CN101561468A - Method for testing saturated inductance of switched reluctance motor - Google Patents

Abstract

The invention provides a method for testing saturated inductance of a switched reluctance motor, belongs to the field of motor testing, and aims to solve the problem that the saturated inductance of the switched reluctance motor measured by the prior LCR meter has large error. The method is to change and fix the rotor position of the switched reluctance motor through a stepped motor, and load pulsating direct current for a phase winding of the switched reluctance motor, wherein the loaded pulsating direct current is serially synthesized by a direct current source and an alternate current source, and pulsates close to rated current of the switched reluctance motor; a computer acquires a current signal and a voltage signal of the phase winding through a current sensor and a voltage sensor, calculates the saturated inductance when the rotor is positioned at certain fixed angle, controls the stepped motor to rotate according to the stepping angle, and measures the saturated inductances in different rotor positions by the method. The method is used for measuring the saturated inductance of the switched reluctance motor.

Description

Method for testing saturated inductance of switched reluctance motor

Technical field

The present invention relates to method for testing saturated inductance of switched reluctance motor, belongs to the electromechanical testing field.

Background technology

Switched reluctance machines is simple in structure owing to having, control is convenient, high, the low cost and other advantages of unfailing performance, has now obtained the attention and the approval of all trades and professions.And switched reluctance machines is a kind of motor of high magnetic saturation work, and its parameter is non-linear.The inductance parameters of motor particularly, the inductance of motor is not only relevant with motor rotor position, and is simultaneously current related with motor windings.The LCR table (LCR is measured table) that tradition adopts is measured the motor inductance, has ignored the non-linear of motor saturation characteristic and inductance, and evaluation has caused significant errors to motor performance.The measurement of saturated inductance of switched reluctance motor, to the motor body design and optimization, the overall performance of motor speed regulation system seems most important, adopts the pulsactor error of traditional LC R table measuring switch reluctance motor big, can't accurately obtain the numerical value of pulsactor.

Summary of the invention

The objective of the invention is to solve and adopt the big problem of traditional LC R table measuring switch reluctance motor inductance error, method for testing saturated inductance of switched reluctance motor is provided.

The device that the inventive method is used comprises switched reluctance machines, ac current source, DC current source, switch, current sensor, voltage sensor, computing machine, stepper motor and controllor for step-by-step motor, after connecting successively, ac current source, DC current source and switch be carried in the two ends of the phase winding of switched reluctance machines

Current sensor is gathered the current signal of phase winding and is exported to computing machine, and voltage sensor is gathered the voltage signal at phase winding two ends and exported to computing machine,

The output terminal of controllor for step-by-step motor links to each other with the Stepping Motor Control end, and the output shaft of stepper motor is fixedlyed connected with the armature spindle of switched reluctance machines,

Method for testing saturated inductance of switched reluctance motor may further comprise the steps:

Step 1, setting n are the variable of the rotor measurement position of switched reluctance machines, and are initialized as n=1;

Step 2, stepping angle θ of controllor for step-by-step motor control step motor rotation _b, the armature spindle of fixedlying connected with stepper motor makes the rotor of switched reluctance machines be fixed on measuring position θ _n, 0≤θ _n≤ 360 °;

Step 3, Closing Switch, the synthetic pulsating direct current of the ac current source of series connection and DC current source loads the phase winding to switched reluctance machines;

Step 4, computing machine are gathered the current signal of phase winding by current sensor, and computing machine is gathered the voltage signal at phase winding two ends by voltage sensor;

Step 5, computing machine obtain the rotor of switched reluctance machines at measuring position θ by following formula _nThe time pulsactor L:

$L=\frac{1}{100\mathrm{\&pi;}}\sqrt{{\left(\frac{U}{I}\right)}^2-{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="A20091007209300101.png"\; state="\{\{state\}\}">R</figure-callout>}}^2}$

Wherein, U is the voltage effective value at phase winding two ends,

I is the current effective value of phase winding,

R is the equivalent resistance of phase winding,

Step 6, judge whether to satisfy n * θ _b≤ 360 °,

Judged result is for being, n=n+1, and execution in step two, judged result is finished and is obtained switched reluctance machines different rotor position pulsactor for not.

Advantage of the present invention: the pulsactor during the switched reluctance machines diverse location is accurately measured, the measuring accuracy height, and measuring method is simple.

Description of drawings

Fig. 1 is the inventive method process flow diagram, Fig. 2 is a measurement mechanism structural representation of the present invention, Fig. 3 is the waveform synoptic diagram of DC current source output current, and Fig. 4 is the waveform synoptic diagram of ac current source output current, and Fig. 5 is a current waveform synoptic diagram synthetic after DC current source is connected with ac current source.

Embodiment

Embodiment one: present embodiment is described below in conjunction with Fig. 1 to Fig. 5, the device that the present embodiment method is used comprises switched reluctance machines, ac current source 3, DC current source 4, switch 5, current sensor 6, voltage sensor 7, computing machine 8, stepper motor 9 and controllor for step-by-step motor 10, after connecting successively, ac current source 3, DC current source 4 and switch 5 be carried in the two ends of the phase winding 1 of switched reluctance machines

Current sensor 6 is gathered the current signal of phase winding 1 and is exported to computing machine 8, and voltage sensor 7 is gathered the voltage signal at phase winding 1 two ends and exported to computing machine 8,

The output terminal of controllor for step-by-step motor 10 links to each other with the control end of stepper motor 9, and the output shaft of stepper motor 9 is fixedlyed connected with the armature spindle of switched reluctance machines 2,

Method for testing saturated inductance of switched reluctance motor may further comprise the steps:

Step 1, setting n are the variable of the rotor measurement position of switched reluctance machines, and are initialized as n=1;

Step 2, stepping angle θ of controllor for step-by-step motor 10 control step motors, 9 rotations _b, the armature spindle 2 of fixedlying connected with stepper motor 9 makes the rotor of switched reluctance machines be fixed on measuring position θ _n, 0≤θ _n≤ 360 °;

Step 3, Closing Switch 5, the ac current source 3 of series connection and DC current source 4 synthetic pulsating direct currents load the phase winding 1 to switched reluctance machines;

Step 4, computing machine 8 pass through the current signal that current sensor 6 is gathered phase windings 1, and computing machine 8 is gathered the voltage signal at phase windings 1 two ends by voltage sensor 7;

Step 5, computing machine 8 obtain the rotor of switched reluctance machines at measuring position θ by following formula _nThe time pulsactor L:

$L=\frac{1}{100\mathrm{\&pi;}}\sqrt{{\left(\frac{U}{I}\right)}^2-{\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="A20091007209300101.png"\; state="\{\{state\}\}">R</figure-callout>}}^2}$

Wherein, U is the voltage effective value at phase winding 1 two ends,

I is the current effective value of phase winding 1,

R is the equivalent resistance of phase winding 1,

Step 6, judge whether to satisfy n * θ _b≤ 360 °,

Judged result is for being, n=n+1, and execution in step two, judged result is finished and is obtained switched reluctance machines different rotor position pulsactor for not.

In the present embodiment phase winding 1 two ends of switched reluctance machines are connected the ac current source 3 and the DC current source 4 of series connection, and whether load with switch 5 control ac current sources 3 and DC current source 4, the electric current of DC current source 4 outputs is the rated current I of switched reluctance machines _e, ac current source 3 output frequencies are the sinusoidal current of 50Hz, the amplitude A of described sinusoidal current is the rated current I of switched reluctance machines _e3%～5%.The electric current of DC current source 4 output as shown in Figure 3, the interchange of ac current source 3 outputs as shown in Figure 4, the synthetic electric current of DC current source 4 and ac current source 3 is rated current I as shown in Figure 5 _eNear pulsating direct current wherein contains alternating component.DC current source 4 and ac current source 3 synthetic pulsating direct currents are input in the phase winding 1, and phase winding 1 is operated in the rated current I of switched reluctance machines in the present embodiment _eNear, allow the inductance of phase winding 1 be in state of saturation.

Current sensor 6 is measured is current signal in the phase winding 1, what voltage sensor 7 was measured is the voltage signal at phase winding 1 two ends, current signal that measures and voltage signal output in the computing machine 8, and computing machine 8 is tried to achieve the pulsactor L of switched reluctance machines this moment by formula (1):

$L=\frac{1}{100\mathrm{\&pi;}}\sqrt{{\left(\frac{U}{I}\right)}^2-R^2}---\left(1\right)$

Wherein, U is the voltage effective value at phase winding 1 two ends,

I is the current effective value of phase winding 1,

R is the equivalent resistance of phase winding 1, can record by the LCR table,

The electric current that is input in the phase winding 1 is the dc pulse electric current that contains alternating component, according to voltage equation as can be known:

$\stackrel{\&CenterDot;}{U}=\stackrel{\&CenterDot;}{I}\&times;R+\mathrm{j\&omega;L}\&times;\stackrel{\&CenterDot;}{I}---\left(2\right)$

Arrangement can get:

${\left(\frac{U}{I}\right)}^2=R^2+{\left(\mathrm{\&omega;L}\right)}^2---\left(3\right)$

Because the frequency of ac current source 3 is 50Hz, so:

ω＝2πf＝2π×50＝100π (4)

After formula (4) substitution formula (3) and arrangement, obtain formula (1).

The inductance of switched reluctance machines is non-linear, rotor-position not simultaneously, the pulsactor difference in the present embodiment, is at first set n=1, this moment switched reluctance machines rotor-position be θ ₁, the determining of rotor-position is easy to, and zero-bit is changed to predefined, the angle information that the position that can obtain to arrive after the rotor rotation is determined.The rotor that this method relates to can begin rotation from zero position, in order to obtain the pulsactor information of the motor of universe in the rotor 360 degree scopes, as long as allow the stepper motor 9 of control rotor rotation rotate 360 degree.

Controllor for step-by-step motor 10 control step motors 9 rotate, and the stepping angle of each rotation is θ _b, the output shaft of stepper motor 9 is fixedlyed connected with the armature spindle of switched reluctance machines 2, that is, and and a stepping angle of stepper motor 9 every rotations θ _b, switched reluctance machines is also followed anglec of rotation θ _b, promptly when n=2, the rotor-position of switched reluctance machines is θ ₁+ θ _b, the rest may be inferred, obtains the pulsactor of the motor of universe in the 360 degree scopes according to formula (1).

Phase winding 1 is set at the A phase winding in the present embodiment.

And switched reluctance machines is a kind of motor of high magnetic saturation work, and its parameter is non-linear.The inductance parameters of motor particularly, the inductance of motor is not only relevant with motor rotor position, and is simultaneously current related with motor windings.When adopting the inductance of traditional LCR table measuring switch reluctance motor, just load an ac current source 3 at the two ends of phase winding 1, the data that measure are a plurality of instantaneous inductors, judgement from a large amount of instantaneous inductor data, the pulsactor when extracting certain position of rotor also need a large amount of work, and the inventive method makes ac current source 3 and DC current source 4 series connection, synthetic pulsating direct current is input in the phase winding 1, and described pulsating direct current is operated in the rated current I of tested switched reluctance machines _eNear, like this, the inductance of the phase winding 1 of switched reluctance machines is in state of saturation always, makes the result who measures than adopting traditional LCR table accurately.

Claims (3)

1, method for testing saturated inductance of switched reluctance motor, the device that this method is used comprises switched reluctance machines, ac current source (3), DC current source (4), switch (5), current sensor (6), voltage sensor (7), computing machine (8), stepper motor (9) and controllor for step-by-step motor (10), after connecting successively, ac current source (3), DC current source (4) and switch (5) be carried in the two ends of the phase winding (1) of switched reluctance machines

Current sensor (6) is gathered the current signal of phase winding (1) and is exported to computing machine (8), and voltage sensor (7) is gathered the voltage signal at phase winding (1) two ends and exported to computing machine (8),

The output terminal of controllor for step-by-step motor (10) links to each other with the control end of stepper motor (9), and the output shaft of stepper motor (9) is fixedlyed connected with the armature spindle (2) of switched reluctance machines,

It is characterized in that method for testing saturated inductance of switched reluctance motor may further comprise the steps:

Step 1, setting n are the variable of the rotor measurement position of switched reluctance machines, and are initialized as n=1;

Step 2, stepping angle θ of controllor for step-by-step motor (10) control step motor (9) rotation _b, the armature spindle (2) of fixedlying connected with stepper motor (9) makes the rotor of switched reluctance machines be fixed on measuring position θ _n, 0≤θ _n≤ 360 °;

Step 3, Closing Switch (5), the synthetic pulsating direct current of ac current source of series connection (3) and DC current source (4) loads the phase winding (1) to switched reluctance machines;

Step 4, computing machine (8) pass through the current signal that current sensor (6) is gathered phase winding (1), and computing machine (8) is gathered the voltage signal at phase winding (1) two ends by voltage sensor (7);

Step 5, computing machine (8) obtain the rotor of switched reluctance machines at measuring position θ by following formula _nThe time pulsactor L:

$L=\frac{1}{100\mathrm{\&pi;}}\sqrt{{\left(\frac{U}{I}\right)}^2-R^2}$

Wherein, U is the voltage effective value at phase winding (1) two ends,

I is the current effective value of phase winding (1),

R is the equivalent resistance of phase winding (1),

Step 6, judge whether to satisfy n * θ _b≤ 360 °,

Judged result is for being, n=n+1, and execution in step two, judged result is finished and is obtained switched reluctance machines different rotor position pulsactor for not.

2, method for testing saturated inductance of switched reluctance motor according to claim 1 is characterized in that: the electric current of DC current source (4) output is the rated current I of switched reluctance machines _e

3, method for testing saturated inductance of switched reluctance motor according to claim 1 is characterized in that: ac current source (3) output frequency is the sinusoidal current of 50Hz, and the amplitude A of described sinusoidal current is the rated current I of switched reluctance machines _e3%～5%.

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