CN107346951B - Weak magnetic control method and device for permanent magnet synchronous motor system - Google Patents
Weak magnetic control method and device for permanent magnet synchronous motor system Download PDFInfo
- Publication number
- CN107346951B CN107346951B CN201710532291.2A CN201710532291A CN107346951B CN 107346951 B CN107346951 B CN 107346951B CN 201710532291 A CN201710532291 A CN 201710532291A CN 107346951 B CN107346951 B CN 107346951B
- Authority
- CN
- China
- Prior art keywords
- time
- permanent magnet
- synchronous motor
- magnet synchronous
- motor system
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000003313 weakening effect Effects 0.000 claims abstract description 90
- 239000013598 vector Substances 0.000 claims abstract description 87
- 230000004907 flux Effects 0.000 claims abstract description 39
- 230000009466 transformation Effects 0.000 claims description 6
- 238000005070 sampling Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000013507 mapping Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
- 238000011426 transformation method Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Images
Classifications
-
- 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
- H02P21/0085—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation specially adapted for high speeds, e.g. above nominal speed
- H02P21/0089—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation specially adapted for high speeds, e.g. above nominal speed using field weakening
-
- 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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
- H02P25/024—Synchronous motors controlled by supply frequency
-
- 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
- H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
- H02P2207/05—Synchronous machines, e.g. with permanent magnets or DC excitation
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The embodiment of the invention provides a flux weakening control method and device for a permanent magnet synchronous motor system, and belongs to the field of permanent magnet synchronous motor control. The flux weakening control method of the permanent magnet synchronous motor system comprises the following steps: acquiring a first time and a second time which are respectively acted by a first basic voltage vector and a second basic voltage vector of the permanent magnet synchronous motor system under a vector control period, wherein the expected output voltage can be determined based on the first basic voltage vector, the second basic voltage vector, the first time and the second time; acquiring third time acted by the permanent magnet synchronous motor system under a zero vector, and determining reference time related to weak magnetic current based on a PWM (pulse width modulation) period and the third time; and determining the magnitude of the flux weakening current based on the reference time, the first time and the second time so that the permanent magnet synchronous motor system performs flux weakening control according to the flux weakening current. Therefore, the voltage vector modulation range of the permanent magnet synchronous motor system is effectively enlarged, and the embodiment of the invention is easy to implement.
Description
Technical Field
The invention relates to the field of motor control, in particular to a flux weakening control method and device of a permanent magnet synchronous motor system.
Background
Permanent magnet synchronous motors have been widely used in various industries due to their characteristics of good control performance, high power density, energy saving, etc. In many applications, the permanent magnet synchronous motor is required to be capable of operating in a high-speed range, and then flux weakening control needs to be performed on the motor.
The field weakening control method of the permanent magnet synchronous motor system in the related technology is mostly based on a linear modulation region, and the field weakening control method cannot meet a plurality of application occasions needing deep field weakening.
Disclosure of Invention
The embodiment of the invention aims to provide a method and a device for flux weakening control of a permanent magnet synchronous motor system, and provides a brand-new flux weakening control scheme to at least solve the technical problems that flux weakening control in the prior art is based on a linear modulation region and the application range is limited.
In order to achieve the above object, an embodiment of the present invention provides a field weakening control method for a permanent magnet synchronous motor system, where the permanent magnet synchronous motor system is configured with a vector control period and a PWM period, the method including: acquiring a first time and a second time during which the permanent magnet synchronous motor system is respectively acted on by a first basic voltage vector and a second basic voltage vector under the vector control period, wherein a desired output voltage can be determined based on the first basic voltage vector, the second basic voltage vector, the first time and the second time; acquiring third time acted by the permanent magnet synchronous motor system under a zero vector, and determining reference time related to weak magnetic current based on the PWM period and the third time; and determining the magnitude of the flux weakening current based on the reference time, the first time and the second time so as to enable the permanent magnet synchronous motor system to perform flux weakening control according to the flux weakening current.
Optionally, the determining the magnitude of the field weakening current based on the reference time, the first time and the second time includes: inputting the first time, the second time and the reference time to a preset PI control model to determine the magnitude of the field weakening current.
Optionally, the determining the reference time for the weak magnetic current based on the PWM period and the third time includes: determining a difference between the PWM cycle and the third time as the reference time.
Optionally, inputting the first time, the second time and the reference time to a preset PI control model to determine the magnitude of the field weakening current includes: and determining the sum of the first time and the second time, and performing PI transformation conforming to the preset PI control model on the difference value obtained by subtracting the reference time from the sum of the first time and the second time to determine the magnitude of the weak magnetic current.
Optionally, the determining the magnitude of the field weakening current based on the reference time, the first time and the second time includes: and amplitude limiting is carried out on the magnitude of the weak magnetic current based on a preset weak magnetic current threshold value, so that the permanent magnet synchronous motor system carries out weak magnetic control according to the limited weak magnetic current.
Optionally, the determining the magnitude of the field weakening current based on the reference time, the first time and the second time includes: determining a q-axis threshold of the stator current based on a preset output current threshold and the amplitude of the weak magnetic current after amplitude limiting; and acquiring the magnitude of the q-axis component of the stator current, and carrying out amplitude limiting on the magnitude of the acquired q-axis component of the stator current by using a q-axis threshold of the stator current.
Another aspect of an embodiment of the present invention provides a flux weakening control apparatus for a permanent magnet synchronous motor system, where the permanent magnet synchronous motor system is configured with a vector control period and a PWM period, and the apparatus includes: a vector time acquisition unit for acquiring a first time and a second time at which the permanent magnet synchronous motor system is acted on by a first basic voltage vector and a second basic voltage vector, respectively, in the vector control cycle, wherein a desired output voltage can be determined based on the first basic voltage vector, the second basic voltage vector, the first time and the second time; the field weakening time determining unit is used for acquiring third time acted by the permanent magnet synchronous motor system under a zero vector and determining reference time related to field weakening current based on the PWM period and the third time; and the weak magnetic magnitude determining unit is used for determining the magnitude of the weak magnetic current based on the reference time, the first time and the second time so as to enable the permanent magnet synchronous motor system to carry out weak magnetic control according to the weak magnetic current.
Optionally, the flux weakening current size determining unit is configured to input the first time, the second time and the reference time into a preset PI control model to determine the size of the flux weakening current.
Optionally, the field weakening time determination unit is configured to determine a difference between the PWM period and the third time as the reference time.
Optionally, the flux weakening magnitude determining unit is configured to determine a sum of the first time and the second time, and perform PI transformation conforming to the preset PI control model on a difference obtained by subtracting the reference time from the sum of the first time and the second time to determine the magnitude of the flux weakening current.
Optionally, the flux weakening size determining unit is configured to perform amplitude limiting on the size of the flux weakening current based on a preset flux weakening current threshold, so that the permanent magnet synchronous motor system performs flux weakening control according to the flux weakening current after amplitude limiting.
Optionally, the flux weakening size determining unit includes: the q-axis threshold determining module is used for determining a q-axis threshold of the stator current based on a preset output current threshold and the amplitude-limited weak magnetic current; the q-axis current acquisition module is used for acquiring the magnitude of a q-axis component of the stator current; and the q-axis current amplitude limiting module is used for carrying out amplitude limiting on the obtained q-axis component of the stator current by using the q-axis threshold of the stator current.
In a further aspect, an embodiment of the present invention provides a permanent magnet synchronous motor system, including a field weakening control device of the permanent magnet synchronous motor system according to the claims.
According to the technical scheme, the reference time of the action of the weak magnetic current is determined by utilizing the first time and the second time corresponding to the expected output voltage, and the magnitude of the weak magnetic current is determined by utilizing the reference time, so that the modulation of the motor system is not only linear voltage vector modulation, and the synthesized expected voltage output can be expanded from a circle to a regular hexagon, thereby effectively enlarging the voltage vector modulation range of the permanent magnet synchronous motor system and having a wider application range; in addition, the parameters selected in the embodiment of the invention are easy to obtain, and extra calculation is not needed, so that the embodiment of the invention is easy to implement and can effectively improve the real-time response efficiency of the weak magnetic current.
Additional features and advantages of embodiments of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the embodiments of the invention without limiting the embodiments of the invention. In the drawings:
fig. 1 is a schematic flow chart of a flux weakening control method of a permanent magnet synchronous motor system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a flux weakening control method of a permanent magnet synchronous motor system according to another embodiment of the present invention;
fig. 3 shows a schematic view of the weak magnetic control method of the permanent magnet synchronous motor system shown in fig. 2;
fig. 4 is a schematic structural diagram of a field weakening control device of a permanent magnet synchronous motor system according to an embodiment of the present invention.
Description of the reference numerals
30 flux weakening control device 301 vector time acquisition unit
302 flux weakening time determination unit 303 flux weakening size determination unit
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
Referring to fig. 1, a flow chart of a field weakening control method of a permanent magnet synchronous motor system configured with a vector control period and a PWM period according to an embodiment of the present invention is shown, and for the explanation of the vector control period and the PWM period, reference may be made to the description in the related art, and more specifically, the vector control of the permanent magnet synchronous motor system is implemented based on the PWM technique, so the vector control period may be generally an integer multiple of the PWM period. As shown in fig. 1, the method specifically includes the following steps:
step 101: acquiring a first time and a second time which are respectively acted by a first basic voltage vector and a second basic voltage vector of the permanent magnet synchronous motor system under a vector control period, wherein the expected output voltage can be determined based on the first basic voltage vector, the second basic voltage vector, the first time and the second time;
it should be noted that, in the present PWM inverter implementing vector control of the permanent magnet synchronous motor system, there are 8 operating states, and there are 6 effective operating vectors (i.e. basic voltage vectors) and 2 zero vectors, respectively, and thus the vector control is divided into 6 sectors, and generally, the desired output voltage can be obtained by synthesizing in the sector area based on the time when two adjacent basic voltage vectors act respectively, but the above description is merely an example, and should not be taken as a limitation to the present embodiment, and for example, the desired output voltage may also be synthesized by using two basic voltage vectors which are spaced apart.
Step 102: acquiring third time acted by the permanent magnet synchronous motor system under a zero vector, and determining reference time related to weak magnetic current based on a PWM (pulse width modulation) period and the third time;
as an example, the difference between the PWM period and the third time may be determined as the reference time, and it is understood that the result obtained by transforming the PWM period and the third time by other mathematical transformation methods, such as multiplication, division, etc., may also be used as the reference time, and all fall within the scope of the embodiments of the present invention. It can be understood that the larger the time acted by the zero vector is, the longer the stay time of the stator flux linkage vector track is, so that the insertion of the zero vector can effectively solve the contradiction between the amplitude of the stator flux linkage vector and the rotating speed; also, if the current/voltage signal is sampled at the zero vector, it is generally required that the third time at which the zero vector acts should be not less than the minimum time for signal sampling.
Step 103: and determining the magnitude of the weak magnetic current based on the reference time, the first time and the second time so as to enable the permanent magnet synchronous motor system to perform weak magnetic control according to the weak magnetic current.
In the embodiment of the invention, the reference time for the weak magnetic current to act is determined by utilizing the first time and the second time corresponding to the expected output voltage, and the magnitude of the weak magnetic current is determined by utilizing the reference time, so that the modulation on the motor system is not only linear voltage vector modulation, and the synthesized expected voltage output can be expanded from a circle to a regular hexagon, thereby effectively enlarging the voltage vector modulation range of the permanent magnet synchronous motor system; in addition, the parameters selected in the embodiment of the invention are easy to obtain, for example, the first time and the second time can be obtained by real-time acquisition and detection, and the third time and the PWM period are generally fixed and unchanged under the condition that the PWM control mode is determined, so that extra calculation is not needed, and the real-time response efficiency of the weak magnetic current can be effectively improved; in addition, compared with the scheme of utilizing the amplitude of the expected synthetic voltage as a feedback quantity and performing table look-up and other operations based on the voltage to perform field weakening control in the related art, the embodiment of the invention does not need to determine the expected synthetic voltage or utilize the amplitude of the voltage as the feedback quantity, greatly improves the field weakening control efficiency, and provides a brand-new, rapid and stable field weakening control scheme of the permanent magnet synchronous motor system.
As a further disclosure and optimization of step 103 shown in fig. 1, the first time, the second time and the reference time may be input into a preset PI control model to determine the magnitude of the field weakening current; more specifically, the preset PI control model may reflect correspondence, such as a functional relationship, a mapping relationship, and the like, between the magnitude of the weak magnetic current and the first time, the second time, and the reference time, and due to a PI modulation function of the PI control model, feedback modulation may be made in real time based on a change of an input parameter, which can guarantee the accuracy of the determined weak magnetic current. More specifically, the sum of the first time and the second time may be calculated, and a PI transformation conforming to the preset PI control model is performed on a difference obtained by subtracting the reference time from the sum of the first time and the second time to determine the magnitude of the weak magnetic current, so that the difference between the sum of the first time and the second time and the reference time is used as a reference for the PI transformation, and the magnitude of the weak magnetic current can be obtained accurately.
Referring to fig. 2, a schematic flow chart of a flux weakening control method of a permanent magnet synchronous motor system according to another embodiment of the present invention is shown, where the method specifically includes:
step 201: acquiring two basic voltage vectors of a permanent magnet synchronous motor system in a vector control period
(for example, k may be selected from any two of 1 to 6) respectively1And a second time T2Wherein is based on
T1And T2A desired output voltage can be determined;
step 202: acquiring the third time T acted by the permanent magnet synchronous motor system under the zero vector3Let reference time T of weak magnetic currentref＝TPWM-T3Wherein T isPWMIs a PWM period;
step 203: will TrefAnd T1+T2Inputting the d-axis component of the stator current to a negative feedback PI regulator, obtaining the d-axis component of the negative stator current after PI conversion of the negative feedback PI regulator, and determining the d-axis component of the obtained stator current as weak magnetic current Idref；
Step 204: based on preset weak magnetic current threshold Idmax/IdminTo IdrefClipping is performed, i.e. it is required to satisfy Idmin≤Idref≤IdmaxUsing limited IdrefTogether with TrefImplementing weak magnetic control;
the normal operation of the motor system needs to be at a certain output current threshold IsmaxWorking in order to prevent the resultant total current IsOver IsmaxTo ensure the safe operation of the system, the following steps 205 and 206 may also be performed.
Step 205: based on IsmaxAnd the weak magnetic current after amplitude limitingSize I ofdrefDetermining a q-axis threshold I of a stator currentqmaxAnd Iqmin；
More specifically, I may be determined in the following mannerqmaxAnd Iqmin：
Step 206: detecting q-axis component I of stator currentqrefBy size of (1), and use ofqmaxAnd IqminTo IqrefAnd amplitude limiting is carried out to ensure the safe operation of the motor system.
In the embodiment, all the parameters are acquired in real time or simply calculated, a fixed table and a table look-up are not required to be set, approximate static open-loop control is not required to be utilized, and the method has the advantages of being easy to implement, wide in applicability and capable of responding to closed-loop flux weakening control in real time.
More specifically, a schematic diagram of the weak magnetic control method of the permanent magnet synchronous motor system shown in fig. 2 is shown in conjunction with fig. 3. As shown in FIG. 3, the time T of two basic voltage vectors in each vector control period is obtained1And T2In the process of implementing vector control of the permanent magnet synchronous motor, the time T of two basic voltage vectors needs to be calculated1And T2To obtain the desired output voltage, thus T1And T2The method can be directly obtained without adding extra calculation. Then, according to the PWM period TPWMAnd zero vector time T3Obtaining a reference time TrefWherein T isrefIs equal to TPWM-T3(ii) a Wherein, TPWMIn vector control, the sampling of signals such as voltage and current is generally performed at the zero vector, which is determined by the PWM carrier frequency, and therefore the minimum zero vector time should be not less than the minimum time for satisfying the signal sampling. Then, T is put1+T2And TrefComparing, finally obtaining negative I by negative feedback PI regulatordrefAnd according to Idmax/IdminTo IdrefPerforming clipping and using the IdrefAnd carrying out field weakening control. Finally, root ofAccording to IsmaxAnd IdrefTo obtain IqrefIs limited byqmin/IqmaxTo ensure that the total current synthesized does not exceed Ismax。
Referring to fig. 4, which is a schematic structural diagram of a field weakening control device of a permanent magnet synchronous motor system according to an embodiment of the present invention, as shown in fig. 4, a vector time acquisition unit 301, a field weakening time determination unit 302, and a field weakening size determination unit 303 connected to the vector time acquisition unit 301 and the field weakening time determination unit 302 are provided in the field weakening control device 30. More specifically, the vector time acquisition unit 301 may be configured to acquire a first time and a second time at which the permanent magnet synchronous motor system is acted upon by the first basic voltage vector and the second basic voltage vector, respectively, under the vector control cycle, wherein the desired output voltage can be determined based on the first basic voltage vector, the second basic voltage vector, the first time, and the second time; the field weakening time determination unit 302 can be used for acquiring a third time acted by the permanent magnet synchronous motor system under a zero vector, and determining a reference time related to field weakening current based on the PWM period and the third time; and the field weakening magnitude determination unit 303 may be configured to determine the magnitude of the field weakening current based on the reference time, the first time, and the second time, so that the permanent magnet synchronous motor system performs field weakening control according to the field weakening current.
For further details of the device according to the embodiment of the present invention, reference may be made to the above description of the method embodiment, and the same contents are not described herein again.
In another aspect, the present invention provides a permanent magnet synchronous motor system, in which the flux weakening control device is disposed, so that the permanent magnet synchronous motor system can have corresponding functions and effects of the control device.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
In addition, any combination of various different implementation manners of the embodiments of the present invention is also possible, and the embodiments of the present invention should be considered as disclosed in the embodiments of the present invention as long as the combination does not depart from the spirit of the embodiments of the present invention.
Claims (9)
1. A flux weakening control method of a permanent magnet synchronous motor system is characterized in that the permanent magnet synchronous motor system is configured with a vector control period and a PWM period, and the method comprises the following steps:
acquiring a first time and a second time during which the permanent magnet synchronous motor system is respectively acted on by a first basic voltage vector and a second basic voltage vector under the vector control period, wherein a desired output voltage can be determined based on the first basic voltage vector, the second basic voltage vector, the first time and the second time;
acquiring a third time acted by the permanent magnet synchronous motor system under a zero vector, and determining a reference time related to weak magnetic current based on the PWM period and the third time, wherein the determining the reference time related to weak magnetic current based on the PWM period and the third time comprises the following steps: determining a difference between the PWM cycle and the third time as the reference time; the third time at which the zero vector is applied should be no less than the minimum time of signal sampling; and
inputting the first time, the second time and the reference time into a preset PI control model to determine the magnitude of the flux weakening current so that the permanent magnet synchronous motor system performs flux weakening control according to the flux weakening current, wherein the PI control model comprises corresponding relations between the magnitude of the flux weakening current and the first time, the second time and the reference time.
2. The field weakening control method of a permanent magnet synchronous motor system according to claim 1, wherein inputting the first time, the second time and the reference time to a preset PI control model to determine the magnitude of the field weakening current comprises:
and determining the sum of the first time and the second time, and performing PI transformation conforming to the preset PI control model on the difference value obtained by subtracting the reference time from the sum of the first time and the second time to determine the magnitude of the weak magnetic current.
3. The field weakening control method of a permanent magnet synchronous motor system according to claim 2, wherein said determining the magnitude of the field weakening current based on the reference time, the first time and the second time comprises:
and amplitude limiting is carried out on the magnitude of the weak magnetic current based on a preset weak magnetic current threshold value, so that the permanent magnet synchronous motor system carries out weak magnetic control according to the limited weak magnetic current.
4. The field weakening control method of a permanent magnet synchronous motor system according to claim 3, wherein said determining the magnitude of the field weakening current based on the reference time, the first time and the second time comprises:
determining a q-axis threshold of the stator current based on a preset output current threshold and the amplitude of the weak magnetic current after amplitude limiting; and
and obtaining the magnitude of the q-axis component of the stator current, and carrying out amplitude limiting on the magnitude of the obtained q-axis component of the stator current by using a q-axis threshold of the stator current.
5. A field weakening control apparatus of a permanent magnet synchronous motor system, wherein the permanent magnet synchronous motor system is configured with a vector control period and a PWM period, wherein the apparatus comprises:
a vector time acquisition unit for acquiring a first time and a second time at which the permanent magnet synchronous motor system is acted on by a first basic voltage vector and a second basic voltage vector, respectively, in the vector control cycle, wherein a desired output voltage can be determined based on the first basic voltage vector, the second basic voltage vector, the first time and the second time;
a field weakening time determination unit for obtaining a third time that the permanent magnet synchronous motor system acts under a zero vector, and determining a reference time for field weakening current based on the PWM cycle and the third time, wherein the determining the reference time for field weakening current based on the PWM cycle and the third time comprises: determining a difference between the PWM cycle and the third time as the reference time; the third time at which the zero vector is applied should be no less than the minimum time of signal sampling;
and the weak magnetic magnitude determining unit is used for inputting the first time, the second time and the reference time into a preset PI control model to determine the magnitude of the weak magnetic current so as to enable the permanent magnet synchronous motor system to carry out weak magnetic control according to the weak magnetic current, wherein the PI control model comprises corresponding relations between the magnitude of the weak magnetic current and the first time, the second time and the reference time.
6. The field weakening control device of a permanent magnet synchronous motor system according to claim 5, wherein the field weakening magnitude determination unit is configured to determine a sum of the first time and the second time, and perform a PI transformation conforming to the preset PI control model on a difference obtained by subtracting the reference time from the sum of the first time and the second time to determine the magnitude of the field weakening current.
7. The field weakening control device of the permanent magnet synchronous motor system according to claim 6, wherein the field weakening size determining unit is configured to clip the size of the field weakening current based on a preset field weakening current threshold value, so that the permanent magnet synchronous motor system performs field weakening control according to the clipped field weakening current.
8. The field weakening control device of a permanent magnet synchronous motor system as claimed in claim 7, wherein said field weakening size determining unit comprises:
the q-axis threshold determining module is used for determining a q-axis threshold of the stator current based on a preset output current threshold and the amplitude-limited weak magnetic current;
the q-axis current acquisition module is used for acquiring the magnitude of a q-axis component of the stator current;
and the q-axis current amplitude limiting module is used for carrying out amplitude limiting on the obtained q-axis component of the stator current by using the q-axis threshold of the stator current.
9. A permanent magnet synchronous motor system, characterized in that it comprises a field weakening control device of a permanent magnet synchronous motor system according to any of the claims 5-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710532291.2A CN107346951B (en) | 2017-07-03 | 2017-07-03 | Weak magnetic control method and device for permanent magnet synchronous motor system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710532291.2A CN107346951B (en) | 2017-07-03 | 2017-07-03 | Weak magnetic control method and device for permanent magnet synchronous motor system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107346951A CN107346951A (en) | 2017-11-14 |
| CN107346951B true CN107346951B (en) | 2020-06-30 |
Family
ID=60256688
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710532291.2A Active CN107346951B (en) | 2017-07-03 | 2017-07-03 | Weak magnetic control method and device for permanent magnet synchronous motor system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107346951B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109687791A (en) * | 2019-01-23 | 2019-04-26 | 广东工业大学 | The control method of torque pulsation when a kind of reduction asynchronous machine weak magnetic field operation |
| CN112491320A (en) * | 2020-11-19 | 2021-03-12 | 杭州海康威视数字技术股份有限公司 | Method and system for determining switching time by motor-driven mechanism |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000156993A (en) * | 1998-11-18 | 2000-06-06 | Hitachi Ltd | Control device and control method for permanent magnet type synchronous machine |
| CN104753418A (en) * | 2015-03-19 | 2015-07-01 | 浙江大学 | Voltage cutting method based weak magnet method for low-switch-loss open-winding permanent synchronizing motor system |
-
2017
- 2017-07-03 CN CN201710532291.2A patent/CN107346951B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000156993A (en) * | 1998-11-18 | 2000-06-06 | Hitachi Ltd | Control device and control method for permanent magnet type synchronous machine |
| CN104753418A (en) * | 2015-03-19 | 2015-07-01 | 浙江大学 | Voltage cutting method based weak magnet method for low-switch-loss open-winding permanent synchronizing motor system |
Non-Patent Citations (1)
| Title |
|---|
| 《Voltage Control Technique for the Extension of DC-Link Voltage Utilization ofFinite-Speed SPMSM Drives 》;Ping-Yi Lin，Yen-Shin Lai;《IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS》;20121231;3392-3401 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107346951A (en) | 2017-11-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR101993379B1 (en) | Method and Apparatus for controlling output voltage of inverter driving motor | |
| CN100468946C (en) | Lead angle control method and device for permanent magnet synchronous motor operating in field weakening area | |
| CN110289792B (en) | Calibration method, control method and bench test control system of permanent magnet synchronous motor | |
| Ramasamy et al. | Direct‐drive low‐speed wind energy conversion system incorporating axial‐type permanent magnet generator and Z‐source inverter with sensorless maximum power point tracking controller | |
| US11522480B2 (en) | SPMSM sensorless composite control method with dual sliding-mode observers | |
| JP2006353091A (en) | On-line minimum copper loss control of embedded permanent magnet synchronous machine for vehicle | |
| EP2736164B1 (en) | Method for efficiency optimization of a wind generator by controlling the electrical generator and system therefor | |
| CN106788041B (en) | A kind of stator permanent magnetic type memory electrical machine high efficiency and wide speed regulation control method | |
| CN113241986B (en) | Motor control method, control system and storage medium | |
| CN107046386A (en) | A new method for field-weakening calibration of permanent magnet synchronous motor controllers for pure electric vehicles | |
| CN105207544A (en) | Flux-weakening control method and flux-weakening control device | |
| CN111682814B (en) | Method and device for determining external characteristic parameters of motor system, electronic equipment and medium | |
| CN103904972A (en) | Novel fuzzy and deadbeat algorithm vector control system of permanent magnet synchronous motor | |
| EP3070836A1 (en) | Methods of auto tuning machine parameters and systems thereof | |
| CN107346951B (en) | Weak magnetic control method and device for permanent magnet synchronous motor system | |
| Anwer et al. | Sensorless control of a PMSM drive using EKF for wide speed range supplied by MPPT based solar PV system | |
| CN107370430B (en) | Control method and device of permanent magnet synchronous motor system | |
| KR102443690B1 (en) | Mtpa control method of permanent magnet synchronous motor using optimization technique | |
| Mao et al. | Dual quasi-resonant controller position observer based on high frequency pulse voltage injection method | |
| CN107959456A (en) | A kind of permanent magnet synchronous motor control strategy of electric automobile | |
| CN104953910A (en) | Permanent magnet synchronous motor as well as control method and device thereof | |
| KR101326494B1 (en) | Method for reducing conduction loss of IGBT for converting voltage modulation of inverter | |
| CN104253543A (en) | Oriented vector control method for virtual power grid magnetic flux linkage | |
| CN107241043B (en) | Control method and device of permanent magnet synchronous motor system | |
| CN107241044B (en) | Control method and device of permanent magnet synchronous motor system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |