A motor drive circuit

Abstract

The application discloses a motor driving circuit and relates to the technical field of motor driving. The motor driving circuit comprises a motor driving module, a first control module and a second control module. The motor driving module comprises an inverter module, a first driving module and a second driving module. The first driving module is used for driving a first motor or a second motor, and the second driving module is used for driving the second motor. The second control module is used for controlling the connection relationship between the inverter module and the first motor and the second motor, so that the first driving module switches the driving object to the second motor. The motor driving circuit disclosed in the embodiment of the application can switch the contact of a relay, and when the inverter needs to be overhauled or a fault occurs, another set of inverters can be used to drive the motor that needs to be protected, so that the continuous operation effect of the motor is maintained.

Description

Technical Field

[0001] This application relates to the field of motor drive technology, and in particular to a motor drive circuit. Background Technology

[0002] Variable frequency drives (VFDs) are crucial components in energy-saving products, commonly used to drive motors. However, their motor driving method is limited. Typically, the inverter in a VFD drives the motor in a one-to-one manner. When the inverter needs maintenance or malfunctions, the motor must be stopped before maintenance can be performed. Stopping the motor disrupts the normal operation of the system and affects the operation of industrial equipment. Therefore, there is an urgent need for a motor drive circuit to address these issues. Utility Model Content

[0003] To address the problem of motor shutdown caused by inverter failure or maintenance in existing technologies, this application provides the following technical solution:

[0004] Provide a motor drive circuit,

[0005] It includes: a motor drive module, a first control module, and a second control module; the motor drive module is electromagnetically connected to the first control module and the second control module, and the first control module and the second control module are electromagnetically connected.

[0006] The motor drive module includes an inverter module, a first drive module, and a second drive module. The inverter module is connected to the first drive module and the second drive module respectively. The first drive module is used to drive a first motor or a second motor, and the second drive module is used for the second motor.

[0007] The first control module is used to control the connection relationship between the inverter module and the first motor and the second motor, so that the first drive module drives the first motor and the second drive module drives the second motor;

[0008] The second control module is used to control the connection relationship between the inverter module and the first motor and the second motor, so that the first drive module can switch the drive object to the second motor.

[0009] Furthermore,

[0010] The motor drive module includes several relay contacts;

[0011] The first control module includes a first power port, a second power port, and a first switch branch, a first control branch, and a second control branch connected in parallel between the first power port and the second power port. The first control module includes a second switch contact, a plurality of relay contacts, and a coil.

[0012] The second control module includes a third power port and a fourth power port, and a second switch branch, a third control branch, a fourth control branch, a fifth control branch, a sixth control branch and a seventh control branch connected in parallel between the third power port and the fourth power port. The second control module includes a first switch, a plurality of relay contacts and a coil.

[0013] The closed state of the second switch contact in the first control module responds to the first external command, and the closed state of the relay contact in the motor drive module responds to the closed state of the second switch contact, so as to control the inverter module to be connected to the first motor and the second motor respectively, so that the first drive module can drive the first motor and the second drive module can drive the second motor;

[0014] The closed state of the second switch contact in the first control module and the closed state of the first switch in the second control module respond to the second external command. The closed state of the relay contact in the motor drive module responds to the closed state of the second switch contact and the closed state of the first switch, so as to control the inverter module to connect with the second motor. The inverter module is disconnected from the first motor so that the first drive module can switch the drive object to the second motor.

[0015] Furthermore, the motor drive module also includes a voltage input port and a common port; the inverter module is connected to the voltage input port, and the inverter module is connected to both the first drive module and the second drive module. The first drive module is connected to the common port, and the second drive module is connected to the common port.

[0016] Furthermore, the motor drive module also includes: a first relay contact, a second relay contact, a third relay contact, a fourth relay contact, a first contact of a fifth relay, a first contact of a sixth relay, and a first contact of a seventh relay;

[0017] The inverter module has: an inverter module first port, an inverter module second port, an inverter module third port, an inverter module fourth port, and an inverter module fifth port;

[0018] The first driving module has: a first driving module first port, a first driving module second port, and a first driving module third port;

[0019] The second drive module has: a first port of the second drive module, a second port of the second drive module, and a third port of the second drive module;

[0020] The first port of the inverter module is connected to the voltage input port. The second port of the inverter module is connected to the first port of the first drive module. The third port of the inverter module is connected to the first port of the second drive module. The second port of the first drive module is connected to the common port after being connected in series with the first relay contact. The third port of the first drive module is connected to the common port after being connected in series with the second relay contact. The second port of the second drive module is connected to the common port after being connected in series with the third relay contact. The third port of the second drive module is connected to the common port after being connected in series with the fourth relay contact. One end of the first contact of the fifth relay is connected in series with one end of the first contact of the seventh relay and then connected to the fourth port of the inverter module. The other end of the first contact of the seventh relay is used to connect to the first motor. The fifth port of the inverter module is connected to one end of the first contact of the sixth relay. The other end of the first contact of the sixth relay is connected to the other end of the first contact of the fifth relay and then used to connect to the second motor.

[0021] Furthermore, the inverter module includes: a first inverter and a second inverter;

[0022] The first inverter has: a first inverter input port, a first inverter output port, and a first inverter controlled port;

[0023] The second inverter has: a second inverter input port, a second inverter output port, and a second inverter controlled port;

[0024] The first inverter input port is connected to the second inverter input port and serves as the first port of the inverter module. The first inverter output port serves as the fourth port of the inverter module. The first inverter controlled port serves as the second port of the inverter module. The second inverter output port serves as the fifth port of the inverter module. The second inverter controlled port serves as the third port of the inverter module.

[0025] Furthermore, the first drive module includes: a first inverter controller and a first encoder;

[0026] The first inverter controller has: a first inverter controller first port, a first inverter controller second port, and a first inverter controller third port;

[0027] The first encoder has: a first encoder first port and a first encoder second port;

[0028] The first port of the first inverter controller is connected to the first port of the first encoder, the second port of the first inverter controller serves as the second port of the first drive module, the third port of the first inverter controller serves as the first port of the first drive module, and the second port of the first encoder serves as the third port of the first drive module.

[0029] Furthermore, the second drive module includes: a second inverter controller and a second encoder;

[0030] The second inverter controller has: a first port of the second inverter controller, a second port of the second inverter controller, and a third port of the second inverter controller;

[0031] The second encoder has: a first port of the second encoder and a second port of the second encoder;

[0032] The first port of the second inverter controller is connected to the first port of the second encoder, the second port of the second inverter controller serves as the second port of the second drive module, the third port of the second inverter controller serves as the first port of the second drive module, and the second port of the second encoder serves as the third port of the second drive module.

[0033] Furthermore, the first switch branch includes: a first contact of the second switch, a first contact of the ninth relay, a second contact of the sixth relay, a second contact of the seventh relay, and a coil of the fifth relay;

[0034] The first contact of the second switch, the first contact of the ninth relay, the second contact of the sixth relay, the second contact of the seventh relay, and the coil of the fifth relay are connected in series to form the first switch branch.

[0035] Furthermore, the first control branch includes: a second contact of a second switch, a second contact of a ninth relay, a second contact of a fifth relay, and a coil of a sixth relay;

[0036] The second contact of the second switch, the second contact of the ninth relay, the second contact of the fifth relay, and the coil of the sixth relay are connected in series to form the first control branch.

[0037] Furthermore, the second control branch includes: the third contact of the second switch, the third contact of the ninth relay, the third contact of the fifth relay, and the coil of the seventh relay;

[0038] The third contact of the second switch, the third contact of the ninth relay, the third contact of the fifth relay, and the coil of the seventh relay are connected in series to form the second control branch.

[0039] Furthermore, the second switch branch is obtained by connecting the first switch and the coil of the ninth relay in series;

[0040] The third control branch is obtained by connecting the coil of the eighth relay and the third contact of the seventh relay in series;

[0041] The fourth control branch is obtained by connecting the first contact of the eighth relay and the coil of the first relay in series.

[0042] The fifth control branch is obtained by connecting the second contact of the eighth relay and the coil of the second relay in series.

[0043] The sixth control branch is obtained by connecting the third contact of the eighth relay and the coil of the third relay in series.

[0044] The seventh control branch is obtained by connecting the fourth contact of the eighth relay and the coil of the fourth relay in series.

[0045] By implementing a motor drive circuit described in the embodiments of this application, the second control module switches the drive of different motors. When the drive module of the second motor needs maintenance or malfunctions, the drive module of the first motor can drive the second motor that needs protection, thereby maintaining the continuous operation of the second motor. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of the motor drive module provided in an embodiment of this application;

[0048] Figure 2 This is a schematic diagram of the first control module provided in an embodiment of this application;

[0049] Figure 3 This is a schematic diagram of the second control module provided in an embodiment of this application. Detailed Implementation

[0050] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0051] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an,” “a,” or “the,” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The numbers in the accompanying drawings are only used to distinguish individual functional parts or modules and do not indicate logical relationships between parts or modules. The terms “comprising,” “including,” or “including,” and similar terms mean that the element or object preceding the term encompasses the element or object listed following the term and its equivalents, without excluding other elements or objects. The terms “connected,” “linked,” and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. “Above,” “below,” “left,” “right,” etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0052] The various embodiments according to this disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that in the drawings, the same reference numerals are assigned to components having substantially the same or similar structure and function, and repeated descriptions of them will be omitted.

[0053] To address the problem of motor shutdown caused by inverter failure or maintenance in existing technologies, this application provides the following technical solution:

[0054] In some embodiments, such as Figure 1 - Figure 3 As shown, a motor drive circuit is provided, including: a motor drive module 1, a first control module 2, and a second control module 3; the motor drive module 1 is electromagnetically connected to the first control module 2 and the second control module 3, and the first control module 2 and the second control module 3 are also electromagnetically connected.

[0055] It should be noted that the motor drive module 1 and the first control module 2 are electromagnetically connected through a relay coil and a relay contact corresponding to the relay coil; the motor drive module 1 and the second control module 3 are electromagnetically connected through a relay coil and a relay contact corresponding to the relay coil; and the first control module 2 and the second control module 3 are electromagnetically connected through a relay coil and a relay contact corresponding to the relay coil.

[0056] Motor drive module 1 includes inverter module 1100, first drive module 1200 and second drive module 1300. Inverter module 1100 is connected to first drive module 1200 and second drive module 1300 respectively. First drive module 1200 is used to drive first motor M1 or second motor M2. Second drive module 1300 is used to drive second motor M2.

[0057] The first control module 2 is used to control the inverter module 1100 in the motor drive module 1 to power on and operate, and to control the connection relationship between the inverter module 1100 and the first motor M1 and the second motor M2, so that the first drive module 1200 can drive the first motor M1 and the second drive module 1300 can drive the second motor M2.

[0058] The second control module 3 is used to control the connection relationship between the inverter module 1100 and the first motor M1 and the second motor M2, so that the first drive module 1200 can switch the drive object to the second motor M2.

[0059] Specifically, such as Figure 1 As shown, the motor drive module 1 has: a voltage input port 1001 and a common port 1002;

[0060] The motor drive module 1 includes: an inverter module 1100, a first drive module 1200, a second drive module 1300, a first relay contact K1, a second relay contact K2, a third relay contact K3, a fourth relay contact K4, a fifth relay first contact K51, a sixth relay first contact K61, and a seventh relay first contact K71;

[0061] The inverter module 1100 has: a first port 1101, a second port 1102, a third port 1103, a fourth port 1104, and a fifth port 1105.

[0062] The first drive module 1200 has: a first drive module first port 1201, a first drive module second port 1202 and a first drive module third port 1203;

[0063] The second drive module 1300 has: a first port 1301, a second port 1302, and a third port 1303;

[0064] The inverter module's first port 1101 is connected to the voltage input port 1001. The inverter module's second port 1102 is connected to the first drive module's first port 1201. The inverter module's third port 1103 is connected to the second drive module's first port 1301. The first drive module's second port 1202 is connected in series with the first relay contact K1 and then to the common port 1002. The first drive module's third port 1203 is connected in series with the second relay contact K2 and then to the common port 1002. The second drive module's second port 1302 is connected in series with the third relay contact K3 and then to the common port 1001. 2. The third port 1303 of the second drive module is connected in series with the fourth relay contact K4 and then connected to the common port 1002. One end of the first contact K51 of the fifth relay is connected in series with one end of the first contact K71 of the seventh relay and then connected to the fourth port 1104 of the inverter module. The other end of the first contact K71 of the seventh relay is used to connect to the first motor M1. The fifth port 1105 of the inverter module is connected to one end of the first contact K61 of the sixth relay. The other end of the first contact K61 of the sixth relay is connected to the other end of the first contact K51 of the fifth relay and then used to connect to the second motor M2.

[0065] Voltage input port 1001 is used to connect a power supply to power the inverter module 1100 in motor drive module 1.

[0066] The common port 1002 is typically grounded.

[0067] The first relay has: a first relay coil KC1 and a first relay contact K1. The first relay contact K1 is a normally open contact.

[0068] The second relay has: a second relay coil KC2 and a second relay contact K2. The second relay contact K2 is a normally open contact.

[0069] The third relay has: a third relay coil KC3 and a third relay contact K3. The third relay contact K3 is a normally open contact.

[0070] The fourth relay has: a fourth relay coil KC4 and a fourth relay contact K4. The fourth relay contact K4 is a normally open contact.

[0071] The fifth relay has: a fifth relay coil KC5, a fifth relay first contact K51, a fifth relay second contact K52, and a fifth relay third contact K53. Among them, the fifth relay first contact K51 is a normally open contact; the fifth relay second contact K52 and the fifth relay third contact K53 are normally closed contacts.

[0072] The sixth relay has: a sixth relay coil KC6, a sixth relay first contact K61, and a sixth relay second contact K62. The sixth relay first contact K61 is a normally open contact; the sixth relay second contact K62 is a normally closed contact.

[0073] The seventh relay has: a seventh relay coil KC7, a seventh relay first contact K71, a seventh relay second contact K72, and a seventh relay third contact K73. Among them, the seventh relay first contact K71 is a normally open contact; the seventh relay second contact K72 and the seventh relay third contact K73 are normally closed contacts.

[0074] The eighth relay has: an eighth relay coil KC8, an eighth relay first contact K81, an eighth relay second contact K82, an eighth relay third contact K83, and an eighth relay fourth contact K84. The eighth relay first contact K81, the eighth relay second contact K82, the eighth relay third contact K83, and the eighth relay fourth contact K84 are all normally open contacts.

[0075] The ninth relay has: a ninth relay coil KC9, a ninth relay first contact K91, a ninth relay second contact K92, and a ninth relay third contact K93. Among them, the ninth relay first contact K91 is a normally open contact; the ninth relay second contact K92 and the ninth relay third contact K93 are normally closed contacts.

[0076] For relays with only normally open contacts, when operating current flows through the relay coil, the corresponding normally open contact closes. Operating current refers to the current flowing through the relay coil that causes the normally open contact to close and the normally closed contact to open. When the operating current in the relay coil disappears, the corresponding normally open contact opens again.

[0077] Schematic representation: when the working current flows through the first relay coil KC1, the first relay contact K1 closes; when the working current in the first relay coil KC1 disappears, the first relay contact K1 opens again.

[0078] For a relay with normally open contacts, when operating current flows through the relay coil, the corresponding normally open contact closes. When the operating current in the relay coil disappears, the corresponding normally open contact opens again.

[0079] For a relay with normally closed contacts, when operating current flows through the relay coil, the normally closed contact corresponding to that relay opens. When the operating current in the relay coil disappears, the corresponding normally closed contact closes again.

[0080] Schematic illustration: When the operating current flows through the coil KC6 of the sixth relay, the first contact K61 of the sixth relay closes, and at the same time, the second contact K62 of the sixth relay opens; when the operating current in the coil KC6 of the sixth relay disappears, the first contact K61 of the sixth relay opens again, and the second contact K62 of the sixth relay closes again.

[0081] Specifically, such as Figure 1 As shown, the inverter module 1100 includes: a first inverter 1110 and a second inverter 1120;

[0082] The first port 1101 of the inverter module is used to obtain the input voltage. Typically, this voltage is a DC voltage.

[0083] The second port 1102 of the inverter module is used to obtain the control signal for the first inverter 1110.

[0084] The third port 1103 of the inverter module is used to obtain control signals for the second inverter 1120.

[0085] The fourth port 1104 of the inverter module is used to output the output voltage of the first inverter 1110 to drive the first motor M1 to rotate.

[0086] The fifth port 1105 of the inverter module is used to output the output voltage of the second inverter 1120 to drive the second motor M2 to rotate.

[0087] In this embodiment, the second motor M2 is a variable amplitude motor, which is used to change the working amplitude and adjust the horizontal or vertical distance, thereby adjusting the working radius or working range; the first motor M1 is an auxiliary hook motor, which is used in conjunction with the main hook to realize the dual hook collaborative operation, such as simultaneously lifting both ends of long goods to maintain balance.

[0088] During normal operation, the first inverter and the second inverter simultaneously control the auxiliary hook motor and the luffing motor, respectively. When the second inverter, the driver of the luffing motor, needs maintenance or malfunctions, the first inverter, the driver of the auxiliary hook motor, switches the driving object to the luffing motor. At this time, the auxiliary hook motor stops working and has no impact on the lifting of goods.

[0089] The first port 1201 of the first drive module is used to transmit control signals to the first inverter 1110.

[0090] The first port 1301 of the second drive module is used to transmit control signals to the second inverter 1120.

[0091] The second port 1202, the third port 1203, the second port 1302, and the third port 1303 of the first drive module are controlled to be connected to the common port 1002. The on or off state of the connection line from the corresponding port to the common port is controlled by the corresponding relay contact.

[0092] The first inverter 1110 has: a first inverter input port 1111, a first inverter output port 1112, and a first inverter controlled port 1113;

[0093] The second inverter 1120 has: a second inverter input port 1121, a second inverter output port 1122, and a second inverter controlled port 1123;

[0094] The first inverter input port 1111 is connected to the second inverter input port 1121 and serves as the first port 1101 of the inverter module. The first inverter output port 1112 serves as the fourth port 1104 of the inverter module. The first inverter controlled port 1113 serves as the second port 1102 of the inverter module. The second inverter output port 1122 serves as the fifth port 1105 of the inverter module. The second inverter controlled port 1123 serves as the third port 1103 of the inverter module.

[0095] The first inverter input port 1111 and the second inverter input port 1121 are used to obtain the input voltage for the corresponding inverter.

[0096] The first inverter output port 1112 is used to output the output voltage of the first inverter 1110.

[0097] The first inverter controlled port 1113 is used to obtain the control signal for the first inverter 1110.

[0098] The second inverter output port 1122 is used to output the output voltage of the second inverter 1120.

[0099] The second inverter controlled port 1123 is used to obtain control signals for the second inverter 1120.

[0100] Preferably, the output power of the first inverter and the output power of the second inverter can be the same or different.

[0101] Specifically, such as Figure 1 As shown, the first drive module 1200 includes: a first inverter controller 1210 and a first encoder 1220;

[0102] The first inverter controller 1210 has: a first inverter controller first port 1211, a first inverter controller second port 1212, and a first inverter controller third port 1213;

[0103] The first encoder 1220 has: a first encoder first port 1221 and a first encoder second port 1222;

[0104] The first inverter controller's first port 1211 is connected to the first encoder's first port 1221. The first inverter controller's second port 1212 serves as the first drive module's second port 1202. The first inverter controller's third port 1213 serves as the first drive module's first port 1201. The first encoder's second port 1222 serves as the first drive module's third port 1203.

[0105] The first port 1211 of the first inverter controller is used to receive the motor operating parameters obtained by the encoder to generate PWM control signals for controlling the power devices in the first inverter.

[0106] The third port 1213 of the first inverter controller is used to transmit a control signal to the first inverter 1110. Preferably, the control signal is a PWM control signal that drives the power devices in the inverter.

[0107] The first encoder's first port 1221 is used to transmit the motor operating parameters it monitors to the first inverter controller, including at least the motor's rotational angular velocity.

[0108] Specifically, such as Figure 2 As shown, the second drive module 1300 includes: a second inverter controller 1310 and a second encoder 1320;

[0109] The second inverter controller 1310 has: a first port 1311 of the second inverter controller, a second port 1312 of the second inverter controller, and a third port 1313 of the second inverter controller;

[0110] The second encoder 1320 has: a second encoder first port 1321 and a second encoder second port 1322;

[0111] The first port 1311 of the second inverter controller is connected to the first port 1321 of the second encoder. The second port 1312 of the second inverter controller serves as the second port 1302 of the second drive module. The third port 1313 of the second inverter controller serves as the first port 1301 of the second drive module. The second port 1322 of the second encoder serves as the third port 1303 of the second drive module.

[0112] The first port 1311 of the second inverter controller is used to receive the motor operating parameters obtained by the encoder to generate PWM control signals for controlling the power devices in the second inverter 1120.

[0113] The third port 1313 of the second inverter controller is used to transmit control signals to the second inverter 1120. Preferably, the control signal is a PWM control signal that drives the power devices in the inverter.

[0114] The first port 1321 of the second encoder is used to transmit the motor operating parameters monitored by the second inverter controller 1310 to the second inverter controller 1310. The operating parameters include at least the motor rotational angular velocity.

[0115] Specifically, such as Figure 3 As shown, the first control module 2 has: a first power port 201 and a second power port 202;

[0116] The first control module 2 includes a first switch branch 210, a first control branch 220, and a second control branch 230 connected in parallel between the first power port 201 and the second power port 202.

[0117] The first power port 201 and the second power port 202 are used to obtain AC voltage to enable the first control module 2 to operate. Schematic, the first power port 201 and the second power port 202 are connected to a 220V AC voltage.

[0118] The first switch branch 210 includes: the first contact S21 of the second switch, the first contact K91 of the ninth relay, the second contact K62 of the sixth relay, the second contact K72 of the seventh relay, and the coil KC5 of the fifth relay;

[0119] The first contact S21 of the second switch, the first contact K91 of the ninth relay, the second contact K62 of the sixth relay, the second contact K72 of the seventh relay, and the coil KC5 of the fifth relay are connected in series to form the first switch branch 210.

[0120] The first control branch 220 includes: the second contact of the second switch S22, the second contact of the ninth relay K92, the second contact of the fifth relay K52, and the coil of the sixth relay KC6;

[0121] The second contact S22 of the second switch, the second contact K92 of the ninth relay, the second contact K52 of the fifth relay, and the coil KC6 of the sixth relay are connected in series to form the first control branch 220.

[0122] The second control branch 230 includes: the third contact of the second switch S23, the third contact of the ninth relay K93, the third contact of the fifth relay K53, and the coil of the seventh relay KC7;

[0123] The second switch third contact S23, the ninth relay third contact K93, the fifth relay third contact K53 and the seventh relay coil KC7 are connected in series, forming the second control branch 230.

[0124] The second switch is used to switch the on or off states of the first switch branch 210, the first control branch 220, and the second control branch 230. Preferably, the second switch is a rotary switch. That is, by rotating the angle of the second switch, the on or off states of the first switch branch 210, the first control branch 220, and the second control branch 230 are switched.

[0125] The second switch has: a first contact S21, a second contact S22, and a third contact S23. When the second switch is rotated to a first angle, the first contact S21 is turned on; when the second switch is rotated to a second or third angle, the second contact S22 or the third contact S23 is turned on.

[0126] In this embodiment, the knobs of the first switch and the second switch are located on the control cabinet or console where the motor drive circuit is located.

[0127] Specifically, such as ​ As shown, the second control module 3 has: a third power port 301 and a fourth power port 302;

[0128] The second control module 3 includes a second switch branch 310, a third control branch 320, a fourth control branch 330, a fifth control branch 340, a sixth control branch 350, and a seventh control branch 360 connected in parallel between the third power port 301 and the fourth power port 302.

[0129] The second switch branch 310 is obtained by connecting the first switch S1 and the ninth relay coil KC9 in series;

[0130] The third control branch 320 is obtained by connecting the eighth relay coil KC8 and the third contact K73 of the seventh relay in series;

[0131] The fourth control branch 330 is obtained by connecting the first contact K81 of the eighth relay and the coil KC1 of the first relay in series;

[0132] The fifth control branch 340 is obtained by connecting the second contact K82 of the eighth relay and the coil KC2 of the second relay in series;

[0133] The sixth control branch 350 is obtained by connecting the third contact K83 of the eighth relay and the coil KC3 of the third relay in series;

[0134] The seventh control branch 360 is obtained by connecting the fourth contact K84 of the eighth relay and the coil KC4 of the fourth relay in series.

[0135] The third power port 301 and the fourth power port 302 are used to obtain DC voltage to enable the second control module 3 to operate. Schematic, a 24V DC voltage is connected between the third power port 310 and the fourth power port 302.

[0136] The first switch S1 is used to control the on or off state of the second switch branch 310. It can be a mechanical switch or an electronic switch. Preferably, the first switch S1 is an electronic switch, and its on or off state is controlled by a signal input via a ribbon cable.

[0137] All of the above contacts are connected in series with their respective branches via two connection terminals.

[0138] In some embodiments, the first inverter 1110 and the second inverter 1120 operate normally, and the second switch rotates to a state where both the second contact S22 and the third contact S23 of the second switch are closed; therefore, the first control branch 220 and the second control branch 230 are connected; operating current flows through the sixth relay coil KC6 and the seventh relay coil KC7, causing the first contact K61 of the sixth relay and the first contact K71 of the seventh relay to close; at this time, the first contact K51 of the fifth relay is open, the first inverter 1110 drives the first motor M1, and the second inverter 1120 drives the second motor M2.

[0139] In some other embodiments, the output power of the first inverter 1110 is the same as the output power of the second inverter 1120. When the second inverter 1120 malfunctions, the first switch S1 is turned on, and the second switch is rotated to the state where the first contact S21 of the second switch is on. Operating current flows through the coil KC9 of the ninth relay, causing the first contact K91 of the ninth relay to close and the second contact K92 and the third contact K93 of the ninth relay to open. At this time, the first switch branch 210 is on, and operating current flows through the coil KC5 of the fifth relay, causing the first contact K51 of the fifth relay to close and the second contact K52 and the third contact K53 of the fifth relay to open. The third control branch 320, connected in parallel between the first power port 201 and the second power port 202, is on, and operating current flows through the coil KC8 of the eighth relay, causing the first contact K81, the second contact K82, the third contact K83, and the fourth contact K84 of the eighth relay to close, thereby causing the fourth control branch 330, the fifth control branch 340, the sixth control branch 350, and the seventh control branch 360 to close. 0 is conducting; therefore, operating current flows through the first relay coil KC1, the second relay coil KC2, the third relay coil KC3, and the fourth relay coil KC4 respectively, thereby closing the first relay contact K1, the second relay contact K2, the third relay contact K3, and the fourth relay contact K4; due to the rotation of the second switch, the second contact S22 and the third contact S23 of the second switch are opened, causing the first control branch 220 and the second control branch 230 to open, the operating current in the sixth relay coil KC6 and the seventh relay coil KC7 disappears, and the first contact K61 of the sixth relay and the first contact K71 of the seventh relay are opened again; under this condition, the output voltage of the first inverter 1110 provides driving voltage to the second motor M2 through the closed first contact K51 of the fifth relay; since the output power of the first inverter is the same as the output power of the second inverter, when the second inverter fails, the first inverter can continuously supply power to the second motor M2 through the above process.

[0140] In some embodiments, the output power of the first inverter is different from that of the second inverter. When it is necessary to switch the input power of the second motor M2, the first switch S1 is turned on, and the second switch is rotated to the state where the first contact S21 of the second switch is on. This allows the first inverter to replace the second inverter in supplying power to the second motor M2. The switching principle has been described above and will not be repeated here.

[0141] By implementing the motor drive circuit described in the embodiments of this application, and switching the relay contacts, the second motor requiring protection can be driven by the first inverter when the second inverter needs maintenance or malfunctions, thus maintaining the continuous operation of the second motor. When the input power required by the second motor changes, the drive power driving the second motor can be quickly adjusted by switching the second switch to adapt to the needs of the second motor.

[0142] All of the above-mentioned optional technical solutions can be combined in any way to form the optional embodiments of this application, and will not be described in detail here.

[0143] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments. Many other equivalent embodiments may be included without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A motor drive circuit, characterized in that, include: The system includes a motor drive module, a first control module, and a second control module; the motor drive module is electromagnetically connected to the first control module and the second control module, and the first control module and the second control module are electromagnetically connected. The motor drive module includes an inverter module, a first drive module, and a second drive module. The inverter module is connected to the first drive module and the second drive module respectively. The first drive module is used to drive a first motor or a second motor, and the second drive module is used for the second motor. The first control module is used to control the connection relationship between the inverter module and the first motor and the second motor, so that the first drive module drives the first motor and the second drive module drives the second motor; The second control module is used to control the connection relationship between the inverter module and the first motor and the second motor, so that the first drive module can switch the drive object to the second motor.

2. The motor drive circuit according to claim 1, characterized in that, The motor drive module includes several relay contacts; The first control module includes a first power port, a second power port, and a first switch branch, a first control branch, and a second control branch connected in parallel between the first power port and the second power port. The first control module includes a second switch contact, a plurality of relay contacts, and a coil. The second control module includes a third power port and a fourth power port, and a second switch branch, a third control branch, a fourth control branch, a fifth control branch, a sixth control branch and a seventh control branch connected in parallel between the third power port and the fourth power port. The second control module includes a first switch, a plurality of relay contacts and a coil. The closed state of the second switch contact in the first control module responds to the first external command, and the closed state of the relay contact in the motor drive module responds to the closed state of the second switch contact, so as to control the inverter module to be connected to the first motor and the second motor respectively, so that the first drive module can drive the first motor and the second drive module can drive the second motor; The closed state of the second switch contact in the first control module and the closed state of the first switch in the second control module respond to the second external command. The closed state of the relay contact in the motor drive module responds to the closed state of the second switch contact and the closed state of the first switch, so as to control the inverter module to connect with the second motor. The inverter module is disconnected from the first motor so that the first drive module can switch the drive object to the second motor.

3. The motor drive circuit according to claim 1 or 2, characterized in that, The motor drive module further includes a voltage input port and a common port; the inverter module is connected to the voltage input port, and the inverter module is connected to the first drive module and the second drive module respectively. The first drive module is connected to the common port, and the second drive module is connected to the common port.

4. The motor drive circuit according to claim 3, characterized in that, The motor drive module further includes: a first relay contact, a second relay contact, a third relay contact, a fourth relay contact, a first contact of a fifth relay, a first contact of a sixth relay, and a first contact of a seventh relay; The inverter module has: an inverter module first port, an inverter module second port, an inverter module third port, an inverter module fourth port, and an inverter module fifth port; The first driving module has: a first driving module first port, a first driving module second port, and a first driving module third port; The second drive module has: a first port of the second drive module, a second port of the second drive module, and a third port of the second drive module; The first port of the inverter module is connected to the voltage input port. The second port of the inverter module is connected to the first port of the first drive module. The third port of the inverter module is connected to the first port of the second drive module. The second port of the first drive module is connected to the common port after being connected in series with the first relay contact. The third port of the first drive module is connected to the common port after being connected in series with the second relay contact. The second port of the second drive module is connected to the common port after being connected in series with the third relay contact. The third port of the second drive module is connected to the common port after being connected in series with the fourth relay contact. One end of the first contact of the fifth relay is connected in series with one end of the first contact of the seventh relay and then connected to the fourth port of the inverter module. The other end of the first contact of the seventh relay is used to connect to the first motor. The fifth port of the inverter module is connected to one end of the first contact of the sixth relay. The other end of the first contact of the sixth relay is connected to the other end of the first contact of the fifth relay and then used to connect to the second motor.

5. The motor drive circuit according to claim 4, characterized in that, The inverter module includes: a first inverter and a second inverter; The first inverter has: a first inverter input port, a first inverter output port, and a first inverter controlled port; The second inverter has: a second inverter input port, a second inverter output port, and a second inverter controlled port; The first inverter input port is connected to the second inverter input port and serves as the first port of the inverter module. The first inverter output port serves as the fourth port of the inverter module. The first inverter controlled port serves as the second port of the inverter module. The second inverter output port serves as the fifth port of the inverter module. The second inverter controlled port serves as the third port of the inverter module.

6. The motor drive circuit according to claim 4, characterized in that, The first drive module includes: a first controller and a first encoder; The first controller has: a first controller first port, a first controller second port, and a first controller third port; The first encoder has: a first encoder first port and a first encoder second port; The first port of the first controller is connected to the first port of the first encoder, the second port of the first controller serves as the second port of the first drive module, the third port of the first controller serves as the first port of the first drive module, and the second port of the first encoder serves as the third port of the first drive module.

7. The motor drive circuit according to claim 4, characterized in that, The second drive module includes: a second controller and a second encoder; The second controller has: a first port of the second controller, a second port of the second controller, and a third port of the second controller; The second encoder has: a first port of the second encoder and a second port of the second encoder; The first port of the second controller is connected to the first port of the second encoder, the second port of the second controller serves as the second port of the second drive module, the third port of the second controller serves as the first port of the second drive module, and the second port of the second encoder serves as the third port of the second drive module.

8. The motor drive circuit according to claim 2, characterized in that, The first switch branch includes: the first contact of the second switch, the first contact of the ninth relay, the second contact of the sixth relay, the second contact of the seventh relay, and the coil of the fifth relay; The first contact of the second switch, the first contact of the ninth relay, the second contact of the sixth relay, the second contact of the seventh relay, and the coil of the fifth relay are connected in series to form the first switch branch.

9. The motor drive circuit according to claim 2, characterized in that, The first control branch includes: the second contact of the second switch, the second contact of the ninth relay, the second contact of the fifth relay, and the coil of the sixth relay; The second contact of the second switch, the second contact of the ninth relay, the second contact of the fifth relay, and the coil of the sixth relay are connected in series to form the first control branch.

10. The motor drive circuit according to claim 2, characterized in that, The second control branch includes: the third contact of the second switch, the third contact of the ninth relay, the third contact of the fifth relay, and the coil of the seventh relay; The third contact of the second switch, the third contact of the ninth relay, the third contact of the fifth relay, and the coil of the seventh relay are connected in series to form the second control branch.

11. The motor drive circuit according to claim 2, characterized in that, The second switch branch is obtained by connecting the first switch and the coil of the ninth relay in series; The third control branch is obtained by connecting the coil of the eighth relay and the third contact of the seventh relay in series; The fourth control branch is obtained by connecting the first contact of the eighth relay and the coil of the first relay in series. The fifth control branch is obtained by connecting the second contact of the eighth relay and the coil of the second relay in series. The sixth control branch is obtained by connecting the third contact of the eighth relay and the coil of the third relay in series. The seventh control branch is obtained by connecting the fourth contact of the eighth relay and the coil of the fourth relay in series.

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