CN111106782B - Ultra-high slip motor control apparatus - Google Patents
Ultra-high slip motor control apparatus Download PDFInfo
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- CN111106782B CN111106782B CN202010063385.1A CN202010063385A CN111106782B CN 111106782 B CN111106782 B CN 111106782B CN 202010063385 A CN202010063385 A CN 202010063385A CN 111106782 B CN111106782 B CN 111106782B
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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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/08—Controlling based on slip frequency, e.g. adding slip frequency and speed proportional frequency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
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- Control Of Electric Motors In General (AREA)
Abstract
The present invention provides an ultra-high slip motor control apparatus, comprising: the current sampling circuit is used for sampling the three-phase working current of the motor and respectively transmitting the obtained three-phase sampling current to the controller; the controller is used for judging whether the three-phase sampling current meets a preset torque switching condition or not, acquiring a target torque gear matched with the three-phase sampling current when the three-phase sampling current meets the torque switching condition, and generating a torque switching instruction according to the target torque gear; the output control circuit is respectively connected with each torque gear contact point of the motor and the passive contact point of the frequency converter and is used for carrying out torque gear switching control according to a torque switching instruction generated by the controller; and the power supply circuit is used for supplying power to each circuit module in the control equipment. The invention can automatically identify the load state in the running process of the motor and automatically switch to a proper torque gear according to the load state, thereby effectively improving the efficiency of the motor and achieving the purpose of saving electricity.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a control device of an ultrahigh slip ratio motor.
Background
The high slip electric motor has a plurality of operating torque gears, usually three gears high, medium and low. When in use, the motor is operated by adopting different suitable gears according to different loads, so that the efficiency of the motor is improved, and the aim of saving electricity is fulfilled. In practical application, the load is not fixed, or the load state can change in the working process, because how to provide the motor control ultrahigh-slip motor control device which can automatically identify the load state and can automatically switch to the proper torque gear has great significance. Moreover, there is currently no suitable solution.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned problems and to provide an ultra-high slip motor control apparatus.
The present invention provides an ultra-high slip motor control apparatus, comprising:
the current sampling circuit is used for sampling the three-phase working current of the motor and respectively transmitting the obtained three-phase sampling current to the controller;
the controller is used for judging whether the three-phase sampling current meets a preset torque switching condition or not, acquiring a target torque gear matched with the three-phase sampling current when the three-phase sampling current meets the preset torque switching condition, and generating a torque switching instruction according to the target torque gear;
the output control circuit is respectively connected with each torque gear contact point of the motor and the passive contact point of the frequency converter and is used for carrying out torque gear switching control according to a torque switching instruction generated by the controller;
and the power supply circuit is used for providing a first power supply and a second power supply for each circuit module in the control equipment.
The current sampling circuit comprises three current sampling sub-circuits which are used for sampling three-phase working current of the motor respectively;
each current sampling sub-circuit comprises a current transformer, a load resistor, a rectifying and filtering circuit module, an isolation resistor and a circuit protection module arranged at a signal output interface of the current sampling circuit, wherein the primary side of the current transformer is connected with any phase working current output end of the motor, the secondary side of the current transformer is respectively connected with two ends of the load resistor, the sampling current signal of the current transformer is converted into a voltage signal through the load resistor, the input end of the rectifying and filtering circuit module is connected with two ends of the load resistor so as to rectify and filter the voltage signal, the output end of the rectifying and filtering circuit module is connected with one end of the isolation resistor, the other end of the isolation resistor is connected with the controller so as to transmit the voltage signal to the controller through the isolation resistor, and the circuit protection module is used for preventing the sampled voltage signal from abnormally damaging the controller.
Wherein, still include: and the display circuit is connected with the controller and is used for respectively displaying the three-phase working current received by the controller.
The motor controller also comprises two input control circuits connected with the controller and used for respectively controlling the starting and stopping of the motor.
Each input control circuit comprises a first resistor, a second resistor, a first capacitor and a first photoelectric isolator;
one end of the first resistor is connected with a first power supply, the other end of the first resistor is connected with the anode of the light emitting diode at the input end of the first photoelectric isolator, the cathode of the light emitting diode at the input end of the first photoelectric isolator is connected with the input end of a control signal, one end of the second resistor is connected with a second power supply, the other end of the second resistor is connected with the collector of the phototransistor at the output end of the first photoelectric isolator, the collector of the phototransistor at the output end of the first photoelectric isolator is used as the output end of the input control circuit to be connected with the controller, the emitter of the phototransistor at the output end of the first photoelectric isolator is grounded, and the first capacitor is connected between the collector and the emitter of the phototransistor at the output end of the first photoelectric isolator.
The system also comprises a communication interface connected with the controller and used for reading the current working state of the motor and the three-phase sampling current;
the communication interface supports a Modbus RTU protocol, and the starting and stopping interfaces of the motor are connected to the output contact of the communication interface in parallel and used for remotely controlling the starting and stopping of the motor.
Wherein, the communication interface is an RS485 communication interface.
The device also comprises a working state display circuit connected with the controller and used for indicating the current working state and working gear state of the motor.
Wherein, the output control circuit is connected with four output control sub-circuits of the controller, each output control sub-circuit comprises a second photoelectric isolator, a third resistor, a fourth resistor, a first triode, a first diode and a relay, the anode of the light emitting diode at the input end of the second photoelectric isolator is connected with a second power supply, the cathode of the light emitting diode at the input end of the second photoelectric isolator is connected with the instruction output end of the controller, the collector of the phototransistor at the output end of the second photoelectric isolator is connected with the first power supply through the third resistor, the emitter of the phototransistor at the output end of the second photoelectric isolator is connected with one end of the fourth resistor, the other end of the fourth resistor is grounded, the base of the first triode is connected with the emitter of the phototransistor at the output end of the second photoelectric isolator, the collector of the first triode is respectively connected with the anode of the first diode and the control end of the relay, the cathode of the first diode is connected with a first power supply, the emitter of the first triode is grounded, the power supply end of the relay is connected with the first power supply, and the controlled electric shock of the relay is connected with a torque gear contact of the motor or a passive contact of the frequency converter.
The controller is specifically configured to extract current maximum values corresponding to the three-phase sampling currents in a preset detection period, calculate a current average value of the current maximum values corresponding to the three-phase sampling currents, and determine a torque switching mode of the motor according to a variation trend of the three-phase sampling currents, so as to determine whether the current average value meets a torque switching condition corresponding to a current torque switching mode;
wherein the torque switching mode includes a torque up-cut and a torque down-cut.
According to the ultrahigh slip ratio motor control equipment provided by the embodiment of the invention, after the motor is started or in the running process, the three-phase sampling current of the motor is sampled, when the three-phase sampling current meets the preset torque switching condition, the target torque gear matched with the current sampling current is obtained, and torque switching is executed according to the target torque gear, so that the load state can be automatically identified in the running process of the motor, the proper torque gear can be automatically switched according to the load state, the efficiency of the motor is effectively improved, and the purpose of saving electricity is achieved.
The above description is only an overview of the technical solutions of the present invention, and the present invention can be implemented in accordance with the content of the description so as to make the technical means of the present invention more clearly understood, and the above and other objects, features, and advantages of the present invention will be more clearly understood.
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 refer to like parts throughout the drawings. In the drawings:
fig. 1 is a block diagram showing the construction of an ultra-high slip motor control apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a current sampling sub-circuit in the ultra-high slip motor control apparatus according to an embodiment of the present invention;
FIG. 3 is a schematic circuit diagram of an input control circuit in the ultra-high slip motor control apparatus according to an embodiment of the present invention;
FIG. 4 is a schematic circuit diagram of a communication interface circuit in the ultra-high slip motor control apparatus according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of an output control sub-circuit in the ultra-high slip motor control apparatus according to the 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.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Fig. 1 is a block diagram schematically showing the construction of an ultra-high slip motor control apparatus according to an embodiment of the present invention. Referring to fig. 1, the ultra-high slip ratio motor control apparatus provided in the embodiment of the present invention specifically includes a current sampling circuit 10, a controller 20, an output control circuit 30, and a power supply circuit 40, where:
and the current sampling circuit 10 is used for sampling the three-phase working current of the motor and respectively transmitting the obtained three-phase sampling current to the controller 20.
And the controller 20 is configured to determine whether the three-phase sampling current meets a preset torque switching condition, obtain a target torque gear matched with the three-phase sampling current when the three-phase sampling current meets the preset torque switching condition, and generate a torque switching instruction according to the target torque gear. Specifically, the controller is specifically configured to extract current maximum values corresponding to the three-phase sampling currents in a preset detection period, calculate a current average value of the current maximum values corresponding to the three-phase sampling currents, and determine a torque switching mode of the motor according to a variation trend of the three-phase sampling currents, so as to determine whether the current average value meets a torque switching condition corresponding to a current torque switching mode; wherein the torque switching mode includes a torque up-cut and a torque down-cut.
And an output control circuit 30 connected to each torque shift point of the motor and a passive point of the inverter, respectively, for performing torque shift switching control in accordance with a torque switching command generated by the controller 20.
And a power supply circuit 40 for supplying a first power supply and a second power supply to the respective circuit blocks in the control device.
The first power supply is +12V direct current, and the second power supply is +5V direct current.
In this embodiment, the controller 20 is implemented by a single chip. The single chip microcomputer can be packaged by STC15F2K60S2 and LQFP 44. The internal clock circuit of the singlechip is used, and pins which are not used are directly suspended and are configured into a high-impedance state in software.
According to the ultrahigh slip ratio motor control equipment provided by the embodiment of the invention, after the motor is started or in the running process, the three-phase sampling current of the motor is sampled, when the three-phase sampling current meets the preset torque switching condition, the target torque gear matched with the current sampling current is obtained, and torque switching is executed according to the target torque gear, so that the load state can be automatically identified in the running process of the motor, the proper torque gear can be automatically switched according to the load state, the efficiency of the motor is effectively improved, and the purpose of saving electricity is achieved.
In this embodiment, the current sampling circuit 10 includes three current sampling sub-circuits, which are respectively used for sampling A, B, C three-phase working currents of the motor; as shown in fig. 2, each current sampling sub-circuit includes a current transformer TT1, a load resistor R68, a rectifying and filtering circuit module, an isolation resistor R59, and a circuit protection module disposed at a signal output interface of the current sampling circuit, a primary of the current transformer is connected to a corresponding one-phase working current output end of the motor, a secondary of the current transformer is connected to two ends of the load resistor R68, respectively, the sampled current signal of the current transformer is converted into a voltage signal through a load resistor R68, an input end of the rectifying and filtering circuit module is connected to two ends of the load resistor R68 to rectify and filter the obtained voltage signal, an output end of the rectifying and filtering circuit module is connected to one end of the isolation resistor R59, and the other end of the isolation resistor R59 is connected to a port P1.0 of the controller, the voltage signal is transmitted to the controller through an isolation resistor R59, and the circuit protection module is used for preventing the sampled voltage signal from abnormally damaging the controller.
Referring to fig. 2, the rectifying and filtering circuit module includes a diode D8, a capacitor C14, a capacitor C15, and a resistor R60, and the circuit protection module includes a diode D4, a diode D9, and a capacitor C16.
In this embodiment, the current sampling circuit of the control device is characterized by three-phase respective sampling, and is completed by using two stages of current transformers, as shown in fig. 2. The secondary of the second-stage current transformer converts the sampling current signal into a voltage signal through a load resistor R68, adopts Schottky diode D8 half-wave rectification and capacitance filtering and adjusts the voltage signal to a proper time constant through a load resistor, and sends the sampling signal to a P1.0 port of the single chip microcomputer through an isolation resistor R59. The current sampling output interface adopts D4 and D9 to form a protection circuit so as to prevent the sampling voltage from abnormally damaging the singlechip. The other two paths of current sampling sub-circuits respectively send sampling signals to the P1.1 port and the P1.2 port of the single chip microcomputer.
The ultrahigh slip ratio motor control device provided by the embodiment further comprises a display circuit, and the display circuit is connected with the controller and used for respectively displaying the three-phase working current received by the controller.
The control equipment adopts 3 groups of 4-bit common anode nixie tubes as display circuits, three-phase working currents are respectively displayed, and the display precision is 0.1A. The nixie tube is controlled by three 8-bit latches, the data input end of the latch is connected with the port P0 of the single chip microcomputer, and the latch control end is respectively connected with the ports P4.1, P4.2 and P4.3 of the single chip microcomputer. The display of each nixie tube is controlled by three levels respectively.
The control device for the ultra-high slip ratio motor further comprises two input control circuits connected with the controller and used for respectively controlling the starting and stopping of the motor.
As shown in fig. 3, each of the input control circuits includes a first resistor R1, a second resistor R2, a first capacitor C1, and a first photo-isolator IC 1; one end of the first resistor R1 is connected with +12V of a first power supply, the other end of the first resistor R1 is connected with the anode of a light emitting diode at the input end of the first photoelectric isolator IC1, the cathode 2 of the light emitting diode at the input end of the first photoelectric isolator IC1 is connected with the control signal input end X2, one end of the second resistor R2 is connected with +5V of a second power supply, the other end of the second resistor R2 is connected with the collector 4 of a photosensitive transistor at the output end of the first photoelectric isolator, the collector 4 of the photosensitive transistor at the output end of the first photoelectric isolator serves as the output end of the input control circuit and is connected with the controller, the emitter 3 of the photosensitive transistor at the output end of the first photoelectric isolator is grounded, and the first capacitor C1 is connected between the collector 4 and the emitter 3 of the photosensitive transistor at the output end of the first photoelectric isolator.
In this embodiment, the control device has 2 input terminals for respectively controlling the start and stop of the motor. As shown in fig. 3, the input circuit is isolated by photo-electricity and connected to the P4.4 port of the single chip, and the port is connected to a pull-up resistor R2 and a filter capacitor C1.
The ultrahigh slip ratio motor control device provided by this embodiment further includes a communication interface connected to the controller, and configured to read a current operating state of the motor and the three-phase sampling current;
the communication interface supports a Modbus RTU protocol, and the starting and stopping interfaces of the motor are connected to the output contact of the communication interface in parallel and used for remotely controlling the starting and stopping of the motor.
Wherein, the communication interface is an RS485 communication interface.
In a specific example, as shown in fig. 4, the control device is provided with an RS485 communication interface, supports a Modbus RTU protocol, can remotely control the start and stop of the motor, and can read the current working state and working current data. Referring to fig. 4, a MAX485 chip is adopted, and a data and control line are respectively connected to the P4.5, P4.6 and P4.7 ports of the single chip microcomputer.
The ultrahigh slip ratio motor control device provided by the embodiment further comprises a working state display circuit connected with the controller and used for indicating the current working state and working gear of the motor.
In a specific example, the operation state indicating circuit of the control device is completed by 10 light emitting diodes, and the indicating functions are power supply, test, fault, operation, stop, automatic, frequency conversion, high gear, medium gear and low gear. The frequency conversion, the high gear, the middle gear and the low gear are controlled by an output circuit, other functions except for power supply indication are controlled by a single chip microcomputer, and specifically, the frequency conversion, the high gear, the middle gear and the low gear are respectively connected to ports P3.0, P3.1, P2.4, P2.5 and P2.6 of the single chip microcomputer.
The ultrahigh slip ratio motor control device provided by the embodiment further comprises a controller sound prompting circuit connected with the controller, and the controller sound prompting circuit is composed of a buzzer. Specifically, the control signal can be output by a P3.6 port of the singlechip.
In the ultra-high slip motor control apparatus provided in this embodiment, the output control circuit 30 is connected to the four output control sub-circuits of the controller 20, as shown in fig. 5, each of the output control sub-circuits includes a second photo-isolator IC10, a third resistor R49, a fourth resistor R56, a first triode T3, a first diode D3 and a relay J3, an anode 1 of the light emitting diode at an input end of the second photo-isolator IC10 is connected to a second power supply +5V, a cathode 2 of the light emitting diode at an input end of the second photo-isolator IC10 is connected to a command output end of the controller, specifically, a cathode 2 of the light emitting diode at an input end of the second photo-isolator IC10 is connected to the command output end of the controller through a resistor, see R53 in fig. 5, a collector 4 of the photo-sensitive transistor at an output end of the second photo-isolator IC10 is connected to the first power supply +12V through the third photo-sensitive resistor R49, an emitter 3 of a phototransistor at the output end of the second photoelectric isolator is connected with one end of a fourth resistor R56, the other end of the fourth resistor R56 is grounded, a base of a first triode T3 is connected with the emitter 3 of the phototransistor at the output end of the second photoelectric isolator IC10, a collector of the first triode T3 is connected with an anode of the first diode D3 and the control end 3 of the relay J3, a cathode of the first diode D3 is connected with a first power supply +12V, an emitter of the first triode T3 is grounded, a power supply end of the relay is connected with the first power supply +12V, and a controlled electric shock of the relay J3 is connected with a torque blocking contact of the motor or a passive contact of the frequency converter.
The specific realization principle of the ultrahigh slip ratio motor control equipment provided by the embodiment of the invention is as follows:
after the motor is started or in the running process, three-phase real-time working current of the motor is obtained, the current maximum values corresponding to the three-phase real-time working current in a preset detection period are respectively extracted, and the current average value of the current maximum values corresponding to the three-phase real-time working current is calculated. Specifically, when a user presses a start button to trigger a start instruction or receives a start instruction remotely sent by the user, the controller is switched on by high-gear output to control high-torque start of the motor so as to ensure reliable start of the motor under a loading condition, and meanwhile, running indication reminding is carried out through a preset indicator lamp, and three-phase real-time working current can be displayed through a preset nixie tube. After a starting instruction is received and a certain starting time is delayed, the motor is started, the controller starts to monitor the working state of the motor, the detection period can be 1 minute, whether the load state parameter meets a preset torque switching condition or not is judged according to the current average value of the current maximum value corresponding to the three-phase real-time working current after the detection period, if yes, the torque switching mode of the motor is determined according to the variation trend of the three-phase real-time working current, wherein the torque switching mode comprises torque up-cutting and torque down-cutting; and judging whether the current average value meets a torque switching condition corresponding to the current torque switching mode. And when the current average value meets a preset torque switching condition, acquiring a target torque gear matched with the current average value, and executing torque switching according to the target torque gear so as to switch the motor to a proper torque gear.
The starting time can be set or modified by a user, and the default value can be set to be 3-10 seconds.
In one embodiment, the switching current value of the electric motor for switching from low gear to medium gear is set in the unit: a, range 1-300, default can be set to 48.5; the switching current value of the motor for switching from the middle gear to the high gear is as follows, unit: a, range 1-300, default value can be set to 69.4; the switching current value of the motor for switching from the middle gear to the high gear is as follows, unit: a, range 1-300, default can be set to 48.0; switching current value of the motor for switching from high gear to medium gear, unit: a, range 1-300, default value may be set to 68.9.
Specifically, when the switching current is set, the upper cutting current in the same gear should be larger than the lower cutting current, for example, the current for switching from the middle gear to the high gear is larger than the current for switching from the high gear to the middle gear, and a certain difference is required between the two current values, so as to prevent the contactor from frequently acting, performing unnecessary switching, and affecting the service life of the contactor.
Further, in the embodiment of the present invention, when one phase of real-time working current or multiple phases of real-time working current exists in the three phases of real-time working current of the motor and is greater than a preset safe current threshold, and the duration is greater than a preset time threshold, the overload protection operation is performed.
Wherein, the safe current threshold value used for the overload protection of the motor has the unit: a, range 1-300, default value may be set to 106.7.
Further, in the embodiment of the invention, when any phase current is lacked in the three-phase real-time working current of the motor, the open-phase protection operation is executed.
The invention can completely meet the requirements of the motor on efficiency and electricity saving, the controller monitors the load state of the motor in real time by sampling and processing the three-phase working current of the motor, and automatically switches to a proper torque gear according to corresponding motor operation parameters to keep the high-efficiency operation of the motor; during operation, if the load changes, the controller can automatically identify and switch to the corresponding proper gear.
According to the ultrahigh slip ratio motor control equipment provided by the embodiment of the invention, after the motor is started or in the running process, the three-phase sampling current of the motor is sampled, when the three-phase sampling current meets the preset torque switching condition, the target torque gear matched with the current sampling current is obtained, and torque switching is executed according to the target torque gear, so that the load state can be automatically identified in the running process of the motor, the proper torque gear can be automatically switched according to the load state, the efficiency of the motor is effectively improved, and the purpose of saving electricity is achieved.
Those skilled in the art will appreciate that while some embodiments herein include some features included in other embodiments, rather than others, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. An ultra-high slip motor control apparatus, comprising:
the current sampling circuit is used for sampling the three-phase working current of the motor and respectively transmitting the obtained three-phase sampling current to the controller;
the controller is used for judging whether the three-phase sampling current meets a preset torque switching condition or not, acquiring a target torque gear matched with the three-phase sampling current when the three-phase sampling current meets the preset torque switching condition, and generating a torque switching instruction according to the target torque gear;
the output control circuit is respectively connected with each torque gear contact point of the motor and the passive contact point of the frequency converter and is used for carrying out torque gear switching control according to a torque switching instruction generated by the controller;
the power supply circuit is used for providing a first power supply and a second power supply for each circuit module in the control equipment;
the controller is specifically configured to extract current maximum values corresponding to the three-phase sampling currents in a preset detection period, calculate a current average value of the current maximum values corresponding to the three-phase sampling currents, and determine a torque switching mode of the motor according to a variation trend of the three-phase sampling currents to determine whether the current average value meets a torque switching condition corresponding to a current torque switching mode;
the torque switching mode comprises torque up-switching and torque down-switching, and for the same gear, the current up-switching to the gear is larger than the current down-switching to the gear;
the current sampling circuit comprises three current sampling sub-circuits which are used for sampling the three-phase working current of the motor respectively;
each current sampling sub-circuit comprises a current transformer, a load resistor, a rectification filter circuit module, an isolation resistor and a circuit protection module arranged at a signal output interface of the current sampling circuit, wherein the primary side of the current transformer is connected with any phase working current output end of the motor, the secondary side of the current transformer is respectively connected with two ends of the load resistor, the sampling current signal of the current transformer is converted into a voltage signal through the load resistor, the input end of the rectification filter circuit module is connected with two ends of the load resistor so as to rectify and filter the voltage signal, the output end of the rectification filter circuit module is connected with one end of the isolation resistor, the other end of the isolation resistor is connected with the controller so as to transmit the voltage signal to the controller through the isolation resistor, the circuit protection module is used for preventing the sampled voltage signal from abnormally damaging the controller;
the output control circuit comprises four output control sub-circuits connected with the controller, each output control sub-circuit comprises a second photoelectric isolator, a third resistor, a fourth resistor, a first triode, a first diode and a relay, the anode of a light emitting diode at the input end of the second photoelectric isolator is connected with a second power supply, the cathode of the light emitting diode at the input end of the second photoelectric isolator is connected with the instruction output end of the controller, the collector of a phototransistor at the output end of the second photoelectric isolator is connected with the first power supply through the third resistor, the emitter of the phototransistor at the output end of the second photoelectric isolator is connected with one end of the fourth resistor, the other end of the fourth resistor is grounded, the base of the first triode is connected with the emitter of the phototransistor at the output end of the second photoelectric isolator, and the collector of the first triode is respectively connected with the anode of the first diode and the control end of the relay And the cathode of the first diode is connected with a first power supply, the emitter of the first triode is grounded, the power supply end of the relay is connected with the first power supply, and the controlled electric shock of the relay is connected with a torque blocking point of the motor or a passive point of the frequency converter.
2. The ultra-high slip motor control apparatus according to claim 1, further comprising:
and the display circuit is connected with the controller and is used for respectively displaying the three-phase working current received by the controller.
3. The ultra-high slip motor control apparatus of claim 1 further comprising a two-way input control circuit connected to said controller for controlling the starting and stopping of the motor, respectively.
4. The ultra-high slip motor control apparatus of claim 3 wherein each said input control circuit comprises a first resistor, a second resistor, a first capacitor and a first opto-isolator;
one end of the first resistor is connected with a first power supply, the other end of the first resistor is connected with the anode of the light emitting diode at the input end of the first photoelectric isolator, the cathode of the light emitting diode at the input end of the first photoelectric isolator is connected with the input end of a control signal, one end of the second resistor is connected with a second power supply, the other end of the second resistor is connected with the collector of the phototransistor at the output end of the first photoelectric isolator, the collector of the phototransistor at the output end of the first photoelectric isolator is used as the output end of the input control circuit to be connected with the controller, the emitter of the phototransistor at the output end of the first photoelectric isolator is grounded, and the first capacitor is connected between the collector and the emitter of the phototransistor at the output end of the first photoelectric isolator.
5. The ultra-high slip motor control apparatus of claim 1 further comprising a communication interface connected to said controller for reading a present operating state of the motor and said three phase sampled currents;
the communication interface supports a Modbus RTU protocol, and the starting and stopping interfaces of the motor are connected to the output contact of the communication interface in parallel and used for remotely controlling the starting and stopping of the motor.
6. The ultra-high slip motor control apparatus of claim 5 wherein said communication interface is an RS485 communication interface.
7. The ultra-high slip motor control apparatus of claim 1 further comprising an operating condition display circuit coupled to said controller for providing a status indication of the current operating condition and operating range of the motor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010063385.1A CN111106782B (en) | 2020-01-20 | 2020-01-20 | Ultra-high slip motor control apparatus |
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| CN202010063385.1A CN111106782B (en) | 2020-01-20 | 2020-01-20 | Ultra-high slip motor control apparatus |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014139201A1 (en) * | 2013-03-14 | 2014-09-18 | 中山大洋电机股份有限公司 | Automatic torque correction method of ecm motor used for replacing psc motor |
| CN104653768A (en) * | 2013-11-25 | 2015-05-27 | 陕西国力信息技术有限公司 | Brushless DC (direct current) motor for large-torque precise self-locking of automobile gear selecting |
| DE102014217959A1 (en) * | 2014-09-09 | 2016-03-10 | Bayerische Motoren Werke Aktiengesellschaft | Method and air conditioning device for air conditioning an interior of an electrically driven vehicle |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2269016Y (en) * | 1996-08-19 | 1997-11-26 | 甘立东 | Separate motor protector without external power |
| JP4766955B2 (en) * | 2005-08-23 | 2011-09-07 | 株式会社デンソー | Shift range switching device |
| US8298118B2 (en) * | 2009-07-27 | 2012-10-30 | GM Global Technology Operations LLC | Motor-assist shift control in a hybrid vehicle transmission |
| CN203851077U (en) * | 2014-02-17 | 2014-09-24 | 中国石油集团渤海石油装备制造有限公司 | Automatic output power conversion control system for multi-torque motors |
| CN207117520U (en) * | 2017-08-29 | 2018-03-16 | 高玉琴 | A kind of electricity-saving control cabinet of motor |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014139201A1 (en) * | 2013-03-14 | 2014-09-18 | 中山大洋电机股份有限公司 | Automatic torque correction method of ecm motor used for replacing psc motor |
| CN104653768A (en) * | 2013-11-25 | 2015-05-27 | 陕西国力信息技术有限公司 | Brushless DC (direct current) motor for large-torque precise self-locking of automobile gear selecting |
| DE102014217959A1 (en) * | 2014-09-09 | 2016-03-10 | Bayerische Motoren Werke Aktiengesellschaft | Method and air conditioning device for air conditioning an interior of an electrically driven vehicle |
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