CN116760332A - Motor controller for shielding pump - Google Patents
Motor controller for shielding pump Download PDFInfo
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- CN116760332A CN116760332A CN202310676350.9A CN202310676350A CN116760332A CN 116760332 A CN116760332 A CN 116760332A CN 202310676350 A CN202310676350 A CN 202310676350A CN 116760332 A CN116760332 A CN 116760332A
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- 238000004891 communication Methods 0.000 claims abstract description 57
- 238000001514 detection method Methods 0.000 claims abstract description 9
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- 238000002955 isolation Methods 0.000 claims description 25
- 238000006243 chemical reaction Methods 0.000 claims description 13
- 230000033228 biological regulation Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 239000013078 crystal Substances 0.000 claims description 4
- 238000005070 sampling Methods 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 230000001105 regulatory effect Effects 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 12
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- 102100029500 Prostasin Human genes 0.000 description 2
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- 238000013461 design Methods 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
- H02K11/30—Structural association with control circuits or drive circuits
- H02K11/33—Drive circuits, e.g. power electronics
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
The invention discloses a motor controller for a canned motor pump, which is communicated with an upper computer through an RS485 serial port, wherein the motor controller comprises a main control module and a power module, and the power module comprises a power supply circuit, a communication circuit and an IPM circuit; the main control module comprises a motor control chip and a storage circuit connected with the motor control chip; the IPM circuit is used for receiving PWM driving signals output by the motor control chip, the communication circuit is used for receiving speed regulating signals of the upper computer, the motor control chip is used for collecting motor current and bus voltage, and sending the collected motor current, bus voltage and fault detection signals to the upper computer for real-time display, and the storage circuit is used for storing communication data between the motor controller and the upper computer. The scheme can realize real-time monitoring and display of the running state of the motor of the canned motor pump, and timely respond to the fault state, thereby being beneficial to reducing the maintenance cost of the motor.
Description
Technical Field
The invention relates to the technical field of canned motor pumps, in particular to a motor controller for a canned motor pump.
Background
The canned motor pump connects the impeller shaft of the pump with the electric shaft through a coupling, so that the impeller rotates together with the motor, and the rotor and the stator of the motor are separated by a canned sleeve, the pump and the driving motor are sealed in a pressure container filled with pumping medium, and the power of the pump and the driving motor is transmitted to the rotor through a stator magnetic field.
For the control of a canned motor pump, the working condition of the motor inside the canned motor pump cannot be known usually due to the canned motor, and the canned motor pump is low in efficiency and difficult to maintain due to phase failure, overload heating or long-time operation under the condition of small flow.
Disclosure of Invention
In view of the above problems, the invention provides a motor controller for a canned motor pump, which can timely respond to the motor fault state by collecting the motor current and the bus voltage in real time and displaying the motor running state, can remotely start and stop and regulate the speed of the motor through RS485 communication, can save the motor working parameters through a storage circuit when the motor is in a fault stop state so as to check the motor fault, and can reduce the running cost and the maintenance cost of the canned motor pump.
The invention provides a motor controller for a canned motor pump, which comprises a main control module and a power module, wherein the power module comprises a power supply circuit, a communication circuit and an IPM circuit; the main control module comprises a motor control chip and a storage circuit connected with the motor control chip; the IPM circuit is used for receiving PWM driving signals output by the motor control chip, the communication circuit is used for receiving speed regulating signals of the upper computer, the motor control chip is used for collecting motor current and bus voltage, and sending the collected motor current, bus voltage and fault detection signals to the upper computer for real-time display, and the storage circuit is used for storing communication data between the motor controller and the upper computer.
Optionally, in the above motor controller, the power supply circuit includes a power supply access circuit and a voltage conversion circuit, the power supply access circuit includes a protection circuit, a rectifying circuit and a slow start circuit,
the protection circuit comprises a piezoresistor, a first safety capacitor and a second safety capacitor, wherein the piezoresistor is connected between the live wire and the zero wire in parallel, the first safety capacitor is connected between the zero wire and the ground wire in parallel, and the second safety capacitor is connected between the live wire and the ground wire in parallel;
the rectification circuit is a bridge rectification circuit consisting of a first diode, a second diode, a third diode and a fourth diode, a live wire is connected between the first diode and the third diode, and a zero wire is connected between the second diode and the fourth diode and is used for converting 220V alternating current into 310V direct current input voltage;
the slow start circuit is connected between the rectifying circuit and the bus circuit, and comprises a first thermosensitive circuit, a second thermosensitive resistor and a relay, the switch of the relay is controlled by the IPM circuit, and the bus circuit comprises a first bus capacitor, a second bus capacitor, a resistor and a power indicator lamp which are connected in parallel with the second bus capacitor.
Optionally, in the above motor controller, the voltage conversion circuit uses TMG0565 as a switching power supply control chip for converting the 310V dc input voltage into a 15V power supply voltage and a 15V isolation voltage, the 15V power supply voltage being used for supplying power to the IPM circuit, and the 15V isolation voltage being used for supplying power to a heat dissipation fan of the motor controller.
Optionally, in the above motor controller, the voltage conversion circuit converts the 15V power voltage into the 5V voltage through the first LDO voltage regulator, converts the 5V voltage into the 3.3V voltage through the second LDO voltage regulator to supply power to the main control module, and converts the 15V isolation voltage into the 5V isolation voltage through the third LDO voltage regulator to supply power to the communication circuit.
Optionally, in the above motor controller, the power module further includes a fan driving circuit, where the fan driving circuit includes an optocoupler, a first voltage dividing resistor and a second voltage dividing resistor, and the first voltage dividing resistor and the second voltage dividing resistor are used to divide the 15V isolation voltage, so that the cooling fan works at the rated working voltage.
Optionally, in the above motor controller, the IPM circuit includes a PS21a29 smart power chip, and an overcurrent protection circuit and a bootstrap circuit connected to the smart power chip,
the overcurrent protection circuit is used for converting the collected motor current into motor voltage through the sampling resistor, comparing the motor voltage with the threshold voltage through the voltage comparator, outputting an overcurrent signal to the IPM circuit by the voltage comparator when the motor voltage exceeds the threshold voltage, stopping the work of the IPM circuit, outputting a fault signal to the main control module, and stopping the output of the PWM driving signal by the main control module; the bootstrap circuit comprises a current limiting resistor, a bootstrap diode, a bootstrap capacitor and a voltage stabilizing diode, wherein one end of the current limiting resistor is connected with 15V power supply voltage, the other end of the current limiting resistor is connected with the anode of the bootstrap diode, and the other end of the bootstrap diode is connected with the high end of the IPM bootstrap circuit; one end of the bootstrap capacitor is connected with the cathode of the bootstrap diode, and the other end of the bootstrap capacitor is connected with the low end of the IPM bootstrap circuit; the voltage stabilizing diode is connected in parallel at two ends of the bootstrap capacitor.
Optionally, in the above motor controller, the communication circuit includes an isolation chip, a communication chip and a TVS diode, the isolation chip is connected with the communication chip, the isolation chip uses pi 121U31, the communication chip uses MAX13487, and the TVS diode is disposed between the communication chip and the external interface.
Optionally, in the above motor controller, the motor control chip uses IRMCF171 as a main control chip, and peripheral circuits of the motor control chip include a 4MHz crystal oscillator circuit, a current collecting circuit, a voltage collecting circuit, and a storage circuit, where the current collecting circuit is used to collect motor current and output the motor current to an internal register, and the voltage collecting circuit is used to collect fault voltage and bus voltage;
the storage circuit adopts an AT24C16 storage chip and is used for storing communication data between the motor controller and the upper computer and setting data for the communication circuit, wherein the setting data comprises an equipment ID number, a communication rate and motor steering.
Optionally, in the above motor controller, motor control software is installed in the upper computer, and is used for sending a motor speed regulation signal to the communication circuit, and controlling the motor to start and stop according to the motor current, the bus voltage and the fault detection signal.
Optionally, in the above motor controller, the motor controller further includes a fault indicator, and different flashing frequencies of the fault indicator indicate different fault states.
According to the scheme of the invention, through collecting the motor current and the bus voltage in real time and displaying the motor running state, the corresponding reaction can be carried out on the motor fault state in time, the remote start-stop and speed regulation control can be carried out on the motor through RS485 communication, and the motor working parameters can be saved through the storage circuit when the motor is in fault stop so as to facilitate the investigation of the motor fault, and the running cost and the maintenance cost of the canned motor pump motor can be reduced.
The foregoing description is only an overview of the present invention, and is intended to be implemented in accordance with the teachings of the present invention in order that the same may be more clearly understood and to make the same and other objects, features and advantages of the present invention more readily apparent.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to designate like parts throughout the figures. In the drawings:
FIG. 1 shows a schematic diagram of a motor controller for a canned motor pump according to one embodiment of the present invention;
FIG. 2 illustrates a host computer control interface schematic according to one embodiment of the invention;
FIG. 3 shows a schematic diagram of a power access circuit according to one embodiment of the invention;
fig. 4 shows a schematic diagram of a voltage conversion circuit according to an embodiment of the invention;
FIG. 5 shows a schematic diagram of an IPM circuit according to one embodiment of the invention;
fig. 6 shows a schematic diagram of a communication circuit according to an embodiment of the invention;
FIG. 7 shows a schematic diagram of a fan drive circuit according to one embodiment of the present invention;
fig. 8 is a circuit schematic diagram of a main control module according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The shielding pump is widely applied in the fields of petrochemical industry, nuclear power, refrigeration and the like, and mainly comprises a centrifugal pump and a shielding motor. Because the internal working state of the canned motor pump can not be determined through the canned motor pump, and a single canned motor pump is generally adopted for independent control, all protection signals can not be controlled in a centralized manner, and the large-flow complex working condition can not be met.
In order to perform visual monitoring and control on the motor of the canned motor pump, the scheme provides a motor controller for the canned motor pump, and the motor controller can check the running state of the motor in real time by comprehensively processing various protection signals such as overcurrent, overtemperature, overvoltage, undervoltage, communication faults and the like of the motor of the canned motor pump, and can avoid the loss of the working parameters of the motor through a storage circuit when the motor is powered off; the remote centralized control of the motor is realized through the communication interface, the protection value of each protection signal of the motor can be set through the upper computer, the circuit fault is checked through the debugging interface, and the performance of the motor control chip of the canned motor pump can be obviously improved.
Fig. 1 shows a schematic diagram of a motor controller for a canned motor pump according to an embodiment of the present invention. As shown in fig. 1, the motor controller comprises a main control module and a power module, wherein the power module mainly comprises a power supply circuit, a communication circuit and an IPM circuit; the main control module comprises a motor control chip and a storage circuit; the IPM circuit is used for PWM driving signals of the main control module, the communication circuit is used for receiving speed regulation signals of the upper computer, the motor control chip is used for sending collected motor current, bus voltage and fault detection signals to the upper computer for real-time display, and the storage circuit is used for storing communication data between the motor controller and the upper computer.
The motor controller is in communication connection with the upper computer through an RS485 interface, and motor control software is installed in the upper computer and used for controlling the starting, stopping and speed regulation of the motor according to motor operation signals, wherein the motor operation signals comprise bus voltage, motor current, motor fault states and the like.
After the upper computer control software is operated, firstly, a serial port is opened, the serial port number of the access equipment is selected by the current serial port number, and then, a controller power supply is started to perform control operation. The device address can be read at the control interface of the motor controller, and the device baud rate can be set. And bus voltage, motor current, motor rotating speed, fault codes and the like can be read, and the motor is controlled to stop working according to different fault states of the motor, so that start and stop control of the motor is realized. Different fault conditions of the motor may be determined by different flashing frequencies of the fault indicator. Table 1 shows a table of the correspondence of fault conditions to indicator light flashing frequencies according to one embodiment of the invention.
| Fault name | Flicker frequency |
| Overcurrent flow | Bright-bright |
| Overpressure | Bright-bright |
| Under-voltage | Bright-bright |
| Over-temperature | Bright-bright |
| Zero speed | Bright-bright |
| Communication failure | Bright-bright |
FIG. 2 illustrates a host computer control interface schematic according to one embodiment of the invention. As shown in FIG. 2, the upper computer software control interface can display information such as equipment address, equipment baud rate, motor current, bus voltage, motor rotating speed, fault code and the like in real time, control low-speed starting of a motor, set the motor rotating speed and abnormally stop the motor, click forward and reverse buttons to modify the motor direction in a motor stop state, and save motor setting parameters and motor operating parameters in a power-down state.
According to one embodiment of the present invention, the power module may include a power supply circuit, a communication circuit, a fan driving circuit, an IPM circuit, and a bootstrap circuit, an overcurrent protection circuit connected to the IPM circuit.
The motor controller is powered by a 220V alternating current power supply, and the power supply circuit can comprise a power supply access circuit and a voltage conversion circuit, wherein the power supply access circuit comprises a protection circuit, a rectifying circuit and a slow starting circuit.
Fig. 3 shows a schematic diagram of a power access circuit according to an embodiment of the invention. As shown in fig. 3, the protection circuit includes a varistor VAR1, a first safety capacitor CY1 and a second safety capacitor CY2. The varistor VAR1 is connected in parallel between the live wire L and the zero line N, the first safety capacitor CY1 is connected in parallel between the zero line N and the ground line PE, and the second safety capacitor CY2 is connected in parallel between the live wire L and the ground line PE.
The rectifying circuit is a bridge rectifying circuit consisting of a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4, wherein a live wire L is connected between the D1 and the D3, and a zero wire N is connected between the D2 and the D4 and is used for converting 220V alternating current into 310V direct current input voltage.
The slow start circuit comprises a first thermosensitive circuit RT1, a second thermosensitive resistor RT2 and a relay RLY1 which are connected between the rectifying circuit and the bus circuit, the switch of the relay is controlled by a driving voltage signal (P3.0-REALY) in the IPM circuit, and the bus circuit comprises a first bus capacitor CAP1, a second bus capacitor CAP2 which are connected in parallel, resistors (R10, R11 and R12) which are connected in parallel with the second bus capacitor CAP2 and a power indicator LED1. The bus voltage signal DCP_AD is collected through resistors R7 and R8 and then is collected through a voltage collection pin of a voltage control chip in the interface main control module.
When the power is on, the current is firstly used for slowly charging the bus capacitor through RT1 and RT2, when the voltage of the bus capacitors CAP1 and CAP2 is charged to a starting voltage value (meeting the working condition of a switch power supply), the switch power supply supplies power to the main control module, meanwhile, the main control module collects the bus voltage, when the bus voltage reaches a preset voltage value, the main control module outputs relay control signals (P3.0-REARLY) to the IPM circuit, and a driving voltage signal in the IPM circuit controls the relay RLY1 to be conducted, so that the first thermistor RT1 and the second thermistor RT2 are short-circuited, and the normal operation of the system is not influenced. The slow start circuit can prevent the bridge rectifier from being damaged by overlarge charging current of the bus capacitor.
Since five power supplies of 15V, 15V_ISO, +10V_ISO, 5V_ISO, +3.3V are required inside the controller. Therefore, the voltage conversion circuit is required to perform voltage conversion on the 310V direct current input voltage output by the power supply access circuit.
Fig. 4 shows a schematic diagram of a voltage conversion circuit according to an embodiment of the invention. As shown in fig. 4, the internal power supply voltages mainly have five paths of 15V, 15v_iso, 5v_iso, +3.3v. The switching power supply U1 adopts TMG0565 as a switching power supply control chip, and inputs 310V direct current input voltage, and the 310V direct current input voltage is converted into two paths of voltages, namely 15V power supply voltage and 15V isolation voltage 15V ISO through a transformer U3. The 15V power supply voltage is used for supplying power to the IPM circuit and controlling the relay of the slow start circuit to conduct.
The 15V power supply voltage also needs to be converted into 3.3V voltage to supply power for the main control module. Because the voltage drop of the 15V is directly converted into 3.3V and the generated heat loss is also large, a secondary conversion circuit is adopted to convert the 15V into 5V and then convert the 5V into 3.3V. The 15V isolation voltage 15v_iso is used to power the cooling fan of the motor controller. Meanwhile, 15v_iso also needs to be converted into 5v_iso for power supply of the communication circuit.
The first LDO voltage regulator U7 can convert 15V power supply voltage into 5V voltage by adopting L78M05, the second LDO voltage regulator U9 can convert 5V voltage into +3.3V voltage by adopting an AMS1117-3.3 three-terminal integrated voltage regulator, and the third LDO voltage regulator U8 can convert 15V isolation voltage (15 V_ISO) into 5V isolation voltage (+5V_ISO) by adopting a 78L05 three-terminal integrated voltage regulator.
The IPM circuit is an intelligent power module, a PS21A29 intelligent power chip can be adopted, six paths of IGBT power switching tubes and a driving circuit are integrated in the IPM circuit, PWM signals can be directly output to control the on-off of the IGBTs, and meanwhile, the IPM circuit has the functions of temperature detection, overcurrent protection, fault output and the like.
Fig. 5 shows a schematic structure of an IPM circuit according to an embodiment of the present invention. As shown in fig. 5, the pins of the PS21a29 smart power chip are:
p is a direct current input end; u, V, W are three-phase output ends of the inverter; UP, VP, WP is the upper bridge arm; pulse signal input ends of each phase of U, V and W; UN, VN, WN is the lower leg; VP1 and VPC are the working power supply input ends of the upper bridge arm, VP1 is the positive end, and VPC is the negative end; VN1 and VNC are the working power supply input ends of the lower bridge arm, VN1 is the positive end, and VNC is the negative end; CIN is the input end of the current detection signal; FO is the fault output (active low); CFO is a fault output pulse width control end; V-UFB and V-UFS are two ends of the U-phase bootstrap circuit, V-UFB is the high end, and V-UFS is the low end; V-VFB and V-VFS are two ends of the V-phase bootstrap circuit, V-VFB is a high end, and V-VFS is a low end; V-WFB and V-WFS are the two ends of the W-phase bootstrap circuit, V-WFB is the high end, and V-WFS is the low end.
The Vot pin can output 2.5-4.7V, and the corresponding temperature TEMP signal is 40-130 degrees; and Vsc is a current acquisition pin, the external sampling resistor can realize overcurrent protection, and the Fo pin outputs low level after the overcurrent protection is triggered.
Since the bootstrap circuit is not integrated inside the PS21a29 chip, the PS21a29 chip requires an external bootstrap circuit. As shown in fig. 5, the bootstrap circuit includes current limiting resistors (R28, R29, R27), bootstrap diodes (D11, D12, D10), bootstrap capacitors (C15, C17, C20) and voltage stabilizing diodes (D7, D8, D9), taking a U-phase motor driving circuit as an example, one end of the current limiting resistor R28 is connected to a 15V power supply voltage, the other end is connected to an anode of the bootstrap diode D11, and the other end of the bootstrap diode D11 is connected to a high end (V-UFB) of the IPM bootstrap circuit; one end of the bootstrap capacitor C15 is connected with the cathode of the bootstrap diode D11, and the other end of the bootstrap capacitor C is connected with the low end (V-UFS) of the IPM bootstrap circuit; the zener diode D7 is connected in parallel to both ends of the bootstrap capacitor C15.
The bootstrap diode can prevent current from flowing backward, and the voltage stabilizing diode can prevent the internal IGBT pins from being damaged by abnormal voltage.
The IPM circuit is further required to be externally connected with an overcurrent protection circuit, the overcurrent protection circuit is used for collecting three-phase motor current, the motor current is converted into motor voltage through sampling resistors (R33, R34 and R35), the motor voltage is compared with threshold voltage through a voltage comparator LM393DR2G, when the motor voltage exceeds the threshold voltage, the voltage comparator LM393DR2G outputs an overcurrent signal to an ITRIP pin of the IPM circuit, the ITRIP and the IPM are connected with each other through an or gate chip SN74AHC1G08DBVR with the overcurrent protection, and when any trigger is triggered, an FLT/EN signal can be output to the main control module, so that the main control module stops outputting PWM signals.
The communication circuit is an RS485 communication circuit, and in order to prevent external signal interference, an isolation design can be adopted for the communication circuit. Fig. 6 shows a schematic diagram of a communication circuit according to an embodiment of the invention. As shown in fig. 6, the communication circuit includes an isolation chip U11, a communication chip U15, and a TVS diode for isolating a transmit signal TXD and a receive signal RXD. The isolation chip U11 adopts pi 121U31, the communication chip adopts MAX13487, the isolation chip U11 is connected with the communication chip U15, namely the VIB pin of U11 is connected with the RO pin of U15, and the VOA pin of U11 is connected with the DI pin of U15. The communication circuit is powered with a 5v_iso isolated voltage. A TVS (transient diode) is provided between the communication chip and the external interface JP3, so that external transient interference can be suppressed.
The bottom of the motor controller is also provided with a cooling fan, and the cooling fan is powered by a 15V isolation power supply, so that an optocoupler is required to isolate control signals. The rated power supply voltage of the fan is 12V, and in order to prevent the fan from being damaged due to overhigh 15V isolation power supply voltage, a first voltage dividing resistor and a second voltage dividing resistor can be connected in series in the fan driving circuit and used for dividing the 15V isolation voltage to supply power for the cooling fan. The two voltage dividing resistors need to divide 3V, and the voltage dividing resistance value is calculated to be 75 ohms.
Fig. 7 shows a schematic diagram of a fan driving circuit according to an embodiment of the present invention. As shown in fig. 7, the fan driving circuit includes an optocoupler EL8175, a first voltage dividing resistor R98, and a second voltage dividing resistor R99, each having a resistance value of 75 ohms, and can realize a voltage division of 3V.
Fig. 8 is a circuit schematic diagram of a main control module according to an embodiment of the present invention. As shown in fig. 8, the main control module adopts IRMCF171 as a main control chip, and the chip has an independent motion control engine to implement a motor control algorithm, and an 8051 kernel is embedded, so that the motor can be controlled only by inputting simple parameters. The peripheral circuit comprises a 4MHz crystal oscillator circuit (a crystal oscillator X1 connected to the pins XTAL0 and XTAL 1), a current acquisition circuit (for acquiring motor current I_ U, I _V), a voltage acquisition circuit (for acquiring DCP_AD voltage signals) and the like. Two operational amplifier circuits are integrated in the circuit to output 6 PWM signals (PWMWL, PWMWH, PWMVL, PWMVH, PWMUL, PWMUH) for driving the IPM circuit.
The IRMCF171 collects the motor current (i_ U, I _v) through a current collection circuit, and the collection result is directly output to an internal register. Overvoltage and undervoltage protection is carried out on the motor by collecting busbar voltage DCP_AD, and the temperature signal of TEMP is collected to realize over-temperature protection; FLT/EN is that the overcurrent protection signal is connected with the GATEKILL fault detection pin, and the low level trigger can be output by the IPM itself or by the hardware overcurrent protection.
Because the IRMCF171 chip has larger voltage reference error, the AIN3 and AIN4 pins are two-level reference voltage, and the acquisition accuracy is ensured. Under the drive control of the main control module, the motor power can output 3kW.
The storage circuit is connected with the motor control chip through SDL and SCL pins, and an AT24C16 storage chip is adopted for storing communication data between the motor controller and the upper computer, wherein the communication data comprise setting data of the communication circuit, and the setting data comprise equipment ID numbers, communication rates, motor steering and the like.
In addition, the motor controller also comprises fault indication lamps connected with the main control module, and different fault indication lamps have different flashing frequencies and respectively represent different fault states.
According to the motor controller for the canned motor pump, provided by the invention, the running state of the motor can be acquired in real time and accurately controlled through the communication module, the running state of the motor can be displayed in the upper computer, the motor can be started and stopped and the speed regulation is controlled, and the running cost and the maintenance cost of the canned motor can be reduced.
In the description provided herein, numerous specific details are set forth. However, it is understood that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be construed as reflecting the intention that: i.e., the claimed invention requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules or units or components of the devices in the examples disclosed herein may be arranged in a device as described in this embodiment, or alternatively may be located in one or more devices different from the devices in this example. The modules in the foregoing examples may be combined into one module or may be further divided into a plurality of sub-modules.
Those skilled in the art will appreciate that the modules in the apparatus of the embodiments may be adaptively changed and disposed in one or more apparatuses different from the embodiments. The modules or units or components of the embodiments may be combined into one module or unit or component and, furthermore, they may be divided into a plurality of sub-modules or sub-units or sub-components. Any combination of all features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or units of any method or apparatus so disclosed, may be used in combination, except insofar as at least some of such features and/or processes or units are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings), may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features but not others included in other embodiments, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. Furthermore, some of the embodiments are described herein as methods or combinations of method elements that may be implemented by a processor of a computer system or by other means of performing the functions. Thus, a processor with the necessary instructions for implementing the described method or method element forms a means for implementing the method or method element. Furthermore, the elements of the apparatus embodiments described herein are examples of the following apparatus: the apparatus is for carrying out the functions performed by the elements for carrying out the objects of the invention.
As used herein, unless otherwise specified the use of the ordinal terms "first," "second," "third," etc., to describe a general object merely denote different instances of like objects, and are not intended to imply that the objects so described must have a given order, either temporally, spatially, in ranking, or in any other manner.
While the invention has been described with respect to a limited number of embodiments, those skilled in the art, having benefit of the above description, will appreciate that other embodiments are contemplated within the scope of the invention as described herein. Furthermore, it should be noted that the language used in the specification has been principally selected for readability and instructional purposes, and may not have been selected to delineate or circumscribe the inventive subject matter. Accordingly, many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the appended claims. The disclosure of the present invention is intended to be illustrative, but not limiting, of the scope of the invention, which is defined by the appended claims.
Claims (10)
1. The motor controller for the canned motor pump is in communication connection with an upper computer through an RS485 serial port, and is characterized by comprising a main control module and a power module, wherein the power module comprises a power supply circuit, a communication circuit and an IPM circuit; the main control module comprises a motor control chip and a storage circuit connected with the motor control chip;
the IPM circuit is used for receiving PWM driving signals output by the motor control chip;
the communication circuit is used for receiving a speed regulation signal of the upper computer;
the motor control chip is used for collecting motor current and bus voltage and sending the collected motor current, bus voltage and fault detection signals to the upper computer for real-time display;
the storage circuit is used for storing communication data between the motor controller and the upper computer.
2. The motor controller of claim 1 wherein the power supply circuit comprises a power supply access circuit and a voltage conversion circuit, the power supply access circuit comprising a protection circuit, a rectifier circuit and a slow start circuit,
the protection circuit comprises a piezoresistor, a first safety capacitor and a second safety capacitor, wherein the piezoresistor is connected between the live wire and the zero wire in parallel, the first safety capacitor is connected between the zero wire and the ground wire in parallel, and the second safety capacitor is connected between the live wire and the ground wire in parallel;
the rectifier circuit is a bridge rectifier circuit formed by a first diode, a second diode, a third diode and a fourth diode, the live wire is connected between the first diode and the third diode, and the zero wire is connected between the second diode and the fourth diode and is used for converting 220V alternating current into 310V direct current input voltage;
the slow start circuit is connected between the rectifying circuit and the bus circuit, the slow start circuit comprises a first thermosensitive circuit, a second thermosensitive resistor and a relay, a switch of the relay is controlled by a driving voltage of the IPM circuit, and the bus circuit comprises a first bus capacitor and a second bus capacitor which are connected in parallel, and a resistor and a power indicator lamp which are connected in parallel with the second bus capacitor.
3. The motor controller of claim 2 wherein the voltage conversion circuit employs TMG0565 as a switching power supply control chip for converting the 310V dc input voltage to a 15V supply voltage for powering the IPM circuit and a 15V isolation voltage for powering a radiator fan of the motor controller.
4. The motor controller of claim 3 wherein the voltage conversion circuit converts the 15V supply voltage to a 5V voltage via a first LDO regulator, converts the 5V voltage to a 3.3V voltage via a second LDO regulator to power the master control module, and converts the 15V isolation voltage to a 5V isolation voltage via a third LDO regulator to power the communication circuit.
5. The motor controller of claim 3 wherein the power module further comprises a fan drive circuit comprising an optocoupler, a first voltage divider resistor and a second voltage divider resistor, the first voltage divider resistor and the second voltage divider resistor being configured to divide the 15V isolated voltage to operate the cooling fan at a nominal operating voltage.
6. The motor controller of claim 1 wherein the IPM circuit comprises a PS21A29 smart power chip and an over-current protection circuit and a bootstrap circuit connected to the smart power chip,
the over-current protection circuit is used for converting the collected motor current into motor voltage through the sampling resistor, comparing the motor voltage with the threshold voltage through the voltage comparator, outputting an over-current signal to the IPM circuit by the voltage comparator when the motor voltage exceeds the threshold voltage, stopping the work of the IPM circuit, outputting a fault signal to the main control module, and stopping the output of the PWM driving signal by the main control module;
the bootstrap circuit comprises a current limiting resistor, a bootstrap diode, a bootstrap capacitor and a voltage stabilizing diode, wherein one end of the current limiting resistor is connected with 15V power supply voltage, the other end of the current limiting resistor is connected with the anode of the bootstrap diode, and the other end of the bootstrap diode is connected with the high end of the IPM bootstrap circuit; one end of the bootstrap capacitor is connected with the cathode of the bootstrap diode, and the other end of the bootstrap capacitor is connected with the low end of the IPM bootstrap circuit; the voltage stabilizing diode is connected in parallel with two ends of the bootstrap capacitor.
7. The motor controller of claim 1 wherein the communication circuit comprises an isolation chip, a communication chip and a TVS diode, the isolation chip is connected with the communication chip, the isolation chip employs pi 121U31, the communication chip employs MAX13487, and the TVS diode is disposed between the communication chip and the external interface.
8. The motor controller according to claim 1, wherein the motor control chip adopts IRMCF171, and peripheral circuits of the motor control chip comprise a 4MHz crystal oscillator circuit, a current acquisition circuit, a voltage acquisition circuit and a storage circuit,
the current acquisition circuit is used for acquiring motor current and outputting the motor current to the internal register, and the voltage acquisition circuit is used for acquiring fault voltage and bus voltage;
the storage circuit adopts an AT24C16 storage chip and is used for storing communication data between the motor controller and the upper computer and setting data for the communication circuit, wherein the setting data comprises an equipment ID number, a communication rate and motor steering.
9. The motor controller according to claim 1, wherein the upper computer is provided with motor control software for transmitting a motor speed regulation signal to the communication circuit and controlling the motor to start and stop according to a motor current, a bus voltage and a fault detection signal.
10. The motor controller of claim 9, further comprising a fault indicator, wherein different flashing frequencies of the fault indicator indicate different fault conditions.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310676350.9A CN116760332A (en) | 2023-06-08 | 2023-06-08 | Motor controller for shielding pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310676350.9A CN116760332A (en) | 2023-06-08 | 2023-06-08 | Motor controller for shielding pump |
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| CN116760332A true CN116760332A (en) | 2023-09-15 |
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| CN202310676350.9A Pending CN116760332A (en) | 2023-06-08 | 2023-06-08 | Motor controller for shielding pump |
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