CN114720785A - Motor with three-phase power supply open-phase detection function and power supply open-phase detection method - Google Patents
Motor with three-phase power supply open-phase detection function and power supply open-phase detection method Download PDFInfo
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- CN114720785A CN114720785A CN202210658791.1A CN202210658791A CN114720785A CN 114720785 A CN114720785 A CN 114720785A CN 202210658791 A CN202210658791 A CN 202210658791A CN 114720785 A CN114720785 A CN 114720785A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/16—Measuring asymmetry of polyphase networks
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/54—Testing for continuity
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/24—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage
- H02H3/253—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to undervoltage or no-voltage for multiphase applications, e.g. phase interruption
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
- H02H7/09—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against over-voltage; against reduction of voltage; against phase interruption
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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
- H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
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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
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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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
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Abstract
The invention discloses a motor with a three-phase power supply default phase detection function and a power supply default phase detection method, wherein a detection system comprises a motor monomer and a motor controller, the motor controller comprises a microprocessor MCU, an inverter circuit and a three-phase power supply default phase detection circuit, the microprocessor MCU controls the motor monomer through the inverter circuit, the three-phase power supply default phase detection circuit is used for sampling a real-time phase voltage U0 of a three-phase power supply U, V, W and transmitting a signal to the microprocessor MCU, the three-phase power supply default phase detection circuit comprises three rectifying circuits and a voltage reduction circuit, the input ends of the three rectifying circuits are respectively connected with a three-phase power supply U, V, W, the three rectifying circuits are connected with the microprocessor MCU through the voltage reduction circuit, the microprocessor MCU compares the real-time phase voltage U0 with a set voltage U1, and records the comparison result of the sizes of U0 and U1 once every a period of time T and counts the comparison result, and the microprocessor MCU judges whether the phase is lost or not according to the counting result, and if the phase is lost, the microprocessor MCU controls the inverter circuit to stop the machine.
Description
Technical Field
The invention belongs to the technical field of motors, and particularly relates to a motor with a three-phase power supply open-phase detection function and a power supply open-phase detection method.
Background
In the industry, regarding a three-phase motor, usually, only the three-phase open-phase protection of a motor part is considered, but the power end is not monitored by neglecting the three-phase input of a power supply part, so that when the power supply is in a phase-failure state, a product cannot detect abnormality and continues to operate, and finally the product is damaged, and the reliability of the product is poor, in order to solve the above problems, the applicant has previously proposed a circuit scheme for detecting the open-phase of the three-phase power supply, and specifically, reference is made to the following bulletin numbers: CN 215728707U, patent name: the utility model provides a motor controller's of three phase current lacks looks detection circuitry and BLDC motor utility model patent, the three phase current that this scheme provided lacks looks detection circuitry includes 3 ways rectifier circuit, step-down circuit and comparison circuit, three phase current U, V, W is connected respectively to 3 ways rectifier circuit's input, 3 ways rectifier circuit's output links together as step-down circuit's input, step-down circuit's output is connected to comparison circuit's input, comparison circuit's output lacks looks signal output part as three phase current and is connected to microprocessor MCU's AD port, microprocessor MCU judges whether the power lacks the looks according to comparison circuit's output signal, if lack the looks, microprocessor MCU control inverter circuit shuts down the operation, the decision principle of this scheme is as follows: the voltage of the three-phase power supply U, V, W is rectified by the rectifying circuit and the voltage reducing circuit, and waveform signals are transmitted into the comparison circuit after voltage reduction, a comparator of the comparison circuit outputs high level signals or low level signals to the microprocessor MCU according to the comparison result of the phase voltage and the reference voltage, the microprocessor MCU judges whether to enter power supply open-phase protection through the level signals transmitted by the comparator, whether the power supply is open-phase can be detected through the scheme, when the input power supply is detected to be open-phase, shutdown operation can be immediately carried out, components and parts are protected, the stability and the reliability of the circuit are improved, and the circuit structure is simple.
However, the three-phase power supply open-phase detection circuit is provided with the comparison circuit, so that the three-phase power supply open-phase detection circuit is complex in structure, the number of used electronic components is large, a circuit board with a large area is required to be used in design, and the manufacturing cost of the motor is high.
Disclosure of Invention
The invention aims to provide a motor with a three-phase power supply open-phase detection function and a power supply open-phase detection method, which can solve the technical problems that a three-phase power supply open-phase detection circuit in the prior art is provided with a comparison circuit, so that the three-phase power supply open-phase detection circuit is complex in structure, a large number of electronic components are used, a circuit board with a large area is required, and the manufacturing cost of the motor is high.
The purpose of the invention is realized by the following technical scheme.
One object of the present invention is to provide a motor with a three-phase power supply open-phase detection function, comprising:
the motor unit comprises a stator assembly and a rotor assembly;
the motor controller comprises a power supply circuit, a microprocessor MCU, an inverter circuit and a three-phase power supply phase-failure detection circuit, wherein a three-phase power supply U, V, W is connected to the input end of the power supply circuit, the power supply circuit supplies power to each circuit, the microprocessor MCU controls a motor monomer through the inverter circuit, and the three-phase power supply phase-failure detection circuit is used for sampling a real-time phase voltage U0 of the three-phase power supply U, V, W and transmitting a signal to the microprocessor MCU;
three-phase power supply phase failure detection circuitry includes three routes rectifier circuit and step-down circuit, three-phase power U, V, W is connected respectively to three routes rectifier circuit's input, three routes rectifier circuit's output links together as the input of step-down circuit, the output of step-down circuit connects microprocessor MCU's input as signal output part, microprocessor MCU compares real-time looks voltage U0 and the size of settlement voltage U1, and every interval time T record once U0 and U1's big or small comparison result and count, microprocessor MCU judges according to the count result whether lack of the phase, if lack of the phase, microprocessor MCU control inverter circuit carries out shutdown operation.
Preferably, the microprocessor MCU includes an I/O port and an a/D port, and the output terminal of the voltage-reducing circuit is connected to the I/O port of the microprocessor or the a/D port of the microprocessor.
Preferably, when the output end of the voltage reduction circuit is connected to the I/O port, if the real-time phase voltage U0 of the three-phase power supply U, V, W is smaller than the set voltage U1 of the I/O port, the microprocessor MCU determines that the I/O port is a low-level input, and if the real-time phase voltage U0 of the three-phase power supply U, V, W is larger than the set voltage U1 of the I/O port, the microprocessor MCU determines that the I/O port is a high-level input;
the microprocessor MCU records the signal input condition of the I/O port once every a period of time T and counts, when the microprocessor MCU continuously records the low level input of the I/O port for a plurality of times, the microprocessor MCU judges that the phase is lost, enters a power supply phase loss protection mode, and controls the inverter circuit to stop operating.
Preferably, in the power supply open-phase protection mode, if the microprocessor MCU continuously records that the I/O port is a high level input for multiple times and the number of times of the high level input of the I/O port is more than a set number of times, the microprocessor MCU determines that the three-phase power supply U, V, W is recovered to be normal, and exits the power supply open-phase protection mode, and the microprocessor MCU controls the motor unit to operate through the inverter circuit.
Preferably, when the output end of the voltage reduction circuit is connected with the a/D port, the microprocessor MCU records the comparison result between the real-time phase voltage U0 and the set voltage U1 of the a/D port once at intervals of time T and counts the comparison result, and when the microprocessor MCU continuously records that U0 is greater than U1 for multiple times, the microprocessor MCU determines that the phase is open, and enters a power supply open-phase protection mode, and the microprocessor MCU controls the inverter circuit to perform shutdown operation.
Preferably, in the power supply open-phase protection mode, if the microprocessor MCU continuously records that the real-time phase voltage U0 is greater than the set voltage U1 for a plurality of times and the number of times that U0 is greater than U1 is greater than the set number of times, the microprocessor MCU determines that the three-phase power U, V, W is recovered to normal, and exits the power supply open-phase protection mode, and the microprocessor MCU controls the operation of the motor unit through the inverter circuit.
Preferably, the three-phase power supply open-phase detection circuit further comprises a clamping circuit, the clamping circuit is electrically connected between the voltage reduction circuit and the microprocessor MCU, and the voltage reduction circuit comprises a plurality of resistors connected in series.
Another object of the present invention is to provide a power supply open-phase detection method for a motor with a three-phase power supply open-phase detection function, wherein the motor adopts the above-mentioned motor with a three-phase power supply open-phase detection function, and the power supply open-phase detection method comprises the following steps:
step 1: the microprocessor MCU acquires a real-time phase voltage U0 of the three-phase power supply U, V, W, compares the real-time phase voltage U0 with a set voltage U1, records the comparison result of the sizes of U0 and U1 once every a period of time T, and counts;
step 2: judging whether the real-time phase voltage U0 is continuously recorded by the microprocessor MCU for multiple times and is smaller than the set voltage U1, if so, judging that the three-phase power supply U, V, W is in a phase-lacking state by the microprocessor MCU, entering a power supply phase-lacking protection mode, controlling the inverter circuit to stop the operation by the microprocessor MCU, and if not, returning to the step 1;
and step 3: and under the power supply open-phase protection mode, judging whether the real-time phase voltage U0 is continuously recorded by the microprocessor MCU for multiple times and is greater than the set voltage U1, wherein the times that U0 is greater than U1 are more than the set times, if so, judging that the three-phase power supply U, V, W is normal by the microprocessor MCU, exiting the power supply open-phase protection mode, controlling the motor to operate by the microprocessor MCU through an inverter circuit, and if not, returning to the step 1.
Compared with the prior art, the invention has the following effects:
1) the motor with the three-phase power supply open-phase detection function provided by the invention has the advantages that the voltage provided by the three-phase power supply U, V, W is rectified and reduced by the three rectifying circuits and the voltage reducing circuit, then a waveform signal is transmitted to the microprocessor MCU, the microprocessor MCU compares the real-time phase voltage U0 with the set voltage U1, the comparison results of the U0 and the U1 are recorded once every a period of time T and counted, the microprocessor MCU judges whether the open phase exists or not according to the counting result, if the open phase exists, the microprocessor MCU controls the inverter circuit to stop the operation, the open-phase detection of the three-phase power supply is directly completed by the microprocessor MCU, a comparison circuit is not required to be arranged in the open-phase detection circuit of the three-phase power supply, the structure of the open-phase detection circuit of the three-phase power supply is simplified, the control logic of the motor is simpler, the use of electronic elements is reduced, and a circuit board with a small area can be selected when the motor controller is designed, thereby reducing the manufacturing cost of the motor.
2) Other advantages of the present invention are described in detail in the examples section.
Drawings
Fig. 1 is an exploded view of a motor provided in the present invention;
fig. 2 is a schematic diagram of a circuit structure of a motor provided for the present invention;
FIG. 3 is a block diagram illustrating the schematic circuit of the open-phase detection circuit for three-phase power supply according to the present invention;
fig. 4 is a schematic circuit structure diagram of a three-phase power supply open-phase detection circuit provided by the invention;
FIG. 5 is a schematic waveform diagram of a three-phase power supply U, V, W provided for the present invention without phase loss;
fig. 6 is a schematic waveform diagram of a three-phase power supply U, V, W provided for the present invention under a phase-loss condition;
FIG. 7 is a logic block diagram illustrating a power supply phase loss detection method according to the present invention;
FIG. 8 is a schematic logic block diagram illustrating a power supply open-phase detection method in the state where the voltage reduction circuit is connected to the I/O port of the MCU according to the present invention;
fig. 9 is a logic block diagram of the power supply open-phase detection method in the state that the voltage reduction circuit is connected to the a/D port of the microprocessor MCU according to the present invention.
Detailed Description
The present invention will be described in further detail below with reference to specific embodiments and with reference to the accompanying drawings.
The first embodiment is as follows:
as shown in fig. 1 and fig. 2, the embodiment provides a motor with a three-phase power supply open-phase detection function, which includes a motor unit 1 and a motor controller 2, the motor unit 1 includes a stator assembly and a rotor assembly, the rotor assembly is sleeved on the inner side or the outer side of the stator assembly, the motor controller 2 includes a control box 22 and a control circuit board 21 installed in the control box 22, a power supply circuit, a microprocessor MCU, an inverter circuit, a position detection circuit (i.e., a hall sensor) and a three-phase power supply open-phase detection circuit are integrated on the control circuit board 21, the three-phase power supply U, V, W is connected to the input end of the power supply circuit, the power supply circuit supplies power to each part of the circuits, the motor microprocessor MCU controls the inverter circuit, the inverter circuit controls the on-off of each phase coil winding of the stator assembly so as to control the start and stop of the motor unit 1, the position detection circuit (namely the Hall sensor) is used for conveying the real-time operation parameters (namely the rotor position information) of the motor monomer to the microprocessor MCU, the three-phase power supply open-phase detection circuit is used for sampling the real-time phase voltage U0 of the three-phase power supply U, V, W and conveying signals to the microprocessor MCU, and a counter is arranged inside the microprocessor MCU.
The stator assembly comprises U, V, W three-phase coil windings, alternating current INPUT (AC INPUT) passes through a rectifying circuit composed of diodes D7, D8, D9, D10, D11 and D12 and then outputs direct current bus voltage to supply power at one end of a capacitor C1, the inverter circuit comprises electronic switching tubes Q1, Q2, Q3, Q4, Q5 and Q6, diodes D1, D2, D3, D4, D5 and D6, and control ends of the electronic switching tubes Q1, Q2, Q3, Q4, Q5 and Q6 are respectively controlled by 6 paths of PWM signals (P1, P2, P3, P4, P5 and P6) output by a microprocessor. In fig. 2, the motor unit 1 is shown with the letter M around a circle.
As shown in fig. 3 and 4, the three-phase power supply open-phase detection circuit includes three rectification circuits and a voltage reduction circuit, the input ends of the three rectification circuits are respectively connected with U, V, W, the output ends of the three rectification circuits are connected together as the input end of the voltage reduction circuit, the output end of the voltage reduction circuit is connected with the input end of a microprocessor MCU as a signal output end, the microprocessor MCU compares the real-time phase voltage U0 with the set voltage U1, and records the comparison result of the sizes of U0 and U1 once every a period of time T and counts by using a counter inside the microprocessor MCU, the microprocessor MCU judges whether open-phase is present according to the count result, if so, the microprocessor MCU controls the inverter circuit to perform shutdown operation; specifically, when the microprocessor MCU continuously records that the real-time phase voltage U0 is less than the set voltage U1 for multiple times, the microprocessor MCU determines that the three-phase power supply U, V, W is in a phase-failure state, and enters a power supply phase-failure protection mode, the microprocessor MCU controls the inverter circuit to perform shutdown operation, and in the power supply phase-failure protection mode, if the microprocessor MCU continuously records that the real-time phase voltage U0 is greater than the set voltage U1 for multiple times and the number of times that U0 is greater than U1 is greater than the set number of times, the microprocessor MCU determines that the three-phase power supply U, V, W is recovered to be normal, and exits the power supply phase-failure protection mode, and the microprocessor MCU controls the motor unit to operate through the inverter circuit.
When the three-phase power U, V, W is not in phase failure, the waveform signal received by the microprocessor MCU is distributed over the set voltage U1, as shown in fig. 5.
When the three-phase input power U, V, W is in a phase-loss condition, the waveform signal received by the microprocessor MCU is distributed between the set voltages U1, as shown in fig. 6.
The voltage provided by the three-phase power supply U, V, W is rectified and reduced by the three rectifying circuits and the voltage reducing circuit, then the waveform signal is transmitted to the microprocessor MCU, the microprocessor MCU compares the real-time phase voltage U0 with the set voltage U1, and the comparison results of the U0 and the U1 are recorded once every a period of time T and counted, the microprocessor MCU judges whether the phase is lost or not according to the counting results, if the phase is lost, the microprocessor MCU controls the inverter circuit to stop the operation, the scheme directly completes the phase-loss detection of the three-phase power supply through the microprocessor MCU without arranging a comparison circuit in the phase-loss detection circuit of the three-phase power supply, thereby simplifying the structure of the open-phase detection circuit of the three-phase power supply, leading the control logic of the motor to be simpler, reducing the use of electronic elements, the circuit board with small area can be selected when the motor controller is designed, thereby reducing the manufacturing cost of the motor.
As shown in fig. 4, the open-phase detection circuit for a three-phase power supply further includes a clamping circuit, the clamping circuit is electrically connected between the voltage reduction circuit and the microprocessor MCU, and the clamping circuit is used to prevent the voltage from exceeding the maximum voltage that the microprocessor MCU can bear, so as to protect the microprocessor MCU.
As shown in fig. 4, the voltage-reducing circuit includes a plurality of resistors connected in series, the voltage-reducing circuit in this embodiment is formed by connecting 4 resistors in series, the 4 resistors are respectively a resistor R1, a resistor R2, a resistor R3, and a resistor R4, the three-way rectifying circuit is formed by diodes D13, D14, D15, D16, D17, and D18, and each rectifying circuit is formed by two diodes.
Microprocessor MCU includes IO port and AD port, and the motor that takes three phase current power open-phase detection function that this scheme of adoption provided can be received corresponding port according to user demand with three phase current power open-phase detection circuit's step-down circuit's output during the wiring, has richened the mode of connection for control circuit board 21 is humanized more and convenient when the wiring, the make full use of microprocessor MCU's of being convenient for port.
As shown in fig. 8, in this embodiment, the output end of the voltage-reducing circuit is connected to the I/O port of the microprocessor MCU; specifically, when the output end of the voltage reduction circuit is connected to the I/O port, if the real-time phase voltage U0 of the three-phase power supply U, V, W is smaller than the set voltage U1 of the I/O port, the microprocessor MCU determines that the I/O port is a low-level input, and if the real-time phase voltage U0 of the three-phase power supply U, V, W is larger than the set voltage U1 of the I/O port, the microprocessor MCU determines that the I/O port is a high-level input; the microprocessor MCU records the signal input condition of the I/O port once every a period of time T and counts, when the microprocessor MCU continuously records the low level input of the I/O port for a plurality of times, the microprocessor MCU judges that the phase is lost, enters a power supply phase loss protection mode, and controls the inverter circuit to stop operating.
Under the power supply open-phase protection mode, if the microprocessor MCU continuously records that the I/O port is high level input for many times and the number of times of the high level input of the I/O port is more than the set number of times, the microprocessor MCU judges that the three-phase power supply U, V, W is recovered to be normal and exits the power supply open-phase protection mode, and the microprocessor MCU controls the motor monomer to operate through the inverter circuit.
Example two:
as shown in fig. 9, this embodiment is another solution proposed on the basis of the first embodiment, in this embodiment, an output end of the voltage-reducing circuit is connected to an a/D port of the microprocessor MCU; specifically, when the output end of the voltage reduction circuit is connected with an A/D port of the microprocessor MCU, the microprocessor MCU records the comparison result of the real-time phase voltage U0 and the set voltage U1 of the A/D port once every a period of time T and counts, when the microprocessor MCU continuously records that U0 is less than U1 for multiple times, the microprocessor MCU judges that the phase is open, enters a power supply open-phase protection mode, and controls the inverter circuit to stop operating.
Under the power supply open-phase protection mode, if the microprocessor MCU continuously records that the real-time phase voltage U0 is greater than the set voltage U1 for multiple times and the times that U0 is greater than U1 are more than the set times, the microprocessor MCU judges that the three-phase power supply U, V, W is recovered to be normal and exits the power supply open-phase protection mode, and the microprocessor MCU controls the motor monomer to run through the inverter circuit.
Example three:
as shown in fig. 7, the present embodiment provides a power supply open-phase detection method for a motor with a three-phase power supply open-phase detection function, where the motor adopts the motor with the three-phase power supply open-phase detection function described in the first embodiment or the second embodiment, and the power supply open-phase detection method includes the following steps:
step 1: the microprocessor MCU acquires a real-time phase voltage U0 of the three-phase power supply U, V, W, compares the real-time phase voltage U0 with a set voltage U1, records the comparison result of the sizes of U0 and U1 once every a period of time T, and counts;
step 2: judging whether the real-time phase voltage U0 is continuously recorded by the microprocessor MCU for multiple times and is smaller than the set voltage U1, if so, judging that the three-phase power supply U, V, W is in a phase-lacking state by the microprocessor MCU, entering a power supply phase-lacking protection mode, controlling the inverter circuit to stop the operation by the microprocessor MCU, and if not, returning to the step 1;
and step 3: and under the power supply open-phase protection mode, judging whether the real-time phase voltage U0 is continuously recorded by the microprocessor MCU for multiple times and is greater than the set voltage U1, wherein the times that U0 is greater than U1 are more than the set times, if so, judging that the three-phase power supply U, V, W is normal by the microprocessor MCU, exiting the power supply open-phase protection mode, controlling the motor unit to operate by the microprocessor MCU through an inverter circuit, and if not, returning to the step 1.
The detection method needs to make corresponding logic control changes according to the transmission characteristics of different ports of the voltage reduction circuit, wherein the output end of the voltage reduction circuit is connected with the MCU.
As shown in fig. 8, for example: when the output end of the voltage reduction circuit is connected with an I/O port of a microprocessor MCU, the microprocessor MCU records the signal input condition of the I/O port once every a period of time T and counts, when the microprocessor MCU continuously records that the I/O port is input at a low level for many times, the microprocessor MCU judges that the I/O port is open-phase and enters a power supply open-phase protection mode, and the microprocessor MCU controls the inverter circuit to stop operating; under the power supply open-phase protection mode, if the microprocessor MCU continuously records that the I/O port is high level input for multiple times and the times of the high level input of the I/O port are more than the set times, the microprocessor MCU judges that the three-phase power supply U, V, W is recovered to be normal and exits the power supply open-phase protection mode, and the microprocessor MCU controls the motor monomer to operate through the inverter circuit.
As shown in fig. 9, for another example: when the output end of the voltage reduction circuit is connected with an A/D port of a microprocessor MCU, the microprocessor MCU records the comparison result of the real-time phase voltage U0 and the set voltage U1 of the A/D port once every a period of time T and counts, when the microprocessor MCU continuously records that U0 is more than U1 for many times, the microprocessor MCU judges that the phase is open, enters a power supply open-phase protection mode, and controls the inverter circuit to stop the operation; under the power supply open-phase protection mode, if the microprocessor MCU continuously records that the real-time phase voltage U0 is greater than the set voltage U1 for multiple times and the times that U0 is greater than U1 are more than the set times, the microprocessor MCU judges that the three-phase power supply U, V, W is recovered to be normal and exits the power supply open-phase protection mode, and the microprocessor MCU controls the motor monomer to run through the inverter circuit.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited thereto, and other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention are all equivalent substitutions and are intended to be included within the scope of the present invention.
Claims (8)
1. A motor with a three-phase power supply open-phase detection function comprises:
the motor unit comprises a stator assembly and a rotor assembly;
the motor controller comprises a power supply circuit, a microprocessor MCU, an inverter circuit and a three-phase power supply phase-failure detection circuit, wherein a three-phase power supply U, V, W is connected to the input end of the power supply circuit, the power supply circuit supplies power to each circuit, the microprocessor MCU controls a motor monomer through the inverter circuit, and the three-phase power supply phase-failure detection circuit is used for sampling a real-time phase voltage U0 of the three-phase power supply U, V, W and transmitting a signal to the microprocessor MCU;
the method is characterized in that: three-phase power supply phase failure detection circuitry includes three routes rectifier circuit and step-down circuit, three-phase power U, V, W is connected respectively to three routes rectifier circuit's input, three routes rectifier circuit's output links together as the input of step-down circuit, the output of step-down circuit connects microprocessor MCU's input as signal output part, microprocessor MCU compares real-time looks voltage U0 and the size of settlement voltage U1, and every interval time T record once U0 and U1's big or small comparison result and count, microprocessor MCU judges according to the count result whether lack of the phase, if lack of the phase, microprocessor MCU control inverter circuit carries out shutdown operation.
2. The motor with the function of detecting the open phase of the three-phase power supply according to claim 1, characterized in that: the microprocessor MCU comprises an I/O port and an A/D port, and the output end of the voltage reduction circuit is connected with the I/O port of the microprocessor MCU or the A/D port of the microprocessor MCU.
3. The motor with the function of detecting the open phase of the three-phase power supply according to claim 2, characterized in that: when the output end of the voltage reduction circuit is connected with the I/O port, if the real-time phase voltage U0 of the three-phase power supply U, V, W is smaller than the set voltage U1 of the I/O port, the microprocessor MCU judges that the I/O port is low-level input, and if the real-time phase voltage U0 of the three-phase power supply U, V, W is larger than the set voltage U1 of the I/O port, the microprocessor MCU judges that the I/O port is high-level input;
the microprocessor MCU records the signal input condition of the I/O port once every a period of time T and counts, when the microprocessor MCU continuously records the low level input of the I/O port for a plurality of times, the microprocessor MCU judges that the phase is lost, enters a power supply phase loss protection mode, and controls the inverter circuit to stop operating.
4. The motor with the function of detecting the open phase of the three-phase power supply according to claim 3, characterized in that: under the power supply open-phase protection mode, if the microprocessor MCU continuously records that the I/O port is high level input for many times and the number of times of the high level input of the I/O port is more than the set number of times, the microprocessor MCU judges that the three-phase power supply U, V, W is recovered to be normal and exits the power supply open-phase protection mode, and the microprocessor MCU controls the motor monomer to operate through the inverter circuit.
5. The motor with the function of detecting the open phase of the three-phase power supply according to claim 2, characterized in that: when the output end of the voltage reduction circuit is connected with the A/D port, the microprocessor MCU records the comparison result of the real-time phase voltage U0 and the set voltage U1 of the A/D port once every a period of time T and counts, when the microprocessor MCU continuously records that U0 is less than U1 for multiple times, the microprocessor MCU judges that the phase is open, a power supply open-phase protection mode is entered, and the microprocessor MCU controls the inverter circuit to stop operating.
6. The motor with the function of detecting the phase failure of the three-phase power supply according to claim 5, wherein: under the power supply open-phase protection mode, if the microprocessor MCU continuously records that the real-time phase voltage U0 is greater than the set voltage U1 for multiple times and the times that U0 is greater than U1 are more than the set times, the microprocessor MCU judges that the three-phase power supply U, V, W is recovered to be normal and exits the power supply open-phase protection mode, and the microprocessor MCU controls the motor monomer to run through the inverter circuit.
7. The motor with the function of detecting the phase failure of the three-phase power supply according to claim 1, characterized in that: the three-phase power supply open-phase detection circuit further comprises a clamping circuit, the clamping circuit is electrically connected between the voltage reduction circuit and the microprocessor MCU, and the voltage reduction circuit comprises a plurality of resistors connected in series.
8. A power supply phase-lack detection method of a motor with a three-phase power supply phase-lack detection function is characterized by comprising the following steps: the motor with the function of detecting the open phase of the three-phase power supply according to any one of claims 1 to 7 is adopted, and the method for detecting the open phase of the power supply comprises the following steps:
step 1: the microprocessor MCU acquires a real-time phase voltage U0 of the three-phase power supply U, V, W, compares the real-time phase voltage U0 with a set voltage U1, records the comparison result of the sizes of U0 and U1 once every a period of time T, and counts;
step 2: judging whether the real-time phase voltage U0 is continuously recorded by the microprocessor MCU for multiple times and is smaller than the set voltage U1, if so, judging that the three-phase power supply U, V, W is in a phase-lacking state by the microprocessor MCU, entering a power supply phase-lacking protection mode, controlling the inverter circuit to stop the operation by the microprocessor MCU, and if not, returning to the step 1;
and step 3: and under the power supply open-phase protection mode, judging whether the real-time phase voltage U0 is continuously recorded by the microprocessor MCU for multiple times and is greater than the set voltage U1, wherein the times that U0 is greater than U1 are more than the set times, if so, judging that the three-phase power supply U, V, W is normal by the microprocessor MCU, exiting the power supply open-phase protection mode, controlling the motor unit to operate by the microprocessor MCU through an inverter circuit, and if not, returning to the step 1.
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