CN101833041B - Method for detecting resistance of DC permanent magnet brush motor - Google Patents
Method for detecting resistance of DC permanent magnet brush motor Download PDFInfo
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- CN101833041B CN101833041B CN2010101112260A CN201010111226A CN101833041B CN 101833041 B CN101833041 B CN 101833041B CN 2010101112260 A CN2010101112260 A CN 2010101112260A CN 201010111226 A CN201010111226 A CN 201010111226A CN 101833041 B CN101833041 B CN 101833041B
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Abstract
The invention discloses a method for detecting the resistance of a DC permanent magnet brush motor, which comprises the following steps of: changing the angular frequency of the alternating current in an AC and DC synthesizer power supply which supplies power to the motor for at least three times, regulating and recording the AC effective value of the motor for each time, and measuring AC active power of the motor for at least three times; and calculating the resistance of the motor according to the at least three groups of angular frequencies, the recorded AC effective value of the motor and the at least three groups of AC active power of the motor. The resistance of the motor is detected by the method that the AC and DC synthesizer power supply supplies power to the motor; because the AC active power of the motor is completely consumed on a resistor and an iron core of the motor, the AC effective value and the AC active power of the motor under the corresponding angular frequency of the motor are detected and recorded by changing the angular frequency of the alternating current; and the resistance of the motor at a corresponding stable rotation speed can be calculated according to the measured data and an associated formula.
Description
Technical field
The present invention relates to the resistive measurement field, more particularly, relate to a kind of method that detects resistance of DC permanent magnet brush motor.
Background technology
Resistance of DC permanent magnet brush motor comprises the contact resistance between lead resistance, carbon brush resistance and carbon brush and the commutator segment between armature coil wire resistor, connection terminal to carbon brush.The resistance (hereinafter to be referred as resistance) of DC permanent magnet brush motor (hereinafter to be referred as motor) has material impact to the operation characteristic of motor, accurately test resistance the most directly meaning be: be the correct electromechanical properties that the obtains motor data that provide the foundation.
The method that detects motor resistance at present has two kinds basically: a kind of is to utilize the voltage and current and then the conversion that detect motor starting moment (stall) state to obtain resistance.Yet, because the resistance between commutator segment because of the armature manufacturing process is different, makes the carbon brush of motor be parked in the resistance difference that different positions records; In addition, because the existence of armature inductance makes the resistance existence of the resistance that leans on starting transient voltage and electric current to convert to obtain and reality than large deviation, more can not record the resistance of motor under different running statuses.Another kind method is to utilize the dynamic parameter that detects motor starting procedure to debate the model of knowing motor; And then conversion records resistance; Resistance under resistance that obtains thus and the motor quiet rum still there are differences; Therefore, still can not adopt the method to detect the resistance of motor under quiet rum.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of method that detects resistance of DC permanent magnet brush motor, this method can detect the resistance of motor under quiet rum, thereby can obtain the electromechanical properties parameter of motor according to the resistance value that records.
For realizing above-mentioned purpose; A kind of method that detects resistance of DC permanent magnet brush motor provided by the invention; Said method specifically comprises the steps: to change at least three times to pulsation ω in the synthetic power supply of the alternating current-direct current of motor power supply; Each effective value B and record of all regulating the motor alternating current records No. three motor at least and exchanges active power P
AcEffective value B according to the motor alternating current of said at least three group angular frequency, said record exchanges active power P with at least three group motor
AcCalculate the resistance R of motor.
Preferably, the effective value B of said motor alternating current according to said at least three group angular frequency, said record exchanges active power P with at least three group motor
AcThe resistance R that calculates motor is specially: the effective value B of the motor alternating current of said at least three group angular frequency, said record is exchanged active power P with at least three group motor
AcSubstitution formula P
Ac=B
2R+ α B
2ω+β B
2ω
2In, obtain having at least three equations of three unknown numbers; Separate the system of equations of forming by said at least three equations, draw the resistance R of motor.
Preferably, all regulate the effective value B that alternating voltage makes the alternating current of motor is certain value at every turn.
Preferably, be used for comprising: all adjustable alternating voltage component of adjustable DC voltage component of amplitude and amplitude and frequency to the synthetic power supply of the alternating current-direct current of motor power supply; Wherein, said DC voltage component is used to regulate the rotating speed of motor, and said alternating voltage component is used to detect the resistance of motor under corresponding rotating speed.
Preferably, the waveform of alternating voltage component is the periodic waveform of arbitrary shapes such as sine wave, square wave, triangular wave or sawtooth wave in the synthetic power supply of said alternating current-direct current.
Preferably, be used for to the synthetic power supply of the alternating current-direct current of motor power supply by direct supply and AC power combination and form place in circuit to connect.
Preferably, be used for making up with AC power by direct supply and with parallelly connected form place in circuit to the synthetic power supply of the alternating current-direct current of motor power supply.One of branch road series connection at direct supply prevents AC power by the inductance of direct supply short circuit, and connecting one at the branch road of AC power prevents that direct supply is by the electric capacity of AC power short circuit.
This shows; The present invention adopts the synthetic power supply of alternating current-direct current to detect the resistance of motor to the method for motor power supply; Synthesize pulsation in the power supply through changing three alternating current-direct currents at least; Each effective value and record of all regulating the motor alternating current; At least record the interchange active power of No. three motor, exchange active power with at least three group motor by the motor alternating current effective value of said at least three group pulsations, said record and can calculate the resistance under the corresponding steady-state speed of motor.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention, the accompanying drawing of required use among the embodiment is introduced.Obviously, the accompanying drawing in describing below only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
A kind of method flow diagram that detects resistance of DC permanent magnet brush motor that Fig. 1 provides for the embodiment of the invention;
A kind of electrical block diagram that detects resistance of DC permanent magnet brush motor that Fig. 2 provides for the embodiment of the invention;
Fig. 3 provide for the embodiment of the invention another detect the electrical block diagram of resistance of DC permanent magnet brush motor;
The another kind that Fig. 4 provides for the embodiment of the invention detects the electrical block diagram of resistance of DC permanent magnet brush motor;
Fig. 5 provide for the embodiment of the invention another detect the method flow diagram of resistance of DC permanent magnet brush motor.
Embodiment
To combine the accompanying drawing in the embodiment of the invention below, the technical scheme in the embodiment of the invention is carried out clear, intactly description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills are not making under the creative work prerequisite, and the every other embodiment that is obtained belongs to protection domain of the present invention.
All the parameter of test motor stall or starting process under the effect of direct supply and then the resistance that records motor in the prior art; Resistance under said resistance that records and the motor quiet rum there are differences, and then influences the electromechanical properties of accurate test motor.
In order to solve the problems of the technologies described above; The invention provides a kind of method that detects resistance of DC permanent magnet brush motor; Method provided by the invention adopts the synthetic power supply of alternating current-direct current to supply power to motor; Wherein, the DC voltage component amplitude scalable in the synthetic power supply of alternating current-direct current is through regulating the steady-state speed that DC voltage component can change motor; The frequency and the equal scalable of amplitude of the alternating voltage component in the synthetic power supply of alternating current-direct current; Through regulating the frequency and the amplitude of alternating voltage component; Can detect the resistance of motor under corresponding steady-state speed, the waveform of alternating voltage component can be periodic waveforms such as sine wave, square wave, triangular wave or sawtooth wave in the synthetic power supply of said alternating current-direct current.
With reference to figure 1, be a kind of method embodiment 1 that detects resistance of DC permanent magnet brush motor that the embodiment of the invention provides, present embodiment specifically can comprise the steps:
Step 101: the synthetic power supply of alternating current-direct current is exported to motor.
DC permanent magnet brush motor connects behind the synthetic power supply of alternating current-direct current under the effect of DC voltage component by certain rotating speed and turns to running; When the frequency of alternating voltage in the synthetic power supply of alternating current-direct current during far above the natural frequency of motor rotor; The operating condition of said motor is constant, and the interchange active power of motor all consumes on the resistance and iron core of motor.
The alternating voltage at motor two ends does
Wherein, A is the alternating voltage effective value, and ω is the AC power angular frequency, and t is the time.
Alternating current through motor does
Wherein, B is the alternating current effective value; ω is the AC power angular frequency; T is the time, and
is phase place.
Then the interchange active power of motor does
Step 102: change the angular frequency of alternating voltage in the synthetic power supply of three alternating current-direct currents, the alternating current effective value of at every turn all regulating motor is definite value B, records the interchange active power of three groups of motor.
The angular frequency of alternating voltage is a numerical value in the synthetic power supply of adjustment alternating current-direct current, and regulating in the synthetic power supply of alternating current-direct current the amplitude of alternating voltage, to make the alternating current effective value of motor be definite value B, the interchange active power of the motor that record records this moment.Change the angular frequency of alternating voltage in the synthetic power supply of three alternating current-direct currents, and with the angular frequency of being adjusted for said three times
1, ω
2, ω
3Note, all regulate the amplitude of alternating voltage in the synthetic power supply of alternating current-direct current each time, the alternating current effective value that makes motor is definite value B, the interchange active power P of the motor that each correspondence is recorded
Ac1, P
Ac2, P
Ac3Note.
Step 103: according to the alternating current effective value B of said motor, three groups of angular frequency
1, ω
2, ω
3With three groups of motor exchange active power P
Ac1, P
Ac2, P
Ac3Calculate the resistance R of motor.
Because the interchange active power of motor all consumes on the resistance and iron core of motor, and the iron loss on the motor iron-core comprises magnetic hysteresis loss P
mWith eddy current loss P
w, when alternating current effective value B hour, the flux change scope is less in the armature core, can regard approximately linear as and change, then magnetic hysteresis loss P
mWith eddy current loss P
wBe respectively
P
m＝αB
2ω (4)
Wherein, B is the alternating current effective value, and ω is the AC power angular frequency, and α is a hysteresis loss coefficient.Because the DC current of motor is constant; The quiescent point that is iron core is constant; Make the effective value B of alternating current constant because of regulating alternating voltage again; Therefore then iron-core magnetic induction intensity-magnetic field intensity curve is constant at track and the area of an alternating current in the cycle, at an alternating current total magnetic hysteresis loss P in the cycle
mConstant, promptly for given motoring (DC current one regularly) and given AC value B, α does not receive the influence of AC power angular frequency yet.
P
w＝βB
2ω
2 (5)
Wherein, B is the alternating current effective value, and ω is the AC power angular frequency, and β is an eddy current loss factor.Because the DC current of motor is constant; The quiescent point that is iron core is constant; Make the effective value B of alternating current constant because of regulating alternating voltage again; Therefore then iron-core magnetic induction intensity-magnetic field intensity curve is constant at track and the area of an alternating current in the cycle, at an alternating current total eddy current loss P in the cycle
wConstant, promptly for given motoring (DC current one regularly) and given AC value B, β does not receive the influence of AC power angular frequency yet.
And the ohmic loss P of motor
rFor
P
r＝B
2R (6)
Wherein, B is a motor alternating current effective value, and R is the resistance of motor.
Then the interchange active power of motor does
P
ac＝P
r+P
m+P
w (7)
Promptly
P
ac＝B
2R+αB
2ω+βB
2ω
2 (8)
With the pulsation ω that has changed three times described in the step 102
1, ω
2And ω
3, the motor alternating current effective value B after the adjusting, the interchange active power P of said three groups of motor that record
Ac1, P
Ac2And P
Ac3In the substitution formula (8), then have
P
ac1＝B
2R+αB
2ω
1+βB
2ω
1 2 (9)
P
ac2＝B
2R+αB
2ω
2+βB
2ω
2 2 (10)
P
ac3＝B
2R+αB
2ω
3+βB
2ω
3 2 (11)
The system of equations that simultaneous formula (9), (10) and (11) are formed, total α, β and three unknown numbers of R in the system of equations, that separates can try to achieve the resistance R of motor under steady-state speed.
Certainly, also can be through repeatedly changing pulsation ω, the voltage of all regulating alternating current each time makes that motor alternating current effective value is B, records corresponding motor and exchanges active power P
Ac, gained data substitution formula (8) is found the solution.This present invention is not had special restriction, but, can solve resistance R so should test three groups of data at least because the unknown number in the formula (8) except the resistance R of motor, also has and iron core magnetic hysteresis loss and related constant alpha of eddy current loss and β.
Can find out from top embodiment; Because the present invention utilizes the synthetic power supply of alternating current-direct current to drive motor operation; The DC voltage of the synthetic power supply of alternating current-direct current is used for regulating the rotating speed of motor; The active power that the alternating current of the synthetic power supply of alternating current-direct current is exported to motor all consumes on the resistance and iron core of motor; Through changing pulsation at least three times; The voltage of regulating alternating current all remains unchanged the alternating current effective value of motor at every turn, detects the corresponding interchange active power of supplying with motor, exchanging active power and can calculate the resistance of motor under steady-state speed by the alternating current effective value and at least three group pulsations of motor, at least three group motor.
In practical application, change three pulsations and be respectively ω
1, ω
2And ω
3The time No. three motor regulating the alternating current effective value can have certain deviation, three institutes are regulated the motor alternating current effective values of surveying are designated as B respectively
1, B
2, B
3, then have
P
ac1＝B
1 2(R+αω
1+βω
1 2) (12)
P
ac2＝B
2 2(R+αω
2+βω
2 2) (13)
P
ac3＝B
3 2(R+αω
3+βω
3 2) (14)
The system of equations that simultaneous formula (12), (13) and (14) are formed, total α, β and three unknown numbers of R in the system of equations, that separates can try to achieve the resistance R of motor under steady-state speed.
With reference to figure 2, be a kind of electrical block diagram that detects resistance of DC permanent magnet brush motor provided by the invention.The synthetic power supply E of alternating current-direct current has been shown among the figure, DC permanent magnet brush motor M, alternating current-direct current synthetic power supply E give DC permanent magnet brush motor M power supply.The input current I of said DC permanent magnet brush motor M
MComprise DC current I
DcWith alternating current I
Ac, the terminal voltage U of said DC permanent magnet brush motor M
MComprise DC voltage U
DcWith alternating voltage U
Ac
With reference to figure 3 and Fig. 4, two kinds of concrete electrical block diagrams that detect resistance of DC permanent magnet brush motor that provide for the embodiment of the invention.
Direct supply E has been shown among Fig. 3
Dc, AC power E
Ac, said direct supply E
DcWith said AC power E
AcBe series relationship.Said direct supply E
DcWith said AC power E
AcDC permanent magnet brush motor M is exported in acting in conjunction, the input current I of said DC permanent magnet brush motor M
MComprise DC current I
DcWith alternating current I
Ac, the terminal voltage U of said DC permanent magnet brush motor M
MComprise DC voltage U
DcWith alternating voltage U
Ac
Direct supply E has been shown among Fig. 4
Dc, AC power E
Ac, said direct supply E
DcWith said AC power E
AcBe the parallel connection relation.At said direct supply E
DcBranch road be in series with inductance L, said inductance L is used for preventing AC power E
AcBy direct supply E
DcShort circuit; At said AC power E
AcBranch road be in series with capacitor C, said capacitor C is used for preventing direct supply E
DcBy AC power E
AcShort circuit.Said direct supply E
DcWith said AC power E
AcDC permanent magnet brush motor M is exported in acting in conjunction, the input current I of said DC permanent magnet brush motor M
MComprise DC current I
DcWith alternating current I
Ac, the terminal voltage U of said DC permanent magnet brush motor M
MComprise DC voltage U
DcWith alternating voltage U
Ac
Certainly; AC power in the synthetic power supply of alternating current-direct current described in the present invention and direct supply are except being connected in the circuit with the connected mode shown in Fig. 3 and Fig. 4; Can also be connected to circuit with the form of series-parallel connection; Do not do too much giving unnecessary details at this, as long as the scope that modification that those skilled in the art are made and polishing all belong to the present invention to be protected under the prerequisite of not paying creative work.
No matter for which kind of connected mode, concrete detect motor resistance in, its manner of execution step all is identical.With reference to figure 5, be a kind of method embodiment 2 that detects resistance of DC permanent magnet brush motor that the embodiment of the invention provides, present embodiment specifically can comprise the steps:
Step 201: synthetic power supply E supplies with motor M with an alternating current-direct current.
Wherein, pulsation and the amplitude among the synthetic power supply E of said alternating current-direct current is all variable.What the connected mode of AC power and direct supply can be for shown in Fig. 3 and Fig. 4 in the synthetic power supply of said alternating current-direct current is a kind of, also can be to be different from above-mentioned two kinds connected mode.
Step 202: given pulsation is a value ω
1, regulate alternating current voltage and make the alternating current I of motor
AcEffective value be B, detect the alternating voltage U of terminal voltage of motor
Ac, record the interchange active power P of motor
Ac1And record.
Step 203: change pulsation and be another value ω
2, regulate alternating current voltage and make the alternating current I of motor
AcEffective value be B, detect the alternating voltage U of terminal voltage of motor
Ac, record the interchange active power P of motor
Ac2And record.
Step 204: change pulsation once more and be another value ω
3, regulate alternating current voltage and make the alternating current I of motor
AcEffective value be B, detect the alternating voltage U of terminal voltage of motor
Ac, record motor interchange active power P
Ac3And record.
Step 205: with calculating resistance R in the data substitution formula (8) in the step 202,203 and 204.
With the angular frequency that has changed three times in the step 202,203 and 204
1, ω
2And ω
3, the effective value B of the alternating current of the motor after the adjusting, the interchange active power P of three groups of motor that record
Ac1, P
Ac2And P
Ac3In the substitution formula (8), obtain formula (9), (10) and (11) three equations respectively, contain R, α and three unknown numbers of β in said three equations, said three equations of simultaneous are also found the solution, and calculate the resistance R of motor.
Certainly, all can change pulsation ω several times among embodiment 1 and the embodiment 2, it is B that each voltage of all regulating alternating current makes motor alternating current effective value, and then surveys the interchange active power P of several groups of motor more more
Ac, the resistance R of the motor that calculates like this is more accurate.For other performance parameters of motor, as long as can obtain through this detection method with resistance R is relevant.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments among this paper.Therefore, the present invention will can not be restricted to these embodiment shown in this paper, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (9)
1. a method that detects resistance of DC permanent magnet brush motor is characterized in that, comprising:
At least change three times to pulsation ω in the synthetic power supply of the alternating current-direct current of motor power supply, all regulate the effective value B and the record of motor alternating current at every turn, record No. three motor at least and exchange active power P
Ac
Effective value B according to the motor alternating current of said at least three group angular frequency, said record exchanges active power P with at least three group motor
AcCalculate the resistance R of motor.
2. method according to claim 1 is characterized in that, the effective value B of said motor alternating current according to said at least three group angular frequency, said record exchanges active power P with at least three group motor
AcCalculate the resistance R of motor, be specially:
The effective value B of the motor alternating current of said at least three group angular frequency, said record is exchanged active power P with at least three group motor
AcSubstitution formula P
Ac=B
2R+ α B
2ω+β B
2ω
2In, obtain having at least three equations of three unknown numbers, wherein, α is a hysteresis loss coefficient, β is an eddy current loss factor;
Separate the system of equations of forming by said at least three equations, draw the resistance R of motor.
3. method according to claim 1 and 2 is characterized in that, all regulate the effective value B that alternating voltage makes the alternating current of motor is certain value at every turn.
4. method according to claim 1 and 2 is characterized in that, is used for comprising to the synthetic power supply of the alternating current-direct current of motor power supply: all adjustable alternating voltage component of adjustable DC voltage component of amplitude and amplitude and frequency; Wherein, said DC voltage component is used to regulate the rotating speed of motor, and said alternating voltage component is used to detect the resistance of motor under corresponding rotating speed.
5. method according to claim 4 is characterized in that, the waveform of alternating voltage component is sine wave, square wave, triangular wave or sawtooth period property waveform in the synthetic power supply of said alternating current-direct current.
6. method according to claim 1 and 2 is characterized in that, is used for to the synthetic power supply of the alternating current-direct current of motor power supply by direct supply and AC power combination and the form place in circuit to connect.
7. method according to claim 1 and 2 is characterized in that, is used for being made up with AC power by direct supply and with parallelly connected form place in circuit to the synthetic power supply of the alternating current-direct current of motor power supply.
8. method according to claim 7 is characterized in that, connecting one at the branch road of direct supply prevents that AC power is by the inductance of direct supply short circuit.
9. method according to claim 7 is characterized in that, connecting one at the branch road of AC power prevents that direct supply is by the electric capacity of AC power short circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101112260A CN101833041B (en) | 2010-02-10 | 2010-02-10 | Method for detecting resistance of DC permanent magnet brush motor |
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|---|---|---|---|
| CN2010101112260A CN101833041B (en) | 2010-02-10 | 2010-02-10 | Method for detecting resistance of DC permanent magnet brush motor |
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| CN101833041B true CN101833041B (en) | 2012-09-05 |
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| JP5947144B2 (en) * | 2012-08-08 | 2016-07-06 | 東海旅客鉄道株式会社 | Damage detection device for armature shaft support structure |
| CN110808160B (en) * | 2019-11-19 | 2022-09-20 | 青岛航天半导体研究所有限公司 | Winding method for copper strip winding of transformer |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1247988A (en) * | 1998-09-17 | 2000-03-22 | 丹福斯有限公司 | Method for automatic measuring asynchronous machine rotor ohmic resistance |
| CN1420360A (en) * | 2001-11-20 | 2003-05-28 | 卢骥 | Method for observing stator side resistance of asynchronous motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3388440B2 (en) * | 2000-02-29 | 2003-03-24 | マルチ計測器株式会社 | How to measure ground resistance |
| MX2009013287A (en) * | 2007-06-04 | 2010-02-24 | Eaton Corp | System and method for determining stator winding resistance in an ac motor. |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1247988A (en) * | 1998-09-17 | 2000-03-22 | 丹福斯有限公司 | Method for automatic measuring asynchronous machine rotor ohmic resistance |
| CN1420360A (en) * | 2001-11-20 | 2003-05-28 | 卢骥 | Method for observing stator side resistance of asynchronous motor |
Non-Patent Citations (1)
| Title |
|---|
| JP特开2001-242206A 2001.09.07 |
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