Motor noise reduction method, noise reduction method of clothes treatment equipment and clothes treatment equipment

Abstract

The embodiment of the invention discloses a motor noise reduction method, a noise reduction method of clothes treatment equipment and the clothes treatment equipment, and belongs to the field of noise reduction. The motor noise reduction method comprises the step of selectively adopting a voltage compensation mode or a variable carrier frequency modulation mode to adjust a pulse signal of an inverter under the condition that the speed intervals where the running speed of a motor is located are different. According to the embodiment of the invention, when the motor is subjected to noise reduction, the operation speeds in different speed intervals adopt different modes to realize noise reduction. Wherein the noise reduction mode comprises voltage compensation and variable carrier frequency modulation. When noise reduction is realized by adopting a voltage compensation mode, the noise generated by a dead zone effect can be reduced; when a variable carrier frequency modulation mode is adopted to realize noise reduction, the harmonic current peak can be weakened, and the noise of the motor can be reduced. As different noise reduction modes are adopted for noise reduction according to different use conditions of the motor, the technical effect of noise reduction effect is improved.

Description

Technical Field

[0001] The present application relates to the field of noise reduction, and in particular, to a motor noise reduction method, a noise reduction method for a clothing processing device, and a clothing processing device. Background Art

[0002] Motors are one of the most commonly used driving devices. During the use of motors, noise is generated. Different fields have different tolerance levels for motor noise. For example, in the field of home appliances, the noise generated by motors in home appliances needs to be strictly controlled, otherwise it will greatly reduce the user experience of home appliances.

[0003] Current methods of reducing motor noise include adding shock-absorbing structures or sound-isolating structures, or reducing the noise generated by harmonic energy by reducing the current harmonics of the motor. The above noise reduction methods fail to fully consider the usage of the motor, resulting in poor noise reduction effects when the usage of the motor changes. Summary of the invention

[0004] The embodiments of the present application provide a motor noise reduction method, a noise reduction method for a clothing processing device, and a clothing processing device, so as to at least solve the technical problem of poor noise reduction effect.

[0005] According to a first aspect of an embodiment of the present application, a method for reducing noise of a motor is provided, the method comprising:

[0006] When the speed ranges of the motor are different, voltage compensation or variable carrier frequency modulation is selectively used to adjust the pulse signal of the inverter, wherein the inverter is electrically connected to each phase of the motor and is used to control the voltage and / or current of each phase of the motor based on the pulse signal, wherein the maximum speed value of the speed range corresponding to the voltage compensation does not exceed the minimum speed value of the speed range corresponding to the variable carrier frequency modulation.

[0007] When the noise of the motor is reduced by adopting this embodiment, different noise reduction methods are used for the running speeds in different speed ranges. Among them, the noise reduction methods include voltage compensation and variable carrier frequency modulation. When the noise reduction is achieved by voltage compensation, it helps to reduce the noise generated by the dead zone effect; when the noise reduction is achieved by variable carrier frequency modulation, it helps to weaken the harmonic current spikes and reduce the motor noise. Since different noise reduction methods are used for noise reduction according to different usage conditions of the motor, the noise reduction effect is improved.

[0008] In combination with the first aspect, in an optional implementation of the embodiment of the present application, the pulse signal includes a first pulse signal before adjustment and a second pulse signal after adjustment;

[0009] The pulse signal of the inverter is adjusted by voltage compensation, including:

[0010] Determining a target voltage value of each phase of the motor after compensation according to the voltage compensation value of each phase of the motor, the phase current direction of each phase of the motor and the phase voltage of each phase of the motor;

[0011] Obtaining a target duty cycle according to the target voltage value of each phase of the motor and a basic voltage vector of the inverter;

[0012] The second pulse signal is obtained based on the first pulse signal and the target duty cycle.

[0013] With this implementation, the compensated target voltage value is first calculated, and then the target duty cycle is calculated based on the target voltage value and the basic voltage vector of the inverter, and finally the second pulse signal is obtained based on the first pulse signal and the target duty cycle. In other words, the process of adjusting the pulse signal is actually to change the duty cycle of the pulse signal. When the duty cycle of the pulse signal changes, it helps to compensate for the dead zone error caused by the dead zone of the pulse signal, thereby reducing the zero current clamping phenomenon and current harmonics, and simultaneously reducing current distortion and output torque fluctuations, thereby reducing the running noise of the motor.

[0014] In combination with the first aspect, in an optional implementation of the embodiment of the present application, determining the target voltage value of each phase of the motor after compensation according to the voltage compensation value of each phase of the motor, the phase current direction of each phase of the motor and the phase voltage of each phase of the motor includes:

[0015] Determining a phase voltage compensation direction of each phase of the motor according to a phase current direction of each phase of the motor;

[0016] The target voltage value of each phase of the motor is calculated according to the phase voltage of each phase of the motor, the phase voltage compensation direction of each phase of the motor and the voltage compensation value, wherein the voltage compensation value is obtained by the dead zone error voltage in the pulse signal.

[0017] By adopting this implementation method, the phase voltage compensation direction is determined according to the phase current direction, and then the target voltage value of each phase after compensation is calculated, that is, the voltage value of each phase after compensation. The calculation is performed step by step and the number of parameters used in the calculation is small, which helps to reduce the calculation difficulty and improve the calculation efficiency.

[0018] In combination with the first aspect, in an optional implementation of the embodiment of the present application, obtaining the target duty cycle according to the target voltage value of each phase of the motor and the basic voltage vector of the inverter includes:

[0019] Combining the target voltage values ​​of each phase of the motor into a space vector voltage;

[0020] The target duty cycle of each switch element of the inverter is obtained by calculating the angle between the space vector voltage and the basic voltage vector.

[0021] In this implementation, the process of adjusting the pulse signal is to first calculate the space vector voltage, and then calculate the target duty cycle of the pulse signal after adjustment according to the angle between the space vector voltage and the basic voltage vector, so as to adjust the pulse signal. Since the duty cycle of the pulse signal is adjusted instead of directly injecting voltage into each phase of the motor, it helps to improve the stability of the voltage of each phase of the motor, thereby steadily reducing the motor noise.

[0022] In combination with the first aspect, in an optional implementation of the embodiment of the present application, a pulse signal of the inverter is adjusted by variable carrier frequency modulation, including:

[0023] In each modulation cycle of the pulse signal, a target carrier frequency is randomly selected from a preset carrier frequency interval for modulation.

[0024] By adopting this implementation method, the target carrier frequency is adjusted for each modulation cycle, so that the target carrier frequency used by the inverter is always changing during the operation of the motor, so that the energy peak generated during the operation of the inverter can be dispersed. The dispersed harmonic energy reduces the current harmonic amplitude of the carrier frequency and its multiple frequencies, weakens the harmonic current spikes, and achieves the purpose of reducing motor noise.

[0025] In combination with the first aspect, in an optional implementation method of the embodiment of the present application, in the process of adjusting the pulse signal of the inverter used to drive the motor by adopting voltage compensation or variable carrier frequency modulation, the pulse signal is adjusted in combination with the collected noise data.

[0026] When adopting this implementation method, the noise of the motor will also be collected when adjusting the pulse signal to obtain noise data. Since the noise data is the noise actually generated by the motor, it is easy to know the noise reduction effect of the voltage compensation method or the variable carrier frequency modulation method through the noise data, which helps to select the voltage compensation method or variable carrier frequency modulation method with the best noise reduction effect, and also helps to change the adjustment direction of the pulse signal when the noise increases, thereby improving the reliability of noise reduction.

[0027] In combination with the first aspect, in an optional implementation of the embodiment of the present application, the noise data includes first noise data and second noise data;

[0028] The method further comprises:

[0029] If the voltage compensation method is used to adjust the pulse signal, first noise data is collected during the adjustment process and the timing for adjusting the pulse signal is selected according to the noise change trend represented by the first noise data; and / or,

[0030] If the pulse signal is adjusted by the variable carrier frequency modulation method, second noise data is collected during the adjustment process and a carrier frequency value interval of a target carrier frequency is selected according to the second noise data, so as to modulate the pulse signal using the target carrier frequency.

[0031] By adopting this implementation method, noise data is used to select the time to adjust the pulse signal. This helps to avoid the problem of not being able to correctly compensate for the dead-zone voltage near the zero point of the motor current or even obtaining a reverse effect that causes increased noise when adjusting the pulse signal using voltage compensation. The dead-zone voltage compensation is performed more accurately, avoiding incorrect compensation at the zero point of the motor current, and improving the noise reduction effect.

[0032] For the variable carrier frequency modulation method, the carrier frequency value interval of the target carrier frequency is selected according to the second noise data, so that the selected carrier frequency value interval can make the motor generate the minimum noise, thereby improving the noise reduction effect.

[0033] In combination with the first aspect, in an optional implementation of the embodiment of the present application, if the pulse signal is adjusted by the voltage compensation method, first noise data is collected during the adjustment process and a timing for adjusting the pulse signal is selected according to a noise change trend represented by the first noise data, including:

[0034] Acquiring the current value of the motor during the pulse signal adjustment process;

[0035] If the current value is within the preset current buffer zone, collecting the first noise data and determining whether the noise change trend represented by the first noise data is increasing;

[0036] If so, stop adjusting the pulse signal and adjust the pulse signal when the current value is outside the current buffer zone.

[0037] When using this implementation method, the current value of the motor is first obtained. According to the current value, the current buffer zone where the current passes through zero can be known. Then, the first noise data in the current buffer zone is collected. If the noise change trend is increasing, it indicates that the dead zone voltage cannot be correctly compensated at the corresponding timing in the current buffer zone. At this time, the pulse signal adjustment is stopped to avoid incorrect compensation at the zero point of the motor current, thereby improving the noise reduction effect.

[0038] In combination with the first aspect, in an optional implementation of the embodiment of the present application, if the pulse signal is adjusted by the variable carrier frequency modulation method, second noise data is collected during the adjustment process and a carrier frequency value interval of a target carrier frequency is selected according to the second noise data, so as to modulate the pulse signal using the target carrier frequency, including:

[0039] The pulse signal is subjected to the variable carrier frequency modulation based on each of the preset multiple carrier frequency value intervals, and noise data is collected during the variable carrier frequency modulation process to obtain the second noise data corresponding to each of the carrier frequency value intervals; the duration of the variable carrier frequency modulation corresponding to each of the carrier frequency value intervals is the same and the duration is not less than a preset duration threshold;

[0040] The carrier frequency value interval corresponding to the second noise data representing the minimum noise is used as the carrier frequency value interval for selecting the target carrier frequency, so as to modulate the pulse signal using the target carrier frequency.

[0041] By adopting this implementation method, a carrier frequency value interval with the minimum noise is first determined based on the second noise data, and then the target carrier frequency is selected from the carrier frequency value interval to modulate the pulse signal by using variable carrier frequency modulation, which helps to improve the noise reduction effect.

[0042] In combination with the first aspect, in an optional implementation of the embodiment of the present application, before selectively adjusting the pulse signal of the inverter by voltage compensation or variable carrier frequency modulation when the speed intervals of the running speed of the motor are different, the method further includes:

[0043] The running speed of the motor is obtained or the motor running mode of the motor is obtained, wherein the running speed of the motor or the speed range corresponding to the motor can be determined according to the motor running mode.

[0044] By adopting this implementation, the running speed of the motor can be obtained first, and then the speed interval can be determined according to the running speed. Alternatively, the motor running mode of the motor can be obtained first, and then the running speed or speed interval of the motor can be determined according to the motor running mode. That is, multiple ways of determining the speed interval are provided, making the process of determining the speed interval corresponding to the motor more flexible and convenient.

[0045] According to a second aspect of an embodiment of the present application, a noise reduction method for a clothes processing device is provided, the method comprising:

[0046] Acquiring an equipment operation mode of the clothes processing equipment or an operation speed of a motor of the clothes processing equipment, wherein, under different equipment operation modes, the motor corresponds to different operation speeds, different motor operation modes or different speed ranges; wherein, according to the motor operation mode, the operation speed of the motor or the speed range corresponding to the motor can be determined; wherein, the motor includes a motor for driving a processing drum of the clothes processing equipment to rotate;

[0047] The motor noise reduction method described above is used to reduce noise.

[0048] With this embodiment, different equipment operation modes have different operating speed requirements for the motor, so the operating speed of the motor can be determined according to the equipment operation mode, and then the pulse signal can be adjusted by voltage compensation or variable carrier frequency modulation according to the equipment operation mode, so that the noise of the motor is reduced. Since different equipment operation modes use different noise reduction methods, this application can use different noise reduction methods according to the operation conditions of the motor, which helps to improve the noise reduction effect.

[0049] In combination with the second aspect, in an optional implementation of the embodiment of the present application, the device operation mode includes a first operation mode and a second operation mode, and the operation speed of the motor corresponding to the first operation mode is less than the operation speed of the motor corresponding to the second operation mode;

[0050] If the device operation mode is the first operation mode, adjusting the pulse signal by means of voltage compensation;

[0051] If the device operation mode is the second operation mode, the pulse signal is adjusted by variable carrier frequency modulation.

[0052] By adopting this implementation method, for the first operating mode in which the motor runs at a lower speed, the pulse signal is adjusted by voltage compensation, which helps to reduce the noise caused by the dead zone effect of the motor in the low operating speed state; for the second operating mode in which the motor runs at a higher speed, the pulse signal is adjusted by variable carrier frequency modulation, which helps to solve the problem of a large proportion of noise generated by fixed harmonic peaks caused by fixed carrier frequency debugging, thereby achieving noise reduction of the motor.

[0053] In combination with the second aspect, in an optional implementation of the embodiment of the present application, the first operating mode includes a washing mode, and the second operating mode includes a dehydration mode.

[0054] In combination with the second aspect, in an optional implementation of the embodiment of the present application, the device operation mode includes at least one operation stage, and the motor has different speed ranges corresponding to different operation stages.

[0055] With this implementation, the motor speed may change in the same device operation mode. For example, in the washing mode, the motor speed may first change from low to high, maintain for a period of time, and then change from high to low and continue for a period of time. Therefore, the motor speed may switch between multiple speed ranges. By limiting the operation stage, different noise reduction methods can be used in different operation stages under the same device operation mode, which helps to improve the noise reduction effect.

[0056] According to a third aspect of an embodiment of the present application, a clothing processing device is provided, comprising a processing drum and a motor for driving the processing drum to rotate, the clothing processing device adopts the above-mentioned motor noise reduction method for noise reduction or adopts the above-mentioned clothing processing device noise reduction method for noise reduction.

[0057] The technical effect obtained by the third aspect mentioned above is similar to the technical effect obtained by the corresponding technical means in the first and second aspects, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 is a flow chart of a motor noise reduction method provided in an embodiment of the present application;

[0059] Figure 2 This is a flow chart of adjusting a pulse signal in a motor noise reduction method provided in an embodiment of the present application;

[0060] Figure 3 It is a structural schematic diagram of an inverter for controlling a motor in a motor noise reduction method provided in an embodiment of the present application;

[0061] Figure 4 It is a schematic diagram of a pulse signal for controlling an inverter of a motor in a motor noise reduction method provided in an embodiment of the present application;

[0062] Figure 5 is a flow chart of a noise reduction method for a clothing processing device provided in an embodiment of the present application;

[0063] Figure 6 is a schematic diagram of random carrier frequencies provided in an embodiment of the present application;

[0064] Figure 7 is the control signal of the fixed carrier frequency switch tube provided in the embodiment of the present application;

[0065] Figure 8 is the control signal of the random carrier frequency switch tube provided in the embodiment of the present application;

[0066] Fig. 9 This is a flow chart of washing machine noise reduction provided in an embodiment of the present application. DETAILED DESCRIPTION

[0067] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0068] It should be understood that the "plurality" mentioned in this article refers to two or more. In the description of the embodiments of the present application, unless otherwise specified, " / " means or, for example, A / B can mean A or B; "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in order to facilitate the clear description of the technical solutions of the embodiments of the present application, in the embodiments of the present application, the words "first", "second" and so on are used to distinguish between the same items or similar items with basically the same functions and effects. Those skilled in the art can understand that the words "first", "second" and so on do not limit the quantity and execution order, and the words "first", "second" and so on do not limit certain different

[0069] In addition, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or apparatus that includes a series of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, product, or apparatus.

[0070] Motors are one of the most commonly used driving devices. During the use of motors, noise is generated. Different fields have different tolerance levels for motor noise. For example, in the field of home appliances, the noise generated by motors in home appliances needs to be strictly controlled, otherwise it will greatly reduce the user experience of home appliances.

[0071] Current methods of reducing motor noise include adding shock-absorbing structures or sound-isolating structures, or reducing the noise generated by harmonic energy by reducing the current harmonics of the motor. The above noise reduction methods fail to fully consider the usage of the motor, resulting in poor noise reduction effects when the usage of the motor changes.

[0072] Based on this, the present application embodiment provides a motor noise reduction method, referring to Figure 1 The flowchart of the motor noise reduction method shown is as follows, and the method includes the following processing procedures.

[0073] S100 . When the speed ranges of the motor are different, selectively use voltage compensation or variable carrier frequency modulation to adjust the pulse signal of the inverter.

[0074] The running speed refers to the rotation speed of the motor during operation, and specifically can be the rotation speed of the motor shaft during operation. The acquisition method can be to monitor using an angular velocity sensor or a sensing device capable of detecting the running speed of the motor, or to calculate the running speed of the motor based on the input current and / or input voltage of the motor, which is not specifically limited in this embodiment.

[0075] Among them, the inverter is electrically connected to each phase of the motor, and is used to control the voltage and / or current of each phase of the motor based on a pulse signal, wherein the maximum speed value of the speed interval corresponding to the voltage compensation does not exceed the minimum speed value of the speed interval corresponding to the variable carrier frequency modulation.

[0076] It should be noted that at least one speed interval is preset, and different speed intervals correspond to different speed ranges, that is, the speed intervals do not overlap. The number of speed intervals and the range of each speed interval can be set according to actual needs, and this embodiment does not specifically limit this.

[0077] The voltage compensation method refers to changing the phase voltage of the motor by adjusting the pulse signal so that the phase voltage of the motor is compensated accordingly, thereby reducing the noise of the motor.

[0078] The variable carrier frequency modulation method refers to adjusting the inverter's control over the motor by changing the carrier frequency of the pulse signal, thereby reducing the noise of the motor.

[0079] To facilitate understanding, the principle of motor noise generation and noise reduction is briefly explained as follows:

[0080] The motor includes multiple phases, usually three phases. Each phase of the motor is electrically connected to a branch in the inverter (such as Figure 3 As shown in the figure, there are two switch elements (such as MOS tubes or single-pole single-throw switches) in the branch where the inverter and each phase of the motor are electrically connected. In order to avoid the two switch elements on the same branch from being turned on at the same time, a dead zone is set for the pulse signal of the inverter, so that the rising edge of the switch element is delayed for a period of time. However, the setting of the dead zone will bring about a dead zone effect, that is, a fixed dead zone error voltage will appear. The phase voltage with the dead zone error voltage will bring zero current clamping phenomenon and current harmonics to the stator current, causing current distortion, resulting in fluctuations in the output torque of the motor, thereby causing the motor to generate noise.

[0081] The pulse signal of the traditional inverter adopts fixed carrier frequency modulation, which means that the carrier frequency of the pulse signal does not change. This fixed carrier frequency will cause the current to contain harmonic energy concentrated at the switching frequency and its integer multiple frequencies. The concentrated harmonic energy will cause the motor to generate noise.

[0082] Therefore, voltage compensation helps to compensate for the dead zone error voltage, thereby reducing the noise generated by the motor, and variable carrier frequency modulation can change the carrier frequency, thereby reducing the noise generated by the motor.

[0083] When the noise of the motor is reduced by adopting this embodiment, different noise reduction methods are used for the running speeds in different speed ranges. Among them, the noise reduction methods include voltage compensation and variable carrier frequency modulation. When the noise reduction is achieved by voltage compensation, it helps to reduce the noise generated by the dead zone effect; when the noise reduction is achieved by variable carrier frequency modulation, it helps to weaken the harmonic current spikes and reduce the motor noise. Since different noise reduction methods are used for noise reduction according to different usage conditions of the motor, the noise reduction effect is improved.

[0084] In a possible embodiment of the present application, Figure 2 As shown, the pulse signal includes a first pulse signal before adjustment and a second pulse signal after adjustment.

[0085] It should be noted that the pulse signal is a signal that is continuously generated and used, that is, as time goes by, the pulse signal generated before the current time node is a used signal and cannot be changed. The adjustment of the pulse signal in this embodiment refers to adjusting the parameters used to generate the pulse signal, for example, by adjusting the duty cycle so that the duty cycle of the newly generated pulse signal changes. Based on this, the first pulse signal refers to a pulse signal generated before the parameters for generating the pulse signal are adjusted, and the second pulse signal refers to a pulse signal generated after the parameters for generating the pulse signal are adjusted.

[0086] The pulse signal of the inverter is adjusted by voltage compensation, including:

[0087] S200, determining a target voltage value of each phase of the motor after compensation according to the voltage compensation value of each phase of the motor, the phase current direction of each phase of the motor and the phase voltage of each phase of the motor.

[0088] After the pulse signal is determined, information related to the dead zone can be determined, such as the dead zone time. Based on this, the voltage compensation value can be calculated. Specifically, in one embodiment, the method for calculating the voltage compensation value includes:

[0089] Calculate the dead zone error voltage according to the bus voltage, the dead zone time and the period of the pulse signal;

[0090] The formula is: Udb=Udc*Td / Ts, where Udc is the bus voltage, which can be obtained by setting a sampling circuit on the bus; Td is the pre-set dead time, the size of the dead time is related to the turn-off time of the switch, and Ts is the period of the pulse signal.

[0091] The dead zone error voltage is used as a voltage compensation value.

[0092] That is, the calculated dead zone error voltage is the voltage compensation value.

[0093] S202: Obtain a target duty cycle according to a target voltage value of each phase of the motor and a basic voltage vector of the inverter.

[0094] Among them, the basic voltage vector is the basic parameter of the inverter and will not be described in detail.

[0095] S204. Obtain a second pulse signal based on the first pulse signal and the target duty cycle.

[0096] That is to say, the duty cycle of the first pulse signal is changed to the target duty cycle, and the pulse signal generated thereafter is the second pulse signal.

[0097] With this embodiment, the target voltage value after compensation is first calculated, and then the target duty cycle is calculated based on the target voltage value and the basic voltage vector of the inverter, and finally the second pulse signal is obtained based on the first pulse signal and the target duty cycle. In other words, the process of adjusting the pulse signal is actually to change the duty cycle of the pulse signal. When the duty cycle of the pulse signal changes, it helps to compensate for the dead zone error caused by the dead zone of the pulse signal, thereby reducing the zero current clamping phenomenon and current harmonics, and simultaneously reducing current distortion and output torque fluctuations, thereby reducing the operating noise of the motor.

[0098] Optionally, in an implementation of this embodiment, determining the target voltage value of each phase of the motor after compensation according to the voltage compensation value of each phase of the motor, the phase current direction of each phase of the motor and the phase voltage of each phase of the motor includes:

[0099] Determine the phase voltage compensation direction of each phase of the motor according to the phase current direction of each phase of the motor;

[0100] The target voltage value of each phase of the motor is calculated according to the phase voltage of each phase of the motor, the phase voltage compensation direction of each phase of the motor and the voltage compensation value, wherein the voltage compensation value is obtained by the dead zone error voltage in the pulse signal.

[0101] Specifically, in one embodiment, when the phase current is greater than zero, the phase voltage compensation direction is a positive direction, and when the phase current is less than zero, the phase voltage compensation direction is a negative direction.

[0102] Taking a three-phase motor as an example, when the phase voltage compensation direction is positive, the target voltage value of phase a is Ua=Ua0+Udb, where Ua0 is the phase voltage of phase a and Udb is the voltage compensation value; the target voltage value of phase b is Ub=Ub0+Udb, where Ub0 is the phase voltage of phase b; the target voltage value of phase c is Uc=Uc0+Udb, where Uc0 is the phase voltage of phase c; when the phase voltage compensation direction is negative, the target voltage value of phase a is Ua=Ua0-Udb, where Ua0 is the phase voltage of phase a and Udb is the voltage compensation value; the target voltage value of phase b is Ub=Ub0-Udb, where Ub0 is the phase voltage of phase b; the target voltage value of phase c is Uc=Uc0-Udb, where Uc0 is the phase voltage of phase c. The voltage compensation value of each phase is the dead zone error voltage of each phase.

[0103] By adopting this embodiment, the phase voltage compensation direction is determined according to the phase current direction, and then the target voltage value of each phase after compensation, that is, the voltage value of each phase after compensation, is calculated. The calculation is performed step by step and the number of parameters used in the calculation is small, which helps to reduce the difficulty of calculation and improve the calculation efficiency.

[0104] Optionally, in an implementation of this embodiment, the target duty cycle is obtained according to the target voltage value of each phase of the motor and the basic voltage vector of the inverter, including:

[0105] The target voltage values ​​of each phase of the motor are synthesized into a space vector voltage;

[0106] The target duty cycle of each switch element of the inverter is calculated based on the angle between the space vector voltage and the basic voltage vector.

[0107] In this embodiment, the process of adjusting the pulse signal is to first calculate the space vector voltage, and then calculate the target duty cycle of the pulse signal after adjustment according to the angle between the space vector voltage and the basic voltage vector, so as to adjust the pulse signal. Since the duty cycle of the pulse signal is adjusted instead of directly injecting voltage into each phase of the motor, it helps to improve the stability of the voltage of each phase of the motor, thereby stably reducing the motor noise.

[0108] Optionally, in an implementation of this embodiment, the pulse signal of the inverter is adjusted by variable carrier frequency modulation, including:

[0109] In each modulation cycle of the pulse signal, a target carrier frequency is randomly selected from a preset carrier frequency interval for modulation.

[0110] The modulation period is actually the period of the inverter, that is, the control period of the motor. After obtaining the target carrier frequency, the carrier frequency used by the first pulse signal can be replaced with the target carrier frequency, so that the pulse signal generated by the inverter according to the target carrier frequency is the second pulse signal, completing the adjustment of the pulse signal.

[0111] By adopting this embodiment, the target carrier frequency is called for each modulation cycle, so that the target carrier frequency used by the inverter is always changing during the operation of the motor, so that the energy spikes generated during the operation of the inverter can be dispersed. The dispersed harmonic energy reduces the current harmonic amplitude of the carrier frequency and its multiple frequencies, weakens the harmonic current spikes, and achieves the purpose of reducing motor noise.

[0112] Optionally, in an implementation of this embodiment, in the process of adjusting the pulse signal of the inverter used to drive the motor by voltage compensation or variable carrier frequency modulation, the pulse signal is adjusted in combination with the collected noise data.

[0113] The noise data may be collected using a noise sensor or by other means, which is not specifically limited in this embodiment.

[0114] When adopting this embodiment, the noise of the motor is also collected when adjusting the pulse signal to obtain noise data. Since the noise data is the noise actually generated by the motor, it is easy to know the noise reduction effect of the voltage compensation method or the variable carrier frequency modulation method through the noise data, which helps to select the voltage compensation method or variable carrier frequency modulation method with the best noise reduction effect, and also helps to change the adjustment direction of the pulse signal when the noise increases, thereby improving the reliability of noise reduction.

[0115] Optionally, in an implementation of this embodiment, the noise data includes first noise data and second noise data;

[0116] The method also includes:

[0117] If the pulse signal is adjusted by voltage compensation, the first noise data is collected during the adjustment process and the timing for adjusting the pulse signal is selected according to the noise change trend represented by the first noise data; and / or,

[0118] If the pulse signal is adjusted by variable carrier frequency modulation, the second noise data is collected during the adjustment process and the carrier frequency value interval of the target carrier frequency is selected according to the second noise data to modulate the pulse signal using the target carrier frequency.

[0119] That is to say, for the voltage compensation method, the timing for adjusting the pulse signal is selected according to the first noise data, that is, when to adjust the pulse signal and when to stop adjusting the pulse signal. The specific time is the timing.

[0120] For the variable carrier frequency modulation method, a carrier frequency value interval is first selected according to the second noise data, and then the target carrier frequency is obtained from the selected carrier frequency value interval.

[0121] By adopting this embodiment, noise data is used to select the timing for adjusting the pulse signal. This helps to avoid the problem of not being able to correctly compensate for the dead-zone voltage near the zero point of the motor current or even obtaining a reverse effect leading to increased noise when adjusting the pulse signal using voltage compensation. Dead-zone voltage compensation is performed more accurately, avoiding incorrect compensation at the zero point of the motor current, and improving the noise reduction effect.

[0122] For the variable carrier frequency modulation method, the carrier frequency value interval of the target carrier frequency is selected according to the second noise data, so that the selected carrier frequency value interval can make the motor generate the minimum noise, thereby improving the noise reduction effect.

[0123] Optionally, in an implementation of this embodiment, if the pulse signal is adjusted by voltage compensation, first noise data is collected during the adjustment process and a timing for adjusting the pulse signal is selected according to a noise change trend represented by the first noise data, including:

[0124] Obtain the current value of the motor during the pulse signal adjustment process;

[0125] If the current value is within the preset current buffer zone, first noise data is collected and it is determined whether the noise change trend represented by the first noise data is increasing;

[0126] If so, the pulse signal is stopped from being adjusted and the pulse signal is adjusted when the current value is outside the current buffer zone.

[0127] Among them, the current value of the motor will form a current curve over time, specifically a sine curve. That is to say, the current value of the motor will continue to increase, reach a peak value, and then continue to decrease. After decreasing to 0, the current value becomes a negative value, reaches a peak value, and then continues to increase, and so on.

[0128] The current buffer zone is a preset interval for current values, that is, the current buffer zone is a current value interval. Regardless of whether the current value of the motor enters the current buffer zone from the upper limit value of the current buffer zone or from the lower limit value of the current buffer zone, the first noise data will be continuously collected, and it will be determined whether the first noise data has an increasing trend, and when there is an increasing trend, the pulse signal will be stopped from being adjusted.

[0129] In one embodiment, the current buffer zone is an interval where the current value is near zero, that is, the current buffer zone is an interval containing a current value of 0. The size of the interval can be set according to demand, for example, set to -10 to 10 or -8 to 8. This embodiment does not make any specific limitation on this.

[0130] In this embodiment, the current value of the motor is first obtained, and the current buffer zone where the current passes through zero can be known based on the current value. Then, the first noise data in the current buffer zone is collected. If the noise change trend is increasing, it indicates that the dead zone voltage cannot be correctly compensated at the corresponding timing in the current buffer zone. At this time, the pulse signal adjustment is stopped to avoid incorrect compensation at the zero point of the motor current, thereby improving the noise reduction effect.

[0131] Optionally, in an implementation of this embodiment, if the pulse signal is adjusted by variable carrier frequency modulation, the second noise data is collected during the adjustment process and the carrier frequency value interval of the target carrier frequency is selected according to the second noise data to modulate the pulse signal using the target carrier frequency, including:

[0132] The pulse signal is modulated with a variable carrier frequency based on each of the preset multiple carrier frequency value intervals, and noise data is collected during the variable carrier frequency modulation process to obtain second noise data corresponding to each carrier frequency value interval; the duration of the variable carrier frequency modulation corresponding to each carrier frequency value interval is the same and the duration is not less than a preset duration threshold;

[0133] The carrier frequency value interval corresponding to the second noise data representing the minimum noise is used as the carrier frequency value interval for selecting the target carrier frequency, so as to modulate the pulse signal using the target carrier frequency.

[0134] That is to say, when there are multiple carrier frequency value intervals, the carrier frequency value intervals are arranged in a certain order, and a carrier frequency value is randomly selected from the first carrier frequency value interval, and then the pulse signal is modulated according to this carrier frequency value and maintained for a period of time, and the maintenance time is not less than the duration threshold. During this period of maintenance, noise data is continuously collected to obtain the second noise data corresponding to the first carrier frequency value interval; then a carrier frequency value is randomly selected from the second carrier frequency value interval, and the same process is used to obtain the second noise data corresponding to the second carrier frequency value interval, until the second noise data corresponding to the last carrier frequency value interval is obtained. Select a minimum value from all the second noise data and use the carrier frequency value interval corresponding to this minimum value as the carrier frequency value interval for selecting the target carrier frequency. When noise reduction is performed using variable carrier frequency modulation, the target carrier frequency is randomly selected from the carrier frequency value interval.

[0135] According to this embodiment, a carrier frequency value interval with minimum noise is first determined based on the second noise data, and then a target carrier frequency is selected from the carrier frequency value interval to modulate the pulse signal by variable carrier frequency modulation, which helps to improve the noise reduction effect.

[0136] Optionally, in an implementation of this embodiment, before selectively using voltage compensation or variable carrier frequency modulation to adjust the pulse signal of the inverter when the speed intervals of the running speed of the motor are different, the method further includes:

[0137] The running speed of the motor is obtained or the motor running mode of the motor is obtained, wherein the running speed of the motor or the speed range corresponding to the motor can be determined according to the motor running mode.

[0138] In one embodiment, the running speed of the motor can be directly obtained by using sensors or algorithms, and then the speed range can be determined according to the running speed, and voltage compensation or variable carrier frequency modulation can be selectively used for noise reduction. In another embodiment, the motor has a motor operation mode, and different motor operation modes correspond to corresponding motor operation speeds. Therefore, as long as the motor operation mode is obtained, the speed range can be determined. For example, motor operation modes A and B are preset, wherein in motor operation mode A, the running speed of the motor is 500, and in motor operation mode B, the running speed of the motor is 1000. The speed range a is (100-600], and the speed range b is (600,1200]. In this way, when the motor operation mode obtained is B, it can be directly determined that the speed range is b, and there is no need to use sensors or algorithms to obtain the running speed of the motor.

[0139] In other embodiments, the motor operation mode corresponds to a speed interval. That is, a correspondence between the motor operation mode and the speed interval is preset, for example, the motor operation mode M corresponds to the speed interval m, and the motor operation mode N corresponds to the speed interval n. In this way, after the motor operation mode is obtained, the speed interval can be directly determined according to the preset correspondence, so that the voltage compensation or variable carrier frequency modulation method can be selected for noise reduction according to the speed interval, without obtaining the motor operation speed.

[0140] By adopting this implementation, the running speed of the motor can be obtained first, and then the speed interval can be determined according to the running speed. Alternatively, the motor running mode of the motor can be obtained first, and then the running speed or speed interval of the motor can be determined according to the motor running mode. That is, multiple ways of determining the speed interval are provided, making the process of determining the speed interval corresponding to the motor more flexible and convenient.

[0141] The present application takes the field of clothing processing equipment as an example and provides a noise reduction method for clothing processing equipment. A motor for driving a processing drum of the clothing processing equipment to rotate is provided in the clothing processing equipment, and the noise of the motor is reduced.

[0142] Motor operating noise is a relatively important indicator in evaluating washing machine performance, which directly affects the user's subjective perception of the quality of the washing machine. Therefore, optimizing the operating noise of the washing machine motor is one of the most concerned issues for washing machine manufacturers.

[0143] At present, most washing machine drum motors are permanent magnet synchronous motors. In the permanent magnet synchronous motor drive control system, the rectified mains power is output through the three-phase voltage source inverter to drive the motor to operate. The structural diagram of the three-phase voltage source inverter is shown in Figure 3 shown.

[0144] In order to avoid the bus voltage short circuit caused by the simultaneous conduction of the upper and lower switches of the same phase, the rising edge of each switch needs to be delayed for a period of time when generating the PWM signal. This period of time is called the dead time. Figure 4 As shown, although the setting of the dead time solves the problem of simultaneous conduction of the switching tubes, the phase voltage output has a fixed dead zone error voltage Udb=Udc*Td / Ts, where Td is the dead time, Ts is the PWM period, Udc is the bus voltage, and Udb is the dead zone error voltage.

[0145] The phase voltage with dead zone error voltage brings zero current clamping phenomenon and current harmonics to the stator current, causing current distortion, resulting in output torque fluctuation and noise problem in motor operation. The impact brought by dead zone time is the dead zone effect.

[0146] At the same time, the traditional SVPWM uses fixed carrier frequency modulation, which will cause the current to contain harmonic energy concentrated at the switching frequency and its integer multiple frequencies. The concentrated harmonic energy will cause greater motor noise. According to Parseval's theorem, if the width of the switching frequency and its integer multiple harmonic frequencies of the harmonic energy distribution can be expanded, the harmonic peaks in each frequency band will be reduced, thereby reducing the harmonic current amplitude, weakening the harmonic current spikes, and reducing motor noise.

[0147] Based on this, the noise reduction method for a clothing processing device provided in the embodiment of the present application solves at least one of the following technical problems:

[0148] 1. How to reduce the noise caused by the dead zone effect in the washing mode of the washing machine;

[0149] 2. How to reduce the noise caused by the fixed harmonic peak caused by the fixed carrier frequency debugging in the washing machine dehydration mode;

[0150] 3. How to optimize the effect of reducing motor operating noise in low-speed washing mode and high-speed dehydration mode.

[0151] The invention of the noise reduction method for a clothes processing device provided in this embodiment includes at least one of the following inventions:

[0152] 1. Use two different methods to reduce the noise of motors running at different speeds;

[0153] 2. The washing machine is in low speed mode, and the noise caused by the dead zone effect accounts for a large proportion. Dead zone compensation is used to reduce motor noise;

[0154] 3. The washing machine is in high speed operation in dehydration mode. The noise caused by the fixed harmonic peak caused by fixed carrier frequency debugging accounts for a large proportion. Random variable carrier frequency modulation is used to reduce the motor noise.

[0155] 4. Reduce the motor running noise of the washing machine in the full speed range under the composite control mode of dead zone compensation and random variable carrier frequency modulation;

[0156] 5. Use noise sensors to optimize the effect of reducing motor running noise in low-speed washing mode and high-speed dehydration mode.

[0157] In summary, if Figure 5 As shown, the noise reduction method of the clothing processing device provided in the embodiment of the present application includes:

[0158] S300: Acquire an operation mode of a laundry processing device or an operation speed of a motor of the laundry processing device.

[0159] Among them, under different equipment operating modes, the motor has corresponding operating speeds, different motor operating modes or different speed ranges; wherein, the operating speed of the motor or the speed range corresponding to the motor can be determined according to the motor operating mode; wherein the motor includes a motor for driving the processing drum of the clothing processing equipment to rotate.

[0160] Specifically, the device operation mode refers to the mode in which the clothing processing device operates, such as a washing mode, a dehydration mode, a drying mode, etc. This embodiment does not specifically limit this.

[0161] Different operation modes of the equipment indicate that the functions that the clothing processing equipment needs to realize are different, and the operation speed of the motor may naturally be different. For example, in the washing mode, the operation speed of the motor is relatively low, and in the dehydration mode, the operation speed of the motor is relatively high.

[0162] S302: Use the above motor noise reduction method to reduce noise.

[0163] That is to say, according to the device operation mode, the motor operation speed can be obtained, or the speed range corresponding to the motor can be determined. According to the motor operation mode, the motor operation speed can be obtained, or the speed range of the motor can be determined. Therefore, regardless of the device operation mode or the motor operation speed, the speed range can be determined, so that the above-mentioned motor noise reduction method can be adopted, and according to the speed range, voltage compensation or variable carrier frequency modulation can be selectively used for noise reduction.

[0164] With this embodiment, different equipment operation modes have different operating speed requirements for the motor, so the operating speed of the motor can be determined according to the equipment operation mode, and then the pulse signal can be adjusted by voltage compensation or variable carrier frequency modulation according to the equipment operation mode, so that the noise of the motor is reduced. Since different equipment operation modes use different noise reduction methods, and different equipment operation modes correspond to different motor operating speeds, this application can use different noise reduction methods according to the operating conditions of the motor, which helps to improve the noise reduction effect.

[0165] Optionally, in an implementation of this embodiment, the device operation mode includes a first operation mode and a second operation mode, and the operation speed of the motor corresponding to the first operation mode is less than the operation speed of the motor corresponding to the second operation mode;

[0166] If the device operation mode is the first operation mode, the pulse signal is adjusted by voltage compensation;

[0167] If the device operation mode is the second operation mode, the pulse signal is adjusted by variable carrier frequency modulation.

[0168] By adopting this embodiment, for the first operating mode in which the motor runs at a lower speed, the pulse signal is adjusted by voltage compensation, which helps to reduce the noise caused by the dead zone effect of the motor in the low operating speed state; for the second operating mode in which the motor runs at a higher speed, the pulse signal is adjusted by variable carrier frequency modulation, which helps to solve the problem of a large proportion of noise generated by fixed harmonic peaks caused by fixed carrier frequency debugging, thereby achieving noise reduction of the motor.

[0169] Optionally, in an implementation of this embodiment, the first operating mode includes a washing mode, and the second operating mode includes a dehydration mode.

[0170] Optionally, in an implementation of this embodiment, the device operation mode includes at least one operation stage, and the motor has different speed ranges corresponding to different operation stages.

[0171] With this implementation, the motor speed may change in the same device operation mode. For example, in the washing mode, the motor speed may first change from low to high, maintain for a period of time, and then change from high to low and continue for a period of time. Therefore, the motor speed may switch between multiple speed ranges. By limiting the operation stage, different noise reduction methods can be used in different operation stages under the same device operation mode, which helps to improve the noise reduction effect.

[0172] For ease of understanding, Figure 6-9As shown, taking a washing machine as an example, the noise reduction method of the clothing processing device provided in this embodiment is further explained.

[0173] Washing machines have a wide operating range, from low-speed wash mode to high-speed spin mode.

[0174] Washing mode: At low speed, the motor phase voltage Uabc is small, and the fixed dead zone error voltage Udb accounts for a large proportion of the motor phase voltage Uabc. Therefore, the dead zone effect has a greater impact at low speed, and the resulting current distortion is more serious. At this time, the motor's operating noise is mainly caused by the dead zone effect. Therefore, when the motor is running at low speed, the motor phase voltage is compensated for the dead zone error voltage to reduce the zero current clamping phenomenon and current harmonics, and simultaneously reduce current distortion and output torque fluctuations, thereby reducing the motor's operating noise in the washing mode.

[0175] Dehydration mode: At high speed, the motor phase voltage Uabc is large, and the fixed dead zone error voltage Udb is relatively small in proportion to the motor phase voltage Uabc, or even negligible. At this time, the fixed carrier frequency modulation makes the current harmonic amplitude of the carrier frequency and its multiple frequencies larger, and the concentrated harmonic energy brings large harmonic current spikes. At this time, the running noise of the motor is mainly caused by the fixed carrier frequency modulation. Therefore, when the motor is running at high speed, the motor is randomly frequency modulated, so that the energy spikes generated during the opening and closing of the switch tube are no longer concentrated at the fixed frequency and integer multiples, but are dispersed to the switching frequency and integer multiple frequency bands used at this moment. The dispersed harmonic energy reduces the current harmonic amplitude of the carrier frequency and its multiple frequencies, weakens the harmonic current spikes, and achieves the purpose of reducing the motor noise in the dehydration mode. This composite method, based on the characteristics of the washing machine motor operation, can reduce the motor operation noise in the full speed range of washing and dehydration.

[0176] After the washing machine is turned on, it is determined which working mode it is in, and different noise reduction treatments are performed on the washing mode and the dehydration mode.

[0177] If it is in the washing mode, the motor phase voltage is compensated for the dead zone error voltage to reduce the motor running noise. First, calculate the dead zone error voltage, Udb = Udc*Td / Ts, where Udc is the bus voltage, which can be obtained by setting a sampling circuit on the bus; Td is the pre-set dead time, and the size of the dead time is related to the turn-off time of the switch tube. The upper and lower switches of the same bridge arm of the inverter are always turned on and off complementary, and the turn-off time is generally longer than the turn-on time. Therefore, the dead time needs to be longer than the turn-off time of the switch tube to prevent one switch tube from being completely turned off and the other switch tube is turned on again, resulting in a direct short circuit between the upper and lower switches of the same bridge arm. For example, in the parameter table of the switch tube, its turn-off time is 1.15us, and the dead time can be set to 2us. Ts is the PWM cycle. If the input voltage of the washing machine is 220V, the bus voltage Udc is 310V, Td is 2us, and the PWM cycle is 1kHz, then Ts is 1000us, and the dead zone error voltage Udb=310*2 / 1000=0.62V; in the motor control system, the direction of the dead zone compensation voltage of each phase is determined by detecting the phase current signal of each phase. The direction of the dead zone error voltage compensation is determined by detecting the polarity of the phase current Ia, Ib, and Ic of each phase. It is stipulated that the phase current Iabc is greater than zero in the positive direction and less than zero in the negative direction. If Ia is in the positive direction, Ua positively compensates the dead zone error voltage Ua=Ua+Udb; if Ia is in the negative direction, Ua reversely compensates the dead zone error voltage Ua=Ua-Udb. If Ib is in the positive direction, Ub positively compensates the dead zone error voltage Ub=Ub+Udb; if Ib is in the negative direction, Ub reversely compensates the dead zone error voltage Ub=Ub-Udb. If Ic is in the positive direction, Uc positively compensates the dead zone error voltage Uc=Uc+Udb; if Ic is in the negative direction, Uc reversely compensates the dead zone error voltage Uc=Uc-Udb. The compensated phase voltages Ua, Ub, and Uc are synthesized into the space vector voltage Uo. The duty cycle of each switch tube of the three-phase inverter can be calculated by synthesizing the angle between the space vector voltage Uo and the basic voltage vector, thereby controlling the opening and closing of the inverter switch tube, and inputting the compensated voltage to the motor. The compensated phase voltage reduces the zero current clamping phenomenon and current harmonics caused by the dead zone effect, and simultaneously reduces the current distortion and output torque fluctuation, thereby reducing the motor operation noise in the washing mode. However, in actual applications, due to the error of the sampling circuit, there is a deviation when detecting the current zero point, and the dead zone voltage may not be correctly compensated near the motor current zero point, or even a reverse effect may be obtained, resulting in increased noise.A noise sensor can be added, and a current buffer is set at the current zero-crossing point where detection deviation is likely to occur. △i is the current buffer width. When the motor current is within the range of -△i < i < △i, the noise sensor is used to detect whether there is an increasing trend in the current noise. If an increasing trend is detected, it may be a zero-crossing detection deviation. At this time, the dead-time voltage compensation is stopped, and the dead-time voltage compensation is continued after the motor current is outside the current buffer. At this time, the dead-time voltage compensation can be performed more accurately, avoiding miscompensation at the motor current zero-crossing point where detection deviation is likely to occur.

[0178] If in the dehydration mode, the harmonic current spikes are weakened by randomly varying the carrier frequency to reduce the motor running noise. As Figure 6 shown, fb is the base carrier frequency in the washing mode, which can be 1 kHz; △f is the amplitude of the randomly varying carrier frequency; △fmax is the maximum amplitude limit of the randomly varying carrier frequency, which can be 150 Hz, where -△fmax ≤ △f ≤ △fmax, then the range of the randomly varying carrier frequency △f is: 850 Hz ≤ △f ≤ 1150 Hz; the randomly varying carrier frequency is randomly selected within the range of [△f - △fmax, △f + △fmax] based on the base carrier frequency fb, and the actual carrier frequency is fa = fb + △f.

[0179] In each modulation period, the actual carrier frequency fa is obtained through a random algorithm. The actual carrier frequency fa and the duty cycle D of the switch tube generate a PWM signal with a period of 1 / fa, where the high-level time is D* / fa and the low-level time is (1 - D) / fa. At the same duty cycle D, the fa of the fixed carrier frequency is fixed, and the high-level and low-level times are fixed values; the fa of the random carrier frequency changes, and the high-level and low-level times follow the change of fa. The PWM signals of the fixed carrier frequency and the random carrier frequency are as Figure 7 and 8 shown.

[0180] The PWM signal is input to the gate of the switch tube to control the on and off of the switch tube. Under the control of random variable carrier frequency, the frequency of the switch tube on and off changes randomly with fa, so that the energy peaks generated during the on and off process of the switch tube are no longer concentrated at the fixed frequency and integer multiples, but are dispersed to the switching frequency and integer multiple frequency bands used at the moment. The dispersed harmonic energy reduces the current harmonic amplitude of the carrier frequency and its multiple frequencies, weakens the harmonic current spikes, and achieves the purpose of reducing motor noise. However, in actual applications, due to differences between washing machine motors and differences in washing machine structures, the noise levels of the motors in various operating states are also different. The fixed variable carrier frequency amplitude △fmax in the random variable carrier frequency is not necessarily applicable to all washing machines. It is necessary to select the variable carrier frequency amplitude △fmax that can minimize the noise in combination with the actual noise situation. In the dehydration mode, the variable carrier frequency amplitude △fmax is divided into n parts, then there are a total of n variable carrier frequency amplitudes (△fmax / 1, △fmax / 2, △fmax / 3----△fmax / n). In the early stage of the dehydration mode of the washing machine, different variable carrier frequency amplitudes are used in turn for a period of time T. The noise sensor is used to detect the noise value of each variable carrier frequency amplitude during this period of time T (Noise1, Noise2, Noise3---Noisen). The washing machine controller then compares the n noise values ​​and selects the variable carrier frequency amplitude corresponding to the minimum noise value, and selects the variable carrier frequency amplitude with the smallest noise value as the variable carrier frequency amplitude of the variable carrier frequency control of this dehydration mode.

[0181] This composite method, based on the operating characteristics of the washing machine motor, can reduce the motor operating noise in the full speed range of washing and dehydration, thereby improving the user's experience comfort when using the washing machine.

[0182] An embodiment of the present application also provides a clothing processing device, including a processing drum and a motor for driving the processing drum to rotate. The clothing processing device adopts the above-mentioned motor noise reduction method for noise reduction or adopts the above-mentioned clothing processing device noise reduction method for noise reduction.

[0183] The clothing processing equipment includes at least one of a washing machine, a drying machine, a nursing machine, a washing and drying machine in one, and a washing and care machine in one.

[0184] In the above-mentioned embodiments of the present application, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, please refer to the relevant description of other embodiments. The steps shown in the relevant flow chart can be executed in a computer system such as a set of computer executable instructions, and although the logical order is shown in the flow chart, in some cases, the steps shown or described can be executed in an order different from that here. In other words, the order of steps described in the foregoing embodiments is only an example, and it is also within the scope of protection of the embodiments of the present application to reasonably adjust the order of steps based on the content of the embodiments of the present application.

[0185] The sequence of serial numbers or introduction of the embodiments of the present application is for description only and does not represent the superiority or inferiority of the embodiments.

[0186] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website site, computer, server or data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) mode to another website site, computer, server or data center. The computer-readable storage medium can be any available medium that a computer can access, or a data storage device such as a server or data center that includes one or more available media integrated. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a digital versatile disc (DVD)), or a semiconductor medium (e.g., a solid state disk (SSD)). It is worth noting that the computer-readable storage medium mentioned in the embodiment of the present application may be a non-volatile storage medium, in other words, a non-transient storage medium.

[0187] It should be noted that the information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data for analysis, stored data, displayed data, etc.) and signals involved in the embodiments of this application are all authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with the relevant laws, regulations and standards of the relevant countries and regions. For example, the scene data of the current frame in the three-dimensional virtual scene, the device information of the client, and the scene interaction information involved in the embodiments of this application are all obtained with full authorization.

[0188] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.

Claims

1. A method for reducing motor noise, characterized in that: The method comprises: When the speed ranges of the motor are different, voltage compensation or variable carrier frequency modulation is selectively used to adjust the pulse signal of the inverter, wherein the inverter is electrically connected to each phase of the motor and is used to control the voltage and / or current of each phase of the motor based on the pulse signal, wherein the maximum speed value of the speed range corresponding to the voltage compensation does not exceed the minimum speed value of the speed range corresponding to the variable carrier frequency modulation.

2. The motor noise reduction method according to claim 1, characterized in that: The pulse signal includes a first pulse signal before adjustment and a second pulse signal after adjustment; The pulse signal of the inverter is adjusted by voltage compensation, including: Determining a target voltage value of each phase of the motor after compensation according to the voltage compensation value of each phase of the motor, the phase current direction of each phase of the motor and the phase voltage of each phase of the motor; Obtaining a target duty cycle according to the target voltage value of each phase of the motor and a basic voltage vector of the inverter; The second pulse signal is obtained based on the first pulse signal and the target duty cycle.

3. The motor noise reduction method according to claim 2, characterized in that: Determining the target voltage value of each phase of the motor after compensation according to the voltage compensation value of each phase of the motor, the phase current direction of each phase of the motor and the phase voltage of each phase of the motor includes: Determining a phase voltage compensation direction of each phase of the motor according to a phase current direction of each phase of the motor; The target voltage value of each phase of the motor is calculated according to the phase voltage of each phase of the motor, the phase voltage compensation direction of each phase of the motor and the voltage compensation value, wherein the voltage compensation value is obtained by the dead zone error voltage in the pulse signal.

4. The motor noise reduction method according to claim 2, characterized in that: The step of obtaining a target duty cycle according to the target voltage value of each phase of the motor and the basic voltage vector of the inverter includes: Combining the target voltage values ​​of each phase of the motor into a space vector voltage; The target duty cycle of each switch element of the inverter is obtained by calculating the angle between the space vector voltage and the basic voltage vector.

5. The motor noise reduction method according to claim 1, characterized in that: The pulse signal of the inverter is adjusted by variable carrier frequency modulation, including: In each modulation cycle of the pulse signal, a target carrier frequency is randomly selected from a preset carrier frequency interval for modulation.

6. The motor noise reduction method according to claim 1, characterized in that: In the process of adjusting the pulse signal of the inverter used to drive the motor to operate by means of voltage compensation or variable carrier frequency modulation, the pulse signal is adjusted in combination with the collected noise data.

7. The motor noise reduction method according to claim 6, characterized in that: The noise data includes first noise data and second noise data; The method further comprises: If the voltage compensation method is used to adjust the pulse signal, first noise data is collected during the adjustment process and the timing for adjusting the pulse signal is selected according to the noise change trend represented by the first noise data; and / or, If the pulse signal is adjusted by the variable carrier frequency modulation method, second noise data is collected during the adjustment process and a carrier frequency value interval of a target carrier frequency is selected according to the second noise data, so as to modulate the pulse signal using the target carrier frequency.

8. The motor noise reduction method according to claim 7, characterized in that: If the pulse signal is adjusted by the voltage compensation method, first noise data is collected during the adjustment process and a time to adjust the pulse signal is selected according to a noise change trend represented by the first noise data, including: Acquiring the current value of the motor during the pulse signal adjustment process; If the current value is within the preset current buffer zone, collecting the first noise data and determining whether the noise change trend represented by the first noise data is increasing; If so, stop adjusting the pulse signal and adjust the pulse signal when the current value is outside the current buffer zone.

9. The motor noise reduction method according to claim 7, characterized in that: If the pulse signal is adjusted by the variable carrier frequency modulation method, the second noise data is collected during the adjustment process and the carrier frequency value interval of the target carrier frequency is selected according to the second noise data, so as to modulate the pulse signal using the target carrier frequency, including: The pulse signal is subjected to the variable carrier frequency modulation based on each of the preset multiple carrier frequency value intervals, and noise data is collected during the variable carrier frequency modulation process to obtain the second noise data corresponding to each of the carrier frequency value intervals; the duration of the variable carrier frequency modulation corresponding to each of the carrier frequency value intervals is the same and the duration is not less than a preset duration threshold; The carrier frequency value interval corresponding to the second noise data representing the minimum noise is used as the carrier frequency value interval for selecting the target carrier frequency, so as to modulate the pulse signal using the target carrier frequency.

10. The motor noise reduction method according to any one of claims 1 to 9, characterized in that: Before selectively adjusting the pulse signal of the inverter by voltage compensation or variable carrier frequency modulation when the speed intervals of the motor are different, the method further includes: The running speed of the motor is obtained or the motor running mode of the motor is obtained, wherein the running speed of the motor or the speed range corresponding to the motor can be determined according to the motor running mode.

11. A method for reducing noise of a clothes processing device, characterized in that: The method comprises: Acquiring an equipment operation mode of the clothes processing equipment or an operation speed of a motor of the clothes processing equipment, wherein, under different equipment operation modes, the motor corresponds to different operation speeds, different motor operation modes or different speed ranges; wherein, according to the motor operation mode, the operation speed of the motor or the speed range corresponding to the motor can be determined; wherein, the motor includes a motor for driving a processing drum of the clothes processing equipment to rotate; Noise reduction is performed using the motor noise reduction method described in any one of claims 1 to 10.

12. The noise reduction method of a clothes processing device according to claim 11, characterized in that: The device operation mode includes a first operation mode and a second operation mode, and the operation speed of the motor corresponding to the first operation mode is lower than the operation speed of the motor corresponding to the second operation mode; If the device operation mode is the first operation mode, adjusting the pulse signal by means of voltage compensation; If the device operation mode is the second operation mode, the pulse signal is adjusted by variable carrier frequency modulation.

13. The noise reduction method of a clothes processing device according to claim 12, characterized in that: The first operation mode includes a washing mode, and the second operation mode includes a dehydration mode.

14. The noise reduction method of a clothes processing device according to claim 11, characterized in that: The equipment operation mode includes at least one operation stage, and the motor has different corresponding speed ranges in different operation stages.

15. A clothes processing device, characterized in that: The device comprises a processing drum and a motor for driving the processing drum to rotate. The clothing processing device adopts the motor noise reduction method described in any one of claims 1 to 10 to reduce noise or adopts the clothing processing device noise reduction method described in any one of claims 11 to 14 to reduce noise.

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