CN101603997A - Testing parameters of synchronous motor and realize the device of this method - Google Patents
Testing parameters of synchronous motor and realize the device of this method Download PDFInfo
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Abstract
Testing parameters of synchronous motor and realize the device of this method relates to the electromechanical testing field.It has solved the friendship that exists in the existing method, low, the moment coefficient method of testing complexity of measuring accuracy of d-axis inductance parameters, and the problem strong to the dependence of drive performance.Method of the present invention is; Give and feed single-phase alternating current Isin ω t in any two-phase in three phase windings of tested synchronous motor, the rotor that adopts external force to drag tested synchronous motor at the uniform velocity rotates a circle above, measure the voltage signal that obtains energising winding two ends, the friendship axle and the d-axis inductance that obtain tested synchronous motor according to described voltage signal are respectively L
q, L
dGive and feed DC current I in any two-phase in three phase windings of tested synchronous motor
1, the rotor that adopts external force to drag tested synchronous motor at the uniform velocity rotates a circle above, according to the maximum torque value T that measures
Max1Calculate the moment coefficient K that obtains tested synchronous motor
TThe present invention is applicable to the field tests to parameter of synchronous machine.
Description
Technical field
The present invention relates to the Motor Measuring Technology field, be specifically related to the measuring technology of parameter of synchronous machine.
Background technology
The order of accuarcy of parameter of synchronous machine has crucial influence for the computational accuracy of motor characteristic and performance, the accuracy of mathematical model, the control performance of kinetic control system.In parameter of synchronous machine, winding resistance can utilize methods such as LCR table, bridge method to record simply usually; Back emf coefficient can be utilized other motor to drag by measured motor to rotate, survey the unloaded electromotive force and the motor speed at its winding two ends, obtain by calculating then; The measuring process of moment coefficient is normally: adopt driver to drive by measured motor, loaded by measured motor by dynamometer machine, the output torque that utilizes torque sensor to record motor utilizes current sensor to record the winding current of motor, and then calculates moment coefficient; In parameter of synchronous machine the most difficult measurement be exactly hand over, the d-axis inductance, in the Electrical Motor teaching material, normally adopt the slip frequency method to come the unsaturated value of measurement synchronization motor, but its saturation value but is difficult to measure.
The method of testing subject matter of above-mentioned parameter of synchronous machine is: the measuring accuracy of friendship, d-axis inductance parameters is low; The method of testing complexity of moment coefficient, and measuring accuracy is low, and strong to the dependence of drive performance; Can not record each parameter simultaneously with a cover proving installation.
Summary of the invention
In order to solve low, the moment coefficient method of testing complexity of measuring accuracy of the ac-dc axis inductance parameters that exists in the method for testing that has parameter of synchronous machine now, and problem strong to the dependence of drive performance, that can not measure each parameter of acquisition simultaneously, the present invention proposes a kind of testing parameters of synchronous motor and realizes the device of this method.
The detailed process of testing parameters of synchronous motor of the present invention is:
Measure the friendship, the d-axis inductance L that obtain tested synchronous motor winding
q, L
d, detailed process is: give in any two-phase in three phase windings of tested synchronous motor and feed single-phase alternating current
The rotor that adopts external force to drag tested synchronous motor at the uniform velocity rotates a circle above, in tested synchronous motor rotary course, measure the voltage at energising winding two ends, and decomposition computation goes out the fundamental voltage effective value of measuring voltage, takes out the maximal value U in whole fundamental voltage effective values then
Max1, minimum value U
Min1, then the friendship axle of tested synchronous motor and d-axis inductance are respectively
With
Wherein, R
FaFor power frequency is
The time every phase winding AC resistance, R
Fa=kR
0a, k is the enhancement coefficient of winding resistance when considering kelvin effect, k 〉=1, R
0aSingle-phase winding D.C. resistance for tested synchronous motor;
Measure the moment coefficient K of tested synchronous motor
T, detailed process is: give and feed DC current I in any two-phase in three phase windings of tested synchronous motor
1, the rotor that adopts external force to drag tested synchronous motor at the uniform velocity rotates a circle above, measures and obtain maximum torque value T in tested synchronous motor rotary course
Max1, the moment coefficient of tested synchronous motor then
Be used to realize the device of above-mentioned testing parameters of synchronous motor, form by motor driver, data acquisition and controller, servo-driver, loading motor, torque/speed sensor, current sensor, voltage sensor, interchange programmable power supply and tested synchronous motor, motor driver is used for sending drive signal to tested synchronous motor under the control of data acquisition and controller, also be used for the parameter of described drive signal is sent to data acquisition and controller; Described data acquisition and controller are used to gather torque and tach signal, the current signal of current sensor transmission and the voltage signal that voltage sensor sends that the torque/speed sensor sends, and also are used to transmit control signal to servo-driver; Servo-driver is used for sending drive signal to loading motor under the control of data acquisition and controller; Loading motor is used to drag tested synchronous motor rotation; The torque/speed sensor is used to measure the rotating speed and the torque of tested synchronous motor; Exchanging programmable power supply is used for giving under the control of data acquisition and controller the winding of tested synchronous motor to feed electric current; Current sensor is used for measuring the current value in the tested synchronous motor winding; Voltage sensor is used for measuring the magnitude of voltage at tested synchronous motor winding two ends.
Method of testing of the present invention and device, can accurately measure the parameters of electric machine such as the winding resistance that obtains synchronous motor, winding inductance, back emf coefficient, moment coefficient, and system architecture is simple, easy to operate, especially when the winding inductance of measuring permagnetic synchronous motor and moment coefficient, of the influence of motor location torque can be effectively avoided, measuring accuracy can be improved greatly measurement result.
Description of drawings
The structural representation of testing parameters of synchronization electric motor device of the present invention during Fig. 1.Fig. 2 is in the embodiment one, measures friendship, the d-axis inductance L of tested synchronous motor winding
q, L
dProcess in, described motor windings energising synoptic diagram.Fig. 3 is embodiment two described direct current resistance R at every phase winding of measuring tested synchronous motor
0aProcess in, described motor windings energising synoptic diagram.Fig. 4 is that embodiment three is described at the back emf coefficient K that measures tested synchronous motor
EProcess in, the effective value E of electromotive force first-harmonic
0The measuring position synoptic diagram.
Embodiment
Embodiment one: the process of the described testing parameters of synchronous motor of present embodiment is:
Measure the friendship, the d-axis inductance L that obtain tested synchronous motor winding
q, L
d, detailed process is: give in any two-phase in three phase windings of tested synchronous motor and feed single-phase alternating current
The rotor that adopts external force to drag tested synchronous motor at the uniform velocity rotates a circle above, in tested synchronous motor rotary course, measure the voltage u at energising winding two ends, and decomposition computation goes out the fundamental voltage effective value of measuring voltage, takes out the maximal value U in whole fundamental voltage effective values then
Max1, minimum value U
Min1, then the friendship axle of tested synchronous motor and d-axis inductance are respectively
With
Wherein, R
FaFor power frequency is
The time every phase winding AC resistance, R
Fa=kR
0a, k is the enhancement coefficient of winding resistance when considering kelvin effect, k 〉=1, R
0aSingle-phase winding D.C. resistance for tested synchronous motor;
Measure the moment coefficient K of tested synchronous motor
T, detailed process is: give and feed DC current I in any two-phase in three phase windings of tested synchronous motor
1, the rotor that adopts external force to drag tested synchronous motor at the uniform velocity rotates a circle above, measures and obtain maximum torque value T in tested synchronous motor rotary course
Max1, the moment coefficient of tested synchronous motor then
In the process of the friendship of measuring tested synchronous motor, d-axis inductance, the rotating speed of described rotation is lower than 5 rev/mins.
At the moment coefficient K that measures tested synchronous motor
TProcess in, the rotating speed of described rotation is lower than 5 rev/mins.
Two inductance value that present embodiment obtains both can also can be the d-axis inductance for handing over the axle inductance respectively, and concrete condition need be according to being determined by the rotor structure of measured motor.
Three phase windings of the tested synchronous motor described in the present embodiment are Y-connection, referring to shown in Figure 2, and the single-phase alternating current that feeds in any two-phase in three phase windings of tested synchronous motor
That is: described single-phase alternating current i holds output from the input of B end, the C of three phase windings, measures the voltage u between B end and two end points of C end then.
Present embodiment is at the moment coefficient K that measures tested synchronous motor
TProcess in, feed DC current I in any two-phase in three phase windings
1, in like manner be meant described DC current I
1In the input of B end, C output.
When described winding is a dihedral when connecting, the equivalent circuit structure of those skilled in the art during according to test parameter also can calculate the friendship, the d-axis inductance L that obtain tested synchronous motor winding
q, L
dWith moment coefficient K
T
The described testing parameters of synchronous motor of present embodiment can be measured friendship, d-axis inductance and the moment coefficient that obtains tested synchronous motor simultaneously, and it is simple to have measuring method, it is little to the measurement result influence to measure the performance of using motor driver, the advantage that measuring accuracy is high.
Embodiment two: the described testing parameters of synchronous motor of present embodiment is on the basis of embodiment one described method of testing, has increased the direct current resistance R of every phase winding of measuring tested synchronous motor
0aStep, detailed process is: feed DC current I for any two phase windings in three phase windings of tested synchronous motor
0a, gather the DC voltage U that acquisition is connected with two phase winding two ends of DC current
0a, then the single-phase winding D.C. resistance of tested synchronous motor is:
Present embodiment is described to feed DC current I at any two-phase winding
0a,, be meant described DC current I referring to shown in Figure 3
0aHold output from the input of B end, the C of three phase windings, measure the DC voltage U between B end and two end points of C end then
0a
Embodiment three: the described testing parameters of synchronous motor of present embodiment is on the basis of embodiment one described method of testing, has increased the back emf coefficient K that measures tested synchronous motor
EStep, detailed process is: adopt external force to drag tested synchronous motor and at the uniform velocity rotate with rotation speed n, gather the effective value E of the electromotive force first-harmonic at any two phase winding two ends in the tested synchronous motor in tested synchronous motor rotary course
0, obtain the back emf coefficient of tested synchronous motor
The electromotive force at the described any two phase winding two ends of present embodiment referring to shown in Figure 4, is meant the electromotive force at two phase winding two ends, that is: the electromotive force between B end and the C end.
Can adopt servomotor to realize in the external force described in embodiment one or three, that is: adopt servomotor to drag and rotate by the rotor of measured motor.Servomotor has the high advantage of rotating speed control accuracy, can reach the purpose of the tested rotating speed of motor of accurate control, has guaranteed the precision of measurement result.
Embodiment four: the device that is used to realize embodiment one described testing parameters of synchronous motor, form by motor driver 1, data acquisition and controller 2, servo-driver 3, loading motor 4, torque/speed sensor 5, current sensor, voltage sensor, interchange programmable power supply and tested synchronous motor 9, motor driver 1 is used for sending drive signal to tested synchronous motor 9 under the control of data acquisition and controller 2, also be used for the parameter of described drive signal is sent to data acquisition and controller 2; Described data acquisition and controller 2 are used to gather torque and tach signal, the current signal of current sensor transmission and the voltage signal that voltage sensor sends that torque/speed sensor 5 sends, and also are used to transmit control signal to servo-driver 3; Servo-driver 3 is used for sending drive signal to loading motor 4 under the control of data acquisition and controller 2; Loading motor 4 is used to drag tested synchronous motor 9 rotations; Torque/speed sensor 5 is used to measure the rotating speed and the torque of tested synchronous motor 9; Exchanging programmable power supply is used for giving under the control of data acquisition and controller 2 winding of tested synchronous motor 9 to feed electric current; Current sensor is used for measuring the current value in tested synchronous motor 9 windings; Voltage sensor is used for measuring the magnitude of voltage at tested synchronous motor 9 winding two ends.
Adopt the process of the described device to test parameter of synchronous machine of present embodiment to be:
Measure the friendship, the d-axis inductance L that obtain tested synchronous motor 9 windings
q, L
dDetailed process be: give the single-phase alternating current that feeds in any two-phase of three phase windings of tested synchronous motor 9 by data acquisition and controller 2 control motor drivers 1
Dragging tested synchronous motor 9 by data acquisition and controller 2 control servo-drivers 3 driving loading motors 4 at the uniform velocity rotates a circle above, obtain the voltage signal at energising winding two ends in tested synchronous motor 9 rotary courses by voltage sensor, decomposition computation goes out the fundamental voltage effective value of described voltage signal then, and takes out the maximal value U in whole fundamental voltage effective values
Max1, minimum value U
Min1, the friendship axle and the d-axis inductance that obtain tested synchronous motor 9 are respectively
With
Wherein, R
FaFor power frequency is
The time every phase winding AC resistance, R
Fa=kR
0a, k is the enhancement coefficient of winding resistance when considering kelvin effect, k 〉=1.
In the process of the friendship of measuring tested synchronous motor 9, d-axis inductance, the rotating speed of described rotation is lower than 5 rev/mins.
Measure the moment coefficient K of tested synchronous motor 9
TDetailed process be: exchange programmable power supplies by 2 controls of data acquisition and controller and give in any two-phase in three phase windings of tested synchronous motor 9 and feed DC current I
1, drive loading motors 4 by data acquisition and controller 2 control servo-drivers 3 again and drag tested synchronous motor 9 and at the uniform velocity rotate a circle abovely, in tested synchronous motor 9 rotary courses, measure and obtain maximum torque value T by torque/speed sensor 5
Max1, the moment coefficient of tested synchronous motor 9
At the moment coefficient K that measures tested synchronous motor 9
TProcess in, the rotating speed of described rotation is lower than 5 rev/mins.
Two inductance value that present embodiment obtains both can also can be the d-axis inductance for handing over the axle inductance respectively, and concrete condition need be according to being determined by the rotor structure of measured motor.
Measure the direct current resistance R of every phase winding of tested synchronous motor 9
0aProcess be: exchange programmable power supplies by 2 controls of data acquisition and controller and feed DC current I for any two phase windings in three phase windings of tested synchronous motor 9
0a, obtain to be connected with the DC voltage U at two phase winding two ends of DC current by the voltage sensor collection
0a, the single-phase winding D.C. resistance of tested synchronous motor 9 is:
Measure the back emf coefficient K of motor
EProcess be: drive loading motors 4 by data acquisition and controller 2 control servo-drivers 3 and drag tested synchronous motor 9 and at the uniform velocity rotate with rotation speed n, in tested synchronous motor 9 rotary courses, obtain the effective value E of the electromotive force first-harmonic at any two phase winding two ends in the tested synchronous motor 9 by the voltage sensor collection
0, and then obtain the back emf coefficient of tested synchronous motor 9
The described testing parameters of synchronization electric motor device of present embodiment can be measured the parameters such as friendship, d-axis inductance and moment coefficient that obtain tested synchronous motor 9 as required simultaneously, have that apparatus structure is simple, measuring method is simple, it is little to the measurement result influence to measure the performance of using motor driver, the advantage that measuring accuracy is high.
In the described device of present embodiment, the nominal torque of loading motor 4 is greater than the nominal torque of tested synchronous motor 9; The maximum speed of loading motor 4 is higher than the rated speed of tested synchronous motor 9.Exchange the rated current of the maximum output current of programmable power supply greater than tested synchronous motor 9; There is not damping winding on the rotor of tested synchronous motor 9; Three phase windings of tested synchronous motor 9 are Y-connection.
Loading motor 4 in the present embodiment is selected servomotor for use.Servomotor has the high advantage of rotating speed control accuracy, can reach the purpose of the tested rotating speed of motor of accurate control, has guaranteed the precision of measurement result.
Claims (10)
1, testing parameters of synchronous motor is characterized in that its detailed process is:
Measure the friendship, the d-axis inductance L that obtain tested synchronous motor winding
q, L
d, detailed process is: give in any two-phase in three phase windings of tested synchronous motor and feed single-phase alternating current
The rotor that adopts external force to drag tested synchronous motor at the uniform velocity rotates a circle above, in tested synchronous motor rotary course, measure the voltage at energising winding two ends, and decomposition computation goes out the fundamental voltage effective value of measuring voltage, takes out the maximal value U in whole fundamental voltage effective values then
Max1, minimum value U
Min1, then the friendship axle of tested synchronous motor and d-axis inductance are respectively
With
Wherein, R
FaFor power frequency is
The time every phase winding AC resistance, R
Fa=kR
0a, k is the enhancement coefficient of winding resistance when considering kelvin effect, k 〉=1, R
0aSingle-phase winding D.C. resistance for tested synchronous motor;
Measure the moment coefficient K of tested synchronous motor
T, detailed process is: give and feed DC current I in any two-phase in three phase windings of tested synchronous motor
1, the rotor that adopts external force to drag tested synchronous motor at the uniform velocity rotates a circle above, measures and obtain maximum torque value T in tested synchronous motor rotary course
Max1, the moment coefficient of tested synchronous motor then
2, testing parameters of synchronous motor according to claim 1 is characterized in that, in the process of the friendship of measuring tested synchronous motor, d-axis inductance, the rotating speed of described rotation is lower than 5 rev/mins; At the moment coefficient K that measures tested synchronous motor
TProcess in, the rotating speed of described rotation is lower than 5 rev/mins.
3, testing parameters of synchronous motor according to claim 1 is characterized in that, the direct current resistance R of every phase winding of described tested synchronous motor
0aMeasuring process be: feed DC current I for any two phase windings in three phase windings of tested synchronous motor
0a, gather the DC voltage U that acquisition is connected with two phase winding two ends of DC current
0a, then the single-phase winding D.C. resistance of tested synchronous motor is:
4, testing parameters of synchronous motor according to claim 1 is characterized in that, it also comprises the back emf coefficient K that measures tested synchronous motor
EStep, detailed process is: adopt external force to drag tested synchronous motor and at the uniform velocity rotate with rotation speed n, gather the effective value E of the electromotive force first-harmonic at any two phase winding two ends in the tested synchronous motor in tested synchronous motor rotary course
0, obtain the back emf coefficient of tested synchronous motor
5,, it is characterized in that described external force adopts servomotor to realize, that is: adopt servomotor to drag by the rotor of measured motor and rotate according to claim 1 or 4 described testing parameters of synchronous motor.
6, be used to realize the device of the described testing parameters of synchronous motor of the arbitrary claim of claim 1 to 4, it is characterized in that described device is by motor driver (1), data acquisition and controller (2), servo-driver (3), loading motor (4), torque/speed sensor (5), current sensor, voltage sensor, exchanging programmable power supply and tested synchronous motor (9) forms, motor driver (1) is used for sending drive signal to tested synchronous motor (9) under the control of data acquisition and controller (2), also be used for the parameter of described drive signal is sent to data acquisition and controller (2); Described data acquisition and controller (2) are used to gather torque and tach signal, the current signal of current sensor transmission and the voltage signal that voltage sensor sends that torque/speed sensor (5) sends, and also are used to transmit control signal to servo-driver (3); Servo-driver (3) is used for sending drive signal to loading motor (4) under the control of data acquisition and controller (2); Loading motor (4) is used to drag tested synchronous motor (9) rotation; Torque/speed sensor (5) is used to measure the rotating speed and the torque of tested synchronous motor (9); Exchanging programmable power supply is used for giving under the control of data acquisition and controller (2) winding of tested synchronous motor (9) to feed electric current; Current sensor is used for measuring the current value in tested synchronous motor (9) winding; Voltage sensor is used for measuring the magnitude of voltage at tested synchronous motor (9) winding two ends.
7, testing parameters of synchronization electric motor device according to claim 6 is characterized in that, the nominal torque of described loading motor (4) is greater than the nominal torque of tested synchronous motor (9); The maximum speed of loading motor (4) is higher than the rated speed of tested synchronous motor (9).
8, testing parameters of synchronization electric motor device according to claim 6 is characterized in that, the maximum output current of described interchange programmable power supply is greater than the rated current of tested synchronous motor (9).
9, testing parameters of synchronization electric motor device according to claim 6 is characterized in that, three phase windings of tested synchronous motor (9) are Y-connection.
10, testing parameters of synchronization electric motor device according to claim 6 is characterized in that, described loading motor (4) is a servomotor.
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