CN112865615B - Motor control method and device, storage medium and motor - Google Patents
Motor control method and device, storage medium and motor Download PDFInfo
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- CN112865615B CN112865615B CN202110061956.2A CN202110061956A CN112865615B CN 112865615 B CN112865615 B CN 112865615B CN 202110061956 A CN202110061956 A CN 202110061956A CN 112865615 B CN112865615 B CN 112865615B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/08—Arrangements for controlling the speed or torque of a single motor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/20—Controlling the acceleration or deceleration
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Abstract
The invention provides a motor control method, a motor control device, a storage medium and a motor, wherein the motor control method comprises the following steps: sampling, namely sampling the running current of the motor and generating a current running curve according to the sampled running current; an acquisition step, which is used for acquiring a corresponding operation rotating speed according to the current operation curve and acquiring a current harmonic component value under the corresponding operation rotating speed; a comparison step, which is used for comparing the obtained current harmonic component value with a target current harmonic component value under a preset corresponding running rotating speed so as to determine whether the running current of the motor is in a harmonic abnormal state or not; and an adjusting step, wherein if the running current of the motor is determined to be in a harmonic abnormal state, preset adjusting operation is performed on the rotating speed of the motor. The scheme provided by the invention can realize the improvement of the whole operation noise point.
Description
Technical Field
The present invention relates to the field of control, and in particular, to a motor control method, a device, a storage medium, and a motor.
Background
The brushless DC motor has the advantages of simple structure, safe and reliable operation, good speed regulation performance and the like, so that the brushless DC motor is widely applied to various industries. Such as air conditioners, air purifiers, washing machines, etc. In addition to the relatively high demands on the performance and cost of the motor itself, there are also high demands on the noise during operation in these applications. Noise of the brushless dc motor is mainly divided into two types: mechanical noise and electromagnetic noise. Mechanical noise is mainly generated by the motor during operation, and the generation is more caused. For example: the motor is not installed in place, the manual operation is performed, the motor equipment is easy to fail after long-time operation, or the internal elements of the motor are deformed to generate friction and the like.
Electromagnetic noise is derived from electromagnetic vibration, and the electromagnetic vibration is excited by electromagnetic waves generated by the action of an air gap field of the motor on a motor iron core. When the frequency and the order of the electromagnetic wave are close to or consistent with the natural frequency corresponding to the stator and the modal order of the electromagnetic wave, the motor will generate a resonance effect, and at the moment, the electromagnetic vibration and the electromagnetic noise of the motor will be particularly obvious. Because the interaction of the stator magnetic field and the rotor magnetic field exists in the motor, the operation of the internal magnetic field is complex, the current harmonic content is higher, the harmonic electromagnetic force of the main noise source of the motor is higher, the noise vibration of the motor is higher, and the electromagnetic noise is caused.
At present, a motor often needs to be matched with multiple air conditioner loads, noise can be generated at different rotating speed points when the same motor runs on different loads, the traditional scheme for improving the noise points generally improves modes on the whole machine or the structure to avoid the noise points, a large amount of change and a large amount of verification work are needed, and the problems of long time and large workload exist.
Disclosure of Invention
The main object of the present invention is to overcome the above drawbacks of the prior art, and to provide a motor control method, a device, a storage medium and a motor, so as to solve the problem that the prior art scheme for improving noise point needs to perform a lot of modification and a lot of verification.
In one aspect, the present invention provides a motor control method, including: sampling, namely sampling the running current of the motor and generating a current running curve according to the sampled running current; an acquisition step, which is used for acquiring a corresponding operation rotating speed according to the current operation curve and acquiring a current harmonic component value under the corresponding operation rotating speed; a comparison step, which is used for comparing the obtained current harmonic component value with a target current harmonic component value under a preset corresponding running rotating speed so as to determine whether the running current of the motor is in a harmonic abnormal state or not; and an adjusting step, wherein if the running current of the motor is determined to be in a harmonic abnormal state, preset adjusting operation is performed on the rotating speed of the motor.
Optionally, performing a preset adjustment operation on the running speed of the motor includes: if the motor is in the acceleration adjustment process, an adjustment instruction is sent to increase the rotating speed adjustment rate of the motor to N times of the original rotating speed adjustment rate; n is more than or equal to 3; if the motor is in the process of speed reduction adjustment, sending an adjustment instruction to increase the speed of rotation of the motor by N times; n is more than or equal to 3.
Optionally, the method further comprises: after the preset adjustment operation is performed on the running rotation speed of the motor in the adjustment step, the acquisition step and the comparison step are executed again; and if the comparison step determines that the running current of the motor is in a harmonic abnormal state, executing the adjustment step again.
Optionally, determining the target current harmonic component value at the corresponding operation rotation speed according to a preset corresponding relation curve of the motor operation rotation speed and the target current harmonic component value.
Another aspect of the present invention provides a motor control apparatus, comprising: the sampling unit is used for sampling the running current of the motor and generating a current running curve according to the sampled running current; the acquisition unit is used for acquiring corresponding operation rotating speeds according to the current operation curves and acquiring current harmonic component values at the corresponding operation rotating speeds; the comparison unit is used for comparing the obtained current harmonic component value with a target current harmonic component value under a preset corresponding running rotating speed so as to determine whether the running current of the motor is in a harmonic abnormal state or not; and the adjusting unit is used for carrying out preset adjusting operation on the rotating speed of the motor if the running current of the motor is determined to be in a harmonic abnormal state.
Optionally, the adjusting unit performs a preset adjusting operation on the running rotation speed of the motor, including: if the motor is in the acceleration adjustment process, an adjustment instruction is sent to increase the rotating speed adjustment rate of the motor to N times of the original rotating speed adjustment rate; n is more than or equal to 3; if the motor is in the process of speed reduction adjustment, sending an adjustment instruction to increase the speed of rotation of the motor by N times; n is more than or equal to 3.
Optionally, the method further comprises: after the preset adjustment operation is carried out on the running rotating speed of the motor by the adjustment unit, the functions of the acquisition unit, the acquisition unit and the comparison unit are executed again; and if the comparison unit determines that the running current of the motor is in a harmonic abnormal state, the execution unit carries out preset adjustment operation on the rotating speed of the motor again.
Optionally, determining the target current harmonic component value at the corresponding operation rotation speed according to a preset corresponding relation curve of the motor operation rotation speed and the target current harmonic component value.
In a further aspect the invention provides a storage medium having stored thereon a computer program which when executed by a processor performs the steps of any of the methods described above.
In a further aspect the invention provides an electric machine comprising a processor, a memory and a computer program stored on the memory and executable on the processor, the processor implementing the steps of any of the methods described hereinbefore when the program is executed.
In a further aspect the invention provides an electric machine comprising a motor control device as described in any one of the preceding.
According to the technical scheme, whether the harmonic component value of the motor running current is abnormal or not is judged by sampling the motor running current in real time and combining the current sampling curve, if so, the rotating speed of the motor is adjusted, a frequency swinging strategy is adopted, and the noise point is prevented from being excited, so that the improvement of the whole running noise point is realized. Motor noise from motor speed regulation control direction improvement motor, through the quick pendulum frequency based on harmonic component size, applicable multiple application conditions possesses autonomous recognition ability, avoids when matching different loads, and the motor noise needs a large amount of rectification to match test work, and application scope is extensive, has realized good control effect, promotes the performance of motor.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation on the invention. In the drawings:
FIG. 1 is a method schematic diagram of an embodiment of a motor control method provided by the present invention;
FIG. 2 shows a schematic diagram of a process for sampling the operating voltage and operating current of the U, V, W phases;
FIG. 3 is a schematic diagram showing whether the harmonic component levels of the rotational speed points are abnormal by comparing the current operation curves with the corresponding relation curves of different operation rotational speeds and target current harmonic component values;
FIG. 4 is a method schematic diagram of a motor control method according to an embodiment of the present invention;
FIG. 5a shows a schematic diagram of a change in rotational speed without an adjustment in rotational speed adjustment rate;
FIG. 5b shows a schematic diagram of a rotational speed variation for adjusting the rotational speed adjustment rate;
fig. 6 is a block diagram of an embodiment of a motor control device according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to specific embodiments of the present invention and corresponding drawings. It will be apparent that the described embodiments are only 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 be within the scope of the invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention provides a motor control method. The method comprises the following steps: sampling, namely sampling the running current of the motor and generating a current running curve according to the sampled running current; an acquisition step, which is used for acquiring a corresponding operation rotating speed according to the current operation curve and acquiring a current harmonic component value under the corresponding operation rotating speed; a comparison step, which is used for comparing the obtained current harmonic component value with a target current harmonic component value under a preset corresponding running rotating speed so as to determine whether the running current of the motor is in a harmonic abnormal state or not; and an adjusting step, wherein if the running current of the motor is determined to be in a harmonic abnormal state, preset adjusting operation is performed on the rotating speed of the motor.
Fig. 1 is a schematic diagram of a motor control method according to an embodiment of the present invention.
As shown in fig. 1, the motor control method at least includes a sampling step S110, an obtaining step S120, a comparing step S130, and an adjusting step S140 according to an embodiment of the present invention.
Step S110, the operation current of the motor is sampled, and a current operation curve is generated according to the operation current obtained by sampling.
Specifically, by sampling the operating voltages and the operating currents of the U-phase, the V-phase and the W-phase of the motor and combining the bus voltage and the bus current under the current working condition of the motor, the real-time operating power P (p=u×i) of the motor can be obtained. And drawing a current running curve of the motor according to the sampling result of the running current. Referring to fig. 2, fig. 2 is a schematic diagram of a process for sampling the operating voltages and operating currents of the U-, V-, and W-phases. As shown in fig. 2, a corresponding operating speed can be obtained from the operating current.
Step S120, obtaining a corresponding operation rotation speed according to the current operation curve, and obtaining a current harmonic component value at the corresponding operation rotation speed.
Specifically, the corresponding operating speed can be obtained according to the current operating curve. The rotation speed n=60 f/p of the synchronous motor, p represents the pole pair number of the motor, f represents the frequency of the stator current, and f is known and can be calculated.
The harmonic component value of the current at a certain rotation speed point (the harmonic component value can represent the level of the noise value) can be calculated and analyzed according to the current operation curve based on the rotation speed point.
And step S130, comparing the obtained current harmonic component value with a target current harmonic component value at a preset corresponding running rotating speed to determine whether the running current of the motor is in a harmonic abnormal state.
In some specific embodiments, a corresponding relation curve of the motor operation speed and a target current harmonic component value is preset and stored, and the target current harmonic component value at the corresponding operation speed is determined according to the preset corresponding relation curve of the motor operation speed and the target current harmonic component value, so that the obtained current harmonic component value is compared with the target current harmonic component value at the preset corresponding operation speed, and whether the operation current of the motor is in a harmonic abnormal state is determined. The target current harmonic component value is specifically a maximum harmonic component value acceptable at the corresponding operating speed beyond which noise becomes unacceptable.
For example, the correspondence curves of different operation speeds and target current harmonic component values are stored in advance in the controller. And comparing the harmonic component value corresponding to the currently acquired rotating speed with the harmonic component value of the target current stored by the controller, and judging whether the harmonic component level of the rotating speed point is abnormal or not. When the obtained current harmonic component value is smaller than a target current harmonic component value under a preset corresponding running rotating speed, judging that the running current of the motor is in a harmonic normal state and is in a normal harmonic running state; when the obtained current harmonic component value is greater than or equal to a target current harmonic component value under a preset corresponding running rotating speed, the running current of the motor can be judged to be in a harmonic abnormal state, a high-frequency noise signal can be excited, and the abnormal harmonic running state is achieved. The above process may refer to fig. 3, and fig. 3 shows a schematic diagram of comparing whether the harmonic component level of the rotation speed point is abnormal or not through a current operation curve and a corresponding relation curve of different operation rotation speeds and a target current harmonic component value.
Optionally, comparing whether the harmonic component levels of N rotation speed points corresponding to the N groups of continuously collected operation currents are abnormal or not through the current operation curve and the corresponding relation curve between different operation rotation speeds and the harmonic component values of the target current.
Step S140, if it is determined that the running current of the motor is in a harmonic abnormal state, performing a preset adjustment operation on the rotation speed of the motor.
When the motor is in a normal harmonic running state, the running noise of the motor is in a good state, and no external means are needed for intervention; when the motor is in an abnormal harmonic wave (harmonic abnormal) running state, the noise of the motor running is in an abnormal state; at this time, a preset adjustment operation is required for the rotation speed of the motor. The preset adjusting operation is frequency swinging processing. The quick frequency swinging treatment is carried out on the points of the motor, which are easy to generate noise, so that the rotating speed of the motor can be quickly increased or reduced, the abnormal harmonic content points can be quickly skipped, the possibility of exciting the noise by the abnormal energy points is avoided, and good hearing feeling is obtained.
In some embodiments, performing a preset adjustment operation on the running speed of the motor includes: and sending an adjusting instruction to increase the rotating speed adjusting speed of the motor by N times.
Specifically, if the motor is in the process of acceleration adjustment, an adjustment instruction is sent to increase the speed of rotation of the motor by N times; n is more than or equal to 3. More specifically, if the motor is in the process of acceleration adjustment, the rotational speed of the motor needs to be subjected to acceleration processing, so that the rotational speed of the motor can be rapidly increased with less noise to reach a rotational speed at which the abnormal harmonic component point is skipped. For example, an adjustment command is sent to increase the rotational speed adjustment rate of the motor by 3 times, and acceleration processing is performed.
If the motor is in the process of speed reduction adjustment, sending an adjustment instruction to increase the speed of rotation of the motor by N times; n is more than or equal to 3. More specifically, if the motor is in the process of deceleration adjustment, the rotational speed of the motor needs to be decelerated, so that the rotational speed of the motor can be rapidly reduced under less noise to reach a rotational speed at which the abnormal harmonic component point is skipped. For example, an adjustment command is sent to increase the speed of rotation speed adjustment by 3 times, and deceleration processing is performed.
Optionally, the current rotational speed, current, voltage and/or power is recorded at the current abnormal harmonic component rotational speed point. Monitoring the running rotating speed and current in real-time control to analyze out harmonic components; the voltage and the power are monitored to adjust the adjusting speed according to the range of the voltage and the power, and when the voltage and the power are in a high rotating speed and high power section, the adjusting speed needs to be reduced, so that the phenomenon that the voltage or the power is overshot, the system oscillates or exceeds the bearable working voltage or power, and the controller is in fault is avoided.
Optionally, after the adjusting step performs a preset adjusting operation on the running rotation speed of the motor, the collecting step, the acquiring step and the comparing step are performed again; and if the comparison step determines that the running current of the motor is in a harmonic abnormal state, executing the adjustment step again. That is, after a preset adjustment operation is performed on an operation rotation speed of the motor, the operation current of the motor is sampled again, a current operation curve is generated according to the operation current obtained by sampling, a corresponding operation rotation speed is obtained according to the current operation curve, a current harmonic component value at the corresponding operation rotation speed is obtained, the obtained current harmonic component value is compared with a target current harmonic component value at the preset corresponding operation rotation speed to determine whether the operation current of the motor is in a harmonic abnormal state, if the operation current of the motor is determined to be in the harmonic abnormal state, the adjustment step is performed again, the operation of the motor is performed until a point with the abnormal harmonic component is skipped, the original operation state is restored, and the motor is operated according to the original operation speed and acceleration.
The embodiment of the invention essentially avoids overlong stay time of the motor at an abnormal rotating speed point by changing the adjusting speed, is easy to excite the noise model, and utilizes the change speed of the electric signal to be far greater than the change speed of the mechanical signal. Fig. 5a shows a schematic diagram of the change in rotational speed without adjusting the rotational speed adjustment rate. Fig. 5b shows a schematic diagram of the rotational speed variation of the present invention for adjusting the rotational speed adjustment rate. The horizontal axis is an adjusting signal, the vertical axis is a rotating speed, and when the invention is not adopted, harmonic components of abnormal rotating speed points are easier to excite noise points in the slow adjusting process of the rotating speed, so that bad hearing feeling is caused. By adopting the invention, the points of the motor, which are easy to generate noise, are subjected to rapid adjustment processing, so that the rotating speed of the motor can be rapidly increased or reduced, thereby rapidly skipping over abnormal harmonic content points, avoiding the possibility of exciting noise by abnormal energy rotating speed points and obtaining good auditory feeling.
In order to clearly illustrate the technical scheme of the invention, the implementation flow of the motor control method provided by the invention is described in the following by a specific embodiment.
Fig. 4 is a schematic diagram of a motor control method according to an embodiment of the present invention. As shown in fig. 4, the current running current of the motor is sampled, and a current running curve is generated according to the sampled running current; reading the current operation rotating speed according to the current operation curve, and obtaining a current harmonic component value under the corresponding operation rotating speed; judging whether the harmonic component is abnormal; and if the harmonic component is abnormal, carrying out preset adjustment operation on the rotating speed of the motor. If the motor is in the acceleration adjustment process, an adjustment instruction is sent to enable the rotating speed adjustment rate of the motor to be increased by N times; if the motor is in the process of speed reduction adjustment, an adjustment instruction is sent to enable the speed adjustment rate of the motor to be increased by N times, or braking treatment is carried out to accelerate speed reduction.
Fig. 6 is a block diagram of an embodiment of a motor control device according to the present invention. As shown in fig. 6, the motor control device 100 includes a sampling unit 110, an acquisition unit 120, a comparison unit 130, and an adjustment unit 140.
The sampling unit 110 is configured to sample an operation current of the motor, and generate a current operation curve according to the operation current obtained by the sampling.
Specifically, the sampling unit 110 samples the running voltages and running currents of the U-phase, V-phase and W-phase of the motor, and combines the bus voltage and the bus current under the current working condition of the motor to obtain the real-time running power P (p=u×i) of the motor. And drawing a current running curve of the motor according to the sampling result of the running current. Referring to fig. 2, fig. 2 is a schematic diagram of a process for sampling the operating voltages and operating currents of the U-, V-, and W-phases. As shown in fig. 2, a corresponding operating speed can be obtained from the operating current.
The obtaining unit 120 is configured to obtain a corresponding operation rotational speed according to the current operation curve, and obtain a current harmonic component value at the corresponding operation rotational speed.
Specifically, the corresponding operating speed can be obtained according to the current operating curve. For example, the rotational speed n=60 f/p of the synchronous machine, p representing the pole pair number of the machine, f referring to the frequency of the stator current, f being known, the rotational speed N can be calculated. The harmonic component value of the current at a certain rotation speed point (the harmonic component value can represent the level of the noise value) can be calculated and analyzed according to the current operation curve based on the rotation speed point.
The comparing unit 130 is configured to compare the obtained current harmonic component value with a target current harmonic component value at a preset corresponding operation speed, so as to determine whether the operation current of the motor is in a harmonic abnormal state.
In some embodiments, a correspondence curve between the motor operation speed and the target current harmonic component value is preset and stored, and the comparing unit 130 determines the target current harmonic component value at the corresponding operation speed according to the preset correspondence curve between the motor operation speed and the target current harmonic component value, so as to compare the obtained current harmonic component value with the target current harmonic component value at the preset corresponding operation speed, so as to determine whether the operation current of the motor is in a harmonic abnormal state. The target current harmonic component value is specifically a maximum harmonic component value acceptable at the corresponding operating speed beyond which noise becomes unacceptable.
For example, the correspondence curves of different operation speeds and target current harmonic component values are stored in advance in the controller. And comparing the harmonic component value corresponding to the currently acquired rotating speed with the harmonic component value of the target current stored by the controller, and judging whether the harmonic component level of the rotating speed point is abnormal or not. When the obtained current harmonic component value is smaller than a target current harmonic component value under a preset corresponding running rotating speed, judging that the running current of the motor is in a harmonic normal state and is in a normal harmonic running state; when the obtained current harmonic component value is greater than or equal to a target current harmonic component value under a preset corresponding running rotating speed, the running current of the motor can be judged to be in a harmonic abnormal state, a high-frequency noise signal can be excited, and the abnormal harmonic running state is achieved. The above process may refer to fig. 3, and fig. 3 shows a schematic diagram of comparing whether the harmonic component level of the rotation speed point is abnormal or not through a current operation curve and a corresponding relation curve of different operation rotation speeds and a target current harmonic component value.
Optionally, comparing whether the harmonic component levels of N rotation speed points corresponding to the N groups of continuously collected operation currents are abnormal or not through the current operation curve and the corresponding relation curve between different operation rotation speeds and the harmonic component values of the target current.
The adjusting unit 140 is configured to perform a preset adjusting operation on the rotation speed of the motor if it is determined that the running current of the motor is in a harmonic abnormal state.
When the motor is in a normal harmonic running state, the running noise of the motor is in a good state, and no external means are needed for intervention; when the motor is in an abnormal harmonic wave (harmonic abnormal) running state, the noise of the motor running is in an abnormal state; at this time, a preset adjustment operation is required for the rotation speed of the motor. The preset adjusting operation is frequency swinging processing. The quick frequency swinging treatment is carried out on the points of the motor, which are easy to generate noise, so that the rotating speed of the motor can be quickly increased or reduced, the abnormal harmonic content points can be quickly skipped, the possibility of exciting the noise by the abnormal energy points is avoided, and good hearing feeling is obtained.
In some embodiments, the adjusting unit 140 performs a preset adjustment operation on the running speed of the motor, including: and sending an adjusting instruction to increase the rotating speed adjusting speed of the motor by N times.
Specifically, if the motor is in the process of acceleration adjustment, the adjustment unit 140 sends an adjustment instruction to increase the speed of rotation adjustment of the motor by N times; n is more than or equal to 3. More specifically, if the motor is in the process of acceleration adjustment, the rotational speed of the motor needs to be subjected to acceleration processing, so that the rotational speed of the motor can be rapidly increased with less noise to reach a rotational speed at which the abnormal harmonic component point is skipped. For example, an adjustment command is sent to increase the rotational speed adjustment rate of the motor by 3 times, and acceleration processing is performed.
If the motor is in the process of speed reduction adjustment, the adjustment unit 140 sends an adjustment instruction to increase the speed of rotation speed adjustment of the motor by N times; n is more than or equal to 3. More specifically, if the motor is in the process of deceleration adjustment, the rotational speed of the motor needs to be decelerated, so that the rotational speed of the motor can be rapidly reduced under less noise to reach a rotational speed at which the abnormal harmonic component point is skipped. For example, an adjustment command is sent to increase the speed of rotation speed adjustment by 3 times, and deceleration processing is performed.
Optionally, the current rotational speed, current, voltage and/or power is recorded at the current abnormal harmonic component rotational speed point. Monitoring the running rotating speed and current in real-time control to analyze out harmonic components; the voltage and the power are monitored to adjust the adjusting speed according to the range of the voltage and the power, and when the voltage and the power are in a high rotating speed and high power section, the adjusting speed needs to be reduced, so that the phenomenon that the voltage or the power is overshot, the system oscillates or exceeds the bearable working voltage or power, and the controller is in fault is avoided.
Optionally, after the adjusting step performs a preset adjusting operation on the running rotation speed of the motor, the collecting step, the acquiring step and the comparing step are performed again; and if the comparison step determines that the running current of the motor is in a harmonic abnormal state, executing the adjustment step again. That is, after a preset adjustment operation is performed on an operation rotation speed of the motor, the operation current of the motor is sampled again, a current operation curve is generated according to the operation current obtained by sampling, a corresponding operation rotation speed is obtained according to the current operation curve, a current harmonic component value at the corresponding operation rotation speed is obtained, the obtained current harmonic component value is compared with a target current harmonic component value at the preset corresponding operation rotation speed to determine whether the operation current of the motor is in a harmonic abnormal state, if the operation current of the motor is determined to be in the harmonic abnormal state, the adjustment step is performed again, the operation of the motor is performed until a point with the abnormal harmonic component is skipped, the original operation state is restored, and the motor is operated according to the original operation speed and acceleration.
The embodiment of the invention essentially avoids overlong stay time of the motor at an abnormal rotating speed point by changing the adjusting speed, is easy to excite the noise model, and utilizes the change speed of the electric signal to be far greater than the change speed of the mechanical signal. Fig. 5a shows a schematic diagram of the change in rotational speed without adjusting the rotational speed adjustment rate. Fig. 5b shows a schematic diagram of the rotational speed variation of the present invention for adjusting the rotational speed adjustment rate. The horizontal axis is an adjusting signal, the vertical axis is a rotating speed, and when the invention is not adopted, harmonic components of abnormal rotating speed points are easier to excite noise points in the slow adjusting process of the rotating speed, so that bad hearing feeling is caused. By adopting the invention, the points of the motor, which are easy to generate noise, are subjected to rapid adjustment processing, so that the rotating speed of the motor can be rapidly increased or reduced, thereby rapidly skipping over abnormal harmonic content points, avoiding the possibility of exciting noise by abnormal energy rotating speed points and obtaining good auditory feeling.
According to the scheme for judging the noise and performing frequency-swinging treatment based on harmonic analysis, on-line autonomous judgment and identification can be performed on different motors under different working conditions, the harmonic type of the current motor operation is analyzed, whether the motor operation is in a noise interval is judged, and a measure of rapidly frequency-swinging based on the size of harmonic components is adopted to avoid the excitation of noise points, so that the improvement of the noise hearing of the motor is realized.
The invention also provides a storage medium corresponding to the motor control method, on which a computer program is stored, which program, when being executed by a processor, implements the steps of any of the methods described above.
The invention also provides a motor corresponding to the motor control method, which comprises a processor, a memory and a computer program stored on the memory and capable of running on the processor, wherein the processor executes the program to realize the steps of any one of the methods.
The invention also provides a motor corresponding to the motor control device, which comprises any one of the motor control devices.
According to the scheme provided by the invention, whether the harmonic component value of the motor running current is abnormal is judged by sampling the motor running current in real time and combining the current sampling curve, if so, the rotating speed of the motor is adjusted, a frequency swinging strategy is adopted, so that the noise point is prevented from being excited, the improvement of the motor noise hearing is realized, and the improvement of the whole running noise point is realized. Through the quick pendulum frequency based on harmonic component size, applicable multiple application conditions possesses autonomous identification ability, avoids when matching different loads, and the motor noise needs a large amount of rectification to match test work appears, and application scope is extensive, has realized good control effect, promotes the performance of motor.
The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software that is executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope and spirit of the invention and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwired, or a combination of any of these. In addition, each functional unit may be integrated in one processing unit, each unit may exist alone physically, or two or more units may be integrated in one unit.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate components may or may not be physically separate, and components as control devices may or may not be physical units, may be located in one place, or may be distributed over a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above description is only an example of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A motor control method, characterized by comprising:
sampling, namely sampling the running current of the motor and generating a current running curve according to the sampled running current;
an acquisition step, which is used for acquiring a corresponding operation rotating speed according to the current operation curve and acquiring a current harmonic component value under the corresponding operation rotating speed;
a comparison step, which is used for comparing the obtained current harmonic component value with a target current harmonic component value under a preset corresponding running rotating speed so as to determine whether the running current of the motor is in a harmonic abnormal state or not;
and an adjusting step, wherein if the running current of the motor is determined to be in a harmonic abnormal state, preset adjusting operation is performed on the rotating speed of the motor, and when the motor is in the harmonic abnormal state, the running noise of the motor is in an abnormal state.
2. The method of claim 1, wherein performing a preset adjustment operation of the operating speed of the motor comprises:
if the motor is in the acceleration adjustment process, an adjustment instruction is sent to increase the rotating speed adjustment rate of the motor to N times of the original rotating speed adjustment rate; n is more than or equal to 3;
if the motor is in the process of speed reduction adjustment, sending an adjustment instruction to increase the speed of rotation of the motor by N times; n is more than or equal to 3.
3. The method as recited in claim 1, further comprising:
after the preset adjustment operation is performed on the running rotation speed of the motor in the adjustment step, the sampling step, the obtaining step and the comparing step are executed again;
and if the comparison step determines that the running current of the motor is in a harmonic abnormal state, executing the adjustment step again.
4. A method according to any one of claim 1 to 3, wherein,
and determining the target current harmonic component value under the corresponding operation rotating speed according to a preset corresponding relation curve of the motor operation rotating speed and the target current harmonic component value.
5. A motor control apparatus, characterized by comprising:
the sampling unit is used for sampling the running current of the motor and generating a current running curve according to the sampled running current;
the acquisition unit is used for acquiring corresponding operation rotating speeds according to the current operation curves and acquiring current harmonic component values at the corresponding operation rotating speeds;
the comparison unit is used for comparing the obtained current harmonic component value with a target current harmonic component value under a preset corresponding running rotating speed so as to determine whether the running current of the motor is in a harmonic abnormal state or not;
and the adjusting unit is used for carrying out preset adjusting operation on the rotating speed of the motor if the running current of the motor is determined to be in a harmonic abnormal state, wherein when the motor is in the harmonic abnormal state, the running noise of the motor is in an abnormal state.
6. The apparatus according to claim 5, wherein the adjusting unit performs a preset adjustment operation of the operation rotation speed of the motor, comprising:
if the motor is in the acceleration adjustment process, an adjustment instruction is sent to increase the rotating speed adjustment rate of the motor to N times of the original rotating speed adjustment rate; n is more than or equal to 3;
if the motor is in the process of speed reduction adjustment, sending an adjustment instruction to increase the speed of rotation of the motor by N times; n is more than or equal to 3.
7. The apparatus as recited in claim 6, further comprising:
after the preset adjustment operation is carried out on the running rotating speed of the motor by the adjustment unit, the functions of the sampling unit, the acquisition unit and the comparison unit are executed again;
and if the comparison unit determines that the running current of the motor is in a harmonic abnormal state, carrying out preset adjustment operation on the rotating speed of the motor again.
8. The apparatus according to any one of claims 5 to 7, wherein,
and determining the target current harmonic component value under the corresponding operation rotating speed according to a preset corresponding relation curve of the motor operation rotating speed and the target current harmonic component value.
9. A storage medium having stored thereon a computer program which when executed by a processor performs the steps of the method of any of claims 1-4.
10. An electric machine comprising a processor, a memory and a computer program stored on the memory and executable on the processor, said processor implementing the steps of the method according to any one of claims 1 to 4 when said program is executed, comprising the electric machine control device according to any one of claims 5 to 8.
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6798886B1 (en) * | 1998-10-29 | 2004-09-28 | Paul Reed Smith Guitars, Limited Partnership | Method of signal shredding |
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| CN103501149B (en) * | 2013-10-13 | 2016-06-01 | 中国船舶重工集团公司第七一二研究所 | A kind of multiphase induction motor specifies subharmonic electric current suppressing method |
| CN105188241A (en) * | 2014-05-30 | 2015-12-23 | 湖北惠维科技股份有限公司 | Large-power HIG electronic ballast with excellent electromagnetic compatibility |
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| US6798886B1 (en) * | 1998-10-29 | 2004-09-28 | Paul Reed Smith Guitars, Limited Partnership | Method of signal shredding |
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