CN111262493A - Constant-power dust collector and motor control method thereof - Google Patents
Constant-power dust collector and motor control method thereof Download PDFInfo
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- CN111262493A CN111262493A CN202010098662.2A CN202010098662A CN111262493A CN 111262493 A CN111262493 A CN 111262493A CN 202010098662 A CN202010098662 A CN 202010098662A CN 111262493 A CN111262493 A CN 111262493A
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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
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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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
- H02P27/085—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation wherein the PWM mode is adapted on the running conditions of the motor, e.g. the switching frequency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Abstract
The invention relates to a constant-power dust collector and a motor control method thereof.
Description
Technical Field
The invention relates to the technical field of motor control for dust collectors, in particular to a constant-power dust collector and a motor control method thereof.
Background
When the conventional constant-power handheld dust collector is used for adjusting and controlling the power of a motor, various special devices (a motor special IC, a position sensor, a bus current detection device and the like) need to be carried to realize continuous control of the power, and the use of various devices leads to increase of the cost.
In addition, in the existing motor constant power control method, the excitation current (d-axis current) of the motor is not modulated, so that the power is saturated in advance when the motor runs at a high speed, namely the motor reaches rated power when the motor does not reach the highest rotating speed, so that the rotating speed cannot be further improved, and the output efficiency of the motor is influenced.
Disclosure of Invention
The invention aims to provide a constant-power dust collector and a motor control method thereof, and aims to solve the technical problems of high control cost and low motor output efficiency of the conventional motor.
In order to solve the technical problem, the invention provides a constant-power dust collector and a motor control method thereof.
A motor control method of a constant power dust collector comprises the following steps:
obtaining the q-axis and d-axis voltage values (Vq) of the motor in the previous control period[n-1]，Vd*[n-1]）；
Obtaining q-axis and d-axis current values (Iq) of the motor in the current control period[n]，Id[n]）；
According to the q-axis and d-axis voltage values (Vq) of the motor in the last control period[n-1]，Vd*[n-1]) And q-axis and d-axis current values (Iq) of the motor[n]，Id[n]) Obtaining the current power P of the motor[n]；
Obtaining a set power value P, and obtaining the current power P according to the set power P and the current power P[n]The difference value of (A) is used to obtain the command current I[n]；
According to a set advance angle phi and the command current I[n]Obtaining a q-axis command current value and a d-axis command current value (Iq) of the motor[n]，Id*[n]）；
According to the command current value (Iq;)[n],Id*[n]) And the detected current value (Iq)[n]，Id[n]) Obtaining a command voltage value (Vq;)[n],Vd*[n]）；
Will obtain the command voltage value (Vq;)[n],Vd*[n]) Conversion into three-phase command voltage values (Vu)[n]，Vv[n]，Vw[n]）；
According to three-phase command voltage value (Vu)[n]，Vv[n]，Vw[n]) And the DC bus voltage Vdc, calculatingAnd outputting a three-phase duty ratio signal, and transmitting the three-phase duty ratio signal to the motor according to the three-phase duty ratio signal.
The motor control method of the constant power dust collector,
obtaining q-axis and d-axis current values (Iq) of the motor in the current control period[n]，Id[n]) The method comprises the following steps:
detecting a three-phase current value (iu) of the motor[n]，iv[n]，iw[n]）；
The obtained three-phase current value (iu) of the motor[n]，iv[n]，iw[n]) Converted into a two-phase current value (Iq)[n]，Id[n]）。
The motor control method of the constant power dust collector,
P[n]= (Vq*[n-1]× Iq[n]) + (Vd*[n-1]× Id[n]）;
the motor control method of the constant power dust collector,
Iq*[n]= I*[n]× cosφ；
Id*[n]= I*[n]×（-sinφ）。
the motor control method of the constant power dust collector,
u-phase duty cycle = Vu ÷ Vdc;
v-phase duty cycle = Vv ÷ Vdc;
w-phase duty cycle = Vw ÷ Vdc.
A constant-power dust collector comprises a controller and a group of three-phase reversing circuits, wherein the controller controls a motor of the constant-power dust collector according to the control method.
The invention has the beneficial effects that: the motor control method of the constant-power dust collector realizes accurate regulation of the power of the motor by collecting the bus voltage and the three-phase current of the motor and modulating the currents of the d axis and the q axis, and can realize further improvement of the rotating speed under the control of the constant power, namely further improvement of the efficiency.
The constant-power dust collector can realize the control of the high rotating speed of the constant-power motor by using a controller and a three-phase commutation circuit as few as possible without using a special motor controller, a position sensor and other components.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic block diagram of a specific embodiment of the present invention.
FIG. 2 is a flow chart of an embodiment of the present invention.
Fig. 3 is a circuit diagram of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 and 2, the present embodiment provides a motor control method for a constant power vacuum cleaner:
a motor control method of a constant power dust collector comprises the following steps:
s1, obtaining the q-axis and d-axis voltage values (Vq) of the motor in the previous control period[n-1]，Vd*[n-1]）。
Specifically, it is obtained by steps S4-S6 in the previous cycle. First, the command current I in the previous cycle is obtained through S4 in the previous cycle[n-1];Then, the command current value (Iq) of the previous cycle is obtained through step S5 of the previous cycle[n-1]，Id*[n-1]) Finally, the last cycle of step S6 yields (Vq ×)[n-1]，Vd*[n-1]）。
S2, obtaining the q-axis and d-axis current values (Iq) of the motor in the current control period[n]，Id[n]）。
Obtaining q-axis and d-axis current values (Iq) of the motor in the current control period[n]，Id[n]) The method comprises the following steps:
detecting a three-phase current value (iu) of the motor[n]，iv[n]，iw[n]）；
Using the three-phase current value (iu) of the motor[n]，iv[n]，iw[n]) According to the rules of Clark conversion and Park conversion, the three-phase current value is subjected to rotation conversion to obtain q-axis and d-axis current values (Iq) under a two-phase coordinate system[n]，Id[n]）。
S3, according to the q-axis and d-axis voltage values (Vq) of the motor in the previous control period[n-1]，Vd*[n-1]) And q-axis and d-axis current values (Iq) of the motor[n]，Id[n]) Obtaining the current power P of the motor[n]。
P[n]= (Vq*[n-1]× Iq[n]) + (Vd*[n-1]× Id[n]）
S4, obtaining the setting power value P, according to the setting power P and the current power P[n]The difference value is subjected to PI regulation to obtain a command current I[n]。
S5, according to the set advance angle phi and the command current I[n]Obtaining a q-axis command current value and a d-axis command current value (Iq;) of the motor[n]，Id*[n]）；
Iq*[n]= I*[n]× cosφ；
Id*[n]= I*[n]×（-sinφ）；
S6, according to the command current value (Iq)[n],Id*[n]) And the detected current value (Iq)[n]，Id[n]) The difference values are respectively subjected to PI regulation to obtain command voltage values (Vq;)[n],Vd*[n]）。
S7And obtaining the command voltage value (Vq;)[n],Vd*[n]) According to the rule of 'reverse Clark conversion', the two-phase voltage value is subjected to rotation conversion to obtain a three-phase command voltage value (Vu) under a three-phase coordinate system[n]，Vv[n]，Vw[n]）。
S8, according to the three-phase command voltage value (Vu)[n]，Vv[n]，Vw[n]) And the direct current bus voltage Vdc is used for calculating a three-phase duty ratio signal and transmitting the three-phase duty ratio signal to the motor.
U-phase duty cycle = Vu ÷ Vdc;
v-phase duty cycle = Vv ÷ Vdc;
w-phase duty cycle = Vw ÷ Vdc.
As shown in fig. 3, this embodiment further provides a constant power vacuum cleaner, which is characterized by comprising a controller and a set of three-phase commutation circuits, wherein the controller controls a motor of the constant power vacuum cleaner according to the control method.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. A motor control method of a constant power dust collector is characterized by comprising the following steps:
obtaining the q-axis and d-axis voltage values (Vq) of the motor in the previous control period[n-1]，Vd*[n-1]）；
Obtaining q-axis and d-axis current values (Iq) of the motor in the current control period[n]，Id[n]）；
According to the q-axis and d-axis voltage values (Vq) of the motor in the last control period[n-1]，Vd*[n-1]) And q-axis and d-axis current values (Iq) of the motor[n]，Id[n]) Obtaining the current power P of the motor[n]；
Obtaining a set power value P, and obtaining the current power P according to the set power P and the current power P[n]The difference value of (A) is used to obtain the command current I[n]；
According to a set advance angle phi and the command current I[n]Obtaining a q-axis command current value and a d-axis command current value (Iq) of the motor[n]，Id*[n]）；
According to the command current value (Iq;)[n],Id*[n]) And the detected current value (Iq)[n]，Id[n]) Obtaining a command voltage value (Vq;)[n],Vd*[n]）；
Will obtain the command voltage value (Vq;)[n],Vd*[n]) Conversion into three-phase command voltage values (Vu)[n]，Vv[n]，Vw[n]）；
According to three-phase command voltage value (Vu)[n]，Vv[n]，Vw[n]) And the direct current bus voltage Vdc is used for calculating a three-phase duty ratio signal and transmitting the three-phase duty ratio signal to the motor.
2. The motor control method of the constant power vacuum cleaner according to claim 1,
obtaining q-axis and d-axis current values (Iq) of the motor in the current control period[n]，Id[n]) The method comprises the following steps:
detecting a three-phase current value (iu) of the motor[n]，iv[n]，iw[n]）；
The obtained three-phase current value (iu) of the motor[n]，iv[n]，iw[n]) Converted into a two-phase current value (Iq)[n]，Id[n]）。
3. The motor control method of a constant power cleaner according to claim 1,
P[n]= (Vq*[n-1]× Iq[n]) + (Vd*[n-1]× Id[n]）。
4. the motor control method of a constant power cleaner according to claim 1,
Iq*[n]= I*[n]× cosφ；
Id*[n]= I*[n]×（-sinφ）。
5. the motor control method of a constant power cleaner according to claim 1,
u-phase duty cycle = Vu ÷ Vdc;
v-phase duty cycle = Vv ÷ Vdc;
w-phase duty cycle = Vw ÷ Vdc.
6. A constant power vacuum cleaner comprising a controller and a set of three phase commutation circuits, the controller controlling the motor of the constant power vacuum cleaner according to the control method of any one of claims 1 to 5.
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2020
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| US5032771A (en) * | 1990-08-09 | 1991-07-16 | Allen-Bradley Company, Inc. | Slip control based on sensing voltage fed to an induction motor |
| CN103204069A (en) * | 2013-05-07 | 2013-07-17 | 湖南大学 | Electromobile range extender and control method |
| CN105843321A (en) * | 2016-04-08 | 2016-08-10 | 中国矿业大学 | Maximum power tracking control method for switched reluctance wind turbine system |
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