Motor anti-reverse-rotation automatic commutation control system and refrigeration equipment
By installing an analog motor and a trigger unit on the three-phase wiring post of the compressor, the wiring phase sequence errors are identified and corrected, the reversal problem caused by the wrong wiring of the compressor is solved, automatic control is realized, and human resource costs are reduced.
Patent Information
- Application Number
- CN202421171460.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-27
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-05-27
AI Technical Summary
In the prior art, the wrong wiring of the compressor will lead to reversal, resulting in waste of human resources and impact on production and use.
Design a motor anti-reversal automatic phase conversion control system. By installing an analog motor and a trigger unit on the three-phase wiring post of the compressor, it can identify the wiring phase sequence errors and adjust the power phase sequence through the inverter to avoid incorrect start-up.
Automatic identification and correction of compressor wiring phase sequence errors is achieved, which avoids compressor reversal and reduces human resources costs.
Smart Images
Figure CN222706415U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a control system for a motor, in particular to a motor anti-reversal automatic phase-changing control system and refrigeration equipment. Background Art
[0002] The three-phase compressor has three terminals, UV and W, inside. The compressor is connected by technicians using power cables. Due to the uncertainty of manual operation, there is a possibility that the power cables are connected incorrectly. If the cables are connected incorrectly, the compressor will reverse, and the wiring needs to be rechecked manually, resulting in a waste of human resources and affecting the production and use of customers.
[0003] Therefore, how to design a motor anti-reverse automatic phase-changing control system and refrigeration equipment that can identify whether the power supply phase sequence is wrong and control the inverter to adjust its power supply phase sequence to avoid incorrect starting of the compressor is a technical problem that the industry urgently needs to solve. Utility Model Content
[0004] Aiming at the problem in the prior art that wrong wiring of the compressor will cause the compressor to reverse, thereby causing a waste of human resources, the utility model proposes a motor anti-reverse automatic phase-changing control system and a refrigeration device.
[0005] The technical solution of the utility model is to propose a motor anti-reverse automatic phase-changing control system, comprising a compressor, a frequency converter connected to the compressor, a simulation motor mounted on a three-phase terminal of the compressor, and a trigger unit connected to an output shaft of the simulation motor;
[0006] The trigger unit can provide a second drive signal to the frequency converter when the simulated motor is reversed, and the frequency converter adjusts its power supply phase sequence when receiving the second drive signal.
[0007] Furthermore, it also includes a control unit connected in series to the three-phase terminals of the simulated motor;
[0008] The control unit is closed when the frequency converter is powered on, and is opened when the simulated motor rotates forward.
[0009] Further, the trigger unit includes a slide bar connected to the output shaft of the simulation motor, and a travel switch arranged on the frequency converter;
[0010] The slide bar rotates forward or reversely along with the output shaft of the simulation motor and triggers the travel switch.
[0011] Furthermore, the travel switch is provided with two, and includes a first travel switch and a second travel switch;
[0012] The first travel switch is triggered only when the slide bar rotates forward along with the output shaft of the simulated motor, and when the first travel switch is triggered, a first driving signal is provided to the frequency converter.
[0013] Furthermore, the second travel switch is triggered only when the slide bar is reversed along with the output shaft of the analog motor, and when the second travel switch is triggered, a second drive signal is provided to the frequency converter.
[0014] Furthermore, the control unit adopts a contactor, and the control end of the contactor is arranged on the frequency converter, and the controlled end of the contactor is arranged on the three-phase terminal of the simulated motor;
[0015] When the frequency converter receives the first driving signal, the controlled end of the contactor is controlled to be disconnected through the control end of the contactor.
[0016] Furthermore, the analog motor is a low-voltage motor, and when the control unit is closed, the frequency converter outputs low-voltage alternating current.
[0017] Furthermore, when the frequency converter receives the first driving signal or adjusts its power supply phase sequence, it outputs high-voltage alternating current that can be used to operate the compressor.
[0018] The utility model also provides a refrigeration device, which is provided with the motor anti-reversal automatic phase-changing control system.
[0019] Furthermore, the refrigeration equipment is an air conditioner.
[0020] Compared with the prior art, the utility model has at least the following beneficial effects:
[0021] The utility model carries a simulation motor on the three-phase terminal of the compressor, so that the connection phase sequence of the simulation motor is completely consistent with the connection phase sequence of the compressor, so as to achieve the effect of simulating the operation of the compressor. At the same time, the simulation motor cooperates with the trigger unit, and can determine whether the connection phase sequence of the compressor is wrong by whether the trigger unit provides the second drive signal to the inverter. When the connection phase sequence of the compressor is wrong, the inverter can adjust the power supply phase sequence, thereby avoiding the wrong start of the compressor and reducing the human resource cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0023] Figure 1 This is a control flow chart of the motor anti-reverse automatic commutation control system in the utility model;
[0024] Figure 2 This is a schematic diagram of the structure of the motor anti-reverse automatic phase-changing control system in the utility model;
[0025] Figure 3 It is a structural schematic diagram of the trigger unit in the utility model. DETAILED DESCRIPTION
[0026] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0027] Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the utility model, rather than implying that each embodiment of the utility model must have the described feature. In addition, it should be noted that this specification describes many features. Although some features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly described. Thus, unless otherwise stated, the described combinations are not intended to be limiting.
[0028] The principle and structure of the present utility model are described in detail below with reference to the accompanying drawings and embodiments.
[0029] The three-phase compressor has three terminals, UV and W, inside. The compressor is connected by technicians using power cables. Due to the uncertainty of manual operation, there is a possibility that the power cables are connected incorrectly. If the cables are connected incorrectly, the compressor will reverse, and the wiring needs to be rechecked manually, resulting in a waste of human resources and affecting the production and use of customers.
[0030] In view of the above problems, the utility model proposes a motor anti-reverse automatic phase-changing control system. The design idea is to install a simulation motor on the three-phase terminal of the compressor. The forward and reverse rotation of the simulation motor can reflect whether the wiring phase sequence of the compressor is correct. At the same time, when the simulation motor reflects that the wiring phase sequence of the compressor is wrong, it provides a corresponding drive signal for the inverter to adjust its power supply phase sequence, thereby avoiding the problem of incorrect startup of the compressor and reducing human resource costs.
[0031] Based on the above design ideas, the motor anti-reverse automatic phase-changing control system proposed by the utility model includes: a compressor, a frequency converter, an analog motor, and a trigger unit;
[0032] Here, the compressor and the inverter are conventional components in refrigeration equipment. For air conditioners, the compressor converts low-temperature and low-pressure gaseous refrigerant into high-temperature and high-pressure gaseous refrigerant.
[0033] The frequency converter is connected to the compressor to provide three-phase AC power to the compressor to ensure the normal operation of the compressor;
[0034] The simulation motor is mainly used to simulate the connection between the compressor and the inverter. By simulating the forward and reverse rotation of the motor, the forward and reverse rotation of the compressor when it is powered on can be reflected. In the utility model, the simulation motor is mounted on the three-phase terminal of the compressor. Since the three-phase terminal of the compressor is directly connected to the power supply of the inverter, the connection phase sequence of the simulation motor will be completely consistent with the connection phase sequence of the compressor under this connection mode, which can be used to reflect whether the connection phase sequence of the compressor is wrong.
[0035] The trigger unit is connected to the output shaft of the analog motor, and is mainly used to obtain the forward and reverse rotation of the analog motor and send out a corresponding drive signal. In the utility model, when the analog motor rotates forward, the trigger unit will send out a first drive signal to the inverter, informing the inverter that the wiring phase sequence of the compressor is correct at this time;
[0036] When simulating motor reversal, the trigger unit will send a second drive signal to the inverter, informing the inverter that the wiring phase sequence of the compressor is wrong at this time. At this time, the inverter needs to change its power phase sequence and change the reverse rotation to forward rotation, so as to avoid the reversal problem of the compressor due to the wrong wiring phase sequence when the power is turned on.
[0037] like Figure 2 As shown, it is a schematic diagram of the structure of the motor anti-reverse automatic phase change control system in the utility model, M1 is an analog motor, M2 is a compressor, U, V, W are three-phase terminals, L1, L2, L3 are inverter power supplies, Figure 1 It can be seen that the three-phase terminals of the simulated motor and the three-phase terminals of the compressor are connected together and both are connected to the inverter power supply. It can be clearly seen from the above connection method that the wiring phase sequence of the simulated motor to the inverter power supply is completely consistent with the wiring phase sequence of the compressor to the inverter power supply, so the wiring phase sequence of the compressor can be reflected by the simulated motor.
[0038] That is, from the above introduction, it can be clearly found that after the above configuration, the utility model can identify whether the wiring phase sequence of the compressor is wrong, and when the wiring phase sequence of the compressor is wrong, the power supply phase sequence is adjusted by the frequency converter, which can avoid the reversal problem of the compressor caused by the wrong wiring phase sequence.
[0039] Furthermore, the motor anti-reverse automatic phase-changing control system proposed by the utility model also includes a control unit connected in series to the three-phase terminal of the simulated motor;
[0040] The control unit is closed when the inverter is powered on and is opened when simulating forward rotation of the motor.
[0041] Here we need to explain the working principle of the simulated motor. Since the simulated motor and the compressor are connected to the inverter power supply together, when the inverter voltage power supply is powered, the simulated motor and the compressor will be powered on together. However, if the compressor is started when the simulated motor is started, the simulation effect cannot be achieved. Only when the compressor is not started, the simulated motor is started first, and the forward and reverse rotation of the simulated motor is used to reflect the wiring phase sequence of the compressor, can the corresponding simulation situation be achieved.
[0042] To this end, the simulated motor provided in the utility model is a low-voltage motor, which can be started only when the frequency converter outputs low-voltage AC power, while the compressor requires the frequency converter to output high-voltage AC power to start. Based on the above design, the utility model first outputs low-voltage AC power when the frequency converter is powered on to ensure that only the simulated motor works in this case, and the wiring phase sequence of the compressor is reflected by the forward and reverse rotation of the simulated motor.
[0043] After the forward and reverse rotation of the simulated motor reflects the wiring phase sequence of the compressor, if it indicates that the wiring phase sequence of the compressor is correct, or the wiring phase sequence of the compressor is wrong, and the inverter has adjusted its power phase sequence, the inverter can normally output high-voltage AC power to supply the compressor. However, in this case, the high-voltage AC power provided by the inverter will still flow to the simulated motor, which will cause some energy waste and may even damage the simulated motor due to excessive voltage.
[0044] To this end, the utility model relates to the above-mentioned control unit, which is guaranteed to be closed when the frequency converter is powered on, that is, closed when the frequency converter outputs low-voltage AC power, to ensure normal power-on of the analog motor;
[0045] At the same time, the control unit ensures that when the simulated motor rotates forward, that is, the wiring phase sequence of the compressor is correct, the inverter is disconnected when it wants to output high-voltage AC power, thereby avoiding energy waste caused by the simulated motor and damage to the simulated motor due to excessive voltage.
[0046] Furthermore, the trigger unit proposed in the utility model includes a slide bar connected to the output shaft of the analog motor, and a travel switch arranged on the frequency converter;
[0047] The slide bar can rotate forward or reverse along with the output shaft of the simulated motor and trigger the corresponding travel switch.
[0048] As mentioned above, after setting up the simulated motor, the forward and reverse rotation of the simulated motor can be used to reflect whether the wiring phase sequence of the compressor is correct. However, in order to realize the inverter's recognition of the wiring phase sequence of the compressor and automatic phase change of the power supply phase sequence, it is also necessary to convert the forward and reverse rotation of the simulated motor into corresponding drive signals and provide them to the inverter, thereby informing the inverter of the forward and reverse rotation of the simulated motor, that is, whether the wiring phase sequence of the compressor is correct.
[0049] To this end, the utility model is provided with the above-mentioned slide bar and travel switch, and two corresponding travel switches are provided and are arranged on the frequency converter. The slide bar is provided on the output shaft of the analog motor to ensure that the analog motor can drive the slide bar to move when it rotates forward or reversely. The slide bar rotates with the output shaft of the compressor, thereby triggering different travel switches. Since the travel switch is provided on the frequency converter, it can sense the triggering condition of the travel switch. According to the different triggering conditions of the travel switch, the frequency converter can know the forward and reverse rotation conditions of the analog motor at this time, that is, whether the wiring phase sequence of the compressor is correct at this time.
[0050] To sum up, the utility model can convert the forward and reverse rotation of the simulated motor into the corresponding first drive signal and the second drive signal through the setting of the above-mentioned sliding rod and the travel switch, so as to inform the frequency converter, so as to know whether the wiring phase sequence of the compressor is correct, thereby realizing the frequency converter's recognition of the wiring phase sequence of the compressor and the automatic phase change function of the power supply phase sequence.
[0051] Specifically, the utility model has two travel switches, namely a first travel switch and a second travel switch;
[0052] The first travel switch is triggered only when the slide bar rotates forwardly along with the output shaft of the simulated motor, and when the first travel switch is triggered, a first driving signal is provided to the frequency converter.
[0053] Here, the first travel switch is arranged on the frequency converter, and its function is to provide a first driving signal to inform that the simulated motor is rotating forward at this time, and correspondingly, the connection phase sequence of the compressor is correct at this time.
[0054] Furthermore, the second travel switch in the utility model is triggered only when the slide bar rotates reversely along with the output shaft of the simulated motor, and when the second travel switch is triggered, a second drive signal is provided to the frequency converter.
[0055] Here, the second travel switch is arranged on the frequency converter, and its function is to provide a second driving signal to inform that the simulated motor is in reverse rotation at this time, and correspondingly, the wiring phase sequence of the compressor is wrong at this time.
[0056] See also Figure 2 and Figure 3, switch SQ1 is the first travel switch, switch SQ2 is the second travel switch, Figure 2 It can be seen that the first travel switch and the second travel switch are both arranged on the frequency converter. Since the first travel switch and the second travel switch provide different signals to the frequency converter when they are opened and closed (generally, the difference between high level and low level), the utility model can determine the forward and reverse rotation of the simulated motor at this time through the triggering conditions of the first travel switch and the second travel switch, that is, their on and off states, and further know whether the wiring phase sequence of the compressor is correct.
[0057] like Figure 3 As shown, the slide bar is arranged on the output shaft of the analog motor, and the two ends of the slide bar are respectively arranged at the first travel switch and the second travel switch. When the analog motor rotates forward, the slide bar will rotate clockwise along with the output shaft of the analog motor. At this time, the slide bar will trigger the corresponding first travel switch, and the frequency converter can receive the corresponding first drive signal.
[0058] When the analog motor reverses, the slide bar will rotate counterclockwise along with the output shaft of the analog motor. At this time, the slide bar will trigger the corresponding second travel switch, and the frequency converter can receive the corresponding second drive signal.
[0059] That is, in the utility model, through the setting of the above-mentioned sliding rod and the travel switch, the forward and reverse rotation of the simulated motor can be converted into the corresponding first drive signal and the second drive signal to inform the frequency converter, so as to know whether the wiring phase sequence of the compressor is correct, thereby realizing the frequency converter's recognition of the wiring phase sequence of the compressor and the automatic phase change function of the power supply phase sequence.
[0060] Furthermore, in the utility model, the control unit adopts a contactor, and the control end of the contactor is arranged on the frequency converter, and the controlled end of the contactor is arranged on the three-phase terminal of the simulated motor;
[0061] When the frequency converter receives the first driving signal, the controlled end of the contactor is controlled to be disconnected through the control end of the contactor.
[0062] Here, when the inverter receives the first drive signal, that is, the simulated motor rotates forward, and the wiring phase sequence of the compressor is correct, high-voltage AC power needs to be provided to the compressor through the inverter. As mentioned above, in order to avoid energy waste caused by the simulated motor and damage to the simulated motor due to excessive voltage, the controlled end of the contactor needs to be disconnected at this time to prevent the simulated motor from drawing power.
[0063] like Figure 2As shown, KM1 is a contactor, and the KM1 in the dotted frame at the analog motor is the controlled end of the contactor, and the KM1 on the frequency converter is the control end of the contactor, so that the utility model can control the access status of the analog motor through the frequency converter.
[0064] From this Figure 2 It can be clearly found that the controlled end of the contactor has three switches, which are connected in series to the three-phase terminals of the simulated motor. Therefore, after the controlled end of the contactor is disconnected, the three-phase terminals of the simulated motor will not be able to be powered on, that is, they are in a disconnected state.
[0065] There are two situations in which the controlled end of the contactor is disconnected in the utility model. The first situation is that the frequency converter receives the first drive signal, indicating that the simulated motor is rotating forward at this time, that is, the wiring phase sequence of the compressor is correct at this time, and the frequency converter needs to output high-frequency AC power to power the compressor. At this time, in order to avoid energy waste caused by the simulated motor and damage to the simulated motor due to excessive voltage, the controlled end of the contactor needs to be disconnected, thereby preventing the simulated motor from taking power;
[0066] The second situation is that after the inverter receives the second drive signal and changes the power phase sequence of the inverter, the power phase sequence of the inverter is changed, and the compressor can be powered normally without the compressor reversing. At this time, the inverter outputs high-frequency AC power. In order to avoid energy waste caused by the simulated motor and damage to the simulated motor due to excessive voltage, the controlled end of the contactor needs to be disconnected to prevent the simulated motor from drawing power.
[0067] The utility model adopts contactor for control, which has the following advantages:
[0068] It has fast action, stable operation, long service life and small size. It can be widely used in power protection, automation, sports, remote control, measurement and communication devices.
[0069] It should be pointed out that the contactor is only a setting in a preferred embodiment of the utility model. In other embodiments of the utility model, other control switches can also be used to achieve the above effects. It only needs to meet the two conditions described above to disconnect the simulated motor, which should be within the protection scope of the utility model.
[0070] Furthermore, the simulation motor in the utility model adopts a low-voltage motor, and when the control unit is closed, the frequency converter outputs low-voltage alternating current.
[0071] As mentioned above, the simulation motor in the utility model adopts a low-voltage motor, which can be started only when the frequency converter outputs low-voltage AC power, while the compressor requires the frequency converter to output high-voltage AC power to start. Based on the above design, the utility model first outputs low-voltage AC power when the frequency converter is powered on to ensure that only the simulation motor works in this case, and the forward and reverse rotation of the simulation motor is used to reflect the wiring phase sequence of the compressor.
[0072] That is, through the above arrangement, the utility model can ensure that the simulated motor is normally used to reflect the wiring phase sequence of the compressor, avoiding the problem that the simulated motor and the compressor are powered on and work together, but cannot simulate the operation of the compressor.
[0073] Furthermore, the frequency converter in the utility model outputs high-voltage alternating current that can be used to operate the compressor when receiving the first driving signal or adjusting its power supply phase sequence.
[0074] The inverter outputs high voltage AC power in the following two situations:
[0075] The first case is that the inverter receives the first drive signal, indicating that the simulated motor is rotating forward at this time, that is, the wiring phase sequence of the compressor is correct at this time, and the inverter needs to output high-frequency AC power to power the compressor. At this time, in order to avoid energy waste caused by the simulated motor and damage to the simulated motor due to excessive voltage, the controlled end of the contactor needs to be disconnected to prevent the simulated motor from taking power;
[0076] The second situation is that after the inverter receives the second drive signal and changes the power phase sequence of the inverter, the power phase sequence of the inverter is changed, and the compressor can be powered normally without the compressor reversing. At this time, the inverter outputs high-frequency AC power. In order to avoid energy waste caused by the simulated motor and damage to the simulated motor due to excessive voltage, the controlled end of the contactor needs to be disconnected to prevent the simulated motor from drawing power.
[0077] This setting is used to ensure that the compressor can start and run normally, avoiding the reversal problem caused by the wrong wiring phase sequence of the compressor.
[0078] See also Figure 1 , which is a control flow chart of the motor anti-reverse automatic commutation control system in the utility model;
[0079] After the inverter is turned on, it first outputs low-voltage AC power to the analog motor through the inverter;
[0080] This step is as mentioned above. It is used to reflect whether the wiring phase sequence of the compressor is correct by simulating the motor. As for the output of low-voltage AC power, it is used to ensure that only the simulated motor is running at this time, and the compressor will not run;
[0081] After the analog motor is powered, it will drive the slider to move;
[0082] There are two working conditions at this time. The first condition is that the simulated motor rotates forward. At this time, the simulated motor drives the slider to move forward (that is, the clockwise rotation mentioned above). This part of the action corresponds to the attached Figure 1 Middle left half of the process;
[0083] The second case is when the simulated motor reverses. At this time, the simulated motor drives the slider to move in the opposite direction (that is, the counterclockwise rotation mentioned above). This part of the action corresponds to the attached Figure 1 The middle right half of the process;
[0084] The first case is described below:
[0085] In this case, the slide bar will move forward and reach the position, and then trigger the travel switch SQ1;
[0086] As mentioned above, the travel switch SQ1 is set on the inverter, and when it is triggered, it will send a first drive signal to the inverter. After the inverter receives the first drive signal, it can identify that the simulated motor is rotating forward at this time, and at the same time know that the wiring phase sequence of the compressor is correct at this time;
[0087] The inverter will then perform the following actions:
[0088] The inverter controls the contactor to reset the analog motor and travel switch SQ1; at the same time, it controls the inverter to boost operation;
[0089] Here, the inverter contactor resets the simulated motor by power failure, which is achieved by the contactor as described above. By controlling the controlled end of the contactor to disconnect, the simulated motor can be powered off.
[0090] The power-off reset of the travel switch SQ1 is used to ensure the normal execution of the next detection, which can be directly controlled by the inverter;
[0091] The inverter boost operation is used to output high-voltage AC power to ensure the normal start-up of the compressor at this time.
[0092] The following is an explanation of the second situation:
[0093] In this case, the slide bar will move in the opposite direction and reach the position, then trigger the travel switch SQ2;
[0094] As mentioned above, the travel switch SQ2 is set on the inverter, and when it is triggered, it will send a second drive signal to the inverter. After the inverter receives the second drive signal, it can identify that the simulated motor is reversed at this time, and at the same time know that the wiring phase sequence of the compressor is wrong at this time;
[0095] The inverter will then perform the following actions:
[0096] The inverter controls the contactor to reset the analog motor and travel switch SQ2;
[0097] The inverter automatically identifies and adjusts the power phase sequence and then runs at a higher voltage;
[0098] Here, the inverter contactor resets the simulated motor by power failure, which is achieved by the contactor as described above. By controlling the controlled end of the contactor to disconnect, the simulated motor can be powered off.
[0099] The power-off reset of the travel switch SQ2 is used to ensure the normal execution of the next detection, which can be directly controlled by the inverter;
[0100] The inverter automatically identifies and adjusts the power phase sequence because it recognizes that the wiring phase sequence of the compressor is wrong. If the power is supplied directly, the compressor will be reversed. Therefore, the power phase sequence needs to be adjusted before power can be supplied.
[0101] The inverter boost operation is used to output high-voltage AC power to ensure the normal start-up of the compressor at this time.
[0102] Based on the above configuration, the present invention has the following beneficial effects compared with the prior art:
[0103] The utility model carries a simulation motor on the three-phase terminal of the compressor, so that the connection phase sequence of the simulation motor is completely consistent with the connection phase sequence of the compressor, so as to achieve the effect of simulating the operation of the compressor. At the same time, the simulation motor cooperates with the trigger unit, and can determine whether the connection phase sequence of the compressor is wrong by whether the trigger unit provides the second drive signal to the inverter. When the connection phase sequence of the compressor is wrong, the inverter can adjust the power supply phase sequence, thereby avoiding the wrong start of the compressor and reducing the human resource cost.
[0104] The utility model also provides a refrigeration device, which is provided with the motor anti-reversal automatic phase-changing control system.
[0105] Furthermore, the above-mentioned refrigeration equipment is an air conditioner.
[0106] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A motor anti-reverse automatic phase-changing control system, comprising a compressor and a frequency converter connected to the compressor, characterized in that: It also includes a simulation motor mounted on the three-phase terminal of the compressor, and a trigger unit connected to the output shaft of the simulation motor; The trigger unit can provide a second drive signal to the frequency converter when the simulated motor is reversed, and the frequency converter adjusts its power supply phase sequence when receiving the second drive signal.
2. The motor anti-reverse automatic commutation control system according to claim 1, characterized in that: It also includes a control unit connected in series to the three-phase terminals of the simulated motor; The control unit is closed when the frequency converter is powered on, and is opened when the simulated motor rotates forward.
3. The motor anti-reverse automatic commutation control system according to claim 2, characterized in that: The trigger unit includes a slide bar connected to the output shaft of the analog motor and a travel switch arranged on the frequency converter; The slide bar rotates forward or reversely along with the output shaft of the simulation motor and triggers the travel switch.
4. The motor anti-reverse automatic commutation control system according to claim 3, characterized in that: The travel switches are provided with two, including a first travel switch and a second travel switch; The first travel switch is triggered only when the slide bar rotates forward along with the output shaft of the simulated motor, and when the first travel switch is triggered, a first driving signal is provided to the frequency converter.
5. The motor anti-reverse automatic phase-changing control system according to claim 4, characterized in that: The second travel switch is triggered only when the slide bar rotates reversely along with the output shaft of the analog motor, and when the second travel switch is triggered, a second drive signal is provided to the frequency converter.
6. The motor anti-reverse automatic commutation control system according to claim 4, characterized in that: The control unit adopts a contactor, and the control end of the contactor is arranged on the frequency converter, and the controlled end of the contactor is arranged on the three-phase terminal of the simulated motor; When the frequency converter receives the first driving signal, the controlled end of the contactor is controlled to be disconnected through the control end of the contactor.
7. The motor anti-reverse automatic commutation control system according to claim 2, characterized in that: The analog motor is a low-voltage motor, and when the control unit is closed, the frequency converter outputs low-voltage alternating current.
8. The motor anti-reverse automatic commutation control system according to claim 1, characterized in that: The frequency converter outputs high-voltage alternating current that can be used to operate the compressor when receiving the first driving signal or after adjusting its power supply phase sequence.
9. A refrigeration device, characterized in that: The refrigeration equipment has a motor anti-reverse automatic phase-changing control system as claimed in any one of claims 1 to 8.
10. The refrigeration device according to claim 9, characterized in that: The refrigeration equipment is an air conditioner.