CN107769632A - A kind of brushless dc tachometer - Google Patents
A kind of brushless dc tachometer Download PDFInfo
- Publication number
- CN107769632A CN107769632A CN201711172314.XA CN201711172314A CN107769632A CN 107769632 A CN107769632 A CN 107769632A CN 201711172314 A CN201711172314 A CN 201711172314A CN 107769632 A CN107769632 A CN 107769632A
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- CN
- China
- Prior art keywords
- motor
- brshless
- low
- pass filter
- brushless
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/17—Circuit arrangements for detecting position and for generating speed information
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a kind of brushless dc tachometer, the device is connected with each other by dc source, buck circuit, low-pass filter circuit, voltmeter and brshless DC motor PWM wave producers forms successively.Wherein, the dc source output connects the buck circuit input, the buck circuit output connects the low-pass filter circuit input, the low-pass filter circuit output connects the voltmeter input, and the brshless DC motor PWM wave producers output is connected to the base stage input of triode in the buck circuit.Disclosed device of the present invention solves the inconvenience brought by sensor to brshless DC motor Rotating speed measring, can be realized with a low cost the accurate detection of brshless DC motor rotating speed.
Description
Technical field
The invention belongs to brshless DC motor technical field, and in particular to a kind of brushless dc tachometer.
Background technology
Brshless DC motor is widely used in recent years, and it has control simple, efficiency high, good speed adjustment features, defeated
Go out the features such as torque is big.In robot, space flight and aviation, precision electronic device and equipment etc. to motor performance, control accuracy requirement
Higher occasion and field, the application and research of brshless DC motor receive extensive attention.As brshless DC motor should
Continuous development, Control System Design of the people to motor requires more and more higher, in order to realize velocity close-loop control, it is necessary to survey
Go out motor speed size.
Detection motor speed method have a lot, according to detection used by operation principle be commonly divided into three kinds：Simulation
Formula, synchronous mode and counter.Brshless DC motor is divided into two classes again：The brshless DC motor of position sensor and without position pass
The brshless DC motor of sensor.Due to capacity all very littles of most brshless DC motors, it should not typically install on axle and such as test the speed
The speed measuring device such as motor or photoelectric coded disk, for this, researcher proposes many methods to obtain brshless DC motor indirectly
Rotary speed information, but various schemes all have advantage and disadvantage, are not to be applied to all motors, it is therefore necessary to brushless direct-current
The detection method of motor speed carries out induction and conclusion, finds a kind of new safety without sensor, the rotating speed inspection of reliable low cost
Survey method.
The content of the invention
It is an object of the invention to solve at least the above, and provide the advantages of at least will be described later.
It is contemplated that using extra speed probe for brshless DC motor Rotating speed measring, accuracy low cost is high
A kind of problem, there is provided inexpensive speed detector avoided using additional sensors.
In order to realize according to object of the present invention and further advantage, there is provided a kind of brshless DC motor Rotating speed measring
Device, including：Including dc source, buck circuit, low-pass filter circuit, voltmeter and brshless DC motor PWM ripples
Generator；Wherein, the dc source output connects the buck circuit input, the buck circuit output connection
The low-pass filter circuit input, the low-pass filter circuit output connect the voltmeter input, the brshless DC motor
The output of PWM wave producers is connected to the base stage input of triode in the buck circuit.
Preferably, the buck circuit is made up of triode V1, diode D1, inductance L1 and electric capacity C1, described low
Bandpass filter circuit is connected to the electric capacity C1 both ends.
Preferably, the low-pass filter circuit is in series by resistance R1 and electric capacity C2, and the resistance of the resistance R1
Value and electric capacity C2 capacitance export PWM frequency according to the brshless DC motor PWM wave producers and determined.
Preferably, the brshless DC motor PWM wave producers select the PWM ripples for carrying out speed governing to control object motor to send out
Raw device, the i.e. detection means share a PWM ripple with control object motor, by detection means output voltage values and control object electricity
Machine tachometer value associates.
The present invention comprises at least following beneficial effect：
1st, the brushless dc tachometer that the present invention uses, simple in construction, cost is low, practical；
2nd, in the case of without using extra speed probe, dexterously by tach signal and device output end voltage value phase
Contact, reduces testing cost.
Further advantage, target and the feature of the present invention embodies part by following explanation, and part will also be by this
The research and practice of invention and be understood by the person skilled in the art.
Brief description of the drawings
Fig. 1 is the structural representation of the brushless dc tachometer of the specific embodiment of the invention；
Fig. 2 is that the voltage of the brushless dc tachometer of the specific embodiment of the invention indicates schematic diagram；
Fig. 3 is that the rotating speed of the brushless dc tachometer of the specific embodiment of the invention indicates schematic diagram.
Embodiment
The present invention is described in further detail below in conjunction with the accompanying drawings, to make those skilled in the art with reference to specification text
Word can be implemented according to this.
It should be appreciated that such as " having ", "comprising" and " comprising " term used herein do not allot one or more
The presence or addition of individual other elements or its combination.
The present invention provides a kind of brushless dc tachometer, and as Figure 1-3, Fig. 1 is the nothing of the present embodiment
The structural representation of brushless motor speed detector, as shown in figure 1, the detection means includes dc source 1, decompression successively
Chopper circuit 2, low-pass filter circuit 3, voltmeter 4 and brshless DC motor PWM wave producers 5.Wherein, the dc source 1
Output connects the buck circuit 2 and inputted, and the output of buck circuit 2 connects the low-pass filter circuit 3 and inputted,
The output of low-pass filter circuit 3 connects the voltmeter 4 and inputted, the output of brshless DC motor PWM wave producers 5 connection
The triode V1 base stage input into the buck circuit 3.
Further, the buck circuit 2 is connected with each other by triode V1, diode D1, inductance L1 and electric capacity C1
Form.
Further, the low-pass filter circuit 3 is in series by resistance R1 and electric capacity C2, and it act as further filtering out
The chopping signal of buck circuit output, and the selection of resistance R1 and electric capacity C2 values need to be according to the brshless DC motor
PWM wave producers 5 export PWM frequency and determined.
Further, the brshless DC motor PWM wave producers 5 are directly selected and control object propulsion electric machine are adjusted
The PWM wave producers of speed, the i.e. detection means share a PWM ripple with control object motor, by the magnitude of voltage at electric capacity C2 both ends
Associated with control object motor speed value.
The brushless dc tachometer of the present embodiment, simple in construction, cost is low, practical.Without using
In the case of extra speed probe, dexterously tach signal is associated with device output end voltage signal, substantially increased
The accuracy of Rotating speed measring, reduce the cost of Rotating speed measring.
Further details of theory is carried out with reference to the indicating section of Fig. 2-3 pairs of brushless dc tachometers
It is bright.
Fig. 3 is that the rotating speed of the brushless dc tachometer of the present embodiment indicates schematic diagram, as shown in Fig. 2 electric
Meter-pressing amount journey arrives 5V for 0, and the rotating speed of corresponding brshless DC motor is 0 to 100 turns per minute.When the pointer of voltmeter 4 points to 0,
The rotating speed of corresponding brshless DC motor is 0；When voltage list index points to 1, the rotating speed of corresponding brshless DC motor is per minute
20 turns, by that analogy, when voltage list index points to 5, the rotating speed of corresponding brshless DC motor is 100 turns per minute.
Although embodiment of the present invention is disclosed as above, it is not restricted in specification and embodiment listed
With it can be applied to various suitable the field of the invention completely, can be easily for those skilled in the art
Other modification is realized, therefore under the universal limited without departing substantially from claim and equivalency range, it is of the invention and unlimited
In specific details and shown here as the legend with description.
Claims (4)
1. a kind of brushless dc tachometer, it is characterised in that including dc source, buck circuit, low pass
Filter circuit, voltmeter and brshless DC motor PWM wave producers；Wherein, the dc source output connects the decompression
Chopper circuit inputs, and the buck circuit output connects the low-pass filter circuit input, and the low-pass filter circuit is defeated
Go out to connect the voltmeter input, the brshless DC motor PWM wave producers output is connected in the buck circuit
The base stage input of triode.
2. brushless dc tachometer as claimed in claim 1, it is characterised in that the buck circuit by
Triode V1, diode D1, inductance L1 and electric capacity C1 compositions, the low-pass filter circuit are connected to the electric capacity C1 both ends.
3. brushless dc tachometer as claimed in claim 2, it is characterised in that the low-pass filter circuit by
Resistance R1 and electric capacity C2 are in series, and the resistance value of the resistance R1 and electric capacity C2 capacitance are according to the brushless direct-current
Motor PWM wave producer output PWM frequency determines.
4. brushless dc tachometer as claimed in claim 3, it is characterised in that the brshless DC motor
PWM wave producers select the PWM wave producers that speed governing is carried out to control object motor, the i.e. detection means and control object motor
A PWM ripple is shared, detection means output voltage values are associated with control object motor speed value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711172314.XA CN107769632A (en) | 2017-11-22 | 2017-11-22 | A kind of brushless dc tachometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711172314.XA CN107769632A (en) | 2017-11-22 | 2017-11-22 | A kind of brushless dc tachometer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107769632A true CN107769632A (en) | 2018-03-06 |
Family
ID=61279307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711172314.XA Withdrawn CN107769632A (en) | 2017-11-22 | 2017-11-22 | A kind of brushless dc tachometer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107769632A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11127589A (en) * | 1998-08-26 | 1999-05-11 | Hitachi Ltd | Speed control device for motor |
| CN1490191A (en) * | 2003-08-15 | 2004-04-21 | 南京金陵紫光系统工程有限公司 | Assembled instrument step motor controller of vehicle and control mode thereof |
| CN107389969A (en) * | 2017-07-31 | 2017-11-24 | 苏州华亚智能科技股份有限公司 | A kind of brushless dc tachometer |
-
2017
- 2017-11-22 CN CN201711172314.XA patent/CN107769632A/en not_active Withdrawn
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11127589A (en) * | 1998-08-26 | 1999-05-11 | Hitachi Ltd | Speed control device for motor |
| CN1490191A (en) * | 2003-08-15 | 2004-04-21 | 南京金陵紫光系统工程有限公司 | Assembled instrument step motor controller of vehicle and control mode thereof |
| CN107389969A (en) * | 2017-07-31 | 2017-11-24 | 苏州华亚智能科技股份有限公司 | A kind of brushless dc tachometer |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20180306 |
|
| WW01 | Invention patent application withdrawn after publication |