CN107202957B - Interference identification method, interference identification system and motor - Google Patents
Interference identification method, interference identification system and motor Download PDFInfo
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- CN107202957B CN107202957B CN201710414266.4A CN201710414266A CN107202957B CN 107202957 B CN107202957 B CN 107202957B CN 201710414266 A CN201710414266 A CN 201710414266A CN 107202957 B CN107202957 B CN 107202957B
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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
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/02—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
Abstract
The invention provides an interference identification method, an interference identification system and a motor, wherein the interference identification method is used for the motor and comprises the following steps: determining the rotation speed change rate of the motor; determining a corresponding running state according to the rotating speed change rate; detecting the number of feedback signals in the running state during the running process of the motor; if the number of the feedback signals is larger than the number threshold corresponding to the running state, the motor has interference, otherwise, the motor does not have interference. According to the technical scheme, the identification of high-frequency interference on the direct current motor is realized, a basis is provided for further resisting interference of the direct current motor, the possibility of wrong shutdown of the air conditioner caused by wrong signals acquired by the master control is reduced, and the system stability is improved.
Description
Technical Field
The invention relates to the field of motors, in particular to an interference identification method, an interference identification system and a motor.
Background
At present, in a variable frequency air conditioner control system, the actual rotating speed of a motor is usually calculated by detecting the pulse number of a motor feedback signal, under certain specific conditions, a controller of a variable frequency compressor and a circuit thereof can generate strong interference on the direct current motor feedback signal, and a master control cannot know the existence of the interference, so that the master control acquires an incorrect rotating speed signal, and the air conditioner is stopped incorrectly.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, it is an object of the present invention to provide a method for interference identification.
It is another object of the present invention to provide a disturbance detection system for an electric machine.
It is a further object of this invention to provide such a computer apparatus.
It is yet another object of the present invention to provide a computer-readable storage medium.
It is a further object of the present invention to provide an electric machine.
In order to achieve the above object, an aspect of the first aspect of the present invention provides an interference recognition system for a motor, including: determining the rotation speed change rate of the motor; determining a corresponding running state according to the rotating speed change rate; detecting the number of feedback signals in the running state during the running process of the motor; if the number is larger than the number threshold corresponding to the running state, the motor has interference, otherwise, the motor does not have interference.
In the technical scheme, a premise is provided for further determining the running state of the motor by detecting the rotating speed change rate of the motor, the current running state of the motor is determined according to the rotating speed change rate, in the running process of the motor, whether the motor has interference or not can be accurately identified by detecting the number of feedback signals in the running state and comparing the feedback signals with the number threshold corresponding to the running state, if the number is greater than the number threshold corresponding to the running state, the motor has interference, and if the number is less than or equal to the number threshold corresponding to the running state, the motor is identified without interference, the identification of high-frequency interference on the direct current motor is realized, a basis is provided for further resisting the interference of the direct current motor, the possibility that the air conditioner is shut down mistakenly due to the fact that an error signal is collected by a master control is reduced.
In the above technical solution, preferably, determining the corresponding operating state according to the rotation speed change rate specifically includes: if the rotating speed change rate is positive, the running state is an acceleration state; if the rotating speed change rate is negative, the running state is a deceleration state; and if the rotating speed change rate is zero, the running state is a constant speed state.
In the technical scheme, the corresponding running state can be determined through the rotating speed change rate, if the rotating speed change rate is positive, the running state is an acceleration state, and correspondingly, the quantity threshold corresponding to the running state is the quantity threshold in the acceleration state; if the rotating speed change rate is negative, the running state is negative, and correspondingly, the quantity threshold corresponding to the running state is the quantity threshold in the deceleration state; if the rotating speed change rate is zero, the running state is negative; the determination of the running state of the direct current motor provides a basis for further identifying whether the direct current motor is subjected to high-frequency interference.
In the above technical solution, preferably, the number threshold corresponding to the running state specifically includes: if the running state is an acceleration state, the threshold value of the number of acceleration cycles is the maximum value of the number of feedback signals, wherein the maximum value of the number of feedback signals is the value of the number of feedback signals which are increased most per second in the process that the rotating speed of the motor is increased from zero to the maximum rotating speed; and if the running state is a deceleration state, the threshold value of the number of deceleration cycles is the maximum value of the number of feedback signals, wherein the maximum value of the number of feedback signals is the value of the number of feedback signals which are reduced most per second when the rotating speed of the motor is reduced from the maximum rotating speed to zero.
In the technical scheme, the rotating speed of the direct current motor is in a direct proportion relation with the number of feedback signals, when the motor is in an acceleration state, the number of the feedback signals is increased, the maximum value of the number of the feedback signals is the value of the number of the feedback signals which are increased most per second in the process that the rotating speed of the motor is increased from zero to the maximum rotating speed, and if the current running state of the motor is detected to be in the acceleration state, the corresponding number threshold value is the maximum value of the number of the feedback signals in an acceleration period; when the motor is in a deceleration state, the number of feedback signals is reduced, the maximum value of the number of the feedback signals is the value of the number of the feedback signals which are reduced most per second in the process that the rotating speed of the motor is reduced from the maximum rotating speed to zero, if the current operation state of the motor is detected to be in the deceleration state, the corresponding number threshold value is the maximum value of the number of the feedback signals in the deceleration period, and a comparison parameter can be provided for identifying whether the direct current motor is subjected to high-frequency interference or not by determining the number threshold value corresponding to the operation state of the motor.
In the foregoing technical solution, preferably, the interference identification method further includes: if the running state is the constant speed state, the number of the feedback signals is not more than the number threshold of the acceleration state, and the number of the feedback signals is not more than the number threshold of the deceleration state, the motor has no interference.
In the technical scheme, when the running state of the motor is a constant speed state, the number of the feedback signals is identified, and when the number of the feedback signals is less than or equal to the number threshold of the acceleration periods and the number of the feedback signals is less than or equal to the number threshold of the deceleration periods, the motor is identified to be free of interference; and if the detected number of the feedback signals is greater than the number threshold value in the acceleration state or the number of the feedback signals is greater than the number threshold value in the deceleration state, recognizing that the motor has interference, realizing accurate recognition of whether the direct current motor is interfered in the uniform speed state, and providing a basis for further processing.
The technical scheme of the second aspect of the invention provides an interference identification system, which is used for a motor and comprises the following components: a change rate determining unit for determining a rate of change of a rotation speed of the motor; the state determining unit is used for determining a corresponding running state according to the rotating speed change rate; the signal quantity detection unit is used for detecting the quantity of feedback signals in the running state in the running process of the motor; and the interference identification unit is used for identifying that the motor has interference when the number is larger than the number threshold corresponding to the running state, otherwise, identifying that the motor does not have interference.
In the technical scheme, the change rate of the rotating speed of the motor can be determined through the change rate determining unit, so that a basis is provided for further determining the running state of the motor; the running state of the motor can be determined through the state determining unit, and the premise that the number threshold corresponding to the running state is determined is provided; the number of feedback signals of the motor in the running state can be detected through the signal number detection unit; through the interference identification unit, the data measured by the signal quantity detection unit is compared with the quantity threshold corresponding to the running state, so that whether the motor is subjected to high-frequency interference is accurately identified, and a basis is provided for further processing.
In the foregoing technical solution, preferably, the state determination unit is specifically configured to: if the rotating speed change rate is positive, the running state is an acceleration state; if the rotating speed change rate is negative, the running state is a deceleration state; and if the rotating speed change rate is zero, the running state is a constant speed state.
In the technical scheme, the rotating speed change rate corresponding to the running state of acceleration is positive, the rotating speed change rate corresponding to the running state of deceleration is negative, and the rotating speed change rate corresponding to the running state of uniform speed is zero.
In the above technical solution, preferably, the number threshold corresponding to the running state specifically includes: if the running state is an acceleration state, the threshold value of the number of acceleration cycles is the maximum value of the number of feedback signals, wherein the maximum value of the number of feedback signals is the value of the number of feedback signals which are increased most per second in the process that the rotating speed of the motor is increased from zero to the maximum rotating speed; and if the running state is a deceleration state, the threshold value of the number of deceleration cycles is the maximum value of the number of feedback signals, wherein the maximum value of the number of feedback signals is the value of the number of feedback signals which are reduced most per second when the rotating speed of the motor is reduced from the maximum rotating speed to zero.
In the technical scheme, the rotating speed of the direct current motor is in a direct proportion relation with the number of feedback signals, when the motor is in an acceleration state, the number of the feedback signals is increased, the maximum value of the number of the feedback signals is the value of the number of the feedback signals which are increased most per second in the process that the rotating speed of the motor is increased from zero to the maximum rotating speed, and if the current running state of the motor is detected to be in the acceleration state, the corresponding number threshold value is the maximum value of the number of the feedback signals in an acceleration period; when the motor is in a deceleration state, the number of feedback signals is reduced, the maximum value of the number of the feedback signals is the value of the number of the feedback signals which are reduced most per second in the process that the rotating speed of the motor is reduced from the maximum rotating speed to zero, if the current operation state of the motor is detected to be in the deceleration state, the corresponding number threshold value is the maximum value of the number of the feedback signals in the deceleration period, and a comparison parameter can be provided for identifying whether the direct current motor is subjected to high-frequency interference or not by determining the number threshold value corresponding to the operation state of the motor.
In the above technical solution, preferably, the interference identification system further includes: and the constant speed identification unit is used for identifying that the motor has no interference when the running state is a constant speed period, the number of the feedback signals is not more than the number threshold of the acceleration periods, and the number of the feedback signals is not more than the number threshold of the deceleration periods.
In the technical scheme, when the running state of the motor is a constant speed state, whether the motor has interference can be accurately identified through the constant speed identification unit, and when the number of the feedback signals is less than or equal to the number threshold of the acceleration periods and the number of the feedback signals is less than or equal to the number threshold of the deceleration periods, the constant speed unit identifies that the motor does not have interference; when the number of the feedback signals is larger than the number threshold of the acceleration cycles or the number of the feedback signals is larger than the number threshold of the deceleration cycles, the constant speed identification unit identifies that the motor has interference.
An aspect of the third aspect of the present invention provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. The processor executes a computer program to perform any of the above interference identification methods.
In the technical scheme, a computer program for executing the interference identification method is stored in a memory, and when the processor executes the computer program, whether the motor is interfered can be accurately identified, so that a premise is provided for further processing.
An aspect of the fourth aspect of the present invention provides a computer-readable medium, on which a computer program is stored, which, when executed by a processor, implements the interference identification method as described above.
In this solution, the processor needs to implement the interference identification method as described above by using a computer program, and such a computer program needs to be stored in a computer readable medium. Such a computer-readable medium ensures that the computer program can be executed by the processor in order to accurately identify whether the motor is disturbed.
According to a fifth aspect of the invention, there is provided an electrical machine comprising any one of the above interference identification systems.
In the technical scheme, the motor comprising any one of the interference identification systems can acquire the existence of interference when a feedback signal of the direct current motor is subjected to strong interference, so that the possibility of mistaken shutdown of the air conditioner caused by the fact that the main control acquires wrong rotating speed signals is reduced, and the stability of the system is improved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a flow diagram of an interference identification method according to an embodiment of the invention.
Fig. 2 shows a flow diagram of an interference identification method according to a further embodiment of the invention.
Fig. 3 shows a schematic view of a disturbance identification system according to an embodiment of the invention.
Fig. 4 shows a schematic view of an interference identification system according to a further embodiment of the invention.
FIG. 5 shows a schematic diagram of a computer device according to an embodiment of the invention.
Fig. 6 shows a schematic view of an electrical machine according to an embodiment of the invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
An interference identification method according to an embodiment of the present invention is described below with reference to fig. 1.
Fig. 1 shows a flow diagram of an interference identification method according to an embodiment of the invention.
As shown in fig. 1, the interference recognition method for a motor includes:
step 102, determining the rotation speed change rate of a motor;
104, determining a corresponding running state according to the rotating speed change rate;
106, detecting the number of feedback signals in the running state in the running process of the motor;
and step 108, if the number is larger than the number threshold corresponding to the running state, the motor has interference, otherwise, the motor does not have interference.
In the embodiment, a precondition is provided for further determining the running state of the motor by detecting the rotating speed change rate of the motor, the current running state of the motor is determined according to the rotating speed change rate, in the running process of the motor, whether the motor has interference or not can be accurately identified by detecting the number of feedback signals in the running state and comparing the feedback signals with a number threshold corresponding to the running state, if the number is larger than the number threshold corresponding to the running state, the motor has interference, and if the number is smaller than or equal to the number threshold corresponding to the running state, the motor is identified without interference, so that the identification of high-frequency interference on the direct current motor is realized, a basis is provided for further resisting the interference of the direct current motor, the possibility that the air conditioner is shut down mistakenly due to the fact that an error signal is collected by a master controller.
Fig. 2 shows a flow diagram of an interference identification method according to an embodiment of the invention.
As shown in fig. 2, the interference recognition method for a motor includes:
step 202, determining the rotation speed change rate of the motor;
step 2042, if the rotation speed change rate is positive, the running state is an acceleration state;
step 2044, if the rate of change of the rotational speed is negative, the operating state is a deceleration state;
step 2046, if the rate of change of the rotation speed is zero, the running state is a constant speed state;
step 206, detecting the number of feedback signals in the running state in the running process of the motor;
step 2082, if the running state is an acceleration state, the number threshold of the acceleration cycles is the maximum value of the number of the feedback signals, if the number of the current feedback signals is greater than the number threshold, the motor has interference, otherwise, the motor does not have interference.
Step 2084, if the running state is the deceleration state, the number threshold of the deceleration cycles is the maximum value of the number of the feedback signals, if the current feedback number signal is greater than the number threshold, the motor has interference, otherwise, the motor does not have interference.
Step 2086, if the operation state is the constant speed state, the number of the feedback signals is not greater than the number threshold of the acceleration states, and the number of the feedback signals is not greater than the number threshold of the deceleration states, then the motor has no interference.
In this embodiment, a precondition is provided for further determining the operating state of the motor by detecting the rate of change of the rotational speed of the motor, the current operating state of the motor is determined according to the rate of change of the rotational speed, if the rate of change of the rotational speed is positive, the current operating state is an acceleration state, during the operation of the motor, the number of feedback signals in the operating state is detected, if the number of current feedback signals is greater than a number threshold, the motor is interfered, otherwise, no interference exists. Wherein the number threshold is the maximum value of the number of feedback signals, i.e. the value of the number of feedback signals that the motor increases the most per second during the process of increasing from zero to the maximum rotational speed.
Similarly, if the rotating speed change rate is negative, the motor is proved to be in a deceleration state, the number of feedback signals in the running state is detected in the running process of the motor, if the number of the current feedback signals is larger than the number threshold, the motor is interfered, and otherwise, the motor is not interfered. Wherein the number threshold is a maximum value of the number of feedback signals, i.e. a value of the number of feedback signals that the motor decreases the most per second in the process of decreasing the rotation speed from the maximum rotation speed to zero.
Similarly, if the change rate of the rotating speed is zero, the motor is proved to be in a constant speed state, the number of feedback signals in the running state is detected in the running process of the motor, and if the number of the current feedback signals is not more than the number threshold of the acceleration state and the number of the current feedback signals is not more than the number threshold of the deceleration state, the motor has no interference.
Fig. 3 shows a schematic view of a disturbance identification system according to an embodiment of the invention.
As shown in fig. 3, the interference recognition system 100, for use with a motor, includes:
a change rate determining unit 102 for determining a rate of change of the rotational speed of the motor;
a state determination unit 104, configured to determine a corresponding operation state according to the rotation speed change rate;
a signal number detection unit 106 for detecting the number of feedback signals in an operation state during the operation of the motor;
and the interference judging unit 108 is configured to judge that the motor has interference when the number is greater than the number threshold corresponding to the operating state, and otherwise, judge that the motor does not have interference.
In this embodiment, the change rate determining unit 102 can determine the change rate of the rotation speed of the motor, so as to provide a basis for further determining the running state of the motor; the state determination unit 104 can determine the operation state of the motor, which is a precondition for determining the number threshold corresponding to the operation state; the number of feedback signals of the motor in the running state can be detected by the signal number detection unit 106; by comparing the data detected by the signal quantity detection unit with the quantity threshold corresponding to the running state through the interference identification unit 108, the accurate identification of whether the motor is subjected to high-frequency interference is realized, and a basis is provided for further processing.
Fig. 4 shows a schematic view of an interference identification system according to a further embodiment of the invention.
As shown in fig. 4, the interference recognition system 200, for a motor, includes:
a rate-of-change determination unit 202 for determining a rate of change of the rotational speed of the motor;
a state determining unit 204, configured to determine a corresponding operating state according to the rotation speed change rate;
a signal number detection unit 206 for detecting the number of feedback signals in an operation state during the operation of the motor;
the interference judging unit 208 is configured to judge that the motor has interference when the number is greater than a number threshold corresponding to the operating state, and otherwise, judge that the motor does not have interference;
the constant speed identification unit 210 is configured to identify that no interference exists in the motor when the operation state is a constant speed period, the number of the feedback signals is not greater than the number threshold of the acceleration periods, and the number of the feedback signals is not greater than the number threshold of the deceleration periods.
In this embodiment, when the running state of the motor is the constant speed state, the constant speed identification unit 210 may accurately identify whether the motor has interference, and when the number of the feedback signals is less than or equal to the number threshold of the acceleration cycles and the number of the feedback signals is less than or equal to the number threshold of the deceleration cycles, the constant speed unit identifies that the motor has no interference; when the number of the feedback signals is larger than the number threshold of the acceleration cycles or the number of the feedback signals is larger than the number threshold of the deceleration cycles, the constant speed identification unit identifies that the motor has interference.
FIG. 5 shows a schematic diagram of a computer device according to an embodiment of the invention.
As shown in fig. 5, the computer apparatus 1 includes:
a memory 12, the memory 12 for storing a computer program;
a processor 14, the processor 14 being for executing a computer program stored in the memory;
the processor 14, when executing the computer program, performs the steps of:
determining the rotation speed change rate of the motor; determining a corresponding running state according to the rotating speed change rate; detecting the number of feedback signals in the running state during the running process of the motor; if the number is larger than the number threshold corresponding to the running state, the motor has interference, otherwise, the motor does not have interference.
In this embodiment, a computer program for executing the interference recognition method is stored in the memory, and when the processor executes the computer program, whether the motor is interfered can be accurately recognized, so as to provide a precondition for further processing.
Fig. 6 shows a schematic view of an electrical machine according to an embodiment of the invention.
As shown in fig. 6, the motor 600 includes:
and the interference identification system 602 is configured to identify whether the dc motor feedback signal is interfered.
In the embodiment, the motor comprising any one of the interference identification systems can know the existence of interference when a feedback signal of the direct current motor is subjected to strong interference, so that the possibility of mistaken shutdown of the air conditioner caused by the fact that the main control acquires wrong rotating speed signals is reduced, and the stability of the system is improved.
The technical scheme of the invention is explained in detail by combining the attached drawings, the identification of high-frequency interference on the direct current motor is realized, a basis is provided for further anti-interference of the direct current motor, the possibility of wrong shutdown of the air conditioner caused by wrong signals acquired by the main control is reduced, and the system stability is improved.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A disturbance identification method for an electric machine, comprising:
determining the rotation speed change rate of the motor;
determining a corresponding operation state according to the rotating speed change rate;
detecting the number of feedback signals in an operating state during the operation of the motor;
if the number is larger than the number threshold corresponding to the running state, the motor has interference, otherwise, the motor does not have interference;
if the rotating speed change rate is positive, the running state is an acceleration state, and the number threshold of the acceleration periods is the maximum value of the number of the feedback signals, wherein the maximum value of the number of the feedback signals is the value of the number of the feedback signals which is increased most per second in the process that the rotating speed of the motor is increased from zero to the maximum rotating speed;
and if the rotating speed change rate is negative, the running state is a deceleration state, and the number threshold of the deceleration cycles is the maximum value of the number of the feedback signals, wherein the maximum value of the number of the feedback signals is the value of the number of the feedback signals which is reduced most per second in the process that the rotating speed of the motor is reduced from the maximum rotating speed to zero.
2. The disturbance identification method according to claim 1, wherein the determining a corresponding operating state according to the rotation speed change rate specifically includes:
and if the rotating speed change rate is zero, the running state is a constant speed state.
3. The interference identification method according to claim 2, further comprising:
if the running state is a constant speed state, the number is not greater than the number threshold of the acceleration states, and the number is not greater than the number threshold of the deceleration states, the motor does not have interference.
4. A disturbance identification system for an electric machine, comprising:
a change rate determining unit for determining a rate of change of a rotation speed of the motor;
the state determining unit is used for determining a corresponding running state according to the rotating speed change rate;
the signal quantity detection unit is used for detecting the quantity of feedback signals in the running state in the running process of the motor;
the interference identification unit is used for identifying that the motor has interference when the number is larger than a number threshold corresponding to the running state, otherwise, identifying that the motor does not have interference;
if the rotating speed change rate is positive, the running state is an acceleration state, and the number threshold of the acceleration periods is the maximum value of the number of the feedback signals, wherein the maximum value of the number of the feedback signals is the value of the number of the feedback signals which is increased most per second in the process that the rotating speed of the motor is increased from zero to the maximum rotating speed;
and if the rotating speed change rate is negative, the running state is a deceleration state, and the number threshold of the deceleration cycles is the maximum value of the number of the feedback signals, wherein the maximum value of the number of the feedback signals is the value of the number of the feedback signals which is reduced most per second in the process that the rotating speed of the motor is reduced from the maximum rotating speed to zero.
5. The interference identification system according to claim 4, wherein the state determination unit is specifically configured to:
and if the rotating speed change rate is zero, the running state is a constant speed state.
6. The interference identification system of claim 5, further comprising:
and the constant speed identification unit is used for identifying that the motor has no interference when the running state is a constant speed period, the number is not greater than the number threshold of the acceleration periods, and the number is not greater than the number threshold of the deceleration periods.
7. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor executes the computer program to perform the interference recognition method according to any one of claims 1 to 3.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the interference identification method according to any one of claims 1 to 3.
9. An electric machine, comprising: the interference identification system of any one of claims 4 to 6.
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| US8922155B2 (en) * | 2012-12-10 | 2014-12-30 | Lennox Industries Inc. | Monitoring motor condition |
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