A multi-motor drive system and all-in-one machine device

Abstract

The utility model discloses a kind of multi-motor drive system and all-in-one machine equipment, the multi-motor drive system includes at least one indoor unit, and at least one outdoor unit, further include the first drive module for driving all the indoor unit, and the second drive module for driving all the outdoor unit;Between each the indoor unit with the first drive module, and each the outdoor unit with the second drive module are provided with noise reduction module.Compared with prior art, the utility model controls indoor unit and outdoor unit using one drive module respectively, avoids controlling indoor unit and outdoor unit simultaneously by single drive module, leading to mutual interference between motor, the problem of large electromagnetic noise.

Description

Technical Field

[0001] This utility model relates to the field of control of integrated machine equipment, and in particular to a multi-motor drive system and integrated machine equipment. Background Technology

[0002] Traditional kitchen renovation plans often suffer from problems such as inconvenient installation and large space occupation when designing range hoods and air conditioners for home kitchens.

[0003] To address the aforementioned issues, current solutions often involve designing an integrated unit that combines the air conditioner and range hood. In this design, multiple motors are typically controlled simultaneously by a single IPM module, which can lead to unbalanced control and interference between the motors. This is particularly problematic when the range hood and air conditioner are starting up, resulting in significant electromagnetic noise.

[0004] Therefore, how to design a multi-motor drive system and integrated equipment that can solve the problem of high electromagnetic noise when range hoods and air conditioners are started is a technical problem that the industry urgently needs to solve. Utility Model Content

[0005] In view of the problem of high electromagnetic noise in the existing integrated range hood and air conditioner equipment, this utility model proposes a multi-motor drive system and integrated equipment.

[0006] The technical solution of this utility model is to propose a multi-motor drive system, including at least one indoor unit and at least one outdoor unit, and further including a first drive module for driving all the indoor units and a second drive module for driving all the outdoor units.

[0007] A noise reduction module is provided between each indoor unit and the first drive module, and between each outdoor unit and the second drive module.

[0008] Furthermore, the first drive module adopts an IPM module having a first bridge arm, a second bridge arm, and a third bridge arm;

[0009] The three-phase inputs of the indoor unit are respectively connected to the midpoint of the first bridge arm, the midpoint of the second bridge arm, and the midpoint of the third bridge arm.

[0010] Furthermore, the indoor unit includes an indoor fan and a range hood;

[0011] The noise reduction module includes a first LC filter group connected to each phase input of the internal fan and a second LC filter group connected to each phase input of the range hood.

[0012] The three-phase input of the internal fan is connected to the midpoint of the first bridge arm, the midpoint of the second bridge arm, and the midpoint of the third bridge arm through the first LC filter group. The three-phase input of the range hood is connected to the side of the first LC filter group near the internal fan through the second LC filter group.

[0013] Furthermore, the first LC filter bank includes inductors L1, L2, and L3, and capacitors C1, C2, and C3.

[0014] The second LC filter bank includes inductors L4, L5, and L6, and capacitors C4, C5, and C6.

[0015] The first phase input of the internal fan is connected in series with the inductor L1 and then connected to the midpoint of the first bridge arm. One end of the capacitor C1 is connected between the inductor L1 and the first phase input of the internal fan, and the other end of the capacitor C1 is grounded.

[0016] The second phase input of the internal fan is connected in series with the inductor L2 and then connected to the midpoint of the second bridge arm. One end of the capacitor C2 is connected between the inductor L2 and the second phase input of the internal fan, and the other end of the capacitor C2 is grounded.

[0017] The third phase input of the internal fan is connected in series with the inductor L3 and then connected to the midpoint of the third bridge arm. One end of the capacitor C3 is connected between the inductor L3 and the third phase input of the internal fan, and the other end of the capacitor C3 is grounded.

[0018] The first phase input of the range hood is connected in series with the inductor L4 and then connected between the inductor L1 and the first phase input of the internal fan. One end of the capacitor C4 is connected between the inductor L4 and the first phase input of the range hood, and the other end of the capacitor C4 is grounded.

[0019] The second phase input of the range hood is connected in series with the inductor L5 and then connected between the inductor L2 and the second phase input of the internal fan. One end of the capacitor C5 is connected between the inductor L5 and the second phase input of the range hood, and the other end of the capacitor C5 is grounded.

[0020] The third phase input of the range hood is connected in series with the inductor L6 and then connected between the inductor L3 and the third phase input of the internal fan. One end of the capacitor C6 is connected between the inductor L6 and the third phase input of the range hood, and the other end of the capacitor C6 is grounded.

[0021] Furthermore, the second drive module adopts an IPM module with a fourth bridge arm, a fifth bridge arm, and a sixth bridge arm;

[0022] The three-phase input of the outdoor unit is connected to the midpoint of the fourth bridge arm, the midpoint of the fifth bridge arm, and the midpoint of the sixth bridge arm, respectively.

[0023] Furthermore, the outdoor unit includes an outdoor fan and a compressor;

[0024] The noise reduction module includes a third LC filter group connected to each phase input of the external fan and a fourth LC filter group connected to each phase input of the compressor.

[0025] The three-phase input of the external fan is connected to the midpoint of the fourth arm, the midpoint of the fifth arm, and the midpoint of the sixth arm through the third LC filter group. The three-phase input of the compressor is connected to the side of the third LC filter group near the external fan through the fourth LC filter group.

[0026] Furthermore, the third LC filter bank includes inductors L7, L8, L9, capacitors C7, C8, and C9.

[0027] The fourth LC filter group includes inductors L10, L11, L12, capacitors C10, C11, and C12.

[0028] The first phase input of the external fan is connected in series with the inductor L7 and then connected to the midpoint of the fourth bridge arm. One end of the capacitor C7 is connected between the inductor L7 and the first phase input of the external fan, and the other end of the capacitor C7 is grounded.

[0029] The second phase input of the external fan is connected in series with the inductor L8 and then connected to the midpoint of the fifth bridge arm. One end of the capacitor C8 is connected between the inductor L8 and the second phase input of the external fan, and the other end of the capacitor C8 is grounded.

[0030] The third phase input of the external fan is connected in series with the inductor L9 and then connected to the midpoint of the sixth bridge arm. One end of the capacitor C9 is connected between the inductor L9 and the third phase input of the external fan, and the other end of the capacitor C9 is grounded.

[0031] The first phase input of the compressor is connected in series with the inductor L10 and then connected between the inductor L7 and the first phase input of the external fan. One end of the capacitor C10 is connected between the inductor L10 and the first phase input of the compressor, and the other end of the capacitor C10 is grounded.

[0032] The second phase input of the compressor is connected in series with the inductor L11 and then connected between the inductor L8 and the second phase input of the external fan. One end of the capacitor C11 is connected between the inductor L11 and the second phase input of the compressor, and the other end of the capacitor C11 is grounded.

[0033] The third phase input of the compressor is connected in series with the inductor L12 and then connected between the inductor L9 and the third phase input of the external fan. One end of the capacitor C12 is connected between the inductor L12 and the third phase input of the compressor, and the other end of the capacitor C12 is grounded.

[0034] Furthermore, the output current of the first drive module is higher than the operating current of the indoor unit;

[0035] The output current of the second drive module is higher than the operating current of the outdoor unit.

[0036] Furthermore, the noise reduction module has a filter inductor and a filter capacitor, wherein the inductive reactance of the filter inductor is greater than the capacitive reactance of the filter capacitor.

[0037] This utility model also proposes an integrated machine device, which has the above-mentioned multi-motor drive system;

[0038] The indoor unit includes an indoor fan and a range hood, and the outdoor unit includes an outdoor fan and a compressor.

[0039] Compared with the prior art, the present invention has at least the following beneficial effects:

[0040] This invention provides separate drive modules for the indoor range hood and internal fan, as well as the outdoor fan and compressor, allowing for separate control of the indoor and outdoor units and avoiding electromagnetic noise caused by mutual interference between motors. Furthermore, based on the above-mentioned design, this invention also includes a noise reduction module, achieving both cost reduction and noise reduction. Attached Figure Description

[0041] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0043] Figure 2 This is a connection diagram of the indoor unit in this utility model;

[0044] Figure 3 This is a schematic diagram of the outdoor unit in this utility model. Detailed Implementation

[0045] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0046] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present invention, and does not imply that every embodiment of the present invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0047] The principle and structure of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0048] Currently, in integrated range hood and air conditioner units, an IPM module controls both the indoor and outdoor units simultaneously. However, due to mutual interference between motors, there is an imbalance in control, resulting in high electromagnetic noise.

[0049] Based on the problems existing in the prior art, this utility model proposes a multi-motor drive system, which includes at least one indoor unit and at least one outdoor unit, and also includes a first drive module for driving all indoor units and a second drive module for driving all outdoor units.

[0050] Noise reduction modules are installed between each indoor unit and the first drive module, and between each outdoor unit and the second drive module.

[0051] In existing technologies, the problem of high electromagnetic noise arises because when an IPM module simultaneously controls both the indoor and outdoor units, the control becomes unbalanced, leading to mutual interference between the two units. In this invention, by controlling the indoor and outdoor units separately through a first drive module and a second drive module, this unbalanced control problem can be avoided, thus preventing the generation of electromagnetic noise.

[0052] In addition, based on the above improvements, this utility model also includes multiple noise reduction modules, which are respectively located between the indoor unit and the first drive module, and between the outdoor unit and the second drive module, to further reduce electromagnetic noise.

[0053] In other words, through the above-described design, this utility model can achieve the beneficial effects described above:

[0054] This invention provides separate drive modules for the indoor range hood and internal fan, as well as the outdoor fan and compressor, allowing for separate control of the indoor and outdoor units and avoiding electromagnetic noise caused by mutual interference between motors. Furthermore, based on the above-mentioned design, this invention also includes a noise reduction module, achieving both cost reduction and noise reduction.

[0055] Please see Figure 1 and Figure 2 In this utility model, the first drive module adopts an IIPM module having a first bridge arm, a second bridge arm, and a third bridge arm;

[0056] The three-phase inputs of the indoor unit are connected to the midpoints of the first bridge arm, the second bridge arm, and the third bridge arm, respectively.

[0057] Here, the first drive module adopts an IPM (Intelligent Power Module), which is a highly integrated power semiconductor solution that integrates power device (such as IGBT, MOSFET) drive circuits and protection functions into one unit. It can be directly used to control and drive high-power electronic devices, such as motor drivers and frequency converters. Its core value lies in improving system efficiency and simplifying circuit structure through high integration design, enhancing reliability through built-in protection mechanisms, and meeting the requirements of miniaturization and cost optimization.

[0058] Here, the three-phase input of the indoor unit is connected to the midpoint of the first bridge arm, the midpoint of the second bridge arm, and the midpoint of the third bridge arm, respectively, so as to control the working state of the indoor unit by using the on / off state of the switching tube in the first drive module.

[0059] By utilizing the configuration of this first drive module, this invention can achieve advantages such as high efficiency, low EMI, extreme miniaturization, and high reliability.

[0060] Specifically, the multi-motor drive system in this utility model can be applied to the integrated air conditioner and range hood in the prior art. For the integrated air conditioner and range hood, its indoor unit can include an indoor fan and a range hood.

[0061] Its noise reduction module includes a first LC filter group connected to each phase input of the internal fan and a second LC filter group connected to each phase input of the range hood;

[0062] The three-phase input of the indoor fan is connected to the midpoint of the first bridge arm, the midpoint of the second bridge arm, and the midpoint of the third bridge arm through the first LC filter group. The three-phase input of the range hood is connected to the side of the first LC filter group closest to the indoor fan through the second LC filter group.

[0063] Please see Figure 1 and Figure 2 The first LC filter bank here consists of inductors L1, L2, and L3, and capacitors C1, C2, and C3. The second LC filter bank consists of inductors L4, L5, and L6, and capacitors C4, C5, and C6. When controlling the indoor fan and range hood, the first drive module sends corresponding control signals from the auxiliary... Figure 1 and appendix Figure 2 It can be seen that when the first drive module sends a control signal to the indoor fan, its current path only needs to pass through the first LC filter group. When the first drive module sends a control signal to the range hood, its current path needs to pass through the first LC filter group first, and then through the second LC filter group before it can enter the range hood for control.

[0064] In other words, based on the above connection method, this utility model can achieve single-stage noise reduction for the internal fan and two-stage noise reduction for the range hood. This noise reduction method can greatly eliminate electromagnetic noise that occurs during operation. In addition, under this design, this utility model can also add an algorithm to achieve complementary noise reduction, further improving the noise reduction capability.

[0065] Please see Figure 1 and Figure 2 In this utility model, the first LC filter group includes inductors L1, L2, L3, capacitors C1, C2, and C3.

[0066] The second LC filter bank includes inductors L4, L5, and L6, and capacitors C4, C5, and C6.

[0067] The first phase input of the internal fan is connected in series with inductor L1 and then connected to the midpoint of the first bridge arm. One end of capacitor C1 is connected between inductor L1 and the first phase input of the internal fan, and the other end of capacitor C1 is grounded.

[0068] The second phase input of the internal fan is connected in series with inductor L2 and then connected to the midpoint of the second bridge arm. One end of capacitor C2 is connected between inductor L2 and the second phase input of the internal fan, and the other end of capacitor C2 is grounded.

[0069] The third phase input of the internal fan is connected in series with inductor L3 and then connected to the midpoint of the third bridge arm. One end of capacitor C3 is connected between inductor L3 and the third phase input of the internal fan, and the other end of capacitor C3 is grounded.

[0070] The first phase input of the range hood is connected in series with inductor L4 and then connected between inductor L1 and the first phase input of the internal fan. One end of capacitor C4 is connected between inductor L4 and the first phase input of the range hood, and the other end of capacitor C4 is grounded.

[0071] The second phase input of the range hood is connected in series with inductor L5 and then connected between inductor L2 and the second phase input of the internal fan. One end of capacitor C5 is connected between inductor L5 and the second phase input of the range hood, and the other end of capacitor C5 is grounded.

[0072] The third phase input of the range hood is connected in series with inductor L6 and then between inductor L3 and the third phase input of the internal fan. One end of capacitor C6 is connected between inductor L6 and the third phase input of the range hood, and the other end of capacitor C6 is grounded.

[0073] The above-mentioned configuration refers to the specific connection structure between the internal fan and the first drive module via the first LC filter group in this utility model, and the specific connection structure between the range hood and the first drive module via the first LC filter group and the second LC filter group. With this configuration, this utility model can achieve the beneficial effects described above:

[0074] This invention provides separate drive modules for the indoor range hood and internal fan, as well as the outdoor fan and compressor, allowing for separate control of the indoor and outdoor units and avoiding electromagnetic noise caused by mutual interference between motors. Furthermore, based on the above-mentioned design, this invention also includes a noise reduction module, achieving both cost reduction and noise reduction.

[0075] Please see Figure 1 For the indoor unit, it also includes components such as mains voltage, diode D1, diode D2, diode D3, diode D4, and the indoor unit main control chip;

[0076] Here, the mains voltage is used to provide AC input. Diodes D1, D2, D3, and D4 form a rectifier module, which is used to convert the AC input into DC input and provide it to the first drive module. The indoor unit's main control chip is used to control the on / off state of each switch in the first drive module, thereby realizing the control of the indoor fan and range hood.

[0077] Please see Figure 1 and Figure 3 In this utility model, the second drive module adopts an IPM module with a fourth bridge arm, a fifth bridge arm, and a sixth bridge arm;

[0078] The three-phase inputs of the outdoor unit are connected to the midpoints of the fourth arm, the fifth arm, and the sixth arm, respectively.

[0079] Here, the second drive module adopts an IPM (Intelligent Power Module), which is a highly integrated power semiconductor solution that integrates power device (such as IGBT, MOSFET) drive circuits and protection functions into one unit. It can be directly used to control and drive high-power electronic devices, such as motor drivers and frequency converters. Its core value lies in improving system efficiency and simplifying circuit structure through high integration design, enhancing reliability through built-in protection mechanisms, and meeting the requirements of miniaturization and cost optimization.

[0080] Here, the three-phase input of the outdoor unit is connected to the midpoint of the fourth bridge arm, the midpoint of the fifth bridge arm, and the midpoint of the sixth bridge arm, respectively, so as to control the working status of the outdoor unit by using the on / off state of the switching tube in the second drive module.

[0081] By utilizing this second drive module, the present invention can achieve advantages such as high efficiency, low EMI, extreme miniaturization, and high reliability.

[0082] Specifically, the multi-motor drive system in this utility model can be applied to the integrated air conditioner and range hood in the prior art. For the integrated air conditioner and range hood, its outdoor unit can include an outdoor fan and a compressor.

[0083] Its noise reduction module includes a third LC filter group connected to each phase input of the external fan and a fourth LC filter group connected to each phase input of the compressor.

[0084] The three-phase input of the outdoor fan is connected to the midpoint of the fourth arm, the midpoint of the fifth arm, and the midpoint of the sixth arm through the third LC filter group. The three-phase input of the compressor is connected to the side of the third LC filter group closest to the outdoor fan through the fourth LC filter group.

[0085] Please see Figure 1 and Figure 3 The third LC filter bank here consists of inductors L7, L8, and L9, and capacitors C7, C8, and C9. The fourth LC filter bank consists of inductors L10, L11, and L12, and capacitors C10, C11, and C12. When controlling the external fan and compressor, the corresponding control signals are sent through the second drive module, from the attached... Figure 1 and appendix Figure 3 It can be seen that when the second drive module sends a control signal to the external fan, its current path only needs to pass through the third LC filter group. When the second drive module sends a control signal to the compressor, its current path needs to pass through the third LC filter group first, and then through the fourth LC filter group before it can enter the compressor for control.

[0086] In other words, based on the above connection method, this utility model can achieve single-stage noise reduction for the external fan and two-stage noise reduction for the compressor. This noise reduction method can greatly eliminate electromagnetic noise that occurs during operation. In addition, under this design, this utility model can also add an algorithm to achieve complementary noise reduction, further improving the noise reduction capability.

[0087] Please see Figure 1 and Figure 3 The third LC filter group in this utility model includes inductors L7, L8, L9, capacitors C7, C8, and C9.

[0088] The fourth LC filter bank includes inductors L10, L11, and L12, and capacitors C10, C11, and C12.

[0089] The first phase input of the outdoor fan is connected in series with inductor L7 and then connected to the midpoint of the fourth bridge arm. One end of capacitor C7 is connected between inductor L7 and the first phase input of the outdoor fan, and the other end of capacitor C7 is grounded.

[0090] The second phase input of the outdoor fan is connected in series with inductor L8 and then connected to the midpoint of the fifth bridge arm. One end of capacitor C8 is connected between inductor L8 and the second phase input of the outdoor fan, and the other end of capacitor C8 is grounded.

[0091] The third phase input of the outdoor fan is connected in series with inductor L9 and then connected to the midpoint of the sixth bridge arm. One end of capacitor C9 is connected between inductor L9 and the third phase input of the outdoor fan, and the other end of capacitor C9 is grounded.

[0092] The first phase input of the compressor is connected in series with inductor L10 and then connected between inductor L7 and the first phase input of the outdoor fan. One end of capacitor C10 is connected between inductor L10 and the first phase input of the compressor, and the other end of capacitor C10 is grounded.

[0093] The second phase input of the compressor is connected in series with inductor L11 and then connected between inductor L8 and the second phase input of the outdoor fan. One end of capacitor C11 is connected between inductor L11 and the second phase input of the compressor, and the other end of capacitor C11 is grounded.

[0094] The compressor's third-phase input is connected in series with inductor L12 and then between inductor L9 and the third-phase input of the outdoor fan. One end of capacitor C12 is connected between inductor L12 and the compressor's third-phase input, and the other end of capacitor C12 is grounded.

[0095] The above-mentioned configuration refers to the specific connection structure between the external fan and the second drive module via the third LC filter group, and the specific connection structure between the compressor and the second drive module via the third LC filter group and the fourth LC filter group. With this configuration, the present invention can achieve the beneficial effects described above:

[0096] This invention provides separate drive modules for the indoor range hood and internal fan, as well as the outdoor fan and compressor, allowing for separate control of the indoor and outdoor units and avoiding electromagnetic noise caused by mutual interference between motors. Furthermore, based on the above-mentioned design, this invention also includes a noise reduction module, achieving both cost reduction and noise reduction.

[0097] Please see Figure 1 The outdoor unit also includes components such as grid voltage, diodes D5, D6, D7, D8, and D9, inductor L13, switching transistor Z13, capacitors C13, C14, and C15, as well as the outdoor unit driver chip.

[0098] Here, the mains voltage is used to provide AC input. Diodes D5, D6, D7, and D8 form a rectifier module to convert the AC input into DC input and provide it to the second drive module. Capacitors C13, C14, and C15 are used as energy storage capacitors to store electrical energy and provide it to the second drive module. Diode D9 is used to prevent backflow. The outdoor unit drive chip is used to control the on / off state of each switch in the second drive module, thereby realizing the control of the external fan and compressor.

[0099] Furthermore, in this invention, the output current of the first drive module needs to be higher than the operating current of the indoor unit.

[0100] The output current of the second drive module is higher than the operating current of the outdoor unit.

[0101] This setting is because the first drive module needs to control both the indoor fan and the range hood simultaneously. To ensure the stability of its control, the current rating of the first drive module needs to be higher than that of the range hood and the indoor fan. For example, if the current rating of the indoor fan and the range hood is 30A, then the first drive module needs to be selected with a current rating of 30A or higher, such as 40A or 50A.

[0102] Similarly, the second drive module must also be configured to have a current rating higher than that of the outdoor fan and compressor.

[0103] Furthermore, the LC filter bank used in the noise reduction module of this utility model is configured as an LC sinusoidal resonant filter, and its specific configuration logic is as follows:

[0104] When the filter inductor impedance is much smaller than the load impedance, the filtering characteristics of the LC sinusoidal resonant filter used are approximately as follows:

[0105]

[0106] in w0 is the resonant angular frequency, Uo is the transfer function output, Ui is the transfer function input, L is the inductance parameter, and C is the capacitance parameter.

[0107] Based on the derivation formula of the LC sinusoidal resonant filter, a better effect with attenuation of nearly 40dB can be achieved. The first driving module outputs sinusoidal voltage and sinusoidal current to quickly filter the higher harmonics of the system. By adding a first-stage LC sinusoidal resonant filter (i.e., the first LC filter bank) and a second-stage LC sinusoidal filter (i.e., the second LC filter bank), and adjusting the parameters in practice, the effect of rapid noise reduction can be achieved.

[0108] Based on testing experience, the cutoff frequency should be selected to be less than 0.1 times the carrier frequency. In addition, considering that a very low cutoff frequency will cause resonance amplification of the fundamental frequency, the cutoff frequency should be more than 10 times higher than the fundamental frequency.

[0109]

[0110] Where fc is the carrier frequency and fr is the fundamental frequency;

[0111] When selecting the parameters of an LC sinusoidal resonant filter, it should be considered that the DC component on the LC inductor should not exceed a certain range.

[0112] Generally, when setting up an LC sinusoidal resonant filter, the DC component on the LC inductor should not exceed 0.1. In addition, the high-frequency inductive reactance of the LC sinusoidal resonant filter should be greater than the capacitive reactance. By selecting appropriate parameters for the LC sinusoidal resonant filter, electromagnetic interference on a single drive module with dual load motors can be limited.

[0113] The resonant current of the LC sinusoidal resonant filter should not exceed 10% to 20% of the inverter current. Otherwise, the resonant current of the drive module will be too large, causing the system to enter input current, fan demagnetization protection, compressor demagnetization protection, etc.

[0114] Given the effective value of the load current I, the fundamental voltage across the series inductor L is U, and the voltage drop across the series inductor is expressed as follows:

[0115] U=2πf0LI

[0116] Through the above mathematical modeling and analysis, electromagnetic noise reduction of the motor can be achieved by reasonably setting the filtering parameters of the LC sinusoidal resonant filter.

[0117] The circuit between the range hood and the first drive module has two LC sinusoidal resonant filters, which theoretically attenuate high-frequency signals, achieving a doubling effect. Its filtering characteristics can be expressed as follows:

[0118]

[0119] The effective output of the drive module is U, the effective value of the load current is I, the fundamental voltage across the series inductor L is U, and the voltage drop across the series inductor is expressed as follows:

[0120] U=(2πf0LI) 2

[0121] A single IPM controls two motors, and an LC sine wave resonant filter is added to reduce electromagnetic noise during fan startup.

[0122] In addition to the aforementioned LC sinusoidal resonant filter, this invention also employs a random frequency high-frequency injection method, the working principle of which is as follows:

[0123] During motor operation, the PWM signal output by the drive module contains a large number of high-order harmonics. The high-frequency injection method introduces a high-frequency signal of a specific frequency to change the resonance characteristics of the system, thereby suppressing high-order harmonics and reducing electromagnetic noise.

[0124] Smoothing current waveform: High-frequency injected signals can "fill" the irregular parts of the current waveform, making the current closer to a sine wave, thereby reducing electromagnetic noise and torque ripple.

[0125] Suppressing system resonance: Under certain operating conditions, the system may experience resonance, leading to increased noise or even equipment damage. High-frequency injection can break the resonance condition, thereby suppressing noise.

[0126] Dynamic adjustment to adapt to different loads: During motor operation, the load may change. The high-frequency injection method can dynamically adjust the injection parameters (such as frequency and amplitude) according to the load changes, maintaining a good noise reduction effect.

[0127] Based on the above configuration, this utility model also proposes an integrated unit with the aforementioned multi-motor drive system. The indoor unit includes an indoor fan and a range hood, and the outdoor unit includes an outdoor fan and a compressor. This unit can be used in an integrated air conditioner and range hood unit.

[0128] In summary, compared with the prior art, the present invention has at least the following beneficial effects:

[0129] This invention provides separate drive modules for the indoor range hood and internal fan, as well as the outdoor fan and compressor, allowing for separate control of the indoor and outdoor units and avoiding electromagnetic noise caused by mutual interference between motors. Furthermore, based on the above-mentioned design, this invention also includes a noise reduction module, achieving both cost reduction and noise reduction.

[0130] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A multi-motor drive system, comprising at least one indoor unit and at least one outdoor unit, characterized in that, It also includes a first drive module for driving all the indoor units and a second drive module for driving all the outdoor units; A noise reduction module is provided between each indoor unit and the first drive module, and between each outdoor unit and the second drive module.

2. The multi-motor drive system according to claim 1, characterized in that, The first drive module adopts an IPM module having a first bridge arm, a second bridge arm, and a third bridge arm; The three-phase inputs of the indoor unit are respectively connected to the midpoint of the first bridge arm, the midpoint of the second bridge arm, and the midpoint of the third bridge arm.

3. The multi-motor drive system according to claim 2, characterized in that, The indoor unit includes an indoor fan and a range hood; The noise reduction module includes a first LC filter group connected to each phase input of the internal fan and a second LC filter group connected to each phase input of the range hood. The three-phase input of the internal fan is connected to the midpoint of the first bridge arm, the midpoint of the second bridge arm, and the midpoint of the third bridge arm through the first LC filter group. The three-phase input of the range hood is connected to the side of the first LC filter group near the internal fan through the second LC filter group.

4. The multi-motor drive system according to claim 3, characterized in that, The first LC filter bank includes inductors L1, L2, and L3, and capacitors C1, C2, and C3. The second LC filter bank includes inductors L4, L5, and L6, and capacitors C4, C5, and C6. The first phase input of the internal fan is connected in series with the inductor L1 and then connected to the midpoint of the first bridge arm. One end of the capacitor C1 is connected between the inductor L1 and the first phase input of the internal fan, and the other end of the capacitor C1 is grounded. The second phase input of the internal fan is connected in series with the inductor L2 and then connected to the midpoint of the second bridge arm. One end of the capacitor C2 is connected between the inductor L2 and the second phase input of the internal fan, and the other end of the capacitor C2 is grounded. The third phase input of the internal fan is connected in series with the inductor L3 and then connected to the midpoint of the third bridge arm. One end of the capacitor C3 is connected between the inductor L3 and the third phase input of the internal fan, and the other end of the capacitor C3 is grounded. The first phase input of the range hood is connected in series with the inductor L4 and then connected between the inductor L1 and the first phase input of the internal fan. One end of the capacitor C4 is connected between the inductor L4 and the first phase input of the range hood, and the other end of the capacitor C4 is grounded. The second phase input of the range hood is connected in series with the inductor L5 and then connected between the inductor L2 and the second phase input of the internal fan. One end of the capacitor C5 is connected between the inductor L5 and the second phase input of the range hood, and the other end of the capacitor C5 is grounded. The third phase input of the range hood is connected in series with the inductor L6 and then connected between the inductor L3 and the third phase input of the internal fan. One end of the capacitor C6 is connected between the inductor L6 and the third phase input of the range hood, and the other end of the capacitor C6 is grounded.

5. The multi-motor drive system according to claim 1, characterized in that, The second drive module adopts an IPM module with a fourth bridge arm, a fifth bridge arm, and a sixth bridge arm; The three-phase input of the outdoor unit is connected to the midpoint of the fourth bridge arm, the midpoint of the fifth bridge arm, and the midpoint of the sixth bridge arm, respectively.

6. The multi-motor drive system according to claim 5, characterized in that, The outdoor unit includes an outdoor fan and a compressor; The noise reduction module includes a third LC filter group connected to each phase input of the external fan and a fourth LC filter group connected to each phase input of the compressor. The three-phase input of the external fan is connected to the midpoint of the fourth arm, the midpoint of the fifth arm, and the midpoint of the sixth arm through the third LC filter group. The three-phase input of the compressor is connected to the side of the third LC filter group near the external fan through the fourth LC filter group.

7. The multi-motor drive system according to claim 6, characterized in that, The third LC filter group includes inductors L7, L8, L9, capacitors C7, C8, and C9. The fourth LC filter group includes inductors L10, L11, L12, capacitors C10, C11, and C12. The first phase input of the external fan is connected in series with the inductor L7 and then connected to the midpoint of the fourth bridge arm. One end of the capacitor C7 is connected between the inductor L7 and the first phase input of the external fan, and the other end of the capacitor C7 is grounded. The second phase input of the external fan is connected in series with the inductor L8 and then connected to the midpoint of the fifth bridge arm. One end of the capacitor C8 is connected between the inductor L8 and the second phase input of the external fan, and the other end of the capacitor C8 is grounded. The third phase input of the external fan is connected in series with the inductor L9 and then connected to the midpoint of the sixth bridge arm. One end of the capacitor C9 is connected between the inductor L9 and the third phase input of the external fan, and the other end of the capacitor C9 is grounded. The first phase input of the compressor is connected in series with the inductor L10 and then connected between the inductor L7 and the first phase input of the external fan. One end of the capacitor C10 is connected between the inductor L10 and the first phase input of the compressor, and the other end of the capacitor C10 is grounded. The second phase input of the compressor is connected in series with the inductor L11 and then connected between the inductor L8 and the second phase input of the external fan. One end of the capacitor C11 is connected between the inductor L11 and the second phase input of the compressor, and the other end of the capacitor C11 is grounded. The third phase input of the compressor is connected in series with the inductor L12 and then connected between the inductor L9 and the third phase input of the external fan. One end of the capacitor C12 is connected between the inductor L12 and the third phase input of the compressor, and the other end of the capacitor C12 is grounded.

8. The multi-motor drive system according to claim 1, characterized in that, The output current of the first drive module is higher than the operating current of the indoor unit; The output current of the second drive module is higher than the operating current of the outdoor unit.

9. The multi-motor drive system according to claim 1, characterized in that, The noise reduction module has a filter inductor and a filter capacitor, wherein the inductive reactance of the filter inductor is greater than the capacitive reactance of the filter capacitor.

10. An all-in-one machine, characterized in that, The integrated device employs the multi-motor drive system as described in any one of claims 1 to 9; The indoor unit includes an indoor fan and a range hood, and the outdoor unit includes an outdoor fan and a compressor.

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