CN104779851A - Method for detecting counter electromotive force of motor - Google Patents
Method for detecting counter electromotive force of motor Download PDFInfo
- Publication number
- CN104779851A CN104779851A CN201510124754.2A CN201510124754A CN104779851A CN 104779851 A CN104779851 A CN 104779851A CN 201510124754 A CN201510124754 A CN 201510124754A CN 104779851 A CN104779851 A CN 104779851A
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- gnd
- offset
- motor
- gnd1
- electromotive force
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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
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/20—Arrangements for starting
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention relates to a counter electromotive force detection method of an air-conditioner permanent magnetic synchronous direct-current motor outer fan, provides a method for detecting counter electromotive force of a motor, and aims to solve the problems that in the prior art a method for effectively detecting the counter electromotive force of the air-conditioner permanent magnetic synchronous direct-current motor outer fan is not available. The method comprises the following steps: detecting direct-current offset voltage AD conversion values between three-phase counter electromotive force of the motor and the ground, wherein the direct-current offset voltage AD conversion values are respectively expressed as Vu_offset, Vv-offset and Vw-offset; detecting AD conversion values of voltages between the three-phase counter electromotive force of the motor and the ground, wherein the AD conversion values are expressed as Vu-GND1, Vv_GND1 and Vw_GND1; calculating phase voltage counter electromotive force values Uu_GND, Uv_GND and Uw_GND between the counter electromotive force and the central point of a motor coil according to Vu_offset, Vv-offset, Vw-offset, Vu-GND1, Vv_GND1 and Vw_GND1; calculating the voltage UN_GND between the central point of the motor coil and the ground according to Uu_GND, Uv_GND and Uw_GND; calculating phase voltage Vu, Vu and Vw of the counter electromotive force of motor according to UN_GND, Uu_GND, Uv_GND and Uw_GND. The method is applicable to air-conditioner permanent magnetic synchronous motors.
Description
Technical field
The present invention relates to air conditioner controlling technology, particularly the back electromotive force detection method of air-conditioning permanent magnet synchronous DC motor outer ventilation machine.
Background technology
Permanent-magnet synchronous DC brushless motor, its back electromotive force is sine wave shape, when adopting permanent-magnet synchronous DC brushless motor as outdoor fan of air-conditioner driver part, due to reasons such as sea winds, air-conditioning before activation, outdoor fan motor may be in positive direction or counter-rotation, controller needs to detect the position of motor, rotating speed and its rotation direction, but all to detect back electromotive force, detected by back electromotive force and reach testing goal, in good time controls accordingly according to the working order of motor, reaches correct and controls the objects such as the operation of motor.
What number of patent application was " 201410183282.3 " application discloses control method, control device that a kind of outdoor fan of air-conditioner drives and have its air-conditioning, the importance detect back electromotive force and back electromotive force detection method are illustrated.But do not provide concrete detection algorithm in this patent application, and, the 8th page, its specification: work as E
aB=Usin θ, E
bCtime=Usin (θ-120 °), obtain formula
be wrong, correct formula is
moreover formula does not also illustrate E
aB/ E
bCdetection method.
Summary of the invention
The present invention is directed in prior art the problem of the method for the back electromotive force not having a kind of effective detection air-conditioning permanent magnet synchronous DC motor outer ventilation machine, provide a kind of counter electromotive force of motor detection method, the method comprises the steps:
Detect motor three phase back-emf over the ground between DC offset voltage AD conversion value, be expressed as V
u_ offset, V
v_ offset and V
w_ offset, detect motor three phase back-emf over the ground between voltage AD conversion value, be expressed as V
u_GND1, V
v_GND1and V
w_GND1;
According to V
u_ offset, V
v_ offset, V
w_ offset, V
u_GND1, V
v_GND1and V
w_GND1calculate three phase back-emf to the phase voltage back-emf value U between motor coil central point
u_GND, U
v_GNDand U
w_GND;
According to U
u_GND, U
v_GNDand U
w_GNDcalculate motor coil central point over the ground between voltage U
n_GND, and according to U
n_GND, U
u_GND, U
v_GNDand U
w_GNDcalculate the phase voltage V of motor three phase back-emf
u, V
uand V
w.
Particularly, detect motor three phase back-emf over the ground between the concrete grammar of DC offset voltage AD conversion value comprise the following two kinds method: one, under the motionless condition of motor, direct-detection DC offset voltage V
u_ offset, V
v_ offset and V
w_ offset; Two, direct-detection motor three phase back-emf over the ground between voltage, wherein every phase back-emf is that the voltage of straight line portion is DC offset voltage V
u_ offset, V
v_ offset and V
w_ offset.
Particularly, U
u_GND, U
v_GNDand U
w_GNDrespectively by formula U
u_GND=V
u_GND1-V
u_ offset, U
v_GND=V
v_GND1-V
v_ offset and U
w_GND=V
w_GND1-V
w_ offset calculates.
Particularly, motor coil central point over the ground between voltage U
n_GNDpass through formula
Calculate.
Particularly, V
u, V
uand V
wrespectively by formula V
u=U
u_GND-U
n_GND, V
v=U
v_GND-U
n_GNDand V
w=U
w_GND-U
n_GNDcalculate.
Can according to V
u, V
uand V
wresult of calculation obtain motor current location angle θ and rotational speed omega.
The invention has the beneficial effects as follows, by above-mentioned back electromotive force detection method, detection motor three phase back-emf that can be correct, calculate the motor rotor position information θ comprised in counter electromotive force of motor accordingly, rotor turns frequency f and rotor angle be the information such as ω, f=2 π ω and rotor rotating several times, solve before starting because factor such as the sea wind etc. from outside causes outdoor fan of air-conditioner own rotation, the startup control problem to motor caused.Meanwhile, also make counter electromotive force of motor detect and become simple.
Embodiment
Below in conjunction with embodiment, technical scheme of the present invention is further described, it should be noted that embodiment is only used to help reader to understand technical scheme of the present invention better, not in order to limit the protection range of the claims in the present invention.
The invention provides a kind of counter electromotive force of motor detection method, by electric resistance partial pressure, single-chip microprocessor MCU detect motor three phase back-emf U, V/W over the ground between AD conversion value V
u_GND1/ V
v_GND1/ V
w_GND1, and the phase voltage V of motor three phase back-emf U/V/W is obtained by publicity conversion
u, V
u, V
w.On this basis, can by V
u, V
u, V
wobtain motor current location angle θ and rotational speed omega, start for the contrary wind controlling motor.The concrete steps changing method are as follows: first, detect motor three phase back-emf over the ground between DC offset voltage AD conversion value, be expressed as V
u_ offset, V
v_ offset and V
w_ offset, detect motor three phase back-emf over the ground between the AD conversion value of voltage, be expressed as V
u_GND1, V
v_GND1and V
w_GND1; According to V
u_ offset, V
v_ offset, V
w_ offset, V
u_GND1, V
v_GND1and V
w_GND1calculate three phase back-emf to the phase voltage back-emf value U between motor coil central point
u_GND, U
v_GNDand U
w_GND; Then, according to U
u_GND, U
v_GNDand U
w_GNDcalculate motor coil central point over the ground between voltage U
n_GND, and according to U
n_GND, U
u_GND, U
v_GNDand U
w_GNDcalculate the phase voltage V of motor three phase back-emf
u, V
uand V
w.
Embodiment
MCU first detect motor three phase back-emf U/V/W over the ground between DC offset voltage V
u_ offset, V
v_ offset, V
w_ offset, and according to U
u_GND=V
u_GND1-V
u_ offset, U
v_GND=V
v_GND1-V
v_ offset and U
w_GND=V
w_GND1-V
w_ offset calculates three phase back-emf to the phase voltage back-emf value U between motor coil central point
u_GND, U
v_GNDand U
w_GND.
U
u_GND＝U
u_N+U
N_GND(1)
U
v_GND＝U
v_N+U
N_GND(2)
U
w_GND＝U
w_N+U
N_GND(3)
Wherein U
n_GNDbe motor coil central point N over the ground between voltage, U
u_N, U
v_N, U
w_Nbe respectively U/V/W to the phase voltage back-emf value between motor coil central point N, be separately designated as V
u, V
v, V
w.
(1), (2) and (3) are added:
U
u_GND+U
v_GND+U
w_GND＝(U
u_N+U
v_N+U
w_N)+3U
N_GND
Due to U
u_N+ U
v_N+ U
w_N=V
u+ V
v+ V
w=0;
So
In like manner, obtained by (1), (2) and (3):
U
u_GND＝V
u+U
N_GND，U
v_GND＝V
v+U
N_GND，U
w_GND＝V
w+U
N_GND，
So V
u=U
u_GND-U
n_GND, V
v=U
v_GND-U
n_GND, V
w=U
w_GND-U
n_GND.
Calculating V
u, V
uand V
wvalue after, motor current location angle θ and rotational speed omega can be obtained further, in order to control the startup of motor.
Claims (6)
1. counter electromotive force of motor detection method, is characterized in that, comprises the steps:
Detect motor three phase back-emf over the ground between the AD conversion value of DC offset voltage, be expressed as V
u_ offset, V
v_ offset and V
w_ offset, detect motor three phase back-emf over the ground between the AD conversion value of voltage, be expressed as V
u_GND1, V
v_GND1and V
w_GND1;
According to V
u_ offset, V
v_ offset, V
w_ offset, V
u_GND1, V
v_GND1and V
w_GND1calculate three phase back-emf to the phase voltage back-emf value U between motor coil central point
u_GND, U
v_GNDand U
w_GND;
According to U
u_GND, U
v_GNDand U
w_GNDcalculate motor coil central point over the ground between voltage U
n_GND, and according to U
n_GND, U
u_GND, U
v_GNDand U
w_GNDcalculate the phase voltage V of motor three phase back-emf
u, V
uand V
w.
2. counter electromotive force of motor detection method as claimed in claim 1, is characterized in that, detect motor three phase back-emf over the ground between the concrete grammar of DC offset voltage AD conversion value as follows: under the condition that motor is motionless, direct-detection DC offset voltage V
u_ offset, V
v_ offset and V
w_ offset.
3. counter electromotive force of motor detection method as claimed in claim 1, it is characterized in that, detect motor three phase back-emf over the ground between the concrete grammar of DC offset voltage AD conversion value as follows: direct-detection motor three phase back-emf over the ground between voltage, wherein every phase back-emf is that the voltage of straight line portion is DC offset voltage V
u_ offset, V
v_ offset and V
w_ offset.
4. counter electromotive force of motor detection method as claimed in claim 1 or 2, is characterized in that, U
u_GND, U
v_GNDand U
w_GNDrespectively by formula U
u_GND=V
u_GND1-V
u_ offset, U
v_GND=V
v_GND1-V
v_ offset and U
w_GND=V
w_GND1-V
w_ offset calculates.
5. counter electromotive force of motor detection method as claimed in claim 4, is characterized in that, motor coil central point over the ground between voltage U
n_GNDpass through formula
Calculate.
6. counter electromotive force of motor detection method as claimed in claim 5, is characterized in that, V
u, V
uand V
wrespectively by formula V
u=U
u_GND-U
n_GND, V
v=U
v_GND-U
n_GNDand V
w=U
w_GND-U
n_GNDcalculate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510124754.2A CN104779851B (en) | 2015-03-20 | 2015-03-20 | Counter electromotive force of motor detection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510124754.2A CN104779851B (en) | 2015-03-20 | 2015-03-20 | Counter electromotive force of motor detection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104779851A true CN104779851A (en) | 2015-07-15 |
| CN104779851B CN104779851B (en) | 2018-04-10 |
Family
ID=53621137
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510124754.2A Active CN104779851B (en) | 2015-03-20 | 2015-03-20 | Counter electromotive force of motor detection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104779851B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108900122A (en) * | 2018-07-26 | 2018-11-27 | 大力电工襄阳股份有限公司 | Variable frequency soft start control unit and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242154A (en) * | 2008-03-14 | 2008-08-13 | 重庆大学 | A built-in permanent magnetic brushless DC motor control system for no position sensor |
| CN103187911A (en) * | 2013-02-04 | 2013-07-03 | 安徽中家智锐科技有限公司 | Brushless direct current motor counter electromotive force phase point detecting method |
| EP2662976A1 (en) * | 2011-02-15 | 2013-11-13 | Sanden Corporation | Motor control device |
| US20140062362A1 (en) * | 2012-09-06 | 2014-03-06 | Fanuc Corporation | Control device of permanent magnet synchronous motor for preventing irreversible demagnetization of permanent magnet and control system including the same |
-
2015
- 2015-03-20 CN CN201510124754.2A patent/CN104779851B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101242154A (en) * | 2008-03-14 | 2008-08-13 | 重庆大学 | A built-in permanent magnetic brushless DC motor control system for no position sensor |
| EP2662976A1 (en) * | 2011-02-15 | 2013-11-13 | Sanden Corporation | Motor control device |
| US20140062362A1 (en) * | 2012-09-06 | 2014-03-06 | Fanuc Corporation | Control device of permanent magnet synchronous motor for preventing irreversible demagnetization of permanent magnet and control system including the same |
| CN103187911A (en) * | 2013-02-04 | 2013-07-03 | 安徽中家智锐科技有限公司 | Brushless direct current motor counter electromotive force phase point detecting method |
Non-Patent Citations (1)
| Title |
|---|
| 薛林锋 等: "基于DSP的无位置传感器无刷直流电机控制技术", 《长沙电力学院学报（自然科学版）》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108900122A (en) * | 2018-07-26 | 2018-11-27 | 大力电工襄阳股份有限公司 | Variable frequency soft start control unit and method |
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| Publication number | Publication date |
|---|---|
| CN104779851B (en) | 2018-04-10 |
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