CN117978044A - Non-operation detection circuit of brushless direct current motor - Google Patents
Non-operation detection circuit of brushless direct current motor Download PDFInfo
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- CN117978044A CN117978044A CN202410068870.6A CN202410068870A CN117978044A CN 117978044 A CN117978044 A CN 117978044A CN 202410068870 A CN202410068870 A CN 202410068870A CN 117978044 A CN117978044 A CN 117978044A
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Abstract
The invention provides a brushless direct current motor non-operation detection circuit, which comprises a Hall signal level change identification circuit, a non-working threshold judgment circuit and a power-on reset processing and non-working state output circuit which are connected in sequence; the Hall signal level change identification circuit is connected with a motor Hall sensor, and the power-on reset processing and non-working state output circuit is connected with a system fault detection port; the invention feeds back the running position of the motor by detecting the Hall signal of the position sensor of the motor, outputs a high-low level change signal with the frequency increased along with the rising of the rotating speed of the motor when the motor works normally, feeds back the position of the motor when the motor fails and does not work, reports the non-working state of the motor to a system, ensures that the brushless direct current motor runs safely and can be found out to be maintained in time when the motor fails, does not enlarge the failure and does not influence the safe running of other equipment; the circuit structure is simple, motor fault detection can be realized through a hardware circuit, and the cost is low.
Description
Technical Field
The invention belongs to the technical field of control of brushless direct current motors, and particularly relates to a non-operation detection circuit of a brushless direct current motor.
Background
The brushless direct current motor integrates the advantages of the direct current motor and the alternating current motor, has the advantages of good adjustment performance of the direct current motor, simple structure, no reversing spark, reliable operation, easy maintenance and the like, is widely applied to various fields, and the brushless direct current motor generally uses a position sensor of a Hall sensor to detect the position of a rotor and converts the position sensor into an electric signal. The brushless direct current motor operates according to a specified rotating speed after the brushless direct current motor is powered on by driving a load, and if the motor fails, such as a control circuit failure, winding disconnection and phase failure, motor overtemperature and the like, the brushless direct current motor does not work after the motor is powered on, so that the brushless direct current motor is ensured to safely operate and can be timely found to be maintained when the motor fails, the failure is not expanded, the safe operation of other equipment is not influenced, and the non-operation detection of the brushless direct current motor is required.
In order to understand fault recognition and detection after the brushless direct current motor is powered on, china patent publication No. CN102290790B discloses a fault detection and protection circuit of the brushless direct current motor, which comprises a three-phase current signal detection module, a stator winding open-phase fault switching module, a Hall sensor signal detection module, a stator winding overcurrent detection module, a CPLD fault processing module and a winding current cutting-off module; although the circuit can detect three-phase current signals and Hall sensor signals, the CPLD FAULT processing module can carry out logic processing on the three-phase signals, hall shaping signals and overcurrent FAULT signals, the second module in fig. 10 illustrates the flow of the CPLD for realizing the phase-failure protection of the Hall sensor, the CPLD firstly carries out initialization work such as configuration of registers and ports, and then detects input Hall sensor signals HA, HB and HC to judge whether 000 or 111 states exist, if the two states exist, the Hall sensor is indicated to have phase-failure FAULTs, a Hall sensor FAULT identifier Hall_FAULT is set to 0, and after the FAULT identifier CUR_FAULT is subjected to AND operation, the FAULT protection signal FAULT outputs a low level, and the power supply of the three-phase bridge circuit is cut off through the winding current cutting-off module to realize the phase-failure protection of the Hall sensor. However, this judgment has a certain disadvantage that if the motor is not operated after being powered on, the motor hall will be one of the 6 states of normal 001, 010, 011, 100, 101, 110, whereas the CPLD only judges the two states of 000 and 111, and does not judge the direct representation that if the motor is not operated when the 6 commutation states are not continuously changed, as in the case of normal 001, 010, 011, 100, 101, 110. The motor can not be identified in the non-working state, the non-working condition of the motor is not reported to the system, the motor is a motor for providing power for the cooling fan in the system, if the non-working fault of the motor is not identified in the beginning stage, the temperature of equipment is increased during the working of the system, no cooling measures are provided, the equipment is overheated and stopped, and the completion of the tasks of the whole system is affected.
Disclosure of Invention
In order to solve the technical problems, the invention provides a brushless direct current motor non-operation detection circuit.
The invention is realized by the following technical scheme.
A brushless DC motor non-operation detection circuit comprises a Hall signal level change identification circuit, a non-working threshold judgment circuit and a power-on reset processing and non-working state output circuit which are connected in sequence; the Hall signal level change identification circuit is connected with the motor Hall sensor, and the power-on reset processing and non-working state output circuit is connected with the system fault detection port.
The Hall signal level change identification circuit comprises a monostable trigger U7; the 1 st pin of the monostable trigger U7 is connected with one end of a capacitor C1, the 2 nd pin is connected with the other end of the capacitor C1 and one end of a resistor R36, the 3 rd pin is connected with one end of a capacitor C3, the 5 th pin is connected with one end of the capacitor C2 and one end of a resistor R37, the 3 rd pin and the 16 th pin are connected with a power supply Vin, and the 4 th pin, the 8 th pin, the 11 th pin, the 12 th pin and the 13 th pin are grounded; the other end of the resistor R37 is connected with one end of the resistor R1 and the 2 nd pin of the motor Hall sensor U5; the other end of the resistor R1, the 3 rd pin of the motor Hall sensor U5 and the other end of the resistor R36 are all connected with the power supply Vin, and the 1 st pin of the motor Hall sensor U5, the other end of the capacitor C2 and the other end of the capacitor C3 are all grounded.
The non-working threshold judging circuit comprises an operational amplifier U3A; the non-inverting input end of the operational amplifier U3A is connected between the resistor R40 and the resistor R41, and the inverting input end is connected with one end of the resistor R38 and one end of the capacitor C21; the other end of the resistor R38 and one end of the resistor R39 are connected with the 6 th pin of the monostable trigger U7; the other end of the resistor R40 and the 8 th pin of the operational amplifier U3A are connected with a power supply Vin, the other end of the resistor R39 is connected with the other end of the capacitor C21 and then grounded, and the other end of the resistor R41 and the 4 th pin of the operational amplifier U3A are grounded.
The power-on reset processing and non-working state output circuit comprises an operational amplifier U3B; the non-inverting input end of the operational amplifier U3B is connected with one end of a resistor R42, a capacitor C22 and a resistor R43, the inverting input end of the operational amplifier U3B is connected between the resistor R44 and the resistor R45, and the output end of the operational amplifier U3B is connected with the anode of a diode D; the other end of the resistor R44 is connected with the power supply Vin, the other end of the resistor R42 is connected with the output end of the operational amplifier U3A, the other end of the capacitor C22 is connected with the other end of the resistor R43 and grounded, the other end of the resistor R45 is grounded, and the cathode of the diode D is connected with the system fault detection port.
The model of the monostable trigger U7 is CC4098.
The operational amplifier U3A is a low-power-consumption double operational amplifier.
The operational amplifier U3B is a low-power-consumption double operational amplifier.
The diode D is a high-speed switching diode.
The voltage value of Vin is 12V.
The invention has the beneficial effects that:
Through detecting brushless DC motor's position sensor's hall signal, motor normal operating then hall signal feedback motor running position, output the high low level change signal that increases with motor rotational speed rise frequency, motor is inoperative, if control circuit trouble, winding broken wire open-phase, super Wen Tingji etc. then hall signal feedback motor position, output constant high or constant low level signal, this level signal appears in reporting system, in time discover the trouble and maintain, do not enlarge the trouble, do not influence other equipment safe operation.
Drawings
FIG. 1 is a schematic diagram of a brushless DC motor non-operation detection circuit structure according to the present invention;
FIG. 2 is a schematic diagram of a Hall signal level change identification circuit according to the present invention;
FIG. 3 is a non-operational threshold determination circuit according to the present invention;
FIG. 4 is a power-on reset process and inactive state output circuit of the present invention.
Detailed Description
The technical solution of the present invention is further described below with reference to the drawings and examples, but the scope of the claimed invention is not limited to the above.
FIG. 1 is a schematic diagram showing the structure of a non-operation detection circuit of the brushless DC motor of the present invention; a brushless DC motor non-operation detection circuit comprises a Hall signal level change identification circuit, a non-working threshold judgment circuit and a power-on reset processing and non-working state output circuit which are connected in sequence; the Hall signal level change identification circuit is connected with the motor Hall sensor, and the power-on reset processing and non-working state output circuit is connected with the system fault detection port.
The voltage value of the power supply Vin of each internal component in the brushless direct current motor non-operation detection circuit is 12V.
As shown in fig. 2, a schematic diagram of a hall signal level change-identifying circuit is shown, wherein the hall signal level change-identifying circuit comprises a monostable trigger U7; the 1 st pin of the monostable trigger U7 is connected with one end of a capacitor C1, the 2 nd pin is connected with the other end of the capacitor C1 and one end of a resistor R36, the 3 rd pin is connected with one end of a capacitor C3, the 5 th pin is connected with one end of the capacitor C2 and one end of a resistor R37, the 3 rd pin and the 16 th pin are connected with a power supply Vin, and the 4 th pin, the 8 th pin, the 11 th pin, the 12 th pin and the 13 th pin are grounded; the other end of the resistor R37 is connected with one end of the resistor R1 and the 2 nd pin of the motor Hall sensor U5; the other end of the resistor R1, the 3 rd pin of the motor Hall sensor U5 and the other end of the resistor R36 are connected with a power supply Vin, and the 1 st pin of the motor Hall sensor U5, the other end of the capacitor C2 and the other end of the capacitor C3 are grounded;
the resistance values of the resistor R1, the resistor R37 and the resistor 36 are respectively as follows: 3300Ω,200Ω,1000000Ω;
The capacitance values of the capacitor C1, the capacitor C2 and the capacitor C3 are respectively as follows: 0.1. Mu.F, 0.001. Mu.F, 0.1. Mu.F;
the model of the monostable trigger U7 is CC4098;
The working principle and the technical effect of the Hall signal level change identification circuit are as follows: the motor Hall sensor U5 tracks the magnetic pole change of the motor rotor and outputs square wave signals with the frequency rising along with the rising of the motor rotating speed. The Hall signal level change identification circuit is mainly realized through a monostable trigger U7, a square wave signal output by a motor Hall sensor U5 is connected with a 5 th pin of the monostable trigger U7 through a resistor R37, a resistor R36 and a capacitor C1 are externally connected between a 1 st pin and a 2 nd pin of the monostable trigger U7, the width design of an output signal is realized, and the U7 is designed to be in a falling edge triggering mode, so that after the falling edge of the square wave signal output by the motor Hall sensor U5 triggers the monostable trigger U7, a power supply Vin charges a capacitor C1 through the resistor R36, then the capacitor C1 discharges through an internal passage of the monostable trigger U7, and when the voltage on the capacitor C1 reaches a gate switching voltage, the gate switching voltage refers to a switching voltage value of charging and discharging of a capacitor C1, and a 6 th pin of an output end of the monostable trigger U7 outputs a rectangular pulse signal with a constant width. The resistor R36 and the capacitor C1 are external timing elements, and determine the output pulse width of the 6 th pin, that is, the 6 th pin of the monostable trigger U7 outputs a PWM duty pulse signal that increases with the increase of the frequency of the hall signal.
FIG. 3 shows an inactivity threshold determination circuit of the present invention; the non-working threshold judging circuit comprises an operational amplifier U3A; the non-inverting input end of the operational amplifier U3A is connected between the resistor R40 and the resistor R41, and the inverting input end is connected with one end of the resistor R38 and one end of the capacitor C21; the other end of the resistor R38 and one end of the resistor R39 are connected with the 6 th pin of the monostable trigger U7; the other end of the resistor R40 and the 8 th pin of the operational amplifier U3A are connected with a power supply Vin, the other end of the resistor R39 is connected with the other end of the capacitor C21 and then grounded, and the other end of the resistor R41 and the 4 th pin of the operational amplifier U3A are grounded.
The resistance values of the resistor R38, the resistor R39, the resistor R40 and the resistor R41 are respectively as follows:
200KΩ、300KΩ、3600Ω、3600Ω；
The capacitance value of the capacitor C21 is 0.1 mu F;
the operational amplifier U3A is a low-power-consumption double operational amplifier.
The working principle and the technical effect of the non-working threshold judging circuit are as follows:
1. The PWM duty cycle pulse signal output by the 6 th pin of the monostable trigger U7 of the Hall signal level change identification circuit becomes a voltage signal after the filtering processing of the resistor R38 and the capacitor C21, and the voltage amplitude after the filtering of the resistor R38 and the capacitor C21 rises along with the increase of the duty cycle of the PWM duty cycle pulse signal. The resistor R40 and the resistor R41 form a voltage dividing circuit and are connected to the pin 3 of the homodromous input port of the U3A circuit, the resistor R40 is increased or the resistor R41 is reduced, different non-working threshold reference voltages can be set, and then the non-working threshold reference voltages are adjusted;
2. when the motor does not work, the inverting input end of the operational amplifier U3A is at a low level, namely the voltage value of the inverting input end is 0V, the voltage division value of the non-inverting input end of the operational amplifier U3A is 6V, and at the moment, the output end of the operational amplifier U3A is at a high level, namely the voltage value of the output end is 12V;
3. When the motor works, the inverting input end of the operational amplifier U3A is at a high level, namely the voltage value of the inverting input end is 12V, the voltage division value of the non-inverting input end of the operational amplifier U3A is 6V, and at the moment, the output end of the operational amplifier U3A is at a low level, namely the voltage value of the output end is 0V.
FIG. 4 shows a power-on reset process and an inactive state output circuit of the present invention; the power-on reset processing and non-working state output circuit comprises an operational amplifier U3B; the non-inverting input end of the operational amplifier U3B is connected with one end of a resistor R42, a capacitor C22 and a resistor R43, the inverting input end of the operational amplifier U3B is connected between the resistor R44 and the resistor R45, and the output end of the operational amplifier U3B is connected with the anode of a diode D; the other end of the resistor R44 is connected with the power supply Vin, the other end of the resistor R42 is connected with the output end of the operational amplifier U3A, the other end of the capacitor C22 is connected with the other end of the resistor R43 and grounded, the other end of the resistor R45 is grounded, and the cathode of the diode D is connected with the system fault detection port;
The resistance values of the resistor R42, the resistor R43, the resistor R44 and the resistor 45 are respectively: :500000Ω, 3600Ω, 1000Ω;
The capacitance value of the capacitor C22 is: 1 μF;
the operational amplifier U3B is a low-power-consumption double operational amplifier.
The diode D is a high-speed switching diode.
The working principle and the technical effect of the power-on reset processing and non-working state output circuit are as follows:
1. When the motor fails and does not work, the output end of the operational amplifier U3A is at a high level, the non-inverting input end of the operational amplifier U3B connected with the motor is at a high level, namely the voltage value of the non-inverting input end is 12V, the voltage dividing circuit consisting of the resistor R44 and the resistor R45 can obtain that the reference voltage of the inverting input end of the operational amplifier U3B in the motor non-working state is 2.6V, and the output end of the operational amplifier U3B outputs the non-working failure high level at the moment, namely the output voltage value of the output end is 12V;
2. When the motor works, the output end of the operational amplifier U3A is at a low level, namely the voltage value of the output end is 0V, the non-inverting input end of the operational amplifier U3B connected with the motor is at a low level, namely the voltage value of the non-inverting input end is 0V, the reference voltage of the inverting input end of the operational amplifier U3B in the motor non-working state is 2.6V, and at the moment, the output end of the operational amplifier U3B outputs a working low level, namely the output voltage value of the output end is 0V;
3. the resistor R42 and the capacitor C22 form a charging loop, the 6 th pin outputs a high-level pulse when the monostable trigger U7 is powered on and reset, namely, the output end of the operational amplifier U3A outputs a high-level pulse at the moment, the high-level pulse charges the capacitor C22 through the resistor R42, the charging circuit formed by the resistor R42 and the capacitor C22 controls the voltage of the non-inverting input end of the operational amplifier U3B to be 1.2V and smaller than the reference voltage of the inverting input end of the operational amplifier U3B, the reference voltage of the inverting input end of the operational amplifier U3B is 2.6V when the motor does not work, the output end of the operational amplifier U3B is at a low level at the moment, and the error warning of a non-working fault high level is output by the 7 pin of the operational amplifier U3B when the monostable trigger U7 is powered on and reset is shielded.
The non-operation detection circuit of the brushless direct current motor is applied to a certain type of brushless direct current motor, when the motor fails and does not work, such as control circuit failure, winding disconnection and phase failure, super Wen Tingji and the like, the non-operation state of the motor is reported to a failure detection system, so that the brushless direct current motor can safely operate, and can be timely found and maintained when the motor fails, the failure is not expanded, and the safe operation of other equipment is not influenced.
The above examples are only for clearly illustrating the application of the present invention, but not for limiting the embodiments of the present invention, and it is obvious to those skilled in the art that various other changes may be made based on the above description, and the present examples cannot be used for all embodiments, so the scope of protection is not limited to the examples.
Claims (9)
1. A brushless DC motor non-operation detection circuit is characterized in that: the device comprises a Hall signal level change identification circuit, an inactive threshold judgment circuit and a power-on reset processing and inactive state output circuit which are connected in sequence; the Hall signal level change identification circuit is connected with the motor Hall sensor, and the power-on reset processing and non-working state output circuit is connected with the system fault detection port.
2. A brushless dc motor non-operation detection circuit as claimed in claim 1, wherein: the Hall signal level change identification circuit comprises a monostable trigger U7; the 1 st pin of the monostable trigger U7 is connected with one end of a capacitor C1, the 2 nd pin is connected with the other end of the capacitor C1 and one end of a resistor R36, the 3 rd pin is connected with one end of a capacitor C3, the 5 th pin is connected with one end of the capacitor C2 and one end of a resistor R37, the 3 rd pin and the 16 th pin are connected with a power supply Vin, and the 4 th pin, the 8 th pin, the 11 th pin, the 12 th pin and the 13 th pin are grounded; the other end of the resistor R37 is connected with one end of the resistor R1 and the 2 nd pin of the motor Hall sensor U5; the other end of the resistor R1, the 3 rd pin of the motor Hall sensor U5 and the other end of the resistor R36 are all connected with the power supply Vin, and the 1 st pin of the motor Hall sensor U5, the other end of the capacitor C2 and the other end of the capacitor C3 are all grounded.
3. A brushless dc motor non-operation detection circuit as claimed in claim 1, wherein: the non-working threshold judging circuit comprises an operational amplifier U3A; the non-inverting input end of the operational amplifier U3A is connected between the resistor R40 and the resistor R41, and the inverting input end is connected with one end of the resistor R38 and one end of the capacitor C21; the other end of the resistor R38 and one end of the resistor R39 are connected with the 6 th pin of the monostable trigger U7; the other end of the resistor R40 and the 8 th pin of the operational amplifier U3A are connected with a power supply Vin, the other end of the resistor R39 is connected with the other end of the capacitor C21 and then grounded, and the other end of the resistor R41 and the 4 th pin of the operational amplifier U3A are grounded.
4. A brushless dc motor non-operation detection circuit as claimed in claim 1, wherein: the power-on reset processing and non-working state output circuit comprises an operational amplifier U3B; the non-inverting input end of the operational amplifier U3B is connected with one end of a resistor R42, a capacitor C22 and a resistor R43, the inverting input end of the operational amplifier U3B is connected between the resistor R44 and the resistor R45, and the output end of the operational amplifier U3B is connected with the anode of a diode D; the other end of the resistor R44 is connected with the power supply Vin, the other end of the resistor R42 is connected with the output end of the operational amplifier U3A, the other end of the capacitor C22 is connected with the other end of the resistor R43 and grounded, the other end of the resistor R45 is grounded, and the cathode of the diode D is connected with the system fault detection port.
5. A brushless dc motor non-operation detection circuit as claimed in claim 2, wherein: the model of the monostable trigger U7 is CC4098.
6. A brushless dc motor non-operation detection circuit as claimed in claim 3, wherein: the operational amplifier U3A is a low-power-consumption double operational amplifier.
7. A brushless dc motor non-operation detection circuit as defined in claim 4, wherein: the operational amplifier U3B is a low-power-consumption double operational amplifier.
8. A brushless dc motor non-operation detection circuit as defined in claim 4, wherein: the diode D is a high-speed switching diode.
9. A brushless dc motor non-operation detection circuit as claimed in any one of claims 2, 3 and 4, wherein: the voltage value of Vin is 12V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410068870.6A CN117978044A (en) | 2024-01-17 | 2024-01-17 | Non-operation detection circuit of brushless direct current motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410068870.6A CN117978044A (en) | 2024-01-17 | 2024-01-17 | Non-operation detection circuit of brushless direct current motor |
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| Publication Number | Publication Date |
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| CN117978044A true CN117978044A (en) | 2024-05-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410068870.6A Pending CN117978044A (en) | 2024-01-17 | 2024-01-17 | Non-operation detection circuit of brushless direct current motor |
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| CN (1) | CN117978044A (en) |
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- 2024-01-17 CN CN202410068870.6A patent/CN117978044A/en active Pending
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