CN110391641B - Motor overheat protector and motor overheat protection control method - Google Patents
Motor overheat protector and motor overheat protection control method Download PDFInfo
- Publication number
- CN110391641B CN110391641B CN201910660242.6A CN201910660242A CN110391641B CN 110391641 B CN110391641 B CN 110391641B CN 201910660242 A CN201910660242 A CN 201910660242A CN 110391641 B CN110391641 B CN 110391641B
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- circuit
- motor
- temperature
- alarm
- control circuit
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
-
- 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
- H02H7/085—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 excessive load
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- Protection Of Generators And Motors (AREA)
- Inverter Devices (AREA)
Abstract
The motor overheat protector comprises a protector main body, a control circuit and a CAN node circuit, wherein the control circuit is arranged in the protector main body, the motor is externally connected with the control circuit, the CAN node circuit is externally connected with the control circuit, and the control circuit comprises a power supply conversion circuit, a temperature acquisition and processing circuit, a temperature over-high alarm circuit and a motor work control circuit. The invention has the advantages of small volume, convenient integration and installation, automatic locking of the over-temperature circuit to prevent the repeated automatic access of the motor to the power grid after the temperature is normal, low manufacturing cost and network transmission and alarm functions.
Description
Technical Field
The invention relates to the field of motor protection control equipment, in particular to a motor overheat protector and a motor overheat protection control method.
Background
At present, the motor is widely used in the industrial field and the civil field, and the working temperature of the motor needs to be closely monitored in the working process so as to avoid faults caused by overhigh temperature. The protector is suitable for thermal protection of a single-phase motor and a three-phase motor, and can enter an automatic locking state after a protection circuit works, so that the motor can not be connected into a power grid again to work after the motor stall temperature is reduced, and the motor damage caused by repeated connection into the power grid is avoided. Meanwhile, the protector CAN be optionally provided with a CAN bus node module for remote network transmission. The protector has fewer elements, is convenient for integration and miniaturization, and has lower manufacturing cost.
Disclosure of Invention
Aiming at the description, the invention designs the motor overheat protector and the motor overheat protection control method, and the working temperature of the motor is acquired through the temperature acquisition and processing circuit. If the temperature is too high, the temperature too high alarm circuit CAN send out audible and visual alarm, the motor work control circuit CAN cut out the power grid of the motor and enter a locking state, and the CAN node circuit CAN send out a signal to the control center through the network. To achieve the purpose, the invention provides a motor overheat protector, which comprises a protector body, a control circuit and a CAN node circuit, wherein the control circuit is arranged in the protector body:
the control circuit is arranged in the protector main body, the motor is externally connected to the control circuit, the CAN node circuit is externally connected to the control circuit, the control circuit comprises a power supply conversion circuit, a temperature acquisition and processing circuit, a temperature over-high alarm circuit and a motor work control circuit, the power supply conversion circuit supplies power for all the circuits, the temperature acquisition and processing circuit is responsible for detecting a motor temperature signal and sends the temperature signal to the temperature over-high alarm circuit, the motor work control circuit and the CAN node circuit after processing, wherein the temperature over-high alarm circuit sends the signal to the LED and the loudspeaker to send an audible and visual alarm signal, the motor work control circuit directly controls the motor to work after processing the signal, and the CAN node circuit sends the signal to a bus for transmission to a remote control room.
As a further improvement of the motor overheat protector, the input end of the temperature acquisition and processing circuit is connected with the power supply conversion circuit, and the output end of the temperature acquisition and processing circuit is connected with the over-temperature alarm circuit, the motor work control circuit and the CAN node circuit, and the motor overheat protector consists of a thermistor, a resistor, an inverter, a switch tube and a Controller Area Network (CAN) node circuit.
As a further improvement of the motor overheat protector, the input end of the overheat alarm circuit is connected with the power supply conversion circuit and the temperature acquisition and processing circuit, the output end of the overheat alarm circuit is connected with the loudspeaker and the LED luminous tube, and the overheat alarm circuit consists of a switch tube, a resistor, the LED luminous tube and the loudspeaker.
As a further improvement of the motor overheat protector, the LED luminous tube and the loudspeaker are exposed out of the protector main body so as to be convenient for alarming.
As a further improvement of the motor overheat protector, the input end of the motor work control circuit is connected with the power supply conversion circuit and the temperature acquisition and processing circuit, and the output end of the motor work control circuit is directly connected with the motor and the 220V alternating current power supply, and the motor overheat protector consists of a resistor, a switching tube and a bidirectional thyristor.
As a further improvement of the motor overheat protector, the input end of the power supply conversion circuit is connected with a 220V power supply, and the output end of the power supply conversion circuit is connected with the temperature acquisition and processing circuit, the temperature over-high alarm circuit and the motor work control circuit, and the motor overheat protector consists of a diode, a diode bridge and a capacitor.
As a further improvement of the motor overheat protector, the input end of the CAN node circuit is connected with the temperature acquisition and processing circuit, and the output end of the CAN node circuit is connected with the CAN bus.
As a further improvement of the motor overheat protector, the CAN node circuit is externally connected with the outside of the protector main body and is connected with the controller circuit by the aviation plug, and the CAN node circuit CAN be selectively installed according to whether network transmission is carried out or not.
The invention provides a motor overheat protection control method of a motor overheat protector, which comprises the following specific steps:
the control circuit in the protector main body of the motor overheat protector comprises a temperature acquisition and processing circuit, a temperature over-high alarm circuit, a motor work control circuit, a power supply conversion circuit and a CAN node circuit, wherein the power supply conversion circuit provides power for the temperature acquisition and processing circuit, the temperature over-high alarm circuit and the motor work control circuit, and the temperature acquisition and processing circuit acquires the working temperature of a motor and inputs signals to the temperature over-high alarm circuit, the motor work control circuit and the CAN node circuit. The temperature-overhigh alarm circuit processes the signals and gives out audible and visual alarm, the motor work control circuit processes the signals and controls the motor to work, and the CAN node circuit processes the signals and sends the signals to the bus for network transmission;
in the working process, a thermistor in the temperature acquisition and processing circuit is responsible for acquiring a temperature signal R 1 The temperature setting resistor is used for setting alarm temperature, when the working temperature of the motor is normal, the RS trigger chip sends out low level, so that the switching tubes Q1 and Q2 are cut off, a port 2 outputs high level signals to be sent into the over-temperature alarm circuit, the motor working control circuit and the CAN node circuit, when the working temperature of the motor exceeds the alarm value, the thermistor resistance is increased, the RS trigger chip outputs high level, so that the switching tubes Q1 and Q2 are conducted, the conduction of the Q1 enables the output of the RS trigger to be locked in a high level state until manual reset, and the port 2 outputs low level signals to be sent into the over-temperature alarm circuit, the motor working control circuit and the CAN node circuit.
When the working temperature of the motor is normal, the switch tube Q5 is turned on when the port 2 sends a high-level signal, the alarm circuit does not send out audible and visual alarm, when the working temperature of the motor exceeds an alarm value, the switch tube Q5 is turned off when the port 2 sends a low-level signal, and the alarm circuit sends out audible and visual alarm to prompt field staff.
The port 2 in the motor work control circuit is connected with the temperature acquisition and processing circuit, when the port 2 is at a high level, the switching tube Q4 is conducted, a trigger signal is sent to the bidirectional thyristor, the bidirectional thyristor is conducted, otherwise, the thyristor is closed when alternating current is commutated, the motor stops running, the port 3 in the motor work control circuit is connected with the power supply conversion circuit, the switching tube Q3 is only cut off when alternating current voltage is commutated, the switching tube Q4 is ensured to be smoothly conducted when the port 2 is at a high level, and the switching tube Q3 is conducted at other moments, so that the switching tube Q4 is cut off, the power consumption and the heating value of the whole circuit are reduced, and the circuit is highly integrated;
the rectifier bridge in the power supply conversion circuit converts alternating current into pulsating direct current, and sends the pulsating direct current into the motor work control circuit so as to detect the alternating current commutation moment, and the diode and the capacitor are used for outputting relatively stable direct current to provide power for the temperature acquisition and processing circuit and the temperature overload alarm circuit.
The CAN node circuit sends an alarm signal of motor stalling to the CAN bus and transmits the alarm signal to a remote control center.
The motor overheat protector and the motor overheat protection control method are suitable for different types of motors, and only the power line of the motor is required to be connected with the protector.
Drawings
FIG. 1 is a schematic diagram of the wiring of the protection device of the present patent;
FIG. 2 is a schematic diagram of the protection temperature acquisition and processing circuit of the present patent;
FIG. 3 is a protection temperature over-temperature alarm circuit of the present patent;
FIG. 4 is a circuit for controlling the operation of the motor of the present patent;
FIG. 5 is a schematic diagram of the protection power conversion circuit of the present patent;
FIG. 6 is a CAN node circuit of the present patent;
Detailed Description
The invention is described in detail below with reference to the attached drawings and examples:
the invention designs a motor overheat protector and a motor overheat protection control method, and the working temperature of a motor is acquired through a temperature acquisition and processing circuit. If the temperature is too high, the temperature too high alarm circuit CAN send out audible and visual alarm, the motor work control circuit CAN cut out the power grid of the motor and enter a locking state, and the CAN node circuit CAN send out a signal to the control center through the network.
As a specific embodiment of the invention, as shown in FIG. 1, the control circuit in the protector body comprises a temperature acquisition and processing circuit as shown in FIG. 2, an over-temperature alarm circuit as shown in FIG. 3, a motor operation control circuit as shown in FIG. 4, a power supply conversion circuit as shown in FIG. 5, and a CAN node circuit as shown in FIG. 6. The power supply conversion circuit provides power for the temperature acquisition and processing circuit, the temperature over-high alarm circuit and the motor work control circuit. The temperature acquisition and processing circuit acquires the working temperature of the motor and inputs signals into the over-temperature alarm circuit, the motor working control circuit and the CAN node circuit. The temperature-overhigh alarm circuit processes the signals and gives out audible and visual alarm, the motor work control circuit processes the signals and controls the motor to work, and the CAN node circuit processes the signals and sends the signals to the bus for network transmission.
As shown in FIG. 2, a thermistor in the temperature acquisition and processing circuit is responsible for acquiring a temperature signal, R 1 The temperature setting resistor is used for setting alarm temperature, when the working temperature of the motor is normal, the RS trigger chip sends low level to cut off the switching tubes Q1 and Q2, and a port 2 outputs high level signals to be sent into the over-temperature alarm circuit, the motor working control circuit and the CAN node circuit. When the working temperature of the motor exceeds the alarm value, the resistance of the thermistor is increased, the RS trigger chip outputs high level, so that the switching tubes Q1 and Q2 are conducted, and the conduction of Q1 enables the RS trigger to be conductedThe output is locked in a high level state until the manual reset, and the port 2 outputs a low level signal to be sent to the over-temperature alarm circuit, the motor work control circuit and the CAN node circuit.
As shown in fig. 3, when the working temperature of the motor is normal and the port 2 sends a high-level signal, the switch tube Q5 is turned on, and the alarm circuit does not send out audible and visual alarm. When the working temperature of the motor exceeds an alarm value, the switch tube Q5 is cut off when the port 2 sends a low-level signal, and the alarm circuit sends out audible and visual alarm to prompt field staff.
As shown in fig. 4, the port 2 in the motor operation control circuit is connected with the temperature acquisition and processing circuit, when the port 2 is at a high level, the switching tube Q4 is turned on, a trigger signal is sent to the bidirectional thyristor, the bidirectional thyristor is turned on, otherwise, the thyristor is turned off when the alternating current commutates, and the motor stops running. The port 3 in the motor work control circuit is connected with the power supply conversion circuit, so that the switching tube Q3 is cut off only when alternating voltage is converted, the switching tube Q4 is smoothly conducted when the port 2 is in a high level, and the switching tube Q3 is conducted at other moments, so that the switching tube Q4 is cut off, the power consumption and the heating value of the whole circuit are reduced, and the circuit can be highly integrated.
As shown in fig. 5, the rectifier bridge in the power conversion circuit converts the ac power into pulsating dc power, and sends the pulsating dc power to the motor operation control circuit so as to detect the ac commutation moment. The diode and the capacitor output more stable direct current to provide power for the temperature acquisition and processing circuit and the temperature over-high alarm circuit.
As shown in fig. 6, the CAN node circuit sends an alarm signal of motor stall to the CAN bus for transmission to the remote control center.
The above description is only of the preferred embodiment of the present invention, and is not intended to limit the present invention in any other way, but is intended to cover any modifications or equivalent variations according to the technical spirit of the present invention, which fall within the scope of the present invention as defined by the appended claims.
Claims (1)
1. The motor overheat protection control method of the motor overheat protector comprises a protector main body, a control circuit and a CAN node circuit, wherein the control circuit is arranged in the protector main body, the motor is externally connected with the control circuit, the CAN node circuit is externally connected with the control circuit, the control circuit comprises a power supply conversion circuit, a temperature acquisition and processing circuit, a temperature over-high alarm circuit and a motor work control circuit, the power supply conversion circuit supplies power for all the circuits, the temperature acquisition and processing circuit is responsible for detecting a motor temperature signal, and sends the temperature signal to the temperature over-high alarm circuit, the motor work control circuit and the CAN node circuit after being processed, the temperature over-high alarm circuit sends the signal to an LED and a loudspeaker to send an audible and visual alarm signal, the motor work control circuit directly controls the motor work after being processed, and the CAN node circuit sends the signal to a bus for transmission to a remote control room;
the input end of the temperature acquisition and processing circuit is connected with the power supply conversion circuit, the output end port 2 is connected with the over-temperature alarm circuit, the motor work control circuit and the CAN node circuit, and the temperature acquisition and processing circuit comprises a thermistor and a temperature setting resistor R 1 An inverter, a switching tube Q1, a switching tube Q2, an RS trigger and a resistor R 2 Resistance R 3 Composition;
thermistor input end and circuit port 1, resistor R 3 The output end is connected with a temperature setting resistor R 1 An inverter input terminal, an RS trigger input port 1, a resistor R 2 Connected with a temperature setting resistor R 1 One end is connected with the output end of the thermistor, the other end is connected with the emitters of the switching tubes Q1 and Q2, and the switching tube Q 1 Collector and resistor R of (2) 2 The series connection is connected with the output end of the thermistor, the base electrode is connected with the output end of the RS trigger and the base electrode of the switching tube Q2, the input end of the inverter is connected with the output end of the thermistor, the output end of the inverter is connected with the input port 2 of the RS trigger, the input port 1 of the RS trigger is connected with the output end of the thermistor, the input port 2 of the RS trigger is connected with the output end of the inverter, the output end of the RS trigger is connected with the base electrodes of the switching tubes Q1 and Q2, and the resistor R 3 One end is connected with the input end of the thermistor, the other end is connected with the collector of the switching tube Q2, and the collector of the switching tube Q2 and the resistor R 3 The base electrode is connected with the base electrode of the switch tube Q1, and the emitter electrode is connected with the switch tube Q1The emitter is connected;
the temperature acquisition and processing circuit detects that the motor is powered off after the motor temperature is too high, and meanwhile the circuit enters a locking state to prevent the motor from being automatically connected to a power grid when the motor temperature is normal, and the circuit can release the locking state only by manual reset;
the input end of the temperature-overload alarm circuit is connected with the power supply conversion circuit and the temperature acquisition and processing circuit, the output end of the temperature-overload alarm circuit is connected with the loudspeaker and the LED, and the temperature-overload alarm circuit consists of a switch tube Q5, a resistor, the LED and the loudspeaker;
the LED luminous tube and the loudspeaker are exposed out of the protector main body;
the input end port 3 of the motor work control circuit is connected with a power supply conversion circuit, the input end port 2 of the motor work control circuit is connected with a temperature acquisition and processing circuit, the output end is directly connected with a motor and a 220V alternating current power supply,
the power conversion circuit comprises a resistor, a switching tube Q3, a switching tube Q4, a bidirectional thyristor and a resistor R 4 Resistance R 5 Resistance R 6 Resistance R 7 Composition, resistance R 4 One end is connected with the circuit input port 3, and the other end is connected with the resistor R 5 And the base electrode of the switch tube Q3 is connected with the resistor R 5 One end is connected with the base electrode of the switch tube Q3, the other end is connected with the emitter electrodes of the switch tubes Q3 and Q4, and the resistor R 6 One end of the switch tube Q3 is connected with the resistor R and the other end is connected with the collector of the switch tube 2, the base of the switch tube Q3 is connected with the resistor R 4 、R 5 Is connected with the common end of the switch tube Q4, the emitter is connected with the resistor R 5 Connected with the collector and the resistor R 6 And the base electrode of the switching tube Q4 is connected, the base electrode of the switching tube Q4 is connected with the collector electrode of the switching tube Q3, the emitter electrode is connected with the emitter electrode of the switching tube Q3, and the collector electrode is connected with the resistor R 7 Connected with resistor R 7 One end of the bidirectional thyristor is directly connected with a 220V power supply, and the other end of the bidirectional thyristor is directly connected with a motor;
the input end of the power supply conversion circuit is connected with a 220-volt power supply, and the output end of the power supply conversion circuit is connected with a temperature acquisition and processing circuit, a temperature over-high alarm circuit and a motor work control circuit, and the power supply conversion circuit consists of a diode, a diode bridge and a capacitor;
the input end of the CAN node circuit is connected with the temperature acquisition and processing circuit, and the output end of the CAN node circuit is connected with the CAN bus;
the CAN node circuit is externally connected to the outside of the protector main body, is connected with the controller circuit by an aviation plug and is selectively installed according to whether network transmission is carried out or not;
the method comprises the following specific steps of:
the control circuit in the protector main body of the motor overheat protector comprises a temperature acquisition and processing circuit, a temperature over-high alarm circuit, a motor work control circuit, a power supply conversion circuit and a CAN node circuit, wherein the power supply conversion circuit provides power for the temperature acquisition and processing circuit, the temperature over-high alarm circuit and the motor work control circuit, the temperature acquisition and processing circuit acquires the working temperature of a motor and inputs signals into the temperature over-high alarm circuit, the motor work control circuit and the CAN node circuit, the temperature over-high alarm circuit processes the signals and then gives out audible and visual alarms, the motor work control circuit processes the signals and then controls the motor to work, and the CAN node circuit sends the processed signals to a bus for network transmission;
in the working process, a thermistor in the temperature acquisition and processing circuit is responsible for acquiring a temperature signal R 1 The temperature setting resistor is used for setting alarm temperature, when the working temperature of the motor is normal, the RS trigger chip sends low level to enable the switching tubes Q1 and Q2 to be cut off, a port 2 outputs high level signals to be sent into the over-temperature alarm circuit, the motor working control circuit and the CAN node circuit, when the working temperature of the motor exceeds the alarm value, the thermistor resistance is increased, the RS trigger chip outputs high level to enable the switching tubes Q1 and Q2 to be conducted, the conduction of the Q1 enables the output of the RS trigger to be locked in a high level state until manual reset is achieved, and the port 2 outputs low level signals to be sent into the over-temperature alarm circuit, the motor working control circuit and the CAN node circuit;
when the working temperature of the motor is normal, the port 2 sends a high-level signal, the switching tube Q5 is switched on, the alarm circuit does not send out audible and visual alarm, when the working temperature of the motor exceeds an alarm value, the port 2 sends a low-level signal, the switching tube Q5 is switched off, and the alarm circuit sends out audible and visual alarm to prompt field staff;
the port 2 in the motor work control circuit is connected with the temperature acquisition and processing circuit, when the port 2 is at a high level, the switching tube Q4 is conducted, a trigger signal is sent to the bidirectional thyristor, the bidirectional thyristor is conducted, otherwise, the thyristor is closed when alternating current is commutated, the motor stops running, the port 3 in the motor work control circuit is connected with the power supply conversion circuit, the switching tube Q3 is only cut off when alternating current voltage is commutated, the switching tube Q4 is ensured to be smoothly conducted when the port 2 is at a high level, and the switching tube Q3 is conducted at other moments, so that the switching tube Q4 is cut off, the power consumption and the heating value of the whole circuit are reduced, and the circuit is highly integrated;
the rectifier bridge in the power supply conversion circuit converts alternating current into pulsating direct current, and sends the pulsating direct current into the motor working control circuit so as to detect the alternating current commutation moment, and outputs relatively stable direct current to provide power for the temperature acquisition and processing circuit and the temperature overload alarm circuit after passing through the diode and the capacitor;
the CAN node circuit sends an alarm signal of motor stalling to the CAN bus and transmits the alarm signal to a remote control center.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910660242.6A CN110391641B (en) | 2019-07-22 | 2019-07-22 | Motor overheat protector and motor overheat protection control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910660242.6A CN110391641B (en) | 2019-07-22 | 2019-07-22 | Motor overheat protector and motor overheat protection control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110391641A CN110391641A (en) | 2019-10-29 |
| CN110391641B true CN110391641B (en) | 2024-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910660242.6A Active CN110391641B (en) | 2019-07-22 | 2019-07-22 | Motor overheat protector and motor overheat protection control method |
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| Publication number | Publication date |
|---|---|
| CN110391641A (en) | 2019-10-29 |
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