CN112285430A - Motor inductance measuring method - Google Patents
Motor inductance measuring method Download PDFInfo
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- CN112285430A CN112285430A CN202011090342.9A CN202011090342A CN112285430A CN 112285430 A CN112285430 A CN 112285430A CN 202011090342 A CN202011090342 A CN 202011090342A CN 112285430 A CN112285430 A CN 112285430A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000004907 flux Effects 0.000 claims abstract description 23
- 238000005259 measurement Methods 0.000 claims abstract description 10
- 238000000691 measurement method Methods 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims description 9
- 230000010354 integration Effects 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000004804 winding Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/26—Measuring inductance or capacitance; Measuring quality factor, e.g. by using the resonance method; Measuring loss factor; Measuring dielectric constants ; Measuring impedance or related variables
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- General Physics & Mathematics (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention belongs to the technical field of inductance measurement, and discloses a motor inductance measurement method, which is applied to the measurement of the inductance value of a permanent magnet motor, wherein the permanent magnet motor comprises an inductor, and the method comprises the following steps: firstly, a flux linkage A generated when current passes through the inductor is calculated, the inductor is short-circuited by using a resistor, voltages at two ends of the resistor are integrated, A is calculated by a formula, and then the inductance value L of the permanent magnet motor is calculated by the formula. Compared with the prior art, the motor inductance measuring method disclosed by the invention adopts the principle of a voltage integration method to measure the inductance parameters of the motor. Based on the current value, the value of the generated flux linkage, and the relationship between the current value and the value of the generated flux linkage when current flows in the inductor, the motor inductance value is indirectly measured by utilizing a resistor to short circuit the inductor and integrating the voltage at two ends of the resistor to calculate the value of the flux linkage. The reliability of the implementation process is good, errors can be effectively avoided, and the performance of the motor can be accurately evaluated.
Description
Technical Field
The invention belongs to the technical field of inductance measurement, and particularly relates to a motor inductance measurement method.
Background
The alternating current permanent magnet synchronous motor has the characteristics of simple structure, reliable operation, small volume, low loss and the like, and is widely applied to the technical fields of numerical control machines, industrial robots and the like. The inductance parameter is nonlinear, and the inductance value is related to the position of the motor rotor, namely the current of the motor winding. In the related art, a method for measuring the inductance of the motor by using the LCR meter has large errors, and the performance of the motor cannot be accurately evaluated.
Therefore, there is a need to provide a new method for measuring inductance of a motor to solve the above-mentioned technical problems.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the method for accurately measuring the inductance of the motor is provided.
In order to solve the technical problems, the technical scheme of the invention is as follows: a motor inductance measurement method is applied to measurement of inductance value of a permanent magnet motor, the permanent magnet motor comprises an inductor, and the method comprises the following steps: firstly, calculating a flux linkage A generated when current passes through the inductor, short-circuiting the inductor by using a resistor, integrating the voltage at two ends of the resistor, calculating A by the following formula,
in the formula: u is the instantaneous voltage value on the resistor in the loop; then the inductance value L of the permanent magnet motor is calculated by the following formula,
in the formula: i is the initial current value.
Preferably, the method for determining the instantaneous voltage value u across the resistor in the loop is as follows: the resistance is provided with n sampling points of instantaneous voltage, discrete voltage signals are formed through the n sampling points of the instantaneous voltage, and the discrete voltage signals are integrated to obtain a flux linkage A.
Preferably, u is obtained by directly measuring the voltage across the resistor by a voltmeter.
Preferably, the current i passing through the resistor is measured by an ammeter, and u, u-i R is calculated by a formula, wherein R is the resistance value of the resistor.
Compared with the prior art, the motor inductance measuring method has the following beneficial effects:
(1) the invention relates to a motor inductance measuring method, which indirectly measures the motor inductance value by utilizing a resistor to short circuit an inductor and integrating the voltage at two ends of the resistor to calculate the value of a flux linkage based on the relationship between the current value, the value of a generated flux linkage and the inductance value when current flows in the inductor. The reliability of the implementation process is good, errors can be effectively avoided, and the performance of the motor can be accurately evaluated.
(2) The invention also discloses a technical scheme for forming a discrete voltage signal by setting a plurality of sampling points and obtaining a flux linkage by integrating the discrete voltage signal. By the scheme, the accuracy of the flux linkage value is improved, and the accuracy of the inductance value is further improved.
(3) The invention also discloses various voltage value acquisition modes in the motor inductance measurement method, which can improve the implementation flexibility in measurement operation.
Detailed Description
The present invention will be described in detail with reference to the following embodiments in order to make the aforementioned objects, features and advantages of the invention more comprehensible. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, e.g., as being fixed or detachable or integrally connected; the two elements may be mechanically or electrically connected, directly or indirectly connected through an intermediate medium, or connected through the inside of the two elements, or "in transmission connection", that is, connected in a power manner through various suitable manners such as belt transmission, gear transmission, or sprocket transmission. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
A motor inductance measurement method is applied to measurement of inductance value of a permanent magnet motor, the permanent magnet motor comprises an inductor, and the method comprises the following steps: firstly, calculating a flux linkage A generated when current passes through the inductor, short-circuiting the inductor by using a resistor, integrating the voltage at two ends of the resistor, calculating A by the following formula,
in the formula: u is the instantaneous voltage value on the resistor in the loop; then the inductance value L of the permanent magnet motor is calculated by the following formula,
in the formula: i is the initial current value.
In the embodiment, because the resistance of the stator winding is small, the voltage on the stator winding is small and difficult to measure, the inductance is short-circuited by the resistance, and the voltages at two ends of the resistance are integrated, so that the technical problem that the direct measurement mode is difficult to measure accurately is solved by the method. And more accurate flux linkage values are obtained. The invention relates to a motor inductance measuring method, which indirectly measures the motor inductance value by utilizing a resistor to short circuit an inductor and integrating the voltage at two ends of the resistor to calculate the value of a flux linkage based on the relationship between the current value, the value of a generated flux linkage and the inductance value when current flows in the inductor. The reliability of the implementation process is good, errors can be effectively avoided, and the performance of the motor can be accurately evaluated.
Further, as another embodiment of the present invention, a method for determining an instantaneous voltage value u across the resistor in the loop is as follows: the resistance is provided with n sampling points of instantaneous voltage, discrete voltage signals are formed through the n sampling points of the instantaneous voltage, and the discrete voltage signals are integrated to obtain a flux linkage A. The invention discloses a technical scheme for obtaining a flux linkage by setting a plurality of sampling points to form a discrete voltage signal and integrating the discrete voltage signal. By the scheme, the accuracy of the flux linkage value is improved, and the accuracy of the inductance value is further improved.
Further, as another embodiment of the present invention, u is obtained by directly measuring the voltage across the resistor by a voltmeter. Of course, the present invention also provides another embodiment for obtaining u value, specifically: and measuring the current i passing through the resistor by using an ammeter, and calculating u, i and R by using a formula, wherein R is the resistance value of the resistor. Namely: the invention discloses a method for measuring the inductance of a motor, which can improve the implementation flexibility during the measurement operation by disclosing various modes for acquiring a voltage value.
Compared with the prior art, the motor inductance measuring method disclosed by the invention adopts the principle of a voltage integration method to measure the inductance parameters of the motor. The principle is simple, the operation is convenient, and the implementation is facilitated. Compared with the prior art, the motor inductance measuring method has the following beneficial effects:
(1) the invention relates to a motor inductance measuring method, which indirectly measures the motor inductance value by utilizing a resistor to short circuit an inductor and integrating the voltage at two ends of the resistor to calculate the value of a flux linkage based on the relationship between the current value, the value of a generated flux linkage and the inductance value when current flows in the inductor. The reliability of the implementation process is good, errors can be effectively avoided, and the performance of the motor can be accurately evaluated.
(2) The invention also discloses a technical scheme for forming a discrete voltage signal by setting a plurality of sampling points and obtaining a flux linkage by integrating the discrete voltage signal. By the scheme, the accuracy of the flux linkage value is improved, and the accuracy of the inductance value is further improved.
(3) The invention also discloses various voltage value acquisition modes in the motor inductance measurement method, which can improve the implementation flexibility in measurement operation.
Although the embodiments of the present invention have been described, various modifications and changes may be made by those skilled in the art without departing from the spirit and scope of the present invention, and such modifications and changes fall within the scope defined by the appended claims.
Claims (4)
1. A motor inductance measurement method is applied to measurement of inductance value of a permanent magnet motor, the permanent magnet motor comprises an inductor, and the method is characterized by comprising the following steps: firstly, calculating a flux linkage A generated when current passes through the inductor, short-circuiting the inductor by using a resistor, integrating the voltage at two ends of the resistor, calculating A by the following formula,
in the formula: u is the instantaneous voltage value on the resistor in the loop;
then the inductance value L of the permanent magnet motor is calculated by the following formula,
in the formula: i is the initial current value.
2. A method of measuring the inductance of an electric machine according to claim 1, characterized in that the instantaneous voltage value u across the resistance in the circuit is determined as follows: the resistance is provided with n sampling points of instantaneous voltage, discrete voltage signals are formed through the n sampling points of the instantaneous voltage, and the discrete voltage signals are integrated to obtain a flux linkage A.
3. The motor inductance measurement method of claim 1, wherein u is obtained by directly measuring the voltage across the resistor with a voltmeter.
4. The method of claim 1, wherein the current i through the resistor is measured by an ammeter, and u, i, R is calculated by a formula, wherein R is the resistance of the resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011090342.9A CN112285430A (en) | 2020-10-13 | 2020-10-13 | Motor inductance measuring method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011090342.9A CN112285430A (en) | 2020-10-13 | 2020-10-13 | Motor inductance measuring method |
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| CN112285430A true CN112285430A (en) | 2021-01-29 |
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| CN202011090342.9A Pending CN112285430A (en) | 2020-10-13 | 2020-10-13 | Motor inductance measuring method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1710439A (en) * | 2005-05-30 | 2005-12-21 | 沈阳工业大学 | Apparatus for testing reactance parameter of permanent magnet motor based on voltage integration |
| CN106199208A (en) * | 2016-08-23 | 2016-12-07 | 金陵科技学院 | A kind of permagnetic synchronous motor ac-dc axis inductance measurement device and method |
| CN107437913A (en) * | 2017-07-26 | 2017-12-05 | 华中科技大学 | A kind of permanent-magnetic electric machine inductance measuring method |
-
2020
- 2020-10-13 CN CN202011090342.9A patent/CN112285430A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1710439A (en) * | 2005-05-30 | 2005-12-21 | 沈阳工业大学 | Apparatus for testing reactance parameter of permanent magnet motor based on voltage integration |
| CN106199208A (en) * | 2016-08-23 | 2016-12-07 | 金陵科技学院 | A kind of permagnetic synchronous motor ac-dc axis inductance measurement device and method |
| CN107437913A (en) * | 2017-07-26 | 2017-12-05 | 华中科技大学 | A kind of permanent-magnetic electric machine inductance measuring method |
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