Motor control method and device, unit and air conditioning system

Abstract

The invention provides a motor control method and device, a unit and an air conditioning system. The motor unit can comprise a first motor and a second motor, a motor switching control circuit is additionally arranged, and when the first motor or the second motor is in a running state, whether the power of the motor unit meets a motor switching condition or not can be judged. If it is determined that the power of the motor unit meets the motor switching condition, the started motor in the first motor and the second motor can be turned off, and the motor switching control circuit can be controlled to input motor starting current to the non-started motor in the first motor and the second motor. When the motor unit is composed of motors of different compressors in the compressor unit, through the arrangement of the motor switching control circuit, the motor of another compressor can be quickly started when the compressors need to be switched, so that the switching of the running motors is smoothly completed, and the switching efficiency is improved. And therefore, switching of the running compressors is completed, and the use experience is better improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of air conditioning, and in particular to a motor control method, device, unit and air conditioning system. Background Art

[0002] In the refrigeration industry, with the continuous expansion of the scale and increasing performance requirements of large air-conditioning systems, chillers and various refrigeration systems, the demand for efficient, reliable and flexible refrigeration solutions has become more urgent.

[0003] Traditional single compressor refrigeration systems have gradually exposed many limitations when facing complex and changing load demands. Under low-load conditions, a single compressor is often difficult to operate efficiently. Due to its limited cooling capacity adjustment range, it cannot be accurately adapted according to actual needs, resulting in a significant reduction in energy efficiency, unnecessary energy waste, and increased operating costs. For example, during the night non-business hours of large commercial buildings or the off-season for industrial production, the demand for refrigeration is significantly reduced, but the single compressor still needs to operate at a higher power and cannot flexibly reduce power consumption.

[0004] In addition, the reliability of a single compressor system has obvious shortcomings. Once a compressor fails, the entire refrigeration system will immediately be paralyzed, seriously affecting the comfort of people in large commercial buildings, the normal operation of equipment in data centers, the continuity of industrial production, and the stable environment of medical facilities. This will not only bring direct economic losses, such as interruption of business operations, scrapping of industrial products, and increased risk of medical equipment failure, but may also cause a series of indirect losses, such as customer loss and liquidated damages caused by production delays.

[0005] To overcome these problems, the technology of multiple parallel integrated compressors came into being and has been widely used. By connecting multiple compressors in parallel, this technology achieves flexible response under different load conditions. The system can accurately control the number of compressors turned on according to the actual power demand, effectively avoiding the dilemma of low efficiency of a single compressor at low load, and significantly improving energy efficiency. However, in the actual operation of multiple parallel integrated compressors, when it is necessary to switch compressors, the problem of how to quickly start the motor of another compressor when the pressure difference has not decreased and the load is large is faced. Summary of the invention

[0006] In view of this, in order to solve the technical problem in the prior art of how to quickly start the motor of another compressor when the pressure difference has not yet decreased and the load is large when it is necessary to switch the compressor, the present invention provides a motor control method, device, motor unit, compressor unit and air-conditioning system.

[0007] According to a first aspect of an embodiment of the present disclosure, a motor control method is provided, which is applied to a motor unit, wherein the motor unit includes a first motor, a second motor and a motor switching control circuit, and the motor control method includes:

[0008] When the first motor or the second motor is in a running state, determining whether the power of the motor unit meets the motor switching condition;

[0009] If it is determined that the power of the motor group meets the motor switching condition, the started motor among the first motor and the second motor is turned off, and the motor switching control circuit is controlled to input a motor starting current to the unstarted motor among the first motor and the second motor to complete the switching of the first motor and the second motor.

[0010] In an optional embodiment, the motor switching control circuit includes a first circuit breaker selector, a second circuit breaker, a third circuit breaker selector and a transistor, the first contact of the first circuit breaker selector is electrically connected to the first motor, the second contact of the first circuit breaker selector is electrically connected to the second motor, the first contact of the second circuit breaker selector is electrically connected to the first motor, the second contact of the third circuit breaker selector is electrically connected to the second motor, the first contact of the third circuit breaker selector is electrically connected to the second motor, the second contact of the third circuit breaker selector is electrically connected to the first motor, the third circuit breaker selector is connected to the motor starting current, the emitter of the transistor is electrically connected to the first circuit breaker selector, the collector of the transistor is electrically connected to the second circuit breaker selector, and the output end of the transistor is electrically connected to the ground;

[0011] The controlling the motor switching control circuit to input a motor starting current to the unstarted motor of the first motor and the second motor comprises:

[0012] When the motor unit is controlled to switch from running the first motor to running the second motor, the transistor is controlled to be turned on, and the first circuit breaker selector is controlled to be attracted to its second contact and the third circuit breaker selector is controlled to be attracted to its first contact; and / or,

[0013] When the motor unit is controlled to switch from running the second motor to running the first motor, the transistor is controlled to be disconnected, and the second circuit breaker selector is controlled to be attracted with its first contact, and the third circuit breaker selector is controlled to be attracted with its first contact.

[0014] In an optional implementation, the rated power of the first motor is greater than the rated power of the second motor, and determining that the power of the motor unit meets the motor switching condition includes:

[0015] When the first motor is in the running state and the second motor is in the off state, it is determined that the power of the motor unit is less than the first power, and then it is determined that the power of the motor unit meets the motor switching condition; and / or,

[0016] When the second motor is in the running state and the first motor is in the turned-off state, if it is determined that the power of the motor group is greater than the first power and less than or equal to the second power, it is determined that the power of the motor group meets the motor switching condition; wherein the second power is greater than the first power.

[0017] In an optional embodiment, the motor switching control circuit includes a comparator, the output end of the comparator is electrically connected to the base of the transistor, the first input end of the comparator is connected to the reference voltage, the second input end of the comparator is connected to the bus current of the motor unit through a first resistor, and the power of the motor unit is calculated based on the bus current;

[0018] Wherein, the motor switching control circuit is configured as follows:

[0019] When the power of the motor unit is less than the first power, the output voltage of the comparator causes the transistor to be turned on; and / or,

[0020] When the power of the motor group is greater than the first power, the output voltage of the comparator causes the transistor to be disconnected.

[0021] In an optional implementation, the motor control method includes:

[0022] When both the first motor and the second motor are in an off state, the first motor or the second motor is started based on a magnitude relationship between a first accumulated operating time of the first motor and a second accumulated operating time of the second motor.

[0023] In an optional implementation, starting the first motor or the second motor based on the magnitude relationship between the first accumulated running time of the first motor and the second accumulated running time of the second motor includes:

[0024] If the first accumulated running time is less than the second accumulated running time, starting the first motor; and / or,

[0025] If the first accumulated running time is greater than or equal to the second accumulated running time, the second motor is started.

[0026] In an optional implementation, the rated power of the first motor is greater than the rated power of the second motor, and the motor control method includes:

[0027] When the first motor is in the running state and the second motor is in the shut-down state, if it is determined that the power of the motor assembly is greater than the second power, the second motor is started so that both the first motor and the second motor are in the running state.

[0028] In an optional implementation, the motor control method includes:

[0029] When both the first motor and the second motor are in operation, if it is determined that the first accumulated operation time of the first motor is greater than or equal to the second accumulated operation time of the second motor, the operation frequency of the first motor is reduced and the operation frequency of the second motor is increased.

[0030] In an optional implementation, the motor control method includes:

[0031] When both the first motor and the second motor are in operation, if it is determined that the first accumulated operating time of the first motor is less than the second accumulated operating time of the second motor, the operating frequency of the first motor or the second motor is reduced based on the first temperature of the first motor and the second temperature of the second motor.

[0032] In an optional implementation, reducing the operating frequency of the first motor or the second motor based on the first temperature of the first motor and the second temperature of the second motor includes:

[0033] If it is determined that the first temperature is greater than or equal to the second temperature, reducing the operating frequency of the first motor; and / or,

[0034] If it is determined that the first temperature is lower than the second temperature, the operating frequency of the second motor is reduced.

[0035] According to a second aspect of an embodiment of the present disclosure, a motor control device is provided, which is applied to a motor unit, wherein the motor unit includes a first motor, a second motor and a motor switching control circuit, and the motor control device includes:

[0036] A judging module, used for judging whether the power of the motor group meets the motor switching condition when the first motor or the second motor is in a running state;

[0037] A control module is used to shut down the started motor of the first motor and the second motor if the judgment module determines that the power of the motor group meets the motor switching condition, and control the motor switching control circuit to input a motor starting current to the unstarted motor of the first motor and the second motor to complete the switching of the first motor and the second motor.

[0038] According to a third aspect of an embodiment of the present disclosure, a motor unit is provided, the motor unit comprising a first motor, a second motor and a motor switching control circuit, and also comprising a motor control device as described in the second aspect.

[0039] In an optional embodiment, the motor switching control circuit includes a first circuit breaker selector, a second circuit breaker, a third circuit breaker selector and a transistor, the first contact of the first circuit breaker selector is electrically connected to the first motor, the second contact of the first circuit breaker selector is electrically connected to the second motor, the first contact of the second circuit breaker selector is electrically connected to the first motor, the second contact of the third circuit breaker selector is electrically connected to the second motor, the first contact of the third circuit breaker selector is electrically connected to the second motor, the second contact of the third circuit breaker selector is electrically connected to the first motor, the third circuit breaker selector is connected to the motor starting current, the emitter of the transistor is electrically connected to the first circuit breaker selector, the collector of the transistor is electrically connected to the second circuit breaker selector, and the output end of the transistor is electrically connected to the ground.

[0040] In an optional embodiment, the motor switching control circuit includes a comparator, the output end of the comparator is electrically connected to the base of the transistor, the first input end of the comparator is connected to the reference voltage, the second input end of the comparator is connected to the bus current of the motor unit through a first resistor, and the power of the motor unit is calculated based on the bus current;

[0041] Wherein, the motor switching control circuit is configured as follows:

[0042] When the power of the motor unit is less than the first power, the output voltage of the comparator causes the transistor to be turned on; and / or,

[0043] When the power of the motor group is greater than the first power, the output voltage of the comparator causes the transistor to be disconnected.

[0044] According to a fourth aspect of an embodiment of the present disclosure, a compressor unit is provided, the compressor unit comprising a motor unit as described in any one of the third aspects, the compressor unit comprising a first compressor and a second compressor, the first motor of the motor unit being the motor of the first compressor, and the second motor of the motor unit being the motor of the second compressor.

[0045] According to a fifth aspect of an embodiment of the present disclosure, an air-conditioning system is provided, comprising a compressor unit as described in the fourth aspect.

[0046] The technical solution provided by the embodiment of the present disclosure may include the following beneficial effects: the motor unit in the present disclosure may include the first motor and the second motor, and a motor switching control circuit is newly added, wherein, when the first motor or the second motor is in a running state, that is, when any of the first motor and the second motor is in a running state, it can be determined whether the power of the motor unit meets the motor switching condition. If it is determined that the power of the motor unit meets the motor switching condition, it means that the motor to be switched can be turned off, and the motor that has been started in the first motor and the second motor can be controlled to input the motor starting current to the motor that has not been started in the first motor and the second motor to complete the switching of the first motor and the second motor. For example, when the motor unit is a motor unit composed of motors of different compressors in a compressor unit, through the setting of the above-mentioned motor switching control circuit, it can be well realized that when the compressor needs to be switched, the motor of another compressor can be quickly started, so as to smoothly complete the switching of the running motor, and then complete the switching of the running compressor, so as to better improve the user experience.

[0047] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention.

[0049] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0050] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0051] Figure 1 is a schematic diagram of a motor control method according to an exemplary embodiment.

[0052] Figure 2 is a schematic diagram of a motor control method according to another exemplary embodiment.

[0053] Figure 3 is a schematic diagram of a motor switching control circuit according to an exemplary embodiment.

[0054] Figure 4 It is a schematic diagram of the control principle of a motor switching control circuit according to an exemplary embodiment.

[0055] Figure 5 is a block diagram of a motor control device according to an exemplary embodiment. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, 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 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 making creative work are within the scope of protection of this application.

[0057] The disclosure below provides many different embodiments or examples to implement different schemes of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present invention. In addition, the present invention can repeat reference numbers and / or letters in different examples. This repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0058] For ease of description, spatial relative terms may be used herein to describe the relative positional relationship or movement of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", "front", "back", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure undergoes a position flip or a posture change or a motion state change, then these directional indications also change accordingly, for example: an element described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative descriptors used herein are interpreted accordingly.

[0059] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present application, and thus the drawings only show components related to the present application rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed at will, and the component layout may also be more complicated.

[0060] The following will describe the implementation methods of the present application with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. The present application can also be implemented or applied through other different specific implementation methods, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present application. It should be understood that the preferred embodiments are only for illustrating the present application, not for limiting the scope of protection of the present application.

[0061] In order to solve the technical problem in the prior art of how to quickly start the motor of another compressor when it is necessary to switch the compressor before the pressure difference is reduced and the load is large, the present invention provides a motor control method, device, unit, air-conditioning system and storage medium.

[0062] Among them, the motor unit in the present disclosure may include a first motor and a second motor, and a motor switching control circuit is newly added, wherein, when the first motor or the second motor is in a running state, that is, when any of the first motor and the second motor is in a running state, it can be determined whether the power of the motor unit meets the motor switching condition. If it is determined that the power of the motor unit meets the motor switching condition, it means that the motor to be switched can be turned off, and the motor that has been started in the first motor and the second motor can be controlled to input a motor starting current to the motor that has not been started in the first motor and the second motor to complete the switching of the first motor and the second motor. For example, when the motor unit is a motor unit composed of motors of different compressors in a compressor unit, through the setting of the above-mentioned motor switching control circuit, it can be well realized that when the compressor needs to be switched, the motor of another compressor can be quickly started, thereby smoothly completing the switching of the running motor, and then completing the switching of the running compressor, so as to better improve the user experience.

[0063] In an exemplary embodiment, reference Figures 1 to 4 As shown, a motor control method and a motor unit are provided, and the motor control method can be applied to the motor unit. The motor unit may include a first motor MA and a second motor MB, and a motor switching control circuit. The motor control method may include:

[0064] S110, when the first motor or the second motor is in operation, determining whether the power of the motor unit meets the motor switching condition;

[0065] S120, if it is determined that the power of the motor unit meets the motor switching condition, turning off the motor starting current input to the started motor of the first motor and the second motor, and controlling the motor switching control circuit to input the motor starting current to the unstarted motor of the first motor and the second motor, so as to complete the switching of the first motor and the second motor;

[0066] S130: If it is determined that the power of the motor group does not meet the motor switching condition, the started motor among the first motor and the second motor is maintained in a running state.

[0067] In step S110, when the first motor MA or the second motor MB is in operation, the power of the motor unit can be detected in real time or periodically. Here, the power of the motor unit refers to the input power, which can be determined based on the bus voltage and bus current Iin of the motor unit, or calculated by the input voltage Vin and the front-stage current of the motor unit, or determined based on other methods, which are not limited to this.

[0068] Among them, after the power of the motor unit is detected, it can be determined whether the above power meets the motor switching condition. It should be noted that in this embodiment, the rated power of the first motor MA and the second motor MB are different, and the rated power of the first motor MA is greater than the rated power of the second motor MB, that is, in the first motor MA and the second motor MB, the first motor MA is a high-power motor and the second motor MB is a low-power motor, that is, the output power of the running first motor MA is greater than the output power of the running second motor MB. Based on this, in order to make the power of the motor unit adapt to the corresponding motor, when the power of the motor unit is large, it is more appropriate to run the first motor MA; when the power of the motor unit is small, it is more appropriate to run the second motor MB.

[0069] In this step, the first power P1 can be configured in advance in the motor unit, and by comparing the power of the motor unit (which can be recorded as P) with the first power P1, it can be determined whether the power of the motor unit meets the motor switching condition. It should be noted that the first power P1 can be set according to actual conditions, and its specific value is not limited. After the first power P1 is set, it can also be modified according to actual conditions to better meet different needs.

[0070] In step S120, when the first motor MA or the second motor MB is in the running state, the first motor MA is in the running state and the second motor MB is in the off state, if it is determined that the power of the motor unit is less than the first power P1, it means that it is more appropriate to run the second motor MB at this time, so it can be determined that the power of the motor unit meets the motor switching condition, that is, the power of the motor unit meets the condition of switching the running motor from the first motor MA to the second motor MB. Then, the first motor MA can be turned off, and the motor switching control circuit can be controlled to input the motor starting current Istart to the second motor MB to start the second motor MB, thereby completing the switching of the first motor MA to the second motor MB.

[0071] When the first motor MA or the second motor MB is in the running state, the first motor MA is in the off state and the second motor MB is in the running state, if it is determined that the power of the motor unit is greater than the first power P1 and less than the second power P2, it means that it is more appropriate to run the first motor MA at this time, so it can be determined that the power of the motor unit meets the motor switching condition, that is, the power of the motor unit meets the condition of switching the running motor from the second motor MB to the first motor MA. Then, the second motor MB can be turned off, and the motor switching control circuit can be controlled to input the motor starting current Istart to the first motor MA to start the first motor MA, thereby completing the switching of the second motor MB to the first motor MA.

[0072] It should be noted that the above-mentioned second power P2 is greater than the first power P1, but its specific value is not limited and can be set according to actual needs. The setting method of the second power P2 can refer to the first power P1 and will not be elaborated here. The first power P1 and the second power P2 can be determined based on the adjacent power values ​​of the first motor MA and the second motor MB themselves (which can be approximately considered as 90% of the motor power). By selecting the running motor based on the comparison of the power of the motor unit with the first power P1 and the second power P2, the loss of the motor can be better reduced, thereby extending the service life of the motor.

[0073] If it is determined that the power of the motor unit is greater than or equal to the second power P2, it means that the power of the motor unit is relatively large, and the burden on the motor is relatively large if the first motor MA or the second motor MB is operated alone, so the first motor MA and the second motor MB need to be operated simultaneously. That is, in this case, the first motor MA and the second motor MB can be controlled to be in operation.

[0074] In addition, in this embodiment, the motor switching control circuit may include a first circuit breaker selector QF_D1, a second circuit breaker selector QF_D2, a third circuit breaker selector QF_D3 and a transistor Q.

[0075] Among them, the first contact of the first circuit breaker selector QF_D1 (i.e. Figure 3 D11 in the figure) is electrically connected to the first motor MA, and the second contact of the first circuit breaker selector QF_D1 (i.e., the Figure 3 D12 in the circuit breaker) is electrically connected to the second motor MB, and the first contact of the second circuit breaker selector QF_D2 (i.e. Figure 3 D21 in the circuit breaker) is electrically connected to the first motor MA, and the second contact of the third circuit breaker selector QF_D3 (i.e., the Figure 3 D32 in the circuit breaker) is electrically connected to the second motor MB, and the first contact of the third circuit breaker selector QF_D3 (i.e. Figure 3 D31 in the circuit breaker) is electrically connected to the second motor MB, and the second contact of the third circuit breaker selector QF_D3 (i.e. Figure 3 D22 in the circuit breaker is electrically connected to the first motor MA, and the third circuit breaker selector QF_D3 is connected to the motor starting current Istart. The emitter of the transistor Q is electrically connected to the first circuit breaker selector QF_D1, the collector of the transistor Q is electrically connected to the second circuit breaker selector QF_D2, and the output end of the transistor Q is electrically connected to the ground.

[0076] Among them, when the control motor unit switches from running the first motor MA to running the second motor MB, the transistor Q can be controlled to be turned on, so that the first circuit breaker selector QF_D1 is grounded, and the first circuit breaker selector QF_D1 is controlled to be attracted with its second contact, and the third circuit breaker selector QF_D3 is controlled to be attracted with its first contact, based on which the first motor MA can be turned off, and the motor starting current Istart is transmitted to the second motor MB, thereby starting the second motor MB. It should be noted that in this case, the motor unit can control the second circuit breaker selector QF_D2 to be attracted with its second contact.

[0077] Among them, when the control motor unit switches from running the second motor MB to running the first motor MA, the transistor Q can be controlled to be disconnected to disconnect the ground connection of the first circuit breaker selector QF_D1, and the second circuit breaker selector QF_D2 is controlled to be attracted with its first contact, and the third circuit breaker selector QF_D3 is controlled to be attracted with its first contact. Based on this, the second motor MB can be turned off, and the motor starting current Istart is transmitted to the first motor MA, thereby starting the first motor MA. It should be noted that in this case, the motor unit can control the first circuit breaker selector QF_D1 to be attracted with its first contact.

[0078] In addition, the motor switching control circuit may also include a comparator COMP. The output end of the comparator COMP may be electrically connected to the base of the transistor Q, the first input end of the comparator COMP may be connected to the reference voltage Vref, and the second input end of the comparator COMP may be connected to the bus current Iin of the motor unit through the first resistor R1, and the power of the motor unit is calculated based on the bus current Iin. It should be noted that the bus current Iin can pass through the first resistor R1 so that the second input end of the comparator COMP can obtain an input voltage Vin, and this input voltage Vin corresponds to the power of the motor unit. The reference voltage Vref is the voltage converted from the current corresponding to the first power P1, that is, the reference voltage Vref obtained at the first input end of the comparator COMP corresponds to the first power P1. The voltage at the output end of the comparator COMP can be recorded as the output voltage Vo.

[0079] Based on this, when the power of the motor unit is less than the first power P1, the voltage input to the second input terminal of the comparator COMP is less than the reference voltage Vref input to the first input terminal, and the output terminal of the comparator COMP can output a first output voltage (for example, a high level), and the first output voltage can turn on the transistor Q. Then, in conjunction with the above-mentioned control of the pull-in contacts in the first circuit breaker selector QF_D1, the second circuit breaker selector QF_D2, and the third circuit breaker selector QF_D3, the first motor MA can be turned off, and the motor switching control circuit provides the motor starting current Istart to the second motor MB, so that the second motor MB starts quickly, and the first motor MA can be flexibly switched to the second motor MB.

[0080] When the power of the motor unit is greater than the first power P1, the voltage input to the second input terminal of the comparator COMP is greater than the reference voltage Vref input to the first input terminal, and the output terminal of the comparator COMP can output a second output voltage (e.g., a low level), and the second output voltage can disconnect the transistor Q. Then, in conjunction with the control of the pull-in contacts in the first circuit breaker selector QF_D1, the second circuit breaker selector QF_D2, and the third circuit breaker selector QF_D3, the second motor MB can be turned off, and the motor switching control circuit provides the motor starting current Istart to the first motor MA, so that the first motor MA starts quickly, and the second motor MB can be flexibly switched to the first motor MA.

[0081] In addition, in order to ensure the safety of the motor switching control circuit, the motor switching control circuit may further include a second resistor R2 and a third resistor R3. The second input terminal of the comparator COMP is grounded through the second resistor R2, and the output terminal of the comparator COMP is grounded through the third resistor R3.

[0082] It should be noted that the motor switching control circuit may have other structures besides the structure described above, and this is not limited.

[0083] In step S130 , if it is determined that the power of the motor group does not meet the motor switching condition, the started motor among the first motor MA and the second motor MB is maintained in the running state.

[0084] When the first motor MA or the second motor MB is in the running state, the first motor MA is in the running state and the second motor MB is in the off state, if it is determined that the power of the motor unit is greater than the first power P1 and less than the second power P2, it means that it is more appropriate to run the first motor MA at this time, and there is no need to switch the running motor. It is considered that the power of the motor unit does not meet the motor switching condition, and there is no need to switch the running motor from the first motor MA to the second motor MB, and the first motor MA can continue to be maintained in the running state.

[0085] When the first motor MA or the second motor MB is in the running state, the first motor MA is in the off state and the second motor MB is in the running state, if it is determined that the power of the motor unit is less than the first power P1, it means that it is more appropriate to run the second motor MB at this time, and there is no need to switch the running motor. It is considered that the power of the motor unit does not meet the motor switching condition, and there is no need to switch the running motor from the second motor MB to the first motor MA, and the second motor MB can continue to be maintained in the running state.

[0086] It should be noted that, when any one of the first motor MA and the second motor MB is in operation, if it is determined that the power of the motor unit is greater than or equal to the second power P2, it means that it is more appropriate to operate the first motor MA and the second motor MB at the same time. The running motor does not need to be shut down, and there is no switching of the running motor. It can be considered that the power of the motor unit does not meet the motor switching condition, and the other motor in the shut-down state can be started.

[0087] In this embodiment, by flexibly switching the first motor MA and the second motor MB according to the actual power demand of the motor unit, energy waste caused by the operation of a single motor under inappropriate load conditions is avoided. When the load is low (for example, the power of the motor unit is less than the first power P1), a low-power motor is used, and when the load is high (for example, the rated power of the motor unit is greater than the first power P1), the motor is switched to a high-power motor or two motors are operated at the same time, so that the motor always operates in a higher efficiency range, significantly reducing the energy consumption of the entire motor unit, and meeting the requirements of modern industry and commerce for energy conservation and emission reduction.

[0088] Among them, reasonable motor switching reduces the operating time and load pressure of a single motor and improves the reliability and robustness of the motor unit. For example, the operation of a low-power motor during a low-load period reduces the number of starts and long-term high-load operation time of a high-power motor, thereby reducing the wear and failure risk of the motor and extending the service life of the motor. At the same time, when a motor fails, the motor unit can switch to another motor to ensure the continuous operation of the equipment, improve the reliability of the entire system, and reduce losses such as production interruptions or service stops caused by equipment failures.

[0089] Moreover, in this embodiment, the motor switching control circuit composed of motor unit power detection and comparator COMP, transistor Q and other circuit components realizes intelligent automatic control of motor switching. Without manual intervention, the motor unit can adjust the running motor in real time according to load changes, adapt to various complex working conditions, improve the intelligence level and operation flexibility of the equipment, and reduce operation and maintenance costs and management difficulties.

[0090] Among them, when the motor unit is a motor unit composed of motors of different compressors in the compressor unit, through the setting of the above-mentioned motor switching control circuit, it can be well achieved that when the compressor needs to be switched, the motor of another compressor can be quickly started, thereby smoothly completing the switching of the running motor, and then completing the switching of the running compressor, so as to better improve the user experience.

[0091] In an exemplary embodiment, a motor control method and a motor unit are provided, and the motor control method can be applied to the motor unit. Figures 1 to 4 As shown, the motor unit may include a first motor MA and a second motor MB, and a motor switching control circuit. In the motor control method, when the first motor MA and the second motor MB are both in a closed state, for example, in response to receiving a start control instruction to start the motor unit, the first accumulated running time TA of the first motor MA and the second accumulated running time TB of the second motor MB may be obtained first, and then based on the size relationship between the first accumulated running time TA of the first motor MA and the second accumulated running time TB of the second motor MB, the first motor MA or the second motor MB may be started.

[0092] Among them, if the first cumulative operating time TA is less than the second cumulative operating time TB, it means that the loss of the first motor MA may be less than the loss of the second motor MB. In this case, in order to balance the losses of the two, the first motor MA can be started. If the first cumulative operating time TA is greater than or equal to the second cumulative operating time TB, it means that the loss of the first motor MA may be greater than the loss of the second motor MB. In this case, in order to balance the losses of the two, the second motor MB can be started. It should be noted that when the first cumulative operating time TA is equal to the second cumulative operating time TB, since the first motor MA is a high-power motor and the second motor MB is a low-power motor, it is still considered that the loss of the first motor MA may be greater than the loss of the second motor MB, so the second motor MB can still be started to better balance the losses of the two.

[0093] Among them, after the second motor MB is started based on the accumulated running time but the first motor MA is not started, that is, when the first motor MA is in the off state and the second motor MB is in the running state, the power of the motor unit can be detected, and it is determined whether the power of the motor unit is greater than the first power P1. If it is determined that the power of the motor unit is greater than the first power P1, it means that the first motor MA is more matched with the power input of the motor unit, and the second motor MB can be turned off and the first motor MA can be started; if it is determined that the power of the motor unit is less than or equal to the first power P1, it means that the second motor MB is more matched with the power input of the motor unit, and the first motor MA can be not started, and the second motor MB is maintained in the running state. Then continue to detect the power of the motor unit in real time or periodically.

[0094] Among them, after starting the first motor MA but not starting the second motor MB based on the accumulated running time, that is, when the second motor MB is in the off state and the first motor MA is in the running state, the power of the motor unit can be detected, and it can be determined whether the power of the motor unit is greater than the second power P2. If it is determined that the power of the motor unit is greater than the second power P2, it means that the first motor MA is not enough to match the power input of the motor unit, and it is necessary to continue to start the second motor MB, then the second motor MB can be continued to be started, so that both the first motor MA and the second motor MB are in the running state; if it is determined that the power of the motor unit is less than or equal to the second power P2, it means that there is no need to start the second motor MB, then it can be continued to determine whether the power of the motor unit is greater than the first power P1, and subsequent control can be performed based on the judgment result. Among them, if it is determined that the power of the motor unit is greater than the first power P1, it means that the first motor MA matches the power input of the motor unit, then the second motor MB can be not started, and the first motor MA can be maintained in the running state; if it is determined that the power of the motor unit is less than or equal to the first power P1, then it means that the second motor MB is more matched with the power input of the motor unit, then the first motor MA can be turned off, and the second motor MB can be started. Then continue to detect the power of the motor unit in real time or periodically.

[0095] When both the first motor MA and the second motor MB are in operation, the relationship between the first accumulated operation time TA of the first motor MA and the second accumulated operation time TB of the second motor MB can be determined in real time or periodically.

[0096] Among them, if it is determined that the first cumulative operating time TA is greater than or equal to the second cumulative operating time TB, it means that the loss of the first motor MA may be greater than the loss of the second motor MB, then the operating frequency of the first motor MA can be reduced, and the operating frequency of the second motor MB can be increased, which can not only ensure that the total output power of the first motor MA and the second motor MB matches the power input of the motor unit, but also better balance the losses of the first motor MA and the second motor MB, thereby extending the service life of the entire motor unit. It should be noted that when the first cumulative operating time TA is equal to the second cumulative operating time TB, since the first motor MA is a high-power motor and the second motor MB is a low-power motor, the loss of the first motor MA may still be greater than the loss of the second motor MB. Therefore, in this case, the power of the first motor MA can also be reduced and the power of the second motor MB can be increased to balance the losses of the two.

[0097] Among them, if it is determined that the first accumulated operating time TA is less than the second accumulated operating time TB, the operating frequency of the first motor MA or the second motor MB can be reduced based on the temperature of the first motor MA (recorded as the first temperature tA) and the temperature of the second motor MB (recorded as the second temperature tB).

[0098] If it is determined that the first temperature tA is greater than or equal to the second temperature tB, it means that the loss of the first motor MA may be relatively large, and the operating frequency of the first motor MA may be reduced to balance the losses of the first motor MA and the second motor MB. If it is determined that the first temperature tA is less than the second temperature tB, it means that the loss of the second motor MB may be relatively large, and the operating frequency of the second motor MB may be reduced to balance the losses of the first motor MA and the second motor MB.

[0099] In this embodiment, the loss of the first motor MA and the second motor MB is effectively balanced by adjusting the motor startup and operating frequency strategy based on the accumulated running time and temperature. It avoids premature damage of a motor due to excessive use, significantly extends the overall service life of the motor unit, and improves the reliability and stability of the equipment. In addition, since the motor unit can automatically switch the motor and adjust the operating frequency according to the power demand, it does not require manual intervention and intelligently adapts to various complex load changes. Whether in the air-conditioning system of a commercial building or in the power equipment of industrial production, it can ensure that the equipment operates efficiently under different working conditions, improve energy utilization efficiency, and reduce operating costs. Moreover, this embodiment monitors and analyzes the accumulated running time and temperature of the motor, and realizes the refined operation management of the motor unit. This refined management helps to discover possible problems with the motor in advance, such as predicting the maintenance cycle of the motor through the accumulated running time, and timely discovering the abnormal heating of the motor through temperature monitoring, so as to take corresponding measures to improve the operation and maintenance level and safety of the equipment.

[0100] A motor control device and a motor unit are provided, and the motor control device can be applied to the motor unit, that is, the motor unit can include the above motor control device. In addition, the motor unit can also include a first motor and a second motor, and a motor switching control circuit. The motor control device is used to implement the above motor control method. For example, referring to Figure 5 As shown, the device may include a determination module 10 and a control module 20 .

[0101] A judging module 10, used for judging whether the power of the motor unit meets the motor switching condition when the first motor or the second motor is in operation;

[0102] The control module 20 is used to shut down the started motor among the first motor and the second motor if the judgment module 10 determines that the power of the motor group meets the motor switching condition, and control the motor switching control circuit to input the motor starting current to the unstarted motor among the first motor and the second motor to complete the switching of the first motor and the second motor.

[0103] In an exemplary embodiment, a motor control device and a motor assembly are provided. Figure 3As shown, the motor switching control circuit includes a first circuit breaker selector QF_D1, a second circuit breaker, a third circuit breaker selector QF_D3 and a transistor Q. The first contact of the first circuit breaker selector QF_D1 is electrically connected to the first motor MA, the second contact of the first circuit breaker selector QF_D1 is electrically connected to the second motor MB, the first contact of the second circuit breaker selector QF_D2 is electrically connected to the first motor MA, the second contact of the third circuit breaker selector QF_D3 is electrically connected to the second motor MB, the first contact of the third circuit breaker selector QF_D3 is electrically connected to the second motor MB, the second contact of the third circuit breaker selector QF_D3 is electrically connected to the first motor MA, the third circuit breaker selector QF_D3 is connected to the motor starting current Istart, the emitter of the transistor Q is electrically connected to the first circuit breaker selector QF_D1, the collector of the transistor Q is electrically connected to the second circuit breaker selector QF_D2, and the output end of the transistor Q is electrically connected to the ground.

[0104] In this device, reference Figure 5 As shown, the control module 20 can be used to:

[0105] When the motor unit is controlled to switch from running the first motor to running the second motor, the transistor is controlled to be turned on, and the first circuit breaker selector is controlled to be attracted to its second contact, and the third circuit breaker selector is controlled to be attracted to its first contact; and / or,

[0106] When the motor unit is controlled to switch from running the second motor to running the first motor, the transistor is controlled to be disconnected, and the second circuit breaker selector is controlled to be closed with its first contact, and the third circuit breaker selector is controlled to be closed with its first contact.

[0107] In an exemplary embodiment, a motor control device and a motor unit are provided. The rated power of the first motor is greater than the rated power of the second motor. Figure 5 As shown, the determination module 10 can be used for:

[0108] When the first motor is in the running state and the second motor is in the off state, it is determined that the power of the motor unit is less than the first power, and then it is determined that the power of the motor unit meets the motor switching condition; and / or,

[0109] When the second motor is in the running state and the first motor is in the off state, if it is determined that the power of the motor unit is greater than the first power and less than or equal to the second power, it is determined that the power of the motor unit meets the motor switching condition; wherein the second power is greater than the first power.

[0110] In an exemplary embodiment, a motor control device and a motor assembly are provided. Figure 3As shown, the motor switching control circuit includes a comparator COMP, the output end of the comparator COMP is electrically connected to the base of the transistor Q, the first input end of the comparator COMP is connected to the reference voltage Vref, the second input end of the comparator COMP is connected to the bus current Iin of the motor set through the first resistor R1, and the power of the motor set is calculated based on the bus current Iin;

[0111] Wherein, the motor switching control circuit is configured as follows:

[0112] When the power of the motor unit is less than the first power, the output voltage Vo of the comparator COMP turns on the transistor Q; and / or,

[0113] When the power of the motor set is greater than the first power, the output voltage Vo of the comparator COMP causes the transistor Q to be disconnected.

[0114] In an exemplary embodiment, a motor control device and a motor assembly are provided. Figure 5 As shown, in the device, the control module 20 can be used to:

[0115] When both the first motor and the second motor are in the off state, the first motor or the second motor is started based on a magnitude relationship between a first accumulated operating time of the first motor and a second accumulated operating time of the second motor.

[0116] In an exemplary embodiment, a motor control device and a motor assembly are provided. Figure 5 As shown, in the device, the control module 20 can be used to:

[0117] If the first accumulated running time is less than the second accumulated running time, starting the first motor; and / or,

[0118] If the first accumulated operating time is greater than or equal to the second accumulated operating time, the second motor is started.

[0119] In an exemplary embodiment, a motor control device and a motor unit are provided. The rated power of the first motor is greater than the rated power of the second motor. Figure 5 As shown, in the device, the control module 20 can be used to:

[0120] When the first motor is in the running state and the second motor is in the shut-down state, if it is determined that the power of the motor unit is greater than the second power, the second motor is started, so that both the first motor and the second motor are in the running state.

[0121] In an exemplary embodiment, a motor control device and a motor assembly are provided. Figure 5 As shown, in the device, the control module 20 can be used to:

[0122] When both the first motor and the second motor are in operation, if it is determined that the first accumulated operation time of the first motor is greater than or equal to the second accumulated operation time of the second motor, the operation frequency of the first motor is reduced and the operation frequency of the second motor is increased.

[0123] In an exemplary embodiment, a motor control device and a motor assembly are provided. Figure 5 As shown, in the device, the control module 20 can be used to:

[0124] When both the first motor and the second motor are in operation, if it is determined that the first accumulated operating time of the first motor is less than the second accumulated operating time of the second motor, the operating frequency of the first motor or the second motor is reduced based on the first temperature of the first motor and the second temperature of the second motor.

[0125] In an exemplary embodiment, a motor control device and a motor assembly are provided. Figure 5 As shown, in the device, the control module 20 can be used to:

[0126] If it is determined that the first temperature is greater than or equal to the second temperature, reducing the operating frequency of the first motor; and / or,

[0127] If it is determined that the first temperature is lower than the second temperature, the operating frequency of the second motor is reduced.

[0128] In an exemplary embodiment, an air conditioning system and a compressor unit thereof (not shown in the figure) are provided. That is, the air conditioning system may include a compressor unit. The compressor unit may include the motor unit in the above embodiment. Among them, the compressor unit includes a first compressor and a second compressor. The first motor of the motor unit is the motor of the first compressor, and the second motor of the motor unit is the motor of the second compressor. Based on this, the start-up or operating frequency control of the two compressors of the compressor unit in the air conditioning system can be achieved, so that the air conditioning system and the compressor unit thereof have the same effect as the above motor unit.

[0129] The professionals should also be further aware that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0130] It should be noted that the phrases "one implementation", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification indicate that the described embodiments may include certain features, structures or characteristics, but not every embodiment may include the certain features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing certain features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments, whether explicitly or not explicitly described.

[0131] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or beauty refrigerator that includes a series of elements includes not only those elements, but also other elements that are not explicitly listed, or also includes elements that are inherent to such process, method, article or beauty refrigerator. In the absence of more limitations, the elements defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or beauty refrigerator that includes the elements.

[0132] The above embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Any equivalent substitution or change made by a person skilled in the art based on the present application is within the protection scope of the present application.

Claims

1. A motor control method, characterized in that: Applied to a motor unit, the motor unit includes a first motor, a second motor and a motor switching control circuit, and the motor control method includes: When the first motor or the second motor is in a running state, determining whether the power of the motor unit meets the motor switching condition; If it is determined that the power of the motor group meets the motor switching condition, the started motor among the first motor and the second motor is turned off, and the motor switching control circuit is controlled to input a motor starting current to the unstarted motor among the first motor and the second motor to complete the switching of the first motor and the second motor.

2. The motor control method according to claim 1, characterized in that: The motor switching control circuit comprises a first circuit breaker selector, a second circuit breaker, a third circuit breaker selector and a transistor, wherein the first contact of the first circuit breaker selector is electrically connected to the first motor, the second contact of the first circuit breaker selector is electrically connected to the second motor, the first contact of the second circuit breaker selector is electrically connected to the first motor, the second contact of the third circuit breaker selector is electrically connected to the second motor, the first contact of the third circuit breaker selector is electrically connected to the second motor, the second contact of the third circuit breaker selector is electrically connected to the first motor, the third circuit breaker selector is connected to the motor starting current, the emitter of the transistor is electrically connected to the first circuit breaker selector, the collector of the transistor is electrically connected to the second circuit breaker selector, and the output end of the transistor is electrically connected to the ground; The controlling the motor switching control circuit to input a motor starting current to the unstarted motor of the first motor and the second motor comprises: When the motor unit is controlled to switch from running the first motor to running the second motor, the transistor is controlled to be turned on, and the first circuit breaker selector is controlled to be attracted to its second contact and the third circuit breaker selector is controlled to be attracted to its first contact; and / or, When the motor unit is controlled to switch from running the second motor to running the first motor, the transistor is controlled to be disconnected, and the second circuit breaker selector is controlled to be attracted with its first contact, and the third circuit breaker selector is controlled to be attracted with its first contact.

3. The motor control method according to claim 2, characterized in that: The rated power of the first motor is greater than the rated power of the second motor, and determining that the power of the motor unit meets the motor switching condition includes: When the first motor is in the running state and the second motor is in the off state, it is determined that the power of the motor unit is less than the first power, and then it is determined that the power of the motor unit meets the motor switching condition; and / or, When the second motor is in the running state and the first motor is in the turned-off state, if it is determined that the power of the motor group is greater than the first power and less than or equal to the second power, it is determined that the power of the motor group meets the motor switching condition; wherein the second power is greater than the first power.

4. The motor control method according to claim 3, characterized in that: The motor switching control circuit comprises a comparator, the output end of the comparator is electrically connected to the base of the transistor, the first input end of the comparator is connected to the reference voltage, the second input end of the comparator is connected to the bus current of the motor unit through a first resistor, and the power of the motor unit is calculated based on the bus current; Wherein, the motor switching control circuit is configured as follows: When the power of the motor unit is less than the first power, the output voltage of the comparator causes the transistor to be turned on; and / or, When the power of the motor group is greater than the first power, the output voltage of the comparator causes the transistor to be disconnected.

5. The motor control method according to any one of claims 1 to 4, characterized in that: The motor control method comprises: When both the first motor and the second motor are in an off state, the first motor or the second motor is started based on a magnitude relationship between a first accumulated operating time of the first motor and a second accumulated operating time of the second motor.

6. The motor control method according to claim 5, characterized in that: The starting of the first motor or the second motor based on the magnitude relationship between the first accumulated running time of the first motor and the second accumulated running time of the second motor includes: If the first accumulated running time is less than the second accumulated running time, starting the first motor; and / or, If the first accumulated running time is greater than or equal to the second accumulated running time, the second motor is started.

7. The motor control method according to any one of claims 1 to 4, characterized in that: The rated power of the first motor is greater than the rated power of the second motor, and the motor control method includes: When the first motor is in the running state and the second motor is in the shut-down state, if it is determined that the power of the motor assembly is greater than the second power, the second motor is started so that both the first motor and the second motor are in the running state.

8. The motor control method according to any one of claims 1 to 4, characterized in that: The motor control method comprises: When both the first motor and the second motor are in operation, if it is determined that the first accumulated operation time of the first motor is greater than or equal to the second accumulated operation time of the second motor, the operation frequency of the first motor is reduced and the operation frequency of the second motor is increased.

9. The motor control method according to any one of claims 1 to 4, characterized in that: The motor control method comprises: When both the first motor and the second motor are in operation, if it is determined that the first accumulated operating time of the first motor is less than the second accumulated operating time of the second motor, the operating frequency of the first motor or the second motor is reduced based on the first temperature of the first motor and the second temperature of the second motor.

10. The motor control method according to claim 9, characterized in that: The step of reducing the operating frequency of the first motor or the second motor based on the first temperature of the first motor and the second temperature of the second motor includes: If it is determined that the first temperature is greater than or equal to the second temperature, reducing the operating frequency of the first motor; and / or, If it is determined that the first temperature is lower than the second temperature, the operating frequency of the second motor is reduced.

11. A motor control device, characterized in that: Applied to a motor unit, the motor unit includes a first motor, a second motor and a motor switching control circuit, and the motor control device includes: A judging module, used for judging whether the power of the motor group meets the motor switching condition when the first motor or the second motor is in a running state; A control module is used to shut down the started motor of the first motor and the second motor if the judgment module determines that the power of the motor group meets the motor switching condition, and control the motor switching control circuit to input a motor starting current to the unstarted motor of the first motor and the second motor to complete the switching of the first motor and the second motor.

12. A motor unit, characterized in that: The motor unit includes a first motor, a second motor and a motor switching control circuit, and also includes the motor control device as claimed in claim 11.

13. The motor unit according to claim 12, characterized in that: The motor switching control circuit includes a first circuit breaker selector, a second circuit breaker, a third circuit breaker selector and a transistor, the first contact of the first circuit breaker selector is electrically connected to the first motor, the second contact of the first circuit breaker selector is electrically connected to the second motor, the first contact of the second circuit breaker selector is electrically connected to the first motor, the second contact of the third circuit breaker selector is electrically connected to the second motor, the first contact of the third circuit breaker selector is electrically connected to the second motor, the second contact of the third circuit breaker selector is electrically connected to the first motor, the third circuit breaker selector is connected to the motor starting current, the emitter of the transistor is electrically connected to the first circuit breaker selector, the collector of the transistor is electrically connected to the second circuit breaker selector, and the output end of the transistor is electrically connected to the ground.

14. The motor unit according to claim 13, characterized in that: The motor switching control circuit comprises a comparator, the output end of the comparator is electrically connected to the base of the transistor, the first input end of the comparator is connected to the reference voltage, the second input end of the comparator is connected to the bus current of the motor unit through a first resistor, and the power of the motor unit is calculated based on the bus current; Wherein, the motor switching control circuit is configured as follows: When the power of the motor unit is less than the first power, the output voltage of the comparator causes the transistor to be turned on; and / or, When the power of the motor group is greater than the first power, the output voltage of the comparator causes the transistor to be disconnected.

15. A compressor unit, characterized in that: The compressor unit comprises the motor unit as described in any one of claims 12 to 14, the compressor unit comprises a first compressor and a second compressor, the first motor of the motor unit is the motor of the first compressor, and the second motor of the motor unit is the motor of the second compressor.

16. An air conditioning system, characterized in that: The air conditioning system comprises the compressor unit as claimed in claim 15.

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