CN110545052A - Control system for increasing starting torque of star connection three-phase motor - Google Patents
Control system for increasing starting torque of star connection three-phase motor Download PDFInfo
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- CN110545052A CN110545052A CN201910829611.XA CN201910829611A CN110545052A CN 110545052 A CN110545052 A CN 110545052A CN 201910829611 A CN201910829611 A CN 201910829611A CN 110545052 A CN110545052 A CN 110545052A
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- triode
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 57
- 238000005070 sampling Methods 0.000 claims abstract description 23
- 239000003990 capacitor Substances 0.000 claims description 22
- 230000003416 augmentation Effects 0.000 claims 7
- 238000000034 method Methods 0.000 description 15
- 238000010586 diagram Methods 0.000 description 10
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/02—Details of starting control
- H02P1/04—Means for controlling progress of starting sequence in dependence upon time or upon current, speed, or other motor parameter
-
- 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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
- H02P1/32—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor by star/delta switching
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
the invention relates to a control system for increasing starting torque of a star-connection three-phase motor, which comprises a three-phase power supply, a control module, a current sampling circuit, a conversion circuit and a three-phase motor, wherein the three-phase power supply is connected with the control module through a star-connection circuit; the current sampling circuit is used for acquiring the electrifying state of the three-phase motor, the control module is provided with a set value, the control module is used for outputting a control signal to the conversion circuit, the conversion circuit controls the conversion between the star connection and the delta connection of the three-phase motor according to the control signal, when the current sampling circuit detects that the three-phase motor is electrified, the control module is used for sending a first control signal to the conversion circuit, the conversion circuit converts the three-phase motor from the star connection to the delta connection, and when the time after starting exceeds the set value, the control module is used for sending a second control signal to the conversion circuit, and the conversion circuit converts the three-phase motor from the delta connection to the star connection. The torque starting of the three-phase motor is increased on the premise of the same voltage input.
Description
Technical Field
The invention relates to the technical field of three-phase motor control, in particular to a control system for increasing starting torque of a star-connection three-phase motor.
background
The technical requirements for the on-load starting of domestic new energy automobile compressor products and industrial cranes are increasingly higher, the on-load requirements of products are difficult to meet in the process of the star-connected three-phase motor on-load starting, the requirements for the torque and the power of the products can be met during normal operation, but the products cannot meet the requirements of customers due to the limitation of the market on the product cost and the volume. If the power of the three-phase motor is increased or the loaded starting is completed by adopting a PLC complex system, the product cost exceeds the expected cost of customers, and the structural space cannot be accommodated.
Disclosure of Invention
The invention aims to provide a control system for increasing starting torque of a star-connection three-phase motor, which solves the problems in the background technology.
In order to achieve the purpose, the invention adopts the following technical scheme: a star-connection three-phase motor starting torque increasing control system comprises a three-phase power supply, a control module, a current sampling circuit, a conversion circuit and a three-phase motor; the current sampling circuit is used for detecting the power-on state of the three-phase motor and sending power-on state information to the control module, the control module is provided with a set value, when the current sampling circuit detects that the three-phase motor is powered on, the control module is right the conversion circuit sends a first control signal, the conversion circuit converts the three-phase motor from star connection to delta connection, when the time after starting exceeds the set value, the control module is right the conversion circuit sends a second control signal, and the conversion circuit converts the three-phase motor from delta connection to star connection.
Further, still include interchange commentaries on classics direct current circuit, step-down circuit, interchange commentaries on classics direct current circuit with three phase current electric connection, interchange commentaries on classics direct current circuit is used for with three phase current's alternating current turns into DC power supply, step-down circuit with interchange commentaries on classics direct current circuit electric connection, step-down circuit is used for right interchange changes the DC power supply step-down of direct current circuit output, step-down circuit does the control module power supply.
Further, the U phase of the three-phase power supply is connected with the U1 phase of the three-phase motor, the V phase of the three-phase power supply is connected with the V1 phase of the three-phase motor, the W phase of the three-phase power supply is connected with the W1 phase of the three-phase motor, when the three-phase motor is not powered on, the U2 phase of the three-phase motor, the V2 phase of the three-phase motor and the W2 phase of the three-phase motor are connected with each other, when the conversion circuit receives a first control signal, the W2 phase of the three-phase motor is connected with the U phase of the three-phase power supply, the V2 phase of the three-phase motor is connected with the W phase of the three-phase power supply, and the U2 phase of the three-phase.
Further, the conversion circuit comprises a first conversion part, a second conversion part and a third conversion part, wherein the first conversion part comprises a triode Q1 and a contactor KM1, a coil of the contactor KM1 is connected in series between a direct current power supply and a collector of the triode Q1, a pair of normally closed contacts of the contactor KM1 are respectively connected with a W2 end and a V2 end of the three-phase motor, a pair of normally open contacts of the contactor KM1 are respectively connected with a U2 end of the three-phase motor and a U phase of the three-phase power supply, the second conversion part comprises a triode Q2 and a contactor KM2, a coil of the contactor KM2 is connected in series between a direct current power supply and a collector of the triode Q2, a pair of normally closed contacts of the contactor KM2 are respectively connected with a V2 end and a U2 end of the three-phase motor, a pair of normally open contacts of the contactor KM2 are respectively connected with a V2 end of the three-phase, the third conversion part comprises a triode Q3 and a contactor KM3, a coil of the contactor KM3 is connected in series between a direct current power supply and a collector of the triode Q3, a pair of normally closed contacts of the contactor KM3 are respectively connected with a U2 end and a W2 end of the three-phase motor, a pair of normally open contacts of the contactor KM3 are respectively connected with a U2 end of the three-phase motor and a V-phase of the three-phase power supply, when the control module outputs high levels to the triode Q1, the triode Q2 and the triode Q3, the coil of the contactor KM1, the coil of the contactor KM2 and the coil of the contactor KM3 are all powered, and the three-phase motor is converted from a star connection to a delta connection.
Further, the current sampling circuit comprises a current transformer, a diode D15, a capacitor C14, a resistor R13, a diode D16 and a capacitor C15, the current transformer is installed on a power supply line of a three-phase power supply, an anode of the diode D15 is connected with one end of the current transformer, a cathode of the diode D15 is respectively connected with an anode of the capacitor C14, one end of the resistor R13, a cathode of the diode D16 and one end of the capacitor C15, and the other end of the current transformer, the cathode of the capacitor C14, the other end of the resistor R13, the anode of the diode D16 and the other end of the capacitor C15 are all grounded.
Further, the control module comprises a single-chip microcomputer PIC16F73 and a clock circuit, the clock circuit is respectively connected with a pin 9 and a pin 10 of the single-chip microcomputer PIC16F73, a common end between a negative electrode of the diode D16 and the capacitor C15 is connected with a pin 2 of the single-chip microcomputer PIC16F73, and when the three-phase motor is started, the current sampling circuit sends a high level to the pin 2 of the single-chip microcomputer PIC16F 73.
Further, a voltage dividing resistor R6, a voltage dividing resistor R9 and a voltage dividing resistor R14 are arranged between the control module and the conversion circuit, one end of the voltage dividing resistor R6 is connected with a pin 21 of the single chip microcomputer PIC16F73, the other end of the voltage dividing resistor R6 is connected with a base of the triode Q1, one end of the voltage dividing resistor R9 is connected with a pin 23 of the single chip microcomputer PIC16F73, the other end of the voltage dividing resistor R9 is connected with a base of the triode Q2, one end of the voltage dividing resistor R14 is connected with a pin 22 of the single chip microcomputer PIC16F73, the other end of the voltage dividing resistor R14 is connected with a base of the triode Q3, and when the three-phase motor is started, the pin 21, the pin 22 and the pin 23 of the single chip microcomputer PIC16F73 all emit high levels.
Further, a diode D9 is further arranged between the collector of the triode Q1 and the direct-current power supply, the diode D9 is connected in parallel with the coil of the contactor KM1, a diode D13 is further arranged between the collector of the triode Q2 and the direct-current power supply, the diode D13 is connected in parallel with the coil of the contactor KM2, a diode D17 is further arranged between the collector of the triode Q3 and the direct-current power supply, and the diode D17 is connected in parallel with the coil of the contactor KM 3.
The invention has the beneficial effects that: the star connection method is converted into the delta connection method when the three-phase motor is started, so that enough starting current is ensured when the three-phase motor is started, torque starting is increased on the premise of inputting the same voltage, time delay switching from the delta connection method to the star connection method when the three-phase motor is started is realized through timing of control module software, namely, normal operation of the three-phase motor is recovered to rated torque after high-torque starting, and the requirements of a product on the torque and the power of the three-phase motor during normal operation are met.
Drawings
the figures further illustrate the invention, but the examples in the figures do not constitute any limitation of the invention.
Fig. 1 is a circuit diagram of an ac-dc converter according to an embodiment of the present invention;
FIG. 2 is a diagram of a conversion circuit;
FIG. 3 is a main schematic diagram of a control module;
FIG. 4 is an external circuit diagram of the control module;
FIG. 5 is a connection diagram of the external components of the control module;
FIG. 6 is a circuit diagram of a three-phase motor;
FIG. 7 is a current sampling circuit diagram;
FIG. 8 is a voltage step-down circuit diagram;
FIG. 9 is a schematic diagram of an overall structure provided by an embodiment of the present invention;
Fig. 10 is a block flow diagram provided by an embodiment of the invention.
Detailed Description
As shown in fig. 1 to 9, a star-connected three-phase motor control system for increasing starting torque according to an embodiment of the present invention includes a three-phase power supply, a control module, a current sampling circuit, a conversion circuit, a three-phase motor, an ac-to-dc circuit, and a voltage reduction circuit. The alternating current-to-direct current conversion circuit is electrically connected with the three-phase power supply, the alternating current-to-direct current conversion circuit is used for converting 380V alternating current of the three-phase power supply into a 12V direct current power supply, the voltage reduction circuit is electrically connected with the alternating current-to-direct current conversion circuit, the voltage reduction circuit reduces the voltage of the 12V direct current power supply output by the alternating current-to-direct current conversion circuit into 5V direct current, and the voltage reduction circuit provides 5V direct current for the control module. The current sampling circuit is used for detecting the power-on state of the three-phase motor and sending power-on state information to the control module, the control module is provided with a set value, in the embodiment, the set value is 2s, and in other embodiments, a user can properly adjust the set value according to actual needs. The control module outputs a signal to the conversion circuit according to the electrifying state information, the conversion circuit controls the conversion between the star connection and the delta connection of the three-phase motor according to the signal, when the current sampling circuit detects that the three-phase motor is electrified, the control module sends a first control signal to the conversion circuit, the conversion circuit converts the star connection of the three-phase motor into the delta connection, when the time after starting exceeds a set value, the control module sends a second control signal to the conversion circuit, and the conversion circuit converts the delta connection of the three-phase motor into the star connection. The star connection method is converted into the delta connection method when the three-phase motor is started, so that enough starting current is ensured when the three-phase motor is started, torque starting is increased on the premise of inputting the same voltage, delay switching from the delta connection method to the star connection method when the three-phase motor is started is realized through control module software timing or a time base circuit, namely, normal operation of the three-phase motor is recovered to rated torque after the high-torque motor is started, and the requirements of a product on the torque and the power of the three-phase motor during normal operation are met.
As shown in fig. 2 to 9, the U phase of the three-phase power is connected to the U1 terminal of the three-phase motor, the V phase of the three-phase power is connected to the V1 terminal of the three-phase motor, and the W phase of the three-phase power is connected to the W1 terminal of the three-phase motor. The conversion circuit comprises a first conversion part, a second conversion part and a third conversion part, wherein the first conversion part comprises a triode Q1 and a contactor KM1, a coil of a contactor KM1 is connected between a direct current power supply and a collector of the triode Q1 in series, a pair of normally closed contacts of a contactor KM1 are respectively connected with a W2 end and a V2 end of the three-phase motor, a pair of normally open contacts of a contactor KM1 are respectively connected with a U2 end of the three-phase motor and a U phase of the three-phase power supply, the second conversion part comprises a triode Q2 and a contactor KM2, a coil of a contactor KM2 is connected between the direct current power supply and a collector of the triode Q2 in series, a pair of normally closed contacts of the contactor KM2 are respectively connected with a V2 end and a U2 end of the three-phase motor, a pair of normally open contacts of the contactor KM2 are respectively connected with a V2 end of the three, the third conversion part comprises a triode Q3 and a contactor KM3, wherein a coil of the contactor KM3 is connected between a direct current power supply and a collector of the triode Q3 in series, a pair of normally closed contacts of the contactor KM3 are respectively connected with a U2 end and a W2 end of the three-phase motor, and a pair of normally open contacts of the contactor KM3 are respectively connected with a U2 end of the three-phase motor and a V phase of the three-phase power supply. When the control module respectively to triode Q1, triode Q2 with triode Q3 output high level, triode Q1, triode Q2 with triode Q3 all switches on, the coil of contactor KM1, the coil of contactor KM2 and the coil of contactor KM3 all get electric, the end of W2 of three-phase motor with the U looks circular telegram of three-phase power, the end of V2 of three-phase motor with the W looks circular telegram of three-phase power, the end of U2 of three-phase motor with the V looks circular telegram of three-phase power, the three-phase motor is from star connection to triangle connection. The switching circuit can control the three-phase motor to switch between a star connection method and a delta connection method according to the output high level or the output low level of the control module, and the control method is simple, strong in anti-interference performance and quick in response.
as shown in fig. 1 to 9, the current sampling circuit comprises a current transformer, a diode D15, a capacitor C14, a resistor R13, a diode D16 and a capacitor C15, wherein the model of the current transformer is DL-CT03CL1.0, and the current transformer is sleeved on a power supply wire of a W phase of the three-phase power supply. The anode of the diode D15 is connected to one end of the current transformer, the cathode of the diode D15 is connected to the anode of the capacitor C14, one end of the resistor R13, the cathode of the diode D16 and one end of the capacitor C15, respectively, and the other end of the current transformer, the cathode of the capacitor C14, the other end of the resistor R13, the anode of the diode D16 and the other end of the capacitor C15 are all grounded. And a common end between the cathode of the diode D16 and the capacitor C15 is a signal output end of the whole current sampling circuit, when the current transformer detects that current flows through a power supply line of the W phase of the three-phase power supply, the signal output end of the current sampling circuit outputs high level, and at the moment, the three-phase motor starts to rotate after being electrified. The control module comprises a single-chip microcomputer PIC16F73 and a clock circuit, the clock circuit is respectively connected with a pin No. 9 and a pin No. 10 of the single-chip microcomputer PIC16F73, a negative electrode of a diode D16 and a common end between capacitors C15 are connected with a pin No. 2 of the single-chip microcomputer PIC16F73, when the three-phase motor is started, the current sampling circuit sends a high level to the pin No. 2 of the single-chip microcomputer PIC16F73, and the control module can learn the running condition of the three-phase motor through the current sampling circuit.
as shown in fig. 1-10, a voltage dividing resistor R6, a voltage dividing resistor R9, and a voltage dividing resistor R14 are disposed between the control module and the conversion circuit, one end of the voltage dividing resistor R6 is connected to pin 21 of the single-chip microcomputer PIC16F73, the other end of the voltage dividing resistor R6 is connected to the base of the transistor Q1, one end of the voltage dividing resistor R9 is connected to pin 23 of the single-chip microcomputer PIC16F73, the other end of the voltage dividing resistor R9 is connected to the base of the transistor Q2, one end of the voltage dividing resistor R14 is connected to pin 22 of the single-chip microcomputer PIC16F73, the other end of the voltage dividing resistor R14 is connected to the base of the transistor Q3, when the three-phase motor is started, pin 21 of the single-chip microcomputer PIC16F73 sends a high level to the base of the transistor Q1, pin 22 of the single-chip microcomputer PIC16F73 sends a high level to the base of the transistor Q3, and the No. 23 pin of the singlechip PIC16F73 and the base of the triode Q2 send high level. Still be equipped with diode D9 between triode Q1's the collecting electrode and the DC power supply, diode D9 with contactor KM 1's coil is parallelly connected, still be equipped with diode D13 between triode Q2's the collecting electrode and the DC power supply, diode D13 with contactor KM 2's coil is parallelly connected, still be equipped with diode D17 between triode Q3's collecting electrode and the DC power supply, diode D17 with contactor KM 3's coil is parallelly connected. In addition, still be connected with LED lamp D10 and divider resistor R4 between triode Q1's the collecting electrode and the DC power supply, still be connected with LED lamp D13 and divider resistor R7 between triode Q2's the collecting electrode and the DC power supply, still be connected with LED lamp D18 and divider resistor R10 between triode Q3's the collecting electrode and the DC power supply, when the three-phase motor truns into the triangle-shaped method, LED lamp D10, LED lamp D13 and LED lamp D18 is luminous, and convenience of customers learns that the three-phase motor converts the triangle-shaped method into. When the program of the control module is started, self-checking is carried out on the program of the control module, then whether the three-phase motor is electrified or not is detected through the current sampling circuit, if the three-phase motor is electrified, the star connection of the three-phase motor is converted into the delta connection, then the time elapsed after the start is detected, and when the time exceeds 2s, the star connection of the three-phase motor is converted into the delta connection, and then the switching process is completed.
the technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (8)
1. A star connection three-phase motor increases control system of start-up moment, characterized by comprising:
The device comprises a three-phase power supply, a control module, a current sampling circuit, a conversion circuit and a three-phase motor;
The current sampling circuit is used for detecting the power-on state of the three-phase motor and sending power-on state information to the control module, the control module is provided with a set value, when the current sampling circuit detects that the three-phase motor is powered on, the control module is right the conversion circuit sends a first control signal, the conversion circuit converts the three-phase motor from star connection to delta connection, when the time after starting exceeds the set value, the control module is right the conversion circuit sends a second control signal, and the conversion circuit converts the three-phase motor from delta connection to star connection.
2. The star-connected three-phase motor starting torque augmentation control system of claim 1, wherein: still include interchange commentaries on classics direct current circuit, step-down circuit, interchange change direct current circuit with three phase current electric connection, interchange change direct current circuit be used for with three phase current's alternating current turns into DC power supply, step-down circuit with interchange changes direct current circuit electric connection, step-down circuit is used for right interchange changes the DC power supply step-down of direct current circuit output, step-down circuit does the control module power supply.
3. The star-connected three-phase motor starting torque augmentation control system of claim 1, wherein: the U phase of the three-phase power supply is connected with the U1 end of the three-phase motor, the V phase of the three-phase power supply is connected with the V1 end of the three-phase motor, the W phase of the three-phase power supply is connected with the W1 end of the three-phase motor, when the three-phase motor is not electrified, the U2 end of the three-phase motor, the V2 end of the three-phase motor and the W2 end of the three-phase motor are connected with each other, when the conversion circuit receives a first control signal, the W2 end of the three-phase motor is connected with the U phase of the three-phase power supply, the V2 end of the three-phase motor is connected with the W phase of the three-phase power supply, and the U2 end of the three-.
4. The star-connected three-phase motor starting torque augmentation control system of claim 3, wherein: the conversion circuit comprises a first conversion part, a second conversion part and a third conversion part, wherein the first conversion part comprises a triode Q1 and a contactor KM1, a coil of a contactor KM1 is connected between a direct current power supply and a collector of the triode Q1 in series, a pair of normally closed contacts of a contactor KM1 are respectively connected with a W2 end and a V2 end of the three-phase motor, a pair of normally open contacts of a contactor KM1 are respectively connected with a U2 end of the three-phase motor and a U phase of the three-phase power supply, the second conversion part comprises a triode Q2 and a contactor KM2, a coil of a contactor KM2 is connected between the direct current power supply and a collector of the triode Q2 in series, a pair of normally closed contacts of the contactor KM2 are respectively connected with a V2 end and a U2 end of the three-phase motor, a pair of normally open contacts of the contactor KM2 are respectively connected with a V2 end of the three, the third conversion part comprises a triode Q3 and a contactor KM3, a coil of the contactor KM3 is connected in series between a direct current power supply and a collector of the triode Q3, a pair of normally closed contacts of the contactor KM3 are respectively connected with a U2 end and a W2 end of the three-phase motor, a pair of normally open contacts of the contactor KM3 are respectively connected with a U2 end of the three-phase motor and a V-phase of the three-phase power supply, when the control module outputs high levels to the triode Q1, the triode Q2 and the triode Q3, the coil of the contactor KM1, the coil of the contactor KM2 and the coil of the contactor KM3 are all powered, and the three-phase motor is converted from a star connection to a delta connection.
5. the star-connected three-phase motor starting torque augmentation control system of claim 4, wherein: the current sampling circuit comprises a current transformer, a diode D15, a capacitor C14, a resistor R13, a diode D16 and a capacitor C15, wherein the current transformer is installed on a power supply line of a three-phase power supply, the anode of the diode D15 is connected with one end of the current transformer, the cathode of the diode D15 is respectively connected with the anode of the capacitor C14, one end of the resistor R13, the cathode of the diode D16 and one end of the capacitor C15, and the other end of the current transformer, the cathode of the capacitor C14, the other end of the resistor R13, the anode of the diode D16 and the other end of the capacitor C15 are all grounded.
6. The star-connected three-phase motor starting torque augmentation control system of claim 5, wherein: the control module comprises a single-chip microcomputer PIC16F73 and a clock circuit, the clock circuit is respectively connected with a pin No. 9 and a pin No. 10 of the single-chip microcomputer PIC16F73, a common end between a negative electrode of the diode D16 and the capacitor C15 is connected with a pin No. 2 of the single-chip microcomputer PIC16F73, and when the three-phase motor is started, the current sampling circuit sends a high level to the pin No. 2 of the single-chip microcomputer PIC16F 73.
7. The star-connected three-phase motor starting torque augmentation control system of claim 6, wherein: a voltage dividing resistor R6, a voltage dividing resistor R9 and a voltage dividing resistor R14 are arranged between the control module and the conversion circuit, one end of the voltage dividing resistor R6 is connected with a 21 pin of the single chip microcomputer PIC16F73, the other end of the voltage dividing resistor R6 is connected with a base of the triode Q1, one end of the voltage dividing resistor R9 is connected with a 23 pin of the single chip microcomputer PIC16F73, the other end of the voltage dividing resistor R9 is connected with a base of the triode Q2, one end of the voltage dividing resistor R14 is connected with a 22 pin of the single chip microcomputer PIC16F73, the other end of the voltage dividing resistor R14 is connected with a base of the triode Q3, and when the three-phase motor is started, the 21 pin, the 22 pin and the 23 pin of the single chip microcomputer PIC16F73 all emit high level.
8. The star-connected three-phase motor starting torque augmentation control system of claim 3, wherein: still be equipped with diode D9 between triode Q1's the collecting electrode and the DC power supply, diode D9 with contactor KM 1's coil is parallelly connected, still be equipped with diode D13 between triode Q2's the collecting electrode and the DC power supply, diode D13 with contactor KM 2's coil is parallelly connected, still be equipped with diode D17 between triode Q3's collecting electrode and the DC power supply, diode D17 with contactor KM 3's coil is parallelly connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910829611.XA CN110545052A (en) | 2019-09-03 | 2019-09-03 | Control system for increasing starting torque of star connection three-phase motor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910829611.XA CN110545052A (en) | 2019-09-03 | 2019-09-03 | Control system for increasing starting torque of star connection three-phase motor |
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| CN110545052A true CN110545052A (en) | 2019-12-06 |
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| US20020079862A1 (en) * | 2000-12-22 | 2002-06-27 | Shepeck Matthew A. | Method of controlling three phase motor starting sequence |
| CN101101003A (en) * | 2007-07-29 | 2008-01-09 | 太原理工大学 | Mine single lane tunneling aeration machine integrated control system |
| CN108336747A (en) * | 2018-04-09 | 2018-07-27 | 西安仪科自动化有限责任公司 | A kind of star-like energy saving in running switch board of beam pumping unit turn |
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2019
- 2019-09-03 CN CN201910829611.XA patent/CN110545052A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2037122U (en) * | 1988-06-27 | 1989-05-03 | 上海起重机械运输厂 | Power saving controller |
| US20020079862A1 (en) * | 2000-12-22 | 2002-06-27 | Shepeck Matthew A. | Method of controlling three phase motor starting sequence |
| CN101101003A (en) * | 2007-07-29 | 2008-01-09 | 太原理工大学 | Mine single lane tunneling aeration machine integrated control system |
| CN108336747A (en) * | 2018-04-09 | 2018-07-27 | 西安仪科自动化有限责任公司 | A kind of star-like energy saving in running switch board of beam pumping unit turn |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20191206 |
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| RJ01 | Rejection of invention patent application after publication |