CN109067288B - Motor control method and device based on current loop - Google Patents
Motor control method and device based on current loop Download PDFInfo
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- CN109067288B CN109067288B CN201810928703.9A CN201810928703A CN109067288B CN 109067288 B CN109067288 B CN 109067288B CN 201810928703 A CN201810928703 A CN 201810928703A CN 109067288 B CN109067288 B CN 109067288B
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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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/22—Current control, e.g. using a current control loop
Abstract
The invention relates to a motor control method and a device based on a current loop, wherein the method comprises the following steps: s11, processing the speed difference between the input command speed and the motor feedback speed by a speed loop PID processing module to obtain a command current value; s12, processing the instruction current value through the feedforward unit with the determined delay configuration, and then performing difference processing on the instruction current value and the acquired vector current value to obtain a current difference value, and then processing the current difference value through a current loop PID processing module to obtain a voltage component; and S13, based on the current differential result obtained by the differential processing module based on the instruction current value and the voltage component obtained by the current loop PID processing module, the vector voltage calculation module is used for vector voltage calculation. The device comprises a memory, a processor and a micro-computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the method.
Description
Technical Field
The invention relates to a motor control method and device based on a current loop, and belongs to the field of motor electrical control.
Background
Today's closed-loop automatic control techniques are based on feedback to reduce uncertainty. The elements of the feedback theory include three parts: measuring, comparing and executing. What is essential to the measurement is the actual value of the controlled variable, which is compared with the desired value, and this deviation is used to correct the response of the system and to perform the regulation control. In engineering practice, the most widely used PID controller (proportional-integral-derivative controller) consists of a proportional unit P, an integral unit I and a derivative unit D. The basis of PID control is proportional control; integral control may eliminate steady state errors, but may increase overshoot; differential control can accelerate the response speed of the large inertia system and weaken the overshoot tendency.
A classical servo motor control loop is shown in fig. 1, with the sampling/input end on the left and the control output end on the right of the control path. The motor current sampling, the motor position sensor (encoder) position sampling and the command parameters of path planning calculation are used as the input of the control loop. The command speed is generally obtained by a command parameter, combining the feedback current and the feedback speed of the motor, and processing the obtained driving voltage by the current loop and the speed loop to drive the motor to perform the desired steering and rotation amount. Fig. 2 is a schematic diagram showing a determined delay between current sampling and control output in a conventional motor servo control system. It can be seen that in the 3 rd calculation cycle, the obtained sampling data is the result of the 1 st calculation cycle, and an error of 2 cycles exists in the middle. Therefore, a better motor control scheme can be obtained by the determined control delay time.
Disclosure of Invention
The invention provides a motor control method and device based on a current loop.
A first aspect of the technical solution of the present invention is a motor current loop control method based on a determination delay between current sampling and control output, the method including the steps of:
s11, processing the speed difference between the input command speed and the motor feedback speed by a speed loop PID processing module to obtain a command current value;
s12, processing the instruction current value through the feedforward unit with the determined delay configuration, and then performing difference processing on the instruction current value and the acquired vector current value to obtain a current difference value, and then processing the current difference value through a current loop PID processing module to obtain a voltage component;
and S13, based on the current differential result obtained by the differential processing module based on the instruction current value and the voltage component obtained by the current loop PID processing module, the vector voltage calculation module is used for vector voltage calculation.
Further, the step S12 includes: and sequentially carrying out Z inverse transformation twice on the command current value processed by the feedforward unit, and then subtracting the vector current from the transformed current value to obtain a current difference value.
Further, the step S13 includes: and processing the original instruction current value and the instruction current value subjected to the Z inverse transformation together by a differential processing module to obtain a current differential result value.
Further, the step S13 further includes: and processing the instruction current value by a differential processing module, processing the instruction current value by a current loop PID processing module, and transmitting the obtained result value and the voltage component obtained by the current loop PID processing module to a vector voltage calculation module for vector voltage calculation.
A second aspect of the present invention is a motor control method, including the steps of:
A. sampling motor current, and then sequentially carrying out CLARK conversion and PARK conversion on the collected feedback current to obtain vector current;
B. the position sampling is carried out on the motor through an encoder, the feedback position of the motor is obtained, and the feedback speed of the motor is obtained through calculation;
C. calculating a speed input parameter of the motor based on the path planning;
D. performing PID control based on the command speed and the converted command current;
E. calculating vector voltage through output voltage component of current loop PID processing module and output quantity of speed loop PID processing module, and outputting three-phase voltage for controlling motor after IPARK conversion and ICLARK conversion in sequence,
wherein, the above method is also executed in the step D.
Further, the step a further comprises the following step of sampling the motor current:
s41, initiating one or more samples at one or more preset moments according to one control period of the motor;
s42, advancing a preset time at each moment of initiating sampling, and respectively capturing motor current data;
and S43, calculating the average current value of the motor current data captured in the control period.
Further, in the step D, the following steps are also performed: s21, performing first-order speed filtering on the motor feedback speed, and performing first-order speed filtering on the command speed; s22, performing difference operation on the original instruction speed and the instruction speed after first-order filtering, and performing summation operation on the result of the difference operation and the motor feedback speed of the first-order filtering to obtain a summation speed; and S23, performing difference operation on the summation speed and the original instruction speed, and transmitting the operation result to a speed loop PID processing module. When the feedback rotating speed of the motor is detected to be less than a speed threshold value, the feedback rotating speed of the motor is subjected to first-order speed filtering, and the command speed is subjected to first-order speed filtering, wherein the speed threshold value is less than or equal to 60 rpm.
A third aspect of the present invention is a micro-computing device, comprising a memory, a processor and a micro-computing program stored in the memory and capable of running on the processor, wherein the processor executes the program to implement the method.
The invention has the beneficial effects that: the existing servo motor control technology is improved; the feedforward unit is added in front of the current loop, so that the influence on the dynamic performance caused by the delay between the input signal sampling of the servo motor and the control output signal of the servo motor is reduced; under the same current gain parameter of the PID control unit, the overshoot of the motor control can be reduced.
Drawings
Fig. 1 shows a classical servomotor control loop.
Fig. 2 is a schematic diagram showing the determined delay between current sampling and control output in a motor servo control system.
Fig. 3 is a block diagram illustrating a motor current loop based control method according to a first embodiment of the present invention.
Fig. 4 is a block diagram showing a motor control method according to a second embodiment of the present invention.
Fig. 5 is a schematic diagram illustrating a current sampling method according to a third embodiment of the present invention.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the schemes and the effects of the present invention.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it may be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. Furthermore, the descriptions of upper, lower, left, right, etc. used in the present disclosure are only relative to the mutual positional relationship of the constituent parts of the present disclosure in the drawings. As used in this disclosure, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element of the same type from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. The use of any and all examples, or exemplary language ("e.g.," such as "or the like") provided herein, is intended merely to better illuminate embodiments of the invention and does not pose a limitation on the scope of the invention unless otherwise claimed.
Fig. 3 shows a motor current loop control method based on a determined delay between current sampling and control output according to the invention, comprising the steps of:
s11, processing the speed difference between the input command speed and the motor feedback speed by a speed loop PID processing module to obtain a command current value;
s12, processing the instruction current value through the feedforward unit with the determined delay configuration, and then performing difference processing on the instruction current value and the acquired vector current value to obtain a current difference value, and then processing the current difference value through a current loop PID processing module to obtain a voltage component;
and S13, based on the current differential result obtained by the differential processing module based on the instruction current value and the voltage component obtained by the current loop PID processing module, the vector voltage calculation module is used for vector voltage calculation.
In the step S12, the determination delay is, for example, twice the calculation period as shown in fig. 2. In the present embodiment, the feedforward control unit is configured to compensate for the time lag of the command current by the determined delay time; therefore, the overshoot of the motor response can be reduced under the same current gain. For example, in a control scenario of a three-phase motor, after actual motor control debugging, the overshoot is suppressed to 20%, the current gain Kp _ I must be reduced to 25%, and the overshoot can be reduced by 5% with the same current gain by using a feedforward unit.
Further, the step S12 includes: the command current value processed by the feedforward unit is subjected to Z inverse transformation (Z-1) twice in sequence, as shown in fig. 3, and then the vector current is subtracted from the transformed current value to obtain a current difference value.
Further, the step S13 includes: and processing the original instruction current value and the instruction current value subjected to the Z inverse transformation together by a differential processing module to obtain a current differential result value.
Further, the step S13 further includes: and processing the instruction current value by a differential processing module, processing the instruction current value by a current loop PID processing module, and transmitting the obtained result value and the voltage component obtained by the current loop PID processing module to a vector voltage calculation module for vector voltage calculation.
The invention further provides a motor control method, and based on the motor control method based on the current loop, the control overshoot of the motor is further reduced, and the dynamic response is improved.
The motor control method comprises the following steps:
A. sampling motor current, and then sequentially carrying out CLARK conversion and PARK conversion on the collected feedback current to obtain vector current;
B. the position sampling is carried out on the motor through an encoder, the feedback position of the motor is obtained, and the feedback speed of the motor is obtained through calculation;
C. calculating a speed input parameter of the motor based on the path planning;
D. performing PID control based on the command speed and the converted command current;
E. calculating vector voltage through output voltage component of current loop PID processing module and output quantity of speed loop PID processing module, and outputting three-phase voltage for controlling motor after IPARK conversion and ICLARK conversion in sequence,
in step a, referring to fig. 5, the following current sampling steps may be performed: s41, according to a control cycle of the motor, initiating one or more samples at one or more preset moments, preferably at least initiating the samples at the starting moment and the middle moment of the motor control cycle respectively; s42, advancing a preset time (at least less than one fourth of the control period) at each time of initiating sampling, and respectively capturing motor current data; and S43, calculating the average current value of the motor current data captured in the control period. Step S43 further includes: and carrying out interpolation on a plurality of average current values obtained by calculation of a plurality of control periods according to a time dimension to obtain a continuous current sampling value curve along the time dimension. In this way, the current value corresponding to continuous time can be estimated as the feedback current input value of the electromechanical closed-loop control through the current value sampled and calculated at discrete time. In a further embodiment, the motor current sampling method further comprises the steps of: and detecting the slope jump value of the current sampling value curve in a time range at intervals, and if the slope jump value exceeds a threshold (for example, 20%), adjusting the preset time T. In a further embodiment, the motor current sampling method further comprises the steps of: and judging whether the jitter value among the calculated average current values of the plurality of control periods exceeds a current jitter threshold value at intervals, and if so, adjusting the preset time T. In a further embodiment, the motor current sampling method further comprises the steps of: and setting and adjusting the preset time T to enable the jitter value between the average current values of a plurality of subsequent control periods to be smaller than a preset current jitter threshold value. This tuning approach is similar to parameter tuning in PID control. For example, the preset time T may be continuously adjusted within a certain range, then the jitter values between the collected and calculated average current values are counted, and the corresponding preset time T with the smallest jitter value is selected as the specific preset time Tx value of the current application scenario; the Tx value is subsequently used for motor current sampling.
In step C, the following path planning method steps can be performed: s51, judging whether the distance between the target point and the current position is greater than a preset threshold value; s52, if the distance is greater thanIf the threshold value is not reached, planning and inputting the motor instruction speed in a speed pure proportion tracking mode; and S53, limiting the acceleration of the command speed to ensure that the overshoot in the servo motor control process does not exceed 20%. The threshold value is the distance to which the rated rotating speed of the motor can move in one control period of the servo control system. In step S52, the target velocity planned by the triangular uniform acceleration method is calculated by the following formula
Wherein S is the distance between the target point and the current position, a is the maximum allowable acceleration, and t is the time constant required by the current position to the position corner. In step S52, the calculation formula of the planned target speed through speed pure proportional tracking is Vmax ═ S/t, where S is the distance between the target point and the current position, and t is the time constant required by the current position to reach the corner. The step S53 further includes: the motor command speed is calculated in a time discretization mode, and the acceleration of the command speed calculated in each discretization time period is enabled not to exceed the maximum allowable acceleration of a motor servo control system. Further, the formula for calculating the motor command speed by means of time discretization is V1 ═ V0+ limit (V max-V0, a × dT), where V0 is the current motor speed, dT is the discretization time, Vmax is the target speed, a is the maximum allowable acceleration, and limit in the formula is a discrete saturation calculation function for making the discrete incremental slope between Vmax and V0 not exceed a.
Steps S11 to S13 are performed in step D. Further, in step D, as shown in fig. 4, the following steps may also be performed: s21, performing first-order speed filtering on the motor feedback speed, and performing first-order speed filtering on the command speed; s22, performing difference operation on the original instruction speed and the instruction speed after first-order filtering, and performing summation operation on the result of the difference operation and the motor feedback speed of the first-order filtering to obtain a summation speed; and S23, performing difference operation on the summation speed and the original instruction speed, and transmitting the operation result to a speed loop PID processing module. The step S21 includes: when the feedback rotating speed of the motor is detected to be less than a speed threshold value, the feedback rotating speed of the motor is subjected to first-order speed filtering, and the command speed is subjected to first-order speed filtering, wherein the speed threshold value is less than or equal to 60 rpm.
It should be recognized that embodiments of the method of the present invention may be implemented or carried out by micro-computing hardware, a combination of hardware and software, or by micro-computing instructions stored in a non-transitory micro-computer readable memory. The micro-computing hardware can be industrial control elements and equipment such as a single chip microcomputer, an FPGA, a PLC and the like. The method may use standard programming techniques. Each program may be implemented in a high level procedural or object oriented programming language to communicate with a micro computing system. However, the program(s) can be implemented in assembly or machine language, if desired. In any case, the language may be a compiled or interpreted language. Furthermore, the program can be run on a programmed application specific integrated circuit for this purpose.
Further, the operations of processes described herein can be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by context. The processes described herein (or variations and/or combinations thereof) may be performed under the control of one or more micro-computing systems configured with executable instructions, and may be implemented by hardware or combinations thereof as code (e.g., executable instructions, one or more micro-computing programs, or one or more applications) that is executed collectively on one or more processors. The micro-computing program includes a plurality of instructions executable by one or more processors.
Further, the method may be implemented in any type of computing platform operatively connected to a suitable connection, including but not limited to a personal computer, mini-microcomputer, mainframe, workstation, networked or distributed computing environment, separate or integrated micro-computing platform, or in communication with a charged particle tool or other imaging device, and the like. Aspects of the invention may be implemented in machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optically read and/or write storage medium, RAM, ROM, etc., such that it is readable by a programmable microcomputer, which when read by the storage medium or device is operable to configure and operate the microcomputer to perform the processes described herein. Further, the machine-readable code, or portions thereof, may be transmitted over a wired or wireless network. The invention described herein includes these and other different types of non-transitory, microcomputer-readable storage media when such media include instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. The invention also includes the micro-computer itself when programmed according to the methods and techniques described herein.
The microcomputer program can be applied to input data to perform the functions described herein to convert the input data to generate output data that is stored to the non-volatile memory. The output information may also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including particular visual depictions of physical and tangible objects produced on a display.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means. The invention is capable of other modifications and variations in its technical solution and/or its implementation, within the scope of protection of the invention.
Claims (6)
1. A motor current loop control method based on a determined delay between current sampling and control output, the method comprising the steps of:
s11, processing the speed difference between the input command speed and the motor feedback speed by a speed loop PID processing module to obtain a command current value;
s12, according to a control cycle of the motor, one or more samples are initiated on the motor current at one or more preset moments, and the collected feedback current is subjected to CLARK conversion and PARK conversion in sequence to obtain vector current;
s13, processing the instruction current value through the feedforward unit with the determined delay configuration, and then performing difference processing on the instruction current value and the acquired vector current value to obtain a current difference value, and then processing the current difference value through a current loop PID processing module to obtain a voltage component;
s14, based on the current differential result obtained by the differential processing module based on the instruction current value and the voltage component obtained by the current loop PID processing module, the vector voltage calculation module is used for vector voltage calculation;
wherein the step S13 further includes:
sequentially carrying out Z inverse transformation processing twice on the instruction current value through a feedforward unit, and then subtracting vector current from the transformed current value to obtain a current difference value;
the step S14 further includes:
and processing the command current value and the command current value subjected to the Z inverse transformation together by a differential processing module to obtain a current differential result value, and then transmitting the obtained current differential result value and the voltage component obtained by the current loop PID processing module to a vector voltage calculation module for vector voltage calculation.
2. A motor control method, comprising the steps of:
A. sampling motor current, and then sequentially carrying out CLARK conversion and PARK conversion on the collected feedback current to obtain vector current;
B. the position sampling is carried out on the motor through an encoder, the feedback position of the motor is obtained, and the feedback speed of the motor is obtained through calculation;
C. calculating a speed input parameter of the motor based on the path planning;
D. carrying out PID control based on the instruction speed and the converted instruction current, and calculating vector voltage through the output voltage component of the current loop PID processing module and the output quantity of the speed loop PID processing module;
E. the vector voltage is sequentially subjected to IPARK conversion and ICLARK conversion, three-phase voltage for controlling the motor is output,
wherein the method of claim 1 is also performed in said step D;
wherein, the step A also comprises the following steps of sampling the current of the motor:
s41, initiating one or more samples at one or more preset moments according to one control period of the motor;
s42, advancing a preset time at each moment of initiating sampling, and respectively capturing motor current data;
s43, calculating the average current value of the motor current data captured in the control period, and interpolating a plurality of average current values obtained by calculation in a plurality of control periods according to the time dimension to obtain a continuous current sampling value curve along the time dimension;
wherein, the step A further comprises: detecting whether the slope jump value of the current sampling value curve in a time range exceeds a threshold value at intervals, and if so, adjusting the preset time; and judging whether the jitter values among the calculated average current values of the multiple control periods exceed a current jitter threshold value at intervals, if so, adjusting the preset time, counting the jitter values among the acquired and calculated average current values, selecting the corresponding preset time with the minimum jitter value as a specific preset time, and sampling the motor current by utilizing the specific preset time.
3. The motor control method according to claim 2, wherein the step D includes the steps of:
s21, performing first-order speed filtering on the motor feedback speed, and performing first-order speed filtering on the command speed;
s22, performing difference operation on the original instruction speed and the instruction speed after first-order filtering, and performing summation operation on the result of the difference operation and the motor feedback speed of the first-order filtering to obtain a summation speed;
and S23, performing difference operation on the summation speed and the original instruction speed, and transmitting the operation result to a speed loop PID processing module.
4. The motor control method according to claim 3, wherein the step S21 includes:
when the feedback rotating speed of the motor is detected to be less than a speed threshold value, the feedback rotating speed of the motor is subjected to first-order speed filtering, and the command speed is subjected to first-order speed filtering, wherein the speed threshold value is less than or equal to 60 rpm.
5. A micro-computing device comprising a memory, a processor and a micro-computing program stored on the memory and capable of running on the processor, wherein the processor when executing the program implements the method of any one of claims 1 to 4.
6. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 4.
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| CN101299591A (en) * | 2007-05-03 | 2008-11-05 | 通用汽车环球科技运作公司 | Method and system for motor control with delay compensation |
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