CN206432922U - The automatic stepless speed-regulating circuit of refrigerant recovering brushless DC motor - Google Patents
The automatic stepless speed-regulating circuit of refrigerant recovering brushless DC motor Download PDFInfo
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- CN206432922U CN206432922U CN201720093761.5U CN201720093761U CN206432922U CN 206432922 U CN206432922 U CN 206432922U CN 201720093761 U CN201720093761 U CN 201720093761U CN 206432922 U CN206432922 U CN 206432922U
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Abstract
The utility model discloses a kind of automatic stepless speed-regulating circuit of refrigerant recovering brushless DC motor, it includes MCU circuits, IPM power driving circuits, temperature sensor, low-pass filter circuit and voltage comparator circuit；MCU circuits connect the UVW phase lines of the DC brushless motor of coolant reclaiming machine by IPM power driving circuits, and temperature sensor is electrically connected with the input of low-pass filter circuit；The output end of low-pass filter circuit connects MCU circuits by voltage comparator circuit.Temperature sensor detects motor lines bag temperature, voltage comparator circuit is input to after being filtered by low-pass filter circuit, temperature voltage signal is compared and outputs signal to MCU circuits by voltage comparator circuit with standard signal.If line bag temperature is too high, MCU circuits make decelerating through motor, derating power running by IPM power driving circuits, so that overheat burning fault will not occur for motor.This programme is applied to the coolant reclaiming machine using DC brushless motor.
Description
Technical field
The utility model is related to coolant reclaiming machine control field, more particularly, to a kind of coolant reclaiming machine brush DC electricity
The automatic stepless speed-regulating circuit of machine.
Background technology
Coolant reclaiming machine is a kind of equipment for reclaiming refrigerant, for reclaiming refrigerating machine（Civilian, business air conditioner, refrigerator,
The refrigeration machines such as source pump, screw rod centrifugal chiller）In refrigerant.Carry out certain processing while recovery to refrigerant again,
Such as drying, the filtering of impurity, oil, in order to the secondary utilization of refrigerant, are widely used in family expenses, Centralized Air-conditioning in Public Buildings, system
Cold manufacturer and after-sale service.
The power of existing coolant reclaiming machine mostly uses induction machine or brushed DC motor, can not all be changed according to load
To realize automatic stepless speed-regulating.
The content of the invention
The utility model be mainly solve prior art present in coolant reclaiming machine lack support speed governing circuit, can not
Technical problem according to adjustment of load power is supported to be used according to the coolant reclaiming machine of load adjust automatically power of motor there is provided a kind of
The automatic stepless speed-regulating circuit of DC brushless motor.
The utility model is mainly what is be addressed by following technical proposals for above-mentioned technical problem：A kind of refrigerant is returned
Receive brushless DC motor automatic stepless speed-regulating circuit, including MCU circuits, IPM power driving circuits, temperature sensor,
Low-pass filter circuit and voltage comparator circuit；The MCU circuits connect the direct current of coolant reclaiming machine by IPM power driving circuits
The UVW phase lines of brushless electric machine, temperature sensor is electrically connected with the input of low-pass filter circuit, and temperature sensor is arranged on direct current
In the line bag temperature detecting point of brushless electric machine；The output end of low-pass filter circuit connects the input of voltage comparator circuit, voltage
The output end connection MCU circuits of comparison circuit；MCU circuits are also electrically connected with the Hall sensor of DC brushless motor.
Temperature sensor detects motor lines bag temperature, and voltage comparator circuit is input to after being filtered by low-pass filter circuit,
Voltage comparator circuit is compared the temperature voltage signal collected with standard signal.If line bag temperature is too high, voltage ratio compared with
Circuit output signal gives MCU circuits, and MCU circuits make decelerating through motor, derating power running by IPM power driving circuits, so that
Overheat burning fault will not also occur under heavy-duty service for motor.
Preferably, the low-pass filter circuit includes resistance R39, electric capacity C32 and electric capacity C31, the electric capacity C32 is just
Pole and negative pole connect the two ends of temperature sensor, and electric capacity C32 negative pole is also grounded, and electric capacity C31 and electric capacity C32 are in parallel, resistance R39
First end connection power supply VCC5V, resistance R39 the second end connection electric capacity C32 positive pole, electric capacity C32 positive pole connection voltage
Comparison circuit.
Low-pass filter circuit is filtered out because of the measurement error and motor lines bag High-frequency Interference that lead is brought.
Preferably, the voltage comparator circuit includes comparator U12, resistance R41 and electric capacity C35；The comparator U12
In-phase input end connection normal voltage, inverting input connection electric capacity C32 positive pole, output end connection MCU circuits；Resistance
R41 first end connection power supply VCC5V, resistance R41 the second end connection comparator U12 output end；Electric capacity C35 first end
Connect comparator U12 output end, electric capacity C35 the second end ground connection.
Voltage comparator is compared temperature voltage signal with normal voltage, and comparative result is sent into MCU circuits.
Preferably, the MCU circuits include MCU chip, MCU chip is STM8S903K3；The 13 pin connection of MCU chip
Comparator U12 output end；The 6 pin connection power supply VCC5V of MCU chip；Electric capacity C39 first end connects 6 pin of MCU chip,
Second end is grounded；Electric capacity C40 and electric capacity C39 is in parallel；5 pin of MCU chip are grounded by electric capacity C46, and 1 pin is connect by electric capacity C47
Ground, 4 pin are directly grounded；19 pin, 20 pin, 18 pin, 24 pin, 17 pin and the 23 pin connection IPM power driving circuits of MCU chip.
MCU circuits complete temperature and judged and to the subsequent control process of motor.
Preferably, the IPM power driving circuits include IPM chips, IPM chips are SD20M60AC；MCU chip
23 pin pass through 9 pin of resistance R51 connection IPM chips, 9 pin of electric capacity C43 first ends connection IPM chips, the second end ground connection；MCU
24 pin of chip pass through 13 pin of resistance R52 connection IPM chips, 13 pin of electric capacity C44 first ends connection IPM chips, the second end
Ground connection；20 pin of MCU chip pass through 17 pin of resistance R53 connection IPM chips, the 17 of electric capacity C45 first ends connection IPM chips
Pin, the second end ground connection；17 pin of MCU chip pass through 3 pin of resistance R60 connection IPM chips, electric capacity C51 first ends connection IPM cores
3 pin of piece, the second end ground connection；18 pin of MCU chip pass through 4 pin of resistance R61 connection IPM chips, the connection of electric capacity C52 first ends
4 pin of IPM chips, the second end ground connection；19 pin of MCU chip pass through 5 pin of resistance R62 connection IPM chips, electric capacity C53 first
5 pin of end connection IPM chips, the second end ground connection；24 pin, 25 pin and 26 pin of IPM chips connect the U of DC brushless motor respectively
Phase line, V phase lines and W phase lines.
Preferably, the temperature sensor is thermistor.
Current existing motor temperature control system is usually to use temperature sensor sampling temperature voltage signal, filtered
Processing send MCU to be AD converted into data signal, and data calculating is carried out after then carrying out digital filtering processing through MCU and is compared, is tied
Fruit multilevel iudge goes to make motor corresponding processing；
This programme employs hardware comparator compared with existing motor temperature temperature control technique, and speed responsive faster, is protected
Real-time is demonstrate,proved；Pure hardware collection judges that reliability is higher；Without AD conversion, cost is lower；Process is simple and clear.
The beneficial effect that the utility model is brought is can effectively to protect motor, prevents from going out when motor rotation blockage, load excessive
The situation that existing motor overheating burns.
Brief description of the drawings
Fig. 1 is a kind of structured flowchart of the present utility model；
Fig. 2 and Fig. 3 are a kind of circuit theory diagrams of the present utility model；
In figure：1st, MCU circuits；2nd, IPM power driving circuits；3rd, temperature sensor；4th, low-pass filter circuit；5th, voltage
Comparison circuit；6th, Hall sensor.
Embodiment
Below by embodiment, and with reference to accompanying drawing, the technical solution of the utility model is described in further detail.
Embodiment：A kind of automatic stepless speed-regulating circuit of refrigerant recovering brushless DC motor of the present embodiment, such as Fig. 1
It is shown, including MCU circuits 1, IPM power driving circuits 2, temperature sensor 3, low-pass filter circuit 4 and voltage comparator circuit 5；
The MCU circuits connect the UVW phase lines of the DC brushless motor of coolant reclaiming machine, TEMP by IPM power driving circuits
Device is electrically connected with the input of low-pass filter circuit, and temperature sensor is arranged on the line bag temperature detecting point of DC brushless motor
On；The output end of low-pass filter circuit connects the input of voltage comparator circuit, the output end connection MCU electricity of voltage comparator circuit
Road；MCU circuits are also electrically connected with the Hall sensor 6 of DC brushless motor.
As shown in Figures 2 and 3, low-pass filter circuit includes resistance R39, electric capacity C32 and electric capacity C31, the electric capacity C32's
Positive pole and negative pole connect the two ends of temperature sensor, and electric capacity C32 negative pole is also grounded, and electric capacity C31 and electric capacity C32 are in parallel, resistance
R39 first end connection power supply VCC5V, resistance R39 the second end connection electric capacity C32 positive pole, electric capacity C32 positive pole connection electricity
Press comparison circuit.
Low-pass filter circuit is filtered out because of the measurement error and motor lines bag High-frequency Interference that lead is brought.
Voltage comparator circuit includes comparator U12, resistance R41 and electric capacity C35；The in-phase input end of the comparator U12
Connect normal voltage, inverting input connection electric capacity C32 positive pole, output end connection MCU circuits；Resistance R41 first end connects
Meet power supply VCC5V, resistance R41 the second end connection comparator U12 output end；Electric capacity C35 first end connection comparator U12
Output end, electric capacity C35 the second end ground connection.
Voltage comparator is compared temperature voltage signal with normal voltage, and comparative result is sent into MCU circuits.
MCU circuits include MCU chip, and MCU chip is STM8S903K3；The 13 pin connection comparator U12's of MCU chip is defeated
Go out end；The 6 pin connection power supply VCC5V of MCU chip；Electric capacity C39 first end connects 6 pin of MCU chip, the second end ground connection；Electricity
Hold C40 and electric capacity C39 in parallel；5 pin of MCU chip are grounded by electric capacity C46, and 1 pin is grounded by electric capacity C47, and 4 pin directly connect
Ground；19 pin, 20 pin, 18 pin, 24 pin, 17 pin and the 23 pin connection IPM power driving circuits of MCU chip.
MCU circuits complete temperature and judged and to the subsequent control process of motor.
IPM power driving circuits include IPM chips, and IPM chips are SD20M60AC；23 pin of MCU chip pass through resistance
9 pin of R51 connection IPM chips, electric capacity C43 first ends connect 9 pin of IPM chips, the second end ground connection；24 pin of MCU chip lead to
13 pin of resistance R52 connection IPM chips are crossed, electric capacity C44 first ends connect 13 pin of IPM chips, the second end ground connection；MCU chip
20 pin by 17 pin of resistance R53 connection IPM chips, electric capacity C45 first ends connect 17 pin of IPM chips, the second end ground connection；
17 pin of MCU chip pass through 3 pin of resistance R60 connection IPM chips, 3 pin of electric capacity C51 first ends connection IPM chips, the second end
Ground connection；18 pin of MCU chip connect 4 pin of IPM chips by 4 pin of resistance R61 connection IPM chips, electric capacity C52 first ends,
Second end is grounded；19 pin of MCU chip pass through 5 pin of resistance R62 connection IPM chips, electric capacity C53 first ends connection IPM chips
5 pin, the second end ground connection；24 pin, 25 pin and 26 pin of IPM chips connect the U phase lines, V phase lines and W of DC brushless motor respectively
Phase line.
Temperature sensor is thermistor.
The application process of this circuit is as follows：
First, HVDC brushless electric machine line bag temperature voltage signal is gathered by thermistor；
2nd, by step（One）The line bag temperature voltage signal collected is input to temperature detection comparison circuit, passes through low pass
Filter out because of the measurement error and motor lines bag High-frequency Interference that lead is brought, finally feeding, which compares, detects circuit and given temperature
Scope multilevel iudge is spent, then judged result 5V low and high levels signal feeding MCU；
3rd, step（Two）Gather, filter, the level signal feeding MCU ports obtained by comparison in difference, MCU is through signal
Level state judges whether to be excess temperature or normal, and such as excess temperature MCU is exported and will started to the PWM ripples dutycycle of power driver module
Slow down；
4th, by step（One）, step（Two）, step（Three）Later MCU collections motor hall signal, hall signal passes through
MCU calculates current motor rotating speed, is then compared with given minimum speed, if rotating speed be reached or fallen below to
Fixed minimum speed, motor, which stops slowing down, maintains current rotating speed；
5th, after direct current brushless motor speed has been reached or fallen below given minimum speed, by step（One）, step
Suddenly（Two）, step（Three）, step（Four）It is invalid that the excess temperature signal detected afterwards still will be determined as over-temperature condition MCU；
6th, by step（One）, step（Two）, step（Three）, step（Four）The state of temperature collected is normal temperature
And step（Four）The rotating speed collected is less than given maximum speed, and now MCU will start the PWM ripples duty cycle signals of output
Accelerate；
7th, often accelerate circulation step once（One）、（Two）、（Three）、（Four）, until the rotating speed detected again reach it is given
Maximum speed；
When the compressor load change that motor is driven is big, the electric current of motor can become big, and the temperature of machine winding can rise,
When the motor winding temperature that sensor is detected meets or exceeds the drop rotating speed temperature spot of motor driver setting, driver can be with
The drop rotating speed beat drop rotating speed of setting, such electric current can also decline therewith, realize electric motor temperature reduction.While rotating speed is dropped, driving
Device is also with the beat detection temperature signal of setting, and motor temperature drops to after the normal temperature of driver setting, sensor handle
Temperature signal is transferred to MCU, and MCU judges that temperature is normal, and the beat that motor starts to set with driver again improves rotating speed, until volume
Determine rotating speed.By temperature sensor collecting temperature signal, be transferred to the MCU of driver, MCU is judged, send drop rotating speed or
The instruction of rotating speed is lifted, whole control system realizes running of the motor according to load automatic stepless speed-regulating.Have
This function, can reliably protect motor when motor rotation blockage, load excessive, will not overheat and burn.
Current existing motor temperature control system is usually to use temperature sensor sampling temperature voltage signal, filtered
Processing send MCU to be AD converted into data signal, and data calculating is carried out after then carrying out digital filtering processing through MCU and is compared, is tied
Fruit multilevel iudge goes to make motor corresponding processing；
This programme employs hardware comparator compared with existing motor temperature temperature control technique, and speed responsive faster, is protected
Real-time is demonstrate,proved；Pure hardware collection judges that reliability is higher；Without AD conversion, cost is lower；Process is simple and clear.
Specific embodiment described herein is only to the invention spirit explanation for example.The utility model institute
Category those skilled in the art can make various modifications or supplement or using similar to described specific embodiment
Mode substitute, but without departing from principle of the present utility model or surmount scope defined in appended claims.
Although more used herein MCU, IPM, voltage ratio compared with etc. term, be not precluded from using other terms can
Can property.It is used for the purpose of more easily describing and explaining essence of the present utility model using these terms；It is construed as appointing
A kind of what additional limitation is all disagreed with the invention spirit.
Claims (6)
1. a kind of automatic stepless speed-regulating circuit of refrigerant recovering brushless DC motor, it is characterised in that including MCU circuits,
IPM power driving circuits, temperature sensor, low-pass filter circuit and voltage comparator circuit；The MCU circuits pass through IPM power
The UVW phase lines of the DC brushless motor of drive circuit connection coolant reclaiming machine, the input of temperature sensor and low-pass filter circuit
End electrical connection, temperature sensor is arranged in the line bag temperature detecting point of DC brushless motor；The output end of low-pass filter circuit
Connect the input of voltage comparator circuit, the output end connection MCU circuits of voltage comparator circuit；MCU circuits also with brush DC
The Hall sensor electrical connection of motor.
2. the automatic stepless speed-regulating circuit of refrigerant recovering brushless DC motor according to claim 1, its feature exists
In the low-pass filter circuit includes resistance R39, electric capacity C32 and electric capacity C31, the electric capacity C32 positive pole and negative pole connection temperature
The two ends of sensor are spent, electric capacity C32 negative pole is also grounded, electric capacity C31 and electric capacity C32 are in parallel, resistance R39 first end connection electricity
Source VCC5V, resistance R39 the second end connection electric capacity C32 positive pole, electric capacity C32 positive pole connection voltage comparator circuit.
3. the automatic stepless speed-regulating circuit of refrigerant recovering brushless DC motor according to claim 2, its feature exists
In the voltage comparator circuit includes comparator U12, resistance R41 and electric capacity C35；The in-phase input end of the comparator U12 connects
Connect normal voltage, inverting input connection electric capacity C32 positive pole, output end connection MCU circuits；Resistance R41 first end connection
Power supply VCC5V, resistance R41 the second end connection comparator U12 output end；Electric capacity C35 first end connection comparator U12's
Output end, electric capacity C35 the second end ground connection.
4. the automatic stepless speed-regulating circuit of refrigerant recovering brushless DC motor according to claim 3, its feature exists
In the MCU circuits include MCU chip, and MCU chip is STM8S903K3；The 13 pin connection comparator U12's of MCU chip is defeated
Go out end；The 6 pin connection power supply VCC5V of MCU chip；Electric capacity C39 first end connects 6 pin of MCU chip, the second end ground connection；Electricity
Hold C40 and electric capacity C39 in parallel；5 pin of MCU chip are grounded by electric capacity C46, and 1 pin is grounded by electric capacity C47, and 4 pin directly connect
Ground；19 pin, 20 pin, 18 pin, 24 pin, 17 pin and the 23 pin connection IPM power driving circuits of MCU chip.
5. the automatic stepless speed-regulating circuit of refrigerant recovering brushless DC motor according to claim 4, its feature exists
In the IPM power driving circuits include IPM chips, and IPM chips are SD20M60AC；23 pin of MCU chip pass through resistance R51
9 pin of IPM chips are connected, electric capacity C43 first ends connect 9 pin of IPM chips, the second end ground connection；24 pin of MCU chip pass through electricity
13 pin of R52 connection IPM chips are hindered, electric capacity C44 first ends connect 13 pin of IPM chips, the second end ground connection；The 20 of MCU chip
Pin passes through 17 pin of resistance R53 connection IPM chips, 17 pin of electric capacity C45 first ends connection IPM chips, the second end ground connection；MCU
17 pin of chip pass through 3 pin of resistance R60 connection IPM chips, 3 pin of electric capacity C51 first ends connection IPM chips, the second termination
Ground；18 pin of MCU chip are by 4 pin of resistance R61 connection IPM chips, and electric capacity C52 first ends connect 4 pin of IPM chips, the
Two ends are grounded；19 pin of MCU chip pass through 5 pin of resistance R62 connection IPM chips, the 5 of electric capacity C53 first ends connection IPM chips
Pin, the second end ground connection；24 pin, 25 pin and 26 pin of IPM chips connect the U phase lines, V phase lines and W phases of DC brushless motor respectively
Line.
6. the automatic stepless speed-regulating circuit of refrigerant recovering brushless DC motor according to claim 1 or 2, its feature
It is, the temperature sensor is thermistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720093761.5U CN206432922U (en) | 2017-01-24 | 2017-01-24 | The automatic stepless speed-regulating circuit of refrigerant recovering brushless DC motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720093761.5U CN206432922U (en) | 2017-01-24 | 2017-01-24 | The automatic stepless speed-regulating circuit of refrigerant recovering brushless DC motor |
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| CN206432922U true CN206432922U (en) | 2017-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720093761.5U Active CN206432922U (en) | 2017-01-24 | 2017-01-24 | The automatic stepless speed-regulating circuit of refrigerant recovering brushless DC motor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947648A (en) * | 2017-12-19 | 2018-04-20 | 深圳市创科维信电子有限公司 | A kind of three-phase brushless motor drive circuit and its control method |
| CN112796944A (en) * | 2021-03-26 | 2021-05-14 | 中国华能集团清洁能源技术研究院有限公司 | Cooling method, system and equipment for wind generating set |
-
2017
- 2017-01-24 CN CN201720093761.5U patent/CN206432922U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107947648A (en) * | 2017-12-19 | 2018-04-20 | 深圳市创科维信电子有限公司 | A kind of three-phase brushless motor drive circuit and its control method |
| CN107947648B (en) * | 2017-12-19 | 2024-02-20 | 深圳市创科维信电子有限公司 | Three-phase brushless motor driving circuit and control method thereof |
| CN112796944A (en) * | 2021-03-26 | 2021-05-14 | 中国华能集团清洁能源技术研究院有限公司 | Cooling method, system and equipment for wind generating set |
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