Range hood control method and device and range hood

Abstract

The invention relates to the technical field of range hoods, and discloses a range hood control method and device and a range hood. The method comprises the steps that it is detected that a motor of the range hood meets a first set condition; controlling the motor to enter a motor speed raising control mode; and in the motor speed raising control mode, generating a negative current opposite to the stator current of the motor in direction until the negative current reaches the maximum flux weakening current. Therefore, under the condition that new hardware is not added, the negative current with the direction opposite to that of the stator current of the motor is generated until the negative current reaches the maximum flux-weakening current, so that the purpose of flux-weakening speed increasing is achieved by reducing the exciting current of the rotor of the motor, the limitation of the reverse electromotive force of the motor on the rotating speed of the motor is effectively avoided, and the service life of the motor is prolonged. And the high maximum static pressure air performance index of the direct-current variable-frequency range hood is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and in particular to a range hood control method and device, and a range hood. Background Art

[0002] Range hoods are common household appliances in kitchens. DC variable frequency range hoods are widely used due to their high air performance index, high working efficiency and energy saving, adaptive control of air volume and static pressure, and good oil fume extraction effect. Oil fume extraction effect is one of the main considerations for range hoods, and there are many factors that affect the oil fume extraction effect. For example: With the popularity of high-rise residential buildings, air duct resistance has become the main factor affecting the extraction effect of range hoods. If you want to improve the extraction effect of range hoods under working conditions with large air duct resistance, you need to improve the maximum static pressure air performance index of the DC variable frequency range hood.

[0003] However, in the relevant technical solutions, the maximum static pressure air performance index of most range hoods is relatively low, and it is impossible to achieve a higher maximum static pressure air performance index under working conditions with large air duct resistance, thus affecting the working effect of the range hood. In the design process of some range hoods, a higher maximum static pressure air performance index is achieved by redesigning the whole machine structure and increasing the motor power, but the cost of such design is too high. Therefore, how to design a reasonable and effective solution to improve the maximum static pressure air performance index of the range hood at a relatively reasonable cost to better adapt to the working environment with large air duct resistance has become a technical problem that needs to be solved urgently. Summary of the invention

[0004] In view of this, the present invention provides a range hood control method, device and range hood to solve the problem of how to design a reasonable and effective solution to improve the maximum static pressure air performance index of the range hood at a relatively reasonable cost so as to better adapt to the working environment with large air duct resistance.

[0005] In a first aspect, the present invention provides a control method for a range hood, comprising:

[0006] It is detected that the motor of the range hood meets the first set condition;

[0007] Control the motor to enter the motor speed increase control mode;

[0008] In the motor speed-up control mode, a negative current opposite to the stator current of the motor is generated until the negative current reaches the maximum field weakening current.

[0009] The control method of the range hood provided by the present invention controls the motor to enter the motor speed-up control mode when it is detected that the motor of the range hood meets the first set condition. In the motor speed-up control mode, a negative current opposite to the stator current of the motor is generated until the negative current reaches the maximum weak magnetic current. Thus, without adding new hardware, by generating a negative current opposite to the stator current of the motor until the negative current reaches the maximum weak magnetic current, the purpose of weak magnetic speed-up is achieved by reducing the excitation current of the motor rotor, effectively avoiding the limitation of the motor speed by the reverse electromotive force of the motor, and significantly improving the high maximum static pressure air performance index of the DC variable frequency range hood.

[0010] In an optional implementation, generating a negative current opposite to the stator current of the motor until the negative current reaches a maximum field weakening current includes:

[0011] The negative current is controlled to increase over time to the maximum field weakening current.

[0012] The control method of the range hood provided by the present invention controls the negative current to increase over time to the maximum weak magnetic current, thereby gradually reducing the motor rotor excitation current, effectively avoiding the sudden change of the motor rotor excitation current and the resulting sudden change of the motor speed, and significantly improving the motor operation stability.

[0013] In an optional implementation, the first setting condition includes:

[0014] The motor reaches the maximum rated speed;

[0015] The output voltage amplitude of the motor is greater than the first set amplitude.

[0016] The control method of the range hood provided by the present invention sets the motor reaching the maximum rated speed or the motor output voltage amplitude being greater than the first set amplitude as the first set condition. The specific quantifiable parameter index is used to quickly and accurately determine the condition that the reverse electromotive force of the motor is close to the DC bus voltage in the range hood control system.

[0017] In an optional implementation, after controlling the motor to enter the motor speed increase control mode, the method further includes:

[0018] When it is detected that the output voltage amplitude of the motor is less than the second set amplitude, the motor is controlled to exit the motor speed increase control mode.

[0019] The control method of the range hood provided by the present invention controls the motor to exit the motor speed-up control mode when it is detected that the output voltage amplitude of the motor is less than the second set amplitude. Thus, the situation where the motor works at high power for a long time and causes a relatively high temperature rise is effectively avoided, and the adaptive adjustment control of the range hood under high static pressure conditions is realized.

[0020] In an optional implementation, after controlling the motor to exit the motor speed increase control mode, the method further includes:

[0021] It is detected that the stator current is less than the minimum field weakening current;

[0022] The negative current is controlled to decrease until the negative current reaches the minimum field weakening current.

[0023] The control method of the range hood provided by the present invention controls the motor to exit the motor speed-up control mode, and detects that the stator current is less than the minimum weak magnetic current, and then controls the negative current to decrease until the negative current reaches the minimum weak magnetic current. Thus, the situation where the motor works at high power for a long time and causes a relatively high temperature rise is effectively avoided, and the adaptive adjustment control of the range hood under high static pressure conditions is realized.

[0024] In an optional implementation, controlling the negative current to decrease until the negative current reaches a minimum magnetic weakening current includes:

[0025] The negative current is controlled to decrease to the minimum field weakening current over time.

[0026] The control method of the range hood provided by the present invention controls the negative current to decrease to the minimum weak magnetic current over time, effectively controls the reduction range of the negative current, and avoids problems such as sudden change of the motor speed caused by sudden change of the negative current.

[0027] In an optional implementation, the minimum field weakening current is zero.

[0028] In a third aspect, the present invention provides a control device for a range hood, the device comprising:

[0029] A detection module, used for detecting that the motor of the range hood meets a first set condition;

[0030] A control module, used to control the motor to enter a motor speed increase control mode;

[0031] The first current module is used to generate a weak magnetic current in the opposite direction to the stator current of the motor in the motor speed increase control mode until the weak magnetic current reaches a maximum weak magnetic current.

[0032] In a third aspect, the present invention provides a range hood, comprising:

[0033] A motor connected to a controller;

[0034] The controller includes: a memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the control method of the range hood of the first aspect or any corresponding embodiment thereof by executing the computer instructions to control the motor.

[0035] In an optional embodiment, the range hood further comprises:

[0036] The inverter is connected to the controller and is used for generating a negative current opposite to a stator current of the motor based on the control of the controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0038] Figure 1 is a flow chart of a control method of a range hood according to an embodiment of the present invention;

[0039] Figure 2 is a schematic diagram of a voltage limit ellipse and a current limit circle of a motor according to an embodiment of the present invention;

[0040] Figure 3 is a flow chart of another range hood control method according to an embodiment of the present invention;

[0041] Figure 4 is a structural block diagram of a control device for a range hood according to an embodiment of the present invention;

[0042] Figure 5 is a schematic diagram of the hardware structure of a range hood according to an embodiment of the present invention;

[0043] Figure 6 It is a schematic diagram of the hardware structure of the controller of the range hood according to the embodiment of the present invention. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0045] How to design a reasonable and effective solution to improve the maximum static pressure air performance index of the range hood at a relatively reasonable cost so as to better adapt to the working environment with large air duct resistance has become a technical problem to be solved urgently. The present invention provides a range hood control method, device and range hood to solve the above technical problem.

[0046] The range hood of the embodiment of the present invention can be a DC variable frequency range hood. If it is necessary to improve the high static pressure air performance index of the range hood, the motor speed needs to be able to run at a higher speed under the condition of large air duct resistance, which is essentially achieved through motor speed control. When the motor rotates, a reverse electromotive force will be generated, and the magnitude of the reverse electromotive force is proportional to the motor speed. When the motor speed is increased to a certain extent, the reverse electromotive force of the motor is close to the DC bus voltage in the DC variable frequency range hood control system. At this time, the increase in the current of the motor stator coil is resisted, and the maximum speed of the motor is limited. If it is necessary to further increase the speed of the motor, the purpose of weak magnetic field speed increase can be achieved for the separately excited DC motor by reducing the rotor excitation current. However, the DC variable frequency range hood uses a permanent magnet synchronous motor, and the rotor is a permanent magnet magnetic flux, and the excitation magnetic field cannot be adjusted by the excitation winding. Therefore, for the DC variable frequency range hood, the stator current can only be adjusted to achieve an effect similar to "separately excited DC motors achieve weak magnetic field speed increase by reducing the rotor excitation current".

[0047] The control principles involved in the range hood control method of the embodiment of the present invention include vector control, speed closed-loop control, current closed-loop control and current regulation weak magnetic control. The core is to use the FOC (Field-Oriented Control) vector control method, and the key to FOC control lies in the design and control of the two current regulators of the d-axis and q-axis. Among them, the d-axis and the q-axis are a kind of mathematical geometric coordinate axis. Based on the basic condition that the mathematical coordinates rotate synchronously when the motor rotor rotates, the mathematical model of the motor is converted to the two coordinate axes in this coordinate system under the coordinate system established on the motor rotor. The d-axis refers to the direction of the rotor magnetic field, and the q-axis is the direction perpendicular to the rotor magnetic field.

[0048] According to an embodiment of the present invention, an embodiment of a control method for a range hood is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0049] In this embodiment, a control method for a range hood is provided, which can be used for a range hood. Figure 1 is a flow chart of a control method of a range hood according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0050] Step S101: It is detected that the motor of the range hood meets a first set condition.

[0051] In some optional embodiments of the present invention, the first setting condition is mainly that the motor speed is relatively high, the motor generates a reverse electromotive force, and the reverse electromotive force is close to the DC bus voltage of the range hood. It is not possible to simply increase the motor speed by controlling the motor speed parameter.

[0052] Specifically, when the speed of the range hood motor is low, the reverse electromotive force generated by the motor is small, and the reverse electromotive force is not sufficient to affect the increase in the motor speed. The fan speed can be normally increased by increasing the stator coil current.

[0053] like Figure 2 In the schematic diagram of the voltage limit ellipse and current limit circle of the motor shown, when the motor speed is low, the working point of the motor is located at point B where the current limit circle and the voltage limit ellipse intersect, and at this time the motor has a maximum torque output.

[0054] In an optional implementation, the first set condition includes that the motor reaches a maximum rated speed and the output voltage amplitude of the motor is greater than a first set amplitude.

[0055] In some optional embodiments of the present invention, under the working condition that the air duct resistance of the range hood is large, the speed of the motor gradually increases and reaches the maximum rated speed. At this time, the voltage amplitude Uq output by the current regulator of the range hood can be detected at each set time interval, and the magnitude relationship between the real-time detected voltage amplitude Uq and the first set amplitude Uq1 can be determined. The first set amplitude Uq1 is determined based on the DC side bus voltage of the motor of the range hood. The maximum rated speed of the motor is a fixed parameter of the motor.

[0056] The control method of the range hood provided by the present invention sets the motor reaching the maximum rated speed or the motor output voltage amplitude being greater than the first set amplitude as the first set condition. The specific quantifiable parameter index is used to quickly and accurately determine the condition that the reverse electromotive force of the motor is close to the DC bus voltage in the range hood control system.

[0057] Step S102, controlling the motor to enter a motor speed increase control mode.

[0058] If the motor speed reaches the maximum rated speed and the motor output voltage amplitude is greater than the first set amplitude, it is determined that the motor of the range hood meets the first set condition. At this time, the fan speed cannot be increased by increasing the stator coil current, so it is necessary to trigger the motor speed increase control mode and trigger the current adjustment weak magnetic control operation to meet the improvement of the range hood's high static pressure air performance indicators.

[0059] In some optional implementations of the present invention, the voltage constraint of the motor operation refers to the maximum voltage constraint that the inverter of the range hood can output, and the maximum voltage amplitude can be used as the first set amplitude.

[0060] Specifically, after the motor enters the speed increase control process, the current id can be gradually increased in a negative direction opposite to the stator current direction of the motor with the current standard value unit as the amplitude, so that the motor speed is gradually increased.

[0061] Step S103, in the motor speed-up control mode, a negative current opposite to the stator current of the motor is generated until the negative current reaches the maximum field weakening current.

[0062] In an optional implementation, step S103 may be implemented by the following operation: controlling the negative current to increase over time to a maximum magnetic weakening current.

[0063] For example, return to reference Figure 2 , as the speed of the motor increases, the voltage limit ellipse shrinks toward the center of the ellipse, and the motor working point moves to the left along the current limit circle as the speed increases to maintain the maximum possible torque output. Specifically, the motor working point moves from B to working point C and returns to the voltage ellipse ring to complete the increase in motor speed and stable operation. Thus, by generating a negative current in the opposite direction to the stator current of the motor, the motor speed is increased to achieve a better oil fume extraction effect and improve the air performance index value of the range hood. However, in order to ensure the normal operation of the motor and avoid problems such as excessive motor speed and excessive motor temperature rise, it is necessary to set the maximum weak magnetic current Imax of the motor here, and the value of the negative current generated in the opposite direction to the stator current of the motor does not exceed the maximum weak magnetic current Imax.

[0064] In some optional embodiments of the present invention, the current constraint of the motor operation mainly depends on the output current of the inverter of the range hood and the maximum current that the stator winding of the motor can withstand. The smaller current value of these two values ​​can be used as the maximum weak magnetic current.

[0065] The control method of the range hood provided by the present invention controls the motor to enter the motor speed-up control mode when it is detected that the motor of the range hood meets the first set condition. In the motor speed-up control mode, a negative current opposite to the direction of the stator current of the motor is generated until the negative current reaches the maximum weak magnetic current. Thus, without adding new hardware, by generating a negative current opposite to the direction of the stator current of the motor until the negative current reaches the maximum weak magnetic current, the purpose of weak magnetic speed-up is achieved by reducing the motor rotor excitation current, effectively avoiding the limitation of the motor speed by the reverse electromotive force of the motor, and significantly improving the high maximum static pressure air performance index of the DC variable frequency range hood. And the negative current is controlled to increase to the maximum weak magnetic current over time, thereby gradually reducing the motor rotor excitation current, effectively avoiding the sudden change of the motor rotor excitation current and the resulting sudden change of the motor speed, and significantly improving the motor operation stability.

[0066] In this embodiment, a control method for a range hood is provided, which can be used for a range hood. Figure 3 is a flow chart of a control method of a range hood according to an embodiment of the present invention. Figure 3 As shown, the process includes the following steps:

[0067] Step S301: It is detected that the motor of the range hood meets a first set condition.

[0068] For details, please see Figure 1 Step S101 of the illustrated embodiment will not be described in detail here.

[0069] Step S302, controlling the motor to enter a motor speed increase control mode.

[0070] For details, please see Figure 1 Step S102 of the illustrated embodiment will not be described in detail here.

[0071] Step S303, in the motor speed-up control mode, a negative current opposite to the stator current of the motor is generated until the negative current reaches the maximum field weakening current.

[0072] For details, please see Figure 1 Step S103 of the illustrated embodiment will not be described in detail here.

[0073] Step S304, when it is detected that the output voltage amplitude of the motor is less than the second set amplitude, the motor is controlled to exit the motor speed increase control mode.

[0074] When it is detected that the output voltage amplitude of the motor is less than the second set amplitude, it means that the range hood air duct resistance working condition is normal and there is no large resistance. At this time, there is no need to speed up the motor, and the motor can be controlled to exit the motor speed-up control mode, effectively avoiding the situation where the motor works at high power for a long time and causes a high temperature rise. The second set amplitude can be equal to the first set amplitude, or can be set according to actual conditions.

[0075] The control method of the range hood provided by the present invention controls the motor to exit the motor speed-up control mode when it is detected that the output voltage amplitude of the motor is less than the second set amplitude. Thus, the situation where the motor works at high power for a long time and causes a relatively high temperature rise is effectively avoided, and the adaptive adjustment control of the range hood under high static pressure conditions is realized.

[0076] Step S305: Detect that the stator current is less than the minimum field weakening current.

[0077] In some optional embodiments of the present invention, again refer to Figure 2After the motor exits the motor speed increase control mode, the motor operating point will move to the right. For example, it can move from operating point C to operating point B. The motor maintains the speed of the adaptive working condition to avoid the motor working at high power for a long time, resulting in a relatively high temperature rise, and realize the adaptive adjustment control method of high static pressure of DC variable frequency range hood.

[0078] Step S306, controlling the negative current to decrease until the negative current reaches the minimum magnetic weakening current.

[0079] Specifically, the above step S306 includes: controlling the negative current to decrease to the minimum field weakening current over time. For example, when the working point of the motor moves from working point C to working point B, the negative current in the opposite direction to the stator current of the motor gradually decreases until it is detected that the stator current is less than the minimum field weakening current.

[0080] In some optional embodiments of the present invention, the minimum field weakening current is zero, that is, there is no field weakening.

[0081] The control method of the range hood provided by the present invention, after controlling the motor to exit the motor speed-up control mode, detects that the stator current is less than the minimum weak magnetic current, and then controls the negative current to decrease until the negative current reaches the minimum weak magnetic current. In this way, the situation where the motor works at high power for a long time and causes a relatively high temperature rise is effectively avoided, and the adaptive adjustment control of the range hood under high static pressure conditions is realized. And the negative current is controlled to decrease to the minimum weak magnetic current over time. The reduction range of the negative current is effectively controlled to avoid problems such as sudden changes in motor speed caused by sudden changes in negative current.

[0082] In this embodiment, a control device for a range hood is also provided, which is used to implement the above embodiments and preferred implementations, and the descriptions that have been made will not be repeated. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0083] This embodiment provides a control device for a range hood, such as Figure 4 As shown, including:

[0084] A detection module 401 is used to detect that the motor of the range hood meets a first set condition;

[0085] The control module 402 is used to control the motor to enter a motor speed increase control mode;

[0086] The first current module 403 is used to generate a weak magnetic current in the opposite direction to the stator current of the motor in the motor speed increase control mode until the weak magnetic current reaches the maximum weak magnetic current.

[0087] In an optional implementation, the first current module 403 includes:

[0088] The reverse increasing unit is used to control the negative current to increase to the maximum weak magnetic current over time.

[0089] In an optional implementation, the first setting condition includes:

[0090] The motor reaches the maximum rated speed;

[0091] The output voltage amplitude of the motor is greater than the first set amplitude.

[0092] In an optional embodiment, the device further comprises:

[0093] The exit module is used to control the motor to exit the motor speed increase control mode when it is detected that the output voltage amplitude of the motor is less than the second set amplitude after the motor is controlled to enter the motor speed increase control mode.

[0094] In an optional embodiment, the device further comprises:

[0095] A detection module, used for detecting that the stator current is less than the minimum field weakening current after the motor is controlled to exit the motor speed increase control mode;

[0096] The second current module is used to control the negative current to decrease until the negative current reaches the minimum magnetic weakening current.

[0097] In an optional implementation, the second current module includes:

[0098] The reverse reduction unit is used to control the negative current to decrease to the minimum weak magnetic current over time.

[0099] In an optional implementation, the minimum field weakening current is zero.

[0100] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0101] The control device of the range hood in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0102] The embodiment of the present invention further provides a range hood, such as Figure 5 As shown, the range hood comprises:

[0103] The motor 501 is connected to the controller 502;

[0104] The controller 502 includes: a memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the control method of the range hood of the first aspect or any corresponding embodiment thereof by executing the computer instructions to control the motor.

[0105] In an optional embodiment, the range hood further comprises:

[0106] The inverter 503 is connected to the controller 502 , and is used to generate a negative current opposite to the stator current of the motor based on the control of the controller 502 .

[0107] Figure 6 is a schematic diagram of the structure of a controller provided by an optional embodiment of the present invention, such as Figure 6 As shown, the controller includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. The various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process instructions executed in the controller, including instructions stored in or on the memory to display graphical information of the GUI on an external input / output device (such as a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple controllers can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 6 A processor 10 is taken as an example.

[0108] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0109] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0110] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required by at least one function; the data storage area may store data created according to the use of the controller, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the controller via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0111] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0112] The controller also includes an input device 30 and an output device 40. The processor 10, the memory 20, the input device 30 and the output device 40 may be connected via a bus or other means. Figure 6 The example of connecting through bus is taken in the following.

[0113] The input device 30 can receive input digital or character information, and generate key signal input related to the user settings and function control of the controller 602, such as a touch screen, a keypad, a mouse, a track pad, a touch pad, an indicator bar, one or more mouse buttons, a trackball, a joystick, etc. The output device 40 may include a display device, an auxiliary lighting device (e.g., an LED) and a tactile feedback device (e.g., a vibration motor), etc. The above-mentioned display device includes but is not limited to a liquid crystal display, a light emitting diode, a display and a plasma display. In some optional embodiments, the display device can be a touch screen.

[0114] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0115] A part of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the existence of the computer program instruction in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc., and accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium accessible to the computer.

[0116] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A control method for a range hood, characterized in that: The method comprises: Detecting that the motor of the range hood meets a first set condition; Controlling the motor to enter a motor speed increase control mode; In the motor speed-up control mode, a negative current is generated in a direction opposite to the stator current of the motor until the negative current reaches a maximum field weakening current.

2. The method according to claim 1, characterized in that The generating of a negative current opposite to the stator current of the motor until the negative current reaches a maximum magnetic weakening current includes: The negative current is controlled to increase over time to the maximum magnetic weakening current.

3. The method according to claim 1, characterized in that The first setting condition includes: The motor reaches the maximum rated speed; The output voltage amplitude of the motor is greater than the first set amplitude.

4. The method according to claim 1, characterized in that After controlling the motor to enter the motor speed increase control mode, the method further includes: When it is detected that the output voltage amplitude of the motor is less than the second set amplitude, the motor is controlled to exit the motor speed increase control mode.

5. The method according to claim 4, characterized in that After controlling the motor to exit the motor speed increase control mode, the method further includes: It is detected that the stator current is less than the minimum field weakening current; The negative current is controlled to decrease until the negative current reaches a minimum magnetic weakening current.

6. The method according to claim 5, characterized in that The controlling the negative current to decrease until the negative current reaches a minimum magnetic weakening current includes: The negative current is controlled to decrease to the minimum field weakening current over time.

7. The method according to claim 5 or 6, characterized in that: The minimum field weakening current is zero.

8. A control device for a range hood, characterized in that: The device comprises: A detection module, used for detecting that the motor of the range hood meets a first set condition; A control module, used for controlling the motor to enter a motor speed increase control mode; The first current module is used to generate a weak magnetic current in the opposite direction to the stator current of the motor in the motor speed-up control mode until the weak magnetic current reaches a maximum weak magnetic current.

9. A range hood, characterized in that: include: A motor connected to a controller; The controller includes: a memory and a processor, the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the control method of the range hood according to any one of claims 1 to 8 to control the motor by executing the computer instructions.

10. The range hood according to claim 9, characterized in that: The range hood further comprises: The inverter is connected to the controller and is used to generate a negative current opposite to the stator current of the motor based on the control of the controller.

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