Three-phase motor fault detection method based on signal difference at same time

By collecting and comparing the working current and temperature signals of three-phase motors and calculating the signal difference characteristic values, the accurate detection of three-phase motor failures is achieved, and the problem of inaccurate fault detection in the existing technology is solved, and the reliability of the motor is improved.

CN119758073APending Publication Date: 2025-04-04YANCHENG POWER SUPPLY CO STATE GRID JIANGSU ELECTRIC POWER CO +3
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Patent Information

Application Number
CN202411953093.X
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-27
Publication Date
2025-04-04

AI Technical Summary

Technical Problem

The prior art is difficult to effectively monitor and detect the failure of three-phase motors, affecting power grid safety and user needs.

Method used

By collecting the working current and working temperature signals of each phase of the three-phase motor, comparing it with the reference value, calculating the difference characteristic values ​​of the working current signals of each phase at the same time, and judging the abnormal situation of the three-phase motor.

Benefits of technology

Improve the accuracy of three-phase motor fault detection, promptly detect abnormalities, and ensure the reliability of the motor.

✦ Generated by Eureka AI based on patent content.

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Abstract

The invention provides a three-phase motor fault detection method based on signal difference at the same time. The method comprises the following steps: (1) collecting information; (2) judging whether abnormity exists or not according to the working temperature, and if yes, giving an alarm; if not, entering (3); (3) judging whether abnormity exists or not according to the working current of each phase, and if yes, giving an alarm; if not, entering (4); (4) calculating the difference characteristic value of each phase of working current at the same moment; (5) judging whether abnormity exists or not according to the difference characteristic value of the working current of each phase at the same moment, and if yes, giving an alarm; if not, entering (6); (6) calculating the average value of the difference characteristic values of the working current of each phase at the same moment; (7) judging whether abnormity exists or not according to the average value of the difference characteristic values of the working currents of all phases at the same moment, and if yes, giving an alarm. The invention provides a three-phase motor fault detection method based on signal difference at the same time, which can accurately judge whether the three-phase motor is abnormal or not, and further ensure the working reliability.
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Description

Technical Field

[0001] The present invention belongs to the technical field of power detection, and in particular relates to a three-phase motor fault detection method based on signal differences at the same time. Background Art

[0002] Three-phase motors are widely used to meet people's various production and life needs. Due to the harsh external working environment and long use time, three-phase motors may fail, which in turn affects the safety of the power grid or the production and life needs of users. In order to ensure the safe and reliable operation of three-phase motors, it is necessary to effectively monitor their faults and handle them in time.

[0003] The present invention proposes a three-phase motor fault detection method based on signal differences at the same time, which collects the working current and working temperature signals of each phase of the three-phase motor and compares them with reference values ​​to promptly discover obvious abnormalities; then calculates the differences in the three-phase working currents and the characteristic values ​​of the working current signal differences of each phase at the same time, further judges the condition of the three-phase motor, and improves the accuracy of fault detection. Summary of the invention

[0004] The present invention provides a three-phase motor fault detection method based on signal differences at the same time, which can accurately determine whether the three-phase motor has an abnormality, thereby ensuring the reliability of the work.

[0005] The present invention is specifically a three-phase motor fault detection method based on signal differences at the same time, and the three-phase motor fault detection method comprises the following steps:

[0006] Step (1): collecting the operating current, operating temperature signal and ambient temperature of each phase of the three-phase motor;

[0007] Step (2): judging whether the three-phase motor is abnormal according to the operating temperature, and if so, issuing an alarm; if not, proceeding to step (3);

[0008] Step (3): judging whether the three-phase motor has an abnormality according to the working current of each phase, and if so, issuing an alarm; if not, proceeding to step (4);

[0009] Step (4): Calculate the difference characteristic value of the working current signal of each phase at the same time;

[0010] Step (5): judging whether the three-phase motor has an abnormality according to the difference characteristic values ​​of the working current signals of each phase at the same time, and if so, issuing an alarm; if not, proceeding to step (6);

[0011] Step (6): Calculate the average value of the difference characteristic value of the working current signal of each phase at the same time;

[0012] Step (7): Determine whether the three-phase motor has an abnormality based on the average value of the difference characteristic values ​​of the working current signals of each phase at the same time. If so, issue an alarm.

[0013] Furthermore, the operating temperature signal includes a winding temperature signal and a core temperature signal of the three-phase motor.

[0014] Furthermore, in step (2), the specific method for judging whether the three-phase motor is abnormal according to the operating temperature is:

[0015] It is determined whether the operating temperature is greater than an operating temperature reference value. If so, an abnormality exists in the three-phase motor.

[0016] Furthermore, the specific algorithm of the working temperature reference value is:

[0017]

[0018] Where T h is the ambient temperature, T ch is the operating temperature under nominal environment, I is the operating current, I e is the operating current rating.

[0019] Furthermore, in step (3), the specific method for judging whether the three-phase motor has an abnormality according to the working current of each phase is:

[0020] (31) Determine whether the working current of phase A is greater than the working current reference value. If so, the three-phase motor has an abnormality; if not, enter (32);

[0021] (32) Determine whether the working current of phase B is greater than the working current reference value. If so, the three-phase motor has an abnormality; if not, enter (33);

[0022] (33) Determine whether the working current of phase C is greater than the working current reference value. If so, the three-phase motor has an abnormality; if not, proceed to (34);

[0023] (34) Calculate the difference between the working current of phase A and the working current of phase B, and record it as I AB , judge I AB Is it greater than the working current difference reference value? If so, the three-phase motor has an abnormality; if not, enter (35);

[0024] (35) Calculate the difference between the working current of phase B and the working current of phase C, denoted as I BC , judge I BC Is it greater than the working current difference reference value? If so, the three-phase motor has an abnormality; if not, enter (36);

[0025] (36) Calculate the difference between the working current of phase C and the working current of phase A, and record it as I CA , judge I CA Is it greater than the working current difference reference value? If so, there is an abnormality in the three-phase motor.

[0026] Furthermore, in step (4), the specific method for calculating the difference characteristic values ​​of the working current signals of each phase at the same time is:

[0027]

[0028] Among them I i is the working current.

[0029] Furthermore, in step (5), the specific method for judging whether the three-phase motor has an abnormality according to the difference characteristic values ​​of the working current signals of each phase at the same time is:

[0030] Determine whether the working current signal difference characteristic value of each phase at the same time is greater than the current difference characteristic value reference value. If so, the three-phase motor has an abnormality.

[0031] Furthermore, in step (7), the specific method for judging whether the three-phase motor has an abnormality according to the average value of the difference characteristic value of the working current signal of each phase at the same time is:

[0032] Determine whether the average value of the difference characteristic values ​​of the working current signals of each phase at the same time is greater than the reference value of the average value of the current difference characteristic values. If so, there is an abnormality in the three-phase motor.

[0033] Compared with the prior art, the beneficial effects are: the three-phase motor fault detection method collects the working current and working temperature signals of each phase of the three-phase motor, and compares them with the reference values ​​to promptly discover obvious abnormalities; then calculates the difference in the three-phase working current and the characteristic value of the difference in the working current signal of each phase at the same time, further judges the condition of the three-phase motor, and improves the accuracy of fault detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The present invention is a flowchart of a three-phase motor fault detection method based on signal differences at the same time. DETAILED DESCRIPTION

[0035] The following is a detailed description of a specific implementation of a three-phase motor fault detection method based on signal differences at the same time according to the present invention in conjunction with the accompanying drawings.

[0036] like Figure 1 As shown, the three-phase motor fault detection method of the present invention comprises the following steps:

[0037] Step (1): collecting the operating current of each phase of the three-phase motor, the operating temperature signal and the ambient temperature, wherein the operating temperature signal includes the winding temperature signal and the core temperature signal of the three-phase motor;

[0038] Step (2): judging whether the three-phase motor is abnormal according to the operating temperature, specifically:

[0039] Determine whether the operating temperature is greater than the operating temperature reference value. If so, the three-phase motor is abnormal and an alarm is issued; if not, proceed to step (3);

[0040] Step (3): judging whether the three-phase motor has an abnormality according to the working current of each phase, specifically comprising:

[0041] (31) Determine whether the working current of phase A is greater than the working current reference value. If so, the three-phase motor is abnormal and an alarm is issued; if not, enter (32);

[0042] (32) Determine whether the working current of phase B is greater than the working current reference value. If so, the three-phase motor is abnormal and an alarm is issued; if not, enter (33);

[0043] (33) Determine whether the working current of phase C is greater than the working current reference value. If so, the three-phase motor is abnormal and an alarm is issued; if not, enter (34);

[0044] (34) Calculate the difference between the working current of phase A and the working current of phase B, and record it as I AB , judge I AB Is it greater than the working current difference reference value? If so, the three-phase motor has an abnormality and an alarm is issued; if not, enter (35);

[0045] (35) Calculate the difference between the working current of phase B and the working current of phase C, denoted as I BC , judge I BC Is it greater than the working current difference reference value? If so, the three-phase motor has an abnormality and an alarm is issued; if not, enter (36)

[0046] (36) Calculate the difference between the working current of phase C and the working current of phase A, and record it as I CA , judge I CA Is it greater than the working current difference reference value? If so, the three-phase motor has an abnormality and an alarm is issued; if not, go to step (4);

[0047] Step (4): Calculate the difference characteristic value of the working current signal of each phase at the same time

[0048] Among them I i is the working current;

[0049] Step (5): judging whether the three-phase motor has an abnormality according to the difference characteristic values ​​of the working current signals of each phase at the same time: judging whether the difference characteristic values ​​of the working current signals of each phase at the same time are greater than the reference value of the current difference characteristic value; if so, the three-phase motor has an abnormality and an alarm is issued; if not, proceeding to step (6);

[0050] Step (6): Calculate the average value of the difference characteristic value of the working current signal of each phase at the same time;

[0051] Step (7): Determine whether the three-phase motor has an abnormality based on the average value of the difference characteristic values ​​of the working current signals of each phase at the same time: Determine whether the average value of the difference characteristic values ​​of the working current signals of each phase at the same time is greater than the reference value of the average value of the current difference characteristic value. If so, the three-phase motor has an abnormality and an alarm is issued.

[0052] The specific algorithm of the working temperature reference value is:

[0053]

[0054] Where T h is the ambient temperature, T ch is the operating temperature under nominal environment, I is the operating current, I e is the operating current rating.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not intended to limit the present invention. A person skilled in the art should understand that the specific implementation of the present invention can be modified or replaced by equivalents, but these modifications or changes are within the scope of protection of the pending claims.

Claims

1. A three-phase motor fault detection method based on signal differences at the same time, characterized in that: The three-phase motor fault detection method comprises the following steps: Step (1): collecting the operating current, operating temperature signal and ambient temperature of each phase of the three-phase motor; Step (2): judging whether the three-phase motor is abnormal according to the operating temperature, and if so, issuing an alarm; if not, proceeding to step (3); Step (3): judging whether the three-phase motor has an abnormality according to the working current of each phase, and if so, issuing an alarm; if not, proceeding to step (4); Step (4): Calculate the difference characteristic value of the working current signal of each phase at the same time; Step (5): judging whether the three-phase motor has an abnormality according to the difference characteristic values ​​of the working current signals of each phase at the same time, and if so, issuing an alarm; if not, proceeding to step (6); Step (6): Calculate the average value of the difference characteristic value of the working current signal of each phase at the same time; Step (7): Determine whether the three-phase motor has an abnormality based on the average value of the difference characteristic values ​​of the working current signals of each phase at the same time, and if so, issue an alarm.

2. A three-phase motor fault detection method based on signal differences at the same time according to claim 1, characterized in that: The operating temperature signal includes a winding temperature signal and a core temperature signal of the three-phase motor.

3. A three-phase motor fault detection method based on signal differences at the same time according to claim 2, characterized in that: The specific method of judging whether the three-phase motor has an abnormality according to the working temperature in step (2) is: judging whether the working temperature is greater than the working temperature reference value; if so, the three-phase motor has an abnormality.

4. A three-phase motor fault detection method based on signal differences at the same time according to claim 3, characterized in that: The specific algorithm of the working temperature reference value is: Where T h is the ambient temperature, T ch is the operating temperature under nominal environment, I is the operating current, I e is the operating current rating.

5. A three-phase motor fault detection method based on signal differences at the same time according to claim 4, characterized in that: The specific method for judging whether the three-phase motor has an abnormality according to the working current of each phase in step (3) is: (31) Determine whether the working current of phase A is greater than the working current reference value. If so, the three-phase motor has an abnormality; if not, enter (32); (32) determining whether the working current of phase B is greater than a working current reference value; if so, the three-phase motor has an abnormality; If not, go to (33); (33) determining whether the working current of phase C is greater than a working current reference value; if so, the three-phase motor is abnormal; If not, go to (34); (34) Calculate the difference between the working current of phase A and the working current of phase B, and record it as I AB , judge I AB whether it is greater than the working current difference reference value, if so, the three-phase motor has an abnormality; If not, go to (35); (35) Calculate the difference between the working current of phase B and the working current of phase C, denoted as I BC , judge I BC whether it is greater than the working current difference reference value, if so, the three-phase motor has an abnormality; If not, go to (36); (36) Calculate the difference between the working current of phase C and the working current of phase A, and record it as I CA , judge I CA Is it greater than the working current difference reference value? If so, there is an abnormality in the three-phase motor.

6. A three-phase motor fault detection method based on signal differences at the same time according to claim 5, characterized in that: The specific method for calculating the difference characteristic values ​​of the working current signals of each phase at the same time in step (4) is: Among them I i is the working current.

7. A three-phase motor fault detection method based on signal differences at the same time according to claim 6, characterized in that: The specific method for judging whether the three-phase motor has an abnormality according to the difference characteristic values ​​of the working current signals of each phase at the same time in step (5) is as follows: judging whether the difference characteristic values ​​of the working current signals of each phase at the same time are greater than the reference value of the current difference characteristic value; if so, the three-phase motor has an abnormality.

8. A three-phase motor fault detection method based on signal differences at the same time according to claim 7, characterized in that: The specific method for judging whether the three-phase motor has an abnormality according to the average value of the difference characteristic values ​​of the working current signals of each phase at the same time in step (7) is as follows: judging whether the average value of the difference characteristic values ​​of the working current signals of each phase at the same time is greater than the reference value of the average value of the current difference characteristic values; if so, the three-phase motor has an abnormality.