CN116626535A - Fault detection method and system for rotary transformer system - Google Patents

Fault detection method and system for rotary transformer system Download PDF

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Publication number
CN116626535A
CN116626535A CN202310470862.XA CN202310470862A CN116626535A CN 116626535 A CN116626535 A CN 116626535A CN 202310470862 A CN202310470862 A CN 202310470862A CN 116626535 A CN116626535 A CN 116626535A
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CN
China
Prior art keywords
coil
fault
voltage
feedback
fault detection
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Pending
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CN202310470862.XA
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Chinese (zh)
Inventor
田会峰
黄毅
刘乾
郑艳芳
李雪宝
罗小虎
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Jiangsu University of Science and Technology
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Jiangsu University of Science and Technology
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Priority to CN202310470862.XA priority Critical patent/CN116626535A/en
Publication of CN116626535A publication Critical patent/CN116626535A/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/54—Testing for continuity
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
    • G01R31/62—Testing of transformers

Abstract

The invention discloses a fault detection system of a rotary transformer system, which comprises: the device comprises a coil fault detection module, a coil feedback fault detection module and a rotor detection module; the coil fault detection module is used for detecting whether the exciting coil, the sine coil and the cosine coil have a broken line fault and an impedance abnormal fault; the coil feedback fault detection module is used for detecting whether the feedback of the rotary transformer is normal or not; and the rotor detection module is used for detecting whether the rotor of the rotary transformer has faults or not. The invention realizes the detection of the stator coil of the rotary transformer and the rotor of the rotary transformer, and compared with the traditional detection method, the invention carries out more comprehensive detection, expands the detection range and shortens the detection time.

Description

Fault detection method and system for rotary transformer system
Technical Field
The invention relates to the field of rotary transformers, in particular to a fault detection method and system of a rotary transformer system.
Background
The rotary transformer has the advantages of high precision, high reliability, high temperature resistance and the like. Therefore, the resolver is widely used in the field of motor control.
The conventional resolver system fault detection scheme detects the amplitude state of the output signal. In a conventional detection scheme, a first output signal and a second output signal of a rotary transformer are generally collected, then the change condition of amplitude states of the first output signal and the second output signal within a set time is respectively determined, and finally whether disconnection faults occur on a transmission line of the first output signal and a transmission line of the second output signal are detected according to the change condition of the amplitude states of the first output signal and the second output signal within the set time. However, this scheme can only detect partial signal faults of the resolver, has low fault detection coverage, and cannot detect other faults than disconnection faults. Therefore, the traditional fault detection scheme cannot comprehensively and accurately detect the faults of the system, and the risk of motor out-of-control exists.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a fault detection method and a fault detection system of a rotary transformer system, which are used for solving the problems that the fault detection of the traditional rotary transformer system is incomplete and the system fault cannot be accurately detected.
The invention provides a fault detection method of a rotary transformer system, which comprises the following steps:
a resolver coil fault detection process, a resolver rotor fault detection process;
wherein, the liquid crystal display device comprises a liquid crystal display device,
the resolver coil fault detection process includes:
one end of the coil is connected with an external voltage dividing circuit, external voltage is applied to two ends of the coil and the external voltage dividing circuit, and whether the coil has a disconnection fault is judged through the relation between the voltage between the coil and the external voltage dividing circuit and the external voltage; calculating the impedance of the coil through the voltage between the coil and the external voltage dividing circuit and the external voltage to judge whether the coil has an impedance abnormal fault or not;
calculating the distortion rate of the sine feedback voltage waveform and the distortion rate of the cosine feedback voltage waveform by using a sampling method, and judging whether the rotary transformer has feedback faults or not according to the relation between the distortion rate and a preset threshold value;
the resolver rotor fault detection process includes:
and judging whether the rotor of the rotary transformer has jump faults or not by using a fixed sampling frequency sampling method through the angle variation quantity of two adjacent sampling.
Optionally, the coil includes: excitation coil, sine coil, cosine coil.
Optionally, the specific method for judging whether the coil has the disconnection fault is as follows:
the coil is connected in series with a resistor serving as an external voltage dividing circuit, the positive electrode of the resistor is connected with the positive electrode of an external voltage, the negative electrode of the coil is connected with the negative electrode of the external voltage, the voltage between the coil and the resistor is obtained to be a test voltage, and when the voltage value of the test voltage is equal to that of the external voltage, the coil has a broken line fault.
Optionally, the specific method for judging whether the coil has the abnormal impedance fault is as follows:
the coil is connected in series with a resistor serving as an external voltage dividing circuit, the positive electrode of the resistor is connected with the positive electrode of external voltage, the negative electrode of the coil is connected with the negative electrode of the external voltage, the voltage between the coil and the resistor is obtained as test voltage, and the impedance of the coil is calculated through the following formula:
in the formula, "V CC "voltage value of external voltage," V DC "is the voltage value of the test voltage," R "is the resistance value of the resistor;
when (when)There is an impedance anomaly fault in the coil.
Optionally, when the impedance of the sine coil and the impedance of the cosine coil are both smaller than the impedance of the excitation coil, an impedance anomaly fault exists in the coils.
Optionally, the step of calculating the distortion rate of the sine feedback voltage waveform and the distortion rate of the cosine feedback voltage waveform by using the sampling method includes the following steps:
step A1: applying an excitation signal to the excitation coil and rotating the rotary transformer at a constant speed;
step A2: respectively collecting peak-to-peak values of a plurality of sine feedback voltages and peak-to-peak values of a plurality of cosine feedback voltages, and calculating the distortion rate of the feedback voltages through the following formula:
wherein U is 1 Peak-to-peak value of the 1 st feedback voltage; to U (U) i Is the peak-to-peak value of the ith feedback voltage.
Optionally, the specific method for judging whether the rotary transformer has the feedback fault according to the relation between the distortion rate and the preset threshold value is as follows:
when the distortion rate of the sine feedback voltage or the distortion rate of the cosine feedback voltage is more than 5%, the rotary transformer has feedback faults.
Optionally, the specific method for judging whether the rotor of the rotary transformer has jump faults is as follows:
applying an excitation signal to the excitation coil and rotating the resolver at a constant speed, wherein the constant speed is:
t
in the formula, "U R "is the voltage value of the excitation signal"U" is the amplitude of the excitation signal and "t" is time;
sampling sine feedback voltage and cosine feedback voltage, obtaining angles, calculating angular speed by using the increment angle of the current sampling angle compared with the previous sampling angle,
when the angular speed is smaller than the constant speed, the reverse jump fault is generated;
and when the angular speed is more than or equal to twice of the fixed speed, the fault is a double angle jump fault.
The invention also provides a fault detection system of the rotary transformer system, comprising: the device comprises a coil fault detection module, a coil feedback fault detection module and a rotor detection module;
the coil fault detection module is used for detecting whether the exciting coil, the sine coil and the cosine coil have a broken line fault and an impedance abnormal fault; a coil fault detection module comprising: a coil external voltage detection unit, a coil short circuit fault judgment unit and a coil impedance fault judgment unit;
the coil feedback fault detection module is used for detecting whether the feedback of the rotary transformer is normal or not; a coil feedback fault detection module comprising: a feedback voltage distortion rate calculation unit and a feedback voltage fault judgment unit;
the rotor detection module is used for detecting whether the rotor of the rotary transformer has faults or not; a rotor detection module, comprising: an angular velocity sampling unit and a rotor failure judging unit.
The invention at least comprises the following beneficial effects:
the invention realizes the detection of the stator coil of the rotary transformer and the rotor of the rotary transformer, and compared with the traditional detection method, the invention carries out more comprehensive detection, expands the detection range and shortens the detection time.
The invention detects the coil, exciting voltage, feedback voltage and rotor structure respectively, and compared with the traditional detection, the invention can rapidly distinguish the fault cause of the system, thereby greatly improving the efficiency and increasing the detection practicability.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and should not be construed as limiting the invention in any way, in which:
FIG. 1 is a schematic diagram of a circuit for detecting applied voltage of a coil according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a system according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The embodiment of the invention provides a fault detection method of a rotary transformer system, which comprises the following steps:
a resolver coil fault detection process, a resolver rotor fault detection process;
wherein, the liquid crystal display device comprises a liquid crystal display device,
the resolver coil fault detection process includes:
one end of the coil is connected with an external voltage dividing circuit, external voltage is applied to two ends of the coil and the external voltage dividing circuit, and whether the coil has a disconnection fault is judged through the relation between the voltage between the coil and the external voltage dividing circuit and the external voltage; calculating the impedance of the coil through the voltage between the coil and the external voltage dividing circuit and the external voltage to judge whether the coil has an impedance abnormal fault or not;
calculating the distortion rate of the sine feedback voltage waveform and the distortion rate of the cosine feedback voltage waveform by using a sampling method, and judging whether the rotary transformer has feedback faults or not according to the relation between the distortion rate and a preset threshold value;
the resolver rotor fault detection process includes:
and judging whether the rotor of the rotary transformer has jump faults or not by using a fixed sampling frequency sampling method through the angle variation quantity of two adjacent sampling.
Optionally, the specific method for detecting the existence of the disconnection fault of the exciting coil, the sine coil and the cosine coil by using an externally applied voltage signal is as follows: and a resistor is connected in series on the coil, the positive electrode of the series resistor is connected with an external voltage positive electrode, the negative electrode of the coil is connected with an external voltage negative electrode, the voltage between the coil and the series resistor is detected to be a test voltage, and if the value of the obtained test voltage is equal to the value of the voltage positive electrode, the coil has a broken line fault.
As shown in FIG. 1, the specific method for detecting the abnormal impedance faults of the exciting coil, the sine coil and the cosine coil by using an externally applied voltage signal is as follows: the coil is connected with a resistor in series, the anode of the resistor is connected with an external voltage anode, the cathode of the coil is connected with an external voltage cathode, the voltage between the coil and the resistor in series is detected to be a test voltage, and the impedance of the coil is as follows:
wherein "V CC "is the voltage of the external voltage source," V DC The R is the resistance value of the series resistor; if the obtained coil impedance value is brought to satisfyThere is an impedance abnormality in the coil of the resolver.
If it is detected that the impedance of the sine coil and the cosine coil is smaller than the impedance of the excitation coil, the coil of the resolver has an impedance abnormality.
The specific steps for detecting whether the feedback of the rotary transformer is normal or not by calculating the distortion rate of the sine feedback voltage waveform and the distortion rate of the cosine feedback voltage waveform by using a sampling method are as follows:
applying an excitation signal to the excitation coil and rotating the rotary transformer at a constant speed;
collecting peak-to-peak values of a plurality of sine feedback voltages and peak-to-peak values of a plurality of cosine feedback voltages respectively, and carrying out calculation on the effective values of the plurality of feedback voltages to obtain the distortion rate of the sine feedback voltages and the cosine feedback voltages as follows:
wherein U is 1 To U (U) n The effective values of the feedback voltages from the 1 st time to the nth time are respectively;
if the distortion rate of the obtained sine feedback voltage waveform or the distortion rate of the cosine feedback voltage waveform is more than 5%, the rotary transformer has faults.
The specific method for detecting whether the rotor of the rotary transformer has faults or not by using the fixed sampling frequency sampling method is as follows: applying an excitation signal to the excitation coil and rotating the resolver at a constant speed, the speed beingWherein "U" is R "is the excitation signal voltage," U "is the amplitude of the excitation signal," t "is time, if the angle of increase of the sub-sampling compared with the last sampling is smaller than +.>Reverse jump occurs if the next sample is increased by an angle greater than the last sampleDouble angle jumps occur twice as many.
As shown in fig. 2, the present invention also provides a fault detection system of a resolver system, including: the device comprises a coil fault detection module, a coil feedback fault detection module and a rotor detection module;
the coil fault detection module is used for detecting whether the exciting coil, the sine coil and the cosine coil have a broken line fault and an impedance abnormal fault; comprising the following steps: a coil external voltage detection unit, a coil short circuit fault judgment unit and a coil impedance fault judgment unit;
the coil feedback fault detection module is used for detecting whether the feedback of the rotary transformer is normal or not; comprising the following steps: a feedback voltage distortion rate calculation unit and a feedback voltage fault judgment unit;
the rotor detection module is used for detecting whether the rotor of the rotary transformer has faults or not; comprising the following steps: an angular velocity sampling unit and a rotor failure judging unit.
Although embodiments of the present invention have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the invention, and such modifications and variations are within the scope of the invention as defined by the appended claims.

Claims (10)

1. A method of detecting a fault in a resolver system, comprising:
a resolver coil fault detection process, a resolver rotor fault detection process;
wherein, the liquid crystal display device comprises a liquid crystal display device,
the resolver coil fault detection process includes:
one end of the coil is connected with an external voltage dividing circuit, external voltage is applied to two ends of the coil and the external voltage dividing circuit, and whether the coil has a disconnection fault is judged through the relation between the voltage between the coil and the external voltage dividing circuit and the external voltage; calculating the impedance of the coil through the voltage between the coil and the external voltage dividing circuit and the external voltage to judge whether the coil has an impedance abnormal fault or not;
calculating the distortion rate of the sine feedback voltage waveform and the distortion rate of the cosine feedback voltage waveform by using a sampling method, and judging whether the rotary transformer has feedback faults or not according to the relation between the distortion rate and a preset threshold value;
the resolver rotor fault detection process includes:
and judging whether the rotor of the rotary transformer has jump faults or not by using a fixed sampling frequency sampling method through the angle variation quantity of two adjacent sampling.
2. The method of fault detection for a resolver system according to claim 1, wherein the coil includes: excitation coil, sine coil, cosine coil.
3. The fault detection method of a resolver system according to claim 1 or 2, wherein the specific method for determining whether the coil has a broken line fault is as follows:
the coil is connected in series with a resistor serving as an external voltage dividing circuit, the positive electrode of the resistor is connected with the positive electrode of an external voltage, the negative electrode of the coil is connected with the negative electrode of the external voltage, the voltage between the coil and the resistor is obtained to be a test voltage, and when the voltage value of the test voltage is equal to that of the external voltage, the coil has a broken line fault.
4. The method for detecting a fault in a resolver system according to claim 2, wherein the specific method for determining whether the coil has an abnormal impedance fault is as follows:
the coil is connected in series with a resistor serving as an external voltage dividing circuit, the positive electrode of the resistor is connected with the positive electrode of external voltage, the negative electrode of the coil is connected with the negative electrode of the external voltage, the voltage between the coil and the resistor is obtained as test voltage, and the impedance of the coil is calculated through the following formula:
in the formula, "V CC "voltage value of external voltage," V DC "is the voltage value of the test voltage," R "is the resistance value of the resistor;
when (when)When the coil is in the abnormal impedance fault.
5. The fault detection method of a resolver system as claimed in claim 2 or 4, wherein when the impedance of the sine coil and the impedance of the cosine coil are both smaller than the impedance of the excitation coil, an impedance abnormality fault exists in the coils.
6. The fault detection method of a resolver system according to claim 2, wherein the steps of calculating the distortion rate of the sine feedback voltage waveform and the distortion rate of the cosine feedback voltage waveform by the sampling method are as follows:
step A1: applying an excitation signal to the excitation coil and rotating the rotary transformer at a constant speed;
step A2: respectively collecting peak-to-peak values of a plurality of sine feedback voltages and peak-to-peak values of a plurality of cosine feedback voltages, and calculating the distortion rate of the feedback voltages through the following formula:
wherein U is 1 Peak-to-peak value of the 1 st feedback voltage; to U (U) i Is the peak-to-peak value of the ith feedback voltage.
7. The method for detecting a fault in a resolver system according to claim 1 or 2, wherein the specific method for judging whether the resolver has a feedback fault by a relation between the distortion ratio and a preset threshold value is as follows:
when the distortion rate of the sine feedback voltage or the distortion rate of the cosine feedback voltage is more than 5%, the rotary transformer has feedback faults.
8. The method for detecting a fault in a resolver system according to claim 1 or 2, wherein the specific method for judging whether a jump fault exists in a rotor of the resolver is as follows:
applying an excitation signal to the excitation coil and rotating the resolver at a constant speed, wherein the constant speed is:
in the formula, "U R The voltage value of the excitation signal is "U", the amplitude of the excitation signal is "U", and the time is "t";
sampling sine feedback voltage and cosine feedback voltage, obtaining angles, calculating angular speed by using the increment angle of the current sampling angle compared with the previous sampling angle,
when the angular speed is smaller than the constant speed, the reverse jump fault is generated;
and when the angular speed is more than or equal to twice of the fixed speed, the fault is a double angle jump fault.
9. A fault detection system adapted for use in the fault detection method of a resolver system according to any one of claims 1 to 8, characterized in that the fault detection system comprises: the device comprises a coil fault detection module, a coil feedback fault detection module and a rotor detection module;
the coil fault detection module is used for detecting whether the exciting coil, the sine coil and the cosine coil have a broken line fault and an impedance abnormal fault;
the coil feedback fault detection module is used for detecting whether the feedback of the rotary transformer is normal or not;
and the rotor detection module is used for detecting whether the rotor of the rotary transformer has faults or not.
10. The fault detection system of a resolver system of claim 9, wherein the coil fault detection module includes: a coil external voltage detection unit, a coil short circuit fault judgment unit and a coil impedance fault judgment unit; a coil feedback fault detection module comprising: a feedback voltage distortion rate calculation unit and a feedback voltage fault judgment unit; a rotor detection module, comprising: an angular velocity sampling unit and a rotor failure judging unit.
CN202310470862.XA 2023-04-27 2023-04-27 Fault detection method and system for rotary transformer system Pending CN116626535A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310470862.XA CN116626535A (en) 2023-04-27 2023-04-27 Fault detection method and system for rotary transformer system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202310470862.XA CN116626535A (en) 2023-04-27 2023-04-27 Fault detection method and system for rotary transformer system

Publications (1)

Publication Number Publication Date
CN116626535A true CN116626535A (en) 2023-08-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN202310470862.XA Pending CN116626535A (en) 2023-04-27 2023-04-27 Fault detection method and system for rotary transformer system

Country Status (1)

Country Link
CN (1) CN116626535A (en)

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