Non-inductive fan locked-rotor detection method and device

Abstract

The invention provides a non-inductive fan locked-rotor detection method and device, and the method comprises the steps: receiving a control instruction sent by a controller when a non-inductive fan enters a transition stage, so as to enable the interior of the non-inductive fan to form a circuit loop; acquiring sampling data of the motor at the target rotating speed in the transition stage; respectively acquiring an electric frequency corresponding to the sampling data and a terminal voltage of a motor based on the sampling data; and judging whether the non-inductive fan is locked or not according to the electric frequency corresponding to the sampling data and the terminal voltage of the motor. The method is separated from a complex observer algorithm, a switch of the inverter is independently controlled, whether the non-inductive fan is locked or not is detected by forming a loop in the motor of the non-inductive fan, interference is not likely to happen, and the calculation method is simple and reliable.

Description

Technical Field

[0001] The present application belongs to the technical field of motor control, and relates to a method and device for detecting stall of a non-sensing fan. Background Art

[0002] Motor stall is a situation where the motor still outputs torque when the speed is zero. The efficiency of the motor is zero when it is stalled, and the current during stall can reach up to 7 times the rated current or even higher, which will burn out the motor if it lasts for a long time.

[0003] At present, considering the cost and application environment, most of the fans on the market are controlled by sensorless control. Sensorless motor stall detection usually uses input and output power comparison or speed feedback angle change calculated by complex observer algorithm to determine whether it is stalled. Although it improves the detection accuracy, the observer algorithm will increase the complexity of the system and require more computing resources and processing time. Summary of the invention

[0004] The present application provides a method and device for detecting a stall of a sensorless fan, which are used to solve the problem of increased system complexity and waste of computing resources and processing time caused by using a complex observer algorithm to determine a stall of a sensorless fan.

[0005] In a first aspect, the present application provides a method for detecting stalled rotor of a non-inductive fan. The method comprises: obtaining sampling data of a motor at a target speed during a transition phase; obtaining an electrical frequency and a terminal voltage of the motor corresponding to the sampling data based on the sampling data; and determining whether the non-inductive fan is stalled according to the electrical frequency and the terminal voltage of the motor corresponding to the sampling data.

[0006] In an implementation of the first aspect, before acquiring sampling data of the motor in the transition phase, the method further includes: when the sensorless fan enters the transition phase, receiving a control instruction sent by a controller to form a circuit loop inside the sensorless fan.

[0007] In an implementation of the first aspect, a control instruction sent by a controller is received to form a circuit loop inside the sensorless wind turbine, including: receiving a PWM control signal sent by the controller to turn on the lower bridge of an inverter connected to the sensorless wind turbine and turn off the upper bridge of the inverter.

[0008] In an implementation of the first aspect, receiving a PWM control signal sent by a controller to turn on the lower bridge of an inverter connected to a sensorless wind turbine and turn off the upper bridge of the inverter includes: receiving a first PWM signal sent by the controller to turn off the inverter; receiving a second PWM signal sent by the controller to turn on the lower bridge of the inverter.

[0009] In an implementation of the first aspect, the sampling data is a voltage drop across a sampling resistor, and obtaining the terminal voltage of the motor based on the sampling data includes: calculating the current flowing through the motor based on the voltage drop across the sampling resistor; and calculating the terminal voltage of the motor based on the current flowing through the motor and the motor resistance.

[0010] In an implementation of the first aspect, acquiring the electrical frequency corresponding to the sampled data based on the sampled data includes: acquiring the actual rotation speed of the motor according to the acquired terminal voltage of the motor; and calculating the electrical frequency corresponding to the sampled data based on the actual rotation speed of the motor.

[0011] In an implementation of the first aspect, judging whether the inductive fan is stalled based on the electrical frequency corresponding to the sampling data and the terminal voltage of the motor includes: judging whether the difference between the electrical frequency corresponding to the sampling data and the first electrical frequency in the open-loop stage meets a first preset condition; and judging whether the difference between the terminal voltage of the motor and the induced electromotive force of the motor at the target speed meets a second preset condition; if both the first preset condition and the second preset condition are met, the inductive fan is stalled.

[0012] In an implementation of the first aspect, the first preset condition is: the difference between the electrical frequency corresponding to the sampling data and the first electrical frequency in the open-loop stage is greater than a first threshold; the second preset condition is: the difference between the terminal voltage of the motor and the induced electromotive force of the motor at the target speed is greater than a second threshold.

[0013] In a second aspect, the present application provides a device for detecting stalled rotor of a non-inductive fan. The device comprises: an acquisition module, a data processing module and a judgment module; the acquisition module is used to obtain sampled data of the motor at a target speed during a transition phase; the data processing module is used to obtain the electrical frequency corresponding to the sampled data and the terminal voltage of the motor based on the sampled data; the judgment module is used to judge whether the non-inductive fan is stalled according to the electrical frequency corresponding to the sampled data and the terminal voltage of the motor.

[0014] In an implementation of the second aspect, the device further includes: a control module; the control module is used to receive a control instruction sent by the controller to form a circuit loop inside the inductive fan.

[0015] As described above, the non-sensing fan stall detection method and device described in the present application have the following beneficial effects:

[0016] The present application is separated from the complex observer algorithm and independently controls the switch of the inverter. By forming a loop inside the motor of the inductive fan, it is possible to detect whether the inductive fan is blocked. This is not only not susceptible to interference but also has a simple and reliable calculation method. The present application does not require the addition of an additional voltage detection loop, which greatly saves costs and reduces the complexity of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Shown is a flow chart of the non-sensing fan stall detection method described in an embodiment of the present application.

[0018] Figure 2 Shown is a schematic diagram of the relationship between the PWM signal, output current and terminal voltage described in an embodiment of the present application.

[0019] Figure 3 Shown is the circuit formed by the motor itself of the sensorless blower described in the embodiment of the present application.

[0020] Figure 4 Shown is a flow chart of a non-sensing fan stall detection method according to another embodiment of the present application.

[0021] Figure 5 Shown is a schematic diagram of the structure of the non-sensing fan stall detection device described in an embodiment of the present application.

[0022] Component number description

[0023] 500 Non-sensing fan stall detection device

[0024] 510 acquisition module

[0025] 520 Data processing module

[0026] 530 Judgment Module

[0027] 540 Control Module

[0028] A Output current signal

[0029] B PWM signal

[0030] C Motor terminal voltage signal

[0031] 31 Motor inductance

[0032] 32 Motor resistance

[0033] 33 Induced electromotive force

[0034] Steps S1 to S3 DETAILED DESCRIPTION

[0035] The following describes the embodiments of the present application through specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict.

[0036] It should be noted that the illustrations provided in the following embodiments are only used to illustrate the basic concept of the present application in a schematic manner, and therefore the illustrations only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0037] In addition, in this application, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0038] Stall detection of sensorless fans is an important protection function that can ensure that the motor is not damaged under abnormal circumstances. Stall detection of sensorless fans usually relies on the observation of back-EMF. In the case of stall, the motor's power will be lost and the back-EMF will change abnormally. By real-time monitoring of whether the back-EMF is reasonable, it can be determined whether the motor is stalled.

[0039] In some schemes, the voltage and current of the αβ coordinate system are transformed to the vertical γδ coordinate system through Park by an observer, and the back electromotive force of the γδ coordinate system is output. By comparing the back electromotive force output by the observer with the back electromotive force calculated according to the rotation speed and the back electromotive force coefficient, if the difference between the two is large and exceeds the threshold, it can be determined as a stall event. However, these methods are relatively complex and require access to an observer for detection. Although the detection accuracy is improved, the observer algorithm will increase the complexity of the system and require more computing resources and processing time.

[0040] At least for the above-mentioned problems, the present application provides a method and device for detecting stalled rotor of a non-inductive fan. After reaching the target speed in the open-loop dragging stage of starting the non-inductive fan, the inverter output is stopped, so that the non-inductive fan generates an induced electromotive force during the inertial rotation process. In the transition stage, the upper bridge of the inverter is controlled to be cut off and the lower bridge is turned on, so that a circuit loop is formed inside the non-inductive fan. By collecting the sampling data of the internal circuit loop of the non-inductive fan, it is judged whether the motor of the non-inductive fan is stalled with the obtained induced electromotive force. The non-inductive fan stalled rotor detection method and device of the present application does not need to add an additional voltage detection circuit, which greatly saves costs and reduces the complexity of the system.

[0041] The startup process of the non-inductive fan mainly includes:

[0042] Open-loop drag stage: In this stage, the q-axis current is first set to a value that can drag the rotor, the d-axis current is set to 0, the angle is set to 0 and rotates according to the set direction and frequency, and the inverse Park transformation and SVPWM are performed to generate a rotating magnetic field to drag the rotor. The sensorless fan is started according to the preset output current to make the motor speed of the sensorless fan reach the target speed;

[0043] Transition stage (I / F forced drag stage): Since the back electromotive force generated when the motor is at low speed is small, the angle and speed observed by the sliding mode observer are not accurate. Therefore, the motor speed must be increased to a certain value through forced drag, and then the angle observed by the sliding mode observer is switched to control;

[0044] Speed ​​closed-loop stage (speed open-loop to closed-loop stage): When the motor speed and angle estimation are stable, switch to current-speed dual closed-loop control mode.

[0045] In an embodiment of the present application, when the sensorless fan starts and enters the transition stage, the PWM signal is controlled and adjusted to form a closed loop inside the motor, and by collecting sampling data, it is determined whether the sensorless fan is blocked. There is no need to add an additional voltage detection circuit, which greatly saves costs and reduces the complexity of the system.

[0046] The technical solutions in the embodiments of the present application will be described in detail below in conjunction with the drawings in the embodiments of the present application.

[0047] See also Figure 1 , which is a flow chart of the non-sensing fan stall detection method described in the embodiment of the present application. Figure 1 As shown, the non-inductive fan stall detection method includes the following steps S1 to S3.

[0048] Step S1, obtaining sampling data of the motor in the transition phase.

[0049] In this embodiment, when the motor speed of the sensorless fan reaches the target speed, the first PWM signal sent by the controller is received to cut off the upper bridge and the lower bridge of the inverter connected to the sensorless fan, and then the second PWM signal sent by the controller is received to turn on the lower bridge of the inverter.

[0050] Figure 2 Shown is a schematic diagram of the relationship between the PWM signal, output current and terminal voltage described in an embodiment of the present application.

[0051] like Figure 2 As shown, A represents the output current signal, B represents the PWM signal, and C represents the terminal voltage signal of the motor. Among them, the PWM signal has a fixed period. When the output duty cycle of the PWM signal is 0 or the maximum value, the PWM signal stops outputting normally; the output current signal represents the current in the motor winding. Under the control of the PWM signal, the waveform of the output current signal follows the sine waveform. When the PWM signal stops outputting, the output current signal is 0. When the adjusted PWM signal is output normally, the current signal is output at the same time; when the PWM signal stops outputting, the motor of the inductive fan is still rotating due to inertia, so the terminal voltage signal of the motor will not be 0.

[0052] Specifically, Figure 2 As shown, the duty cycle of the first PWM signal is set to 0 to obtain a continuous low-level output, thereby stopping the normal output of the PWM signal, so that the upper bridge and the lower bridge of the inverter are cut off and the output current signal is further stopped; further, the duty cycle of the second PWM signal is adjusted to keep the PWM signal of the upper bridge of the inverter at a low level and the PWM signal of the lower bridge at a high level, so that the upper bridge of the inverter is cut off and the lower bridge is turned on, so as to provide output current through the induced electromotive force generated by the three-phase port of the motor.

[0053] Specifically, the motor of the sensorless fan suddenly stops inverter output after reaching the target speed in the open-loop dragging stage, and will continue to rotate due to inertia. At this time, the three-phase port of the motor will generate induced electromotive force. Due to the reception of the first PWM signal sent by the controller, the upper bridge arm and the lower bridge arm of the inverter are cut off, and a loop cannot be formed, and the current cannot be detected. After receiving the second PWM signal sent by the controller, the upper bridge arm of the inverter is cut off and the lower bridge arm is turned on. The induced electromotive force will form a loop through the resistance and inductance of the motor of the sensorless fan itself and the current sampling resistor, and the sampling data of the current sampling resistor at this time is collected.

[0054] like Figure 3 As shown, it shows the circuit formed by the motor itself of the inductive fan described in the embodiment of the present application.

[0055] Wherein, 31 represents the motor inductance, 32 represents the motor resistance, and 33 represents the induced electromotive force. When the lower bridge arm of the inverter is turned on, the induced electromotive force 33 forms a closed loop with the motor inductance 31 and the motor resistance 32, and the induced electromotive force 33 provides power.

[0056] In this embodiment, the upper bridge arm of the inverter connected to the motor is turned off, and the lower bridge arm is turned on, and the induced electromotive force forms a loop with the resistance and inductance of the motor itself and the current sampling resistor.

[0057] Step S2: based on the sampled data, respectively obtain the electrical frequency and the terminal voltage of the motor corresponding to the sampled data.

[0058] In this embodiment, the sampling data is the voltage drop across the sampling resistor. Acquiring the terminal voltage of the motor corresponding to the sampling data based on the sampling data includes: calculating the current flowing through the motor based on the voltage drop across the sampling resistor; and calculating the terminal voltage of the motor based on the current flowing through the motor and the motor resistance.

[0059] Specifically, the current flowing through the motor winding is obtained based on Ohm's law according to the voltage drop across the sampling resistor, and the terminal voltage of the motor is calculated according to the phase resistance of the motor winding and the obtained current flowing through the motor winding.

[0060] In this embodiment, the terminal voltage of the motor is calculated using the following formula:

[0061]

[0062] Among them, V phase Represents the terminal voltage of the motor to be solved, V sample Represents the voltage drop across the sampling resistor, R sample Indicates the resistance of the sampling resistor, R phase Indicates the phase resistance of the motor winding.

[0063] In this embodiment, acquiring the electrical frequency corresponding to the sampled data based on the sampled data includes: acquiring the actual rotation speed of the motor based on the acquired terminal voltage of the motor; and calculating the electrical frequency corresponding to the sampled data based on the actual rotation speed of the motor.

[0064] In this embodiment, the following formula is used to calculate and obtain the electrical frequency corresponding to the sampled data:

[0065] E≈V phase

[0066] Among them, f2 represents the electrical frequency corresponding to the sampled data to be solved, P represents the number of pole pairs of the motor, E represents the back electromotive force of the motor, and K e Represents the back electromotive force constant of the motor, Vphase Indicates the terminal voltage of the motor.

[0067] In this embodiment, the back electromotive force E of the motor is estimated by obtaining the voltage drop across the sampling resistor and the phase resistance of the motor, and due to the influence of the resistance and current inside the motor, the value of the back electromotive force E of the motor is approximately equal to the terminal voltage of the motor.

[0068] Step S3: determining whether the inductive fan is blocked according to the electrical frequency corresponding to the sampled data and the terminal voltage of the motor.

[0069] In this embodiment, judging whether the non-inductive fan is stalled based on the electrical frequency corresponding to the sampling data and the terminal voltage of the motor includes: judging whether the difference between the electrical frequency corresponding to the sampling data and the first electrical frequency in the open-loop stage meets a first preset condition, and judging whether the difference between the terminal voltage of the motor and the induced electromotive force of the motor at the target speed meets a second preset condition. If both the first preset condition and the second preset condition are met, the non-inductive fan is stalled.

[0070] In this embodiment, determining whether the difference between the electrical frequency corresponding to the sampled data and the first electrical frequency in the open-loop stage meets the first preset condition includes:

[0071] According to the target speed in the open-loop phase and the number of pole pairs of the motor, the formula is: Calculate and obtain a first electrical frequency f1, where P represents the number of pole pairs of the motor, and n represents the target speed in the open-loop stage;

[0072] It is determined whether the difference between the first electrical frequency f1 and the electrical frequency f2 corresponding to the sampled data is less than a first preset threshold value. If so, the first preset condition is met.

[0073] In this embodiment, determining whether the difference between the terminal voltage of the motor and the induced electromotive force of the motor at the target speed meets the second preset condition includes:

[0074] Get the motor's back electromotive force parameters and target speed through the formula: V e =K e ×n, calculate and obtain the induced electromotive force V of the motor at the target speed e , where K e represents the back electromotive force of the motor, and n represents the target speed of the motor in the open-loop stage;

[0075] Determine the induced electromotive force V of the motor at the target speed e Whether the difference between the terminal voltage of the motor and the terminal voltage of the motor is less than a second preset threshold value, if so, the second preset condition is met.

[0076] See also Figure 4, which is a flow chart of a non-sensing fan stall detection method according to another embodiment of the present application.

[0077] like Figure 4 As shown, when the motor speed of the sensorless fan reaches the target speed in the open-loop stage, the output PWM signal of normal control is stopped, that is, the duty cycle of the PWM signal is controlled to be 0 so that the upper bridge arm and the lower bridge arm of the inverter are turned off to stop the inverter output; then the lower bridge arm of the inverter is controlled to output a fixed duty cycle at the same time and the duty cycle of the upper bridge arm is kept at 0, so that the lower bridge arm of the inverter is turned on and the upper bridge arm is turned off; the induced electromotive force of the motor when the inverter output is stopped, the resistance and inductance of the motor itself, and the current sampling resistor are used to form a loop, and the sampling data at both ends of the current sampling resistor (the voltage drop at both ends of the sampling resistor) are collected, and the voltage drop is processed to obtain the sampling current, the electrical frequency corresponding to the sampling current, and the terminal voltage of the motor; it is judged whether the difference between the electrical frequency in the open-loop stage and the electrical frequency corresponding to the sampling current meets the first preset condition, and it is judged whether the difference between the induced electromotive force of the motor and the terminal voltage of the motor when the inverter output is stopped meets the second preset condition; if both the first preset condition and the second preset condition are met, the sensorless fan is blocked, otherwise, the sensorless fan operates normally.

[0078] The protection scope of the non-sensing fan stall detection method described in the embodiment of the present application is not limited to the execution order of the steps listed in the present embodiment. All solutions implemented by adding, reducing or replacing steps in the prior art based on the principles of the present application are included in the protection scope of the present application.

[0079] See also Figure 5 , which is a schematic diagram of the structure of the non-sensing fan stall detection device according to the embodiment of the present application. Figure 5 As shown, the non-sensing fan stall detection device 500 includes: a collection module 510, a data processing module 520, a judgment module 530 and a control module 540.

[0080] The control module 540 is used to receive the control instruction sent by the controller so as to form a circuit loop inside the inductive fan;

[0081] The acquisition module 510 is used to acquire sampling data of the motor at the target speed during the transition phase;

[0082] The data processing module 520 is used to obtain the electrical frequency and the terminal voltage of the motor corresponding to the sampled data respectively based on the sampled data;

[0083] The judgment module 530 is used to judge whether the inductive fan is blocked according to the electrical frequency corresponding to the sampling data and the terminal voltage of the motor.

[0084] The implementation method of the non-sensing fan stall detection device described in the embodiment of the present application corresponds one to one with the steps of the non-sensing fan stall detection method described in the embodiment of the present application, so it will not be repeated here.

[0085] The sensorless fan stall detection device described in the embodiment of the present application can implement the sensorless fan stall detection method described in the present application, but the implementation device of the sensorless fan stall detection method described in the present application includes but is not limited to the structure of the sensorless fan stall detection device listed in the present embodiment. All structural deformations and replacements of the prior art made according to the principles of the present application are included in the protection scope of the present application.

[0086] In the several embodiments provided in the present application, it should be understood that the disclosed circuits, power supply devices or methods can be implemented in other ways. For example, the power supply device embodiments described above are only schematic, for example, the division of modules / units is only a logical function division, and there may be other division methods in actual implementation, for example, multiple modules or units can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or modules or units, which can be electrical, mechanical or other forms.

[0087] Those of ordinary skill in the art should further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in the above description according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0088] The descriptions of the processes or structures corresponding to the above-mentioned figures have different emphases. For parts that are not described in detail in a certain process or structure, please refer to the relevant descriptions of other processes or structures.

[0089] The above embodiments are merely illustrative of the principles and effects of the present application and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A non-sensing fan stall detection method, characterized in that: The method comprises: Obtain sampling data of the motor during the transition phase; Based on the sampled data, respectively acquiring the electrical frequency and the terminal voltage of the motor corresponding to the sampled data; Whether the inductive fan is blocked is determined according to the electrical frequency corresponding to the sampled data and the terminal voltage of the motor.

2. The non-sensing fan stall detection method according to claim 1, characterized in that: Before acquiring the sampling data of the motor in the transition phase, the method further includes: Receive and execute the control instructions sent by the controller to form a circuit loop inside the sensorless fan.

3. The non-sensing fan stall detection method according to claim 2, characterized in that: Receive and execute the control instructions sent by the controller to form a circuit loop inside the non-inductive fan, including: After the motor reaches the target speed, a PWM control signal sent by the controller is received to turn on the lower bridge of the inverter connected to the sensorless wind turbine and turn off the upper bridge of the inverter.

4. The non-sensing fan stall detection method according to claim 3 is characterized in that: Receiving a PWM control signal sent by a controller to turn on a lower bridge of an inverter connected to a sensorless wind turbine and turn off an upper bridge of the inverter includes: receiving a first PWM signal sent by the controller to turn off the inverter; A second PWM signal sent by the controller is received to turn on the lower bridge of the inverter.

5. The non-sensing fan stall detection method according to claim 2, characterized in that: The sampling data is a voltage drop across the sampling resistor, and obtaining the terminal voltage of the motor based on the sampling data includes: Calculating the current flowing through the motor based on the voltage drop across the sampling resistor; According to the current flowing through the motor and the motor resistance, The terminal voltage to the motor.

6. The non-sensing fan stall detection method according to claim 5, characterized in that: Acquiring an electrical frequency corresponding to the sampled data based on the sampled data includes: Acquire the actual speed of the motor according to the acquired terminal voltage of the motor; The electrical frequency corresponding to the sampled data is calculated based on the actual rotation speed of the motor.

7. The non-sensing fan stall detection method according to claim 1, characterized in that: Judging whether the inductive fan is blocked according to the electrical frequency corresponding to the sampled data and the terminal voltage of the motor includes: Determining whether a difference between the electrical frequency corresponding to the sampled data and the first electrical frequency in the open-loop phase meets a first preset condition; and Determining whether the difference between the terminal voltage of the motor and the induced electromotive force of the motor at the target speed meets a second preset condition; If the first preset condition and the second preset condition are met at the same time, the inductive fan is blocked.

8. The non-sensing fan stall detection method according to claim 7, characterized in that: The first preset condition is: the difference between the electrical frequency corresponding to the sampling data and the first electrical frequency in the open-loop stage is greater than a first threshold; the second preset condition is: the difference between the terminal voltage of the motor and the induced electromotive force of the motor at the target speed is greater than a second threshold.

9. A non-sensing fan stall detection device, characterized in that: The device comprises: a collection module, a data processing module and a judgment module; The acquisition module is used to obtain sampling data of the motor in the transition phase; The data processing module is used to obtain the electrical frequency and the terminal voltage of the motor corresponding to the sampled data respectively based on the sampled data; The judgment module is used to judge whether the inductive fan is blocked according to the electrical frequency corresponding to the sampling data and the terminal voltage of the motor.

10. The non-inductive fan stall detection device according to claim 9, characterized in that: The device also includes: a control module; The control module is used to receive control instructions sent by the controller to form a circuit loop inside the inductive fan.

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