CN2310189Y - Brushless dc motor air extracting pump - Google Patents
Brushless dc motor air extracting pump Download PDFInfo
- Publication number
- CN2310189Y CN2310189Y CN98206115U CN98206115U CN2310189Y CN 2310189 Y CN2310189 Y CN 2310189Y CN 98206115 U CN98206115 U CN 98206115U CN 98206115 U CN98206115 U CN 98206115U CN 2310189 Y CN2310189 Y CN 2310189Y
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- China
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- motor
- brshless
- air extracting
- direct current
- brushless direct
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Abstract
The utility model relates to an air extracting device in an environmental protection sampling apparatus, comprising a pump body of an air extracting pump and a motor. The air extracting device in an environmental protection sampling apparatus is characterized in that a brushless direct current motor is adopted by the motor (2). The brushless direct current motor (2) and the pump body (1) are connected by a rotary shaft. A drive and control circuit board (6) is also arranged on the brushless direct current motor. Due to the fact that the brushless direct current motor is adopted by the air extracting device in an environmental protection sampling apparatus to substitute for an alternate current series excited motor in the existing air extracting pump, the utility model has the advantages of long service life, low noise, no maintenance, good humidity resistance, wide flow adjusting range, high adjusting quality, etc.
Description
The utility model relates to the air extractor in a kind of environmental protection sampling instrument.
At present the component environment protection sampling instrument (as mass flow air total suspended particles sampler, middle flow air total suspended particles sampler etc.) that uses of China requires that sampling flow is big, negative pressure is high, all adopts at a high speed to exchange series excited machine (rotating speed is greater than 15000 rev/mins) as the extraction pump power plant.Because this kind motor is realized the electric current commutation by carbon brush, thus the life-span short (about 2000 hours), during operation noise big, spark, maintenance inconvenience (worked about 500 hours, and must change carbon brush) arranged.
Above-mentioned instrument in use requires the sampling of constant current amount, all is at present to adopt bleeding regulating pump motor voltage method, makes its rotation speed change reach constant flow.And AC motor variable voltage control narrow range, motor speed instability in the speed regulation process, moment variations are big, cause flowed fluctuation big, so regulation quality is low.
This quasi-instrument is opening type structure, moisture-sensitive, fragile throughout the year at outside work and exchange series excited machine simultaneously.
The purpose of this utility model is to overcome above-mentioned existing technical disadvantages, provide a kind of life-span long, noise is little, non-maintaining, humidity resistance good, flow adjustment range is wide, the air extractor in the high environmental protection sampling instrument of regulation quality.
Brshless DC motor extraction pump of the present utility model comprises the pump housing, motor, it is characterized in that: motor adopts brshless DC motor, brshless DC motor 2 and the pump housing 1 link to each other by rotating shaft, also are provided with the circuit that the drive controlling brshless DC motor rotates on brshless DC motor.Compared with prior art, inventive point of the present utility model is to have replaced interchange series excited machine in the existing extraction pump with brshless DC motor, and its mechanical structure is basic identical, but has designed corresponding driving and control circuit board 6 for brshless DC motor.This motor is made of stator iron core, staor winding, p-m rotor, rotor-position sensor etc., and rotating speed is greater than 18000 rev/mins.The Drive and Control Circuit of motor can realize the motor stepless time adjustment, and do not use special velocity transducer, utilizes the signal of rotor-position sensor to form Closed-Loop Speed Governing System.Simultaneously, the circuit board that the drive controlling brshless DC motor is turned round is put into and adopts the method for plastic capsulation to combine together in this motor.Such scheme, motor do not have brush, former life-span to grow (greater than 9000 hours), no-spark, noise is little, non-maintaining owing to adopted.This motor has the direct current generator characteristic simultaneously, can realize the stepless time adjustment running easily.And stabilization of speed during speed governing.The environmental protection sampling instrument flow adjustment range that has disposed this air extractor is wide, regulation quality is high thereby make.
Owing to adopted such scheme, the stator coil of motor and the electronic component of Drive and Control Circuit do not contact fully with air, and the corrosion protection humidity resistance is good, and compact overall structure is simple, and is easy to use.
Below in conjunction with accompanying drawing the utility model brshless DC motor extraction pump is further described.
Fig. 1 is external form of the present utility model and structural representation, also can be used as an embodiment.
1. extraction pumps, 2. brshless DC motors, 3. brushless DC motor rotors, 4. bearings among the figure
5. rotor-position sensor 6. drives and control circuit board 7. brushless DC motor stators and coil
8. impeller tightening nut 9. inducers 10. impellers
As shown in Figure 1, this device is divided into two-part up and down, and top is extraction pump, by impeller tightening nut 8, and inducer 9, impeller 10 is formed.The bottom is brshless DC motor and Drive and Control Circuit plate, by brushless DC motor rotor 3, and bearing 4, rotor-position sensor 5 drives and control circuit board 6, and brushless DC motor stator and coil 7 are formed.Two parts directly connect, and promptly brshless DC motor directly drives extraction pump.The air-flow that motor rotates back, impeller 10 discharges enters inducer 9, under the effect of inducer, makes air communication cross the effect that motor case plays the cooling brshless DC motor.The recovery section airflow kinetic energy is converted into the negative pressure energy, thereby has finished the air extractor working procedure simultaneously.
Fig. 2 is a brshless DC motor drive controlling functional-block diagram, and Fig. 3 is the physical circuit figure of Fig. 2.
11 is brushless direct current motor controller MC33035 among Fig. 2,3, and its function is a) to realize motor rotor position decoding, b) produces pulse-width signal, and c) high-power V metal-oxide-semiconductor in the direct external motor-drive circuit of energy d) is realized overcurrent protection.12 is FIT Frequency Generator MC33039, can produce frequency signal, 13 is motor-drive circuit MPM3003, is made up of the high-power V metal-oxide-semiconductor, 14 is integration circuit, be made up of resistance and electric capacity, 15 are made up of potentiometer for speed given circuit, and 16 is current sensor, form by resistance, 5 is the brushless DC motor rotor position transducer, is made up of Hall integrated circuit, and 7 is brushless DC motor stator and coil.
As shown in Figure 2, driving and control circuit board 6 are made up of brushless direct current motor controller 11, integration circuit 14, FIT Frequency Generator 12, rotor-position sensor 5, current sensor 16, motor-drive circuit 13, speed given circuit 15 etc.
As shown in Figure 3, the signal of rotor-position sensor 5 is sent into brushless direct current motor controller 11, after brushless direct current motor controller 11 inner decoder for decoding, can determine the motor rotor position of controlling, also just determined which VMOS pipe conducting in the motor-drive circuit 13.The motor stator winding two ends that are connected with this VMOS pipe obtain voltage, and motor just can rotate.
Speed given circuit 15 output signals are also sent into brushless direct current motor controller 11.This signal input has determined the pulse width of the pulse-width signal that brushless direct current motor controller 11 produces, determined promptly in the motor-drive circuit 13 that the VMOS pipe of conducting is opened dutycycle, also just determined simultaneously to be connected coil of stator of motor both end voltage value, thereby determined rotating speed of motor with this VMOS pipe.
In sum, after the signal of rotor-position sensor 5 and speed given circuit 15 is sent into brushless direct current motor controller 11, brushless direct current motor controller 11 produces output signal and delivers to motor-drive circuit 13, the conducting of VMOS pipe makes brshless DC motor rotate with certain speed in the control motor-drive circuit 13.Change speed given circuit 15 output signal values, can realize this brushless electric machine stepless time adjustment.
As shown in Figure 3, the signal of rotor-position sensor 5 is sent into FIT Frequency Generator 12 simultaneously, FIT Frequency Generator 12 produces output signal, this signal pulsewidth is certain, frequency changes with the signal that rotor-position sensor 5 produces, the output signal of FIT Frequency Generator 12 forms the motor speed reverse feedback through sending into brushless direct current motor controller 11 behind the integration circuit 14, has realized the brshless DC motor closed loop control, makes motor speed more stable.
As shown in Figure 3, current sensor 8 is serially connected in the motor stator loop, and when the electric current that flows through current sensor 8 surpassed the rated current of motor, brushless direct current motor controller 11 made VMOS shutoff in the motor-drive circuit 13 according to the signal of current sensor 8.Realized the overcurrent protection of motor.
This circuit can be used as the embodiment of brshless DC motor Drive and Control Circuit.The dc brushless motor staor winding of being controlled should be three phase windings, and rotor-position sensor should be three.Fig. 2, driving and control circuit shown in Figure 3 only are embodiments, adopt the control circuit of similar brshless DC motor also should belong to scope of design of the present utility model.
Claims (2)
1. brshless DC motor extraction pump, comprise the extraction pump pump housing, motor, it is characterized in that: motor (2) adopts brshless DC motor, and brshless DC motor (2) links to each other by rotating shaft with the pump housing (1), also is provided with to drive and control circuit board (6) on brshless DC motor.
2. brshless DC motor extraction pump according to claim 1 is characterized in that: driving and control circuit board (6) are made up of brushless direct current motor controller MC33035 (11), integration circuit (14), FIT Frequency Generator MC33039 (12), rotor-position sensor (5), current sensor (16), high-power V metal-oxide-semiconductor MPM3003 (13), speed given circuit (15) etc.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98206115U CN2310189Y (en) | 1998-06-23 | 1998-06-23 | Brushless dc motor air extracting pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98206115U CN2310189Y (en) | 1998-06-23 | 1998-06-23 | Brushless dc motor air extracting pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2310189Y true CN2310189Y (en) | 1999-03-10 |
Family
ID=33962354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN98206115U Expired - Fee Related CN2310189Y (en) | 1998-06-23 | 1998-06-23 | Brushless dc motor air extracting pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2310189Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112697976A (en) * | 2020-12-18 | 2021-04-23 | 汉威科技集团股份有限公司 | Gas path flow real-time dynamic adjusting method, system and storage medium |
-
1998
- 1998-06-23 CN CN98206115U patent/CN2310189Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112697976A (en) * | 2020-12-18 | 2021-04-23 | 汉威科技集团股份有限公司 | Gas path flow real-time dynamic adjusting method, system and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C57 | Notification of unclear or unknown address | ||
| DD01 | Delivery of document by public notice |
Addressee: Liu Xuewei Document name: Notification of Termination of Patent Right |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |