotation speed of the ac motor according to the adjusted actual rotation speed setting.
Compared with the prior art, the implementation method of the invention determines the flux weakening rotation speed compensation by acquiring the direct axis voltage, and adjusts the actual rotation speed setting according to the flux weakening rotation speed compensation so as to control the rotation speed of the alternating current motor. Therefore, when the motor runs in a deep weak magnetic field, the rotating speed of the alternating current motor is controlled by giving the actual rotating speed after the weak magnetic rotating speed compensation, the purpose of preventing the motor from being out of control can be achieved, and meanwhile, the working stability of the motor is improved.
It should be understood that this embodiment is an example of the apparatus corresponding to the first embodiment, and may be implemented in cooperation with the first embodiment. The related technical details mentioned in the first embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the first embodiment.
It should be noted that each module referred to in this embodiment is a logical module, and in practical applications, one logical unit may be one physical unit, may be a part of one physical unit, and may be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, elements that are not so closely related to solving the technical problems proposed by the present invention are not introduced in the present embodiment, but this does not indicate that other elements are not present in the present embodiment.
A fourth embodiment of the present invention relates to a field weakening control apparatus 600 for ac motor operation speed, and as shown in fig. 6, the fourth embodiment is an improvement of the third embodiment, and the main improvements are: in the fourth embodiment of the present invention, it is necessary to calculate the difference between the absolute value of the direct-axis output voltage and the preset voltage threshold, and determine the flux weakening rotation speed compensation according to the difference. Therefore, the actual rotating speed setting can be adjusted according to the change of the output voltage of the direct shaft so as to control the rotating speed of the alternating current motor and prevent the alternating current motor from being out of control.
Specifically, in the present embodiment, the field weakening control apparatus 600 for ac motor operating speed, the determination module 601 includes: a first calculation submodule 6011, a first determination submodule 6012, and a second calculation submodule 6013; the processing module 603 includes: third calculation submodule 6031.
The first calculating submodule 6021 is configured to calculate a difference between the absolute value of the direct-axis output voltage and a preset voltage threshold. (wherein, the difference value between the preset voltage threshold value and the limit value of the output voltage of the frequency converter is within the range of +/-0.5 times of the limit value of the output voltage of the frequency converter, or the difference value between the preset voltage threshold value and the limit value of the output voltage of the frequency converter set by the system is within the range of +/-0.5 times of the limit value of the output voltage of the frequency converter set by the system.)
The first determination submodule 6022 is further configured to determine a first speed setting based on the difference.
And a second calculation word module 6023, configured to perform amplitude limiting operation on the first speed setting to obtain weak magnetic rotation speed compensation.
And a third calculation module 6031, configured to sum the flux weakening rotation speed compensation with the second speed setting to obtain an actual speed setting.
Compared with the prior art, the implementation method of the invention determines the flux weakening rotation speed compensation by acquiring the direct axis voltage, and adjusts the actual rotation speed setting according to the flux weakening rotation speed compensation so as to control the rotation speed of the alternating current motor. Therefore, when the motor runs in a deep weak magnetic field, the rotating speed of the alternating current motor is controlled by giving the actual rotating speed after the weak magnetic rotating speed compensation, the purpose of preventing the motor from being out of control can be achieved, and meanwhile, the working stability of the motor is improved.
It should be understood that this embodiment is a system example corresponding to the second embodiment, and that this embodiment can be implemented in cooperation with the second embodiment. The related technical details mentioned in the second embodiment are still valid in this embodiment, and are not described herein again in order to reduce repetition. Accordingly, the related-art details mentioned in the present embodiment can also be applied to the second embodiment.
Those skilled in the art can understand that all or part of the steps in the method of the foregoing embodiments may be implemented by a program to instruct related hardware, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, etc.) or a processor (processor) to execute all or part of the steps of the method described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (8)
1. A flux-weakening control method for the running speed of an alternating current motor is characterized by comprising the following steps:
acquiring a direct-axis output voltage output by the torque inner ring;
determining weak magnetic rotation speed compensation according to the direct-axis output voltage;
adjusting actual rotating speed setting according to the flux weakening rotating speed compensation, and controlling the rotating speed of the alternating current motor according to the adjusted actual rotating speed setting;
the determining of the flux weakening rotation speed compensation according to the direct-axis output voltage comprises the following steps:
calculating the difference value between the absolute value of the direct-axis output voltage and a preset voltage threshold;
and determining weak magnetic rotation speed compensation according to the difference.
2. The method of claim 1, wherein determining a flux weakening rotational speed compensation based on the difference comprises:
determining a first speed setting according to the difference;
and carrying out amplitude limiting operation on the first speed setting to obtain the flux weakening rotation speed compensation.
3. The method for flux-weakening control of an operating speed of an alternating current motor as claimed in claim 1 or 2, wherein said compensation adjustment of an actual rotational speed setting in accordance with said flux-weakening rotational speed comprises:
and summing the flux weakening rotation speed compensation and the second speed setting to obtain the actual rotation speed setting.
4. The method of claim 1, wherein the difference between the preset voltage threshold and the limit value of the output voltage of the inverter is within ± 0.5 times of the limit value of the output voltage of the inverter; or the difference value between the preset voltage threshold value and the frequency converter output voltage limit value set by the system is within the range of +/-0.5 times of the frequency converter output voltage limit value set by the system.
5. A flux-weakening control device for the operating speed of an alternating current motor is characterized by comprising: the device comprises an acquisition module, a determination module and a processing module;
the acquisition module is used for acquiring the direct-axis output voltage output by the torque inner ring;
the determining module is used for determining weak magnetic rotation speed compensation according to the direct-axis output voltage;
the processing module is used for adjusting actual rotating speed setting according to the flux weakening rotating speed compensation and controlling the rotating speed of the alternating current motor according to the adjusted actual rotating speed setting;
the determining module comprises: a first calculation submodule and a first determination submodule;
the first calculation submodule is used for calculating the difference value between the absolute value of the direct-axis output voltage and a preset voltage threshold;
and the first determining submodule is used for determining the flux weakening rotation speed compensation according to the difference value.
6. The apparatus for flux-weakening control of an operating speed of an alternating current motor as claimed in claim 5, wherein said determination module further comprises: a second calculation submodule;
the first determining submodule is further used for determining a first speed setting according to the difference value;
and the second calculation submodule is used for carrying out amplitude limiting operation on the first speed setting to obtain the flux weakening rotation speed compensation.
7. The apparatus for controlling ac motor operating speed according to claim 5 or 6, wherein the processing module comprises: a third computing submodule;
and the third calculation submodule is used for summing the flux weakening rotation speed compensation and the second speed given value to obtain the actual rotation speed given value.
8. The apparatus for controlling ac motor operation speed according to claim 6, wherein the difference between the preset voltage threshold and the inverter output voltage limit value is within ± 0.5 times of the inverter output voltage limit value; or the difference value between the preset voltage threshold value and the frequency converter output voltage limit value set by the system is within the range of +/-0.5 times of the frequency converter output voltage limit value set by the system.
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| CN108288933B (en) * | 2018-01-17 | 2020-08-25 | 东南大学 | Segmented magnetic regulation control method for alternating current magnetic regulation type memory motor |
| CN111130423B (en) * | 2018-10-29 | 2022-02-11 | 广东美的环境电器制造有限公司 | Motor drive control method and device |
| CN111030292B (en) * | 2019-12-31 | 2021-09-24 | 海信集团有限公司 | Power control method for standby power mode of electric equipment and electric equipment |
| CN111800045B (en) * | 2020-07-20 | 2022-01-18 | 浙江零跑科技股份有限公司 | Vector stepless flux weakening method of permanent magnet synchronous motor |
| CN114337442A (en) * | 2021-12-31 | 2022-04-12 | 深圳市汇川技术股份有限公司 | Motor flux weakening prevention regulation and control method, device, equipment and storage medium |
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