CN113218038B - Motor stall identification method and device, motor control device, motor and air conditioner - Google Patents

Abstract

The present invention provides a method and device for identifying a motor stall, a motor control device, a motor and an air conditioner. The motor stall identification method includes: acquiring a pulse signal of the motor to obtain a first pulse duty cycle; when the first pulse duty cycle exceeds the first duty cycle threshold interval and the duration reaches a first preset duration At _t1 , control to change the rotational speed of the motor; obtain the pulse signal of the motor again to obtain a second pulse duty cycle; when the second pulse duty cycle exceeds the second duty cycle threshold interval, and the duration is When the second preset time period t ₂ is reached, it is determined that the motor is in a locked-rotor fault. Solved the problem that the motor stall could not be recognized when the Hall signal changed position.

Description

Motor stall identification method and device, motor control device, motor and air conditioner

technical field

The present invention relates to the technical field of motor control, and in particular, to a motor locked-rotor identification method, a motor locked-rotor identification device, a motor control device, a motor and an air conditioner.

Background technique

At present, the application of air conditioners is more and more extensive, and the motor of the air conditioner often has a stall situation, especially the DC motor driven by the hardware solution, wherein the speed feedback of the DC motor outputs the corresponding pulse signal through the Hall sensor.

Therefore, when the DC motor is locked, the DC motor is jittered and is at the Hall signal conversion position; at this time, although the Hall sensor can still output a pulse signal, at this time, the locked rotor cannot be identified.

SUMMARY OF THE INVENTION

The present invention solves the problem that the motor can not be identified when the Hall signal is switched.

In order to solve the above problem, an embodiment of the present invention provides a motor stall identification method, including: acquiring a pulse signal of a motor to obtain a first pulse duty cycle; when the first pulse duty cycle exceeds the first duty cycle When the threshold interval and the duration reaches the first preset time length, the speed of the motor is controlled to be changed; the pulse signal of the motor is obtained again to obtain a second pulse duty cycle; when the second pulse duty cycle exceeds the first When two duty cycle threshold intervals and the duration reaches a second preset time length, it is determined that the motor is in a stalled-rotor fault.

Compared with the prior art, the technical effect achieved by adopting this technical solution: when the motor stalls fault, the pulse duty cycle of the motor is abnormal; and the abnormal pulse duty cycle is detected for the first time. When the rotation speed of the motor is controlled, and the abnormality of the pulse duty cycle is detected again, the stalled rotor fault of the motor can be determined; the stalled rotor can be accurately identified without adding additional components, and the cost is low , the reliability of the motor is high.

In an embodiment of the present invention, the method for identifying a motor stalled rotor further includes: when it is determined that the motor is the stalled rotor fault, controlling and displaying the stalled rotor fault.

In an embodiment of the present invention, the first duty cycle threshold interval includes a first duty cycle threshold value and a second duty cycle threshold value, and the first duty cycle threshold value is smaller than the second duty cycle threshold value; so The first pulse duty cycle exceeds the first duty cycle threshold interval; including: the first pulse duty cycle is smaller than the first duty cycle threshold, or the first pulse duty cycle is greater than the first pulse duty cycle Two duty cycle thresholds.

In an embodiment of the present invention, the controlling to change the rotational speed of the motor includes: controlling to increase the rotational speed of the motor.

In an embodiment of the present invention, the controlling to change the rotational speed of the motor includes: controlling the rotational speed of the motor to increase by 1 or 2 times.

The technical effect achieved by adopting this technical solution: controlling and increasing the rotational speed of the motor can increase the output torque of the motor, and if the pulse duty cycle is still abnormal, it is determined that the motor is locked-rotor fault.

In yet another aspect, an embodiment of the present invention further provides a device for identifying a motor stall, comprising: The first acquisition module is used to acquire the pulse signal of the motor to obtain the first pulse duty cycle; the motor control module is used to obtain the first pulse duty cycle when the first pulse duty cycle exceeds the first duty cycle threshold interval and the duration reaches the first When a preset time period is used, the rotation speed of the motor is controlled to be changed; the second acquisition module is used to obtain the pulse signal of the motor again to obtain the second pulse duty ratio; the locked-rotor judgment module is used to When the pulse duty cycle exceeds the second duty cycle threshold interval and the duration reaches the second preset time length, it is determined that the motor is in a stalled-rotor fault.

On the other hand, an embodiment of the present invention also provides a motor control device, comprising: a Hall sensor, which is arranged on a target motor to obtain a pulse signal of the target motor; a processor, which is connected to the Hall sensor in a signal, and also control and connect the target motor; it is used to obtain the pulse signal output by the hall sensor to obtain the first pulse duty cycle; when the first pulse duty cycle exceeds the first duty cycle threshold interval, and the duration reaches the first When the preset time period is used, the speed of the target motor is controlled to be changed; the pulse signal output by the Hall sensor is obtained again to obtain a second pulse duty cycle; when the second pulse duty cycle exceeds the second duty cycle threshold When the interval and the duration reaches the second preset duration, it is determined that the target motor is a locked-rotor fault.

In an embodiment of the present invention, the motor control device further includes: a display module, which is connected to the processor with a signal; when the target motor is locked and faulty, the display module under the control of the processor displays the Stall failure.

In another aspect, an embodiment of the present invention further provides a motor, including: a motor body; the motor control device according to any one of the above embodiments; wherein the processor controls the connection to the motor body, the Hall A sensor is provided on the motor body.

In another aspect, an embodiment of the present invention further provides an air conditioner, including a memory storing a computer program and a packaged IC, and when the computer program is read and executed by the packaged IC, the air conditioner implements any one of the above The motor stall identification method described in this embodiment.

To sum up, the above-mentioned embodiments of the present application may have one or more of the following advantages or beneficial effects: i) accurately identify the stall fault through the change of motor speed; ii) do not use additional components, and the cost is low; iii) relatively Fewer components make the motor run with high reliability.

Description of drawings

FIG. 1 is a schematic flowchart of a method for identifying a motor stall according to a first embodiment of the present invention.

FIG. 2A is a structural diagram of a normal feedback pulse waveform.

2B-2E are respectively structural diagrams of abnormal feedback pulse waveforms.

FIG. 3 is a schematic block diagram of a motor stall identification device 100 according to a second embodiment of the present invention.

FIG. 4 is a schematic structural diagram of a motor control device 200 according to a third embodiment of the present invention.

FIG. 5 is a schematic structural diagram of a motor 300 according to a fourth embodiment of the present invention.

FIG. 6 is a schematic structural diagram of an air conditioner 400 according to a fifth embodiment of the present invention.

FIG. 7 is a schematic block diagram of a readable storage medium 500 according to a sixth embodiment of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more clearly understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[First Embodiment]

Referring to FIG. 1 , which is a schematic flowchart of a method for identifying a motor stall according to a first embodiment of the present invention. The motor stall identification method includes:

In step S10, a pulse signal of the motor is obtained to obtain a first pulse duty ratio.

For example, a Hall sensor may be used to monitor the rotation state of the motor to obtain a corresponding pulse signal, thereby obtaining the first pulse duty ratio.

Step S20 , when the duty ratio of the first pulse exceeds the first duty ratio threshold interval and the duration reaches a first preset duration, control to change the rotational speed of the motor.

In this state, the pulse duty cycle of the motor is abnormal, which may be because the motor is locked and a fault occurs; it may also be because the motor is locked and shakes, and the sensor is in the signal conversion position. Therefore, at this time, it is impossible to judge whether the motor is blocked or not. Wherein, the sensor is, for example, a Hall sensor.

Therefore, in this case, the rotational speed of the motor is changed, and the detection of the pulse signal is continued.

In step S30, the pulse signal of the motor is obtained again to obtain a second pulse duty ratio.

After step S20, continue to detect the pulse signal, it is necessary to determine whether the motor is really locked according to the pulse signal again.

Step S40, when the duty cycle of the second pulse exceeds the second duty cycle threshold interval and the duration reaches a second preset time length, it is determined that the motor is in a locked-rotor fault.

In this case, it means that when the rotational speed of the motor changes, the pulse duty cycle is still abnormal, so that it can be determined that the fault is stalled, rather than a problem caused by the Hall sensor in the signal conversion position.

In a specific embodiment, the controlling to change the rotational speed of the motor includes but is not limited to the following two ways:

The first way is to control to increase the rotational speed of the motor, that is, increase on the basis of the original rotational speed of the motor. By increasing the rotational speed of the electric motor, the torque of the electric motor can be increased. If the motor is locked and shakes and the sensor is in the signal conversion position, when the torque of the motor is increased, the pulse duty cycle is still abnormal, it can be determined that the motor is locked.

In the second method, the rotational speed of the motor is controlled to be doubled, for example, the rotational speed of the motor is increased to 1 or 2 times the original rotational speed; an effect similar to that of the first method can be achieved, which will not be repeated here.

In a specific embodiment, the method for identifying the motor stalled rotor further includes: when it is determined that the motor is the stalled rotor fault, controlling a corresponding display device to display the stalled rotor fault; of course, it can also control a corresponding alarm. Alarms, such as control buzzer alarms.

In a specific embodiment, in step S20, the first duty cycle threshold interval includes a first duty cycle threshold value and a second duty cycle threshold value greater than the first duty cycle threshold value. Wherein, the first pulse duty cycle is smaller than the first duty cycle threshold, or the first pulse duty cycle is greater than the second duty cycle threshold; or, the first pulse duty cycle outside the range of the first duty cycle threshold and the second duty cycle threshold.

At this time, it is determined that the duty ratio of the first pulse is abnormal, and when the first pulse continues to be abnormal for a first preset time period, the rotation speed of the motor is controlled to be changed.

Similarly, in step S40, the second duty cycle threshold interval is set similarly to the first duty cycle threshold interval; and the second preset duration may be the same as the first preset duration or different, and will not be repeated here.

The following describes the motor stall identification method in detail in combination with specific usage scenarios.

A certain motor device is provided with a Hall sensor, and the Hall sensor obtains the rotation feedback of the motor device and outputs a pulse signal to a corresponding driver or processor.

Wherein, when the motor device operates normally, the driver obtains the normal pulse signal fed back by the Hall sensor, and the waveform of the pulse signal is shown in FIG. 2A. From this, it can be seen that when the pulse duty ratio is 50% , the pulse signal is normal.

The waveform of the pulse signal fed back by the Hall sensor is the abnormal feedback waveform shown in any one of FIG. 2B to FIG. 2E , and the waveform of the pulse signal lasts for the duration of the abnormal feedback waveform that reaches the first preset. duration; at this time, the control changes the rotational speed of the motor device, for example, the rotational speed may be increased to twice the original speed. Of course, the abnormal feedback waveform is not limited to the waveform structures shown in FIG. 2B to FIG. 2E , but may also be other waveform structures, which will not be repeated here.

After the rotational speed of the motor device is changed, the Hall sensor continues to acquire pulse signals. If the waveform of the pulse signal continues to be the abnormal feedback waveform, and the duration reaches a second preset duration, it may be determined that the motor device is in a locked-rotor fault.

When it is determined that the motor device is locked-rotor fault, the corresponding display screen is controlled to display the locked-rotor fault information; the corresponding alarm device can also be controlled to issue an alarm signal.

[Second Embodiment]

Referring to FIG. 3 , which is a schematic block diagram of a device for identifying a motor stall according to a second embodiment of the present invention. The motor stall identification device 100 includes, for example: a first acquisition module 110 for acquiring a pulse signal of the motor to obtain a first pulse duty cycle; a motor control module 120 for when the first pulse duty cycle exceeds the first When the duty cycle threshold interval and the duration reaches the first preset time length, the rotation speed of the motor is controlled to be changed; the second acquisition module 130 is configured to obtain the pulse signal of the motor again to obtain the second pulse duty cycle; The locked-rotor determination module 140 is configured to determine that the motor is a locked-rotor fault when the duty cycle of the second pulse exceeds a second duty cycle threshold interval and the duration reaches a second preset duration.

In a specific embodiment, the first collection module 110 , the motor control module 120 , the second collection module 130 and the locked-rotor determination module 140 of the motor locked-rotor identification device 100 cooperate to realize the motor locked-rotor described in the first embodiment above. The identification method will not be repeated here.

[Third Embodiment]

Referring to FIG. 4 , it is a schematic structural diagram of a motor control device provided by a third embodiment of the present invention. The motor control device 200 includes, for example, a processor 210 and a Hall sensor 220 electrically connected to the processor 210; and may also include a display module 230 electrically connected to the processor 210, and the display module 230 may be an LED display screen.

Wherein, the Hall sensor 220 may be provided in the target motor, so as to acquire the pulse signal fed back by the rotation of the target motor, and transmit it to the processor 210 . The process 210 controls the connection of the target motor, acquires the pulse signal, and executes the motor stall identification method as described in the first embodiment.

The processor 210 also controls the display module 230 to display the locked-rotor fault when it is judged that the target motor is a locked-rotor fault.

[Fourth Embodiment]

Referring to FIG. 5 , it is a schematic structural diagram of a motor according to a fourth embodiment of the present invention. The motor 300 includes, for example, the motor control device 200 and the motor body 310 as described in the third embodiment. Wherein, the hall sensor 220 of the motor control device 200 is provided on the motor body 310 to obtain the pulse signal of its rotation feedback, and the processor 210 controls the connection to the motor body 310 .

Wherein, the motor 300 can implement the motor stall identification method as described in the first embodiment, which will not be repeated here.

[Fifth Embodiment]

Referring to FIG. 6 , which is a schematic block diagram of an air conditioner according to a fifth embodiment of the present invention, the air conditioner 400 includes, for example, a packaged IC 420 and a memory 410 electrically connected to the packaged IC 420 , the memory 410 stores a computer program 411 , and the computer When the program 411 is read and executed by the packaged IC 420, the air conditioner 400 implements the motor stall identification method described in the first embodiment above.

In a specific embodiment, the packaged IC 420 is, for example, a processor chip, and the processor chip is electrically connected to the memory 410 to read and execute the computer program. The packaged IC 420 can also be a packaged circuit board, and the circuit board is packaged with a processor chip that can read and execute the computer program 411 ; of course, the circuit board can also package the memory 410 .

On the other hand, the processor chip may also be provided with the motor stall identification device 100 described in the second embodiment, and the processor chip may implement the motor described in the first embodiment through the motor stall identification device 100 . The locked-rotor identification method will not be repeated here.

On the other hand, the air conditioner 400 may also be provided with the motor control device 200 as described in the third embodiment, or the motor 300 as described in the fourth embodiment. The air conditioner 400 uses the motor control device 200 or the motor 300 to implement the motor stall identification method described in the first embodiment, which will not be repeated here.

[Sixth Embodiment]

Referring to FIG. 7 , which is a schematic structural diagram of a readable storage medium provided by the sixth embodiment of the present invention, the readable storage medium 500 is, for example, a non-volatile memory, for example, a magnetic medium (such as a hard disk, a floppy disk and a magnetic tape), optical media (such as CDROM discs and DVDs), magneto-optical media (such as optical disks), and hardware devices specially constructed for the storage and execution of computer-executable instructions (such as read only memory (ROM), random access memory ( RAM), flash memory, etc.). The readable storage medium 500 has computer-executable instructions 510 stored thereon. The readable storage medium 500 can be executed by one or more processors or processing devices to execute the computer-executable instructions 510, so that the electrical equipment in which it is located, such as an air conditioner, implements the motor stall identification method described in the first embodiment.

Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be based on the scope defined by the claims.

Claims (10)

1. a motor stall identification method, is characterized in that, comprises: Through the Hall sensor, the pulse signal of the motor is obtained, and the first pulse duty ratio is obtained; When the duty cycle of the first pulse exceeds the first duty cycle threshold interval and the duration reaches a first preset duration, controlling the rotational speed of the motor to be changed; Through the Hall sensor, the pulse signal of the motor is obtained again, and the second pulse duty ratio is obtained; When the duty cycle of the second pulse exceeds the second duty cycle threshold interval and the duration reaches a second preset time period, it is determined that the motor is in a locked-rotor fault. 2. The motor stall identification method according to claim 1, characterized in that, further comprising: When it is determined that the motor is the locked rotor fault, the control displays the locked rotor fault. 3 . The motor stall identification method according to claim 1 , wherein the first duty cycle threshold interval comprises a first duty cycle threshold value and a second duty cycle threshold value, and the first duty cycle threshold value is 3 . The threshold is less than the second duty cycle threshold; the first pulse duty cycle exceeds the first duty cycle threshold interval; including: The first pulse duty cycle is smaller than the first duty cycle threshold, or the first pulse duty cycle is greater than the second duty cycle threshold. 4. The motor stall identification method according to claim 1, wherein the control changes the rotational speed of the motor; comprising: Control increases the rotational speed of the motor. 5. The motor stall identification method according to claim 1, wherein the control changes the rotational speed of the motor; comprising: Control the rotational speed of the motor to increase by a factor of 1 or 2. 6. A motor stall identification device, characterized in that, comprising: The first acquisition module is used to acquire the pulse signal of the motor to obtain the first pulse duty ratio; a motor control module, configured to control and change the rotational speed of the motor when the first pulse duty cycle exceeds the first duty cycle threshold interval and the duration reaches a first preset duration; The second acquisition module is used to acquire the pulse signal of the motor again to obtain the second pulse duty ratio; A locked-rotor judgment module, configured to determine that the motor is a locked-rotor fault when the second pulse duty cycle exceeds the second duty cycle threshold interval and the duration reaches a second preset duration; The Hall sensor is arranged on the target motor to obtain the pulse signal of the target motor. 7. A motor control device, characterized in that, comprising: Hall sensor, located in the target motor, to obtain the pulse signal of the target motor; The processor is connected to the Hall sensor by a signal, and also controls the connection to the target motor; it is used to obtain the pulse signal output by the Hall sensor to obtain a first pulse duty cycle; when the first pulse duty cycle exceeds the first When the duty cycle threshold interval and the duration reaches the first preset time length, the speed of the target motor is controlled to be changed; the pulse signal output by the Hall sensor is obtained again to obtain the second pulse duty cycle; When the duty cycle of the two pulses exceeds the second duty cycle threshold interval, and the duration reaches the second preset duration, it is determined that the target motor is a stalled-rotor fault. 8. The motor control device of claim 7, further comprising: The display module is connected to the processor with a signal, and is used for displaying the locked rotor fault under the control of the processor when the target motor is locked and faulty. 9. A motor, characterized in that, comprising: motor body; The motor control device according to any one of claims 7 or 8; wherein the processor controls the connection to the motor body, and the Hall sensor is provided on the motor body. 10. An air conditioner, characterized in that it comprises a memory storing a computer program and a packaged IC, and when the computer program is read and executed by the packaged IC, the air conditioner implements the method according to any one of claims 1-5. The motor stall identification method described in the item.

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